OMB APPROVAL OMB Number: 3235-0570 Expires: August 31, 2010 Estimated average burden hours per response.....18.9 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSR CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES 		Investment Company Act file number 811-21569 Pioneer Ibbotson Asset Allocation Series (Exact name of registrant as specified in charter) 60 State Street, Boston, MA 02109 (Address of principal executive offices) (ZIP code) Dorothy E. Bourassa, Pioneer Investment Management, Inc., 60 State Street, Boston, MA 02109 (Name and address of agent for service) Registrant's telephone number, including area code: (617) 742-7825 Date of fiscal year end: July 31 Date of reporting period: August 1, 2008 through July 31, 2008 Form N-CSR is to be used by management investment companies to file reports with the Commission not later than 10 days after the transmission to stockholders of any report that is required to be transmitted to stockholders under Rule 30e-1 under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may use the information provided on Form N-CSR in its regulatory, disclosure review, inspection, and policymaking roles. A registrant is required to disclose the information specified by Form N-CSR, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-CSR unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. ss. 3507. ITEM 1. REPORTS TO SHAREOWNERS. [IMAGE] Pioneer Ibbotson Asset Allocation Series - -------------------------------------------------------------------------------- Annual Report | July 31, 2008 - -------------------------------------------------------------------------------- Ticker Symbols: Conservative Moderate Growth Aggressive Allocation Allocation Allocation Allocation Class Fund Fund Fund Fund - ----- ---- ---- ---- ---- A PIAVX PIALX GRAAX PIAAX B PIBVX PIBLX GRABX IALBX C PICVX PIDCX GRACX IALCX Y IBBCX IMOYX IBGYX IBAYX [LOGO] Pioneer Investments(R) visit us: pioneerinvestments.com Table of Contents Letter to Shareowners 2 Market Overview and Outlook 4 Comparing Ongoing Fund Expenses 8 Portfolio Reviews 16 Prices and Distributions 18 Portfolio Summary & Performance Update 20 Schedule of Investments 40 Financial Statements 44 Notes to Financial Statements 66 Report of Independent Registered Public Accounting Firm 73 Approval of Investment Advisory Agreement 83 Trustees, Officers and Service Providers 99 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 1 President's Letter Dear Shareowner, Staying diversified and keeping your portfolio invested in the markets are two general investment principles that have served investors well over time. They are particularly useful guides to keep in mind today, at a time when markets around the globe are being buffeted by problems in the financial and real estate industries and by concerns about a slowing economy. After an extended period of steady economic growth with sustained low unemployment and low inflation, the U.S. economy ran into difficulty as 2007 drew to a close. Investors in subprime mortgages were forced to mark down the value of their assets, imperiling leveraged balance sheets. The ensuing credit crunch forced central banks in the United States and Europe to assume the role of "lender of last resort" to keep credit markets functioning. Conditions worsened in the first quarter of 2008, as falling prices, margin calls and deleveraging continued and the auction-rate preferred market seized up. By then, recession talk was widespread as concern grew that falling home prices, rising unemployment, and disruptions in financial markets posed a significant threat to economic growth. In the second quarter of 2008, oil prices increased from roughly $100 to nearly $150, and commodities nearly pushed real estate to second place in the "wall of worry" confronting investors. Markets reacted poorly to these developments. Treasury bond prices rose as the market underwent a classic "flight to quality" during the period, leading up to the near failure of Bear Stearns, but almost have returned to start-of-year levels. Fixed-income credit spreads (the difference in rates between corporate and U.S. government bonds) widened dramatically, and stock markets fell. In the 12-month period ending July 31, 2008, the Dow Jones Industrial Average fell 12%, the Standard & Poor's 500 Index fell 11% and the NASDAQ Composite Index fell 9%. The MSCI EAFE Developed Market Index of international stock markets fell 12%, and the MSCI Emerging Markets Index fell 4% during the same period. The U.S. investment-grade bond market, as measured by the Lehman Brothers Aggregate Bond Index, returned 6% over the 12-month period, while the U.S. high-yield bond market, as measured by the Merrill Lynch High Yield Bond Master II Index, fell 1% as the price declines associated with widening of credit spreads more than offset the lower-quality bonds' higher-coupon income. 2 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 While markets have been volatile, economic fundamentals may have turned the corner. Economic growth bottomed in the fourth quarter of 2007 and has accelerated in each of the first two quarters of 2008. Oil prices have fallen more than 10% from their mid-July peak, and many other commodity prices have softened. Home sales are showing signs of recovering. A recession, although unlikely given strong export markets and relatively low inventory levels in the economy, still is a possibility, given the weakened financial state of the U.S. consumer and the difficulty obtaining credit throughout the United States. Regardless of the exact outcome, we expect growth overall to be muted. On the other hand, the cheap U.S. dollar and substantial fiscal and monetary stimulus are potent supports for the economy. Markets remain volatile, and falling risk tolerances and deleveraging may depress asset prices in the short term, but equity and corporate bond valuations look attractive over a longer time horizon. Sudden swings in the markets are always to be expected, but they are difficult to time. Maintaining a long-term time horizon, being diversified, and paying attention to asset allocation are important investment principles. As always, we encourage you to work closely with your financial advisor to find the mix of stocks, bonds and money market assets that is best aligned to your particular risk tolerance and investment objective and to adhere to a strategic plan rather than letting emotions drive investment decisions. /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA Inc. Any information in this shareowner report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of the opinion of Fund management as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 3 Market Overview and Outlook | 7/31/08 In the following interview, portfolio manager Peng Chen, Chief Investment Officer for Ibbotson Associates, discusses the market environment and investment strategies that applied to the Portfolios in Pioneer Ibbotson Asset Allocation Series for the fiscal year ended July 31, 2008. Q Could you characterize the economic and market backdrop during the 12 months ended July 31, 2008? A The subprime mortgage crisis caused significant volatility across global markets as the period opened. Credit tightened and liquidity disappeared as investors sought to protect themselves against risks that were difficult to evaluate. Ultimately, the risk aversion led to a flight to quality, which was most strongly evidenced by high demand for U.S. Treasury securities during the period. The bond markets began to price in Federal Reserve easing of short-term rates, causing rates to fall and the yield curve to steepen significantly. (The yield curve depicts the relationship between bond prices and varying maturities.) In September, October and December of 2007, the Fed lowered the benchmark short-term rate in total by one percentage point to 4.25%. Entering 2008, the U.S. economy appeared to be on the brink of recession, driven by a deep correction in housing. Fallout from the subprime mortgage crisis was ongoing, and for most of the first quarter of 2008, the markets saw a continued flight to quality that benefited U.S. Treasury securities at the expense of most other asset classes. In mid-March, the near collapse of Bear Stearns, a leading investment bank, led the Fed to take decisive actions to restore liquidity to the financial system, including the opening up of its discount window to investment banks. This event marked something of a turning point, as market participants began to focus on fundamentals again rather than almost exclusively on risk avoidance. As a result, interest rates rose on the Treasury yield curve, stocks stabilized to a degree and credit-oriented sectors outperformed, as exemplified by high-yield bond returns in the 4% range for April. Between January 22 and April 30, the Fed lowered its benchmark interest rate four times, dropping the Fed funds rate another two and one-quarter percentage points to its current 2.00%. Late in the period, an alarming rise in the price of oil reawakened inflation fears at a time when the economy was listless. The spike in oil was accompanied by the Fed signaling an end to its campaign of rate easing with its April 30 rate cut, leading to a renewed flight to quality. Interest rates ended the period lower. Since a bond's price moves in the opposite direction of its yield, this meant that bond prices generally rose 4 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 over the period. While rates fell to a more modest degree on longer maturities, prices of these issues benefited from their greater interest rate sensitivity. The overall bond market returned 6.15% for the 12 months as gauged by the Lehman Brothers Aggregate Bond Index, with higher quality sectors providing the best performance. The U.S. equity market in aggregate provided poor returns for the same period as reflected in the S&P 500 return of -11.09%, with large-cap and value-oriented stocks lagging small-cap and growth. International equities fell along with the domestic stock market, with the MSCI EAFE Index returning -11.73% for the 12 months ended July 31, 2008. Q What were the strategic considerations that you applied to the four Portfolios in allocating assets during the period? A For each Portfolio, assets were invested during the period in keeping with their broad asset allocation and specific mutual fund targets. In addition, we have implemented several tactical shifts across all the Portfolios. Within the equity portion of each Portfolio, as we entered the period, the Portfolios continued to overweight U.S. large-capitalization stocks relative to U.S. small-cap stocks. An important consideration in maintaining this weighting was our view that large caps had the potential to outperform as the market anticipated a recession, as large-cap stocks have often been more resilient under that scenario. In addition, the tight credit environment at the beginning of the period seemed to favor large, cash-rich companies. Late in the period, with a recession for all intents and purposes underway, the Portfolios began to add small-cap exposure and move to a neutral posture as small caps are often the first to look ahead to the prospect of economic recovery. While the weighting toward large caps was positive for performance early in the period, the advantage was trimmed late in the period as the segment suffered in the wake of the oil price spike. Late in the period, we introduced a gradual overweighting of equities, as we viewed valuations as attractive, especially in relation to Treasury yields. In addition, the overall stock market can be expected at some point to look ahead to economic recovery. Within the bond portion of each Portfolio, the Portfolios initially underweighted long-term bonds, with the difference allocated to shorter-term fixed-income alternatives. The weighting was designed to limit volatility but constrained performance as longer-term issues benefited most from the flight to quality and falling interest rates. Toward the middle of the period, the Portfolios phased out this positioning, as a steeper yield curve made long-term rates more attractive on a relative basis. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 5 The difference in yield offered by high yield bonds versus investment-grade issues was below its long-term average for much of the period, and the Portfolios moved to underweight the high-yield bond offering in favor of equities and investment-grade bonds. While high-yield bonds indeed lagged investment-grade issues as the period progressed, the positive impact of the underweighting was negated as equities overseas encountered weakness and financial stocks dragged down equity returns in the United States, with the exception of energy stocks. In March, high yield differentials reached more attractive levels and the Portfolios moved to a neutral weighting. As a result of our shift toward equities late in the period, fixed-income holdings are currently underweighted in the Portfolios. Finally, the Portfolios remained underweight in REITs (Real Estate Investment Trusts) in favor of equities during the period. This modestly constrained performance for the year, as REITs declined less than most other equity categories. We continue to underweight REITs in view of our risk/reward assessment of the asset class. While valuations have retreated from the extremes of the fairly recent past, REITs continue to trade above their long-term valuation averages. In addition, recent press reports of increasing vacancy rates lead us to expect earnings deterioration for the sector. Q What factors are you watching most closely as you determine strategy for the Portfolios going forward? A The U.S. economy is at a minimum experiencing a significant slowdown and may be in recession. In addition, the housing market is likely to remain weak for several quarters to come, limiting residential investment and purchases of durable goods such as refrigerators. High energy and food prices are weighing on the consumer as well, and are a primary concern in all major economies. The consensus for growth in industrialized economies outside the United States is for modest but positive growth in 2008. The more extreme views of the U.S. economy have it headed into a period of both slow growth and high inflation. We do not, however, believe that a resurgence in inflation is likely, given the impact on wages of international competition and a weak employment market. With respect to growth, exports have become increasingly significant, and we expect U.S. firms to continue to take advantage of the weak dollar to find new customers abroad. Going forward, we will continue to monitor economic indicators and interest rates to evaluate whether we need to adjust the views underlying our strategic allocations. The Fund's performance depends on the adviser's skill in determining the strategic asset class allocations, the mix of underlying Pioneer funds, as well as the performance of those underlying funds. The underlying funds' performance may 6 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 be lower than the performance of the asset class that they were selected to represent. Stocks and bonds can decline due to adverse issuer, market, regulatory, or economic developments. International markets may be less liquid and can be more volatile than U.S. markets. These risk factors, including those associated with currency exchange rates, also apply to investments in international markets, all of which make international markets more volatile and less liquid than investments in domestic markets. Some of the underlying funds can invest in either high-yield securities or small/emerging growth companies. Investments in these types of securities generally are subject to greater volatility than either higher-grade securities or more-established companies, respectively. Before making an investment in any portfolio, you should consider all the risks associated with it. Please see the Portfolio Reviews beginning on page 16 for information on specific weightings and performance for each of the four portfolios in the Pioneer Ibbotson Asset Allocation Series. Any information in this shareowner report regarding market or economic trends or the factors influencing each portfolios' historical or future performance are statements of the opinion of the portfolio's management as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 7 Comparing Ongoing Fund Expenses Pioneer Ibbotson Conservative Allocation Fund As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables - -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value [divided by] $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Conservative Allocation Fund Based on actual returns from February 1, 2008 through July 31, 2008. - ------------------------------------------------------------------------------------- Share Class A B C Y - ------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/08 - ------------------------------------------------------------------------------------- Ending Account Value $969.45 $966.28 $966.31 $967.74 (after expenses) on 7/31/08 - ------------------------------------------------------------------------------------- Expenses Paid $6.81 $11.20 $10.95 $9.00 During Period* - ------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.39%, 2.29%, 2.24% and 1.84% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 182/366 (to reflect the partial year period) to calculate the "Expenses Paid During Period" in the table above. 8 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Conservative Allocation Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from February 1, 2008 through July 31, 2008. - ------------------------------------------------------------------------------------- Share Class A B C Y - ------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/08 - ------------------------------------------------------------------------------------- Ending Account Value $1,017.95 $1,013.48 $1,013.72 $1,015.71 (after expenses) on 7/31/08 - ------------------------------------------------------------------------------------- Expenses Paid $6.97 $11.46 $11.22 $9.22 During Period* - ------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.39%, 2.29%, 2.24% and 1.84% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 182/366 (to reflect the partial year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 9 Comparing Ongoing Fund Expenses Pioneer Ibbotson Moderate Allocation Fund As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables - -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value [divided by] $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Moderate Allocation Fund Based on actual returns from February 1, 2008 through July 31, 2008. - ------------------------------------------------------------------------------------- Share Class A B C Y - ------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/08 - ------------------------------------------------------------------------------------- Ending Account Value $952.74 $948.09 $949.23 $954.58 (after expenses) on 7/31/08 - ------------------------------------------------------------------------------------- Expenses Paid $6.70 $10.85 $10.27 $4.86 During Period* - ------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.38%, 2.24%, 2.12% and 1.00% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 182/366 (to reflect the partial year period) to calculate the "Expenses Paid During Period" in the table above. 10 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Moderate Allocation Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from February 1, 2008 through July 31, 2008. - ------------------------------------------------------------------------------------- Share Class A B C Y - ------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 7/31/08 - ------------------------------------------------------------------------------------- Ending Account Value $1,018.00 $1,013.72 $1,014.32 $1,019.89 (after expenses) on 7/31/08 - ------------------------------------------------------------------------------------- Expenses Paid $6.92 $11.22 $10.62 $5.02 During Period* - ------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.38%, 2.24%, 2.12% and 1.00% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 182/366 (to reflect the partial year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 11 Comparing Ongoing Fund Expenses Pioneer Ibbotson Growth Allocation Fund As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables - -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value [divided by] $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Growth Allocation Fund Based on actual returns from February 1, 2008 through July 31, 2008. - ------------------------------------------------------------------------------------- Share Class A B C Y - ------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/08 - ------------------------------------------------------------------------------------- Ending Account Value $943.47 $939.93 $940.17 $946.31 (after expenses) on 7/31/08 - ------------------------------------------------------------------------------------- Expenses Paid $7.59 $11.43 $10.95 $5.52 During Period* - ------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.57%, 2.37%, 2.27% and 1.14% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 182/366 (to reflect the partial year period) to calculate the "Expenses Paid During Period" in the table above. 12 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Growth Allocation Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from February 1, 2008 through July 31, 2008. - ------------------------------------------------------------------------------------- Share Class A B C Y - ------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/08 - ------------------------------------------------------------------------------------- Ending Account Value $1,017.06 $1,013.08 $1,013.58 $1,019.19 (after expenses) on 7/31/08 - ------------------------------------------------------------------------------------- Expenses Paid $7.87 $11.86 $11.36 $5.72 During Period* - ------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.57%, 2.37%, 2.27% and 1.14% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 182/366 (to reflect the partial year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 13 Comparing Ongoing Fund Expenses Pioneer Ibbotson Aggressive Allocation Fund As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables - -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value [divided by] $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Aggressive Allocation Fund Based on actual returns from February 1, 2008 through July 31, 2008. - ------------------------------------------------------------------------------------- Share Class A B C Y - ------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/08 - ------------------------------------------------------------------------------------- Ending Account Value $935.35 $931.58 $931.46 $939.03 (after expenses) on 7/31/08 - ------------------------------------------------------------------------------------- Expenses Paid $8.08 $11.96 $11.38 $5.79 During Period* - ------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.68%, 2.49%, 2.37% and 1.20% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 182/366 (to reflect the partial year period) to calculate the "Expenses Paid During Period" in the table above. 14 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Aggressive Allocation Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from February 1, 2008 through July 31, 2008. - ------------------------------------------------------------------------------------- Share Class A B C Y Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/08 - ------------------------------------------------------------------------------------- Ending Account Value $1,016.51 $1,012.48 $1,013.08 $1,018.90 (after expenses) on 7/31/08 - ------------------------------------------------------------------------------------- Expenses Paid $8.42 $12.46 $11.86 $6.02 During Period* - ------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.68%, 2.49%, 2.37% and 1.20% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 182/366 (to reflect the partial year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 15 Portfolio Reviews | 7/31/08 In general, the most significant factor behind returns for each Portfolio over the fiscal year ended July 31, 2008, was its relative allocation to stocks versus bonds. All major global equity markets experienced significant declines while the fixed-income markets, particularly higher quality sectors, provided positive returns. Conservative Allocation The Fund's total return for the 12-month period ended July 31, 2008, was -2.88% for Class A shares, at net asset value. For the same period, the Fund's benchmarks, the Standard & Poor's 500 Index and the Lehman Brothers Aggregate Bond Index returned -11.09% and 6.15%, respectively. The Fund targeted an asset allocation of 30% equities and 70% fixed-income during the period. Within the equity portion of the Fund, Pioneer Fund was the largest holding at 6.44% of assets on July 31, 2008. Pioneer International Equity Fund was the next largest equity holding at 6.36% of assets. Large-capitalization holdings were weighted slightly above target at the end of the period, reflecting management's view that these stocks were more attractive than their smaller-cap counterparts. Within the fixed-income portion of the Fund, the largest holding at the end of the period was in a shorter-term bond fund, Pioneer Short Term Income Fund, at 26.22%, followed by Pioneer Bond Fund at 23.06% of assets. Moderate Allocation The Fund's total return for the 12-month period ended July 31, 2008, was -7.47% for Class A shares, at net asset value. For the same period, the Fund's benchmarks, the Standard & Poor's 500 Index and the Lehman Brothers Aggregate Bond Index returned -11.09% and 6.15%, respectively. The Fund targeted an asset allocation of 60% equities, 40% fixed-income during the period. Within the equity portion of the Fund, Pioneer Research Fund was the largest holding at 9.95% of assets on July 31, 2008. Pioneer International Equity Fund was the next largest equity holding at 9.28% of assets. Large-capitalization holdings were weighted slightly above target at the end of the period, reflecting management's view that these stocks were more attractive than their smaller-cap counterparts. Within the fixed-income portion of the Fund, the largest holding at the end of the period was in a shorter-term bond fund, Pioneer Short Term Income Fund, at 15.06%, followed by Pioneer Bond Fund at 13.18% of assets. Growth Allocation The Fund's total return for the 12-month period ended July 31, 2008, was -9.88% for Class A shares, at net asset value. For the same period, the Fund's benchmarks, the Standard & Poor's 500 Index and the Lehman Brothers Aggregate Bond Index returned -11.09% and 6.15%, respectively. 16 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 The Fund targeted an asset allocation of 75% equities, 25% fixed-income during the period. Within the equity portion of the Fund, Pioneer International Equity Fund was the largest holding at 11.35% of assets on July 31, 2008. Pioneer Research Fund was the next largest equity holding at 10.74% of assets. Large-capitalization holdings were weighted slightly above target at the end of the period, reflecting management's view that these stocks were more attractive than their smaller-cap counterparts. Within the fixed-income portion of the Fund, the largest holding at the end of the period was in an intermediate-term bond fund, Pioneer Bond Fund, at 9.56% of assets, while a shorter-term bond fund, Pioneer Short Term Income Fund, represented 7.85% of assets. Aggressive Allocation The Fund's total return for the 12-month period ended July 31, 2008, was - -12.03% for Class A shares, at net asset value. For the same period, the Fund's benchmarks, the Standard & Poor's 500 Index and the Lehman Brothers Aggregate Bond Index returned -11.09% and 6.15%, respectively. The Fund targeted an asset allocation of 90% equities, 10% fixed-income during the period. Within the equity portion of the Fund, Pioneer International Equity Fund was the largest holding at 14.93% of assets on July 31, 2008. On the domestic side, Pioneer Research Fund at 12.95% of assets and Pioneer Fund at 10.36% of assets were the largest holdings. Large-capitalization holdings were weighted slightly above target at the end of the period, reflecting management's view that these stocks were more attractive than their smaller-cap counterparts. The fixed-income portion of the Fund was invested in an intermediate-term bond fund, Pioneer Bond Fund, at 5.30% of assets, while Pioneer Short Term Income Fund represented 0.01% of assets. Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Any information in this shareowner report regarding market or economic trends or the factors influencing each portfolios' historical or future performance are statements of the opinion of the portfolios' management as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 17 Prices and Distributions | 7/31/08 Net Asset Value Per Share - -------------------------------------------------------------------------------- Conservative Allocation Fund Class 7/31/08 7/31/07 A $ 10.48 $ 11.28 - -------------------------------------------------------------------------------- B $ 10.31 $ 11.10 - -------------------------------------------------------------------------------- C $ 10.30 $ 11.09 - -------------------------------------------------------------------------------- Y $ 10.50 $ 11.30 - -------------------------------------------------------------------------------- Moderate Allocation Fund Class 7/31/08 7/31/07 A $ 10.89 $ 12.50 - -------------------------------------------------------------------------------- B $ 10.39 $ 11.97 - -------------------------------------------------------------------------------- C $ 10.30 $ 11.88 - -------------------------------------------------------------------------------- Y $ 10.94 $ 12.55 - -------------------------------------------------------------------------------- Growth Allocation Fund Class 7/31/08 7/31/07 A $ 11.50 $ 13.47 - -------------------------------------------------------------------------------- B $ 10.33 $ 12.17 - -------------------------------------------------------------------------------- C $ 10.99 $ 12.90 - -------------------------------------------------------------------------------- Y $ 11.64 $ 13.55 - -------------------------------------------------------------------------------- Aggressive Allocation Fund Class 7/31/08 7/31/07 A $ 11.85 $ 14.20 - -------------------------------------------------------------------------------- B $ 11.29 $ 13.55 - -------------------------------------------------------------------------------- C $ 11.43 $ 13.73 - -------------------------------------------------------------------------------- Y $ 12.02 $ 14.26 - -------------------------------------------------------------------------------- 18 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Distributions Per Share: 8/1/07-7/31/08 Conservative Allocation Fund Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains A $ 0.3486 $ 0.0139 $ 0.1386 - -------------------------------------------------------------------------------- B $ 0.2467 $ 0.0139 $ 0.1386 - -------------------------------------------------------------------------------- C $ 0.2570 $ 0.0139 $ 0.1386 - -------------------------------------------------------------------------------- Y $ 0.2838 $ 0.0139 $ 0.1386 - -------------------------------------------------------------------------------- Moderate Allocation Fund Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains A $ 0.3065 $ 0.0202 $ 0.4165 - -------------------------------------------------------------------------------- B $ 0.2080 $ 0.0202 $ 0.4165 - -------------------------------------------------------------------------------- C $ 0.2334 $ 0.0202 $ 0.4165 - -------------------------------------------------------------------------------- Y $ 0.3516 $ 0.0202 $ 0.4165 - -------------------------------------------------------------------------------- Growth Allocation Fund Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains A $ 0.2478 $ 0.0195 $ 0.4512 - -------------------------------------------------------------------------------- B $ 0.1439 $ 0.0195 $ 0.4512 - -------------------------------------------------------------------------------- C $ 0.1662 $ 0.0195 $ 0.4512 - -------------------------------------------------------------------------------- Y $ 0.2960 $ 0.0195 $ 0.4512 - -------------------------------------------------------------------------------- Aggressive Allocation Fund Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains A $ 0.2347 $ 0.0017 $ 0.5012 - -------------------------------------------------------------------------------- B $ 0.1165 $ 0.0017 $ 0.5012 - -------------------------------------------------------------------------------- C $ 0.1551 $ 0.0017 $ 0.5012 - -------------------------------------------------------------------------------- Y $ 0.2927 $ 0.0017 $ 0.5012 - -------------------------------------------------------------------------------- Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 19 Portfolio Summary | 7/31/08 Pioneer Ibbotson Conservative Allocation Fund Target Asset Allocations - -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Fixed Income 70% Equity 30% Short Term Bond 27.00% - -------------------------------------------------------------------------------- Domestic Corporate Bonds 17.00 - -------------------------------------------------------------------------------- Cash & Cash Equivalents 13.00 - -------------------------------------------------------------------------------- High-Yield Corporate Bonds 13.00 - -------------------------------------------------------------------------------- Large-Cap Growth 9.00 - -------------------------------------------------------------------------------- Large-Cap Value 9.00 - -------------------------------------------------------------------------------- International Equities 8.00 - -------------------------------------------------------------------------------- Mid/Small Cap Value 2.00 - -------------------------------------------------------------------------------- Mid/Small Cap Growth 2.00 - -------------------------------------------------------------------------------- Actual Portfolio Holdings (based on total portfolio) - -------------------------------------------------------------------------------- U.S. Stocks International Stocks - ---------------------------------------------------------------------------------------------- Pioneer Fund 6.44% Pioneer International Equity 6.36% - ---------------------------------------------------------------------------------------------- Pioneer Research 5.35 Pioneer Europe Select Equity 1.11 - ---------------------------------------------------------------------------------------------- Pioneer Cullen Value 3.41 Bonds - ---------------------------------------------------------------------------------------------- Pioneer Independence 3.16 Pioneer Short Term Income 26.22 - ---------------------------------------------------------------------------------------------- Pioneer Oak Ridge Large Cap Growth 2.11 Pioneer Bond 23.06 - ---------------------------------------------------------------------------------------------- Pioneer Value 2.14 Pioneer High Yield 5.51 - ---------------------------------------------------------------------------------------------- Pioneer Small Cap Value 1.07 Pioneer Strategic Income 5.35 - ---------------------------------------------------------------------------------------------- Pioneer Growth Opportunities 1.07 Pioneer Global High Yield 5.25 - ---------------------------------------------------------------------------------------------- Pioneer Mid Cap Growth 1.06 Pioneer Government Income 0.33 - ---------------------------------------------------------------------------------------------- Pioneer Mid Cap Value 1.00 - ---------------------------------------------------------------------------------------------- This list excludes temporary cash and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. 20 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Performance Update | 7/31/08 Class A Shares Pioneer Ibbotson Conservative Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Conservative Allocation Fund at public offering price, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - -------------------------------------------------------------------- Net Asset Public Offering Period Value (NAV) Price (POP) - -------------------------------------------------------------------- Life-of-Class (5/12/05) 3.71% 1.82% 1 Year -2.88 -8.47 - -------------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - -------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------- 1.62% 1.38% - -------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Conservative Allocation Fund 500 Stock Index Aggregate Bond Index 5/05 9425 10000 10000 9599 10358 9963 7/06 9919 10715 10108 10800 12214 10672 7/08 10490 10637 11329 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of maximum 5.75% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/10 for Class A Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 21 Performance Update | 7/31/08 Class B Shares Pioneer Ibbotson Conservative Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Conservative Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------- If If Period Held Redeemed - ------------------------------------------------------------- Life-of-Class (5/12/05) 2.83% 2.24% 1 Year -3.72 -7.43 - ------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------- Gross Net - ------------------------------------------------------------- 2.55% 2.28% - ------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Conservative Allocation Fund 500 Stock Index Aggregate Bond Index 5/05 10000 10000 10000 10178 10358 9963 7/06 10409 10715 10108 11250 12214 10672 7/08 10632 10637 11329 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. "If redeemed" returns reflect the deduction of applicable contingent deferred sales charge (CDSC). Effective December 1, 2004, the period during which a CDSC is applied to withdrawals was shortened to 5 years. The maximum CDSC for Class B shares continues to be 4%. For more complete information, please see the prospectus for details. Note: Shares purchased prior to December 1, 2004 remain subject to the CDSC in effect at the time you purchased those shares. For performance information for shares purchased prior to December 1, 2004, please visit www.pioneerinvestments.com. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/09 for Class B Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. 22 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Performance Update | 7/31/08 Class C Shares Pioneer Ibbotson Conservative Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Conservative Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------- If If Period Held Redeemed - ------------------------------------------------------------- Life-of-Class (5/12/05) 2.83% 2.83% 1 Year -3.63 -3.63 - ------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------- Gross Net - ------------------------------------------------------------- 2.40% 2.28% - ------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Conservative Allocation Fund 500 Stock Index Aggregate Bond Index 5/05 10000 10000 10000 10358 10168 9963 7/06 10715 10419 10108 12214 11253 10672 7/08 10637 10844 11329 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/09 for Class C Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 23 Performance Update | 7/31/08 Class Y Shares Pioneer Ibbotson Conservative Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Conservative Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------ If If Period Held Redeemed - ------------------------------------------------------------ Life-of-Class (5/12/05)* 3.57% 3.57% 1 Year -3.42 -3.42 - ------------------------------------------------------------ Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------ Gross Net - ------------------------------------------------------------ 1.54% 1.54% - ------------------------------------------------------------ * Inception date of Class A Shares. [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Conservative Allocation Fund 500 Stock Index Aggregate Bond Index 5/05 10000 10000 10000 10188 10358 9963 7/06 10538 10715 10108 11477 12214 10672 7/08 11084 10637 11329 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Performance for periods prior to the inception of the Fund's Class Y shares on 10/5/05 reflects the NAV performance of the Fund's Class A shares. The performance does not reflect differences in expenses, including the Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares are generally higher than those of Class Y shares, the performance shown for Class Y shares prior to their inception would have been higher. Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. 24 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Portfolio Summary | 7/31/08 Pioneer Ibbotson Moderate Allocation Fund Target Asset Allocations - -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Equity 60% Fixed Income 40% Short Term Bond 17.00% - -------------------------------------------------------------------------------- Large-Cap Growth 15.50 - -------------------------------------------------------------------------------- Large-Cap Value 15.50 - -------------------------------------------------------------------------------- International Equities 12.00 - -------------------------------------------------------------------------------- Domestic Corporate Bonds 9.00 - -------------------------------------------------------------------------------- High-Yield Corporate Bonds 8.00 - -------------------------------------------------------------------------------- Mid/Small Cap Value 6.00 - -------------------------------------------------------------------------------- Cash & Cash Equivalents 6.00 - -------------------------------------------------------------------------------- Mid/Small Cap Growth 6.00 - -------------------------------------------------------------------------------- Real Estate Investment Trusts (REITs) 3.00 - -------------------------------------------------------------------------------- Emerging Market 2.00 - -------------------------------------------------------------------------------- Actual Portfolio Holdings (based on total portfolio) - -------------------------------------------------------------------------------- U.S. Stocks International Stocks - ---------------------------------------------------------------------------------------------- Pioneer Research 9.95% Pioneer International Equity 9.28% - ---------------------------------------------------------------------------------------------- Pioneer Fund 8.67 Pioneer Europe Select Equity 2.93 - ---------------------------------------------------------------------------------------------- Pioneer Oak Ridge Large Cap Growth 5.14 Pioneer Emerging Markets 2.02 - ---------------------------------------------------------------------------------------------- Pioneer Cullen Value 4.21 Bonds - ---------------------------------------------------------------------------------------------- Pioneer Independence 3.95 Pioneer Short Term Income 15.06 - ---------------------------------------------------------------------------------------------- Pioneer Value 3.91 Pioneer Bond 13.18 - ---------------------------------------------------------------------------------------------- Pioneer Growth Opportunities 3.19 Pioneer High Yield 3.13 - ---------------------------------------------------------------------------------------------- Pioneer Real Estate 3.10 Pioneer Global High Yield 2.54 - ---------------------------------------------------------------------------------------------- Pioneer Mid Cap Value 2.98 Pioneer Strategic Income 2.13 - ---------------------------------------------------------------------------------------------- Pioneer Small Cap Value 2.20 Pioneer Government Income 0.38 - ---------------------------------------------------------------------------------------------- Pioneer Mid Cap Growth 2.05 - ---------------------------------------------------------------------------------------------- This list excludes temporary cash and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 25 Performance Update | 7/31/08 Class A Shares Pioneer Ibbotson Moderate Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Moderate Allocation Fund at public offering price, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ---------------------------------------------------------------- Public Net Asset Offering Period Value (NAV) Price (POP) - ---------------------------------------------------------------- Life-of-Class (8/9/04) 5.79% 4.23% 1 Year -7.47 -12.77 - ---------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ---------------------------------------------------------------- Gross Net - ---------------------------------------------------------------- 1.41% 1.41% - ---------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Moderate Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 9425 10000 10000 10570 11177 10283 7/06 11097 11562 10433 12493 13179 11015 7/08 11560 11478 11692 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of maximum 5.75% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/10 for Class A Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. 26 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Performance Update | 7/31/08 Class B Shares Pioneer Ibbotson Moderate Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Moderate Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------- If If Period Held Redeemed - ------------------------------------------------------------- Life-of-Class (8/9/04) 4.09% 3.64% 1 Year -8.32 -11.80 - ------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------- Gross Net - ------------------------------------------------------------- 2.26% 2.24% - ------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Moderate Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 10000 10000 10000 10978 11177 10283 7/06 11417 11562 10433 12753 13179 11015 7/08 11491 11478 11692 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. "If redeemed" returns reflect the deduction of applicable contingent deferred sales charge (CDSC). Effective December 1, 2004, the period during which a CDSC is applied to withdrawals was shortened to 5 years. The maximum CDSC for Class B shares continues to be 4%. For more complete information, please see the prospectus for details. Note: Shares purchased prior to December 1, 2004 remain subject to the CDSC in effect at the time you purchased those shares. For performance information for shares purchased prior to December 1, 2004, please visit www.pioneerinvestments.com. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/09 for Class B Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 27 Performance Update | 7/31/08 Class C Shares Pioneer Ibbotson Moderate Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Moderate Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------- If If Period Held Redeemed - ------------------------------------------------------------- Life-of-Class (8/9/04) 3.98% 3.98% 1 Year -8.19 -8.19 - ------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------- Gross Net - ------------------------------------------------------------- 2.15% 2.15% [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Moderate Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 10000 10000 10000 11122 11177 10283 7/06 11573 11562 10433 12941 13179 11015 7/08 11882 11478 11692 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/09 for Class C Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. 28 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Performance Update | 7/31/08 Class Y Shares Pioneer Ibbotson Moderate Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Moderate Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------- If If Period Held Redeemed - ------------------------------------------------------------- Life-of-Class (8/9/04)* 6.11% 6.11% 1 Year -7.10 -7.10 - ------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------- Gross Net - ------------------------------------------------------------- 1.05% 1.05% - ------------------------------------------------------------- * Inception date of Class A Shares. [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Moderate Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 10000 10000 10000 11213 11177 10283 7/06 11826 11562 10433 13361 13179 11015 7/08 12413 11478 11692 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Performance for periods prior to the inception of the Fund's Class Y shares on 9/23/05 reflects the NAV performance of the Fund's Class A shares. The performance does not reflect differences in expenses, including the Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares are generally higher than those of Class Y shares, the performance shown for Class Y shares prior to their inception would have been higher. Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 29 Portfolio Summary | 7/31/08 Pioneer Ibbotson Growth Allocation Fund Target Asset Allocations - -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Equity 75% Fixed Income 25% Large-Cap Value 17.50% - -------------------------------------------------------------------------------- Large-Cap Growth 16.50 - -------------------------------------------------------------------------------- International Equities 16.00 - -------------------------------------------------------------------------------- Short Term Bond 12.50 - -------------------------------------------------------------------------------- Mid/Small Cap Growth 8.50 - -------------------------------------------------------------------------------- Mid/Small Cap Value 8.50 - -------------------------------------------------------------------------------- Domestic Corporate Bonds 7.50 - -------------------------------------------------------------------------------- High-Yield Corporate Bonds 5.00 - -------------------------------------------------------------------------------- Emerging Market 4.00 - -------------------------------------------------------------------------------- Real Estate Investment Trusts (REITs) 4.00 - -------------------------------------------------------------------------------- Actual Portfolio Holdings (based on total portfolio) - -------------------------------------------------------------------------------- U.S. Stocks International Stocks - ------------------------------------------------------------------------------------------------ Pioneer Research 10.74% Pioneer International Equity 11.35% - ------------------------------------------------------------------------------------------------ Pioneer Fund 9.25 Pioneer Emerging Markets 4.01 - ------------------------------------------------------------------------------------------------ Pioneer Oak Ridge Large Cap Growth 5.97 Pioneer Europe Select Equity 2.93 - ------------------------------------------------------------------------------------------------ Pioneer Cullen Value 5.48 Bonds - ------------------------------------------------------------------------------------------------ Pioneer Independence 4.78 Pioneer Bond 9.56 - ------------------------------------------------------------------------------------------------ Pioneer Mid Cap Value 4.20 Pioneer Short Term Income 7.85 - ------------------------------------------------------------------------------------------------ Pioneer Real Estate 4.11 Pioneer Global High Yield 1.51 - ------------------------------------------------------------------------------------------------ Pioneer Value 4.04 Pioneer High Yield 1.49 - ------------------------------------------------------------------------------------------------ Pioneer Growth Opportunities 3.98 Pioneer Strategic Income 1.05 - ------------------------------------------------------------------------------------------------ Pioneer Small Cap Value 3.16 Pioneer Government Income 0.01 - ------------------------------------------------------------------------------------------------ Pioneer Mid Cap Growth 3.03 - ------------------------------------------------------------------------------------------------ Pioneer Equity Income 1.50 - ------------------------------------------------------------------------------------------------ This list excludes temporary cash and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. 30 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Performance Update | 7/31/08 Class A Shares Pioneer Ibbotson Growth Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Growth Allocation Fund at public offering price, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ---------------------------------------------------------------- Public Net Asset Offering Period Value (NAV) Price (POP) - ---------------------------------------------------------------- Life-of-Class (8/9/04) 6.74% 5.17% 1 Year -9.88 -15.06 - ---------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ---------------------------------------------------------------- Gross Net - ---------------------------------------------------------------- 1.53% 1.53% - ---------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Growth Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 9425 10000 10000 10892 10283 11177 7/06 11577 10433 11562 13281 11015 13179 7/08 11969 11692 11478 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of maximum 5.75% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/10 for Class A Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 31 Performance Update | 7/31/08 Class B Shares Pioneer Ibbotson Growth Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Growth Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------- If If Period Held Redeemed - ------------------------------------------------------------- Life-of-Class (8/9/04) 3.65% 3.19% 1 Year -10.66 -14.05 - ------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------- Gross Net - ------------------------------------------------------------- 2.41% 2.34% - ------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Growth Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 10000 10000 10000 11046 11177 10283 7/06 11657 11562 10433 13250 13179 11015 7/08 11638 11478 11692 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. "If redeemed" returns reflect the deduction of applicable contingent deferred sales charge (CDSC). Effective December 1, 2004, the period during which a CDSC is applied to withdrawals was shortened to 5 years. The maximum CDSC for Class B shares continues to be 4%. For more complete information, please see the prospectus for details. Note: Shares purchased prior to December 1, 2004 remain subject to the CDSC in effect at the time you purchased those shares. For performance information for shares purchased prior to December 1, 2004, please visit www.pioneerinvestments.com. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/09 for Class B Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. 32 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Performance Update | 7/31/08 Class C Shares Pioneer Ibbotson Growth Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Growth Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------- If If Period Held Redeemed - ------------------------------------------------------------- Life-of-Class (8/9/04) 5.17% 5.17% 1 Year -10.43 -10.43 - ------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------- Gross Net - ------------------------------------------------------------- 2.25% 2.25% - ------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Growth Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 10000 10000 10000 11122 11177 10283 7/06 11573 11562 10433 12941 13179 11015 7/08 11882 11478 11692 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/09 for Class C Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 33 Performance Update | 7/31/08 Class Y Shares Pioneer Ibbotson Growth Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Growth Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------- If If Period Held Redeemed - ------------------------------------------------------------- Life-of-Class (8/9/04)* 7.26% 7.26% 1 Year -9.05 -9.05 - ------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------- Gross Net - ------------------------------------------------------------- 1.17% 1.17% - ------------------------------------------------------------- * Inception date of Class A Shares. [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Growth Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 10000 10000 10000 11553 11177 10283 7/06 12387 11562 10433 14229 13179 11015 7/08 12942 11478 11692 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Performance for periods prior to the inception of the Fund's Class Y shares on 9/26/05 reflects the NAV performance of the Fund's Class A shares. The performance does not reflect differences in expenses, including the Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares are generally higher than those of Class Y shares, the performance shown for Class Y shares prior to their inception would have been higher. Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance shown table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. 34 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Portfolio Summary | 7/31/08 Pioneer Ibbotson Aggressive Allocation Fund Target Asset Allocations - -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Equity 90% Fixed Income 10% International Equities 21.00% - -------------------------------------------------------------------------------- Large-Cap Growth 19.00 - -------------------------------------------------------------------------------- Large-Cap Value 19.00 - -------------------------------------------------------------------------------- Mid/Small Cap Growth 10.50 - -------------------------------------------------------------------------------- Mid/Small Cap Value 10.50 - -------------------------------------------------------------------------------- Domestic Corporate Bonds 7.00 - -------------------------------------------------------------------------------- Emerging Market 5.00 - -------------------------------------------------------------------------------- Real Estate Investment Trusts (REITs) 5.00 - -------------------------------------------------------------------------------- Short Term Bond 3.00 - -------------------------------------------------------------------------------- Actual Portfolio Holdings (based on total portfolio) - -------------------------------------------------------------------------------- U.S. Stocks International Stocks - -------------------------------------------------------------------------------------------- Pioneer Research 12.95% Pioneer International Equity 14.93% - -------------------------------------------------------------------------------------------- Pioneer Fund 10.36 Pioneer Emerging Markets 4.96 - -------------------------------------------------------------------------------------------- Pioneer Oak Ridge Large Cap Growth 8.09 Pioneer Europe Select Equity 4.90 - -------------------------------------------------------------------------------------------- Pioneer Cullen Value 5.81 Bonds - -------------------------------------------------------------------------------------------- Pioneer Growth Opportunities 5.44 Pioneer Bond 5.30 - -------------------------------------------------------------------------------------------- Pioneer Mid Cap Value 5.31 Pioneer Short Term Income 0.01 - -------------------------------------------------------------------------------------------- Pioneer Real Estate 5.06 - -------------------------------------------------------------------------------------------- Pioneer Independence 4.68 - -------------------------------------------------------------------------------------------- Pioneer Small Cap Value 4.36 - -------------------------------------------------------------------------------------------- Pioneer Value 4.00 - -------------------------------------------------------------------------------------------- Pioneer Mid Cap Growth 3.01 - -------------------------------------------------------------------------------------------- Pioneer Equity Income 0.83 - -------------------------------------------------------------------------------------------- This list excludes temporary cash and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 35 Performance Update | 7/31/08 Class A Shares Pioneer Ibbotson Aggressive Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Aggressive Allocation Fund at public offering price, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - --------------------------------------------------------------- Public Net Asset Offering Period Value (NAV) Price (POP) - --------------------------------------------------------------- Life-of-Class (8/9/04) 7.55% 5.96% 1 Year -12.03 -17.11 - --------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - --------------------------------------------------------------- Gross Net - --------------------------------------------------------------- 1.68% 1.67% - --------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Aggressive Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 9425 10000 10000 11173 11177 10283 7/06 11989 11562 10433 13956 13179 11015 7/08 12276 11478 11692 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of maximum 5.75% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/10 for Class A Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. 36 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Performance Update | 7/31/08 Class B Shares Pioneer Ibbotson Aggressive Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Aggressive Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------- If If Period Held Redeemed - ------------------------------------------------------------- Life-of-Class (8/9/04) 5.87% 5.45% 1 Year -12.72 -16.06 - ------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------- Gross Net - ------------------------------------------------------------- 2.55% 2.46% - ------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Aggressive Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 10000 10000 10000 11690 11177 10283 7/06 12434 11562 10433 14361 13179 11015 7/08 12334 11478 11692 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. "If redeemed" returns reflect the deduction of applicable contingent deferred sales charge (CDSC). Effective December 1, 2004, the period during which a CDSC is applied to withdrawals was shortened to 5 years. The maximum CDSC for Class B shares continues to be 4%. For more complete information, please see the prospectus for details. Note: Shares purchased prior to December 1, 2004 remain subject to the CDSC in effect at the time you purchased those shares. For performance information for shares purchased prior to December 1, 2004, please visit www.pioneerinvestments.com. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/09 for Class B Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 37 Performance Update | 7/31/08 Class C Shares Pioneer Ibbotson Aggressive Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Aggressive Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------- If If Period Held Redeemed - ------------------------------------------------------------- Life-of-Class (8/9/04) 6.28% 6.28% 1 Year -12.61 -12.61 - ------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------- Gross Net - ------------------------------------------------------------- 2.38% 2.38% - ------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Aggressive Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 10000 10000 10000 11563 11177 10283 7/06 12299 11562 10433 14221 13179 11015 7/08 12429 11478 11692 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through 12/1/09 for Class C Shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. 38 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Performance Update | 7/31/08 Class Y Shares Pioneer Ibbotson Aggressive Allocation Fund Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Aggressive Allocation Fund, compared to that of the Standard & Poor's 500 Stock Index and Lehman Brothers Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2008) - ------------------------------------------------------------- If If Period Held Redeemed - ------------------------------------------------------------- Life-of-Class (8/9/04)* 8.15% 8.15% 1 Year -10.83 -10.83 - ------------------------------------------------------------- Expense Ratio (Per prospectus dated 12/1/07) - ------------------------------------------------------------- Gross Net - ------------------------------------------------------------- 1.25% 1.25% - ------------------------------------------------------------- * Inception date of Class A Shares. [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Standard & Poor's Lehman Brothers Aggressive Allocation Fund 500 Stock Index Aggregate Bond Index 8/04 10000 10000 10000 11860 11177 10283 7/06 12759 11562 10433 14941 13179 11015 7/08 13323 11478 11692 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Performance for periods prior to the inception of the Fund's Class Y shares on 9/23/05 reflects the NAV performance of the Fund's Class A shares. The performance does not reflect differences in expenses, including the Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares are generally higher than those of Class Y shares, the performance shown for Class Y shares prior to their inception would have been higher. Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Lehman Brothers Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. You cannot invest directly in an Index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 39 Schedule of Investments | 7/31/08 Pioneer Ibbotson Conservative Allocation Fund - -------------------------------------------------------------------------------- Shares Value - -------------------------------------------------------------------------------- MUTUAL FUNDS -- 93.1% PIONEER FUNDS -- 93.1% 1,063,834 Pioneer Bond Fund Class Y $ 9,510,677 75,098 Pioneer Cullen Value Fund Class Y 1,405,842 16,073 Pioneer Europe Select Equity Fund Class Y 457,604 63,368 Pioneer Fund Class Y 2,655,757 202,358 Pioneer Global High Yield Fund Class Y 2,163,208 14,225 Pioneer Government Income Fund Class Y 133,997 19,188 Pioneer Growth Opportunities Fund Class Y 440,163 232,968 Pioneer High Yield Fund Class Y 2,273,763 121,738 Pioneer Independence Fund Class Y 1,301,382 118,703 Pioneer International Equity Fund Class Y 2,620,954 30,567 Pioneer Mid-Cap Growth Fund Class Y 437,715 19,457 Pioneer Mid-Cap Value Fund Class Y 414,040 74,093 Pioneer Oak Ridge Large Cap Growth Fund Class Y 872,078 249,524 Pioneer Research Fund Class Y 2,208,289 1,134,684 Pioneer Short Term Income Fund Class Y 10,813,542 19,970 Pioneer Small Cap Value Fund Class Y 443,129 215,764 Pioneer Strategic Income Fund Class Y 2,207,268 71,796 Pioneer Value Fund Class Y 883,087 - ------------------------------------------------------------------------------ TOTAL INVESTMENTS IN SECURITIES -- 93.1% (Cost $43,682,548) (a) $41,242,495 - ------------------------------------------------------------------------------ OTHER ASSETS AND LIABILITIES -- 6.9% $ 3,051,286 - ------------------------------------------------------------------------------ TOTAL NET ASSETS -- 100.0% $44,293,781 ============================================================================== (a) At July 31, 2008, the net unrealized loss on investments based on cost for federal tax purposes of $44,018,349 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 17,233 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (2,793,087) ----------- Net unrealized loss $(2,775,854) =========== The accompanying notes are an integral part of these financial statements. 40 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Schedule of Investments | 7/31/08 Pioneer Ibbotson Moderate Allocation Fund - -------------------------------------------------------------------------------- Shares Value - -------------------------------------------------------------------------------- MUTUAL FUNDS -- 98.1% PIONEER FUNDS -- 98.1% 3,772,572 Pioneer Bond Fund Class Y $ 33,726,789 575,057 Pioneer Cullen Value Fund Class Y 10,765,060 148,320 Pioneer Emerging Markets Fund Class Y 5,182,287 262,953 Pioneer Europe Select Equity Fund Class Y 7,486,273 529,484 Pioneer Fund Class Y 22,190,690 608,898 Pioneer Global High Yield Fund Class Y 6,509,123 102,820 Pioneer Government Income Fund Class Y 968,562 355,485 Pioneer Growth Opportunities Fund Class Y 8,154,825 819,626 Pioneer High Yield Fund Class Y 7,999,546 946,769 Pioneer Independence Fund Class Y 10,120,963 1,075,891 Pioneer International Equity Fund Class Y 23,755,666 365,981 Pioneer Mid-Cap Growth Fund Class Y 5,240,843 357,842 Pioneer Mid-Cap Value Fund Class Y 7,614,872 1,117,580 Pioneer Oak Ridge Large Cap Growth Fund Class Y 13,153,915 370,410 Pioneer Real Estate Shares Fund Class Y 7,934,179 2,878,534 Pioneer Research Fund Class Y 25,475,023 4,043,433 Pioneer Short Term Income Fund Class Y 38,533,916 254,052 Pioneer Small Cap Value Fund Class Y 5,637,413 533,911 Pioneer Strategic Income Fund Class Y 5,461,906 813,655 Pioneer Value Fund Class Y 10,007,962 - -------------------------------------------------------------------------------- TOTAL INVESTMENTS IN SECURITIES -- 98.1% (Cost $271,590,366) (a) $255,919,813 - -------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- 1.9% $ 5,098,357 - -------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $261,018,170 ================================================================================ (a) At July 31, 2008, the net unrealized loss on investments based on cost for federal tax purposes of $273,525,919 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 3,782,436 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (21,388,542) ------------ Net unrealized loss $(17,606,106) ============ The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 41 Schedule of Investments | 7/31/08 Pioneer Ibbotson Growth Allocation Fund - ---------------------------------------------------------------------------------- Shares Value - ---------------------------------------------------------------------------------- MUTUAL FUNDS--100.3% PIONEER FUNDS--100.3% 2,702,313 Pioneer Bond Fund Class Y $ 24,158,675 739,075 Pioneer Cullen Value Fund Class Y 13,835,485 289,813 Pioneer Emerging Markets Fund Class Y 10,126,083 140,396 Pioneer Equity Income Fund Class Y 3,787,873 260,011 Pioneer Europe Select Equity Fund Class Y 7,402,505 557,617 Pioneer Fund Class Y 23,369,712 357,629 Pioneer Global High Yield Fund Class Y 3,823,057 3,777 Pioneer Government Income Fund Class Y 35,575 438,811 Pioneer Growth Opportunities Fund Class Y 10,066,314 384,941 Pioneer High Yield Fund Class Y 3,757,024 1,129,741 Pioneer Independence Fund Class Y 12,076,936 1,298,955 Pioneer International Equity Fund Class Y 28,680,926 534,614 Pioneer Mid-Cap Growth Fund Class Y 7,655,678 498,407 Pioneer Mid-Cap Value Fund Class Y 10,606,111 1,280,960 Pioneer Oak Ridge Large Cap Growth Fund Class Y 15,076,898 484,445 Pioneer Real Estate Shares Fund Class Y 10,376,821 3,066,822 Pioneer Research Fund Class Y 27,141,379 2,079,795 Pioneer Short Term Income Fund Class Y 19,820,451 359,258 Pioneer Small Cap Value Fund Class Y 7,971,938 259,583 Pioneer Strategic Income Fund Class Y 2,655,532 830,796 Pioneer Value Fund Class Y 10,218,788 - ---------------------------------------------------------------------------------- TOTAL INVESTMENTS IN SECURITIES -- 100.3% (Cost $273,681,228) (a) $252,643,761 - ---------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- (0.3)% $ (689,027) - ---------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $251,954,734 ================================================================================== (a) At July 31, 2008, the net unrealized loss on investments based on cost for federal tax purposes of $274,890,598 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 3,741,515 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (25,988,352) ------------ Net unrealized loss $(22,246,837) ============ The accompanying notes are an integral part of these financial statements. 42 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Schedule of Investments | 7/31/08 Pioneer Ibbotson Aggressive Allocation Fund - ------------------------------------------------------------------------------ Shares Valu - ------------------------------------------------------------------------------ MUTUAL FUNDS--99.9% PIONEER FUNDS--99.9% 944,114 Pioneer Bond Fund Class Y $ 8,440,379 494,515 Pioneer Cullen Value Fund Class Y 9,257,314 226,150 Pioneer Emerging Markets Fund Class Y 7,901,686 49,201 Pioneer Equity Income Fund Class Y 1,327,452 274,378 Pioneer Europe Select Equity Fund Class Y 7,811,539 393,707 Pioneer Fund Class Y 16,500,270 377,489 Pioneer Growth Opportunities Fund Class Y 8,659,600 697,880 Pioneer Independence Fund Class Y 7,460,336 1,077,197 Pioneer International Equity Fund Class Y 23,784,519 335,261 Pioneer Mid-Cap Growth Fund Class Y 4,800,941 397,393 Pioneer Mid-Cap Value Fund Class Y 8,456,526 1,094,779 Pioneer Oak Ridge Large Cap Growth Fund Class Y 12,885,551 376,049 Pioneer Real Estate Shares Fund Class Y 8,054,966 2,331,552 Pioneer Research Fund Class Y 20,634,239 1,561 Pioneer Short Term Income Fund Class Y 14,879 312,923 Pioneer Small Cap Value Fund Class Y 6,943,769 518,098 Pioneer Value Fund Class Y 6,372,607 - ------------------------------------------------------------------------------ TOTAL INVESTMENTS IN SECURITIES -- 99.9% (Cost $173,340,252) (a) $159,306,573 - ------------------------------------------------------------------------------ OTHER ASSETS AND LIABILITIES -- 0.1% $ 74,198 - ------------------------------------------------------------------------------ TOTAL NET ASSETS -- 100.0% $159,380,771 ============================================================================== (a) At July 31, 2008, the net unrealized loss on investments based on cost for federal tax purposes of $174,648,746 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 3,027,234 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (18,369,407) -------------- Net unrealized loss $ (15,342,173) ============== The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 43 Statements of Assets and Liabilities | 7/31/08 - ------------------------------------------------------------------------------------------------------------------ Conservative Moderate Growth Aggressive Allocation Allocation Allocation Allocation Fund Fund Fund Fund - ------------------------------------------------------------------------------------------------------------------ ASSETS: Investments in securities of affiliated $41,242,495 $255,919,813 $252,643,761 $159,306,573 issuers, at value (at cost $43,682,548, $271,590,366, $273,681,228 and $173,340,252, respectively) Cash 3,137,150 5,181,245 -- 336,916 Receivables for: Investment Funds sold 3,988 281,053 361,349 26,852 Capital stock sold 177,847 332,607 125,330 65,377 Due from Pioneer Investment Management, Inc. 6,472 -- 18,900 6,010 Other assets 19,800 18,996 26,253 27,684 - ------------------------------------------------------------------------------------------------------------------ Total assets $44,587,752 $261,733,714 $253,175,593 $159,769,412 - ------------------------------------------------------------------------------------------------------------------ LIABILITIES: Payables for: Due to Custodian $ -- $ -- $ 36,745 $ -- Investment Funds purchased 201,449 69,110 59,235 55,148 Capital stock redeemed 10,690 367,847 791,998 114,900 Due to affiliates 30,941 191,681 214,084 130,177 Accrued expenses and other liabilities 50,891 86,906 118,797 88,416 - ------------------------------------------------------------------------------------------------------------------ Total liabilities $ 293,971 $ 715,544 $ 1,220,859 $ 388,641 - ------------------------------------------------------------------------------------------------------------------ NET ASSETS: Paid-in capital $45,575,053 $263,066,345 $257,169,680 $162,262,780 Undistributed net investment income 592,800 2,097,791 530,131 -- Accumulated net realized gain on investments 565,981 11,524,587 15,292,390 11,151,670 Net unrealized loss on investments (2,440,053) (15,670,553) (21,037,467) (14,033,679) - ------------------------------------------------------------------------------------------------------------------ Total net assets $44,293,781 $261,018,170 $251,954,734 $159,380,771 - ------------------------------------------------------------------------------------------------------------------ NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Net Assets of Class A shares $26,782,559 $147,003,825 $139,670,335 $102,941,254 Net Assets of Class B shares $ 6,369,566 $ 50,515,154 $ 61,703,689 $ 30,404,566 Net Assets of Class C shares $11,131,729 $ 45,593,813 $ 47,897,689 $ 22,930,290 Net Assets of Class Y shares $ 9,927 $ 17,905,378 $ 2,683,021 $ 3,104,661 Class A Shares outstanding 2,554,389 13,502,047 12,148,831 8,684,714 Class B Shares outstanding 617,808 4,860,216 5,970,546 2,692,228 Class C Shares outstanding 1,081,226 4,425,672 4,360,260 2,005,933 Class Y Shares outstanding 945 1,635,951 230,441 258,318 Net Asset Value - Class A shares $ 10.48 $ 10.89 $ 11.50 $ 11.85 Net Asset Value - Class B shares $ 10.31 $ 10.39 $ 10.33 $ 11.29 Net Asset Value - Class C shares $ 10.30 $ 10.30 $ 10.99 $ 11.43 Net Asset Value - Class Y shares $ 10.50 $ 10.94 $ 11.64 $ 12.02 MAXIMUM OFFERING PRICE: Class A (100 [divided by] 94.25 x net asset value per share) $ 11.12 $ 11.55 $ 12.20 $ 12.57 ================================================================================================================== The accompanying notes are an integral part of these financial statements. 44 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Statements of Operations For the Year Ended 7/31/08 - ------------------------------------------------------------------------------------------------------------ Conservative Moderate Growth Aggressive Allocation Allocation Allocation Allocation Fund Fund Fund Fund - ------------------------------------------------------------------------------------------------------------ INVESTMENT INCOME: Dividend income from securities of affiliated issuers $ 1,469,226 $ 7,673,003 $ 5,684,388 $ 2,436,261 Interest 105,401 131,750 1,323 662 - ------------------------------------------------------------------------------------------------------------ Total investment income $ 1,574,627 $ 7,804,753 $ 5,685,711 $ 2,436,923 - ------------------------------------------------------------------------------------------------------------ EXPENSES: Management fees $ 54,704 $ 378,750 $ 365,976 $ 230,340 Transfer agent fees Class A 37,106 207,390 322,400 283,485 Class B 12,713 144,555 231,227 132,536 Class C 14,016 58,757 83,202 46,856 Class Y 80 182 670 783 Distribution fees Class A 65,499 402,600 377,634 283,478 Class B 55,389 586,568 714,300 351,935 Class C 103,027 493,572 529,301 246,385 Administrative fees 7,364 50,986 49,283 31,006 Custodian fees 22,427 152,695 236,027 139,173 Registration fees 57,290 60,636 71,755 58,192 Professional fees 50,095 62,588 62,287 57,539 Printing fees 5,493 55,043 76,901 51,393 Fees and expenses of nonaffiliated trustees 5,220 6,932 5,595 4,636 Insurance expense 663 5,443 5,390 3,274 Miscellaneous 5,604 24,876 28,128 18,874 - ------------------------------------------------------------------------------------------------------------ Total expenses $ 496,690 $ 2,691,573 $ 3,160,076 $ 1,939,885 Less management fees waived and expenses reimbursed by Pioneer Investment Management, Inc. (29,564) -- (44,474) (20,779) Less fees paid indirectly (1,570) (12,121) (20,891) (14,843) - ------------------------------------------------------------------------------------------------------------ Net expenses $ 465,556 $ 2,679,452 $ 3,094,711 $ 1,904,263 - ------------------------------------------------------------------------------------------------------------ Net investment income $ 1,109,071 $ 5,125,301 $ 2,591,000 $ 532,660 - ------------------------------------------------------------------------------------------------------------ REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: Net realized loss on investments $ (498,360) $ (1,295,121) $ (1,784,331) $ (848,450) - ------------------------------------------------------------------------------------------------------------ Realized gain distributions from investment company shares $ 1,439,643 $ 18,407,038 $ 22,007,861 $ 16,316,457 - ------------------------------------------------------------------------------------------------------------ Change in net unrealized gain (loss) on investments $(3,369,151) $(45,111,196) $(52,590,535) $(38,638,792) - ------------------------------------------------------------------------------------------------------------ Net loss on investments $(2,427,868) $(27,999,279) $(32,367,005) $(23,170,785) - ------------------------------------------------------------------------------------------------------------ Net decrease in net assets resulting from operations $(1,318,797) $(22,873,978) $(29,776,005) $(22,638,125) ============================================================================================================ The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 45 Statements of Changes in Net Assets - --------------------------------------------------------------------------------------------------------- Conservative Moderate Allocation Fund Allocation Fund ------------------------------- ------------------------------- Year Year Year Year Ended Ended Ended Ended 7/31/08 7/31/07 7/31/08 7/31/07 - --------------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 1,109,071 $ 757,712 $ 5,125,301 $ 4,392,287 Net realized gain on investments 941,283 445,410 17,111,917 10,341,046 Change in net unrealized gain (loss) on investments (3,369,151) 943,898 (45,111,196) 18,224,119 - --------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from operations $ (1,318,797) $ 2,147,020 $ (22,873,978) $ 32,957,452 - --------------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income Class A ($0.35, $0.19, $0.31 and $0.28, respectively) $ (795,219) $ (352,800) $ (4,112,740) $ (3,595,361) Class B ($0.25, $0.16, $0.21 and $0.19, respectively) (115,429) (51,337) (1,070,630) (965,092) Class C ($0.26, $0.16, $0.23 and $0.21, respectively) (233,014) (109,847) (996,085) (710,891) Class Y ($0.28, $0.19, $0.35 and $0.32, respectively) (268) (176) (631,068) (686,855) Net realized gain on investments Class A ($0.15, $0.02, $0.44 and $0.03, respectively) (347,880) (35,042) (5,859,816) (433,722) Class B ($0.15, $0.02, $0.44 and $0.03, respectively) (71,354) (6,124) (2,247,809) (173,354) Class C ($0.15, $0.02, $0.44 and $0.03, respectively) (138,267) (13,007) (1,863,711) (112,813) Class Y ($0.15, $0.02, $0.44 and $0.03, respectively) (144) (18) (783,810) (72,838) - --------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (1,701,575) $ (568,351) $ (17,565,669) $ (6,750,926) - --------------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $ 26,850,562 $ 27,279,565 $ 74,617,312 $ 82,429,746 Reinvestment of distributions 1,306,808 470,891 15,706,508 6,044,029 Cost of shares repurchased (18,721,233) (8,329,288) (86,203,476) (81,098,373) - --------------------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $ 9,436,137 $ 19,421,168 $ 4,120,344 $ 7,375,402 - --------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets $ 6,415,765 $ 20,999,837 $ (36,319,303) $ 33,581,928 NET ASSETS: Beginning of period 37,878,016 16,878,179 297,337,473 263,755,545 - --------------------------------------------------------------------------------------------------------- End of period $ 44,293,781 $ 37,878,016 $ 261,018,170 $ 297,337,473 - --------------------------------------------------------------------------------------------------------- Undistributed net investment income, end of period $ 592,800 $ 483,044 $ 2,097,791 $ 2,072,065 - --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 46 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 - ---------------------------------------------------------------------------------------------------------- Aggressive Growth Allocation Fund Allocation Fund ------------------------------ --------------------------------- Year Year Year Year Ended Ended Ended Ended 7/31/08 7/31/07 7/31/08 7/31/07 - ---------------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 2,591,000 $ 1,977,202 $ 532,660 $ 332,826 Net realized gain on investments 20,223,530 10,106,417 15,468,007 8,294,252 Change in net unrealized gain (loss) on investments (52,590,535) 20,626,049 (38,638,792) 14,484,776 - ---------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from operations $(29,776,005) $ 32,709,668 $(22,638,125) $ 23,111,854 - ---------------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income Class A ($0.25, $0.23, $0.23 and $0.16, respectively) $ (2,937,370) $ (2,440,569) $ (1,951,184) $ (1,175,654) Class B ($0.14, $0.14, $0.12 and $0.06, respectively) (885,892) (862,255) (315,424) (170,484) Class C ($0.17, $0.16, $0.16 and $0.08, respectively) (707,330) (542,866) (288,248) (119,362) Class Y ($0.30, $0.27, $0.29 and $0.20 respectively) (68,685) (55,783) (86,685) (79,270) Net realized gain on investments Class A ($0.47, $0.10, $0.50 and $0.06, respectively) (5,579,580) (1,069,019) (4,180,871) (427,031) Class B ($0.47, $0.10, $0.50 and $0.06, respectively) (2,897,772) (597,958) (1,361,602) (153,679) Class C ($0.47, $0.10, $0.50 and $0.06, respectively) (2,003,251) (334,483) (934,623) (81,935) Class Y ($0.47, $0.10, $0.50 and $0.06, respectively) (109,224) (20,830) (148,937) (22,196) - ---------------------------------------------------------------------------------------------------------- Total distributions to shareowners $(15,189,104) $ (5,923,763) $ (9,267,574) $ (2,229,611) - ---------------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $ 73,007,583 $101,083,097 $ 45,683,649 $ 59,146,717 Reinvestment of distributions 14,017,659 5,541,108 8,711,466 2,097,785 Cost of shares repurchased (79,470,673) (57,961,702) (41,665,902) (38,857,236) - ---------------------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $ 7,554,569 $ 48,662,503 $ 12,729,213 $ 22,387,266 - ---------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets $(37,410,540) $ 75,448,408 $(19,176,486) $ 43,269,509 NET ASSETS: Beginning of period 289,365,274 213,916,866 178,557,257 135,287,748 - ---------------------------------------------------------------------------------------------------------- End of period $251,954,734 $289,365,274 $159,380,771 $178,557,257 - ---------------------------------------------------------------------------------------------------------- Undistributed net investment income, end of period $ 530,131 $ 571,326 $ -- $ 321,362 - ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 47 Statements of Changes in Net Assets (continued) For the Years Ended 7/31/08 and 7/31/07 Conservative Allocation Fund -------------------------------------------------------------- '08 Shares '08 Amount '07 Shares '07 Amount Class A Shares sold 1,492,458 $16,447,805 1,675,353 $18,500,177 Reinvestment of distributions 86,381 953,643 33,733 368,359 Less shares repurchased (1,091,471) (12,090,392) (479,247) (5,344,105) - -------------------------------------------------------------------------------------------------- Net increase 487,368 $ 5,311,056 1,229,839 $13,524,431 ================================================================================================== Class B Shares sold 310,489 $ 3,337,164 236,187 $ 2,583,516 Reinvestment of distributions 14,331 156,352 4,693 50,688 Less shares repurchased (132,895) (1,434,789) (85,992) (940,137) - -------------------------------------------------------------------------------------------------- Net increase 191,925 $ 2,058,727 154,888 $ 1,694,067 ================================================================================================== Class C Shares sold 657,247 $ 7,065,593 568,924 $ 6,195,872 Reinvestment of distributions 18,056 196,813 4,805 51,844 Less shares repurchased (479,030) (5,196,052) (187,162) (2,045,046) - -------------------------------------------------------------------------------------------------- Net increase 196,273 $ 2,066,354 386,567 $ 4,202,670 ================================================================================================== Moderate Allocation Fund -------------------------------------------------------------- '08 Shares '08 Amount '07 Shares '07 Amount Class A Shares sold 3,598,773 $43,102,735 4,074,111 $49,725,116 Reinvestment of distributions 795,383 9,512,778 314,311 3,781,164 Less shares repurchased (4,097,693) (48,301,775) (4,222,518) (51,804,650) - -------------------------------------------------------------------------------------------------- Net increase 296,463 $ 4,313,738 165,904 $ 1,701,630 ================================================================================================== Class B Shares sold 754,664 $ 8,728,338 932,886 $10,869,626 Reinvestment of distributions 263,378 3,023,582 89,682 1,037,617 Less shares repurchased (1,238,207) (13,808,834) (983,186) (11,535,587) - -------------------------------------------------------------------------------------------------- Net increase (decrease) (220,165) $(2,056,914) 39,382 $ 371,656 ================================================================================================== Class C Shares sold 1,811,017 $20,460,013 1,736,902 $20,273,756 Reinvestment of distributions 175,060 1,988,684 50,255 576,929 Less shares repurchased (1,552,139) (17,224,907) (782,532) (9,089,223) - -------------------------------------------------------------------------------------------------- Net increase 433,938 $ 5,223,790 1,004,625 $11,761,462 ================================================================================================== Class Y Shares sold 192,451 $ 2,326,226 127,023 $ 1,561,248 Reinvestment of distributions 98,537 1,181,464 53,758 648,319 Less shares repurchased (570,437) (6,867,960) (696,159) (8,668,913) - -------------------------------------------------------------------------------------------------- Net decrease (279,449) $(3,360,270) (515,378) $(6,459,346) ================================================================================================== The accompanying notes are an integral part of these financial statements. 48 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Growth Allocation Fund ---------------------------------------------------------------- '08 Shares '08 Amount '07 Shares '07 Amount Class A Shares sold 3,395,525 $43,734,999 4,581,469 $59,854,154 Reinvestment of distributions 630,691 8,161,140 260,778 3,361,429 Less shares repurchased (3,570,650) (45,171,530) (2,797,188) (36,805,149) - ---------------------------------------------------------------------------------------------------- Net increase 455,566 $ 6,724,609 2,045,059 $26,410,434 ==================================================================================================== Class B Shares sold 823,011 $ 9,473,075 1,407,692 $16,572,434 Reinvestment of distributions 309,971 3,623,560 119,895 1,403,970 Less shares repurchased (1,416,326) (15,983,450) (891,286) (10,570,178) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) (283,344) $(2,886,815) 636,301 $ 7,406,226 ==================================================================================================== Class C Shares sold 1,519,021 $18,651,049 1,876,853 $23,627,869 Reinvestment of distributions 168,686 2,093,396 56,602 702,425 Less shares repurchased (1,424,326) (17,176,694) (714,675) (9,034,349) - ---------------------------------------------------------------------------------------------------- Net increase 263,381 $ 3,567,751 1,218,780 $15,295,945 ==================================================================================================== Class Y Shares sold 87,438 $ 1,148,460 76,408 $ 1,028,640 Reinvestment of distributions 10,695 139,563 5,650 73,284 Less shares repurchased (85,865) (1,138,999) (116,745) (1,552,026) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) 12,268 $ 149,024 (34,687) $ (450,102) ==================================================================================================== Aggressive Allocation Fund -------------------------------------------------------------- '08 Shares '08 Amount '07 Shares '07 Amount Class A Shares sold 2,256,034 $30,115,692 2,897,818 $39,680,448 Reinvestment of distributions 437,593 5,964,389 113,085 1,533,432 Less shares repurchased (2,041,754) (26,733,582) (1,820,781) (25,206,002) - ---------------------------------------------------------------------------------------------------- Net increase 651,873 $ 9,346,499 1,190,122 $16,007,878 ==================================================================================================== Class B Shares sold 371,057 $ 4,699,127 614,633 $ 8,000,633 Reinvestment of distributions 121,796 1,589,433 23,644 307,367 Less shares repurchased (586,736) (7,366,091) (417,719) (5,489,710) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) (93,883) $(1,077,531) 220,558 $ 2,818,290 ==================================================================================================== Class C Shares sold 709,025 $ 9,135,614 724,822 $ 9,693,390 Reinvestment of distributions 75,540 997,888 12,263 161,506 Less shares repurchased (495,830) (6,226,149) (313,094) (4,183,498) - ---------------------------------------------------------------------------------------------------- Net increase 288,735 $ 3,907,353 423,991 $ 5,671,398 ==================================================================================================== Class Y Shares sold 125,798 $ 1,733,216 131,135 $ 1,772,246 Reinvestment of distributions 11,627 159,756 7,031 95,480 Less shares repurchased (101,522) (1,340,080) (287,047) (3,978,026) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) 35,903 $ 552,892 (148,881) $(2,110,300) ==================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 49 Financial Highlights Conservative Allocation Fund Year Year Year 5/12/05(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class A Net asset value, beginning of period $ 11.28 $ 10.56 $ 10.29 $ 10.00 - ------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income(b) $ 0.33 $ 0.32 $ 0.25 $ 0.05 Net realized and unrealized gain (loss) on investments (0.63) 0.61 0.09 0.24 - ------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (0.30) $ 0.93 $ 0.34 $ 0.29 Distributions to shareowners: Net investment income (0.35) (0.19) (0.06) -- Net realized gain (0.15) (0.02) (0.01) -- - ------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.50) $ (0.21) $ (0.07) $ -- - ------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.80) $ 0.72 $ 0.27 $ 0.29 - ------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 10.48 $ 11.28 $ 10.56 $ 10.29 ====================================================================================================== Total return* (2.88)% 8.89% 3.33% 2.90%** Ratio of net expenses to average net assets+++ 0.78% 0.78% 0.78% 0.78%*** Ratio of net investment income to average net assets+++ 2.96% 2.90% 2.38% 2.26%*** Portfolio turnover rate 29% 15% 15% 9%** Net assets, end of period (in thousands) $26,782 $ 23,324 $ 8,837 $ 877 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 0.89% 0.98% 2.12% 40.41%*** Net investment income (loss) 2.86% 2.70% 1.04% (37.37)%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 0.78% 0.78% 0.78% 0.78%*** Net investment income 2.97% 2.90% 2.38% 2.26%*** ====================================================================================================== (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. 50 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Conservative Allocation Fund Year Year Year 5/12/05(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class B Net asset value, beginning of period $ 11.10 $ 10.44 $ 10.28 $ 10.00 - ------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income(b) $ 0.22 $ 0.21 $ 0.15 $ 0.03 Net realized and unrealized gain (loss) on investments (0.61) 0.63 0.08 0.25 - ------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (0.39) $ 0.84 $ 0.23 $ 0.28 Distributions to shareowners: Net investment income (0.25) (0.16) (0.06) -- Net realized gain (0.15) (0.02) (0.01) -- - ------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.40) $ (0.18) $ (0.07) $ -- - ------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (0.79) $ 0.66 $ 0.16 $ 0.28 - ------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.31 $ 11.10 $ 10.44 $ 10.28 ================================================================================================= Total return* (3.72)% 8.09% 2.26% 2.80%** Ratio of net expenses to average net assets+++ 1.69% 1.69% 1.68% 1.68%*** Ratio of net investment income to average net assets+++ 2.05% 1.91% 1.49% 1.23%*** Portfolio turnover rate 29% 15% 15% 9%** Net assets, end of period (in thousands) $ 6,370 $ 4,729 $ 2,830 $ 221 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 1.73% 1.91% 3.08% 38.96%*** Net investment income (loss) 2.01% 1.69% 0.09% (36.05)%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 1.68% 1.68% 1.68% 1.68%*** Net investment income 2.05% 1.92% 1.49% 1.23%*** ================================================================================================= (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 51 Financial Highlights (continued) Conservative Allocation Fund Year Year Year 5/12/05(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class C Net asset value, beginning of period $ 11.09 $ 10.44 $ 10.26 $ 10.00 - ---------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income(b) $ 0.23 $ 0.21 $ 0.15 $ 0.03 Net realized and unrealized gain (loss) on investments (0.61) 0.62 0.10 0.23 - ---------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (0.38) $ 0.83 $ 0.25 $ 0.26 Distributions to shareowners: Net investment income (0.26) (0.16) (0.06) -- Net realized gain (0.15) (0.02) (0.01) -- - ---------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.41) $ (0.18) $ (0.07) $ -- - ---------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (0.79) $ 0.65 $ 0.18 $ 0.26 - ---------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.30 $ 11.09 $ 10.44 $ 10.26 ==================================================================================================== Total return* (3.63)% 8.00% 2.46% 2.60%** Ratio of net expenses to average net assets+++ 1.63% 1.68% 1.68% 1.68%*** Ratio of net investment income to average net assets+++ 2.10% 1.92% 1.48% 1.17%*** Portfolio turnover rate 29% 15% 15% 9%** Net assets, end of period (in thousands) $11,132 $ 9,814 $ 5,201 $ 679 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 1.63% 1.76% 2.80% 45.38%*** Net investment income (loss) 2.10% 1.84% 0.36% (42.53)%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 1.63% 1.68% 1.68% 1.68%*** Net investment income 2.11% 1.92% 1.48% 1.17%*** ==================================================================================================== (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. 52 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Conservative Allocation Fund Year Year 10/5/05(a) Ended Ended To 7/31/08 7/31/07 7/31/06 Class Y Net asset value, beginning of period $ 11.30 $ 10.57 $ 10.32 - ------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income(b) $ 0.28 $ 0.29 $ 0.16 Net realized and unrealized gain (loss) on investments (0.65) 0.65 0.16 - ------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (0.37) $ 0.94 $ 0.32 Distributions to shareowners: Net investment income (0.28) (0.19) (0.06) Net realized gain (0.15) (0.02) (0.01) - ------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.43) $ (0.21) $ (0.07) - ------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.80) $ 0.73 $ 0.25 - ------------------------------------------------------------------------------------------------ Net asset value, end of period $ 10.50 $ 11.30 $ 10.57 ================================================================================================ Total return* (3.42)% 8.91% 3.13%** Ratio of net expenses to average net assets+++ 1.25% 0.90% 1.23%*** Ratio of net investment income to average net assets+++ 2.50% 2.64% 1.96%*** Portfolio turnover rate 29% 15% 15%** Net assets, end of period (in thousands) $ 10 $ 11 $ 10 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 1.25% 0.90% 2.19%*** Net investment income 2.50% 2.64% 0.98%*** Ratios with waivers of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 1.23% 0.88% 1.23%*** Net investment income 2.52% 2.66% 1.96%*** ================================================================================================ (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 53 Financial Highlights (continued) Moderate Allocation Fund Year Year Year 8/9/04(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class A Net asset value, beginning of period $ 12.50 $ 11.39 $ 11.15 $ 10.00 - ------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income(b) $ 0.24 $ 0.21 $ 0.16 $ 0.15 Net realized and unrealized gain (loss) on investments (1.10) 1.21 0.38 1.27 - ------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (0.86) $ 1.42 $ 0.54 $ 1.42 Distributions to shareowners: Net investment income (0.31) (0.28) (0.06) (0.04) Net realized gain (0.44) (0.03) (0.24) (0.23) - ------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.75) $ (0.31) $ (0.30) $ (0.27) - ------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (1.61) $ 1.11 $ 0.24 $ 1.15 - ------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 10.89 $ 12.50 $ 11.39 $ 11.15 ====================================================================================================== Total return* (7.47)% 12.58% 4.98% 14.37%** Ratio of net expenses to average net assets+++ 0.65% 0.65% 0.63% 0.77%*** Ratio of net investment income to average net assets+++ 2.03% 1.75% 1.40% 1.37%*** Portfolio turnover rate 21% 19% 52% 19%** Net assets, end of period (in thousands) $147,004 $165,090 $148,495 $ 32,893 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 0.65% 0.65% 0.63% 1.26%*** Net investment income 2.03% 1.75% 1.40% 0.88%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 0.65% 0.65% 0.63% 0.77%*** Net investment income 2.03% 1.75% 1.40% 1.37%*** ====================================================================================================== (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. 54 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Moderate Allocation Fund Year Year Year 8/9/04(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class B Net asset value, beginning of period $ 11.97 $ 10.92 $ 10.77 $ 10.00 - ----------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income(b) $ 0.13 $ 0.11 $ 0.06 $ 0.02 Net realized and unrealized gain (loss) on investments (1.06) 1.16 0.36 0.98 - ----------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (0.93) $ 1.27 $ 0.42 $ 1.00 Distributions to shareowners: Net investment income (0.21) (0.19) (0.03) -- Net realized gain (0.44) (0.03) (0.24) (0.23) - ----------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.65) $ (0.22) $ (0.27) $ (0.23) - ----------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (1.58) $ 1.05 $ 0.15 $ 0.77 - ----------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.39 $ 11.97 $ 10.92 $ 10.77 ===================================================================================================== Total return* (8.32)% 11.70% 4.00% 10.11%** Ratio of net expenses to average net assets+++ 1.52% 1.50% 1.51% 1.67%*** Ratio of net investment income to average net assets+++ 1.16% 0.91% 0.51% 0.16%*** Portfolio turnover rate 21% 19% 52% 19%** Net assets, end of period (in thousands) $50,515 $ 60,796 $ 55,053 $ 9,781 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 1.52% 1.50% 1.51% 2.08%*** Net investment income (loss) 1.16% 0.91% 0.51% (0.25)%*** Ratios with waivers of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 1.51% 1.49% 1.51% 1.67%*** Net investment income 1.17% 0.92% 0.51% 0.16%*** ===================================================================================================== (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 55 Financial Highlights (continued) Moderate Allocation Fund Year Year Year 8/9/04(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class C Net asset value, beginning of period $ 11.88 $ 10.85 $ 10.68 $ 10.00 - ----------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income(b) $ 0.14 $ 0.12 $ 0.07 $ 0.05 Net realized and unrealized gain (loss) on investments (1.05) 1.15 0.35 0.87 - ----------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (0.91) $ 1.27 $ 0.42 $ 0.92 Distributions to shareowners: Net investment income (0.23) (0.21) (0.01) (0.01) Net realized gain (0.44) (0.03) (0.24) (0.23) - ----------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.67) $ (0.24) $ (0.25) $ (0.24) - ----------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (1.58) $ 1.03 $ 0.17 $ 0.68 - ----------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.30 $ 11.88 $ 10.85 $ 10.68 ===================================================================================================== Total return* (8.19)% 11.83% 4.06% 9.32%** Ratio of net expenses to average net assets+++ 1.39% 1.39% 1.42% 1.67%*** Ratio of net investment income to average net assets+++ 1.28% 1.03% 0.60% 0.44%*** Portfolio turnover rate 21% 19% 52% 19%** Net assets, end of period (in thousands) $45,594 $ 47,405 $ 32,416 $ 15,223 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 1.39% 1.39% 1.42% 2.03%*** Net investment income 1.28% 1.03% 0.60% 0.08%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 1.39% 1.38% 1.42% 1.67%*** Net investment income 1.28% 1.04% 0.60% 0.44%*** ===================================================================================================== (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. 56 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Moderate Allocation Fund Year Year 9/23/05(a) Ended Ended To 7/31/08 7/31/07 7/31/06 Class Y Net asset value, beginning of period $ 12.55 $ 11.43 $ 11.18 - -------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income(b) $ 0.29 $ 0.26 $ 0.17 Net realized and unrealized gain (loss) on investments (1.11) 1.21 0.40 - -------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (0.82) $ 1.47 $ 0.57 Distributions to shareowners: Net investment income (0.35) (0.32) (0.08) Net realized gain (0.44) (0.03) (0.24) - -------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.79) $ (0.35) $ (0.32) - -------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (1.61) $ 1.12 $ 0.25 - -------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.94 $ 12.55 $ 11.43 ================================================================================================== Total return* (7.10)% 12.98% 5.19%** Ratio of net expenses to average net assets+++ 0.27% 0.29% 0.28%*** Ratio of net investment income to average net assets+++ 2.40% 2.09% 1.79%*** Portfolio turnover rate 21% 19% 52%** Net assets, end of period (in thousands) $17,905 $ 24,046 $ 27,792 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 0.27% 0.29% 0.28%*** Net investment income 2.40% 2.09% 1.79%*** Ratios with waivers of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 0.27% 0.29% 0.28%*** Net investment income 2.40% 2.09% 1.79%*** ================================================================================================== (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 57 Financial Highlights (continued) Growth Allocation Fund Year Year Year 8/9/04(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class A Net asset value, beginning of period $ 13.47 $ 12.04 $ 11.50 $ 10.00 - ------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income(b) $ 0.16 $ 0.15 $ 0.09 $ 0.08 Net realized and unrealized gain (loss) on investments (1.41) 1.61 0.63 1.70 - ------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (1.25) $ 1.76 $ 0.72 $ 1.78 Distributions to shareowners: Net investment income (0.25) (0.23) (0.05) (0.03) Net realized gain (0.47) (0.10) (0.13) (0.25) - ------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.72) $ (0.33) $ (0.18) $ (0.28) - ------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (1.97) $ 1.43 $ 0.54 $ 1.50 - ------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 11.50 $ 13.47 $ 12.04 $ 11.50 ====================================================================================================== Total return* (9.88)% 14.73% 6.29% 17.96%** Ratio of net expenses to average net assets+++ 0.78% 0.72% 0.74% 0.81%*** Ratio of net investment income to average net assets+++ 1.24% 1.09% 0.74% 0.69%*** Portfolio turnover rate 20% 11% 27% 2%** Net assets, end of period (in thousands) $139,670 $157,453 $116,161 $ 31,212 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 0.78% 0.72% 0.74% 1.42%*** Net investment income 1.24% 1.09% 0.74% 0.08%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 0.77% 0.71% 0.74% 0.81%*** Net investment income 1.25% 1.10% 0.74% 0.69%*** ====================================================================================================== (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. 58 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Growth Allocation Fund Year Year Year 8/9/04(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class B Net asset value, beginning of period $ 12.17 $ 10.93 $ 10.50 $ 10.00 - -------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (loss)(b) $ 0.05 $ 0.03 $ (0.01) $ 0.01 Net realized and unrealized gain (loss) on investments (1.28) 1.45 0.59 0.74 - -------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (1.23) $ 1.48 $ 0.58 $ 0.75 Distributions to shareowners: Net investment income (0.14) (0.14) (0.02) -- Net realized gain (0.47) (0.10) (0.13) (0.25) - -------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.61) $ (0.24) $ (0.15) $ (0.25) - -------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (1.84) $ 1.24 $ 0.43 $ 0.50 - -------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.33 $ 12.17 $ 10.93 $ 10.50 ======================================================================================================== Total return* (10.66)% 13.67% 5.53% 7.59%** Ratio of net expenses to average net assets+++ 1.58% 1.58% 1.57% 1.71%*** Ratio of net investment income (loss) to average net assets+++ 0.44% 0.23% (0.08)% 0.05%*** Portfolio turnover rate 20% 11% 27% 2%** Net assets, end of period (in thousands) $ 61,704 $ 76,095 $61,373 $ 10,219 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 1.64% 1.60% 1.62% 2.27%*** Net investment income (loss) 0.38% 0.21% (0.13)% (0.51)%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 1.57% 1.57% 1.57% 1.71%*** Net investment income (loss) 0.45% 0.24% (0.08)% 0.05%*** ======================================================================================================== (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 59 Financial Highlights (continued) Growth Allocation Fund Year Year Year 8/9/04(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class C Net asset value, beginning of period $ 12.90 $ 11.58 $ 11.10 $ 10.00 - ------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (loss)(b) $ 0.07 $ 0.05 $ -- $ (0.01) Net realized and unrealized gain (loss) on investments (1.34) 1.53 0.61 1.37 - ------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (1.27) $ 1.58 $ 0.61 $ 1.36 Distributions to shareowners: Net investment income (0.17) (0.16) -- (0.01) Net realized gain (0.47) (0.10) (0.13) (0.25) - ------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.64) $ (0.26) $ (0.13) $ (0.26) - ------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (1.91) $ 1.32 $ 0.48 $ 1.10 - ------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.99 $ 12.90 $ 11.58 $ 11.10 ======================================================================================================= Total return* (10.43)% 13.75% 5.51% 13.67%** Ratio of net expenses to average net assets+++ 1.48% 1.44% 1.46% 1.71%*** Ratio of net investment income (loss) to average net assets+++ 0.54% 0.37% 0.02% (0.07)%*** Portfolio turnover rate 20% 11% 27% 2%** Net assets, end of period (in thousands) $ 47,898 $ 52,861 $ 33,315 $ 14,874 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 1.48% 1.44% 1.46% 2.13%*** Net investment income (loss) 0.54% 0.37% 0.02% (0.49)%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 1.47% 1.43% 1.46% 1.71%*** Net investment income (loss) 0.54% 0.38% 0.02% (0.07)%*** ======================================================================================================= (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. 60 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Growth Allocation Fund Year Year 9/23/05(a) Ended Ended To 7/31/08 7/31/07 7/31/06 Class Y Net asset value, beginning of period $ 13.55 $ 12.13 $ 11.54 - ------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income(b) $ 0.22 $ 0.19 $ 0.13 Net realized and unrealized gain (loss) on investments (1.36) 1.60 0.65 - ------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (1.14) $ 1.79 $ 0.78 Distributions to shareowners: Net investment income (0.30) (0.27) (0.06) Net realized gain (0.47) (0.10) (0.13) - ------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.77) $ (0.37) $ (0.19) - ------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (1.91) $ 1.42 $ 0.59 - ------------------------------------------------------------------------------------------------ Net asset value, end of period $ 11.64 $ 13.55 $ 12.13 ================================================================================================ Total return* (9.05)% 14.87% 6.84%** Ratio of net expenses to average net assets+++ 0.34% 0.36% 0.32%*** Ratio of net investment income to average net assets+++ 1.67% 1.40% 1.23%*** Portfolio turnover rate 20% 11% 27%** Net assets, end of period (in thousands) $ 2,683 $ 2,956 $ 3,068 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 0.34% 0.36% 0.32%*** Net investment income 1.67% 1.40% 1.23%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 0.34% 0.36% 0.32%*** Net investment income 1.67% 1.40% 1.23%*** ================================================================================================ (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 61 Financial Highlights (continued) Aggressive Allocation Fund Year Year Year 8/9/04(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class A Net asset value, beginning of period $ 14.20 $ 12.39 $ 11.82 $ 10.00 - ------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income(b) $ 0.07 $ 0.06 $ 0.01 $ -- Net realized and unrealized gain (loss) on investments (1.69) 1.97 0.85 2.14 - ------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (1.62) $ 2.03 $ 0.86 $ 2.14 Distributions to shareowners: Net investment income (0.23) (0.16) (0.02) -- Net realized gain (0.50) (0.06) (0.27) (0.27) Return of capital -- -- -- (0.05) - ------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.73) $ (0.22) $ (0.29) $ (0.32) - ------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (2.35) $ 1.81 $ 0.57 $ 1.82 - ------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 11.85 $ 14.20 $ 12.39 $ 11.82 ======================================================================================================= Total return* (12.03)% 16.41% 7.30% 21.57%** Ratio of net expenses to average net assets+++ 0.84% 0.82% 0.82% 0.86%*** Ratio of net investment income (loss) to average net assets+++ 0.54% 0.44% 0.10% (0.04)%*** Portfolio turnover rate 13% 18% 51% 3%** Net assets, end of period (in thousands) $102,941 $114,054 $ 84,775 $ 20,689 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 0.84% 0.82% 0.82% 2.14%*** Net investment income (loss) 0.54% 0.44% 0.10% (1.31)%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 0.83% 0.81% 0.82% 0.86%*** Net investment income (loss) 0.55% 0.45% 0.10% (0.04)%*** ======================================================================================================= (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. 62 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Aggressive Allocation Fund Year Year Year 8/9/04(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class B Net asset value, beginning of period $ 13.55 $ 11.84 $ 11.39 $ 10.00 - -------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment loss(b) $ (0.03) $ (0.05) $ (0.08) $ (0.03) Net realized and unrealized gain (loss) on investments (1.61) 1.88 0.80 1.72 - -------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (1.64) $ 1.83 $ 0.72 $ 1.69 Distributions to shareowners: Net investment income (0.12) (0.06) -- -- Net realized gain (0.50) (0.06) (0.27) (0.27) Return of capital -- -- -- (0.03) - -------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.62) $ (0.12) $ (0.27) $ (0.30) - -------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (2.26) $ 1.71 $ 0.45 $ 1.39 - -------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 11.29 $ 13.55 $ 11.84 $ 11.39 ======================================================================================================== Total return* (12.72)% 15.49% 6.36% 17.02%** Ratio of net expenses to average net assets+++ 1.65% 1.66% 1.64% 1.76%*** Ratio of net investment income (loss) to average net assets+++ (0.28)% (0.39)% (0.70)% (0.26)%*** Portfolio turnover rate 13% 18% 51% 3%** Net assets, end of period (in thousands) $ 30,405 $37,749 $30,382 $ 5,845 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 1.71% 1.69% 1.69% 2.81%*** Net investment loss (0.34)% (0.42)% (0.75)% (1.31)%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 1.64% 1.64% 1.64% 1.76%*** Net investment loss (0.27)% (0.38)% (0.70)% (0.26)%*** ======================================================================================================== (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 63 Financial Highlights (continued) Aggressive Allocation Fund Year Year Year 8/9/04(a) Ended Ended Ended To 7/31/08 7/31/07 7/31/06 7/31/05 Class C Net asset value, beginning of period $ 13.73 $ 12.00 $ 11.54 $ 10.00 - -------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment loss(b) $ (0.02) $ (0.03) $ (0.08) $ (0.04) Net realized and unrealized gain (loss) on investments (1.62) 1.90 0.81 1.88 - -------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (1.64) $ 1.87 $ 0.73 $ 1.84 Distributions to shareowners: Net investment income (0.16) (0.08) -- -- Net realized gain (0.50) (0.06) (0.27) (0.27) Return of capital -- -- -- (0.03) - -------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.66) $ (0.14) $ (0.27) $ (0.30) - -------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (2.30) $ 1.73 $ 0.46 $ 1.54 - -------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 11.43 $ 13.73 $ 12.00 $ 11.54 ======================================================================================================== Total return* (12.61)% 15.63% 6.37% 18.52%** Ratio of net expenses to average net assets+++ 1.53% 1.52% 1.56% 1.76%*** Ratio of net investment loss to average net assets+++ (0.16)% (0.26)% (0.64)% (0.39)%*** Portfolio turnover rate 13% 18% 51% 3%** Net assets, end of period (in thousands) $ 22,930 $23,584 $15,524 $ 7,144 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 1.53% 1.52% 1.56% 2.74%*** Net investment loss (0.16)% (0.26)% (0.64)% (1.37)%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 1.52% 1.52% 1.56% 1.76%*** Net investment loss (0.15)% (0.26)% (0.64)% (0.39)%*** ======================================================================================================== (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. 64 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Aggressive Allocation Fund Year Year 9/23/05(a) Ended Ended To 7/31/08 7/31/07 7/31/06 Class Y Net asset value, beginning of period $ 14.26 $ 12.41 $ 11.87 - ------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income(b) $ 0.15 $ 0.14 $ 0.06 Net realized and unrealized gain (loss) on investments (1.60) 1.97 0.78 - ------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (1.45) $ 2.11 $ 0.84 Distributions to shareowners: Net investment income (0.29) (0.20) (0.03) Net realized gain (0.50) (0.06) (0.27) - ------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.79) $ (0.26) $ (0.30) - ------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (2.24) $ 1.85 $ 0.54 - ------------------------------------------------------------------------------------------------ Net asset value, end of period $ 12.02 $ 14.26 $ 12.41 ================================================================================================ Total return* (10.83)% 17.10% 7.13%** Ratio of net expenses to average net assets+++ 0.35% 0.39% 0.37%*** Ratio of net investment income to average net assets+++ 1.06% 1.01% 0.63%*** Portfolio turnover rate 13% 18% 51%** Net assets, end of period (in thousands) $ 3,105 $ 3,171 $ 4,607 Ratios with no waivers of management fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Net expenses 0.35% 0.39% 0.37%*** Net investment income 1.06% 1.01% 0.63%*** Ratios with waiver of management fees and assumption of expenses by PIM and reduction for fees paid indirectly: Net expenses 0.35% 0.39% 0.37%*** Net investment income 1.06% 1.01% 0.63%*** ================================================================================================ (a) Commencement of operations. (b) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 65 Notes to Financial Statements | 7/31/08 1. Organization and Significant Accounting Policies Pioneer Ibbotson Asset Allocation Series (the Trust) is organized as a Delaware statutory trust and is registered with the Securities and Exchange Commission under the Investment Company Act of 1940 (the 1940 Act) as an open-end management investment company. The Trust consists of four separate funds, each issuing four classes of shares (collectively, the Funds, individually, the Fund) as follows: Pioneer Ibbotson Conservative Allocation Fund (Conservative Fund) Pioneer Ibbotson Moderate Allocation Fund (Moderate Fund) Pioneer Ibbotson Growth Allocation Fund (Growth Fund) Pioneer Ibbotson Aggressive Allocation Fund (Aggressive Fund) The investment objective of the Conservative Fund is to seek long-term capital growth and current income. The Moderate Fund seeks long-term capital growth and current income. The Growth Fund seeks long-term capital growth and current income. The Aggressive Fund seeks long-term capital growth. Each Fund is a "fund of funds," which means that it seeks to achieve its investment objective by investing exclusively in other Pioneer Investment funds ("underlying funds") managed by Pioneer Investment Management, Inc. (PIM) rather than by direct investment in securities. In the future, the Funds also may invest in regulated investment companies that are not managed by PIM. The Funds indirectly pay a portion of the expenses incurred by the underlying funds. Consequently, an investment in the Funds entails more direct and indirect expenses than direct investment in the underlying funds. Some of the underlying funds can invest in either high yield securities or small/emerging growth companies. Investments in these types of securities generally are subject to greater volatility than either higher-grade securities or more- established companies in more developed markets, respectively. The Fund's prospectuses contain information regarding the Fund's principal risks. Please refer to those documents when considering the Funds' investment risks. The Board of Trustees has authorized the issuance of four classes of shares, designated as Class A, Class B, Class C and Class Y. Additional classes of shares have been authorized but are not referenced in the Fund's prospectus. The Conservative Allocation Fund Class A, Class B and Class C shares were first offered for sale to the public on May 12, 2005. Class Y shares were first offered for sale to the public on October 5, 2005. The Moderate Allocation, Growth Allocation, and Aggressive Allocation Funds Class A, Class B and Class C shares were first offered for sale to the public on August 9, 2004. Class Y shares of 66 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Moderate Allocation, Growth Allocation, and Aggressive Allocation were first publicly offered on September 23, 2005. Each class of shares represents an interest in the same portfolio of investments of the Fund and has equal rights to voting, redemptions, dividends and liquidation proceeds, except that each class of shares can bear different transfer agent and distribution fees and have exclusive voting rights with respect to the distribution plans that have been adopted by the Class A, Class B and Class C shareowners, respectively. There is no distribution plan for Class Y shares. The financial statements have been prepared in accordance with U.S. generally accepted accounting principles that require the management of the Funds to, among other things, make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from these estimates. The following is a summary of significant accounting policies followed by the Trust in preparation of its financial statements, which are consistent with those policies generally accepted in the investment company industry: A. Security Valuation Security transactions are recorded as of the trade date. The net asset value is computed once daily, on each day the New York Stock Exchange (NYSE) is open, as of the close of regular trading on the NYSE. In computing the net asset value, holdings of mutual fund shares are valued at the net asset value of each fund held. Dividend income and realized capital gain distributions from investment company shares held are recorded on the ex-dividend date. Temporary cash investments are valued at amortized cost which approximates market value. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and Federal income tax purposes. B. Federal Income Taxes It is the Funds' policy to comply with the requirements of the Internal Revenue Service Code applicable to regulated investment companies and to distribute all taxable income and net realized capital gains, if any, to shareholders. Therefore, no Federal income tax provisions are required. All tax returns filed thus far are subject to examination by tax authorities. The amount and characterization of distributions to shareowners for financial reporting purposes is determined in accordance with Federal income tax rules. Therefore, the source of the Funds' distributions may be shown in the accompanying financial statements as either from or in excess of net investment income or net realized gain on investment transactions, or from paid-in capital, depending on the type of book/tax differences that may exist. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 67 At July 31, 2008, the Funds made reclassifications as listed below. These reclassifications have no impact on the net asset values of the respective Funds and are designed to present the Funds' capital accounts on a tax basis. Undistributed Net Accumulated Investment Realized Fund Income (Loss) Gain (Loss) Conservative Allocation Fund $ 144,615 $ (144,615) Moderate Allocation Fund 1,710,948 (1,710,948) Growth Allocation Fund 1,967,082 (1,967,082) Aggressive Allocation Fund 1,787,519 (1,787,519) The tax character of distributions paid during the year ended July 31, 2008 was as follows: Ordinary Long-Term Fund Income Capital Gains Total Conservative Fund $1,194,758 $ 506,817 $1,701,575 Moderate Fund 7,307,685 10,257,984 17,565,669 Growth Fund 5,037,989 10,151,115 15,189,104 Aggressive Fund 2,304,144 6,963,430 9,267,574 The tax character of distributions paid during the year ended July 31, 2007 was as follows: Ordinary Long-Term Fund Income Capital Gains Total Conservative Fund $ 514,160 $ 54,191 $ 568,351 Moderate Fund 6,048,120 702,806 6,750,926 Growth Fund 3,901,473 2,022,290 5,923,763 Aggressive Fund 1,544,770 684,841 2,229,611 The following table shows the components of distributable earnings on a Federal income tax basis at July 31, 2008: Undistributed Undistributed Net Unrealized Ordinary Long-Term Appreciation Fund Income Capital Gains (Depreciation) Conservative Fund $ 594,916 $ 899,672 $ (2,775,854) Moderate Fund 2,097,791 13,460,140 (17,606,106) Growth Fund 530,130 16,501,758 (22,246,837) Aggressive Fund -- 12,460,163 (15,342,173) The difference between book-basis and tax-basis unrealized appreciation is attributable to the tax deferral of losses on wash sales. 68 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 C. Fund Shares The Funds record sales and repurchases of Fund shares as of trade date. Pioneer Funds Distributor, Inc. (PFD), the principal underwriter for the Funds and a wholly owned indirect subsidiary of UniCredit S.p.A. (UniCredit), earned the following in underwriting commissions during the year ended July 31, 2008: Fund Amount Conservative Fund $ 13,484 Moderate Fund $ 94,900 Growth Fund $130,073 Aggressive Fund $ 94,748 D. Class Allocations Income, common expenses and realized and unrealized gains and losses are calculated at the Fund level and allocated daily to each class of shares based on the respective percentage of adjusted net assets at the beginning of the day. Distribution fees are calculated based on the average daily net asset value attributable to Class A, Class B and Class C shares of each Fund, respectively, (see Note 4). Shareowners of each class participate in all expenses and fees paid to the transfer agent, Pioneer Investment Management Shareholder Services, Inc. (PIMSS), for its services, which are allocated based on the number of accounts in each class and the ratable allocation of related out-of-pocket expenses (see Note 3). Distributions to shareowners are recorded as of the ex-dividend date. Distributions paid by each of the Funds with respect to each class of shares are calculated in the same manner, at the same time, and in the same amount, except that Class A, Class B and Class C shares can bear different transfer agent and distribution expense rates. E. Repurchase Agreements With respect to repurchase agreements entered into by the Funds, the value of the underlying securities (collateral), including accrued interest received from counterparties, is required to be at least equal to or in excess of the value of the repurchase agreement at the time of the purchase. The collateral for all repurchase agreements is held in safekeeping in the customer-only account of the Funds' custodian, or subcustodians. The Fund's investment adviser, PIM is responsible for determining that the value of the collateral remains at least equal to the repurchase price. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 69 2. Management Agreement PIM, a wholly owned indirect subsidiary of UniCredit, is the Funds' investment adviser, and manages the Funds' portfolios. Management fees are calculated daily at the following annual rates for each Fund: On assets up to $2.5 billion 0.13% on investments in underlying funds managed by Pioneer (and cash); and 0.17% on other investments On the next $1.5 billion 0.11% on investments in underlying funds managed by Pioneer (and cash); and 0.14% on other investments On the next $1.5 billion 0.10% on investments in underlying funds managed by Pioneer (and cash); and 0.12% on other investments On the next $1.5 billion 0.08% on investments in underlying funds managed by Pioneer (and cash); and 0.10% on other investments Over $7 billion 0.08% on investments in underlying funds managed by Pioneer (and cash); and 0.09% on other investments For each Fund, management fees will be calculated daily at a 0.17% annual rate on any third party managed assets. PIM has entered into a sub-advisory agreement with Ibbotson Associates, LLC. PIM, not the Funds, pays a portion of the fee it receives from each Fund to Ibbotson Associates as compensation for its services to the Funds. In addition, under the management and administration agreements, certain other services and costs, including accounting, regulatory reporting and insurance premiums, are paid by the Funds. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities are the following amounts payable to PIM at July 31, 2008: Fund Amount Conservative Fund $ 5,908 Moderate Fund $ 36,029 Growth Fund $ 34,780 Aggressive Fund $ 21,940 PIM contractually agreed to limit ordinary operating expenses to the extent required to reduce fund expenses, other than underlying fund fees and expenses, as follows. These expense limitations are in effect through December 1, 2009 for Class A shares and through December 1, 2008 for Class B and Class C shares: Fund Class A Class B Class C Conservative Fund 0.78% 1.68% 1.68% Moderate Fund 0.74% 1.52% 1.52% Growth Fund 0.79% 1.57% 1.57% Aggressive Fund 0.85% 1.64% 1.64% 70 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 3. Transfer Agent PIMSS provides substantially all transfer agent and shareowner services to the Funds at negotiated rates. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities are the following amounts of transfer agent fees payable to PIMSS at July 31, 2008: Fund Amount Conservative Fund $ 3,378 Moderate Fund $ 31,288 Growth Fund $ 43,906 Aggressive Fund $ 34,423 4. Distribution Plan The Funds have adopted a Plan of Distribution with respect to Class A, Class B and Class C shares pursuant to Rule 12b-1 of the Investment Company Act of 1940. Pursuant to the Plan, each Fund pays PFD 0.25% of the Fund's average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with respect to Class A shares. Pursuant to the Plan, each Fund pays PFD 1.00% of the average daily net assets attributable to Class B and Class C shares. The fee consists of a 0.25% service fee and a 0.75% distribution fee paid as compensation for personal services and/or account maintenance services or distribution services with regard to Class B and Class C shares. Prior to February 1, 2008, PFD was reimbursed under the Plan for distribution expenses in an amount of up to 0.25% of the average daily net assets attributable to Class A shares. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities are the following amounts relating to distribution and service fees payable to PFD at July 31, 2008. Fund Amount Conservative Fund $ 21,655 Moderate Fund $ 124,364 Growth Fund $ 135,398 Aggressive Fund $ 73,814 In addition, redemptions of each class of shares (except Class Y shares) may be subject to a contingent deferred sales charge (CDSC). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 18 months of purchase. Class B shares that are redeemed within five years of purchase will be subject to a CDSC at declining rates beginning at 4.00%, based on the lower of cost or market value of shares being redeemed. Redemptions of Class C shares within one year of purchase are subject to a CDSC of 1.00% based on the lower of cost or market value of shares being redeemed. For the year ended July 31, 2008, the following CDSC's were paid to PFD: Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 71 Fund Amount Conservative Fund $ 24,295 Moderate Fund $198,075 Growth Fund $258,163 Aggressive Fund $140,134 5. New Pronouncements In September 2006, Statement of Financial Accounting Standards No. 157, Fair Value Measurements (SFAS 157), was issued and is effective for fiscal years beginning after November 15, 2007. SFAS 157 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. Management is currently evaluating the impact the adoption of SFAS 157 will have on the Trust's financial statement disclosures. In March 2008, Statement of Financial Accounting Standards No. 161, Disclosures about Derivative Instruments and Hedging Activities (SFAS 161), was issued and is effective for fiscal years beginning after November 15, 2008. SFAS 161 requires enhanced disclosures about an entity's derivative and hedging activities. Management is currently evaluating the impact the adoption of SFAS 161 will have on the Fund's financial statement disclosures. 72 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Report of Independent Registered Public Accounting Firm To the Board of Trustees and the Shareowners of Pioneer Ibbotson Asset Allocation Series: - -------------------------------------------------------------------------------- We have audited the accompanying statements of assets and liabilities of Pioneer Ibbotson Asset Allocation Series (the "Funds", comprising, respectively, the Pioneer Ibbotson Conservative Allocation Fund, the Pioneer Ibbotson Moderate Allocation Fund, the Pioneer Ibbotson Growth Allocation Fund and the Pioneer Ibbotson Aggressive Allocation Fund), including the schedule of investments, as of July 31, 2008, and the related statements of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the periods indicated therein. These financial statements and financial highlights are the responsibility of the Funds' management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. We were not engaged to perform an audit of the Funds' internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Funds' internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements and financial highlights, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of July 31, 2008 by correspondence with the custodian and transfer agent of the underlying funds. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of each of the respective Funds constituting the Pioneer Ibbotson Asset Allocation Series at July 31, 2008, the results of their operations for the year then ended, the changes in their net assets for each of the two years in the period then ended, and the financial highlights for each of the periods indicated therein, in conformity with U.S. generally accepted accounting principles. /s/ Ernst + Young LLP Boston, Massachusetts September 19, 2008 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 73 ADDITIONAL INFORMATION (unaudited) For the fiscal year ended July 31, 2008, certain dividends paid by the Funds may be subject to a maximum tax rate of 15%, as provided for by the Jobs and Growth Tax Relief Reconciliation Act (the Act) of 2003. The Funds designated up to the maximum amount of such dividends allowable under the Act, as taxed at a maximum rate of 15%. Complete information was computed and reported in conjunction with your 2007 Form 1099-DIV. The qualifying percentage of ordinary income dividends for the purposes of the corporate dividends received deduction was: Moderate Fund 22.80% Growth Fund 36.61% Aggressive Fund 63.14% Conservative Fund 11.13% 74 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Results of Shareholder Meeting (unaudited) Pioneer Ibbotson Conservative Allocation Fund At a special meeting held on May 13, 2008, shareholders of the Fund were asked to consider the proposals described below. A report of the total votes cast by the Fund's shareholders (or, with respect to certain proposals, by shareholders of Pioneer Ibbotson Asset Allocation Series (the "Trust"), as noted below) follows: Broker For Withhold Abstain Non-Votes Proposal 1 -- To elect Trustees* John F. Cogan, Jr. 48,724,502.772 807,620.749 167,021.732 0 Daniel K. Kingsbury 48,832,292.382 699,831.139 167,021.732 0 David R. Bock 48,846,524.332 685,599.190 167,021.732 0 Mary K. Bush 48,753,456.823 778,666.698 167,021.732 0 Benjamin M. Friedman 48,830,008.593 702,114.928 167,021.732 0 Margaret B.W. Graham 48,878,014.128 654,109.394 167,021.732 0 Thomas J. Perna 48,844,326.238 687,386.238 167,432.778 0 Marguerite A. Piret 48,883,176.818 648,946.703 167,021.732 0 John Winthrop 48,856,176.027 675,947.495 167,021.732 0 Broker For Against Abstain Non-Votes Proposal 2 -- To approve an amendment to the Declaration of Trust* 36,248,152.552 1,204,484.356 969,676.344 11,276,832.000 Broker For Against Abstain Non-Votes Proposal 3A -- To approve changes to the Fund's fundamental investment policy relating to borrowing money 1,942,879.497 62,432.240 26,352.000 545,969.000 Proposal 3B -- To approve changes to the Fund's fundamental investment policy relating to underwriting 1,937,041.497 56,670.240 37,952.000 545,969.000 Proposal 3C -- To approve changes to the Fund's fundamental investment policy relating to lending 1,949,868.497 55,443.240 26,352.000 545,969.000 Proposal 3D -- To approve changes to the Fund's fundamental investment policy relating to issuing senior securities 1,946,077.497 47,635.240 37,951.000 545,969.000 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 75 Broker For Against Abstain Non-Votes Proposal 3E -- To approve changes to the Fund's fundamental investment policy relating to real estate 1,936,766.497 56,945.240 37,952.000 545,969.000 Proposal 3F -- To approve changes to the Fund's fundamental investment policy relating to commodities 1,936,766.497 56,945.240 37,952.000 545,969.000 Proposal 3G -- To approve changes to the Fund's fundamental investment policy relating to concentration 1,937,041.497 56,670.240 37,952.000 545,969.000 Proposal 3H -- To approve changes to the Fund's fundamental investment policy relating to diversification 1,938,543.497 55,168.240 37,952.000 545,969.000 Proposal 3I -- To approve the conversion of the Fund's investment objective from fundamental to non- fundamental 1,931,292.497 62,419.240 37,952.000 545,969.000 Broker For Against Abstain Non-Votes Proposal 4 -- To approve an Amended and Restated Management Agreement with PIM 1,947,750.497 45,962.240 37,951.000 545,969.000 * Proposals 1 and 2 were voted on and approved by all series of the Trust. Results reported above reflect the combined votes of all series of the Trust. 76 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Results of Shareholder Meeting (unaudited) Pioneer Ibbotson Moderate Allocation Fund At a special meeting held on May 13, 2008, shareholders of the Fund were asked to consider the proposals described below. A report of the total votes cast by the Fund's shareholders (or, with respect to certain proposals, by shareholders of Pioneer Ibbotson Asset Allocation Series (the "Trust"), as noted below) follows: Broker For Withhold Abstain Non-Votes Proposal 1 -- To elect Trustees* John F. Cogan, Jr. 48,724,502.772 807,620.749 167,021.732 0 Daniel K. Kingsbury 48,832,292.382 699,831.139 167,021.732 0 David R. Bock 48,846,524.332 685,599.190 167,021.732 0 Mary K. Bush 48,753,456.823 778,666.698 167,021.732 0 Benjamin M. Friedman 48,830,008.593 702,114.928 167,021.732 0 Margaret B.W. Graham 48,878,014.128 654,109.394 167,021.732 0 Thomas J. Perna 48,844,326.238 687,386.238 167,432.778 0 Marguerite A. Piret 48,883,176.818 648,946.703 167,021.732 0 John Winthrop 48,856,176.027 675,947.495 167,021.732 0 Broker For Against Abstain Non-Votes Proposal 2 -- To approve an amendment to the Declaration of Trust* 36,248,152.552 1,204,484.356 969,676.344 11,276,832.000 Broker For Against Abstain Non-Votes Proposal 3A -- To approve changes to the Fund's fundamental investment policy relating to borrowing money 13,289,990.071 578,535.979 516,722.687 3,626,475.000 Proposal 3B -- To approve changes to the Fund's fundamental investment policy relating to underwriting 13,488,144.180 382,004.619 515,099.938 3,626,475.000 Proposal 3C -- To approve changes to the Fund's fundamental investment policy relating to lending 13,356,554.719 512,710.080 515,983.938 3,626,475.000 Proposal 3D -- To approve changes to the Fund's fundamental investment policy relating to issuing senior securities 13,363,279.719 498,189.080 523,779.938 3,626,475.000 Proposal 3E -- To approve changes to the Fund's fundamental investment policy relating to real estate 13,472,383.915 376,182.831 536,681.991 3,626,475.000 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 77 Broker For Against Abstain Non-Votes Proposal 3F -- To approve changes to the Fund's fundamental investment policy relating to commodities 13,353,960.272 513,494.528 517,793.938 3,626,475.000 Proposal 3G -- To approve changes to the Fund's fundamental investment policy relating to concentration 13,458,057.132 365,487.740 561,703.865 3,626,475.000 Proposal 3H -- To approve changes to the Fund's fundamental investment policy relating to diversification 13,488,483.177 390,108.873 506,656.687 3,626,475.000 Proposal 3I -- To approve the conversion of the Fund's investment objective from fundamental to non- fundamental 12,510,070.947 1,340,939.799 534,237.991 3,626,475.000 Broker For Against Abstain Non-Votes Proposal 4 -- To approve an Amended and Restated Management Agreement with PIM 13,678,806.035 236,347.135 470,095.567 3,626,475.000 * Proposals 1 and 2 were voted on and approved by all series of the Trust. Results reported above reflect the combined votes of all series of the Trust. 78 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Results of Shareholder Meeting (unaudited) Pioneer Ibbotson Growth Allocation Fund At a special meeting held on May 13, 2008, shareholders of the Fund were asked to consider the proposals described below. A report of the total votes cast by the Fund's shareholders (or, with respect to certain proposals, by shareholders of Pioneer Ibbotson Asset Allocation Series (the "Trust"), as noted below) follows: Broker For Withhold Abstain Non-Votes Proposal 1 -- To elect Trustees* John F. Cogan, Jr. 48,724,502.772 807,620.749 167,021.732 0 Daniel K. Kingsbury 48,832,292.382 699,831.139 167,021.732 0 David R. Bock 48,846,524.332 685,599.190 167,021.732 0 Mary K. Bush 48,753,456.823 778,666.698 167,021.732 0 Benjamin M. Friedman 48,830,008.593 702,114.928 167,021.732 0 Margaret B.W. Graham 48,878,014.128 654,109.394 167,021.732 0 Thomas J. Perna 48,844,326.238 687,386.238 167,432.778 0 Marguerite A. Piret 48,883,176.818 648,946.703 167,021.732 0 John Winthrop 48,856,176.027 675,947.495 167,021.732 0 Broker For Against Abstain Non-Votes Proposal 2 -- To approve an amendment to the Declaration of Trust* 36,248,152.552 1,204,484.356 969,676.344 11,276,832.000 Broker For Against Abstain Non-Votes Proposal 3A -- To approve changes to the Fund's fundamental investment policy relating to borrowing money 13,120,585.470 337,029.125 268,328.913 4,705,631.000 Proposal 3B -- To approve changes to the Fund's fundamental investment policy relating to underwriting 13,144,788.028 312,462.566 268,692.913 4,705,631.000 Proposal 3C -- To approve changes to the Fund's fundamental investment policy relating to lending 13,117,761.429 339,255.166 268,926.913 4,705,631.000 Proposal 3D -- To approve changes to the Fund's fundamental investment policy relating to issuing senior securities 13,126,190.649 332,285.126 267,467.732 4,705,631.000 Proposal 3E -- To approve changes to the Fund's fundamental investment policy relating to real estate 13,159,838.865 303,364.729 262,739.913 4,705,631.000 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 79 Broker For Against Abstain Non-Votes Proposal 3F -- To approve changes to the Fund's fundamental investment policy relating to commodities 13,156,185.376 303,780.218 265,977.913 4,705,631.000 Proposal 3G -- To approve changes to the Fund's fundamental investment policy relating to concentration 12,536,379.121 900,666.056 288,898.331 4,705,631.000 Proposal 3H -- To approve changes to the Fund's fundamental investment policy relating to diversification 12,590,263.681 862,667.913 273,011.913 4,705,631.000 Proposal 3I -- To approve the conversion of the Fund's investment objective from fundamental to non- fundamental 12,481,296.773 962,230.821 282,415.913 4,705,631.000 Broker For Against Abstain Non-Votes Proposal 4 -- To approve an Amended and Restated Management Agreement with PIM 13,173,263.620 283,329.311 269,350.576 4,705,631.000 * Proposals 1 and 2 were voted on and approved by all series of the Trust. Results reported above reflect the combined votes of all series of the Trust. 80 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Results of Shareholder Meeting (unaudited) Pioneer Ibbotson Aggressive Allocation Fund At a special meeting held on May 13, 2008, shareholders of the Fund were asked to consider the proposals described below. A report of the total votes cast by the Fund's shareholders (or, with respect to certain proposals, by shareholders of Pioneer Ibbotson Asset Allocation Series (the "Trust"), as noted below) follows: Broker For Withhold Abstain Non-Votes Proposal 1 -- To elect Trustees* John F. Cogan, Jr. 48,724,502.772 807,620.749 167,021.732 0 Daniel K. Kingsbury 48,832,292.382 699,831.139 167,021.732 0 David R. Bock 48,846,524.332 685,599.190 167,021.732 0 Mary K. Bush 48,753,456.823 778,666.698 167,021.732 0 Benjamin M. Friedman 48,830,008.593 702,114.928 167,021.732 0 Margaret B.W. Graham 48,878,014.128 654,109.394 167,021.732 0 Thomas J. Perna 48,844,326.238 687,386.238 167,432.778 0 Marguerite A. Piret 48,883,176.818 648,946.703 167,021.732 0 John Winthrop 48,856,176.027 675,947.495 167,021.732 0 Broker For Against Abstain Non-Votes Proposal 2 -- To approve an amendment to the Declaration of Trust* 36,248,152.552 1,204,484.356 969,676.344 11,276,832.000 Broker For Against Abstain Non-Votes Proposal 3A -- To approve changes to the Fund's fundamental investment policy relating to borrowing money 7,910,531.739 238,205.869 130,719.664 2,398,757.000 Proposal 3B -- To approve changes to the Fund's fundamental investment policy relating to underwriting 7,924,671.871 233,049.782 121,735.618 2,398,757.000 Proposal 3C -- To approve changes to the Fund's fundamental investment policy relating to lending 7,928,724.556 227,932.097 122,800.618 2,398,757.000 Proposal 3D -- To approve changes to the Fund's fundamental investment policy relating to issuing senior securities 7,928,698.563 228,657.356 122,101.352 2,398,757.000 Proposal 3E -- To approve changes to the Fund's fundamental investment policy relating to real estate 7,916,350.818 228,983.028 134,123.425 2,398,757.000 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 81 Broker For Against Abstain Non-Votes Proposal 3F -- To approve changes to the Fund's fundamental investment policy relating to commodities 7,922,047.126 235,303.793 122,106.352 2,398,757.000 Proposal 3G -- To approve changes to the Fund's fundamental investment policy relating to concentration 7,927,669.429 219,050.178 132,737.664 2,398,757.000 Proposal 3H -- To approve changes to the Fund's fundamental investment policy relating to diversification 7,818,295.843 227,195.631 233,965.796 2,398,757.000 Proposal 3I -- To approve the conversion of the Fund's investment objective from fundamental to non- fundamental 7,739,437.153 412,582.766 127,437.352 2,398,757.000 Broker For Against Abstain Non-Votes Proposal 4 -- To approve an Amended and Restated Management Agreement with PIM 7,823,244.782 223,738.164 232,474.325 2,398,757.000 * Proposals 1 and 2 were voted on and approved by all series of the Trust. Results reported above reflect the combined votes of all series of the Trust. 82 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Approval of Investment Advisory Agreement Pioneer Ibbotson Conservative Allocation Fund Pioneer Investment Management, Inc. (PIM) serves as the Fund's investment adviser pursuant to an investment advisory agreement between PIM and the Fund. The Trustees of the Fund, as required by law, determine annually whether to continue the investment advisory agreement for the Fund. In connection with their most recent consideration of the investment advisory agreement for the Fund, the Trustees received and reviewed a substantial amount of information provided by PIM in response to requests of the independent Trustees and their independent legal counsel. The independent Trustees met on a number of occasions with PIM and also separately with their independent legal counsel to evaluate and discuss the information provided to them by PIM. At a meeting held on November 13, 2007, based on their evaluation of the information provided by PIM, the Trustees, including the independent Trustees voting separately, unanimously approved the continuation of the investment advisory agreement for another year. At a meeting held on January 8, 2008, the Trustees considered whether an amended and restated investment advisory agreement for the Fund should be approved for an initial period ending December 31, 2009. The management fee to be paid by the Fund to PIM under the amended and restated investment advisory agreement is the same as the management fee provided in the previously approved investment advisory agreement. Based on their evaluation of the information provided by PIM, including the information provided by PIM in connection with the Trustees' most recent approval of the continuation of the previous investment advisory agreement, the Trustees, including the independent Trustees voting separately, unanimously approved the amended and restated investment advisory agreement. Shareholders of the Fund approved the amended and restated investment advisory agreement at a meeting held on May 13, 2008. In considering the amended and restated investment advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the amended and restated investment advisory agreement. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that were provided by PIM to the Fund under the previous investment advisory agreement, and that would continue to be provided by PIM to the Fund under the amended and restated investment advisory agreement, taking into account the investment objective and strategy of the Fund and the information related to Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 83 the Fund provided to the Trustees at each quarterly meeting. The Trustees reviewed the terms of the amended and restated investment advisory agreement. The Trustees also reviewed PIM's investment approach for the Fund and its research process. The Trustees considered the resources of PIM and the personnel of PIM who provide investment management services to the Fund. They also considered PIM's compliance and legal resources and personnel. In addition, the Trustees considered the other services that PIM provided under the previous investment advisory agreement and that PIM would continue to provide to the Fund under the amended and restated investment advisory agreement and that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. It was noted that PIM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including officers) as are necessary for the Fund's operations. The Trustees considered the fees paid to PIM for the provision of such services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that PIM would continue to provide to the Fund under the amended and restated investment advisory agreement, were satisfactory and consistent with the terms of the amended and restated investment advisory agreement. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the average performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees noted that the Fund commenced operations on May 12, 2005. They considered that the Fund's annualized total return was in the third quintile of its Morningstar category for the one year period ended June 30, 2007 and that the Fund's total return for 2006 was in the fourth quintile of its Morningstar category. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees concluded that the investment performance of the Fund was satisfactory. Management Fee and Expenses The Trustees considered that the management fee to be paid by the Fund to PIM under the amended and restated investment advisory agreement would be the same as the management fee to be paid by the Fund under the previously approved investment advisory agreement. The Trustees considered information on the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Morningstar and the expense ratios of a peer group of funds selected on the basis of criteria determined by 84 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 the independent Trustees for this purpose using data provided by Strategic Insight Mutual Fund Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2007 was in the second quintile relative to the management fees paid by other funds in its peer group Morningstar category for the comparable period. The Trustees also considered that the Fund's expense ratio for the twelve months ended June 30, 2007 was in the fifth quintile relative to its Strategic Insight peer group. It was noted that PIM did not currently manage any accounts with an investment objective and strategies that were similar to the Fund. The Trustees concluded that the management fee payable by the Fund to PIM was reasonable in relation to the nature and quality of services provided, taking into account the fees charged by other advisers for managing comparable mutual funds with similar strategies. The Trustees also concluded that the Fund's expense ratio was reasonable, taking into account the size of the Fund, the quality of services provided by PIM, the investment performance of the Fund and the contractual expense limitation agreed to by PIM with respect to the Fund. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees recognized that PIM should be entitled to earn a reasonable level of profit for the services provided to the Fund. The Trustees concluded that PIM's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered the economies of scale with respect to the management of the Fund, whether the Fund had appropriately benefited from any economies of scale, and whether there was potential for realization of any further economies of scale. The Trustees considered that, although the Fund pays a management fee at a fixed rate as a percentage of the Fund's net assets, without any breakpoints, the management fee rate paid by the Fund for the twelve months ended June 30, 2007 was in the second quintile relative to the management fees paid by other funds in its peer group Morningstar category for the comparable period. The Trustees also considered the contractual expense limitation agreed to by PIM Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 85 with respect to the Fund and the relatively small size of the Fund compared to its peer group Morningstar category. The Trustees concluded that, at current and reasonably foreseeable asset levels, breakpoints in the management fee were not currently necessary. Other Benefits The Trustees considered the other benefits to PIM from its relationship with the Fund. The Trustees considered that affiliates of PIM serve as the Fund's transfer agent and distributor. The Trustees considered the receipt by PIM and its affiliates of sales loads and payments under Rule 12b-1 plans in respect of the Fund and the other Pioneer funds. The Trustees further considered the intangible benefits to PIM by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between PIM and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the independent Trustees, concluded that the terms of the amended and restated investment advisory agreement between PIM and the Fund, including the fees payable thereunder, were fair and reasonable and voted to approve the amended and restated investment advisory agreement for the Fund. 86 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Approval of Investment Advisory Agreement Pioneer Ibbotson Moderate Allocation Fund Pioneer Investment Management, Inc. (PIM) serves as the Fund's investment adviser pursuant to an investment advisory agreement between PIM and the Fund. The Trustees of the Fund, as required by law, determine annually whether to continue the investment advisory agreement for the Fund. In connection with their most recent consideration of the investment advisory agreement for the Fund, the Trustees received and reviewed a substantial amount of information provided by PIM in response to requests of the independent Trustees and their independent legal counsel. The independent Trustees met on a number of occasions with PIM and also separately with their independent legal counsel to evaluate and discuss the information provided to them by PIM. At a meeting held on November 13, 2007, based on their evaluation of the information provided by PIM, the Trustees, including the independent Trustees voting separately, unanimously approved the continuation of the investment advisory agreement for another year. At a meeting held on January 8, 2008, the Trustees considered whether an amended and restated investment advisory agreement for the Fund should be approved for an initial period ending December 31, 2009. The management fee to be paid by the Fund to PIM under the amended and restated investment advisory agreement is the same as the management fee provided in the previously approved investment advisory agreement. Based on their evaluation of the information provided by PIM, including the information provided by PIM in connection with the Trustees' most recent approval of the continuation of the previous investment advisory agreement, the Trustees, including the independent Trustees voting separately, unanimously approved the amended and restated investment advisory agreement. Shareholders of the Fund approved the amended and restated investment advisory agreement at a meeting held on May 13, 2008. In considering the amended and restated investment advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the amended and restated investment advisory agreement. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that were provided by PIM to the Fund under the previous investment advisory agreement, and that would continue to be provided by PIM to the Fund under the amended and restated investment advisory agreement, taking into account the investment objective and strategy of the Fund and the information related to Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 87 the Fund provided to the Trustees at each quarterly meeting. The Trustees reviewed the terms of the amended and restated investment advisory agreement. The Trustees also reviewed PIM's investment approach for the Fund and its research process. The Trustees considered the resources of PIM and the personnel of PIM who provide investment management services to the Fund. They also considered PIM's compliance and legal resources and personnel. In addition, the Trustees considered the other services that PIM provided under the previous investment advisory agreement and that PIM would continue to provide to the Fund under the amended and restated investment advisory agreement and that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. It was noted that PIM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including officers) as are necessary for the Fund's operations. The Trustees considered the fees paid to PIM for the provision of such services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that PIM would continue to provide to the Fund under the amended and restated investment advisory agreement, were satisfactory and consistent with the terms of the amended and restated investment advisory agreement. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the average performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees noted that the Fund commenced operations on August 9, 2004. They considered that the Fund's annualized total return was in the fourth quintile of its Morningstar category for the one year period ended June 30, 2007 and that the Fund's total return for 2006 was in the fourth quintile of its Morningstar category, while the Fund's total return for 2005 was in the second quintile of its Morningstar category. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) After discussing the reasons for the Fund's short-term underperformance with PIM, and given the short operating history of the Fund, the Trustees concluded that the investment performance of the Fund was satisfactory. Management Fee and Expenses The Trustees considered that the management fee to be paid by the Fund to PIM under the amended and restated investment advisory agreement would be the same as the management fee to be paid by the Fund under the previously 88 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 approved investment advisory agreement. The Trustees considered information on the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Morningstar and the expense ratios of a peer group of funds selected on the basis of criteria determined by the independent Trustees for this purpose using data provided by Strategic Insight Mutual Fund Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2007 was in the second quintile relative to the management fees paid by other funds in its peer group Morningstar category for the comparable period. The Trustees also considered that the Fund's expense ratio for the twelve months ended June 30, 2007 was in the fourth quintile relative to its Strategic Insight peer group. It was noted that PIM did not currently manage any accounts with an investment objective and strategies that were similar to the Fund. The Trustees concluded that the management fee payable by the Fund to PIM was reasonable in relation to the nature and quality of services provided, taking into account the fees charged by other advisers for managing comparable mutual funds with similar strategies. The Trustees also concluded that the Fund's expense ratio was reasonable, taking into account the size of the Fund, the quality of services provided by PIM, the investment performance of the Fund and the contractual expense limitation agreed to by PIM with respect to the Fund. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees recognized that PIM should be entitled to earn a reasonable level of profit for the services provided to the Fund. The Trustees concluded that PIM's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered the economies of scale with respect to the management of the Fund, whether the Fund had appropriately benefited from any economies of scale, and whether there was potential for realization of any further economies of scale. The Trustees considered that, although the Fund pays a management fee at a fixed rate as a percentage of the Fund's net assets, without any breakpoints, the Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 89 management fee rate paid by the Fund for the twelve months ended June 30, 2007 was in the second quintile relative to the management fees paid by other funds in its peer group Morningstar category for the comparable period, and that, on a hypothetical basis, such fee would remain in the second quintile relative to the peer group at higher asset levels. The Trustees also considered the contractual expense limitation agreed to by PIM with respect to the Fund. The Trustees concluded that, at current and reasonably foreseeable asset levels, breakpoints in the management fee were not currently necessary. Other Benefits The Trustees considered the other benefits to PIM from its relationship with the Fund. The Trustees considered that affiliates of PIM serve as the Fund's transfer agent and distributor. The Trustees considered the receipt by PIM and its affiliates of sales loads and payments under Rule 12b-1 plans in respect of the Fund and the other Pioneer funds. The Trustees further considered the intangible benefits to PIM by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between PIM and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the independent Trustees, concluded that the terms of the amended and restated investment advisory agreement between PIM and the Fund, including the fees payable thereunder, were fair and reasonable and voted to approve the amended and restated investment advisory agreement for the Fund. 90 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Approval of Investment Advisory Agreement Pioneer Ibbotson Growth Allocation Fund Pioneer Investment Management, Inc. (PIM) serves as the Fund's investment adviser pursuant to an investment advisory agreement between PIM and the Fund. The Trustees of the Fund, as required by law, determine annually whether to continue the investment advisory agreement for the Fund. In connection with their most recent consideration of the investment advisory agreement for the Fund, the Trustees received and reviewed a substantial amount of information provided by PIM in response to requests of the independent Trustees and their independent legal counsel. The independent Trustees met on a number of occasions with PIM and also separately with their independent legal counsel to evaluate and discuss the information provided to them by PIM. At a meeting held on November 13, 2007, based on their evaluation of the information provided by PIM, the Trustees, including the independent Trustees voting separately, unanimously approved the continuation of the investment advisory agreement for another year. At a meeting held on January 8, 2008, the Trustees considered whether an amended and restated investment advisory agreement for the Fund should be approved for an initial period ending December 31, 2009. The management fee to be paid by the Fund to PIM under the amended and restated investment advisory agreement is the same as the management fee provided in the previously approved investment advisory agreement. Based on their evaluation of the information provided by PIM, including the information provided by PIM in connection with the Trustees' most recent approval of the continuation of the previous investment advisory agreement, the Trustees, including the independent Trustees voting separately, unanimously approved the amended and restated investment advisory agreement. Shareholders of the Fund approved the amended and restated investment advisory agreement at a meeting held on May 13, 2008. In considering the amended and restated investment advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the amended and restated investment advisory agreement. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that were provided by PIM to the Fund under the previous investment advisory agreement, and that would continue to be provided by PIM to the Fund under the amended and restated investment advisory agreement, taking into account the investment objective and strategy of the Fund and the information related to Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 91 the Fund provided to the Trustees at each quarterly meeting. The Trustees reviewed the terms of the amended and restated investment advisory agreement. The Trustees also reviewed PIM's investment approach for the Fund and its research process. The Trustees considered the resources of PIM and the personnel of PIM who provide investment management services to the Fund. They also considered PIM's compliance and legal resources and personnel. In addition, the Trustees considered the other services that PIM provided under the previous investment advisory agreement and that PIM would continue to provide to the Fund under the amended and restated investment advisory agreement and that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. It was noted that PIM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including officers) as are necessary for the Fund's operations. The Trustees considered the fees paid to PIM for the provision of such services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that PIM would continue to provide to the Fund under the amended and restated investment advisory agreement, were satisfactory and consistent with the terms of the amended and restated investment advisory agreement. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the average performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees noted that the Fund commenced operations on August 9, 2004. They considered that the Fund's annualized total return was in the fifth quintile of its Morningstar category for the one year period ended June 30, 2007 and that the Fund's total return for 2006 was in the fourth quintile of its Morningstar category, while the Fund's total return for 2005 was in the second quintile of its Morningstar category. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) After discussing the reasons for the Fund's short-term underperformance with PIM, and given the short operating history of the Fund, the Trustees concluded that the investment performance of the Fund was satisfactory. Management Fee and Expenses The Trustees considered that the management fee to be paid by the Fund to PIM under the amended and restated investment advisory agreement would be the same as the management fee to be paid by the Fund under the previously 92 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 approved investment advisory agreement. The Trustees considered information on the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Morningstar and the expense ratios of a peer group of funds selected on the basis of criteria determined by the independent Trustees for this purpose using data provided by Strategic Insight Mutual Fund Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2007 was in the third quintile relative to the management fees paid by other funds in its peer group Morningstar category for the comparable period. The Trustees also considered that the Fund's expense ratio for the twelve months ended June 30, 2007 was in the fourth quintile relative to its Strategic Insight peer group. It was noted that PIM did not currently manage any accounts with an investment objective and strategies that were similar to the Fund. The Trustees concluded that the management fee payable by the Fund to PIM was reasonable in relation to the nature and quality of services provided, taking into account the fees charged by other advisers for managing comparable mutual funds with similar strategies. The Trustees also concluded that the Fund's expense ratio was reasonable, taking into account the size of the Fund, the quality of services provided by PIM, the investment performance of the Fund and the contractual expense limitation agreed to by PIM with respect to the Fund. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees recognized that PIM should be entitled to earn a reasonable level of profit for the services provided to the Fund. The Trustees concluded that PIM's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered the economies of scale with respect to the management of the Fund, whether the Fund had appropriately benefited from any economies of scale, and whether there was potential for realization of any further economies of scale. The Trustees considered that, although the Fund pays a management fee at a fixed rate as a percentage of the Fund's net assets, without any breakpoints, the Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 93 management fee rate paid by the Fund for the twelve months ended June 30, 2007 was in the third quintile relative to the management fees paid by other funds in its peer group Morningstar category for the comparable period. The Trustees also considered the contractual expense limitation agreed to by PIM with respect to the Fund. The Trustees concluded that, at current and reasonably foreseeable asset levels, breakpoints in the management fee were not currently necessary. Other Benefits The Trustees considered the other benefits to PIM from its relationship with the Fund. The Trustees considered that affiliates of PIM serve as the Fund's transfer agent and distributor. The Trustees considered the receipt by PIM and its affiliates of sales loads and payments under Rule 12b-1 plans in respect of the Fund and the other Pioneer funds. The Trustees further considered the intangible benefits to PIM by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between PIM and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the independent Trustees, concluded that the terms of the amended and restated investment advisory agreement between PIM and the Fund, including the fees payable thereunder, were fair and reasonable and voted to approve the amended and restated investment advisory agreement for the Fund. 94 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Approval of Investment Advisory Agreement Pioneer Ibbotson Aggressive Allocation Fund Pioneer Investment Management, Inc. (PIM) serves as the Fund's investment adviser pursuant to an investment advisory agreement between PIM and the Fund. The Trustees of the Fund, as required by law, determine annually whether to continue the investment advisory agreement for the Fund. In connection with their most recent consideration of the investment advisory agreement for the Fund, the Trustees received and reviewed a substantial amount of information provided by PIM in response to requests of the independent Trustees and their independent legal counsel. The independent Trustees met on a number of occasions with PIM and also separately with their independent legal counsel to evaluate and discuss the information provided to them by PIM. At a meeting held on November 13, 2007, based on their evaluation of the information provided by PIM, the Trustees, including the independent Trustees voting separately, unanimously approved the continuation of the investment advisory agreement for another year. At a meeting held on January 8, 2008, the Trustees considered whether an amended and restated investment advisory agreement for the Fund should be approved for an initial period ending December 31, 2009. The management fee to be paid by the Fund to PIM under the amended and restated investment advisory agreement is the same as the management fee provided in the previously approved investment advisory agreement. Based on their evaluation of the information provided by PIM, including the information provided by PIM in connection with the Trustees' most recent approval of the continuation of the previous investment advisory agreement, the Trustees, including the independent Trustees voting separately, unanimously approved the amended and restated investment advisory agreement. Shareholders of the Fund approved the amended and restated investment advisory agreement at a meeting held on May 13, 2008. In considering the amended and restated investment advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the amended and restated investment advisory agreement. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that were provided by PIM to the Fund under the previous investment advisory agreement, and that would continue to be provided by PIM to the Fund under the amended and restated investment advisory agreement, taking into account the investment objective and strategy of the Fund and the information related to Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 95 the Fund provided to the Trustees at each quarterly meeting. The Trustees reviewed the terms of the amended and restated investment advisory agreement. The Trustees also reviewed PIM's investment approach for the Fund and its research process. The Trustees considered the resources of PIM and the personnel of PIM who provide investment management services to the Fund. They also considered PIM's compliance and legal resources and personnel. In addition, the Trustees considered the other services that PIM provided under the previous investment advisory agreement and that PIM would continue to provide to the Fund under the amended and restated investment advisory agreement and that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. It was noted that PIM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including officers) as are necessary for the Fund's operations. The Trustees considered the fees paid to PIM for the provision of such services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that PIM would continue to provide to the Fund under the amended and restated investment advisory agreement, were satisfactory and consistent with the terms of the amended and restated investment advisory agreement. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the average performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees noted that the Fund commenced operations on August 9, 2004. They considered that the Fund's annualized total return was in the third quintile of its Morningstar category for the one year period ended June 30, 2007 and that the Fund's total return for 2006 was in the third quintile of its Morningstar category, while the Fund's total return for 2005 was in the first quintile of its Morningstar category. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees concluded that the investment performance of the Fund was satisfactory. Management Fee and Expenses The Trustees considered that the management fee to be paid by the Fund to PIM under the amended and restated investment advisory agreement would be the same as the management fee to be paid by the Fund under the previously approved investment advisory agreement. The Trustees considered information on the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Morningstar and the expense 96 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 ratios of a peer group of funds selected on the basis of criteria determined by the independent Trustees for this purpose using data provided by Strategic Insight Mutual Fund Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2007 was in the third quintile relative to the management fees paid by other funds in its peer group Morningstar category for the comparable period. The Trustees also considered that the Fund's expense ratio for the twelve months ended June 30, 2007 was in the fifth quintile relative to its Strategic Insight peer group. It was noted that PIM did not currently manage any accounts with an investment objective and strategies that were similar to the Fund. The Trustees concluded that the management fee payable by the Fund to PIM was reasonable in relation to the nature and quality of services provided, taking into account the fees charged by other advisers for managing comparable mutual funds with similar strategies. The Trustees also concluded that the Fund's expense ratio was reasonable, taking into account the size of the Fund, the quality of services provided by PIM, the investment performance of the Fund and the contractual expense limitation agreed to by PIM with respect to the Fund. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees recognized that PIM should be entitled to earn a reasonable level of profit for the services provided to the Fund. The Trustees concluded that PIM's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered the economies of scale with respect to the management of the Fund, whether the Fund had appropriately benefited from any economies of scale, and whether there was potential for realization of any further economies of scale. The Trustees considered that, although the Fund pays a management fee at a fixed rate as a percentage of the Fund's net assets, without any breakpoints, the management fee rate paid by the Fund for the twelve months ended June 30, 2007 was in the third quintile relative to the management fees paid by other funds in its peer group Morningstar category for the comparable period. The Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 97 Trustees also considered the contractual expense limitation agreed to by PIM with respect to the Fund. The Trustees concluded that, at current and reasonably foreseeable asset levels, breakpoints in the management fee were not currently necessary. Other Benefits The Trustees considered the other benefits to PIM from its relationship with the Fund. The Trustees considered that affiliates of PIM serve as the Fund's transfer agent and distributor. The Trustees considered the receipt by PIM and its affiliates of sales loads and payments under Rule 12b-1 plans in respect of the Fund and the other Pioneer funds. The Trustees further considered the intangible benefits to PIM by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between PIM and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the independent Trustees, concluded that the terms of the amended and restated investment advisory agreement between PIM and the Fund, including the fees payable thereunder, were fair and reasonable and voted to approve the amended and restated investment advisory agreement for the Fund. 98 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Trustees, Officers and Service Providers Investment Adviser Pioneer Investment Management, Inc. Custodian Brown Brothers Harriman & Co. Independent Registered Public Accounting Firm Ernst & Young LLP Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen LLP Shareowner Services and Transfer Agent Pioneer Investment Management Shareholder Services, Inc. Trustees and Officers The Board of Trustees provides broad supervision over the Trust's affairs. The officers of the Trust are responsible for the Trust's operations. The Trustees and officers are listed below, together with their principal occupations during the past five years. Trustees who are interested persons of the Trust within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Trust are referred to as Independent Trustees. Each of the Trustees (except Mr. Bock and Dr. Friedman) serves as a trustee of each of the 77 U.S. registered investment portfolios for which Pioneer serves as investment adviser (the "Pioneer Funds"). Mr. Bock serves as Trustee of 76 of the 77 Pioneer Funds and Dr. Friedman serves on 71 of the 77 Pioneer Funds. The address for all Trustees and all officers of the Trust is 60 State Street, Boston, Massachusetts 02109. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 99 Interested Trustees Position Held Term of Office and Name and Age With the Trust Length of Service John F. Cogan, Jr. (82)* Chairman of the Board, Trustee since 2004. Trustee and President Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- Daniel K. Kingsbury (49)* Trustee and Executive Trustee since May Vice President 2008. Executive Vice President since 2007. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- * Mr. Cogan and Mr. Kingsbury are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. Interested Trustees Other Directorships Name and Age Principal Occupation During Past Five Years Held by this Trustee John F. Cogan, Jr. (82)* Deputy Chairman and a Director of Pioneer Global Asset Man- None agement S.p.A. ("PGAM"); Non-Executive Chairman and a Direc- tor of Pioneer Investment Management USA Inc. ("PIM-USA"); Chairman and a Director of Pioneer; Chairman and Director of Pioneer Institutional Asset Management, Inc. (since 2006); Director of Pioneer Alternative Investment Management Limited (Dublin); President and a Director of Pioneer Alternative Invest- ment Management (Bermuda) Limited and affiliated funds; Director of PIOGLOBAL Real Estate Investment Fund (Russia) (until June 2006); Director of Nano-C, Inc. (since 2003); Director of Cole Management Inc. (since 2004); Director of Fiduciary Counseling, Inc.; President and Director of Pioneer Funds Dis- tributor, Inc. ("PFD") (until May 2006); President of all of the Pioneer Funds; and Of Counsel, Wilmer Cutler Pickering Hale and Dorr LLP - ------------------------------------------------------------------------------------------------------------------------------------ Daniel K. Kingsbury (49)* Director, CEO and President of Pioneer Investment Management None USA Inc. (since February 2007); Director and President of Pioneer Investment Management, Inc. and Pioneer Institutional Asset Management, Inc. (since February 2007); Executive Vice President of all of the Pioneer Funds (since March 2007); Direc- tor of Pioneer Global Asset Management S.p.A. (since April 2007); Head of New Markets Division, Pioneer Global Asset Man- agement S.p.A. (2000 - 2007) - ------------------------------------------------------------------------------------------------------------------------------------ * Mr. Cogan and Mr. Kingsbury are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. 100 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Independent Trustees Position Held Term of Office and Name and Age With the Trust Length of Service David R. Bock (64) Trustee Trustee since 2005. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- Mary K. Bush (60) Trustee Trustee since 2004. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- Other Directorships Name and Age Principal Occupation During Past Five Years Held by this Trustee David R. Bock (64) Executive Vice President and Chief Financial Officer, I-trax, Inc. Director of Enterprise Com- (publicly traded health care services company) (2004 - 2007); munity Investment, Inc. Partner, Federal City Capital Advisors (boutique merchant bank) (privately-held affordable (1997 to 2004 and 2008 -- present); and Executive Vice Presi- housing finance company); dent and Chief Financial Officer, Pedestal Inc. (internet-based and Director of New York mortgage trading company) (2000 - 2002) Mortgage Trust (publicly traded mortgage REIT) - ------------------------------------------------------------------------------------------------------------------------------------ Mary K. Bush (60) President, Bush International, LLC (international financial advi- Director of Marriott Inter- sory firm) national, Inc., Director of Discover Financial Services (credit card issuer and elec- tronic payment services); Director of Briggs & Stratton Co. (engine manufacturer); Director of UAL Corporation (airline holding company) Director of Mantech Interna- tional Corporation (national security, defense, and intelligence technology firm); and Member, Board of Governors, Investment Company Institute - ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 101 Independent Trustees (continued) Position Held Term of Office and Name and Age With the Trust Length of Service Benjamin M. Friedman (63) Trustee Trustee since May, 2008. Serves until a successor trustee is elected or earlier retire- ment or removal - -------------------------------------------------------------------------------- Margaret B.W. Graham (61) Trustee Trustee since 2004. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- Thomas J. Perna (57) Trustee Trustee since 2006. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- Marguerite A. Piret (60) Trustee Trustee since 2004. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- John Winthrop (72) Trustee Trustee since 2004. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- Other Directorships Name and Age Principal Occupation During Past Five Years Held by this Trustee Benjamin M. Friedman (63) Professor, Harvard University Trustee, Mellon Institutional Funds Investment Trust and Mellon Institutional Funds Master Portfolio (oversees 17 portfolios in fund complex) - ------------------------------------------------------------------------------------------------------------------------------------ Margaret B.W. Graham (61) Founding Director, Vice-President and Corporate Secretary, The None Winthrop Group, Inc. (consulting firm); and Desautels Faculty of Management, McGill University - ------------------------------------------------------------------------------------------------------------------------------------ Thomas J. Perna (57) Private investor (2004 - present); and Senior Executive Vice Director of Quadriserv Inc. President, The Bank of New York (financial and securities ser- (technology products for vices) (1986 - 2004) securities lending industry) - ------------------------------------------------------------------------------------------------------------------------------------ Marguerite A. Piret (60) President and Chief Executive Officer, Newbury, Piret & Company, Director of New America Inc. (investment banking firm) High Income Fund, Inc. (closed-end investment company) - ------------------------------------------------------------------------------------------------------------------------------------ John Winthrop (72) President, John Winthrop & Co., Inc. (private investment firm) None - ------------------------------------------------------------------------------------------------------------------------------------ 102 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 Trust Officers Positions Held Length of Service Name and Age With the Trust and Term of Office Dorothy E. Bourassa (60) Secretary Since 2004. Serves at the discretion of the Board - -------------------------------------------------------------------------------- Christopher J. Kelley (43) Assistant Secretary Since 2004. Serves at the discretion of the Board - -------------------------------------------------------------------------------- Mark E. Bradley (48) Treasurer Since March 2008. Serves at the discretion of the Board - -------------------------------------------------------------------------------- Luis I. Presutti (43) Assistant Treasurer Since 2004. Serves at the discretion of the Board - -------------------------------------------------------------------------------- Gary Sullivan (50) Assistant Treasurer Since 2004. Serves at the discretion of the Board - -------------------------------------------------------------------------------- Trust Officers Other Directorships Name and Age Principal Occupation During Past Five Years Held by this Officer Dorothy E. Bourassa (60) Secretary of PIM-USA; Senior Vice President - Legal of Pioneer; None Secretary/Clerk of most of PIM-USA's subsidiaries; and Secretary of all of the Pioneer Funds since September 2003 (Assistant Secretary from November 2000 to September 2003) - ------------------------------------------------------------------------------------------------------------------------------------ Christopher J. Kelley (43) Associate General Counsel of Pioneer since January 2008 and None Assistant Secretary of all of the Pioneer Funds since September 2003; Vice President and Senior Counsel of Pioneer from July 2002 to December 2007 - ------------------------------------------------------------------------------------------------------------------------------------ Mark E. Bradley (48) Vice President - Fund Accounting, Administration and Controller- None ship Services of Pioneer; and Treasurer of all of the Pioneer Funds since March 2008; Deputy Treasurer of Pioneer from March 2004 to February 2008; Assistant Treasurer of all of the Pioneer Funds from March 2004 to February 2008; and Treasurer and Senior Vice President, CDC IXIS Asset Management Services from 2002 to 2003 - ------------------------------------------------------------------------------------------------------------------------------------ Luis I. Presutti (43) Assistant Vice President - Fund Accounting, Administration and None Controllership Services of Pioneer; and Assistant Treasurer of all of the Pioneer Funds - ------------------------------------------------------------------------------------------------------------------------------------ Gary Sullivan (50) Fund Accounting Manager - Fund Accounting, Administration and None Controllership Services of Pioneer; and Assistant Treasurer of all of the Pioneer Funds - ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 103 Trust Officers (continued) Positions Held Length of Service Name and Age With the Trust and Term of Office Katherine Kim Sullivan (34) Assistant Treasurer Since 2004. Serves at the discretion of the Board - -------------------------------------------------------------------------------- Teri W. Anderholm (48) Chief Compliance Since January 2007. Officer Serves at the discretion of the Board - -------------------------------------------------------------------------------- Other Directorships Name and Age Principal Occupation During Past Five Years Held by this Officer Katherine Kim Sullivan (34) Fund Administration Manager - Fund Accounting, Administration None and Controllership Services since June 2003 and Assistant Treasurer of all of the Pioneer Funds since September 2003; Assistant Vice President - Mutual Fund Operations of State Street Corporation from June 2002 to June 2003 (formerly Deutsche Bank Asset Management) - ------------------------------------------------------------------------------------------------------------------------------------ Teri W. Anderholm (48) Chief Compliance Officer of Pioneer since December 2006 and of None all the Pioneer Funds since January 2007; Vice President and Compliance Officer, MFS Investment Management (August 2005 to December 2006); Consultant, Fidelity Investments (February 2005 to July 2005); Independent Consultant (July 1997 to February 2005) - ------------------------------------------------------------------------------------------------------------------------------------ 104 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 This page for your notes. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 105 This page for your notes. 106 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 This page for your notes. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 107 This page for your notes. 108 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 This page for your notes. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 109 This page for your notes. 110 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 This page for your notes. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 111 This page for your notes. 112 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 This page for your notes. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 113 This page for your notes. 114 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 This page for your notes. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 115 This page for your notes. 116 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/08 How to Contact Pioneer We are pleased to offer a variety of convenient ways for you to contact us for assistance or information. Call us for: - -------------------------------------------------------------------------------- Account Information, including existing accounts, new accounts, prospectuses, applications and service forms 1-800-225-6292 FactFone(SM) for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Telecommunications Device for the Deaf (TDD) 1-800-225-1997 Write to us: - -------------------------------------------------------------------------------- PIMSS P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address ask.pioneer@pioneerinvestments.com (for general questions about Pioneer only) Visit our website: www.pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete statement of investments with the Securities and Exchange Commission for the first and third quarters for each fiscal year on Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's web site at sec.gov. The filed form may also be viewed and copied at the Commission's Public Reference Room in Washington, DC. Information regarding the operations of the Public Reference Room may be obtained by calling 1-800-SEC-0330. ITEM 2. CODE OF ETHICS. (a) Disclose whether, as of the end of the period covered by the report, the registrant has adopted a code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party. If the registrant has not adopted such a code of ethics, explain why it has not done so. The registrant has adopted, as of the end of the period covered by this report, a code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer and controller. (b) For purposes of this Item, the term "code of ethics" means written standards that are reasonably designed to deter wrongdoing and to promote: (1) Honest and ethical conduct, including the ethical handling of actual or apparent conflicts of interest between personal and professional relationships; (2) Full, fair, accurate, timely, and understandable disclosure in reports and documents that a registrant files with, or submits to, the Commission and in other public communications made by the registrant; (3) Compliance with applicable governmental laws, rules, and regulations; (4) The prompt internal reporting of violations of the code to an appropriate person or persons identified in the code; and (5) Accountability for adherence to the code. (c) The registrant must briefly describe the nature of any amendment, during the period covered by the report, to a provision of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party, and that relates to any element of the code of ethics definition enumerated in paragraph (b) of this Item. The registrant must file a copy of any such amendment as an exhibit pursuant to Item 10(a), unless the registrant has elected to satisfy paragraph (f) of this Item by posting its code of ethics on its website pursuant to paragraph (f)(2) of this Item, or by undertaking to provide its code of ethics to any person without charge, upon request, pursuant to paragraph (f)(3) of this Item. The registrant has made no amendments to the code of ethics during the period covered by this report. (d) If the registrant has, during the period covered by the report, granted a waiver, including an implicit waiver, from a provision of the code of ethics to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party, that relates to one or more of the items set forth in paragraph (b) of this Item, the registrant must briefly describe the nature of the waiver, the name of the person to whom the waiver was granted, and the date of the waiver. Not applicable. (e) If the registrant intends to satisfy the disclosure requirement under paragraph (c) or (d) of this Item regarding an amendment to, or a waiver from, a provision of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions and that relates to any element of the code of ethics definition enumerated in paragraph (b) of this Item by posting such information on its Internet website, disclose the registrant's Internet address and such intention. Not applicable. (f) The registrant must: (1) File with the Commission, pursuant to Item 10(a), a copy of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, as an exhibit to its annual report on this Form N-CSR; (2) Post the text of such code of ethics on its Internet website and disclose, in its most recent report on this Form N-CSR, its Internet address and the fact that it has posted such code of ethics on its Internet website; or (3) Undertake in its most recent report on this Form N-CSR to provide to any person without charge, upon request, a copy of such code of ethics and explain the manner in which such request may be made. 	See Item 10(2) ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. (a) (1) Disclose that the registrant's board of trustees has determined that the registrant either: (i) Has at least one audit committee financial expert serving on its audit committee; or (ii) Does not have an audit committee financial expert serving on its audit committee. The registrant's Board of Trustees has determined that the registrant has at least one audit committee financial expert. (2) If the registrant provides the disclosure required by paragraph (a)(1)(i) of this Item, it must disclose the name of the audit committee financial expert and whether that person is "independent." In order to be considered "independent" for purposes of this Item, a member of an audit committee may not, other than in his or her capacity as a member of the audit committee, the board of trustees, or any other board committee: (i) Accept directly or indirectly any consulting, advisory, or other compensatory fee from the issuer; or (ii) Be an "interested person" of the investment company as defined in Section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19)). Ms. Marguerite A. Piret, an independent trustee, is such an audit committee financial expert. (3) If the registrant provides the disclosure required by paragraph (a)(1) (ii) of this Item, it must explain why it does not have an audit committee financial expert. Not applicable. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. (a) Disclose, under the caption AUDIT FEES, the aggregate fees billed for each of the last two fiscal years for professional services rendered by the principal accountant for the audit of the registrant's annual financial statements or services that are normally provided by the accountant in connection with statutory and regulatory filings or engagements for those fiscal years. Audit Fees Fees for audit services provided to the Series, including fees associated with the filings of its Form N-1A, totaled approximately $142,000 in 2008 and approximately $136,700 in 2007. (b) Disclose, under the caption AUDIT-RELATED FEES, the aggregate fees billed in each of the last two fiscal years for assurance and related services by the principal accountant that are reasonably related to the performance of the audit of the registrant's financial statements and are not reported under paragraph (a) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. Audit-Related Fees There were no audit-related services in 2008 or 2007. (c) Disclose, under the caption TAX FEES, the aggregate fees billed in each of the last two fiscal years for professional services rendered by the principal accountant for tax compliance, tax advice, and tax planning. Registrants shall describe the nature of the services comprising the fees disclosed under this category. Tax Fees Fees for tax compliance services, primarily for tax returns, totaled $33,160 in 2008 and $31,280 in 2007. (d) Disclose, under the caption ALL OTHER FEES, the aggregate fees billed in each of the last two fiscal years for products and services provided by the principal accountant, other than the services reported in paragraphs (a) through (c) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. Other Fees There were no other services provided to the Series during the fiscal years ended July 31, 2008 and 2007. (e) (1) Disclose the audit committee's pre-approval policies and procedures described in paragraph (c)(7) of Rule 2-01 of Regulation S-X. PIONEER FUNDS APPROVAL OF AUDIT, AUDIT-RELATED, TAX AND OTHER SERVICES PROVIDED BY THE INDEPENDENT AUDITOR SECTION I - POLICY PURPOSE AND APPLICABILITY The Pioneer Funds recognize the importance of maintaining the independence of their outside auditors. Maintaining independence is a shared responsibility involving Pioneer Investment Management, Inc ("PIM"), the audit committee and the independent auditors. The Funds recognize that a Fund's independent auditors: 1) possess knowledge of the Funds, 2) are able to incorporate certain services into the scope of the audit, thereby avoiding redundant work, cost and disruption of Fund personnel and processes, and 3) have expertise that has value to the Funds. As a result, there are situations where it is desirable to use the Fund's independent auditors for services in addition to the annual audit and where the potential for conflicts of interests are minimal. Consequently, this policy, which is intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and procedures to be followed by the Funds when retaining the independent audit firm to perform audit, audit-related tax and other services under those circumstances, while also maintaining independence. Approval of a service in accordance with this policy for a Fund shall also constitute approval for any other Fund whose pre-approval is required pursuant to Rule 210.2-01(c)(7)(ii). In addition to the procedures set forth in this policy, any non-audit services that may be provided consistently with Rule 210.2-01 may be approved by the Audit Committee itself and any pre-approval that may be waived in accordance with Rule 210.2-01(c)(7)(i)(C) is hereby waived. Selection of a Fund's independent auditors and their compensation shall be determined by the Audit Committee and shall not be subject to this policy. SECTION II - POLICY - ---------------- -------------------------------- ------------------------------------------------- SERVICE SERVICE CATEGORY DESCRIPTION SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES CATEGORY - ---------------- -------------------------------- ------------------------------------------------- I. AUDIT Services that are directly o Accounting research assistance SERVICES related to performing the o SEC consultation, registration independent audit of the Funds statements, and reporting o Tax accrual related matters o Implementation of new accounting standards o Compliance letters (e.g. rating agency letters) o Regulatory reviews and assistance regarding financial matters o Semi-annual reviews (if requested) o Comfort letters for closed end offerings - ---------------- -------------------------------- ------------------------------------------------- II. Services which are not o AICPA attest and agreed-upon procedures AUDIT-RELATED prohibited under Rule o Technology control assessments SERVICES 210.2-01(C)(4) (the "Rule") o Financial reporting control assessments and are related extensions of o Enterprise security architecture the audit services support the assessment audit, or use the knowledge/expertise gained from the audit procedures as a foundation to complete the project. In most cases, if the Audit-Related Services are not performed by the Audit firm, the scope of the Audit Services would likely increase. The Services are typically well-defined and governed by accounting professional standards (AICPA, SEC, etc.) - ---------------- -------------------------------- ------------------------------------------------- ------------------------------------- ------------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the audit period for all services and related fees pre-approved specific service reported at each regularly subcategories. Approval of the scheduled Audit Committee independent auditors as meeting. auditors for a Fund shall constitute pre approval for these services. ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the fund fiscal year within services and related fees a specified dollar limit (including comparison to for all pre-approved specified dollar limits) specific service subcategories reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limit for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for Audit-Related Services not denoted as "pre-approved", or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------------------ SECTION III - POLICY DETAIL, CONTINUED - ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION - ----------------------- --------------------------- ----------------------------------------------- III. TAX SERVICES Services which are not o Tax planning and support prohibited by the Rule, o Tax controversy assistance if an officer of the Fund o Tax compliance, tax returns, excise determines that using the tax returns and support Fund's auditor to provide o Tax opinions these services creates significant synergy in the form of efficiency, minimized disruption, or the ability to maintain a desired level of confidentiality. - ----------------------- --------------------------- ----------------------------------------------- - ------------------------------------- ------------------------- AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY - ------------------------------------- ------------------------- - ------------------------------------- ------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year all such services and within a specified dollar limit related fees 				 (including comparison 			 to specified dollar 			 limits) reported 			 quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for tax services not denoted as pre-approved, or to add a specific service subcategory as "pre-approved" - ------------------------------------- ------------------------- SECTION III - POLICY DETAIL, CONTINUED - ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION - ----------------------- --------------------------- ----------------------------------------------- IV. OTHER SERVICES Services which are not o Business Risk Management support prohibited by the Rule, o Other control and regulatory A. SYNERGISTIC, if an officer of the Fund compliance projects UNIQUE QUALIFICATIONS determines that using the Fund's auditor to provide these services creates significant synergy in the form of efficiency, minimized disruption, the ability to maintain a desired level of confidentiality, or where the Fund's auditors posses unique or superior qualifications to provide these services, resulting in superior value and results for the Fund. - ----------------------- --------------------------- ----------------------------------------------- - --------------------------------------- ------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY - ------------------------------------- -------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year within all such services and a specified dollar limit related fees 			 (including comparison 			 to specified dollar 				 limits) reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for "Synergistic" or "Unique Qualifications" Other Services not denoted as pre-approved to the left, or to add a specific service subcategory as "pre-approved" - ------------------------------------- -------------------------- SECTION III - POLICY DETAIL, CONTINUED - ----------------------- ------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PROHIBITED SERVICE SUBCATEGORIES DESCRIPTION - ----------------------- ------------------------- ----------------------------------------------- PROHIBITED SERVICES Services which result 1. Bookkeeping or other services in the auditors losing related to the accounting records or independence status financial statements of the audit under the Rule. client* 2. Financial information systems design and implementation* 3. Appraisal or valuation services, fairness* opinions, or contribution-in-kind reports 4. Actuarial services (i.e., setting actuarial reserves versus actuarial audit work)* 5. Internal audit outsourcing services* 6. Management functions or human resources 7. Broker or dealer, investment advisor, or investment banking services 8. Legal services and expert services unrelated to the audit 9. Any other service that the Public Company Accounting Oversight Board determines, by regulation, is impermissible - ----------------------- ------------------------- ----------------------------------------------- - ------------------------------------------- ------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY - ------------------------------------------- ------------------------------ o These services are not to be o A summary of all performed with the exception of the(*) services and related services that may be permitted fees reported at each if they would not be subject to audit regularly scheduled procedures at the audit client (as Audit Committee meeting defined in rule 2-01(f)(4)) level will serve as continual the firm providing the service. confirmation that has 				 not provided any restricted services. - ------------------------------------------- ------------------------------ - -------------------------------------------------------------------------------- GENERAL AUDIT COMMITTEE APPROVAL POLICY: o For all projects, the officers of the Funds and the Fund's auditors will each make an assessment to determine that any proposed projects will not impair independence. o Potential services will be classified into the four non-restricted service categories and the "Approval of Audit, Audit-Related, Tax and Other Services" Policy above will be applied. Any services outside the specific pre-approved service subcategories set forth above must be specifically approved by the Audit Committee. o At least quarterly, the Audit Committee shall review a report summarizing the services by service category, including fees, provided by the Audit firm as set forth in the above policy. - -------------------------------------------------------------------------------- (2) Disclose the percentage of services described in each of paragraphs (b) through (d) of this Item that were approved by the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X. Non-Audit Services Beginning with non-audit service contracts entered into on or after May 6, 2003, the effective date of the new SEC pre- approval rules, the Fund's audit committee is required to pre- approve services to affiliates defined by SEC rules to the extent that the services are determined to have a direct impact on the operations or financial reporting of the Fund. For the years ended July 31, 2008 and 2007, there were no services provided to an affiliate that required the Fund's audit committee pre-approval. (f) If greater than 50 percent, disclose the percentage of hours expended on the principal accountant's engagement to audit the registrant's financial statements for the most recent fiscal year that were attributed to work performed by persons other than the principal accountant's full-time, permanent employees. N/A (g) Disclose the aggregate non-audit fees billed by the registrant's accountant for services rendered to the registrant, and rendered to the registrant's investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for each of the last two fiscal years of the registrant. Aggregate Non-Audit Fees The aggregate non-audit fees for the Fund and affiliates, as previously defined, totaled approximately $33,160 in 2007 and $31,280 in 2006. (h) Disclose whether the registrant's audit committee of the board of trustees has considered whether the provision of non-audit services that were rendered to the registrant's investment adviser (not including any subadviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. The Fund's audit committee of the Board of Trustees has considered whether the provision of non-audit services that were rendered to the Affiliates (as defined) that were not pre- approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. Item 5. Audit Committee of Listed Registrants (a) If the registrant is a listed issuer as defined in Rule 10A-3 under the Exchange Act (17 CFR 240.10A-3), state whether or not the registrant has a separately-designated standing audit committee established in accordance with Section 3(a)(58)(A) of the Exchange Act (15 U.S.C. 78c(a)(58)(A)). If the registrant has such a committee, however designated, identify each committee member. If the entire board of directors is acting as the registrants audit committee as specified in Section 3(a)(58)(B) of the Exchange Act (15 U.S.C. 78c(a)(58)(B)), so state. N/A (b) If applicable, provide the disclosure required by Rule 10A-3(d) under the Exchange Act (17 CFR 240.10A-3(d)) regarding an exemption from the listing standards for audit committees. N/A Item 6. Schedule of Investments. File Schedule I Investments in securities of unaffiliated issuers as of the close of the reporting period as set forth in 210.12- 12 of Regulation S-X [17 CFR 210.12-12], unless the schedule is included as part of the report to shareholders filed under Item 1 of this Form. Included in Item 1 ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES. A closed-end management investment company that is filing an annual report on this Form N-CSR must, unless it invests exclusively in non-voting securities, describe the policies and procedures that it uses to determine how to vote proxies relating to portfolio securities, including the procedures that the company uses when a vote presents a conflict between the interests of its shareholders, on the one hand, and those of the company's investment adviser; principal underwriter; or any affiliated person (as defined in Section 2(a)(3) of the Investment Company Act of 1940 (15 U.S.C. 80a-2(a)(3)) and the rules thereunder) of the company, its investment adviser, or its principal underwriter, on the other. Include any policies and procedures of the company's investment adviser, or any other third party, that the company uses, or that are used on the company's behalf, to determine how to vote proxies relating to portfolio securities. Not applicable to open-end management investment companies. Item 8. Portfolio Managers of Closed-End Management Investment Companies. (a) If the registrant is a closed-end management investment company that is filing an annual report on this Form N-CSR,provide the following information: (1) State the name, title, and length of service of the person or persons employed by or associated with the registrant or an investment adviser of the registrant who are primarily responsible for the day-to-day management of the registrants portfolio (Portfolio Manager). Also state each Portfolio Managers business experience during the past 5 years. Not applicable to open-end management investment companies. Item 9. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers. (a) If the registrant is a closed-end management investment company, in the following tabular format, provide the information specified in paragraph (b) of this Item with respect to any purchase made by or on behalf of the registrant or any affiliated purchaser, as defined in Rule 10b-18(a)(3) under the Exchange Act (17 CFR 240.10b-18(a)(3)), of shares or other units of any class of the registrants equity securities that is registered by the registrant pursuant to Section 12 of the Exchange Act (15 U.S.C. 781). Instruction to paragraph (a). Disclose all purchases covered by this Item, including purchases that do not satisfy the conditions of the safe harbor of Rule 10b-18 under the Exchange Act (17 CFR 240.10b-18), made in the period covered by the report. Provide disclosures covering repurchases made on a monthly basis. For example, if the reporting period began on January 16 and ended on July 15, the chart would show repurchases for the months from January 16 through February 15, February 16 through March 15, March 16 through April 15, April 16 through May 15, May 16 through June 15, and June 16 through July 15. Not applicable to open-end management investment companies. Item 10. Submission of Matters to a Vote of Security Holders. Describe any material changes to the procedures by which shareholders may recommend nominees to the registrants board of directors, where those changes were implemented after the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14A (17 CFR 240.14a-101), or this Item. There have been no material changes to the procedures by which the shareholders may recommend nominees to the registrants board of directors since the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14(A) in its definitive proxy statement, or this Item. ITEM 11. CONTROLS AND PROCEDURES. (a) Disclose the conclusions of the registrant's principal executive officer or officers and principal financial officer or officers, or persons performing similar functions, about the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-2(c) under the Act (17 CFR 270.30a-2(c))) based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph. The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report. (b) Disclose whether or not there were significant changes in the registrant's internal controls or in other factors that could significantly affect these controls subsequent to the date of their evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses. There were no significant changes in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. The registrant's principal executive officer and principal financial officer, however, voluntarily are reporting the following information: In August of 2006 the registrant's investment adviser enhanced its internal procedures for reporting performance information required to be included in prospectuses. Those enhancements involved additional internal controls over the appropriateness of performance data generated for this purpose. Such enhancements were made following an internal review which identified prospectuses relating to certain classes of shares of a limited number of registrants where, inadvertently, performance information not reflecting the deduction of applicable sales charges was included. Those prospectuses were revised, and the revised prospectuses were distributed to shareholders. ITEM 12. EXHIBITS. File the exhibits listed below as part of this Form. Letter or number the exhibits in the sequence indicated. (a) Any code of ethics, or amendment thereto, that is the subject of the disclosure required by Item 2, to the extent that the registrant intends to satisfy the Item 2 requirements through filing of an exhibit. (b) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2 under the Act (17 CFR 270.30a-2). Filed herewith. SIGNATURES [See General Instruction F] Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. (Registrant) Pioneer Ibbotson Asset Allocation Series By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr, President Date September 29, 2008 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr., President Date September 29, 2008 By (Signature and Title)* /s/ Mark Bradley Mark Bradley, Treasurer Date September 29, 2008 * Print the name and title of each signing officer under his or her signature.