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: 811-07510 ACM Municipal Securities Income Fund, Inc. (Exact name of registrant as specified in charter) 1345 Avenue of the Americas, New York, New York 10105 (Address of principal executive offices) (Zip code) Edmund P. Bergan, Jr. Alliance Capital Management, L.P. 1345 Avenue of the Americas New York, New York 10105 (Name and address of agent for service) Registrant's telephone number, including area code: (800) 221-5672 Date of fiscal year end: October 31, 2003 Date of reporting period: April 30, 2003 ITEM 1. REPORTS TO STOCKHOLDERS. - -------------------------------------------------------------------------------- CLOSED END - -------------------------------------------------------------------------------- ACM Municipal Securities Income Fund Semi-Annual Report April 30, 2003 [GRAPHIC OMITTED] [LOGO] ALLIANCEBERNSTEIN(SM) Investment Research and Management Investment Products Offered ---------------------------- o Are Not FDIC Insured o May Lose Value o Are Not Bank Guaranteed ---------------------------- AllianceBernstein Investment Research and Management, Inc., the principal underwriter of the AllianceBernstein mutual funds and an affiliate of Alliance Capital Management L.P., the manager of the funds, is a member of the NASD. ------------------ SEMI-ANNUAL REPORT ------------------ June 4, 2003 Semi-Annual Report This report provides management's discussion of fund performance for ACM Municipal Securities Income Fund's (the "Fund") semi-annual reporting period ended April 30, 2003. Investment Objective and Policies ACM Municipal Securities Income Fund is a closed-end management investment company designed to provide high current income exempt from regular federal income tax. The Fund invests substantially all of its assets in investment grade municipal securities. Investment Results The following table provides performance data for the Fund and its benchmark, the Lehman Brothers Municipal Bond Index, for the six- and 12-month periods ended April 30, 2003. For comparison, returns for the Lipper General & Leveraged Municipal Debt Funds Average are also included. INVESTMENT RESULTS* Periods Ended April 30, 2003 ------------------------ Returns ------------------------ 6 Months 12 Months - -------------------------------------------------------------------------------- ACM Municipal Securities Income Fund (NAV) 4.62% 1.90% - -------------------------------------------------------------------------------- Lehman Brothers Municipal Bond Index 3.59% 8.49% - -------------------------------------------------------------------------------- Lipper General & Leveraged Muni Debt Funds Average 5.24% 10.27% - -------------------------------------------------------------------------------- The Fund's Market Price Per Share on April 30, 2003 was $11.60. * The Fund's investment results are for the periods shown and are based on the Fund's net asset value (NAV) as of April 30, 2003. All fees and expenses related to the operation of the Fund have been deducted. Returns for the Fund include the reinvestment of any distributions paid during each period. Past performance is no guarantee of future results. The Lehman Brothers Municipal Bond Index is a total return performance benchmark for the long-term, investment grade, tax-exempt bond market. The Lipper General & Leveraged Municipal Debt Funds Average is comprised of leveraged closed-end funds with generally similar investment objectives to ACM Municipal Securities Income Fund, although some may have different investment policies. An investor cannot invest directly in an index, and its results are not indicative of any specific investment, including ACM Municipal Securities Income Fund. For the six months ended April 30, 2003, the municipal bond market posted positive returns. The Fund generated a positive return, as well, and outperformed its benchmark, the Lehman Brothers Municipal Bond Index. The positive performance was aided by the Fund's leverage and by some recovery in the prices of airline backed revenue bonds. Performance was hurt by the Fund's relative overweight position in tobacco settlement bonds. In addition, the lower interest rate sensitivity of many of the Fund's bond positions also hurt performance. In comparison to its Lipper peer group, the Fund, underperformed largely because of its relatively low - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 1 - ------------------ SEMI-ANNUAL REPORT - ------------------ sensitivity to interest rate changes and its relative overweight in tobacco holdings. Over the 12-month period, municipal bond yields declined substantially. This resulted in strong positive price performance for the municipal bond market. While the Fund also generated positive returns, it underperformed both the Lehman Brothers Municipal Bond Index and the Lipper General & Leveraged Municipal Debt Funds Average. The Fund's exposure to airline backed revenue bonds contributed significantly to its underperformance. Even though airline backed revenue bond prices have recovered recently, they are still lower today than a year ago. The Fund's exposure to this sector is now below 3%. In addition, the Fund's relatively low overall sensitivity to interest rates hurt performance, as did its relative overweight position in tobacco bonds. Market Review and Investment Strategy The pace of municipal issuance continues to be quite strong. Year-to-date issuance has totaled $145.6 billion -- an increase of almost 14% from the same period in 2002. This high level of issuance has impaired municipal price performance relative to the taxable bond market. State and local governments are currently mired in their worst financial crises in decades. Policy makers are debating how much to cut expenses and raise taxes to close their projected budget shortfalls. The Center on Budget and Policy Priorities estimates that states' collective projected budget deficits could reach $85 billion in fiscal year 2004. Two states, California and Oregon, were recently downgraded by Moody's Investors Service, and 16 more continue to have "negative" outlooks, meaning they are at risk for being downgraded, as well. The Fund has minimal general obligation exposure and, therefore, has generally been sheltered from the recent credit spread widening affecting these bonds. Investment activity over the past six months focused on improving the credit quality of the Fund. The Fund's exposure to the health care, airline-backed revenue and tobacco settlement sectors was reduced over the period and replaced by higher credit quality bonds. In an effort to maintain a low cost of leverage, one series of its variable rate preferred stock was reset into an extended rate mode expiring in December, 2003. The other two series continue to reset on a weekly basis. - -------------------------------------------------------------------------------- 2 o ACM MUNICIPAL SECURITIES INCOME FUND ------------------------ PORTFOLIO OF INVESTMENTS ------------------------ PORTFOLIO OF INVESTMENTS April 30, 2003 (unaudited) Standard Principal & Poor's Amount Rating (000) Value - -------------------------------------------------------------------------------- Long-Term Investments-172.0% Alabama-3.4% Jefferson Cnty Rev Sewer Imps Ser 02B FGIC 5.00%, 2/01/41 ...................... AAA $ 4,000 $4,046,920 ---------- California-2.8% California St School Imps Ser 03 5.00%, 2/01/32 ...................... A 1,350 1,333,665 California St Rev Dept of Wtr Ser 02A 5.375%, 5/01/22(a) .................. A3 2,000 2,077,520 ---------- 3,411,185 ---------- Colorado-0.8% Colorado Rev E-470 Pub Hwy Auth Ser 00 Zero coupon, 9/01/35 ................ BBB- 10,000 910,700 ---------- Connecticut-2.6% Connecticut Public Improv (Mohegan Tribe) Ser 01 6.25%, 1/01/31(b) ................... BBB- 3,000 3,136,230 ----------- District of Columbia-12.9% District of Columbia Tobacco Settlement Ser 01 6.75%, 5/15/40 ...................... A- 17,950 15,484,747 ----------- Florida-23.5% Collier Cnty Hlth Fac Rev (The Moorings Proj) Ser 94 7.00%, 12/01/19 ..................... A- 2,000 2,150,400 Florida Hsg Fin Corp Rev (Westlake Apts) Ser 02-D1 AMT FSA 5.40%, 3/01/42 ...................... AAA 8,780 8,958,322 Florida Hsg Fin Corp Rev (Westminster Apts) Ser 02-E1 AMT FSA 5.40%, 4/01/42 ...................... AAA 2,850 2,912,900 Lee Cnty Hlth Fac Rev (Shell Point Village Proj) Ser 99A 5.50%, 11/15/29 ..................... BBB- 10,170 9,224,393 - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 3 - ------------------------ PORTFOLIO OF INVESTMENTS - ------------------------ Standard Principal & Poor's Amount Rating (000) Value - -------------------------------------------------------------------------------- Orange Cnty Hlth Fac Rev (Orlando Regl Healthcare) Ser 02 5.75%, 12/01/32 ..................... A- $ 1,400 $ 1,431,990 Orlando FL Utilities Water & Elec Rev Ser 93A 9.75%, 10/06/17(a)(c) ............... Aaa 1,720 1,826,967 9.75%, 10/06/17(a)(c)(d) ............ Aaa 1,595 1,717,735 ----------- 28,222,707 ----------- Hawaii-2.5% Hawaii St Elec Rev Ser 03B AMT XLCA 5.00%, 12/01/22 ..................... AAA 3,000 3,020,850 ----------- Illinois-6.5% Chicago IL Hsg Agy Mortgage Rev Ser 02B AMT GNMA/FNMA 4.00%, 10/01/33(e) .................. AAA 1,000 1,092,600 Chicago IL Spec Fac (American Airlines) Ser 94 8.20%, 12/01/24 ..................... CC 2,500 825,175 Illinois Dev Fin Auth Gas Rev (Peoples Gas Light) Ser 03 AMBAC 5.00%, 2/01/33 ...................... AAA 2,000 2,027,580 Metropolitan Pier & Exposition Rev (McCormick Pl Expansion) Ser 02A MBIA 5.25%, 6/15/42 ...................... AAA 3,750 3,902,025 ----------- 7,847,380 ----------- Indiana-6.2% Warrick Cnty Ind Rev (Southern IN Gas & Electric) Ser 93B AMT 6.00%, 5/01/23 ...................... A- 7,290 7,491,714 ----------- Louisiana-0.2% Calcasieu Parish Hsg Agy Mortgage Rev Ser 97A AMT GNMA/FNMA 6.40%, 4/01/32(a) ................... Aaa 230 240,656 ----------- Maine-0.9% Jay ME Solid Waste Disp Rev (International Paper Co) Ser 99B AMT 6.20%, 9/01/19 ...................... BBB 1,000 1,023,360 ----------- - -------------------------------------------------------------------------------- 4 o ACM MUNICIPAL SECURITIES INCOME FUND ------------------------ PORTFOLIO OF INVESTMENTS ------------------------ Standard Principal & Poor's Amount Rating (000) Value - -------------------------------------------------------------------------------- Massachusetts-7.5% Mass Hlth & Ed Fac Hosp Rev (New England Med Ctr) Ser 94 MBIA 9.03%, 7/01/18(c) ................... AAA $ 5,000 $ 5,307,250 Mass Hsg Fin Agy Residential Hsg Ser 00A AMT AMBAC 6.00%, 7/01/41 ...................... AAA 2,965 3,132,137 Mass Hsg Fin Agy Residential Hsg Ser 00H AMT MBIA 6.65%, 7/01/41 ...................... AAA 555 601,836 ----------- 9,041,223 ----------- Michigan-11.6% Michigan St Hosp Rev (Trinity Hlth) Ser 00A 6.00%, 12/01/27 ..................... AA- 3,000 3,239,190 Michigan St Strategic Elec Rev (Detroit Edison Co) Ser 02C AMT XLCA 5.45%, 12/15/32 ..................... AAA 6,000 6,250,200 Saginaw Mich Hosp Fac Rev (Covenant Med Ctr) Ser 00F 6.50%, 7/01/30 ...................... A 4,150 4,468,969 ----------- 13,958,359 ----------- Minnesota-1.9% Bass Brook Poll Ctl Rev (Minnesota Pwr & Light Co) Ser 92 6.00%, 7/01/22 ...................... A 2,250 2,288,565 ----------- Mississippi-7.6% Adams Cnty Poll Ctl Rev (International Paper Co) Ser 99 AMT 6.25%, 9/01/23 ...................... BBB 5,000 5,087,000 Gulfport Hosp Fac Rev (Mem Hosp at Gulfport Proj) Ser 01A 5.75%, 7/01/31(a) ................... A2 4,000 4,096,360 ----------- 9,183,360 ----------- New Jersey-3.3% New Jersey St Edl Facs Auth Rev AMBAC 9.15%, 9/01/21(a)(b)(f) ............. Aaa 3,400 3,907,620 ----------- New York-13.8% Nassau Cnty Tobacco Settlement Corp Ser 99 6.60%, 7/15/39(a) ................... A3 1,495 1,397,945 - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 5 - ------------------------ PORTFOLIO OF INVESTMENTS - ------------------------ Standard Principal & Poor's Amount Rating (000) Value - -------------------------------------------------------------------------------- New York City Indl Dev Agy Rev (Terminal One Group) Ser 94 AMT 6.125%, 1/01/24(a) .................. A3 $ 10,600 $10,915,880 New York City Indl Dev Agy Rev (British Airways) Ser 98 AMT 5.25%, 12/01/32 ..................... BBB- 6,980 4,327,600 ----------- 16,641,425 ----------- North Dakota-3.3% North Dakota St Hsg Fin Agy Mortgage Rev Ser 98E AMT 5.25%, 1/01/30(a) ................... Aa2 3,975 4,008,629 ----------- Ohio-12.9% Cuyahoga Cnty Hosp Fac Rev (University Hosp Hlth) Ser 00 7.50%, 1/01/30 ...................... BBB 3,650 4,046,609 Ohio Hsg Fin Agy Mortgage Rev Ser 97 AMT GNMA 6.15%, 3/01/29(a) ................... Aaa 6,935 7,243,746 Ohio State Wtr Dev Auth Solid Waste (North Star) Ser 95 AMT 6.45%, 9/01/20 ...................... A 4,075 4,263,428 ----------- 15,553,783 ----------- Pennsylvania-7.8% Pennsylvania Econ Dev Fin Rev (30th St Station Garage Proj) Ser 02 AMT ACA 5.875%, 6/01/33 ..................... A 2,050 2,104,469 Pennsylvania Hsg Fin Agy Mortgage Rev Ser 99-68A AMT 6.15%, 10/01/30 ..................... AA+ 7,000 7,323,050 ----------- 9,427,519 ----------- South Carolina-0.7% South Carolina Rev Tobacco Settlement Ser 01B 6.375%, 5/15/28 ..................... A- 950 825,256 ----------- Tennessee-9.2% Tenn Ed Loan Rev Educational Funding of South Ser 97B AMT 6.20%, 12/01/21(a) .................. Aa2 10,600 11,067,142 ----------- Texas-16.2% Alliance Arpt Auth Fac Imp Rev (American Airlines) Ser 90 AMT 7.50%, 12/01/29 ..................... CC 510 168,320 - -------------------------------------------------------------------------------- 6 o ACM MUNICIPAL SECURITIES INCOME FUND ------------------------ PORTFOLIO OF INVESTMENTS ------------------------ Standard Principal & Poor's Amount Rating (000) Value - -------------------------------------------------------------------------------- Harris Cnty Hwy Toll Rev Ser 02 FSA 5.125%, 8/15/32 ..................... AAA $ 5,000 $ 5,135,250 Lower Colorado Riv Poll Ctl Rev (Samsung Corp) Ser 00 AMT 6.95%, 4/01/30 ...................... A- 5,000 5,439,950 Lower Colorado Riv Rev MBIA Ser 02 5.00%, 5/15/31 ...................... AAA 8,500 8,736,130 ------------- 19,479,650 ------------- Washington-7.8% Pilchuck Dev Pub Corp Spec Fac (BF Goodrich) Ser 93 AMT 6.00%, 8/01/23 ...................... BBB 9,500 9,411,175 ------------- West Virginia-6.1% West Virginia Pkwys Econ Parkway Rev Ser 93 FGIC 10.26%, 5/16/19(c) .................. AAA 4,605 4,778,332 10.26%, 5/16/19(c)(d) ............... AAA 2,495 2,602,659 ------------- 7,380,991 ------------- Total Long-Term Investments (cost $202,493,050) ................. 207,011,146 ------------- Short-Term Investments-3.9% California-0.8% Los Angeles Wtr & Pwr Rev Ser 01B 1.32%, 7/01/34(f) ................... A-1+ 1,000 1,000,000 ------------- Connecticut-0.4% Connecticut St Hlth & Edl Facs Rev (Yale Univ) Ser 97T 1.30%, 7/01/29(f) ................... A-1+ 500 500,000 ------------- Illinois-0.8% Illinois Dev Fin Auth Poll Ctl Rev (Amoco Oil Co Proj) Ser 94 1.35%, 11/01/12(f) .................. A-1+ 1,000 1,000,000 ------------- Michigan-0.4% Michigan St Univ Rev Ser 02A 1.40%, 8/15/32(f) ................... A-1+ 500 500,000 ------------- New York-0.4% New York City Wtr Fin Rev Wtr & Swr Sys Ser 94G FGIC 1.40%, 6/15/24(f) ................... A-1+ 500 500,000 ------------- - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 7 - ------------------------ PORTFOLIO OF INVESTMENTS - ------------------------ Standard Principal & Poor's Amount Rating (000) Value - ------------------------------------------------------------------------------- Texas-1.1% Gulf Coast Waste Disp Auth Rev (Amoco Oil Co Proj) Ser 92 1.30%, 10/01/17(f) .................. A-1+ $ 1,000 $ 1,000,000 Lower Neches Valley Auth Rev (Exxon-Mobil Corp) Ser 01A 1.30%, 11/01/29(f) .................. A-1+ 200 200,000 ------------- 1,200,000 ------------- Total Short-Term Investments (cost $4,700,000) ................... 4,700,000 ------------- Total Investments-175.9% (cost $207,193,050) ................. 211,711,146 Other assets less liabilities-(1.1)% ... (1,378,113) Preferred Stock, at redemption value-(74.8)% ....................... (90,000,000) ------------- Net Assets Applicable to Common Shareholders-100%(g) ................ $ 120,333,033 ============= See footnote summary on page 9. - -------------------------------------------------------------------------------- 8 o ACM MUNICIPAL SECURITIES INCOME FUND ------------------------ PORTFOLIO OF INVESTMENTS ------------------------ (a) Moody's or Fitch Rating. (b) Private Placement. (c) Inverse Floater Security - Security with variable or floating interest rate that moves in opposite direction of short-term interest rates. (d) Pre-refunded issues are secured by escrowed cash and/or direct U.S. guaranteed obligations. (e) Coupon is 4.00% until May 31, 2003 then 6.00% until maturity. (f) Variable rate coupon, rate shown as of April 30, 2003. (g) Portfolio percentages are calculated based on net assets applicable to common shareholders. Glossary of Terms: ACA - American Capital Access Financial Guaranty Corporation AMBAC - American Municipal Bond Assurance Corporation AMT - Alternative Minimum Tax FGIC - Financial Guaranty Insurance Company FNMA - Federal National Mortgage Association FSA - Financial Security Assurance GNMA - Government National Mortgage Association MBIA - Municipal Bond Investors Assurance XLCA - XL Capital Assurance Inc. See notes to financial statements. - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 9 - --------------------------------- STATEMENT OF ASSETS & LIABILITIES - --------------------------------- STATEMENT OF ASSETS & LIABILITIES April 30, 2003 (unaudited) Assets Investments in securities, at value (cost $207,193,050) ..... $211,711,146 Interest receivable ......................................... 3,969,554 Prepaid expenses ............................................ 27,977 ------------ Total assets ................................................ 215,708,677 ------------ Liabilities Due to custodian ............................................ 19,890 Payable for investment securities purchased ................. 4,319,679 Dividend payable--common shares ............................. 799,861 Advisory fee payable ........................................ 88,799 Dividend payable--preferred shares .......................... 41,373 Administrative fee payable .................................. 27,364 Accrued expenses and other liabilities ...................... 78,678 ------------ Total liabilities ........................................... 5,375,644 ------------ Preferred Stock, at redemption value $.01 par value per share; 3,600 shares Auction Preferred Stock authorized, issued and outstanding at $25,000 per share liquidation preference ......................... 90,000,000 ------------ Net Assets Applicable to Common Shareholders ................ $120,333,033 ============ Composition of Net Assets Applicable to Common Shareholders Common Stock, $.01 par value per share; 99,996,400 shares authorized, 11,032,569 shares issued and outstanding ................. $ 110,326 Additional paid-in capital .................................. 149,547,360 Undistributed net investment income ......................... 385,751 Accumulated net realized loss on investment transactions .... (34,228,500) Net unrealized appreciation of investments .................. 4,518,096 ------------ Net Assets Applicable to Common Shareholders ................ $120,333,033 ============ Net Asset Value Applicable to Common Shareholders (based on 11,032,569 common shares outstanding) .......... $10.91 ====== See notes to financial statements. - -------------------------------------------------------------------------------- 10 o ACM MUNICIPAL SECURITIES INCOME FUND ----------------------- STATEMENT OF OPERATIONS ----------------------- STATEMENT OF OPERATIONS Six Months Ended April 30, 2003 (unaudited) Investment Income Interest ..................................... $ 6,613,612 Expenses Advisory fee ................................. $ 522,866 Auction Preferred Stock-- auction agent's fees ...................... 161,477 Administrative fee ........................... 156,860 Audit and legal .............................. 48,814 Custodian .................................... 44,632 Printing ..................................... 43,437 Registration fees ............................ 20,851 Transfer agency .............................. 12,789 Directors' fees and expenses ................. 12,000 Miscellaneous ................................ 10,078 ------------- Total expenses ............................... 1,033,804 ------------- Net investment income ........................ 5,579,808 ------------- Realized and Unrealized Gain (Loss) on Investments Net realized loss on investment transactions .............................. (5,268,239) Net change in unrealized appreciation/depreciation of investments ............................ 5,707,156 ------------- Net gain on investments ...................... 438,917 ------------- Dividends to Auction Preferred Shareholders from Net investment income ........................ (563,903) ------------- Net Increase in Net Assets Applicable to Common Shareholders Resulting from Operations ........................... $ 5,454,822 ============= See notes to financial statements. - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 11 ---------------------------------- STATEMENT OF CHANGES IN NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS ---------------------------------- STATEMENT OF CHANGES IN NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS Six Months Ended Year Ended April 30, 2003 October 31, (unaudited) 2002 ============== ============= Increase (Decrease) in Net Assets Applicable to Common Shareholders Resulting from Operations Net investment income ........................ $ 5,579,808 $ 11,880,783 Net realized loss on investment transactions .............................. (5,268,239) (1,971,343) Net change in unrealized appreciation/depreciation of investments ............................ 5,707,156 (12,641,017) Dividends to Auction Preferred Shareholders from Net Investment Income ........................ (563,903) (1,510,326) ------------- ------------- Net increase (decrease) in net assets applicable to common shareholders resulting from operations ................. 5,454,822 (4,241,903) Dividends and Distributions to Common Shareholders from Net investment income ........................ (4,794,189) (9,539,170) Common Stock Transactions Reinvestment of dividends resulting in the issuance of common stock .............. 349,623 902,750 ------------- ------------- Total increase (decrease) .................... 1,010,256 (12,878,323) Net Assets Applicable to Common Shareholders Beginning of period .......................... 119,322,777 132,201,100 ------------- ------------- End of period (including undistributed net investment income of $164,035, at October 31, 2002) ...................... $ 120,333,033 $ 119,322,777 ============= ============= See notes to financial statements. - -------------------------------------------------------------------------------- 12 o ACM MUNICIPAL SECURITIES INCOME FUND ----------------------------- NOTES TO FINANCIAL STATEMENTS ----------------------------- NOTES TO FINANCIAL STATEMENTS April 30, 2003 (unaudited) NOTE A Significant Accounting Policies ACM Municipal Securities Income Fund, Inc. (the "Fund"), was incorporated in the state of Maryland on February 11, 1993 and is registered under the Investment Company Act of 1940 as a diversified, closed-end management investment company. The financial statements have been prepared in conformity with accounting principles generally accepted in the United States, which require management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities in the financial statements and amounts of income and expenses during the reporting period. Actual results could differ from those estimates. The following is a summary of significant accounting policies followed by the Fund. 1. Security Valuation In accordance with Pricing Policies adopted by the Board of Directors of the Fund (the "Pricing Policies") and applicable law, portfolio securities are valued at current market value or at fair value. The Board of Directors has delegated to the Adviser, subject to the Board's continuing oversight, certain responsibilities with respect to the implementation of the Pricing Policies. Pursuant to the Pricing Policies, securities for which market quotations are readily available are valued at their current market value. In general, the market value of these securities is determined as follows: Securities listed on a national securities exchange or on a foreign securities exchange are valued at the last sale price at the close of the exchange or foreign securities exchange. If there has been no sale on such day, the securities are valued at the mean of the closing bid and asked prices on such day. If no bid or asked prices are quoted on such day, then the security is valued in good faith at fair value in accordance with the Pricing Policies. Securities listed on more than one exchange are valued by reference to the principal exchange on which the securities are traded; securities not listed on an exchange but traded on The Nasdaq Stock Market, Inc. ("NASDAQ") are valued in accordance with the NASDAQ Official Closing Price; listed put or call options are valued at the last sale price. If there has been no sale on that day, such securities will be valued at the closing bid prices on that day; open futures contracts and options thereon are valued using the closing settlement price or, in the absence of such a price, the most recent quoted bid price. If there are no quotations available for the day of valuations, the last available closing settlement price is used; securities traded in the over-the-counter market, (but excluding securities traded on NASDAQ) are valued at the mean of the current bid and asked prices as reported by the National Quotation Bureau or other comparable sources; U.S. Government securities and other debt instruments having 60 days or less remaining until maturity are valued at amortized cost if their original maturity was 60 days or less, or by amortizing their fair value as of the 61st day prior to maturity if their original term to maturity exceeded 60 - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 13 - ----------------------------- NOTES TO FINANCIAL STATEMENTS - ----------------------------- days; fixed-income securities, including mortgage backed and asset backed securities, may be valued on the basis of prices provided by a pricing service or at a price obtained from one or more of the major broker/dealers. In cases where broker/dealer quotes are obtained, the Pricing Policies provide that the Adviser may establish procedures whereby changes in market yields or spreads are used to adjust, on a daily basis, a recently obtained quoted price on a security; and OTC and other derivatives are valued on the basis of a quoted bid price or spread from a major broker/dealer in such security. Securities for which market quotations are not readily available are valued at fair value in accordance with the Pricing Policies. 2. Taxes It is the Fund's policy to meet the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute substantially all of its investment company taxable income and net realized gains, if any, to shareholders. Therefore, no provisions for federal income or excise taxes are required. 3. Investment Income and Investment Transactions Interest income is accrued daily. Investment transactions are accounted for on the date the securities are purchased or sold. Investment gains and losses are determined on the identified cost basis. The Fund amortizes premiums and accretes original issue discounts and market discounts as adjustments to interest income. 4. Dividends and Distributions Dividends and distributions to shareholders are recorded on the ex-dividend date. Income and capital gains distributions are determined in accordance with federal tax regulations and may differ from those determined in accordance with accounting principles generally accepted in the United States. To the extent these differences are permanent, such amounts are reclassified within the capital accounts based on their federal tax basis treatment; temporary differences do not require such reclassification. NOTE B Advisory, Administrative Fees and Other Transactions with Affiliates Under the terms of an investment advisory agreement, the Fund pays Alliance Capital Management L.P. (the "Adviser") an advisory fee at an annual rate of .50 of 1% of the average weekly net assets of the Fund. Such fee is accrued daily and paid monthly. Under the terms of a Shareholder Inquiry Agency Agreement with Alliance Global Investor Services, Inc. (AGIS), an affiliate of the Adviser, the Fund reimburses AGIS for costs relating to servicing phone inquiries for the Fund. During the six months ended April 30, 2003, there was no reimbursement paid to AGIS. - -------------------------------------------------------------------------------- 14 o ACM MUNICIPAL SECURITIES INCOME FUND ----------------------------- NOTES TO FINANCIAL STATEMENTS ----------------------------- Under the terms of an Administration Agreement, the Fund pays Alliance Capital Management L.P. (the "Administrator") an administration fee at an annual rate of ..15 of 1% of the average weekly net assets of the Fund. Such fee is accrued daily and paid monthly. The Administrator has engaged Prudential Investments LLC (the "Sub-Administrator"), an indirect, wholly-owned subsidiary of Prudential Financial, Inc., to act as sub-administrator. The Administrator, out of its own assets, will pay the Sub-Administrator a monthly fee equal to an annual rate of ..10 of 1% of the Fund's average weekly net assets. The Sub-Administrator prepares financial and regulatory reports for the Fund and provides other clerical services. NOTE C Investment Transactions Purchases and sales of investment securities (excluding short-term investments) for the six months ended April 30, 2003, were as follows: Purchases Sales =========== =========== Investment securities .......................... $28,208,104 $20,945,330 U.S. government securities ..................... -0- -0- The cost of investments for federal income tax purposes was substantially the same as the cost for financial reporting purposes. NOTE D Distributions To Common Shareholders The tax character of distributions to be paid for the year ending October 31, 2003 will be determined at the end of the current fiscal year. The tax character of distributions paid to common shareholders during the fiscal years ended October 31, 2002 and October 31, 2001 were as follows: 2002 2001 ========== ========== Distributions paid from: Ordinary income ......................... $ 103,452 $ 281,885 Tax-exempt income ....................... 9,384,782 9,367,843 ---------- ---------- Total distributions paid ................... $9,488,234(a) $9,649,728(a) ========== ========== - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 15 - ----------------------------- NOTES TO FINANCIAL STATEMENTS - ----------------------------- As of October 31, 2002, the components of accumulated earnings/(deficit) applicable to common shareholders on a tax basis were as follows: Undistributed net tax exempt income .................... $ 1,014,992 Accumulated capital and other losses ................... (28,661,534)(b) Unrealized appreciation/(depreciation) ................. (1,487,789)(c) ------------ Total accumulated earnings/(deficit) ................... $(29,134,331) ============ (a) Total distributions paid differ from the statement of changes in net assets applicable to common shareholders because for tax purposes dividends are recognized when actually paid. (b) On October 31, 2002, the Fund had a net capital loss carryforward of $28,661,534 of which $9,919,727 expires in the year 2003, $6,475,518 expires in the year 2007, $10,294,946 expires in the year 2008, and $1,971,343 expires in the year 2010. To the extent future capital gains are offset by capital loss carryforward, such gains will not be distributed. (c) The difference between book-basis and tax-basis unrealized appreciation/(depreciation) is attributable primarily to the tax deferral of losses on wash sales. NOTE E Common Stock There are 99,996,400 shares of $0.01 par value common stock authorized. There are 11,032,569 shares of common stock outstanding at April 30, 2003. During the six months ended April 30, 2003 and the year ended October 31, 2002, the Fund issued 31,767 and 77,262 shares, respectively, in connection with the Fund's dividend reinvestment plan. NOTE F Preferred Stock The Fund has issued and outstanding 3,600 shares of Auction Preferred Stock, consisting of 1,200 shares each of Series A, Series B and Series C. The preferred shares have a liquidation value of $25,000 per share plus accumulated, unpaid dividends. The dividend rate on Series A is 1.15%, effective through May 1, 2003. The dividend rate on Series B is 1.30%, effective through May 1, 2003. The dividend rate on Series C is 1.15%, effective through May 2, 2003. At certain times, the Preferred Shares are redeemable by the Fund, in whole or in part, at $25,000 per share plus accumulated, unpaid dividends. - -------------------------------------------------------------------------------- 16 o ACM MUNICIPAL SECURITIES INCOME FUND ----------------------------- NOTES TO FINANCIAL STATEMENTS ----------------------------- Although the Fund will not ordinarily redeem the Preferred Shares, it may be required to redeem shares if, for example, the Fund does not meet an asset coverage ratio required by law or to correct a failure to meet a rating agency guideline in a timely manner. The Fund voluntarily may redeem the Preferred Shares in certain circumstances. The Preferred Shareholders, voting as a separate class, have the right to elect at least two Directors at all times and to elect a majority of the Directors in the event two years' dividends on the Preferred Shares are unpaid. In each case, the remaining Directors will be elected by the Common Shareholders and Preferred Shareholders voting together as a single class. The Preferred Shareholders will vote as a separate class on certain other matters as required under the Fund's Charter, the Investment Company Act of 1940 and Maryland law. - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 17 - -------------------- FINANCIAL HIGHLIGHTS - -------------------- FINANCIAL HIGHLIGHTS Selected Data For A Share Of Common Stock Outstanding Throughout Each Period Six Months Ended Year Ended October 31, April 30, 2003 ------------------------------------------------------------ (unaudited) 2002 2001 2000 1999 1998 ----------------------------------------------------------------------------- Net asset value, beginning of period ......... $ 10.85 $ 12.10 $ 11.71 $ 11.64 $ 13.49 $ 13.46 ----------------------------------------------------------------------------- Income From Investment Operations Net investment income ......... .51 1.08 1.15 1.12 1.11 1.16 Net realized and unrealized gain (loss) on investment transactions ................ .04 (1.32) .45 .16 (1.82) .04 Dividends to preferred shareholders from Net investment income (common stock equivalent basis) ..... (.05) (.14) (.27) (.34) (.27) (.29) ----------------------------------------------------------------------------- Net increase (decrease) in net asset value from operations .................. .50 (.38) 1.33 .94 (.98) .91 ----------------------------------------------------------------------------- Less: Dividends and Distributions to Common Shareholders Dividends from net investment income ........... (.44) (.87) (.88) (.78) (.84) (.86) Distributions in excess of net investment income ....... -0- -0- (.06) (.09) (.03) (.02) ----------------------------------------------------------------------------- Total dividends and distributions to common shareholders ................ (.44) (.87) (.94) (.87) (.87) (.88) ----------------------------------------------------------------------------- Net asset value, end of period ................. $ 10.91 $ 10.85 $ 12.10 $ 11.71 $ 11.64 $ 13.49 ============================================================================= Market value, end of period ... $ 11.60 $ 11.50 $ 12.70 $ 12.56 $ 11.69 $ 14.06 ============================================================================= Total Return Total investment return based on:(a) Market value ................ 4.91% (2.44)% 9.14% 16.16% (11.14)% 6.19% Net asset value ............. 4.62% (3.35)% 11.59% 8.74% (7.76)% 6.89% Ratios/Supplemental Data Net assets, applicable to common shareholders, end of period (000's omitted) .............. $120,333 $119,323 $132,201 $127,142 $125,850 $144,995 Preferred stock, at redemption value ($25,000 per share liquidation preference) (000's omitted) ............. $ 90,000 $ 90,000 $ 90,000 $ 90,000 $ 90,000 $ 90,000 Ratios to average net assets applicable to common shareholders of: Expenses(b) ................. 1.72%(c) 1.65% 1.53% 1.61% 1.45% 1.45% Net investment income, before preferred stock dividends(b) .............. 9.31%(c) 9.32% 9.60% 9.92% 8.54% 8.58% Preferred stock dividends ... 0.94%(c) 1.19% 2.26% 3.03% 2.08% 2.20% Net investment income, net of preferred stock dividends ................. 8.37%(c) 8.13% 7.34% 6.89% 6.46% 6.38% Portfolio turnover rate ....... 10% 24% 82% 360% 292% 60% Asset coverage ratio .......... 234% 233% 247% 241% 240% 261% See footnote summary on page 19. - -------------------------------------------------------------------------------- 18 o ACM MUNICIPAL SECURITIES INCOME FUND -------------------- FINANCIAL HIGHLIGHTS -------------------- (a) Total investment return is calculated assuming a purchase of common stock on the opening of the first day and a sale on the closing of the last day of each period reported. Dividends and distributions, if any, are assumed for purposes of this calculation, to be reinvested at prices obtained under the Fund's dividend reinvestment plan. Generally, total investment return based on net asset value will be higher than total investment return based on market value in periods where there is an increase in the discount or a decrease in the premium of the market value to net asset value from the beginning to the end of such periods. Conversely, total investment return based on net asset value will be lower than total investment return based on market value in periods where there is a decrease in the discount or an increase in the premium of the market value to the net asset value from the beginning to the end of the period. Total investment return calculated for a period of less than one year is not annualized. (b) These expense and net investment income ratios do not reflect the effect of dividend payments to preferred shareholders. (c) Annualized. - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 19 - ------------------------------ SUPPLEMENTAL PROXY INFORMATION - ------------------------------ SUPPLEMENTAL PROXY INFORMATION The Annual Meeting of Shareholders of ACM Municipal Securities Income Fund, Inc. was held on March 20, 2003. The description of each proposal and number of shares voted at the meeting are as follows: Voted For Authority Withheld 1. To elect One Director: John D. Carifa 9,150,723 175,896 (term expires 2006) 2. To elect Two Directors for the Preferred stockholders: John D. Carifa 3,248 2 Ruth Block 3,248 2 (term expires 2006) - -------------------------------------------------------------------------------- 20 o ACM MUNICIPAL SECURITIES INCOME FUND ------------------ BOARD OF DIRECTORS ------------------ BOARD OF DIRECTORS John D. Carifa, Chairman and President Ruth Block(1) David H. Dievler(1) John H. Dobkin(1) William H. Foulk, Jr.(1) Dr. James M. Hester(1) Clifford L. Michel(1) Donald J. Robinson(1) OFFICERS Kathleen A. Corbet, Senior Vice President Robert B. Davidson, III, Senior Vice President David M. Dowden, Vice President Terrance T. Hults, Vice President William E. Oliver, Vice President Edmund P. Bergan, Jr., Secretary Mark D. Gersten, Treasurer & Chief Financial Officer Thomas R. Manley, Controller Administrator Alliance Capital Management L.P. 1345 Avenue of the Americas New York, NY 10105 Sub-Administrator Prudential Investments LLC Gateway Center Three 100 Mulberry Street Newark, NJ 07102-4077 Common Stock: Dividend Paying Agent, Transfer Agent And Registrar Equiserve Trust Company N.A. P.O. Box 43011 Providence, RI 02940-3011 Preferred Stock: Dividend Paying Agent, Transfer Agent And Registrar The Bank of New York 100 Church Street New York, NY 10286 Independent Auditors Ernst & Young LLP 5 Times Square New York, NY 10036-6530 Custodian The Bank of New York One Wall Street New York, NY 10286 Notice is hereby given in accordance with Section 23(c) of the Investment Company Act of 1940 that the Fund may purchase at market prices from time to time shares of its Common Stock in the open market. This report, including the financial statements there, is transmitted to the shareholders of ACM Municipal Securities Income Fund for their information. This is not a prospectus, circular or representation intended for use in the purchase of shares of the Fund or any securities mentioned in the report. (1) Member of the Audit Committee. - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 21 - --------------------------------- ALLIANCEBERNSTEIN FAMILY OF FUNDS - --------------------------------- ALLIANCEBERNSTEIN FAMILY OF FUNDS U.S. Growth Funds Growth Fund Health Care Fund Mid-Cap Growth Fund Premier Growth Fund Quasar Fund Technology Fund Value Funds Disciplined Value Fund Global Value Fund Growth & Income Fund International Value Fund Real Estate Investment Fund Small Cap Value Fund Utility Income Fund Value Fund Blended Style Series U.S. Large Cap Portfolio Global & International Stock Funds All-Asia Investment Fund Global Small Cap Fund Greater China '97 Fund International Premier Growth Fund New Europe Fund Worldwide Privatization Fund Select Investor Series Biotechnology Portfolio Premier Portfolio Small Cap Growth Portfolio Technology Portfolio Taxable Bond Funds Americas Government Income Trust Corporate Bond Portfolio Emerging Market Debt Fund Global Strategic Income Trust High Yield Fund Multi-Market Strategy Trust Quality Bond Portfolio U.S. Government Portfolio Tax-Exempt Bond Funds National Intermediate Diversified Insured National Arizona California Intermediate California Insured California Florida Massachusetts Michigan Minnesota New Jersey New York Intermediate New York Ohio Pennsylvania Virginia Asset Allocation Funds Balanced Shares Conservative Investors Fund Growth Investors Fund Closed-End Funds All-Market Advantage Fund ACM Income Fund ACM Government Opportunity Fund ACM Managed Dollar Income Fund ACM Managed Income Fund ACM Municipal Securities Income Fund California Municipal Income Fund National Municipal Income Fund New York Municipal Income Fund The Spain Fund World Dollar Government Fund World Dollar Government Fund II AllianceBernstein also offers AllianceBernstein Exchange Reserves, which serves as the money market fund exchange vehicle for the AllianceBernstein mutual funds. To obtain a prospectus for any AllianceBernstein fund, call your investment professional, or call AllianceBernstein at (800) 227-4618 or visit our web site at www.alliancebernstein.com. - -------------------------------------------------------------------------------- 22 o ACM MUNICIPAL SECURITIES INCOME FUND ------------------------------ SUMMARY OF GENERAL INFORMATION ------------------------------ SUMMARY OF GENERAL INFORMATION Shareholder Information Daily market prices for the Fund's shares are published in the New York Stock Exchange Composite Transaction Section of newspapers each day, under the designation "ACMMSI." The Fund's NYSE trading symbol is "AMU." Weekly comparative net asset value (NAV) and market price information about the Fund is published each Monday in The Wall Street Journal, each Sunday in The New York Times and each Saturday in Barron's and other newspapers in a table called "Closed-End Bond Funds." Dividend Reinvestment Plan A Dividend Reinvestment Plan provides automatic reinvestment of dividends and capital gains in additional Fund shares. For questions concerning shareholder account information, or if you would like a brochure describing the Dividend Reinvestment Plan, please call Equiserve Trust Company at (800) 219-4218. - -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND o 23 NOTES - -------------------------------------------------------------------------------- 24 o ACM MUNICIPAL SECURITIES INCOME FUND ACM Municipal Securities Income Fund 1345 Avenue of the Americas New York, NY 10105 [LOGO] ALLIANCEBERNSTEIN(SM) Investment Research and Management (SM) This service mark used under license from the owner, Alliance Capital Management L.P. MSISR0403 ITEM 2. CODE OF ETHICS. Not applicable when filing a Semi-Annual report to shareholders. ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. Not applicable when filing a Semi-Annual report to shareholders. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. Not applicable when filing a Semi-Annual report to shareholders. ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS. Not applicable when filing a Semi-Annual report to shareholders. ITEM 6. [RESERVED] ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES. Not applicable when filing a Semi-Annual report to shareholders. ITEM 8. [RESERVED] ITEM 9. CONTROLS AND PROCEDURES. (a) The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-2(c) under the Investment Company Act of 1940, as amended) are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this document. (b) There were no 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. ITEM 10. EXHIBITS. The following exhibits are attached to this Form N-CSR: Exhibit No. DESCRIPTION OF EXHIBIT 10 (b) (1) Certification of Principal Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 10 (b) (2) Certification of Principal Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 10 (c) Certification of Principal Executive Officer and Principal Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 SIGNATURES 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): ACM Municipal Securities Income Fund, Inc. By: /s/John D. Carifa --------------------------------- John D. Carifa President Date: June 30, 2003 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: /s/John D. Carifa --------------------------------- John D. Carifa President Date: June 30, 2003 By: /s/Mark D. Gersten ------------------------------- Mark D. Gersten Treasurer and Chief Financial Officer Date: June 30, 2003