<Page> 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: 811-03326 Morgan Stanley U.S. Government Money Market Trust (Exact name of registrant as specified in charter) 1221 Avenue of the Americas, New York, New York 10020 (Address of principal executive offices) (Zip code) Ronald E. Robison 1221 Avenue of the Americas, New York, New York 10020 (Name and address of agent for service) Registrant's telephone number, including area code: 212-762-4000 Date of fiscal year end: January 31, 2006 Date of reporting period: January 31, 2006 Item 1 - Report to Shareholders <Page> WELCOME, SHAREHOLDER: IN THIS REPORT, YOU'LL LEARN ABOUT HOW YOUR INVESTMENT IN MORGAN STANLEY U.S. GOVERNMENT MONEY MARKET TRUST PERFORMED DURING THE ANNUAL PERIOD. WE WILL PROVIDE AN OVERVIEW OF THE MARKET CONDITIONS, AND DISCUSS SOME OF THE FACTORS THAT AFFECTED PERFORMANCE DURING THE REPORTING PERIOD. IN ADDITION, THIS REPORT INCLUDES THE FUND'S FINANCIAL STATEMENTS AND A LIST OF FUND INVESTMENTS. THIS MATERIAL MUST BE PRECEDED OR ACCOMPANIED BY A PROSPECTUS FOR THE FUND BEING OFFERED. MARKET FORECASTS PROVIDED IN THIS REPORT MAY NOT NECESSARILY COME TO PASS. THERE IS NO ASSURANCE THAT A MUTUAL FUND WILL ACHIEVE ITS INVESTMENT OBJECTIVE. AN INVESTMENT IN A MONEY MARKET FUND IS NOT INSURED OR GUARANTEED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY. ALTHOUGH THE FUND SEEKS TO PRESERVE THE VALUE OF AN INVESTMENT AT $1.00 PER SHARE, IT IS POSSIBLE TO LOSE MONEY BY INVESTING IN THE FUND. PLEASE SEE THE PROSPECTUS FOR MORE COMPLETE INFORMATION ON INVESTMENT RISKS. <Page> FUND REPORT For the year ended January 31, 2006 MARKET CONDITIONS During the 12-month period ended January 31, 2006, the Federal Open Market Committee (the "Fed") continued its pattern of raising short-term rates which began in June of 2004. Through 14 steps of 25 basis points each -- including nine during the 12 months covered by this report -- the Fed increased its target rate for federal funds from 1.00 percent to 4.50 percent. Short-term rates rose alongside the federal funds rate, providing increased return opportunities for investors in money market funds. PERFORMANCE ANALYSIS As of January 31, 2006, Morgan Stanley U.S. Government Money Market Trust had net assets in excess of $937 million and an average portfolio maturity of 36 days. For the 12-month period ended January 31, 2006, the Fund returned 2.71 percent. For the seven-day period ended January 31, 2006, the Fund provided an effective annualized yield of 3.70 percent and a current annualized yield of 3.63 percent, while its 30-day moving average annualized yield for January was 3.62 percent. PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. Our strategy in managing the Fund remained consistent with our long-term focus on preservation of capital and liquidity. We adhered to a conservative approach in managing the Fund, emphasizing high-quality money market obligations. We avoided the use of derivatives or structured notes that might fluctuate excessively with changing interest rates. We also took advantage of the rising yields available on the money market securities. As short-term interest rates climbed, we reinvested the proceeds of maturing short-term holdings into higher-yielding securities. PORTFOLIO COMPOSITION <Table> U.S. Government Agencies 81.3% Repurchase Agreements 18.1 U.S. Treasury Bill 0.6 </Table> MATURITY SCHEDULE <Table> 1 - 30 Days 66.6% 31 - 60 Days 13.8 61 - 90 Days 8.7 91 - 120 Days 0.9 121 + Days 10.0 </Table> DATA AS OF JANUARY 31, 2006. SUBJECT TO CHANGE DAILY. ALL PERCENTAGES FOR PORTFOLIO COMPOSITION AND MATURITY SCHEDULE ARE AS A PERCENTAGE OF TOTAL INVESTMENTS. 2 <Page> INVESTMENT STRATEGY THE FUND WILL INVEST IN HIGH QUALITY, SHORT-TERM U.S. GOVERNMENT SECURITIES. THE FUND'S "INVESTMENT ADVISER," MORGAN STANLEY INVESTMENT ADVISORS INC., SEEKS TO MAINTAIN THE FUND'S SHARE PRICE AT $1.00. THE SHARE PRICE REMAINING STABLE AT $1.00 MEANS THAT THE FUND WOULD PRESERVE THE PRINCIPAL VALUE OF YOUR INVESTMENT. AN INVESTMENT IN THE FUND IS NOT INSURED OR GUARANTEED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY. ALTHOUGH THE FUND SEEKS TO PRESERVE THE VALUE OF YOUR INVESTMENT AT $1.00 PER SHARE, IT IS POSSIBLE TO LOSE MONEY BY INVESTING IN THE FUND. FOR MORE INFORMATION ABOUT PORTFOLIO HOLDINGS EACH MORGAN STANLEY FUND PROVIDES A COMPLETE SCHEDULE OF PORTFOLIO HOLDINGS IN ITS SEMIANNUAL AND ANNUAL REPORTS WITHIN 60 DAYS OF THE END OF THE FUND'S SECOND AND FOURTH FISCAL QUARTERS BY FILING THE SCHEDULE ELECTRONICALLY WITH THE SECURITIES AND EXCHANGE COMMISSION (SEC). THE SEMIANNUAL REPORTS ARE FILED ON FORM N-CSRS AND THE ANNUAL REPORTS ARE FILED ON FORM N-CSR. MORGAN STANLEY ALSO DELIVERS THE SEMIANNUAL AND ANNUAL REPORTS TO FUND SHAREHOLDERS AND MAKES THESE REPORTS AVAILABLE ON ITS PUBLIC WEB SITE, www.morganstanley.com. EACH MORGAN STANLEY FUND ALSO FILES A COMPLETE SCHEDULE OF PORTFOLIO HOLDINGS WITH THE SEC FOR THE FUND'S FIRST AND THIRD FISCAL QUARTERS ON FORM N-Q. MORGAN STANLEY DOES NOT DELIVER THE REPORTS FOR THE FIRST AND THIRD FISCAL QUARTERS TO SHAREHOLDERS, NOR ARE THE REPORTS POSTED TO THE MORGAN STANLEY PUBLIC WEB SITE. YOU MAY, HOWEVER, OBTAIN THE FORM N-Q FILINGS (AS WELL AS THE FORM N-CSR AND N-CSRS FILINGS) BY ACCESSING THE SEC'S WEB SITE, http://www.sec.gov. YOU MAY ALSO REVIEW AND COPY THEM AT THE SEC'S PUBLIC REFERENCE ROOM IN WASHINGTON, DC. INFORMATION ON THE OPERATION OF THE SEC'S PUBLIC REFERENCE ROOM MAY BE OBTAINED BY CALLING THE SEC AT (800) SEC-0330. YOU CAN ALSO REQUEST COPIES OF THESE MATERIALS, UPON PAYMENT OF A DUPLICATING FEE, BY ELECTRONIC REQUEST AT THE SEC'S E-MAIL ADDRESS (publicinfo@sec.gov) OR BY WRITING THE PUBLIC REFERENCE SECTION OF THE SEC, WASHINGTON, DC 20549-0102. HOUSEHOLDING NOTICE TO REDUCE PRINTING AND MAILING COSTS, THE FUND ATTEMPTS TO ELIMINATE DUPLICATE MAILINGS TO THE SAME ADDRESS. THE FUND DELIVERS A SINGLE COPY OF CERTAIN SHAREHOLDER DOCUMENTS, INCLUDING SHAREHOLDER REPORTS, PROSPECTUSES AND PROXY MATERIALS, TO INVESTORS WITH THE SAME LAST NAME WHO RESIDE AT THE SAME ADDRESS. YOUR PARTICIPATION IN THIS PROGRAM WILL CONTINUE FOR AN UNLIMITED PERIOD OF TIME UNLESS YOU INSTRUCT US OTHERWISE. YOU CAN REQUEST MULTIPLE COPIES OF THESE DOCUMENTS BY CALLING (800) 350-6414, 8:00 A.M. TO 8:00 P.M., ET. ONCE OUR CUSTOMER SERVICE CENTER HAS RECEIVED YOUR INSTRUCTIONS, WE WILL BEGIN SENDING INDIVIDUAL COPIES FOR EACH ACCOUNT WITHIN 30 DAYS. 3 <Page> EXPENSE EXAMPLE As a shareholder of the Fund, you incur ongoing costs, including advisory fees; distribution and service (12b-1) fees; and other Fund expenses. This example is intended to help you understand your ongoing costs (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 invested at the beginning of the period and held for the entire period 08/01/05 - 01/31/06. ACTUAL EXPENSES The first line of the table below provides information about actual account values and actual expenses. You may use the information in this line, together with the amount you invested, to estimate the expenses that you paid over the period. Simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 = 8.6), then multiply the result by the number in the first line under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. HYPOTHETICAL EXAMPLE FOR COMPARISON PURPOSES The second line of the table below provides information about 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 cost 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 table are meant to highlight your ongoing costs only. Therefore, the second line of the table is useful in comparing ongoing costs, and will not help you determine the relative total cost of owning different funds that have transactional costs, such as sales charges (loads), and redemption fees, or exchange fees. <Table> <Caption> BEGINNING ENDING EXPENSES PAID ACCOUNT VALUE ACCOUNT VALUE DURING PERIOD * ------------- ------------- --------------- 08/01/05 - 08/01/05 01/31/06 01/31/06 ------------- ------------- --------------- Actual (1.62% return) $ 1,000.00 $ 1,016.20 $ 3.85 Hypothetical (5% annual return before expenses) $ 1,000.00 $ 1,021.66 $ 3.86 </Table> - ---------- * EXPENSES ARE EQUAL TO THE FUND'S ANNUALIZED EXPENSE RATIO OF 0.75% MULTIPLIED BY THE AVERAGE ACCOUNT VALUE OVER THE PERIOD, MULTIPLIED BY 186/365 (TO REFLECT THE ONE-HALF YEAR PERIOD). IF THE FUND HAD BORNE ALL OF ITS EXPENSES THAT WERE REIMBURSED OR WAIVED BY THE INVESTMENT ADVISER AND ADMINISTRATOR, THE ANNUALIZED EXPENSE RATIO WOULD HAVE BEEN 0.77%. 4 <Page> MORGAN STANLEY U.S. GOVERNMENT MONEY MARKET TRUST PORTFOLIO OF INVESTMENTS - JANUARY 31, 2006 <Table> <Caption> ANNUALIZED PRINCIPAL YIELD AMOUNT IN ON DATE OF MATURITY THOUSANDS DESCRIPTION PURCHASE DATE VALUE - ----------------------------------------------------------------------------------------------------------------- U.S. GOVERNMENT AGENCY - DISCOUNT NOTES (64.9%) $ 25,000 Federal Farm Credit Banks 4.19% 02/08/06 $ 24,979,729 397,573 Federal Home Loan Banks 4.23 - 4.52 02/03/06 - 06/07/06 395,631,939 91,913 Federal Home Loan Mortgage Corp. 4.37 - 4.61 03/27/06 - 07/18/06 90,716,177 97,574 Federal National Mortgage Assoc. 4.12 - 4.65 02/01/06 - 07/26/06 96,925,008 -------------- TOTAL U.S. GOVERNMENT AGENCY - DISCOUNT NOTES (COST $608,252,853) 608,252,853 -------------- U.S. GOVERNMENT AGENCY - FLOATING RATE NOTES (17.4%) 48,900 Federal Farm Credit Banks 4.29 - 4.42 02/21/06 - 08/01/06 48,897,983 114,000 Federal Home Loan Banks 4.14 - 4.39 05/10/06 - 08/21/06 113,991,261 -------------- TOTAL U.S. GOVERNMENT AGENCY - FLOATING RATE NOTES (COST $162,889,244) 162,889,244 -------------- REPURCHASE AGREEMENTS (18.2%) 35,000 Banc of America Securities, LLC (dated 01/31/06; proceeds $35,004,307) (a) 4.43 02/01/06 35,000,000 75,000 Deutsche Bank Securities, Inc. (dated 01/31/06; proceeds $75,009,292) (b) 4.46 02/01/06 75,000,000 30,000 Goldman Sachs Group, Inc. (The) (dated 1/26/06; proceeds $30,025,783) (c) 4.42 02/02/06 30,000,000 30,000 Goldman Sachs Group, Inc. (The) (dated 1/23/06; proceeds $30,050,750) (d) 4.35 02/06/06 30,000,000 1,078 The Bank of New York (dated 01/31/06; proceeds $1,077,941) (e) 4.313 02/01/06 1,077,812 -------------- TOTAL REPURCHASE AGREEMENTS (COST $171,077,812) 171,077,812 -------------- U.S. GOVERNMENT OBLIGATION (0.6%) 6,000 U.S. Treasury Bill (COST $5,994,773) 3.93 02/09/06 5,994,773 -------------- TOTAL INVESTMENTS (COST $948,214,682) (f) 101.1% 948,214,682 LIABILITIES IN EXCESS OF OTHER ASSETS (1.1) (10,389,424) ----- -------------- NET ASSETS 100.0% $ 937,825,258 ===== ============== </Table> - ---------- (a) COLLATERALIZED BY FEDERAL NATIONAL MORTGAGE ASSOC. 5.00 - 5.50% DUE 01/01/19 - 03/01/20 VALUED AT $35,700,001. (b) COLLATERALIZED BY FEDERAL NATIONAL MORTGAGE ASSOC. 6.50% DUE 05/01/23 VALUED AT $27,732,967 AND FEDERAL MORTGAGE ACCEPTANCE CORP. 4.00 - 5.50% DUE 08/01/20 - 05/01/25 VALUED AT $48,767,033. (c) COLLATERALIZED BY U.S. TREASURY TINTS 0.00% DUE 05/15/21 VALUED AT $30,600,000. (d) COLLATERALIZED BY U.S. TREASURY TINTS 0.00% DUE 11/15/17 - 05/15/21 VALUED AT $30,600,000. (e) COLLATERALIZED BY FEDERAL NATIONAL MORTGAGE ASSOC. 5.50% DUE 08/01/35 VALUED AT $1,099,368. (f) COST IS THE SAME FOR FEDERAL INCOME TAX PURPOSES. SEE NOTES TO FINANCIAL STATEMENTS 5 <Page> MORGAN STANLEY U.S. GOVERNMENT MONEY MARKET TRUST FINANCIAL STATEMENTS STATEMENT OF ASSETS AND LIABILITIES JANUARY 31, 2006 <Table> ASSETS: Investments in securities, at value (cost $948,214,682) (including repurchase agreements of $171,077,812) $ 948,214,682 Cash 90,000 Receivable for: Interest 901,566 Shares of beneficial interest sold 6,852 Prepaid expenses and other assets 40,273 -------------- TOTAL ASSETS 949,253,373 -------------- LIABILITIES: Payable for: Shares of beneficial interest redeemed 10,791,906 Investment advisory fee 317,316 Distribution fee 63,109 Transfer agent fee 48,315 Administration fee 41,748 Accrued expenses and other payables 165,721 -------------- TOTAL LIABILITIES 11,428,115 -------------- NET ASSETS $ 937,825,258 ============== COMPOSITION OF NET ASSETS: Paid-in-capital $ 937,738,851 Accumulated undistributed net investment income 86,407 -------------- NET ASSETS $ 937,825,258 ============== NET ASSET VALUE PER SHARE 937,803,763 shares outstanding (UNLIMITED SHARES AUTHORIZED OF $.01 PAR VALUE) $ 1.00 ============== </Table> SEE NOTES TO FINANCIAL STATEMENTS 6 <Page> STATEMENT OF OPERATIONS FOR THE YEAR ENDED JANUARY 31, 2006 <Table> NET INVESTMENT INCOME: INTEREST INCOME $ 34,228,165 -------------- EXPENSES Investment advisory fee 4,045,523 Transfer agent fees and expenses 1,799,172 Distribution fee 995,958 Administration fee 508,173 Shareholder reports and notices 164,497 Professional fees 65,142 Registration fees 60,443 Custodian fees 52,107 Trustees' fees and expenses 21,236 Other 56,315 -------------- TOTAL EXPENSES 7,768,566 Less: amounts waived/reimbursed (168,052) -------------- NET EXPENSES 7,600,514 -------------- NET INVESTMENT INCOME $ 26,627,651 ============== </Table> SEE NOTES TO FINANCIAL STATEMENTS 7 <Page> STATEMENT OF CHANGES IN NET ASSETS <Table> <Caption> FOR THE YEAR FOR THE YEAR ENDED ENDED JANUARY 31, 2006 JANUARY 31, 2005 ---------------- ---------------- INCREASE (DECREASE) IN NET ASSETS: OPERATIONS: Net investment income $ 26,627,651 $ 8,941,329 Dividends to shareholders from net investment income (26,626,357) (8,966,340) Net decrease from transactions in shares of beneficial interest (184,921,785) (146,513,383) ---------------- ---------------- NET DECREASE (184,920,491) (146,538,394) NET ASSETS: Beginning of period 1,122,745,749 1,269,284,143 ---------------- ---------------- END OF PERIOD (INCLUDING ACCUMULATED UNDISTRIBUTED NET INVESTMENT INCOME OF $86,407 AND $85,113, RESPECTIVELY) $ 937,825,258 $ 1,122,745,749 ================ ================ </Table> SEE NOTES TO FINANCIAL STATEMENTS 8 <Page> MORGAN STANLEY U.S. GOVERNMENT MONEY MARKET TRUST NOTES TO FINANCIAL STATEMENTS - JANUARY 31, 2006 1. ORGANIZATION AND ACCOUNTING POLICIES Morgan Stanley U.S. Government Money Market Trust (the "Fund") is registered under the Investment Company Act of 1940, as amended (the "Act"), as a diversified, open-end management investment company. The Fund's investment objectives are security of principal, high current income and liquidity. The Fund was organized as a Massachusetts business trust on November 18, 1981 and commenced operations on February 17, 1982. The following is a summary of significant accounting policies: A. VALUATION OF INVESTMENTS -- Portfolio securities are valued at amortized cost, which approximates market value, in accordance with Rule 2a-7 of the Investment Company Act of 1940. B. ACCOUNTING FOR INVESTMENTS -- Security transactions are accounted for on the trade date (date the order to buy or sell is executed). Realized gains and losses on security transactions are determined by the identified cost method. Discounts are accreted and premiums are amortized over the life of the respective securities. Interest income is accrued daily. C. REPURCHASE AGREEMENTS -- The Fund may invest directly with institutions in repurchase agreements. The Fund's custodian receives the collateral, which is marked-to-market daily to determine that the value of the collateral does not decrease below the repurchase price plus accrued interest. D. FEDERAL INCOME TAX POLICY -- It is the Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute substantially all of its taxable income to its shareholders. Accordingly, no federal income tax provision is required. E. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Fund records dividends and distributions to shareholders as of the close of each business day. F. USE OF ESTIMATES -- The preparation of financial statements in accordance with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts and disclosures. Actual results could differ from those estimates. 2. INVESTMENT ADVISORY/ADMINISTRATION AGREEMENTS Pursuant to an Investment Advisory Agreement with Morgan Stanley Investment Advisors Inc. (the "Investment Adviser"), the Fund pays the Investment Adviser an advisory fee, accrued daily and payable monthly, by applying the following annual rates to the net assets of the Fund determined as of the close of each business day: 0.45% to the portion of the daily net assets not exceeding $500 million; 0.375% to the portion of the daily net assets exceeding $500 million but not exceeding $750 million; 0.325% to the portion of the daily net assets exceeding $750 million but not exceeding $1 billion; 0.30% to the portion of the daily net assets exceeding $1 billion but not exceeding $1.5 billion; 0.275% to the 9 <Page> portion of the daily net assets exceeding $1.5 billion but not exceeding $2 billion; 0.25% to the portion of the daily net assets exceeding $2 billion but not exceeding $2.5 billion; 0.225% to the portion of the daily net assets exceeding $2.5 billion but not exceeding $3 billion; and 0.20% to the portion of the daily net assets exceeding $3 billion. Pursuant to an Administration Agreement with Morgan Stanley Services Company Inc. (the "Administrator"), an affiliate of the Investment Adviser, the Fund pays an administration fee, accrued daily and payable monthly, by applying the annual rate of 0.05% to the Fund's daily net assets. For the year ended January 31, 2006 and through April 30, 2006, the Investment Adviser agreed to waive its fee and reimburse expenses to the extent they exceed 0.75% of the daily net assets of the Fund. 3. PLAN OF DISTRIBUTION Morgan Stanley Distributors Inc. (the "Distributor"), an affiliate of the Investment Adviser and Administrator, is the distributor of the Fund's shares and in accordance with a Plan of Distribution (the "Plan") pursuant to Rule 12b-1 under the Act, finances certain expenses in connection with the promotion of sales of Fund shares. Reimbursements for these expenses are made in monthly payments by the Fund to the Distributor, which will in no event exceed an amount equal to a payment at the annual rate of 0.15% of the Fund's average daily net assets during the month. Expenses incurred by the Distributor pursuant to the Plan in any fiscal year will not be reimbursed by the Fund through payments accrued in any subsequent fiscal year. For the year ended January 31, 2006, the distribution fee was accrued at the annual rate of 0.10%. 4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES The cost of purchases and proceeds from sales/maturities of portfolio securities for the year ended January 31, 2006 aggregated $32,457,850,572 and $32,664,221,565, respectively. Morgan Stanley Trust, an affiliate of the Investment Adviser, Administrator and Distributor, is the Fund's transfer agent. The Fund has an unfunded noncontributory defined benefit pension plan covering certain independent Trustees of the Fund who will have served as independent Trustees for at least five years at the time of retirement. Benefits under this plan are based on factors which include years of service and compensation. The Trustees voted to close the plan to new participants and eliminate the future benefits growth due to increases to compensation after July 31, 2003. Aggregate pension costs for the year ended January 31, 2006 included in Trustees' fees and expenses in the Statement of Operations amounted to $7,373. At January 31, 2006, the Fund had an accrued pension liability of $62,456 which is included in accrued expenses in the Statement of Assets and Liabilities. 10 <Page> The Fund has an unfunded Deferred Compensation Plan (the "Compensation Plan") which allows each independent Trustee to defer payment of all, or a portion, of the fees he receives for serving on the Board of Trustees. Each eligible Trustee generally may elect to have the deferred amounts credited with a return equal to the total return on one or more of the Morgan Stanley funds that are offered as investment options under the Compensation Plan. Appreciation/depreciation and distributions received from these investments are recorded with an offsetting increase/decrease in the deferred compensation obligation and do not affect the net asset value of the Fund. 5. SHARES OF BENEFICIAL INTEREST Transactions in shares of beneficial interest, at $1.00 per share, were as follows: <Table> <Caption> FOR THE YEAR FOR THE YEAR ENDED ENDED JANUARY 31, 2006 JANUARY 31, 2005 ---------------- ---------------- Shares sold 2,112,793,188 2,729,300,423 Shares issued in reinvestment of dividends 26,500,899 8,935,675 ---------------- ---------------- 2,139,294,087 2,738,236,098 Shares redeemed (2,324,215,872) (2,884,749,481) ---------------- ---------------- Net decrease (184,921,785) (146,513,383) ================ ================ </Table> 6. LEGAL MATTERS The Investment Adviser, certain affiliates of the Investment Adviser, certain officers of such affiliates and certain investment companies advised by the Investment Adviser or its affiliates, including the Fund, are named as defendants in a consolidated class action. This consolidated action also names as defendants certain individual Trustees and Directors of the Morgan Stanley funds. The consolidated amended complaint, filed in the United States District Court Southern District of New York on April 16, 2004, generally alleges that defendants, including the Fund, violated their statutory disclosure obligations and fiduciary duties by failing properly to disclose (i) that the Investment Adviser and certain affiliates of the Investment Adviser allegedly offered economic incentives to brokers and others to recommend the funds advised by the Investment Adviser or its affiliates to investors rather than funds managed by other companies, and (ii) that the funds advised by the Investment Adviser or its affiliates, including the Fund, allegedly paid excessive commissions to brokers in return for their efforts to recommend these funds to investors. The complaint seeks, among other things, unspecified compensatory damages, rescissionary damages, fees and costs. The defendants have moved to dismiss the action and intend to otherwise vigorously defend it. On March 9, 2005, Plaintiffs sought leave to supplement their complaint to assert claims on behalf of other investors. While the Fund and Adviser believe that each has meritorious defenses, the ultimate outcome of this matter is not presently determinable at this stage of the litigation, and no provision has been made in the Fund's financial statements for the effect, if any, of this matter. 11 <Page> MORGAN STANLEY U.S. GOVERNMENT MONEY MARKET TRUST FINANCIAL HIGHLIGHTS Selected ratios and per share data for a share of beneficial interest outstanding throughout each period: <Table> <Caption> FOR THE YEAR ENDED JANUARY 31, -------------------------------------------------------------------------- 2006 2005 2004 2003 2002 --------- --------- --------- --------- --------- SELECTED PER SHARE DATA: Net asset value, beginning of period $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00 --------- --------- --------- --------- --------- Net investment income from investment operations 0.027 0.008 0.004 0.011 0.032 Less dividends from net investment income (0.027) (0.008) (0.004) (0.011) (0.032) --------- --------- --------- --------- --------- Net asset value, end of period $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00 ========= ========= ========= ========= ========= TOTAL RETURN 2.71% 0.78% 0.45% 1.06% 3.25% RATIOS TO AVERAGE NET ASSETS: Expenses 0.75%(1) 0.73% 0.71%(1) 0.74%(1) 0.74%(1) Net investment income 2.62%(1) 0.74% 0.43%(1) 1.03%(1) 3.14%(1) SUPPLEMENTAL DATA: Net assets, end of period, in millions $ 938 $ 1,123 $ 1,269 $ 1,340 $ 1,257 </Table> - ---------- (1) IF THE FUND HAD BORNE ALL ITS EXPENSES THAT WERE REIMBURSED OR WAIVED BY THE INVESTMENT ADVISER AND ADMINISTRATOR, THE ANNUALIZED EXPENSE AND NET INVESTMENT INCOME RATIOS WOULD HAVE BEEN AS FOLLOWS: <Table> <Caption> EXPENSE NET INVESTMENT PERIOD ENDED RATIO INCOME RATIO ---------------- ------- -------------- JANUARY 31, 2006 0.76% 2.60% JANUARY 31, 2004 0.71 0.43 JANUARY 31, 2003 0.76 1.01 JANUARY 31, 2002 0.81 3.07 </Table> SEE NOTES TO FINANCIAL STATEMENTS 12 <Page> MORGAN STANLEY U.S. GOVERNMENT MONEY MARKET TRUST REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM TO THE SHAREHOLDERS AND BOARD OF TRUSTEES OF MORGAN STANLEY U.S. GOVERNMENT MONEY MARKET TRUST: We have audited the accompanying statement of assets and liabilities of Morgan Stanley U.S. Government Money Market Trust (the "Fund"), including the portfolio of investments, as of January 31, 2006, and the related statements of operations for the year then ended and changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended. These financial statements and financial highlights are the responsibility of the Fund's 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. The Fund is not required to have, nor were we engaged to perform, an audit of its 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 Fund's 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, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of January 31, 2006, by correspondence with the custodian and brokers; where replies were not received from brokers, we performed other auditing procedures. 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 Morgan Stanley U.S. Government Money Market Trust as of January 31, 2006, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended, in conformity with accounting principles generally accepted in the United States of America. DELOITTE & TOUCHE LLP NEW YORK, NEW YORK MARCH 23, 2006 13 <Page> MORGAN STANLEY U.S. GOVERNMENT MONEY MARKET TRUST TRUSTEE AND OFFICER INFORMATION INDEPENDENT TRUSTEES: <Table> <Caption> NUMBER OF PORTFOLIOS TERM OF IN FUND POSITION(S) OFFICE AND COMPLEX NAME, AGE AND ADDRESS OF HELD WITH LENGTH OF PRINCIPAL OCCUPATION(S) DURING OVERSEEN OTHER DIRECTORSHIPS INDEPENDENT TRUSTEE REGISTRANT TIME SERVED* PAST 5 YEARS** BY TRUSTEE*** HELD BY TRUSTEE - --------------------------------------- ----------- ------------ ------------------------------ ------------- -------------------- Michael Bozic (65) Trustee Since Private Investor; Director or 197 Director of various c/o Kramer Levin Naftalis & Frankel LLP April 1994 Trustee of the Retail Funds business Counsel to the Independent Trustees (since April 1994) and the organizations. 1177 Avenue of the Americas Institutional Funds (since New York, NY 10036 July 2003); formerly Vice Chairman of Kmart Corporation (December 1998-October 2000), Chairman and Chief Executive Officer of Levitz Furniture Corporation (November 1995-November 1998) and President and Chief Executive Officer of Hills Department Stores (May 1991-July 1995); formerly variously Chairman, Chief Executive Officer, President and Chief Operating Officer (1987-1991) of the Sears Merchandise Group of Sears, Roebuck & Co. Edwin J. Garn (73) Trustee Since Consultant; Director or 197 Director of Franklin 1031 N. Chartwell Court January 1993 Trustee of the Retail Funds Covey (time Salt Lake City, UT 84103 (since January 1993) and the management systems), Institutional Funds (since BMW Bank of North July 2003); member of the Utah America, Inc. Regional Advisory Board of (industrial loan Pacific Corp. (utility corporation), Escrow company); formerly Managing Bank USA (industrial Director of Summit Ventures loan corporation), LLC (2000-2004) (lobbying and United Space consulting firm); United Alliance (joint States Senator (R-Utah) venture between (1974-1992) and Chairman, Lockheed Martin and Senate Banking Committee the Boeing Company) (1980-1986), Mayor of Salt and Nuskin Asia Lake City, Utah (1971-1974), Pacific (multilevel Astronaut, Space Shuttle marketing); member Discovery (April 12-19, 1985), of the board of and Vice Chairman, Huntsman various civic and Corporation (chemical charitable company). organizations. Wayne E. Hedien (71) Trustee Since Retired; Director or Trustee 197 Director of The PMI c/o Kramer Levin Naftalis & Frankel LLP September of the Retail Funds (since Group Inc. (private Counsel to the Independent Trustees 1997 September 1997) and the mortgage insurance); 1177 Avenue of the Americas Institutional Funds (since Trustee and Vice New York, NY 10036 July 2003); formerly Chairman of The associated with the Allstate Field Museum of Companies (1966-1994), most Natural History; recently as Chairman of The director of various Allstate Corporation (March other business and 1993-December 1994) and charitable Chairman and Chief Executive organizations. Officer of its wholly-owned subsidiary, Allstate Insurance Company (July 1989-December 1994). </Table> 14 <Page> <Table> <Caption> NUMBER OF PORTFOLIOS TERM OF IN FUND POSITION(S) OFFICE AND COMPLEX NAME, AGE AND ADDRESS OF HELD WITH LENGTH OF PRINCIPAL OCCUPATION(S) DURING OVERSEEN OTHER DIRECTORSHIPS INDEPENDENT TRUSTEE REGISTRANT TIME SERVED* PAST 5 YEARS** BY TRUSTEE*** HELD BY TRUSTEE - --------------------------------------- ----------- ------------ ------------------------------ ------------- -------------------- Dr. Manuel H. Johnson (56) Trustee Since Senior Partner, Johnson 197 Director of NVR, c/o Johnson Smick Group, Inc. July 1991 Smick International, Inc., a Inc. (home 888 16th Street, NW consulting firm; Chairman of construction); Suite 740 the Audit Committee and Director of KFX Washington, D.C. 20006 Director or Trustee of the Energy; Director of Retail Funds (since July RBS Greenwich 1991) and the Institutional Capital Holdings Funds (since July 2003); (financial holding Co-Chairman and a founder of company). the Group of Seven Council (G7C), an international economic commission; formerly Vice Chairman of the Board of Governors of the Federal Reserve System and Assistant Secretary of the U.S. Treasury. Joseph J. Kearns (63) Trustee Since President, Kearns & 198 Director of Electro c/o Kearns & Associates LLC July 2003 Associates LLC (investment Rent Corporation PMB754 consulting); Deputy Chairman (equipment leasing), 23852 Pacific Coast Highway of the Audit Committee and The Ford Family Malibu, CA 90265 Director or Trustee of the Foundation, and the Retail Funds (since July UCLA Foundation. 2003) and the Institutional Funds (since August 1994); previously Chairman of the Audit Committee of the Institutional Funds (October 2001-July 2003); formerly CFO of the J. Paul Getty Trust. Michael E. Nugent (69) Trustee Since General Partner of Triumph 197 None. c/o Triumph Capital, L.P. July 1991 Capital, L.P., a private 445 Park Avenue investment partnership; New York, NY 10022 Chairman of the Insurance Committee and Director or Trustee of the Retail Funds (since July 1991) and the Institutional Funds (since July 2001); formerly Vice President, Bankers Trust Company and BT Capital Corporation (1984-1988). Fergus Reid (73) Trustee Since Chairman of Lumelite 198 Trustee and Director c/o Lumelite Plastics Corporation July 2003 Plastics Corporation; of certain 85 Charles Colman Blvd. Chairman of the Governance investment companies Pawling, NY 12564 Committee and Director or in the JPMorgan Trustee of the Retail Funds Funds complex (since July 2003) and the managed by J.P. Institutional Funds (since Morgan Investment June 1992). Management Inc. </Table> 15 <Page> INTERESTED TRUSTEES: <Table> <Caption> NUMBER OF PORTFOLIOS TERM OF IN FUND POSITION(S) OFFICE AND COMPLEX NAME, AGE AND ADDRESS OF HELD WITH LENGTH OF PRINCIPAL OCCUPATION(S) DURING OVERSEEN OTHER DIRECTORSHIPS INTERESTED TRUSTEE REGISTRANT TIME SERVED* PAST 5 YEARS** BY TRUSTEE*** HELD BY TRUSTEE - --------------------------------------- ----------- ------------ ------------------------------ ------------- -------------------- Charles A. Fiumefreddo (72) Chairman of Since Chairman and Director or 197 None. c/o Morgan Stanley Trust the Board July 1991 Trustee of the Retail Funds Harborside Financial Center, and Trustee (since July 1991) and the Plaza Two, Institutional Funds (since Jersey City, NJ 07311 July 2003); formerly Chief Executive Officer of the Retail Funds (until September 2002). James F. Higgins (57) Trustee Since Director or Trustee of the 197 Director of AXA c/o Morgan Stanley Trust June 2000 Retail Funds (since June Financial, Inc. and Harborside Financial Center, 2000) and the Institutional The Equitable Life Plaza Two, Funds (since July 2003); Assurance Society of Jersey City, NJ 07311 Senior Advisor of Morgan the United States Stanley (since August 2000); (financial Director of Dean Witter services). Realty Inc. </Table> - ---------- * THIS IS THE EARLIEST DATE THE TRUSTEE BEGAN SERVING THE FUNDS ADVISED BY MORGAN STANLEY INVESTMENT ADVISORS INC. (THE "INVESTMENT ADVISER") (THE "RETAIL FUNDS"). ** THE DATES REFERENCED BELOW INDICATING COMMENCEMENT OF SERVICES AS DIRECTOR/TRUSTEE FOR THE RETAIL FUNDS AND THE FUNDS ADVISED BY MORGAN STANLEY INVESTMENT MANAGEMENT INC. AND MORGAN STANLEY AIP GP LP (THE "INSTITUTIONAL FUNDS") REFLECT THE EARLIEST DATE THE DIRECTOR/TRUSTEE BEGAN SERVING THE RETAIL OR INSTITUTIONAL FUNDS, AS APPLICABLE. *** THE FUND COMPLEX INCLUDES ALL OPEN-END AND CLOSED-END FUNDS (INCLUDING ALL OF THEIR PORTFOLIOS) ADVISED BY THE INVESTMENT ADVISER AND ANY FUNDS THAT HAVE AN INVESTMENT ADVISER THAT IS AN AFFILIATED PERSON OF THE INVESTMENT ADVISER (INCLUDING, BUT NOT LIMITED TO, MORGAN STANLEY INVESTMENT MANAGEMENT INC.). 16 <Page> OFFICERS: <Table> <Caption> TERM OF POSITION(S) OFFICE AND NAME, AGE AND ADDRESS OF HELD WITH LENGTH OF EXECUTIVE OFFICER REGISTRANT TIME SERVED* PRINCIPAL OCCUPATION(S) DURING PAST 5 YEARS** - ------------------------------ -------------- ---------------- ----------------------------------------------------------------- Ronald E. Robison (67) President and Since May 2003 President (since September 2005) and Principal Executive Officer 1221 Avenue of the Americas Principal (since May 2003) of funds in the Fund Complex; President (since New York, NY 10020 Executive September 2005) and Principal Executive Officer (since May 2003) Officer of the Van Kampen Funds; Managing Director of Morgan Stanley, Morgan Stanley Investment Management and Morgan Stanley & Co. Incorporated; Managing Director and Director of Morgan Stanley Investment Advisors Inc.; Managing Director and (since May 2002) Director , Morgan Stanley Investment Management Inc., Managing Director and (since January 2005) Director of Van Kampen Asset Management and Van Kampen Investments Inc. Director, President (since February 2006) and Chief Executive Officer (since February 2006) of Morgan Stanley Services Company Inc., Director of Morgan Stanley Distributors Inc., Morgan Stanley Distribution, Inc. and Morgan Stanley Trust; Director of Morgan Stanley SICAV (since May 2004). Formerly, Executive Vice President (July 2003 to September 2005) of funds in the Fund Complex and the Van Kampen Funds; President and Director of the Institutional Funds (March 2001-July 2003), Chief Global Operating Officer of Morgan Stanley Investment Management Inc., Chief Administrative Officer of Morgan Stanley Investment Advisors Inc.; Chief Administrative Officer of Morgan Stanley Services Company Inc. (November 2003 to February 2006). J. David Germany (51) Vice President Since Managing Director and (since December 2005) Chief Investment 25 Cabot Square, Canary Wharf, February 2006 Officer - Global Fixed Income of Morgan Stanley Investment London, United Kingdom Advisors Inc., Morgan Stanley Investment Management Inc., Van E144QA Kampen Asset Management and Van Kampen Advisors Inc. Managing Director and Director of Morgan Stanley Investment Management Ltd. Vice President (since February 2006) of the Retail and Institutional Funds. Dennis F. Shea (52) Vice President Since Managing Director and (since February 2006) Chief Investment 1221 Avenue of the Americas February 2006 Officer - Global Equity of Morgan Stanley Investment Advisors New York, NY 10020 Inc., Morgan Stanley Investment Management Inc., Van Kampen Asset Management and Van Kampen Advisors Inc. Vice President (since February 2006) of the Retail and Institutional Funds. Formerly, Managing Director and Director of Global Equity Research at Morgan Stanley. Barry Fink (51) Vice President Since Managing Director of Morgan Stanley Investment Management, Morgan 1221 Avenue of the Americas February 1997 Stanley Investment Advisors Inc. and Morgan Stanley Investment New York, NY 10020 Management Inc.; Vice President of the Retail Funds and (since July 2003) the Institutional Funds; Formerly, General Counsel (May 2000-February 2006) of Morgan Stanley Investment Management; Secretary (October 2003 to February 2006), General Counsel (May 2004 to February 2006) and Director (July 1998 to January 2005) of Morgan Stanley Investment Advisors Inc. and Morgan Stanley Services Company Inc.; Secretary and General Counsel of Morgan Stanley Investment Management Inc. (November 2002 to February 2006); Secretary and Director of Morgan Stanley Distributors Inc.; Secretary (February 1997 to July 2003) and General Counsel (February 1997 to April 2004) of the Morgan Stanley Retail Funds; Vice President and Assistant General Counsel of Morgan Stanley Investment Advisors Inc. and Morgan Stanley Distributors Inc. (February 1997 to December 2001). </Table> 17 <Page> <Table> <Caption> TERM OF POSITION(S) OFFICE AND NAME, AGE AND ADDRESS OF HELD WITH LENGTH OF EXECUTIVE OFFICER REGISTRANT TIME SERVED* PRINCIPAL OCCUPATION(S) DURING PAST 5 YEARS** - ------------------------------ -------------- ---------------- ----------------------------------------------------------------- Amy R. Doberman (43) Vice President Since July 2004 Managing Director and General Counsel, U.S. Investment Management 1221 Avenue of the Americas (since July 2004); Vice President of the Retail Funds and the New York, NY 10020 Institutional Funds (since July 2004); Vice President of the Van Kampen Funds (since August 2004); Secretary (since February 2006) and Managing Director (since July 2004) of Morgan Stanley Investment Advisors Inc., Morgan Stanley Services Company Inc., Morgan Stanley Investment Management Inc., Van Kampen Asset Management, Van Kampen Advisors Inc. and Van Kampen Investments Inc.; Secretary (since February 2006) of Morgan Stanley Distributors Inc. and Morgan Stanley Distribution, Inc. Formerly, Managing Director and General Counsel - Americas, UBS Global Asset Management (July 2000 to July 2004). Carsten Otto (42) Chief Since Managing Director and U.S. Director of Compliance for Morgan 1221 Avenue of the Americas Compliance October 2004 Stanley Investment Management (since October 2004); Managing New York, NY 10020 Officer Director and Chief Compliance Officer (since February 2005) of Morgan Stanley Investment Advisors Inc. and Morgan Stanley Investment Management Inc. and (since June 2004) of Van Kampen Asset Management, Van Kampen Advisors Inc. and Van Kampen Investments Inc. Formerly, Assistant Secretary and Assistant General Counsel of the Retail Funds. Stefanie V. Chang (39) Vice President Since July 2003 Executive Director of Morgan Stanley & Co. Incorporated, Morgan 1221 Avenue of the Americas Stanley Investment Advisors Inc., Morgan Stanley Investment New York, NY 10020 Management Inc., Van Kampen Asset Management, Van Kampen Advisors Inc. and Van Kampen Investments Inc. Vice President of the Retail Funds (since July 2002) and the Institutional Funds (since December 1997). Formerly, Secretary of Van Kampen Asset Management Inc., Van Kampen Advisors Inc. and Van Kampen Investments Inc. (December 2002 to February 2006); Secretary of Morgan Stanley Distribution, Inc. (October 2005 to February 2006). Francis J. Smith (40) Treasurer and Treasurer since Executive Director of Morgan Stanley Investment Advisors Inc. and c/o Morgan Stanley Trust Chief July 2003 and Morgan Stanley Services Company Inc.; Treasurer and Chief Harborside Financial Center, Financial Chief Financial Financial Officer of the Morgan Stanley Retail Funds (since July Plaza Two, Officer Officer since 2003). Formerly Vice President of the Retail Funds (September Jersey City, NJ 07311 September 2002 2002-July 2003). Thomas F. Caloia (59) Vice President Since July 2003 Executive Director of Morgan Stanley Investment Advisors Inc. and c/o Morgan Stanley Trust Morgan Stanley Services Company Inc.; Assistant Treasurer of Harborside Financial Center, Morgan Stanley Investment Advisors Inc., Morgan Stanley Services Plaza Two, Company Inc. and Morgan Stanley Distributors Inc.; Vice President Jersey City, NJ 07311 of the Retail Funds. Formerly, Treasurer of the Retail Funds (April 1989-July 2003). </Table> 18 <Page> <Table> <Caption> TERM OF POSITION(S) OFFICE AND NAME, AGE AND ADDRESS OF HELD WITH LENGTH OF EXECUTIVE OFFICER REGISTRANT TIME SERVED* PRINCIPAL OCCUPATION(S) DURING PAST 5 YEARS** - ------------------------------ -------------- ---------------- ----------------------------------------------------------------- Mary E. Mullin (38) Secretary Since July 2003 Executive Director of Morgan Stanley & Co. Incorporated, Morgan 1221 Avenue of the Americas Stanley Investment Advisors Inc. and Morgan Stanley Investment New York, NY 10020 Management Inc. Secretary of the Retail Funds (since July 2003) and the Institutional Funds (since June 1999). </Table> - ---------- * THIS IS THE EARLIEST DATE THE OFFICER BEGAN SERVING THE RETAIL FUNDS. EACH OFFICER SERVES AN INDEFINITE TERM, UNTIL HIS OR HER SUCCESSOR IS ELECTED. ** THE DATES REFERENCED BELOW INDICATING COMMENCEMENT OF SERVICE AS AN OFFICER FOR THE RETAIL AND INSTITUTIONAL FUNDS REFLECT THE EARLIEST DATE THE OFFICER BEGAN SERVING THE RETAIL OR INSTITUTIONAL FUNDS, AS APPLICABLE. 2006 FEDERAL TAX NOTICE (UNAUDITED) Of the Fund's ordinary dividends paid during the fiscal year ended January 31, 2006, 50.91% was attributable to qualifying Federal obligations. Please consult your tax advisor to determine if any portion of the dividends you received is exempt from state income tax. 19 <Page> TRUSTEES Michael Bozic Charles A. Fiumefreddo Edwin J. Garn Wayne E. Hedien James F. Higgins Dr. Manuel H. Johnson Joseph J. Kearns Michael E. Nugent Fergus Reid OFFICERS Charles A. Fiumefreddo CHAIRMAN OF THE BOARD Ronald E. Robison PRESIDENT and PRINCIPAL EXECUTIVE OFFICER J. David Germany VICE PRESIDENT Dennis F. Shea VICE PRESIDENT Barry Fink VICE PRESIDENT Amy R. Doberman VICE PRESIDENT Carsten Otto CHIEF COMPLIANCE OFFICER Stefanie V. Chang VICE PRESIDENT Francis J. Smith TREASURER and CHIEF FINANCIAL OFFICER Thomas F. Caloia VICE PRESIDENT Mary E. Mullin SECRETARY TRANSFER AGENT Morgan Stanley Trust Harborside Financial Center, Plaza Two Jersey City, New Jersey 07311 INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM Deloitte & Touche LLP Two World Financial Center New York, New York 10281 INVESTMENT ADVISER Morgan Stanley Investment Advisors Inc. 1221 Avenue of the Americas New York, New York 10020 This report is submitted for the general information of the shareholders of the Fund. For more detailed information about the Fund, its fees and expenses and other pertinent information, please read its Prospectus. The Fund's Statement of Additional Information contains additional information about the Fund, including its trustees. It is available, without charge, by calling (800) 869-NEWS. This report is not authorized for distribution to prospective investors in the Fund unless preceded or accompanied by an effective Prospectus. Read the Prospectus carefully before investing. Investments and services offered through Morgan Stanley DW Inc., member SIPC. Morgan Stanley Distributors Inc., member NASD (C) 2006 Morgan Stanley [MORGAN STANLEY LOGO] 37960RPT-RA06-00215P-Y01/06 [GRAPHIC] MORGAN STANLEY FUNDS MORGAN STANLEY U.S. GOVERNMENT MONEY MARKET TRUST ANNUAL REPORT JANUARY 31, 2006 [MORGAN STANLEY LOGO] <Page> Item 2. Code of Ethics. (a) The Fund has adopted a code of ethics (the "Code of Ethics") that applies to its 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 Fund or a third party. (b) No information need be disclosed pursuant to this paragraph. (c) The Fund has amended its Code of Ethics during the period covered by the shareholder report presented in Item 1 hereto to delete from the end of the following paragraph on page 2 of the Code the phrase "to the detriment of the Fund.": "Each Covered Officer must not use his personal influence or personal relationship improperly to influence investment decisions or financial reporting by the Fund whereby the Covered Officer would benefit personally (directly or indirectly)." Additionally, Exhibit B was amended to remove Mitchell M. Merin as a covered officer. (d) Not applicable. (e) Not applicable. (f) (1) The Fund's Code of Ethics is attached hereto as Exhibit A. (2) Not applicable. (3) Not applicable. Item 3. Audit Committee Financial Expert. The Fund's Board of Trustees has determined that it has two "audit committee financial experts" serving on its audit committee, each of whom are "independent" Trustees: Dr. Manuel H. Johnson and Joseph J. Kearns. Under applicable securities laws, a person who is determined to be an audit committee financial expert will not be deemed an "expert" for any purpose, including without limitation for the purposes of Section 11 of the Securities Act of 1933, as a result of being designated or identified as an audit committee financial expert. The designation or identification of a person as an audit committee financial expert does not impose on such person any duties, obligations, or liabilities that are greater than the duties, obligations, and liabilities imposed on such person as a member of the audit committee and Board of Trustees in the absence of such designation or identification. <Page> MORGAN STANLEY U.S GOVT MONEY MARKET Item 4. Principal Accountant Fees and Services. (a)(b)(c)(d) and (g). Based on fees billed for the periods shown: 2006 <Table> Caption> REGISTRANT COVERED ENTITIES(1) AUDIT FEES $ 25,768 N/A NON-AUDIT FEES AUDIT-RELATED FEES $ 540 (2) $ 5,190,300 (2) TAX FEES $ 4,335 (3) $ 2,044,491 (4) ALL OTHER FEES $ - $ - TOTAL NON-AUDIT FEES $ 4,875 $ 7,234,791 TOTAL $ 30,643 $ 7,234,791 </Table> 2005 <Table> Caption> REGISTRANT COVERED ENTITIES(1) AUDIT FEES $ 23,689 N/A NON-AUDIT FEES AUDIT-RELATED FEES $ 684 (2) $ 3,746,495 (2) TAX FEES $ 4,757 (3) $ 79,800 (4) ALL OTHER FEES $ - $ - (5) TOTAL NON-AUDIT FEES $ 5,441 $ 3,826,295 TOTAL $ 29,130 $ 3,826,295 </Table> N/A- Not applicable, as not required by Item 4. (1) Covered Entities include the Adviser (excluding sub-advisors) and any entity controlling, controlled by or under common control with the Adviser that provides ongoing services to the Registrant. (2) Audit-Related Fees represent assurance and related services provided that are reasonably related to the performance of the audit of the financial statements of the Covered Entities' and funds advised by the Adviser or its affiliates, specifically data verification and agreed-upon procedures related to asset securitizations and agreed-upon procedures engagements. (3) Tax Fees represent tax compliance, tax planning and tax advice services provided in connection with the preparation and review of the Registrant's tax returns. (4) Tax Fees represent tax compliance, tax planning and tax advice services provided in connection with the review of Covered Entities' tax returns. (5) All other fees represent project management for future business applications and improving business and operational processes. <Page> (e)(1) The audit committee's pre-approval policies and procedures are as follows: APPENDIX A AUDIT COMMITTEE AUDIT AND NON-AUDIT SERVICES PRE-APPROVAL POLICY AND PROCEDURES OF THE MORGAN STANLEY RETAIL AND INSTITUTIONAL FUNDS AS ADOPTED AND AMENDED JULY 23, 2004,(1) 1. STATEMENT OF PRINCIPLES The Audit Committee of the Board is required to review and, in its sole discretion, pre-approve all Covered Services to be provided by the Independent Auditors to the Fund and Covered Entities in order to assure that services performed by the Independent Auditors do not impair the auditor's independence from the Fund. The SEC has issued rules specifying the types of services that an independent auditor may not provide to its audit client, as well as the audit committee's administration of the engagement of the independent auditor. The SEC's rules establish two different approaches to pre-approving services, which the SEC considers to be equally valid. Proposed services either: may be pre-approved without consideration of specific case-by-case services by the Audit Committee ("GENERAL PRE-APPROVAL"); or require the specific pre-approval of the Audit Committee or its delegate ("SPECIFIC PRE-APPROVAL"). The Audit Committee believes that the combination of these two approaches in this Policy will result in an effective and efficient procedure to pre-approve services performed by the Independent Auditors. As set forth in this Policy, unless a type of service has received general pre-approval, it will require specific pre-approval by the Audit Committee (or by any member of the Audit Committee to which pre-approval authority has been delegated) if it is to be provided by the Independent Auditors. Any proposed services exceeding pre-approved cost levels or budgeted amounts will also require specific pre-approval by the Audit Committee. The appendices to this Policy describe the Audit, Audit-related, Tax and All Other services that have the general pre-approval of the Audit Committee. The term of any general pre-approval is 12 months from the date of pre-approval, unless the Audit Committee considers and provides a different period and states otherwise. The Audit Committee will annually review and pre-approve the services that may be provided by the Independent Auditors without obtaining specific pre-approval from the Audit Committee. The Audit Committee will add to or subtract from the list of general pre-approved services from time to time, based on subsequent determinations. - ---------- (1) This Audit Committee Audit and Non-Audit Services Pre-Approval Policy and Procedures (the "POLICY"), adopted as of the date above, supersedes and replaces all prior versions that may have been adopted from time to time. <Page> The purpose of this Policy is to set forth the policy and procedures by which the Audit Committee intends to fulfill its responsibilities. It does not delegate the Audit Committee's responsibilities to pre-approve services performed by the Independent Auditors to management. The Fund's Independent Auditors have reviewed this Policy and believes that implementation of the Policy will not adversely affect the Independent Auditors' independence. 2. DELEGATION As provided in the Act and the SEC's rules, the Audit Committee may delegate either type of pre-approval authority to one or more of its members. The member to whom such authority is delegated must report, for informational purposes only, any pre-approval decisions to the Audit Committee at its next scheduled meeting. 3. AUDIT SERVICES The annual Audit services engagement terms and fees are subject to the specific pre-approval of the Audit Committee. Audit services include the annual financial statement audit and other procedures required to be performed by the Independent Auditors to be able to form an opinion on the Fund's financial statements. These other procedures include information systems and procedural reviews and testing performed in order to understand and place reliance on the systems of internal control, and consultations relating to the audit. The Audit Committee will approve, if necessary, any changes in terms, conditions and fees resulting from changes in audit scope, Fund structure or other items. In addition to the annual Audit services engagement approved by the Audit Committee, the Audit Committee may grant general pre-approval to other Audit services, which are those services that only the Independent Auditors reasonably can provide. Other Audit services may include statutory audits and services associated with SEC registration statements (on Forms N-1A, N-2, N-3, N-4, etc.), periodic reports and other documents filed with the SEC or other documents issued in connection with securities offerings. The Audit Committee has pre-approved the Audit services in Appendix B.1. All other Audit services not listed in Appendix B.1 must be specifically pre-approved by the Audit Committee (or by any member of the Audit Committee to which pre-approval has been delegated). 4. AUDIT-RELATED SERVICES Audit-related services are assurance and related services that are reasonably related to the performance of the audit or review of the Fund's financial statements and, to the extent they are Covered Services, the Covered Entities or that are traditionally performed by the Independent Auditors. Because the Audit Committee believes that the provision of Audit-related services does not impair the independence of the auditor and is consistent with the SEC's rules on auditor independence, the Audit Committee may grant general pre-approval to Audit-related services. Audit-related services include, among others, accounting consultations related to accounting, financial reporting or disclosure matters <Page> not classified as "Audit services"; assistance with understanding and implementing new accounting and financial reporting guidance from rulemaking authorities; agreed-upon or expanded audit procedures related to accounting and/or billing records required to respond to or comply with financial, accounting or regulatory reporting matters; and assistance with internal control reporting requirements under Forms N-SAR and/or N-CSR. The Audit Committee has pre-approved the Audit-related services in Appendix B.2. All other Audit-related services not listed in Appendix B.2 must be specifically pre-approved by the Audit Committee (or by any member of the Audit Committee to which pre-approval has been delegated). 5. TAX SERVICES The Audit Committee believes that the Independent Auditors can provide Tax services to the Fund and, to the extent they are Covered Services, the Covered Entities, such as tax compliance, tax planning and tax advice without impairing the auditor's independence, and the SEC has stated that the Independent Auditors may provide such services. Pursuant to the preceding paragraph, the Audit Committee has pre-approved the Tax Services in Appendix B.3. All Tax services in Appendix B.3 must be specifically pre-approved by the Audit Committee (or by any member of the Audit Committee to which pre-approval has been delegated). 6. ALL OTHER SERVICES The Audit Committee believes, based on the SEC's rules prohibiting the Independent Auditors from providing specific non-audit services, that other types of non-audit services are permitted. Accordingly, the Audit Committee believes it may grant general pre-approval to those permissible non-audit services classified as All Other services that it believes are routine and recurring services, would not impair the independence of the auditor and are consistent with the SEC's rules on auditor independence. The Audit Committee has pre-approved the All Other services in Appendix B.4. Permissible All Other services not listed in Appendix B.4 must be specifically pre-approved by the Audit Committee (or by any member of the Audit Committee to which pre-approval has been delegated). 7. PRE-APPROVAL FEE LEVELS OR BUDGETED AMOUNTS Pre-approval fee levels or budgeted amounts for all services to be provided by the Independent Auditors will be established annually by the Audit Committee. Any proposed services exceeding these levels or amounts will require specific pre-approval by the Audit Committee. The Audit Committee is mindful of the overall relationship of fees for audit and non-audit services in determining whether to pre-approve any such services. 8. PROCEDURES All requests or applications for services to be provided by the Independent Auditors that do not require specific approval by the Audit Committee will be submitted to the Fund's Chief Financial Officer and must include a detailed description of the services to be <Page> rendered. The Fund's Chief Financial Officer will determine whether such services are included within the list of services that have received the general pre-approval of the Audit Committee. The Audit Committee will be informed on a timely basis of any such services rendered by the Independent Auditors. Requests or applications to provide services that require specific approval by the Audit Committee will be submitted to the Audit Committee by both the Independent Auditors and the Fund's Chief Financial Officer, and must include a joint statement as to whether, in their view, the request or application is consistent with the SEC's rules on auditor independence. The Audit Committee has designated the Fund's Chief Financial Officer to monitor the performance of all services provided by the Independent Auditors and to determine whether such services are in compliance with this Policy. The Fund's Chief Financial Officer will report to the Audit Committee on a periodic basis on the results of its monitoring. Both the Fund's Chief Financial Officer and management will immediately report to the chairman of the Audit Committee any breach of this Policy that comes to the attention of the Fund's Chief Financial Officer or any member of management. 9. ADDITIONAL REQUIREMENTS The Audit Committee has determined to take additional measures on an annual basis to meet its responsibility to oversee the work of the Independent Auditors and to assure the auditor's independence from the Fund, such as reviewing a formal written statement from the Independent Auditors delineating all relationships between the Independent Auditors and the Fund, consistent with Independence Standards Board No. 1, and discussing with the Independent Auditors its methods and procedures for ensuring independence. 10. COVERED ENTITIES Covered Entities include the Fund's investment adviser(s) and any entity controlling, controlled by or under common control with the Fund's investment adviser(s) that provides ongoing services to the Fund(s). Beginning with non-audit service contracts entered into on or after May 6, 2003, the Fund's audit committee must pre-approve non-audit services provided not only to the Fund but also to the Covered Entities if the engagements relate directly to the operations and financial reporting of the Fund. This list of Covered Entities would include: MORGAN STANLEY RETAIL FUNDS Morgan Stanley Investment Advisors Inc. Morgan Stanley & Co. Incorporated Morgan Stanley DW Inc. Morgan Stanley Investment Management Inc. Morgan Stanley Investment Management Limited Morgan Stanley Investment Management Private Limited Morgan Stanley Asset & Investment Trust Management Co., Limited Morgan Stanley Investment Management Company Van Kampen Asset Management Morgan Stanley Services Company, Inc. Morgan Stanley Distributors Inc. Morgan Stanley Trust FSB <Page> MORGAN STANLEY INSTITUTIONAL FUNDS Morgan Stanley Investment Management Inc. Morgan Stanley Investment Advisors Inc. Morgan Stanley Investment Management Limited Morgan Stanley Investment Management Private Limited Morgan Stanley Asset & Investment Trust Management Co., Limited Morgan Stanley Investment Management Company Morgan Stanley & Co. Incorporated Morgan Stanley Distribution, Inc. Morgan Stanley AIP GP LP Morgan Stanley Alternative Investment Partners LP (e)(2) Beginning with non-audit service contracts entered into on or after May 6, 2003, the audit committee also is required to pre-approve services to Covered Entities to the extent that the services are determined to have a direct impact on the operations or financial reporting of the Registrant. 100% of such services were pre-approved by the audit committee pursuant to the Audit Committee's pre-approval policies and procedures (attached hereto). (f) Not applicable. (g) See table above. (h) The audit committee of the Board of Trustees has considered whether the provision of services other than audit services performed by the auditors to the Registrant and Covered Entities is compatible with maintaining the auditors' independence in performing audit services. Item 5. Audit Committee of Listed Registrants. (a) The Fund has a separately-designated standing audit committee established in accordance with Section 3(a)(58)(A) of the Exchange Act whose members are: Michael Bozic, Edwin J. Garn, Wayne E. Hedien, Manual H. Johnson, Joseph J. Kearns, Michael Nugent and Fergus Reid. (b) Not applicable. Item 6. Schedule of Investments Refer to Item 1. <Page> Item 7. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies. Applicable only to reports filed by closed-end funds. Item 8. Portfolio Managers of Closed-End Management Investment Companies Applicable only to reports filed by closed-end funds. Item 9. Closed-End Fund Repurchases Applicable only to reports filed by closed-end funds. Item 10. Submission of Matters to a Vote of Security Holders Not applicable. Item 11. Controls and Procedures (a) The Fund's principal executive officer and principal financial officer have concluded that the Fund's disclosure controls and procedures are sufficient to ensure that information required to be disclosed by the Fund in this Form N-CSR was recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms, based upon such officers' evaluation of these controls and procedures as of a date within 90 days of the filing date of the report. (b) There were no changes in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal half-year (the registrant's second fiscal half-year in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. Item 12. Exhibits (a) The Code of Ethics for Principal Executive and Senior Financial Officers is attached hereto. (b) A separate certification for each principal executive officer and principal financial officer of the registrant are attached hereto as part of EX-99.CERT. <Page> 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. Morgan Stanley U.S. Government Money Market Trust /s/ Ronald E. Robison Ronald E. Robison Principal Executive Officer March 23, 2006 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed by the following persons on behalf of the registrant and in the capacities and on the dates indicated. /s/ Ronald E. Robison Ronald E. Robison Principal Executive Officer March 23, 2006 /s/ Francis Smith Francis Smith Principal Financial Officer March 23, 2006