<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: 811-09713 Active Assets Institutional Money 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: June 30, 2004 Date of reporting period: June 30, 2004 Item 1 - Report to Shareholders <Page> WELCOME, SHAREHOLDER: IN THIS REPORT, YOU'LL LEARN ABOUT HOW YOUR INVESTMENT IN ACTIVE ASSETS INSTITUTIONAL MONEY 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 THE FUND WILL ACHIEVE ITS INVESTMENT OBJECTIVE. THE FUND IS SUBJECT TO MARKET RISK, WHICH IS THE POSSIBILITY THAT MARKET VALUES OF SECURITIES OWNED BY THE FUND WILL DECLINE AND, THEREFORE, THE VALUE OF THE FUND'S SHARES MAY BE LESS THAN WHAT YOU PAID FOR THEM. ACCORDINGLY, YOU CAN LOSE MONEY INVESTING IN THIS FUND. <Page> Fund Report For the year ended June 30, 2004 MARKET CONDITIONS The Federal Open Market Committee (the "Fed") maintained its target rate for federal funds at 1.00 percent, a 45-year low, for the entire fiscal period of this report. However, on June 30, 2004 it raised that target to 1.25 percent, the first increase in more than four years. This increase came on the heels of a string of positive employment reports as well as rising costs for commodities. The level of forward interest rates at the end of the review period indicated a widespread expectation by investors that the Fed would continue to raise interest rates by at least one percentage point. While it is impossible to predict with any certainty, such a sustained increase in rates would provide money market investors an opportunity to invest in securities with more attractive yields than have been available for some time. PERFORMANCE ANALYSIS As of June 30, 2004, Active Assets Institutional Money Trust had net assets of more than $936 million and an average portfolio maturity of 27 days. For the 12-month period ended June 30, 2004, the Fund provided a total return of 0.91 percent. For the seven-day period ended June 30, 2004, the Fund provided an effective annualized yield and a current yield both of 0.97 percent; its 30-day moving average yield for June was 0.92 percent. PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. Our strategy in managing the Fund remained consistent with the Fund's long-term focus on maintaining preservation of capital and very high liquidity. We adhered to a conservative approach in managing the Fund that emphasized purchasing high-quality money market obligations and avoided the use of derivatives that might fluctuate excessively with changing interest rates. 2 <Page> <Table> PORTFOLIO COMPOSITION Commercial Paper 60.0% Floating Rate Notes 19.4 Repurchase Agreement 11.2 Certificates of Deposit 6.0 Promissory Note 3.4 MATURITY SCHEDULE 1 - 30 Days 67.1% 31 - 60 Days 21.3 61 - 90 Days 9.4 91 - 120 Days 1.0 121 + Days 1.2 </Table> DATA AS OF JUNE 30, 2004. SUBJECT TO CHANGE DAILY. ALL PERCENTAGES FOR PORTFOLIO COMPOSITION AND MATURITY SCHEDULE ARE AS A PERCENTAGE OF TOTAL INVESTMENTS. PROVIDED FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE DEEMED A RECOMMENDATION TO BUY OR SELL THE SECURITIES MENTIONED. MORGAN STANLEY IS A FULL-SERVICE SECURITIES FIRM ENGAGED IN SECURITIES TRADING AND BROKERAGE ACTIVITIES, INVESTMENT BANKING, RESEARCH AND ANALYSIS, FINANCING AND FINANCIAL ADVISORY SERVICES. INVESTMENT STRATEGY THE FUND INVESTS IN HIGH QUALITY, SHORT-TERM DEBT OBLIGATIONS. IN SELECTING INVESTMENTS, THE "INVESTMENT MANAGER," 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. ANNUAL 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> ACTIVE ASSETS INSTITUTIONAL MONEY TRUST PORTFOLIO OF INVESTMENTS - JUNE 30, 2004 <Table> <Caption> ANNUALIZED PRINCIPAL YIELD AMOUNT IN ON DATE OF THOUSANDS DESCRIPTION AND MATURITY DATES PURCHASE VALUE - ---------------------------------------------------------------------------------------------------------- COMMERCIAL PAPER (60.0%) ASSET-BACKED - AUTO (5.8%) $ 4,086 DaimlerChrysler Revolving Auto Conduit 08/09/04 1.31% $ 4,080,201 10,000 DaimlerChrysler Revolving Auto Conduit Series II 07/28/04 1.32 9,990,100 40,000 FCAR Owner Trust 07/01/04 - 09/15/04 1.06 - 1.52 39,960,057 ------------- 54,030,358 ------------- ASSET-BACKED - CONSUMER (10.4%) 6,000 Barton Capital Corp. - 144A* 07/08/04 1.08 5,998,740 27,000 Gemini Securitization Co. - 144A* 07/06/04 - 07/22/04 1.11 - 1.25 26,984,338 12,000 Mont Blanc Capital Corp. - 144A* 07/13/04 1.11 11,995,560 19,000 Old Line Funding Corp. - 144A* 08/10/04 1.30 - 1.33 18,972,222 33,009 Thames Asset Global Securitization - 144A* 07/16/04 - 07/19/04 1.13 - 1.24 32,991,087 ------------- 96,941,947 ------------- ASSET-BACKED - CORPORATE (3.0%) 9,000 Amsterdam Funding Corp. - 144A* 07/06/04 1.10 8,998,625 19,000 Variable Funding Corp. - 144A* 07/07/04 - 07/09/04 1.09 - 1.10 18,995,920 ------------- 27,994,545 ------------- ASSET-BACKED - DIVERSIFIED (0.5%) 5,000 Falcon Asset Securitization Corp. - 144A* 07/21/04 1.25 4,996,528 ------------- ASSET-BACKED - MORTGAGES (4.9%) 7,000 Mortgage Interest Networking Trust Series A1 P1 08/02/04 1.22 6,992,409 30,000 Mortgage Interest Networking Trust Series A1+P1 07/07/04 - 08/16/04 1.12 - 1.33 29,956,581 9,000 Sydney Capital Corp. - 144A* 07/26/04 - 09/13/04 1.30 - 1.51 8,983,152 ------------- 45,932,142 ------------- </Table> SEE NOTES TO FINANCIAL STATEMENTS 4 <Page> <Table> <Caption> ANNUALIZED PRINCIPAL YIELD AMOUNT IN ON DATE OF THOUSANDS DESCRIPTION AND MATURITY DATES PURCHASE VALUE - ---------------------------------------------------------------------------------------------------------- ASSET-BACKED - SECURITIES (9.9%) $ 12,038 Amstel Funding Corp. - 144A* 07/15/04 - 09/22/04 1.15 - 1.54% $ 12,012,149 11,325 Beta Finance - 144A* 07/20/04 - 10/08/04 1.15 - 1.20 11,301,017 13,000 Cancara Asset Securitization Ltd. - 144A* 07/27/04 - 08/18/04 1.09 - 1.21 12,983,983 11,233 CC USA Inc. - 144A* 07/20/04 - 10/20/04 1.10 - 1.28 11,216,230 18,000 Clipper Receivables Corp. - 144A* 07/07/04 - 07/12/04 1.07 - 1.10 17,995,528 27,000 Dorada Finance Inc. - 144A* 07/16/04 - 07/30/04 1.10 - 1.36 26,982,464 ------------- 92,491,371 ------------- BANKING (4.1%) 32,000 Citicorp 07/06/04 - 07/12/04 1.10 - 1.14 31,991,200 6,000 Northern Trust Corp. 07/02/04 1.07 5,999,822 ------------- 37,991,022 ------------- FINANCE - CORPORATE (2.1%) 20,000 CIT Group Inc. 07/01/04 - 07/13/04 1.08 - 1.15 19,996,167 ------------- FINANCIAL CONGLOMERATES (2.5%) 24,000 General Electric Capital Corp. 07/08/04 - 12/20/04 1.08 - 1.87 23,906,801 ------------- INTERNATIONAL BANKS (16.8%) 4,200 ANZ (DE) Inc. 07/07/04 1.15 4,199,195 35,000 Danske Corp. 08/06/04 - 09/28/04 1.07 - 1.11 34,931,089 12,000 Fortis Funding LLC 08/16/04 1.10 11,983,133 40,000 HBOS Treasury Services PLC 08/11/04 - 09/01/04 1.07 - 1.12 39,935,907 10,000 KBC Financial Products International Ltd. - 144A* 08/04/04 1.10 9,989,611 </Table> SEE NOTES TO FINANCIAL STATEMENTS 5 <Page> <Table> <Caption> ANNUALIZED PRINCIPAL YIELD AMOUNT IN ON DATE OF THOUSANDS DESCRIPTION AND MATURITY DATES PURCHASE VALUE - ---------------------------------------------------------------------------------------------------------- $ 30,000 KFW International Finance Inc. 08/19/04 - 09/07/04 1.07 - 1.15% $ 29,953,164 11,000 Natexis Banques Populaires U.S. Finance LLC 07/02/04 - 07/22/04 1.08 10,997,271 15,000 Westpac Capital Corp. 08/18/04 1.05 14,979,000 ------------- 156,968,370 ------------- TOTAL COMMERCIAL PAPER (COST $561,249,251) 561,249,251 ------------- FLOATING RATE NOTES (19.4%) ASSET-BACKED - SECURITIES (1.1%) 10,000 CC USA Inc. - 144A* 07/26/04++ 1.24+ 9,998,164 ------------- BANKING (3.7%) 10,000 SunTrust Bank 07/01/04++ 1.18+ 9,999,240 25,000 Wells Fargo Bank, N.A. 07/01/04++ 1.05+ 25,000,000 ------------- 34,999,240 ------------- FINANCE - AUTO (4.3%) 12,000 American Honda Finance Corp. - 144A* 08/11/04++ 1.30+ 12,005,984 28,000 Toyota Motor Credit Corp. 07/01/04++ 1.27+ 28,009,798 ------------- 40,015,782 ------------- INSURANCE (4.3%) 30,000 AIG SunAmerica Global VIII - 144A* 07/15/04++ 1.36+ 30,019,388 10,000 Allstate Financial Global Funding - 144A* 07/01/04++ 1.47+ 10,024,057 ------------- 40,043,445 ------------- INTERNATIONAL BANKS (6.0%) 37,000 Barclays Bank PLC 07/26/04++ 1.22+ 36,994,469 9,700 Deutsche Bank AG 08/18/04++ 1.31+ 9,706,584 </Table> SEE NOTES TO FINANCIAL STATEMENTS 6 <Page> <Table> <Caption> ANNUALIZED PRINCIPAL YIELD AMOUNT IN ON DATE OF THOUSANDS DESCRIPTION AND MATURITY DATES PURCHASE VALUE - ---------------------------------------------------------------------------------------------------------- $ 10,000 Westpac Banking Corp. 07/26/04++ 1.14+% $ 10,002,081 ------------- 56,703,134 ------------- TOTAL FLOATING RATE NOTES (COST $181,759,765) 181,759,765 ------------- REPURCHASE AGREEMENT (11.2%) 104,740 Goldman, Sachs & Co. due 07/01/04 (dated 06/30/04; proceeds $104,744,510) (a) (COST $104,740,000) 1.55 104,740,000 ------------- CERTIFICATES OF DEPOSIT (6.0%) 20,000 Fifth Third Bank 09/20/04 1.06 20,000,448 6,000 Fortis Bank, NY Branch 08/24/04 1.14 6,000,000 5,000 Natexis Banques Populaires, NY Branch 09/14/04 1.42 5,000,052 25,000 UBS AG, Stamford Branch 07/01/04 1.10 25,000,000 ------------- TOTAL CERTIFICATES OF DEPOSIT (COST $56,000,500) 56,000,500 ------------- PROMISSORY NOTE (3.4%) INVESTMENTS BANKS/BROKERS 32,000 Goldman Sachs Group Inc. - 144A* 07/01/04++(COST $32,000,000) 1.27+ 32,000,000 ------------- TOTAL INVESTMENTS (COST $935,749,516) (b) 100.0% 935,749,516 OTHER ASSETS IN EXCESS OF LIABILITIES 0.0 308,523 ----------- ------------- NET ASSETS 100.0% $ 936,058,039 =========== ============= </Table> - ---------- * RESALE IS RESTRICTED TO QUALIFIED INSTITUTIONAL INVESTORS. + RATE SHOWN IS THE RATE IN EFFECT AT JUNE 30, 2004. ++ DATE OF NEXT INTEREST RATE RESET. (a) COLLATERALIZED BY FEDERAL NATIONAL MORTGAGE ASSOC. 8.00% DUE 06/01/31 VALUED AT $106,834,800. (b) COST IS THE SAME FOR FEDERAL INCOME TAX PURPOSES. SEE NOTES TO FINANCIAL STATEMENTS 7 <Page> ACTIVE ASSETS INSTITUTIONAL MONEY TRUST FINANCIAL STATEMENTS STATEMENT OF ASSETS AND LIABILITIES JUNE 30, 2004 <Table> ASSETS: Investments in securities, at value (cost $935,749,516) (including a repurchase agreement of $104,740,000) $ 935,749,516 Cash 5,539 Interest receivable 475,668 Prepaid expenses and other assets 21,395 ---------------- TOTAL ASSETS 936,252,118 ---------------- LIABILITIES: Payable for: Investment management fee 105,741 Dividends to shareholders 27,193 Accrued expenses and other payables 61,145 ---------------- TOTAL LIABILITIES 194,079 ---------------- NET ASSETS $ 936,058,039 ================ COMPOSITION OF NET ASSETS: Paid-in-capital $ 935,948,754 Accumulated undistributed net investment income 109,285 ---------------- NET ASSETS $ 936,058,039 ================ NET ASSET VALUE PER SHARE, 936,058,054 SHARES OUTSTANDING (UNLIMITED SHARES AUTHORIZED OF $.01 PAR VALUE) $ 1.00 ================ </Table> STATEMENT OF OPERATIONS FOR THE YEAR ENDED JUNE 30, 2004 <Table> NET INVESTMENT INCOME: INTEREST INCOME $ 11,656,323 ---------------- EXPENSES Investment management fee 1,611,553 Shareholder reports and notices 64,459 Professional fees 63,661 Registration fees 57,162 Custodian fees 49,577 Trustees' fees and expenses 14,899 Transfer agent fees and expenses 2,936 Other 54,817 ---------------- TOTAL EXPENSES 1,919,064 Less: amounts waived (550) ---------------- NET EXPENSES 1,918,514 ---------------- NET INVESTMENT INCOME 9,737,809 NET REALIZED GAIN 1,245 ---------------- NET INCREASE $ 9,739,054 ================ </Table> SEE NOTES TO FINANCIAL STATEMENTS 8 <Page> STATEMENT OF CHANGES IN NET ASSETS <Table> <Caption> FOR THE YEAR FOR THE YEAR ENDED ENDED JUNE 30, 2004 JUNE 30, 2003 ---------------- ---------------- INCREASE (DECREASE) IN NET ASSETS: OPERATIONS: Net investment income $ 9,737,809 $ 16,141,230 Net realized gain 1,245 8,900 ---------------- ---------------- NET INCREASE 9,739,054 16,150,130 ---------------- ---------------- DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS FROM: Net investment income (9,737,824) (16,141,230) Net realized gain (1,245) (8,900) ---------------- ---------------- TOTAL DIVIDENDS AND DISTRIBUTIONS (9,739,069) (16,150,130) ---------------- ---------------- Net decrease from transactions in shares of beneficial interest (212,407,462) (4,293,399) ---------------- ---------------- NET DECREASE (212,407,477) (4,293,399) NET ASSETS: Beginning of period 1,148,465,516 1,152,758,915 ---------------- ---------------- END OF PERIOD (INCLUDING ACCUMULATED UNDISTRIBUTED NET INVESTMENT INCOME OF $109,285 AND $109,300, RESPECTIVELY) $ 936,058,039 $ 1,148,465,516 ================ ================ </Table> SEE NOTES TO FINANCIAL STATEMENTS 9 <Page> ACTIVE ASSETS INSTITUTIONAL MONEY TRUST NOTES TO FINANCIAL STATEMENTS - JUNE 30, 2004 1. ORGANIZATION AND ACCOUNTING POLICIES Active Assets Institutional Money 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 objective is high current income, preservation of capital and liquidity. The Fund was organized as a Massachusetts business trust on November 23, 1999 and commenced operations on February 15, 2000. The following is a summary of significant accounting policies: A. VALUATION OF INVESTMENTS -- Portfolio securities are valued at amortized cost, which approximates market value. 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 MANAGEMENT AGREEMENT Pursuant to an Investment Management Agreement with Morgan Stanley Investment Advisors Inc. (the "Investment Manager"), the Fund pays the Investment Manager a management fee, accrued daily and payable monthly, by applying the annual rate of 0.15% to the net assets of the Fund determined as of the close of each business day. 10 <Page> The Investment Manager has agreed to reimburse all operating expenses and to waive the compensation provided for in its Investment Management Agreement to the extent that such expenses and compensation on an annualized basis exceed 0.20% of the daily net assets of the Fund. 3. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES The cost of purchases and proceeds from sales/maturities of portfolio securities for the year ended June 30, 2004, aggregated $38,657,857,958 and $38,877,881,608, respectively. Morgan Stanley Trust, an affiliate of the Investment Manager, is the Fund's transfer agent. Effective April 1, 2004, the Fund began 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. 4. 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 JUNE 30, 2004 JUNE 30, 2003 -------------- -------------- Shares sold 3,918,519,756 4,177,514,450 Shares issued in reinvestment of dividends and distributions 9,744,521 16,254,374 -------------- -------------- 3,928,264,277 4,193,768,824 Shares redeemed (4,140,671,739) (4,198,062,223) -------------- -------------- Net decrease in shares outstanding (212,407,462) (4,293,399) ============== ============== </Table> 5. LEGAL MATTERS The Investment Manager, certain affiliates of the Investment Manager, certain officers of such affiliates and certain investment companies advised by the Investment Manager or its affiliates, including the Fund, are named as defendants in a number of similar class action complaints which were recently consolidated. This consolidated action also names as defendants certain individual Trustees and Directors of the Morgan Stanley funds. The consolidated amended complaint generally alleges that defendants, including the Fund, violated their statutory disclosure obligations and fiduciary duties by failing properly to disclose (i) that the Investment Manager and certain affiliates of the Investment 11 <Page> Manager allegedly offered economic incentives to brokers and others to recommend the funds advised by the Investment Manager or its affiliates to investors rather than funds managed by other companies, and (ii) that the funds advised by the Investment Manager 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. While the Fund believes that it has meritorious defenses, the ultimate outcome of this matter is not presently determinable at this early stage of the litigation, and no provision has been made in the Fund's financial statements for the effect, if any, of this matter. 12 <Page> ACTIVE ASSETS INSTITUTIONAL MONEY TRUST FINANCIAL HIGHLIGHTS Selected ratios and per share data for a share of beneficial interest outstanding throughout each period: <Table> <Caption> FOR THE PERIOD FOR THE YEAR ENDED JUNE 30, FEBRUARY 15, 2000* ------------------------------------------------------------ THROUGH 2004 2003 2002 2001 JUNE 30, 2000 ------------ ------------ ------------ ------------ ------------------ SELECTED PER SHARE DATA: Net asset value, beginning of period $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00 ------------ ------------ ------------ ------------ ------------------ Net income from investment operations 0.009 0.014 0.024 0.058 0.023 Less dividends from net investment income (0.009)+ (0.014)+ (0.024)+ (0.058)+ (0.023) ------------ ------------ ------------ ------------ ------------------ Net asset value, end of period $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00 ============ ============ ============ ============ ================== TOTAL RETURN 0.91% 1.37% 2.45% 5.95% 2.31%(1) RATIOS TO AVERAGE NET ASSETS: Expenses 0.18% 0.17% 0.17% 0.19% 0.20%(2)(3) Net investment income 0.91% 1.36% 2.40% 5.61% 6.12%(2)(3) SUPPLEMENTAL DATA: Net assets, end of period, in millions $ 936 $ 1,148 $ 1,153 $ 1,146 $ 813 </Table> - ---------- * COMMENCEMENT OF OPERATIONS. + INCLUDES CAPITAL GAIN DISTRIBUTION OF LESS THAN $0.001. (1) NOT ANNUALIZED. (2) ANNUALIZED. (3) IF THE FUND HAD BORNE ALL OF ITS EXPENSES THAT WERE REIMBURSED OR WAIVED BY THE INVESTMENT MANAGER, THE ANNUALIZED EXPENSE AND NET INVESTMENT INCOME RATIOS WOULD HAVE BEEN 0.31% AND 6.01%, RESPECTIVELY. SEE NOTES TO FINANCIAL STATEMENTS 13 <Page> ACTIVE ASSETS INSTITUTIONAL MONEY TRUST REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM TO THE SHAREHOLDERS AND BOARD OF TRUSTEES OF ACTIVE ASSETS INSTITUTIONAL MONEY TRUST: We have audited the accompanying statement of assets and liabilities of Active Assets Institutional Money Trust (the "Fund"), including the portfolio of investments, as of June 30, 2004, 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 periods presented. 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. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. Our procedures included confirmation of securities owned as of June 30, 2004, by correspondence with the custodian. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. 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 Active Assets Institutional Money Trust as of June 30, 2004, 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 periods presented, in conformity with accounting principles generally accepted in the United States of America. Deloitte & Touche LLP NEW YORK, NEW YORK AUGUST 13, 2004 2004 FEDERAL TAX NOTICE (UNAUDITED) Of the Fund's ordinary income dividends paid during the fiscal year ended June 30, 2004, 1.84% 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. 14 <Page> ACTIVE ASSETS INSTITUTIONAL MONEY 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 PAST OVERSEEN OTHER DIRECTORSHIPS INDEPENDENT TRUSTEE REGISTRANT TIME SERVED* 5 YEARS** BY TRUSTEE*** HELD BY TRUSTEE - --------------------------- ----------- ------------ ----------------------------------- ------------- -------------------- Michael Bozic (63) Trustee Since Private Investor; Director or 208 Director of Weirton c/o Kramer Levin Naftalis & April 1994 Trustee of the Retail Funds (since Steel Corporation. Frankel LLP April 1994) and the Institutional Counsel to the Independent Funds (since July 2003); formerly Trustees Vice Chairman of Kmart Corporation 919 Third Avenue (December 1998-October 2000), New York, NY 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 (71) Trustee Since Managing Director of Summit 208 Director of Franklin c/o Summit Ventures LLC January 1993 Ventures LLC; Director or Trustee Covey (time 1 Utah Center of the Retail Funds (since January management systems), 201 S. Main Street 1993) and the Institutional Funds BMW Bank of North Salt Lake City, UT (since July 2003); member of the America, Inc. Utah Regional Advisory Board of (industrial loan Pacific Corp.; formerly United corporation), United States Senator (R-Utah) (1974-1992) Space Alliance and Chairman, Senate Banking (joint venture Committee (1980-1986), Mayor of between Lockheed Salt Lake City, Utah (1971-1974), Martin and the Astronaut, Space Shuttle Discovery Boeing Company) and (April 12-19, 1985), and Vice Nuskin Asia Pacific Chairman, Huntsman Corporation (multilevel (chemical company). marketing); member of the board of various civic and charitable organizations. Wayne E. Hedien (70) Trustee Since Retired; Director or Trustee of the 208 Director of The PMI c/o Kramer Levin Naftalis & September Retail Funds (since September 1997) Group Inc. (private Frankel LLP 1997 and the Institutional Funds (since mortgage insurance); Counsel to the Independent July 2003); formerly associated Trustee and Vice Trustees with the Allstate Companies Chairman of The 919 Third Avenue (1966-1994), most recently as Field Museum of New York, NY Chairman of The Allstate Natural History; Corporation (March 1993-December director of various 1994) and Chairman and Chief other business and Executive Officer of its charitable wholly-owned subsidiary, Allstate organizations. Insurance Company (July 1989- December 1994). </Table> 15 <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 PAST OVERSEEN OTHER DIRECTORSHIPS INDEPENDENT TRUSTEE REGISTRANT TIME SERVED* 5 YEARS** BY TRUSTEE*** HELD BY TRUSTEE - --------------------------- ----------- ------------ ----------------------------------- ------------- -------------------- Dr. Manuel H. Johnson (55) Trustee Since Senior Partner, Johnson Smick 208 Director of NVR, c/o Johnson Smick July 1991 International, Inc., a consulting Inc. (home International, Inc. firm; Chairman of the Audit construction); 2099 Pennsylvania Avenue, Committee and Director or Trustee Chairman and Trustee N.W. of the Retail Funds (since of the Financial Suite 950 July 1991) and the Institutional Accounting Washington, D.C. Funds (since July 2003); Co-Chairman Foundation and a founder of the Group of Seven (oversight Council (G7C), an international organization of the economic commission; formerly Vice Financial Accounting Chairman of the Board of Governors Standards Board); of the Federal Reserve System and Director of RBS Assistant Secretary of the U.S. Greenwich Capital Treasury. Holdings (financial holding company). Joseph J. Kearns (61) Trustee Since President, Kearns & Associates LLC 209 Director of Electro PMB754 July 2003 (investment consulting); Deputy Rent Corporation 23852 Pacific Coast Highway Chairman of the Audit Committee and (equipment leasing), Malibu, CA Director or Trustee of the Retail The Ford Family Funds (since July 2003) and the Foundation, and the Institutional Funds (since UCLA Foundation. 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 (68) Trustee Since General Partner of Triumph Capital, 208 Director of various c/o Triumph Capital, L.P. July 1991 L.P., a private investment business 445 Park Avenue partnership; Chairman of the organizations. New York, NY 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 (71) Trustee Since Chairman of Lumelite Plastics 209 Trustee and Director c/o Lumelite Plastics July 2003 Corporation; Chairman of the of certain Corporation Governance Committee and Director investment companies 85 Charles Colman Blvd. or Trustee of the Retail Funds in the JPMorgan Funds Pawling, NY (since July 2003) and the complex managed by Institutional Funds (since J.P. Morgan June 1992). Investment Management Inc. </Table> 16 <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 PAST OVERSEEN OTHER DIRECTORSHIPS INTERESTED TRUSTEE REGISTRANT TIME SERVED* 5 YEARS** BY TRUSTEE*** HELD BY TRUSTEE - --------------------------- ----------- ------------ ----------------------------------- ------------- -------------------- Charles A. Fiumefreddo (71) Chairman of Since Chairman and Director or Trustee of 208 None c/o Morgan Stanley Trust the Board July 1991 the Retail Funds (since July 1991) Harborside Financial and Trustee and the Institutional Funds (since Center, July 2003); formerly Chief Plaza Two, Executive Officer of the Retail Jersey City, NJ Funds (until September 2002). James F. Higgins (56) Trustee Since Director or Trustee of the Retail 208 Director of AXA c/o Morgan Stanley Trust June 2000 Funds (since June 2000) and the Financial, Inc. and Harborside Financial Institutional Funds (since The Equitable Life Center, July 2003); Senior Advisor of Morgan Assurance Society of Plaza Two, Stanley (since August 2000); the United States Jersey City, NJ Director of the Distributor and (financial Dean Witter Realty Inc.; previously services). President and Chief Operating Officer of the Private Client Group of Morgan Stanley (May 1999-August 2000), and President and Chief Operating Officer of Individual Securities of Morgan Stanley (February 1997-May 1999). </Table> - ---------- * THIS IS THE EARLIEST DATE THE TRUSTEE BEGAN SERVING THE FUNDS ADVISED BY MORGAN STANLEY INVESTMENT ADVISORS INC. (THE "INVESTMENT MANAGER ") (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 MANAGER AND ANY FUNDS THAT HAVE AN INVESTMENT ADVISOR THAT IS AN AFFILIATED PERSON OF THE INVESTMENT MANAGER (INCLUDING BUT NOT LIMITED TO MORGAN STANLEY INVESTMENT MANAGEMENT INC.). 17 <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** - --------------------------- ----------- -------------- -------------------------------------------------------- Mitchell M. Merin (50) President Since May 1999 President and Chief Operating Officer of Morgan Stanley 1221 Avenue of the Americas Investment Management Inc.; President, Director and New York, NY Chief Executive Officer of the Investment Manager and Morgan Stanley Services; Chairman and Director of the Distributor; Chairman and Director of the Transfer Agent; Director of various Morgan Stanley subsidiaries; President of the Institutional Funds (since July 2003) and President of the Retail Funds (since May 1999); Trustee (since July 2003) and President (since December 2002) of the Van Kampen Closed-End Funds; Trustee (since May 1999) and President (since October 2002) of the Van Kampen Open-End Funds. Barry Fink (49) Vice Since General Counsel (since May 2000) and Managing Director 1221 Avenue of the Americas President February 1997 (since December 2000) of Morgan Stanley Investment New York, NY Management; Managing Director (since December 2000), Secretary (since February 1997) and Director (since July 1998) of the Investment Manager and Morgan Stanley Services; Vice President of the Retail Funds; Assistant Secretary of Morgan Stanley DW; Vice President of the Institutional Funds (since July 2003); Managing Director, Secretary and Director of the Distributor; previously Secretary (February 1997-July 2003) and General Counsel (February 1997-April 2004) of the Retail Funds; Vice President and Assistant General Counsel of the Investment Manager and Morgan Stanley Services (February 1997-December 2001). Ronald E. Robison (65) Executive Since Principal Executive Officer-Office of the Funds (since 1221 Avenue of the Americas Vice April 2003 November 2003); Managing Director of Morgan Stanley & Co. New York, NY President Incorporated, Managing Director of Morgan Stanley; and Managing Director, Chief Administrative Officer and Principal Director of the Investment Manager and Morgan Stanley Executive Services; Chief Executive Officer and Director of the Officer Transfer Agent; Managing Director and Director of the Distributor; Executive Vice President and Principal Executive Officer of the Institutional Funds (since July 2003) and the Retail Funds (since April 2003); Director of Morgan Stanley SICAV (since May 2004); previously President and Director of the Institutional Funds (March 2001-July 2003) and Chief Global Operations Officer and Managing Director of Morgan Stanley Investment Management Inc. Joseph J. McAlinden (61) Vice Since Managing Director and Chief Investment Officer of the 1221 Avenue of the Americas President July 1995 Investment Manager and Morgan Stanley Investment New York, NY Management Inc., Director of the Transfer Agent, Chief Investment Officer of the Van Kampen Funds; Vice President of the Institutional Funds (since July 2003) and the Retail Funds (since July 1995). Stefanie V. Chang (37) Vice Since Executive Director of Morgan Stanley & Co. Incorporated, 1221 Avenue of the Americas President July 2003 Morgan Stanley Investment Management Inc., and the New York, NY Investment Manager; Vice President of the Institutional Funds (since December 1997) and the Retail Funds (since July 2003); formerly practiced law with the New York law firm of Rogers & Wells (now Clifford Chance US LLP). </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** - --------------------------- ----------- --------------- ------------------------------------------------------ Francis J. Smith (38) Treasurer Treasurer since Executive Director of the Investment Manager and c/o Morgan Stanley Trust and Chief July 2003 and Morgan Stanley Services (since December 2001); Harborside Financial Financial Chief Financial previously Vice President of the Retail Funds Center, Officer Officer since (September 2002-July 2003), and Vice President of the Plaza Two, September 2002 Investment Manager and Morgan Stanley Services (August Jersey City, NJ 2000-November 2001) and Senior Manager at PricewaterhouseCoopers LLP (January 1998-August 2000). Thomas F. Caloia (58) Vice Since Executive Director (since December 2002) and Assistant c/o Morgan Stanley Trust President July 2003 Treasurer of the Investment Manager, the Distributor Harborside Financial and Morgan Stanley Services; previously Treasurer of Center, the Retail Funds (April 1989-July 2003); formerly Plaza Two, First Vice President of the Investment Manager, the Jersey City, NJ Distributor and Morgan Stanley Services. Mary E. Mullin (37) Secretary Since Executive Director of Morgan Stanley & Co. 1221 Avenue of the Americas July 2003 Incorporated, Morgan Stanley Investment Management New York, NY Inc. and the Investment Manager; Secretary of the Institutional Funds (since June 1999) and the Retail Funds (since July 2003); formerly practiced law with the New York law firms of McDermott, Will & Emery and Skadden, Arps, Slate, Meagher & Flom LLP. </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. 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 Mitchell M. Merin PRESIDENT Ronald E. Robison EXECUTIVE VICE PRESIDENT AND PRINCIPAL EXECUTIVE OFFICER Barry Fink VICE PRESIDENT Joseph McAlinden VICE PRESIDENT Stephanie V. Chang VICE PRESIDENT Francis J. Smith TREASURER AND CHIEF FINANCIAL OFFICER Thomas F. Caloia VICE PRESIDENT Mary E. Mullen 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 MANAGER 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. (C) 2004 Morgan Stanley [MORGAN STANLEY LOGO] [GRAPHIC] MORGAN STANLEY FUNDS ACTIVE ASSETS INSTITUTIONAL MONEY TRUST ANNUAL REPORT JUNE 30, 2004 [MORGAN STANLEY LOGO] RA04-00475P-Y06/04 <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) Not applicable. (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> Item 4. Principal Accountant Fees and Services. (a)(b)(c)(d) and (g). Based on fees billed for the periods shown: 2004 <Table> <Caption> REGISTRANT COVERED ENTITIES(1) AUDIT FEES $ 25,647 N/A NON-AUDIT FEES AUDIT-RELATED FEES $ 452 (2) $ 3,225,276 (2) TAX FEES $ 5,304 (3) $ 610,053 (4) ALL OTHER FEES $ - $ - TOTAL NON-AUDIT FEES $ 5,756 $ 3,835,329 TOTAL $ 31,403 $ 3,835,329 </Table> 2003 <Table> <Caption> REGISTRANT COVERED ENTITIES(1) AUDIT FEES $ 24,199 N/A NON-AUDIT FEES AUDIT-RELATED FEES $ 684 (2) $ 739,996 (2) TAX FEES $ 4,607 (3) $ 187,500 (4) ALL OTHER FEES $ - $ - (5) TOTAL NON-AUDIT FEES $ 5,291 $ 927,496 TOTAL $ 29,490 $ 927,496 </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: AUDIT COMMITTEE AUDIT AND NON-AUDIT SERVICES PRE-APPROVAL POLICY AND PROCEDURES OF THE MORGAN STANLEY RETAIL AND INSTITUTIONAL FUNDS AS ADOPTED JULY 31, 2003(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, supercedes 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 <Page> 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 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. <Page> 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 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. <Page> 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 Morgan Stanley Investments LP Van Kampen Asset Management Inc. Morgan Stanley Services Company, Inc. Morgan Stanley Distributors Inc. Morgan Stanley Trust FSB MORGAN STANLEY INSTITUTIONAL FUNDS Morgan Stanley Investment Management Inc. Morgan Stanley Investments LP 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 <Page> Covered Entities is compatible with maintaining the auditors' independence in performing audit services. Item 5. Audit Committee of Listed Registrants. Applicable only for reports covering periods ending on or after the earlier of (i) the first annual shareholder meeting after January 15, 2004 or (ii) October 31, 2004. Item 6. [Reserved.] Item 7. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies. Applicable only to annual reports filed by closed-end funds. Item 8. [Reserved.] Item 9 - 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. There were no significant changes or corrective actions with regard to significant deficiencies or material weaknesses in the Fund's internal controls or in other factors that could significantly affect the Fund's internal controls subsequent to the date of their evaluation. (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 10 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. Active Assets Institutional Money Trust /s/ Ronald E. Robison Ronald E. Robison Principal Executive Officer August 19, 2004 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 August 19, 2004 /s/ Francis Smith Francis Smith Principal Financial Officer August 19, 2004