MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
N-2, 1998-11-20
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<PAGE>
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 20, 1998
    
   
                                               SECURITIES ACT FILE NO. 333-
                                        INVESTMENT COMPANY ACT FILE NO. 811-5898
    
- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
                               ------------------
                                    FORM N-2
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933                     /X/
                         PRE-EFFECTIVE AMENDMENT NO.                         / /
   
                        POST-EFFECTIVE AMENDMENT NO.                         / /
    
                                     AND/OR
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940                                /X/
   
                                AMENDMENT NO. 13                             /X/
    
                             ----------------------
   
                 MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
                         (FORMERLY PRIME INCOME TRUST)
                        (A MASSACHUSETTS BUSINESS TRUST)
    
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
 
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (212) 392-1600
                                BARRY FINK, ESQ.
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)
                                    COPY TO:
                            DAVID M. BUTOWSKY, ESQ.
                             GORDON ALTMAN BUTOWSKY
                             WEITZEN SHALOV & WEIN
                              114 WEST 47TH STREET
                            NEW YORK, NEW YORK 10036
                             ----------------------
   APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING: As soon as practicable after
                the effective date of the registration statement
                             ----------------------
   
    If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. /X/
    
                              -------------------
   
        CALCULATION OF REGISTRATION FEE UNDER THE SECURITIES ACT OF 1933
    
 
   
<TABLE>
<CAPTION>
                                                                            PROPOSED
                                                                            MAXIMUM
                                        AMOUNT            MAXIMUM          AGGREGATE         AMOUNT OF
       TITLE OF SECURITIES               BEING         OFFERING PRICE       OFFERING        REGISTRATION
        BEING REGISTERED             REGISTERED(1)      PER UNIT(2)         PRICE(2)            FEE
<S>                                <C>                <C>               <C>               <C>
Shares of Beneficial Interest,        350,000,000
  $.01 par value.................       Shares             $9.91         $3,468,500,000       $964,243
</TABLE>
    
 
   
(1) 350,000,000 shares were registered under previous Registration Statements
    (File Nos. 33-30657, 33-37819, 33-61341 and 333-18953).
    
 
   
(2) Estimated solely for the purpose of calculating the registration fee.
    
                             ----------------------
 
   
    The Registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the registrant shall
file a future amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until the registration statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.
    
                             ----------------------
 
   
    Pursuant to Rule 429 under the Securities Act of 1933, the Prospectus
contained in this Registration Statement is a combined Prospectus and relates to
Registration Statement No. 333-18953 previously filed by the Registrant on Form
N-2 and declared effective on January 23, 1997.
    
 
- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
<PAGE>
   
                 MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
 
                                    FORM N-2
 
                             CROSS REFERENCE SHEET
 
<TABLE>
<CAPTION>
PART I ITEM NUMBER                                                                 PROSPECTUS CAPTION
- - ----------------------------------------------------------------  -----------------------------------------------------
<C>        <S>                                                    <C>
       1.  Cover Page...........................................  Cover Page
       2.  Synopsis.............................................  Prospectus Summary
       3.  Condensed Financial Information......................  Financial Highlights; Financial Statements
       4.  Plan of Distribution.................................  Cover Page; Prospectus Summary; Initial Underwriting
                                                                   and Continuous Offering
       5.  Use of Proceeds......................................  Use of Proceeds; Investment Objective and Policies
       6.  General Information and History......................  The Trust and its Adviser; Description of Shares
       7.  Investment Objectives and Policies...................  Investment Objective and Policies; Investment
                                                                   Practices; Investment Restrictions; Appendix A
       8.  Tax Status...........................................  Taxation
       9.  Brokerage Allocation and Other Practices.............  Portfolio Transactions
      10.  Pending Legal Proceedings............................  Not Applicable
      11.  Control Persons and Principal Holders of
            Securities..........................................  Description of Shares
      12.  Directors, Officers and Advisory Board Members.......  Trustees and Officers
      13.  Remuneration of Directors and Officers...............  Trustees and Officers
      14.  Custodian, Transfer Agent and Dividend
            Paying Agent........................................  Custodian, Dividend Disbursing and Transfer Agent
      15.  Investment Advisory and Other Services...............  The Trust and its Adviser; Investment Advisory
                                                                   Agreement; Administrator and Administration
                                                                   Agreement
      16.  Defaults and Arrears on Senior Securities............  Not Applicable
      17.  Capital Stock........................................  Description of Shares
      18.  Long-Term Debt.......................................  Not Applicable
      19.  Other Securities.....................................  Not Applicable
      20.  Financial Statements.................................  Report of Independent Accountants; Financial
                                                                   Statements
</TABLE>
<PAGE>
PROSPECTUS
 
                           MORGAN STANLEY DEAN WITTER
                               PRIME INCOME TRUST
                                  -----------
 
   
    MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST (THE "TRUST") IS AN INVESTMENT
COMPANY WHICH SEEKS TO PROVIDE A HIGH LEVEL OF CURRENT INCOME CONSISTENT WITH
THE PRESERVATION OF CAPITAL. THE TRUST SEEKS TO ACHIEVE ITS OBJECTIVE THROUGH
INVESTMENT PRIMARILY IN SENIOR LOANS. SENIOR LOANS ARE LOANS MADE TO
CORPORATIONS, PARTNERSHIPS AND OTHER ENTITIES, THAT HOLD THE MOST SENIOR
POSITIONS IN A BORROWER'S CAPITAL STRUCTURE. THE SENIOR LOANS IN WHICH THE TRUST
INVESTS ARE SECURED BY COLLATERAL THAT THE INVESTMENT ADVISOR BELIEVES TO HAVE A
MARKET VALUE AT THE TIME OF THE LOAN THAT EQUALS OR EXCEEDS THE AMOUNT OF THE
SENIOR LOAN.
    
                              --------------------
 
   
    THE INTEREST RATE ON SENIOR LOANS GENERALLY WILL FLOAT OR RESET AT A
SPECIFIED LEVEL ABOVE A GENERALLY RECOGNIZED BASE LENDING RATE SUCH AS THE PRIME
RATE OR LIBOR. THE INVESTMENT ADVISOR BELIEVES THAT OVER TIME, THE EFFECTIVE
YIELD OF THE TRUST WILL EXCEED MONEY MARKET RATES AND WILL TRACK THE MOVEMENT OF
THE PUBLISHED PRIME RATE OF MAJOR U.S. BANKS.
    
                              --------------------
 
   
    SHARES OF THE TRUST ARE CONTINUOUSLY OFFERED AT A PRICE EQUAL TO THE THEN
CURRENT NET ASSET VALUE PER SHARE WITHOUT AN INITIAL SALES CHARGE.
    
                              --------------------
 
   
    SHARES ARE NOT REDEEMABLE AND THERE IS NO SECONDARY MARKET FOR THE SHARES.
THE BOARD OF TRUSTEES CURRENTLY INTENDS TO CONSIDER THE MAKING OF TENDER OFFERS
ON A QUARTERLY BASIS TO REPURCHASE ALL OR A PORTION OF THE SHARES FROM
SHAREHOLDERS AT THE THEN CURRENT NET ASSET VALUE PER SHARE. SHARES TENDERED THAT
WERE HELD FOR LESS THAN FOUR YEARS ARE GENERALLY SUBJECT TO AN EARLY WITHDRAWAL
CHARGE OF UP TO 3% OF THE ORIGINAL PURCHASE PRICE.
    
                              --------------------
 
   
    INVESTMENT IN THE TRUST INVOLVES A VARIETY OF RISKS WHICH YOU SHOULD
CONSIDER PRIOR TO INVESTMENT. SEE "RISK FACTORS".
    
                              --------------------
 
   
    MORGAN STANLEY DEAN WITTER ADVISORS INC. IS THE INVESTMENT ADVISOR TO THE
TRUST. THE ADDRESS OF THE TRUST IS TWO WORLD TRADE CENTER, NEW YORK, NY 10048.
THE TRUST'S TELEPHONE NUMBER IS (212) 392-2550 OR (800) 869-NEWS. YOU SHOULD
READ THIS PROSPECTUS CAREFULLY BEFORE INVESTING.
    
                              --------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
   SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
    PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
                 REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                              --------------------
 
   
<TABLE>
<CAPTION>
- - --------------------------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------------------------
                                PRICE TO                                         PROCEEDS TO
                               PUBLIC (1)             SALES LOAD (1)            THE TRUST (2)
- - --------------------------------------------------------------------------------------------------
<S>                      <C>                      <C>                      <C>
PER SHARE                         $9.91                    NONE                     $9.91
TOTAL (3)                    $4,130,268,275                NONE                $4,130,268,275
- - --------------------------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------------------------
</TABLE>
    
 
   
                                           (SEE FOOTNOTES ON INSIDE FRONT COVER)
    
                              --------------------
 
                  MORGAN STANLEY DEAN WITTER DISTRIBUTORS INC.
 
   
DECEMBER   , 1998
    
<PAGE>
   
(FOOTNOTES TO TABLE ON FRONT COVER)
    
 
   
(1) THE SHARES ARE OFFERED ON A BEST EFFORTS BASIS AT A PRICE EQUAL TO THE NET
    ASSET VALUE PER SHARE WHICH AS OF THE DATE OF THE PROSPECTUS IS          .
    
 
   
(2) BEFORE DEDUCTION OF REGISTRATION FEES PAYABLE BY THE TRUST IN THE AMOUNT OF
    $964,243, WHICH WILL BE AMORTIZED DURING THE PERIOD IN WHICH THE SHARES ARE
    SUBSCRIBED AND CHARGED AS AN EXPENSE AGAINST THE INCOME OF THE TRUST.
    
 
   
(3) ASSUMING ALL SHARES CURRENTLY REGISTERED (INCLUDING 66,777,828 PREVIOUSLY
    REGISTERED BUT UNSOLD SHARES) ARE SOLD PURSUANT TO THIS CONTINUOUS OFFERING
    AT A PRICE OF $9.91 PER SHARE. THE TRUST COMMENCED OPERATIONS ON NOVEMBER
    30, 1989, FOLLOWING COMPLETION OF A FIRM COMMITMENT UNDERWRITING FOR
    10,921,751 SHARES, WITH NET PROCEEDS TO THE TRUST OF $109,217,510. THE TRUST
    COMMENCED THE CONTINUOUS OFFERING OF ITS SHARES ON DECEMBER 4, 1989.
    
 
    NO DEALER, SALESMAN OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS AND,
IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY THE TRUST OR THE PRINCIPAL UNDERWRITER. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO
BUY ANY OF THE SECURITIES OFFERED HEREBY IN ANY JURISDICTION TO ANY PERSON TO
WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER IN SUCH JURISDICTION.
                            ------------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
Summary of Trust Expenses...............................................      3
Financial Highlights....................................................      4
Prospectus Summary......................................................      5
The Trust and its Advisor...............................................      8
Investment Objective and Policies.......................................     11
Risk Factors............................................................     16
Investment Practices....................................................     19
Investment Restrictions.................................................     22
Trustees and Officers...................................................     24
Investment Advisory Agreement...........................................     32
Administrator and Administration Agreement..............................     33
Portfolio Transactions..................................................     35
Determination of Net Asset Value........................................     36
Dividends and Distributions.............................................     37
Taxation................................................................     37
Description of Shares...................................................     40
Share Repurchases and Tenders...........................................     42
Purchase of Shares......................................................     44
Yield Information.......................................................     45
Custodian, Dividend Disbursing and Transfer Agent.......................     45
Reports to Shareholders.................................................     46
Legal Counsel...........................................................     46
Experts.................................................................     46
Additional Information..................................................     46
Report of Independent Accountants.......................................     47
Financial Statements--September 30, 1998................................     48
Appendix A..............................................................     70
</TABLE>
    
 
                            ------------------------
 
                                       2
<PAGE>
SUMMARY OF TRUST EXPENSES
- - --------------------------------------------------------------------------------
 
   
    The expenses and fees set forth in the table are for the fiscal year ended
September 30, 1998.
    
 
   
<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES
- - ------------------------------------------------------------
<S>                                                           <C>
Sales Load Imposed on Purchases.............................        None
Sales Load Imposed on Reinvested Dividends..................        None
Early Withdrawal Charge.....................................        3.0%
An early withdrawal charge is imposed on tenders at the
 following declining rates:
                                                              EARLY WITHDRAWAL
  YEAR AFTER PURCHASE                                              CHARGE
- - ------------------------------------------------------------  ----------------
  First.....................................................        3.0%
  Second....................................................        2.5%
  Third.....................................................        2.0%
  Fourth....................................................        1.0%
  Fifth and thereafter......................................        None
ANNUAL EXPENSES (AS A PERCENTAGE OF NET ASSETS)
Investment Advisory Fees....................................       0.86%
Interest Payments on Borrowed Funds.........................        None
Sum of Other Expenses.......................................       0.43%
Total Annual Expenses.......................................       1.29%
</TABLE>
    
 
   
<TABLE>
<CAPTION>
EXAMPLE                                   1 YEAR   3 YEARS   5 YEARS   10 YEARS
- - ----------------------------------------  ------   -------   -------   --------
<S>                                       <C>      <C>       <C>       <C>
You would pay the following expenses on
 a $1,000 investment, assuming (1) 5%
 annual return and (2) tender at the end
 of each time period:...................   $43       $61       $71       $156
You would pay the following expenses on
 the same investment, assuming no
 tender:................................   $13       $41       $71       $156
</TABLE>
    
 
- - ------------------------
    THE ABOVE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR
FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE TRUST MAY BE GREATER OR
LESS THAN THOSE SHOWN.
 
    The purpose of this table is to assist the investor in understanding the
various costs and expenses that an investor in the Trust will bear directly or
indirectly. For a more complete description of these costs and expenses, see the
cover page of this Prospectus and "Investment Advisory Agreement,"
"Administrator and Administration Agreement" and "Share Repurchases and
Tenders--Early Withdrawal Charge" in this Prospectus.
 
                                       3
<PAGE>
FINANCIAL HIGHLIGHTS
- - --------------------------------------------------------------------------------
 
   
    The following ratios and per share data for a share of beneficial interest
outstanding throughout each period have been audited by PricewaterhouseCoopers
LLP, independent accountants. This data should be read in conjunction with the
financial statements, and notes thereto, and the unqualified report of
independent accountants which are contained in this Prospectus commencing on
page 47. As noted in the financial statements and in the report of
PricewaterhouseCoopers LLP, the Trust invests primarily in senior collateralized
loans which values have been determined in accordance with the procedures
adopted by the Trustees in the absence of readily ascertainable market values.
    
   
<TABLE>
<CAPTION>
                                                            FOR THE YEAR ENDED SEPTEMBER 30,
                               ------------------------------------------------------------------------------------------
                                  1998       1997       1996       1995        1994       1993        1992        1991
                               ----------  ---------  ---------  ---------  ----------  ---------  ----------  ----------
<S>                            <C>         <C>        <C>        <C>        <C>         <C>        <C>         <C>
PER SHARE OPERATING
 PERFORMANCE:
  Net asset value, beginning
   of period.................. $     9.95  $    9.94  $    9.99  $   10.00  $     9.91  $    9.99  $    10.00  $    10.00
                               ----------  ---------  ---------  ---------  ----------  ---------  ----------  ----------
  Net investment income.......       0.71       0.75       0.74       0.82        0.62       0.55        0.62        0.84
  Net realized and unrealized
   gain (loss)................      (0.03)        --      (0.04)      0.01        0.09      (0.08)      (0.01)         --
                               ----------  ---------  ---------  ---------  ----------  ---------  ----------  ----------
  Total from investment
   operations.................       0.68       0.75       0.70       0.83        0.71       0.47        0.61        0.84
                               ----------  ---------  ---------  ---------  ----------  ---------  ----------  ----------
  Less dividends and
   distributions from:
    Net investment income.....      (0.72)     (0.74)     (0.75)     (0.81)      (0.62)     (0.55)      (0.62)      (0.84)
    Net realized gain.........         --         --         --      (0.03)         --         --          --          --
                               ----------  ---------  ---------  ---------  ----------  ---------  ----------  ----------
  Total dividends and
   distributions..............      (0.72)     (0.74)     (0.75)     (0.84)      (0.62)     (0.55)      (0.62)      (0.84)
                               ----------  ---------  ---------  ---------  ----------  ---------  ----------  ----------
  Net asset value, end of
   period..................... $     9.91  $    9.95  $    9.94  $    9.99  $    10.00  $    9.91  $     9.99  $    10.00
                               ----------  ---------  ---------  ---------  ----------  ---------  ----------  ----------
                               ----------  ---------  ---------  ---------  ----------  ---------  ----------  ----------
TOTAL INVESTMENT RETURN+......      7.14%      7.78%      7.25%      8.57%       7.32%      4.85%       6.23%       8.77%
 
RATIOS TO AVERAGE NET ASSETS:
  Expenses....................      1.29%      1.40%      1.46%      1.52%       1.60%      1.45%       1.47%       1.52%
  Net investment income.......      7.17%      7.53%      7.50%      8.11%       6.14%      5.53%       6.14%       8.23%
 
SUPPLEMENTAL DATA:
  Net assets, end of period,
   in thousands............... $1,996,709  $1,344,603  $939,471   $521,361    $305,034   $311,479    $413,497    $479,941
  Portfolio turnover rate.....        68%        86%        72%       102%        147%        92%         46%         42%
 
<CAPTION>
                                 FOR THE
                                  PERIOD
                                 NOVEMBER
                                30, 1989*
                                 THROUGH
                                SEPTEMBER
                                   30,
                                   1990
                                ----------
<S>                            <C>
PER SHARE OPERATING
 PERFORMANCE:
  Net asset value, beginning
   of period..................  $   10.00
                                ----------
  Net investment income.......       0.74
  Net realized and unrealized
   gain (loss)................      (0.01)
                                ----------
  Total from investment
   operations.................       0.73
                                ----------
  Less dividends and
   distributions from:
    Net investment income.....      (0.73)
    Net realized gain.........         --
                                ----------
  Total dividends and
   distributions..............      (0.73)
                                ----------
  Net asset value, end of
   period.....................  $   10.00
                                ----------
                                ----------
TOTAL INVESTMENT RETURN+......      7.57%(1)
RATIOS TO AVERAGE NET ASSETS:
  Expenses....................      1.48%(2)
  Net investment income.......      8.95%(2)
SUPPLEMENTAL DATA:
  Net assets, end of period,
   in thousands...............   $328,189
  Portfolio turnover rate.....        35%(1)
</TABLE>
    
 
- - ---------------------
 
   
 *  COMMENCEMENT OF OPERATIONS.
    
 
   
 +  DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
    ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
    
 
   
    DIVIDENDS AND DISTRIBUTIONS ARE ASSUMED TO BE REINVESTED AT THE PRICES
    OBTAINED UNDER THE TRUST'S DIVIDEND REINVESTMENT PLAN.
    
 
   
(1) NOT ANNUALIZED.
    
 
   
(2) ANNUALIZED.
    
 
                                       4
<PAGE>
   
                               PROSPECTUS SUMMARY
    
   
    KEY INFORMATION ABOUT THE TRUST IS SUMMARIZED BELOW. YOU SHOULD READ IT IN
LIGHT OF THE MORE DETAILED INFORMATION SET FORTH LATER IN THIS PROSPECTUS.
    
 
   
<TABLE>
<S>                         <C>
PURCHASE OF SHARES........  Shares of the Trust are continuously offered for sale at the
                            then net asset value per share without an initial sales charge.
                            The minimum initial investment in the Trust is $1,000.
                            Subsequent investments must be at least $100. Shares may be
                            purchased through Dean Witter Reynolds Inc. and other selected
                            broker-dealers.
INVESTMENT OBJECTIVE AND
POLICIES..................  The investment objective of the Trust is to provide a high level
                            of current income consistent with the preservation of capital.
                            The Trust seeks to achieve its objective through investment
                            primarily in Senior Loans. There is no assurance that the Trust
                            will achieve this objective.
                            Senior Loans are loans made to corporations, partnerships and
                            other entities which hold the most senior position in a
                            borrower's capital structure. The Senior Loans in which the
                            Trust invests are secured by collateral that the Investment
                            Advisor believes to have a market value at the time of the loan
                            which equals or exceeds the amount of the Senior Loan. The
                            interest rate on Senior Loans generally will float or reset at a
                            specified level above a generally recognized base lending rate
                            such as the prime rate quoted by a major U.S. bank ("Prime
                            Rate") or the London Inter-Bank Offered Rate ("LIBOR").
                            The Trust invests, under normal market conditions, at least 80%
                            of its total assets in Senior Loans. The remainder of its assets
                            are invested in cash or short-term high quality money market
                            instruments. Senior Loans in which the Trust may invest
                            typically are originated, negotiated and structured by a
                            syndicate of lenders ("Lenders") and administered on behalf of
                            the Lenders by an agent bank ("Agent"). The terms of the loan
                            are set forth in a loan agreement (the "Loan Agreement"). The
                            Trust may acquire such syndicated Senior Loans ("Syndicated
                            Loans") in one of three ways: (i) it may act as a Lender; (ii)
                            it may acquire an Assignment; or (iii) it may acquire a
                            Participation. Senior Loans may also take the form of debt
                            obligations of Borrowers issued directly to investors in the
                            form of debt securities ("Senior Notes").
                            An Assignment is a sale by a Lender or other third party of its
                            rights in a Senior Loan. Generally, when the Trust purchases an
                            Assignment, it obtains all of the rights of a Lender. In some
                            cases, however, the Assignment may be of a more limited nature
                            and the Trust may have no contractual relationship with the
                            Borrower. In such instances, the Trust would be required to rely
                            on the Lender or other third party from which it acquired the
                            Assignment to demand payment and enforce its rights under the
                            Senior Loan.
                            A Participation is an interest in a Senior Loan acquired from a
                            Lender or other third party (the "Selling Participant"). Payment
                            of principal and interest received by the Selling Participant
                            are passed through to the
</TABLE>
    
 
                                       5
<PAGE>
   
<TABLE>
<S>                         <C>
                            holder of the Participation. When the Trust acquires a
                            Participation it will have a contractual relationship with the
                            Selling Participant but not the Borrower. As a result, the Trust
                            assumes the credit risk of the Borrower, the Selling Participant
                            and any other prior Selling Participant.
INVESTMENT ADVISOR........  Morgan Stanley Dean Witter Advisors Inc. ("MSDW Advisors" or the
                            "Investment Advisor") is the Trust's Investment Advisor. The
                            Investment Advisor is a wholly-owned subsidiary of Morgan
                            Stanley Dean Witter & Co., a preeminent global financial
                            services firm that maintains leading market positions in each of
                            its three primary businesses -- securities, asset management and
                            credit services.
                            The Investment Advisor and its wholly-owned subsidiary, Morgan
                            Stanley Dean Witter Services Company Inc., serve in various
                            investment management, advisory, management, and administrative
                            capacities to 101 investment companies, 28 of which are listed
                            on the New York Stock Exchange, with combined assets of
                            approximately $112.9 billion as of October 31, 1998. The
                            Investment Advisor also manages and advises portfolios of
                            pension plans, other institutions and individuals which
                            aggregated approximately $4.5 billion at such date.
ADVISORY FEE..............  The Trust pays the Investment Advisor an advisory fee calculated
                            at an annual rate of 0.90% of average daily net assets on assets
                            of the Trust up to $500 million, at an annual rate of 0.85% of
                            average daily net assets on assets of the Trust exceeding $500
                            million up to $1.5 billion and at an annual rate of 0.825% of
                            the average daily net assets of the Trust exceeding $1.5
                            billion.
ADMINISTRATOR.............  Morgan Stanley Dean Witter Services Company Inc. ("MSDW
                            Services" or the "Administrator"), a wholly-owned subsidiary of
                            MSDW Advisors, the Investment Advisor of the Trust, is the
                            Administrator of the Trust. See "Administrator and
                            Administration Agreement" and "Purchase of Shares."
ADMINISTRATION FEE........  The Trust pays the Administrator a monthly fee at an annual rate
                            of 0.25% of the Trust's daily net assets. See "Administrator and
                            Administration Agreement."
DIVIDENDS AND
DISTRIBUTIONS.............  Income dividends are declared daily and paid monthly. Dividends
                            and distributions to holders of Shares cannot be assured, and
                            the amount of each monthly payment may vary. Capital gains, if
                            any, will be distributed at least annually. All dividends and
                            capital gains distributions will be reinvested automatically in
                            additional Shares, unless you elect to receive cash
                            distributions. See "Dividends and Distributions" and "Taxation."
SHARE REPURCHASES AND
TENDERS...................  The Board of Trustees of the Trust currently intends, each
                            quarter, to consider authorizing the Trust to make tender offers
                            for all or a portion of its outstanding Shares at the then
                            current net asset value of the Shares. An early withdrawal
                            charge payable to the Investment Advisor of up to 3.0% of the
                            original purchase price of such Shares will be imposed on
</TABLE>
    
 
                                       6
<PAGE>
   
<TABLE>
<S>                         <C>
                            most Shares accepted for tender that have been held for four
                            years or less. There is no guarantee that the Trust will in fact
                            make a tender offer for any of its Shares or that if a tender
                            offer is made, all or any Shares tendered will be purchased by
                            the Trust. If a tender offer is not made or Shares are not
                            purchased pursuant to a tender offer you may not be able to sell
                            your Shares. The Trust may borrow to finance tender offers.
CUSTODIAN.................  The Bank of New York serves as Custodian of the Trust's assets.
                            See "Custodian, Dividend Disbursing and Transfer Agent."
RISK FACTORS..............  An investment in the Trust involves a number of risks. The
                            Borrower, under a Senior Loan, may fail to make scheduled
                            payments of principal and interest, which could result in a
                            decline in net asset value and a reduction of the Trust's yield.
                            While each Senior Loan will be collateralized, there is no
                            guarantee that the collateral securing a Senior Loan will be
                            sufficient to protect the Trust against losses or a decline in
                            income in the event of a Borrower's non-payment of principal
                            and/or interest. The Trust may invest in Senior Loans made in
                            connection with leveraged buyout transactions,
                            recapitalizations, and other highly leveraged transactions.
                            These types of Senior Loans are subject to greater risks than
                            are other Senior Loans in which the Trust may invest. Senior
                            Loans are not traded on an exchange nor is there any regular
                            secondary market. Due to the illiquidity of Senior Loans, the
                            Trust may not be able to dispose of its investment in Senior
                            Loans in a timely fashion and at a fair price. The Trust may
                            invest in Senior Loans made to non U.S. borrowers, provided the
                            Senior Loans are U.S. dollar-denominated. Loans to non-U.S.
                            borrowers, involve a variety of risks not present in the case of
                            Senior Loans to U.S. borrowers.
                            A substantial portion of the Senior Loans in which the Trust
                            invests may be rated by a national statistical rating
                            organization below investment grade.
                            An investment in the Shares should be considered illiquid. There
                            is no secondary market for the Shares and none is expected to
                            develop.
                            The above risks and others to which the Trust is subject, are
                            discussed in greater detail under the heading "Risk Factors."
ANTI-TAKEOVER PROVISIONS..  The Trust's Declaration of Trust includes anti-takeover
                            provisions. These include the requirement for a 66% shareholder
                            vote to remove Trustees and for certain mergers, issuances of
                            Shares and asset acquisitions. These provisions could have the
                            effect of limiting the ability of other persons or entities to
                            acquire control of the Trust and of depriving holders of Shares
                            of an opportunity to sell their Shares at a premium above
                            prevailing market prices by discouraging a third party from
                            seeking to obtain control of the Trust. See "Description of
                            Shares--Anti-Takeover Provisions."
</TABLE>
    
 
                                       7
<PAGE>
THE TRUST AND ITS ADVISOR
- - --------------------------------------------------------------------------------
 
    Morgan Stanley Dean Witter Prime Income Trust (the "Trust") (formerly named
Prime Income Trust) is a non-diversified, closed-end management investment
company whose investment objective is to provide a high level of current income
consistent with the preservation of capital. The Trust will seek to achieve its
objective through investment primarily in senior collateralized loans ("Senior
Loans") to corporations, partnerships and other entities ("Borrowers"). No
assurance can be given that the Trust will achieve its investment objective. The
Trust is designed primarily for long-term investment and not as a trading
vehicle.
 
   
    The Trust is a trust of a type commonly known as a "Massachusetts business
trust" and was organized under the laws of Massachusetts on August 17, 1989
under the name "Allstate Prime Income Trust." Effective March 1, 1993, the Trust
Agreement was amended to change the name of the Trust to "Prime Income Trust."
Such amendment was made upon the approval by the shareholders of an investment
advisory agreement with MSDW Advisors. On June 22, 1998, the Trustees of the
Trust adopted an Amendment to the Trust's Declaration of Trust changing its name
to "Morgan Stanley Dean Witter Prime Income Trust." The Trust commenced
operations on November 30, 1989, following completion of a firm commitment
initial underwriting for 10,921,751 Shares, with net proceeds to the Trust of
$109,217,510. The Trust commenced the continuous offering of its shares on
December 4, 1989. The Trust's principal office is located at Two World Trade
Center, New York, New York 10048 and its telephone number is (212) 392-2550 or
(800) 869-NEWS. The Trust is offering continuously its shares of beneficial
interest, $.01 par value (the "Shares"). See "Purchase of Shares."
    
 
    An investment in Shares offers several benefits. The Trust offers investors
the opportunity to receive a high level of current income by investing in a
professionally managed portfolio comprised primarily of Senior Loans, a type of
investment typically not available to individual investors. In managing such a
portfolio, the Investment Advisor provides the Trust and its shareholders with
professional credit analysis and portfolio diversification. The Trust also
relieves the investor of burdensome administrative details involved in managing
a portfolio of Senior Loans, even if they were available to individual
investors. Such benefits are at least partially offset by the expenses involved
in operating an investment company, which consist primarily of management and
administrative fees and operational costs. See "Investment Advisory Agreement"
and "Administrator and Administration Agreement."
 
   
    On February 21, 1997 the Trust's Trustees approved a new investment advisory
agreement (the "Advisory Agreement") with MSDW Advisors in connection with the
merger of Dean Witter, Discover & Co. with Morgan Stanley Group Inc. (the
"Merger"). The Trust's shareholders voted to approve the Advisory Agreement with
MSDW Advisors at a Special Meeting of Shareholders held on May 20, 1997. The
Advisory Agreement took effect on May 31, 1997 upon the consumation of the
Merger. MSDW Advisors is a wholly-owned subsidiary of Morgan Stanley Dean Witter
& Co. ("MSDW"). The Advisory Agreement is substantially identical to a prior
investment advisory agreement which was initially approved by the Trust's
Trustees on December 23, 1992 and by the Trust's shareholders on February 25,
1993, entered into with MSDW Advisors as a consequence of the withdrawal of
Allstate Investment Management Company from its investment company advisory
activities and its concomitant resignation as the Trust's Investment Advisor.
    
 
    MSDW Advisors and its wholly-owned subsidiary, Morgan Stanley Dean Witter
Services Company Inc., serve in various investment management, advisory,
management and administrative capacities to
 
                                       8
<PAGE>
   
101 investment companies, 28 of which are listed on the New York Stock Exchange,
with combined assets of approximately $112.9 billion at October 31, 1998. MSDW
Advisors also manages and advises portfolios of pension plans, other
institutions and individuals which aggregated approximately $4.5 billion at such
date.
    
 
   
    The Trust is managed within MSDW Advisors' Taxable Fixed-Income Group, which
manages 20 funds and fund portfolios with approximately $14.1 billion in assets
as of June 30, 1998. Rajesh K. Gupta, Senior Vice President of MSDW Advisors,
Sheila A. Finnerty, Vice President of MSDW Advisors, and Peter Gewirtz, an
Assistant Vice President of MSDW Advisors, have been the primary portfolio
managers primarily responsible for the management of the Trust's portfolio since
February, 1998.
    
 
   
    MSDW Advisors is the investment manager or investment advisor of the
following investment companies, which are collectively referred to as the
"Morgan Stanley Dean Witter Funds":
    
 
   
<TABLE>
<CAPTION>
OPEN-END FUNDS
 
<C>        <S>
        1  Active Assets California Tax-Free Trust
        2  Active Assets Government Securities Trust
        3  Active Assets Money Trust
        4  Active Assets Tax-Free Trust
        5  Morgan Stanley Dean Witter American Value Fund
        6  Morgan Stanley Dean Witter Balanced Growth Fund
        7  Morgan Stanley Dean Witter Balanced Income Fund
        8  Morgan Stanley Dean Witter California Tax-Free Daily Income Trust
        9  Morgan Stanley Dean Witter California Tax-Free Income Fund
       10  Morgan Stanley Dean Witter Capital Appreciation Fund
       11  Morgan Stanley Dean Witter Capital Growth Securities
       12  Morgan Stanley Dean Witter Competitive Edge Fund, "BEST IDEAS" Portfolio
       13  Morgan Stanley Dean Witter Convertible Securities Trust
       14  Morgan Stanley Dean Witter Developing Growth Securities Trust
       15  Morgan Stanley Dean Witter Diversified Income Trust
       16  Morgan Stanley Dean Witter Dividend Growth Securities Inc.
       17  Morgan Stanley Dean Witter Equity Fund
       18  Morgan Stanley Dean Witter European Growth Fund Inc.
       19  Morgan Stanley Dean Witter Federal Securities Trust
       20  Morgan Stanley Dean Witter Financial Services Trust
       21  Morgan Stanley Dean Witter Fund of Funds
       22  Morgan Stanley Dean Witter Global Dividend Growth Securities
       23  Morgan Stanley Dean Witter Global Short-Term Income Fund Inc.
       24  Morgan Stanley Dean Witter Global Utilities Fund
       25  Morgan Stanley Dean Witter Growth Fund
       26  Morgan Stanley Dean Witter Hawaii Municipal Trust
       27  Morgan Stanley Dean Witter Health Sciences Trust
       28  Morgan Stanley Dean Witter High Yield Securities Inc.
       29  Morgan Stanley Dean Witter Income Builder Fund
       30  Morgan Stanley Dean Witter Information Fund
</TABLE>
    
 
                                       9
<PAGE>
   
<TABLE>
<C>        <S>
       31  Morgan Stanley Dean Witter Intermediate Income Securities
       32  Morgan Stanley Dean Witter International SmallCap Fund
       33  Morgan Stanley Dean Witter Japan Fund
       34  Morgan Stanley Dean Witter Limited Term Municipal Trust
       35  Morgan Stanley Dean Witter Liquid Asset Fund Inc.
       36  Morgan Stanley Dean Witter Market Leader Trust
       37  Morgan Stanley Dean Witter Mid-Cap Dividend Growth Securities
       38  Morgan Stanley Dean Witter Mid-Cap Growth Fund
       39  Morgan Stanley Dean Witter Multi-State Municipal Series Trust
       40  Morgan Stanley Dean Witter Natural Resource Development Securities Inc.
       41  Morgan Stanley Dean Witter New York Municipal Money Market Trust
       42  Morgan Stanley Dean Witter New York Tax-Free Income Fund
       43  Morgan Stanley Dean Witter Pacific Growth Fund Inc.
       44  Morgan Stanley Dean Witter Precious Metals and Minerals Trust
       45  Morgan Stanley Dean Witter Select Dimensions Investment Series
       46  Morgan Stanley Dean Witter Select Municipal Reinvestment Fund
       47  Morgan Stanley Dean Witter Short-Term Bond Fund
       48  Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust
       49  Morgan Stanley Dean Witter Special Value Fund
       50  Morgan Stanley Dean Witter S&P 500 Index Fund
       51  Morgan Stanley Dean Witter S&P 500 Select Fund
       52  Morgan Stanley Dean Witter Strategist Fund
       53  Morgan Stanley Dean Witter Tax-Exempt Securities Trust
       54  Morgan Stanley Dean Witter Tax-Free Daily Income Trust
       55  Morgan Stanley Dean Witter U.S. Government Money Market Trust
       56  Morgan Stanley Dean Witter U.S. Government Securities Trust
       57  Morgan Stanley Dean Witter Utilities Fund
       58  Morgan Stanley Dean Witter Value-Added Market Series
       59  Morgan Stanley Dean Witter Value Fund
       60  Morgan Stanley Dean Witter Variable Investment Series
       61  Morgan Stanley Dean Witter World Wide Income Trust
<CAPTION>
 
CLOSED-END FUNDS
<C>        <S>
 
        1  InterCapital California Insured Municipal Income Trust
        2  InterCapital California Quality Municipal Securities
        3  Dean Witter Government Income Trust
        4  High Income Advantage Trust
        5  High Income Advantage Trust II
        6  High Income Advantage Trust III
        7  InterCapital Income Securities Inc.
        8  InterCapital Insured California Municipal Securities
        9  InterCapital Insured Municipal Bond Trust
       10  InterCapital Insured Municipal Income Trust
       11  InterCapital Insured Municipal Securities
</TABLE>
    
 
                                       10
<PAGE>
   
<TABLE>
<C>        <S>
       12  InterCapital Insured Municipal Trust
       13  Municipal Income Opportunities Trust
       14  Municipal Income Opportunities Trust II
       15  Municipal Income Opportunities Trust III
       16  Municipal Income Trust
       17  Municipal Income Trust II
       18  Municipal Income Trust III
       19  Municipal Premium Income Trust
       20  InterCapital New York Quality Municipal Securities
       21  Morgan Stanley Dean Witter Prime Income Trust
       22  InterCapital Quality Municipal Income Trust
       23  InterCapital Quality Municipal Investment Trust
       24  InterCapital Quality Municipal Securities
</TABLE>
    
 
   
    In addition, Morgan Stanley Dean Witter Services Company Inc. ("MSDW
Services"), a wholly-owned subsidiary of MSDW Advisors, serves as manager for
the following investment companies for which TCW Funds Management, Inc. is the
investment advisor (the "TCW/DW Funds"):
    
   
<TABLE>
<CAPTION>
OPEN-END FUNDS
 
<C>        <S>
        1  TCW/DW Emerging Markets Opportunities Trust
        2  TCW/DW Global Telecom Trust
        3  TCW/DW Income and Growth Fund
        4  TCW/DW Latin American Growth Fund
        5  TCW/DW Mid-Cap Equity Trust
        6  TCW/DW North American Government Income Trust
        7  TCW/DW Small Cap Growth Fund
        8  TCW/DW Total Return Trust
 
<CAPTION>
 
CLOSED-END FUNDS
<C>        <S>
 
        1  TCW/DW Term Trust 2000
        2  TCW/DW Term Trust 2002
        3  TCW/DW Term Trust 2003
</TABLE>
    
 
   
    MSDW Advisors also serves as: (i) administrator of The BlackRock Strategic
Term Trust Inc., a closed-end investment company; (ii) sub-administrator of
Templeton Global Governments Income Trust, a closed-end investment company; and
(iii) investment advisor of Offshore Dividend Growth Fund and Offshore Money
Market Fund, mutual funds established under the laws of the Cayman Islands and
available only to investors who are participants in the International Active
Assets Account program and are neither citizens nor residents of the United
States.
    
 
INVESTMENT OBJECTIVE AND POLICIES
- - --------------------------------------------------------------------------------
 
    The Trust's investment objective is to provide a high level of current
income consistent with the preservation of capital. The Trust will seek to
achieve its objective through investment primarily in Senior Loans. Senior Loans
in which the Trust will invest generally pay interest at rates which float or
are reset at
 
                                       11
<PAGE>
a margin above a generally recognized base lending rate. These base lending
rates are the Prime Rate, LIBOR, the CD rate or other base lending rates used by
commercial lenders. The Prime Rate quoted by a major U.S. bank is the interest
rate at which such bank is willing to lend U.S. dollars to creditworthy
borrowers. LIBOR is an average of the interest rates quoted by several
designated banks as the rates at which such banks would offer to pay interest to
major financial institutional depositors in the London interbank market on U.S.
dollar-denominated deposits for a specified period of time. The CD rate is the
average rate paid on large certificates of deposit traded in the secondary
market. The Investment Advisor believes that over time the Trust's effective
yield will exceed money market rates and will track the movements in the
published Prime Rate of major U.S. banks, although it may not equal the Prime
Rate. An investment in the Trust may not be appropriate for all investors and is
not intended to be a complete investment program. No assurance can be given that
the Trust will achieve its investment objective.
 
    Under normal market conditions, the Trust will invest at least 80% of its
total assets in Senior Loans. The Trust currently intends to limit its
investments in Senior Notes to no more than 20% of its total assets. The
remainder of the Trust's assets may be invested in cash or in high quality debt
securities with remaining maturities of one year or less, although it is
anticipated that the debt securities in which the Trust invests will have
remaining maturities of 60 days or less. Such securities may include commercial
paper rated at least in the top two rating categories of either Standard &
Poor's Corporation or Moody's Investors Service, Inc., or unrated commercial
paper considered by the Investment Advisor to be of similar quality,
certificates of deposit and bankers' acceptances and securities issued or
guaranteed by the U.S. government, its agencies or instrumentalities. Such
securities may pay interest at rates which are periodically redetermined or may
pay interest at fixed rates. High quality debt securities and cash may comprise
up to 100% of the Trust's total assets during temporary defensive periods when,
in the opinion of the Investment Advisor, suitable Senior Loans are not
available for investment by the Trust or prevailing market or economic
conditions warrant.
 
   
    The Trust is not subject to any restrictions with respect to the maturity of
Senior Loans held in its portfolio. It is currently anticipated that at least
80% of the Trust's total assets invested in Senior Loans will consist of Senior
Loans with stated maturities of between three and ten years, inclusive, and with
rates of interest which are redetermined either daily, monthly or quarterly. As
a result of prepayments and amortization, however, it is expected that the
actual maturities of Syndicated Loans will be approximately three to four years
and of Senior Notes approximately six to seven years. The Senior Loans in the
Trust's portfolio will at all times have a dollar-weighted average time until
the next interest rate redetermination of 90 days or less.
    
 
   
    The Senior Loans in which the Trust will invest will consist primarily of
direct obligations of a Borrower undertaken to finance the growth of the
Borrower's business or to finance a capital restructuring. Such loans may
include "leveraged buy-out" loans which are made to a Borrower for the purpose
of acquiring ownership control of another company, whether as a purchase of
equity or of assets or for a leveraged reorganization of the Borrower with no
change in ownership. The Trust may invest in Senior Loans which are made to
non-U.S. Borrowers, provided that the loans are dollar-denominated and any such
Borrower meets the credit standards established by the Investment Advisor for
U.S. Borrowers.
    
 
    Senior Loans hold the most senior position in a Borrower's capital
structure, although some Senior Loans may hold an equal ranking with other
senior securities of the Borrower (i.e., have equal claims to the Borrower's
assets). In order to borrow money pursuant to Senior Loans, a Borrower will
frequently
 
                                       12
<PAGE>
pledge as collateral its assets, including, but not limited to, trademarks,
accounts receivable, inventory, buildings, real estate, franchises and common
and preferred stock in its subsidiaries. In addition, in the case of some Senior
Loans, there may be additional collateral pledged in the form of guarantees by
and/or securities of affiliates of the Borrowers. A Loan Agreement may also
require the Borrower to pledge additional collateral in the event that the value
of the collateral falls. In certain instances, a Senior Loan may be secured only
by stock in the Borrower or its subsidiaries. Each Senior Loan in which the
Trust will invest will be secured by collateral which the Investment Advisor
believes to have a market value, at the time of acquisition of the Senior Loan,
which equals or exceeds the principal amount of the Senior Loan. The value of
such collateral generally will be determined by an independent appraisal and/or
other information regarding the collateral furnished by the Agent. Such
information will generally include appraisals in the case of assets such as real
estate, buildings and equipment, audits in the case of inventory and analyses
(based upon, among other things, investment bankers' opinions, fairness opinions
and relevant transactions in the marketplace) in the case of other kinds of
collateral. Loan Agreements may also include various restrictive covenants
designed to limit the activities of the Borrower in an effort to protect the
right of the Lenders to receive timely payments of interest on and repayment of
principal of the Senior Loans. Restrictive covenants contained in a Loan
Agreement may include mandatory prepayment provisions arising from excess cash
flow and typically include restrictions on dividend payments, specific mandatory
minimum financial ratios, limits on total debt and other financial tests. Breach
of such covenants, if not waived by the Lenders, is generally an event of
default under the applicable Loan Agreement and may give the Lenders the right
to accelerate principal and interest payments.
 
   
    Nationally recognized rating agencies have begun assigning ratings to an
increasing number of Senior Loans and a substantial portion of the Fund's
investments in Senior Loans may be rated below investment grade. Debt securities
rated below investment grade are viewed by the rating agencies as having
speculative characteristics and are commonly known as "junk bonds." While the
Investment Advisor may consider such ratings when determining whether to invest
in a Senior Loan, it does not view ratings as a determinative factor in its
investment decisions. Rather, the Investment Advisor will perform its own credit
analysis of the Borrower and will consider, and may rely in part on, the
analyses performed by Lenders other than the Trust. The Trust will invest only
in those Senior Loans with respect to which the Borrower, in the opinion of the
Investment Advisor, demonstrates the ability to meet debt service in a timely
manner (taking into consideration the Borrower's capital structure, liquidity
and historical and projected cash flow) and where the Investment Advisor
believes that the market value of the collateral at the time of investment
equals or exceeds the amount of the Senior Loan. The Investment Advisor will
also consider the following characteristics: the operating history, competitive
position and management of the Borrower; the business outlook of the Borrower's
industry; the terms of the Loan Agreement (e.g., the nature of the covenants,
interest rate and fees and prepayment conditions); whether the Trust will
purchase an Assignment, Participation or act as a lender originating a Senior
Loan; and the creditworthiness of and quality of service provided by the Agent
and any Selling Participant or Intermediate Participants. Senior Loans presently
are not rated by nationally recognized statistical rating organizations.
    
 
    Senior Loans typically are arranged through private negotiations between a
Borrower and several financial institutions ("Lenders") represented in each case
by one or more of such Lenders acting as agent ("Agent") of the several Lenders.
On behalf of the several Lenders, the Agent, which is frequently the commercial
bank that originates the Senior Loan and the person that invites other parties
to join the
 
                                       13
<PAGE>
lending syndicate, typically will be primarily responsible for negotiating the
loan agreement or agreements ("Loan Agreement") that establish the relative
terms, conditions and rights of the Borrower and the several Lenders. In larger
transactions it is common to have several Agents; however, generally only one
such Agent has primary responsibility for documentation and administration of
the Senior Loan. Agents are typically paid a fee or fees by the Borrower for
their services.
 
   
    The Trust may invest in Senior Loans in the following ways: (i) it may
purchase Participations, (ii) it may purchase Assignments of a portion of a
Senior Loan, or (iii) it may act as one of the group of Lenders originating a
Senior Loan.
    
 
   
    When the Trust is a Lender, or assumes all of the rights of a Lender through
an assignment it will, as a party to the Loan Agreement, have a direct
contractual relationship with the Borrower and may enforce compliance by the
Borrower with the terms of the Loan Agreement. Lenders also have voting and
consent rights under the applicable Loan Agreement. Action subject to Lender
vote or consent generally requires the vote or consent of the holders of some
specified percentage of the outstanding principal amount of the Senior Loan,
which percentage varies depending on the relevant Loan Agreement. Certain
decisions, such as reducing the amount or increasing the time for payment of
interest on or repayment of principal of a Senior Loan, or releasing collateral
therefor, frequently require the unanimous vote or consent of all Lenders
affected.
    
 
    A Participation may be acquired from an Agent, a Lender or any other holder
of a Participation ("Selling Participant"). Investment by the Trust in a
Participation typically will result in the Trust having a contractual
relationship only with the Selling Participant, not with the Borrower or any
other entities interpositioned between the Trust and the Borrower ("Intermediate
Participants"). The Trust will have the right to receive payments of principal,
interest and any fees to which it is entitled only from the Selling Participant
and only upon receipt by such Selling Participant of such payments from the
Borrower. In connection with purchasing Participations, the Trust generally will
have no right to enforce compliance by the Borrower with the terms of the Loan
Agreement, nor any rights with respect to funds acquired by other Lenders
through set-off against the Borrower and the Trust may not directly benefit from
the collateral supporting the Senior Loan in which it has purchased the
Participation. As a result, the Trust will assume the credit risk of the
Borrower, the Selling Participant and any Intermediate Participants. In the
event of the insolvency of the Selling Participant or any Intermediate
Participant, the Trust may be treated as a general creditor of such entity and
may be adversely affected by any set-off between such entity and the Borrower.
The Trust will acquire Participations only if the Selling Participant and any
Intermediate Participant is a commercial bank or other financial institution
with an investment grade long-term debt rating from either Standard and Poor's
Corporation ("S&P") (rated BBB or higher) or Moody's Investors Service, Inc.
("Moody's") (rated Baa or higher), or with outstanding commercial paper rated at
least in the top two rating categories of either of such rating agencies (at
least A-2 by S&P or at least Prime-2 by Moody's) or, if such long-term debt and
commercial paper are unrated, with long-term debt or commercial paper believed
by the Investment Advisor to be of comparable quality. Long-term debt rated BBB
by S&P is regarded by S&P as having adequate capacity to pay interest and repay
principal and debt rated Baa by Moody's is regarded by Moody's as a medium grade
obligation, i.e., it is neither highly protected nor poorly secured, although
debt rated Baa by Moody's is considered to have speculative characteristics.
Commercial paper rated A-2 by S&P indicates that the degree of safety
 
                                       14
<PAGE>
   
regarding timely payment is considered by S&P to be strong, and issues of
commercial paper rated Prime-2 by Moody's are considered by Moody's to have a
strong capacity for repayment of senior short-term debt obligations.
    
 
    The Trust may also purchase Assignments from Lenders and other third
parties. The purchaser of an Assignment typically succeeds to all the rights of
the Lender or other third party whose interest is being assigned, but it may not
be a party to the Loan Agreement and may be required to rely on such Lender or
other third party to demand payment and enforce its rights against the Borrower.
Assignments are arranged through private negotiations between potential
assignors and potential assignees; consequently, the rights and obligations
acquired by the purchaser of an Assignment may differ from and be more limited
than those held by the assignor.
 
    In determining whether to purchase Participations or Assignments or act as
one of a group of Lenders, the Investment Advisor will consider the availability
of each of these forms of investments in Senior Loans, the terms of the Loan
Agreement, and in the case of Participations, the creditworthiness of the
Selling Participant and any Intermediate Participants.
 
   
    In connection with the purchase of interests in Senior Loans, the Trust may
also acquire warrants and other equity securities of the Borrower or its
affiliates. The acquisition of such equity securities will only be incidental to
the Trust's purchase of interests in Senior Loans.
    
 
   
    The investment objective of the Trust and its policy to invest, under normal
market conditions, at least 80% of its total assets in Senior Loans, are
fundamental policies of the Trust and may not be changed without the approval of
a majority of the outstanding voting securities of the Trust, as defined in the
1940 Act. Such a majority is defined as the lesser of (i) 67% or more of the
Trust's Shares present at a meeting of shareholders, if the holders of more than
50% of the outstanding Shares of the Trust are present or represented by proxy,
or (ii) more than 50% of the outstanding Shares of the Trust. Except as
otherwise specified, all other investment policies of the Trust are not
fundamental and may be changed by the Board of Trustees without shareholder
approval.
    
 
   
    The Trust may be required to pay and may receive various fees and
commissions in connection with purchasing, selling and holding interests in
Senior Loans. When the Trust buys an interest in a Senior Loan, it may receive a
facility fee, which is a fee paid to Lenders upon origination of a Senior Loan
and/or a commitment fee which is a fee paid to Lenders on an ongoing basis based
upon the undrawn portion committed by the Lenders of the underlying Senior Loan.
In certain circumstances, the Trust may receive a prepayment penalty on the
prepayment of a Senior Loan by a Borrower. When the Trust sells an interest in a
Senior Loan it may be required to pay fees or commissions to the purchaser of
the interest. The extent to which the Trust will be entitled to receive or be
required to pay such fees will generally be a matter of negotiation between the
Trust and the party selling to or purchasing from the Trust. The Investment
Advisor currently anticipates that the Trust will continue to receive and/or pay
fees and commissions in a majority of the transactions involving Senior Loans.
    
 
   
    Lenders commonly have certain obligations pursuant to the Loan Agreement,
which may include the obligation to make additional loans or release collateral
in certain circumstances. The Trust will maintain on its books a segregated
account with its custodian bank in which it will maintain cash or high quality
debt securities equal in value to its commitments to make such additional loans.
In no event will such commitments exceed 20% of the Trust's total assets.
    
 
                                       15
<PAGE>
   
RISK FACTORS
    
- - --------------------------------------------------------------------------------
 
   
GENERAL
    
 
   
    The Trust invests primarily in Senior Loans on which the interest rate is
periodically adjusted in response to interest rate changes on short-term
investments. This policy should result in a net asset value which fluctuates
less than would a portfolio consisting primarily of fixed rate obligations. A
number of factors may, however, cause a decline in net asset value, including a
default on a Senior Loan, a material deterioration of a Borrower's perceived or
actual credit worthiness, and/or an increase in interest rates not immediately
reflected in the interest rate payable on Senior Loans. A sudden and extreme
increase in interest rates is particularly likely to cause a decline in net
asset value. Also, a change in the manner in which interest rates on Senior
Loans are set (E.G., interest rates are set at a higher or lower margin above
the Prime Rate, LIBOR, or other base lending rate) or other changes in pricing
parameters for Senior Loans, may also cause the Trust's net asset value to
fluctuate.
    
 
   
ILLIQUIDITY OF SHARES
    
 
   
    An investment in the Shares should be considered illiquid. There is no
secondary market for the Shares and none is expected to develop.
    
 
   
CREDIT RISK
    
 
   
    Senior Loans are subject to credit risks. Credit risk is the risk that the
Borrower will fail to make timely payments of principal and/or interest. The
non-receipt of scheduled payments of principal or interest, either because of a
default, bankruptcy or other reason, could result in a reduction of the Trust's
yield and a decline in net asset value.
    
 
   
    The Trust may invest in Senior Loans made in connection with leveraged
buy-out transactions, recapitalizations and other highly leveraged transaction.
These types of Senior Loans are subject to greater risks than are other kinds of
Senior Loans in which the Trust may invest. The value of such loans may also be
subject to a greater degree of volatility in response to interest rate
fluctuations and may be less liquid than other kinds of Senior Loans.
    
 
   
    The Investment Advisor will invest only in Senior Loans secured by
collateral with a value, in its view, of at least equal to the amount of the
Senior Loan. There is no guarantee, however, that the collateral securing a
Senior Loan will be sufficient to protect the Trust against losses or a decline
in income in the event of the Borrower's non-payment of principal and/or
interest. For example, the value of the collateral could, subsequent to the
Trust's investment in the Senior Loan, decline below the amount of the Senior
Loan. In addition, it may not be possible to liquidate the collateral promptly.
Also, in the event that a Borrower declares bankruptcy, a court could invalidate
the Trust's security interest in the loan collateral, or subordinate the Trust's
rights under the Senior Loan to other creditors of the Borrower.
    
 
   
LOWER-RATED SECURITIES
    
 
   
    A substantial portion of the Senior Loans in which the Trust invests may be
rated by a national statistical rating organization below investment grade, or
if unrated, of comparable quality. Debt securities rated below investment grade,
or if unrated, of comparable quality, are commonly referred to as "junk bonds."
Junk bonds are regarded by the rating agencies as having speculative
characteristics. The prices of junk bonds are more sensitive to negative
corporate developments such as a decline in profits or adverse economic
conditions such as a recession than are the prices of higher rated securities.
    
 
                                       16
<PAGE>
   
LIMITED PUBLIC INFORMATION
    
 
   
    The amount of public information with respect to Senior Loans will generally
be less extensive than that available for securities registered with the
Securities and Exchange Commission and/or listed on a national securities
exchange. As a result, the performance of the Trust and its ability to meet its
investment objective is more dependent upon the analytical ability of the
Investment Advisor than would be the case for an investment company that invests
primarily in registered and/or exchange listed securities.
    
 
   
ILLIQUIDITY OF SENIOR LOANS
    
 
   
    Senior Loans may be transferable among financial institutions, however, they
do not, at present, have the liquidity of conventional debt securities and are
often subject to restrictions on resale. For example, bank approval is often
required for the resale of interests in Senior Loans. Due to the illiquidity of
Senior Loans the Trust may not be able to dispose of its investments in Senior
Loans in a timely fashion and at a fair price. The inability to do so could
result in losses to the Trust.
    
 
   
RELIANCE UPON AGENT
    
 
   
    An Agent typically administers a Senior Loan and is responsible for the
collection of principal and interest payments from the Borrower. The Trust will
generally rely on the Agent to collect and to transmit to the Trust its portion
of the payments on the Senior Loan. The Trust also generally will rely on the
Agent to monitor compliance by the Borrower with the terms of the Loan Agreement
and to notify the Trust of any adverse change in the Borrower's financial
condition or any declaration of insolvency. In addition, the Trust will rely on
the Agent to use appropriate creditor remedies against the Borrower in the event
of a default. Accordingly, the Trust's success may be dependent in part upon the
skill of Agents in administering the terms of Loan Agreements, monitoring
Borrower compliance, collecting principal, interest and fee payments from
Borrowers, and where necessary, enforcing creditors remedies against Borrowers.
    
 
   
    In the event that an Agent becomes insolvent, or has a receiver,
conservator, or similar official appointed for it by the appropriate bank
regulatory authority or becomes a debtor in a bankruptcy proceeding, the Agent's
appointment may be terminated, and a successor agent would be appointed. Assets
held by the Agent under the Loan Agreement should remain available to holders of
Loans. However, if assets held by the Agent for the benefit of the Trust were
determined by an appropriate regulatory authority or court to be subject to the
claims of the Agent's general or secured creditors, the Trust might incur
certain costs and delays in realizing payment on a Senior Loan or suffer a loss
of principal and/or interest. Furthermore, in the event of the Borrower's
bankruptcy or insolvency, the Borrower's obligation to repay the Loan may be
subject to certain defenses that the Borrower can assert as a result of improper
conduct by the Agent.
    
 
   
PARTICIPATIONS
    
 
   
    The Trust may invest in Participations. Because the holder of a
Participation generally has no contractual relationship with the Borrower, the
Trust will have to rely upon a Selling Participant and/or Intermediate
Participant to pursue appropriate remedies against a Borrower in the event of a
default. As a result, the Trust may be subject to delays, expenses and risks
that are greater than those that would be involved if the Trust could enforce
its rights directly against the Borrower or through the Agent.
    
 
                                       17
<PAGE>
   
    A Participation also involves the risks that the Trust may be regarded as a
creditor of a Selling Participant and/or Intermediate Participant rather than of
the Borrower. If so, the Trust would be subject to the risk that a Selling
Participant may become insolvent.
    
 
   
PREPAYMENTS
    
 
   
    Senior Loans may, in some cases, be permitted or required to be prepaid.
Prepayments could adversely affect the Trust's yield to the extent that the
Trust is unable to reinvest promptly payments in Senior Loans or if such
prepayments were made during a period of declining interest rates.
    
 
   
LOANS TO FOREIGN BORROWERS
    
 
   
    The Trust may invest in U.S. dollar denominated Senior Loans made to non
U.S. Borrowers. These Senior Loans may involve additional risks. Foreign
companies are not generally subject to uniform accounting and financial
reporting standards comparable to those applicable to U.S. borrowers. It may be
more difficult to value and monitor the value of collateral underlying Senior
Loans to non U.S. Borrowers. In addition, there is generally less government
supervision and regulation of financial markets and listed companies in foreign
countries than in the U.S. Investments in Senior Loans to non U.S. borrowers
also involves the risks of adverse political and economic developments. In
addition, such loans involve foreign currency risks to the extent that a decline
in a non U.S. Borrower's own currency relative to the dollar may impair such
Borrower's ability to make timely payments of principal and/or interest on a
Senior Loan.
    
 
   
CONCENTRATION
    
 
   
    The Trust will, in the case of its investments in Participations, treat each
Selling Participant, as well as the Borrower, as the issuer of a Senior Loan. As
a result, the Trust could be deemed to have invested more than 25% of its assets
in the industry group consisting of financial institutions and their holding
companies. Banking and thrift institutions are subject to extensive governmental
regulations which may limit both the amounts and types of loans and other
financial commitments which such institutions may make and the interest rates
and fees which such institutions may charge. The profitability of these
institutions is largely dependent on the availability and cost of capital funds,
and has shown significant recent fluctuation as a result of volatile interest
rate levels. In addition, general economic conditions are important to the
operations of these institutions, with exposure to credit losses resulting from
possible financial difficulties of borrowers potentially having an adverse
effect. Insurance companies also are affected by economic and financial
conditions and are subject to extensive government regulation, including rate
regulation. The property and casualty industry is cyclical, being subject to
dramatic swings in profitability which can be affected by natural catastrophes
and other disasters. Individual companies may be exposed to material risks,
including reserve inadequacy, latent health exposure, and inability to collect
from their reinsurance carriers. The financial services area is currently
undergoing relatively rapid change as existing distinctions between financial
service segments become less clear. In this regard, recent business combinations
have included insurance, finance and securities brokerage under single
ownership. Moreover, the federal laws generally separating commercial and
investment banking are currently being studied by Congress.
    
 
   
NON-DIVERSIFICATION
    
 
   
    The Trust may invest up to 10% of its assets in Senior Loans made to any
single Borrower. To the extent that the Trust invests a relatively high
percentage of its assets in the obligations of a limited
    
 
                                       18
<PAGE>
   
number of issuers, the value of the Trust's investments may be more affected by
any single adverse economic, political or regulatory event than will the value
of the investments of a more diversified investment company.
    
 
   
SENIOR NOTES
    
 
   
    The Trust is authorized to invest in Senior Notes. It is anticipated that
Senior Notes purchased by the Trust will generally bear a higher rate of
interest than Syndicated Loans. Such securities may, however, involve greater
risks than those associated with Syndicated Loans. The covenants and
restrictions to which the Borrower would be subject in the case of Senior Notes
may not be as rigorous in all respects as those to which the Borrower would be
subject in the case of a Syndicated Loan. Also, the scope of financial
information respecting the Borrower available to investors in Senior Notes may
be more limited than that available to Syndicated Loan Lenders. In addition, a
Syndicated Loan typically requires steady amortization of principal throughout
the life of the loan whereas Senior Notes, typically, are structured to allow
Borrowers to repay principal later in the life of the loan.
    
 
INVESTMENT PRACTICES
- - --------------------------------------------------------------------------------
 
    The following investment practices apply to the portfolio investments of the
Trust and may be changed by the Trustees of the Trust without shareholder
approval, following written notice to shareholders.
 
WHEN-ISSUED AND DELAYED DELIVERY TRANSACTIONS
 
    The Trust may purchase and sell interests in Senior Loans and other
securities in which the Trust may invest or dispose of on a when-issued or
delayed delivery basis; i.e., delivery and payment can take place more than 30
days after the date of the transaction. The interests or securities so purchased
or sold are subject to market fluctuation during this period and no interest
accrues to the purchaser prior to the date of settlement. At the time the Trust
makes the commitment to enter into a when-issued or delayed delivery
transaction, it will record the transaction and thereafter reflect the value,
each day, of such interest or security in determining the net asset value of the
Trust. At the time of delivery, the value of the interest or security may be
more or less than the purchase price. Since the Trust is dependent on the party
issuing the when-issued or delayed delivery security to complete the
transaction, failure by the other party to deliver the interest or security as
arranged would result in the Trust losing an investment opportunity. The Trust
will also establish a segregated account with its custodian bank in which it
will maintain cash or high quality debt securities equal in value to commitments
for such when-issued or delayed delivery interests or other securities; subject
to this requirement, the Trust may enter into transactions on such basis without
limit.
 
REPURCHASE AGREEMENTS
 
    When cash may be available for only a few days, it may be invested by the
Trust in repurchase agreements until such time as it may otherwise be invested
or used for payments of obligations of the Trust. These agreements, which may be
viewed as a type of secured lending by the Trust, typically involve the
acquisition by the Trust of debt securities from a selling financial institution
such as a bank, savings and loan association or broker-dealer. The agreement
provides that the Trust will sell back to the institution, and that the
institution will repurchase, the underlying security ("collateral"), which is
held by the Trust's custodian, at a specified price and at a fixed time in the
future, usually not more than seven days from the date of purchase. The Trust
will receive interest from the institution until the time when the
 
                                       19
<PAGE>
repurchase is to occur. Although such date is deemed by the Trust to be the
maturity date of a repurchase agreement, the maturities of securities subject to
repurchase agreements are not subject to any limits and may exceed one year.
While repurchase agreements involve certain risks not associated with direct
investments in debt securities, the Trust will follow procedures adopted by the
Trustees designed to minimize such risks. These procedures include effecting
repurchase transactions only with large, well-capitalized and well-established
financial institutions, whose financial condition will be continually monitored
by the Investment Advisor. In addition, the value of the collateral underlying
the repurchase agreement will be maintained at a level at least equal to the
repurchase price, including any accrued interest earned on the repurchase
agreement. In the event of a default or bankruptcy by a selling financial
institution, the Trust will seek to liquidate such collateral. However, the
exercising of the Trust's right to liquidate such collateral could involve
certain costs or delays and, to the extent that proceeds from any sale upon a
default of the obligation to repurchase were less than the repurchase price, the
Trust could suffer a loss. In addition, to the extent that the Trust's security
interest in the collateral may not be properly perfected, the Trust could suffer
a loss up to the entire amount of the collateral. It is the policy of the Trust
not to invest in repurchase agreements that do not mature within seven days if
any such investments amount to more than 10% of its total assets.
 
REVERSE REPURCHASE AGREEMENTS
 
    The Trust may enter into reverse repurchase agreements with respect to debt
obligations which could otherwise be sold by the Trust. A reverse repurchase
agreement is an instrument under which the Trust may sell an underlying debt
instrument and simultaneously obtain the commitment of the purchaser (a
commercial bank or a broker or dealer) to sell the security back to the Trust at
an agreed upon price on an agreed upon date. The value of the underlying
securities will be at least equal at all times to the total amount of the resale
obligation, including the interest factor. Reverse repurchase agreements could
involve certain risks in the event of default or insolvency of the other party,
including possible delays or restrictions upon the Trust's ability to dispose of
the underlying securities. An additional risk is that the market value of
securities sold by the Trust under a reverse repurchase agreement could decline
below the price at which the Trust is obligated to repurchase them. Reverse
repurchase agreements will be considered borrowings by the Trust and as such
would be subject to the restrictions on borrowing described below under
"Investment Restrictions." The Trust will not hold more than 5% of the value of
its total assets in reverse repurchase agreements.
 
LENDING OF PORTFOLIO SECURITIES
 
    Consistent with applicable regulatory requirements, the Trust may lend its
portfolio securities to brokers, dealers and financial institutions, provided
that such loans are callable at any time by the Trust (subject to notice
provisions described below), and are at all times secured by cash or cash
equivalents, which are maintained in a segregated account pursuant to applicable
regulations and that are equal to at least 102% of the market value, determined
daily, of the loaned securities. The advantage of such loans is that the Trust
continues to receive the income on collateral, which will be invested in
short-term obligations. The Trust will not lend its portfolio securities if such
loans are not permitted by the laws or regulations of any state in which its
shares are qualified for sale and will not lend more than 25% of the value of
its total assets.
 
    A loan may be terminated by the borrower on one business day's notice, or by
the Trust on four business days' notice. If the borrower fails to deliver the
loaned securities within four days after receipt of notice, the Trust could use
the collateral to replace the securities while holding the borrower liable for
any
 
                                       20
<PAGE>
excess of replacement cost over collateral. As with any extensions of credit,
there are risks of delay in recovery and in some cases even loss of rights in
the collateral should the borrower of the securities fail financially. However,
these loans of portfolio securities will be made only to firms deemed by the
Investment Advisor to be creditworthy and when the income which can be earned
from such loans justifies the attendant risks. Upon termination of the loan, the
borrower is required to return the securities to the Trust. Any gain or loss in
the market price during the loan period would inure to the Trust. The
creditworthiness of firms to which the Trust lends its portfolio securities will
be monitored on an ongoing basis by the Investment Advisor pursuant to
procedures adopted and reviewed, on an ongoing basis, by the Trustees of the
Trust.
 
    When voting on consent rights which accompany loaned securities pass to the
borrower, the Trust will follow the policy of calling the loaned securities, to
be delivered within one day after notice, to permit the exercise of such rights
if the matters involved would have a material effect on the Trust's investment
in such loaned securities. The Trust will pay reasonable finder's,
administrative and custodial fees in connection with a loan of its securities.
 
BORROWING
 
    The Trust may borrow money from a bank for temporary or emergency purposes
or to effect a tender offer for its Shares provided that immediately after such
borrowing the amount borrowed does not exceed 33 1/3% of the value of its total
assets (including the amount borrowed) less its liabilities (not including any
borrowings but including the fair market value at the time of computation of any
other senior securities then outstanding). If, due to market fluctuations or
other reasons, the value of the Trust's assets falls below the foregoing
required coverage requirement, the Trust, within three business days, will
reduce its bank debt to the extent necessary to comply with such requirement. To
achieve such reduction, it is possible that the Trust may be required to sell
portfolio securities at a time when it may be disadvantageous to do so.
 
    Borrowings other than for temporary or emergency purposes would involve
additional risk to the Trust, since the interest expense may be greater than the
income from or appreciation of the interests carried by the borrowing. The Trust
may be required to maintain minimum average balances in connection with
borrowings or to pay a commitment or other fee to maintain a line of credit.
Either of these requirements will increase the cost of borrowing over the stated
interest rate. Investment activity will continue while the borrowing is
outstanding. The purchase of additional interests while any borrowing is
outstanding involves the speculative factor known as "leverage," which will
increase the Trust's exposure to capital risk.
 
HEDGING AND RISK MANAGEMENT TRANSACTIONS
 
    The Trust is authorized to engage in various interest rate hedging
transactions and risk management transactions, including interest rate swaps and
the purchase and sale of interest rate caps and floors. These techniques are
described in Appendix A. The Trust does not, however, presently intend to engage
in such hedging and risk management transactions, and, if the Trust is offering
its Shares, will not do so unless and until the Trust's prospectus is revised to
reflect this change.
 
                                       21
<PAGE>
INVESTMENT RESTRICTIONS
- - --------------------------------------------------------------------------------
 
    The investment restrictions listed below have been adopted by the Trust as
fundamental policies, which may not be changed without the vote of a majority,
as defined in the 1940 Act, of the outstanding voting securities of the Trust.
All other investment policies or practices, other than the Trust's investment
policy with respect to Senior Loans, are considered by the Trust not to be
fundamental and accordingly may be changed without shareholder approval. All
percentage limitations apply immediately after a purchase or initial investment,
and any subsequent change in any applicable percentage resulting from market
fluctuations or other changes in the amount of total or net assets does not
require elimination of any security from the portfolio.
 
    The Trust may not:
 
     1. Invest more than 25% of the Trust's total assets in the securities of
any one issuer or, with respect to 50% of the Trust's total assets, purchase any
securities (other than obligations issued or guaranteed by the United States
Government or by its agencies or instrumentalities), if as a result more than 5%
of the Trust's total assets would then be invested in securities of a single
issuer or if as a result the Trust would hold more than 10% of the outstanding
voting securities of any single issuer. For purposes of this restriction and
restriction number two, the Trust will consider a Borrower to be the issuer of a
Participation and, with respect to Participations under which the Trust does not
have privity with the Borrower or would not have a direct cause of action
against the Borrower in the event of its failure to pay scheduled principal or
interest, the Trust will also separately meet the requirements contained in this
investment restriction and consider each person interpositioned between the
Borrower and the Trust to be an issuer of the Participation.
 
     2. Invest 25% or more of the value of its total assets in securities of
issuers in any one industry (the electric, gas, water and telephone utility
industries will be treated as separate industries for purposes of this
restriction); provided that this limitation shall not apply with respect to
obligations issued or guaranteed by the U.S. Government or by its agencies or
instrumentalities; and provided further that the Trust will (once at least 80%
of the Trust's assets are invested in Senior Loans) invest more than 25% and may
invest up to 100% of its total assets in securities of issuers in the industry
group consisting of financial institutions and their holding companies,
including commercial banks, thrift institutions, insurance companies and finance
companies. (See restriction number one for the definition of issuer for purposes
of this restriction.)
 
     3. Invest in common stock, except that the Trust may acquire warrants or
other equity securities incidental to the purchase of an interest in a Senior
Loan.
 
     4. Invest in securities of any issuer if, to the knowledge of the Trust,
any officer or trustee of the Trust or any officer or director of the Investment
Advisor or DWR owns more than 1/2 of 1% of the outstanding securities of such
issuer, and such officers, trustees and directors who own more than 1/2 of 1%
own in the aggregate more than 5% of the outstanding securities of such issuer.
 
     5. Purchase or sell real estate or interests therein, commodities or
commodity contracts except pursuant to the exercise by the Trust of its rights
under Loan Agreements, except to the extent the
 
                                       22
<PAGE>
interest in Senior Loans the Trust may invest in are considered to be interests
in real estate, commodities or commodities contracts and except to the extent
that hedging instruments the Trust may invest in are considered to be
commodities or commodities contracts.
 
     6. Purchase oil, gas or other mineral leases, rights or royalty contracts,
or exploration or development programs, except pursuant to the exercise by the
Trust of its rights under Loan Agreements. In addition, the Trust may purchase
securities of issuers which deal in, represent interests in or are secured by
interests in such leases, rights or contracts.
 
     7. Write, purchase or sell puts, calls or combinations thereof, except for
options on futures contracts or options on debt securities.
 
     8. Purchase securities of other investment companies, except in connection
with a merger, consolidation, reorganization or acquisition of assets or, by
purchase in the open market of securities of closed-end investment companies
where no underwriter's or dealer's commission or profit, other than customary
broker's commissions, is involved and only if immediately thereafter not more
than: (a) 5% of the Trust's total assets would be invested in any one such
company and (b) 10% of the Trust's total assets would be invested in such
securities. The Trust will rely on representations of Borrowers in Loan
Agreements in determining whether such Borrowers are investment companies.
 
     9. Borrow money, except that the Trust may borrow from a bank for temporary
or emergency purposes or for the repurchase of Shares, provided that immediately
after such borrowing the amount borrowed does not exceed 33 1/3% of the value of
its total assets (including the amount borrowed) less its liabilities (not
including any borrowings but including the fair market value at the time of
computation of any other senior securities which are outstanding at the time).
 
    10. Pledge, mortgage or hypothecate its assets or assign or otherwise
encumber them, except to secure borrowings effected within the limitations set
forth in Restriction 9 (and then only to the extent of 33 1/3% of the value of
the Trust's total assets) and except pursuant to reverse repurchase agreements
as provided in this Prospectus. However, for the purpose of this restriction,
collateral arrangements with respect to the writing of options and collateral
arrangements with respect to initial margin for futures are not deemed to be
pledges of assets.
 
    11. Issue senior securities, as defined in the 1940 Act, except insofar as
the Trust may be deemed to have issued a senior security by reason of: (a)
entering into any repurchase agreement; (b) purchasing any securities on a
when-issued or delayed delivery basis; (c) entering into the hedging
transactions described in this prospectus, including Appendix A; (d) borrowing
money in accordance with restrictions described above; or (e) lending portfolio
securities.
 
    12. Make loans of money or securities, except: (a) by acquiring interests in
Senior Loans and making other permitted investments in accordance with its
investment objective; (b) by entering into repurchase agreements (provided that
no more than 10% of the Trust's total assets will be invested in repurchase
agreements that do not mature within seven days) or reverse repurchase
agreements; and (c) by lending its portfolio securities (provided that the Trust
may not lend its portfolio securities in excess of 25% of its total assets).
 
    13. Make short sales of securities.
 
                                       23
<PAGE>
    14. Purchase securities on margin. Neither the deposit of initial or
variation margin in connection with hedging transactions nor short-term credits
as may be necessary for the clearance of such transactions is considered the
purchase of a security on margin.
 
    15. Engage in the underwriting of securities, except to the extent the Trust
may be deemed to be an underwriter in connection with the sale of or granting of
interests in Senior Loans or other securities acquired by the Trust.
 
    16. Make investments for the purpose of exercising control or management of
any other issuer, except to the extent that exercise by the Trust of its rights
under Loan Agreements would be deemed to constitute such control or
participation.
 
   
    The Trust generally will not engage in the trading of securities for the
purpose of realizing short-term profits, but it will adjust its portfolio as it
deems advisable in view of prevailing or anticipated market conditions to
accomplish the Trust's investment objective. For example, the Trust may sell
portfolio securities in anticipation of a movement in interest rates. Frequency
of portfolio turnover will not be a limiting factor if the Trust considers it
advantageous to purchase or sell securities. The Trust anticipates that the
annual portfolio turnover rate of the Trust will be less than 100%. A high rate
of portfolio turnover involves correspondingly greater expenses than a lower
rate, which expenses must be borne by the Trust and its shareholders. High
portfolio turnover also may result in the realization of substantial net
short-term capital gains. In order to continue to qualify as a regulated
investment company for federal income tax purposes, less than 30% of the annual
gross income of the Trust must be derived from the sale of securities held by
the Trust for less than three months. See "Taxation." The Trust's portfolio
turnover rate for the fiscal year ended September 30, 1998 was 68%.
    
 
TRUSTEES AND OFFICERS
- - --------------------------------------------------------------------------------
 
   
    The Trustees and Executive Officers of the Trust and their principal
occupations for at least the last five years and their affiliations, if any,
with MSDW Advisors and with the 85 Morgan Stanley Dean Witter Funds and the 11
TCW/DW Funds are shown below.
    
 
   
<TABLE>
<CAPTION>
           NAME, AGE, POSITION WITH THE TRUST
                      AND ADDRESS                               PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- - --------------------------------------------------------  --------------------------------------------------------
<S>                                                       <C>
Michael Bozic (57) .....................................  Vice Chairman of Kmart Corporation (commencing December,
Trustee                                                   1998); Director or Trustee of the Morgan Stanley Dean
c/o Kmart Corporation                                     Witter Funds; formerly Chairman and Chief Executive
3100 West Big Beaver Road                                 Officer of Levitz Furniture Corporation (November,
Troy, Michigan                                            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 and Co.; Director of Eaglemark Financial
                                                          Services, Inc. and Weirton Steel Corporation.
</TABLE>
    
 
                                       24
<PAGE>
   
<TABLE>
<CAPTION>
           NAME, AGE, POSITION WITH THE TRUST
                      AND ADDRESS                               PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- - --------------------------------------------------------  --------------------------------------------------------
<S>                                                       <C>
Charles A. Fiumefreddo* (65) ...........................  Chairman, Director or Trustee, President and Chief
Chairman,                                                 Executive Officer of the Morgan Stanley Dean Witter
President, Chief Executive Officer and Trustee            Funds; Chairman, Chief Executive Officer and Trustee of
Two World Trade Center                                    the TCW/DW Funds; formerly Chairman, Chief Executive
New York, New York                                        Officer and Director of MSDW Advisors, MSDW Distributors
                                                          and MSDW Services, Executive Vice President and Director
                                                          of Dean Witter Reynolds Inc. ("DWR"), Chairman and
                                                          Director of Morgan Stanley Dean Witter Trust FSB ("MSDW
                                                          Trust"), and Director and/or officer of various MSDW
                                                          subsidiaries (until June 1998).
 
Edwin J. Garn (66) .....................................  Director or Trustee of the Morgan Stanley Dean Witter
Trustee                                                   Funds; formerly United States Senator (R- Utah)
c/o Huntsman Corporation                                  (1974-1992) and Chairman, Senate Banking Committee
500 Huntsman Way                                          (1980-1986); formerly Mayor of Salt Lake City, Utah
Salt Lake City, Utah                                      (1971-1974); formerly Astronaut, Space Shuttle Discovery
                                                          (April 12-19, 1985); Vice Chairman, Huntsman Corporation
                                                          (since January, 1993); Director of Franklin Covey (time
                                                          management systems) and John Alden Financial Corp.
                                                          (health insurance), United Space Alliance (joint venture
                                                          between Lockheed Martin and the Boeing Company) and
                                                          Nuskin Asia Pacific (multilevel marketing); Member of
                                                          the board of various civic and charitable organizations.
 
John R. Haire (73) .....................................  Chairman of the Audit Committee and Director or Trustee
Trustee                                                   of the Morgan Stanley Dean Witter Funds; Chairman of the
Two World Trade Center                                    Audit Committee and Trustee of the TCW/DW Funds;
New York, New York                                        formerly Chairman of the Independent Directors or
                                                          Trustees of the Morgan Stanley Dean Witter Funds and the
                                                          TCW/DW Funds (until June, 1998); formerly President,
                                                          Council for Aid to Education (1978-1989) and Chairman
                                                          and Chief Executive Officer of Anchor Corporation, an
                                                          Investment Advisor (1964-1978).
</TABLE>
    
 
                                       25
<PAGE>
   
<TABLE>
<CAPTION>
           NAME, AGE, POSITION WITH THE TRUST
                      AND ADDRESS                               PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- - --------------------------------------------------------  --------------------------------------------------------
<S>                                                       <C>
Wayne E. Hedien (64) ...................................  Retired; Director or Trustee of the Morgan Stanley Dean
Trustee                                                   Witter Funds; Director of the PMI Group, Inc. (Private
c/o Gordon Altman Butowsky Weitzen                        mortgage insurance); Trustee and Vice Chairman of the
 Shalov & Wein                                            Field Museum of Natural History; formerly associated
Counsel to the Independent Trustees                       with the Allstate Companies (1966-1994), most recently
114 West 47th Street                                      as Chairman of the Allstate Corporation (March,
New York, New York                                        1993-December, 1994) and Chairman and Chief Executive
                                                          Officer of its wholly-owned subsidiary, Allstate
                                                          Insurance Company (July, 1989-December, 1994); director
                                                          of various other business and charitable organizations.
 
Dr. Manuel H. Johnson (49) .............................  Senior Partner, Johnson Smick International, Inc., a
Trustee                                                   consulting firm; Co-Chairman and a founder of the Group
c/o Johnson Smick International, Inc.                     of Seven Council (G7C), an international economic
1133 Connecticut Avenue, N.W.                             commission; Director or Trustee of the Morgan Stanley
Washington, D.C.                                          Dean Witter Funds; Trustee of the TCW/DW Funds; Director
                                                          of NASDAQ (since June, 1995); Director of Greenwich
                                                          Capital Markets, Inc. (broker-dealer) and NVR, Inc.
                                                          (home construction); Chairman and Trustee of the
                                                          Financial Accounting Foundation (oversight organization
                                                          of the Financial Accounting Standards Board); formerly
                                                          Vice Chairman of the Board of Governors of the Federal
                                                          Reserve System (1986-1990) and Assistant Secretary of
                                                          the U.S. Treasury (1982-1986).
 
Michael E. Nugent (62) .................................  General Partner, Triumph Capital, L.P., a private
Trustee                                                   investment partnership; Director or Trustee of the
c/o Triumph Capital, L.P.                                 Morgan Stanley Dean Witter Funds; Trustee of the TCW/DW
237 Park Avenue                                           Funds; formerly Vice President, Bankers Trust Company
New York, New York                                        and BT Capital Corporation (1984-1988); director of
                                                          various business organizations.
 
Philip J. Purcell* (55) ................................  Chairman of the Board of Directors and Chief Executive
Trustee                                                   Officer of MSDW, DWR and Novus Credit Services Inc.;
Two World Trade Center                                    Director of MSDW Distributors; Director or Trustee of
New York, New York                                        the Morgan Stanley Dean Witter Funds; Director and/or
                                                          officer of various MSDW subsidiaries.
</TABLE>
    
 
                                       26
<PAGE>
   
<TABLE>
<CAPTION>
           NAME, AGE, POSITION WITH THE TRUST
                      AND ADDRESS                               PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- - --------------------------------------------------------  --------------------------------------------------------
<S>                                                       <C>
John L. Schroeder (68) .................................  Retired; Director or Trustee of the Morgan Stanley Dean
Trustee                                                   Witter Funds; Trustee of the TCW/DW Funds; Director of
c/o Gordon Altman Butowsky Weitzen                        Citizens Utilities Company; formerly, Executive Vice
 Shalov & Wein                                            President and Chief Investment Officer of the Home
Counsel to the Independent Trustees                       Insurance Company (August, 1991-September, 1995).
114 West 47th St.
New York, New York
 
Barry Fink (43) ........................................  Senior Vice President (since March, 1997), Secretary and
Vice President, Secretary and General Counsel             General Counsel (since February, 1997) and Director
Two World Trade Center                                    (since July, 1998) of MSDW Advisors and MSDW Services;
New York, New York                                        Senior Vice President (since March, 1997) and Assistant
                                                          Secretary and Assistant General Counsel (since February,
                                                          1997) of MSDW Distributors; Assistant Secretary of DWR
                                                          (since August, 1996); Vice President, Secretary and
                                                          General Counsel of the Dean Witter Funds and the TCW/DW
                                                          Funds (since February, 1997); previously First Vice
                                                          President (June, 1993-February, 1997), Vice President
                                                          and Assistant Secretary and Assistant General Counsel of
                                                          MSDW Advisors and MSDW Services and Assistant Secretary
                                                          of the Morgan Stanley Dean Witter Funds and the TCW/DW
                                                          Funds.
 
Rajesh K. Gupta (38) ...................................  Senior Vice President of MSDW Advisors; Vice President
Vice President                                            of various Morgan Stanley Dean Witter Funds.
Two World Trade Center
New York, New York
 
Sheila A. Finnerty (33) ................................  Vice President of MSDW Advisors (since May, 1998);
Assistant Vice President                                  previously Assistant Vice President (May, 1995-May,
Two World Trade Center                                    1998) and Senior Research Analyst (May, 1993-May, 1995)
New York, New York                                        with MSDW Advisors.
 
Peter Gewirtz (33) .....................................  Assistant Vice President of MSDW Advisors (since May,
Assistant Vice President                                  1998); previously Senior Research Analyst with MSDW
Two World Trade Center                                    Advisors (October, 1996-May, 1998) and prior thereto
New York, New York                                        Assistant Vice President of Industrial Bank of Japan
                                                          (February, 1994-October, 1996) and an Associate of
                                                          Toronto-Dominion Bank (July, 1991-February, 1994).
</TABLE>
    
 
                                       27
<PAGE>
<TABLE>
<CAPTION>
           NAME, AGE, POSITION WITH THE TRUST
                      AND ADDRESS                               PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- - --------------------------------------------------------  --------------------------------------------------------
<S>                                                       <C>
Thomas F. Caloia (52) ..................................  First Vice President and Assistant Treasurer of MSDW
Treasurer                                                 Advisors and MSDW Services; Treasurer of the Morgan
Two World Trade Center                                    Stanley Dean Witter Funds and the TCW/DW Funds.
New York, New York
</TABLE>
 
- - ------------------------
*   Denotes Trustees who are "interested persons" of the Trust, as defined in
    the 1940 Act.
 
   
    In addition, Mitchell M. Merin, President, Chief Executive Officer and
Director of MSDW Advisors and MSDW Services, Chairman and Director of MSDW
Distributors and MSDW Trust, Executive Vice President of DWR, and Director of
various MSDW subsidiaries, Robert M. Scanlan, President, Chief Operating Officer
and Director of MSDW Advisors and MSDW Services, Executive Vice President of
MSDW Distributors and MSDW Trust and Director of MSDW Trust, Ronald E. Robison,
Executive Vice President and Chief Administrative Officer of MSDW Advisors and
MSDW Services, Robert S. Giambrone, Senior Vice President of MSDW Advisors, MSDW
Services, MSDW Distributors and MSDW Trust and Director of MSDW Trust, and
Joseph J. McAlinden, Executive Vice President and Chief Investment Officer of
MSDW Advisors and Director of MSDW Trust are Vice Presidents of the Fund, and
Marilyn K. Cranney and Carsten Otto, First Vice Presidents and Assistant General
Counsels of MSDW Advisors and MSDW Services, Frank Bruttomesso, LouAnne D.
McInnis and Ruth Rossi, Vice Presidents and Assistant General Counsels of MSDW
Advisors and MSDW Services, and Todd Lebo, a staff attorney with MSDW Advisors,
are Assistant Secretaries of the Fund.
    
 
THE BOARD OF TRUSTEES, THE INDEPENDENT TRUSTEES, AND THE COMMITTEES
 
   
    The Board of Trustees consists of nine (9) trustees. These same individuals
also serve as directors or trustees for all of the Morgan Stanley Dean Witter
Funds, and are referred to in this section as Trustees. As of the date of this
Statement of Additional Information, there are a total of 85 Morgan Stanley Dean
Witter Funds, comprised of 121 portfolios. As of October 31, 1998, the Morgan
Stanley Dean Witter Funds had total net assets of approximately $109.2 billion
and more than six million shareholders.
    
 
    Seven Trustees (77% of the total number) have no affiliation or business
connection with MSDW Advisors or any of its affiliated persons and do not own
any stock or other securities issued by MSDW Advisors' parent company, MSDW.
These are the "disinterested" or "independent" Trustees. Four of the seven
independent Trustees are also Independent Trustees of the TCW/DW Funds.
 
    Law and regulation establish both general guidelines and specific duties for
the Independent Trustees. The Morgan Stanley Dean Witter Funds seek as
Independent Trustees individuals of distinction and experience in business and
finance, government service or academia; these are people whose advice and
counsel are in demand by others and for whom there is often competition. To
accept a position on the Funds' Boards, such individuals may reject other
attractive assignments because the Funds make substantial demands on their time.
Indeed, by serving on the Funds' Boards, certain Trustees who would otherwise be
qualified and in demand to serve on bank boards would be prohibited by law from
doing so.
 
   
    All of the Independent Trustees serve as members of the Audit Committee and
the Committee of the Independent Trustees. Three of them also serve as members
of the Derivatives Committee. In addition,
    
 
                                       28
<PAGE>
   
three of the Trustees, including two Independent Trustees, serve as members of
the Insurance Committee. During the calendar year ended December 31, 1997, the
Audit Committee, the Derivatives Committee and the Independent Trustees held a
combined total of seventeen meetings.
    
 
    The Independent Trustees are charged with recommending to the full Board
approval of management, advisory and administration contracts, Rule 12b-1 plans
and distribution and underwriting agreements; continually reviewing Fund
performance; checking on the pricing of portfolio securities, brokerage
commissions, transfer agent costs and performance, and trading among Funds in
the same complex; and approving fidelity bond and related insurance coverage and
allocations, as well as other matters that arise from time to time. The
Independent Trustees are required to select and nominate individuals to fill any
Independent Trustee vacancy on the Board of any Fund that has a Rule 12b-1 plan
of distribution. Most of the Morgan Stanley Dean Witter Funds have such a plan.
 
    The Audit Committee is charged with recommending to the full Board the
engagement or discharge of the Trust's independent accountants; directing
investigations into matters within the scope of the independent accountants'
duties, including the power to retain outside specialists; reviewing with the
independent accountants the audit plan and results of the auditing engagement;
approving professional services provided by the independent accountants and
other accounting firms prior to the performance of such services; reviewing the
independence of the independent accountants; considering the range of audit and
non-audit fees; and reviewing the adequacy of the Trust's system of internal
controls.
 
   
    The Board of each Fund has formed a Derivatives Committee to approve
parameters for and monitor the activities of the Trust with respect to
derivative investments, if any, made by the Trust.
    
 
   
    Finally, the Board of each Fund has formed an Insurance Committee to review
and monitor the insurance coverage maintained by the Fund.
    
 
ADVANTAGES OF HAVING SAME INDIVIDUALS AS INDEPENDENT TRUSTEES FOR ALL MORGAN
STANLEY DEAN WITTER FUNDS
 
    The Independent Trustees and the Funds' management believe that having the
same Independent Trustees for each of the Morgan Stanley Dean Witter Funds
avoids the duplication of effort that would arise from having different groups
of individuals serving as Independent Trustees for each of the Funds or even of
sub-groups of Funds. They believe that having the same individuals serve as
Independent Trustees of all the Funds tends to increase their knowledge and
expertise regarding matters which affect the Fund complex generally and enhances
their ability to negotiate on behalf of each Fund with the Fund's service
providers. This arrangement also precludes the possibility of separate groups of
Independent Trustees arriving at conflicting decisions regarding operations and
management of the Funds and avoids the cost and confusion that would likely
ensue. Finally, having the same Independent Trustees serve on all Fund Boards
enhances the ability of each Fund to obtain, at modest cost to each separate
Fund, the services of Independent Trustees of the caliber, experience and
business acumen of the individuals who serve as Independent Trustees of the
Morgan Stanley Dean Witter Funds.
 
COMPENSATION OF INDEPENDENT TRUSTEES
 
    The Trust pays each Independent Trustee an annual fee of $800 plus a per
meeting fee of $50 for meetings of the Board of Trustees, the Independent
Trustees or Committees of the Board of Trustees attended by the Trustee (the
Fund pays the Chairman of the Audit Committee an additional annual fee of $750).
If a Board meeting and a meeting of the Independent Trustees or a Committee
meeting, or a meeting of the Independent Trustees and/or more than one Committee
meeting, take place on a single day, the Trustees are paid a single meeting fee
by the Trust. The Trust also reimburses such Trustees for travel and other
out-of-pocket expenses incurred by them in connection with attending such
meetings.
 
                                       29
<PAGE>
Trustees and officers of the Trust who are or have been employed by the
Investment Manager or an affiliated company receive no compensation or expense
reimbursement from the Trust for their services as Trustee. Mr. Haire currently
serves as Chairman of the Audit Committee. Prior to June 1, 1998, Mr. Haire also
served as Chairman of the Independent Trustees, for which services the Trust
paid him an additional annual fee of $1,200.
 
   
    The following table illustrates the compensation paid to the Trust's
Independent Trustees by the Fund for the fiscal year ended September 30, 1998.
    
 
                               TRUST COMPENSATION
 
   
<TABLE>
<CAPTION>
                                                                   AGGREGATE
                                                                 COMPENSATION
NAME OF INDEPENDENT TRUSTEE                                      FROM THE FUND
- - --------------------------------------------------------------  ---------------
<S>                                                             <C>
Michael Bozic.................................................      $1,500
Edwin J. Garn.................................................       1,650
John R. Haire.................................................       2,900
Wayne E. Hedien...............................................       1,932
Dr. Manuel H. Johnson.........................................       1,600
Michael E. Nugent.............................................       1,650
John L. Schroeder.............................................       1,650
</TABLE>
    
 
    The following table illustrates the compensation paid to the Trust's
Independent Trustees for the calendar year ended December 31, 1997 for services
to the 84 Morgan Stanley Dean Witter Funds and, in the case of Messrs. Haire,
Johnson, Nugent and Schroeder, the 14 TCW/DW Funds that were in operation at
December 31, 1997. Mr. Haire serves as Chairman of the Audit Committee of each
Morgan Stanley Dean Witter Fund and each TCW/DW Fund and, prior to June 1, 1998,
also served as Chairman of the Independent Directors or Trustees of those Funds.
With respect to Messrs. Haire, Johnson, Nugent and Schroeder, the TCW/DW Funds
are included solely because of a limited exchange privilege between those Funds
and five Morgan Stanley Dean Witter Money Market Funds. Mr. Hedien's term as
Director or Trustee of each Morgan Stanley Dean Witter Fund commenced on
September 1, 1997.
 
    CASH COMPENSATION FROM MORGAN STANLEY DEAN WITTER FUNDS AND TCW/DW FUNDS
 
<TABLE>
<CAPTION>
                                                                   FOR SERVICE AS                    TOTAL CASH
                                                                    CHAIRMAN OF      FOR SERVICE    COMPENSATION
                               FOR SERVICE                          INDEPENDENT          AS              FOR
                              AS DIRECTOR OR                       DIRECTORS/TRUSTEES  CHAIRMAN OF   SERVICES TO
                               TRUSTEE AND                           AND AUDIT       INDEPENDENT         84
                                COMMITTEE        FOR SERVICE AS    COMMITTEES OF      TRUSTEES         MORGAN
                               MEMBER OF 84       TRUSTEE AND            84           AND AUDIT        STANLEY
                              MORGAN STANLEY       COMMITTEE       MORGAN STANLEY   COMMITTEES OF    DEAN WITTER
NAME OF                        DEAN WITTER        MEMBER OF 14      DEAN WITTER          14         FUNDS AND 14
INDEPENDENT TRUSTEE               FUNDS           TCW/DW FUNDS         FUNDS        TCW/DW FUNDS    TCW/DW FUNDS
- - ---------------------------  ----------------   ----------------   --------------   -------------   -------------
<S>                          <C>                <C>                <C>              <C>             <C>
Michael Bozic..............      $133,602           --                 --               --            $133,602
Edwin J. Garn..............       149,702           --                 --               --             149,702
John R. Haire..............       149,702           $73,725           $157,463        $ 25,350         406,240
Wayne E. Hedien............        39,010           --                 --               --              39,010
Dr. Manuel H. Johnson......       145,702            71,125            --               --             216,827
Michael E. Nugent..........       149,702            73,725            --               --             223,427
John L. Schroeder..........       149,702            73,725            --               --             223,427
</TABLE>
 
    As of the date of this Statement of Additional Information, 57 of the Morgan
Stanley Dean Witter Funds, including the Trust, have adopted a retirement
program under which an Independent Trustee who retires after serving for at
least five years (or such lesser period as may be determined by the Board)
 
                                       30
<PAGE>
as an Independent Director or Trustee of any Morgan Stanley Dean Witter Fund
that has adopted the retirement program (each such Fund referred to as an
"Adopting Fund" and each such Trustee referred to as an "Eligible Trustee") is
entitled to retirement payments upon reaching the eligible retirement age
(normally, after attaining age 72). Annual payments are based upon length of
service. Currently, upon retirement, each Eligible Trustee is entitled to
receive from the Adopting Fund, commencing as of his or her retirement date and
continuing for the remainder of his or her life, an annual retirement benefit
(the "Regular Benefit") equal to 29.41% of his or her Eligible Compensation plus
0.4901667% of such Eligible Compensation for each full month of service as an
Independent Director or Trustee of any Adopting Fund in excess of five years up
to a maximum of 58.82% after ten years of service. The foregoing percentages may
be changed by the Board.(1) "Eligible Compensation" is one-fifth of the total
compensation earned by such Eligible Trustee for service to the Adopting Fund in
the five year period prior to the date of the Eligible Trustee's retirement.
Benefits under the retirement program are not secured or funded by the Adopting
Funds.
 
   
    The following table illustrates the retirement benefits accrued to the
Trust's Independent Trustees by the Fund for the fiscal year ended September 30,
1998 and by the 57 Morgan Stanley Dean Witter Funds (including the Fund) for the
year ended December 31, 1997, and the estimated retirement benefits for the
Fund's Independent Trustees, to commence upon their retirement, from the Trust
as of September 30, 1998 and from the 57 Morgan Stanley Dean Witter Funds as of
December 31, 1997.
    
 
  RETIREMENT BENEFITS FROM THE TRUST AND ALL MORGAN STANLEY DEAN WITTER FUNDS
 
   
<TABLE>
<CAPTION>
                                            FOR ALL ADOPTING FUNDS           RETIREMENT BENEFITS           ESTIMATED ANNUAL
                                     ------------------------------------    ACCRUED AS EXPENSES               BENEFITS
                                          ESTIMATED                                                       UPON RETIREMENT(2)
                                       CREDITED YEARS        ESTIMATED     -----------------------      -----------------------
                                        OF SERVICE AT      PERCENTAGE OF                 BY ALL           FROM       FROM ALL
                                         RETIREMENT          ELIGIBLE       BY THE      ADOPTING           THE       ADOPTING
NAME OF INDEPENDENT TRUSTEE             (MAXIMUM 10)       COMPENSATION      TRUST       FUNDS            TRUST        FUNDS
- - -----------------------------------  -------------------  ---------------  ---------  ------------      ---------   -----------
<S>                                  <C>                  <C>              <C>        <C>               <C>         <C>
Michael Bozic......................              10             58.82%     $     408  $     20,499      $   1,029   $    55,026
Edwin J. Garn......................              10             58.82            626        30,878          1,029        55,026
John R. Haire......................              10             58.82            (44 (3)      (19,823)(3)     2,418     132,002
Wayne E. Hedien....................               9             50.00            589             0            875        46,772
Dr. Manuel H. Johnson..............              10             58.82            248        12,832          1,029        55,026
Michael E. Nugent..................              10             58.82            435        22,546          1,029        55,026
John L. Schroeder..................               8             49.02            816        39,350            861        46,123
</TABLE>
    
 
- - ------------------------
(1) An Eligible Trustee may elect alternate payments of his or her retirement
    benefits based upon the combined life expectancy of such Eligible Trustee
    and his or her spouse on the date of such Eligible Trustee's retirement. The
    amount estimated to be payable under this method, through the remainder of
    the later of the lives of such Eligible Trustee and spouse, will be the
    actuarial equivalent of the Regular Benefit. In addition, the Eligible
    Trustee may elect that the surviving spouse's periodic payment of benefits
    will be equal to either 50% or 100% of the previous periodic amount, an
    election that, respectively, increases or decreases the previous periodic
    amount so that the resulting payments will be the actuarial equivalent of
    the Regular Benefit.
 
(2) Based on current levels of compensation. Amount of annual benefits also
    varies depending on the Trustee's elections described in Footnote (1) above.
 
(3) This number reflects the effect of the extension of Mr. Haire's term as
    Director or Trustee until May 1, 1999.
 
    As of the date of this Statement of Additional Information, the aggregate
number of shares of beneficial interest of the Trust owned by the Trust's
officers and Trustees as a group was less than 1 percent of the Trust's shares
of beneficial interest outstanding.
 
                                       31
<PAGE>
INVESTMENT ADVISORY AGREEMENT
- - --------------------------------------------------------------------------------
 
    The Trust has retained the Investment Advisor to manage the Trust's assets,
including the placing of orders for the purchase and sale of portfolio
securities, pursuant to an Investment Advisory Agreement with MSDW Advisors (the
"Advisory Agreement"). See "The Trust and Its Advisor" for a detailed
description of the Advisory Agreement.
 
    The Investment Advisor obtains and evaluates such information and advice
relating to the economy, securities markets, and specific securities as it
considers necessary or useful to manage continuously the assets of the Trust in
a manner consistent with its investment objective and policies. The Trust's
Board of Trustees reviews the various services provided by the Investment
Advisor to ensure that the Trust's general investment policies and programs are
being properly carried out. Under the terms of the Advisory Agreement, the
Investment Advisor pays the salaries of all personnel, including officers of the
Trust, who are employees of the Investment Advisor.
 
    Expenses not expressly assumed by the Investment Advisor under the Advisory
Agreement will be paid by the Trust. The expenses borne by the Trust include,
but are not limited to: charges and expenses of any registrar, custodian, stock
transfer and dividend disbursing agent; brokerage commissions; taxes; engraving
and printing of share certificates; registration costs of the Trust's Shares in
this continuous offering under federal and state securities laws; all expenses
of shareholders' and Trustees' meetings and of preparing, printing and mailing
proxy statements and reports to shareholders; fees and travel expenses of
Trustees or members of any advisory board or committee who are not employees or
retired employees of the Investment Advisor or any corporate affiliate thereof;
all expenses incident to any dividend or distribution program; charges and
expenses of any outside service used for pricing of the Trust's investments;
fees and expenses of legal counsel, including counsel to the Trustees who are
not interested persons of the Trust or of the Investment Advisor (not including
compensation or expenses of attorneys who are employees of the Investment
Advisor) and independent accountants; membership dues of industry associations;
interest on Trust borrowings; fees and expenses incident to Trust borrowings;
postage; insurance premiums on property or personnel (including officers and
trustees) of the Trust which inure to its benefit; extraordinary expenses
(including, but not limited to, legal claims and liabilities and litigation
costs and any indemnification relating thereto); and all other costs of the
Trust's operation.
 
   
    As full compensation for the services furnished to the Trust, the Trust pays
MSDW Advisors pursuant to the Advisory Agreement, monthly compensation
calculated daily at an annual rate of 0.90% of average daily net assets on
assets of the Trust up to $500 million, at an annual rate of 0.85% of average
daily net assets on assets of the Trust exceeding $500 million up to $1.5
billion and at an annual rate of 0.825% of average daily net assets on assets of
the Trust exceeding $1.5 billion. The sum of this fee and the administration fee
is higher than that paid by most other investment companies. See "Administrator
and Administration Agreement." For the fiscal years ended September 30, 1996,
1997 and 1998, the Trust accrued to MSDW Advisors total compensation of
$6,524,700, $9,981,012 and $14,434,352, respectively.
    
 
    The Advisory Agreement provides that in the absence of willful misfeasance,
bad faith, gross negligence or reckless disregard of its obligations thereunder,
the Investment Advisor is not liable to the Trust or any of its shareholders for
any act or omission by the Investment Advisor or for any losses sustained by the
Trust or its shareholders. The Advisory Agreement in no way restricts the
Investment Advisor from acting as investment manager or advisor to others.
 
                                       32
<PAGE>
    The Advisory Agreement was initially approved by the Trustees on February
21, 1997 and by the shareholders of the Fund at a Special Meeting of
Shareholders held on May 20, 1997. The Advisory Agreement is substantially
identical to a prior investment advisory agreement which was initially approved
by the Trustees on December 23, 1992 and by the Trust's shareholders on February
25, 1993 (the "Prior Advisory Agreement"). The Advisory Agreement took effect on
May 31, 1997 upon the consummation of the merger of Dean Witter, Discover & Co.
with Morgan Stanley Group Inc. The Advisory Agreement may be terminated at any
time, without penalty, on 30 days' notice by the Trustees of the Trust, by the
holders of a majority, as defined in the 1940 Act, of the outstanding Shares of
the Trust, or by the Investment Advisor. The Advisory Agreement will
automatically terminate in the event of its assignment (as defined in the 1940
Act).
 
    Under its terms, the Advisory Agreement with MSDW Advisors had an initial
term ending April 30, 1999, and will continue from year to year thereafter,
provided continuance of the Advisory Agreement is approved at least annually by
the vote of the holders of a majority (as defined in the 1940 Act) of the
outstanding voting securities of the Trust, or by the Trustees of the Trust;
provided that in either event such continuance is approved annually by the vote
of a majority of the Trustees of the Trust who are not parties to the Advisory
Agreement or "interested persons" (as defined in the 1940 Act) of any such party
(the "Independent Trustees"), which vote must be cast in person at a meeting
called for the purpose of voting on such approval.
 
ADMINISTRATOR AND ADMINISTRATION AGREEMENT
- - --------------------------------------------------------------------------------
 
    On December 31, 1993, MSDW Advisors effected an internal reorganization
pursuant to which certain administrative activities previously performed by MSDW
Advisors would instead be performed by Morgan Stanley Dean Witter Services
Company Inc. (the "Administrator" or "MSDW Services"), a wholly-owned subsidiary
of MSDW Advisors. Accordingly, the Administration Agreement between MSDW
Advisors and the Trust was terminated and a new Administration Agreement between
the Administrator and the Trust was entered into. The foregoing internal
reorganization did not result in any change of the management of the Trust's
Administrator. The nature and scope of the administrative services being
provided to the Trust or any of the fees being paid by the Trust under the new
Administration Agreement are identical to those of the previous Agreement. The
term "Administrator" refers to MSDW Advisors prior to this reorganization and to
MSDW Services after December 31, 1993. Morgan Stanley Dean Witter Distributors
Inc., the Distributor of the Trust's shares, is an affiliate of MSDW Advisors
and MSDW Services and a wholly-owned subsidiary of MSDW.
 
   
    In an earlier internal reorganization which took place in January, 1993,
DWR's investment company-related operations, pursuant to which the
administration activities that had been performed by DWR's InterCapital Division
were assumed by the then new company, Morgan Stanley Dean Witter Advisors Inc.,
and the share distribution activities that had been performed by DWR were
assumed by a separate new company, Morgan Stanley Dean Witter Distributors Inc.
MSDW Advisors refers to the MSDW Advisor Division of DWR prior to the internal
reorganization and to Morgan Stanley Dean Witter Advisors Inc. after the
reorganization. This internal reorganization did not result in a change of
management of the Administrator or Distributor.
    
 
    Under the terms of the Administration Agreement, the Administrator maintains
certain of the Trust's books and records and furnishes, at its own expense, such
office space, facilities, equipment, clerical
 
                                       33
<PAGE>
help, and bookkeeping and certain legal services as the Trust may reasonably
require in the conduct of its business, including the preparation of proxy
statements and reports required to be filed with federal and state securities
commissions (except insofar as the participation or assistance of independent
accountants and attorneys is, in the opinion of the Administrator, necessary or
desirable). In addition, the Administrator pays the salaries of all personnel,
including officers of the Trust who are employees of the Administrator. The
Administrator also bears the cost of telephone service, heat, light, power and
other utilities provided to the Trust.
 
   
    As full compensation for the services and facilities furnished to the Trust
and expenses of the Trust assumed by the Administrator, the Trust pays the
Administrator monthly compensation calculated daily by applying the annual rate
of 0.25% to the Trust's average daily net assets. The sum of this fee and the
investment advisory fee is higher than that paid by most other investment
companies. See "Investment Advisory Agreement." During the fiscal years ended
September 30, 1996, 1997 and 1998, total accrued compensation amounted to
$1,845,500, $2,862,062 and $4,183,528, respectively.
    
 
    The Administration Agreement provides that in the absence of willful
misfeasance, bad faith, gross negligence or reckless disregard of its
obligations thereunder, the Administrator is not liable to the Trust or any of
its shareholders for any act or omission by the Administrator or for any losses
sustained by the Trust or its shareholders. The Administration Agreement in no
way restricts the Administrator from acting as administrator or investment
manager or advisor to others.
 
    The Administration Agreement was initially approved by the Trustees on April
17, 1996, in connection with the reincorporation of MSDW Services in the State
of Delaware. The Administration Agreement is substantially identical to the
prior administration agreement, initially approved by the Trustees on October
10, 1989, by the Investment Advisor as the sole shareholder on November 20, 1989
and by the Trust's shareholders at a Meeting of Shareholders on June 19, 1991
(the "Prior Administration Agreement"). At their meeting held on October 30,
1992, the Trustees of the Trust including all the Trustees of the Trust who are
not parties to the Administration Agreement or "interested persons" (as defined
in the Act) of any such party (the "Independent Trustees"), approved the
assumption by MSDW Advisors of DWR's rights and duties under the Prior
Administration Agreement, which assumption took place upon the reorganization
described above. The Administration Agreement may be terminated at any time,
without penalty, on thirty days notice by the Trustees of the Trust, by the
holders of a majority, as defined in the 1940 Act, of the outstanding Shares of
the Trust, or by the Administrator. The Administration Agreement will
automatically terminate in the event of its assignment (as defined in the 1940
Act).
 
    Under its terms, the new Administration Agreement with MSDW Services had an
initial term ending April 30, 1997, and provides that it will continue from year
to year thereafter, provided continuance of the Administration Agreement is
approved at least annually by the vote of the holders of a majority (as defined
in the 1940 Act) of the outstanding voting securities of the Trust, or by the
Trustees of the Trust; provided that in either event such continuance is
approved annually by the vote of a majority of the Independent Trustees, which
vote must be cast in person at a meeting called for the purpose of voting on
such approval. At their meeting held on April 30, 1998, the Trust's Board of
Trustees, including all of the Independent Trustees, approved continuation of
the Administration Agreement until April 30, 1999.
 
                                       34
<PAGE>
PORTFOLIO TRANSACTIONS
- - --------------------------------------------------------------------------------
 
    Subject to the general supervision of the Board of Trustees, the Investment
Advisor is responsible for decisions to buy and sell interests in Senior Loans
and other securities and effect hedging transactions for the Trust, the
selection of brokers and dealers to effect the transactions, and the negotiation
of brokerage commissions, if any. With respect to interests in Senior Loans, the
Trust generally will engage in privately negotiated transactions for their
purchase or sale in which the Investment Advisor will negotiate on behalf of the
Trust. The Trust may be required to pay fees, or forgo a portion of interest and
any fees payable to the Trust, to the Selling Participant or the entity selling
an Assignment to the Trust. The Investment Advisor will determine the Lenders
and Selling Participants from whom the Trust will purchase Assignments and
Participations by considering their professional ability, level of service,
relationship with the Borrower, financial condition, credit standards and
quality of management. The secondary market for interests in Senior Loans is
relatively illiquid. Although the Trust intends generally to hold interests in
Senior Loans until maturity or prepayment of the Senior Loan, such illiquidity
may restrict the ability of the Investment Advisor to locate in a timely manner
persons willing to purchase the Trust's interests in Senior Loans at a fair
price should the Trust desire to sell such interests. See "Investment Objective
and Policies."
 
   
    With respect to portfolio securities other than Senior Loans, the Trust
expects that the primary market for the securities in which it intends to invest
will generally be the over-the-counter market. Such securities are generally
traded in the over-the-counter market on a "net" basis with dealers acting as
principal for their own accounts without charging a stated commission, although
the price of the security usually includes a profit to the dealer. The Trust
also expects that securities will be purchased at times in underwritten
offerings, where the price includes a fixed amount of compensation, generally
referred to as the underwriter's concession or discount. On occasion, the Trust
may also purchase certain money market instruments directly from an issuer, in
which case no commissions or discounts are paid. During the fiscal years ended
September 30, 1996, 1997 and 1998, the Trust did not pay any brokerage
commissions.
    
 
    The policy of the Trust regarding purchases and sales of Senior Loans and
securities and futures contracts for its portfolio is that primary consideration
will be given to obtaining the most favorable prices and efficient execution of
transactions. In seeking to implement the Trust's policies, the Investment
Advisor will effect transactions with those banks, brokers and dealers which the
Investment Advisor believes provide the most favorable prices and who are
capable of providing efficient executions. If the Investment Advisor believes
such price and execution are obtainable from more than one bank, broker or
dealer, it may give consideration to placing portfolio transactions with those
banks, brokers and dealers who also furnish research and other services to the
Trust or the Investment Advisor. Such services may include, but are not limited
to, any one or more of the following: information as to the availability of
securities for purchase or sale; statistical or factual information or opinions
pertaining to investment; wire services; and appraisals or evaluations of
portfolio securities.
 
    The information and services received by the Investment Advisor from banks,
brokers and dealers may be of benefit to the Investment Advisor and its
affiliates in the management of other accounts and may not in all cases benefit
the Trust directly. While the receipt of such information and services is useful
in varying degrees and would generally reduce the amount of research or services
otherwise performed
 
                                       35
<PAGE>
by the Investment Advisor and thus reduce its expenses, it is of indeterminable
value and the advisory fee paid to the Investment Advisor is not reduced by any
amount that may be attributable to the value of such services.
 
    Consistent with the policy described above, brokerage transactions in
securities listed on exchanges or admitted to unlisted trading privileges may be
effected through DWR, Morgan Stanley & Co. Incorporated ("MS & Co.") and other
affiliated brokers and dealers. In order for an affiliated broker or dealer to
effect any portfolio transactions for the Fund, the commissions, fees or other
remuneration received by the affiliated broker or dealer must be reasonable and
fair compared to the commissions, fees or other remuneration paid to other
brokers in connection with comparable transactions involving similar securities
being purchased or sold on an exchange during a comparable period of time. This
standard would allow the affiliated broker or dealer to receive no more than the
remuneration which would be expected to be received by an unaffiliated broker in
a commensurate arm's-length transaction. Furthermore, the Board of Trustees of
the Fund, including a majority of the Trustees who are not "interested" persons
of the Fund, as defined in the Act, have adopted procedures which are reasonably
designed to provide that any commissions, fees or other remuneration paid to an
affiliated broker or dealer are consistent with the foregoing standard.
 
DETERMINATION OF NET ASSET VALUE
- - --------------------------------------------------------------------------------
 
    The net asset value per share of the Trust's Shares is determined by
calculating the total value of the Trust's assets, deducting its total
liabilities, and dividing the result by the number of Shares outstanding. The
net asset value will be computed as of 4:00 p.m. New York time on each business
day on which the New York Stock Exchange is open for trading (or, on days when
the New York Stock Exchange closes prior to 4:00 p.m., at such earlier time).
The Trust reserves the right to calculate the net asset value more frequently if
deemed desirable.
 
    Interests in Senior Loans held by the Trust are currently valued at their
fair value in accordance with procedures established in good faith by the Board
of Trustees of the Trust. Under the procedures adopted by the Board of Trustees,
interests in Senior Loans will be priced in accordance with a matrix which takes
into account the relationship between the then current interest rate and
interest rates payable on each Senior Loan, as well as the total number of days
in each interest period and the period remaining until next interest rate
determination or maturity of the Senior Loan. Adjustments in the matrix-
determined price of a Senior Loan are made in the event of a default on a Senior
Loan or a significant change in the creditworthiness of the Borrower and may
also be required in the event of changes in pricing parameters for newly issued
Senior Loans (e.g., interest rates are set at a higher or lower margin above the
base lending rate than were Senior Loans in the Trust's portfolio). Loans
purchased at a discount from par for reasons other than credit impairment are
valued at cost and the discount is amortized to maturity. In assessing the
creditworthiness of a Borrower, the primary focus is on the ability and intent
of the Borrower to continue to meet its principal and interest payment
obligations specified under the applicable Loan Agreement. Such factors as the
Borrower's current and projected cash flow relative to its debt service
requirements and liquidity are considered in this regard. S&P and Moody's
ratings of any outstanding commercial paper of a Borrower may also be
considered. The procedures are monitored by the Board of Trustees on an ongoing
basis to insure that the values arrived at continue to represent fair value.
Should the Board of Trustees determine that the market for Senior Loans has
 
                                       36
<PAGE>
developed to the point where market quotations provided by banks, dealers or
pricing services respecting interests in Senior Loans could reliably serve as a
basis for valuing the Trust's portfolio securities, such quotations would be
used as a basis for valuing interests in Senior Loans held by the Trust. Other
portfolio securities traded in the over-the-counter market will be valued based
upon closing bid prices; provided, however, that short-term securities with
remaining maturities of less than 60 days will be valued at amortized cost.
Other assets are valued at fair value in accordance with procedures established
in good faith by the Board of Trustees of the Trust.
 
DIVIDENDS AND DISTRIBUTIONS
- - --------------------------------------------------------------------------------
 
    It is the Trust's present policy, which may be changed by the Board of
Trustees, to declare daily and pay monthly dividends to shareholders from net
investment income of the Trust. Distributions to holders of Shares cannot be
assured, and the amount of each monthly distribution is expected to vary. The
Trust intends to distribute all of the Trust's net investment income on an
annual basis. Net investment income of the Trust consists of all interest income
and fee and other ordinary income earned by the Trust on its portfolio assets,
less all expenses of the Trust. The Trust will distribute its capital gains
(after offset for any available loss carryovers), if any, at least once per
year, but it may make such distributions on a more frequent basis to comply with
the distribution requirements of the Tax Reform Act of 1986, as amended, but in
all events in a manner consistent with the 1940 Act.
 
    All dividends and capital gains distributions are reinvested automatically
in full and fractional Shares at the net asset value per Share determined on the
payable date of such dividend or distribution. A shareholder may, at any time,
by written notification to the Transfer Agent, elect to have subsequent
dividends or capital gains distributions, or both, paid in cash rather than
reinvested, in which event payment will be mailed on or about the payment date.
 
TAXATION
- - --------------------------------------------------------------------------------
 
    Because the Trust intends to distribute all of its net investment income and
capital gains to shareholders and intends to otherwise comply with all the
provisions of Subchapter M of the Internal Revenue Code of 1986 (the "Code"), it
is not expected that the Trust will be required to pay any federal income tax on
such income and capital gains. If, however, any such capital gains are retained,
the Trust will pay federal income tax thereon. In such a case, the Trust may
make an election pursuant to which shareholders would have to include such
retained gains in their income but would be able to claim their share of the tax
paid by the Trust as a credit against their individual federal income tax.
 
    Shareholders will normally have to pay federal income taxes, and any state
income taxes, on the dividends and distributions they receive from the Trust.
Such dividends and distributions derived from net investment income or
short-term capital gains are taxable to the shareholders as ordinary income
regardless of whether the shareholder receives such distributions in additional
Shares or in cash. It is not expected that any portion of such dividends and
distributions will be eligible for the corporate dividends received deduction.
 
    Long-term or short-term capital gains may be generated by the sale of
portfolio securities and by certain transactions in options and futures
contracts engaged in by the Trust. Distributions of long-term capital gains, if
any, are taxable to shareholders as long-term capital gains regardless of how
long a
 
                                       37
<PAGE>
shareholder has held the Trust's shares and regardless of whether the
distribution is received in additional Shares or in cash. Capital gains
distributions are not eligible for the dividends-received deduction.
 
   
    The IRS Restructuring and Reform Act of 1998 reduced the holding period
requirement for the capital gain rate of 20% to more than 12 months for
transactions occuring afer January 1, 1998. These lower rates do not apply to
collectibles and certain other assets. Additionally, the maximum capital gain
rate for assets that are held more than 5 years and that are acquired after
December 31, 2000 is 18%.
    
 
    Any distribution in excess of the Trust's earnings and profits will first
reduce a shareholder's adjusted basis in his Shares to zero and, after such
basis is reduced to zero, will constitute gain to the shareholder from the sale
of Shares.
 
    A holder of Shares who either sells his Shares or, pursuant to a tender
offer, tenders all Shares owned by such shareholder and any Shares considered
owned by such shareholder under attribution rules contained in the Code will
realize a taxable gain or loss depending upon such shareholder's basis in the
Shares. Such gain or loss will generally be treated as capital gain or loss and
will be long-term capital gain or loss if the Shares are held for more than one
year. However, any loss on a sale or exchange of Shares held for six months or
less will be treated as long-term capital loss to the extent of any long-term
capital gain distribution with respect to such Shares.
 
    If a tendering holder of Shares tenders less than all Shares owned by or
attributed to such shareholder, and if the distribution to such shareholder does
not otherwise qualify as a payment in exchange for stock, the proceeds received
will be treated as a taxable dividend, return of capital or capital gain
depending on the Trust's earnings and profits and the shareholder's basis in the
tendered Shares. Also, if some tendering holders of Shares receive taxable
dividends, there is a risk that non-tendering holders of Shares may be
considered to have received a deemed distribution which may be a taxable
dividend in whole or in part.
 
    The Code requires each regulated investment company to pay a nondeductible
4% excise tax to the extent the company does not distribute, during each
calendar year, 98% of its ordinary income, determined on a calendar year basis,
and 98% of its capital gains, determined, in general, on an October 31 year end,
plus certain undistributed amounts from previous years. The Trust anticipates
that it will make sufficient timely distributions to avoid imposition of the
excise tax. If the Trust pays a dividend in January which was declared in the
previous calendar quarter to shareholders of record on a date in such calendar
quarter, then such dividend or distribution will be treated for tax purposes as
being paid in December and will be taxable to shareholders as if received in
December.
 
    Any dividend or capital gains distribution received by a shareholder from an
investment company will have the effect of reducing the net asset value of the
shareholder's stock in that company by the exact amount of the dividend or
capital gains distribution. Furthermore, capital gains distributions and
dividends are subject to federal income taxes. If the net asset value of the
shares should be reduced below a shareholder's cost as a result of the
distribution of realized long-term capital gains, such distribution would be in
part a return of the shareholder's investment to the extent of such reduction
below the shareholder's cost, but nonetheless would be taxable to the
shareholder. Therefore, an investor should consider the tax implications of
purchasing Shares immediately prior to a distribution record date.
 
                                       38
<PAGE>
    The tax treatment of listed put and call options written or purchased by the
Trust on debt securities and of futures contracts entered into by the Trust will
generally be governed by Section 1256 of the Code, pursuant to which each such
position held by the Trust will be marked-to-market (i.e., treated as if it were
sold for fair market value) on the last business day of each taxable year of the
Trust, and all gain or loss associated with transactions in such positions will
be treated as 60% long-term capital gain or loss and 40% short-term capital gain
or loss. Positions of the Trust which consist of at least one debt security and
at least one option or futures contract which substantially diminishes the
Trust's risk of loss with respect to such debt security could be treated as
"mixed straddles" which are subject to the straddle rules of Section 1092 of the
Code, the operation of which may cause deferral of losses, adjustments in the
holding periods of debt securities and conversion of short-term capital losses
into long-term capital losses. Certain tax elections exist for mixed straddles
which reduce or eliminate the operation of the straddle rules. The Trust will
monitor its transactions in options and futures contracts and may make certain
tax elections in order to mitigate the effect of these rules and prevent
disqualification of the Trust as a regulated investment company under Subchapter
M of the Code. Such tax elections may result in an increase in distributions of
ordinary income (relative to long-term capital gain) to shareholders.
 
    The federal income tax treatment of interest rate swaps is not entirely
clear. The Trust may be required to treat payments received under such
arrangements as ordinary income and to amortize such payments under certain
circumstances. The Trust will limit its activity in this regard in order to
maintain its qualification as a regulated investment company.
 
    The Fund may at times make payments from sources other than income or net
capital gains. Payments from such sources will in effect, represent a return of
a portion of each shareholder's investment. All, or a portion, of such payments
will not be taxable to shareholders.
 
   
    After the end of each calendar year, shareholders will receive full
information on their dividends and capital gains distributions for tax purposes.
Shareholders who receive distributions of Shares which are automatically
reinvested will generally be viewed as receiving a distribution equal to the
fair market value of such Shares.
    
 
    To avoid being subject to a 31% federal backup withholding tax on taxable
dividends, capital gains distributions and the proceeds of redemptions and
repurchases, shareholders' taxpayer identification numbers must be furnished and
certified as to their accuracy.
 
    Ordinary income dividends and distributions paid by the Trust to
shareholders who are non-resident aliens will be subject to a 30% United States
withholding tax under existing provisions of the Code applicable to foreign
individuals and entities unless a reduced rate of withholding or a withholding
exemption is provided under applicable treaty law. Non-resident shareholders are
urged to consult their own tax advisors concerning the applicability of the
United States withholding tax.
 
    The above discussion is only a brief summary of some of the significant tax
consequences of investing in the Trust. Shareholders should consult their tax
advisors regarding specific questions as to state or local taxes and as to the
applicability of the foregoing to their current federal tax situation.
 
                                       39
<PAGE>
DESCRIPTION OF SHARES
- - --------------------------------------------------------------------------------
 
GENERAL
 
    The Trust's Declaration of Trust permits the Trustees to issue an unlimited
number of full and fractional shares of beneficial interest, of $.01 par value
("Shares"). Share certificates will be issued to the holder of record of Shares
upon request. Currently, Shares will be required to be held of record by the
investor. The investor's broker may not be reflected as the record holder;
however, arrangements for Shares to be held in "street name" may be implemented
in the future.
 
    Shareholders are entitled to one vote for each Share held and to vote on
matters submitted to meetings of shareholders. No material amendment may be made
to the Trust's Declaration of Trust without the affirmative vote of at least a
majority of its Shares represented in person or by proxy at a meeting at which a
quorum is present or by written consent without a meeting. Under certain
circumstances the Trustees may be removed by action of the Trustees. The
shareholders also have the right under certain circumstances to remove the
Trustees. Shares have no preemptive or conversion rights and when issued are
fully paid and non-assessable.
 
    The Trust's Declaration of Trust permits the Trustees to divide or combine
the Shares into a greater or lesser number of Shares without thereby changing
the proportionate beneficial interests in the Trust. Each Share represents an
equal proportionate interest in the Trust with each other Share.
 
    The Trust may be terminated (i) by the affirmative vote of the holders of
66% of its outstanding Shares or (ii) by an instrument signed by a majority of
the Trustees and consented to by the holders of two-thirds of the Trust's
outstanding Shares. Upon termination of the Trust, the Trustees will wind up the
affairs of the Trust, the Trust's business will be liquidated and the Trust's
net assets will be distributed to the Trust's shareholders on a pro rata basis.
If not so terminated, the Trust will continue indefinitely.
 
    The Trust is an entity of the type commonly known as a "Massachusetts
business trust." Under Massachusetts law, shareholders of such a trust may,
under certain circumstances, be held personally liable as partners for its
obligations. However, the Declaration of Trust contains an express disclaimer of
shareholder liability for acts or obligations of the Trust, requires that Trust
documents include such disclaimer, and provides for indemnification and
reimbursement of expenses out of the Trust's property for any shareholder held
personally liable for the obligations of the Trust. Thus, the risk of a
shareholder incurring financial loss on account of shareholder liability is
limited to circumstances in which the Trust itself would be unable to meet its
obligations. Given the nature of the Trust's assets and operations, the
possibility of the Trust being unable to meet its obligations is remote. Given
the above limitations on shareholders' personal liability and the Trust's
ability to meet its indemnification obligations, in the opinion of Massachusetts
counsel to the Trust, the risk to Trust shareholders of personal liability is
remote.
 
    The Declaration of Trust further provides that obligations of the Trust are
not binding upon the Trustees individually but only upon the property of the
Trust. Accordingly, the Trustees will not be liable for errors of judgment or
mistakes of fact or law, but nothing in the Declaration of Trust protects a
Trustee against any liability to which he would otherwise be subject by reason
of willful misfeasance, bad faith, gross negligence, or reckless disregard of
the duties involved in the conduct of his office.
 
                                       40
<PAGE>
ANTI-TAKEOVER PROVISIONS
 
    The Trust presently has certain anti-takeover provisions in its Declaration
of Trust which could have the effect of limiting the ability of other entities
or persons to acquire control of the Trust, to cause it to engage in certain
transactions or to modify its structure. A Trustee may be removed from office by
a written instrument signed by at least two-thirds of the remaining trustees or
by a vote of the holders of at least 66% of the Shares. In addition, the
affirmative vote or consent of the holders of 66% of the Shares of the Trust (a
greater vote than that required by the 1940 Act and greater than the required
vote applicable to business corporations under state law) is required to
authorize the conversion of the Trust from a closed-end to an open-end
investment company, or generally to authorize any of the following transactions:
 
         (i) merger or consolidation of the Trust with or into any other
    corporation, association, trust or other organization;
 
        (ii) issuance of any securities of the Trust to any person or entity for
    cash;
 
        (iii) sale, lease or exchange of all or any substantial part of the
    assets of the Trust, to any entity or person (except assets having an
    aggregate fair market value of less than $1,000,000, aggregating similar
    transactions over a twelve-month period); or
 
        (iv) sale, lease or exchange to the Trust, in exchange for securities of
    the Trust, of any assets of any entity or person (except assets having an
    aggregate fair market value of less than $1,000,000, aggregating similar
    transactions over a twelve-month period)
 
if such corporation, person or entity is directly, or indirectly through
affiliates, the beneficial owner of 5% or more of the outstanding shares of the
Trust. However, such 66% vote or consent will not be required with respect to
the foregoing transactions where the Board of Trustees under certain conditions
approves the transaction, in which case, with respect to (i) and (iii) above, a
majority shareholder vote or consent will be required, and, with respect to (ii)
and (iv) above, a shareholder vote or consent would be required. Furthermore,
any amendment to the provisions in the Declaration of Trust requiring a 66%
shareholder vote or consent for the foregoing transactions similarly requires a
66% shareholder vote or consent.
 
    The foregoing provisions will make more difficult a change in the Trust's
management, or consummation of the foregoing transactions without the Trustee's
approval, and would, in the event a secondary market were to develop in the
Shares, have the effect of depriving shareholders of an opportunity to sell
their shares at a premium over prevailing market prices by discouraging a third
party from seeking to obtain control of the Trust in a tender offer or similar
transaction. However, the Board of Trustees has considered these anti-takeover
provisions and believes that they are in the shareholders' best interests and
benefit shareholders by providing the advantage of potentially requiring persons
seeking control of the Trust to negotiate with its management regarding the
price to be paid and facilitating the continuity of the Trust's management.
Reference should be made to the Declaration of Trust on file with the SEC for
the full text of these provisions. See "Further Information."
 
                                       41
<PAGE>
SHARE REPURCHASES AND TENDERS
- - --------------------------------------------------------------------------------
 
    The Board of Trustees of the Trust currently intends, each quarter, to
consider authorizing the Trust to make tender offers for all or a portion of its
then outstanding Shares at the then current net asset value of the Shares.
Although such tender offers, if undertaken and completed, will provide some
liquidity for holders of the Shares, there can be no assurance that such tender
offers will in fact be undertaken, completed or, if completed, that they will
provide sufficient liquidity for all holders of Shares who may desire to sell
such Shares. As such, investment in the Shares should be considered illiquid.
 
    Although the Board of Trustees believes that tender offers for the Shares
generally would increase the liquidity of the Shares, the acquisition of Shares
by the Trust will decrease the total assets of the Trust, and therefore, have
the effect of increasing the Trust's expense ratio. Because of the nature of the
Trust's investment objective and policies and the Trust's portfolio, the
Investment Advisor anticipates potential difficulty in disposing of portfolio
securities in order to consummate tender offers for the Shares. As a result, the
Trust may be required to borrow money in order to finance repurchases and
tenders. The Trust's Declaration of Trust authorizes the Trust to borrow money
for such purposes.
 
    Even if a tender offer has been made, the Trustees' announced policy, which
may be changed by the Trustees, is that the Trust cannot accept tenders if (1)
such transactions, if consummated, would (a) impair the Trust's status as a
regulated investment company under the Code (which would make the Trust a
taxable entity, causing the Trust's taxable income to be taxed at the Trust
level) or (b) result in a failure to comply with applicable asset coverage
requirements or (2) there is, in the judgment of the Trustees, any (a) material
legal action or proceeding instituted or threatened challenging such
transactions or otherwise materially adversely affecting the Trust, (b)
suspension of or limitation on prices for trading securities generally on the
New York Stock Exchange, (c) declaration of a banking moratorium by federal or
state authorities or any suspension of payment by banks in the United States or
New York State, (d) limitation affecting the Trust or the issuers of its
portfolio securities imposed by federal or state authorities on the extension of
credit by lending institutions, (e) commencement of war, armed hostilities or
other international or national calamity directly or indirectly involving the
United States or (f) other event or condition which would have a material
adverse effect on the Trust or the holders of its Shares if Shares were
repurchased. The Trustees may modify these conditions in light of experience.
 
    Any tender offer made by the Trust for its Shares will be at a price equal
to the net asset value of the Shares determined at the close of business on the
day the offer ends. During the pendency of any tender offer by the Trust, the
Trust will establish procedures which will be specified in the tender offer
documents to enable holders of Shares to ascertain readily such net asset value.
Each offer will be made and holders of Shares notified in accordance with the
requirements of the 1934 Act and the 1940 Act, either by publication or mailing
or both. Each offering document will contain such information as is prescribed
by such laws and the rules and regulations promulgated thereunder. If any tender
offer, after consideration and approval by the Trustees, is undertaken by the
Trust, the terms of such tender offer will set forth the maximum number of
Shares (if less than all) that the Trust is willing to purchase pursuant to the
tender offer. The Trust will purchase, subject to such maximum number of Shares
tendered in accordance with the terms of the offer, all Shares tendered unless
it determines to accept none of them. In the event that a number of Shares in
excess of such maximum number of outstanding Shares are tendered in accordance
with the Trust's tender offer, the Trust intends to purchase, on a pro rata
basis, an amount
 
                                       42
<PAGE>
of tendered Shares equal to such maximum number of the outstanding Shares or,
alternatively, to extend the offering period and increase the number of Shares
that the Trust is offering to purchase. The Trust will pay all costs and
expenses associated with the making of any tender offer.
 
   
    During the fiscal year October 1, 1997 through September 30, 1998, the Trust
completed four tender offers. The first tender offer commenced on November 19,
1997 and resulted in the tender of 2,396,939 Shares. The second tender offer
commenced on February 18, 1998 and resulted in the tender of 3,069,149 Shares.
The third tender offer commenced on May 15, 1998 and resulted in the tender of
3,164,494 Shares. The fourth tender offer commenced on August 19, 1998 and
resulted in the tender of 4,438,021 shares.
    
 
    If the Trust must liquidate portfolio holdings in order to purchase Shares
tendered, the Trust may realize gains and losses.
 
EARLY WITHDRAWAL CHARGE
 
   
    Any early withdrawal charge to defray distribution expenses will be charged
in connection with Shares held for four years or less (calculated from the last
day of the month in which the Shares were purchased) which are accepted by the
Trust for repurchase pursuant to tender offers, except as noted below. The early
withdrawal charge will be imposed on a number of Shares accepted for tender the
value of which exceeds the aggregate value at the time the tender is accepted of
(a) all Shares in the account purchased more than four years prior to such
acceptance, (b) all Shares in the account acquired through reinvestment of
dividends and distributions, and (c) the increase, if any, of value of all other
Shares in the account (namely those purchased within the four years preceding
the acceptance) over the purchase price of such Shares. Accordingly, the early
withdrawal charge is not imposed on Shares acquired through reinvestment of
dividends and distributions or on any increases in the net asset value of Shares
above the initial purchase price. The early withdrawal charge will be paid to
the Investment Advisor. In determining whether an early withdrawal charge is
payable, it is assumed that the acceptance of a repurchase offer would be made
from the earliest purchase of Shares. Any early withdrawal charge which is
required to be imposed will be made in accordance with the following schedule.
    
 
<TABLE>
<CAPTION>
YEAR OF REPURCHASE                         EARLY WITHDRAWAL
AFTER PURCHASE                                  CHARGE
- - -----------------------------------------  -----------------
<S>                                        <C>
First....................................        3.0%
Second...................................        2.5%
Third....................................        2.0%
Fourth...................................        1.0%
Fifth and following......................        0.0%
</TABLE>
 
   
    The following example will illustrate the operation of the early withdrawal
charge. Assume that an investor purchases $1,000 of the Trust's Shares for cash
and that 21 months later the value of the account has grown through the
reinvestment of dividends and capital appreciation to $1,200. The investor then
may submit for repurchase pursuant to a tender offer up to $200 of Shares
without incurring an early withdrawal charge. If the investor should submit for
repurchase pursuant to a tender offer $500 of Shares, an early withdrawal charge
would be imposed on $300 of the Shares submitted. The charge would be imposed at
the rate of 2.5% because it is in the second year after the purchase was made,
and the charge would be $7.50. For the fiscal years ended September 30, 1996,
1997 and 1998, MSDW Advisors informed the Trust that it received approximately
$728,000, $1,296,000 and $2,085,000, respectively, in withdrawal fees.
    
 
                                       43
<PAGE>
PURCHASE OF SHARES
- - --------------------------------------------------------------------------------
 
    The Trust continuously offers Shares through Morgan Stanley Dean Witter
Distributors Inc., which is acting as the distributor of the Shares, through
certain broker-dealers, including Dean Witter Reynolds Inc. ("DWR"), which have
entered into selected dealer agreements with the Distributor ("Selected
Broker-Dealers"). The Trust or the Distributor may suspend the continuous
offering of the Shares to the general public at any time in response to
conditions in the securities markets or otherwise and may thereafter resume such
offering from time to time.
 
    Morgan Stanley Dean Witter Distributors Inc. serves as distributor of the
Trust's shares pursuant to a Distribution Agreement initially approved by the
Trustees on October 30, 1992. The Distribution Agreement had an initial term
ending April 30, 1994, and provides under its terms that it will continue from
year to year thereafter if approved by the Board. At their meeting held on April
30, 1998, the Trustees, including all of the Independent Trustees, approved the
continuation of the Distribution Agreement until April 30, 1999.
 
    None of the Trust, the Distributor or the Investment Advisor intends to make
a secondary market in the Shares. Accordingly, there is not expected to be any
secondary trading market in the Shares, and an investment in the Shares should
be considered illiquid.
 
    The minimum investment in the Trust is $1,000. Subsequent purchases of $100
or more may be made by sending a check, payable to Morgan Stanley Dean Witter
Prime Income Trust, directly to Morgan Stanley Dean Witter Trust FSB, an
affiliate of the Distributor (the "Transfer Agent") at P.O. Box 1040, Jersey
City, New Jersey 07303 or by contacting a Financial Advisor of DWR or other
Selected Broker-Dealer representative. Certificates for Shares purchased will
not be issued unless a request is made by the shareholder in writing to the
Transfer Agent.
 
    Shares of the Trust are sold through Morgan Stanley Dean Witter Distributors
Inc. or a Selected Broker-Dealer on a normal three business day settlement
basis; that is, payment generally is due on or before the third business day
(settlement date) after the order is placed with the Distributor. Shares of the
Trust purchased through the Distributor or a Selected Broker-Dealer are entitled
to dividends beginning on the next business day following settlement date. Since
the Distributor or a Selected Broker-Dealer forwards investors' funds on
settlement date, they may benefit from the temporary use of the funds where
payment is made prior thereto.
 
    The Shares are offered by the Trust at the then current net asset value per
share next computed after the Distributor receives an order to purchase from an
investor's dealer or directly from the investor. See "Determination of Net Asset
Value." The Investment Advisor compensates the Distributor at a rate of 2.75% of
the purchase price of Shares purchased from the Trust. The Distributor may
reallow to dealers 2.5% of the purchase price of Shares of the Trust purchased
by such dealers. If such Shares remain outstanding after one year from the date
of their initial purchase, the Investment Advisor currently intends to
compensate the Distributor at an annual rate equal to 0.10% of the net asset
value of the Shares sold and remaining outstanding. Such 0.10% fee will begin
accruing after one year from the date of the initial purchase of the Shares. The
compensation to the Distributor described above is paid by the Investment
Advisor from its own assets, which may include profits from the advisory fee
payable under the Advisory Agreement, as well as borrowed funds. An early
withdrawal charge payable to the Investment Advisor of up to 3.0% of the
original purchase price of the Shares will be imposed on most Shares held for
four years or less that are accepted for repurchase pursuant to a tender offer
by the Trust. See
 
                                       44
<PAGE>
"Share Repurchases and Tenders." The compensation paid to the Distributor,
including compensation paid in connection with the purchase of Shares from the
Trust, the annual payments referred to above and the early withdrawal charge, if
any, described above, will not in the aggregate exceed the applicable limit
(currently 7.25%) as determined from time to time by the National Association of
Securities Dealers, Inc.
 
YIELD INFORMATION
- - --------------------------------------------------------------------------------
 
    The Trust may, from time to time, publish its yield. The yield on Trust
Shares normally will fluctuate. Therefore, the yield for any given past period
is not an indication or representation by the Trust of future yields or rates of
return on its Shares. The Trust's yield is affected by changes in prevailing
interest rates, average portfolio maturity and operating expenses. Current yield
information may not provide a basis for comparison with bank deposits or other
investments which pay a fixed yield over a stated period of time.
 
   
    The yield of the Trust is computed by dividing the Trust's net investment
income over a 30-day period by an average value (using the average number of
Shares entitled to receive dividends and the net asset value per Share at the
end of the period), all in accordance with the standardized yield formula
prescribed by the SEC for open-end investment companies. Such amount is
compounded for six months and then annualized for a twelve-month period to
derive the Trust's yield. For the 30-day period ended September 30, 1998, the
Trust's yield, calculated pursuant to this formula, was 6.79%.
    
 
    On occasion, the Trust may compare its yield to (i) the Prime Rate, quoted
daily in THE WALL STREET JOURNAL as the base rate on corporate loans at large
U.S. money center commercial banks, (ii) one or more averages compiled by
DONOGHUE'S MONEY FUND REPORT, a widely recognized independent publication that
monitors the performance of money market mutual funds, (iii) the average yield
reported by the BANK RATE MONITOR NATIONAL INDEX for money market deposit
accounts offered by the 100 leading banks and thrift institutions in the ten
largest standard metropolitan statistical areas, (iv) yield data published by
Lipper Analytical Services, Inc., or (v) the yield on an investment in 90-day
Treasury bills on a rolling basis, assuming quarterly compounding. In addition,
the Trust may compare the Prime Rate, the DONOGHUE'S averages and the other
yield data described above to each other. As with yield quotations, yield
comparisons should not be considered representative of the Trust's yield or
relative performance for any future period.
 
CUSTODIAN, DIVIDEND DISBURSING AND TRANSFER AGENT
- - --------------------------------------------------------------------------------
 
    The Bank of New York, 90 Washington Street, New York, New York 10286, is the
Trust's custodian and has custody of all securities and cash of the Trust. The
custodian, among other things, attends to the collection of principal and income
and payment for collection of proceeds of securities bought and sold by the
Trust. Any of the Trust's cash balances with the Custodian in excess of $100,000
are unprotected by federal deposit insurance. Such balances may, at times, be
substantial.
 
    Morgan Stanley Dean Witter Trust FSB, Harborside Financial Center, Plaza
Two, Jersey City, New Jersey 07311, an affiliate of Morgan Stanley Dean Witter
Advisors Inc., the Trust's Investment Advisor, Morgan Stanley Dean Witter
Services Company Inc., the Trust's Administrator and Morgan Stanley Dean Witter
Distributors Inc. ("MSDW Distributors"), the Trust's Distributor, is the
dividend disbursing and transfer agent of the Trust. Morgan Stanley Dean Witter
Trust FSB charges the Trust an annual per shareholder account fee.
 
                                       45
<PAGE>
REPORTS TO SHAREHOLDERS
- - --------------------------------------------------------------------------------
 
    The Trust will send to shareholders semi-annual reports showing the Trust's
portfolio and other information. An annual report, containing financial
statements audited by independent accountants, together with their report
thereon, will be sent to shareholders each year.
 
LEGAL COUNSEL
- - --------------------------------------------------------------------------------
 
    Barry Fink, Esq., who is an officer and the General Counsel of the
Investment Advisor, is an officer and the General Counsel of the Trust.
 
EXPERTS
- - --------------------------------------------------------------------------------
 
   
    The September 30, 1998 financial statements of the Trust, included herein,
have been so included in reliance upon the report of PricewaterhouseCoopers LLP,
independent accountants, given on the authority of said firm as experts in
auditing and accounting.
    
 
ADDITIONAL INFORMATION
- - --------------------------------------------------------------------------------
 
CODE OF ETHICS
 
    Directors, officers and employees of MSDW Advisors, MSDW Services and MSDW
Distributors are subject to a strict Code of Ethics adopted by those companies.
The Code of Ethics is intended to ensure that the interests of shareholders and
other clients are placed ahead of any personal interest, that no undue personal
benefit is obtained from a person's employment activities and that actual and
potential conflicts of interest are avoided. To achieve these goals and comply
with regulatory requirements, the Code of Ethics requires, among other things,
that personal securities transactions by employees of the companies be subject
to an advance clearance process to monitor that no Morgan Stanley Dean Witter
Fund is engaged at the same time in a purchase or sale of the same security. The
Code of Ethics bans the purchase of securities in an initial public offering,
and also prohibits engaging in futures and options transactions and profiting on
short-term trading (that is, a purchase within sixty days of a sale or a sales
within sixty days of a purchase) of a security. In addition, investment
personnel may not purchase or sell a security for their personal account within
thirty days before or after any transaction in any Morgan Stanley Dean Witter
Fund managed by them. Any violations of the Code of Ethics are subject to
sanctions, including reprimand, demotion or suspension or termination of
employment. The Code of Ethics comports with regulatory requirements and the
recommendations in the 1994 report by the Investment Company Institute Advisory
Group on Personal Investing.
 
SHAREHOLDER INQUIRIES
 
    All inquiries regarding the Trust should be directed to the Trust at the
telephone number or address set forth on the front cover of this Prospectus.
 
    This Prospectus does not contain all of the information set forth in the
Registration Statement that the Trust has filed with the SEC. The complete
Registration Statement may be obtained from the SEC upon payment of the fee
prescribed by the Rules and Regulations of the SEC.
 
                                       46
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
REPORT OF INDEPENDENT ACCOUNTANTS
    
 
   
TO THE SHAREHOLDERS AND TRUSTEES
OF MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
 
   
In our opinion, the accompanying statement of assets and liabilities, including
the portfolio of investments, and the related statements of operations, of
changes in net assets and of cash flows and the financial highlights present
fairly, in all material respects, the financial position of Morgan Stanley Dean
Witter Prime Income Trust (the "Trust"), formerly Prime Income Trust, at
September 30, 1998, the results of its operations and its cash flows 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 eight years in
the period then ended and for the period November 30, 1989 (commencement of
operations) through September 30, 1990, in conformity with generally accepted
accounting principles. These financial statements and financial highlights
(hereafter referred to as "financial statements") are the responsibility of the
Trust's management; our responsibility is to express an opinion on these
financial statements based on our audits. We conducted our audits of these
financial statements in accordance with generally accepted auditing standards
which require that we plan and perform the audit to obtain reasonable assurance
about whether the financial statements are free of material misstatement. An
audit 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, and evaluating the overall
financial statement presentation. We believe that our audits, which included
confirmation of securities at September 30, 1998 by correspondence with the
custodian and, with respect to senior collateralized loans, the selling
participants and agent banks, provide a reasonable basis for the opinion
expressed above.
    
 
   
PricewaterhouseCoopers LLP
    
   
1177 AVENUE OF THE AMERICAS
    
   
NEW YORK, NEW YORK 10036
NOVEMBER 2, 1998
    
 
                                       47
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998
    
 
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
               SENIOR COLLATERIZED TERM LOANS (a)(b) (88.4%)
               ACCIDENT & HEALTH INSURANCE (0.2%)
$     2,500    BRW Acquisition Inc...............................      8.19%            07/10/06   $     2,500,475
      2,500    BRW Acquisition Inc...............................       8.44            07/10/07         2,500,475
                                                                                                   ---------------
                                                                                                         5,000,950
                                                                                                   ---------------
               AEROSPACE (1.1%)
     11,250    Fairchild Holding Corp............................   8.63 to 8.69        06/18/04        11,251,744
      9,800    Tri-Star Aerospace Co.............................       7.75            09/30/03         9,802,744
                                                                                                   ---------------
                                                                                                        21,054,488
                                                                                                   ---------------
               AIR FREIGHT/DELIVERY SERVICES (1.2%)
      8,480    Atlas Freighter Leasing II, Inc...................       7.91            05/29/04         8,482,936
      5,063    Evergreen International Aviation, Inc.............       8.69            05/31/02         5,062,703
      9,649    First Security Bank, National Association as Owner
                 Trustee.........................................       8.69            05/07/03         9,651,107
                                                                                                   ---------------
                                                                                                        23,196,746
                                                                                                   ---------------
               AIRCRAFT & AEROSPACE (1.8%)
      8,619    Erickson Air-Crane Co., L.L.C.....................  9.13 to 10.50        12/31/04         8,619,440
     14,963    Nortek Aviation Support Inc.......................   8.75 to 8.81        07/01/05        14,965,448
     11,796    Western Sky Industries Inc........................       8.04            07/31/03        11,797,780
                                                                                                   ---------------
                                                                                                        35,382,668
                                                                                                   ---------------
               APPAREL (0.1%)
      1,613    London Fog Industries, Inc. (c)...................      10.00            02/27/03         1,613,132
                                                                                                   ---------------
               AUTO PARTS (0.9%)
     18,000    Federal Mogul Corp................................   7.82 to 7.88        12/31/05        18,001,674
                                                                                                   ---------------
               AUTO PARTS - ORIGINAL EQUIPMENT (1.8%)
     10,000    Accuride Corp.....................................       7.69            01/21/06        10,001,200
     10,000    American Axle & Manufacturing, Inc................       8.19            04/30/06        10,001,700
     15,501    AP Automotive Systems, Inc........................   8.50 to 8.69        12/19/05        15,506,510
                                                                                                   ---------------
                                                                                                        35,509,410
                                                                                                   ---------------
               AUTOMOTIVE AFTERMARKET (0.6%)
     12,564    CSK Auto, Inc.....................................   7.44 to 9.25        10/31/03        12,567,139
                                                                                                   ---------------
               BREWERS (0.9%)
      3,317    The Stroh Brewery Co..............................       8.56            06/30/01         3,317,868
      2,505    The Stroh Brewery Co. (Revolver)..................       8.63            06/30/01         2,505,076
     12,508    The Stroh Brewery Co..............................       9.06            06/30/03        12,512,477
                                                                                                   ---------------
                                                                                                        18,335,421
                                                                                                   ---------------
               BROADCASTING (0.6%)
     12,391    Latin Communications, Inc.........................      13.25            02/28/04        12,391,305
                                                                                                   ---------------
</TABLE>
    
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       48
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED
    
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
               BROADCAST MEDIA (3.3%)
$    10,000    Black Entertainment Television Inc................      7.69%            06/30/06   $    10,002,800
     19,950    Capstar Media Broadcasting Partners...............       8.13            05/31/05        19,951,397
      6,400    Chancellor Media Corp.............................       6.25            06/30/05         6,400,551
      1,288    Chancellor Media Corp. (Revolver).................   6.25 to 8.50        06/30/05         1,288,156
     20,000    Sinclair Broadcast Group..........................   7.16 to 7.20        09/15/05        20,000,399
      7,500    Spartan Communications, Inc.......................       8.95            06/30/05         7,500,000
                                                                                                   ---------------
                                                                                                        65,143,303
                                                                                                   ---------------
               BUILDING MATERIALS (0.8%)
      6,000    Dayton Superior Corp..............................       8.44            09/29/05         6,002,520
      9,943    Falcon Building Products, Inc.....................       8.38            06/30/05         9,943,155
                                                                                                   ---------------
                                                                                                        15,945,675
                                                                                                   ---------------
               BUSINESS PUBLISHING (0.9%)
     18,981    Advanstar Communications, Inc.....................       7.88            04/30/05        18,981,569
                                                                                                   ---------------
               BUSINESS SERVICES (1.8%)
      5,000    Bridge Information Systems........................       8.44            05/29/03         5,000,150
     15,000    Bridge Information Systems........................       8.69            05/29/05        15,000,351
     15,000    United Rentals Inc................................       7.56            06/30/05        15,001,200
                                                                                                   ---------------
                                                                                                        35,001,701
                                                                                                   ---------------
               CABLE TELEVISION (1.7%)
      5,895    Cable Systems International,
                 Inc.............................................       8.69            12/31/02         5,895,059
      9,975    Charter Communications Entertainment I, L.P.......  8.38 to 10.00        12/31/04         9,975,200
      8,499    Falcon Cable Communications.......................   7.31 to 7.70        12/31/07         8,501,888
      9,564    Supercanal Holdings S.A. (Argentina) (c)..........      10.13            10/12/02         9,567,962
                                                                                                   ---------------
                                                                                                        33,940,109
                                                                                                   ---------------
               CHEMICALS - DIVERSIFIED (0.5%)
      3,846    Lyondell Petrochemical Co.........................       7.53            06/30/99         3,817,731
      6,154    Lyondell Petrochemical Co.........................       7.69            06/30/00         6,109,477
                                                                                                   ---------------
                                                                                                         9,927,208
                                                                                                   ---------------
               COAL MINING (1.7%)
      6,487    Alliance Coal Corp................................       8.57            12/31/02         6,487,302
     13,385    P&L Coal Holdings Corp............................   7.88 to 8.13        06/30/06        13,391,486
     14,963    Quaker Coal Company Inc...........................       8.84            06/30/06        14,971,178
                                                                                                   ---------------
                                                                                                        34,849,966
                                                                                                   ---------------
               COMMUNICATIONS - EQUIPMENT & SOFTWARE (1.3%)
      5,001    Channel Master, Inc...............................       8.69            10/10/05         5,000,349
      4,964    Dynatech Corp.....................................   7.81 to 9.75        03/31/05         4,964,680
</TABLE>
    
 
   
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       49
    
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED
    
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
$     4,964    Dynatech Corp.....................................  8.06 to 10.00%       03/31/06   $     4,964,680
      4,964    Dynatech Corp.....................................  8.31 to 10.25        03/31/07         4,964,680
      5,965    Telex Communications, Inc.........................       8.69            11/06/04         5,967,413
                                                                                                   ---------------
                                                                                                        25,861,802
                                                                                                   ---------------
               COMPUTERS - SERVICES (0.7%)
     14,851    DecisionOne Corp..................................   8.32 to 8.82        08/07/04        14,858,113
                                                                                                   ---------------
               CONSUMER SPECIALITIES (1.2%)
      8,391    Amscan Holdings, Inc..............................   7.69 to 7.88        12/31/04         8,394,751
      6,710    Renters Choice Inc................................       8.13            01/31/06         6,710,157
      8,201    Renters Choice Inc................................       8.38            01/31/07         8,201,122
                                                                                                   ---------------
                                                                                                        23,306,030
                                                                                                   ---------------
               CONSUMER SUNDRIES (1.6%)
      6,602    Chattem, Inc......................................       8.88            02/14/04         6,602,395
        308    Corning Consumer Products Co......................   7.28 to 7.38        04/09/05           309,126
     16,000    Corning Consumer Products Co......................       7.53            10/09/06        16,001,920
      9,212    The Boyds Collection, Ltd.........................   7.75 to 7.94        04/21/06         9,212,844
                                                                                                   ---------------
                                                                                                        32,126,285
                                                                                                   ---------------
               CONTAINERS/PACKAGING (0.9%)
      5,432    Graham Packaging Co...............................       8.13            01/31/06         5,432,455
      7,394    Graham Packaging Co...............................   8.38 to 8.56        01/31/07         7,394,410
      4,786    MPC Packaging Corp................................       8.06            05/30/04         4,786,687
                                                                                                   ---------------
                                                                                                        17,613,552
                                                                                                   ---------------
               CONVENIENCE STORES (0.6%)
      4,950    Caribbean Petroleum, L.P..........................       8.63            09/30/05         4,950,149
      7,009    Cumberland Farms, Inc. (Participation Merrill
                 Lynch & Co., Inc.) (d)..........................       9.00            12/31/98         7,009,096
                                                                                                   ---------------
                                                                                                        11,959,245
                                                                                                   ---------------
               DEPARTMENT STORES (0.6%)
     12,500    Tuesday Morning Corp..............................       8.68            12/29/04        12,500,750
                                                                                                   ---------------
               DIVERSIFIED MANUFACTURING (0.4%)
      4,020    Werner Holding Co., Inc...........................       8.25            11/30/04         4,025,654
      4,913    Werner Holding Co., Inc...........................       8.50            11/30/05         4,920,146
                                                                                                   ---------------
                                                                                                         8,945,800
                                                                                                   ---------------
               DRUG STORE CHAIN (0.6%)
      9,950    Duane Reade, Inc..................................       8.38            02/13/05         9,950,697
      1,250    Duane Reade, Inc..................................       8.38            02/15/06         1,250,113
                                                                                                   ---------------
                                                                                                        11,200,810
                                                                                                   ---------------
               EDUCATION (0.5%)
      9,352    Childrens Discovery Centers of America............      10.63            06/30/05         9,351,563
                                                                                                   ---------------
</TABLE>
    
 
   
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       50
    
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED
    
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
               ELECTRIC UTILITIES (0.7%)
$    15,000    AES Edelap Funding Co.............................      8.13%            06/29/99   $    15,000,900
                                                                                                   ---------------
               FINANCE (3.5%)
     13,000    Blackstone Capital Company II, L.L.C..............       9.06            05/31/99        13,001,820
     36,750    Mafco Holdings, Inc...............................       9.22            04/28/00        36,757,718
      7,403    Mafco Finance Corp. (Revolver)....................  8.88 to 11.00        04/28/00         7,402,996
     13,000    Wasserstein/C & A Holdings, L.L.C.................       9.00            05/31/99        13,005,200
                                                                                                   ---------------
                                                                                                        70,167,734
                                                                                                   ---------------
               FOOD DISTRIBUTORS (0.6%)
     12,500    Leon's Bakery, Inc................................       8.63            06/03/05        12,506,375
                                                                                                   ---------------
               FOOD SERVICES (0.5%)
      6,588    Volume - Services, Inc............................       8.75            12/31/02         6,590,440
      3,294    Volume - Services, Inc............................       9.25            12/31/03         3,295,004
                                                                                                   ---------------
                                                                                                         9,885,444
                                                                                                   ---------------
               FOODS & BEVERAGES (1.9%)
      7,467    Eagle Family Foods, Inc...........................       7.57            12/31/05         7,468,604
      8,472    Favorite Brands International,
                 Inc.............................................       8.50            05/19/05         8,475,140
      9,975    Formax Inc........................................       8.44            06/30/05         9,975,299
     11,080    Specialty Foods Corp..............................       9.50            01/31/00        11,080,978
                                                                                                   ---------------
                                                                                                        37,000,021
                                                                                                   ---------------
               FUNERAL SERVICES (1.0%)
      4,889    Prime Succession, Inc.............................   8.44 to 8.50        08/01/03         4,891,517
      4,889    Prime Succession, Inc. (Participation: Goldman
                 Sachs & Co.) (d)................................   8.44 to 8.50        08/01/03         4,891,517
      9,734    Rose Hills Co.....................................   8.44 to 8.56        12/01/03         9,740,857
                                                                                                   ---------------
                                                                                                        19,523,891
                                                                                                   ---------------
               GAS - TRUCK STOP (0.3%)
      6,457    Petro Stopping Centers, L.P.......................       8.31            09/30/03         6,457,943
                                                                                                   ---------------
               GLASS - PRODUCTS (0.2%)
      2,500    Safelite Glass Corp...............................       7.35            12/23/04         2,500,225
      2,500    Safelite Glass Corp...............................       7.60            12/23/05         2,500,225
                                                                                                   ---------------
                                                                                                         5,000,450
                                                                                                   ---------------
               HEALTH CARE DIVERSIFIED (1.3%)
     17,500    Integrated Health Service, Inc....................       7.44            12/31/04        17,506,300
      4,000    Magellan Health Services, Inc.....................       8.09            02/12/05         4,000,560
</TABLE>
    
 
   
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       51
    
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED
    
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
$     4,000    Magellan Health Services, Inc.....................      8.34%            02/12/06   $     4,000,560
                                                                                                   ---------------
                                                                                                        25,507,420
                                                                                                   ---------------
               HOSPITAL/NURSING MANAGEMENT (3.6%)
      7,123    Community Health Systems,
                 Inc.............................................       8.38            12/31/03         7,123,501
      7,123    Community Health Systems,
                 Inc.............................................       8.88            12/31/04         7,123,501
      5,342    Community Health Systems,
                 Inc.............................................       9.13            12/31/05         5,342,626
      4,455    GEAC/Multicare Co., Inc...........................   8.22 to 8.41        09/30/04         4,456,096
      1,481    GEAC/Multicare Co., Inc...........................       8.69            06/01/05         1,481,813
      5,459    Genesis Health Ventures, Inc......................   8.31 to 8.44        09/30/04         5,459,650
      5,445    Genesis Health Ventures, Inc......................   8.56 to 8.69        06/01/05         5,445,904
      5,353    Paracelsus Healthcare Corp........................       7.84            03/31/03         5,353,762
      8,000    Paracelsus Healthcare Corp........................       8.09            03/31/04         8,000,640
     21,167    Ventas Bridge Loan................................       8.34            10/30/99        21,168,572
                                                                                                   ---------------
                                                                                                        70,956,065
                                                                                                   ---------------
               HOTELS/RESORTS (4.2%)
     20,000    Florida Panthers Holdings, Inc....................       8.75            12/15/98        20,006,400
     10,500    Meristar Hospitality Operating Partners...........       7.69            01/31/04        10,502,625
      3,529    Patriot American Hospitality
                 Inc.............................................       7.99            03/31/99         3,530,859
      3,971    Patriot American Hospitality
                 Inc.............................................       7.99            03/31/00         3,972,216
     14,994    Patriot American Hospitality
                 Inc.............................................   8.24 to 9.25        03/31/03        14,999,595
      2,892    Premier Parks Inc.................................       8.00            03/31/06         2,892,470
      8,608    Six Flag Theme Parks, Inc.........................       8.50            11/30/04         8,607,990
     20,000    Starwood Hotels & Resorts Worldwide, Inc..........       8.34            02/23/03        20,002,800
                                                                                                   ---------------
                                                                                                        84,514,955
                                                                                                   ---------------
               HOUSEHOLD APPLIANCES (0.7%)
     14,925    Coinmach Corp.....................................       8.06            06/30/05        14,926,194
                                                                                                   ---------------
               HOUSEHOLD FURNISHINGS & APPLIANCES (1.1%)
     13,941    Pillowtex Corp....................................   7.82 to 7.94        12/31/04        13,943,693
      3,019    Sealy Mattress Co.................................       8.25            12/15/04         3,020,964
      2,175    Sealy Mattress Co.................................       8.50            12/15/05         2,175,633
      2,779    Sealy Mattress Co.................................       8.75            12/15/06         2,780,094
                                                                                                   ---------------
                                                                                                        21,920,384
                                                                                                   ---------------
               INSURANCE BROKERS/SERVICES (0.4%)
      7,363    Acordia, Inc......................................       8.13            12/31/04         7,363,221
                                                                                                   ---------------
</TABLE>
    
 
   
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       52
    
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED
    
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
               MANUFACTURER CONSUMER & INDUSTRIAL PRODUCTS (0.7%)
$    15,000    Hexcel Corp.......................................      7.63%            09/14/05   $    15,000,900
                                                                                                   ---------------
               MANUFACTURING (2.0%)
      5,672    Alliance Gaming Corp..............................   8.44 to 8.56        01/31/05         5,677,777
      2,263    Alliance Gaming Corp..............................   8.75 to 8.81        07/31/05         2,265,157
      7,564    Arena Brands, Inc.................................   8.88 to 9.38        06/01/02         7,567,617
        601    Arena Brands, Inc (Revolver)......................  8.88 to 10.75        06/01/02           601,202
      6,647    Chatham Technologies, Inc.........................       8.13            08/18/03         6,647,372
      7,939    Chatham Technologies, Inc.........................       8.63            08/18/05         7,939,152
      9,895    Desa International, Inc...........................   8.31 to 8.38        11/26/04         9,901,465
                                                                                                   ---------------
                                                                                                        40,599,742
                                                                                                   ---------------
               MANUFACTURING - APPAREL (1.1%)
     15,000    Sun Apparel, Inc..................................       8.13            09/30/04        15,001,050
      6,111    The William Carter Co.............................   8.16 to 8.25        10/30/03         6,113,507
                                                                                                   ---------------
                                                                                                        21,114,557
                                                                                                   ---------------
               MANUFACTURING - DIVERSIFIED INDUSTRIES (1.9%)
      8,042    Adience, Inc. and Refraco Holdings, Ltd...........       8.56            04/15/05         8,042,036
      1,990    Adience, Inc. and Refraco Holdings, Ltd...........       8.81            07/30/05         1,990,159
     10,857    Adience, Inc. and Refraco Holdings, Ltd...........       9.31            10/15/05        10,858,446
      6,930    Doskocil Manufacturing Co.........................       8.13            09/30/04         6,930,208
      3,700    Eagle-Picher Industries, Inc......................       8.16            08/31/05         3,700,444
      5,550    Eagle-Picher Industries, Inc......................       8.41            08/31/06         5,550,666
                                                                                                   ---------------
                                                                                                        37,071,959
                                                                                                   ---------------
               MEDICAL ELECTRONICS (0.5%)
      2,455    Medical Specialties Group, Inc....................  8.88 to 11.00        06/30/01         2,454,617
      7,136    Medical Specialties Group, Inc....................  9.63 to 11.75        06/30/04         7,136,577
                                                                                                   ---------------
                                                                                                         9,591,194
                                                                                                   ---------------
               MEDICAL SPECIALTIES (1.0%)
      3,044    Alaris Medical Systems, Inc.......................       8.19            11/01/03         3,044,145
      3,044    Alaris Medical Systems, Inc.......................       8.19            11/01/04         3,044,145
      4,782    Alaris Medical Systems, Inc.......................   8.06 to 8.19        05/01/05         4,783,241
      2,942    Dade International, Inc...........................   7.69 to 7.75        12/31/02         2,942,502
      2,942    Dade International, Inc...........................   7.69 to 7.75        12/31/03         2,942,608
      2,643    Dade International, Inc...........................       7.69            12/31/04         2,644,038
                                                                                                   ---------------
                                                                                                        19,400,679
                                                                                                   ---------------
               MEDICAL/NURSING SERVICES (2.3%)
      1,985    Alliance Imaging, Inc.............................   8.04 to 8.25        12/18/03         1,986,057
      4,963    Alliance Imaging, Inc.............................       8.07            06/18/04         4,964,932
      8,412    Alliance Imaging, Inc.............................       9.75            12/18/04         8,411,765
</TABLE>
    
 
   
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       53
    
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED
    
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
$     3,741    FHC Health System Inc.............................      8.09%            04/30/05   $     3,741,186
      3,741    FHC Health System Inc.............................       8.34            04/30/06         3,741,186
      9,818    Interim Healthcare, Inc...........................       8.44            02/29/04         9,818,594
      3,670    Interim Healthcare, Inc...........................       8.69            02/28/05         3,670,040
      9,900    SMT Health Services, Inc..........................   8.13 to 8.31        08/31/03         9,900,687
                                                                                                   ---------------
                                                                                                        46,234,447
                                                                                                   ---------------
               MOTOR VEHICLE (0.2%)
      4,250    Asbury Automotive Texas Holdings..................       9.44            03/31/05         4,250,085
                                                                                                   ---------------
               MOVIES/ENTERTAINMENT (1.9%)
      7,500    MGM Studios, Inc..................................       8.19            03/31/06         7,502,775
     10,000    Panavision Inc....................................   8.13 to 8.25        03/31/05        10,004,140
      2,353    Regal Cinemas Inc.................................       7.88            05/27/06         2,354,024
      2,647    Regal Cinemas Inc.................................       8.13            05/27/07         2,648,250
      6,000    United Artists Theatre Co.........................   8.31 to 8.38        04/21/06         6,007,052
      9,000    United Artists Theatre Co.........................   8.56 to 8.63        04/21/07         9,010,577
                                                                                                   ---------------
                                                                                                        37,526,818
                                                                                                   ---------------
               NEWSPAPERS (0.2%)
      4,975    21st Century Newspapers, Inc......................       7.88            09/15/05         4,975,149
                                                                                                   ---------------
               OFFICE EQUIPMENT & SUPPLIES (1.0%)
     20,000    US Office Products Co.............................       8.19            06/09/06        20,001,400
                                                                                                   ---------------
               OIL RELATED (1.3%)
     15,000    Plains All American Inc...........................       8.69            06/30/05        15,002,700
     10,000    US Synthetic Corp.................................       8.53            05/31/05        10,024,810
                                                                                                   ---------------
                                                                                                        25,027,510
                                                                                                   ---------------
               OTHER METALS/MINERALS (1.2%)
      8,978    Calciner Industries Inc...........................   8.76 to 8.83        06/25/08         8,988,441
     15,000    U.S. Silica Corp..................................       8.13            06/30/06        15,000,750
                                                                                                   ---------------
                                                                                                        23,989,191
                                                                                                   ---------------
               PACKAGED FOODS (0.2%)
      3,492    Southern Foods Group, L.P.........................   8.44 to 8.63        03/04/06         3,492,684
                                                                                                   ---------------
               PAPER (2.2%)
     12,405    Alabama Pine Pulp Co., Inc. (e)...................      10.25            12/31/02        10,544,581
      9,262    Alabama River Newsprint Co. (Participation:
                 Toronto Dominion Bank) (d)......................   7.38 to 7.63        12/31/02         8,675,748
      9,925    Bear Island Paper Co., L.L.C......................       8.59            12/31/05         9,929,367
      2,828    Crown Paper Co. (Revolver)........................   8.25 to 8.38        08/22/02         2,829,908
      1,285    Crown Paper Co. (Revolver)........................  8.25 to 10.00        08/22/02         1,285,995
      9,715    Crown Paper Co....................................   9.00 to 9.13        08/22/03         9,722,893
                                                                                                   ---------------
                                                                                                        42,988,492
                                                                                                   ---------------
</TABLE>
    
 
   
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       54
    
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED
    
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
               PHARMACEUTICALS (0.2%)
$     4,988    Roberts Pharmaceuticals Corp......................      7.81%            06/30/03   $     4,987,899
                                                                                                   ---------------
               PHOTOGRAPHY - IMAGING (0.4%)
      8,000    PCA International Inc.............................   8.41 to 8.44        08/25/05         8,002,240
                                                                                                   ---------------
               PLASTICS (0.8%)
      7,649    Jet Plastica Industries, Inc......................   8.00 to 8.19        12/31/02         7,648,947
      9,005    Jet Plastica Industries, Inc......................       8.50            12/31/04         9,005,676
                                                                                                   ---------------
                                                                                                        16,654,623
                                                                                                   ---------------
               PRINTED CIRCUIT BOARDS (0.8%)
      9,000    Details, Inc......................................       8.04            04/22/05         9,001,080
      2,989    Viasystems Group, Inc.............................       8.35            03/31/04         2,990,721
      2,466    Viasystems Group, Inc.............................       8.69            06/30/04         2,466,624
      1,500    Viasystems Group, Inc.............................       9.19            06/30/05         1,500,405
                                                                                                   ---------------
                                                                                                        15,958,830
                                                                                                   ---------------
               PUBLISHING (3.5%)
     10,931    Cygnus Publishing, Inc............................       8.44            06/05/05        10,936,060
      8,880    HMV Media Group PLC...............................       8.34            02/25/06         8,884,174
      6,120    HMV Media Group PLC...............................       8.84            08/25/06         6,122,815
      9,975    The Sheridan Group, Inc...........................       8.69            01/30/05         9,975,599
      3,327    Von Hoffman Press, Inc............................       7.56            05/30/04         3,327,052
     10,801    Von Hoffman Press, Inc............................       7.56            05/30/05        10,801,757
     20,000    Ziff Davis Inc....................................       7.44            03/31/06        20,006,000
                                                                                                   ---------------
                                                                                                        70,053,457
                                                                                                   ---------------
               RAILROADS (0.2%)
      4,000    Transportacion Ferroviaria Mexicana, S.A. de
                 C.V.............................................       9.69            12/23/02         4,000,160
                                                                                                   ---------------
               RECREATIONAL PRODUCTS/TOYS (0.7%)
      7,210    Ritvik Toys, Inc..................................       9.19            02/08/03         7,211,443
      7,210    Ritvik Toys, Inc..................................       9.69            02/08/04         7,211,298
                                                                                                   ---------------
                                                                                                        14,422,741
                                                                                                   ---------------
               RESTAURANTS (0.5%)
      9,238    Shoney's, Inc.....................................  8.85 to 10.75        04/30/02         9,240,915
                                                                                                   ---------------
               SCIENTIFIC INSTRUMENTS (0.3%)
      3,192    Fisher Scientific International,
                 Inc.............................................       8.19            01/21/05         3,192,013
      2,209    Fisher Scientific International,
                 Inc.............................................       8.44            10/21/05         2,208,873
                                                                                                   ---------------
                                                                                                         5,400,886
                                                                                                   ---------------
               SEMICONDUCTORS (1.0%)
     17,028    Fairchild Semiconductor Corp......................   8.07 to 8.19        03/11/03        17,028,692
      3,965    Mitel Corp........................................       7.75            12/26/03         3,966,996
                                                                                                   ---------------
                                                                                                        20,995,688
                                                                                                   ---------------
</TABLE>
    
 
   
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       55
    
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED
    
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
               SOFT DRINKS (0.9%)
$     8,581    Snapple/Mistic Beverages, Inc.....................      8.63%            06/01/04   $     8,585,035
      8,581    Snapple/Mistic Beverages, Inc.....................       8.88            06/01/05         8,585,485
                                                                                                   ---------------
                                                                                                        17,170,520
                                                                                                   ---------------
               SPECIALTY CHEMICALS (1.6%)
      3,850    Huntsman Speciality Chemicals Corp................       7.81            03/15/04         3,850,308
      3,850    Huntsman Speciality Chemicals Corp................       8.06            03/15/05         3,850,308
      6,913    Pioneer America Acquitions Corp...................   7.82 to 8.25        12/05/06         6,923,820
      8,200    Pioneer Americas, Inc.............................   8.63 to 8.82        12/05/06         8,206,437
      8,160    Vining Industries Inc.............................   8.25 to 8.32        03/31/05         8,161,322
                                                                                                   ---------------
                                                                                                        30,992,195
                                                                                                   ---------------
               SPECIALTY STEEL (1.0%)
      9,975    ISPAT Inland L.P..................................       7.63            07/16/05         9,975,299
      9,975    ISPAT Inland L.P..................................       8.13            07/16/06         9,975,299
                                                                                                   ---------------
                                                                                                        19,950,598
                                                                                                   ---------------
               SPORTING GOODS (0.7%)
        913    E & S Holdings Corp...............................       8.08            09/30/03           912,835
      2,875    E & S Holdings Corp. (Revolver)...................  8.02 to 10.00        09/30/03         2,875,513
      1,828    E & S Holdings Corp...............................  8.58 to 10.50        09/30/04         1,827,933
      1,828    E & S Holdings Corp...............................  9.08 to 11.00        09/30/05         1,827,933
      1,052    E & S Holdings Corp...............................       9.58            09/30/06         1,052,397
        723    Worldwide Sports & Recreation, Inc................       8.31            04/26/00           722,455
      4,903    Worldwide Sports & Recreation, Inc................       8.81            04/26/01         4,903,706
                                                                                                   ---------------
                                                                                                        14,122,772
                                                                                                   ---------------
               SUPERMARKETS (0.4%)
      3,110    Star Markets Company, Inc.........................       8.69            12/31/01         3,110,811
      2,329    Star Markets Company, Inc.........................       9.19            12/31/02         2,330,163
      2,064    Star Markets Company, Inc.........................       9.19            12/31/03         2,064,926
                                                                                                   ---------------
                                                                                                         7,505,900
                                                                                                   ---------------
               TELECOMMUNICATIONS (0.2%)
        994    MJD Communications, Inc...........................       8.06            03/31/06           993,746
      3,980    MJD Communications, Inc...........................  8.31 to 10.25        03/31/07         3,980,313
                                                                                                   ---------------
                                                                                                         4,974,059
                                                                                                   ---------------
               TELEPHONE - LONG DISTANCE (0.5%)
      9,925    Access Communications & S.J. Investments, Inc.....  8.50 to 10.50        12/31/04         9,927,000
                                                                                                   ---------------
</TABLE>
    
 
   
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       56
    
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED
    
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
               TEXTILES (1.1%)
$     8,000    Globe Manufacturing Inc...........................  8.44 to 8.50%        07/31/06   $     8,005,993
      4,566    Joan Fabrics Corp.................................       8.38            06/30/05         4,566,436
      2,372    Joan Fabrics Corp.................................       8.88            06/30/06         2,372,543
      6,972    Polymer Group, Inc................................       8.10            12/20/05         6,972,558
                                                                                                   ---------------
                                                                                                        21,917,530
                                                                                                   ---------------
               TRANSPORTATION - SHIPPING (1.1%)
      6,342    American Commercial Lines LLC.....................       8.19            06/30/06         6,342,010
      8,641    American Commercial Lines LLC.....................       8.44            06/30/07         8,641,364
      7,463    North American Van Lines, Inc.....................       8.07            03/31/06         7,462,575
                                                                                                   ---------------
                                                                                                        22,445,949
                                                                                                   ---------------
               TRUCKING (0.5%)
      5,371    MTL Inc...........................................   7.56 to 7.63        08/28/05         5,371,537
      4,604    MTL Inc...........................................   7.81 to 7.88        02/28/06         4,604,174
                                                                                                   ---------------
                                                                                                         9,975,711
                                                                                                   ---------------
               WHOLESALE DISTRIBUTOR (1.3%)
     14,613    American Marketing Industries, Inc................       9.19            11/29/02        14,619,386
      3,940    American Marketing Industries, Inc................   9.19 to 9.25        11/30/03         3,941,307
      2,736    American Marketing Industries, Inc................   9.19 to 9.25        11/30/04         2,737,083
      4,229    American Marketing Industries, Inc................   9.19 to 9.25        11/30/05         4,230,057
                                                                                                   ---------------
                                                                                                        25,527,833
                                                                                                   ---------------
               WIRE & CABLE (0.6%)
     12,899    International Wire Group, Inc.....................   7.50 to 9.50        09/30/03        12,903,313
                                                                                                   ---------------
               WIRELESS COMMUNICATION (4.1%)
     13,684    Arch Paging Inc...................................       9.00            06/30/06        13,684,760
     17,500    CCPR Services Inc.................................       8.19            06/30/06        17,505,425
      6,821    Mobilemedia Communications Corp...................       8.19            06/30/02         6,822,164
      1,341    Mobilemedia Communications Corp. (Revolver).......       8.19            06/30/02         1,341,074
      1,846    Mobilemedia Communications Corp...................       8.69            06/30/03         1,846,102
     20,000    Nextel Finance Co.................................       8.38            09/30/06        20,001,600
     11,001    Powertel PCS, Inc.................................       8.31            12/31/08        11,000,879
</TABLE>
    
 
   
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       57
    
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED
    
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
$    10,000    Sprint Spectrum L.P...............................  8.38 to 9.05%        12/31/00   $    10,002,857
                                                                                                   ---------------
                                                                                                        82,204,861
                                                                                                   ---------------
               TOTAL SENIOR COLLATERIZED TERM LOANS
               (IDENTIFIED COST $1,764,957,912).................................................     1,765,897,898
                                                                                                   ---------------
</TABLE>
    
 
   
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES
- - -----------
<C>           <S>                                                                                        <C>
              COMMON STOCK (a)(f) (0.1%)
              APPAREL
   129,050    London Fog Industries, Inc. (Restricted)
                (IDENTIFIED COST $2,258,908)...........................................................        1,929,001
                                                                                                         ---------------
</TABLE>
    
 
   
<TABLE>
<CAPTION>
       NUMBER OF                                                                                EXPIRATION
        WARRANTS                                                                                   DATE
      ------------                                                                             ------------
<C>                       <S>                                                 <C>              <C>            <C>
                          WARRANT (a)(f) (0.0%)
                          APPAREL
                          London Fog Industries, Inc.
                  7,931     (IDENTIFIED COST $1,722,237)....................................
                                                                                                  02/27/05             96,000
                                                                                                              ---------------
</TABLE>
    
 
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE
- - ------------                                                       --------------   ------------
<C>            <S>                                                 <C>              <C>            <C>
               SHORT-TERM INVESTMENTS (10.7%)
               COMMERCIAL PAPER (g) (9.2%)
               AUTOMOTIVE - FINANCE (3.9%)
$    23,000    Ford Motor Credit Co..............................      5.55%            10/01/98        23,000,000
     21,000    Ford Motor Credit Co..............................       5.30            10/06/98        20,984,542
     22,000    Ford Motor Credit Co. (h).........................       5.51            10/16/98        21,949,492
     12,000    General Motors Acceptance Corp....................       5.56            10/02/98        11,998,146
                                                                                                   ---------------
                                                                                                        77,932,180
                                                                                                   ---------------
               ENERGY (2.7%)
     54,000    Texaco, Inc. (h)..................................       5.50            10/19/98        53,851,500
                                                                                                   ---------------
               FINANCE - COMMERCIAL (0.8%)
     16,000    C I T Group Holdings Inc..........................       5.40            10/05/98        15,990,400
                                                                                                   ---------------
</TABLE>
    
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       58
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED
    
   
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                             COUPON         MATURITY
 THOUSANDS                                                              RATE            DATE            VALUE
- - ------------------------------------------------------------------------------------------------------------------
<C>            <S>                                                 <C>              <C>            <C>
               MAJOR CHEMICALS (1.8%)
$    10,000    Dupont (E.I.) De Nemours & Co.....................      5.30%            10/07/98   $     9,991,167
     26,000    Dupont (E.I.) De Nemours & Co.....................       5.51            10/09/98        25,968,164
                                                                                                   ---------------
                                                                                                        35,959,331
                                                                                                   ---------------
               TOTAL COMMERCIAL PAPER
               (AMORTIZED COST $183,733,411)....................................................       183,733,411
                                                                                                   ---------------
               REPURCHASE AGREEMENT (1.5%)
     29,271    The Bank of New York (dated 09/30/98; proceeds
                 $29,275,403) (i)
                 (IDENTIFIED COST $29,271,337)...................       5.00            10/01/98        29,271,337
                                                                                                   ---------------
               TOTAL SHORT-TERM INVESTMENTS
               (IDENTIFIED COST $213,004,748)...................................................       213,004,748
                                                                                                   ---------------
</TABLE>
    
 
   
<TABLE>
<S>                                                                                       <C>     <C>
TOTAL INVESTMENTS
(IDENTIFIED COST $1,981,943,805) (J)....................................................   99.2 %   1,980,927,647
CASH AND OTHER ASSETS IN EXCESS OF LIABILITIES..........................................    0.8        15,781,781
                                                                                          ------  ---------------
NET ASSETS..............................................................................  100.0 % $ 1,996,709,428
                                                                                          ------  ---------------
                                                                                          ------  ---------------
</TABLE>
    
 
   
- - ---------------------
 
(a)  Valued using fair value procedures - total aggregate value is
     $1,767,922,899.
(b)  Floating rate securities. Interest rates shown are those in effect at
     September 30, 1998.
(c)  Senior notes.
(d)  Participation interests were acquired through the financial institutions
     indicated parenthetically.
(e)  Non-income producing security; loan in default.
(f)  Non-income producing securities.
(g)  Securities were purchased on a discount basis. The interest rates shown
     have been adjusted to reflect a money market equivalent yield.
(h)  All of these securities are segregated in connection with unfunded loan
     commitments.
(i)  Collateralized by $26,807,417 U.S. Treasury Note 5.625% due 05/15/08 valued
     at $29,856,764.
(j)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $1,215,873 and the
     aggregate gross unrealized depreciation is $2,232,031, resulting in net
     unrealized depreciation of $1,016,158.
    
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       59
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
FINANCIAL STATEMENTS
    
 
   
STATEMENT OF ASSETS AND LIABILITIES
    
   
SEPTEMBER 30, 1998
    
 
   
<TABLE>
<S>                                                                                           <C>
ASSETS:
Investments in securities, at value
  (identified cost $1,981,943,805)..........................................................  $1,980,927,647
Cash........................................................................................       1,446,951
Receivable for:
    Interest................................................................................      13,059,776
    Shares of beneficial interest sold......................................................       8,947,291
Prepaid expenses and other assets...........................................................         211,311
                                                                                              --------------
     TOTAL ASSETS...........................................................................   2,004,592,976
                                                                                              --------------
LIABILITIES:
Payable for:
    Investment advisory fee.................................................................       1,396,769
    Dividends to shareholders...............................................................         759,415
    Administration fee......................................................................         407,696
Accrued expenses and other payables.........................................................         534,953
Deferred loan fees..........................................................................       4,784,715
Commitments and contingencies (Note 7)......................................................        --
                                                                                              --------------
     TOTAL LIABILITIES......................................................................       7,883,548
                                                                                              --------------
     NET ASSETS.............................................................................  $1,996,709,428
                                                                                              --------------
                                                                                              --------------
COMPOSITION OF NET ASSETS:
Paid-in-capital.............................................................................  $2,008,631,657
Net unrealized depreciation.................................................................      (1,016,158)
Dividends in excess of net investment income................................................        (552,409)
Accumulated net realized loss...............................................................     (10,353,662)
                                                                                              --------------
     NET ASSETS.............................................................................  $1,996,709,428
                                                                                              --------------
                                                                                              --------------
NET ASSET VALUE PER SHARE,
  201,526,077 SHARES OUTSTANDING
  (UNLIMITED SHARES AUTHORIZED OF $.01 PAR VALUE)...........................................           $9.91
                                                                                              --------------
                                                                                              --------------
</TABLE>
    
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       60
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
FINANCIAL STATEMENTS, CONTINUED
    
 
   
STATEMENT OF OPERATIONS
    
   
FOR THE YEAR ENDED SEPTEMBER 30, 1998
    
 
   
<TABLE>
<S>                                                                                             <C>
NET INVESTMENT INCOME:
INCOME
Interest......................................................................................  $136,371,569
Facility, amendment and other loan fees.......................................................     4,748,863
Other income..................................................................................       464,840
                                                                                                ------------
     TOTAL INCOME.............................................................................   141,585,272
                                                                                                ------------
EXPENSES
Investment advisory fee.......................................................................    14,434,352
Administration fee............................................................................     4,183,528
Transfer agent fees and expenses..............................................................       803,950
Professional fees.............................................................................       771,174
Facility fees.................................................................................       443,003
Registration fees.............................................................................       410,136
Shareholder reports and notices...............................................................       289,200
Custodian fees................................................................................       100,267
Trustees' fees and expenses...................................................................        19,434
Other.........................................................................................       176,760
                                                                                                ------------
     TOTAL EXPENSES...........................................................................    21,631,804
                                                                                                ------------
     NET INVESTMENT INCOME....................................................................   119,953,468
                                                                                                ------------
NET REALIZED AND UNREALIZED GAIN (LOSS):
Net realized loss.............................................................................   (10,227,863)
Net change in unrealized depreciation.........................................................     2,829,220
                                                                                                ------------
     NET LOSS.................................................................................    (7,398,643)
                                                                                                ------------
NET INCREASE..................................................................................  $112,554,825
                                                                                                ------------
                                                                                                ------------
</TABLE>
    
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       61
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
FINANCIAL STATEMENTS, CONTINUED
    
 
   
STATEMENT OF CHANGES IN NET ASSETS
    
 
   
<TABLE>
<CAPTION>
                                                                         FOR THE YEAR        FOR THE YEAR
                                                                            ENDED               ENDED
                                                                      SEPTEMBER 30, 1998  SEPTEMBER 30, 1997
- - ------------------------------------------------------------------------------------------------------------
<S>                                                                   <C>                 <C>
INCREASE (DECREASE) IN NET ASSETS:
OPERATIONS:
Net investment income...............................................  $     119,953,468   $      86,249,515
Net realized gain (loss)............................................        (10,227,863 )         3,073,930
Net change in unrealized depreciation...............................          2,829,220          (3,410,252 )
                                                                      ------------------  ------------------
     NET INCREASE...................................................        112,554,825          85,913,193
Dividends from net investment income................................       (120,722,134 )       (84,598,513 )
Net increase from transactions in shares of beneficial interest.....        660,273,515         403,817,997
                                                                      ------------------  ------------------
     NET INCREASE...................................................        652,106,206         405,132,677
NET ASSETS:
Beginning of period.................................................      1,344,603,222         939,470,545
                                                                      ------------------  ------------------
     END OF PERIOD
    (INCLUDING DIVIDENDS IN EXCESS OF NET INVESTMENT INCOME OF
    $552,409 AND UNDISTRIBUTED NET INVESTMENT INCOME OF $526,876,
    RESPECTIVELY)...................................................  $   1,996,709,428   $   1,344,603,222
                                                                      ------------------  ------------------
                                                                      ------------------  ------------------
</TABLE>
    
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       62
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
FINANCIAL STATEMENTS, CONTINUED
    
 
   
STATEMENT OF CASH FLOWS
    
   
FOR THE YEAR ENDED SEPTEMBER 30, 1998
    
 
   
<TABLE>
<S>                                                                                  <C>
INCREASE (DECREASE) IN CASH:
CASH FLOWS PROVIDED BY OPERATING ACTIVITIES:
Net investment income..............................................................  $      119,953,468
Adjustments to reconcile net investment income to net cash provided by operating
activities:
Increase in receivables and other assets related to operations.....................          (5,071,990)
Increase in payables related to operations.........................................             754,088
Net loan fees received.............................................................           5,158,117
Amortization of loan fees..........................................................          (4,748,863)
Accretion of discounts.............................................................             779,503
                                                                                     ------------------
     NET CASH PROVIDED BY OPERATING ACTIVITIES.....................................         116,824,323
                                                                                     ------------------
CASH FLOWS USED FOR INVESTING ACTIVITIES:
Purchases of investments...........................................................      (1,615,617,814)
Principal repayments/sales of investments..........................................         981,437,783
Net purchases of short-term investments............................................         (27,417,522)
                                                                                     ------------------
     NET CASH USED FOR INVESTING ACTIVITIES........................................        (661,597,553)
                                                                                     ------------------
CASH FLOWS PROVIDED BY FINANCING ACTIVITIES:
Shares of beneficial interest sold.................................................         731,134,981
Shares tendered....................................................................        (130,137,075)
Dividends from net investment income (net of reinvested dividends of
 $54,381,913)......................................................................         (66,805,964)
                                                                                     ------------------
     NET CASH PROVIDED BY FINANCING ACTIVITIES.....................................         534,191,942
                                                                                     ------------------
NET DECREASE IN CASH...............................................................         (10,581,288)
CASH BALANCE AT BEGINNING OF YEAR..................................................          12,028,239
                                                                                     ------------------
CASH BALANCE AT END OF YEAR........................................................  $        1,446,951
                                                                                     ------------------
                                                                                     ------------------
</TABLE>
    
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       63
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1998
    
 
   
1. ORGANIZATION AND ACCOUNTING POLICIES
    
 
   
Morgan Stanley Dean Witter Prime Income Trust (the "Trust"), formerly Prime
Income Trust, is registered under the Investment Company Act of 1940, as
amended, as a non-diversified, closed-end management investment company. The
Trust's investment objective is to provide a high level of current income
consistent with the preservation of capital. The Trust was organized as a
Massachusetts business trust on August 17, 1989 and commenced operations on
November 30, 1989.
    
 
   
The Trust offers and sells its shares to the public on a continuous basis. The
Trustees intend, each quarter, to consider authorizing the Trust to make tender
offers for all or a portion of its outstanding shares of beneficial interest at
the then current net asset value of such shares.
    
 
   
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.
    
 
   
The following is a summary of significant accounting policies:
    
 
   
A. VALUATION OF INVESTMENTS -- (1) The Trustees believe that, at present, there
are not sufficient market quotations provided by banks, dealers or pricing
services respecting interests in senior collateralized loans ("Senior Loans") to
corporations, partnerships and other entities ("Borrower") to enable the Trust
to properly value Senior Loans based on available market quotations.
Accordingly, until the market for Senior Loans develops, interests in Senior
Loans held by the Trust are valued at their fair value in accordance with
procedures established in good faith by the Trustees. Under the procedures,
adopted by the Trustees, interests in Senior Loans are priced using a matrix
which takes into account the relationship between current interest rates and
interest rates payable on each Senior Loan, as well as the total number of days
in each interest period and the period remaining until the next interest rate
determination or maturity of the Senior Loan. Adjustments in the matrix-
determined price of a Senior Loan will be made in the event of a default on a
Senior Loan or a significant change in the creditworthiness of the Borrower. The
fair values determined in accordance with these procedures may differ
significantly from the market values that would have been used had a ready
market for the Senior Loans existed; (2) portfolio securities for which
over-the-counter market quotations are readily available are valued at the
latest bid price; (3) all other securities and other assets are valued at their
fair value as determined in good faith under procedures established by and under
the general supervision of the Trustees; and (4) short-term debt securities
having a maturity date of more than sixty days at time of purchase are valued on
a mark-to-market basis until
    
 
                                       64
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1998 , CONTINUED
    
 
   
sixty days prior to maturity and thereafter at amortized cost based on their
value on the 61st day. Short-term debt securities having a maturity date of
sixty days or less at the time of purchase are valued at amortized cost.
    
 
   
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.
Interest income is accrued daily except where collection is not expected. When
the Trust buys an interest in a Senior Loan, it may receive a facility fee,
which is a fee paid to lenders upon origination of a Senior Loan and/or a
commitment fee which is paid to lenders on an ongoing basis based upon the
undrawn portion committed by the lenders of the underlying Senior Loan. The
Trust amortizes the facility fee and accrues the commitment fee over the
expected term of the loan. When the Trust sells an interest in a Senior Loan, it
may be required to pay fees or commissions to the purchaser of the interest.
Fees received in connection with loan amendments are amortized over the expected
term of the loan.
    
 
   
C. SENIOR LOANS -- The Trust invests primarily in Senior Loans to Borrowers.
Senior Loans are typically structured by a syndicate of lenders ("Lenders"), one
or more of which administers the Senior Loan on behalf of the Lenders ("Agent").
Lenders may sell interests in Senior Loans to third parties ("Participations")
or may assign all or a portion of their interest in a Senior Loan to third
parties ("Assignments"). Senior Loans are exempt from registration under the
Securities Act of 1933. Presently, Senior Loans are not readily marketable and
are often subject to restrictions on resale.
    
 
   
Some of the Trust's Senior Loans are "Revolver Loans." For these loans, the
Trust commits to provide funding up to the face amount of the loan. The amount
drawn down by the borrower may vary during the term of the loan.
    
 
   
D. FEDERAL INCOME TAX STATUS -- It is the Trust's policy to comply with the
requirements of the Internal Revenue Code applicable to regulated investment
companies and to distribute all of its taxable income to its shareholders.
Accordingly, no federal income tax provision is required.
    
 
   
E. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Trust records dividends
and distributions to its shareholders on the record date. The amount of
dividends and distributions from net investment income and net realized capital
gains are determined in accordance with federal income tax regulations which may
differ from generally accepted accounting principles. These "book/tax"
differences are either considered temporary or permanent in nature. To the
extent these differences are permanent in nature, such amounts are reclassified
within the capital accounts based on their
    
 
                                       65
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1998 , CONTINUED
    
 
   
federal tax-basis treatment; temporary differences do not require
reclassification. Dividends and distributions which exceed net investment income
and net realized capital gains for financial reporting purposes but not for tax
purposes are reported as dividends in excess of net investment income or
distributions in excess of net realized capital gains. To the extent they exceed
net investment income and net realized capital gains for tax purposes, they are
reported as distributions of paid-in-capital.
    
 
   
2. INVESTMENT ADVISORY AGREEMENT
    
 
   
Pursuant to an Investment Advisory Agreement with Morgan Stanley Dean Witter
Advisors Inc. (the "Investment Advisor"), formerly Dean Witter InterCapital
Inc., the Trust pays an advisory fee, accrued daily and payable monthly, by
applying the following annual rates to the net assets of the Trust determined as
of the close of each business day: 0.90% to the portion of the daily net assets
not exceeding $500 million and 0.85% to the portion of the daily net assets
exceeding $500 million. Effective May 1, 1998, the Agreement was amended to
reduce the annual fee to 0.825% of the portion of daily net assets exceeding
$1.5 billion.
    
 
   
Under the terms of the Agreement, in addition to managing the Trust's
investments, the Investment Advisor pays the salaries of all personnel,
including officers of the Trust, who are employees of the Investment Advisor.
    
 
   
3. ADMINISTRATION AGREEMENT
    
 
   
Pursuant to an Administration Agreement with Morgan Stanley Dean Witter Services
Company Inc. (the "Administrator"), an affiliate of the Investment Advisor, the
Trust pays an administration fee, calculated daily and payable monthly, by
applying the annual rate of 0.25% to the Trust's daily net assets.
    
 
   
Under the terms of the Administration Agreement, the Administrator maintains
certain of the Trust's books and records and furnishes, at its own expense,
office space, facilities, equipment, clerical, bookkeeping and certain legal
services and pays the salaries of all personnel, including officers of the Trust
who are employees of the Administrator. The Administrator also bears the cost of
telephone services, heat, light, power and other utilities provided to the
Trust.
    
 
                                       66
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1998 , CONTINUED
    
 
   
4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
    
 
   
The cost of purchases and proceeds from sales/principal repayments of portfolio
securities, excluding short-term investments, for the year ended September 30,
1998 aggregated $1,615,617,814 and $981,192,947, respectively.
    
 
   
Shares of the Trust are distributed by Morgan Stanley Dean Witter Distributors
Inc. (the "Distributor"), an affiliate of the Investment Advisor and
Administrator. Pursuant to a Distribution Agreement between the Trust, the
Investment Advisor and the Distributor, the Investment Advisor compensates the
Distributor at an annual rate of 2.75% of the purchase price of shares purchased
from the Trust. The Investment Advisor will compensate the Distributor at an
annual rate of 0.10% of the value of shares sold for any shares that remain
outstanding after one year from the date of their initial purchase. Any early
withdrawal charge to defray distribution expenses will be charged to the
shareholder in connection with shares held for four years or less which are
accepted by the Trust for repurchase pursuant to tender offers. For the year
ended September 30, 1998, the Investment Advisor has informed the Trust that it
received approximately $2,085,000 in early withdrawal charges.
    
 
   
Morgan Stanley Dean Witter Trust FSB, an affiliate of the Investment Advisor and
Administrator, is the Trust's transfer agent. At September 30, 1998, the Trust
had transfer agent fees and expenses payable of approximately $7,200.
    
 
   
The Trust has an unfunded noncontributory defined benefit pension plan covering
all independent Trustees of the Trust who will have served as independent
Trustees for at least five years at the time of retirement. Benefits under this
plan are based on years of service and compensation during the last five years
of service. Aggregate pension costs for the year ended September 30, 1998
included in Trustees' fees and expenses in the Statement of Operations amounted
to $5,577. At September 30, 1998, the Trust had an accrued pension liability of
$50,637 which is included in accrued expenses in the Statement of Assets and
Liabilities.
    
 
   
5. FEDERAL INCOME TAX STATUS
    
 
   
During the year ended September 30, 1998, the Trust utilized approximately
$49,000 of its net capital loss carryover. At September 30, 1998, the Trust had
a net capital loss carryover of approximately $62,000 available through
September 30, 2004 to offset future capital gains to the extent provided by
regulations. Capital losses incurred after October 31 ("post-October" losses)
    
 
                                       67
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1998 , CONTINUED
    
 
   
within the taxable year are deemed to arise on the first business day of the
Trust's next taxable year. The Trust incurred and will elect to defer net
capital losses of approximately $10,246,000 during fiscal 1998.
    
 
   
As of September 30, 1998, the Trust had temporary book/tax differences primarily
attributable to post-October losses and permanent book/tax differences
attributable to tax adjustments on revolver loans sold by the Trust. To reflect
reclassifications arising from the permanent differences, dividends in excess of
net investment income was charged and accumulated net realized loss was credited
$310,619.
    
 
   
6. SHARES OF BENEFICIAL INTEREST
    
 
   
Transactions in shares of beneficial interest were as follows:
    
 
   
<TABLE>
<CAPTION>
                                                                     SHARES          AMOUNT
                                                                   -----------   --------------
<S>                                                                <C>           <C>
Balance, September 30, 1996......................................   94,535,310   $  944,540,145
Shares sold......................................................   45,281,310      450,176,134
Shares issued to shareholders for reinvestment of dividends......    3,988,872       39,655,716
Shares tendered (four quarterly tender offers)...................   (8,650,509)     (86,013,853)
                                                                   -----------   --------------
Balance, September 30, 1997......................................  135,154,983    1,348,358,142
Shares sold......................................................   73,974,045      735,805,027
Shares issued to shareholders for reinvestment of dividends......    5,468,432       54,381,913
Shares tendered (four quarterly tender offers)...................  (13,071,383)    (129,913,425)
                                                                   -----------   --------------
Balance, September 30, 1998......................................  201,526,077   $2,008,631,657
                                                                   -----------   --------------
                                                                   -----------   --------------
</TABLE>
    
 
   
On October 28, 1998, the Trustees approved a tender offer to purchase up to 10
million shares of beneficial interest to commence on November 18, 1998.
    
 
                                       68
<PAGE>
   
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
    
   
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1998 , CONTINUED
    
 
   
7. COMMITMENTS AND CONTINGENCIES
    
 
   
As of September 30, 1998, the Trust had unfunded loan commitments pursuant to
the following loan agreements:
    
 
   
<TABLE>
<CAPTION>
                                                                      UNFUNDED
BORROWER                                                             COMMITMENT
- - -----------------------------------------------------------------  --------------
<S>                                                                <C>
Alliance Imaging, Inc............................................  $    4,588,235
Arena Brands, Inc................................................       1,482,167
Chancellor Media Corp............................................       4,312,000
Corning Consumer Products Inc....................................         690,909
Crown Paper Co...................................................       3,598,874
Dade International, Inc..........................................         645,289
E & S Holdings Corp..............................................       3,007,059
Fairchild Holding Corp...........................................       3,750,000
Graham Packaging Co..............................................       3,857,143
Jet Plastica Industries, Inc.....................................       1,945,946
Mafco Finance Corp...............................................       8,347,500
MJD Communications, Inc..........................................       9,006,333
Specialty Foods Corp.............................................       6,392,694
Supercanal Holdings S.A..........................................       8,651,408
Teligent Inc.....................................................      10,000,000
The Stroh Brewery Co.............................................       1,245,000
U.S. Silica Co. (Acquistion).....................................       1,500,000
U.S. Silica Co. (Working Capital)................................       1,500,000
                                                                   --------------
                                                                   $   74,520,557
                                                                   --------------
                                                                   --------------
</TABLE>
    
 
   
The total value of securities segregated for unfunded loan commitments were
$75,800,992.
    
 
                                       69
<PAGE>
                                                                      APPENDIX A
 
HEDGING TRANSACTIONS
- - --------------------------------------------------------------------------------
 
    INTEREST RATE AND OTHER HEDGING TRANSACTIONS.  The Trust may in the future
enter into various interest rate hedging and risk management transactions;
however, it does not presently intend to engage in such transactions and will do
so only after providing 30 days' written notice to shareholders. If in the
future the Trust were to engage in such transactions, it expects to do so
primarily to seek to preserve a return on a particular investment or portion of
its portfolio, and may also enter into such transactions to seek to protect
against decreases in the anticipated rate of return on floating or variable rate
financial instruments the Trust owns or anticipates purchasing at a later date,
or for other risk management strategies such as managing the effective
dollar-weighted average duration of the Trust's portfolio. In addition, with
respect to fixed-income securities in the Trust's portfolio or to the extent an
active secondary market develops in interests in Senior Loans in which the Trust
may invest, the Trust may also engage in hedging transactions to seek to protect
the value of its portfolio against declines in net asset value resulting from
changes in interest rates or other market changes. The Trust will not engage in
any of the transactions for speculative purposes and will use them only as a
means to hedge or manage the risks associated with assets held in, or
anticipated to be purchased for, the Trust's portfolio or obligations incurred
by the Trust. The successful utilization of hedging and risk management
transactions requires skills different from those needed in the selection of the
Trust's portfolio securities. The Investment Advisor currently actively utilizes
various hedging techniques in connection with its management of other fixed
income portfolios and the Trust believes that the Investment Advisor possesses
the skills necessary for the successful utilization of hedging and risk
management transactions. The Trust will incur brokerage and other costs in
connection with its hedging transactions.
 
    The types of hedging transactions in which the Trust is most likely to
engage are interest rate swaps and the purchase or sale of interest rate caps or
floors. The Trust will not sell interest rate caps or floors that it does not
own. Interest rate swaps involve the exchange by the Trust with another party of
their respective obligations to pay or receive interest, e.g., an exchange of an
obligation to make floating rate payments for an obligation to make fixed rate
payments. The purchase of an interest rate cap entitles the Purchaser, to the
extent that a specified index exceeds a predetermined interest rate, to receive
payments of interest at the difference of the index and the predetermined rate
on a notional principal amount (the reference amount with respect to which
payment obligations are determined, although no actual exchange of principal
occurs) from the party selling such interest rate cap. The purchase of an
interest rate floor entitles the purchaser, to the extent that a specified index
falls below a predetermined interest rate, to receive payments of interest at
the difference of the index and the predetermined rate on a notional principal
amount from the party selling such interest rate floor.
 
    In circumstances in which the Investment Advisor anticipates that interest
rates will decline, the Trust might, for example, enter into an interest rate
swap as the floating rate payor. In the case where the Trust purchases such an
interest rate swap, if the floating rate payments fell below the level of the
fixed rate payment set in the swap agreement, the Trust's counterparty would pay
the Trust amounts equal to interest computed at the difference between the fixed
and floating rates over the notional principal amount. Such payments would
offset or partially offset the decrease in the payments the Trust would receive
in respect of floating rate assets being hedged. In the case of purchasing an
interest rate floor, if interest rates declined below the floor rate, the Trust
would receive payments from its counterparty which would wholly or partially
offset the decrease in the payments it would receive in respect of the financial
instruments being hedged.
 
                                       70
<PAGE>
    The successful use of swaps, caps and floors to preserve the rate of return
on a portfolio of financial instruments depends on the Investment Advisor's
ability to predict correctly the direction and degree of movements in interest
rates. Although the Trust believes that use of the hedging and risk management
techniques described above will benefit the Trust, if the Investment Advisor's
judgment about the direction or extent of the movement in interest rates is
incorrect, the Trust's overall performance would be worse than if it had not
entered into any such transactions. For example, if the Trust had purchased an
interest rate swap or an interest rate floor to hedge against its expectation
that interest rates would decline but instead interest rates rose, the Trust
would lose part or all of the benefit of the increased payments it would receive
as a result of the rising interest rates because it would have to pay amounts to
its counterparty under the swap agreement or would have paid the purchase price
of the interest rate floor.
 
    Any interest rate swaps entered into by the Trust would usually be done on a
net basis, i.e., where the two parties make net payments with the Trust
receiving or paying, as the case may be, only the net amount of the two
payments. Inasmuch as any such hedging transactions entered into by the Trust
will be for good-faith risk management purposes, the Investment Advisor and the
Trust believe such obligations do not constitute senior securities and,
accordingly, will not treat them as being subject to its investment restrictions
on borrowing. The net amount of the excess, if any, of the Trust's obligations
over its entitlements with respect to each interest rate swap will be accrued
and an amount of cash or liquid portfolio securities having an aggregate net
asset value at least equal to the accrued excess will be maintained in a
segregated account by the Trust's custodian.
 
    The Trust will not enter into interest rate swaps, caps or floors if on a
net basis the aggregate notional principal amount with respect to such agreement
exceeds the net assets of the Trust. Thus, the Trust may enter into interest
rate swaps, caps or floors with respect to its entire portfolio.
 
    There is no limit on the amount of interest rate swap transactions that may
be entered into by the Trust. These transactions do not involve the delivery of
securities or other underlying assets or principal. Accordingly, the risk of
loss with respect to interest rate swaps is limited to the net amount of
interest payments that the Trust is contractually obligated to make. If the
other party to an interest rate swap defaults, the Trust's risk of loss consists
of the net amount of interest payments that the Trust contractually is entitled
to receive. The creditworthiness of firms with which the Trust enters into
interest rate swaps, caps or floors will be monitored on an ongoing basis by the
Investment Advisor pursuant to procedures adopted and reviewed, on an ongoing
basis, by the Board of Trustees of the Trust. If a default occurs by the other
party to such transaction, the Trust will have contractual remedies pursuant to
the agreements related to the transaction but such remedies may be subject to
bankruptcy and insolvency laws which could affect the Trust's rights as a
creditor. The swap market has grown substantially in recent years with a large
number of banks and investment banking firms acting both as principals and as
agents utilizing standardized swap documentation. As a result, the swap market
has become relatively liquid. Caps and floors are more recent innovations and
they are less liquid than swaps.
 
    The Trust is also authorized to enter into hedging transactions involving
financial futures and options, but presently believes it is unlikely that it
would enter into such transactions. The Trust may also invest in any new
financial products which may be developed to the extent determined by the Board
of Trustees to be consistent with its investment objective and otherwise in the
best interests of the Trust and its shareholders. The Trust will engage in such
transactions only to the extent permitted under applicable law and after
providing 30 days' written notice to shareholders.
 
                                       71
<PAGE>
Morgan Stanley Dean Witter Prime Income Trust
 
Two World Trade Center
New York, New York 10048
 
TRUSTEES
- - ---------------------------------------------
 
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John H. Haire
Wayne E. Hedien
Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
- - ---------------------------------------------
 
Charles A. Fiumefreddo
Chairman and Chief Executive Officer
Barry Fink
Vice President, Secretary and
General Counsel
 
Rajesh K. Gupta
Vice President
 
Thomas F. Caloia
Treasurer
 
CUSTODIAN
- - ---------------------------------------------
 
The Bank of New York
90 Washington Street
New York, New York 10286
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
- - ---------------------------------------------
 
Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
- - ---------------------------------------------
 
PricewaterhouseCoopers LLP
1177 Avenue of Americas
New York, New York 10036
 
INVESTMENT ADVISOR
- - ---------------------------------------------
 
Morgan Stanley Dean Witter Advisors Inc.
Two World Trade Center
New York, New York 10048
 
ADMINISTRATOR
- - ---------------------------------------------
 
Morgan Stanley Dean Witter Services Company Inc.
Two World Trade Center
New York, New York 10048
 
DISTRIBUTOR
- - ---------------------------------------------
 
Morgan Stanley Dean Witter Distributors Inc.
Two World Trade Center
New York, New York 10048
 
MORGAN STANLEY
DEAN WITTER
PR IME INCOME TRUST
 
   
                          [PHOTO]
 
              PROSPECTUS --            , 1998
    
<PAGE>

                   MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST

                             PART C  OTHER INFORMATION

Item 24.  Financial Statements and Exhibits

     (a)  FINANCIAL STATEMENTS 

     (1)  Financial statements and schedules, included
          in Prospectus (Part A):                                     Page in 
                                                                      Prospectus
                                                                      ---------
          Financial highlights for the period November 30, 1989 
          (commencement of operations) through September 30, 1990 
          and for the years ended September 30, 1991, 1992, 1993, 1994,
          1995, 1996, 1997 and 1998  . . . . . . . . . . . . . . . . .    4

          Portfolio of Investments at September 30, 1998 . . . . . . .   48

          Statement of assets and liabilities at September 30, 1998. .   60

          Statement of operations for the year ended
           September 30, 1998  . . . . . . . . . . . . . . . . . . . .   61

          Statement of changes in net assets for the fiscal
          years ended September 30, 1997 and September 30, 1998. . . .   62

          Notes to Financial Statements  . . . . . . . . . . . . . . .   64

     (2)  Financial statements included in Part C:

          None

(b)  EXHIBITS:
 
     1.     Form of Amendment to the Declaration of Trust of the Registrant.

     7.     Form of Amended Investment Advisory Agreement between the 
            Registrant and Morgan Stanley Dean Witter Advisors Inc.

     10.    Form of Amended and Restated Transfer Agency and Service Agreement
            between the Registrant and Morgan Stanley Dean Witter Trust FSB 

     12.(a) Opinion of Barry Fink, Esq.

     12.(b) Opinion of Lane Altman & Owens LLP.

     14.    Consent of Independent Accountants.

     15.    Schedule for Computations of Performance Quotations.
<PAGE>

     18.  Financial Data Schedule as of September 30, 1998.

  Other.  Powers of Attorney

- - --------------------------------------------------------------------------------
All other exhibits were previously filed via EDGAR and are hereby incorporated
by reference.

Item 25.  MARKETING ARRANGEMENTS.

          Not Applicable
 
Item 26.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

          Securities and Exchange Commission                $     964,243
               Registration Fee
          Blue Sky Fees and Expenses                        $        0.00
               (including fees of counsel)
          Transfer Agent Fee                                $        0.00
          Accounting Fees and Expenses                      $        0.00
          Legal Fees and Expenses                           $      18,000
          Printing and Engraving                            $      90,000
          Miscellaneous                                     $       5,000
          Total                                             $   1,077,243
               
Item 27.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT.

          None

Item 28.  NUMBER OF HOLDERS OF SECURITIES.

          (1)                 (2)
                              Number of Record Holders
     Title of Class              at October 31, 1998
     --------------           -------------------------

Shares of Beneficial Interest          77,556

Item 29.  INDEMNIFICATION.

     Pursuant to Section 5.3 of the Registrant's Declaration of Trust and under
Section 4.8 of the Registrant's By-Laws, the indemnification of the Registrant's
trustees, officers, employees and agents is permitted if it is determined that
they acted under the belief that their actions were in or not opposed to the
best interest of the Registrant, and, with respect to any criminal proceeding,
they had reasonable cause to believe their conduct was not unlawful.  In
addition, indemnification is permitted only if it is determined that the actions
in question did not render them liable by reason of willful misfeasance, bad
faith or gross negligence in the performance of their duties or by reason of
reckless disregard of their obligations and duties to the Registrant.  Trustees,
officers, employees and agents will be indemnified for the expense of litigation
if it is determined that they are entitled to indemnification against any
liability established in such litigation.  The Registrant may also advance money
for these expenses provided that they give their undertakings to repay the
Registrant unless their conduct is later determined to permit indemnification.


                                          2
<PAGE>

     Pursuant to Section 5.2 of the Registrant's Declaration of Trust and
paragraph 8 of the Registrant's Investment Management Agreement, neither the
Investment Manager nor any trustee, officer, employee or agent of the Registrant
shall be liable for any action or failure to act, except in the case of bad
faith, willful misfeasance, gross negligence or reckless disregard of duties to
the Registrant.

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 (the "Act") may be permitted to trustees, officers and controlling
persons of the Registrant pursuant to the foregoing provisions or otherwise, the
Registrant has been advised that in the opinion of the  Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable.  In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a trustee, officer, or controlling person of the Registrant
in connection with the successful defense of any action, suit or proceeding) is
asserted against the Registrant by such trustee, officer or controlling person
in connection with the shares being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act, and will
be governed by the final adjudication of such issue.

     The Registrant hereby undertakes that it will apply the indemnification
provision of its by-laws in a manner consistent with Release 11330 of the
Securities and Exchange Commission under the Investment Company Act of 1940, so
long as the interpretation of Sections 17(h) and 17(i) of such Act remains in
effect.

     Registrant, in conjunction with the Investment Manager, Registrant's
Trustees, and other registered investment management companies managed by the
Investment Manager, maintains insurance on behalf of any person who is or was a
Trustee, officer, employee, or agent of Registrant, or who is or was serving at
the request of Registrant as a trustee, director, officer, employee or agent of
another trust or corporation, against any liability asserted against him and
incurred by him or arising out of his position.  However, in no event will
Registrant maintain insurance to indemnify any such person for any act for which
Registrant itself is not permitted to indemnify him.
     
Item 30. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER.
     
     See "The Fund and Its Management" in the Prospectus regarding the business
of the investment advisor.  The following information is given regarding
officers of Morgan Stanley Dean Witter Advisors Inc. ("MSDW Advisors").  MSDW
Advisors is a wholly-owned subsidiary of Morgan Stanley Dean Witter & Co.  The
principal address of the Morgan Stanley Dean Witter Funds is Two World Trade
Center, New York, New York 10048.

     The term "Morgan Stanley Dean Witter Funds" refers to the following
registered investment companies:

Closed-End Investment Companies
- - --------------------------------
(1)  Dean Witter Government Income Trust
(2)  High Income Advantage Trust
(3)  High Income Advantage Trust II
(4)  High Income Advantage Trust III


                                          3
<PAGE>

(5)    InterCapital California Insured Municipal Income Trust
(6)    InterCapital California Quality Municipal Securities
(7)    InterCapital Income Securities Inc.
(8)    InterCapital Insured California Municipal Securities
(9)    InterCapital Insured Municipal Bond Trust
(10)   InterCapital Insured Municipal Income Trust
(11)   InterCapital Insured Municipal Securities
(12)   InterCapital Insured Municipal Trust
(13)   InterCapital New York Quality Municipal Securities
(14)   InterCapital Quality Municipal Income Trust
(15)   InterCapital Quality Municipal Investment Trust
(16)   InterCapital Quality Municipal Securities
(17)   Municipal Income Opportunities Trust
(18)   Municipal Income Opportunities Trust II
(19)   Municipal Income Opportunities Trust III
(20)   Municipal Income Trust
(21)   Municipal Income Trust II
(22)   Municipal Income Trust III
(23)   Municipal Premium Income Trust
(24)   Morgan Stanley Dean Witter Prime Income Trust

       Open-end Investment Companies
       -----------------------------
(1)    Active Assets California Tax-Free Trust
(2)    Active Assets Government Securities Trust
(3)    Active Assets Money Trust
(4)    Active Assets Tax-Free Trust
(5)    Morgan Stanley Dean Witter American Value Fund
(6)    Morgan Stanley Dean Witter Balanced Growth Fund
(7)    Morgan Stanley Dean Witter Balanced Income Fund
(8)    Morgan Stanley Dean Witter California Tax-Free Daily Income Trust
(9)    Morgan Stanley Dean Witter California Tax-Free Income Fund
(10)   Morgan Stanley Dean Witter Capital Appreciation Fund
(11)   Morgan Stanley Dean Witter Capital Growth Securities
(12)   Morgan Stanley Dean Witter Competitive Edge Fund, "BEST IDEAS PORTFOLIO"
(13)   Morgan Stanley Dean Witter Convertible Securities Trust
(14)   Morgan Stanley Dean Witter Developing Growth Securities Trust
(15)   Morgan Stanley Dean Witter Diversified Income Trust 
(16)   Morgan Stanley Dean Witter Dividend Growth Securities Inc.
(17)   Morgan Stanley Dean Witter Equity Fund
(18)   Morgan Stanley Dean Witter European Growth Fund Inc.
(19)   Morgan Stanley Dean Witter Federal Securities Trust
(20)   Morgan Stanley Dean Witter Financial Services Trust
(21)   Morgan Stanley Dean Witter Fund of Funds
(22)   Morgan Stanley Dean Witter Global Dividend Growth Securities
(23)   Morgan Stanley Dean Witter Global Short-Term Income Fund Inc.
(24)   Morgan Stanley Dean Witter Global Utilities Fund
(25)   Morgan Stanley Dean Witter Growth Fund
(26)   Morgan Stanley Dean Witter Hawaii Municipal Trust
(27)   Morgan Stanley Dean Witter Health Sciences Trust
(28)   Morgan Stanley Dean Witter High Yield Securities Inc.


                                          4
<PAGE>

(29)   Morgan Stanley Dean Witter Income Builder Fund
(30)   Morgan Stanley Dean Witter Information Fund
(31)   Morgan Stanley Dean Witter Intermediate Income Securities
(32)   Morgan Stanley Dean Witter International SmallCap Fund
(33)   Morgan Stanley Dean Witter Japan Fund
(34)   Morgan Stanley Dean Witter Limited Term Municipal Trust
(35)   Morgan Stanley Dean Witter Liquid Asset Fund Inc.
(36)   Morgan Stanley Dean Witter Market Leader Trust
(37)   Morgan Stanley Dean Witter Mid-Cap Dividend Growth Securities
(38)   Morgan Stanley Dean Witter Mid-Cap Growth Fund
(39)   Morgan Stanley Dean Witter Multi-State Municipal Series Trust
(40)   Morgan Stanley Dean Witter Natural Resource Development Securities Inc.
(41)   Morgan Stanley Dean Witter New York Municipal Money Market Trust
(42)   Morgan Stanley Dean Witter New York Tax-Free Income Fund
(43)   Morgan Stanley Dean Witter Pacific Growth Fund Inc.
(44)   Morgan Stanley Dean Witter Precious Metals and Minerals Trust
(45)   Morgan Stanley Dean Witter S&P 500 Index Fund
(46)   Morgan Stanley Dean Witter S&P 500 Select Fund
(47)   Morgan Stanley Dean Witter Select Dimensions Investment Series
(48)   Morgan Stanley Dean Witter Select Municipal Reinvestment Fund
(49)   Morgan Stanley Dean Witter Short-Term Bond Fund
(50)   Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust
(51)   Morgan Stanley Dean Witter Special Value Fund
(52)   Morgan Stanley Dean Witter Strategist Fund 
(53)   Morgan Stanley Dean Witter Tax-Exempt Securities Trust
(54)   Morgan Stanley Dean Witter Tax-Free Daily Income Trust
(55)   Morgan Stanley Dean Witter U.S. Government Money Market Trust
(56)   Morgan Stanley Dean Witter U.S. Government Securities Trust
(57)   Morgan Stanley Dean Witter Utilities Fund
(58)   Morgan Stanley Dean Witter Value-Added Market Series
(59)   Morgan Stanley Dean Witter Value Fund
(60)   Morgan Stanley Dean Witter Variable Investment Series
(61)   Morgan Stanley Dean Witter World Wide Income Trust

The term "TCW/DW Funds" refers to the following registered investment companies:

       Open-End Investment Companies
       -----------------------------
(1)    TCW/DW Emerging Markets Opportunities Trust
(2)    TCW/DW Global Telecom Trust
(3)    TCW/DW Income and Growth Fund
(4)    TCW/DW Latin American Growth Fund
(5)    TCW/DW Mid-Cap Equity Trust
(6)    TCW/DW North American Government Income Trust
(7)    TCW/DW Small Cap Growth Fund
(8)    TCW/DW Total Return Trust

       Closed-End Investment Companies 
       -------------------------------
(1)    TCW/DW Term Trust 2000
(2)    TCW/DW Term Trust 2002 
(3)    TCW/DW Term Trust 2003


                                          5
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION,
MORGAN STANLEY DEAN           VOCATION WITH OR EMPLOYMENT, INCLUDING NAME,
WITTER ADVISORS INC.          PRINCIPAL ADDRESS AND NATURE OF CONNECTION
- - --------------------          -------------------------------------------
<S>                           <C>
Mitchell M. Merin             Chairman and Director of Morgan Stanley Dean Witter
President, Chief              Distributors Inc. ("MSDW Distributors") and Morgan Stanley Dean
Executive Officer and         Witter Trust FSB ("MSDW Trust"); President,Chief Executive Officer
Director                      and Director of Morgan Stanley Dean Witter Services Company Inc.
                              ("MSDW Services"); Executive Vice President and Director of Dean
                              Witter Reynolds Inc. ("DWR"); Director of SPS Transaction Services,
                              Inc. and various other Morgan Stanley Dean Witter & Co. ("MSDW") subsidiaries.
                         
Thomas C. Schneider           Executive Vice President and Chief Strategic and
Executive Vice                Administrative Officer of MSDW; Executive Vice
President and  Chief          President and Chief Financial Officer of MSDW Services;
Financial Officer             Director of DWR and MSDW.

Robert M. Scanlan             President, Chief Operating Officer and Director of MSDW 
President, Chief              Services, Executive Vice President of MSDW Distributors; 
Operating Officer             Executive Vice President and Director of MSDW Trust; 
and Director                  Vice President of the Morgan Stanley Dean Witter Funds and the TCW/DW Funds.

Joseph J. McAlinden           Vice President of the Morgan Stanley Dean Witter Funds 
Executive Vice President      and Director of MSDW Trust.
and Chief Investment
Officer   

Ronald E. Robison             Vice President of the Morgan Stanley Dean Witter Funds 
Executive Vice President      and the TCW/DW Funds.
and Chief Administrative
Officer

Edward C. Oelsner, III
Executive Vice President

Barry Fink                    Assistant Secretary of DWR; Senior Vice President,
Senior Vice President,        Secretary, General Counsel and Director of MSDW Services;
Secretary, General            Senior Vice President, Assistant Secretary and Assistant
Counsel and Director          General Counsel of MSDW Distributors; Vice President, Secretary and
                              General Counsel of the Morgan Stanley Dean Witter Funds and the TCW/DW Funds.
                         
Peter M. Avelar               Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.

Mark Bavoso                   Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.    
</TABLE>


                                         6
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION,
MORGAN STANLEY DEAN           VOCATION WITH OR EMPLOYMENT, INCLUDING NAME,
WITTER ADVISORS INC.          PRINCIPAL ADDRESS AND NATURE OF CONNECTION
- - --------------------          -------------------------------------------
<S>                           <C>
Richard Felegy
Senior Vice President

Edward F. Gaylor              Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.

Robert S. Giambrone           Senior Vice President of MSDW Services, MSDW 
Senior Vice President         Distributors and MSDW Trust and Director of MSDW Trust;
                              Vice President of the Morgan Stanley Dean Witter Funds
                              and the TCW/DW Funds. 
     
Rajesh Gupta                  Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.

Kenton J. Hinchliffe          Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.

Kevin Hurley                  Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.

Margaret Iannuzzi
Senior Vice President

Jenny Beth Jones              Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.

John B. Kemp, III             President of MSDW Distributors.
Senior Vice President              

Anita H. Kolleeny             Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.    

Jonathan R. Page              Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.

Ira N. Ross                   Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.

Guy G. Rutherfurd, Jr.        Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Rochelle G. Siegel            Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Jayne M. Stevlingson          Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.
</TABLE>


                                      7
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION,
MORGAN STANLEY DEAN           VOCATION WITH OR EMPLOYMENT, INCLUDING NAME,
WITTER ADVISORS INC.          PRINCIPAL ADDRESS AND NATURE OF CONNECTION
- - --------------------          -------------------------------------------
<S>                           <C>
Paul D. Vance                 Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.

Elizabeth A. Vetell 
Senior Vice President

James F. Willison             Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.

Ronald J. Worobel             Vice President of various Morgan Stanley Dean Witter 
Senior Vice President         Funds.

Douglas Brown  
First Vice President

Thomas F. Caloia              First Vice President and Assistant Treasurer of
First Vice President          MSDW Services; Assistant Treasurer of MSDW 
and Assistant                 Distributors; Treasurer and Chief Financial Officer of the
Treasurer                     Morgan Stanley Dean Witter Funds and the TCW/DW Funds.

Thomas Chronert     
First Vice President

Rosalie Clough
First Vice President

Marilyn K. Cranney            Assistant Secretary of DWR; First Vice President and
First Vice President          Assistant Secretary of MSDW Services; Assistant 
and Assistant Secretary       Secretary of the Morgan Stanley Dean Witter Funds and the TCW/DW Funds.

Salvatore DeSteno             Vice President of MSDW Services.
First Vice President

Michael Interrante            First Vice President and Controller of MSDW Services; 
First Vice President          Assistant Treasurer of MSDW Distributors; First Vice
and Controller                President and Treasurer of MSDW Trust. 

David Johnson
First Vice President

Stanley Kapica
First Vice President
</TABLE>


                                       8
<PAGE>
<TABLE>
<CAPTION>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION,
MORGAN STANLEY DEAN           VOCATION WITH OR EMPLOYMENT, INCLUDING NAME,
WITTER ADVISORS INC.          PRINCIPAL ADDRESS AND NATURE OF CONNECTION
- - --------------------          -------------------------------------------
<S>                           <C>
Carsten Otto                  First Vice President and Assistant Secretary of MSDW
First Vice President          Services; Assistant Secretary of the Morgan Stanley
and Assistant Secretary       Dean Witter Funds and the TCW/DW Funds.
     
Robert Zimmerman
First Vice President

Dale Albright
Vice President

Joan G. Allman
Vice President

Andrew Arbenz
Vice President

Joseph Arcieri                Vice President of various Morgan Stanley Dean Witter 
Vice President                Funds.

Nancy Belza
Vice President

Maurice Bendrihem
Vice President and
Assistant Controller

Frank Bruttomesso             Vice President and Assistant Secretary of MSDW 
Vice President and            Services; Assistant Secretary of the Morgan Stanley Dean
                              Assistant Secretary Witter Funds and the TCW/DW Funds.

Ronald Caldwell
Vice President

Joseph Cardwell
Vice President

Philip Casparius
Vice President

Bruce Dunn
Vice President

Michael Durbin
Vice President
</TABLE>

                                      9
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION,
MORGAN STANLEY DEAN           VOCATION WITH OR EMPLOYMENT, INCLUDING NAME,
WITTER ADVISORS INC.          PRINCIPAL ADDRESS AND NATURE OF CONNECTION
- - --------------------          -------------------------------------------
<S>                           <C>
Sheila Finnerty
Vice President

David Dineen                  
Vice President                

Jeffrey D. Geffen
Vice President

Michael Geringer
Vice President

Ellen Gold
Vice President

Stephen Greenhut
Vice President

Sandra Grossman
Vice President

Peter W. Gurman
Vice President

Matthew Haynes                Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.

Peter Hermann                 Vice President of various Morgan Stanley Dean Witter 
Vice President                Funds.

Elizabeth Hinchman
Vice President

David Hoffman
Vice President

Christopher Jones
Vice President

Kevin Jung
Vice President

Carol Espejo Kane
Vice President
</TABLE>


                                     10
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION,
MORGAN STANLEY DEAN           VOCATION WITH OR EMPLOYMENT, INCLUDING NAME,
WITTER ADVISORS INC.          PRINCIPAL ADDRESS AND NATURE OF CONNECTION
- - --------------------          -------------------------------------------
<S>                           <C>
James P. Kastberg
Vice President

Michelle Kaufman              Vice President of various Morgan Stanley Dean Witter   
Vice President                Funds.

Paula LaCosta                 Vice President of various Morgan Stanley Dean Witter 
Vice President                Funds.

Thomas Lawlor
Vice President

Gerard J. Lian                Vice President of various Morgan Stanley Dean Witter   
Vice President                Funds.

Nancy Login
Vice President

Steven MacNamara
Vice President

Catherine Maniscalco          Vice President of Morgan Stanley Dean Witter Natural 
Vice President                Resource Development Securities Inc.

Albert McGarity
Vice President

LouAnne D. McInnis            Vice President and Assistant Secretary of MSDW 
Vice President and            Services; Assistant Secretary of the Morgan Stanley Dean 
Assistant Secretary           Witter Funds and the TCW/DW Funds.

Teresa McRoberts
Vice President

Sharon K. Milligan  
Vice President

Julie Morrone
Vice President

Mary Beth Mueller
Vice President

David Myers                   Vice President of Morgan Stanley Dean Witter Natural 
Vice President                Resource Development Securities Inc.

Richard Norris
Vice President
</TABLE>


                                      11
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION,
MORGAN STANLEY DEAN           VOCATION WITH OR EMPLOYMENT, INCLUDING NAME,
WITTER ADVISORS INC.          PRINCIPAL ADDRESS AND NATURE OF CONNECTION
- - --------------------          -------------------------------------------
<S>                           <C>
George Paoletti
Vice President

Anne Pickrell                 Vice President of various  Morgan Stanley Dean Witter 
Vice President                Funds.

Michael Roan
Vice President

John Roscoe
Vice President

Hugh Rose
Vice President

Robert Rossetti               Vice President of various Morgan Stanley Dean Witter 
Vice President                Funds.

Ruth Rossi                    Vice President and Assistant Secretary of MSDW 
Vice President and            Services; Assistant Secretary of the Morgan Stanley Dean Assistant Secretary
and the TCW/DW Funds.         Witter Funds

Carl F. Sadler
Vice President

Deborah Santaniello
Vice President

Peter J. Seeley               Vice President of various Morgan Stanley Dean Witter 
Vice President                Funds.

Robert Stearns
Vice President

Naomi Stein
Vice President

Kathleen H. Stromberg         Vice President of various Morgan Stanley Dean Witter 
Vice President                Funds.    

Marybeth Swisher
Vice President
</TABLE>


                                       12
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION,
MORGAN STANLEY DEAN           VOCATION WITH OR EMPLOYMENT, INCLUDING NAME,
WITTER ADVISORS INC.          PRINCIPAL ADDRESS AND NATURE OF CONNECTION
- - --------------------          -------------------------------------------
<S>                           <C>
Robert Vanden Assem
Vice President

James P. Wallin
Vice President

Alice Weiss                   Vice President of various Morgan Stanley Dean Witter 
Vice President                Funds.

John Wong
Vice President
</TABLE>

Item 29.    PRINCIPAL UNDERWRITERS

(a)    Morgan Stanley Dean Witter Distributors Inc. ("MSDW Distributors"), a
Delaware corporation, is the principal underwriter of the Registrant. MSDW
Distributors is also the principal underwriter of the following investment
companies:

(1)    Active Assets California Tax-Free Trust
(2)    Active Assets Government Securities Trust
(3)    Active Assets Money Trust
(4)    Active Assets Tax-Free Trust
(5)    Morgan Stanley Dean Witter American Value Fund
(6)    Morgan Stanley Dean Witter Balanced Growth Fund
(7)    Morgan Stanley Dean Witter Balanced Income Fund
(8)    Morgan Stanley Dean Witter California Tax-Free Daily Income Trust
(9)    Morgan Stanley Dean Witter California Tax-Free Income Fund
(10)   Morgan Stanley Dean Witter Capital Appreciation Fund
(11)   Morgan Stanley Dean Witter Capital Growth Securities
(12)   Morgan Stanley Dean Witter Competitive Edge Fund, "BEST IDEAS PORTFOLIO"
(13)   Morgan Stanley Dean Witter Convertible Securities Trust
(14)   Morgan Stanley Dean Witter Developing Growth Securities Trust
(15)   Morgan Stanley Dean Witter Diversified Income Trust 
(16)   Morgan Stanley Dean Witter Dividend Growth Securities Inc.
(17)   Morgan Stanley Dean Witter Equity Fund
(18)   Morgan Stanley Dean Witter European Growth Fund Inc.
(19)   Morgan Stanley Dean Witter Federal Securities Trust
(20)   Morgan Stanley Dean Witter Financial Services Trust
(21)   Morgan Stanley Dean Witter Fund of Funds
(22)   Morgan Stanley Dean Witter Global Dividend Growth Securities
(23)   Morgan Stanley Dean Witter Global Short-Term Income Fund Inc.
(24)   Morgan Stanley Dean Witter Global Utilities Fund
(25)   Morgan Stanley Dean Witter Growth Fund
(26)   Morgan Stanley Dean Witter Hawaii Municipal Trust
(27)   Morgan Stanley Dean Witter Health Sciences Trust
(28)   Morgan Stanley Dean Witter High Yield Securities Inc.


                                          13
<PAGE>

(29)   Morgan Stanley Dean Witter Income Builder Fund
(30)   Morgan Stanley Dean Witter Information Fund
(31)   Morgan Stanley Dean Witter Intermediate Income Securities
(32)   Morgan Stanley Dean Witter International SmallCap Fund
(33)   Morgan Stanley Dean Witter Japan Fund
(34)   Morgan Stanley Dean Witter Limited Term Municipal Trust
(35)   Morgan Stanley Dean Witter Liquid Asset Fund Inc.
(36)   Morgan Stanley Dean Witter Market Leader Trust
(37)   Morgan Stanley Dean Witter Mid-Cap Dividend Growth Securities
(38)   Morgan Stanley Dean Witter Mid-Cap Growth Fund
(39)   Morgan Stanley Dean Witter Multi-State Municipal Series Trust
(40)   Morgan Stanley Dean Witter Natural Resource Development Securities Inc.
(41)   Morgan Stanley Dean Witter New York Municipal Money Market Trust
(42)   Morgan Stanley Dean Witter New York Tax-Free Income Fund
(43)   Morgan Stanley Dean Witter Pacific Growth Fund Inc.
(44)   Morgan Stanley Dean Witter Precious Metals and Minerals Trust
(45)   Morgan Stanley Dean Witter Prime Income Trust
(46)   Morgan Stanley Dean Witter S&P 500 Index Fund
(47)   Morgan Stanley Dean Witter S&P 500 Select Fund
(48)   Morgan Stanley Dean Witter Short-Term Bond Fund
(49)   Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust
(50)   Morgan Stanley Dean Witter Special Value Fund
(51)   Morgan Stanley Dean Witter Strategist Fund 
(52)   Morgan Stanley Dean Witter Tax-Exempt Securities Trust
(53)   Morgan Stanley Dean Witter Tax-Free Daily Income Trust
(54)   Morgan Stanley Dean Witter U.S. Government Money Market Trust
(55)   Morgan Stanley Dean Witter U.S. Government Securities Trust
(56)   Morgan Stanley Dean Witter Utilities Fund
(57)   Morgan Stanley Dean Witter Value-Added Market Series
(58)   Morgan Stanley Dean Witter Value Fund
(59)   Morgan Stanley Dean Witter Variable Investment Series
(60)   Morgan Stanley Dean Witter World Wide Income Trust
(1)    TCW/DW Emerging Markets Opportunities Trust 
(2)    TCW/DW Global Telecom Trust
(3)    TCW/DW Income and Growth
(4)    TCW/DW Latin American Growth Fund
(5)    TCW/DW Mid-Cap Equity Trust
(6)    TCW/DW North American Government Income Trust
(7)    TCW/DW Small Cap Growth Fund
(8)    TCW/DW Total Return Trust 


                                          14
<PAGE>


(b)    The following information is given regarding directors and officers of
MSDW Distributors not listed in Item 28 above.  The principal address of MSDW
Distributors is Two World Trade Center, New York, New York 10048.  None of the
following persons has any position or office with the Registrant.

<TABLE>
<CAPTION>
Name                     Positions and Office with MSDW Distributors 
- - ----                     --------------------------------------------
<S>                      <C>
Christine Edwards        Executive Vice President, Secretary, Director and Chief
Legal                    Officer. 

Michael T. Gregg         Vice President and Assistant Secretary.

James F. Higgins         Director

Fredrick K. Kubler       Senior Vice President, Assistant Secretary and Chief 
                         Compliance Officer.

Philip J. Purcell        Director

John Schaeffer           Director

Charles Vidala           Senior Vice President and Financial Principal
</TABLE>

Item 30.  LOCATION OF ACCOUNTS AND RECORDS

       All accounts, books and other documents required to be maintained by
Section 31(a) of the Investment Company Act of 1940 and the Rules thereunder are
maintained by the Investment Manager at its offices, except records relating to
holders of shares issued by the Registrant, which are maintained by the
Registrant's Transfer Agent, at its place of business as shown in the
prospectus.

Item 31.  MANAGEMENT SERVICES

       Registrant is not a party to any such management-related service
contract.

Item 32.  MANAGEMENT SERVICES

       Registrant is not a party to any such management-related service
contract.

Item 33.  UNDERTAKINGS

       Registrant hereby undertakes to furnish each person to whom a prospectus
is delivered with a copy of the Registrant's latest annual report to
shareholders, upon request and without charge.


                                          15
<PAGE>

                                      SIGNATURES
   
     Pursuant to the requirements of the Securities Act of 1933, as amended,  
and the Investment Company Act of 1940, as amended, the Registrant has duly 
caused this Registration Statement to be signed on its behalf by the 
undersigned, thereunto duly authorized, in the City of New York and the State 
of New York on the 20th day of November, 1998.
    
                         MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
                                   By:   /s/ Barry Fink
                                       ----------------
                                             Barry Fink
                                   Vice President and Secretary

     Pursuant to the requirements of the Securities Act of 1933, as amended, 
this Registration Statement has been signed below by the following persons in 
the capacities and on the date indicated.

   
     Signatures                         Title                         Date 
     ----------                         -----                         ----

By:  /s/ Charles A. Fiumefreddo         Chairman, President,          11/20/98 
     -----------------------------      Chief Executive
         Charles A. Fiumefreddo         Officer and Trustee

By:  /s/ Michael Bozic                  Trustee                       11/20/98
     -----------------------------
         Michael Bozic

By:  /s/ Edwin J. Garn                  Trustee                       11/20/98
     -----------------------------
         Edwin J. Garn

By:  /s/ John R. Haire                  Trustee                       11/20/98
     -----------------------------
         John R. Haire 

By:  /s/ Wayne E. Hedien                Trustee                       11/20/98
    -----------------------------
         Wayne E. Hedien

By:  /s/ Manuel H. Johnson              Trustee                       11/20/98
    -----------------------------
         Manuel H. Johnson

By:  /s/ Michael E. Nugent              Trustee                       11/20/98
    -----------------------------
         Michael E. Nugent

By:  /s/ Philip J. Purcell              Trustee                       11/20/98
    -----------------------------
         Philip J. Purcell

By:  /s/ John L. Schroeder              Trustee                       11/20/98
    -----------------------------
         John L. Schroeder

By:  /s/ Thomas F. Caloia               Treasurer, Chief              11/20/98
    -----------------------------       Financial Officer and 
         Thomas F. Caloia               Chief Accounting Officer

    
<PAGE>

                                    EXHIBIT INDEX


     1.     Form of Amendment to the Declaration of Trust of the Registrant.

     7.     Form of Amended Investment Advisory Agreement between the 
            Registrant and Morgan Stanley Dean Witter Advisors Inc.

     10.    Form of Amended and Restated Transfer Agency and Service Agreement 
            between the Registrant and Morgan Stanley Dean Witter Trust FSB 

     12.(a) Opinion of Barry Fink, Esq.

     12.(b) Opinion of Lane Altman & Owens LLP.

     14.  Consent of Independent Accountants.

     15.  Schedule for Computations of Performance Quotations.

     18.  Financial Data Schedule as of September 30, 1998.

  Other.  Powers of Attorney


<PAGE>



                                    CERTIFICATE


            The undersigned hereby certifies that he is the Secretary of 
Prime Income Trust (the "Trust"), an unincorporated business trust organized 
under the laws of the Commonwealth of Massachusetts, that annexed hereto is 
an Amendment to the Declaration of Trust of the Trust adopted by the Trustees 
of the Trust on April 30, 1998 as provided in Section 8.3 of the said 
Declaration, said Amendment to take effect on June 22, 1998, and I do hereby 
further certify that such amendment has not been amended and is on the date 
hereof in full force and effect.

            Dated this 22nd day of June, 1998.




                                     -----------------------------------
                                     Barry Fink
                                     Secretary 

<PAGE>


                                      AMENDMENT





Dated:                June 22, 1998

To be Effective:      June 22, 1998





                                         TO
                                          
                                 PRIME INCOME TRUST
                                          
                                DECLARATION OF TRUST
                                          
                                       DATED
                                          
                                  AUGUST 17, 1989

<PAGE>

              Amendment dated June 22, 1998 to the Declaration of Trust
               (the "Declaration") of Prime Income Trust (the "Trust")
                                dated August 17, 1989


            WHEREAS, the Trust was established by the Declaration on the date 
hereinabove set forth under the laws of the Commonwealth of Massachusetts; and
            
            WHEREAS, the Trustees of the Trust have deemed it advisable to 
change the name of the Trust to "Morgan Stanley Dean Witter Prime Income 
Trust," such change to be effective on June 22 ,1998;

NOW, THEREFORE:

            1.  Section 1.1 of Article I of the Declaration is hereby amended 
so that that Section shall read in its entirety as follows:

                 "Section 1.1. NAME.  The name of the Trust created hereby is
                 the Morgan Stanley Dean Witter Prime Income Trust and so far as
                 may be practicable the Trustees shall conduct the Trust's
                 activities, execute all documents and sue or be sued under that
                 name, which name (and the word "Trust" whenever herein used)
                 shall refer to the Trustees as Trustees, and not as
                 individuals, or personally, and shall not refer to the
                 officers, agents, employees or Shareholders of the Trust. 
                 Should the Trustees determine that the use of such name is not
                 advisable, they may use such other name for the Trust as they
                 deem proper and the Trust may hold its property and conduct its
                 activities under such other name."

            2.  Subsection (n) of Section 1.2 of Article I of the Declaration 
is hereby amended so that that subsection shall read in its entirety as 
follows:

                 "Section 1.2. DEFINITIONS...
                 
                 "(n) "TRUST" means the Morgan Stanley Dean Witter Prime Income
                 Trust."
                 
            3.  The Declaration is hereby amended to add a new Section 10.7 
to read in its entirety as follows:

                 "Section 10.7. USE OF THE NAME "MORGAN STANLEY DEAN WITTER."
                 Morgan Stanley Dean Witter & Co. ("MSDW") has consented to the
                 use by the Trust of the identifying name "Morgan Stanley Dean
                 Witter," which is a property right of MSDW.  The Trust will
                 only use the name "Morgan Stanley Dean Witter" as a component
                 of its
<PAGE>

                 name and for no other purpose, and will not purport to grant to
                 any third party the right to use the name "Morgan Stanley Dean
                 Witter" for any purpose.  MSDW, or any corporate affiliate of
                 MSDW, may use or grant to others the right to use the name
                 "Morgan Stanley Dean Witter," or any combination or
                 abbreviation thereof, as all or a portion of a corporate or
                 business name or for any commercial purpose, including a grant
                 of such right to any other investment company.  At the request
                 of MSDW or any corporate affiliate of MSDW, the Trust will
                 take such action as may be required to provide its consent to
                 the use of the name "Morgan Stanley Dean Witter," or any
                 combination or abbreviation thereof, by MSDW or any corporate
                 affiliate of MSDW, or by any person to whom MSDW or a corporate
                 affiliate of MSDW shall have granted the right to such use.
                 Upon the termination of any investment advisory agreement into
                 which a corporate affiliate of MSDW and the Trust may enter,
                 the Trust shall, upon request of MSDW or any corporate
                 affiliate of MSDW, cease to use the name "Morgan Stanley Dean
                 Witter" as a component of its name, and shall not use the name,
                 or any combination or abbreviation thereof, as part of its name
                 or for any other commercial purpose, and shall cause its
                 officers, Trustees and Shareholders to take any and all actions
                 which MSDW or any corporate affiliate of MSDW may request to
                 effect the foregoing and to reconvey to MSDW any and all rights
                 to such name."
                 
            4. The Trustees of the Trust hereby reaffirm the Declaration, as 
amended, in all respects.

            5.  This Amendment may be executed in more than one counterpart, 
each of which shall be deemed an original, but all of which together shall 
constitute one and the same document.

<PAGE>


  IN WITNESS WHEREOF, the undersigned, the Trustees of the Trust, have 
executed this instrument this 22nd day of June, 1998. 

/s/ Michael Bozic                            /s/ Manuel H. Johnson
- - -----------------------------------          ---------------------------------
Michael Bozic, as Trustee                    Manuel H. Johnson, as Trustee   
and not individually                         and not individually
c/o Levitz Furniture Corp.                   c/o Johnson Smick International
Inc.
6111 Broken Sound Parkway, NW                1133 Connecticut Avenue, NW  
Boca Raton, FL  33487                        Washington, D.C.  20036



/s/ Charles A. Fiumefreddo                   /s/ Michael E. Nugent
- - -----------------------------------          ---------------------------------
Charles A. Fiumefreddo, as Trustee           Michael E. Nugent, as Trustee
and not individually                         and not individually
Two World Trade Center                       c/o Triumph Capital, L.P.
New York, NY  10048                          237 Park Avenue
                                             New York, NY  10017



/s/ Edwin J. Garn                            /s/ Philip J. Purcell
- - -----------------------------------          ---------------------------------
Edwin J. Garn, as Trustee                    Philip J. Purcell, as Trustee
and not individually                         and not individually
c/o Huntsman Corporation                     1585 Broadway
500 Huntsman Way                             New York, NY  10036
Salt Lake City, UT  84111



/s/ John R. Haire                            /s/ John L. Schroeder
- - -----------------------------------          ---------------------------------
John R. Haire, as Trustee                    John L. Schroeder, as Trustee
and not individually                         and not individually
Two World Trade Center                       c/o Gordon Altman Butowsky Weitzen
New York, NY  10048                          Shalov & Wein 
                                             Counsel to the Independent Trustees
                                             114 West 47th Street
                                             New York, NY 10036
/s/ Wayne E. Hedien   
- - -----------------------------------           
Wayne E. Hedien, as Trustee
and not individually
c/o Gordon Altman Butowsky Weitzen
  Shalov & Wein 
Counsel to the Independent Trustees
114 West 47th Street
New York, NY  10036
<PAGE>

STATE OF NEW YORK     )
                      )ss.:
COUNTY OF NEW YORK    )
                 
                 
On this 22nd day of June, 1998, MICHAEL BOZIC, CHARLES A. FIUMEFREDDO, EDWIN 
J. GARN, JOHN R. HAIRE, WAYNE E. HEDIEN, MANUEL H. JOHNSON, MICHAEL E. 
NUGENT, PHILIP J. PURCELL and JOHN L. SCHROEDER, known to me to be the 
individuals described in and who executed the foregoing instrument, 
personally appeared before me and they severally acknowledged the foregoing 
instrument to be their free act and deed.
                 
                 
                 
                 
                 
                                                    /s/ Marilyn K. Cranney
                                                    ----------------------
                                                             Notary Public
                 
                 
MARILYN K. CRANNEY
NOTARY PUBLIC, State of New York
No. 24-4795538
Qualified in Kings County
Commission Expires May 31, 1999

<PAGE>

                         INVESTMENT ADVISORY AGREEMENT

     AGREEMENT made as of the 31st day of May, 1997, and amended as of May 1,
1998, by and between Prime Income Trust, an unincorporated business trust
organized under the laws of the Commonwealth of Massachusetts (hereinafter
called the "Fund"), and Dean Witter InterCapital Inc., a Delaware corporation
(hereinafter called the "Investment Adviser"):

     WHEREAS, The Fund is engaged in business as a closed-end management
investment company and is registered as such under the Investment Company Act
of 1940, as amended (the "Act"); and

     WHEREAS, The Investment Adviser is registered as an investment adviser
under the Investment Advisers Act of 1940 (the "Advisers Act"), and engages in
the business of acting as investment adviser; and

     WHEREAS, The Fund desires to retain the Investment Adviser to render
investment advisory services in the manner and on the terms and conditions
hereinafter set forth; and

     WHEREAS, The Investment Adviser desires to be retained to perform services
on said terms and conditions:

     Now, Therefore, this Agreement

                              W I T N E S S E T H:

     That in consideration of the premises and the mutual covenants hereinafter
contained, the Fund and the Investment Adviser agree as follows:

     1. The Fund hereby retains the Investment Adviser to act as investment
manager of the Fund and, subject to the supervision of the Trustees of the Fund
(the "Trustees"), to supervise the investment activities of the Fund as
hereinafter set forth. Without limiting the generality of the foregoing, the
Investment Adviser shall obtain and evaluate such information and advice
relating to the economy, securities and commodities markets and securities and
commodities as it deems necessary or useful to discharge its duties hereunder;
shall continuously manage the assets of the Fund in a manner consistent with
the investment objectives and policies of the Fund; shall determine the
securities and commodities to be purchased, sold or otherwise disposed of by
the Fund and the timing of such purchases, sales and dispositions; and shall
take such further action, including the placing of purchase and sale orders on
behalf of the Fund, as the Investment Adviser shall deem necessary or
appropriate. The Investment Adviser shall also furnish to or place at the
disposal of the Fund such of the information, evaluations, analyses and
opinions formulated or obtained by the Investment Adviser in the discharge of
its duties as the Fund may, from time to time, reasonably request.

     2. The Investment Adviser shall, at its own expense, maintain such staff
and employ or retain such personnel and consult with such other persons as it
shall from time to time determine to be necessary or useful to the performance
of its obligations under this Agreement. Without limiting the generality of the
foregoing, the staff and personnel of the Investment Adviser shall be deemed to
include persons employed or otherwise retained by the Investment Adviser to
furnish statistical and other factual data, advice regarding economic factors
and trends, information with respect to technical and scientific developments,
and such other information, advice and assistance as the Investment Adviser may
desire. The Investment Adviser shall, as agent for the Fund, maintain the
Fund's records required in connection with the performance of its obligations
under this Agreement and required to be maintained under the Act. All such
records so maintained shall be the property of the Fund and, upon request
therefor, the Investment Adviser shall surrender to the Fund such of the
records so requested.

     3. The Fund will, from time to time, furnish or otherwise make available
to the Investment Adviser such financial reports, proxy statements and other
information relating to the business and affairs of the Fund as the Investment
Adviser may reasonably require in order to discharge its duties and obligations
hereunder.

     4. The Investment Adviser shall bear the cost of rendering the investment
advisory services to be performed by it under this Agreement, and shall, at its
own expense, pay the compensation of its officers and employees, if any, who
are also officers of the Fund.


C66728--PRIMINCT
<PAGE>

     5. The Fund assumes and shall pay or cause to be paid all other expenses
of the Fund, including without limitation: the charges and expenses of any
registrar, any custodian or depository appointed by the Fund for the
safekeeping of its cash, portfolio securities or commodities and other
property, and any stock transfer or dividend agent or agents appointed by the
Fund; brokers' commissions chargeable to the Fund in connection with portfolio
transactions to which the Fund is a party; all taxes, including securities or
commodities issuance and transfer taxes, and fees payable by the Fund to
federal, state or other governmental agencies; the cost and expense of
engraving or printing certificates representing shares of the Fund; all costs
and expenses in connection with the registration and maintenance of
registration of the Fund and its shares with the Securities and Exchange
Commission and various states and other jurisdictions (including filing fees
and legal fees and disbursements of counsel and the costs and expenses of
preparing, printing, including typesetting, and distributing prospectuses for
such purposes); all expenses of shareholders' and Trustees' meetings and of
preparing, printing and mailing proxy statements and reports to shareholders;
fees and travel expenses of Trustees or members of any advisory board or
committee who are not employees of the Investment Adviser or the Fund's
administrator or any corporate affiliate of either of them; all expenses
incident to the payment of any dividend or distribution program; charges and
expenses of any outside service used for pricing of the Fund's shares; charges
and expenses of legal counsel, including counsel to the Trustees of the Fund
who are not interested persons (as defined in the Act) of the Fund or the
Investment Adviser or the Fund's administrator, and of independent accountants,
in connection with any matter relating to the Fund; membership dues of industry
associations; interest payable on Fund borrowings; fees and expenses incident
to the listing of the Fund's shares on any stock exchange; postage; insurance
premiums on property or personnel (including officers and Trustees) of the Fund
which inure to its benefit; extraordinary expenses (including but not limited
to legal claims and liabilities and litigation costs and any indemnification
related thereto); and all other charges and costs of the Fund's operation
unless otherwise explicitly provided herein.

     6. For the services to be rendered by the Investment Adviser, the Fund
shall pay to the Investment Adviser monthly compensation determined by applying
the following annual rates to the Fund's average daily net assets: 0.90% of
daily net assets up to $500 million; 0.85% of the next $1 billion; and 0.825%
of daily net assets over $1.5 billion. Such calculations shall be made by
applying 1/365ths of the annual rate to the Fund's net assets each day
determined as of the close of business on that day or the last previous
business day. If this Agreement becomes effective subsequent to the first day
of a month or shall terminate before the last day of a month, compensation for
the part of the month this Agreement is in effect shall be prorated in a manner
consistent with the calculation of the fees as set forth above.

     7. In the event the operating expenses of the Fund, including amounts
payable to the Investment Adviser pursuant to paragraph 6 hereof, for any
fiscal year ending on a date on which this Agreement is in effect, exceed the
expense limitations applicable to the Fund imposed by state securities laws or
regulations thereunder, as such limitations may be raised or lowered from time
to time, the Investment Adviser shall reduce its advisory fee to the extent of
such excess and, if required, pursuant to any such laws or regulations, will
reimburse the Fund or annual operating expenses in excess of any expense
limitation that may be applicable; provided, however, there shall be excluded
from such expenses the amount of any interest, taxes, brokerage commissions and
extraordinary expenses (including but not limited to legal claims and
liabilities and litigations costs and any indemnification related thereto) paid
or payable by the Fund. Such reduction, if any, shall be computed and accrued
weekly, shall be settled on a monthly basis, and shall be based upon the
expense limitation applicable to the Fund as at the end of the last business
day of the month. Should two or more such expense limitations be applicable as
at the end of the last full week of the month, that expense limitation which
results in the largest reduction in the Investment Adviser's fees shall be
applicable.

     For purposes of this provision, should any applicable expense limitation
be based upon the gross income of the Fund, such gross income shall include,
but not be limited to, interest on debt securities in the Fund's portfolio
accrued to and including the last day of the Fund's fiscal year, and dividends
declared on equity securities in the Fund's portfolio, the record dates for
which fall on or prior to the last day of such fiscal year, but shall not
include gains from the sale of securities.


                                       2
<PAGE>

     8. The Investment Adviser will use its best efforts in the management of
the investment activities of the Fund, but in the absence of willful
misfeasance, bad faith, gross negligence or reckless disregard of its
obligations hereunder, the Investment Adviser shall not be liable to the Fund
or any of its investors for any error of judgment or mistake of law or for any
act or omission by the Investment Adviser or for any losses sustained by the
Fund or its investors.


     9. Nothing contained in this Agreement shall prevent the Investment
Adviser or any affiliated person of the Investment Adviser from acting as
investment adviser or manager for any other person, firm or corporation
(including any other investment company), whether or not the investment
objectives or policies of any such other person, firm or corporation are
similar to those of the Fund, and shall not in any way bind or restrict the
Investment Adviser or any such affiliated person from buying, selling or
trading any securities or commodities for their own accounts or for the account
of others for whom the Investment Adviser or any such affiliated person may be
acting. Nothing in this Agreement shall limit or restrict the right of any
Trustee, officer or employee of the Investment Adviser to engage in any other
business or to devote his or her time and attention in part to the management
or other aspects of any other business whether of a similar or dissimilar
nature.


     10. This Agreement shall remain in effect until April 30, 1999 and from
year to year thereafter provided such continuance is approved at least annually
by the vote of holders of a majority, as defined in the Act, of the outstanding
voting securities of the Fund or by the Board of Trustees of the Fund; provided
that in either event such continuance is also approved annually by the vote of
a majority of the Trustees of the Fund who are not parties to this Agreement or
"interested persons" (as defined in the Act) of any such party, which vote must
be cast in person at a meeting called for the purpose of voting on such
approval; provided, however, that: (a) the Fund may, at any time and without
the payment of any penalty, terminate this Agreement upon thirty days' written
notice to the Investment Adviser, either by majority vote of the Trustees of
the Fund or by the vote of a majority of the outstanding voting securities of
the Fund; (b) this Agreement shall immediately terminate in the event of its
assignment (to the extent required by the Act and the rules thereunder) unless
such automatic terminations shall be prevented by an exemptive order of the
Securities and Exchange Commission; and (c) the Investment Adviser may
terminate this Agreement without payment of penalty on thirty days' written
notice to the Fund. Any notice under this Agreement shall be given in writing,
addressed and delivered, or mailed postpaid, to the other party at the
principal office of such party.


     11. This Agreement may be amended by the parties without the vote or
consent of the shareholders of the Fund to supply any omission, to cure,
correct or supplement any ambiguous, defective or inconsistent provision
hereof, or if they deem it necessary to conform this Agreement to the
requirements of applicable federal laws or regulations, but neither the Fund
nor the Investment Adviser shall be liable for failing to do so.


     12. This Agreement shall be construed in accordance with the laws of the
State of New York and the applicable provisions of the Act. To the extent the
applicable law of the State of New York, or any of the provisions herein,
conflicts with the applicable provisions of the Act, the Advisers Act or any
rules, regulations or orders of the Securities and Exchange Commission, the
latter shall control.


     13. The Declaration of Trust establishing Prime Income Trust, dated
August 17, 1989, a copy of which, together with all amendments thereto (the
"Declaration"), is on file in the office of the Secretary of the Commonwealth
of Massachusetts, provides that the name Prime Income Trust refers to the
Trustees under the Declaration collectively as Trustees, but not as individuals
or personally; and no Trustee, shareholder, officer, employee or agent of Prime
Income Trust shall be held to any personal liability, nor shall resort be had
to their private property for the satisfaction of any obligation or claim or
otherwise, in connection with the affairs of said Prime Income Trust, but the
Trust Estate only shall be liable.


                                       3
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement, as amended, on May 1, 1998 in New York, New York.


                                          PRIME INCOME TRUST




                                          By:
                                             ---------------------------------




Attest:

- - ----------------------------------


                                          DEAN WITTER INTERCAPITAL INC.




                                          By:
                                             ---------------------------------



Attest:

- - ----------------------------------


                                       4

<PAGE>



                                 AMENDED AND RESTATED
                        TRANSFER AGENCY AND SERVICE AGREEMENT

                                         with

                         MORGAN STANLEY DEAN WITTER TRUST FSB


















                                                              [closed-end funds]

<PAGE>

                                 TABLE OF CONTENTS
     
                                                                          Page  
                                                                          ----

Article 1      Terms of Appointment. . . . . . . . . . . . . . . . . . . .1

Article 2      Fees and Expenses . . . . . . . . . . . . . . . . . . . . .4

Article 3      Representations and Warranties of MSDW TRUST. . . . . . . .5

Article 4      Representations and Warranties of the Fund. . . . . . . . .5

Article 5      Duty of Care and Indemnification. . . . . . . . . . . . . .6

Article 6      Documents and Covenants of the Fund and MSDW TRUST. . . . .9

Article 7      Duration and Termination of Agreement . . . . . . . . . . 12

Article 8      Assignment. . . . . . . . . . . . . . . . . . . . . . . . 13

Article 9      Affiliations. . . . . . . . . . . . . . . . . . . . . . . 13

Article 10     Amendment . . . . . . . . . . . . . . . . . . . . . . . . 14

Article 11     Applicable Law. . . . . . . . . . . . . . . . . . . . . . 14

Article 12     Miscellaneous . . . . . . . . . . . . . . . . . . . . . . 14

Article 13     Merger of Agreement . . . . . . . . . . . . . . . . . . . 16

Article 14     Personal Liability. . . . . . . . . . . . . . . . . . . . 16

<PAGE>


                                         -i-

<PAGE>

             AMENDEND AND RESTATED TRANSFER AGENCY AND SERVICE AGREEMENT


          AMENDED AND RESTATED AGREEMENT made as of the 22nd day of June, 1998
by and between each of the Funds listed on the signature page hereof, each of
such Funds acting severally on its own behalf and not jointly with any of such
other Funds (each such Fund hereinafter referred to as the "Fund"), each such
Fund having its principal office and place of business at Two World Trade
Center, New York, New York, 10048, and MORGAN STANLEY DEAN WITTER TRUST FSB
("MSDW TRUST"), a federally chartered savings bank, having its principal office
and place of business at Harborside Financial Center, Plaza Two, Jersey City,
New Jersey 07311.

          WHEREAS, the Fund desires to appoint MSDW TRUST as its transfer agent,
dividend disbursing agent, shareholder servicing agent, registrar and agent in
connection with the Fund's Dividend Reinvestment Plan and MSDW TRUST desires to
accept such appointment;

          NOW THEREFORE, in consideration of the mutual covenants herein
contained, the parties hereto agree as follows:

Article 1      TERMS OF APPOINTMENT; DUTIES OF MSDW TRUST

               1.1  Subject to the terms and conditions set forth in this
Agreement, the Fund hereby employs and appoints MSDW TRUST to act as, and MSDW
TRUST agrees to act as, the transfer agent for each series and class of shares
of the Fund ("Shares"), dividend disbursing agent, shareholder servicing agent,
registrar and agent in connection with the Fund's Dividend Reinvestment Plan
(the "Plan").

<PAGE>

               1.2  MSDW TRUST agrees that it will perform the following
services:

               (a)    In accordance with procedures established from time to
time by agreement between the Fund and MSDW TRUST shall:

               (i)    In accordance with instructions from the Fund given by
Certificate of the Secretary of the Fund, issue Shares upon receipt of payment
therefor, and issue certificates therefore or hold such Shares in book form in
the appropriate Shareholder account;

               (ii)   Effect transfers of Shares by the registered owners
thereof upon receipt of appropriate instructions;

               (iii)  Prepare and transmit payments for dividends and
distributions declared by the Fund in accordance with instructions and serve as
the plan agent for the Plan and purchase and issue shares in accordance with
such Plan;


               (iv)   Maintain records of account for and advise the Fund and
its Shareholders as to the foregoing;

               (v)    Record the issuance of Shares of the Fund and maintain
pursuant to Rule 17Ad-10(e) under the Securities Exchange Act of 1934 ("1934
Act") a record of the total number of Shares of the Fund which are authorized,
based upon data provided to it by the Fund, and issued and outstanding.  MSDW
TRUST shall also provide to the Fund on a regular basis the total number of
Shares which are authorized, issued and outstanding and shall notify the Fund in


                                         -2-
<PAGE>

case any proposed issue of Shares by the Fund would result in an overissue.  In
case any issue of Shares would result in an overissue, MSDW TRUST shall refuse
to issue such Shares and shall not countersign and issue any certificates
requested for such Shares.  When recording the issuance of Shares, MSDW TRUST
shall have no obligation to take cognizance of any Blue Sky laws relating to the
issue of sale of such Shares, which functions shall be the sole responsibility
of the Fund. 

               (b)    In addition to and not in lieu of the services set forth
in the above paragraph (a), MSDW TRUST shall:

               (i)    perform all of the customary services of a transfer
agent, dividend disbursing agent, registrar and, as relevant, shareholder
servicing agent, including but not limited to, maintaining all Shareholder
accounts, preparing Shareholder meeting lists, mailing proxies, receiving and
tabulating proxies, mailing shareholder reports, withholding taxes on U.S.
resident and non-resident alien accounts, preparing and filing appropriate forms
required with respect to dividends and distributions by federal tax authorities
for all Shareholders, and providing Shareholder account information;

               (ii)   open any and all bank accounts which may be necessary or
appropriate in order to provide the foregoing services; and

               (iii)  provide a system that will enable the Fund to monitor the
total number of Shares sold in each State or other jurisdiction.


               (c)    MSDW TRUST shall provide such additional services and
functions not specifically described herein as may be mutually agreed between
MSDW TRUST and the


                                         -3-
<PAGE>

Fund.  Procedures applicable to such services may be established from time to
time by agreement between the Fund and MSDW TRUST.

Article 2      FEES AND EXPENSES

               2.1  For performance by MSDW TRUST pursuant to this Agreement,
each Fund agrees to pay MSDW TRUST an annual maintenance fee for each
Shareholder account and certain transactional fees, if applicable, as set out in
the respective fee schedule attached hereto as Schedule A.  Such fees and
out-of-pocket expenses and advances identified under Section 2.2 below may be
changed from time to time subject to mutual written agreement between the Fund
and MSDW TRUST.

               2.2  In addition to the fees paid under Section 2.1 above, the
Fund agrees to reimburse MSDW TRUST for out-of-pocket expenses or advances
incurred by MSDW TRUST in connection with the services rendered by MSDW TRUST
hereunder.  In addition, any other expenses incurred by MSDW TRUST at the
request or with the consent of the Fund will be reimbursed by the Fund.

               2.3  The Fund agrees to pay all fees and reimbursable expenses
within a reasonable period of time following the mailing of the respective
billing notice.  Postage for mailing of dividends, proxies, Fund reports and
other mailings to all Shareholder accounts shall be advanced to MSDW TRUST by
the Fund upon request prior to the mailing date of such materials.


                                         -4-
<PAGE>

Article 3      REPRESENTATIONS AND WARRANTIES OF MSDW TRUST

               MSDW TRUST represents and warrants to the Fund that:

               3.1  It is a federally chartered savings bank whose principal
office is in New Jersey.

               3.2  It is and will remain registered with the U.S. Securities
and Exchange Commission ("SEC") as a Transfer Agent pursuant to the requirements
of Section 17A of the 1934 Act.

               3.3  It is empowered under applicable laws and by its charter and
By-Laws to enter into and perform this Agreement.

               3.4  All requisite corporate proceedings have been taken to
authorize it to enter into and perform this Agreement.

               3.5  It has and will continue to have access to the necessary
facilities, equipment and personnel to perform its duties and obligations under
this Agreement.

               3.6  It complies and will continue to comply with New York Stock
Exchange Rule 496.

Article 4      REPRESENTATIONS AND WARRANTIES OF THE FUND

               The Fund represents and warrants to MSDW TRUST that:

               4.1  It is a corporation duly organized and existing and in good
standing


                                         -5-
<PAGE>

under the laws of Maryland or a trust duly organized and existing and in good
standing under the laws of Massachusetts, as the case may be.

               4.2  It is empowered under applicable laws and by its Articles of
Incorporation or Declaration of Trust, as the case may be, and under its By-Laws
to enter into and perform this Agreement.

               4.3  All corporate proceedings necessary to authorize it to enter
into and perform this Agreement have been taken.

               4.4  It is a closed-end investment company registered with the
SEC under the Investment Company Act of 1940, as amended (the "1940 Act").

Article 5      DUTY OF CARE AND INDEMNIFICATION

               5.1  MSDW TRUST shall not be responsible for, and the Fund shall
indemnify and hold MSDW TRUST harmless from and against, any and all losses,
damages, costs, charges, counsel fees, payments, expenses and liability arising
out of or attributable to:

               (a)  All actions of MSDW TRUST or its agents or subcontractors
required to be taken pursuant to this Agreement, provided that such actions are
taken in good faith and without negligence or willful misconduct.

               (b)  The Fund's refusal or failure to comply with the terms of
this Agreement, or which arise out of the Fund's lack of good faith, negligence
or willful misconduct


                                         -6-
<PAGE>

or which arise out of breach of any representation or warranty of the Fund
hereunder.

               (c)  The reliance on or use by MSDW TRUST or its agents or
subcontractors of information, records and documents which (i) are received by
MSDW TRUST or its agents or subcontractors and furnished to it by or on behalf
of the Fund, and (ii) have been prepared and/or maintained by the Fund or any
other person of firm on behalf of the Fund.

               (d)  The reliance on, or the carrying out by MSDW TRUST or its
agents or subcontractors of, any instructions or requests of the Fund.

               (e)  The offer or sale of Shares in violation of any requirement
under the federal securities laws or regulations or the securities or Blue Sky
laws of any State or other jurisdiction that such Shares be registered in such
State or other jurisdiction or in violation of any stop order or other
determination or ruling by any federal agency or any State or other jurisdiction
with respect to the offer or sale of such Shares in such State or other
jurisdiction.

               5.2  MSDW TRUST shall indemnify and hold the Fund harmless from
or against any and all losses, damages, costs, charges, counsel fees, payments,
expenses and liability arising out of or attributable to any action or failure
or omission to act by MSDW TRUST as a result of the lack of good faith,
negligence or willful misconduct of MSDW TRUST, its officers, employees or
agents.

               5.3  At any time MSDW TRUST may apply to any officer of the Fund
for instructions, and may consult with legal counsel to the Fund, with respect
to any matter arising in


                                         -7-
<PAGE>

connection with the services to be performed by MSDW TRUST under this Agreement,
and MSDW TRUST and its agents or subcontractors shall not be liable and shall be
indemnified by the Fund for any action taken or omitted by it in reliance upon
such instructions or upon the opinion of such counsel.  MSDW TRUST, its agents
and subcontractors shall be protected and indemnified in acting upon any paper
or document furnished by or on behalf of the Fund, reasonably believed to be
genuine and to have been signed by the proper person or persons, or upon any
instruction, information, data, records or documents provided to MSDW TRUST or
its agents or subcontractors by machine readable input, telex, CRT data entry or
other similar means authorized by the Fund, and shall not be held to have notice
of any change of authority of any person, until receipt of written notice
thereof from the Fund.  MSDW TRUST, its agents and subcontractors shall also be
protected and indemnified in recognizing stock certificates which are reasonably
believed to bear the proper manual or facsimile signature of the officers of the
Fund, and the proper countersignature of any former transfer agent or registrar,
or of a co-transfer agent or co-registrar.

               5.4    In the event either party is unable to perform its
obligations under the terms of this Agreement because of acts of God, strikes,
equipment or transmission failure or damage reasonably beyond its control, or
other causes reasonably beyond its control, such party shall not be liable for
damages to the other for any damages resulting from such failure to perform or
otherwise from such causes.


                                         -8-
<PAGE>

               5.5    Neither party to this Agreement shall be liable to the
other party for consequential damages under any provision of this Agreement or
for any act or failure to act hereunder.

               5.6    In order that the indemnification provisions contained in
this Article 5 shall apply, upon the assertion of a claim for which either party
may be required to indemnify the other, the party seeking indemnification shall
promptly notify the other party of such assertion, and shall keep the other
party advised with respect to all developments concerning such claim.  The party
who may be required to indemnify shall have the option to participate with the
party seeking indemnification in the defense of such claim.  The party seeking
indemnification shall in no case confess any claim or make any compromise in any
case in which the other party may be required to indemnify it except with the
other party's prior written consent.

Article 6      DOCUMENTS AND COVENANTS OF THE FUND AND MSDW TRUST

               6.1  The Fund shall promptly furnish to MSDW TRUST the following,
unless previously furnished to Dean Witter Trust Company, the prior transfer
agent of the Fund:

               (a)    If a corporation:

               (i)    A certified copy of the resolution of the Board of
Directors of the Fund authorizing the appointment of MSDW TRUST and the
execution and delivery of this Agreement;


                                         -9-
<PAGE>

               (ii)   A certified copy of the Articles of Incorporation and
By-Laws of the Fund and all amendments thereto;

               (iii)  Certified copies of each vote of the Board of Directors
designating persons authorized to give instructions on behalf of the Fund and
signature cards bearing the signature of any officer of the Fund or any other
person authorized to sign written instructions on behalf of the Fund.

               (iv)   A specimen of the certificate for Shares of the Fund in
the form approved by the Board of Directors, with a certificate of the Secretary
of the Fund as to such approval;

               (b)    If a business trust:

               (i)    a certified copy of the resolution of the Board of
Trustees of the Fund authorizing the appointment of MSDW TRUST and the execution
and delivery of this agreement;

               (ii)   A certified copy of the Declaration of Trust and By-Laws
of the Fund and all amendments thereto;

               (iii)  Certified copies of each vote of the Board of Trustees
designating persons authorized to give instructions on behalf of the Fund and
signature cards bearing the signature of any officer of the Fund or any other
person authorized to sign written instructions on behalf of the Fund;


                                         -10-
<PAGE>

               (iv)   A specimen of the certificate for Shares of the Fund in
the form approved by the Board of Trustees, with a certificate of the Secretary
of the Fund as to such approval;

               (c)    The registration statements and any amendments and
supplements thereto filed with the SEC pursuant to the requirements of the 1933
Act and the 1940 Act;

               (d)    All account application forms, if any, or other documents
relating to Shareholder accounts and/or relating to any dividend reinvestment
plan or other service offered or to be offered by the Fund; and

               (e)    Such other certificates, documents or opinions as MSDW
TRUST deems to be appropriate or necessary for the proper performance of its
duties.

               6.2    MSDW TRUST hereby agrees to establish and maintain
facilities and procedures reasonably acceptable to the Fund for safekeeping of
Share certificates, check forms and facsimile signature imprinting devices, if
any; and for the preparation or use, and for keeping account of, such
certificates, forms and devices.

               6.3    MSDW TRUST shall prepare and keep records relating to the
services to be performed hereunder, in the form and manner as it may deem
advisable and as required by applicable laws and regulations.  To the extent
required by Section 31 of the 1940 Act, and the Rules and Regulations
thereunder, MSDW TRUST agrees that all such records


                                         -11-
<PAGE>

prepared or maintained by MSDW TRUST relating to the services to be performed by
MSDW TRUST hereunder are the property of the Fund and will be preserved,
maintained and made available in accordance with such Section 31 of the 1940
Act, and the rules and regulations thereunder, and will be surrendered promptly
to the Fund on and in accordance with its request.

               6.4    MSDW TRUST and the Fund agree that all books, records,
information and data pertaining to the business of the other party which are
exchanged or received pursuant to the negotiation or the carrying out of this
Agreement shall remain confidential and shall not be voluntarily disclosed to
any other person except as may be required by law or with the prior consent of
MSDW TRUST and the Fund.

               6.5  In case of any request or demands for the inspection of the
Shareholder records of the Fund, MSDW TRUST will endeavor to notify the Fund and
to secure instructions from an authorized officer of the Fund as to such
inspection.  MSDW TRUST reserves the right, however, to exhibit the Shareholder
records to any person whenever it is advised by its counsel that it may be held
liable for the failure to exhibit the Shareholder records to such person.

Article 7      DURATION AND TERMINATION OF AGREEMENT

               7.1    This Agreement shall remain in full force and effect until
August 1, 2000 and from year-to-year thereafter unless terminated by either
party as provided in Section 7.2 hereof.


                                         -12-
<PAGE>


               7.2    This Agreement may be terminated by the Fund on 60 days
written notice and by MSDW TRUST on 90 days written notice to the other party
without payment of any penalty.

               7.3    Should the Fund exercise its right to terminate, all
out-of-pocket expenses associated with the movement of records and other
materials will be borne by the Fund.  Additionally, MSDW TRUST reserves the
right to charge for any other reasonable fees and expenses associated with such
termination.

Article 8      ASSIGNMENT

               8.1    Except as provided in Section 8.3 below, neither this
Agreement nor any rights or obligations hereunder may be assigned by either
party without the written consent of the other party.

               8.2    This Agreement shall inure to the benefit of and be
binding upon the parties and their respective permitted successors and assigns.

               8.3    MSDW TRUST may, in its sole discretion and without
further consent by the Fund, subcontract, in whole or in part, for the
performance of its obligations and duties hereunder with any person or entity
including but not limited to companies which are affiliated with MSDW TRUST;
PROVIDED, HOWEVER, that such person or entity has and maintains the
qualifications, if any, required to perform such obligations and duties and that
MSDW TRUST shall be as fully responsible to the Fund for the acts and omissions
of any agent or


                                         -13-
<PAGE>

subcontractor as it is for its own acts or omissions under this Agreement.

Article 9      AFFILIATIONS

               9.1    MSDW TRUST may now or hereafter, without the consent of
or notice to the Fund, function as transfer agent, registrar and/or shareholder
servicing agent for any other investment company registered with the SEC under
the 1940 Act and for any other issuer, including without limitation any
investment company whose adviser, administrator, sponsor or principal
underwriter is or may become affiliated with Morgan Stanley Dean Witter & Co. or
any of its direct or indirect subsidiaries or affiliates.

               9.2    It is understood and agreed that the Directors or
Trustees (as the case may be), officers, employees, agents and shareholders of
the Fund, and the directors, officers, employees, agents and shareholders of the
Fund's investment adviser and/or distributor, are or may be interested in MSDW
TRUST as directors, officers, employees, agents and shareholders or otherwise,
and that the directors, officers, employees, agents and shareholders of MSDW
TRUST may be interested in the Fund as Directors or Trustees (as the case may
be), officers, employees, agents and shareholders or otherwise, or in the
investment adviser and/or distributor as directors, officers, employees, agents,
shareholders or otherwise.

Article 10     AMENDMENT

               10.1  This Agreement may be amended or modified by a written
agreement executed by both parties and authorized or approved by a resolution of
the Board of Directors or the Board of Trustees (as the case may be) of the
Fund.


                                         -14-
<PAGE>

Article 11     APPLICABLE LAW

               11.1  This Agreement shall be construed and the provisions
thereof interpreted under and in accordance with the laws of the State of New
York.

Article 12     MISCELLANEOUS

               12.1  In the event that one or more additional investment
companies managed or administered by Morgan Stanley Dean Witter Advisors Inc.
("Additional Funds") desires to retain MSDW TRUST to act as transfer agent,
dividend disbursing agent and/or shareholder servicing agent, and MSDW TRUST
desires to render such services, such services shall be provided pursuant to a
letter agreement, substantially in the form of Exhibit A hereto, between MSDW
TRUST and each Additional Fund.

               12.2  In the event of an alleged loss or destruction of any Share
certificate, no new certificate shall be issued in lieu thereof, unless there
shall first be furnished to MSDW TRUST an affidavit of loss or non-receipt by
the holder of Shares with respect to which a certificate has been lost or
destroyed, supported by an appropriate bond satisfactory to MSDW TRUST and the
Fund issued by a surety company satisfactory to MSDW TRUST, except that MSDW
TRUST may accept an affidavit of loss and indemnity agreement executed by the
registered holder (or legal representative) without surety in such form as MSDW
TRUST deems appropriate indemnifying MSDW TRUST and the Fund for the issuance of
a replacement certificate, in cases where the alleged loss is in the amount of
$1,000 or less.

               12.3  Any notice or other instrument authorized or required by
this Agreement to


                                         -15-
<PAGE>

be given in writing to the Fund or to MSDW TRUST shall be sufficiently given if
addressed to that party and received by it at its office set forth below or at
such other place as it may from time to time designate in writing.

To the Fund:

[Name of Fund]
Two World Trade Center
New York, New York  10048

Attention:  General Counsel


To MSDW TRUST:

Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center, Plaza Two
Jersey City, New Jersey  07311

Attention:  President

Article 13     MERGER OF AGREEMENT

               13.1  This Agreement constitutes the entire agreement between the
parties hereto and supersedes any prior agreement with respect to the subject
matter hereof whether oral or written.

Article 14     PERSONAL LIABILITY

               14.1  In the case of a Fund organized as a Massachusetts business
trust, a copy of the Declaration of Trust of the Fund is on file with the
Secretary of The Commonwealth of Massachusetts, and notice is hereby given that
this instrument is executed on behalf of the Board of Trustees of the Fund as
Trustees and not individually and that the obligations of this


                                         -16-
<PAGE>

instrument are not binding upon any of the Trustees or shareholders individually
but are binding only upon the assets and property of the Fund; provided,
however, that the Declaration of Trust of the Fund provides that the assets of a
particular Series of the Fund shall under no circumstances be charged with
liabilities attributable to any other Series of the Fund and that all persons
extending credit to, or contracting with or having any claim against, a
particular Series of the Fund shall look only to the assets of that particular
Series for payment of such credit, contract or claim.
          
IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed
in their names and on their behalf by and through their duly authorized
officers, as of the day and year first above written.

 1.  High Income Advantage Trust 
 2.  High Income Advantage Trust II 
 3.  High Income Advantage Trust III 
 4.  Morgan Stanley Dean Witter Prime Income Trust 
 5.  InterCapital Income Securities Inc. 
 6.  Dean Witter Government Income Trust 
 7.  InterCapital Insured Municipal Bond Trust 
 8.  InterCapital Insured Municipal Trust 
 9.  InterCapital Insured Municipal Income Trust 
10.  InterCapital Insured Municipal Securities 
11.  InterCapital California Insured Municipal Income Trust 
12.  InterCapital Insured California Municipal Securities 
13.  InterCapital Quality Municipal Investment Trust 
14.  InterCapital Quality Municipal Income Trust 
15.  InterCapital Quality Municipal Securities 
16.  InterCapital California Quality Municipal Securities 
17.  InterCapital New York Quality Municipal Securities 
18.  Municipal Income Trust 
19.  Municipal Income Trust II 
20.  Municipal Income Trust III 
21.  Municipal Income Opportunities Trust 
22.  Municipal Income Opportunities Trust II
23.  Municipal Income Opportunities Trust III
24.  Municipal Premium Income Trust
25.  TCW/DW Term Trust 2000   



                                         -17-
<PAGE>

26.  TCW/DW Term Trust 2002
27.  TCW/DW Term Trust 2003



                          By:                       
                               -------------------------
                               Barry Fink
                               Vice President, Secretary and
                               General Counsel
ATTEST:


- - ------------------------
Assistant Secretary


                          MORGAN STANLEY DEAN WITTER TRUST FSB

                          By:                       
                               -------------------------
                               John Van Heuvelen     
                               President
ATTEST:

- - ------------------------
Executive Vice President


                                         -18-
<PAGE>

                                     EXHIBIT A

Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center, Plaza Two
Jersey City, NJ 07311

Gentlemen:

          The undersigned, (NAME OF INVESTMENT COMPANY), a (Maryland
corporation/Massachusetts business trust) (the "Fund"), desires to employ and
appoint Morgan Stanley Dean Witter Trust FSB ("MSDW TRUST") to act as transfer
agent for each series and class of shares of the Fund, dividend disbursing agent
shareholder servicing agent, registrar and agent in connection with the Fund's
Dividend Reinvestment Plan.

          The Fund hereby agrees that, in consideration for the payment by the
Fund to MSDW TRUST of fees as set out in the fee schedule attached hereto as
Schedule A, MSDW TRUST shall provide such services to the Fund pursuant to the
terms and conditions set forth in the Transfer Agency and Service Agreement
annexed hereto, as if the Fund was a signatory thereto.

          Please indicate MSDW TRUST's acceptance of employment and appointment
by the Fund in the capacities set forth above by so indicating in the space
provided below.

                              
Very truly yours,

                              (Name of Fund)

                              By:
                                 ------------------------

ACCEPTED AND AGREED TO:

MORGAN STANLEY DEAN WITTER TRUST FSB

By:
   ------------------------

Its:
    -----------------------

Date:
     ----------------------


                                         -19-
<PAGE>

                                     SCHEDULE A


Fund:     Morgan Stanley Dean Witter Prime Income Trust

Fees:     (1)  Annual maintenance fee of $10.00 per shareholder account, payable
          monthly.

          (2)  A fee equal to 1/12 of the fee set forth in (1) above, for
          providing Forms 1099 for accounts closed during the year, payable
          following the end of the calendar year.

          (3)  Out-of-pocket expenses in accordance with Section 2.2 of the
          Agreement.

          (4)  Fees for additional services not set forth in this Agreement
          shall be as negotiated between the parties.




                                         -20-

<PAGE>

                   MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
                               TWO WORLD TRADE CENTER
                                 NEW YORK, NEW YORK
                                       10048
                                          

                                             November 20, 1998


Morgan Stanley Dean Witter Prime Income Trust
Two World Trade Center
New York, New York
10048


Dear Sirs:

     With respect to the Registration Statement on form N-2 (File No. 811-5898)
(The "Registration Statement") filed by Morgan Stanley Dean Witter Prime Income
Trust, a Massachusetts business trust (the "Fund"), with the Securities and
Exchange Commission for the purpose of registering under the Securities Act
1933, as amended, 350,000,000 shares of Beneficial Interest of $0.01 par value
of the Fund (the "Shares"), I, as your counsel, have examined such Fund records,
certificates and other documents and reviewed such questions of law as I have
considered necessary or appropriate for the purpose of this opinion, and on the
basis of such examination and review, I advise you that, in my opinion, proper
trust proceedings have been taken by the Fund so that the Shares have been
validly authorized; and when the Shares have been issued and sold in accordance
with the terms of the Underwriting Agreement referred to in the Registration
Statement, the Shares will be validly issued, fully paid and non-assessable.

     As to matters of Massachusetts law contained in the foregoing opinion, I
have relied upon the opinion of Lane Altman & Owens LLP dated November 20,
1998.

     I hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to me under the caption "Legal
Counsel" in the Prospectus forming a part of the Registration Statement.  In
giving this consent, I do not thereby admit that I am within the category of
persons whose consent is required under Section 7 of the Securities Act of 1933,
as amended, or the rules and regulations of the Securities and Exchange
Commission thereunder.

                                        Very truly yours,
                                    /s/ Barry Fink
                                        ----------
                                        Barry Fink
                                        General Counsel


<PAGE>

                    [Lane Altman & Owens LLP  Letterhead]



                                       November 20, 1998

Barry Fink, Vice President
  and General Counsel
Morgan Stanley Dean Witter Advisors Inc.
Two World Trade Center
New York, NY 10048


     RE: MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST

Dear Barry:

     We understand that the trustees (the "Trustees") of Morgan Stanley Dean 
Witter Prime Income Trust, a Massachusetts business trust (the "Trust"), 
intend, on or about November 20, 1998, to cause to be filed on behalf of the 
Trust a Form N-2 Registration Statement (as amended, the "Registration 
Statement") for the purpose of registering for sale 350,000,000 shares of 
Beneficial Interest, $.01 par value, of the Trust (the "Shares"). We further 
understand that the Shares will be issued and sold pursuant to the 
underwriting agreement which is referred to in, and attached as an Exhibit 
to, the Registration Statement (the "Underwriting Agreement").

     You have requested that we act as special counsel to the Trust regarding
certain matters of Massachusetts law respecting the organization of the 
Trust, and in such capacity we are furnishing you with this opinion.

     The Trust is organized under a written amended and restated declaration 
of trust finally executed and filed in Boston, Massachusetts on August 17, 
1989 (as amended, the "Trust Agreement"). The Trustees (as defined in the Trust 
Agreement) have the powers set forth in the Trust Agreement, subject to the 
terms, provisions and conditions therein provided.

     In connection with the opinions set forth herein, you and the Trust have 
provided to us originals, copies or facsimile transmissions of, and we have 
reviewed and relied upon, among other things: a copy of the Trust Agreement; 
form of the Underwriting Agreement; and the Registration Statement (including 
the exhibits thereto). We have assumed that the amended and restated by-laws 
dated October 23, 1997 filed as an exhibit to the Registration Statement have 
been duly adopted by the Trustees. We have also reviewed and relied upon a 
certificate of the 

<PAGE>

Lane Altman & Owens LLP
  Counsellors at Law

Barry Fink, Vice President and 
General Counsel
November 20, 1998
Page 2


Secretary of State of the Commonwealth of Massachusetts dated November 20, 
1998 attesting to the valid existence of the Trust.

     In rendering this opinion we have assumed, without independent 
verification, (i) the due authority of all individuals signing in 
representative capacities and the genuineness of signatures, (ii) the 
authenticity, completeness and continued effectiveness of all documents or 
copies furnished to us, (iii) that any resolutions provided have been duly 
adopted by the Trustees, and (iv) that no amendments, agreements, resolutions 
or actions have been approved, executed or adopted which would limit, 
supersede or modify the items described above. We have also explained such 
questions of law as we have concluded necessary or appropriate for purposes 
of the opinions expressed below. Where documents are referred to in resolutions 
approved by the Trustees, or in the Registration Statement, we assume such 
documents are the same as in the most recent form provided to us, whether as an 
exhibit to the Registration Statement, or otherwise. When any opinion set 
forth below relates to the existence or standing of the Trust, such opinion is 
based entirely upon and is limited by the items referred to above, and we 
understand that the foregoing assumptions, limitations and qualifications are 
acceptable to you.

     Based upon the foregoing, and with respect to Massachusetts law only 
(except that no opinion is herein expressed with respect to compliance with 
the Massachusetts Uniform Securities Act), to the extent that Massachusetts 
law may be applicable, and without reference to the laws of any of the other 
several states or of the United States of America, including State and Federal 
Securities laws, we are of the opinion that:

     1. The Trust is a business trust with transferable shares, organized in 
compliance with the requirements of The Commonwealth of Massachusetts and the 
Trust Agreement is legal and valid.

     2. The Shares to which the Registration Statement relates and which are to 
be registered under the Securities Act of 1933, as amended, will be legally and 
validly issued upon receipt by the Trust of consideration determined by the 
Trustees in compliance with Article VI, Section 6.4 of the Trust Agreement. We 
are further of the opinion that such Shares, when issued and sold in 
accordance with the terms of the Underwriting Agreement, will be fully paid and 
non-assessable by the Trust.




<PAGE>

Lane Altman & Owens LLP
  Counsellors at Law

Barry Fink, Vice President and 
General Counsel
November 20, 1998
Page 3


     We understand that you will rely on this opinion solely in connection 
with your opinion to be filed with the Securities and Exchange Commission as 
an Exhibit to the Registration Statement. We hereby consent to such use of 
this opinion and we also consent to the filing of said opinion with the 
Securities and Exchange Commission. In so consenting, we do not thereby admit 
to be within the category of persons whose consent is required under Section 7
of the Securities Act of 1933, as amended, or the rules and regulations of 
the Securities and Exchange Commission thereunder.


                                       Very truly yours,

                                       /s/ LANE ALTMAN & OWENS LLP
                                       ---------------------------
                                       LANE ALTMAN & OWENS LLP





<PAGE>


CONSENT OF INDEPENDENT ACCOUNTANTS


We hereby consent to the use in the Prospectus constituting part of 
this registration statement on Form N-2 of our report dated 
November 2, 1998, relating to the financial statements and financial 
highlights of Morgan Stanley Dean Witter Prime Income Trust, 
formerly Prime Income Trust, which appears in such Prospectus. We 
also consent to the references to us under the headings "Financial 
Highlights" and "Experts" in such Prospectus.


/s/ PricewaterhouseCoopers LLP


PricewaterhouseCoopers LLP
1177 Avenue of the Americas
New York, New York 10036
November 13, 1998


<PAGE>

                      SCHEDULE OF COMPUTATION OF YIELD QUOTATION
                                  PRIME INCOME TRUST
                           30 day as of September 30, 1998




                                           6
          YIELD = 2{ [ ((a-b)/c d) + 1] -1}



          WHERE:     a = Dividends and interest earned during the period

                     b = Expenses accrued for the period

                     c = The average daily number of shares outstanding
                         during the period that were entitled to receive
                         dividends

                     d = The maximum offering price per share on the last
                         day of the period


                                                                            6
      YIELD = 2{ [((13,008,840.37 - 1,986,392.48)/199,342,389.739 X 9.91)+1] -1}


            = 6.79%

<PAGE>

             SCHEDULE FOR COMPUTATIONS OF PERFORMANCE QUOTATIONS
                MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST




(A) AVERAGE ANNUAL TOTAL RETURNS (I.E. STANDARDIZED COMPUTATIONS)

                             _                              _
                            |        ______________________  |
FORMULA:                    |       |                        |
                            |  /\ n |          ERV           |
                    T  =    |    \  |     -------------      |  -1
                            |     \ |           P            |
                            |      \|                        |
                            |_                              _|

                   T = AVERAGE ANNUAL COMPOUND RETURN
                   n = NUMBER OF YEARS
                 ERV = ENDING REDEEMABLE VALUE
                   P = INITIAL INVESTMENT

<TABLE>
<CAPTION>
                                                             (A)
$1,000           ERV AS OF     AGGREGATE       NUMBER OF     AVERAGE ANNUAL
INVESTED - P     30-Sep-98     TOTAL RETURN    YEARS - n     COMPOUND RETURN - T
- - ------------     -----------   --------------  -----------   ----------------
<S>              <C>           <C>             <C>           <C>
 30-Sep-97       $1,041.50        4.15%             1.00           4.15%

 30-Sep-93       $1,443.10       44.31%             5.00           7.61%

 30-Nov-89       $1,880.60       88.06%             8.83           7.41%
</TABLE>

(B) AVERAGE ANNUAL TOTAL RETURNS WITHOUT DEDUCTION FOR APPLICABLE
    SALES CHARGE  (NON STANDARD COMPUTATIONS)

(C) TOTAL RETURN WITHOUT DEDUCTION FOR APPLICABLE SALES CHARGE
    (NON STANDARD COMPUTATIONS)




                             _                              _
                            |        ______________________  |
FORMULA:                    |       |                        |
                            |  /\ n |          EV            |
                    t  =    |    \  |     -------------      |  -1
                            |     \ |           P            |
                            |      \|                        |
                            |_                              _|

                                EV
                   TR  =    ----------   - 1
                                 P


             t = AVERAGE ANNUAL COMPOUND RETURN
                 (NO DEDUCTION FOR APPLICABLE SALES CHARGE)
             n = NUMBER OF YEARS
            EV = ENDING VALUE (NO DEDUCTION FOR APPLICABLE SALES CHARGE)
             P = INITIAL INVESTMENT
            TR = TOTAL RETURN (NO DEDUCTION FOR APPLICABLE SALES CHARGE)

<TABLE>
<CAPTION>
                               (C)                           (B)
$1,000           EV AS OF      TOTAL           NUMBER OF     AVERAGE ANNUAL
INVESTED - P     30-Sep-98     RETURN - TR     YEARS - n     COMPOUND RETURN - t
- - -------------    -----------   -----------     ----------    -------------------
<S>              <C>           <C>             <C>           <C>
 30-Sep-97       $1,071.40        7.14%             1.00           7.14%

 30-Sep-93       $1,443.10       44.31%             5.00           7.61%

 30-Nov-89       $1,880.60       88.06%             8.83           7.41%
</TABLE>

(D)        GROWTH OF $10,000
(E)        GROWTH OF $50,000
(F)        GROWTH OF $100,000

FORMULA:   G= (TR+1)*P
           G= GROWTH OF INITIAL INVESTMENT
           P= INITIAL INVESTMENT
           TR= TOTAL RETURN SINCE INCEPTION

<TABLE>
<CAPTION>
                               (D)                        (E)                         (F)
$10,000          TOTAL         GROWTH OF                  GROWTH OF                   GROWTH OF
INVESTED - P     RETURN - TR   $10,000 INVESTMENT - G     $50,000 INVESTMENT - G      $100,000 INVESTMENT - G
- - -----------      -----------   ----------------------     ----------------------      ----------------------------
<S>              <C>           <C>                        <C>                         <C>
 30-Nov-89           88.06         $18,806                     $94,030                       $188,060
</TABLE>


<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-START>                             OCT-01-1997
<PERIOD-END>                               SEP-30-1998
<INVESTMENTS-AT-COST>                    1,981,943,805
<INVESTMENTS-AT-VALUE>                   1,980,927,647
<RECEIVABLES>                               22,007,067
<ASSETS-OTHER>                               1,658,262
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,004,592,976
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                            0
<TOTAL-LIABILITIES>                          7,883,548
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 2,008,631,657
<SHARES-COMMON-STOCK>                      201,526,077
<SHARES-COMMON-PRIOR>                      135,154,983
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                       (552,409)
<ACCUMULATED-NET-GAINS>                   (10,353,662)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   (1,016,158)
<NET-ASSETS>                             1,996,709,428
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                          136,371,569
<OTHER-INCOME>                               5,213,703
<EXPENSES-NET>                              21,631,804
<NET-INVESTMENT-INCOME>                    119,953,468
<REALIZED-GAINS-CURRENT>                  (10,227,863)
<APPREC-INCREASE-CURRENT>                    2,829,220
<NET-CHANGE-FROM-OPS>                      112,554,825
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                (120,722,134)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     73,974,045
<NUMBER-OF-SHARES-REDEEMED>               (13,071,383)
<SHARES-REINVESTED>                          5,468,432
<NET-CHANGE-IN-ASSETS>                     652,106,206
<ACCUMULATED-NII-PRIOR>                        526,876
<ACCUMULATED-GAINS-PRIOR>                    (436,418)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       14,434,352
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             21,631,804
<AVERAGE-NET-ASSETS>                     1,673,411,105
<PER-SHARE-NAV-BEGIN>                             9.95
<PER-SHARE-NII>                                   0.71
<PER-SHARE-GAIN-APPREC>                         (0.03)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                       (0.72)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.91
<EXPENSE-RATIO>                                   1.29
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<PAGE>

                                  POWER OF ATTORNEY





     KNOW ALL MEN BY THESE PRESENTS, that Michael Bozic, whose signature appears
below, constitutes and appoints David M. Butowsky, Ronald M. Feiman and Stuart
M. Strauss, or any of them, his true and lawful attorneys-in-fact and agents,
with full power of substitution among himself and each of the persons appointed
herein, for him and in his name, place and stead, in any and all capacities, to
sign any amendments to any registration statement of MORGAN STANLEY DEAN WITTER
PRIME INCOME TRUST, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents, or either
of them, may lawfully do or cause to be done by virtue hereof.


Dated:    October 28, 1998
          --------------------





                                             /s/ Michael Bozic
                                             -----------------------------------
                                             Michael Bozic


<PAGE>

                                  POWER OF ATTORNEY





     KNOW ALL MEN BY THESE PRESENTS, that Charles A. Fiumefreddo, whose
signature appears below, constitutes and appoints Marilyn K. Cranney and Barry
Fink, his true and lawful attorneys-in-fact and agents, with full power of
substitution among himself and each of the persons appointed herein, for him and
in his name, place and stead, in any and all capacities, to sign any amendments
to any registration statement of MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST,
and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission, as fully to
all intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or either of them, may
lawfully do or cause to be done by virtue hereof.


Dated:    October 28, 1998
          --------------------






                                             /s/ Charles A. Fiumefreddo
                                             -----------------------------------
                                             Charles A. Fiumefreddo


<PAGE>

                                  POWER OF ATTORNEY





     KNOW ALL MEN BY THESE PRESENTS, that Edwin J. Garn, whose signature appears
below, constitutes and appoints David M. Butowsky, Ronald M. Feiman and Stuart
M. Strauss, or any of them, his true and lawful attorneys-in-fact and agents,
with full power of substitution among himself and each of the persons appointed
herein, for him and in his name, place and stead, in any and all capacities, to
sign any amendments to any registration statement of MORGAN STANLEY DEAN WITTER
PRIME INCOME TRUST, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents, or either
of them, may lawfully do or cause to be done by virtue hereof.


Dated:    October 28, 1998
          --------------------





                                             /s/ Edwin J. Garn
                                             -----------------------------------
                                             Edwin J. Garn


<PAGE>

                                  POWER OF ATTORNEY





     KNOW ALL MEN BY THESE PRESENTS, that Wayne E. Hedien, whose signature
appears below, constitutes and appoints David M. Butowsky, Ronald M. Feiman and
Stuart M. Strauss, or any of them, his true and lawful attorneys-in-fact and
agents, with full power of substitution among himself and each of the persons
appointed herein, for him and in his name, place and stead, in any and all
capacities, to sign any amendments to any registration statement of MORGAN
STANLEY DEAN WITTER PRIME INCOME TRUST, and to file the same, with all exhibits
thereto, and other documents in connection therewith, with the Securities and
Exchange Commission, as fully to all intents and purposes as he might or could
do in person, hereby ratifying and confirming all that said attorneys-in-fact
and agents, or either of them, may lawfully do or cause to be done by virtue
hereof.


Dated:    October 28, 1998
          --------------------





                                             /s/ Wayne E. Hedien
                                             -----------------------------------
                                             Wayne E. Hedien


<PAGE>

                                  POWER OF ATTORNEY





     KNOW ALL MEN BY THESE PRESENTS, that John R. Haire, whose signature appears
below, constitutes and appoints David M. Butowsky, Ronald M. Feiman and Stuart
M. Strauss or any of them, his true and lawful attorneys-in-fact and agents,
with full power of substitution among himself and each of the persons appointed
herein, for him and in his name, place and stead, in any and all capacities, to
sign any amendments to any registration statement of MORGAN STANLEY DEAN WITTER
PRIME INCOME TRUST, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents, or either
of them, may lawfully do or cause to be done by virtue hereof.


Dated:    October 28, 1998
          --------------------





                                             /s/ John R. Haire
                                             -----------------------------------
                                             John R. Haire


<PAGE>

                                  POWER OF ATTORNEY





     KNOW ALL MEN BY THESE PRESENTS, that Manuel H. Johnson, whose signature
appears below, constitutes and appoints David M. Butowsky, Ronald M. Feiman and
Stuart M. Strauss, or any of them, his true and lawful attorneys-in-fact and
agents, with full power of substitution among himself and each of the persons
appointed herein, for him and in his name, place and stead, in any and all
capacities, to sign any amendments to any registration statement of MORGAN
STANLEY DEAN WITTER PRIME INCOME TRUST, and to file the same, with all exhibits
thereto, and other documents in connection therewith, with the Securities and
Exchange Commission, as fully to all intents and purposes as he might or could
do in person, hereby ratifying and confirming all that said attorneys-in-fact
and agents, or either of them, may lawfully do or cause to be done by virtue
hereof.


Dated:    October 28, 1998
          --------------------





                                             /s/ Manuel H. Johnson
                                             -----------------------------------
                                             Manuel H. Johnson


<PAGE>

                                  POWER OF ATTORNEY





     KNOW ALL MEN BY THESE PRESENTS, that Michael E. Nugent, whose signature
appears below, constitutes and appoints David M. Butowsky, Ronald M. Feiman and
Stuart M. Strauss, or any of them, his true and lawful attorneys-in-fact and
agents, with full power of substitution among himself and each of the persons
appointed herein, for him and in his name, place and stead, in any and all
capacities, to sign any amendments to any registration statement of MORGAN
STANLEY DEAN WITTER PRIME INCOME TRUST, and to file the same, with all exhibits
thereto, and other documents in connection therewith, with the Securities and
Exchange Commission, as fully to all intents and purposes as he might or could
do in person, hereby ratifying and confirming all that said attorneys-in-fact
and agents, or either of them, may lawfully do or cause to be done by virtue
hereof.


Dated:    October 28, 1998
          --------------------





                                             /s/ Michael E. Nugent
                                             -----------------------------------
                                             Michael E. Nugent


<PAGE>

                                  POWER OF ATTORNEY





     KNOW ALL MEN BY THESE PRESENTS, that Philip J. Purcell, whose signature
appears below, constitutes and appoints Marilyn K. Cranney and Barry Fink, or
either of them, his true and lawful attorneys-in-fact and agents, with full
power of substitution among himself and each of the persons appointed herein,
for him and in his name, place and stead, in any and all capacities, to sign any
amendments to any registration statement of MORGAN STANLEY DEAN WITTER PRIME
INCOME TRUST, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents, or either
of them, may lawfully do or cause to be done by virtue hereof.


Dated:    October 28, 1998
          --------------------





                                             /s/ Philip J. Purcell
                                             -----------------------------------
                                             Philip J. Purcell


<PAGE>

                                  POWER OF ATTORNEY





     KNOW ALL MEN BY THESE PRESENTS, that John L. Schroeder, whose signature
appears below, constitutes and appoints David M. Butowsky, Ronald M. Feiman and
Stuart M. Strauss, or any of them, his true and lawful attorneys-in-fact and
agents, with full power of substitution among himself and each of the persons
appointed herein, for him and in his name, place and stead, in any and all
capacities, to sign any amendments to any registration statement of MORGAN
STANLEY DEAN WITTER PRIME INCOME TRUST, and to file the same, with all exhibits
thereto, and other documents in connection therewith, with the Securities and
Exchange Commission, as fully to all intents and purposes as he might or could
do in person, hereby ratifying and confirming all that said attorneys-in-fact
and agents, or either of them, may lawfully do or cause to be done by virtue
hereof.


Dated:    October 28, 1998
          --------------------





                                             /s/ John L Schroeder
                                             -----------------------------------
                                             John L. Schroeder



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