MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
SC TO-I, 2000-02-15
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<PAGE>
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 15, 2000
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------

                                  SCHEDULE TO
                         ISSUER TENDER OFFER STATEMENT
                      (PURSUANT TO SECTION 13(e)(1) OF THE
                        SECURITIES EXCHANGE ACT OF 1934)
                               (AMENDMENT NO.   )

                 MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
                                (Name of Issuer)

                 MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
                      (Name of Person(s) Filing Statement)

         COMMON SHARES OF BENEFICIAL INTEREST, PAR VALUE $.01 PER SHARE
                         (Title of Class of Securities)

                                   616971-107
                     (CUSIP Number of Class of Securities)
                                Barry Fink, Esq.
                 Morgan Stanley Dean Witter Prime Income Trust
                             Two World Trade Center
                              New York, N.Y. 10048
                                 (212) 392-1600

      (Name, Address and Telephone Number of Person Authorized to Receive
      Notices and Communications on Behalf of Person(s) Filing Statement)
                            ------------------------

                           CALCULATION OF FILING FEE
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
TRANSACTION VALUATION $118,200,000 (a)         AMOUNT OF FILING FEE: $23,640 (b)
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

(a) Calculated as the aggregate maximum purchase price to be paid for 12,000,000
    shares in the offer.

(b) Calculated as 1/50 of 1% of the Transaction Valuation.

 / / Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
    and identify the filing with which the offsetting fee was previously paid.
    Identify the previous filing by registration statement number, or the Form
    or Schedule and the date of its filing.
    Amount Previously Paid: ____________________________________________________
    Form or Registration No.: __________________________________________________
    Filing Party: ______________________________________________________________
    Date Filed: ________________________________________________________________

 / / Check the box if the filing relates solely to preliminary communications
    made before the commencement of a tender offer.

    Check the appropriate boxes below to designate any transactions to which the
    statement relates:

     / / third-party tender offer subject to Rule 14d-1.

     /X/ issuer tender offer subject to Rule 13e-4.

     / / going-private transaction subject to Rule 13e-3.

     / / amendment to Schedule 13D under Rule 13d-2.

    Check the following box if the filing is a final amendment reporting the
    results of the tender offer: / /

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
ITEM 1.  SUMMARY TERM SHEET.

    Reference is hereby made to the Summary Term Sheet of the Offer to Purchase
which is attached as exhibit (a)(1)(i) and is incorporated herein by reference.

ITEM 2.  SUBJECT COMPANY INFORMATION.

    (a)  The name of the issuer is Morgan Stanley Dean Witter Prime Income
Trust, a non-diversified, closed-end management investment company organized as
a Massachusetts business trust (the "Trust") under the name "Allstate Prime
Income Trust." The name was changed to "Prime Income Trust," effective March 1,
1993 and then to "Morgan Stanley Dean Witter Prime Income Trust," effective
June 22, 1998. The principal executive offices of the Trust are located at Two
World Trade Center, New York, N.Y. 10048. The telephone number is (212)
392-1600.

    (b)  The title of the securities being sought is common shares of beneficial
interest, par value $.01 per share (the "Common Shares"). As of February 4, 2000
there were approximately 268,237,235 Common Shares issued and outstanding.

    (c)  The Common Shares are not currently traded on an established trading
market.

ITEM 3.  IDENTITY AND BACKGROUND OF FILING PERSON.

    (a)  The name of the filing person is Morgan Stanley Dean Witter Prime
Income Trust, a non-diversified, closed-end management investment company
organized as a Massachusetts business trust (the "Trust") under the name
"Allstate Prime Income Trust." The name was changed to "Prime Income Trust,"
effective March 1, 1993 and then to "Morgan Stanley Dean Witter Prime Income
Trust," effective June 22, 1998. The principal executive offices of the Trust
are located at Two World Trade Center, New York, N.Y. 10048. The telephone
number is (212) 392-1600. The filing person is the Subject Company.

ITEM 4.  TERMS OF THE TRANSACTION.

    The Trust is seeking tenders for up to 12,000,000 Common Shares, at the net
asset value per Common Share, calculated on the day the tender offer expires,
upon the terms and subject to the conditions set forth in the Offer to Purchase,
dated February 16, 2000 (the "Offer to Purchase"), and the related Letter of
Transmittal (which together constitute the "Offer"). An "Early Withdrawal
Charge" will be imposed on most Common Shares accepted for payment that were
held for four years or Less. A copy of each of the Offer to Purchase and the
Letter of Transmittal is attached hereto as Exhibit (a)(1)(ii) and
Exhibit (a)(2), respectively, each of which is incorporated herein by reference.
For information on the consideration offered to shareholders, the expiration
date, extending the Offer and Trust intentions in the event of oversubscription,
see Section 1 "Price, Number of Common Shares" of the Offer to Purchase. For
information on tendering shares and withdrawing tenders, see Section 2
"Procedures for Tendering Common Shares" and Section 4 "Withdrawal Rights" in
the Offer to Purchase. For information on the accounting and tax treatment of
the Offer, see Section 2 and Section 15 "Certain Federal Income Tax
Consequences" in the Offer to Purchase. The Trust has been informed that no
trustees, officers or affiliates of the Trust intend to tender Common Shares
pursuant to the Offer.

ITEM 5.  PAST CONTACTS, TRANSACTIONS, NEGOTIATIONS AND AGREEMENTS.

    Reference is hereby made to Section 10 "Interest of Trustees and Executive
Officers; Transactions and Arrangements Concerning the Common Shares" of the
Offer to Purchase. Except as set forth therein, the Trust does not know of any
contract, arrangement, understanding or relationship relating, directly or
indirectly, to the Offer (whether or not legally enforceable) between the Trust,
any of the Trust's executive officers or Trustees, any person controlling the
Trust or any officer or director of any corporation ultimately in control of the
Trust and any person with respect to any securities of the Trust (including, but
not limited to, any contract, arrangement, understanding or relationship
concerning the transfer or the voting of any such securities, joint ventures,
loan or option arrangements, puts or calls, guarantees of loans, guarantees
against loss, or the giving or withholding of proxies, consents or
authorizations).

                                       2
<PAGE>
ITEM 6.  PURPOSES OF THE TRANSACTION AND PLANS OR PROPOSALS.

    Reference is hereby made to Section 7 "Purpose of the Offer," Section 8
"Plans or Proposals of the Trust," Section 11 "Certain Effects of the Offer" and
Section 12 "Source and Amount of Funds" of the Offer to Purchase. In addition,
the Trust regularly purchases and sells assets in its ordinary course of
business. Except as set forth above, the Trust has no plans or proposals which
relate to or would result in (a) the acquisition by any person of additional
securities of the Trust or the disposition of securities of the Trust; (b) an
extraordinary corporate transaction, such as a merger, reorganization or
liquidation, involving the Trust; (c) a sale or transfer of a material amount of
assets of the Trust; (d) any change in the present Board of Trustees or
management of the Trust, including, but not limited to, any plans or proposals
to change the number or the term of Trustees, or to fill any existing vacancy on
the Board of Trustees or to change any material term of the employment contract
of any executive officer of the Trust; (e) any material change in the present
dividend rate or policy, or indebtedness or capitalization of the Trust; (f) any
other material change in the Trust's structure or business, including any plans
or proposals to make any changes in its investment policy for which a vote would
be required by Section 13 of the Investment Company Act of 1940; (g) any changes
in the Trust's declaration of trust, By-Laws or instruments corresponding
thereto or other actions which may impede the acquisition of control of the
Trust by any person; (h) a class of equity securities of the Trust being
delisted from a national securities exchange or ceasing to be authorized to be
quoted on an inter-dealer quotation system of a registered national securities
association; (i) a class of equity security of the Trust becoming eligible for
termination of registration under the Investment Company Act of 1940; or (j) the
suspension of the Trust's obligation to file reports pursuant to Section 15(d)
of the Securities Exchange Act of 1934.

ITEM 7.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

    Reference is hereby made to Section 12 "Source and Amount of Funds" of the
Offer to Purchase.

ITEM 8.  INTEREST IN SECURITIES OF THE SUBJECT COMPANY.

    Reference is hereby made to Section 10 "Interest of Trustees and Executive
Officers; Transactions and Arrangements Concerning the Common Shares" of the
Offer to Purchase. Except as set forth therein, there have not been any
transactions involving the Common Shares of the Trust that were effected during
the past 60 days by the Trust, any executive officer or Trustee of the Trust,
any person controlling the Trust, any executive officer or director of any
corporation ultimately in control of the Trust or by any associate or subsidiary
of any of the foregoing, including any executive officer or director of any such
subsidiary.

ITEM 9.  PERSONS/ASSETS RETAINED, EMPLOYED COMPENSATED OR USED.

    No persons have been employed, retained or are to be compensated by or on
behalf of the Trust to make solicitations or recommendations in connection with
the Offer.

ITEM 10.  FINANCIAL INFORMATION.

    (a)-(b)  Reference is hereby made to the Financial Statements included as
part of the offer to purchase Exhibit.

ITEM 11.  ADDITIONAL INFORMATION.

    (a) (1)  Reference is hereby made to Section 10 "Interests of Trustees and
Executive Officers; Transactions and Arrangements Concerning the Common Shares"
of the Offer to Purchase which is incorporated herein by reference.

    (a)(2)-(5)  Not applicable.

    (b)  Reference is hereby made to The Offer to Purchase.

                                       3
<PAGE>
ITEM 12.  EXHIBITS.

<TABLE>
    <S>          <C>
    (a)(1)(i)    Offer to Purchase (including Financial Statements).
    (a)(1)(ii)   Form of Letters to Shareholders who have requested Offer to
                  Purchase.
    (a)(1)(iii)  Form of Letter of Transmittal (including Guidelines for
                  Certification of Taxpayer Identification Number).
    (a)(2)       Advertisement printed in THE WALL STREET JOURNAL National
                  Edition.
    (a)(3)       Not applicable.
    (a)(4)       Not applicable.
    (a)(5)       Not applicable.
    (b)          Not applicable.
    (d)(1)       Hold Harmless Agreement between the Trust and Dean Witter
                  Reynolds Inc. dated May 2, 1990 previously filed as
                  Exhibit (c)(1) to the Trust's Schedule 13E-4 on May 22,
                  1990 and via EDGAR on December 20, 1993.
    (d)(2)       Form of Depositary Agreement between the Trust and Morgan
                  Stanley Dean Witter Trust FSB dated as of February 4, 2000.
    (d)(3)       Form of Administration Agreement dated April 17, 1995 and
                  amended as of April 30, 1998. Previously filed as Exhibit
                  (c)(2) to the Trust's Schedule 13E-4 via EDGAR on August 4,
                  1998.
    (d)(4)       Investment Advisory Agreement dated May 31, 1997 and amended
                  as of April 30, 1998.
    (d)(5)       Distribution Agreement dated May 31, 1997.
    (g)          Not applicable.
    (h)          Not applicable.
</TABLE>

                                       4
<PAGE>
                                   SIGNATURE

    After due inquiry and to the best of my knowledge and belief, I certify that
the information set forth in this statement is true, complete and correct.

                                          MORGAN STANLEY DEAN WITTER
                                          PRIME INCOME TRUST

                                                      /s/ Barry Fink
                                          --------------------------------------

                                                        Barry Fink
                                               Vice President and Secretary

February 15, 2000

                                       5
<PAGE>
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT                                          DESCRIPTION                                  PAGE
- -------                                          -----------                                --------
<C>                      <S>                                                                <C>
       (a)(1)(i)         Offer to Purchase (including Financial Statements)..........
      (a)(1)(ii)         Form of Letters to Shareholders who have requested Offer to
                          Purchase...................................................
     (a)(1)(iii)         Form of Letter of Transmittal (including Guidelines for
                          Certification of Taxpayer Identification Number)...........
          (a)(2)         Advertisement printed in THE WALL STREET JOURNAL National
                          Edition....................................................
          (a)(3)         Not applicable..............................................
          (a)(4)         Not applicable..............................................
          (a)(5)         Not applicable..............................................
             (b)         Not applicable..............................................
          (d)(1)         Hold Harmless Agreement between the Trust and Dean Witter
                          Reynolds Inc. dated May 2, 1990 previously filed as
                          Exhibit (c)(1) to the Trust's Schedule 13E-4 on May 22,
                          1990 and via EDGAR on December 20, 1993....................
          (d)(2)         Form of Depositary Agreement between the Trust and Morgan
                          Stanley Dean Witter Trust FSB dated as of February 4,
                          2000.......................................................
          (d)(3)         Form of Administration Agreement dated April 17, 1995 and
                          amended as of April 30, 1998. Previously filed as Exhibit
                          (c)(2) to the Trust's Schedule 13E-4 via EDGAR on August 4,
                          1998.......................................................
          (d)(4)         Investment Advisory Agreement dated May 31, 1997 and amended
                          as of April 30, 1998.......................................
          (d)(5)         Distribution Agreement dated May 31, 1997...................
             (g)         Not applicable..............................................
             (h)         Not applicable..............................................
</TABLE>

                                       6

<PAGE>
                                                               EXHIBIT (a)(1)(i)

                               OFFER TO PURCHASE
<PAGE>
                 MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST

                     OFFER TO PURCHASE FOR CASH 12,000,000
                           OUTSTANDING COMMON SHARES
                               SUMMARY TERM SHEET

    THIS SUMMARY HIGHLIGHTS CERTAIN INFORMATION IN THIS OFFER TO PURCHASE. TO
UNDERSTAND THE OFFER FULLY AND FOR A MORE COMPLETE DESCRIPTION OF THE TERMS OF
THE OFFER, YOU SHOULD READ CAREFULLY THIS ENTIRE OFFER TO PURCHASE AND THE
RELATED LETTER OF TRANSMITTAL. WE HAVE INCLUDED PAGE REFERENCES PARENTHETICALLY
TO DIRECT YOU TO A MORE COMPLETE DESCRIPTION OF THE TOPICS IN THIS SUMMARY.

WHAT SECURITIES IS MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST OFFERING TO
PURCHASE? (PAGE 6)

    The Trust is offering to purchase up to 12,000,000 of its common shares. If
more than 12,000,000 shares are surrendered in response to this offer, i.e.,
"tendered," the Trust expects to either extend the offer period and increase the
number of shares it is offering to purchase OR purchase the shares tendered on a
pro rata basis. The offer is not conditioned upon the tender of any minimum
number of shares.

HOW MUCH AND IN WHAT FORM WILL THE TRUST PAY ME FOR MY SHARES? (PAGE 6)

    The Trust will pay cash for your shares tendered in proper form. The
purchase price will equal the net asset value (NAV) per share, determined as of
4:00 p.m., New York City time, on the date the offer expires (currently, March
17, 2000). As of February 4, 2000, the Trust's NAV was $9.85 per common share.
Of course, the NAV can change every business day.

WILL I HAVE TO PAY ANY FEES OR COMMISSIONS? (PAGES 6 AND 8)

    You will be charged an early withdrawal fee on tendered shares purchased by
the Trust, if you held those shares for four years or less. The maximum fee is
3% of the value of the tendered shares, scaled down for each year you held your
shares, reaching zero after four years. The charge is not imposed on shares
acquired through reinvestment of dividends nor on the value of your shares
attributable to appreciation.

DOES THE TRUST HAVE THE FINANCIAL RESOURCES TO PAY ME FOR MY SHARES? (PAGE 12)

    Assuming the Trust purchases 12,000,000 common shares at the February 4 NAV
of $9.85 per share, the Trust's total cost, not including fees and expenses
incurred in connection with the offer, will be approximately $118.2 million. The
Trust believes that it will not need to borrow money to finance the purchase of
tendered shares, although the Trust has the authority to do so, if necessary.

WHEN DOES THE OFFER EXPIRE? CAN THE TRUST EXTEND THE OFFER, AND IF SO, HOW WILL
I BE NOTIFIED? (PAGES 6 AND 13)

    - The offer expires Friday, March 17, 2000, at 12:00 midnight, New York City
      time, unless the Trust extends the offer.

    - The Trust may extend the offer period at any time.

    - If the offer period is extended, the Trust will make a public announcement
      of the extension no later than 9:00 a.m. on the next business day
      following the previously scheduled expiration date.

HOW DO I TENDER MY SHARES? (PAGE 6)

    If you decide to tender your shares:

    - You may contact your Morgan Stanley Dean Witter Financial Advisor and
      request that your shares be tendered to Morgan Stanley Dean Witter Trust
      FSB (the Depositary, i.e., acts as agent for the Trust).

    - If you do not have a MSDW Financial Advisor or you hold certificates of
      Trust shares, you must:

        a)  complete and sign in proper form the Letter of Transmittal
           accompanying this Offer to Purchase; and
<PAGE>
        b)  send the Letter of Transmittal, any certificates of shares and any
           other required documents to the Depositary (whose address is on the
           cover page) before the expiration date.

UNTIL WHAT TIME CAN I WITHDRAW TENDERED SHARES? (PAGE 9)

    You may withdraw your tendered shares at any time before the expiration
date. In addition, if the Trust has not yet accepted your tendered shares for
payment, you may withdraw your offer before 12:01 a.m. on April 12, 2000.

HOW DO I WITHDRAW TENDERED SHARES? (PAGE 9)

    - contact your MSDW Financial Advisor; or

    - submit proper written notice to the Depositary.

WILL THERE BE ANY TAX CONSEQUENCES TO TENDERING MY SHARES? (PAGE 13)

    If your tendered shares are accepted, it will be a taxable transaction
either in the form of a "sale or exchange" or under certain circumstances, as a
"dividend."

    Please consult your tax advisor as to the tax consequences of tendering your
shares.

WHAT IS THE PURPOSE OF THE OFFER? (PAGE 10)

    The offer seeks to provide liquidity for Trust shareholders. The Trust's
Board of Trustees presently intends to consider making similar offers each
quarter. However, the Trust cannot assure you that you will be provided
sufficient liquidity or that the Trust will make a similar tender offer in the
future.

    Please bear in mind that neither the Trust nor its Board has made any
recommendation as to whether or not you should tender your shares.

WHAT ARE THE MOST SIGNIFICANT CONDITIONS TO THE OFFER? (PAGE 10)

    The Trust may terminate the offer, amend its terms, and/or reject shares
tendered for payment or postpone payment, under any one of the following
circumstances which, in the Trust's view, make it inadvisable to proceed with
the offer, purchase or payment:

    - a secondary market for Trust shares develops

    - the Trust believes it has insufficient liquidity to accommodate the offer

    - the Trust believes the offer could impair compliance with SEC or IRS
      requirements

    - trading generally on the New York Stock Exchange is suspended or limited

    - there is in the Trust's judgment any material legal action threatened,
      pending or taken, challenging the offer or otherwise materially adversely
      affecting the Trust.

    - certain other circumstances where the Trust believes that it or
      shareholders may be adversely affected if shares were purchased pursuant
      to the offer.

IF I DECIDE NOT TO TENDER, HOW WILL THE OFFER AFFECT MY SHARES? (PAGE 12)

    If you do not tender you shares, your shares may be subject to increased
risk resulting from the Trust reducing its assets to pay for tendered shares.
Reduced assets could lead, for example, to increased volatility. The risks are
reduced, however, to the extent the Trust sells new shares.

WHO DO I CONTACT IF I HAVE QUESTIONS ABOUT THE TENDER OFFER?

    For additional information or assistance, you may contact your MSDW
Financial Advisor or the Depositary at the toll free number set forth on the
cover of this Offer to Purchase.

                                       2
<PAGE>
                 MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
                     OFFER TO PURCHASE FOR CASH 12,000,000
                  OF ITS ISSUED AND OUTSTANDING COMMON SHARES
                      AT NET ASSET VALUE PER COMMON SHARE
- --------------------------------------------------------------------------------
               THE OFFER, PRORATION PERIOD AND WITHDRAWAL RIGHTS
                WILL EXPIRE AT 12:00 MIDNIGHT NEW YORK CITY TIME
                ON MARCH 17, 2000, UNLESS THE OFFER IS EXTENDED.
- --------------------------------------------------------------------------------

To the Holders of Common Shares of
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST:

    Morgan Stanley Dean Witter Prime Income Trust, a non-diversified, closed-end
management investment company organized as a Massachusetts business trust (the
"Trust") under the former name "Allstate Prime Income Trust," is offering to
purchase up to 12,000,000 of its common shares of beneficial interest, with par
value of $.01 per share ("Common Shares"), for cash at a price (the "Purchase
Price") equal to their net asset value ("NAV") computed as of 4:00 P.M. New York
City time on March 17, 2000. The offer, proration period and withdrawal rights
will expire at 12:00 midnight New York City time on March 17, 2000 (the "Initial
Expiration Date"), unless extended (the Initial Expiration Date or the latest
date to which the Offer is extended, the "Expiration Date"), upon the terms and
conditions set forth in this Offer to Purchase and the related Letter of
Transmittal (which together constitute the "Offer"). An Early Withdrawal Charge
(as defined in Section 3) will be imposed on most Common Shares accepted for
payment that have been held for four years or less. The Common Shares are not
currently traded on an established trading market. The NAV on February 4, 2000
was $9.85 per Common Share. Through the Expiration Date, you can obtain current
NAV quotations from Morgan Stanley Dean Witter Advisors Inc. ("MSDW Advisors")
by calling (800) 869-NEWS Extension 0 between the hours of 8:30 A.M. and
6:00 P.M. New York City time, Monday through Friday, except holidays. See
Section 9.

    The Offer is not conditioned upon the tender of any minimum number of Common
Shares. If more than 12,000,000 Common Shares are tendered, no Common Shares may
be purchased if (a) the Offer is not extended and the number of Common Shares
for which tenders are sought is not increased to allow the purchase of such
additional Common Shares or (b) the Trust elects not to purchase 12,000,000 of
the tendered Common Shares on a pro rata basis. If more than 12,000,000 Common
Shares are duly tendered prior to the expiration of the Offer, subject to the
condition that there have been no material changes in the factors originally
considered by the Board of Trustees when it determined to make the Offer and in
the other conditions set forth in Section 6, the Trust will either extend the
Offer period, if necessary, and increase the number of Common Shares that the
Trust is offering to purchase to an amount which it believes will be sufficient
to accommodate the excess Common Shares tendered as well as any Common Shares
tendered during the extended Offer period or purchase 12,000,000 (or such larger
number of Common Shares sought) of the Common Shares tendered on a pro rata
basis.

                  THIS OFFER IS BEING MADE TO ALL SHAREHOLDERS
                  OF THE TRUST AND IS NOT CONDITIONED UPON ANY
                MINIMUM NUMBER OF COMMON SHARES BEING TENDERED.

                            THIS OFFER IS SUBJECT TO
                       CERTAIN CONDITIONS. SEE SECTION 6.

                                   IMPORTANT

    If you desire to tender Common Shares, have a brokerage account at Dean
Witter Reynolds Inc. ("DWR") and your Common Shares are not evidenced by
certificates in your possession you may, if you wish, contact your Morgan
Stanley Dean Witter Financial Advisor and request that he or she effect the

                                       3
<PAGE>
tender on your behalf. If you elect to tender Common Shares through your Morgan
Stanley Dean Witter Financial Advisor, you do NOT have to complete the Letter of
Transmittal. If you do not have a brokerage account at DWR or if your Common
Shares are evidenced by certificates in your possession or you do not wish to
tender Common Shares through your Morgan Stanley Dean Witter Financial Advisor,
all or any portion of your Common Shares may be tendered only by completing and
signing the Letter of Transmittal and mailing or delivering it along with any
Common Share certificate(s) and any other required documents to Morgan Stanley
Dean Witter Trust FSB (the "Depositary").

    NEITHER THE TRUST NOR ITS BOARD OF TRUSTEES MAKES ANY RECOMMENDATION TO ANY
SHAREHOLDER AS TO WHETHER TO TENDER OR REFRAIN FROM TENDERING ANY OR ALL OF SUCH
SHAREHOLDER'S COMMON SHARES. SHAREHOLDERS ARE URGED TO EVALUATE CAREFULLY ALL
INFORMATION IN THE OFFER, CONSULT THEIR OWN INVESTMENT AND TAX ADVISERS AND MAKE
THEIR OWN DECISIONS WHETHER TO TENDER COMMON SHARES AND, IF SO, HOW MANY COMMON
SHARES TO TENDER.

    NO PERSON HAS BEEN AUTHORIZED TO MAKE ANY RECOMMENDATION ON BEHALF OF THE
TRUST AS TO WHETHER SHAREHOLDERS SHOULD TENDER COMMON SHARES PURSUANT TO THE
OFFER. NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS IN CONNECTION WITH THE OFFER OTHER THAN THOSE CONTAINED HEREIN
OR IN THE LETTER OF TRANSMITTAL. IF GIVEN OR MADE, SUCH RECOMMENDATION AND SUCH
INFORMATION AND REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE TRUST.

    Requests for additional copies of this Offer to Purchase and the Letter of
Transmittal should be directed to Morgan Stanley Dean Witter Trust FSB at the
addresses and telephone number set forth below. Questions and requests for
assistance may be directed to MSDW Advisors at the telephone number set forth
below.

<TABLE>
<S>                                                             <C>
February 16, 2000                                               MORGAN STANLEY DEAN WITTER
Morgan Stanley Dean Witter Advisors Inc.                        PRIME INCOME TRUST
(800) 869-NEWS                                                  Depositary:
Extension 0                                                     Morgan Stanley Dean Witter Trust FSB
                                                                By Mail:
                                                                Morgan Stanley Dean Witter Trust FSB
                                                                P.O. Box 984
                                                                Jersey City, New Jersey 07303

                                                                By Hand Delivery or Courier:
                                                                Morgan Stanley Dean Witter Trust FSB
                                                                Harborside Financial Center,
                                                                Plaza Two
                                                                Jersey City, New Jersey 07311
                                                                Attn: Morgan Stanley Dean Witter
                                                                     Prime Income Trust
</TABLE>

<TABLE>
<S>                                               <C>         <C>
                                                  Telephone:  (800) 869-NEWS
                                                              Extension 0
</TABLE>

                                       4
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
 SECTION                                                                                 PAGE
 -------                                                                               --------
 <C>                     <S>                                                           <C>
            1.           Price; Number of Common Shares..............................      6

            2.           Procedure for Tendering Common Shares.......................      6

            3.           Early Withdrawal Charge.....................................      8

            4.           Withdrawal Rights...........................................      9

            5.           Payment for Shares..........................................      9

            6.           Certain Conditions of the Offer.............................     10

            7.           Purpose of the Offer........................................     10

            8.           Plans or Proposals of the Trust.............................     11

            9.           Price Range of Common Shares; Dividends.....................     11

           10.           Interest of Trustees and Executive Officers; Transactions
                          and Arrangements Concerning the Common Shares..............     11

           11.           Certain Effects of the Offer................................     12

           12.           Source and Amount of Funds..................................     12

           13.           Certain Information about the Trust.........................     12

           14.           Additional Information......................................     13

           15.           Certain Federal Income Tax Consequences.....................     13

           16.           Extension of Tender Period; Termination; Amendments.........     13

           17.           Miscellaneous...............................................     14

           18.           Financial Statements--September 30, 1999....................     15

           19.           Financial Statements--September 30, 1998....................     39
</TABLE>

                                       5
<PAGE>
    1.  PRICE; NUMBER OF COMMON SHARES.  The Trust will, upon the terms and
subject to the conditions of the Offer, accept for payment (and thereby
purchase) 12,000,000 or such lesser number of its issued and outstanding Common
Shares which are properly tendered (and not withdrawn in accordance with
Section 4) prior to 12:00 A.M., midnight, New York City time, on March 17, 2000
(such time and date being hereinafter called the "Initial Expiration Date"). The
Trust reserves the right to extend the Offer. See Section 16. The later of the
Initial Expiration Date or the latest time and date to which the Offer is
extended is hereinafter called the "Expiration Date." The purchase price of the
Common Shares will be their NAV computed as of 4:00 P.M. New York City time on
the Expiration Date. The NAV on February 4, 2000 was $9.85 per Common Share. You
can obtain current NAV quotations from Morgan Stanley Dean Witter Advisors Inc.
("MSDW Advisors") by calling (800) 869-NEWS extension 0 during normal business
hours. Shareholders tendering Common Shares shall be entitled to receive all
dividends declared on or before the Expiration Date, but not yet paid on Common
Shares tendered pursuant to the Offer. See Section 9. The Trust will not pay
interest on the purchase price under any circumstances. AN EARLY WITHDRAWAL
CHARGE WILL BE IMPOSED ON MOST COMMON SHARES ACCEPTED FOR PAYMENT THAT HAVE BEEN
HELD FOR FOUR YEARS OR LESS. SEE SECTION 3.

    The Offer is being made to all shareholders of the Trust and is not
conditioned upon any minimum number of Common Shares being tendered. If the
number of Common Shares properly tendered prior to the Expiration Date and not
withdrawn is less than or equal to 12,000,000 Common Shares (or such greater
number of Common Shares as the Trust may elect to purchase pursuant to the
Offer), the Trust will, upon the terms and subject to the conditions of the
Offer, purchase at NAV all Common Shares so tendered. If more than 12,000,000
Common Shares are duly tendered prior to the expiration of the Offer and not
withdrawn, subject to the condition that there have been no changes in the
factors originally considered by the Board of Trustees when it determined to
make the Offer and the other conditions set forth in Section 6, the Trust will
either extend the Offer period, if necessary, and increase the number of Common
Shares that the Trust is offering to purchase to an amount which it believes
will be sufficient to accommodate the excess Common Shares tendered as well as
any Common Shares tendered during the extended Offer period or purchase
12,000,000 (or such larger number of Common Shares sought) of the Common Shares
tendered on a pro rata basis.

    On February 4, 2000, there were approximately 268,237,235 Common Shares
issued and outstanding and there were approximately 91,697 holders of record of
Common Shares. The Trust has been advised that no trustees, officers or
affiliates of the Trust intend to tender any Common Shares pursuant to the
Offer.

    The Trust reserves the right, in its sole discretion, at any time or from
time to time, to extend the period of time during which the Offer is open by
giving oral or written notice of such extension to the Depositary and making a
public announcement thereof. See Section 16. There can be no assurance, however,
that the Trust will exercise its right to extend the Offer. If the Trust
decides, in its sole discretion, to increase (except for any increase not in
excess of 2% of the outstanding Common Shares) or decrease the number of Common
Shares being sought and, at the time that notice of such increase or decrease is
first published, sent or given to holders of Common Shares in the manner
specified below, the Offer is scheduled to expire at any time earlier than the
tenth business day from the date that such notice is first so published, sent or
given, the Offer will be extended at least until the end of such ten business
day period.

    2.  PROCEDURE FOR TENDERING COMMON SHARES.

    PROPER TENDER OF COMMON SHARES.  If you have a brokerage account at DWR and
your Common Shares are not evidenced by certificates in your possession, you may
contact your Morgan Stanley Dean Witter Financial Advisor and request that he or
she tender your Common Shares to the Depositary on your behalf. If you choose to
have your Morgan Stanley Dean Witter Financial Advisor tender your Common
Shares, you do not have to submit any documents to the Depositary. If you do not
wish to have your Morgan Stanley Dean Witter Financial Advisor tender your
Common Shares or you do not have a brokerage account at DWR or you have
certificates for Common Shares in your possession, for Common Shares to be
properly tendered pursuant to the Offer, a properly completed and duly executed
Letter of Transmittal (or manually signed facsimile thereof) with any required
signature guarantees, any certificates for such Common Shares, and any other
documents required by the Letter of Transmittal, must be received on or before
the

                                       6
<PAGE>
Expiration Date by the Depositary at its address set forth on page 2 of this
Offer to Purchase. If you wish to tender your shares on the Expiration Date
following the close of business you may do so by calling (201) 938-6499.

    It is a violation of Section 10(b) of the Securities Exchange Act of 1934
(the "Exchange Act"), and Rule 14e-4 promulgated thereunder, for a person to
tender Common Shares for such person's own account unless the person so
tendering (a) owns such Common Shares or (b) owns other securities convertible
into or exchangeable for such Common Shares or owns an option, warrant or right
to purchase such Common Shares and intends to acquire Common Shares for tender
by conversion, exchange or exercise of such option, warrant or right.

    Section 10(b) and Rule 10b-4 provide a similar restriction applicable to the
tender or guarantee of a tender on behalf of another person.

    The acceptance of Common Shares by the Trust for payment will constitute a
binding agreement between the tendering shareholder and the Trust upon the terms
and subject to the conditions of the Offer, including the tendering
shareholder's representation that (i) such shareholder owns the Common Shares
being tendered within the meaning of Rule 10b-4 promulgated under the Exchange
Act and (ii) the tender of such Common Shares complies with Rule 10b-4.

    SIGNATURE GUARANTEES AND METHOD OF DELIVERY  (only applicable if you are a
shareholder not tendering Common Shares through your Morgan Stanley Dean Witter
Financial Advisor). Signatures on the Letter of Transmittal are not required to
be guaranteed unless (1) the Letter of Transmittal is signed by someone other
than the registered holder of the Common Shares tendered therewith, or
(2) payment for tendered Common Shares is to be sent to a payee other than the
registered owner of such Common Shares and/or to an address other than the
registered address of the registered owner of the Common Shares. In those
instances, all signatures on the Letter of Transmittal must be guaranteed by an
eligible guarantor acceptable to the Depositary (an "Eligible Guarantor")
(shareholders should contact the Depositary for a determination as to whether a
particular institution is such an Eligible Guarantor). If Common Shares are
registered in the name of a person or persons other than the signer of the
Letter of Transmittal or if payment is to be made to, unpurchased Common Shares
are to be registered in the name of, or any certificates for unpurchased Common
Shares are to be returned to any person other than the registered owner, then
the Letter of Transmittal and, if applicable, the tendered Common Share
certificates must be endorsed or accompanied by appropriate authorizations, in
either case signed exactly as such name or names appear on the registration of
the Common Shares with the signatures on the certificates or authorizations
guaranteed by an Eligible Guarantor. See Instructions 1 and 5 of the Letter of
Transmittal.

    Payment for Common Shares tendered and accepted for payment pursuant to the
Offer will be made (i) if you have tendered Common Shares directly to the
Depositary, only after receipt by the Depositary on or before the Expiration
Date of a properly completed and duly executed Letter of Transmittal (or
manually signed facsimile thereof) and any other documents required by the
Letter of Transmittal or (ii) if you have requested DWR to tender Common Shares
on your behalf, only after receipt by the Depositary on or before the Expiration
Date of a notice from DWR containing your name and the number of Common Shares
tendered. If your Common Shares are evidenced by certificates, those
certificates must be received by the Depositary on or prior to the Expiration
Date.

    The method of delivery of any documents, including certificates for Common
Shares, is at the election and risk of the party tendering Common Shares. If
documents are sent by mail, it is recommended that they be sent by registered
mail, properly insured, with return receipt requested.

    DETERMINATION OF VALIDITY.  All questions as to the validity, form,
eligibility (including time of receipt) and acceptance of tenders will be
determined by the Trust, in its sole discretion, whose determination shall be
final and binding. The Trust reserves the absolute right to reject any or all
tenders determined by it not to be in appropriate form or the acceptance of or
payment for which may, in the opinion of the Trust's counsel, be unlawful. The
Trust also reserves the absolute right to waive any of the conditions of the
Offer or any defect in any tender with respect to any particular Common Shares
or any particular shareholder, and the Trust's interpretations of the terms and
conditions of the Offer will be final and binding. Unless waived, any defects or
irregularities in connection with tenders must be cured within such times as the
Trust shall determine. Tendered Common Shares will not be accepted for payment
unless the defects or

                                       7
<PAGE>
irregularities have been cured within such time or waived. Neither the Trust,
DWR, the Depositary nor any other person shall be obligated to give notice of
any defects or irregularities in tenders, nor shall any of them incur any
liability for failure to give such notice.

    FEDERAL INCOME TAX WITHHOLDING.  To prevent backup federal income tax
withholding equal to 31% of the gross payments made pursuant to the Offer, each
shareholder who has not previously submitted a Substitute Form W-9 to the Trust
or does not otherwise establish an exemption from such withholding must notify
the Depositary of such shareholder's correct taxpayer identification number (or
certify that such taxpayer is awaiting a taxpayer identification number) and
provide certain other information by completing the Substitute Form W-9 included
in the Letter of Transmittal. Foreign shareholders who are individuals and who
have not previously submitted a Form W-8 to the Trust must do so in order to
avoid backup withholding.

    The Depositary will withhold 30% of the gross payments payable to a foreign
shareholder unless the Depositary determines that a reduced rate of withholding
or an exemption from withholding is applicable. (Exemption from backup
withholding does not exempt a foreign shareholder from the 30% withholding). For
this purpose, a foreign shareholder, in general, is a shareholder that is not
(i) a citizen or resident of the United States, (ii) a corporation, partnership
or other entity created or organized in or under the laws of the United States
or any political subdivision thereof, or (iii) an estate or trust the income of
which is subject to United States federal income taxation regardless of the
source of such income. The Depositary will determine a shareholder's status as a
foreign shareholder and eligibility for a reduced rate of, or an exemption from,
withholding by reference to the shareholder's address and to any outstanding
certificates or statements concerning eligibility for a reduced rate of, or
exemption from, withholding unless facts and circumstances indicate that
reliance is not warranted. A foreign shareholder who has not previously
submitted the appropriate certificates or statements with respect to a reduced
rate of, or exemption from, withholding for which such shareholder may be
eligible should consider doing so in order to avoid over-withholding. A foreign
shareholder may be eligible to obtain a refund of tax withheld if such
shareholder meets one of the three tests for capital gain or loss treatment
described in Section 15 or is otherwise able to establish that no tax or a
reduced amount of tax was due.

    For a discussion of certain other federal income tax consequences to
tendering shareholders, see Section 15.

    3.  EARLY WITHDRAWAL CHARGE.  The Depositary will impose an early withdrawal
charge (the "Early Withdrawal Charge") on most Common Shares accepted for
payment which have been held for four years or less. The Early Withdrawal Charge
will be imposed on a number of Common Shares accepted for payment from a record
holder of Common Shares the value of which exceeds the aggregate value at the
time the tendered Common Shares are accepted for payment of (a) all Common
Shares owned by such holder that were purchased more than four years prior to
such acceptance, (b) all Common Shares owned by such holder that were acquired
through reinvestment of dividends and distributions, and (c) the increase, if
any, of value of all other Common Shares owned by such holder (namely, those
purchased within the four years preceding acceptance for payment) over the
purchase price of such Common Shares. The Early Withdrawal Charge will be paid
to MSDW Advisors on behalf of the holder of the Common Shares. In determining
whether an Early Withdrawal Charge is payable, Common Shares accepted for
payment pursuant to the Offer shall be deemed to be those Common Shares
purchased earliest by the shareholder. Any Early Withdrawal Charge which is
required to be imposed will be made in accordance with the following schedule.

<TABLE>
<CAPTION>
                                                                EARLY
                     YEAR OF REPURCHASE                       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 $1000 worth of the Trust's Common
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
worth of Common Shares

                                       8
<PAGE>
without incurring an Early Withdrawal Charge. If the investor should submit for
repurchase pursuant to a tender offer $500 worth of Common Shares, an Early
Withdrawal Charge would be imposed on $300 worth of the Common 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.

    4.  WITHDRAWAL RIGHTS.  Except as otherwise provided in this Section 4,
tenders of Common Shares made pursuant to the Offer will be irrevocable. If you
desire to withdraw Common Shares tendered on your behalf by DWR, you may
withdraw by contacting your Morgan Stanley Dean Witter Financial Advisor and
instructing him or her to withdraw such Common Shares, or by calling (201)
938-6499 on the Expiration Date following the close of business. You may
withdraw Common Shares tendered at any time prior to the Expiration Date and, if
the Common Shares have not yet been accepted for payment by the Trust, at any
time after 12:01 A.M., New York City time, on April 12, 2000.

    To be effective, a written, telegraphic, telex or facsimile transmission
notice of withdrawal must be timely received by the Depositary at the address
set forth on page 2 of this Offer to Purchase. Any notice of withdrawal must
specify the name of the person having tendered the Common Shares to be
withdrawn, the number of Common Shares to be withdrawn, and, if certificates
representing such Common Shares have been delivered or otherwise identified to
the Depositary, the name of the registered holder(s) of such Common Shares as
set forth in such certificates if different from the name of the person
tendering such Common Shares. If certificates have been delivered to the
Depositary, then, prior to the release of such certificates, you must also
submit the certificate numbers shown on the particular certificates evidencing
such Common Shares and the signature on the notice of withdrawal must be
guaranteed by an Eligible Guarantor.

    All questions as to the form and validity (including time of receipt) of
notices of withdrawal will be determined by the Trust in its sole discretion,
whose determination shall be final and binding. None of the Trust, DWR, the
Depositary or any other person is or will be obligated to give any notice of any
defects or irregularities in any notice of withdrawal, and none of them will
incur any liability for failure to give any such notice. Common Shares properly
withdrawn shall not thereafter be deemed to be tendered for purposes of the
Offer. However, withdrawn Common Shares may be retendered by following the
procedures described in Section 2 prior to the Expiration Date.

    5.  PAYMENT FOR SHARES.  For purposes of the Offer, the Trust will be deemed
to have accepted for payment (and thereby purchased) Common Shares which are
tendered and not withdrawn when, as and if it gives oral or written notice to
the Depositary of its acceptance of such Common Shares for payment pursuant to
the Offer. Upon the terms and subject to the conditions of the Offer, the Trust
will, promptly after the Expiration Date, accept for payment (and thereby
purchase) Common Shares properly tendered prior to the Expiration Date.

    Payment for Common Shares purchased pursuant to the Offer will be made by
the Depositary out of funds made available to it by the Trust. The Depositary
will act as agent for tendering shareholders for the purpose of effecting
payment to the tendering shareholders. If your tender of Common Shares is
effected through DWR, payment for Common Shares will be deposited directly to
your DWR brokerage account. In all cases, payment for Common Shares accepted for
payment pursuant to the Offer will be made (i) if you have requested DWR to
tender Common Shares on your behalf, only after timely receipt by the Depositary
of a notice from DWR containing your name and the number of Common Shares
tendered or (ii) if you have tendered Common Shares directly to the Depositary,
only after timely receipt by the Depositary, as required pursuant to the Offer,
of a properly completed and duly executed Letter of Transmittal (or manually
signed facsimile thereof), any certificates representing such Common Shares, if
issued, and any other required documents. Certificates for Common Shares not
purchased (see Sections 1 and 6), or for Common Shares not tendered included in
certificates forwarded to the Depositary, will be returned promptly following
the termination, expiration or withdrawal of the Offer, without expense to the
tendering shareholder.

    The Trust will pay all transfer taxes, if any, payable on the transfer to it
of Common Shares purchased pursuant to the Offer. If, however, payment of the
purchase price is to be made to, or (in the circumstances permitted by the
Offer) if unpurchased Common Shares are to be registered in the name of any
person other than the registered holder, or if tendered certificates, if any,
are registered or the Common Shares tendered are held in the name of any person
other than the person signing the Letter of Transmittal, the

                                       9
<PAGE>
amount of any transfer taxes (whether imposed on the registered holder or such
other person) payable on account of the transfer to such person will be deducted
from the Purchase Price unless satisfactory evidence of the payment of such
taxes, or exemption therefrom, is submitted. Shareholders tendering Common
Shares shall be entitled to receive all dividends declared on or before the
Expiration Date, but not yet paid, on Common Shares tendered pursuant to the
Offer. The Trust will not pay any interest on the Purchase Price under any
circumstances. An Early Withdrawal Charge will be imposed on most Common Shares
accepted for payment that have been held for four years or less. See Section 3.
In addition, if certain events occur, the Trust may not be obligated to purchase
Common Shares pursuant to the Offer. See Section 6.

    Any tendering shareholder or other payee who has not previously submitted a
completed and signed Substitute Form W-9 and who fails to complete fully and
sign the Substitute Form W-9 in the Letter of Transmittal may be subject to
required federal income tax withholding of 31% of the gross proceeds paid to
such shareholder or other payee pursuant to the Offer. See Section 2.

    6.  CERTAIN CONDITIONS OF THE OFFER.  Notwithstanding any other provision of
the Offer, the Trust shall not be required to accept for payment, purchase or
pay for any Common Shares tendered, and may terminate or amend the Offer or may
postpone the acceptance for payment of, the purchase of and payment for Common
Shares tendered, if at any time at or before the time of purchase of any such
Common Shares, any of the following events shall have occurred (or shall have
been determined by the Trust to have occurred) which, in the Trust's sole
judgment in any such case and regardless of the circumstances (including any
action or omission to act by the Trust), makes it inadvisable to proceed with
the Offer or with such purchase or payment: (1) a secondary market develops for
the Common Shares; (2) in the reasonable business judgment of the Trustees,
there is not sufficient liquidity of the assets of the Trust; (3) such
transactions, if consummated, would (a) impair the Trust's status as a regulated
investment company under the Internal Revenue Code (which would make the Fund a
taxable entity, causing the Fund's taxable income to be taxed at the Trust
level) or (b) result in a failure to comply with applicable asset coverage
requirements; or (4) there is, in the Board of Trustees' judgment, 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 Common Shares if the tendered
Common Shares are purchased.

    The foregoing conditions are for the Trust's sole benefit and may be
asserted by the Trust regardless of the circumstances giving rise to any such
condition (including any action or inaction by the Trust), and any such
condition may be waived by the Trust in whole or in part, at any time and from
time to time in its sole discretion. The Trust's failure at any time to exercise
any of the foregoing rights shall not be deemed a waiver of any such right; the
waiver of any such right with respect to particular facts and circumstances
shall not be deemed a waiver with respect to any other facts or circumstances;
and each such right shall be deemed an ongoing right which may be asserted at
any time and from time to time. Any determination by the Trust concerning the
events described in this Section 6 shall be final and shall be binding on all
parties.

    If the Trust determines to terminate or amend the Offer or to postpone the
acceptance for payment of or payment for Common Shares tendered, it will, to the
extent necessary, extend the period of time during which the Offer is open as
provided in Section 16. Moreover, in the event any of the foregoing conditions
are modified or waived in whole or in part at any time, the Trust will promptly
make a public announcement of such waiver and may, depending on the materiality
of the modification or waiver, extend the Offer period as provided in
Section 16.

    7.  PURPOSE OF THE OFFER.  The Trust currently does not believe that an
active secondary market for its Common Shares exists or is likely to develop. In
recognition of the possibility that a secondary market may not develop for the
Common Shares of the Trust, or, if such a market were to develop, that the
Common Shares might trade at a discount, the Trustees have determined that it
would be in the best interest of its shareholders for the Trust to take action
to attempt to provide liquidity to shareholders or to reduce or eliminate any
future market value discount from NAV that might otherwise exist, respectively.
To that end,

                                       10
<PAGE>
the Trustees presently intend each quarter to consider making a tender offer to
purchase Common Shares at their NAV. The purpose of this Offer is to attempt to
provide liquidity to the holders of Common Shares. There can be no assurance
that this Offer will provide sufficient liquidity to all holders of Common
Shares that desire to sell their Common Shares or that the Trust will make any
such tender offer in the future.

    NEITHER THE TRUST NOR ITS BOARD OF TRUSTEES MAKES ANY RECOMMENDATION TO ANY
SHAREHOLDER AS TO WHETHER TO TENDER OR REFRAIN FROM TENDERING ANY OR ALL OF SUCH
SHAREHOLDER'S COMMON SHARES AND HAS NOT AUTHORIZED ANY PERSON TO MAKE ANY SUCH
RECOMMENDATION. SHAREHOLDERS ARE URGED TO EVALUATE CAREFULLY ALL INFORMATION IN
THE OFFER, CONSULT THEIR OWN INVESTMENT AND TAX ADVISERS AND MAKE THEIR OWN
DECISIONS WHETHER TO TENDER COMMON SHARES AND, IF SO, HOW MANY COMMON SHARES TO
TENDER.

    8.  PLANS OR PROPOSALS OF THE TRUST.  The Trust has no present plans or
proposals which relate to or would result in any extraordinary transaction such
as a merger, reorganization or liquidation involving the Trust; a sale or
transfer of a material amount of assets of the Trust other than in its ordinary
course of business; any material changes in the Trust's present capitalization
(except as resulting from the Offer or otherwise set forth herein); or any other
material changes in the Trust's structure or business.

    9.  PRICE RANGE OF COMMON SHARES; DIVIDENDS.  The Trust's NAV per Common
Share on February 4, 2000 was $9.85. You can obtain current NAV quotations from
MSDW Advisors by calling (800) 869-NEWS extension 0 or by calling (201) 938-6499
on the Expiration Date following the close of business. The Trust offers and
sells its Common Shares to the public on a continuous basis through Morgan
Stanley Dean Witter Distributors Inc. (the "Distributor") as principal
underwriter. The Trust is not aware of any secondary market trading for the
Common Shares. Dividends on the Common Shares are declared daily and paid
monthly. Shareholders tendering Common Shares shall be entitled to receive all
dividends declared on or before the Expiration Date, but not yet paid, on Common
Shares tendered pursuant to the Offer.

    10.  INTEREST OF TRUSTEES AND EXECUTIVE OFFICERS; TRANSACTIONS AND
ARRANGEMENTS CONCERNING THE COMMON SHARES.  As of February 4, 2000 the Trustees
and executive officers of the Trust as a group beneficially owned no Common
Shares. The Trust has been informed that no Trustee or executive officer of the
Trust intends to tender any Common Shares pursuant to the Offer.

    Except as set forth in this Section 10, based upon the Trust's records and
upon information provided to the Trust by its Trustees, executive officers and
affiliates (as such term is used in the Exchange Act), neither the Trust nor, to
the best of the Trust's knowledge, any of the Trustees or executive officers of
the Trust, nor any associates of any of the foregoing, has effected any
transactions in the Common Shares during the sixty business day period prior to
the date hereof.

    Except as set forth in this Offer to Purchase, neither the Trust nor, to the
best of the Trust's knowledge, any of its affiliates, Trustees or executive
officers, is a party to any contract, arrangement, understanding or relationship
with any other person relating, directly or indirectly, to the Offer with
respect to any securities of the Trust (including, but not limited to, any
contract, arrangement, understanding or relationship concerning the transfer or
the voting of any such securities, joint ventures, loan or option arrangements,
puts or calls, guaranties of loans, guaranties against loss or the giving or
withholding of proxies, consents or authorizations).

    The Trust is a party to a Hold Harmless Agreement with DWR pursuant to which
DWR indemnifies the Trust from any loss it may suffer as a result of the use of
DWR to effect a tender or withdrawal of Common Shares on behalf of its
customers.

    The Trust and the Depositary have entered into a Depositary Agreement dated
as of February 4, 2000, pursuant to which the Depositary will perform services
for the Trust in connection with the tender and withdrawal of Common Shares
pursuant to the Offer.

    The Trust currently is a party to an Investment Advisory Agreement with MSDW
Advisors (the "Advisor") under which the Trust accrues daily and pays monthly to
the Advisor an investment advisory fee equal to 0.90% of the average daily net
assets of the Trust up to $500 million; 0.85% of the portion of average daily
net assets over $500 million but not exceeding $1.5 billion; 0.825% of the
portion of the average daily net assets over $1.5 billion but not exceeding
$2.5 billion; and 0.80% of the portion of the

                                       11
<PAGE>
average daily net assets over $2.5 billion. The Trust also is a party to an
Administration Agreement with Morgan Stanley Dean Witter Services Company, Inc.,
a wholly-owned subsidiary of MSDW Advisors (the "Administrator") and a
Distribution Agreement with the Distributor. Under the Administration Agreement,
the Trust pays the Administrator a monthly fee at the annualized rate of 0.25%
of the Trust's average daily net assets. Under the Distribution Agreement, the
Trust offers and sells its Common Shares to the public on a continuous basis
through the Distributor as principal underwriter.

    11.  CERTAIN EFFECTS OF THE OFFER.  The purchase of Common Shares pursuant
to the Offer will have the effect of increasing the proportionate interest in
the Trust of shareholders who do not tender their Common Shares. If you retain
your Common Shares you will be subject to any increased risks that may result
from the reduction in the Trust's aggregate assets resulting from payment for
the tendered Common Shares (e.g., greater volatility due to decreased
diversification and higher expenses). However, the Trust believes that since the
Trust is engaged in a continuous offering of the Common Shares, those risks
would be reduced to the extent new Common Shares of the Trust are sold. All
Common Shares purchased by the Trust pursuant to the Offer will be held in
treasury pending disposition.

    12.  SOURCE AND AMOUNT OF FUNDS.  The total cost to the Trust of purchasing
12,000,000 Common Shares pursuant to the Offer will be approximately
$118,200,000 (assuming a NAV of $9.85 per Common Share on the Expiration Date)
plus the expenses incurred by the Trust in connection with the Offer. The Trust
anticipates that the Purchase Price for any Common Shares acquired pursuant to
the Offer will first be derived from cash on hand, such as proceeds from sales
of new Common Shares of the Trust and specified pay-downs from the participation
interests in senior corporate loans which it has acquired, and then from the
proceeds from the sale of cash equivalents held by the Trust. Although the Trust
is authorized to borrow money to finance the repurchase of Common Shares, the
Trustees believe that the Trust has sufficient liquidity to purchase the Common
Shares tendered pursuant to the Offer without utilizing such borrowing. However,
if, in the judgment of the Trustees, there is not sufficient liquidity of the
assets of the Trust to pay for tendered Common Shares, the Trust may terminate
the Offer. See Section 6.

    13.  CERTAIN INFORMATION ABOUT THE TRUST.  The Trust was organized as a
Massachusetts business trust, under the name "Allstate Prime Income Trust," on
August 17, 1989 and is a non-diversified, closed-end management investment
company under the Investment Company Act of 1940. The name was changed to "Prime
Income Trust" effective March 1, 1993 and then to "Morgan Stanley Dean Witter
Prime Income Trust," effective June 22, 1998. The Trust seeks a high level of
current income consistent with the preservation of capital by investing in a
professionally managed portfolio of interests in floating or variable rate
senior loans ("Senior Loans") to corporations, partnerships and other entities
("Borrowers"). Senior Loans may take the form of syndicated loans or of debt
obligations of Borrowers issued directly to investors in the form of debt
securities ("Senior Notes"). Although the Trust's NAV will vary, the Trust's
policy of acquiring interests in floating or variable rate Senior Loans is
expected to minimize fluctuations in the Trust's NAV as a result of changes in
interest rates. Senior Loans in which the Trust invests generally pay interest
at rates which are periodically redetermined by reference to a base lending rate
plus a premium. These base lending rates are generally the prime rate offered by
a major United States bank ("Prime Rate"), the London Inter-Bank Offered Rate,
the certificate of deposit rate or other base lending rates used by commercial
lenders. The Trust seeks to achieve over time an effective yield that will
exceed money market rates and will track the movements in the published Prime
Rate of major United States banks, although it may not equal the Prime Rate. The
Senior Loans in the Trust's portfolio at all times have a dollar-weighted
average time until next interest rate redetermination of 90 days or less. As a
result, as short-term interest rates increase, the interest payable to the Trust
from its investments in Senior Loans should increase, and as short-term interest
rates decrease, the interest payable to the Trust on its investments in Senior
Loans should decrease. The amount of time required to pass before the Trust
realizes the effects of changing short-term market interest rates on its
portfolio varies with the dollar-weighted average time until next interest rate
redetermination on securities in the Trust's portfolio.

    The Trust has registered as a "non-diversified" investment company so that,
subject to its investment restrictions, it is able to invest more than 5% of the
value of its assets in the obligations of any single issuer, including Senior
Loans of a single Borrower or participations in Senior Loans purchased from a
single lender or selling participant. However, the Trust does not intend to
invest more than 10% of the value of its total assets in interests in Senior
Loans of a single Borrower. To the extent the Trust invests its assets in

                                       12
<PAGE>
obligations of a more limited number of issuers than a diversified investment
company, the Trust will be more susceptible than a more widely diversified
investment company to any single corporate, economic, political or regulatory
occurrence.

    The principal executive offices of the Trust are located at Two World Trade
Center, New York, N.Y. 10048.

    Reference is hereby made to Section 9 of this Offer to Purchase and the
financial statements attached hereto as Exhibit A which are incorporated herein
by reference.

    14.  ADDITIONAL INFORMATION.  The Trust has filed a statement on Schedule
13E-4 with the Securities and Exchange Commission (the "Commission") which
includes certain additional information relating to the Offer. Such material may
be inspected and copied at prescribed rates at the Commission's public reference
facilities at Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 10549
and 75 Park Place, New York, New York 10007. Copies of such material may also be
obtained by mail at prescribed rates from the Public Reference Branch of the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549.

    15.  CERTAIN FEDERAL INCOME TAX CONSEQUENCES.  The following discussion is a
general summary of the federal income tax consequences of a sale of Common
Shares pursuant to the Offer. Shareholders should consult their own tax advisers
regarding the tax consequences of a sale of Common Shares pursuant to the Offer,
as well as the effects of state, local and foreign tax laws. See also "Federal
Income Tax Withholding," supra.

    The sale of Common Shares pursuant to the Offer will be a taxable
transaction for Federal income tax purposes, either as a "sale or exchange," or
under certain circumstances, as a "dividend." Under Section 302(b) of the
Internal Revenue Code of 1986, as amended (the "Code"), a sale of Common Shares
pursuant to the Offer generally will be treated as a "sale or exchange" if the
receipt of cash: (a) results in a "complete termination" of the shareholder's
interest in the Trust, (b) is "substantially disproportionate" with respect to
the shareholder, or (c) is "not essentially equivalent to a dividend" with
respect to the shareholder. In determining whether any of these tests has been
met, Common Shares actually owned, as well as Common Shares considered to be
owned by the shareholder by reason of certain constructive ownership rules set
forth in Section 318 of the Code, generally must be taken into account. If any
of these three tests for "sale or exchange" treatment is met, a shareholder will
recognize gain or loss equal to the difference between the amount of cash
received pursuant to the Offer and the tax basis of the Common Shares sold. If
such Common Shares are held as a capital asset, the gain or loss will be a
capital gain or loss.

    If none of the tests set forth in Section 302(b) of the Code is met, amounts
received by a shareholder who sells Common Shares pursuant to the Offer will be
taxable to the shareholder as a "dividend" to the extent of such shareholder's
allocable share of the Trust's current or accumulated earnings or profits, and
the excess of such amounts received over the portion that is taxable as a
dividend would constitute a non-taxable return of capital (to the extent of the
shareholder's tax basis in the Common Shares sold pursuant to the Offer) and any
amounts in excess of the shareholder's tax basis would constitute taxable gain.
If the amounts received by a tendering Shareholder are treated as a "dividend,"
the tax basis in the Common Shares tendered to the Trust will be transferred to
any remaining Common Shares held by such shareholder. In addition, if a tender
of Common Shares is treated as a "dividend" to a tendering shareholder, the
Internal Revenue Service may take the position that a constructive distribution
under Section 305(c) of the Code may result to a shareholder whose proportionate
interest in the earnings and assets of the Trust has been increased by such
tender.

    16.  EXTENSION OF TENDER PERIOD; TERMINATION; AMENDMENTS.  The Trust
reserves the right, at any time and from time to time, to extend the period of
time during which the Offer is pending by making a public announcement thereof.
In the event that the Trust so elects to extend the tender period, the NAV for
the Common Shares tendered will be computed as of 4:00 P.M. New York City time
on the Expiration Date, as extended. During any such extension, all Common
Shares previously tendered and not purchased or withdrawn will remain subject to
the Offer. The Trust also reserves the right, at any time and from time to time
up to and including the Expiration Date, to (a) terminate the Offer and not to
purchase or pay for any Common Shares or, subject to applicable law, postpone
payment for Common Shares upon the occurrence of any of the conditions specified
in Section 6 and (b) amend the Offer in any respect by making a public
announcement thereof. Such public announcement will be issued no later than
9:00 A.M. New York City

                                       13
<PAGE>
time on the next business day after the previously scheduled Expiration Date and
will disclose the approximate number of Common Shares tendered as of that date.
Without limiting the manner in which the Trust may choose to make a public
announcement of extension, termination or amendment, except as provided by
applicable law (including Rule 13e-4(e)(2)), the Trust shall have no obligation
to publish, advertise or otherwise communicate any such public announcement.

    If the Trust materially changes the terms of the Offer or the information
concerning the Offer, or if it waives a material condition of the Offer, the
Trust will extend the Offer to the extent required by Rules 13e-4(d)(2) and
13e-4(e)(2) promulgated under the Exchange Act. These rules require that the
minimum period during which an offer must remain open following material changes
in the terms of the offer or information concerning the offer (other than a
change in price or a change in percentage of securities sought) will depend on
the facts and circumstances, including the relative materiality of such terms or
information. If (i) the Trust increases or decreases the price to be paid for
Common Shares, or the Trust increases the number of Common Shares being sought
by an amount exceeding 2% of the outstanding Common Shares, or the Trust
decreases the number of Common Shares being sought and (ii) the Offer is
scheduled to expire at any time earlier than the expiration of a period ending
on the tenth business day from, and including, the date that notice of such
increase or decrease is first published, sent or given, the Offer will be
extended at least until the expiration of such period of ten business days.

    17.  MISCELLANEOUS.  The Offer is not being made to, nor will the Trust
accept tenders from, owners of Common Shares in any jurisdiction in which the
Offer or its acceptance would not comply with the securities or Blue Sky laws of
such jurisdiction. The Trust is not aware of any jurisdiction in which the
making of the Offer or the tender of Common Shares would not be in compliance
with the laws of such jurisdiction. However, the Trust reserves the right to
exclude holders in any jurisdiction in which it is asserted that the Offer
cannot lawfully be made. So long as the Trust makes a good-faith effort to
comply with any state law deemed applicable to the Offer, the Trust believes
that the exclusions of holders residing in such jurisdiction is permitted under
Rule 13e-4(f)(9) promulgated under the Exchange Act. In any jurisdiction the
securities or Blue Sky laws of which require the Offer to be made by a licensed
broker or dealer, the Offer shall be deemed to be made on the Trust's behalf by
Dean Witter Reynolds Inc.

                                          Morgan Stanley Dean Witter Prime
                                          Income Trust

February 16, 2000

                                       14
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
            SENIOR COLLATERALIZED TERM LOANS (a) (b) (95.0%)
            ACCIDENT & HEALTH INSURANCE (0.2%)
 $  2,475   BRW Acquisition, Inc........................................       7.25%        07/10/06  $    2,471,634
    2,475   BRW Acquisition, Inc........................................        7.50        07/10/07       2,471,560
                                                                                                      --------------
                                                                                                           4,943,194
                                                                                                      --------------
            AEROSPACE (1.5%)
   14,813   Avborne, Inc................................................   8.56 to 8.75     06/30/05      14,805,346
    6,965   Decrane Aircraft Holdings, Inc..............................        8.76        04/23/06       6,956,851
   17,382   Fairchild Holding Corp......................................   8.63 to 8.68     04/30/06      17,380,511
                                                                                                      --------------
                                                                                                          39,142,708
                                                                                                      --------------
            AIR FREIGHT/DELIVERY SERVICES (1.6%)
   12,882   Atlas Freighter Leasing II, Inc.............................        7.50        05/29/04      12,867,858
    8,531   Erickson Air-Crane Co., L.L.C...............................        9.01        12/31/04       8,520,756
    3,883   Evergreen International Aviation, Inc.......................        8.62        05/31/02       3,881,840
    6,201   Evergreen International Aviation, Inc.......................        8.54        05/07/03       6,200,382
    8,447   First Security Bank, National Association as Owner
              Trustee...................................................        8.68        05/07/03       8,445,753
                                                                                                      --------------
                                                                                                          39,916,589
                                                                                                      --------------
            APPAREL (2.3%)
   14,462   American Marketing Industries, Inc..........................   9.06 to 9.25     11/29/02      14,458,548
    3,900   American Marketing Industries, Inc..........................   9.06 to 9.25     11/30/03       3,899,086
    2,709   American Marketing Industries, Inc..........................   9.06 to 9.25     11/30/04       2,708,138
    4,186   American Marketing Industries, Inc..........................   9.06 to 9.25     11/30/05       4,185,358
    7,039   Arena Brands, Inc...........................................   8.66 to 9.39     06/01/02       7,027,781
    1,038   Arena Brands, Inc. (Revolver)...............................  8.62 to 11.00     06/01/02       1,038,320
   18,000   St. John Knits International,
              Inc.......................................................        9.38        07/31/07      17,985,780
    5,985   The William Carter Co.......................................   7.79 to 7.97     10/30/03       5,980,940
                                                                                                      --------------
                                                                                                          57,283,951
                                                                                                      --------------
            AUTO PARTS - O.E.M. (2.5%)
    9,900   Accuride Corp...............................................        7.06        01/21/06       9,898,911
    7,500   Accuride Corp...............................................        7.81        01/21/07       7,499,025
   11,542   AP Automotive Systems, Inc..................................   7.56 to 7.69     12/19/05      11,541,601
    6,316   J.L. French Automotive Castings, Inc........................        8.13        10/21/06       6,315,788
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       15
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
 $ 15,000   Meridian Automotive Systems, Inc............................       8.25%        05/25/06  $   14,972,400
    5,960   Special Devices, Inc........................................        8.56        12/15/05       5,959,167
    7,940   Stoneridge, Inc.............................................        9.01        12/31/05       7,930,710
                                                                                                      --------------
                                                                                                          64,117,602
                                                                                                      --------------
            AUTOMOTIVE AFTERMARKET (0.2%)
    2,056   Safelite Glass Corp.........................................        8.50        12/23/04       2,053,787
    2,056   Safelite Glass Corp.........................................        8.75        12/23/05       2,053,807
                                                                                                      --------------
                                                                                                           4,107,594
                                                                                                      --------------
            BOOKS/MAGAZINE (1.9%)
   18,886   Advanstar Communications,
              Inc.......................................................        7.88        04/30/05      18,885,622
    4,991   Advanstar Communications,
              Inc.......................................................        8.38        06/30/07       4,990,842
   25,000   Ziff-Davis, Inc.............................................        8.81        03/31/06      24,996,000
                                                                                                      --------------
                                                                                                          48,872,464
                                                                                                      --------------
            BROADCAST/MEDIA (4.8%)
   20,000   Benedek Broadcasting Corp...................................   8.69 to 8.70     11/20/07      19,964,741
   10,000   Black Entertainment Television, Inc.........................        6.94        06/30/06       9,998,800
    9,750   Capstar Broadcasting Partners,
              Inc.......................................................   7.31 to 7.38     11/30/04       9,693,758
    9,800   Capstar Broadcasting Partners,
              Inc.......................................................        7.69        05/31/05       9,799,496
    6,400   Chancellor Media Corp.......................................        7.56        06/30/05       6,400,103
    1,339   Chancellor Media Corp. (Revolver)...........................   7.56 to 9.38     06/30/05       1,338,750
    2,850   Cumulus Media, Inc..........................................        8.38        09/30/07       2,849,971
    1,900   Cumulus Media, Inc..........................................        8.51        02/28/08       1,899,981
   15,000   Emmis Communications Corp...................................        7.94        02/28/07      14,846,700
    6,579   Latin Communications, Inc...................................       13.00        02/28/04       6,578,804
   19,000   Sinclair Broadcast Group, Inc...............................        6.56        09/15/05      18,996,580
    7,425   Spartan Communications, Inc.................................        8.63        06/30/05       7,424,852
   10,000   Susquehanna Media Co........................................        7.94        06/30/08      10,000,100
                                                                                                      --------------
                                                                                                         119,792,636
                                                                                                      --------------
            BUILDING MATERIALS (0.5%)
    3,011   Atrium Co., Inc.............................................        8.53        06/30/05       3,007,328
    4,316   Atrium Co., Inc.............................................   8.56 to 8.78     06/30/06       4,314,591
    6,000   Dayton Superior Corp........................................        8.13        09/29/05       5,999,880
                                                                                                      --------------
                                                                                                          13,321,799
                                                                                                      --------------
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       16
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
            CABLE TELEVISION (3.6%)
 $ 45,000   Charter Communications Operating, LLC.......................  7.81 to 7.89%     03/18/08  $   44,996,911
   10,750   Classic Cable, Inc..........................................   8.00 to 8.25     01/31/08      10,749,770
   17,500   General Cable Corp..........................................        8.25        05/27/07      17,481,100
   15,000   RCN Corp....................................................        8.88        06/03/07      14,996,550
    4,000   TWFanch-One Co..............................................        8.00        12/31/07       3,990,520
                                                                                                      --------------
                                                                                                          92,214,851
                                                                                                      --------------
            CASINO/GAMBLING (0.9%)
    5,519   Alliance Gaming Corp........................................   8.56 to 8.62     01/31/05       5,517,653
    2,203   Alliance Gaming Corp........................................   8.81 to 8.87     07/31/05       2,202,624
    5,000   Harrah's Jazz Co............................................        6.06        04/30/05       4,997,450
   10,000   Palace Station Hotel & Casino, Inc..........................        7.87        12/31/05       9,999,900
                                                                                                      --------------
                                                                                                          22,717,627
                                                                                                      --------------
            CELLULAR TELEPHONE (1.8%)
    7,444   Centenial Cellular Operating
              Co. LLC...................................................        8.64        05/31/07       7,408,988
    7,444   Centenial Cellular Operating
              Co. LLC...................................................        8.89        11/30/07       7,408,839
   30,602   Microcell Connexions, Inc...................................   8.51 to 8.63     03/01/06      30,594,521
                                                                                                      --------------
                                                                                                          45,412,348
                                                                                                      --------------
            COAL MINING (0.6%)
   14,813   Quaker Coal Company, Inc....................................       11.75        06/30/06      14,812,500
                                                                                                      --------------
            CONSTRUCTION/AGRICULTURAL EQUIPMENT/TRUCKS (0.4%)
   10,000   Terex Corp..................................................        8.68        03/06/06      10,000,000
                                                                                                      --------------
            CONSUMER SPECIALTIES (1.0%)
    2,375   American Safety Razor Co....................................   9.12 to 9.20     04/30/07       2,374,522
    8,307   Amscan Holdings, Inc........................................   7.75 to 7.91     12/31/04       8,298,994
    5,563   Jet Plastica Industries, Inc................................   7.69 to 8.00     12/31/02       5,558,935
    8,891   Jet Plastica Industries, Inc................................   8.19 to 8.50     12/31/04       8,882,738
                                                                                                      --------------
                                                                                                          25,115,189
                                                                                                      --------------
            CONSUMER SUNDRIES (0.8%)
      324   Corning Consumer Products
              Co. (Revolver)............................................   7.00 to 7.51     04/09/05         323,527
   15,840   Corning Consumer Products
              Co........................................................        7.38        10/09/06      15,837,624
    3,055   The Boyds Collection, Ltd...................................   7.00 to 7.56     04/21/06       3,053,528
                                                                                                      --------------
                                                                                                          19,214,679
                                                                                                      --------------
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       17
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
            CONSUMER/BUSINESS SERVICES (2.7%)
 $ 16,951   Bridge Information Systems,
              Inc.......................................................  8.06 to 8.19%     05/29/03  $   16,951,111
    2,556   Bridge Information Systems,
              Inc. (Revolver)...........................................   8.19 to 9.50     05/29/03       2,555,572
   19,950   Bridge Information Systems, Inc.............................   8.06 to 8.31     05/29/05      19,949,202
    9,381   InfoUSA, Inc................................................        8.94        06/30/06       9,381,102
    4,833   Prime Succession, Inc.......................................   8.94 to 9.25     08/01/03       4,833,602
    4,833   Prime Succession, Inc. (Participation: Goldman Sachs &
              Co.) (d)..................................................   8.94 to 9.25     08/01/03       4,833,602
    9,601   Rose Hills Co...............................................        8.31        12/01/03       9,590,387
                                                                                                      --------------
                                                                                                          68,094,578
                                                                                                      --------------
            CONTAINERS/PACKAGING (2.0%)
    1,778   Graham Packaging Co.........................................        8.25        01/31/06       1,774,540
    8,172   Graham Packaging Co.........................................   8.38 to 8.81     01/31/07       8,162,509
    7,500   Impaxx, Inc.................................................   8.81 to 9.13     12/31/05       7,494,075
   10,000   LLS Corp....................................................   8.30 to 8.75     07/31/06       9,994,363
    4,987   Mediapak Corp...............................................  8.77 to 10.25     12/31/05       4,980,708
    4,987   Mediapak Corp...............................................  8.88 to 10.50     12/31/06       4,981,490
    4,822   MPC Packaging Corp..........................................       10.13        05/30/04       4,822,454
    9,174   Packaging Corporation of America............................   8.63 to 9.50     04/12/07       9,172,115
                                                                                                      --------------
                                                                                                          51,382,254
                                                                                                      --------------
            DISCOUNT CHAINS (0.5%)
   11,528   Tuesday Morning Corp........................................        7.88        12/29/04      11,527,594
                                                                                                      --------------
            DIVERSIFIED COMMERCIAL SERVICES (0.4%)
    9,950   Building One Services Corp..................................   8.31 to 8.50     04/30/04       9,931,582
                                                                                                      --------------
            DIVERSIFIED MANUFACTURING (1.6%)
    6,197   Chatham Technologies, Inc...................................        8.44        08/18/03       6,196,703
    7,914   Chatham Technologies, Inc...................................        8.94        08/18/05       7,914,649
    3,000   Desa International, Inc.....................................        8.98        11/26/03       2,999,670
    6,755   Desa International, Inc.....................................        9.00        11/26/04       6,747,772
    6,860   Doskocil Manufacturing Co...................................        9.38        09/30/04       6,858,559
    9,554   Insilco Corp................................................        9.13        11/24/05       9,554,029
                                                                                                      --------------
                                                                                                          40,271,382
                                                                                                      --------------
            DRUGSTORE CHAINS (0.7%)
    9,850   Duane Reade, Inc............................................        8.06        02/15/05       9,849,015
    6,683   Duane Reade, Inc............................................   8.31 to 8.56     02/15/06       6,681,897
                                                                                                      --------------
                                                                                                          16,530,912
                                                                                                      --------------
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       18
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
            E.D.P. SERVICES (0.3%)
 $ 14,738   DecisionOne Corp............................................       10.00%       08/07/04  $    8,105,625
                                                                                                      --------------
            EDUCATION (0.4%)
    9,258   Children's Discovery Centers of America.....................   7.81 to 7.94     06/30/05       9,235,720
                                                                                                      --------------
            ELECTRONIC COMPONENTS (1.9%)
    7,481   Communications Instruments,
              Inc.......................................................   8.63 to 8.69     03/15/04       7,480,964
   13,944   Dynamic Details, Inc........................................        7.88        04/22/05      13,943,721
    7,000   Knowles Electronics, Inc....................................        8.60        06/29/07       6,987,680
    2,968   Viasystems Group, Inc.......................................        8.75        03/31/04       2,964,622
    2,443   Viasystems Group, Inc.......................................        8.79        06/30/04       2,440,274
   14,000   Viasystems Group, Inc.......................................   9.18 to 9.19     06/30/05      13,997,495
                                                                                                      --------------
                                                                                                          47,814,756
                                                                                                      --------------
            ELECTRONIC PRODUCTION EQUIPMENT (0.2%)
    5,706   Telex Communications, Inc...................................   8.96 to 8.98     11/06/04       5,704,728
                                                                                                      --------------
            ENERGY (0.6%)
   15,000   AES Texas Funding, LLC......................................        8.13        03/06/00      14,999,700
                                                                                                      --------------
            ENTERTAINMENT & LEISURE (1.1%)
    7,500   MGM Studios, Inc............................................        8.25        03/31/06       7,499,475
    5,354   Premier Parks, Inc..........................................   7.44 to 9.00     03/31/06       5,354,483
   16,038   Six Flag Theme Parks, Inc...................................        8.19        11/30/04      16,037,256
                                                                                                      --------------
                                                                                                          28,891,214
                                                                                                      --------------
            ENVIRONMENTAL SERVICES (2.5%)
   22,727   Allied Waste Industries, Inc................................        8.19        07/30/06      22,727,273
   27,273   Allied Waste Industries, Inc................................        8.44        07/30/07      27,272,763
   12,903   Environmental Systems Products Holdings, Inc................        9.51        09/30/05      12,887,404
                                                                                                      --------------
                                                                                                          62,887,440
                                                                                                      --------------
            FINANCE (0.7%)
    8,990   Blackstone Capital
              Company II, L.L.C.........................................       11.75        11/30/00       8,990,066
    8,830   Wasserstein/C&A Holdings, L.L.C.............................       10.00        11/30/00       8,813,283
                                                                                                      --------------
                                                                                                          17,803,349
                                                                                                      --------------
            FLUID CONTROLS (0.4%)
    4,988   Mueller Group, Inc..........................................        8.69        08/16/06       4,979,520
    4,988   Mueller Group, Inc..........................................        8.94        08/16/07       4,979,520
                                                                                                      --------------
                                                                                                           9,959,040
                                                                                                      --------------
            FOOD CHAINS (0.5%)
   12,438   Big V Supermarkets, Inc.....................................        8.94        08/10/03      12,437,624
                                                                                                      --------------
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       19
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
            FOOD & BEVERAGES (2.2%)
 $  9,250   B&G Foods, Inc..............................................       8.63%        03/03/06  $    9,249,815
    7,425   Eagle Family Foods, Inc.....................................   8.69 to 9.01     12/31/05       7,424,421
    8,415   Favorite Brands International, Inc..........................        8.81        05/19/05       8,404,525
   12,375   Leon's Bakery, Inc..........................................        8.38        06/03/05      12,374,752
    6,252   Specialty Food Corp. (Revolver).............................   8.63 to 8.64     01/31/01       6,251,958
   10,725   Specialty Food Corp.........................................        9.91        01/31/01      10,723,961
                                                                                                      --------------
                                                                                                          54,429,432
                                                                                                      --------------
            HOME FURNISHINGS (0.5%)
    3,005   Sealy Mattress Co...........................................        7.88        12/15/04       3,001,814
    2,165   Sealy Mattress Co...........................................        8.13        12/15/05       2,162,662
    2,766   Sealy Mattress Co...........................................        8.38        12/15/06       2,763,872
    1,424   Simmons Co..................................................        8.69        10/29/05       1,424,533
    3,563   Simmons Co..................................................        8.94        10/29/06       3,562,606
                                                                                                      --------------
                                                                                                          12,915,487
                                                                                                      --------------
            HOSPITAL/NURSING MANAGEMENT (3.6%)
    5,969   Columbia - HealthONE, LLC...................................        8.88        06/30/05       5,968,846
    7,014   Community Health Systems, Inc...............................        8.50        12/31/03       7,005,352
    7,014   Community Health Systems, Inc...............................        9.00        12/31/04       7,005,352
    5,232   Community Health Systems, Inc...............................        9.25        12/31/05       5,226,650
    4,410   GEAC/Multicare Co., Inc.....................................   9.49 to 9.51     09/30/04       4,404,957
    1,466   GEAC/Multicare Co., Inc.....................................        9.74        06/01/05       1,466,089
    4,300   Genesis Health Ventures, Inc................................   8.73 to 8.81     09/30/04       4,299,431
    4,290   Genesis Health Ventures, Inc................................   8.98 to 9.06     06/01/05       4,289,289
   17,194   Integrated Health Services, Inc.............................   8.56 to 8.88     09/30/04      17,181,195
    3,684   Magellan Health Services, Inc...............................        8.00        02/12/05       3,680,985
    3,684   Magellan Health Services, Inc...............................        8.25        02/12/06       3,680,949
    5,011   Paracelsus Healthcare Corp..................................        8.38        03/31/03       5,011,011
    7,943   Paracelsus Healthcare Corp..................................        8.63        03/31/04       7,942,698
   14,552   Ventas Realty Limited Partnership...........................        8.14        10/30/99      14,551,938
                                                                                                      --------------
                                                                                                          91,714,742
                                                                                                      --------------
            HOTELS/RESORTS (3.0%)
   15,000   Felcor Lodging Trust, Inc...................................        7.88        03/31/04      14,999,850
   10,395   Meristar Hospitality Operating Partnership, L.P.............        7.38        01/31/04      10,394,896
    4,727   Pebble Beach Company........................................        8.63        07/30/06       4,727,226
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       20
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
 $ 20,000   Starwood Hotels & Resorts Worldwide, Inc....................       9.13%        02/23/03  $   19,999,600
   10,000   Wyndham International, Inc..................................        8.81        06/30/04       9,999,400
   15,000   Wyndham International, Inc..................................        9.06        06/30/06      14,999,250
                                                                                                      --------------
                                                                                                          75,120,222
                                                                                                      --------------
            INDUSTRIAL SPECIALTIES (0.8%)
   13,301   Advanced Glassfiber Yarns
              LLC.......................................................        9.01        09/30/05      13,285,848
    5,955   Panolam Industries International, Inc.......................   8.88 to 8.98     12/31/05       5,954,395
                                                                                                      --------------
                                                                                                          19,240,243
                                                                                                      --------------
            INSURANCE BROKERS/SERVICES (0.5%)
    7,271   Acordia, Inc................................................        7.69        12/31/04       7,257,849
    2,910   Willis Corroon Corp.........................................        7.98        11/19/07       2,909,738
    2,910   Willis Corroon Corp.........................................        8.23        02/19/08       2,909,709
                                                                                                      --------------
                                                                                                          13,077,296
                                                                                                      --------------
            MAJOR CHEMICALS (0.6%)
    7,500   Huntsman ICI Chemicals LLC..................................        8.50        06/30/07       7,491,075
    7,500   Huntsman ICI Chemicals LLC..................................        8.63        06/30/08       7,499,850
                                                                                                      --------------
                                                                                                          14,990,925
                                                                                                      --------------
            MANAGED HEALTH CARE (0.5%)
    9,595   Interim Healthcare, Inc.....................................   8.64 to 9.24     02/29/04       9,590,068
    3,559   Interim Healthcare, Inc.....................................   9.03 to 9.49     02/28/05       3,554,500
                                                                                                      --------------
                                                                                                          13,144,568
                                                                                                      --------------
            MEDICAL SPECIALTIES (1.3%)
    2,954   Alaris Medical Systems, Inc.................................        7.94        11/01/03       2,953,183
    2,954   Alaris Medical Systems, Inc.................................        7.94        11/01/04       2,953,183
    4,641   Alaris Medical Systems, Inc.................................        7.94        05/01/05       4,640,275
    6,234   Dade Behring, Inc...........................................  8.24 to 10.13     06/30/06       6,233,813
    6,234   Dade Behring, Inc...........................................  8.44 to 10.38     06/30/07       6,233,532
    2,455   Medical Specialties Group, Inc..............................        8.88        06/30/01       2,454,496
    7,136   Medical Specialties Group, Inc..............................        9.63        06/30/04       7,136,221
                                                                                                      --------------
                                                                                                          32,604,703
                                                                                                      --------------
            MEDICAL/NURSING SERVICES (2.5%)
    1,965   Alliance Imaging, Inc.......................................   7.88 to 8.00     12/18/03       1,964,927
    4,913   Alliance Imaging, Inc.......................................   7.88 to 8.44     06/18/04       4,910,574
   12,902   Alliance Imaging, Inc.......................................   7.88 to 8.44     12/18/04      12,901,416
    6,983   Alliance Imaging, Inc.......................................   8.13 to 8.69     06/18/05       6,979,654
    8,147   FHC Health Systems, Inc.....................................        7.81        04/30/05       8,145,572
    8,147   FHC Health Systems, Inc.....................................        8.06        04/30/06       8,145,572
   10,400   Quest Diagnostics, Inc......................................        8.72        08/16/06      10,398,752
    9,600   Quest Diagnostics, Inc......................................   9.27 to 9.7      08/16/07       9,592,944
                                                                                                      --------------
                                                                                                          63,039,411
                                                                                                      --------------
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       21
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
            MOTOR VEHICLES (0.1%)
 $  3,400   Asbury Automotive Texas Holdings L.L.C......................       9.06%        03/31/05  $    3,399,830
                                                                                                      --------------
            MOVIES/ENTERTAINMENT (1.3%)
    9,967   Panavision, Inc.............................................   8.79 to 8.94     03/31/05       9,947,948
    8,904   United Artists Theatre Co...................................  9.69 to 11.50     04/21/06       8,903,589
   13,355   United Artists Theatre Co...................................  9.69 to 11.50     04/21/07      13,341,088
                                                                                                      --------------
                                                                                                          32,192,625
                                                                                                      --------------
            MULTI-SECTOR COMPANIES (1.1%)
    2,205   Mafco Finance Corp. (Revolver)..............................   9.31 to 9.52     04/28/00       2,202,735
   25,442   Mafco Finance Corp..........................................        9.52        04/28/00      25,413,304
                                                                                                      --------------
                                                                                                          27,616,039
                                                                                                      --------------
            NEWSPAPERS (0.2%)
    4,925   21st Century Newspapers, Inc................................        7.81        09/15/05       4,924,557
                                                                                                      --------------
            OFFICE EQUIPMENT/SUPPLIES (1.4%)
   14,962   Global Imaging Systems, Inc.................................        8.63        06/30/06      14,962,201
   19,970   US Office Products Co.......................................        7.89        06/09/06      19,970,170
                                                                                                      --------------
                                                                                                          34,932,371
                                                                                                      --------------
            OILFIELD SERVICES/EQUIPMENT (1.8%)
   20,000   Plains Scurlock Permian, L.P................................        8.47        05/12/04      19,997,600
   15,000   Transmontaigne, Inc.........................................        8.69        06/30/06      15,000,450
   10,000   US Synthetic Corp...........................................   8.81 to 9.02     05/31/05       9,989,679
                                                                                                      --------------
                                                                                                          44,987,729
                                                                                                      --------------
            OTHER CONSUMER SERVICES (0.6%)
    7,800   PCA International, Inc......................................        8.76        08/25/05       7,791,576
    7,882   Volume - Services, Inc......................................        9.31        12/31/06       7,872,395
                                                                                                      --------------
                                                                                                          15,663,971
                                                                                                      --------------
            OTHER METALS/MINERALS (1.2%)
    7,635   CII Carbon, Inc.............................................        8.52        06/25/08       7,625,477
    1,699   U.S. Silica Corp. (Revolver)................................   7.56 to 9.00     06/30/04       1,697,835
   14,966   U.S. Silica Corp............................................        7.93        06/30/06      14,956,589
    5,000   U.S. Silica Corp............................................        8.88        12/31/06       4,999,900
                                                                                                      --------------
                                                                                                          29,279,801
                                                                                                      --------------
            OTHER PHARMACEUTICALS (0.8%)
   19,838   King Pharmaceuticals, Inc...................................        9.24        12/22/06      19,815,543
                                                                                                      --------------
            OTHER SPECIALTY STORES (1.3%)
    4,900   Caribbean Petroleum, LP.....................................        8.81        09/30/05       4,894,855
    5,045   Cumberland Farms, Inc. (Participation Merrill Lynch
              & Co., Inc.) (c)..........................................        9.75        12/31/00       5,045,019
    7,500   Petro Stopping Centers, L.P.................................        8.56        07/23/06       7,492,125
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       22
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
 $ 14,924   The Pantry, Inc.............................................       8.89%        01/31/06  $   14,924,113
                                                                                                      --------------
                                                                                                          32,356,112
                                                                                                      --------------
            PACKAGED FOODS (0.5%)
    9,607   Formax, Inc.................................................  8.19 to 10.00     06/30/05       9,591,799
    2,612   Southern Foods Group, L.P...................................        8.44        03/04/06       2,611,925
                                                                                                      --------------
                                                                                                          12,203,724
                                                                                                      --------------
            PAINTS/COATINGS (0.3%)
    7,500   Metokote Corp...............................................        9.26        11/02/05       7,490,175
                                                                                                      --------------
            PAPER (1.6%)
    7,149   Alabama Pine Pulp Co.,
              Inc. (d)..................................................        9.38        06/30/03       6,791,064
    3,325   Alabama Pine Pulp Co.,
              Inc. (d)..................................................        9.38        06/30/05       1,866,237
    4,429   Alabama Pine Pulp Co.,
              Inc. (d)..................................................       10.75        12/31/08         182,934
    8,524   Alabama River Newsprint Co. (Participation: Toronto Dominion
              Bank) (c).................................................   7.38 to 7.63     12/31/02       8,103,527
    8,872   Bear Island Paper Company, LLC..............................        8.38        12/31/05       8,871,846
    5,655   Crown Paper Co. (Revolver)..................................  8.25 to 10.00     08/22/02       5,655,170
    8,103   Crown Paper Co..............................................  8.81 to 10.50     08/22/03       8,102,432
                                                                                                      --------------
                                                                                                          39,573,210
                                                                                                      --------------
            PRECISION INSTRUMENTS(0.6%)
    4,892   Dynatech Corp...............................................        7.75        03/31/05       4,886,293
    4,892   Dynatech Corp...............................................        8.00        03/31/06       4,886,293
    4,892   Dynatech Corp...............................................        8.25        03/31/07       4,886,293
                                                                                                      --------------
                                                                                                          14,658,879
                                                                                                      --------------
            PRINTING/PUBLISHING (2.3%)
    5,000   American Media Operations, Inc..............................   8.63 to 8.88     04/01/07       4,998,050
   10,656   Cygnus Publishing, Inc......................................        8.24        06/05/05      10,655,504
   17,500   Hollinger International Publishing, Inc.....................       10.25        12/31/04      17,500,000
   10,879   The Sheridan Group, Inc.....................................        8.31        01/30/05      10,878,036
    3,292   Von Hoffman Press, Inc......................................        7.76        05/30/04       3,287,221
   10,690   Von Hoffman Press, Inc......................................        7.76        05/30/05      10,677,671
                                                                                                      --------------
                                                                                                          57,996,482
                                                                                                      --------------
            RECREATIONAL PRODUCTS/TOYS (0.9%)
    7,205   Ritvik Toys, Inc............................................        8.75        02/08/03       7,203,419
    7,205   Ritvik Toys, Inc............................................        9.38        02/08/04       7,203,346
      913   Spalding Holdings Corp......................................        7.79        09/30/03         912,607
    3,494   Spalding Holdings Corp. (Revolver)..........................   7.79 to 9.75     09/30/03       3,493,695
    1,828   Spalding Holdings Corp......................................        8.23        09/30/04       1,827,458
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       23
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
 $  1,828   Spalding Holdings Corp......................................       8.79%        09/30/05  $    1,827,440
    1,052   Spalding Holdings Corp......................................        9.29        03/30/06       1,052,092
                                                                                                      --------------
                                                                                                          23,520,057
                                                                                                      --------------
            RENTAL/LEASING COMPANIES (2.7%)
   12,500   Avis Rent A Car, Inc........................................        8.56        06/30/06      12,496,750
   12,500   Avis Rent A Car, Inc........................................        8.81        06/30/07      12,496,750
   15,000   NationsRent, Inc............................................        8.38        07/20/06      14,999,700
    5,573   Rent-A-Center, Inc..........................................   7.63 to 7.64     01/31/06       5,572,900
    6,816   Rent-A-Center, Inc..........................................   7.88 to 7.89     01/31/07       6,815,912
   14,963   United Rentals, Inc.........................................        7.72        06/30/05      14,961,004
                                                                                                      --------------
                                                                                                          67,343,016
                                                                                                      --------------
            RESTAURANTS (0.3%)
    6,825   Shoney's, Inc...............................................  8.08 to 10.50     04/30/02       6,824,041
                                                                                                      --------------
            RETAIL-SPECIALTY (1.1%)
   12,492   CSK Auto, Inc...............................................        7.38        10/31/03      12,489,876
    8,791   HMV Media Group PLC.........................................        8.26        02/25/06       8,787,684
    6,059   HMV Media Group PLC.........................................        8.58        08/25/06       6,053,044
                                                                                                      --------------
                                                                                                          27,330,604
                                                                                                      --------------
            SEMICONDUCTORS (1.5%)
    9,043   Fairchild Semiconductor Corp................................        8.63        12/15/04       9,043,070
   10,000   Intersil Corp...............................................        9.53        06/30/05       9,988,400
    3,925   Mitel Corp..................................................        7.81        12/26/03       3,920,220
    7,222   Semiconductor Components Industries, LLC....................        9.31        08/04/06       7,214,928
    7,778   Semiconductor Components Industries, LLC....................        9.56        08/04/07       7,769,688
                                                                                                      --------------
                                                                                                          37,936,306
                                                                                                      --------------
            SPECIALTY CHEMICALS (1.9%)
   10,000   Lyondell Petrochemical Co...................................   8.67 to 8.69     06/30/03       9,888,815
   14,925   Lyondell Petrochemical Co...................................        9.36        05/17/06      14,923,060
    6,842   Pioneer America Acqusitions
              Corp......................................................   7.86 to 8.54     12/05/06       6,836,940
    8,100   Pioneer Americas, Inc.......................................   7.88 to 8.66     12/05/06       8,092,032
    8,080   Vining Industries, Inc......................................        8.57        03/31/05       8,071,352
                                                                                                      --------------
                                                                                                          47,812,199
                                                                                                      --------------
            SPECIALTY STEELS (0.8%)
    9,875   ISPAT Inland, L.P...........................................   7.69 to 7.76     07/16/05       9,859,211
    9,875   ISPAT Inland, L.P...........................................   8.19 to 8.26     07/16/06       9,859,211
                                                                                                      --------------
                                                                                                          19,718,422
                                                                                                      --------------
            TELECOMMUNICATION EQUIPMENT (1.6%)
    4,466   Channel Master, Inc.........................................   9.06 to 9.34     10/10/05       4,461,233
   13,000   Pinnacle Towers, Inc........................................        8.52        06/30/07      12,982,840
   22,063   Superior Telecom, Inc.......................................   9.06 to 9.13     11/27/05      21,943,619
                                                                                                      --------------
                                                                                                          39,387,692
                                                                                                      --------------
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       24
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
            TELECOMMUNICATIONS (5.2%)
 $ 10,526   Alaska Communications Systems Holdings, Inc.................       8.50%        11/14/07  $   10,525,579
    9,474   Alaska Communications Systems Holdings, Inc.................        8.75        05/14/08       9,472,926
    7,450   Davel Financing Co., LLC....................................   9.72 to 9.76     06/23/05       7,435,959
   25,000   Global Crossing Holdings,
              Ltd.......................................................        8.26        07/02/07      25,000,000
   15,000   IDT Corp....................................................        8.75        05/10/04      14,971,200
    9,975   Infonet Sevice Corp.........................................        8.26        06/30/06       9,962,033
   25,000   KMC Telecom, Inc............................................        9.31        07/01/07      24,995,250
   10,000   Level 3 Communications, Inc.................................       10.75        01/15/08      10,000,000
    7,528   MJD Communications, Inc.....................................   8.13 to 8.25     03/31/06       7,522,909
    9,850   MJD Communications, Inc.....................................  8.50 to 10.25     03/31/07       9,838,155
                                                                                                      --------------
                                                                                                         129,724,011
                                                                                                      --------------
            TEXTILES (1.0%)
    8,000   Globe Manufacturing, Inc....................................   8.57 to 9.32     07/31/06       7,993,389
    4,532   Joan Fabrics Corp...........................................        8.16        06/30/05       4,532,055
    2,351   Joan Fabrics Corp...........................................        8.66        06/30/06       2,350,715
   10,897   Polymer Group, Inc..........................................   7.88 to 7.94     12/20/05      10,889,226
                                                                                                      --------------
                                                                                                          25,765,385
                                                                                                      --------------
            TRANSPORTATION (1.4%)
    6,310   American Commercial Lines,
              LLC.......................................................        7.56        06/30/06       6,307,547
    8,604   American Commercial Lines,
              LLC.......................................................        7.81        06/30/07       8,600,853
    5,284   MTL, Inc....................................................        7.63        02/28/05       5,284,222
    4,528   MTL, Inc....................................................        7.88        02/28/06       4,529,333
    7,368   North American Van Lines, Inc...............................        8.27        03/31/06       7,360,497
    3,591   Transportacion Ferroviaria Mexicana, S.A. de C.V............        9.72        12/23/02       3,591,036
                                                                                                      --------------
                                                                                                          35,673,488
                                                                                                      --------------
            WIRELESS COMMUNICATIONS (4.9%)
   13,684   Arch Paging, Inc............................................       12.19        06/30/06      13,682,707
   10,000   Nextel Communications, Inc..................................        9.06        03/31/07       9,874,400
   20,000   Nextel Finance Co...........................................        8.31        09/30/06      19,977,600
   15,000   Nextel Partners Operating
              Corp......................................................       10.19        01/29/08      14,836,350
   10,000   Nextel Partners Operating
              Corp......................................................        9.77        07/29/08       9,988,200
   19,938   Omnipoint Communications,
              Inc.......................................................   8.69 to 8.72     02/17/06      19,871,863
   11,000   Powertel PCS, Inc...........................................        8.56        12/31/08      10,988,560
   14,000   Powertel PCS, Inc. (Participation: Goldman Sachs & Co.)
              (c).......................................................   8.38 to 8.56     12/31/08      13,985,300
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       25
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE        VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>       <C>
 $ 10,000   Teligent, Inc...............................................       8.45%        06/30/06  $    9,992,100
                                                                                                      --------------
                                                                                                         123,197,080
                                                                                                      --------------

            TOTAL SENIOR COLLATERALIZED TERM LOANS
            (IDENTIFIED COST $2,397,386,167)........................................................   2,388,163,607
                                                                                                      --------------

            SENIOR NOTES (0.4%)
    1,613   London Fog Industries, Inc. (e).............................       10.00        02/27/03         629,121
    9,563   Supercanal Holdings S.A. (Argentina)........................        9.81        10/12/02       9,561,459
                                                                                                      --------------

            TOTAL SENIOR NOTES
            (IDENTIFIED COST $11,452,484)...........................................................      10,190,580
                                                                                                      --------------
</TABLE>

<TABLE>
<CAPTION>
NUMBER OF
  SHARES
- ----------
<C>         <S>                                                           <C>               <C>        <C>
            COMMON STOCK (a) (f) (0.0%)
            APPAREL
 129,050    London Fog Industries, Inc. (Restricted)
              (IDENTIFIED COST $2,258,908)..............................                                     --
                                                                                                       --------------
</TABLE>

<TABLE>
<CAPTION>
NUMBER OF                                                                                    EXPIRATION
 WARRANTS                                                                                       DATE
- ----------                                                                                   ----------
<C>         <S>                                                                              <C>         <C>
            WARRANT (a) (f) (0.0%)
   7,931    London Fog Industries, Inc. (Restricted)
              (IDENTIFIED COST $1,722,237).................................................   02/27/05         --
                                                                                                         --------------
</TABLE>

<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE
- ----------                                                                ----------------  --------
<C>         <S>                                                           <C>               <C>        <C>
            SHORT-TERM INVESTMENTS (4.0%)
            COMMERCIAL PAPER (g) (3.6%)
            FINANCE - CONSUMER
 $22,000    American Express Credit Corp................................        5.44        10/01/99       22,000,000
  27,000    American Express Credit Corp. (h)...........................        5.40        10/04/99       26,987,850
  40,000    American Express Credit Corp. (h)...........................        5.28        10/08/99       39,958,933
                                                                                                       --------------

            TOTAL COMMERCIAL PAPER
            (AMORTIZED COST $88,946,783)............................................................       88,946,783
                                                                                                       --------------
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       26
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1999, CONTINUED

<TABLE>
PRINCIPAL
AMOUNT IN                                                                      COUPON       MATURITY
THOUSANDS                                                                       RATE          DATE         VALUE
- ---------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>               <C>        <C>
            REPURCHASE AGREEMENT (0.4%)
 $11,004    The Bank of New York (dated 09/30/99; proceeds $11,005,055)
              (i)
              (IDENTIFIED COST $11,003,527).............................       5.00%        10/01/99   $   11,003,527
                                                                                                       --------------

            TOTAL SHORT-TERM INVESTMENTS
            (IDENTIFIED COST $99,950,310)...........................................................       99,950,310
                                                                                                       --------------
</TABLE>

<TABLE>
            <S>                                                                                <C>       <C>
            TOTAL INVESTMENTS
            (IDENTIFIED COST $2,512,770,106) (J).............................................     99.4%    2,498,304,497

            CASH AND OTHER ASSETS IN EXCESS OF LIABILITIES...................................      0.6        15,654,526
                                                                                               -------   ---------------

            NET ASSETS.......................................................................    100.0%  $ 2,513,959,023
                                                                                               -------   ---------------
                                                                                               -------   ---------------
</TABLE>

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

(a)  Valued using fair value procedures - total aggregate value is
     $2,398,354,187.
(b)  Floating rate securities. Interest rates shown are those in effect at
     September 30, 1999.
(c)  Participation interests were acquired through the financial institutions
     indicated parenthetically.
(d)  Payment in kind security.
(e)  Non-income producing security; note 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 or a portion of these securities are segregated in connection with
     unfunded loan commitments.
(i)  Collateralized by $11,247,330 U.S. Treasury Note 5.375% due 06/30/03 valued
     at $11,227,999.
(j)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $2,632,462 and the
     aggregate gross unrealized depreciation is $17,098,071, resulting in net
     unrealized depreciation of $14,465,609.

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       27
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
FINANCIAL STATEMENTS

STATEMENT OF ASSETS AND LIABILITIES
SEPTEMBER 30, 1999

<TABLE>
<S>                                                             <C>
ASSETS:
Investments in securities, at value
  (identified cost $2,512,770,106)..........................    $2,498,304,497
Cash........................................................         3,735,088
Receivable for:
    Interest................................................        17,078,683
    Shares of beneficial interest sold......................         5,126,064
    Investments sold........................................           435,434
Prepaid expenses and other assets...........................         1,011,737
                                                                --------------

     TOTAL ASSETS...........................................     2,525,691,503
                                                                --------------

LIABILITIES:
Payable for:
    Investment advisory fee.................................         1,757,262
    Dividends to shareholders...............................         1,220,374
    Administration fee......................................           517,047
Accrued expenses and other payables.........................           304,585
Deferred loan fees..........................................         7,933,212
Commitments and contingencies (Note 7)......................          --
                                                                --------------

     TOTAL LIABILITIES......................................        11,732,480
                                                                --------------

     NET ASSETS.............................................    $2,513,959,023
                                                                ==============

COMPOSITION OF NET ASSETS:
Paid-in-capital.............................................    $2,536,180,951
Net unrealized depreciation.................................       (14,465,609)
Accumulated undistributed net investment income.............           704,520
Accumulated net realized loss...............................        (8,460,839)
                                                                --------------

     NET ASSETS.............................................    $2,513,959,023
                                                                ==============

NET ASSET VALUE PER SHARE,
  254,813,996 SHARES OUTSTANDING
  (UNLIMITED SHARES AUTHORIZED OF $.01 PAR VALUE)...........             $9.87
                                                                ==============
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       28
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
FINANCIAL STATEMENTS, CONTINUED

STATEMENT OF OPERATIONS
FOR THE YEAR ENDED SEPTEMBER 30, 1999

<TABLE>
<S>                                                             <C>
NET INVESTMENT INCOME:

INCOME
Interest....................................................    $183,155,103
Facility, amendment and other loan fees.....................       5,258,883
Other income................................................         823,457
                                                                ------------

     TOTAL INCOME...........................................     189,237,443
                                                                ------------

EXPENSES
Investment advisory fee.....................................      19,568,322
Administration fee..........................................       5,740,526
Transfer agent fees and expenses............................       1,008,446
Professional fees...........................................         616,632
Registration fees...........................................         407,360
Shareholder reports and notices.............................         353,753
Facility fees...............................................         144,412
Custodian fees..............................................         115,375
Trustees' fees and expenses.................................          16,145
Other.......................................................         151,925
                                                                ------------

     TOTAL EXPENSES.........................................      28,122,896

Less: expense offset........................................         (33,238)
                                                                ------------

     NET EXPENSES...........................................      28,089,658
                                                                ------------

     NET INVESTMENT INCOME..................................     161,147,785
                                                                ------------

NET REALIZED AND UNREALIZED GAIN (LOSS):
Net realized gain...........................................       1,067,708
Net change in unrealized depreciation.......................     (13,449,451)
                                                                ------------

     NET LOSS...............................................     (12,381,743)
                                                                ------------

NET INCREASE................................................    $148,766,042
                                                                ============
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       29
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
FINANCIAL STATEMENTS, CONTINUED

STATEMENT OF CHANGES IN NET ASSETS

<TABLE>
                                                   FOR THE YEAR     FOR THE YEAR
                                                      ENDED            ENDED
                                                  SEPTEMBER 30,    SEPTEMBER 30,
                                                       1999             1998
- ---------------------------------------------------------------------------------
<S>                                               <C>              <C>

INCREASE (DECREASE) IN NET ASSETS:

OPERATIONS:
Net investment income.........................    $ 161,147,785    $  119,953,468
Net realized gain (loss)......................        1,067,708       (10,227,863)
Net change in unrealized depreciation.........      (13,449,451)        2,829,220
                                                  --------------   --------------

     NET INCREASE.............................      148,766,042       112,554,825

Dividends from net investment income..........     (159,065,743)     (120,722,134)

Net increase from transactions in shares of
  beneficial interest.........................      527,549,296       660,273,515
                                                  --------------   --------------

     NET INCREASE.............................      517,249,595       652,106,206

NET ASSETS:
Beginning of period...........................    1,996,709,428     1,344,603,222
                                                  --------------   --------------

     END OF PERIOD
    (INCLUDING UNDISTRIBUTED NET INVESTMENT
    INCOME OF $704,520 AND DIVIDENDS IN EXCESS
    OF NET INVESTMENT INCOME OF $552,409,
    RESPECTIVELY).............................    $2,513,959,023   $1,996,709,428
                                                  ==============   ==============
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       30
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
FINANCIAL STATEMENTS, CONTINUED

STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED SEPTEMBER 30, 1999

<TABLE>
<S>                                                             <C>
INCREASE (DECREASE) IN CASH:

CASH FLOWS PROVIDED BY OPERATING ACTIVITIES:
Net investment income.......................................    $   161,147,785
Adjustments to reconcile net investment income to net cash
  provided by operating activities:
Increase in receivables and other assets related to
  operations................................................         (4,819,335)
Increase in payables related to operations..................            239,476
Net loan fees received......................................          8,407,380
Amortization of loan fees...................................         (5,258,883)
Accretion of discounts......................................           (399,778)
                                                                ---------------

     NET CASH PROVIDED BY OPERATING ACTIVITIES..............        159,316,645
                                                                ---------------

CASH FLOWS USED FOR INVESTING ACTIVITIES:
Purchases of investments....................................     (1,547,470,530)
Principal repayments/sales of investments...................        904,621,846
Net sales/maturities of short-term investments..............        113,054,438
                                                                ---------------

     NET CASH USED FOR INVESTING ACTIVITIES.................       (529,794,246)
                                                                ---------------

CASH FLOWS PROVIDED BY FINANCING ACTIVITIES:
Shares of beneficial interest sold..........................        649,548,611
Shares tendered.............................................       (188,124,450)
Dividends from net investment income (net of reinvested
  dividends of $69,946,361).................................        (88,658,423)
                                                                ---------------

     NET CASH PROVIDED BY FINANCING ACTIVITIES..............        372,765,738
                                                                ---------------

NET INCREASE IN CASH........................................          2,288,137

CASH BALANCE AT BEGINNING OF YEAR...........................          1,446,951
                                                                ---------------

CASH BALANCE AT END OF YEAR.................................    $     3,735,088
                                                                ===============
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       31
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1999

1. ORGANIZATION AND ACCOUNTING POLICIES

Morgan Stanley Dean Witter Prime Income Trust (the "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

                                       32
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1999, 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 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

                                       33
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1999, CONTINUED

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"), 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; 0.85% to the
portion of the daily net assets exceeding $500 million but not exceeding $1.5
billion; and 0.825% to the portion of daily net assets exceeding $1.5 billion.
Effective May 1, 1999 the Agreement was amended to reduce the annual rate to
0.80% of the portion of daily net assets in excess of $2.5 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.

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,
1999 aggregated $1,547,470,530 and $905,057,280, respectively.

                                       34
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1999, CONTINUED

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, 1999, the Investment Advisor has informed the Trust that it
received approximately $2,651,000 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, 1999, the Trust
had transfer agent fees and expenses payable of approximately $8,300.

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, 1999
included in Trustees' fees and expenses in the Statement of Operations amounted
to $5,742. At September 30, 1999, the Trust had an accrued pension liability of
$52,116 which is included in accrued expenses in the Statement of Assets and
Liabilities.

5. FEDERAL INCOME TAX STATUS

At September 30, 1999, the Trust had a net capital loss carryover of
approximately $7,723,000 of which $62,000 will be available through
September 30, 2004 and $7,661,000 will be available through September 30, 2007
to offset future capital gains to the extent provided by regulations.

As of September 30, 1999, the Trust had temporary book/tax differences primarily
attributable to dividends payable and tax adjustments on revolver loans held by
the Trust and permanent book/tax differences attributable to revolver loans sold
by the Trust. To reflect reclassifications arising from the permanent
differences, accumulated undistributed net investment income was charged
$825,113 and accumulated net realized loss was credited $825,113.

                                       35
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1999, CONTINUED

6. SHARES OF BENEFICIAL INTEREST

Transactions in shares of beneficial interest were as follows:

<TABLE>
<CAPTION>
                                                                SHARES          AMOUNT
                                                              -----------   --------------
<S>                                                           <C>           <C>
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
Shares sold.................................................   65,236,515      645,727,385
Shares issued to shareholders for reinvestment of
 dividends..................................................    7,070,460       69,946,361
Shares tendered (four quarterly tender offers)..............  (19,019,056)    (188,124,450)
                                                              -----------   --------------
Balance, September 30, 1999.................................  254,813,996   $2,536,180,953
                                                              ===========   ==============
</TABLE>

On October 20, 1999, the Trustees approved a tender offer to purchase up to 12
million shares of beneficial interest to commence on November 17, 1999.

7. COMMITMENTS AND CONTINGENCIES

As of September 30, 1999, the Trust had unfunded loan commitments pursuant to
the following loan agreements:

<TABLE>
<CAPTION>
                                                               UNFUNDED
BORROWER                                                      COMMITMENT
- --------                                                      -----------
<S>                                                           <C>
Arena Brands, Inc...........................................  $ 1,045,000
Bridge Information Systems, Inc.............................      222,222
Chancellor Media Corp.......................................    4,261,250
Corning Consumer Products Co................................      676,364
Crown Paper Co..............................................    2,056,500
Jet Plastica Industries, Inc................................    2,702,703
Mafco Finance Corp..........................................    3,246,923
Spalding Holdings Corp......................................    2,388,235
Spectrasite Communications, Inc. (Revolver).................      714,286
Spectrasite Communications, Inc. (Term Loan)................    4,285,714
Teligent, Inc. (Multi-Draw).................................    6,666,667
Teligent, Inc. (Revolver)...................................    3,333,333
Tenneco Automotive..........................................   10,000,000
U.S. Silica Co. (Working Capital)...........................    1,302,000
                                                              -----------
                                                              $42,901,197
                                                              ===========
</TABLE>

The total value of securities segregated for unfunded loan commitments was
$49,954,433.

                                       36
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
FINANCIAL HIGHLIGHTS

Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:
<TABLE>
<CAPTION>

                                                                FOR THE YEAR ENDED SEPTEMBER 30,
                             ------------------------------------------------------------------------------------------------------
                                1999         1998         1997        1996       1995       1994       1993       1992       1991
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                          <C>          <C>          <C>          <C>        <C>        <C>        <C>        <C>        <C>
SELECTED PER SHARE DATA:

Net asset value, beginning
 of period.................  $     9.91   $     9.95   $     9.94   $   9.99     $10.00   $   9.91   $   9.99   $  10.00   $  10.00
                             ----------   ----------   ----------   --------     ------   --------   --------   --------   --------

Income (loss) from
 investment operations:
   Net investment income...        0.70         0.71         0.75       0.74       0.82       0.62       0.55       0.62       0.84
   Net realized and
   unrealized gain
   (loss)..................       (0.05)       (0.03)      --          (0.04)      0.01       0.09      (0.08)     (0.01)     --
                             ----------   ----------   ----------   --------     ------   --------   --------   --------   --------

Total income from
 investment operations.....        0.65         0.68         0.75       0.70       0.83       0.71       0.47       0.61       0.84
                             ----------   ----------   ----------   --------     ------   --------   --------   --------   --------

Less dividends and
 distributions from:
   Net investment income...       (0.69)       (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.............       (0.69)       (0.72)       (0.74)     (0.75)     (0.84)     (0.62)     (0.55)     (0.62)     (0.84)
                             ----------   ----------   ----------   --------     ------   --------   --------   --------   --------

Net asset value, end of
 period....................  $     9.87   $     9.91   $     9.95   $   9.94     $ 9.99   $  10.00   $   9.91   $   9.99   $  10.00
                             ==========   ==========   ==========   ========     ======   ========   ========   ========   ========

TOTAL RETURN+..............        6.72%        7.14%        7.78%      7.25%      8.57%      7.32%      4.85%      6.23%      8.77%

RATIOS TO AVERAGE NET
ASSETS:
Expenses...................        1.22%        1.29%        1.40%      1.46%      1.52%      1.60%      1.45%      1.47%      1.52%

Net investment income......        7.02%        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..............  $2,513,959   $1,996,709   $1,344,603   $939,471   $521,361   $305,034   $311,479   $413,497   $479,941

Portfolio turnover rate....          44%          68%          86%        72%       102%       147%        92%        46%        42%

<CAPTION>
                               FOR THE PERIOD
                             NOVEMBER 30, 1989*
                                   THROUGH
                             SEPTEMBER 30, 1990
- ---------------------------  -------------------
<S>                          <C>
SELECTED PER SHARE DATA:
Net asset value, beginning
 of period.................       $  10.00
                                  --------
Income (loss) from
 investment operations:
   Net investment income...           0.74
   Net realized and
   unrealized gain
   (loss)..................          (0.01)
                                  --------
Total income 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 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>

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

<TABLE>
<C>    <S>
  *    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.
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                       37
<PAGE>

<TABLE>
<S>                                              <C>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
REPORT OF INDEPENDENT ACCOUNTANTS
</TABLE>

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") at September 30, 1999, 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 nine 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, 1999 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 15, 1999

                                       38
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998

<TABLE>
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
                                       39
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED

<TABLE>
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
                                       40
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED

<TABLE>
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
                                       41
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED

<TABLE>
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
                                       42
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED

<TABLE>
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
                                       43
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED

<TABLE>
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
                                       44
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED

<TABLE>
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
                                       45
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED

<TABLE>
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
                                       46
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED

<TABLE>
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
                                       47
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED

<TABLE>
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
                                       48
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED

<TABLE>
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>
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>
NUMBER OF
WARRANTS
- --------
<C>
   7,931

<C>        <S>                                                                      <C>            <C>         <C>

NUMBER OF                                                                                          EXPIRATION
WARRANTS                                                                                             DATE
- --------                                                                                            --------
           WARRANT (a)(f) (0.0%)
           APPAREL
   7,931   London Fog Industries, Inc.
             (IDENTIFIED COST $1,722,237)........................................................   02/27/05           96,000
                                                                                                               --------------
</TABLE>

<TABLE>
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
                                       49
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1998, CONTINUED

<TABLE>
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
                                       50
<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
                                       51
<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
                                       52
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
FINANCIAL STATEMENTS, CONTINUED

STATEMENT OF CHANGES IN NET ASSETS

<TABLE>
                                                   FOR THE YEAR     FOR THE YEAR
                                                      ENDED            ENDED
                                                  SEPTEMBER 30,    SEPTEMBER 30,
                                                       1998             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
                                       53
<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
                                       54
<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

                                       55
<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 federal tax-basis treatment;
temporary differences do not require reclassification. Dividends and

                                       56
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1998, CONTINUED

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.

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.

                                       57
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1998, CONTINUED

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)
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

                                       58
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1998, CONTINUED

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.

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.

                                       59
<PAGE>
MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
FINANCIAL HIGHLIGHTS

Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:
<TABLE>
<CAPTION>

                                                             FOR THE YEAR ENDED 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 PERFORMANC
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>

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

<TABLE>
<C>    <S>
  *    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.
</TABLE>

                          SEE NOTES TO FINANCIAL STATEMENTS

                                       60
<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

                                       61

<PAGE>
                                                              EXHIBIT (a)(1)(ii)

                    FORM OF LETTER TO SHAREHOLDERS WHO HAVE
                          REQUESTED OFFER TO PURCHASE
<PAGE>
                 MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST

Dear Shareholder:

    As you requested, we are enclosing a copy of the Morgan Stanley Dean Witter
Prime Income Trust (the "Trust") Offer to Purchase 12,000,000 of its issued and
outstanding common shares of beneficial interest (the "Common Shares") and the
related Letter of Transmittal (which together constitute the "Offer"). The Offer
is for cash at the net asset value ("NAV") per Common Share computed as of
4:00 P.M. New York City time on the expiration date of the Offer. The expiration
date is 12:00, midnight, New York City time on March 17, 2000, unless extended
as stated in the Offer. An "Early Withdrawal Charge" will be imposed on most
Common Shares accepted for payment that have been held for four years or less.
Please read carefully the enclosed documents, which include the Trust's most
recent financial statements.

    If after reviewing the information set forth in the Offer, you wish to
tender Common Shares for purchase by the Trust, and you have a brokerage account
at Dean Witter Reynolds Inc. and your Common Shares are not evidenced by
certificates in your possession you may, if you wish, contact your Morgan
Stanley Dean Witter Financial Advisor and request that he or she tender your
Common Shares on your behalf. In such event you are not required to complete the
enclosed Letter of Transmittal.

    If you do not have a brokerage account at Dean Witter Reynolds Inc. and wish
to tender Common Shares or do not wish to tender Common Shares through your
Morgan Stanley Dean Witter Financial Advisor at Dean Witter Reynolds Inc. or
your Common Shares are evidenced by certificates in your possession, please
follow the instructions contained in the Offer to Purchase and Letter of
Transmittal.

    Neither the Trust nor the Board of Trustees is making any recommendations to
any holder of Common Shares as to whether to tender Common Shares. Each
shareholder is urged to consult his or her Financial Advisor or tax professional
before deciding whether to tender any Common Shares.

    The Trust's NAV per Share on February 4, 2000 was $   . You can obtain
current NAV quotations from Dean Witter Reynolds Inc. by calling (800) 869-NEWS
extension 0. The Trust offers and sells its Common Shares to the public on a
continuous basis. The Trust is not aware of any secondary market trading for the
Common Shares.

    Should you have any questions on the enclosed material, please do not
hesitate to call Dean Witter Reynolds Inc. at (800) 869-NEWS extension 0 during
ordinary business hours. We appreciate your continued interest in Morgan Stanley
Dean Witter Prime Income Trust.

                             Sincerely,

                             MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST

<TABLE>
<S>                                                          <C>
                                                             Two World Trade
                                                             Center
                                                             New York, NY 10048
                                                             Telephone (212)
                                                             392-1600
</TABLE>

<PAGE>
                                                             EXHIBIT (a)(1)(iii)

                         FORM OF LETTER OF TRANSMITTAL
<PAGE>
                             LETTER OF TRANSMITTAL
                            REGARDING COMMON SHARES
                                       OF
                 MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST

                   TENDERED PURSUANT TO THE OFFER TO PURCHASE
                            DATED FEBRUARY 16, 2000

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

     THE OFFER AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT NEW YORK CITY
          TIME ON FRIDAY, MARCH 17, 2000, UNLESS THE OFFER IS EXTENDED

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

                               TO THE DEPOSITARY:

                      MORGAN STANLEY DEAN WITTER TRUST FSB

<TABLE>
<S>                            <C>
          BY MAIL:               BY HAND DELIVERY OR COURIER:

 Morgan Stanley Dean Witter       Morgan Stanley Dean Witter
          Trust FSB                       Trust FSB
        P.O. Box 984             Harborside Financial Center
Jersey City, New Jersey 07303             Plaza Two
                                Jersey City, New Jersey 07311
                               Attn: Morgan Stanley Dean Witter
                                      Prime Income Trust
</TABLE>

                         FOR DELIVERY INFORMATION CALL:
                           (800) 869-NEWS extension 0

<TABLE>
<S>                                         <C>                             <C>                          <C>
- -------------------------------------------------------------------------------------------------------------------------------
                               DESCRIPTION OF COMMON SHARES TENDERED (SEE INSTRUCTIONS 3 AND 4)
- -------------------------------------------------------------------------------------------------------------------------------
  NAME(S) AND ADDRESS(ES) OF REGISTERED
  OWNER(S) (PLEASE FILL IN EXACTLY THE
  NAME(S) IN WHICH COMMON SHARES ARE                                      COMMON SHARES TENDERED
  REGISTERED)                                                    (ATTACH ADDITIONAL SCHEDULE IF NECESSARY)
- -------------------------------------------------------------------------------------------------------------------------------
                                                                                                             NO. OF COMMON
                                                  CERTIFICATE NO.(S)*          NO. OF COMMON SHARES*       SHARES TENDERED**

                                            ------------------------------- ---------------------------- ----------------------
                                            ------------------------------- ---------------------------- ----------------------
                                            ------------------------------- ---------------------------- ----------------------
                                            ------------------------------- ---------------------------- ----------------------
                                            Total Common Shares
                Account No.                 Tendered
- -------------------------------------------------------------------------------------------------------------------------------
  * If Common Shares are not evidenced by certificates please write "None."
 ** To be completed by all tendering shareholders, whether or not your Common Shares are evidenced by certificates. If you
    desire to tender fewer than all Common Shares held in your account or evidenced by a certificate listed above, please
    indicate in this column the number you wish to tender. Otherwise all Common Shares evidenced by such certificate or held in
    your account will be deemed to have been tendered.
- -------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                   IMPORTANT

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

     YOU SHOULD NOT COMPLETE THE LETTER OF TRANSMITTAL IF YOU ARE TENDERING
    COMMON SHARES THROUGH YOUR MORGAN STANLEY DEAN WITTER FINANCIAL ADVISOR.

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

    DELIVERY TO AN ADDRESS OTHER THAN THAT SHOWN ABOVE DOES NOT CONSTITUTE VALID
DELIVERY.

              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY

Gentlemen:
    The undersigned hereby tenders to the Morgan Stanley Dean Witter Prime
Income Trust, a non-diversified, closed-end management investment company
organized as a Massachusetts business trust (the "Trust") under the former name
"Allstate Prime Income Trust," the above-described common shares of beneficial
interest, par value $.01 per share, of the Trust (the "Common Shares"), at a
price (the "Purchase Price") equal to the net asset value per Common Share
("NAV") computed as of 4:00 P.M. New York City time on the Expiration Date (as
defined in the Offer to Purchase) in cash, upon the terms and conditions set
forth in the Offer to Purchase, dated February 16, 2000, receipt of which is
hereby acknowledged, and in this Letter of Transmittal (which together
constitute the "Offer"). An Early Withdrawal Charge (as defined in the Offer to
Purchase) will be imposed on most Common Shares accepted for payment which have
been held for four years or less.

    Subject to and effective upon acceptance for payment of the Common Shares
tendered hereby in accordance with the terms of the Offer (including, if the
Offer is extended or amended, the terms or conditions of any such extension or
<PAGE>
amendment), the undersigned hereby sells, assigns and transfers to or upon the
order of the Trust all right, title and interest in and to all Common Shares
tendered hereby that are purchased pursuant to the Offer and hereby irrevocably
constitutes and appoints Morgan Stanley Dean Witter Trust FSB (the "Depositary")
as attorney-in-fact of the undersigned with respect to such Common Shares, with
full power of substitution (such power of attorney being deemed to be an
irrevocable power coupled with an interest), to (a) deliver certificates for
such Common Shares or transfer ownership of such Common Shares on the Trust's
books, together in either such case with all accompanying evidences of transfer
and authenticity, to or upon the order of the Trust, upon receipt by the
Depositary, as the undersigned's agent, of the NAV per Common Share with respect
to such Common Shares; (b) present certificates for such Common Shares, if any,
for cancellation and transfer on the Trust's books; (c) deduct from the Purchase
Price deposited with the Depositary the applicable Early Withdrawal Charge and
remit such charge to Morgan Stanley Dean Witter Advisors Inc., and (d) receive
all benefits and otherwise exercise all rights of beneficial ownership of such
Common Shares, subject to the next paragraph, all in accordance with the terms
of the Offer.

    The undersigned hereby represents and warrants that: (a) the undersigned
"owns" the Common Shares tendered hereby within the meaning of Rule 10b-4
promulgated under the Securities Exchange Act of 1934, as amended, and has full
power and authority to validly tender, sell, assign and transfer the Common
Shares tendered hereby; (b) when and to the extent the Trust accepts the Common
Shares for purchase, the Trust will acquire good, marketable and unencumbered
title to them, free and clear of all security interests, liens, charges,
encumbrances, conditional sales agreements or other obligations relating to
their sale or transfer, and not subject to any adverse claim; (c) on request,
the undersigned will execute and deliver any additional documents the Depositary
or the Trust deems necessary or desirable to complete the assignment, transfer
and purchase of the Common Shares tendered hereby; and (d) the undersigned has
read and agrees to all of the terms of the Offer.

    The names and addresses of the registered owners should be printed, if they
are not already printed above, as they appear on the registration of the Common
Shares. The certificate numbers, if any, and the number of Common Shares that
the undersigned wishes to tender should be indicated in the appropriate boxes.

    The undersigned recognizes that under certain circumstances set forth in the
Offer to Purchase, the Trust may terminate or amend the Offer or may not be
required to purchase any of the Common Shares tendered hereby. In any such
event, the undersigned understands that certificate(s) for any Common Shares not
purchased, if any, will be returned to the undersigned at the address indicated
above unless otherwise indicated under the Special Payment Instructions or
Special Delivery Instructions below. The undersigned recognizes that the Trust
has no obligation, pursuant to the Special Payment Instructions, to transfer any
Common Shares from the name of the registered owner thereof if the Trust
purchases none of such Common Shares.

    The undersigned understands that acceptance of Common Shares by the Trust
for payment will constitute a binding agreement between the undersigned and the
Trust upon the terms and subject to the conditions of the Offer.

    The check for the Purchase Price of the tendered Common Shares purchased,
minus any applicable Early Withdrawal Charge, will be issued to the order of the
undersigned and mailed to the address indicated above unless otherwise indicated
under the Special Payment Instructions or the Special Delivery Instructions
below. Shareholders tendering Common Shares shall be entitled to receive all
dividends declared on or before the Expiration Date, but not yet paid, on Common
Shares tendered pursuant to the Offer. The Trust will not pay interest on the
Purchase Price under any circumstances.

    All authority herein conferred or agreed to be conferred shall survive the
death or incapacity of the undersigned and all obligations of the undersigned
hereunder shall be binding upon the heirs, personal representatives, successors
and assigns of the undersigned. Except as stated in the Offer, this tender is
irrevocable.

<TABLE>
<S>                                                         <C>
- ------------------------------------------------            ------------------------------------------------
          SPECIAL PAYMENT INSTRUCTIONS                               SPECIAL DELIVERY INSTRUCTIONS
        (See Instructions 4, 5, 6 and 7)                               (See Instructions 4 and 7)
To be completed ONLY if certificates for Common             To be completed ONLY if certificates for Common
Shares not tendered or not purchased and/or any             Shares not tendered or not purchased and/or any
checks are to be issued in the name of or sent              checks issued in the name of the undersigned are
to someone other than the undersigned.                      to be sent to someone other than the undersigned
                                                            or to the undersigned at an address other than
                                                            that shown above.

Issue:    / / check                                         Mail:    / / check
          / / certificates to:                                       / / certificates to:

Name(s)                                                     Name(s)
- ---------------------------------------------               ---------------------------------------------
                 (Please Print)                                              (Please Print)

Address                                                     Address
- ------------------------------------------                  ------------------------------------------

- ------------------------------------------------            ------------------------------------------------
               (Include Zip Code)                                          (Include Zip Code)

- ------------------------------------------------            ------------------------------------------------
          (Taxpayer Identification or                                    (Tax Identification or
           Social Security Number(s))                                  Social Security Number(s))
</TABLE>

<PAGE>

<TABLE>
  <S>  <C>                                                           <C>
  ----------------------------------------------------------------------
                             SHAREHOLDER(S) SIGN
  HERE
                               (See Instructions 1 and
  5)
                    (Please see Substitute Form W-9 on Reverse
  Side)

  Must be signed by registered owner(s) exactly as registered or by
  person(s) authorized to become registered owner(s) by documents
  transmitted with the Letter of Transmittal. If signature is by
  attorney-in-fact, executor, administrator, trustee, guardian, officer
  of a corporation or another acting in a fiduciary or representative
  capacity, please set forth the full title. See Instruction 5.
       ------------------------------------------------------------

       ------------------------------------------------------------
             (SIGNATURE(S) OF OWNER(S) EXACTLY AS REGISTERED)

       Dated _______________________________________________________ , 19____

       Name(s)_______________________________________________________________

       ------------------------------------------------------------
                              (PLEASE PRINT)

       ------------------------------------------------------------
            (TAX IDENTIFICATION OR SOCIAL SECURITY NUMBER(S))

       Area Code and Daytime Telephone Number (   )
       _________________________

                        GUARANTEE OF SIGNATURE(S)
                        (See Instructions 1 and 5)

                                               Authorized Signature
                      ---------------------------------------------

                                                               Name
       ------------------------------------------------------------
                              (PLEASE PRINT)

       Title
       ------------------------------------------------------------

       Name of Firm
       ----------------------------------------------------

       Address
       ----------------------------------------------------------

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

       ------------------------------------------------------------
                            (INCLUDE ZIP CODE)

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

       Area Code and Telephone
       Number _______________________________________

       Dated ______________________________________________________ , 19_____
</TABLE>
<PAGE>
                                  INSTRUCTIONS

             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER

    1.  GUARANTEE OF SIGNATURES.  If the Letter of Transmittal is signed by the
registered owner of the Common Shares, the payment of the Purchase Price is to
be sent to the registered owner of the Common Shares and to the address shown in
the Common Share registration, unless such owner has completed the box entitled
either "Special Payment Instructions" or "Special Delivery Instructions" above,
no signature guarantee is required. In all other cases, all signatures on this
Letter of Transmittal must be guaranteed by an eligible guarantor acceptable to
the Depositary (an "Eligible Guarantor") (shareholders should contact the
Depositary for a determination as to whether a particular institution is an
Eligible Guarantor).

    2.  DELIVERY OF LETTER OF TRANSMITTAL AND CERTIFICATES.  This Letter of
Transmittal is to be used only if you do not have a brokerage account at DWR or
you desire to effect the tender offer transaction yourself. A properly completed
and duly executed Letter of Transmittal or manually signed facsimile of it, any
certificates representing Common Shares tendered and any other documents
required by this Letter of Transmittal should be mailed or delivered to the
Depositary at the appropriate address set forth herein and must be received by
the Depositary on or prior to the Expiration Date (as defined in the Offer to
Purchase).

    THE METHOD OF DELIVERY OF ALL DOCUMENTS, INCLUDING CERTIFICATES FOR COMMON
SHARES, IS AT THE ELECTION AND RISK OF THE TENDERING SHAREHOLDER. IF DELIVERY IS
BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY INSURED, IS
RECOMMENDED.

    The Trust will not accept any alternative, conditional or contingent
tenders. All tendering shareholders, by execution of this Letter of Transmittal
(or a manually signed facsimile of it), waive any right to receive any notice of
the acceptance of their tender.

    3.  INADEQUATE SPACE.  If the space provided in the box captioned
"Description of Common Shares Tendered" is inadequate, the certificate numbers,
if any, and number of Common Shares should be listed on a separate signed
schedule attached hereto.

    4.  PARTIAL TENDERS AND UNPURCHASED SHARES.  If fewer than all of the Common
Shares evidenced by any certificate submitted are to be tendered, fill in the
number of Common Shares which are to be tendered in the column entitled "No. of
Common Shares Tendered." In such case, if any tendered Common Shares are
purchased, a new certificate for the remainder of the Common Shares evidenced by
your old certificate(s) will be issued and sent to the registered owner, unless
otherwise specified in the "Special Payment Instructions" or "Special Delivery
Instructions" boxes on this Letter of Transmittal, as soon as practicable after
the Expiration Date of the Offer. All Common Shares represented by certificates
listed and delivered to the Depositary are deemed to have been tendered unless
otherwise indicated.

    5.  SIGNATURES ON LETTER OF TRANSMITTAL, AUTHORIZATIONS AND ENDORSEMENTS.

    (a) If this Letter of Transmittal is signed by the registered owner(s) of
the Common Shares tendered hereby, the signature(s) must correspond exactly with
the name(s) in which the Common Shares are registered.

    (b) If the Common Shares are held of record by two or more joint owners,
each such owner must sign this Letter of Transmittal.

    (c) If any tendered Common Shares are registered in different names, it will
be necessary to complete, sign and submit as many separate Letters of
Transmittal (or manually signed facsimiles of it) as there are different
registrations of Common Shares.

    (d) When this Letter of Transmittal is signed by the registered owner(s) of
the Common Shares listed and transmitted hereby, no endorsements of any
certificate(s) representing such Common Shares or separate authorizations are
required. If, however, payment is to be made to a person other than the
registered owner(s) or any certificates for unpurchased Common Shares are to be
issued to a person other than the registered owner(s), then the Letter of
Transmittal and, if applicable, the certificate(s) transmitted hereby, must be
endorsed or accompanied by appropriate authorizations, in either case signed
exactly as such name(s) appear on the registration of the Common Shares and on
the face of the certificate(s) and such endorsements or authorizations must be
guaranteed by an Eligible Guarantor. See Instruction 1.

    (e) If this Letter of Transmittal or any certificates or authorizations are
signed by trustees, executors, administrators, guardians, attorneys-in-fact,
officers of corporations or others acting in a fiduciary or representative
capacity, such persons should so indicate when signing and must submit proper
evidence satisfactory to the Trust of their authority so to act.

    6.  TRANSFER TAXES.  The Trust will pay all share transfer taxes, if any,
payable on the transfer to it of Common Shares purchased pursuant to the Offer.
If, however, (a) payment of the Purchase Price is to be made to any person other
than the registered owner(s), (b) (in the circumstances permitted by the Offer)
unpurchased Common Shares are to be registered in the name(s) of any person
other than the registered owner(s) or (c) tendered certificates are registered
in the name(s) of any person other than the person(s) signing this Letter of
Transmittal, the amount of any transfer taxes (whether imposed on the registered
owner(s) or such other persons) payable on account of the transfer to such
person(s) will be deducted from the Purchase Price by the Depositary unless
satisfactory evidence of the payment of such taxes, or exemption therefrom, is
submitted.

    7.  SPECIAL PAYMENT AND DELIVERY INSTRUCTIONS.  If certificates for
unpurchased Common Shares and/or checks are to be issued in the name of a person
other than the signer of this Letter of Transmittal or if such certificates
and/or checks are to be sent to someone other than the signer of this Letter of
Transmittal or to the signer at a different address, the captioned boxes
"Special Payment Instructions" and/or "Special Delivery Instructions" on this
Letter of Transmittal should be completed.

    8.  IRREGULARITIES.  All questions as to the validity, form, eligibility
(including time of receipt) and acceptance of any tender of Common Shares will
be determined by the Trust in its sole discretion, whose determination shall be
final and binding on all parties. The Trust reserves the absolute right to
reject any or all tenders determined by it not to be in appropriate form or the
acceptance of or payment for any Common Shares which may, in the opinion of the
Trust's counsel be unlawful. The Trust also reserves the absolute right to waive
any of the conditions of the Offer or any defect or irregularity in
<PAGE>
tender of any particular Common Shares or any particular shareholder, and the
Trust's interpretations of the terms and conditions of the Offer (including
these instructions) will be final and binding on all parties. Unless waived, any
defects or irregularities in connection with tenders must be cured within such
time as the Trust shall determine. Tendered Common Shares will not be accepted
for payment unless all defects and irregularities have either been cured within
such time or waived by the Trust. None of the Trust, Dean Witter Reynolds Inc.,
the Depositary, or any other person shall be obligated to give notice of defects
or irregularities in tenders, nor shall any of them incur any liability for
failure to give any such notice.

    9.  QUESTIONS AND REQUESTS FOR ASSISTANCE AND ADDITIONAL COPIES.  Questions
and requests for assistance may be directed to Morgan Stanley Dean Witter
Advisors Inc., Two World Trade Center, New York, N.Y. 10048, or by telephone
(800) 869-NEWS extension 61. Additional copies of the Offer to Purchase and this
Letter of Transmittal may be obtained from Morgan Stanley Dean Witter Trust FSB,
(by mail) P.O. Box 984, Jersey City, New Jersey 07303 or (by hand delivery or
courier) Harborside Financial Center, Plaza Two, Jersey City, New Jersey 07311
or by telephone (800) 869-NEWS extension 0.

    10.  SUBSTITUTE FORM W-9.  Each tendering shareholder who has not already
submitted a completed and signed Substitute Form W-9 to the Trust is required to
provide the Depositary with a correct taxpayer identification number ("TIN") on
Substitute Form W-9 which is provided under "Important Tax Information" below,
and to indicate that the shareholder is not subject to backup withholding by
checking the box in Part 2 of the form. Failure to provide the information on
the form or to check the box in Part 2 of the form may subject the tendering
shareholder to 31% federal income tax withholding on the payments made to the
shareholder or other payee with respect to Common Shares purchased pursuant to
the Offer. The box in Part 3 of the Form may be checked if the tendering
shareholder has not been issued a TIN and has applied for a TIN or intends to
apply for a TIN in the near future. If the box in Part 3 is checked and the
Depositary is not provided with a TIN within sixty (60) days, the Depositary
will withhold 31% on all such payments thereafter until a TIN is provided to the
Depositary.

    11.  WITHHOLDING ON FOREIGN SHAREHOLDERS.  The Depositary will withhold
federal income taxes equal to 30% of the gross payments payable to a foreign
shareholder unless the Depositary determines that a reduced rate of withholding
or an exemption from withholding is applicable. For this purpose, a foreign
shareholder is any shareholder that is not (i) a citizen or resident of the
United States, (ii) a corporation, partnership or other entity created or
organized in or under the laws of the United States or any political subdivision
thereof, or (iii) any estate or trust the income of which is subject to United
States federal income taxation regardless of the source of such income. The
Depositary will determine a shareholder's status as a foreign shareholder and
eligibility for a reduced rate of, or an exemption from, withholding by
reference to the shareholder's address and to any outstanding certificates or
statements concerning eligibility for a reduced rate of, or exemption from,
withholding unless facts and circumstances indicate that reliance is not
warranted. A foreign shareholder who has not previously submitted the
appropriate certificates or statements with respect to a reduced rate of, or an
exemption from, withholding for which such shareholder may be eligible should
consider doing so in order to avoid overwithholding. A foreign shareholder may
be eligible to obtain a refund of tax withheld if such shareholder meets one of
the three tests for capital gain or loss treatment described in Section 15 of
the Offer to Purchase or is otherwise able to establish that no tax or a reduced
amount of tax was due.

    IMPORTANT: THIS LETTER OF TRANSMITTAL OR A MANUALLY SIGNED FACSIMILE OF IT
(TOGETHER WITH ANY CERTIFICATES FOR COMMON SHARES AND ALL OTHER REQUIRED
DOCUMENTS) MUST BE RECEIVED BY THE DEPOSITARY ON OR BEFORE THE EXPIRATION DATE.

                           IMPORTANT TAX INFORMATION

    Under federal income tax law, a shareholder whose tendered Common Shares are
accepted for payment is required by law to provide the Depositary with such
shareholder's correct TIN on Substitute Form W-9 below. If the Depositary is not
provided with a certified TIN, the Internal Revenue Service may subject the
shareholder or other payee to a $50 penalty. In addition, payments that are made
to such shareholder or other payee with respect to Common Shares purchased
pursuant to the Offer may be subject to backup withholding.

    Certain shareholders (including, among others, all corporations and certain
foreign individuals) are not subject to these backup withholding and reporting
requirements. In order for a foreign individual to qualify as an exempt
recipient, the shareholder must submit a Form W-8, signed under penalties of
perjury, attesting to that individual's exempt status. A Form W-8 can be
obtained from the Depositary. See the enclosed "Guidelines for Certificate of
Taxpayer Identification Number on Substitute Form W-9" for more instructions.

    If backup withholding applies, the Depositary is required to withhold 31% of
any such payments made to the shareholder or other payee. Backup withholding is
not an additional tax. Rather, the tax liability of persons subject to backup
withholding will be reduced by the amount of tax withheld. If withholding
results in an overpayment of taxes, a refund may be obtained.

PURPOSE OF SUBSTITUTE FORM W-9

    To prevent backup withholding on payments made to a shareholder or other
payee with respect to Common Shares purchased pursuant to the Offer, the
shareholder who has not already submitted a completed and signed Substitute Form
W-9 to the Trust is required to notify the Depositary of the shareholder's
correct TIN by completing the form below, certifying that the TIN provided on
Substitute Form W-9 is correct (or that such shareholder is awaiting a TIN) and
that:

        (a) the shareholder has not been notified by the Internal Revenue
    Service that the shareholder is subject to backup withholding as a result of
    failure to report all interest or dividends; or

        (b) the Internal Revenue Service has notified the shareholder that the
    shareholder is no longer subject to backup withholding.
<PAGE>
WHAT NUMBER TO GIVE THE DEPOSITARY

    The shareholder is required to give the Depositary the TIN (e.g., social
security number or employer identification number) of the record owner of the
Common Shares. If the Common Shares are in more than one name or are not in the
name of the actual owner, consult the enclosed "Guidelines for Certification of
Taxpayer Identification Number on Substitute Form W-9" for additional guidance
on which number to report.

<TABLE>
<C>                                <S>                                                 <C>
- ----------------------------------------------------------------------------------------------------------------------
                                  PAYER'S NAME: MORGAN STANLEY DEAN WITTER TRUST FSB
- ----------------------------------------------------------------------------------------------------------------------

                                   Part 1--PLEASE PROVIDE YOUR TIN IN THE BOX AT           Social Security Number
SUBSTITUTE                         RIGHT AND CERTIFY BY SIGNING AND DATING BELOW.       OR --------------------------
FORM W-9                                                                               Employer Identification Number
                                   -----------------------------------------------------------------------------------
                                   Part 2--Check the box if you are NOT subject to backup withholding under the
                                   provisions of Section 3406(a)(1)(C) of the Internal Revenue Code because (1) you
                                   have not been notified that you are subject to backup withholding as a result of
Department of the Treasury         failure to report all interest or dividends or (2) the Internal Revenue Service has
Internal Revenue Service           notified you that you are no longer subject to backup withholding.  / /
</TABLE>

<TABLE>
<C>                                <S>                                                             <C>
- -------------------------------------------------------------------------------------------------------------------------
                                   CERTIFICATION--UNDER PENALTIES OF PERJURY, I CERTIFY THAT       Part 3
 PAYER'S REQUEST FOR TAXPAYER      THE INFORMATION PROVIDED ON THIS FORM IS TRUE, CORRECT, AND
 IDENTIFICATION NUMBER ("TIN")     COMPLETE.
                                   SIGNATURE --------------------------- DATE ---------------         Awaiting TIN / /
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>

NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP WITHHOLDING
      OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER. PLEASE REVIEW
      THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
      NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.

       YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED THE BOX
                        IN PART 3 OF SUBSTITUTE FORM W-9

<TABLE>
<S>  <C>                                                          <C>
- ----------------------------------------------------------------------
        CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
     I certify under penalties of perjury that a Taxpayer
     Identification Number has not been issued to me, and either
     (a) I have mailed or delivered an application to receive a
     Taxpayer Identification Number to the appropriate Internal
     Revenue Service Center or Social Security Administration
     Office, or (b) I intend to mail or deliver an application in
     the near future. I understand that if I do not provide a
     Taxpayer Identification Number within sixty (60) days, 31%
     of all reportable payments made to me thereafter will be
     withheld until I provide a number.

     ----------------------------------------------------------
     ------------------------------------------
                        SIGNATURE                                            DATE
- ----------------------------------------------------------------------
</TABLE>

<PAGE>
                                                                  EXHIBIT (a)(2)

                ADVERTISEMENT PRINTED IN THE WALL STREET JOURNAL
                                NATIONAL EDITION
<PAGE>

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

THIS ANNOUNCEMENT IS NOT AN OFFER TO PURCHASE OR A SOLICITATION OF AN OFFER TO
   SELL COMMON SHARES. THE OFFER IS MADE ONLY BY THE OFFER TO PURCHASE DATED
     FEBRUARY 16, 2000 AND THE RELATED LETTER OF TRANSMITTAL. THE OFFER IS
     NOT BEING MADE TO, NOR WILL TENDERS BE ACCEPTED FROM OR ON BEHALF OF,
        HOLDERS OF COMMON SHARES IN ANY JURISDICTION IN WHICH MAKING OR
          ACCEPTING THE OFFER WOULD VIOLATE THAT JURISDICTION'S LAWS.


                 MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST

                      NOTICE OF OFFER TO PURCHASE FOR CASH
             12,000,000 OF ITS ISSUED AND OUTSTANDING COMMON SHARES
                      AT NET ASSET VALUE PER COMMON SHARE

    -------------------------------------------------------------------------
THE OFFER, PRORATION PERIOD AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT,
       NEW YORK CITY TIME ON MARCH 17, 2000, UNLESS THE OFFER IS EXTENDED.
    -------------------------------------------------------------------------

     Morgan Stanley Dean Witter Prime Income Trust (the "Trust") is offering to
purchase 12,000,000 of its issued and outstanding common shares of beneficial
interest, par value of $.01 per share ("Common Shares") at a price equal to
their net asset value ("NAV") computed as of 4:00 P.M. New York City time on
March 17, 2000, the Expiration Date, unless extended, upon the terms and
conditions set forth in the Offer to Purchase dated February 16, 2000 and the
related Letter of Transmittal (which together constitute the "Offer"). An "Early
Withdrawal Charge" will be imposed on most Common Shares accepted for payment
that have been held for four years or less. The NAV on February 4, 2000, was
$9.85 per Common Share. The purpose of the Offer is to provide liquidity to
shareholders since the Trust is unaware of any secondary market which exists for
the Common Shares. The Offer is not conditioned upon the tender of any minimum
number of Common Shares.

     If more than 12,000,000 Common Shares are duly tendered prior to the
expiration of the Offer, assuming no changes in the factors originally
considered by the Board of Trustees when it determined to make the Offer and
subject to the other conditions set forth in the Offer, the Trust will either
extend the Offer, if necessary, and increase the number of Common Shares that
the Trust is offering to purchase to an amount which it believes will be
sufficient to accommodate the excess Common Shares tendered as well as any
Common Shares tendered during the extended offer period or purchase 12,000,000
(or such larger number of Common Shares sought) of the Common Shares tendered on
a pro rata basis.

     Common Shares tendered pursuant to the Offer may be withdrawn at any time
prior to 12:00 Midnight, New York City time on March 17, 2000, and, if not yet
accepted for payment by the Trust, Common Shares may also be withdrawn after
April 12, 2000. To be effective, a written, telegraphic, telex or facsimile
transmission notice of withdrawal must be timely received by Morgan Stanley Dean
Witter Trust FSB, the Depositary. Any notice of withdrawal must specify the name
of the person having tendered the Common Shares to be withdrawn, the number of
Common Shares to be withdrawn, and, if certificates representing such Common
Shares have been delivered or otherwise identified to the Depositary, the name
of the registered holder(s) of such Common Shares as set forth in such
certificates if different from the name of the person tendering such Common
Shares. If certificates have been delivered to the Depositary, then, prior to
the release of such certificates, the Shareholder must also submit the
certificate numbers shown on the particular certificates evidencing such Common
Shares and the signature on the notice of withdrawal must be guaranteed by an
eligible guarantor acceptable to the Depositary. Any Common Shares tendered on
behalf of a shareholder by Dean Witter Reynolds Inc. may be withdrawn by Dean
Witter Reynolds Inc.

     The Information required to be disclosed by paragraph (d)(1) of Rule 13e-4
under the Securities Exchange Act of 1934, as amended, is contained in the Offer
to Purchase and is incorporated herein by reference.

     NEITHER THE TRUST NOR ITS BOARD OF TRUSTEES MAKES ANY RECOMMENDATION TO ANY
SHAREHOLDER AS TO WHETHER TO TENDER OR REFRAIN FROM TENDERING ANY OR ALL OF SUCH
SHAREHOLDER'S COMMON SHARES. SHAREHOLDERS ARE URGED TO EVALUATE CAREFULLY ALL
INFORMATION IN THE OFFER TO PURCHASE, CONSULT THEIR OWN INVESTMENT AND TAX
ADVISERS AND MAKE THEIR OWN DECISIONS WHETHER TO TENDER COMMON SHARES AND, IF
SO, HOW MANY COMMON SHARES TO TENDER.

     THE OFFER TO PURCHASE AND THE RELATED LETTER OF TRANSMITTAL CONTAIN
IMPORTANT INFORMATION THAT SHOULD BE READ CAREFULLY BEFORE ANY DECISION IS MADE
WITH RESPECT TO THE OFFER.

     Questions and requests for assistance or current NAV quotations may be
directed to Morgan Stanley Dean Witter Advisors Inc., Two World Trade Center,
New York, NY 10048, telephone 800-869-NEWS extension 0. Requests for copies of
the Offer to Purchase, Letter of Transmittal and any other tender offer
documents may be directed to Morgan Stanley Dean Witter Trust FSB at the address
and telephone number below. Copies will be furnished promptly at no expense to
you.

                   MORGAN STANLEY DEAN WITTER TRUST FSB
            By Mail:                   By Hand Delivery or Courier:
         P.O. Box 984                  Harborside Financial Center
Jersey City, New Jersey 07303                   Plaza Two
                                      Jersey City, New Jersey 07311
                             Attn: Morgan Stanley Dean Witter Prime Income Trust
                                        (800) 869-NEWS extension 0

February 16, 2000

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

<PAGE>
                                                                  EXHIBIT (d)(2)

 Form of Depositary Agreement between the Trust and Morgan Stanley Dean Witter
                                   Trust FSB
<PAGE>
                              DEPOSITARY AGREEMENT

                                                          Date: February 4, 2000

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

Attn:  Ronald E. Robison
       President

       Gentlemen:

    Morgan Stanley Dean Witter Prime Income Trust, a non-diversified, closed-end
management investment company organized as a Massachusetts business trust (the
"Trust") under the name "Allstate Prime Income Trust" is offering to purchase up
to 12,000,000 of its common shares of beneficial interest, par value $.01 per
share ("Common Shares") for cash at a price equal to their net asset value
("NAV") computed as of 4:00 P.M. New York City time on the Expiration Date, upon
the terms and conditions set forth in its Offer to Purchase dated February 16,
2000 (the "Offer to Purchase"), and in the related Letter of Transmittal, copies
of which together, as they may be amended from time to time, constitute the
"Offer." The "Expiration Date" for the Offer shall be 12:00 midnight, New York
City Time, on March 17, 2000, unless and until the Trust shall have extended the
period of time for which the Offer is open, in which event the term "Expiration
Date" shall mean the latest time and date at which the Offer, as so extended by
the Trust, shall expire. All terms not defined herein shall have the same
meaning as in the Offer.

    The Trust hereby agrees with you as follows:

     1. You will act as the Depositary in connection with the Offer. In such
capacity you are authorized and directed to accept tenders of Common Shares in
accordance with the instructions received from the Trust. Tenders of Common
Shares may be made only as set forth in the Offer to Purchase, and tenders shall
be considered properly made to you only when:

        (a) if such Common Shares are evidenced by certificates, certificate(s)
    for such Common Shares, together with a properly completed and duly executed
    Letter of Transmittal or manually executed facsimile thereof and any other
    documents required by the Letter of Transmittal, are received by you on or
    prior to the Expiration Date; or

        (b) if such Common Shares are uncertificated, a properly completed and
    duly executed Letter of Transmittal or manually executed facsimile thereof
    indicating that such Common Shares are registered with you as Transfer Agent
    in the name of the shareholder(s) and any other documents required by the
    Letter of Transmittal, are received by you on or prior to the Expiration
    Date; or

        (c) if such Common Shares are uncertificated and have been tendered by
    Dean Witter Reynolds Inc. ("DWR") on behalf of a shareholder, notification
    is delivered by DWR to you by hand or transmitted by mail, telegram, telex,
    facsimile transmission or by any other acceptable form and are received by
    you on or prior to the Expiration Date, which notification, in whatever
    form, contains the name of the tendering shareholder(s) and the number of
    Common Shares tendered on behalf of such shareholder(s).

    To be considered validly tendered, signatures on all Letters of Transmittal
must be guaranteed by an eligible guarantor acceptable to the Depositary (an
"Eligible Guarantor") (shareholders should contact the Depositary for a
determination as to whether a particular institution is an Eligible

                                       1
<PAGE>
Guarantor), unless the Common Shares tendered thereby are tendered by a
registered holder of Common Shares who has not completed either the box entitled
"Special Delivery Instructions" or the box entitled "Special Payment
Instructions" on the Letter of Transmittal. If the certificates are registered
in the name of a person other than the signer of the Letter of Transmittal, the
certificates must be endorsed or accompanied by appropriate authorizations, in
either case signed exactly as the name or names of the registered owner or
owners appear on the certificates, with the signatures on the certificates or
authorizations guaranteed as aforesaid and accompanied by such other
documentation as is customarily required by transfer agents under such
circumstances. Notwithstanding the foregoing provisions of this paragraph,
Common Shares that the Trust shall approve as having been properly tendered
shall be considered to be properly tendered.

    You are also authorized and directed to return to any person tendering
Common Shares, in the manner described in Section 7 hereof, any certificates
representing Common Shares tendered by such person but duly withdrawn pursuant
to the Offer to Purchase. To be effective, a written, telegraphic, telex or
facsimile transmission notice of withdrawal must be received by you within the
time period specified for withdrawal in the Offer to Purchase at your address
set forth on the back page of the Offer to Purchase. Any notice of withdrawal
must specify the name of the person having deposited the Common Shares to be
withdrawn, the number of Common Shares to be withdrawn and, if the certificates
representing such Common Shares have been delivered or otherwise identified to
you, the name of the registered holder(s) of such Common Shares as set forth in
such certificates. If the certificates have been delivered to you, then prior to
the release of such certificates the tendering stockholder must also submit the
serial numbers shown on the particular certificate evidencing such Common Shares
and the signature on the notice of withdrawal must be guaranteed by an Eligible
Guarantor. If Common Shares have been tendered pursuant to the procedures
described in subparagraph (b) above, the notice of withdrawal must specify the
name and number of the shareholder's account established with you as Transfer
Agent to be credited with the withdrawn Common Shares. If Common Shares have
been tendered on behalf of the shareholder by DWR pursuant to the procedures
described in subparagraph (c) above, a notice of withdrawal which follows the
procedures described above for uncertificated shares may be delivered by DWR.
All questions as to the form and validity (including time of receipt) of notices
of withdrawal will be determined by the Trust in its sole discretion whose
determination shall be final and binding. Any Common Shares withdrawn shall no
longer be considered to be properly tendered unless such Common Shares are
re-tendered on or prior to the Expiration Date pursuant to the Offer to
Purchase.

     2. You are authorized and directed to examine any certificate representing
Common Shares, Letter of Transmittal (or facsimile thereof) and any other
document required by the Letter of Transmittal, which is delivered or mailed to
you to determine whether any tender is defective. In the event that any Letter
of Transmittal or other document has been improperly completed or executed or
any of the certificates for Common Shares are not in proper form for transfer
(as required by the aforesaid instructions) or if some other irregularity in
connection with the tender of Common Shares exists, you are authorized to advise
the tendering stockholder of the existence of the irregularity, but you are not
authorized (unless otherwise instructed by the Trust) to accept any tender of
fractional Common Shares, any tender not in accordance with the terms and
subject to the conditions set forth in the Offer, or any other tender which you
deem to be defective.

    Promptly upon your determination that any tender is defective, you shall,
after consultation with and on the instruction of the Trust, use your best
efforts to notify the person tendering such Common Shares of such determination
and, if applicable, may return the certificates involved to such person in the
manner described in Section 7 hereof. The Trust shall have full discretion to
determine whether any tender is complete and proper and have the absolute right
to reject any or all tenders of any particular Common Shares determined by it
not to be in proper form and to determine whether the acceptance of or payment
for such tenders may, in the opinion of counsel for the Trust, be unlawful; it

                                       2
<PAGE>
being specifically agreed that you shall neither have discretion nor
responsibility with respect to these determinations. The Trust also reserves the
absolute right to waive any of the conditions of the Offer or any defect or
irregularity in the tender of any particular Common Shares. The interpretation
by the Trust of the terms and conditions of the Offer to Purchase and Letter of
Transmittal shall be final and binding.

     3. Any extension of the Offer, as the Trust shall determine, shall be
effective upon notice to you from the Trust given prior to the time the Offer
would otherwise have expired, and shall be promptly confirmed by the Trust in
writing. If at any time the Offer shall be terminated as permitted by the terms
thereof, the Trust shall promptly notify you of such termination.

     4. At 5:00 P.M. New York City time, or as promptly as practicable
thereafter, daily or more frequently if requested as to major tally figures, you
shall advise each of the parties named below by telephone as to (i) the number
of Common Shares duly tendered; (ii) the number of Common Shares defectively
tendered; (iii) the number of Common Shares duly tendered represented by
certificates physically held by you as Transfer Agent; (iv) the number of Common
Shares tendered through DWR; (v) the number of Common Shares withdrawn on such
day; and (vi) the cumulative totals of Common Shares in categories (i) thru (v)
above through 12:00 noon on such day:

    (a) Barry Fink, Esq. or
        Todd Lebo, Esq.
        Morgan Stanley Dean Witter Prime Income Trust
        Two World Trade Center
        New York, New York 10048
        (212) 392-1600

    (b) Mitchell M. Merin
        Morgan Stanley Dean Witter Advisors Inc.
        Two World Trade Center
        New York, New York 10048
        (212) 392-1600

    You should also furnish to the above-named persons a written report
confirming the above information which has been communicated orally on the day
following such oral communication.

    You shall furnish to the above-named persons and the Trust, such reasonable
information on the tendering shareholders as may be requested from time to time.

    You shall furnish to the Trust, upon request, master lists of Common Shares
tendered for purchase, including an A to Z list of the tendering shareholders.

    You are also authorized and directed to provide the persons listed above or
any other persons designated by such persons and approved by the Trust with such
other information relating to the Common Shares, the Offer to Purchase, and
Letters of Transmittal, as the Trust may reasonably request from time to time.

     5. Letters of Transmittal, Telegrams, Telexes, Facsimile Transmissions,
Notices and Letters submitted to you pursuant to the Offer to Purchase shall be
stamped by you to indicate the date and time of the receipt thereof and these
documents, or copies thereof, shall be preserved by you for a reasonable time
not to exceed one year or the term of this Agreement, whichever is longer, and
thereafter shall be delivered by you to the Trust.

     6. (a)  If under the terms and conditions set forth in the Offer to
Purchase the Trust becomes obligated to accept and pay for Common Shares
tendered, upon instruction by the Trust and as promptly as practicable you
shall, subject to Section 7 hereof, deliver or cause to be delivered to the
tendering shareholders and designated payees, consistent with this Agreement and
the Letter of

                                       3
<PAGE>
Transmittal, payment in the amount of the applicable purchase price specified in
the Offer for the Common Shares theretofore properly tendered and purchased
under the terms and conditions of the Offer. The Trust shall ensure that
sufficient funds are available to you to enable you to deliver or cause to be
delivered such payment.

    (b)  At such time as shall be determined by the Trust, you shall effect the
transfer of all Common Shares purchased pursuant to the Offer, in accordance
with instructions from the Trust, and deliver the certificates for such Common
Shares to the Trust.

     7. If, pursuant to the terms and conditions of the Offer, the Trust does
not accept certain of the Common Shares tendered or a shareholder withdraws any
tendered Common Shares, you shall promptly return the deposited certificates, if
any, for such Common Shares and a duplicate of the Letter of Transmittal
relating to such Common Shares, together with any other required documents, to
the persons who deposited the same, without expense to such person. If a
shareholder delivers to you a certificate representing a number of Common Shares
in excess of the number of Common Shares tendered by such shareholder, you shall
promptly after the Expiration Date return to such shareholder a certificate
representing the Common Shares not tendered. Certificates, if any, for such
unpurchased Common Shares shall be forwarded by you by (i) first class mail
under a blanket surety bond protecting you and the Trust from loss or
liabilities arising out of the non-receipt or non-delivery of such Common
Shares; or (ii) registered mail insured separately for the replacement value of
such Common Shares.

     8. You shall take all reasonable action as may from time to time be
requested by the Trust and you shall be reasonably compensated for such action.

     9. For your services as Depositary hereunder you shall be entitled to
compensation as described in the Amended and Restated Transfer Agency and
Service Agreement between you and the Trust dated as of June 22, 1998, as
amended to date.

    10. As Depositary hereunder you:

        (a) shall have no duties or obligations other than those specifically
    set forth herein or in Exhibits A and B hereto, or as may subsequently be
    agreed to by you and the Trust;

        (b) shall have no obligation to make payment for any tendered Common
    Shares unless the Trust shall have provided the necessary funds to pay in
    full all amounts due and payable with respect thereto;

        (c) shall be regarded as making no representations and having no
    responsibilities as to the validity, sufficiency, value or genuineness of
    any certificates of the Common Shares represented thereby deposited with you
    hereunder and will not be required to and will make no representations as to
    the validity, value, or genuineness of the Offer;

        (d) shall not be obligated to take any legal action hereunder and where
    the taking of such action might in your judgment involve any expense or
    liability you shall not act unless you shall have been furnished with an
    indemnity reasonably satisfactory to you;

        (e) may rely on and shall be protected in acting upon any certificate,
    instrument, opinion, notice, letter, telegram, or other document or security
    delivered to you and believed by you to be genuine and to have been signed
    by the proper party or parties;

        (f) may rely on and shall be protected in acting upon the written and
    oral instructions, with respect to any matter relating to your actions as
    Depositary specifically covered by this Agreement (or supplementing or
    qualifying any such actions), of officers of the Trust;

        (g) may consult counsel satisfactory to you, including your in-house
    counsel, and the opinion of such counsel shall be full and complete
    authorization and protection in respect of any action

                                       4
<PAGE>
    taken, suffered, or omitted by you hereunder in good faith and in accordance
    with the opinion of such counsel;

        (h) shall not be called upon at any time to, and shall not, advise any
    person tendering pursuant to the Offer as to the wisdom of making such
    tender or as to the market value of any security tendered thereunder; and

        (i) are not authorized, and shall have no obligation, to pay any
    brokers, dealers, or soliciting fees to any person.

    11. The Trust covenants to indemnify and hold you harmless against any loss,
liability, or expense (including any loss, liability, or expense incurred for
submitting for transfer Common Shares tendered without a signature guarantee
pursuant to the Letter of Transmittal and including the reasonable fees and
expenses of your counsel) incurred without negligence or bad faith on your part
arising out of or in connection with the administration of your duties
hereunder, including the costs and expenses of defending yourself against any
claim or liability in the premises. In no case shall the Trust be liable under
this indemnity with respect to any claim against you unless the Trust shall be
notified by you, by letter or by telex confirmed by letter, of the written
assertion of a claim against you or of any action commenced against you,
promptly after you shall have been served with the summons, or other first legal
process giving information as to the nature and basis of the claim, but failure
to so notify the Trust shall not release the Trust of any liability which it may
otherwise have on account of this Agreement. The Trust shall be entitled to
participate at its own expense in the defense of any suit brought to enforce any
such claim.

    12. Unless terminated earlier by the parties hereto, this Agreement shall
terminate upon conclusion of the Offer.

    13. The instructions contained herein may be modified or supplemented by the
Trust or by an officer thereof authorized to give any notice, approval, or
waiver on its behalf. In the event that any claim of inconsistency between this
Agreement and the terms of the Offer arise, as they may from time to time be
amended, the terms of the Offer shall control, except with respect to the
duties, liabilities and indemnification of you as Depositary which shall be
controlled by the terms of this Agreement.

    14. If any provision of this Agreement shall be held illegal, invalid, or
unenforceable by any court, this Agreement shall be construed and enforced as if
such provision had not been contained herein and shall be deemed an Agreement
among us to the full extent permitted by applicable law.

    15. This Agreement shall be governed by and construed in accordance with the
laws of the State of New York, and shall inure to the benefit of and be binding
upon the successors and assigns of the parties hereto; provided that this
Agreement may not be assigned by you without the prior written consent of the
Trust.

                                       5
<PAGE>
    Please acknowledge receipt of this Letter, the Offer to Purchase and the
Letter of Transmittal and confirm the arrangements herein provided by signing
and returning the enclosed copy hereof, whereupon this Agreement and your
acceptance of the terms and conditions herein provided shall constitute a
binding Agreement between us.

                                          Very truly yours,

                                          MORGAN STANLEY DEAN WITTER
                                          PRIME INCOME TRUST

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

                                                       (Name & Title)

Accepted as of the date
first above written:

MORGAN STANLEY DEAN WITTER TRUST
 FSB, as DEPOSITARY

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

             (Name & Title)

                                       6

<PAGE>
                                                                  EXHIBIT (d)(4)

 New Investment Advisory Agreement dated May 31, 1997, and amended as of May 1,
                                     1998.
<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.

                                        1
<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>
                                                                  EXHIBIT (d)(5)

                   Distribution Agreement dated May 31, 1997.
<PAGE>
                              PRIME INCOME TRUST

                            DISTRIBUTION AGREEMENT

   AGREEMENT made as of this 31st day of May, 1997 between Prime Income
Trust, an unincorporated business trust organized under the laws of the
Commonwealth of Massachusetts (the "Fund"), and Dean Witter Distributors
Inc., a Delaware corporation (the "Distributor"), and Dean Witter
InterCapital Inc., a Delaware corporation (the "Adviser").

                             W I T N E S S E T H:

   WHEREAS, the Fund is registered under the Investment Company Act of 1940,
as amended (the "1940 Act"), as a non-diversified closed-end investment
company and it is in the interest of the Fund to offer its shares of
beneficial interest, par value $.01 per share (the "Shares"), for sale
continuously; and

   WHEREAS, the Fund and the Distributor wish to enter into an agreement with
one another with respect to the continuous offering of the Shares in order to
promote the growth of the Fund and facilitate the distribution of its Shares,
and

   WHEREAS, the Adviser is the investment adviser to the Fund and is
registered as an investment adviser under the Investment Advisers Act of
1940.

   NOW, THEREFORE, the parties agree as follows:

   SECTION 1. APPOINTMENT OF THE DISTRIBUTOR. (a) The Fund hereby appoints
the Distributor as the principal underwriter of the Fund to sell Shares to
the public on the terms set forth in this Agreement and the Fund's prospectus
and the Distributor hereby accepts such appointment and agrees to act
hereunder. The Fund, during the term of this Agreement, shall sell Shares to
the Distributor upon the terms and conditions set forth herein.

   (b) The Distributor agrees to purchase Shares, as principal for its own
account, from the Fund and to sell Shares as principal to investors and
securities dealers, including Dean Witter Reynolds Inc. ("DWR"), an affiliate
of the Distributor and the Adviser, upon the terms described herein and in
the Fund's prospectus (the "Prospectus") included in the Fund's registration
statement (the "Registration Statement") most recently filed from time to
time with the Securities and Exchange Commission (the "SEC") and effective
under the Securities Act of 1933, as amended (the "1933 Act") and the 1940
Act or as said Prospectus may be otherwise amended or supplemented and filed
with the SEC pursuant to Rule 497 under the 1933 Act.

   (c) The Distributor agrees not to make a secondary market in the Shares or
purchase or hold Shares in inventory for purposes of resale and pursuant to
the terms of selected dealer agreements referred to in Section 7 below,
selected dealers will similarly agree.

   SECTION 2. EXCLUSIVE NATURE OF DUTIES. The Distributor shall be the
exclusive principal underwriter and distributor of the Fund, except that the
exclusive rights granted to the Distributor to sell the Shares shall not
apply to Shares issued by the Fund: (i) in connection with the merger or
consolidation of any other investment company or personal holding company
with the Fund or the acquisition by purchase or otherwise of all (or
substantially all) the assets or the outstanding shares of any such company
by the Fund; or (ii) pursuant to reinvestment of dividends or capital gains
distributions.

   SECTION 3. PURCHASE OF SHARES FROM THE FUND. (a) The Distributor shall
have the right to buy from the Fund the Shares needed, but not more than the
Shares needed (except for clerical errors in transmission), to fill
unconditional orders for Shares placed with the Distributor by investors and
securities dealers. The price which the Distributor shall pay for the Shares
so purchased from the Fund shall be the net asset value, determined as set
forth in the Prospectus used in determining the public offering price on
which such orders were based.

   (b) The Shares are to be resold by the Distributor at the public offering
price, as set forth in the Prospectus to investors or to securities dealers
including DWR, who have entered into selected dealer agreements with the
Distributor pursuant to Section 7 ("Selected Dealers").

   (c) The Adviser shall pay, or cause an affiliate to pay, the Distributor a
fee equal to 2.75% of the per share net asset value, determined as set forth
in the Prospectus, of Shares purchased from the Fund and

                                        1
<PAGE>
sold by the Distributor in the continuous offering. Pursuant to the selected
dealer agreements referred to in Section 7 below, the Distributor shall pay
Selected Dealers any amounts due to them in connection with the sale of
Shares in the continuous offering. If Shares remain outstanding after one
year from the date of their initial purchase, the Adviser will compensate, or
cause an affiliate to compensate, the Distributor and Selected Dealers at an
annual rate, paid annually, equal to 0.10% of the value of Shares sold by the
Distributor or selected dealers and remaining outstanding. The 0.10% fee
referred to in the preceding sentence will begin accruing after one year from
the date of initial purchase of the Shares. The compensation paid to the
Distributor and Selected Dealers under this Section 3(c) and the early
withdrawal charge, if any, referred to in Section 4(a) will not in the
aggregate exceed the applicable limit (currently 7.25%) as determined from
time to time by the Association of the National Association of Securities
Dealers, Inc. (the "NASD").

   (d) The Fund shall have the right to suspend the sale of the Shares if
trading on the New York Stock Exchange shall have been suspended, if a
banking moratorium shall have been declared by federal or New York
authorities, if such suspension is required in order to comply with the rules
and regulations of the SEC, including Rule 10b-6 under the Securities
Exchange Act of 1934, as amended (the "1934 Act"), if such suspension is
required in response to general market conditions in the portfolio securities
of the Fund, or if there shall have been some other event which, in the
judgment of the Fund, makes it impracticable or inadvisable to sell the
Shares.

   (e) The Fund, or any agent of the Fund designated in writing by the Fund,
shall be promptly advised of all purchase orders for Shares received by the
Distributor. Any order may be rejected by the Fund; provided, however, that
the Fund will not arbitrarily or without reasonable cause refuse to accept
orders for the purchase of Shares. The Distributor will confirm orders upon
their receipt, and the Fund (or its agent) upon receipt of payment therefor
and instructions will deliver share certificates for such Shares or a
statement confirming the issuance of Shares. Payment shall be made to the
Fund in New York Clearing House funds. The Distributor agrees to cause such
payment and such instructions to be delivered promptly to the Fund (or its
agent).

   (f) With respect to Shares sold by any Selected Dealer, the Distributor is
authorized to direct the Fund's transfer agent to receive instructions
directly from the Selected Dealer on behalf of the Distributor as to
registration of Shares in the names of investors and to confirm issuance of
the Shares to such investors. The Distributor is also authorized to instruct
the transfer agent to receive payment directly from the Selected Dealer on
behalf of the Distributor, for prompt transmittal to the Fund's custodian, of
the purchase price of the Shares. In such event the Distributor shall obtain
from the Selected Dealer and maintain a record of such registration
instructions and payments.

   SECTION 4. REPURCHASE OF SHARES BY THE FUND. (a) Any of the outstanding
Shares may be tendered for repurchase pursuant to a tender offer made by the
Fund, and the Fund agrees to repurchase the Shares so tendered in accordance
with the requirements of the 1934 Act and the rules and regulations
thereunder and the applicable tender offer provisions set forth in the
Prospectus of the Fund. The price to be paid to repurchase the Shares shall
be equal to the net asset value, determined as set forth in the Prospectus,
less the early withdrawal charge, if any, as described in the Prospectus. All
payments by the Fund hereunder shall be made in the manner set forth below.

   The Fund shall pay the total amount of the repurchase price as defined in
the above paragraph pursuant to the instructions of the Distributor or return
the tendered shares promptly following the termination or withdrawal of the
tender offer.

   The proceeds of any repurchase of shares shall be paid by the Fund as
follows: (i) any applicable early withdrawal charge shall be paid to the
Adviser and (ii) the balance shall be paid to or for the account of the
shareholder, in each case in accordance with the applicable provisions of the
Prospectus.

   (b) Repurchases of Shares pursuant to a tender offer or payment may be
suspended at such times as may be determined by the Board of Trustees of the
Fund as set forth in the Prospectus including, without limitation, in order
to comply with Rule 10b-6 under the 1934 Act.

   (c) With respect to Shares tendered for redemption or repurchase by any
Selected Dealer on behalf of its customers, the Distributor is authorized to
instruct the transfer agent of the Fund to accept orders

                                        2
<PAGE>
for redemption or repurchase directly from the Selected Dealer on behalf of
the Distributor and to instruct the Fund to transmit payments for such
redemptions and repurchases directly to the Selected Dealer on behalf of the
Distributor for the account of the shareholder. The Distributor shall obtain
from the Selected Dealer, and shall maintain, a record of such orders. The
Distributor is further authorized to obtain from the Fund, and shall
maintain, a record of payments made directly to the Selected Dealer on behalf
of the Distributor.

   SECTION 5. DUTIES OF THE FUND. (a) The Fund shall furnish to the
Distributor copies of all information, financial statements and other papers
which the Distributor may reasonably request for use in connection with the
distribution of the Shares, including one certified copy, upon request by the
Distributor, of all financial statements prepared by the Fund and examined by
independent accountants. The Fund shall, at the expense of the Distributor,
make available to the Distributor such number of copies of the Prospectus as
the Distributor shall reasonably request.

   (b) The Fund shall take, from time to time, but subject to the necessary
approval of its shareholders, all necessary action to register Shares under
the 1933 Act, to the end that there will be available for sale such number of
Shares as investors may reasonably be expected to purchase.

   (c) The Fund shall use its best efforts to pay the filing fees for an
appropriate number of the Shares for sale under the securities laws of such
states as the Distributor and the Fund may approve. Any qualification to sell
its Shares in a state may be withheld, terminated or withdrawn by the Fund at
any time in its discretion. As provided in Section 8(c) hereof, such filing
fees shall be borne by the Fund. The Distributor shall furnish any
information and other material relating to its affairs and activities as may
be required by the Fund in connection with the sale of its Shares in any
state.

   (d) The Fund shall, at the expense of the Distributor, furnish, in
reasonable quantities upon request by the Distributor, copies of annual and
interim reports by the Fund.

   SECTION 6. DUTIES OF THE DISTRIBUTOR. (a) The Distributor shall sell
Shares of the Fund through DWR and may sell Shares through other securities
dealers and its own Account Executives and shall devote reasonable time and
effort to promote and sell any specific number of Shares. The services of the
Distributor hereunder are not exclusive and it is understood that the
Distributor may act as principal underwriter for other registered investment
companies so long as the performance of its obligations hereunder is not
impaired hereby. It is also understood that Selected Dealers, including DWR,
may also sell shares for other registered investment companies.

   (b) Neither the Distributor nor any Selected Dealers shall give any
information or make any representations, other than those contained in the
Registration Statement or related Prospectus and any sales literature
specifically approved by the Fund.

   (c) The Distributor agrees that it will comply with the applicable terms
and limitations of the Rules of the NASD.

   SECTION 7. SELECTED DEALER AGREEMENTS. (a) The Distributor shall have the
right to enter into selected dealer agreements with Securities Dealers for
the sale of the Shares; provided, that the Fund shall approve the forms of
agreements with dealers. Shares sold to Selected Dealers shall be for resale
by such dealers only at the public offering price as set forth in the
Prospectus.

   (b) Within the United States, the Distributor shall offer and sell shares
only to Selected Dealers that are members in good standing of the NASD.

   (c) The Distributor shall adopt and follow procedures, as approved by the
Fund, for the confirmation of sales of Shares to investors and Selected
Dealers, the collection of amounts payable by investors and Selected Dealers
on such sales, and the cancellation of unsettled transactions, as may be
necessary to comply with the requirements of the NASD, as such requirements
may from time to time exist.

   SECTION 8. PAYMENT OF EXPENSES. (a) The Distributor shall bear all
expenses incurred by it in connection with its duties and activities under
this Agreement including the payment to Selected Dealers

                                        3
<PAGE>
of any sales commissions for sales of the Fund's Shares (except such expenses
as are specifically undertaken herein by the Fund). It is understood and
agreed that any expenses incurred by the Distributor hereunder may be paid
from amounts received by it from the Adviser pursuant to Section 3(c) hereof.

   (b) The Fund shall bear all costs and expenses of the Fund, including fees
and disbursements of legal counsel including counsel to the Trustees of the
Fund who are not interested persons (as defined in the 1940 Act) of the Fund
or the Distributor, and independent accountants, in connection with the
preparation and filing of any required Registration Statements and
Prospectuses and all amendments and supplements thereto, and the expenses of
preparing, printing, mailing and otherwise distributing prospectuses and
statements of additional information, annual or interim reports or proxy
materials to shareholders.

   (c) The Fund shall pay the filing fees, and, if necessary or advisable in
connection therewith, bear the cost and expense of qualifying the Fund as a
broker or dealer, in such states of the United States or other jurisdictions
as shall be selected by the Fund and the Distributor pursuant to Section 5(c)
hereof and the cost and expenses payable to each such state for continuing to
offer Shares therein until the Fund decides to discontinue selling Shares
pursuant to Section 5(c) hereof.

   SECTION 9. INDEMNIFICATION. (a) The Fund shall indemnify and hold harmless
the Distributor and each person, if any, who controls the Distributor against
any loss, liability, claim, damage or expense (including the reasonable cost
of investigating or defending any alleged loss, liability, claim, damage or
expense and reasonable counsel fees incurred in connection therewith), as
incurred, arising by reason of any person acquiring any Shares, which may be
based upon the 1933 Act, or on any other statute or at common law, on the
ground that the Registration Statement or related Prospectus, as from time to
time amended and supplemented, or an annual or interim report to shareholders
of the Fund, includes an untrue statement of a material fact or omits to
state a material fact required to be stated therein or necessary in order to
make the statements therein not misleading, unless such statement or omission
was made in reliance upon, and in conformity with, information furnished to
the Fund in connection therewith by or on behalf of the Distributor;
provided, however, that in no case (i) is the indemnity of the Fund in favor
of the Distributor and any such controlling persons to be deemed to protect
the Distributor or any such controlling persons thereof against any liability
to the Fund or its security holders to which the Distributor or any such
controlling persons would otherwise be subject by reason of willful
misfeasance, bad faith or gross negligence in the performance of its duties
or by reason of reckless disregard of its obligations and duties under this
Agreement; or (ii) is the Fund to be liable under its indemnity agreement
contained in this paragraph with respect to any claim made against the
Distributor or any such controlling persons, unless the Distributor or such
controlling persons, as the case may be, shall have notified the Fund in
writing within a reasonable time after the summons or other first legal
process giving information of the nature of the claim shall have been served
upon the Distributor or such controlling persons (or after the Distributor or
such controlling persons shall have received notice of such service on any
designated agent), but failure to notify the Fund of any such claim shall not
relieve it from any liability which it may have to the person against whom
such action is brought otherwise than on account of its indemnity agreement
contained in this paragraph. The Fund will be entitled to participate at its
own expense in the defense or if it so elects, to assume the defense, of any
suit brought to enforce any such liability, but if the Fund elects to assume
the defense, such defense shall be conducted by counsel chosen by it and
satisfactory to the Distributor or such controlling person or persons,
defendant or defendants in the suit. In the event the Fund elects to assume
the defense of any such suit and retain such counsel, the Distributor or such
controlling person or persons, defendant or defendants in the suit, shall
bear the fees and expenses of any additional counsel retained by them, but,
in case the Fund does not elect to assume the defense of any such suit, it
will reimburse the Distributor or such controlling person or persons,
defendant or defendants in the suit, for the reasonable fees and expenses of
any counsel retained by them. The Fund shall promptly notify the Distributor
of the commencement of any litigation or proceedings against it or any of its
officers or trustees in connection with the issuance or sale of the Shares.

   (b) (i) The Distributor shall indemnify and hold harmless the Fund and
each of its trustees and officers and each person, if any, who controls the
Fund against any loss, liability, claim, damage or

                                        4
<PAGE>
expense, as incurred, described in the foregoing indemnity contained in
subsection (a) of this Section, but only with respect to statements or
omissions made in reliance upon, and in conformity with, information
furnished to the Fund in writing by or on behalf of the Distributor for use
in connection with the Registration Statement or related Prospectus, as from
time to time may be amended, or the annual or interim reports to
shareholders.

   (b)(ii) The Distributor shall indemnify and hold harmless the Fund and the
Fund's transfer agent, individually and in its capacity as the Fund's
transfer agent, from and against any claims, damages and liabilities which
arise as a result of actions taken pursuant to instructions from, or on
behalf of, the Distributor to: (1) redeem all or a part of shareholder
accounts in the Fund pursuant to Section 4(c) hereof and pay the proceeds to,
or as directed by, the Distributor for the account of each shareholder whose
Shares are so redeemed and (2) register Shares in the names of investors,
confirm the issuance thereof and receive payment therefor pursuant to Section
3(f).

   (b)(iii) In case any action shall be brought against the Fund or any
person so indemnified by this subsection 9(b) in respect of which indemnity
may be sought against the Distributor, the Distributor shall have the rights
and duties given to the Fund, and the Fund and each person so indemnified
shall have the rights and duties given to the Distributor by the provisions
of subsection (a) of this Section 9.

   (c) If the indemnification provided for in this Section 9 is unavailable
or insufficient to hold harmless an indemnified party under subsection (a) or
(b) above in respect of any losses, claims, damages, liabilities or expenses
(or actions in respect thereof) referred to herein, then each indemnifying
party shall contribute to the amount paid or payable by such indemnified
party as a result of such losses, claims, damages, liabilities or expenses
(or actions in respect thereof) in such proportion as is appropriate to
reflect the relative benefits received by the Fund on the one hand and the
Distributor on the other from the offering of the Shares. If, however, the
allocation provided by the immediately preceding sentence is not permitted by
applicable law, then each indemnifying party shall contribute to such amount
paid or payable by such indemnified party in such proportion as is
appropriate to reflect not only such relative benefits but also the relative
fault of the Fund on the one hand and the Distributor on the other in
connection with the statements or omissions which resulted in such losses,
claims, damages, liabilities or expenses (or actions in respect thereof), as
well as any other relevant equitable considerations. The relative benefits
received by the Fund on the one hand and the Distributor on the other shall
be deemed to be in the same proportion as the total net proceeds from the
offering (before deducting expenses) received by the Fund bear to the total
compensation received by the Distributor, in each case as set forth in the
Prospectus. The relative fault shall be determined by reference to, among
other things, whether the untrue or alleged untrue statement of a material
fact or the omission or alleged omission to state a material fact relates to
information supplied by the Fund or the Distributor and the parties' relative
intent, knowledge, access to information and opportunity to correct or
prevent such statement or omission. The Fund and the Distributor agree that
it would not be just and equitable if contribution were determined by pro
rata allocation or by any other method of allocation which does not take into
account the equitable considerations referred to above. The amount paid or
payable by an indemnified party as a result of the losses, claims, damages,
liabilities or expenses (or actions in respect thereof) referred to above
shall be deemed to include any legal or other expenses reasonably incurred by
such indemnified party in connection with investigating or defending any such
claim. Notwithstanding the provisions of this subsection (c), the Distributor
shall not be required to contribute any amount in excess of the amount by
which the total price at which the Shares distributed by it to the public
were offered to the public exceeds the amount of any damages which it has
otherwise been required to pay by reason of such untrue or alleged untrue
statement or omission or alleged omission. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the 1933 Act) shall
be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation.

   SECTION 10. DURATION AND TERMINATION OF THIS AGREEMENT. This Agreement
shall become effective as of the date first above written and shall remain in
force until April 30, 1998 and thereafter, but only so long as such
continuance is specifically approved at least annually by (i) the Trustees of
the Fund, or by the vote of a majority of the outstanding voting securities
of the Fund, cast in person or by proxy, and (ii) a majority of those
Trustees who are not parties to this Agreement or interested persons of any
such party cast in person at a meeting called for the purpose of voting upon
such approval.

                                        5
<PAGE>
   This Agreement may be terminated at any time, without the payment of any
penalty, by the Trustees of the Fund, by a majority of the Trustees of the
Fund who are not interested persons of the Fund, or by vote of a majority of
the outstanding voting securities of the Fund, or by the Distributor on sixty
days' written notice to the other party. This Agreement shall automatically
terminate in the event of its assignment. The terms "vote of a majority of
the outstanding voting securities," "assignment" and "interested person,"
when used in this Agreement, shall have the respective meanings specified in
the 1940 Act.

   SECTION 11. AMENDMENTS OF THIS AGREEMENT. This Agreement may be amended by
the parties only if such amendment is specifically approved by (i) the
Trustees of the Fund, or by the vote of a majority of outstanding voting
securities of the Fund, and (ii) a majority of those Trustees of the Fund who
are not parties to this Agreement or interested persons of any such party
cast in person at a meeting called for the purpose of voting on such
approval.

   SECTION 12. GOVERNING LAW. This Agreement shall be construed in accordance
with the law of the State of New York and the applicable provisions of the
1940 Act. To the extent that the applicable law of the State of New York, or
any of the provisions herein, conflict with the applicable provisions of the
1940 Act, the latter shall control.

   SECTION 13. PERSONAL LIABILITY. The Declaration of Trust establishing
Prime Income Trust, under the name "Allstate 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 Allstate Prime 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.

   IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement as of the day and year first above written in New York, New York.

                                          PRIME INCOME TRUST

                                          By:
                                             -----------------------------------
                                                 (Authorized Signature)

                                          DEAN WITTER INTERCAPITAL INC.

                                          By:
                                             -----------------------------------
                                                 (Authorized Signature)

                                          DEAN WITTER DISTRIBUTORS INC.

                                          By:
                                             -----------------------------------
                                                 (Authorized Signature)

                                        6


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