WITTER DEAN U S GOVERNMENT SECURITIES TRUST
485BPOS, 1998-04-17
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<PAGE>
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 17, 1998
 
                                                      REGISTRATION NOS.  2-86966
                                                                        811-3870
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                ----------------
 
                                   FORM N-1A
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933                     /X/
                          PRE-EFFECTIVE AMENDMENT NO.                        / /
                       POST-EFFECTIVE AMENDMENT NO. 16                       /X/
                                     AND/OR
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940                                /X/
                               AMENDMENT NO. 18                              /X/
                              -------------------
 
                        (CHECK APPROPRIATE BOX OR BOXES)
                                ----------------
 
                  DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
                        (A MASSACHUSETTS BUSINESS TRUST)
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
 
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE (212) 392-1600
 
                                BARRY FINK, ESQ.
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)
                            ------------------------
 
                                    COPY TO:
                            DAVID M. BUTOWSKY, ESQ.
                             GORDON ALTMAN BUTOWSKY
                             WEITZEN SHALOV & WEIN
                              114 WEST 47TH STREET
                            NEW YORK, NEW YORK 10036
                                ----------------
 
                 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
 
 As soon as practicable after this Post-Effective Amendment becomes effective.
 
 IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE (CHECK APPROPRIATE BOX)
 
        _X_ immediately upon filing pursuant to paragraph (b)
 
        ___ on (date) pursuant to paragraph (b)
 
        ___ 60 days after filing pursuant to paragraph (a)
 
        ___ on (date) pursuant to paragraph (a) of rule 485.
 
           Amending the Prospectus and Updating Financial Statements
 
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<PAGE>
                  DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
 
                             CROSS-REFERENCE SHEET
 
                                   FORM N-1A
 
<TABLE>
<CAPTION>
ITEM                                                                         CAPTION
- ---------------------------------------------  -------------------------------------------------------------------
<S>                                            <C>
PART A                                                                     PROSPECTUS
 1.  ........................................  Cover Page
 
 2.  ........................................  Prospectus Summary; Summary of Fund Expenses
 
 3.  ........................................  Financial Highlights; Performance Information
 
 4.  ........................................  Investment Objective and Policies; The Fund and Its Management,
                                                Cover Page; Investment Restrictions; Prospectus Summary; Financial
                                                Highlights
 
 5.  ........................................  The Fund and Its Management; Back Cover; Investment Objective and
                                                Policies
 
 6.  ........................................  Dividends, Distributions and Taxes; Additional Information
 
 7.  ........................................  Purchase of Fund Shares; Shareholder Services; Prospectus Summary
 
 8.  ........................................  Redemptions and Repurchases; Shareholder Services
 
 9.  ........................................  Not Applicable
 
PART B                                                         STATEMENT OF ADDITIONAL INFORMATION
10.  ........................................  Cover Page
 
11.  ........................................  Table of Contents
 
12.  ........................................  The Fund and Its Management
 
13.  ........................................  Investment Practices and Policies; Investment Restrictions;
                                                Portfolio Transactions and Brokerage
 
14.  ........................................  The Fund and Its Management; Trustees and Officers
 
15.  ........................................  The Fund and Its Management; Trustees and Officers
 
16.  ........................................  The Fund and Its Management; The Distributor; Shareholder Services;
                                                Custodian and Transfer Agent; Independent Accountants
 
17.  ........................................  Portfolio Transactions and Brokerage
 
18.  ........................................  Shares of the Fund
 
19.  ........................................  The Distributor; Redemptions and Repurchases; Financial Statements;
                                                Determination of Net Asset Value; Shareholder Services
 
20.  ........................................  Dividends, Distributions and Taxes; Financial Statements
 
21.  ........................................  The Distributor
 
22.  ........................................  Performance Information
 
23.  ........................................  Experts; Financial Statements
</TABLE>
 
PART C
 
    Information required to be included in Part C is set forth under the
appropriate item, so numbered, in Part C of this Registration Statement.
<PAGE>
   
              PROSPECTUS
              APRIL 17, 1998
    
 
              Dean Witter U.S. Government Securities Trust (the "Fund") is an
open-end diversified management investment company whose investment objective is
high current income consistent with safety of principal. The Fund offers a
convenient and economical way for persons to invest in a professionally managed
diversified portfolio of obligations issued or guaranteed by the U.S. Government
or its instrumentalities. All such obligations are backed by the full faith and
credit of the United States. No assurance can be given that the Fund's objective
will be realized. Shares of the Fund are not sponsored, guaranteed, endorsed or
insured by the U.S. Government or any agency thereof.
 
   
               The Fund offers four classes of shares (each, a "Class"), each
with a different combination of sales charges, ongoing fees and other features.
The different distribution arrangements permit an investor to choose the method
of purchasing shares that the investor believes is most beneficial given the
amount of the purchase, the length of time the investor expects to hold the
shares and other relevant circumstances. See "Purchase of Fund
Shares--Alternative Purchase Arrangements."
    
 
   
               This Prospectus sets forth concisely the information you should
know before investing in the Fund. It should be read and retained for future
reference. Additional information about the Fund is contained in the Statement
of Additional Information, dated April 17, 1998, which has been filed with the
Securities and Exchange Commission, and which is available at no charge upon
request of the Fund at the address or telephone numbers listed on this page. The
Statement of Additional Information is incorporated herein by reference.
    
 
     DEAN WITTER DISTRIBUTORS INC.
      DISTRIBUTOR
 
      TABLE OF CONTENTS
 
   
Prospectus Summary/2
Summary of Fund Expenses/4
Financial Highlights/6
The Fund and its Management/9
Investment Objective and Policies/9
  Risk Considerations/13
Purchase of Fund Shares/15
Shareholder Services/27
Redemptions and Repurchases/30
Dividends, Distributions and Taxes/31
Performance Information/32
Additional Information/32
    
 
SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, AND THE SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT
INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
    Dean Witter
    U.S. Government Securities Trust
    Two World Trade Center
    New York, New York 10048
    (212) 392-2550 or
    (800) 869-NEWS (toll-free)
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>                 <C>
The                 The Fund is organized as a Trust, commonly known as a Massachusetts business trust, and is an open-end
Fund                diversified management investment company investing in obligations issued or guaranteed by the U.S. Government.
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Shares Offered      Shares of beneficial interest with $0.01 par value (see page 32). The Fund offers four Classes of shares, each
                    with a different combination of sales charges, ongoing fees and other features (see pages 15-24).
- ------------------------------------------------------------------------------------------------------------------------------------
Minimum             The minimum initial investment for each Class is $1,000 ($100 if the account is opened through
Purchase            EasyInvest-SM-). Class D shares are only available to persons investing $5 million ($25 million for certain
                    qualified plans) or more and to certain other limited categories of investors. For the purpose of meeting the
                    minimum $5 million (or $25 million) investment for Class D shares, and subject to the $1,000 minimum initial
                    investment for each Class of the Fund, an investor's existing holdings of Class A shares and shares of funds for
                    which Dean Witter InterCapital Inc. serves as investment manager ("Dean Witter Funds") that are sold with a
                    front-end sales charge, and concurrent investments in Class D shares of the Fund and other Dean Witter Funds
                    that are multiple class funds, will be aggregated. The minimum subsequent investment is $100 (see page 16).
- ------------------------------------------------------------------------------------------------------------------------------------
Investment          The investment objective of the Fund is high current income consistent with safety of principal.
Objective
- ------------------------------------------------------------------------------------------------------------------------------------
Investment          Dean Witter InterCapital Inc., the Investment Manager of the Fund, and its wholly-owned subsidiary, Dean Witter
Manager             Services Company Inc., serve in various investment management, advisory, management and administrative
                    capacities to 101 investment companies and other portfolios with assets of approximately $113 billion at March
                    31, 1998 (see page 9).
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Management          The Investment Manager receives a monthly fee at the annual rate of 0.50% (1/2 of 1%) of daily net assets,
Fee                 scaled down on assets over $1 billion. The fee should not be compared with fees paid by other investment
                    companies without also considering applicable sales loads and distribution fees, including those noted below
                    (see page 9).
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Distributor and     Dean Witter Distributors Inc. (the "Distributor"). The Fund has adopted a distribution plan pursuant to Rule
Distribution Fee    12b-1 under the Investment Company Act (the "12b-1 Plan") with respect to the distribution fees paid by the
                    Class A, Class B and Class C shares of the Fund to the Distributor. The entire 12b-1 fee payable by Class A and
                    a portion of the 12b-1 fee payable by each of Class B and Class C equal to 0.20% of the average daily net assets
                    of Class B and 0.25% of the average daily net assets of Class C are currently each characterized as a service
                    fee within the meaning of the National Association of Securities Dealers, Inc. guidelines. The remaining portion
                    of the 12b-1 fee, if any, is characterized as an asset-based sales charge (see pages 15 and 24).
- ------------------------------------------------------------------------------------------------------------------------------------
Alternative         Four classes of shares are offered:
Purchase
Arrangements        - Class A shares are offered with a front-end sales charge, starting at 4.25% and reduced for larger purchases.
                    Investments of $1 million or more (and investments by certain other limited categories of investors) are not
                    subject to any sales charge at the time of purchase but a contingent deferred sales charge ("CDSC") of 1.0% may
                    be imposed on redemptions within one year of purchase. The Fund is authorized to reimburse the Distributor for
                    specific expenses incurred in promoting the distribution of the Fund's Class A shares and servicing shareholder
                    accounts pursuant to the Fund's 12b-1 Plan. Reimbursement may in no event exceed an amount equal to payments at
                    an annual rate of 0.25% of average daily net assets of the Class (see pages 15, 19 and 24).
</TABLE>
    
 
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                                       2
<PAGE>
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<TABLE>
<S>                 <C>
                    - Class B shares are offered without a front-end sales charge, but will in most cases be subject to a CDSC
                    (scaled down from 5.0% to 1.0%) if redeemed within six years after purchase. The CDSC will be imposed on any
                    redemption of shares if after such redemption the aggregate current value of a Class B account with the Fund
                    falls below the aggregate amount of the investor's purchase payments made during the six years preceding the
                    redemption. A different CDSC schedule applies to investments by certain qualified plans. Class B shares are also
                    subject to a 12b-1 fee assessed at the annual rate of 0.75% (0.65% on amounts over $10 billion) of the lesser
                    of: (a) the average daily net sales of the Fund's Class B shares or (b) the average daily net assets of Class B.
                    All shares of the Fund held prior to July 28, 1997 (other than the shares held by certain employee benefit plans
                    established by Dean Witter Reynolds Inc. and its affiliate, SPS Transaction Services, Inc.) have been designated
                    Class B shares. Shares held by those employee benefit plans prior to July 28, 1997 have been designated Class D
                    shares. Shares held before May 1, 1997 that have been designated Class B shares will convert to Class A shares
                    in May, 2007. In all other instances, Class B shares convert to Class A shares approximately ten years after the
                    date of the original purchase (see pages 15, 21 and 24).
                    - Class C shares are offered without a front-end sales charge, but will in most cases be subject to a CDSC of
                    1.0% if redeemed within one year after purchase. The Fund is authorized to reimburse the Distributor for
                    specific expenses incurred in promoting the distribution of the Fund's Class C shares and servicing shareholder
                    accounts pursuant to the Fund's 12b-1 Plan. Reimbursement may in no event exceed an amount equal to payments at
                    an annual rate of 0.75% of average daily net assets of the Class (see pages 15 and 24).
                    - Class D shares are offered only to investors meeting an initial investment minimum of $5 million ($25 million
                    for certain qualified plans) and to certain other limited categories of investors. Class D shares are offered
                    without a front-end sales charge or CDSC and are not subject to any 12b-1 fee (see pages 15 and 24).
- ------------------------------------------------------------------------------------------------------------------------------------
Dividends           Dividends from net investment income are declared daily and paid monthly and distributions from net capital
and                 gains, if any, are paid at least once per year. The Fund may, however, determine to retain all or part of any
Capital Gains       net long-term capital gains in any year for reinvestment. Dividends and capital gains distributions paid on
Distributions       shares of a Class are automatically reinvested in additional shares of the same Class at net asset value unless
                    the shareholder elects to receive cash. Shares acquired by dividend and distribution reinvestment will not be
                    subject to any sales charge or CDSC (see pages 27 and 31).
- ------------------------------------------------------------------------------------------------------------------------------------
Redemption          Shares are redeemable by the shareholder at net asset value less any applicable CDSC on Class A, Class B or
                    Class C shares. An account may be involuntarily redeemed if the total value of the account is less than $100 or,
                    if the account was opened through EasyInvest-SM-, if after twelve months the shareholder has invested less than
                    $1,000 in the account (see page 30).
- ------------------------------------------------------------------------------------------------------------------------------------
Risks               The Fund invests only in obligations issued or guaranteed by the U.S. Government which are subject to minimal
                    risk of loss of income and principal. It may engage in the purchase of such securities on a when-issued basis.
                    The value of the Fund's portfolio securities, and therefore the Fund's net asset value per share, may increase
                    or decrease due to various factors, principally changes in prevailing interest rates. Generally, a rise in
                    interest rates will result in a decrease in the Fund's net asset value per share, while a drop in interest rates
                    will result in an increase in the Fund's net asset value per share. In addition, the average life of certain of
                    the securities held in the Fund's portfolio (i.e., GNMA Certificates) may be shortened by prepayments or
                    refinancings of the mortgage pools underlying such securities. Such prepayments may have an impact on dividends
                    paid by the Fund (see pages 13-15).
</TABLE>
    
 
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  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
         ELSEWHERE IN THE PROSPECTUS AND IN THE STATEMENT OF ADDITIONAL
                                  INFORMATION.
 
                                       3
<PAGE>
SUMMARY OF FUND EXPENSES
- --------------------------------------------------------------------------------
 
   
    The following table illustrates all expenses and fees that a shareholder of
the Fund will incur. The expenses and fees set forth in the table are based on
the expenses and fees for the fiscal year ended December 31, 1997.
    
 
   
<TABLE>
<CAPTION>
                                                                                   CLASS A    CLASS B    CLASS C    CLASS D
                                                                                  ---------   -------   ---------   -------
<S>                                                                               <C>         <C>       <C>         <C>
SHAREHOLDER TRANSACTION EXPENSES
- --------------------------------------------------------------------------------
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price)...   4.25%(1)    None      None        None
Sales Charge Imposed on Dividend Reinvestments..................................   None        None      None        None
Maximum Contingent Deferred Sales Charge (as a percentage of original purchase
  price or redemption proceeds).................................................   None(2)     5.00%(3)  1.00%(4)    None
Redemption Fees.................................................................   None        None      None        None
Exchange Fee....................................................................   None        None      None        None
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
- --------------------------------------------------------------------------------
Management Fees.................................................................   0.42%       0.43%     0.42%       0.42%
12b-1 Fees (5) (6)..............................................................   0.25%       0.75%     0.75%       None
Other Expenses..................................................................   0.08%       0.08%     0.08%       0.08%
Total Fund Operating Expenses (7)...............................................   0.75%       1.26%     1.25%       0.50%
</TABLE>
    
 
- ------------
(1) REDUCED FOR PURCHASES OF $25,000 AND OVER (SEE "PURCHASE OF FUND
    SHARES--INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES").
 
(2) INVESTMENTS THAT ARE NOT SUBJECT TO ANY SALES CHARGE AT THE TIME OF PURCHASE
    ARE SUBJECT TO A CDSC OF 1.00% THAT WILL BE IMPOSED ON REDEMPTIONS MADE
    WITHIN ONE YEAR AFTER PURCHASE, EXCEPT FOR CERTAIN SPECIFIC CIRCUMSTANCES
    (SEE "PURCHASE OF FUND SHARES--INITIAL SALES CHARGE ALTERNATIVE--CLASS A
    SHARES").
 
(3) THE CDSC IS SCALED DOWN TO 1.00% DURING THE SIXTH YEAR, REACHING ZERO
    THEREAFTER.
 
(4) ONLY APPLICABLE TO REDEMPTIONS MADE WITHIN ONE YEAR AFTER PURCHASE (SEE
    "PURCHASE OF FUND SHARES-- LEVEL LOAD ALTERNATIVE--CLASS C SHARES").
 
(5) THE 12b-1 FEE IS ACCRUED DAILY AND PAYABLE MONTHLY. THE ENTIRE 12b-1 FEE
    PAYABLE BY CLASS A AND A PORTION OF THE 12b-1 FEE PAYABLE BY EACH OF CLASS B
    AND CLASS C EQUAL TO 0.20% OF THE AVERAGE DAILY NET ASSETS OF CLASS B AND
    0.25% OF THE AVERAGE DAILY NET ASSETS OF CLASS C ARE CURRENTLY EACH
    CHARACTERIZED AS A SERVICE FEE WITHIN THE MEANING OF NATIONAL ASSOCIATION OF
    SECURITIES DEALERS, INC. ("NASD") GUIDELINES AND ARE PAYMENTS MADE FOR
    PERSONAL SERVICE AND/OR MAINTENANCE OF SHAREHOLDER ACCOUNTS. THE REMAINDER
    OF THE 12b-1 FEE, IF ANY, IS AN ASSET-BASED SALES CHARGE, AND IS A
    DISTRIBUTION FEE PAID TO THE DISTRIBUTOR TO COMPENSATE IT FOR THE SERVICES
    PROVIDED AND THE EXPENSES BORNE BY THE DISTRIBUTOR AND OTHERS IN THE
    DISTRIBUTION OF THE FUND'S SHARES (SEE "PURCHASE OF FUND SHARES--PLAN OF
    DISTRIBUTION").
 
(6) UPON CONVERSION OF CLASS B SHARES TO CLASS A SHARES, SUCH SHARES WILL BE
    SUBJECT TO THE LOWER 12b-1 FEE APPLICABLE TO CLASS A SHARES. NO SALES CHARGE
    IS IMPOSED AT THE TIME OF CONVERSION OF CLASS B SHARES TO CLASS A SHARES.
    CLASS C SHARES DO NOT HAVE A CONVERSION FEATURE AND, THEREFORE, ARE SUBJECT
    TO AN ONGOING 0.75% DISTRIBUTION FEE (SEE "PURCHASE OF FUND
    SHARES--ALTERNATIVE PURCHASE ARRANGEMENTS").
 
   
(7) THERE WERE NO OUTSTANDING SHARES OF CLASS A, CLASS C OR CLASS D PRIOR TO
    JULY 28, 1997. ACCORDINGLY, "TOTAL FUND OPERATING EXPENSES," AS SHOWN ABOVE
    WITH RESPECT TO THOSE CLASSES, ARE ESTIMATES BASED UPON THE SUM OF 12b-1
    FEES, MANAGEMENT FEES AND ESTIMATED "OTHER EXPENSES."
    
 
                                       4
<PAGE>
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<TABLE>
<CAPTION>
EXAMPLES                                            1 Year   3 Years   5 Years   10 Years
- --------------------------------------------------  ------   -------   -------   --------
<S>                                                 <C>      <C>       <C>       <C>
You would pay the following expenses on a $1,000
 investment assuming (1) a 5% annual return and
 (2) redemption at the end of each time period:
    Class A.......................................   $50       $65       $82       $132
    Class B.......................................   $63       $70       $89       $152
    Class C.......................................   $23       $40       $69       $151
    Class D.......................................   $ 5       $16       $28       $ 63
 
You would pay the following expenses on the same
 $1,000 investment assuming no redemption at the
 end of the period:
    Class A.......................................   $50       $65       $82       $132
    Class B.......................................   $13       $40       $69       $152
    Class C.......................................   $13       $40       $69       $151
    Class D.......................................   $ 5       $16       $28       $ 63
</TABLE>
    
 
    THE ABOVE EXAMPLES SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR
FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF EACH CLASS MAY BE GREATER OR
LESS THAN THOSE SHOWN.
 
    The purpose of this table is to assist the investor in understanding the
various costs and expenses that an investor in the Fund will bear directly or
indirectly. For a more complete description of these costs and expenses, see
"The Fund and its Management," "Purchase of Fund Shares--Plan of Distribution"
and "Redemptions and Repurchases."
 
    Long-term shareholders of Class B and Class C may pay more in sales charges,
including distribution fees, than the economic equivalent of the maximum
front-end sales charges permitted by the NASD.
 
                                       5
<PAGE>
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
   
    The following ratios and per share data for a share of beneficial interest
outstanding throughout each period have been audited by Price Waterhouse LLP,
independent accountants. The financial highlights should be read in conjunction
with the financial statements, the notes thereto and the unqualified report of
independent accountants which are contained in the Statement of Additional
Information. Further information about the performance of the Fund is contained
in the Fund's Annual Report to Shareholders, which may be obtained without
charge upon request to the Fund.
    
 
   
    Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:
    
 
   
<TABLE>
<CAPTION>
                                                           FOR THE YEAR ENDED DECEMBER 31,
                          --------------------------------------------------------------------------------------------------
CLASS B SHARES             1997*      1996      1995      1994      1993      1992      1991      1990      1989      1988
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
<S>                       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING
 PERFORMANCE:
Net asset value,
 beginning of period..... $   8.92  $   9.21  $   8.41  $   9.31  $   9.30  $   9.52  $   9.37  $   9.51  $   9.42  $   9.75
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
Net investment income....     0.56      0.56      0.57      0.58      0.64      0.74      0.87      0.90      0.91      0.97
Net realized and
 unrealized gain
 (loss)..................     0.18     (0.29)     0.80     (0.90)     0.01     (0.22)     0.15     (0.14)     0.09     (0.33)
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
Total from investment
 operations..............     0.74      0.27      1.37     (0.32)     0.65      0.52      1.02      0.76      1.00      0.64
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
Less dividends from net
 investment income.......    (0.56)    (0.56)    (0.57)    (0.58)    (0.64)    (0.74)    (0.87)    (0.90)    (0.91)    (0.97)
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
Net asset value, end of
 period.................. $   9.10  $   8.92  $   9.21  $   8.41  $   9.31  $   9.30  $   9.52  $   9.37  $   9.51  $   9.42
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
TOTAL INVESTMENT
 RETURN+.................    8.56%     3.16%    16.74%   (3.51)%     7.13%     5.76%    11.43%     8.49%    11.10%     6.74%
RATIOS TO AVERAGE NET
 ASSETS:
Expenses.................    1.26%     1.25%     1.24%     1.22%     1.18%     1.20%     1.17%     1.23%     1.19%     1.21%
Net investment income....    6.22%     6.28%     6.44%     6.57%     6.78%     7.91%     9.23%     9.60%     9.62%    10.01%
SUPPLEMENTAL DATA:
Net assets, end of
 period, in millions.....   $5,429    $6,450    $7,955    $8,211   $12,235   $12,484   $11,736    $9,829   $10,167   $10,366
Portfolio turnover
 rate....................       4%        8%       14%       26%       32%       40%      104%       54%       44%       15%
</TABLE>
    
 
- -------------
   
* PRIOR TO JULY 28, 1997, THE FUND ISSUED ONE CLASS OF SHARES. ALL SHARES OF THE
  FUND HELD PRIOR TO THAT DATE, OTHER THAN SHARES HELD BY CERTAIN EMPLOYEE
  BENEFIT PLANS ESTABLISHED BY DEAN WITTER REYNOLDS INC. AND ITS AFFILIATE, SPS
  TRANSACTION SERVICES, INC., HAVE BEEN DESIGNATED CLASS B SHARES. SHARES HELD
  BY THOSE EMPLOYEE BENEFIT PLANS PRIOR TO JULY 28, 1997 HAVE BEEN DESIGNATED
  CLASS D SHARES.
    
   
+ DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
  ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
    
 
                                       6
<PAGE>
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<TABLE>
<CAPTION>
                                                                         FOR THE PERIOD
                                                                         JULY 28, 1997*
                                                                            THROUGH
                                                                          DECEMBER 31,
                                                                              1997
<S>                                                                     <C>
CLASS A SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................      $  9.03
                                                                             ------
Net investment income.................................................         0.25
Net realized and unrealized gain......................................         0.06
                                                                             ------
Total from investment operations......................................         0.31
                                                                             ------
Less dividends from net investment income.............................        (0.25)
                                                                             ------
Net asset value, end of period........................................      $  9.09
                                                                             ------
                                                                             ------
TOTAL INVESTMENT RETURN+..............................................         3.50%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         0.77%(2)
Net investment income.................................................         6.57%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...............................      $20,841
Portfolio turnover rate...............................................            4%
</TABLE>
    
 
   
<TABLE>
<S>                                                                     <C>
CLASS C SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................      $  9.03
                                                                             ------
Net investment income.................................................         0.23
Net realized and unrealized gain......................................         0.14
                                                                             ------
Total from investment operations......................................         0.37
                                                                             ------
Less dividends from net investment income.............................        (0.23)
                                                                             ------
Net asset value, end of period........................................      $  9.17
                                                                             ------
                                                                             ------
TOTAL INVESTMENT RETURN+..............................................         4.14%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         1.25%(2)
Net investment income.................................................         5.81%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...............................       $4,385
Portfolio turnover rate...............................................            4%
</TABLE>
    
 
- -------------
   
 * THE DATE SHARES WERE ISSUED.
    
   
 + DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
   ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
    
   
(1) NOT ANNUALIZED.
    
   
(2) ANNUALIZED.
    
 
                                       7
<PAGE>
- --------------------------------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                         FOR THE PERIOD
                                                                         JULY 28, 1997*
                                                                            THROUGH
                                                                          DECEMBER 31,
                                                                              1997
<S>                                                                     <C>
CLASS D SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................      $  9.03
                                                                             ------
Net investment income.................................................         0.27
Net realized and unrealized gain......................................         0.08
                                                                             ------
Total from investment operations......................................         0.35
                                                                             ------
Less dividends from net investment income.............................        (0.27)
                                                                             ------
Net asset value, end of period........................................      $  9.11
                                                                             ------
                                                                             ------
TOTAL INVESTMENT RETURN+..............................................         3.87%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         0.52%(2)
Net investment income.................................................         6.91%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...............................      $11,367
Portfolio turnover rate...............................................            4%
</TABLE>
    
 
- -------------
   
 * THE DATE SHARES WERE FIRST ISSUED. SHAREHOLDERS WHO HELD SHARES OF THE FUND
   PRIOR TO JULY 28, 1997 (THE DATE THE FUND CONVERTED TO A MULTIPLE CLASS SHARE
   STRUCTURE) SHOULD REFER TO THE FINANCIAL HIGHLIGHTS OF CLASS B TO OBTAIN THE
   HISTORICAL PER SHARE DATA AND RATIO INFORMATION OF THEIR SHARES.
    
   
 + CALCULATED BASED ON THE NET ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE
   PERIOD.
    
   
(1) NOT ANNUALIZED.
    
   
(2) ANNUALIZED.
    
 
                                       8
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
    Dean Witter U.S. Government Securities Trust (the "Fund") is an open-end
diversified management investment company registered under the Investment
Company Act of 1940, as amended (the "Act"). The Fund is a Trust of the type
commonly known as a "Massachusetts business trust" and was organized under the
laws of The Commonwealth of Massachusetts on September 29, 1983.
 
   
    Dean Witter InterCapital Inc. ("InterCapital" or the "Investment Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
Investment Manager. The Investment Manager, which was incorporated in July,
1992, is a wholly-owned subsidiary of Morgan Stanley Dean Witter & Co., a
preeminent global financial services firm that maintains leading market
positions in each of its three primary businesses--securities, asset management
and credit services.
    
 
   
    InterCapital and its wholly-owned subsidiary, Dean Witter Services Company
Inc., serve in various investment management, advisory, management and
administrative capacities to 101 investment companies, twenty-eight of which are
listed on the New York Stock Exchange, with combined total assets of
approximately $113 billion at March 31, 1998. The Investment Manager also
manages portfolios of pension plans, other institutions and individuals which
aggregated approximately $4 billion at such date.
    
 
    The Fund has retained the Investment Manager to provide administrative
services, manage its business affairs and manage the investment of the Fund's
assets, including the placing of orders for the purchase and sale of portfolio
securities. InterCapital has retained Dean Witter Services Company Inc. to
perform the aforementioned administrative services for the Fund.
 
    The Fund's Trustees review the various services provided by or under the
direction of the Investment Manager to ensure that the Fund's general investment
policies and programs are being properly carried out and that administrative
services are being provided to the Fund in a satisfactory manner.
 
   
    As full compensation for the services and facilities furnished to the Fund
and expenses of the Fund assumed by the Investment Manager, the Fund pays the
Investment Manager monthly compensation calculated daily at an annual rate of
0.50% of the daily net assets of the Fund up to $1 billion, scaled down at
various asset levels to 0.30% on assets over $12.5 billion. For the fiscal year
ended December 31, 1997, the Fund accrued total compensation to the Investment
Manager amounting to 0.43% of the Fund's average daily net assets and the Fund's
total expenses of Class B amounted to 1.26% of the Fund's average daily net
assets of Class B. Shares of Class A, Class C and Class D were first issued on
July 28, 1997. The expenses of the Fund include: the fee of the Investment
Manager; the fee pursuant to the Plan of Distribution (see "Purchase of Fund
Shares"); taxes; transfer agent, custodian and auditing fees; certain legal
fees; and printing and other expenses relating to the Fund's operations which
are not expressly assumed by the Investment Manager under its Investment
Management Agreement with the Fund.
    
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
    The investment objective of the Fund is high current income consistent with
safety of principal. This investment objective may not be changed without
approval of the Fund's shareholders. The Fund seeks to achieve its objective by
investing in obligations issued or guaranteed by the U.S. Government or its
instrumentalities ("U.S. Government securities"). All such obligations are
backed by the
 
                                       9
<PAGE>
"full faith and credit" of the United States. Investments may be made in
obligations of instrumentalities of the U.S. Government only where such
obligations are guaranteed by the U.S. Government.
 
    U.S. Government securities include U.S. Treasury securities consisting of
Treasury bills, Treasury notes and Treasury bonds. Some of the other U.S.
Government securities in which the Fund may invest include securities of the
Federal Housing Administration, the Government National Mortgage Association,
the Department of Housing and Urban Development, the Export-Import Bank, the
Farmers Home Administration, the General Services Administration, the Maritime
Administration, Resolution Funding Corporation and the Small Business
Administration. The maturities of such securities usually range from three
months to thirty years.
 
    The Fund is not limited as to the maturities of the U.S. Government
securities in which it may invest, except that the Fund will not purchase zero
coupon securities with remaining maturities of longer than ten years. For a
discussion of the risks of investing in U.S. Government securities (including
such securities purchased on a when-issued, delayed delivery or firm commitment
basis and zero coupon securities), see "Risk Considerations" below.
 
    While the Fund has the ability to invest in any securities backed by the
full faith and credit of the United States, it is currently anticipated that a
substantial portion of the Fund's assets will be invested in Certificates of the
Government National Mortgage Association (GNMA). Should market or economic
conditions warrant, this policy is subject to change at any time at the
discretion of the Investment Manager.
 
    DESCRIPTION OF GNMA CERTIFICATES  GNMA Certificates are mortgage-backed
securities. Each Certificate evidences an interest in a specific pool of
mortgages insured by the Federal Housing Administration or the Farmers Home
Administration (FHA) or guaranteed by the Veterans Administration (VA).
Scheduled payments of principal and interest are made to the registered holders
of GNMA Certificates. The GNMA Certificates that the Fund will invest in are of
the modified pass-through type. GNMA guarantees the timely payment of monthly
installments of principal and interest on modified pass-through certificates at
the time such payments are due, whether or not such amounts are collected by the
issuer on the underlying mortgages. The National Housing Act provides that the
full faith and credit of the United States is pledged to the timely payment of
principal and interest by GNMA of amounts due on these GNMA Certificates.
 
    The average life of GNMA Certificates varies with the maturities of the
underlying mortgage instruments with maximum maturities of 30 years. The average
life is likely to be substantially less than the original maturity of the
mortgage pools underlying the securities as the result of prepayments or
refinancing of such mortgages or foreclosure. Such prepayments are passed
through to the registered holder with the regular monthly payments of principal
and interest, which has the effect of reducing future payments. Due to the GNMA
guarantee, foreclosures impose no risk to investment principal. The occurrence
of mortgage prepayments is affected by factors including the level of interest
rates, general economic conditions, the location and age of the mortgage and
other social and demographic conditions. As prepayment rates vary widely, it is
not possible to accurately predict the average life of a particular pool.
However, statistics indicate that the average life of the type of mortgages
backing the majority of GNMA Certificates is approximately twelve years. For
this reason, it is standard practice to treat GNMA Certificates as 30-year
mortgage-backed securities which prepay fully in the twelfth year. Pools of
mortgages with other maturities or different characteristics will have varying
assumptions for average life. The assumed average life of pools of mortgages
having terms of less than 30 years is less than twelve years, but typically not
less than five years.
 
    The coupon rate of interest of GNMA Certificates is lower than the interest
rate paid on the
 
                                       10
<PAGE>
VA-guaranteed or FHA-insured mortgages underlying the Certificates, but only by
the amount of the fees paid to GNMA and the issuer.
 
    Yields on pass-through securities are typically quoted by investment dealers
and vendors based on the maturity of the underlying instruments and the
associated average life assumption. In periods of falling interest rates the
rate of prepayment tends to increase, thereby shortening the actual average life
of a pool of mortgage-related securities. Conversely, in periods of rising rates
the rate of prepayment tends to decrease, thereby lengthening the actual average
life of the pool. Reinvestment by the Fund of prepayments may occur at higher or
lower interest rates than the original investment. Historically, actual average
life has been consistent with the twelve-year assumption referred to above. The
actual yield of each GNMA Certificate is influenced by the prepayment experience
of the mortgage pool underlying the Certificates. Interest on GNMA Certificates
is paid monthly rather than semi-annually as for traditional bonds.
 
    The Fund will invest in mortgage pass-through securities representing
participation interests in pools of residential mortgage loans originated by
United States governmental or private lenders such as banks, broker-dealers and
financing corporations and guaranteed, to the extent provided in such
securities, by the United States Government or one of its agencies or
instrumentalities. Such securities, which are ownership interests in the
underlying mortgage loans, differ from conventional debt securities, which
provide for periodic payment of interest in fixed amounts (usually
semi-annually) and principal payments at maturity or on specified call dates.
Mortgage pass-through securities provide for monthly payments that are a
"pass-through" of the monthly interest and principal payments (including any
prepayments) made by the individual borrowers on the pooled mortgage loans, net
of any fees paid to the guarantor of such securities and the servicer of the
underlying mortgage loans. The guaranteed mortgage pass-through securities in
which the Fund may invest include those issued or guaranteed by GNMA or other
entities which securities are backed by the full faith and credit of the United
States.
 
    Certificates for mortgage-backed securities evidence an interest in a
specific pool of mortgages. These certificates are, in most cases, "modified
pass-through" instruments, wherein the issuing agency guarantees the payment of
principal and interest on mortgages underlying the certificates, whether or not
such amounts are collected by the issuer on the underlying mortgages.
 
    ADJUSTABLE RATE MORTGAGE SECURITIES.  The Fund may also invest in adjustable
rate mortgage securities ("ARMs"), which are pass-through mortgage securities
collateralized by mortgages with adjustable rather than fixed rates. ARMs
eligible for inclusion in a mortgage pool generally provide for a fixed initial
mortgage interest rate for either the first three, six, twelve or thirteen
scheduled monthly payments. Thereafter, the interest rates are subject to
periodic adjustment based on changes to a designated benchmark index.
 
    ARMs contain maximum and minimum rates beyond which the mortgage interest
rate may not vary over the lifetime of the security. In addition, certain ARMs
provide for additional limitations on the maximum amount by which the mortgage
interest rate may adjust for any single adjustment period. Alternatively,
certain ARMs contain limitations on changes in the required monthly payment. In
the event that a monthly payment is not sufficient to pay the interest accruing
on an ARM, any such excess interest is added to the principal balance of the
mortgage loan, which is repaid through future monthly payments. If the monthly
payment for such an instrument exceeds the sum of the interest accrued at the
applicable mortgage interest rate and the principal payment required at such
point to amortize the outstanding principal balance over the remaining term of
the loan, the excess is utilized to reduce the then outstanding principal
balance of the ARM.
 
                                       11
<PAGE>
    COLLATERALIZED MORTGAGE OBLIGATIONS AND MULTICLASS PASS-THROUGH
SECURITIES.  Collateralized mortgage obligations or "CMOs" are debt obligations
collateralized by mortgage loans or mortgage pass-through securities. Typically,
CMOs are collateralized by GNMA, FNMA or FHLMC Certificates, but also may be
collateralized by whole loans or private mortgage pass-through securities (such
collateral collectively hereinafter referred to as "Mortgage Assets").
Multiclass pass-through securities are equity interests in a trust composed of
Mortgage Assets. Payments of principal of and interest on the Mortgage Assets,
and any reinvestment income thereon, provide the funds to pay debt service on
the CMOs or make scheduled distributions on the multiclass pass-through
securities. CMOs may be issued by agencies or instrumentalities of the United
States government, or by private originators of, or investors in, mortgage
loans, including savings and loan associations, mortgage banks, commercial
banks, investment banks and special purpose subsidiaries of the foregoing.
However, the Fund will only invest in CMOs which are backed by the full faith
and credit of the United States.
 
    The issuer of a series of CMOs may elect to be treated as a Real Estate
Mortgage Investment Conduit ("REMIC"). REMICs include governmental and/or
private entities that issue a fixed pool of mortgages secured by an interest in
real property. REMICs are similar to CMOs in that they issue multiple classes of
securities, but unlike CMOs, which are required to be structured as debt
securities, REMICs may be structured as indirect ownership interests in the
underlying assets of the REMICs themselves. However, there are no effects on the
Fund from investing in CMOs issued by entities that have elected to be treated
as REMICs, and all future references to CMOs shall also be deemed to include
REMICs. The Fund may invest without limitation in CMOs.
 
    In a CMO, a series of bonds or certificates is issued in multiple classes.
Each class of CMOs, often referred to as a "tranche," is issued at a specific
fixed or floating coupon rate and has a stated maturity or final distribution
date. Principal prepayments on the Mortgage Assets may cause the CMOs to be
retired substantially earlier than their stated maturities or final distribution
dates. Interest is paid or accrues on all classes of the CMOs on a monthly,
quarterly or semi-annual basis. Certain CMOs may have variable or floating
interest rates and others may be stripped (securities which provide only the
principal or interest feature of the underlying security).
 
    The principal of and interest on the Mortgage Assets may be allocated among
the several classes of a CMO series in a number of different ways. Generally,
the purpose of the allocation of the cash flow of a CMO to the various classes
is to obtain a more predictable cash flow to the individual tranches than exists
with the underlying collateral of the CMO. As a general rule, the more
predictable the cash flow is on a CMO tranche, the lower the anticipated yield
will be on that tranche at the time of issuance relative to prevailing market
yields on mortgage-backed securities. As part of the process of creating more
predictable cash flows on most of the tranches in a series of CMOs, one or more
tranches generally must be created that absorb most of the volatility in the
cash flows on the underlying mortgage loans. The yields on these tranches are
generally higher than prevailing market yields on mortgage-backed securities
with similar maturities. As a result of the uncertainty of the cash flows of
these tranches, the market prices of and yield on these tranches generally are
more volatile.
 
    The Fund also may invest in, among other things, parallel pay CMOs and
Planned Amortization Class CMOs ("PAC Bonds"). Parallel pay CMOs are structured
to provide payments of principal on each payment date to more than one class.
These simultaneous payments are taken into account in calculating the stated
maturity date or final distribution date of each class, which, as with other CMO
structures, must be retired by its stated maturity date or final distribution
date but may be retired earlier. PAC Bonds generally require payments of a
specified amount of principal on each payment
 
                                       12
<PAGE>
date. PAC Bonds always are parallel pay CMOs with the required principal payment
on such securities having the highest priority after interest has been paid to
all classes.
 
    For a discussion of the risks of investing in mortgage-backed securities,
see "Risk Considerations" below.
 
    The purchase or retention of stripped mortgage-backed securities, CMOs and
REMICs investments will be made only in conformity with the provisions of
Section 703.5 of the National Credit Union Administration Rules and Regulations,
as such provisions became effective on December 2, 1991.
 
RISK CONSIDERATIONS
 
    The net asset value of the Fund's shares will fluctuate with changes in the
market value of its portfolio securities. Neither the value nor the yield of the
U.S. Government securities invested in by the Fund (or the value or yield of the
shares of the Fund) is guaranteed by the U.S. Government. Such values and yield
will fluctuate with changes in prevailing interest rates and other factors.
 
    Generally, as prevailing interest rates rise, the value of the U.S.
Government securities held by the Fund, and, concomitantly, the net asset value
of the Fund's shares, will fall. Such securities with longer maturities
generally tend to produce higher yields and are subject to greater market
fluctuation as a result of changes in interest rates than debt securities with
shorter maturities. As noted above, except with regard to zero coupon
securities, the Fund is not limited as to the maturities of the U.S. Government
securities in which it may invest.
 
    RISKS OF MORTGAGE-BACKED SECURITIES.  Mortgage-backed securities have
certain different characteristics than traditional debt securities. Among the
major differences are that interest and principal payments are made more
frequently, usually monthly, and that principal may be prepaid at any time
because the underlying mortgage loans or other assets generally may be prepaid
at any time. As a result, if the Fund purchases such a security at a premium, a
prepayment rate that is faster than expected may reduce yield to maturity, while
a pre-payment rate that is slower than expected may have the opposite effect of
increasing yield to maturity. Alternatively, if the Fund purchases these
securities at a discount, faster than expected prepayments will increase, while
slower than expected prepayments may reduce, yield to maturity.
 
    Mortgage-backed securities, like all fixed-income securities, generally
decrease in value as a result of increases in interest rates. In addition,
although generally the value of fixed-income securities increases during periods
of falling interest rates, mortgage-backed securities may benefit less than
other fixed-income securities from declining interest rates because of the risk
of prepayments. As discussed above under "Description of GNMA Certificates," the
assumed average life of mortgages backing the majority of GNMA Certificates is
twelve years. This average life is likely to be substantially shorter than the
original maturity of the mortgage pools underlying the certificates, as a pool's
duration may be shortened by unscheduled or early payments of principal on the
underlying mortgages. As prepayment rates vary widely, it is not possible to
accurately predict the average life of a particular pool.
 
    Although the extent of prepayments on a pool of mortgage loans depends on
various factors, including the prevailing level of interest rates, general
economic conditions, the location and age of the mortgage and other social and
demographic conditions, as a general rule prepayments on fixed rate mortgage
loans will increase during a period of falling interest rates and decrease
during a period of rising interest rates. If the Fund has purchased securities
backed by pools containing mortgages whose yields exceed the prevailing interest
rate, any premium paid for such securities may be lost. As a result, the net
asset value of shares of the Fund and the Fund's ability to achieve its
investment objective
 
                                       13
<PAGE>
may be adversely affected by mortgage prepayments. Amounts available for
reinvestment by the Fund are likely to be greater during a period of declining
interest rates and, as a result, likely to be reinvested at lower interest rates
than during a period of rising interest rates.
 
    There are certain risks associated specifically with CMOs. A number of
different factors, including the extent of prepayment of principal of the
Mortgage Assets, affect the availability of cash for principal payments by the
CMO issuer on any payment date and, accordingly, affect the timing of principal
payments on each CMO class.
 
   
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS  From
time to time, in the ordinary course of business, the Fund may purchase
securities on a when-issued or delayed delivery basis or may purchase or sell
securities on a forward commitment basis. When such transactions are negotiated,
the price is fixed at the time of the commitment, but delivery and payment can
take place between one month and 120 days after the date of the commitment.
While the Fund will only purchase securities on a when-issued, delayed delivery
or forward commitment basis with the intention of acquiring the securities, the
Fund may sell the securities before the settlement date, if it is deemed
advisable. The securities so purchased or sold are subject to market fluctuation
and no interest accrues to the purchaser during this period. At the time the
Fund makes the commitment to purchase or sell securities on a when-issued,
delayed delivery or forward commitment basis, it will record the transaction and
thereafter reflect the value, each day, of such security purchased or, if a
sale, the proceeds to be received, in determining its net asset value. At the
time of delivery of the securities, their value may be more or less than the
purchase or sale price. The Fund will also establish a segregated account with
its custodian bank in which it will continually maintain cash or cash
equivalents or other liquid portfolio securities equal in value to commitments
to purchase securities on a when-issued, delayed delivery or forward commitment
basis. There is no overall limit on the percentage of the Fund's assets which
may be committed to the purchase of securities on a when-issued, delayed
delivery or forward commitment basis. An increase in the percentage of the
Fund's assets committed to the purchase of securities on a when-issued, delayed
delivery or forward commitment basis may increase the volatility of the Fund's
net asset value.
    
 
    ZERO COUPON SECURITIES.  A portion of the U.S. Government securities
purchased by the Fund may be zero coupon securities with maturity dates in each
case no later than ten years from the settlement date for the purchase of such
security. Such securities are purchased at a discount from their face amount,
giving the purchaser the right to receive their full value at maturity. The
interest earned on such securities is, implicitly, automatically compounded and
paid out at maturity. While such compounding at a constant rate eliminates the
risk of receiving lower yields upon reinvestment of interest if prevailing
interest rates decline, the owner of a zero coupon security will be unable to
participate in higher yields upon reinvestment of interest received on
interest-paying securities if prevailing interest rates rise.
 
    A zero coupon security pays no interest to its holder during its life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive current cash available for distribution to shareholders. In addition,
zero coupon securities are subject to substantially greater price fluctuations
during periods of changing prevailing interest rates than are comparable
securities which pay interest on a current basis. Current federal tax law
requires that a holder (such as the Fund) of a zero coupon security accrue a
portion of the discount at which the security was purchased as income each year
even though the Fund receives no interest payments in cash on the security
during the year.
 
   
    YEAR 2000.  The investment management services provided to the Fund by the
Investment Manager and the services provided to shareholders by
    
 
                                       14
<PAGE>
   
the Distributor and the Transfer Agent depend on the smooth functioning of their
computer systems. Many computer software systems in use today cannot recognize
the year 2000, but revert to 1900 or some other date, due to the manner in which
dates were encoded and calculated. That failure could have a negative impact on
the handling of securities trades, pricing and account services. The Investment
Manager, the Distributor and the Transfer Agent have been actively working on
necessary changes to their own computer systems to prepare for the year 2000 and
expect that their systems will be adapted before that date, but there can be no
assurance that they will be successful, or that interaction with other
non-complying computer systems will not impair their services at that time.
    
 
   
    In addition, it is possible that the markets for securities in which the
Fund invests may be detrimentally affected by computer failures throughout the
financial services industry beginning January 1, 2000. Improperly functioning
trading systems may result in settlement problems and liquidity issues. In
addition, corporate and governmental data processing errors may result in
production problems for individual companies and overall economic uncertainties.
Earnings of individual issuers will be affected by remediation costs, which may
be substantial. Accordingly, The Fund's investments may be adversely affected.
    
 
    For additional risk disclosure, please refer to the discussion of specific
investments above in "Investment Objective and Policies."
 
                              -------------------
 
    Notwithstanding any other investment policy or restriction, the Fund may
seek to achieve its investment objective by investing all or substantially all
of its assets in another investment company having substantially the same
investment objectives and policies as the Fund.
 
PORTFOLIO TRADING
 
   
    The Fund is managed within InterCapital's Taxable Fixed-Income Group, which
manages 23 funds and fund portfolios, with approximately $13.7 billion in assets
at March 31, 1998. Rajesh K. Gupta, Senior Vice President of InterCapital and a
member of InterCapital's Taxable Fixed-Income Group, has been the primary
portfolio manager of the Fund and has been managing portfolios comprised of
government securities at InterCapital for over five years.
    
 
   
    Although the Fund does not intend to engage in short-term trading of
portfolio securities as a means of achieving its investment objective, it may
sell portfolio securities without regard to the length of time they have been
held whenever such sale will in the Investment Manager's opinion strengthen the
Fund's position and contribute to its investment objective. The portfolio
trading engaged in by the Fund may result in its portfolio turnover rate
exceeding 100%. Brokerage commissions are not normally charged on the purchase
or sale of U.S. Government obligations, but such transactions may involve costs
in the form of spreads between bid and asked prices. Pursuant to an order of the
Securities and Exchange Commission, the Fund may effect principal transactions
in certain money market instruments with Dean Witter Reynolds Inc. ("DWR"), a
broker-dealer affiliate of InterCapital. In addition, the Fund may incur
brokerage commissions on transactions conducted through DWR, Morgan Stanley and
Co. Inc. and other brokers and dealers that are affiliates of InterCapital.
    
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
GENERAL
 
    The Fund offers each Class of its shares for sale to the public on a
continuous basis. Pursuant to a Distribution Agreement between the Fund and Dean
Witter Distributors Inc. (the "Distributor"), an affiliate of the Investment
Manager, shares of the Fund are
 
                                       15
<PAGE>
distributed by the Distributor and offered by DWR and other dealers which have
entered into selected dealer agreements with the Distributor ("Selected
Broker-Dealers"). The principal executive office of the Distributor is located
at Two World Trade Center, New York, New York 10048.
 
   
    The Fund offers four classes of shares (each, a "Class"). Class A shares are
sold to investors with an initial sales charge that declines to zero for larger
purchases; however, Class A shares sold without an initial sales charge are
subject to a contingent deferred sales charge ("CDSC") of 1.0% if redeemed
within one year of purchase, except for certain specific circumstances. Class B
shares are sold without an initial sales charge but are subject to a CDSC
(scaled down from 5.0% to 1.0%) payable upon most redemptions within six years
after purchase. (Class B shares purchased by certain qualified plans are subject
to a CDSC scaled down from 2.0% to 1.0% if redeemed within three years after
purchase.) Class C shares are sold without an initial sales charge but are
subject to a CDSC of 1.0% on most redemptions made within one year after
purchase. Class D shares are sold without an initial sales charge or CDSC and
are available only to investors meeting an initial investment minimum of $5
million ($25 million for certain qualified plans), and to certain other limited
categories of investors. At the discretion of the Board of Trustees of the Fund,
Class A shares may be sold to categories of investors in addition to those set
forth in this prospectus at net asset value without a front-end sales charge,
and Class D shares may be sold to certain other categories of investors, in each
case as may be described in the then current prospectus of the Fund. See
"Alternative Purchase Arrangements-- Selecting a Particular Class" for a
discussion of factors to consider in selecting which Class of shares to
purchase.
    
 
   
    The minimum initial purchase is $1,000 for each Class of shares, although
Class D shares are only available to persons investing $5 million ($25 million
for certain qualified plans) or more and to certain other limited categories of
investors. For the purpose of meeting the minimum $5 million (or $25 million)
initial investment for Class D shares, and subject to the $1,000 minimum initial
investment for each Class of the Fund, an investor's existing holdings of Class
A shares of the Fund and other Dean Witter Funds that are multiple class funds
("Dean Witter Multi-Class Funds") and shares of Dean Witter Funds sold with a
front-end sales charge ("FSC Funds") and concurrent investments in Class D
shares of the Fund and other Dean Witter Multi-Class Funds will be aggregated.
Subsequent purchases of $100 or more may be made by sending a check, payable to
Dean Witter U.S. Government Securities Trust, directly to Morgan Stanley Dean
Witter Trust FSB (the "Transfer Agent" or "MSDW Trust") at P.O. Box 1040, Jersey
City, NJ 07303 or by contacting an account executive of DWR or other Selected
Broker-Dealer. When purchasing shares of the Fund, investors must specify
whether the purchase is for Class A, Class B, Class C or Class D shares. If no
Class is specified, the Transfer Agent will not process the transaction until
the proper Class is identified. The minimum initial purchase, in the case of
investments through EasyInvest, an automatic purchase plan (see "Shareholder
Services"), is $100, provided that the schedule of automatic investments will
result in investments totalling at least $1,000 within the first twelve months.
The minimum initial purchase in the case of an "Education IRA" is $500, if the
Distributor has reason to believe that additional investments will increase the
investment in the account to $1,000 within three years. In the case of
investments pursuant to (i) Systematic Payroll Deduction Plans (including
Individual Retirement Plans), (ii) the InterCapital mutual fund asset allocation
program and (iii) fee-based programs approved by the Distributor, pursuant to
which participants pay an asset based fee for services in the nature of
investment advisory, administrative and/or brokerage services, the Fund, in its
discretion, may accept investments without regard to any minimum amounts which
would otherwise be required, provided, in the case of Systematic Payroll
Deduction
    
 
                                       16
<PAGE>
   
Plans, that the Distributor has reason to believe that additional investments
will increase the investment in all accounts under such Plans to at least
$1,000. Certificates for shares purchased will not be issued unless requested by
the shareholder in writing to the Transfer Agent.
    
 
    Shares of the Fund are sold through the Distributor on a normal three
business day settlement basis; that is, payment generally is due on or before
the third business day (settlement date) after the order is placed with the
Distributor. Shares of the Fund purchased through the Distributor are entitled
to dividends beginning on the next business day following settlement date. Since
DWR and other Selected Broker-Dealers forward investors' funds on settlement
date, they will benefit from the temporary use of the funds where payment is
made prior thereto. Shares purchased through the Transfer Agent are entitled to
dividends beginning on the next business day following receipt of an order. As
noted above, orders placed directly with the Transfer Agent must be accompanied
by payment. Investors will be entitled to receive capital gains distributions if
their order is received by the close of business on the day prior to the record
date for such distributions. Sales personnel of a Selected Broker-Dealer are
compensated for selling shares of the Fund by the Distributor or any of its
affiliates and/or the Selected Broker-Dealer. In addition, some sales personnel
of the Selected Broker-Dealer will receive various types of non-cash
compensation as special sales incentives, including trips, educational and/or
business seminars and merchandise. The Fund and the Distributor reserve the
right to reject any purchase orders.
 
ALTERNATIVE PURCHASE ARRANGEMENTS
 
    The Fund offers several Classes of shares to investors designed to provide
them with the flexibility of selecting an investment best suited to their needs.
The general public is offered three Classes of shares: Class A shares, Class B
shares and Class C shares, which differ principally in terms of sales charges
and rate of expenses to which they are subject. A fourth Class of shares, Class
D shares, is offered only to limited categories of investors (see "No Load
Alternative--Class D Shares" below).
 
   
    Each Class A, Class B, Class C or Class D share of the Fund represents an
identical interest in the investment portfolio of the Fund except that Class A,
Class B and Class C shares bear the expenses of the ongoing shareholder service
fees, Class B and Class C shares bear the expenses of the ongoing distribution
fees and Class A, Class B and Class C shares which are redeemed subject to a
CDSC bear the expense of the additional incremental distribution costs resulting
from the CDSC applicable to shares of those Classes. The ongoing distribution
fees that are imposed on Class A, Class B and Class C shares will be imposed
directly against those Classes and not against all assets of the Fund and,
accordingly, such charges against one Class will not affect the net asset value
of any other Class or have any impact on investors choosing another sales charge
option. See "Plan of Distribution" and "Redemptions and Repurchases."
    
 
    Set forth below is a summary of the differences between the Classes and the
factors an investor should consider when selecting a particular Class. This
summary is qualified in its entirety by detailed discussion of each Class that
follows this summary.
 
    CLASS A SHARES.  Class A shares are sold at net asset value plus an initial
sales charge of up to 4.25%. The initial sales charge is reduced for certain
purchases. Investments of $1 million or more (and investments by certain other
limited categories of investors) are not subject to any sales charges at the
time of purchase but are subject to a CDSC of 1.0% on redemptions made within
one year after purchase, except for certain specific circumstances. Class A
shares are also subject to a 12b-1 fee of up to 0.25% of the average daily net
assets of the Class. See "Initial Sales Charge Alternative--Class A Shares."
 
    CLASS B SHARES.  Class B shares are offered at net asset value with no
initial sales charge but are subject to a CDSC (scaled down from 5.0% to 1.0%)
if redeemed within six years of purchase. (Class B
 
                                       17
<PAGE>
   
shares purchased by certain qualified plans are subject to a CDSC scaled down
from 2.0% to 1.0% if redeemed within three years after purchase.) This CDSC may
be waived for certain redemptions. Class B shares are also subject to an annual
12b-1 fee of 0.75% (0.65% on amounts over $10 billion) of the lesser of: (a) the
average daily aggregate gross sales of the Fund's Class B shares since the
inception of the Fund (not including reinvestments of dividends or capital gains
distributions), less the average daily aggregate net asset value of the Fund's
Class B shares redeemed since the Fund's inception upon which a CDSC has been
imposed or waived, or (b) the average daily net assets of Class B. The Class B
shares' distribution fee will cause that Class to have higher expenses and pay
lower dividends than Class A or Class D shares.
    
 
    After approximately ten (10) years, Class B shares will convert
automatically to Class A shares of the Fund, based on the relative net asset
values of the shares of the two Classes on the conversion date. In addition, a
certain portion of Class B shares that have been acquired through the
reinvestment of dividends and distributions will be converted at that time. See
"Contingent Deferred Sales Charge Alternative--Class B Shares."
 
    CLASS C SHARES.  Class C shares are sold at net asset value with no initial
sales charge but are subject to a CDSC of 1.0% on redemptions made within one
year after purchase. This CDSC may be waived for certain redemptions. They are
subject to an annual 12b-1 fee of up to 0.75% of the average daily net assets of
the Class C shares. The Class C shares' distribution fee may cause that Class to
have higher expenses and pay lower dividends than Class A or Class D shares. See
"Level Load Alternative--Class C Shares."
 
    CLASS D SHARES.  Class D shares are available only to limited categories of
investors (see "No Load Alternative--Class D Shares" below). Class D shares are
sold at net asset value with no initial sales charge or CDSC. They are not
subject to any 12b-1 fees. See "No Load Alternative--Class D Shares."
 
    SELECTING A PARTICULAR CLASS.  In deciding which Class of Fund shares to
purchase, investors should consider the following factors, as well as any other
relevant facts and circumstances:
 
    The decision as to which Class of shares is more beneficial to an investor
depends on the amount and intended length of his or her investment. Investors
who prefer an initial sales charge alternative may elect to purchase Class A
shares. Investors qualifying for significantly reduced or, in the case of
purchases of $1 million or more, no initial sales charges may find Class A
shares particularly attractive because similar sales charge reductions are not
available with respect to Class B or Class C shares. Moreover, Class A shares
are subject to lower ongoing expenses than are Class B or Class C shares over
the term of the investment. As an alternative, Class B and Class C shares are
sold without any initial sales charge so the entire purchase price is
immediately invested in the Fund. Any investment return on these additional
investment amounts may partially or wholly offset the higher annual expenses of
these Classes. Because the Fund's future return cannot be predicted, however,
there can be no assurance that this would be the case.
 
    Finally, investors should consider the effect of the CDSC period and any
conversion rights of the Classes in the context of their own investment time
frame. For example, although Class C shares are subject to a significantly lower
CDSC upon redemptions, they do not, unlike Class B shares, convert into Class A
shares after approximately ten years, and, therefore, are subject to an ongoing
12b-1 fee of 0.75% (rather than the 0.25% fee applicable to Class A shares) for
an indefinite period of time. Thus, Class B shares may be more attractive than
Class C shares to investors with longer term investment outlooks. Other
investors, however, may elect to purchase Class C shares if, for example, they
determine that they do not wish to be subject to a front-end sales charge and
they are uncertain as to the length of time they intend to hold their shares.
 
                                       18
<PAGE>
   
    For the purpose of meeting the $5 million (or $25 million) minimum
investment amount for Class D shares, holdings of Class A shares in all Dean
Witter Multi-Class Funds, shares of FSC Funds and shares of Dean Witter Funds
for which such shares have been exchanged will be included together with the
current investment amount.
    
 
    Sales personnel may receive different compensation for selling each Class of
shares. Investors should understand that the purpose of a CDSC is the same as
that of the initial sales charge in that the sales charges applicable to each
Class provide for the financing of the distribution of shares of that Class.
 
    Set forth below is a chart comparing the sales charge, 12b-1 fees and
conversion options applicable to each Class of shares:
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------
                                              CONVERSION
  CLASS       SALES CHARGE     12b-1 FEE       FEATURE
<C>        <S>                 <C>         <C>
- -----------------------------------------------------------
    A      Maximum 4.25%         0.25%            No
           initial sales
           charge reduced for
           purchases of
           $25,000 and over;
           shares sold
           without an initial
           sales charge
           generally subject
           to a 1.0% CDSC
           during first year.
- -----------------------------------------------------------
    B      Maximum 5.0% CDSC   0.75%       B shares convert
           during the first    (0.65% on   to A shares
           year decreasing to  amounts     automatically
           0 after six years   over $10    after
                               billion)    approximately
                                           ten years
- -----------------------------------------------------------
    C      1.0% CDSC during      0.75%            No
           first year
- -----------------------------------------------------------
    D             None            None            No
</TABLE>
 
    See "Purchase of Fund Shares" and "The Fund and its Management" for a
complete description of the sales charges and service and distribution fees for
each Class of shares and "Determination of Net Asset Value," "Dividends,
Distributions and Taxes" and "Shareholder Services--Exchange Privilege" for
other differences between the Classes of shares.
 
INITIAL SALES CHARGE ALTERNATIVE--
CLASS A SHARES
 
    Class A shares are sold at net asset value plus an initial sales charge. In
some cases, reduced sales charges may be available, as described below.
Investments of $1 million or more (and investments by certain other limited
categories of investors) are not subject to any sales charges at the time of
purchase but are subject to a CDSC of 1.0% on redemptions made within one year
after purchase (calculated from the last day of the month in which the shares
were purchased), except for certain specific circumstances. The CDSC will be
assessed on an amount equal to the lesser of the current market value or the
cost of the shares being redeemed. The CDSC will not be imposed (i) in the
circumstances set forth below in the section "Contingent Deferred Sales Charge
Alternative--Class B Shares--CDSC Waivers," except that the references to six
years in the first paragraph of that section shall mean one year in the case of
Class A shares, and (ii) in the circumstances identified in the section
"Additional Net Asset Value Purchase Options" below. Class A shares are also
subject to an annual 12b-1 fee of up to 0.25% of the average daily net assets of
the Class.
 
    The offering price of Class A shares will be the net asset value per share
next determined following receipt of an order (see "Determination of Net Asset
Value" below), plus a sales charge (expressed as a percentage of the offering
price) on a single transaction as shown in the following table:
 
<TABLE>
<CAPTION>
                                          SALES CHARGE
                           ------------------------------------------
                              PERCENTAGE OF          APPROXIMATE
        AMOUNT OF            PUBLIC OFFERING    PERCENTAGE OF AMOUNT
   SINGLE TRANSACTION             PRICE               INVESTED
- -------------------------  -------------------  ---------------------
<S>                        <C>                  <C>
Less than $25,000........           4.25%                 4.44%
$25,000 but less
     than $50,000........           4.00%                 4.17%
$50,000 but less
     than $100,000.......           3.50%                 3.63%
$100,000 but less
     than $250,000.......           2.75%                 2.83%
$250,000 but less
     than $1 million.....           1.75%                 1.78%
$1 million and over......              0                     0
</TABLE>
 
                                       19
<PAGE>
    Upon notice to all Selected Broker-Dealers, the Distributor may reallow up
to the full applicable sales charge as shown in the above schedule during
periods specified in such notice. During periods when 90% or more of the sales
charge is reallowed, such Selected Broker-Dealers may be deemed to be
underwriters as that term is defined in the Securities Act of 1933.
 
    The above schedule of sales charges is applicable to purchases in a single
transaction by, among others: (a) an individual; (b) an individual, his or her
spouse and their children under the age of 21 purchasing shares for his, her or
their own accounts; (c) a trustee or other fiduciary purchasing shares for a
single trust estate or a single fiduciary account; (d) a pension, profit-sharing
or other employee benefit plan qualified or non-qualified under Section 401 of
the Internal Revenue Code; (e) tax-exempt organizations enumerated in Section
501(c)(3) or (13) of the Internal Revenue Code; (f) employee benefit plans
qualified under Section 401 of the Internal Revenue Code of a single employer or
of employers who are "affiliated persons" of each other within the meaning of
Section 2(a)(3)(c) of the Act; and for investments in Individual Retirement
Accounts of employees of a single employer through Systematic Payroll Deduction
plans; or (g) any other organized group of persons, whether incorporated or not,
provided the organization has been in existence for at least six months and has
some purpose other than the purchase of redeemable securities of a registered
investment company at a discount.
 
    COMBINED PURCHASE PRIVILEGE.  Investors may have the benefit of reduced
sales charges in accordance with the above schedule by combining purchases of
Class A shares of the Fund in single transactions with the purchase of Class A
shares of other Dean Witter Multi-Class Funds and shares of FSC Funds. The sales
charge payable on the purchase of the Class A shares of the Fund, the Class A
shares of the other Dean Witter Multi-Class Funds and the shares of the FSC
Funds will be at their respective rates applicable to the total amount of the
combined concurrent purchases of such shares.
 
   
    RIGHT OF ACCUMULATION.  The above persons and entities may benefit from a
reduction of the sales charges in accordance with the above schedule if the
cumulative net asset value of Class A shares purchased in a single transaction,
together with shares of the Fund and other Dean Witter Funds previously
purchased at a price including a front-end sales charge (including shares of the
Fund and other Dean Witter Funds acquired in exchange for those shares, and
including in each case shares acquired through reinvestment of dividends and
distributions), which are held at the time of such transaction, amounts to
$25,000 or more. If such investor has a cumulative net asset value of shares of
FSC Funds and Class A and Class D shares that, together with the current
investment amount, is equal to at least $5 million ($25 million for certain
qualified plans), such investor is eligible to purchase Class D shares subject
to the $1,000 minimum initial investment requirement of that Class of the Fund.
See "No Load Alternative--Class D Shares" below.
    
 
    The Distributor must be notified by DWR or a Selected Broker-Dealer or the
shareholder at the time a purchase order is placed that the purchase qualifies
for the reduced charge under the Right of Accumulation. Similar notification
must be made in writing by the dealer or shareholder when such an order is
placed by mail. The reduced sales charge will not be granted if: (a) such
notification is not furnished at the time of the order; or (b) a review of the
records of the Selected Broker-Dealer or the Transfer Agent fails to confirm the
investor's represented holdings.
 
    LETTER OF INTENT.  The foregoing schedule of reduced sales charges will also
be available to investors who enter into a written Letter of Intent providing
for the purchase, within a thirteen-month period, of Class A shares of the Fund
from DWR or other Selected Broker-Dealers. The cost of Class A shares of the
Fund or shares of other Dean Witter Funds which were previously purchased at a
price
 
                                       20
<PAGE>
including a front-end sales charge during the 90-day period prior to the date of
receipt by the Distributor of the Letter of Intent, or of Class A shares of the
Fund or shares of other Dean Witter Funds acquired in exchange for shares of
such funds purchased during such period at a price including a front-end sales
charge, which are still owned by the shareholder, may also be included in
determining the applicable reduction.
 
    ADDITIONAL NET ASSET VALUE PURCHASE OPTIONS. In addition to investments of
$1 million or more, Class A shares also may be purchased at net asset value by
the following:
 
   
    (1) trusts for which MSDW Trust (an affiliate of the Investment Manager)
provides discretionary trustee services;
    
 
   
    (2) persons participating in a fee-based program approved by the
Distributor, pursuant to which such persons pay an asset based fee for services
in the nature of investment advisory, administrative and/ or brokerage services
(such investments are subject to all of the terms and conditions of such
programs, which may include termination fees, mandatory redemption upon
termination and such other circumstances as specified in the programs'
agreements, and restrictions on transferability of Fund shares);
    
 
   
    (3) employer-sponsored 401(k) and other plans qualified under Section 401(a)
of the Internal Revenue Code ("Qualified Retirement Plans") with at least 200
eligible employees and for which MSDW Trust serves as Trustee or DWR's
Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement;
    
 
   
    (4) Qualified Retirement Plans for which MSDW Trust serves as Trustee or
DWR's Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement whose Class B shares have converted to Class A
shares, regardless of the plan's asset size or number of eligible employees;
    
 
    (5) investors who are clients of a Dean Witter account executive who joined
Dean Witter from another investment firm within six months prior to the date of
purchase of Fund shares by such investors, if the shares are being purchased
with the proceeds from a redemption of shares of an open-end proprietary mutual
fund of the account executive's previous firm which imposed either a front-end
or deferred sales charge, provided such purchase was made within sixty days
after the redemption and the proceeds of the redemption had been maintained in
the interim in cash or a money market fund; and
 
    (6) other categories of investors, at the discretion of the Board, as
disclosed in the then current prospectus of the Fund.
 
    No CDSC will be imposed on redemptions of shares purchased pursuant to
paragraphs  (1),  (2) or  (5), above.
 
    For further information concerning purchases of the Fund's shares, contact
DWR or another Selected Broker-Dealer or consult the Statement of Additional
Information.
 
CONTINGENT DEFERRED SALES CHARGE
ALTERNATIVE--CLASS B SHARES
 
   
    Class B shares are sold at net asset value next determined without an
initial sales charge so that the full amount of an investor's purchase payment
may be immediately invested in the Fund. A CDSC, however, will be imposed on
most Class B shares redeemed within six years after purchase. The CDSC will be
imposed on any redemption of shares if after such redemption the aggregate
current value of a Class B account with the Fund falls below the aggregate
amount of the investor's purchase payments for Class B shares made during the
six years (or, in the case of shares held by certain Qualified Retirement Plans,
three years) preceding the redemption. In addition, Class B shares are subject
to an annual 12b-1 fee of 0.75% (0.65% on amounts over $10 billion) of the
lesser of: (a) the average daily aggregate gross sales of the Fund's Class B
shares since the inception of the Fund (not including reinvestments of dividends
or capital gains distributions), less the average daily aggregate net asset
value of the Fund's Class B shares redeemed since the Fund's inception upon
which a CDSC has been imposed or waived, or (b) the average daily net assets of
Class B.
    
 
                                       21
<PAGE>
    Except as noted below, Class B shares of the Fund which are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were purchased) will not be subject to any CDSC upon redemption.
Shares redeemed earlier than six years after purchase may, however, be subject
to a CDSC which will be a percentage of the dollar amount of shares redeemed and
will be assessed on an amount equal to the lesser of the current market value or
the cost of the shares being redeemed. The size of this percentage will depend
upon how long the shares have been held, as set forth in the following table:
 
<TABLE>
<CAPTION>
         YEAR SINCE PURCHASE            CDSC AS A PERCENTAGE
             PAYMENT MADE                OF AMOUNT REDEEMED
- --------------------------------------  ---------------------
<S>                                     <C>
First.................................          5.0%
Second................................          4.0%
Third.................................          3.0%
Fourth................................          2.0%
Fifth.................................          2.0%
Sixth.................................          1.0%
Seventh and thereafter................          None
</TABLE>
 
   
    In the case of Class B shares of the Fund purchased on or after July 28,
1997 by Qualified Retirement Plans for which MSDW Trust serves as Trustee or
DWR's Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement, shares held for three years or more after
purchase (calculated as described in the paragraph above) will not be subject to
any CDSC upon redemption. However, shares redeemed earlier than three years
after purchase may be subject to a CDSC (calculated as described in the
paragraph above), the percentage of which will depend on how long the shares
have been held, as set forth in the following table:
    
 
<TABLE>
<CAPTION>
         YEAR SINCE PURCHASE            CDSC AS A PERCENTAGE
             PAYMENT MADE                OF AMOUNT REDEEMED
- --------------------------------------  ---------------------
<S>                                     <C>
First.................................          2.0%
Second................................          2.0%
Third.................................          1.0%
Fourth and thereafter.................          None
</TABLE>
 
   
    CDSC WAIVERS.  A CDSC will not be imposed on: (i) any amount which
represents an increase in value of shares purchased within the six years (or, in
the case of shares held by certain Qualified Retirement Plans, three years)
preceding the redemption; (ii) the current net asset value of shares purchased
more than six years (or, in the case of shares held by certain Qualified
Retirement Plans, three years) prior to the redemption; and (iii) the current
net asset value of shares purchased through reinvestment of dividends or
distributions and/or shares acquired in exchange for shares of FSC Funds or of
other Dean Witter Funds acquired in exchange for such shares. Moreover, in
determining whether a CDSC is applicable it will be assumed that amounts
described in (i), (ii) and (iii) above (in that order) are redeemed first.
    
 
    In addition, the CDSC, if otherwise applicable, will be waived in the case
of:
 
    (1) redemptions of shares held at the time a shareholder dies or becomes
disabled, only if the shares are: (a) registered either in the name of an
individual shareholder (not a trust), or in the names of such shareholder and
his or her spouse as joint tenants with right of survivorship; or (b) held in a
qualified corporate or self-employed retirement plan, Individual Retirement
Account ("IRA") or Custodial Account under Section 403(b)(7) of the Internal
Revenue Code ("403(b) Custodial Account"), provided in either case that the
redemption is requested within one year of the death or initial determination of
disability;
 
    (2) redemptions in connection with the following retirement plan
distributions:  (a) lump-sum or other distributions from a qualified corporate
or self-employed retirement plan following retirement (or, in the case of a "key
employee" of a "top heavy" plan, following attainment of age 59 1/2); (b)
distributions from an IRA or 403(b) Custodial Account following attainment of
age 59 1/2; or  (c) a tax-free return of an excess contribution to an IRA; and
 
   
    (3) all redemptions of shares held for the benefit of a participant in a
Qualified Retirement Plan
    
 
                                       22
<PAGE>
   
which offers investment companies managed by the Investment Manager or its
subsidiary, Dean Witter Services Company Inc., as self-directed investment
alternatives and for which MSDW Trust serves as Trustee or DWR's Retirement Plan
Services serves as recordkeeper pursuant to a written Recordkeeping Services
Agreement ("Eligible Plan"), provided that either: (a) the plan continues to be
an Eligible Plan after the redemption; or (B) the redemption is in connection
with the complete termination of the plan involving the distribution of all plan
assets to participants.
    
 
    With reference to  (1) above, for the purpose of determining disability, the
Distributor utilizes the definition of disability contained in Section 72(m)(7)
of the Internal Revenue Code, which relates to the inability to engage in
gainful employment. With reference to  (2) above, the term "distribution" does
not encompass a direct transfer of IRA, 403(b) Custodial Account or retirement
plan assets to a successor custodian or trustee. All waivers will be granted
only following receipt by the Distributor of confirmation of the shareholder's
entitlement.
 
   
    CONVERSION TO CLASS A SHARES.  All shares of the Fund held prior to July 28,
1997 (other than shares held by certain employee benefit plans established by
DWR and its affiliate, SPS Transaction Services, Inc.) have been designated
Class B shares. Shares held before May 1, 1997 that have been designated Class B
shares will convert to Class A shares in May, 2007. In all other instances Class
B shares will convert automatically to Class A shares, based on the relative net
asset values of the shares of the two Classes on the conversion date, which will
be approximately ten (10) years after the date of the original purchase. The ten
year period is calculated from the last day of the month in which the shares
were purchased or, in the case of Class B shares acquired through an exchange or
a series of exchanges, from the last day of the month in which the original
Class B shares were purchased, provided that shares originally purchased before
May 1, 1997 will convert to Class A shares in May, 2007. The conversion of
shares purchased on or after May 1, 1997 will take place in the month following
the tenth anniversary of the purchase. There will also be converted at that time
such proportion of Class B shares acquired through automatic reinvestment of
dividends and distributions owned by the shareholder as the total number of his
or her Class B shares converting at the time bears to the total number of
outstanding Class B shares purchased and owned by the shareholder. In the case
of Class B shares held by a Qualified Retirement Plan for which MSDW Trust
serves as Trustee or DWR's Retirement Plan Services serves as recordkeeper
pursuant to a written Recordkeeping Services Agreement, the plan is treated as a
single investor and all Class B shares will convert to Class A shares on the
conversion date of the first shares of a Dean Witter Multi-Class Fund purchased
by that plan. In the case of Class B shares previously exchanged for shares of
an "Exchange Fund" (see "Shareholder Services--Exchange Privilege"), the period
of time the shares were held in the Exchange Fund (calculated from the last day
of the month in which the Exchange Fund shares were acquired) is excluded from
the holding period for conversion. If those shares are subsequently re-exchanged
for Class B shares of a Dean Witter Multi-Class Fund, the holding period resumes
on the last day of the month in which Class B shares are reacquired.
    
 
    If a shareholder has received share certificates for Class B shares, such
certificates must be delivered to the Transfer Agent at least one week prior to
the date for conversion. Class B shares evidenced by share certificates that are
not received by the Transfer Agent at least one week prior to any conversion
date will be converted into Class A shares on the next scheduled conversion date
after such certificates are received.
 
    Effectiveness of the conversion feature is subject to the continuing
availability of a ruling of the Internal Revenue Service or an opinion of
counsel that (i) the conversion of shares does not constitute a taxable event
under the Internal Revenue Code, (ii) Class A shares received on conversion will
have
 
                                       23
<PAGE>
   
a basis equal to the shareholder's basis in the converted Class B shares
immediately prior to the conversion, and (iii) Class A shares received on
conversion will have a holding period that includes the holding period of the
converted Class B shares. The conversion feature may be suspended if the ruling
or opinion is no longer available. In such event, Class B shares would continue
to be subject to Class B 12b-1 fees.
    
 
LEVEL LOAD ALTERNATIVE--CLASS C SHARES
 
    Class C shares are sold at net asset value next determined without an
initial sales charge but are subject to a CDSC of 1.0% on most redemptions made
within one year after purchase (calculated from the last day of the month in
which the shares were purchased). The CDSC will be assessed on an amount equal
to the lesser of the current market value or the cost of the shares being
redeemed. The CDSC will not be imposed in the circumstances set forth above in
the section "Contingent Deferred Sales Charge Alternative--Class B Shares--CDSC
Waivers," except that the references to six years in the first paragraph of that
section shall mean one year in the case of Class C shares. Class C shares are
subject to an annual 12b-1 fee of up to 0.75% of the average daily net assets of
the Class. Unlike Class B shares, Class C shares have no conversion feature and,
accordingly, an investor that purchases Class C shares will be subject to 12b-1
fees applicable to Class C shares for an indefinite period subject to annual
approval by the Fund's Board of Trustees and regulatory limitations.
 
NO LOAD ALTERNATIVE--CLASS D SHARES
 
   
    Class D shares are offered without any sales charge on purchase or
redemption and without any 12b-1 fee. Class D shares are offered only to
investors meeting an initial investment minimum of $5 million ($25 million for
Qualified Retirement Plans for which MSDW Trust serves as Trustee or DWR's
Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement) and the following categories of investors: (i)
investors participating in the InterCapital mutual fund asset allocation program
pursuant to which such persons pay an asset based fee; (ii) persons
participating in a fee-based program approved by the Distributor, pursuant to
which such persons pay an asset based fee for services in the nature of
investment advisory, administrative and/or brokerage services (subject to all of
the terms and conditions of such programs referred to in (i) and (ii) above,
which may include termination fees, mandatory redemption upon termination and
such other circumstances as specified in the programs' agreements, and
restrictions on transferability of Fund shares); (iii) 401(k) plans established
by DWR and SPS Transaction Services, Inc. (an affiliate of DWR) for their
employees; (iv) certain Unit Investment Trusts sponsored by DWR; (v) certain
other open-end investment companies whose shares are distributed by the
Distributor; and (vi) other categories of investors, at the discretion of the
Board, as disclosed in the then current prospectus of the Fund. Shares of the
Fund held by the employee benefit plans referred to in clause (iii) above prior
to July 28, 1997 have been designated Class D shares. Investors who require a $5
million (or $25 million) minimum initial investment to qualify to purchase Class
D shares may satisfy that requirement by investing that amount in a single
transaction in Class D shares of the Fund and other Dean Witter Multi-Class
Funds, subject to the $1,000 minimum initial investment required for that Class
of the Fund. In addition, for the purpose of meeting the $5 million (or $25
million) minimum investment amount, holdings of Class A shares in all Dean
Witter Multi-Class Funds, shares of FSC Funds and shares of Dean Witter Funds
for which such shares have been exchanged will be included together with the
current investment amount. If a shareholder redeems Class A shares and purchases
Class D shares, such redemption may be a taxable event.
    
 
PLAN OF DISTRIBUTION
 
    The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Act with respect to the distribution of Class A, Class B and Class C shares of
the Fund. In the case of Class A and Class C shares, the Plan provides that the
Fund will
 
                                       24
<PAGE>
reimburse the Distributor and others for the expenses of certain activities and
services incurred by them specifically on behalf of those shares. Reimbursements
for these expenses will be made in monthly payments by the Fund to the
Distributor, which will in no event exceed amounts equal to payments at the
annual rates of 0.25% and 0.75% of the average daily net assets of Class A and
Class C, respectively. In the case of Class B shares, the Plan provides that the
Fund will pay the Distributor a fee, which is accrued daily and paid monthly, at
the annual rate of 0.75% (0.65% on amounts over $10 billion) of the lesser of:
(a) the average daily aggregate gross sales of the Fund's Class B shares since
the inception of the Fund (not including reinvestments of dividends or capital
gains distributions), less the average daily aggregate net asset value of the
Fund's Class B shares redeemed since the Fund's inception upon which a CDSC has
been imposed or waived, or (b) the average daily net assets of Class B. The fee
is treated by the Fund as an expense in the year it is accrued. In the case of
Class A shares, the entire amount of the fee currently represents a service fee
within the meaning of the NASD guidelines. In the case of Class B and Class C
shares, a portion of the fee payable pursuant to the Plan, equal to 0.20% and
0.25% of the average daily net assets of each of these Classes, respectively, is
currently characterized as a service fee. A service fee is a payment made for
personal service and/or the maintenance of shareholder accounts.
 
    Additional amounts paid under the Plan in the case of Class B and Class C
shares are paid to the Distributor for services provided and the expenses borne
by the Distributor and others in the distribution of the shares of those
Classes, including the payment of commissions for sales of the shares of those
Classes and incentive compensation to and expenses of DWR's account executives
and others who engage in or support distribution of shares or who service
shareholder accounts, including overhead and telephone expenses; printing and
distribution of prospectuses and reports used in connection with the offering of
the Fund's shares to other than current shareholders; and preparation, printing
and distribution of sales literature and advertising materials. In addition, the
Distributor may utilize fees paid pursuant to the Plan in the case of Class B
shares to compensate DWR and other Selected Broker-Dealers for their opportunity
costs in advancing such amounts, which compensation would be in the form of a
carrying charge on any unreimbursed expenses.
 
   
    For the fiscal year ended December 31, 1997, Class B shares of the Fund
accrued payments under the Plan amounting to $43,758,596, which amount is equal
to 0.75% of the Fund's average daily net assets of Class B for the fiscal year.
These payments were calculated pursuant to clause (b) of the compensation
formula under the Plan. All shares held prior to July 28, 1997 have been
designated Class B shares. For the fiscal period July 28, 1997 through December
31, 1997, Class A and Class C shares of the Fund accrued payments under the Plan
amounting to $13,027 and $7,914, respectively, which amounts on an annualized
basis are equal to 0.25% and 0.75% of the average daily net assets of Class A
and Class C, respectively, for such period.
    
 
   
    In the case of Class B shares, at any given time, the expenses in
distributing Class B shares of the Fund may be in excess of the total of (i) the
payments made by the Fund pursuant to the Plan, and (ii) the proceeds of CDSCs
paid by investors upon the redemption of Class B shares. For example, if $1
million in expenses in distributing Class B shares of the Fund had been incurred
and $750,000 had been received as described in (i) and (ii) above, the excess
expense would amount to $250,000. The Distributor has advised the Fund that such
excess amounts, including the carrying charge described above, totalled
$34,202,402 at December 31, 1997, which was equal to 0.63% of the net assets of
Class B on such date. Because there is no requirement under the Plan that the
Distributor be reimbursed for all distribution expenses or any requirement that
the Plan be continued from year to year, such excess amount does not constitute
a liability of the Fund. Although there is no legal obligation for
    
 
                                       25
<PAGE>
the Fund to pay expenses incurred in excess of payments made to the Distributor
under the Plan, and the proceeds of CDSCs paid by investors upon redemption of
shares, if for any reason the Plan is terminated the Trustees will consider at
that time the manner in which to treat such expenses. Any cumulative expenses
incurred, but not yet recovered through distribution fees or CDSCs, may or may
not be recovered through future distribution fees or CDSCs.
   
    In the case of Class A and Class C shares, expenses incurred pursuant to the
Plan in any calendar year in excess of 0.25% or 0.75% of the average daily net
assets of Class A or Class C, respectively, will not be reimbursed by the Fund
through payments in any subsequent year, except that expenses representing a
gross sales commission credited to account executives at the time of sale may be
reimbursed in the subsequent calendar year. The Distributor has advised the Fund
that unreimbursed expenses representing a gross sales commission credited to
account executives at the time of sale totalled $39,501 in the case of Class C
at December 31, 1997, which amount was equal to 0.90% of the net assets of Class
C on such date, and that there were no such expenses that may be reimbursed in
the subsequent year in the case of Class A on such date. No interest or other
financing charges will be incurred on any Class A or Class C distribution
expenses incurred by the Distributor under the Plan or on any unreimbursed
expenses due to the Distributor pursuant to the Plan.
    
 
DETERMINATION OF NET ASSET VALUE
    The net asset value per share is determined once daily at 4:00 p.m., New
York time (or, on days when the New York Stock Exchange closes prior to 4:00
p.m., at such earlier time), on each day that the New York Stock Exchange is
open by taking the net assets of the Fund, dividing by the number of shares
outstanding and adjusting to the nearest cent. The assets belonging to the Class
A, Class B, Class C and Class D shares will be invested together in a single
portfolio. The net asset value of each Class, however, will be determined
separately by subtracting each Class's accrued expenses and liabilities. The net
asset value per share will not be determined on Good Friday and on such other
federal and non-federal holidays as are observed by the New York Stock Exchange.
 
    In the calculation of the Fund's net asset value: (1) all portfolio
securities for which over-the-counter market quotations are readily available
are valued at the bid price; (2) when market quotations are not readily
available, including circumstances under which it is determined by the
Investment Manager that sale or bid prices are not reflective of a security's
market value, portfolio securities are valued at their fair value as determined
in good faith under procedures established by and under the general supervision
of the Fund's Board of Trustees (valuation of securities for which market
quotations are not readily available may be based upon current market prices of
securities which are comparable in coupon, rating and maturity or an appropriate
matrix utilizing similar factors); and (3) short-term instruments having a
maturity date of more than sixty days are valued on a "mark-to-market" basis,
that is, at prices based on market quotations for securities of similar type,
yield, quality and maturity, until sixty days prior to maturity and thereafter
at amortized cost. Short-term instruments having a maturity date of sixty days
or less at the time of purchase are valued at amortized cost unless the Board of
Trustees determines this does not represent fair market value.
 
    Certain of the Fund's portfolio securities may be valued by an outside
pricing service approved by the Fund's Trustees. The pricing service may utilize
a matrix system incorporating security quality, maturity and coupon as the
evaluation model parameters, and/or research evaluations by its staff, including
review of broker-dealer market price quotations, in determining what it believes
is the fair valuation of the portfolio securities valued by such pricing
service.
 
                                       26
<PAGE>
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
    AUTOMATIC INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS.  All dividends and
capital gains distributions are automatically paid in full and fractional shares
of the applicable Class of the Fund (or, if specified by the shareholder, in
shares of any other open-end Dean Witter Fund), unless the shareholder requests
that they be paid in cash. Shares so acquired are acquired at net asset value
and are not subject to the imposition of a front-end sales charge or a CDSC (see
"Redemptions and Repurchases"). Such dividends and distributions will be paid,
at the net asset value per share, in shares of the applicable Class of the Fund
(or in cash if the shareholder so requests) on the monthly payment date, which
generally will be no later than the last business day of the month for which the
dividend or distribution is payable. Processing of dividend checks begins
immediately following the monthly payment date. Shareholders who have requested
to receive dividends in cash will normally receive their monthly dividend check
during the first ten days of the following month.
 
    INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS RECEIVED IN CASH.  Any shareholder
who receives a cash payment representing a dividend or capital gains
distribution may invest such dividend or distribution in shares of the
applicable Class at the net asset value per share next determined after receipt
by the Transfer Agent, by returning the check or the proceeds to the Transfer
Agent within thirty days after the payment date. Shares so acquired are acquired
at net asset value and are not subject to the imposition of a front-end sales
charge or a CDSC (see "Redemptions and Repurchases").
 
    EASYINVEST-SM-.  Shareholders may subscribe to EasyInvest, an automatic
purchase plan which provides for any amount from $100 to $5,000 to be
transferred automatically from a checking or savings account or following
redemption of shares of a Dean Witter money market fund, on a semi-monthly,
monthly or quarterly basis, to the Transfer Agent for investment in shares of
the Fund (see "Purchase of Fund Shares" and "Redemptions and
Repurchases--Involuntary Redemption").
 
    SYSTEMATIC WITHDRAWAL PLAN.  A systematic withdrawal plan (the "Withdrawal
Plan") is available for shareholders who own or purchase shares of the Fund
having a minimum value of $10,000 based upon the then current net asset value.
The Withdrawal Plan provides for monthly or quarterly (March, June, September
and December) checks in any dollar amount, not less than $25, or in any whole
percentage of the account balance, on an annualized basis. Any applicable CDSC
will be imposed on shares redeemed under the Withdrawal Plan (See "Purchase of
Fund Shares"). Therefore, any shareholder participating in the Withdrawal Plan
will have sufficient shares redeemed from his or her account so that the
proceeds (net of any applicable CDSC) to the shareholder will be the designated
monthly or quarterly amount. Withdrawal plan payments should not be considered
as dividends, yields or income. If periodic withdrawal plan payments
continuously exceed net investment income and net capital gains, the
shareholder's original investment will be correspondingly reduced and ultimately
exhausted. Each withdrawal constitutes a redemption of shares and any gain or
loss realized must be recognized for federal income tax purposes.
 
    Shareholders should contact their DWR or other Selected Broker-Dealer
account executive or the Transfer Agent for further information about any of the
above services.
 
    TAX SHELTERED RETIREMENT PLANS.  Retirement plans are available for use by
corporations, the self-employed, Individual Retirement Accounts and Custodial
Accounts under Section 403(b)(7) of the Internal Revenue Code. Adoption of such
plans should be on advice of legal counsel or tax adviser.
 
    For further information regarding plan administration, custodial fees and
other details, investors should contact their account executive or the Transfer
Agent.
 
                                       27
<PAGE>
EXCHANGE PRIVILEGE
 
   
    Shares of each Class may be exchanged for shares of the same Class of any
other Dean Witter Multi-Class Fund without the imposition of any exchange fee.
Shares may also be exchanged for shares of the following funds: Dean Witter
Short-Term U.S. Treasury Trust, Dean Witter Limited Term Municipal Trust, Dean
Witter Short-Term Bond Fund, Dean Witter Intermediate Term U.S. Treasury Trust
and five Dean Witter funds which are money market funds (the "Exchange Funds").
Class A shares may also be exchanged for shares of Dean Witter Multi-State
Municipal Series Trust and Dean Witter Hawaii Municipal Trust, which are Dean
Witter Funds sold with a front-end sales charge ("FSC Funds"). Class B shares
may also be exchanged for shares of Dean Witter Global Short-Term Income Fund
Inc. ("Global Short-Term"), which is a Dean Witter Fund offered with a CDSC.
Exchanges may be made after the shares of the Fund acquired by purchase (not by
exchange or dividend reinvestment) have been held for thirty days. There is no
waiting period for exchanges of shares acquired by exchange or dividend
reinvestment.
    
 
   
    An exchange to another Dean Witter Multi-Class Fund, any FSC Fund, Global
Short-Term or any Exchange Fund that is not a money market fund is on the basis
of the next calculated net asset value per share of each fund after the exchange
order is received. When exchanging into a money market fund from the Fund,
shares of the Fund are redeemed out of the Fund at their next calculated net
asset value and the proceeds of the redemption are used to purchase shares of
the money market fund at their net asset value determined the following day.
Subsequent exchanges between any of the money market funds and any of the Dean
Witter Multi-Class Funds, FSC Funds, Global Short-Term or any Exchange Fund that
is not a money market fund can be effected on the same basis.
    
 
   
    No CDSC is imposed at the time of any exchange of shares, although any
applicable CDSC will be imposed upon ultimate redemption. During the period of
time the shareholder remains in an Exchange Fund (calculated from the last day
of the month in which the Exchange Fund shares were acquired), the holding
period (for the purpose of determining the rate of the CDSC) is frozen. If those
shares are subsequently re-exchanged for shares of a Dean Witter Multi-Class
Fund or shares of Global Short-Term, the holding period previously frozen when
the first exchange was made resumes on the last day of the month in which shares
of a Dean Witter Multi-Class Fund or shares of Global Short-Term are reacquired.
Thus, the CDSC is based upon the time (calculated as described above) the
shareholder was invested in shares of a Dean Witter Multi-Class Fund or in
shares of Global Short-Term (see "Purchase of Fund Shares"). In the case of
exchanges of Class A shares which are subject to a CDSC, the holding period also
includes the time (calculated as described above) the shareholder was invested
in shares of a FSC Fund. In the case of shares exchanged into an Exchange Fund
on or after April 23, 1990, upon a redemption of shares which results in a CDSC
being imposed, a credit (not to exceed the amount of the CDSC) will be given in
an amount equal to the Exchange Fund 12b-1 distribution fees incurred on or
after that date which are attributable to those shares. (Exchange Fund 12b-1
distribution fees are described in the prospectuses for those funds.) Class B
shares of the Fund acquired in exchange for shares of Global Short-Term or Class
B shares of another Dean Witter Multi-Class Fund having a different CDSC
schedule than that of this Fund will be subject to the higher CDSC schedule,
even if such shares are subsequently re-exchanged for shares of the fund with
the lower CDSC schedule.
    
 
    ADDITIONAL INFORMATION REGARDING EXCHANGES. Purchases and exchanges should
be made for investment purposes only. A pattern of frequent exchanges may be
deemed by the Investment Manager to be abusive and contrary to the best
interests of the Fund's other shareholders and, at the Investment Manager's
discretion, may be limited by the Fund's refusal to accept additional purchases
and/or exchanges from the investor. Although the Fund does not have any specific
definition of what
 
                                       28
<PAGE>
constitutes a pattern of frequent exchanges, and will consider all relevant
factors in determining whether a particular situation is abusive and contrary to
the best interests of the Fund and its other shareholders, investors should be
aware that the Fund and each of the other Dean Witter Funds may in their
discretion limit or otherwise restrict the number of times this Exchange
Privilege may be exercised by any investor. Any such restriction will be made by
the Fund on a prospective basis only, upon notice to the shareholder not later
than ten days following such shareholder's most recent exchange. Also, the
Exchange Privilege may be terminated or revised at any time by the Fund and/or
any of such Dean Witter Funds for which shares of the Fund have been exchanged,
upon such notice as may be required by applicable regulatory agencies.
Shareholders maintaining margin accounts with DWR or another Selected
Broker-Dealer are referred to their account executive regarding restrictions on
exchange of shares of the Fund pledged in the margin account.
 
    The current prospectus for each fund describes its investment objective(s)
and policies, and shareholders should obtain a copy and examine it carefully
before investing. Exchanges are subject to the minimum investment requirement of
each Class of Shares and any other conditions imposed by each fund. In the case
of a shareholder holding a share certificate or certificates, no exchanges may
be made until all applicable share certificates have been received by the
Transfer Agent and deposited in the shareholder's account. An exchange will be
treated for federal income tax purposes the same as a repurchase or redemption
of shares, on which the shareholder may realize a capital gain or loss. However,
the ability to deduct capital losses on an exchange may be limited in situations
where there is an exchange of shares within ninety days after the shares are
purchased. The Exchange Privilege is only available in states where an exchange
may legally be made.
 
    If DWR or another Selected Broker-Dealer is the current dealer of record and
its account numbers are part of the account information, shareholders may
initiate an exchange of shares of the Fund for shares of any of the Dean Witter
Funds (for which the Exchange Privilege is available) pursuant to this Exchange
Privilege by contacting their account executive (no Exchange Privilege
Authorization Form is required). Other shareholders (and those shareholders who
are clients of DWR or another Selected Broker-Dealer but who wish to make
exchanges directly by writing or telephoning the Transfer Agent) must complete
and forward to the Transfer Agent an Exchange Privilege Authorization Form,
copies of which may be obtained from the Transfer Agent, to initiate an
exchange. If the Authorization Form is used, exchanges may be made in writing or
by contacting the Transfer Agent at (800) 869-NEWS (toll-free).
 
    The Fund will employ reasonable procedures to confirm that exchange
instructions communicated over the telephone are genuine. Such procedures may
include requiring various forms of personal identification such as name, mailing
address, social security or other tax identification number and DWR or other
Selected Broker-Dealer account number (if any). Telephone instructions may also
be recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent between 9:00 a.m. and 4:00 p.m., New York time, on any day the New York
Stock Exchange is open. Any shareholder wishing to make an exchange who has
previously filed an Exchange Privilege Authorization Form and who is unable to
reach the Fund by telephone should contact his or her DWR or other Selected
Broker-Dealer account executive, if appropriate, or make a written exchange
request. Shareholders are advised that during periods of drastic economic or
market changes, it is possible that the telephone exchange procedures may be
difficult to implement, although this has not been the case with the Dean Witter
Funds in the past.
 
                                       29
<PAGE>
    Shareholders should contact their DWR or other Selected Broker-Dealer
account executive or the Transfer Agent for further information about the
Exchange Privilege.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
    REDEMPTION.  Shares of each Class of the Fund can be redeemed for cash at
any time at the net asset value per share next determined less the amount of any
applicable CDSC in the case of Class A, Class B or Class C shares (see "Purchase
of Fund Shares"). If shares are held in a shareholder's account without a share
certificate, a written request for redemption to the Fund's Transfer Agent at
P.O. Box 983, Jersey City, NJ 07303 is required. If certificates are held by the
shareholder, the shares may be redeemed by surrendering the certificates with a
written request for redemption, along with any additional information required
by the Transfer Agent.
 
    REPURCHASE.  DWR and other Selected Broker-Dealers are authorized to
repurchase shares represented by a share certificate which is delivered to any
of their offices. Shares held in a shareholder's account without a share
certificate may also be repurchased by DWR and other Selected Broker-Dealers
upon the telephonic request of the shareholder. The repurchase price is the net
asset value next computed (see "Purchase of Fund Shares") after such repurchase
order is received by DWR or other Selected Broker-Dealer reduced by any
applicable CDSC.
 
   
    The CDSC, if any, will be the only fee imposed by the Fund or the
Distributor. The offer by DWR and other Selected Broker-Dealers to repurchase
shares may be suspended without notice by them at any time. In that event,
shareholders may redeem their shares through the Fund's Transfer Agent as set
forth above under "Redemption."
    
 
    PAYMENT FOR SHARES REDEEMED OR REPURCHASED.  Payment for shares presented
for repurchase or redemption will be made by check within seven days after
receipt by the Transfer Agent of the certificate and/or written request in good
order. Such payment may be postponed or the right of redemption suspended under
unusual circumstances, e.g., when normal trading is not taking place on the New
York Stock Exchange. If the shares to be redeemed have recently been purchased
by check, payment of the redemption proceeds may be delayed for the minimum time
needed to verify that the check used for investment has been honored (not more
than fifteen days from the time of receipt of the check by the Transfer Agent).
Shareholders maintaining margin accounts with DWR or another Selected
Broker-Dealer are referred to their account executive regarding restrictions on
redemption of shares of the Fund pledged in the margin account.
 
    REINSTATEMENT PRIVILEGE.  A shareholder who has had his or her shares
redeemed or repurchased and has not previously exercised this reinstatement
privilege may, within 35 days after the date of the redemption or repurchase,
reinstate any portion or all of the proceeds of such redemption or repurchase in
shares of the Fund in the same Class from which such shares were redeemed or
repurchased, at their net asset value next determined after a reinstatement
request, together with the proceeds, is received by the Transfer Agent and
receive a pro rata credit for any CDSC paid in connection with such redemption
or repurchase.
 
    INVOLUNTARY REDEMPTION.  The Fund reserves the right, on sixty days' notice,
to redeem, at their net asset value, the shares of any shareholder (other than
shares held in an Individual Retirement Account or Custodial Account under
Section 403(b)(7) of the Internal Revenue Code) whose shares due to redemptions
by the shareholder have a value of less than $100, or such lesser amount as may
be fixed by the Trustees or, in the case of an account opened through
EasyInvest, if after twelve months the shareholder has invested less than $1,000
in the account. However, before the Fund redeems such shares and sends the
proceeds to
 
                                       30
<PAGE>
the shareholder, it will notify the shareholder that the value of the shares is
less than the applicable amount and allow the shareholder sixty days to make an
additional investment in an amount which will increase the value of his or her
account to at least the applicable amount before the redemption is processed. No
CDSC will be imposed on any involuntary redemption.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    DIVIDENDS AND DISTRIBUTIONS.  The Fund declares dividends separately for
each Class of shares from net investment income on each day the New York Stock
Exchange is open for business to shareholders of record as of the close of
business the preceding business day. The amount of dividend may fluctuate from
day to day. Such dividends are paid monthly. The Fund intends to distribute
substantially all of its net investment income on an annual basis.
 
    The Fund may distribute quarterly net realized short-term capital gains, if
any, in excess of any net realized long-term capital losses. The Fund intends to
distribute dividends from net long-term capital gains, if any, at least once
each year. The Fund may, however, elect to retain all or a portion of any net
long-term capital gains in any year for reinvestment.
 
    All dividends and any capital gains distributions will be paid in additional
shares of the same Class and automatically credited to the shareholder's account
without issuance of a share certificate unless the shareholder requests in
writing that all dividends or all dividends and distributions be paid in cash.
Shares acquired by dividend and distribution reinvestments will not be subject
to any front-end sales charge or CDSC. Class B shares acquired through dividend
and distribution reinvestments will become eligible for conversion to Class A
shares on a pro rata basis. Distributions paid on Class A and Class D shares
will be higher than for Class B and Class C shares because distribution fees
paid by Class B and Class C shares are higher. (See "Shareholder
Services--Automatic Investment of Dividends and Distributions".)
    TAXES.  Because the Fund intends to distribute substantially all of its net
investment income and net short-term capital gains to shareholders and continue
to qualify as a regulated investment company under Subchapter M of the Internal
Revenue Code, it is not expected that the Fund will be required to pay any
federal income tax on such income and capital gains.
 
    Shareholders who are required to pay taxes on their income will normally
have to pay federal income taxes, and any applicable state and/or local income
taxes, on the dividends and distributions they receive from the Fund. Such
dividends and distributions, to the extent that they are derived from net
investment income and net short-term capital gains, are taxable to the
shareholder as ordinary dividend income regardless of whether the shareholder
receives such distributions in additional shares or in cash. Any dividends
declared in the last quarter of any calendar year which are paid in the
following year prior to February 1 will be deemed, for tax purposes, to have
been received by the shareholder in the prior year.
 
   
    Any dividends declared in the last quarter of any calendar year which are
paid in the following calendar year prior to February 1 will be deemed, for tax
purposes, to have been received by the shareholder in the prior calendar year.
    
 
    Distributions of net long-term capital gains, if any, are taxable to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional shares or in cash. Capital gains distributions are not eligible for
the corporate dividends received deduction.
 
    The Fund may at times make payments from sources other than income or net
capital gains. Payments from such sources would, in effect, represent
 
                                       31
<PAGE>
a return of a portion of each shareholder's investment. All, or a portion, of
such payments would not be taxable to shareholders.
 
   
    After the end of the calendar year, shareholders will be sent full
information on their dividends and capital gains distributions for tax purposes.
Shareholders will also be notified of their proportionate share of long-term
capital gains distributions that are eligible for a reduced rate of tax under
the Taxpayer Relief Act of 1997.
    
 
    To avoid being subject to a 31% federal backup withholding tax on taxable
dividends, capital gains distributions and the proceeds of redemptions and
repurchases, shareholders' taxpayer identification numbers must be furnished and
certified as to accuracy.
 
    The foregoing discussion relates solely to the federal income tax
consequences of an investment in the Fund. Distributions may also be subject to
state and local taxes; therefore, each shareholder is advised to consult his or
her own tax adviser.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
    From time to time the Fund may quote its "yield" and/or its"total return" in
advertisements and sales literature. These figures are computed separately for
Class A, Class B, Class C and Class D shares. Both the yield and the total
return of the Fund are based on historical earnings and are not intended to
indicate future performance. The yield of each Class of the Fund is computed by
dividing the Class's net investment income over a 30-day period by an average
value (using the average number of shares entitled to receive dividends and the
maximum offering price per share at the end of the period), all in accordance
with applicable regulatory requirements. Such amount is compounded for six
months and then annualized for a twelve-month period to derive the Fund's yield
for each Class.
 
    The "average annual total return" of the Fund refers to a figure reflecting
the average annualized percentage increase (or decrease) in the value of an
initial investment in a Class of the Fund of $1,000 over periods of one, five
and ten years. Average annual total return reflects all income earned by the
Fund, any appreciation or depreciation of the Fund's assets, all expenses
incurred by the applicable Class and all sales charges which would be incurred
by shareholders, for the stated periods. It also assumes reinvestment of all
dividends and distributions paid by the Fund.
 
    In addition to the foregoing, the Fund may advertise its total return for
each Class over different periods of time by means of aggregate, average, and
year-by-year or other types of total return figures. Such calculations may or
may not reflect the deduction of any sales charge which, if reflected, would
reduce the performance quoted. The Fund may also advertise the growth of
hypothetical investments of $10,000, $50,000 and $100,000 in each Class of
shares of the Fund. The Fund from time to time may also advertise its
performance relative to certain performance rankings and indexes compiled by
independent organizations.
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
    VOTING RIGHTS.  All shares of beneficial interest of the Fund are of $0.01
par value and are equal as to earnings, assets and voting privileges except that
each Class will have exclusive voting privileges with respect to matters
relating to distribution expenses borne solely by such Class or any other matter
in which the interests of one Class differ from the interests of any other
Class. In addition, Class B shareholders will have the right to vote on any
proposed material increase in Class A's expenses, if such proposal is submitted
separately to Class A shareholders. Also, as discussed herein, Class A, Class B
and
 
                                       32
<PAGE>
Class C bear the expenses related to the distribution of their respective
shares.
 
    The Fund is not required to hold Annual Meetings of Shareholders and in
ordinary circumstances the Fund does not intend to hold such meetings. The
Trustees may call Special Meetings of Shareholders for action by shareholder
vote as may be required by the Act or the Declaration of Trust. Under certain
circumstances the Trustees may be removed by action of the Trustees or by the
shareholders.
 
    Under Massachusetts law, shareholders of a business trust may, under certain
circumstances, be held personally liable as partners for the obligations of the
Fund. However, the Declaration of Trust contains an express disclaimer of
shareholder liability for acts or obligations of the Fund, requires that Fund
obligations include such disclaimer, and provides for indemnification and
reimbursement of expenses out of the Fund's property for any shareholder held
personally liable for the obligations of the Fund. Thus, the risk of a
shareholder incurring financial loss on account of shareholder liability is
limited to circumstances in which the Fund itself would be unable to meet its
obligations. Given the above limitations on shareholder personal liability, and
the nature of the Fund's assets and operations, the possibility of the Fund
being unable to meet its obligations is remote and, in the opinion of
Massachusetts counsel to the Fund, the risk to Fund shareholders of personal
liability is remote.
 
    CODE OF ETHICS.  Directors, officers and employees of InterCapital, Dean
Witter Services Company Inc. and the Distributor are subject to a strict Code of
Ethics adopted by those companies. The Code of Ethics is intended to ensure that
the interests of shareholders and other clients are placed ahead of any personal
interest, that no undue personal benefit is obtained from a person's employment
activities and that actual and potential conflicts of interest are avoided. To
achieve these goals and comply with regulatory requirements, the Code of Ethics
requires, among other things, that personal securities transactions by employees
of the companies be subject to an advance clearance process to monitor that no
Dean Witter Fund is engaged at the same time in a purchase or sale of the same
security. The Code of Ethics bans the purchase of securities in an initial
public offering, and also prohibits engaging in futures and options transactions
and profiting on short-term trading (that is, a purchase within sixty days of a
sale or a sale within sixty days of a purchase) of a security. In addition,
investment personnel may not purchase or sell a security for their personal
account within thirty days before or after any transaction in any Dean Witter
Fund managed by them. Any violations of the Code of Ethics are subject to
sanctions, including reprimand, demotion or suspension or termination of
employment. The Code of Ethics comports with regulatory requirements and the
recommendations in the 1994 report by the Investment Company Institute Advisory
Group on Personal Investing.

    MASTER/FEEDER CONVERSION.  The Fund reserves the right to seek to achieve
its investment objective by investing all of its investable assets in a
diversified, open-end management investment company having the same investment
objective and policies and substantially the same investment restrictions as
those applicable to the Fund.

    SHAREHOLDER INQUIRIES.  All inquiries regarding the Fund should be directed
to the Fund at the telephone numbers or address set forth on the front cover of
this Prospectus.
 
                                       33
<PAGE>
   
                        THE DEAN WITTER FAMILY OF FUNDS
    
 
   
MONEY MARKET FUNDS                       FIXED-INCOME FUNDS
Dean Witter California Tax-Free Daily    Dean Witter Balanced Income Fund
Income Trust                             Dean Witter California Tax-Free Income
Dean Witter Liquid Asset Fund Inc.       Fund
Dean Witter New York Municipal Money     Dean Witter Convertible Securities
Market Trust                             Trust
Dean Witter Tax-Free Daily Income Trust  Dean Witter Diversified Income Trust
Dean Witter U.S. Government Money        Dean Witter Federal Securities Trust
Market Trust                             Dean Witter Global Short-Term Income
EQUITY FUNDS                             Fund Inc.
Dean Witter American Value Fund          Dean Witter Hawaii Municipal Trust
Dean Witter Balanced Growth Fund         Dean Witter High Yield Securities Inc.
Dean Witter Capital Appreciation Fund    Dean Witter Intermediate Income
Dean Witter Capital Growth Securities    Securities
Dean Witter Developing Growth            Dean Witter Intermediate Term U.S.
Securities Trust                         Treasury Trust
Dean Witter Dividend Growth Securities   Dean Witter Limited Term Municipal
Inc.                                     Trust
Dean Witter European Growth Fund Inc.    Dean Witter Multi-State Municipal
Dean Witter Financial Services Trust     Series Trust
Dean Witter Fund of Funds                Dean Witter New York Tax-Free Income
Dean Witter Global Dividend Growth       Fund
Securities                               Dean Witter Short-Term Bond Fund
Dean Witter Global Utilities Fund        Dean Witter Short-Term U.S. Treasury
Dean Witter Health Sciences Trust        Trust
Dean Witter Income Builder Fund          Dean Witter Tax-Exempt Securities Trust
Dean Witter Information Fund             Dean Witter U.S. Government Securities
Dean Witter International SmallCap Fund  Trust
Dean Witter Japan Fund                   Dean Witter World Wide Income Trust
Dean Witter Market Leader Trust          DEAN WITTER RETIREMENT SERIES
Dean Witter Mid-Cap Growth Fund          American Value Series
Dean Witter Natural Resource             Capital Growth Series
Development Securities Inc.              Dividend Growth Series
Dean Witter Pacific Growth Fund Inc.     Global Equity Series
Dean Witter Precious Metals and          Intermediate Income Securities Series
Minerals Trust                           Liquid Asset Series
Dean Witter Special Value Fund           Strategist Series
Dean Witter S&P 500 Index Fund           U.S. Government Money Market Series
Dean Witter Utilities Fund               U.S. Government Securities Series
Dean Witter Value-Added Market Series    Utilities Series
Dean Witter World Wide Investment Trust  Value-Added Market Series
Morgan Stanley Dean Witter Competitive   ACTIVE ASSETS ACCOUNT PROGRAM
Edge Fund, "BEST IDEAS" PORTFOLIO        Active Assets California Tax-Free Trust
Morgan Stanley Dean Witter Growth Fund   Active Assets Government Securities
Morgan Stanley Dean Witter Mid-Cap       Trust
Dividend Growth Securities               Active Assets Money Trust
ASSET ALLOCATION FUNDS                   Active Assets Tax-Free Trust
Dean Witter Global Asset Allocation
Fund
Dean Witter Strategist Fund
    
<PAGE>
Dean Witter
U.S. Government Securities Trust
Two World Trade Center
New York, New York 10048
 
TRUSTEES
 
   
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Wayne E. Hedien
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
    
 
OFFICERS
 
Charles A. Fiumefreddo
Chairman and Chief Executive Officer
Barry Fink
Vice President, Secretary and
General Counsel
Rajesh K. Gupta
Vice President
Thomas F. Caloia
Treasurer
 
CUSTODIAN
 
The Bank of New York
90 Washington Street
New York, New York 10286
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
 
   
Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
    
 
INDEPENDENT ACCOUNTANTS
 
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
INVESTMENT MANAGER
 
Dean Witter InterCapital Inc.
 
DEAN WITTER
U.S. GOVERNMENT
SECURITIES
TRUST
 
   
                               [PHOTO]
                                                    PROSPECTUS -- APRIL 17, 1998
    
<PAGE>
STATEMENT OF ADDITIONAL INFORMATION
 
   
APRIL 17, 1998                                                     DEAN WITTER
                                                                 U.S. GOVERNMENT
                                                                   SECURITIES
                                                                      TRUST
 
- --------------------------------------------------------------------------------
    
 
    Dean  Witter U.S.  Government Securities Trust  (the "Fund")  is an open-end
diversified management  investment  company  whose investment  objective  is  to
provide  high  current  income consistent  with  safety of  principal.  The Fund
invests only in obligations issued or  guaranteed by the U.S. Government or  its
instrumentalities.  All such obligations are backed by the full faith and credit
of the United States Government.
 
   
    A Prospectus for  the Fund dated  April 17, 1998,  which provides the  basic
information  you  should know  before  investing in  the  Fund, may  be obtained
without charge from the Fund at its address or telephone numbers listed below or
from the Fund's Distributor, Dean Witter Distributors Inc., or from Dean  Witter
Reynolds  Inc.  at  any of  its  branch  offices. This  Statement  of Additional
Information is not a prospectus. It contains information in addition to and more
detailed than that set forth  in the Prospectus. It  is intended to provide  you
additional  information regarding the activities and operations of the Fund, and
should be read in conjunction with the Prospectus.
    
 
   
Dean Witter
U.S. Government Securities Trust
Two World Trade Center
New York, New York 10048
(212) 392-2550
or (800) 869-NEWS (toll-free)
    
<PAGE>
TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
   
<TABLE>
<S>                                                                                      <C>
The Fund and its Management............................................................          3
 
Trustees and Officers..................................................................          7
 
Investment Practices and Policies......................................................         13
 
Investment Restrictions................................................................         14
 
Portfolio Transactions and Brokerage...................................................         14
 
The Distributor........................................................................         16
 
Determination of Net Asset Value.......................................................         20
 
Purchase of Fund Shares................................................................         20
 
Shareholder Services...................................................................         23
 
Redemptions and Repurchases............................................................         28
 
Dividends, Distributions and Taxes.....................................................         29
 
Performance Information................................................................         30
 
Description of Shares of the Fund......................................................         32
 
Custodian and Transfer Agent...........................................................         32
 
Independent Accountants................................................................         33
 
Reports to Shareholders................................................................         33
 
Legal Counsel..........................................................................         33
 
Experts................................................................................         33
 
Registration Statement.................................................................         33
 
Report of Independent Accountants......................................................         34
 
Financial Statements -- December 31, 1997..............................................         35
</TABLE>
    
 
                                       2
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
THE FUND
 
    The  Fund is a Trust of the type commonly known as a "Massachusetts business
trust" and was organized under the laws of the Commonwealth of Massachusetts  on
September 29, 1983.
 
THE INVESTMENT MANAGER
 
    Dean  Witter InterCapital Inc. (the "Investment Manager" or "InterCapital"),
a Delaware corporation, whose address is  Two World Trade Center, New York,  New
York  10048, is  the Fund's Investment  Manager. InterCapital  is a wholly-owned
subsidiary of Morgan Stanley, Dean Witter, Discover & Co. ("MSDWD"), a  Delaware
corporation.  In an internal  reorganization which took  place in January, 1993,
InterCapital assumed  the  investment advisory,  administrative  and  management
activities  previously  performed by  the InterCapital  Division of  Dean Witter
Reynolds  Inc.  ("DWR"),   a  broker-dealer  affiliate   of  InterCapital.   (As
hereinafter  used  in  this  Statement  of  Additional  Information,  the  terms
"InterCapital" and  "Investment Manager"  refer to  DWR's InterCapital  Division
prior   to  the  internal  reorganization  and  Dean  Witter  InterCapital  Inc.
thereafter.) The  daily management  of the  Fund and  research relating  to  the
Fund's portfolio are conducted by or under the direction of officers of the Fund
and of the Investment Manager, subject to periodic review by the Fund's Board of
Trustees.  Information as to these Trustees  and officers is contained under the
caption "Trustees and Officers."
 
    The Investment Manager is  the investment manager  or investment adviser  of
the following investment companies:
 
OPEN-END FUNDS
 
   
<TABLE>
<C>        <S>
       1.  Active Assets California Tax-Free Trust
       2.  Active Assets Government Securities
            Trust
       3.  Active Assets Money Trust
       4.  Active Assets Tax-Free Trust
       5.  Dean Witter American Value Fund
       6.  Dean Witter Balanced Growth Fund
       7.  Dean Witter Balanced Income Fund
       8.  Dean Witter California Tax-Free Daily
            Income Trust
       9.  Dean Witter California Tax-Free Income
            Fund
      10.  Dean Witter Capital Appreciation Fund
      11.  Dean Witter Capital Growth Securities
      12.  Dean Witter Convertible Securities Trust
      13.  Dean Witter Developing Growth Securities
            Trust
      14.  Dean Witter Diversified Income Trust
      15.  Dean Witter Dividend Growth Securities
            Inc.
      16.  Dean Witter European Growth Fund Inc.
      17.  Dean Witter Federal Securities Trust
      18.  Dean Witter Financial Services Trust
      19.  Dean Witter Fund of Funds
      20.  Dean Witter Global Asset Allocation Fund
      21.  Dean Witter Global Dividend Growth
            Securities
      22.  Dean Witter Global Short-Term Income
            Fund Inc.
      23.  Dean Witter Global Utilities Fund
      24.  Dean Witter Hawaii Municipal Trust
      25.  Dean Witter Health Sciences Trust
      26.  Dean Witter High Yield Securities Inc.
      27.  Dean Witter Income Builder Fund
      28.  Dean Witter Information Fund
      29.  Dean Witter Intermediate Income
            Securities
      30.  Dean Witter Intermediate Term U.S.
            Treasury Trust
      31.  Dean Witter International SmallCap Fund
      32.  Dean Witter Japan Fund
      33.  Dean Witter Limited Term Municipal Trust
      34.  Dean Witter Liquid Asset Fund Inc.
      35.  Dean Witter Market Leader Trust
      36.  Dean Witter Mid-Cap Growth Fund
      37.  Dean Witter Multi-State Municipal Series
            Trust
      38.  Dean Witter Natural Resource Development
            Securities Inc.
      39.  Dean Witter New York Municipal Money
            Market Trust
      40.  Dean Witter New York Tax-Free Income
            Fund
      41.  Dean Witter Pacific Growth Fund Inc.
      42.  Dean Witter Precious Metals and Minerals
            Trust
      43.  Dean Witter Retirement Series
      44.  Dean Witter Select Dimensions Investment
            Series
</TABLE>
    
 
                                       3
<PAGE>
   
<TABLE>
<C>        <S>
      45.  Dean Witter Select Municipal
            Reinvestment Fund
      46.  Dean Witter Short-Term Bond Fund
      47.  Dean Witter Short-Term U.S. Treasury
            Trust
      48.  Dean Witter Special Value Fund
      49.  Dean Witter S&P 500 Index Fund
      50.  Dean Witter Strategist Fund
      51.  Dean Witter Tax-Exempt Securities Trust
      52.  Dean Witter Tax-Free Daily Income Trust
      53.  Dean Witter U.S. Government Money Market
            Trust
      54.  Dean Witter U.S. Government Securities
            Trust
      55.  Dean Witter Utilities Fund
      56.  Dean Witter Value-Added Market Series
      57.  Dean Witter Variable Investment Series
      58.  Dean Witter World Wide Income Trust
      59.  Dean Witter World Wide Investment Trust
      60.  Morgan Stanley Dean Witter Competitive
            Edge Funds "BEST IDEAS" PORTFOLIO
      61.  Morgan Stanley Dean Witter Growth Fund
      62.  Morgan Stanley Dean Witter Mid-Cap
            Dividend Growth Securities
</TABLE>
    
 
CLOSED-END FUNDS
 
<TABLE>
<C>        <S>
       1.  High Income Advantage Trust
       2.  High Income Advantage Trust II
       3.  High Income Advantage Trust III
       4.  InterCapital Income Securities Inc.
       5.  Dean Witter Government Income Trust
       6.  InterCapital Insured Municipal Bond
            Trust
       7.  InterCapital Insured Municipal Trust
       8.  InterCapital Insured Municipal Income
            Trust
       9.  InterCapital California Insured
            Municipal Income Trust
      10.  InterCapital Insured Municipal
            Securities
      11.  InterCapital Insured California
            Municipal Securities
      12.  InterCapital Quality Municipal
            Investment Trust
      13.  InterCapital Quality Municipal Income
            Trust
      14.  InterCapital Quality Municipal
            Securities
      15.  InterCapital California Quality
            Municipal Securities
      16.  InterCapital New York Quality Municipal
            Securities
      17.  Municipal Income Trust
      18.  Municipal Income Trust II
      19.  Municipal Income Trust III
      20.  Municipal Income Opportunities Trust
      21.  Municipal Income Opportunities II
      22.  Municipal Income Opportunities III
      23.  Prime Income Trust
      24.  Municipal Premium Income Trust
</TABLE>
 
    The foregoing investment companies, together with the Fund, are collectively
referred to as the Dean Witter Funds.
 
    In  addition,  Dean Witter  Services Company  Inc. ("DWSC"),  a wholly-owned
subsidiary of InterCapital, serves  as manager for  the following companies  for
which TCW Funds Management, Inc. is the investment adviser (the "TCW/DW Funds"):
 
   
<TABLE>
<C>        <S>
OPEN-END FUNDS
       1.  TCW/DW North American Government Income
            Trust
       2.  TCW/DW Latin American Growth Fund
       3.  TCW/DW Income and Growth Fund
       4.  TCW/DW Small Cap Growth Fund
       5.  TCW/DW Mid-Cap Equity Trust
       6.  TCW/DW Global Telecom Trust
       7.  TCW/DW Emerging Markets Opportunities
            Trust
 
CLOSED-END FUNDS
       8.  TCW/DW Term Trust 2000
       9.  TCW/DW Term Trust 2002
      10.  TCW/DW Term Trust 2003
      11.  TCW/DW Total Return Trust
</TABLE>
    
 
   
    InterCapital  also serves as:  (i) administrator of  The BlackRock Strategic
Term Trust  Inc., a  closed-end investment  company; (ii)  sub-administrator  of
Templeton  Global Governments Income Trust, a closed-end investment company; and
(iii)   investment   adviser    of   Offshore   Dividend    Growth   Fund    and
    
 
                                       4
<PAGE>
   
Offshore  Money  Market Fund,  mutual funds  established under  the laws  of the
Cayman Islands and  available only to  investors who are  participants in  DWR's
International  Active  Assets  Account  program  and  are  neither  citizens nor
residents of the United States.
    
 
    Pursuant to an  Investment Management Agreement  (the "Agreement") with  the
Investment  Manager, the Fund has retained  the Investment Manager to manage the
investment of  the  Fund's assets,  including  the  placing of  orders  for  the
purchase  and sale of  portfolio securities. The  Investment Manager obtains and
evaluates such  information  and  advice relating  to  the  economy,  securities
markets,  and  specific  securities  as  it  considers  necessary  or  useful to
continuously manage  the assets  of the  Fund in  a manner  consistent with  its
investment objective and policies.
 
    Under  the  terms  of the  Agreement,  in  addition to  managing  the Fund's
investments, the Investment Manager  maintains certain of  the Fund's books  and
records  and  furnishes,  at its  own  expense, such  office  space, facilities,
equipment, clerical help, bookkeeping and certain legal services as the Fund may
reasonably require in the conduct of its business, including the preparation  of
prospectuses, proxy statements and reports required to be filed with federal and
state  securities commissions (except insofar as the participation or assistance
of independent accountants and  attorneys is, in the  opinion of the  Investment
Manager,  necessary or desirable). In addition,  the Investment Manager pays the
salaries of all personnel, including officers of the Fund, who are employees  of
the  Investment Manager. The Investment Manager also bears the cost of telephone
service, heat, light, power and other utilities provided to the Fund.
 
    Effective December  31,  1993,  pursuant to  a  Services  Agreement  between
InterCapital  and DWSC, DWSC began to provide the administrative services to the
Fund which  were previously  performed directly  by InterCapital.  On April  17,
1995,  DWSC was  reorganized in the  State of Delaware,  necessitating the entry
into a  new  Services Agreement  by  InterCapital and  DWSC  on that  date.  The
foregoing internal reorganizations did not result in any change in the nature or
scope  of the administrative services  being provided to the  Fund or any of the
fees being paid by the Fund for  the overall services being performed under  the
terms of the existing Management Agreement.
 
   
    Expenses not expressly assumed by the Investment Manager under the Agreement
or  by  the Distributor  of  the Fund's  shares,  Dean Witter  Distributors Inc.
("Distributors" or the "Distributor") (see  "The Distributor"), will be paid  by
the  Fund. These expenses will be allocated  among the four classes of shares of
the Fund  (each, a  "Class")  pro rata  based  on the  net  assets of  the  Fund
attributable  to each Class,  except as described  below. Such expenses include,
but are not limited to:  expenses of the Plan  of Distribution pursuant to  Rule
12b-1  (the "12b-1  fee") (see "The  Distributor"); charges and  expenses of any
registrar, custodian, stock  transfer and dividend  disbursing agent;  brokerage
commissions;  taxes;  engraving  and printing  share  certificates; registration
costs of the Fund and  its shares under federal  and state securities laws;  the
cost   and  expense   of  printing,  including   typesetting,  and  distributing
prospectuses  and  statements  of  additional   information  of  the  Fund   and
supplements  thereto to the  Fund's shareholders; all  expenses of shareholders'
and  Trustees'  meetings  and  of  preparing,  printing  and  mailing  of  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  Manager or  any corporate affiliate  of the  Investment Manager; all
expenses incident to any dividend, withdrawal or redemption options; charges and
expenses of any outside service used for pricing of the Fund's shares; fees  and
expenses  of  legal  counsel, including  counsel  to  the Trustees  who  are not
interested persons  of the  Fund or  of the  Investment Manager  (not  including
compensation  or  expenses  of attorneys  who  are employees  of  the Investment
Manager) and independent accountants; membership dues of industry  associations;
interest  on  Fund  borrowings;  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 relating thereto); and
all other costs of the Fund's operation. The 12b-1 fees relating to a particular
Class will be  allocated directly  to that  Class. In  addition, other  expenses
associated with a particular Class (except
    
 
                                       5
<PAGE>
advisory  or custodial fees)  may be allocated directly  to that Class, provided
that such expenses  are reasonably  identified as  specifically attributable  to
that Class and the direct allocation to that Class is approved by the Trustees.
 
   
    As  full compensation for the services  and facilities furnished to the Fund
and expenses of the Fund  assumed by the Investment  Manager, the Fund pays  the
Investment  Manager  monthly  compensation  calculated  daily  by  applying  the
following annual rates to the Fund's daily net assets pursuant to the Agreement:
0.50% of the portion of such daily  net assets not exceeding $1 billion;  0.475%
of  the portion of such daily net  assets exceeding $1 billion but not exceeding
$1.5 billion;  0.45% of  the portion  of such  daily net  assets exceeding  $1.5
billion  but not exceeding $2  billion; 0.425% of the  portion of such daily net
assets exceeding  $2 billion  but  not exceeding  $2.5  billion; 0.40%  of  that
portion  of such daily  net assets exceeding  $2.5 billion but  not exceeding $5
billion; 0.375% of that  portion of such daily  net assets exceeding $5  billion
but  not exceeding $7.5 billion; 0.35% of  that portion of such daily net assets
exceeding $7.5 billion but not exceeding $10 billion; 0.325% of that portion  of
such daily net assets exceeding $10 billion but not exceeding $12.5 billion; and
0.30%  of that  portion of  such daily net  assets exceeding  $12.5 billion. The
management fee is allocated among the Classes  pro rata based on the net  assets
of  the Fund attributable to each Class. For the fiscal years ended December 31,
1995,  1996  and  1997,  the  Fund  accrued  to  the  Investment  Manager  total
compensation of $33,295,918, $29,579,546 and $24,916,951, respectively.
    
 
    The  Agreement  provides that  in the  absence  of willful  misfeasance, bad
faith, gross negligence or reckless disregard of its obligations thereunder, the
Investment Manager is not liable to the Fund or any of its investors for any act
or omission by the Investment Manager or for any losses sustained by the Fund or
its investors.  The Agreement  does  not restrict  the Investment  Manager  from
acting as investment manager or adviser to others.
 
    The  Agreement was initially  approved by the Trustees  on February 21, 1997
and by the shareholders of the Fund at a Special Meeting of Shareholders held on
May 21, 1997.  The Agreement is  substantially identical to  a prior  investment
management agreement which was initially approved by the Trustees on October 30,
1992  and by the shareholders  of the Fund at  a Special Meeting of Shareholders
held on January 12,  1993. The Agreement  took effect on May  31, 1997 upon  the
consummation  of the merger of  Dean Witter, Discover &  Co. with Morgan Stanley
Group Inc. The  Agreement may  be terminated at  any time,  without penalty,  on
thirty  days' notice by the Board  of Trustees of the Fund,  by the holders of a
majority, as defined in the Investment Company  Act of 1940 (the "Act"), of  the
outstanding shares of the Fund, or by the Investment Manager. The Agreement will
automatically terminate in the event of its assignment (as defined in the Act).
 
   
    Under its terms, the Agreement has an initial term ending April 30, 1999 and
will  remain in effect from year to year thereafter, provided continuance of the
Agreement is approved at least annually by the vote of the holders of a majority
(as defined in the Act) of the outstanding  shares of the Fund, or by the  Board
of  Trustees of  the Fund;  provided that  in either  event such  continuance is
approved annually by the vote of a majority of the Trustees of the Fund who  are
not  parties to the Agreement or "interested persons" (as defined in the Act) of
any such party (the "Independent Trustees"),  which vote must be cast in  person
at a meeting called for the purpose of voting on such approval.
    
 
   
    The  following owned 5% or more of the  outstanding shares of Class A of the
Fund on April 1, 1998: Harold D. Rogers as Executor, Estate of Frank L.  Broday,
725  Hamilton  Building,  Wichita  Falls,  TX  76301--10.308%.  Meridian Charter
Township, Attention Thomas E. Klunzinger Treasurer, 5151 Marsh Road, Okemos,  MI
48864-1104--8.348%.  The following owned 5% or more of the outstanding shares of
Class C of  the Fund on  April 1, 1998,  James Kaney and  Julia A. Kaney,  14347
Coffman  Rd,  Forreston,  IL  61030-9311--14.156%.  Meridian  Charter  Township,
Attention  Thomas  E.   Klunzinger  Treasurer,  5151   March  Road,  Okemos   MI
48864-1104--6.69%.  The following owned 25% or more of the outstanding shares of
Class D of the Fund on  April 1, 1998: Mac &  Co A/C DWRF 82523652, Mellon  Bank
N.A., Mutual Fund Operations, PO Box 3198, Pittsburgh PA 15230-3198--95.124%.
    
 
                                       6
<PAGE>
    The Fund has acknowledged that the name "Dean Witter" is a property right of
DWR. The Fund has agreed that DWR or its parent company may use or, at any time,
permit  others to use, the name "Dean Witter."  The Fund has also agreed that in
the  event  the  Agreement  is   terminated,  or  if  the  affiliation   between
InterCapital  and its parent company is  terminated, the Fund will eliminate the
name "Dean Witter" from its name if DWR or its parent company shall so request.
 
TRUSTEES AND OFFICERS
- --------------------------------------------------------------------------------
 
   
    The Trustees and Executive  Officers of the  Fund, their principal  business
occupations  during the  last five  years and  their affiliations,  if any, with
InterCapital and with the 86 Dean Witter Funds and the 11 TCW/DW Funds are shown
below.
    
 
   
<TABLE>
<CAPTION>
   NAME, AGE, POSITION WITH FUND AND
                ADDRESS                                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ----------------------------------------  ----------------------------------------------------------------------
<S>                                       <C>
Michael Bozic (57)                        Chairman and Chief Executive  Officer of Levitz Furniture  Corporation
Trustee                                   (since  November, 1995); Director or Trustee of the Dean Witter Funds;
c/o Levitz Furniture Corporation          formerly President  and Chief  Executive Officer  of Hills  Department
7887 N. Federal Hwy.                      Stores  (May,  1991-July,  1995); formerly  variously  Chairman, Chief
Boca Raton, Florida                       Executive  Officer,  and   President  and   Chief  Operating   Officer
                                          (1987-1991)  of the Sears Merchandise Group of Sears, Roebuck and Co.;
                                          Director of  Eaglemark  Financial  Services, Inc.  and  Weirton  Steel
                                          Corporation.
 
Charles A. Fiumefreddo* (64)              Chairman,  Chief Executive Officer and  Director of InterCapital, DWSC
Chairman of the Board, President,         and Distributors;  Executive  Vice  President  and  Director  of  DWR;
Chief Executive Officer and Trustee       Chairman,  Director or Trustee, President  and Chief Executive Officer
Two World Trade Center                    of the  Dean  Witter  Funds; Chairman,  Chief  Executive  Officer  and
New York, New York                        Trustee  of the TCW/DW Funds; Chairman  and Director of Morgan Stanley
                                          Dean Witter  Trust  FSB ("MSDW  Trust");  Director and/or  officer  of
                                          various MSDW subsidiaries.
 
Edwin J. Garn (65)                        Director  or Trustee of the Dean  Witter Funds; formerly United States
Trustee                                   Senator (R-Utah) (1974-1992)  and Chairman,  Senate Banking  Committee
c/o Huntsman Corporation                  (1980-1986);  formerly  Mayor  of Salt  Lake  City,  Utah (1971-1974);
500 Huntsman Way                          formerly Astronaut, Space Shuttle Discovery (April 12-19, 1985);  Vice
Salt Lake City, Utah                      Chairman,  Huntsman  Corporation;  Director  of  Franklin  Covey (time
                                          management systems), John  Alden Financial  Corp. (health  insurance),
                                          United  Space Alliance (joint venture  between Lockheed Martin and the
                                          Boeing Company) and Nuskin Asia Pacific (multilevel marketing); member
                                          of the board of various civic and charitable organizations.
</TABLE>
    
 
                                       7
<PAGE>
   
<TABLE>
<CAPTION>
   NAME, AGE, POSITION WITH FUND AND
                ADDRESS                                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ----------------------------------------  ----------------------------------------------------------------------
<S>                                       <C>
John R. Haire (73)                        Chairman of the Audit Committee and  Chairman of the Committee of  the
Trustee                                   Independent  Directors or Trustees and Director or Trustee of the Dean
Two World Trade Center                    Witter Funds;  Chairman of  the Audit  Committee and  Chairman of  the
New York, New York                        Committee of the Independent Trustees and Trustee of the TCW/DW Funds;
                                          formerly  President,  Council  for Aid  to  Education  (1978-1989) and
                                          Chairman  and  Chief  Executive  Officer  of  Anchor  Corporation,  an
                                          Investment Adviser (1964-1978).
 
Wayne E. Hedien (63)                      Retired; Director or Trustee of the Dean Witter Funds; Director of The
Trustee                                   PMI  Group,  Inc.  (private  mortgage  insurance);  Trustee  and  Vice
c/o Gordon Altman Butowsky                Chairman of The Field Museum  of Natural History; formerly  associated
 Weitzen Shalov & Wein                    with  the Allstate Companies (1966-1994), most recently as Chairman of
Counsel to the Independent Trustees       The Allstate Corporation (March, 1993-December, 1994) and Chairman and
114 West 47th Street                      Chief Executive  Officer  of  its  wholly-owned  subsidiary,  Allstate
New York, New York                        Insurance  Company  (July, 1989-December,  1994); director  of various
                                          other business and charitable organizations.
 
Dr. Manuel H. Johnson (49)                Senior Partner, Johnson Smick International, Inc., a consulting  firm;
Trustee                                   Co-Chairman  and a  founder of  the Group  of Seven  Council (G7C), an
c/o Johnson Smick International, Inc.     international economic  commission; Director  or Trustee  of the  Dean
1133 Connecticut Avenue, N.W.             Witter  Funds; Trustee of the TCW/DW  Funds; Director of NASDAQ (since
Washington, DC                            June,   1995);   Director   of   Greenwich   Capital   Markets,   Inc.
                                          (broker-dealer)  and NVR, Inc. (home construction); Chairman and Trus-
                                          tee of the Financial Accounting Foundation (oversight organization  of
                                          the  Financial Accounting Standards Board);  formerly Vice Chairman of
                                          the Board of Governors of  the Federal Reserve System (1986-1990)  and
                                          Assistant Secretary of the U.S. Treasury (1982-1986).
 
Michael E. Nugent (61)                    General   Partner,   Triumph  Capital,   LP.,  a   private  investment
Trustee                                   partnership; Director or Trustee of the Dean Witter Funds; Trustee  of
c/o Triumph Capital, L.P.                 the  TCW/DW Funds; formerly Vice  President, Bankers Trust Company and
237 Park Avenue                           BT Capital  Corporation  (1984-1988);  Director  of  various  business
New York, New York                        organizations.
 
Philip J. Purcell* (54)                   Chairman  of the  Board of  Directors and  Chief Executive  Officer of
Trustee                                   MSDW, DWR and  Novus Credit Services  Inc.; Director of  InterCapital,
1585 Broadway                             DWSC  and Distributors; Director or Trustee  of the Dean Witter Funds;
New York, New York                        Director and/or officer of various MSDW subsidiaries.
</TABLE>
    
 
                                       8
<PAGE>
   
<TABLE>
<CAPTION>
   NAME, AGE, POSITION WITH FUND AND
                ADDRESS                                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ----------------------------------------  ----------------------------------------------------------------------
<S>                                       <C>
John L. Schroeder (67)                    Retired; Director or Trustee of the Dean Witter Funds; Trustee of  the
Trustee                                   TCW/DW   Funds;  Director  of  Citizens  Utilities  Company;  formerly
c/o Gordon Altman Butowsky                Executive Vice  President and  Chief Investment  Officer of  the  Home
 Weitzen Shalov & Wein                    Insurance Company (August, 1991-September, 1995).
Counsel to the Independent Trustees
114 West 47th Street
New York, New York
 
Barry Fink (43)                           Senior  Vice President (since  March, 1997) and  Secretary and General
Vice President, Secretary                 Counsel (since February, 1997) of  InterCapital and DWSC; Senior  Vice
  and General Counsel                     President  (since March,  1997) and Assistant  Secretary and Assistant
Two World Trade Center                    General Counsel  (since  February, 1997)  of  Distributors;  Assistant
New York, New York                        Secretary  of DWR (since August,  1996); Vice President, Secretary and
                                          General Counsel of the Dean Witter Funds and the TCW/ DW Funds  (since
                                          February, 1997); previously First Vice President (June, 1993-February,
                                          1997),  Vice President (until June,  1993) and Assistant Secretary and
                                          Assistant General  Counsel  of  InterCapital and  DWSC  and  Assistant
                                          Secretary of the Dean Witter Funds and the TCW/DW Funds.
 
Rajesh K. Gupta (38)                      Senior  Vice President of InterCapital; Vice President of various Dean
Vice President                            Witter Funds.
Two World Trade Center
New York, New York
 
Thomas F. Caloia (52)                     First Vice President and Assistant Treasurer of InterCapital and DWSC;
Treasurer                                 Treasurer of the Dean Witter Funds and the TCW/DW Funds.
Two World Trade Center
New York, New York
</TABLE>
    
 
- ------------
 *Denotes Trustees who are "interested persons"  of the Fund, as defined in  the
  Act.
 
   
    In  addition, Mitchell  M. Merin, President  and Chief  Strategic Officer of
InterCapital and DWSC, Executive Vice  President of Distributors and MSDW  Trust
and  Director  of  MSDW  Trust, Executive  Vice  President  Chief Administrative
Officer and Director of  DWR, Robert M. Scanlan,  President and Chief  Operating
Officer  of InterCapital and DWSC, Executive  Vice President of Distributors and
MSDW Trust  and Director  of MSDW  Trust, Joseph  J. McAlinden,  Executive  Vice
President  and Chief  Investment Officer  of InterCapital  and Director  of MSDW
Trust, Robert  S.  Giambrone,  Senior  Vice  President  of  InterCapital,  DWSC,
Distributors  and MSDW Trust, and  Director of MSDW Trust,  and Peter M. Avelar,
Kevin Hurley and Jonathan R. Page,  Senior Vice Presidents of InterCapital,  and
Joseph R. Arcieri, Gerard J. Lian and Katherine H. Stromberg, Vice Presidents of
InterCapital,  are Vice Presidents of the Fund. In addition, Marilyn K. Cranney,
First Vice President and Assistant General Counsel of InterCapital and DWSC, Lou
Anne D. McInnis,  Carsten Otto  and Ruth  Rossi, Vice  Presidents and  Assistant
General  Counsels of InterCapital and DWSC, and Frank Bruttomesso and Todd Lebo,
staff attorneys with InterCapital, are Assistant Secretaries of the Fund.
    
 
THE BOARD OF TRUSTEES, THE INDEPENDENT TRUSTEES, AND THE COMMITTEES
 
   
    The Board of Trustees consists of nine (9) trustees. These same  individuals
also  serve as directors or  trustees for all of the  Dean Witter Funds, and are
referred   to    in   this    section   as    Trustees.   As    of   the    date
    
 
                                       9
<PAGE>
   
of this Statement of Additional Information, there are a total of 86 Dean Witter
Funds,  comprised of 130 portfolios. As of March 31, 1998, the Dean Witter Funds
had total net assets of approximately  $105.3 billion and more than six  million
shareholders.
    
 
   
    Seven  Trustees (77%  of the total  number) have no  affiliation or business
connection with InterCapital or any of its affiliated persons and do not own any
stock or other securities issued by InterCapital's parent company, MSDWD.  These
are  the "disinterested" or "independent" Trustees.  The other two Trustees (the
"management Trustees")  are  affiliated with  InterCapital.  Four of  the  seven
independent Trustees are also Independent Trustees of the TCW/DW Funds.
    
 
   
    Law and regulation establish both general guidelines and specific duties for
the  Independent Trustees.  The Dean Witter  Funds seek  as Independent Trustees
individuals of distinction  and experience in  business and finance,  government
service  or academia; these are people whose advice and counsel are in demand by
others and for  whom there is  often competition.  To accept a  position on  the
Funds'  Boards, such individuals may reject other attractive assignments because
the Funds make  substantial demands  on their time.  Indeed, by  serving on  the
Funds'  Boards, certain Trustees who would  otherwise be qualified and in demand
to serve on bank boards would be prohibited by law from doing so.
    
 
   
    All of the Independent Trustees serve as members of the Audit Committee  and
the  Committee of the Independent Trustees. Three  of them also serve as members
of the Derivatives Committee. During the calendar year ended December 31,  1997,
the three Committees held a combined total of seventeen meetings. The Committees
hold  some  meetings at  InterCapital's offices  and some  outside InterCapital.
Management Trustees or  officers do not  attend these meetings  unless they  are
invited for purposes of furnishing information or making a report.
    
 
   
    The  Committee of the  Independent Trustees is  charged with recommending to
the full Board  approval of management,  advisory and administration  contracts,
Rule  12b-1  plans  and distribution  and  underwriting  agreements; continually
reviewing Fund performance;  checking on  the pricing  of portfolio  securities,
brokerage  commissions, transfer agent costs  and performance, and trading among
Funds in the  same complex; and  approving fidelity bond  and related  insurance
coverage and allocations, as well as other matters that arise from time to time.
The Independent Trustees are required to select and nominate individuals to fill
any  Independent Trustee vacancy on the Board of  any Fund that has a Rule 12b-1
plan of distribution. Most of the Dean Witter Funds have such a plan.
    
 
   
    The Audit  Committee is  charged with  recommending to  the full  Board  the
engagement  or  discharge  of  the  Fund's  independent  accountants;  directing
investigations into matters  within the  scope of  the independent  accountants'
duties,  including the power  to retain outside  specialists; reviewing with the
independent accountants the audit plan  and results of the auditing  engagement;
approving  professional  services provided  by  the independent  accountants and
other accounting firms prior to the performance of such services; reviewing  the
independence  of the independent accountants; considering the range of audit and
non-audit fees;  reviewing  the  adequacy  of  the  Fund's  system  of  internal
controls;  and preparing  and submitting Committee  meeting minutes  to the full
Board.
    
 
   
    Finally, the  Board of  each  Fund has  formed  a Derivatives  Committee  to
establish  parameters for and oversee the activities of the Fund with respect to
derivative investments, if any, made by the Fund.
    
 
   
DUTIES OF CHAIRMAN OF COMMITTEE OF THE INDEPENDENT TRUSTEES AND AUDIT COMMITTEE
    
 
   
    The Chairman of  the Committee  of the  Independent Trustees  and the  Audit
Committee  maintains an  office at  the Funds' headquarters  in New  York. He is
responsible for keeping abreast of regulatory and industry developments and  the
Funds'  operations and management. He  screens and/or prepares written materials
and identifies  critical  issues  for  the  Independent  Trustees  to  consider,
develops  agendas  for Committee  meetings, determines  the  type and  amount of
information that the Committees will need to form a judgment on various  issues,
and  arranges to have  that information furnished to  Committee members. He also
arranges for  the services  of independent  experts and  consults with  them  in
    
 
                                       10
<PAGE>
   
advance  of meetings  to help  refine reports and  to focus  on critical issues.
Members of the Committees believe that the person who serves as Chairman of both
Committees and guides their efforts is  pivotal to the effective functioning  of
the Committees.
    
 
   
    The  Chairman of the  Committees also maintains  continuous contact with the
Funds' management, with independent counsel to the Independent Trustees and with
the Funds' independent auditors.  He arranges for a  series of special  meetings
involving  the  annual  review  of  investment  advisory,  management  and other
operating contracts of  the Funds  and, on  behalf of  the Committees,  conducts
negotiations with the Investment Manager and other service providers. In effect,
the  Chairman of the Committees  serves as a combination  of chief executive and
support staff of the Independent Trustees.
    
 
   
    The Chairman of  the Committee  of the  Independent Trustees  and the  Audit
Committee  is  not  employed by  any  other  organization and  devotes  his time
primarily to  the services  he performs  as Committee  Chairman and  Independent
Trustee  of the Dean Witter Funds and  as an Independent Trustee and as Chairman
of the Committee  of the  Independent Trustees and  the Audit  Committee of  the
    
   
TCW/DW  Funds.  The  current  Committee  Chairman has  had  more  than  35 years
experience as a senior executive in the investment company industry.
    
 
   
ADVANTAGES OF HAVING SAME INDIVIDUALS AS INDEPENDENT TRUSTEES FOR ALL DEAN
WITTER FUNDS
    
 
   
    The Independent Trustees and the  Funds' management believe that having  the
same  Independent  Trustees  for  each  of  the  Dean  Witter  Funds  avoids the
duplication  of  effort  that  would  arise  from  having  different  groups  of
individuals  serving as Independent  Trustees for each  of the Funds  or even of
sub-groups of Funds.  They believe  that having  the same  individuals serve  as
Independent  Trustees of  all the  Funds tends  to increase  their knowledge and
expertise regarding matters which affect the Fund complex generally and enhances
their ability  to negotiate  on behalf  of  each Fund  with the  Fund's  service
providers. This arrangement also precludes the possibility of separate groups of
Independent  Trustees arriving at conflicting decisions regarding operations and
management of the  Funds and  avoids the cost  and confusion  that would  likely
ensue.  Finally, having the  same Independent Trustees serve  on all Fund Boards
enhances the ability of  each Fund to  obtain, at modest  cost to each  separate
Fund,  the services of Independent Trustees, and a Chairman of their Committees,
of the caliber, experience and business  acumen of the individuals who serve  as
Independent Trustees of the Dean Witter Funds.
    
 
COMPENSATION OF INDEPENDENT TRUSTEES
 
   
    The  Fund pays  each Independent Trustee  an annual  fee of $800  plus a per
meeting fee of $50 for  meetings of the Board of  Trustees or committees of  the
Board  of Trustees attended  by the Trustee  (the Fund pays  the Chairman of the
Audit Committee an annual fee of $750 and pays the Chairman of the Committee  of
the Independent Trustees an additional annual fee of $1,200). If a Board meeting
and  a Committee meeting,  or more than  one Committee meeting,  take place on a
single day, the Trustees  are paid a  single meeting fee by  the Fund. The  Fund
also  reimburses  such  Trustees  for travel  and  other  out-of-pocket expenses
incurred by  them  in connection  with  attending such  meetings.  Trustees  and
officers  of the Fund who are or have been employed by the Investment Manager or
an affiliated company receive no compensation or expense reimbursement from  the
Fund.
    
 
   
    The  following  table  illustrates  the  compensation  paid  to  the  Fund's
Independent Trustees by the Fund for the fiscal year ended December 31, 1997.
    
 
   
                               FUND COMPENSATION
    
 
   
<TABLE>
<CAPTION>
                                                                   AGGREGATE
                                                                 COMPENSATION
NAME OF INDEPENDENT TRUSTEE                                      FROM THE FUND
- --------------------------------------------------------------  ---------------
<S>                                                             <C>
Michael Bozic.................................................      $1,650
Edwin J. Garn.................................................       1,850
John R. Haire.................................................       3,800
Wayne E. Hedien...............................................         482
Dr. Manuel H. Johnson.........................................       1,800
Michael E. Nugent.............................................       1,850
John L. Schroeder.............................................       1,850
</TABLE>
    
 
                                       11
<PAGE>
   
    The  following  table  illustrates  the  compensation  paid  to  the  Fund's
Independent  Trustees for the calendar year ended December 31, 1997 for services
to the 84 Dean Witter Funds and,  in the case of Messrs. Haire, Johnson,  Nugent
and  Schroeder, the 14 TCW/DW Funds that were in operation at December 31, 1997.
With respect to Messrs. Haire, Johnson,  Nugent and Schroeder, the TCW/DW  Funds
are  included solely because of a limited exchange privilege between those Funds
and five  Dean Witter  Money Market  Funds.  Mr. Hedien's  term as  Director  or
Trustee of each Dean Witter Fund commenced on September 1, 1997.
    
 
   
           CASH COMPENSATION FROM DEAN WITTER FUNDS AND TCW/DW FUNDS
    
 
   
<TABLE>
<CAPTION>
                                                                   FOR SERVICE AS    FOR SERVICE
                                                                    CHAIRMAN OF          AS
                                                                   COMMITTEES OF     CHAIRMAN OF      TOTAL CASH
                               FOR SERVICE                          INDEPENDENT     COMMITTEES OF    COMPENSATION
                              AS DIRECTOR OR                         DIRECTORS/      INDEPENDENT     FOR SERVICES
                               TRUSTEE AND       FOR SERVICE AS     TRUSTEES AND    TRUSTEES AND          TO
                             COMMITTEE MEMBER     TRUSTEE AND          AUDIT            AUDIT       84 DEAN WITTER
                                OF 84 DEAN      COMMITTEE MEMBER   COMMITTEES OF    COMMITTEES OF     FUNDS AND
NAME OF                           WITTER          OF 14 TCW/DW     84 DEAN WITTER     14 TCW/DW       14 TCW/DW
INDEPENDENT TRUSTEE               FUNDS              FUNDS             FUNDS            FUNDS           FUNDS
- ---------------------------  ----------------   ----------------   --------------   -------------   --------------
<S>                          <C>                <C>                <C>              <C>             <C>
Michael Bozic..............      $133,602           --                 --               --             $133,602
Edwin J. Garn..............       149,702           --                 --               --              149,702
John R. Haire..............       149,702           $73,725           $157,463         $25,350          406,240
Wayne E. Hedien............        39,010           --                 --               --               39,010
Dr. Manuel H. Johnson......       145,702            71,125            --               --              216,827
Michael E. Nugent..........       149,702            73,725            --               --              223,427
John L. Schroeder..........       149,702            73,725            --               --              223,427
</TABLE>
    
 
   
    As  of the date of this Statement  of Additional Information, 57 of the Dean
Witter Funds, including the Fund, have adopted a retirement program under  which
an  Independent Trustee who  retires after serving  for at least  five years (or
such lesser period as may be determined by the Board) as an Independent Director
or Trustee of any Dean Witter Fund that has adopted the retirement program (each
such Fund referred to as an "Adopting Fund" and each such Trustee referred to as
an "Eligible  Trustee") is  entitled to  retirement payments  upon reaching  the
eligible  retirement age (normally, after attaining age 72). Annual payments are
based upon length of service. Currently, upon retirement, each Eligible  Trustee
is  entitled to  receive from  the Adopting  Fund, commencing  as of  his or her
retirement date and continuing for the remainder  of his or her life, an  annual
retirement benefit (the "Regular Benefit") equal to 25.0% of his or her Eligible
Compensation  plus 0.4166666% of such Eligible  Compensation for each full month
of service as an Independent Director or Trustee of any Adopting Fund in  excess
of five years up to a maximum of 50.0% after ten years of service. The foregoing
percentages may be changed by the Board.(1) "Eligible Compensation" is one-fifth
of  the total compensation  earned by such  Eligible Trustee for  service to the
Adopting Fund  in  the five  year  period prior  to  the date  of  the  Eligible
Trustee's  retirement. Benefits under the retirement  program are not secured or
funded by the Adopting Funds.
    
 
   
    The following  table  illustrates the  retirement  benefits accrued  to  the
Fund's  Independent Trustees by the Fund for  the fiscal year ended December 31,
1997 and by the  57 Dean Witter  Funds (including the Fund)  for the year  ended
December  31,  1997,  and  the  estimated  retirement  benefits  for  the Fund's
Independent Trustees, to  commence upon their  retirement, from the  Fund as  of
December 31, 1997 and from the 57 Dean Witter Funds as of December 31, 1997.
    
 
- ------------
   
(1) An  Eligible Trustee may  elect alternate payments of  his or her retirement
    benefits based upon the  combined life expectancy  of such Eligible  Trustee
    and his or her spouse on the date of such Eligible Trustee's retirement. The
    amount  estimated to be payable under  this method, through the remainder of
    the later of  the lives of  such Eligible  Trustee and spouse,  will be  the
    actuarial  equivalent  of the  Regular  Benefit. In  addition,  the Eligible
    Trustee may elect that the  surviving spouse's periodic payment of  benefits
    will  be equal  to either 50%  or 100%  of the previous  periodic amount, an
    election that, respectively,  increases or decreases  the previous  periodic
    amount  so that the  resulting payments will be  the actuarial equivalent of
    the Regular Benefit.
    
 
                                       12
<PAGE>
   
          RETIREMENT BENEFITS FROM THE FUND AND ALL DEAN WITTER FUNDS
    
 
   
<TABLE>
<CAPTION>
                                  FOR ALL ADOPTING FUNDS          RETIREMENT
                                ---------------------------        BENEFITS
                                 ESTIMATED                        ACCRUED AS           ESTIMATED ANNUAL
                                  CREDITED                                                 BENEFITS
                                   YEARS        ESTIMATED          EXPENSES           UPON RETIREMENT(2)
                                 OF SERVICE     PERCENTAGE    ------------------      ------------------
                                     AT             OF                  BY ALL         FROM    FROM ALL
                                 RETIREMENT      ELIGIBLE     BY THE   ADOPTING        THE     ADOPTING
NAME OF INDEPENDENT TRUSTEE     (MAXIMUM 10)   COMPENSATION    FUND      FUNDS         FUND     FUNDS
- ------------------------------  ------------   ------------   ------   ---------      ------  ----------
<S>                             <C>            <C>            <C>      <C>            <C>     <C>
Michael Bozic.................       10           50.0%        $370    $  20,499      $  925  $   47,025
Edwin J. Garn.................       10           50.0          530       30,878         925      47,025
John R. Haire.................       10           50.0         (901)     (19,823)(3)   2,246     127,897
Wayne E. Hedien...............        9           42.5            0            0         794      39,971
Dr. Manuel H. Johnson.........       10           50.0          224       12,832         925      47,025
Michael E. Nugent.............       10           50.0          380       22,546         925      47,025
John L. Schroeder.............        8           41.7          709       39,350         771      39,504
</TABLE>
    
 
- ------------
   
(2) Based on  current levels  of compensation.  Amount of  annual benefits  also
    varies depending on the Trustee's elections described in Footnote (1) above.
    
 
   
(3) This  number reflects  the effect  of the extension  of Mr.  Haire's term as
    Director or Trustee until June 1, 1998.
    
 
   
    As of the date  of this Statement of  Additional Information, the  aggregate
number of shares of beneficial interest of the Fund owned by the Fund's officers
and  Trustees  as a  group  was less  than  1 percent  of  the Fund's  shares of
beneficial interest outstanding.
    
 
INVESTMENT PRACTICES AND POLICIES
- --------------------------------------------------------------------------------
 
    As discussed in  the Prospectus,  the Fund  may only  invest in  obligations
issued  or guaranteed  by the  U.S. Government  or its  instrumentalities ("U.S.
Government Securities"). All such obligations are backed by the "full faith  and
credit"  of  the  United  States.  Investments may  be  made  in  obligations of
instrumentalities of  the  U.S.  Government  only  where  such  obligations  are
guaranteed by the U.S. Government.
 
    ZERO  COUPON  SECURITIES.    A portion  of  the  U.S.  Government securities
purchased by the  Fund may be  "zero coupon" Treasury  securities with  maturity
dates  in each  case no later  than ten years  from the settlement  date for the
purchase of such security. These are U.S. Treasury bills, notes and bonds  which
have been stripped of their unmatured interest coupons and receipts or which are
certificates  representing  interests  in  such  stripped  debt  obligations and
coupons. "Zero coupon" securities  are purchased at a  discount from their  face
amount,  giving the purchaser the right to receive their full value at maturity.
A zero coupon security pays no interest to its holder during its life. Its value
to an investor consists of the difference between its face value at the time  of
maturity  and the price for which it  was acquired, which is generally an amount
significantly less  than  its face  value  (sometimes  referred to  as  a  "deep
discount" price).
 
    The  interest  earned  on  such  securities  is,  implicitly,  automatically
compounded and paid out at maturity.  While such compounding at a constant  rate
eliminates  the risk of receiving lower  yields upon reinvestment of interest if
prevailing interest rates decline, the owner  of a zero coupon security will  be
unable to participate in higher yields upon reinvestment of interest received if
prevailing  interest rates  rise. For  this reason,  zero coupon  securities are
subject to substantially  greater market  price fluctuations  during periods  of
changing  prevailing interest  rates than  are comparable  debt securities which
make current distributions of interest. Current federal tax law requires that  a
holder  (such as  the Fund) of  a zero coupon  security accrue a  portion of the
discount at which the security was purchased as income each year even though the
Fund receives no interest payments in cash on the security during the year.
 
                                       13
<PAGE>
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
    The investment restrictions listed  below have been adopted  by the Fund  as
fundamental policies, which may not be changed without the vote of a majority of
the  outstanding voting securities  of the Fund,  as defined in  the Act. Such a
majority is defined as the lesser of (a) 67% of the shares present at a  meeting
of  shareholders, if the holders  of more than 50%  of the outstanding shares of
the Fund  are present  or represented  by proxy,  or (b)  more than  50% of  the
outstanding  shares of the Fund. For  purposes of the following restrictions (a)
an "issuer" of a security is the entity whose assets and revenues are  committed
to  the payment of interest and  principal on that particular security, provided
that the guarantee of a security will be considered a separate security; and (b)
all percentage  limitations  apply  immediately  after  a  purchase  or  initial
investment,  and any  subsequent change  in any  applicable percentage resulting
from market  fluctuations or  other changes  in  total or  net assets  does  not
require elimination of any security from the portfolio.
 
    The Fund may not:
 
         1.  Purchase any securities other than obligations issued or guaranteed
    by the United  States Government. Such  obligations are backed  by the  full
    faith  and credit of the  United States. There is no  limit on the amount of
    its assets which may be invested in the securities of any one issuer of such
    obligations.
 
         2. Borrow money except from banks for temporary or emergency  purposes,
    including  the meeting of redemption  requests which might otherwise require
    the untimely disposition of securities.  Borrowing in the aggregate may  not
    exceed  20%, and borrowing  for purposes other  than meeting redemptions may
    not exceed 5%, of the value of the Fund's total assets (including the amount
    borrowed) at  the time  the borrowing  is  made. It  is the  Fund's  current
    intention  not  to  borrow  for  other  than  meeting  redemptions requests.
    Borrowings in excess of 5% will be repaid before additional investments  are
    made. Interest on borrowings will reduce net investment income.
 
         3.  Pledge,  hypothecate, mortgage  or  otherwise encumber  its assets,
    except in an amount  not exceeding 10%  of the value of  its net assets  but
    only to secure borrowings for temporary or emergency purposes.
 
         4. Sell securities short or purchase securities on margin.
 
         5. Make loans to others except through the purchase of debt obligations
    in accordance with the Fund's investment objective and policies.
 
         6.  Issue senior securities as defined in the Act except insofar as the
    Fund may be  deemed to have  a senior  security by reason  of (a)  borrowing
    money  in  accordance  with  restriction  (2)  described  above,  or  (b) by
    purchasing  securities  on  a  when-issued  or  delayed  delivery  basis  or
    purchasing or selling securities on a forward commitment basis.
 
         7.  Underwrite the securities  of other issuers  or purchase restricted
    securities.
 
         8. Purchase or sell real estate or interests therein, although the Fund
    may purchase securities of  issuers which engage  in real estate  operations
    and securities which are secured by real estate or interests therein.
 
    Notwithstanding  any other  investment policy  or restriction,  the Fund may
seek to achieve its investment objective  by investing all or substantially  all
of  its  assets  in another  investment  company having  substantially  the same
investment objective and policies as the Fund.
 
PORTFOLIO TRANSACTIONS AND BROKERAGE
- --------------------------------------------------------------------------------
 
    Subject to the general supervision of the Board of Trustees of the Fund, the
Investment Manager is responsible for  the investment decisions and the  placing
of  the orders  for portfolio  transactions for  the Fund.  The Fund's portfolio
transactions will occur primarily with issuers, underwriters or major dealers in
 
                                       14
<PAGE>
   
U.S. Government Securities acting as principals. Such transactions are  normally
on  a net basis which do not  involve payment of brokerage commissions. The cost
of securities purchased from an  underwriter usually includes a commission  paid
by  the issuer to  the underwriters; transactions  with dealers normally reflect
the spread between bid and asked prices. During the fiscal years ended  December
31, 1995, 1996 and 1997, the Fund did not pay any brokerage commissions.
    
 
    The Investment Manager currently serves as investment manager to a number of
clients,  including other  investment companies,  and may  in the  future act as
investment manager or adviser  to others. It is  the practice of the  Investment
Manager  to cause purchase and sale transactions  to be allocated among the Fund
and others whose  assets it manages  in such  manner as it  deems equitable.  In
making  such  allocations  among the  Fund  and other  client  accounts, various
factors may be considered, including  the respective investment objectives,  the
relative  size of portfolio  holdings of the same  or comparable securities, the
availability  of  cash  for  investment,  the  size  of  investment  commitments
generally  held and  the opinions  of the  persons responsible  for managing the
portfolios of the Fund and other client accounts. In the case of certain initial
and secondary public offerings,  the Investment Manager may  utilize a pro  rata
allocation  process based on the size of  the Dean Witter Funds involved and the
number of shares available from the public offering.
 
    The policy of the Fund, regarding purchases and sales of securities for  its
portfolio,  is  that  primary  consideration  be  given  to  obtaining  the most
favorable  prices  and  efficient  execution  of  transactions.  In  seeking  to
implement  the Fund's policies, the Investment Manager effects transactions with
those brokers and dealers who the  Investment Manager believes provide the  most
favorable  prices  and are  capable of  providing  efficient executions.  If the
Investment Manager believes such prices and executions are obtainable from  more
than  one  broker or  dealer,  it may  give  consideration to  placing portfolio
transactions with those brokers and dealers who also furnish research and  other
services  to the Fund or the Investment  Manager. Such services may include, but
are not limited  to, any one  or more of  the following: information  as to  the
availability  of  securities  for  purchase  or  sale;  statistical  or  factual
information or opinions pertaining to investment; wire services; and  appraisals
or evaluations of portfolio securities.
 
    The information and services received by the Investment Manager from brokers
and  dealers may be  of benefit to  the Investment Manager  in the management of
accounts of some of its  other clients and may not,  in every case, benefit  the
Fund  directly. While the receipt of such  information and services is useful in
varying degrees and would  generally reduce the amount  of research or  services
otherwise  performed by the Investment Manager  and thereby reduce its expenses,
it is of indeterminable value and the Fund does not reduce the management fee it
pays to the Investment  Manager by any  amount that may  be attributable to  the
value of such services.
 
   
    Pursuant to an order of the Securities and Exchange Commission, the Fund may
effect  principal transactions in certain money market instruments with DWR. The
Fund will limit its  transactions with DWR to  U.S. Government Securities.  Such
transactions will be effected with DWR only when the price available from DWR is
better  than that  available from other  dealers. During the  fiscal years ended
December 31,  1995,  1996  and 1997,  the  Fund  did not  effect  any  principal
transactions with DWR.
    
 
   
    Consistent  with  the  policy  described  above,  brokerage  transactions in
securities listed on exchanges or admitted to unlisted trading privileges may be
effected through DWR, Morgan  Stanley & Co. Incorporated  and other brokers  and
dealers  that  are  affiliates  of  the  Investment  Manager.  In  order  for an
affiliated broker or dealer to effect  portfolio transactions for the Fund,  the
commissions,  fees or  other remuneration received  by the  affiliated broker or
dealer must be reasonable  and fair compared to  the commissions, fees or  other
remuneration  paid to other  brokers in connection  with comparable transactions
involving similar securities  being purchased or  sold on an  exchange during  a
comparable  period of time.  This standard would allow  the affiliated broker or
dealer to receive no more  than the remuneration which  would be expected to  be
received  by an unaffiliated broker  in a commensurate arm's-length transaction.
Furthermore, the Trustees of the Fund, including a majority of the Trustees  who
are  not  "interested" Trustees,  have adopted  procedures which  are reasonably
designed to provide that any
    
 
                                       15
<PAGE>
   
commissions, fees or other remuneration paid  to an affiliated broker or  dealer
are  consistent with the foregoing standard. For the fiscal years ended December
31, 1995, 1996  and 1997, the  Fund did not  effect any securities  transactions
through an affiliated broker or dealer.
    
 
THE DISTRIBUTOR
- --------------------------------------------------------------------------------
 
   
    As  discussed in the Prospectus, shares of  the Fund are distributed by Dean
Witter Distributors Inc. (the "Distributor"). The Distributor has entered into a
selected dealer agreement  with DWR,  which through its  own sales  organization
sells  shares of the Fund. In addition,  the Distributor may enter into selected
dealer  agreements  with  other  selected  broker-dealers.  The  Distributor,  a
Delaware corporation, is a wholly-owned subsidiary of MSDW. The Trustees who are
not,  and were not  at the time they  voted, interested persons  of the Fund, as
defined in the Act (the "Independent Trustees"), approved, at their meeting held
on June 30, 1997, the current Distribution Agreement appointing the  Distributor
as  exclusive distributor of the Fund's shares and providing for the Distributor
to bear  distribution  expenses  not  borne  by the  Fund.  By  its  terms,  the
Distribution Agreement has an initial term ending April 30, 1998 and will remain
in effect from year to year thereafter if approved by the Board.
    
 
    The  Distributor bears all expenses incurred in providing services under the
Distribution Agreement. Such  expenses include  the payment  of commissions  for
sales of the Fund's shares and incentive compensation to account executives. The
Distributor  also pays certain  expenses in connection  with the distribution of
the Fund's shares, including the  costs of preparing, printing and  distributing
advertising or promotional materials, and the costs of printing and distributing
prospectuses  and supplements thereto  used in connection  with the offering and
sale of the Fund's shares to other than current shareholders. The Fund bears the
costs of  initial typesetting,  printing and  distribution of  prospectuses  and
supplements   thereto  to  shareholders.  The  Fund  also  bears  the  costs  of
registering the  Fund and  its shares  under federal  securities laws  and  pays
filing  fees  in  accordance  with  state  securities  laws.  The  Fund  and the
Distributor have agreed  to indemnify  each other  against certain  liabilities,
including  liabilities under the  Securities Act of 1933,  as amended. Under the
Distribution Agreement,  the  Distributor uses  its  best efforts  in  rendering
services  to the  Fund, but  in the absence  of willful  misfeasance, bad faith,
gross negligence or reckless  disregard of its  obligations, the Distributor  is
not  liable to the Fund or any of  its shareholders for any error of judgment or
mistake of law or  for any act or  omission or for any  losses sustained by  the
Fund or its shareholders.
 
PLAN OF DISTRIBUTION
 
   
    The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Act  (the "Plan")  pursuant to which  each Class,  other than Class  D, pays the
Distributor compensation  accrued daily  and payable  monthly at  the  following
annual  rates: 0.25% and  0.75% of the average  daily net assets  of Class A and
Class C, respectively,  and, with respect  to Class B,  0.75% (0.65% of  amounts
over  $10 billion) of the lesser of: (a) the average daily aggregate gross sales
of the Fund's  Class B shares  since the  inception of the  Fund (not  including
reinvestments  of dividends  or capital  gains distributions),  less the average
daily aggregate net asset value of the Fund's Class B shares redeemed since  the
Fund's  inception upon which a contingent deferred sales charge has been imposed
or upon which such charge has been  waived, or (b) the average daily net  assets
of  the  Fund. The  Distributor also  receives the  proceeds of  front-end sales
charges and of contingent deferred sales charges imposed on certain  redemptions
of  shares, which are separate and apart from payments made pursuant to the Plan
(see "Purchase of Fund Shares" in the Prospectus). The Distributor has  informed
the  Fund that it and/or DWR  received (a) approximately $10,629,000, $8,964,262
and $5,836,190 in contingent deferred sales charges from Class B for the  fiscal
years  ended December 31,  1995, 1996 and  1997, respectively, (b) approximately
$25 and $7040 in  contingent deferred sales  charges from Class  A and Class  C,
respectively, for the fiscal year ended December 31, 1997, and (c) approximately
$159,161  in front-end  sales charges  from Class  A for  the fiscal  year ended
December 31, 1997, none of which was retained by the Distributor.
    
 
                                       16
<PAGE>
    The Distributor has informed the Fund that the entire fee payable by Class A
and  a portion  of the fees  payable by each  of Class  B and Class  C each year
pursuant to the Plan equal to 0.20% of  the average daily net assets of Class  B
and  0.25%  of  the average  daily  net assets  of  Class C  are  currently each
characterized as  a "service  fee" under  the Rules  of the  Association of  the
National  Association of Securities Dealers, Inc. (of which the Distributor is a
member). The "service  fee" is a  payment made for  personal service and/or  the
maintenance  of shareholder  accounts. The  remaining portion  of the  Plan fees
payable by a Class, if any, is characterized as an "asset-based sales charge" as
such is defined by the aforementioned Rules of the Association.
 
    The Plan was adopted by a majority vote of the Board of Trustees,  including
all of the Trustees of the Fund who are not "interested persons" of the Fund (as
defined in the Act) and who have no direct or indirect financial interest in the
operation  of the Plan (the  "Independent 12b-1 Trustees"), cast  in person at a
meeting called for the purpose of voting on the Plan, on April 16, 1984, by  DWR
as the then sole shareholder of the Fund on May 1, 1984, and by the shareholders
holding  a majority, as defined in the Act, of the outstanding voting securities
of the Fund at a Meeting of Shareholders of the Fund held on April 22, 1985.
 
    At their  meeting  held on  October  30, 1992,  the  Trustees of  the  Fund,
including  all of the Independent 12b-1 Trustees, approved certain amendments to
the Plan which took  effect in January,  1993 and were  designed to reflect  the
fact  that  upon  the  reorganization  described  above  the  share distribution
activities theretofore  performed  for the  Fund  by  DWR were  assumed  by  the
Distributor  and DWR's sales activities are  now being performed pursuant to the
terms of  a selected  dealer  agreement between  the  Distributor and  DWR.  The
amendments  provide that payments under the Plan will be made to the Distributor
rather than to DWR as before the amendment, and that the Distributor in turn  is
authorized   to  make  payments  to  DWR,   its  affiliates  or  other  selected
broker-dealers (or  direct  that  the  Fund pay  such  entities  directly).  The
Distributor  is also authorized to  retain part of such  fee as compensation for
its own distribution-related expenses. At their meeting held on April 28,  1993,
the  Trustees, including a majority of  the Independent 12b-1 Trustees, approved
certain technical amendments to the  Plan in connection with amendments  adopted
by  the National  Association of  Securities Dealers, Inc.  to its  Rules of the
Association. At their  meeting held  on October 26,  1995, the  Trustees of  the
Fund,  including all of the Independent 12b-1 Trustees, approved an amendment to
the Plan to permit payments  to be made under the  Plan with respect to  certain
distribution  expenses incurred in  connection with the  distribution of shares,
including personal services  to shareholders  with respect to  holdings of  such
shares,  of an  investment company whose  assets are  acquired by the  Fund in a
tax-free reorganization. At their meeting held  on June 30, 1997, the  Trustees,
including  a majority of the Independent  12b-1 Trustees, approved amendments to
the Plan to reflect the multiple-class structure for the Fund, which took effect
on July 28, 1997.
 
   
    Under the  Plan and  as required  by Rule  12b-1, the  Trustees receive  and
review promptly after the end of each calendar quarter a written report provided
by the Distributor of the amounts expended by the Distributor under the Plan and
the  purpose for which such  expenditures were made. Class  B shares of the Fund
accrued amounts payable  to the Distributor  under the Plan,  during the  fiscal
year  ended December 31, 1997, of $43,758,596.  This amount is equal to 0.75% of
the average daily net assets of Class  B for the fiscal year and was  calculated
pursuant  to clause  (b) under  the Plan.  For the  fiscal period  July 28, 1997
through December  31, 1997,  Class A  and Class  C shares  of the  Fund  accrued
payments  under the  Plan amounting to  $13,027 and  $7,914, respectively, which
amounts are equal to 0.25% and 0.75% of the average daily net assets of Class  A
and Class C, respectively, for such period.
    
 
    The  Plan was adopted  in order to  permit the implementation  of the Fund's
method of  distribution. Under  this distribution  method the  Fund offers  four
Classes  of shares, each with a  different distribution arrangement as set forth
in the Prospectus.
 
    With respect to Class  A shares, DWR compensates  its account executives  by
paying  them, from proceeds  of the front-end sales  charge, commissions for the
sale of Class  A shares, currently  a gross sales  credit of up  to 4.0% of  the
amount  sold  (except  as provided  in  the  following sentence)  and  an annual
residual commission, currently a residual of up to 0.20% of the current value of
the respective
 
                                       17
<PAGE>
   
accounts for which they are the account  executives or dealers of record in  all
cases.  On orders of $1 million or more  (for which no sales charge was paid) or
net asset value purchases by employer-sponsored 401(k) and other plans qualified
under Section 401(a) of the Internal Revenue Code ("Qualified Retirement Plans")
for which MSDW Trust serves as Trustee or DWR's Retirement Plan Services  serves
as  recordkeeper  pursuant to  a written  Recordkeeping Services  Agreement, the
Investment Manager compensates DWR's account executives by paying them, from its
own funds, a gross sales credit of 1.0% of the amount sold.
    
 
   
    With respect to Class  B shares, DWR compensates  its account executives  by
paying  them, from its  own funds, commissions  for the sale  of Class B shares,
currently a gross  sales credit  of up  to 4.0% of  the amount  sold (except  as
provided in the following sentence) and an annual residual commission, currently
a  residual  of up  to  0.20% of  the  current value  (not  including reinvested
dividends or distributions)  of the amount  sold in  all cases. In  the case  of
Class B shares purchased on or after July 28, 1997 by Qualified Retirement Plans
for  which MSDW Trust serves as Trustee or DWR's Retirement Plan Services serves
as recordkeeper  pursuant to  a written  Recordkeeping Services  Agreement,  DWR
compensates  its account executives by paying them,  from its own funds, a gross
sales credit of 3.0% of the amount sold.
    
 
    With respect to Class  C shares, DWR compensates  its account executives  by
paying  them, from its  own funds, commissions  for the sale  of Class C shares,
currently a gross sales credit  of up to 1.0% of  the amount sold and an  annual
residual commission, currently a residual of up to 0.75% of the current value of
the respective accounts for which they are the account executives of record.
 
    With respect to Class D shares other than shares held by participants in the
InterCapital  mutual  fund  asset  allocation  program,  the  Investment Manager
compensates DWR's  account  executives  by  paying them,  from  its  own  funds,
commissions for the sale of Class D shares, currently a gross sales credit of up
to  1.0% of the amount sold. There is a chargeback of 100% of the amount paid if
the Class D shares are redeemed in the first year and a chargeback of 50% of the
amount paid  if  the Class  D  shares are  redeemed  in the  second  year  after
purchase.  The Investment Manager  also compensates DWR's  account executives by
paying them, from  its own  funds, an  annual residual  commission, currently  a
residual  of up  to 0.10% of  the current  value of the  respective accounts for
which they  are the  account executives  of record  (not including  accounts  of
participants in the InterCapital mutual fund asset allocation program).
 
   
    The gross sales credit is a charge which reflects commissions paid by DWR to
its  account executives and DWR's Fund associated distribution-related expenses,
including  sales   compensation   and   overhead   and   other   branch   office
distribution-related  expenses including:  (a) the  expenses of  operating DWR's
branch offices  in connection  with the  sale of  Fund shares,  including  lease
costs,  the  salaries  and employee  benefits  of operations  and  sales support
personnel, utility costs, communications costs  and the costs of stationery  and
supplies,  (b) the costs of client sales seminars, (c) travel expenses of mutual
fund sales  coordinators  to promote  the  sale of  Fund  shares and  (d)  other
expenses  relating to branch promotion of Fund share sales. The distribution fee
that the Distributor receives from the  Fund under the Plan, in effect,  offsets
distribution  expenses incurred under the Plan on behalf of the Fund and, in the
case of Class B shares, opportunity costs, such as the gross sales credit and an
assumed interest  charge  thereon  ("carrying  charge").  In  the  Distributor's
reporting  of the  distribution expenses  to the  Fund, in  the case  of Class B
shares, such assumed interest  (computed at the "broker's  call rate") has  been
calculated on the gross sales credit as it is reduced by amounts received by the
Distributor under the Plan and any contingent deferred sales charges received by
the  Distributor upon redemption of shares of the Fund. No other interest charge
is included as a  distribution expense in the  Distributor's calculation of  its
distribution costs for this purpose. The broker's call rate is the interest rate
charged to securities brokers on loans secured by exchange-listed securities.
    
 
    The  Fund is authorized to reimburse expenses  incurred or to be incurred in
promoting the distribution  of the  Fund's Class  A and  Class C  shares and  in
servicing  shareholder accounts. Reimbursement will  be made through payments at
the  end  of   each  month.  The   amount  of  each   monthly  payment  may   in
 
                                       18
<PAGE>
no event exceed an amount equal to a payment at the annual rate of 0.25%, in the
case of Class A, and 0.75%, in the case of Class C, of the average net assets of
the  respective Class during the month.  No interest or other financing charges,
if any, incurred on any distribution expenses  on behalf of Class A and Class  C
will be reimbursable under the Plan. With respect to Class A, in the case of all
expenses  other than expenses representing the service fee, and, with respect to
Class C, in the case  of all expenses other  than expenses representing a  gross
sales  credit  or  a  residual  to account  executives,  such  amounts  shall be
determined at the beginning of each calendar quarter by the Trustees,  including
a  majority of the Independent 12b-1 Trustees. Expenses representing the service
fee (for Class A) or  a gross sales credit or  a residual to account  executives
(for  Class C) may be reimbursed without  prior determination. In the event that
the Distributor proposes  that monies shall  be reimbursed for  other than  such
expenses,  then in  making quarterly determinations  of the amounts  that may be
reimbursed by  the Fund,  the Distributor  will provide  and the  Trustees  will
review  a quarterly budget of projected  distribution expenses to be incurred on
behalf of  the  Fund,  together  with  a  report  explaining  the  purposes  and
anticipated  benefits of  incurring such  expenses. The  Trustees will determine
which particular expenses, and  the portions thereof, that  may be borne by  the
Fund,  and  in making  such  a determination  shall  consider the  scope  of the
Distributor's commitment to promoting the distribution of the Fund's Class A and
Class C shares.
 
   
    Each Class paid 100% of the amounts  accrued under the Plan with respect  to
that  Class for the fiscal year ended  December 31, 1997 to the Distributor. The
Distributor and  DWR  estimate that  they  have  spent, pursuant  to  the  Plan,
$1,167,710,938  on behalf  of Class  B since  the inception  of the  Plan. It is
estimated that this amount  was spent in approximately  the following ways:  (i)
0.63%   ($7,300,345)--   advertising  and   promotional  expenses;   (ii)  0.12%
($1,396,881)--printing of prospectuses  for distribution to  other than  current
shareholders;  and (iii) 99.25%  ($1,159,013,712)--other expenses, including the
gross sales  credit and  the  carrying charge,  of which  14.96%  ($173,403,612)
represents carrying charges, 34.94% ($404,987,190) represents commission credits
to  DWR branch  offices for  payments of  commissions to  account executives and
50.10%   ($580,622,910)   represents   overhead   and   other   branch    office
distribution-related  expenses. The amounts  accrued by Class A  and Class C for
distribution during the fiscal  period July 28, 1997  through December 31,  1997
were for expenses which relate to compensation of sales personnel and associated
overhead expenses.
    
 
   
    In  the  case  of  Class  B  Shares, at  any  given  time,  the  expenses of
distributing shares of the Fund  may be more or less  than the total of (i)  the
payments  made  by  the Fund  pursuant  to the  Plan  and (ii)  the  proceeds of
contingent deferred sales charges paid  by investors upon redemption of  shares.
The  Distributor has  advised the Fund  that in the  case of Class  B shares the
excess expenses,  including  the carrying  charge  designed to  approximate  the
opportunity  costs incurred  by DWR which  arise from it  having advanced monies
without having received the amount of any  sales charges imposed at the time  of
sale of the Fund's Class B shares, totalled $34,202,402 as of December 31, 1997.
Because  there  is  no  requirement  under  the  Plan  that  the  Distributor be
reimbursed for all distribution expenses with  respect to Class B shares or  any
requirement  that the Plan  be continued from  year to year,  this excess amount
does not  constitute  a  liability of  the  Fund.  Although there  is  no  legal
obligation  for the Fund to pay expenses  incurred in excess of payments made to
the Distributor under  the Plan and  the proceeds of  contingent deferred  sales
charges  paid by investors upon redemption of shares, if for any reason the Plan
is terminated, the Trustees will  consider at that time  the manner in which  to
treat  such expenses.  Any cumulative expenses  incurred, but  not yet recovered
through distribution fees or contingent deferred  sales charges, may or may  not
be  recovered  through future  distribution  fees or  contingent  deferred sales
charges.
    
 
    No interested person of the Fund nor any  Trustee of the Fund who is not  an
interested  person of the Fund, as defined  in the Act, has any direct financial
interest in the operation of the Plan except to the extent that the Distributor,
InterCapital, DWSC, DWR, or  certain of their employees,  may be deemed to  have
such  an interest as a result of  benefits derived from the successful operation
of the  Plan or  as a  result of  receiving a  portion of  the amounts  expended
thereunder by the Fund.
 
    Under  its terms, the Plan had an  initial term ending December 31, 1984 and
will continue  from  year  to  year thereafter,  provided  such  continuance  is
approved annually by a vote of the Trustees in the
 
                                       19
<PAGE>
manner  described above. Prior to the Board's approval of amendments to the Plan
to  reflect  the  multiple-class  structure  for  the  Fund,  the  most   recent
continuance  of the Plan for one year, until April 30, 1998, was approved by the
Board of Trustees  of the Fund,  including a majority  of the Independent  12b-1
Trustees,  at a  Board meeting held  on April  24, 1997. Prior  to approving the
continuation  of  the  Plan,  the  Trustees  requested  and  received  from  the
Distributor  and reviewed  all the  information which  they deemed  necessary to
arrive at an informed determination.  In making their determination to  continue
the  Plan, the Trustees considered: (1) the Fund's experience under the Plan and
whether such experience indicates that the Plan is operating as anticipated; (2)
the benefits the Fund had obtained, was obtaining and would be likely to  obtain
under  the Plan; and (3) what services  had been provided and were continuing to
be provided under the Plan  to the Fund and  its shareholders. Based upon  their
review,  the  Trustees of  the  Fund, including  each  of the  Independent 12b-1
Trustees, determined that continuation of the Plan would be in the best interest
of the Fund and would have a reasonable likelihood of continuing to benefit  the
Fund  and its shareholders. In the Trustees'  quarterly review of the Plan, they
will consider  its  continued  appropriateness and  the  level  of  compensation
provided herein.
 
    The  Plan may not be  amended to increase materially  the amount to be spent
for the services described therein without  approval by the shareholders of  the
affected  Class or Classes of the Fund,  and all material amendments to the Plan
must also be approved by  the Trustees in the  manner described above. The  Plan
may  be terminated  at any time,  without payment of  any penalty, by  vote of a
majority of the Independent  12b-1 Trustees or  by a vote of  a majority of  the
outstanding  voting securities of the  Fund (as defined in  the Act) on not more
than thirty days' written notice to any other party to the Plan. So long as  the
Plan  is in  effect, the election  and nomination of  Independent 12b-1 Trustees
shall be committed to the discretion of the Independent 12b-1 Trustees.
 
DETERMINATION OF NET ASSET VALUE
- --------------------------------------------------------------------------------
 
    As stated in the Prospectus, short-term securities with remaining maturities
of sixty days  or less at  the time of  purchase are valued  at amortized  cost,
unless  the  Trustees determine  such does  not  reflect the  securities' market
value, in which  case these securities  will be  valued at their  fair value  as
determined by the Trustees. Other short-term debt securities will be valued on a
mark-to-market basis until such time as they reach a remaining maturity of sixty
days,  whereupon they will be valued at  amortized cost using their value on the
61st day unless  the Trustees determine  such does not  reflect the  securities'
market  value, in which case these securities will be valued at their fair value
as determined by the Trustees. All other securities and other assets are  valued
at  their fair value as determined in good faith under procedures established by
and under the supervision of the Trustees.
 
   
    The net  asset value  per share  for each  Class of  shares of  the Fund  is
determined once daily at 4:00 p.m., New York time (or, on days when the New York
Stock  Exchange closes prior  to 4:00 p.m.,  at such earlier  time), on each day
that the New York Stock Exchange is open. The New York Stock Exchange  currently
observes the following holidays: New Year's Day, Reverend Dr. Martin Luther King
Jr.  Day, Presidents'  Day, Good Friday,  Memorial Day,  Independence Day, Labor
Day, Thanksgiving Day, and Christmas Day.
    
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
    As discussed in the  Prospectus, the Fund offers  four Classes of shares  as
follows:
 
INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES
 
    Class  A shares  are sold  to investors  with an  initial sales  charge that
declines to zero for larger purchases;  however, Class A shares sold without  an
initial  sales charge are subject to a contingent deferred sales charge ("CDSC")
of 1.0% if  redeemed within one  year of purchase,  except in the  circumstances
discussed in the Prospectus.
 
    RIGHT  OF  ACCUMULATION.   As  discussed  in the  Prospectus,  investors may
combine the  current value  of  shares purchased  in separate  transactions  for
purposes of benefitting from the reduced sales charges
 
                                       20
<PAGE>
available  for purchases of shares of the Fund totalling at least $25,000 in net
asset value.  For  example, if  any  person or  entity  who qualifies  for  this
privilege  holds Class A shares of the  Fund and/or other Dean Witter Funds that
are multiple class funds  ("Dean Witter Multi-Class Funds")  or shares of  other
Dean  Witter  Funds sold  with a  front-end  sales charge  purchased at  a price
including a  front-end  sales charge  having  a  current value  of  $5,000,  and
purchases  $20,000 of additional shares of the Fund, the sales charge applicable
to the $20,000 purchase would be 4.0% of the offering price.
 
   
    The Distributor  must  be notified  by  the selected  broker-dealer  or  the
shareholder  at the time a purchase order  is placed that the purchase qualifies
for the reduced  charge under  the Right of  Accumulation. Similar  notification
must  be made in writing by the  selected broker-dealer or shareholder when such
an order is placed by mail. The reduced sales charge will not be granted if: (a)
such notification is not furnished at the time of the order; or (b) a review  of
the  records of  the Distributor  or Morgan Stanley  Dean Witter  Trust FSB (the
"Transfer Agent") fails to confirm the investor's represented holdings.
    
 
    LETTER OF INTENT.  As discussed in the Prospectus, reduced sales charges are
available to investors who enter into  a written Letter of Intent providing  for
the purchase, within a thirteen-month period, of Class A shares of the Fund from
the Distributor or from a single Selected Broker-Dealer.
 
    A  Letter of Intent permits an investor to establish a total investment goal
to be achieved  by any number  of purchases over  a thirteen-month period.  Each
purchase of Class A shares made during the period will receive the reduced sales
commission  applicable to the  amount represented by  the goal, as  if it were a
single purchase. A number of shares equal in value to 5% of the dollar amount of
the Letter of Intent will be held in  escrow by the Transfer Agent, in the  name
of  the shareholder. The initial purchase under a Letter of Intent must be equal
to at least 5% of the stated investment goal.
 
    The Letter of  Intent does not  obligate the investor  to purchase, nor  the
Fund  to sell, the indicated  amount. In the event the  Letter of Intent goal is
not achieved within the thirteen-month period,  the investor is required to  pay
the  difference between the  sales charge otherwise  applicable to the purchases
made during this  period and sales  charges actually paid.  Such payment may  be
made  directly to the Distributor or, if not paid, the Distributor is authorized
by the  shareholder to  liquidate a  sufficient number  of his  or her  escrowed
shares to obtain such difference.
 
    If  the goal is exceeded and purchases pass the next sales charge level, the
sales charge on the entire amount of  the purchase that results in passing  that
level  and  on subsequent  purchases will  be subject  to further  reduced sales
charges in the same manner as set forth above under "Right of Accumulation," but
there will be no retroactive reduction  of sales charges on previous  purchases.
For  the purpose of  determining whether the  investor is entitled  to a further
reduced sales charge applicable  to purchases at or  above a sales charge  level
which  exceeds the stated goal of a Letter of Intent, the cumulative current net
asset value of any shares owned by  the investor in any other Dean Witter  Funds
held  by the shareholder which were previously  purchased at a price including a
front-end sales charge (including shares of the Fund and other Dean Witter Funds
acquired in  exchange  for those  shares,  and  including in  each  case  shares
acquired  through reinvestment of dividends and  distributions) will be added to
the cost  or net  asset value  of  shares of  the Fund  owned by  the  investor.
However,   shares  of  "Exchange  Funds"  (see  "Shareholder  Services--Exchange
Privilege") and the purchase of  shares of other Dean  Witter Funds will not  be
included  in determining whether the stated goal  of a Letter of Intent has been
reached.
 
    At any time while  a Letter of  Intent is in effect,  a shareholder may,  by
written  notice to the Distributor,  increase the amount of  the stated goal. In
that event, only shares  purchased during the previous  90-day period and  still
owned by the shareholder will be included in the new sales charge reduction. The
5% escrow and minimum purchase requirements will be applicable to the new stated
goal.  Investors electing to purchase shares of the Fund pursuant to a Letter of
Intent should carefully read such Letter of Intent.
 
                                       21
<PAGE>
CONTINGENT DEFERRED SALES CHARGE ALTERNATIVE--CLASS B SHARES
 
   
    Class B shares are sold without an initial sales charge but are subject to a
CDSC payable upon most redemptions within six years after purchase. As stated in
the Prospectus, a CDSC will be imposed on any redemption by an investor if after
such redemption the current value of the  investor's Class B shares of the  Fund
is  less  than the  dollar amount  of all  payments by  the shareholder  for the
purchase of Class B shares  during the preceding six years  (or, in the case  of
shares  held by  certain Qualified Retirement  Plans, three  years). However, no
CDSC will  be imposed  to the  extent that  the net  asset value  of the  shares
redeemed  does not exceed: (a)  the current net asset  value of shares purchased
more than  six years  (or,  in the  case of  shares  held by  certain  Qualified
Retirement Plans, three years) prior to the redemption, plus (b) the current net
asset   value  of  shares   purchased  through  reinvestment   of  dividends  or
distributions of  the  Fund  or  another  Dean  Witter  Fund  (see  "Shareholder
Services--Targeted  Dividends"), plus (c) the current  net asset value of shares
acquired in exchange for (i) shares of Dean Witter front-end sales charge funds,
or (ii) shares of other  Dean Witter Funds for  which shares of front-end  sales
charge   funds   have  been   exchanged  (see   "Shareholder  Services--Exchange
Privilege"), plus (d) increases in the net asset value of the investor's  shares
above  the total amount of payments for  the purchase of Fund shares made during
the preceding six (three) years. The CDSC will be paid to the Distributor.
    
 
   
    In determining the applicability of the CDSC to each redemption, the  amount
which  represents an increase  in the net  asset value of  the investor's shares
above the amount of  the total payments  for the purchase  of shares within  the
last  six years (or, in the case  of shares held by certain Qualified Retirement
Plans, three years) will be redeemed  first. In the event the redemption  amount
exceeds  such increase in value, the next portion of the amount redeemed will be
the amount  which  represents the  net  asset  value of  the  investor's  shares
purchased  more than  six (three)  years prior  to the  redemption and/or shares
purchased through  reinvestment  of  dividends or  distributions  and/or  shares
acquired  in exchange for shares of Dean Witter front-end sales charge funds, or
for shares of other Dean Witter funds for which shares of front-end sales charge
funds have been  exchanged. A portion  of the amount  redeemed which exceeds  an
amount  which represents  both such  increase in value  and the  value of shares
purchased more  than six  years  (or, in  the case  of  shares held  by  certain
Qualified  Retirement Plans, three years) prior  to the redemption and/or shares
purchased through  reinvestment of  dividends or  distributions and/  or  shares
acquired in the above-described exchanges will be subject to a CDSC.
    
 
    The  amount of the CDSC, if any, will  vary depending on the number of years
from the time of payment  for the purchase of Class  B shares of the Fund  until
the time of redemption of such shares. For purposes of determining the number of
years from the time of any payment for the purchase of shares, all payments made
during  a month will be aggregated and deemed  to have been made on the last day
of the month. The following table sets forth the rates of the CDSC applicable to
most Class B shares of the Fund:
 
<TABLE>
<CAPTION>
                                                                                            CDSC AS A
                                        YEAR SINCE                                          PERCENTAGE
                                         PURCHASE                                           OF AMOUNT
                                       PAYMENT MADE                                         REDEEMED
- ------------------------------------------------------------------------------------------  ---------
<S>                                                                                         <C>
First.....................................................................................       5.0%
Second....................................................................................       4.0%
Third.....................................................................................       3.0%
Fourth....................................................................................       2.0%
Fifth.....................................................................................       2.0%
Sixth.....................................................................................       1.0%
Seventh and thereafter....................................................................    None
</TABLE>
 
                                       22
<PAGE>
   
    The following table sets forth the rates  of the CDSC applicable to Class  B
shares  of the Fund purchased on or  after July 28, 1997 by Qualified Retirement
Plans for which MSDW Trust serves  as Trustee or DWR's Retirement Plan  Services
serves as recordkeeper pursuant to a written Recordkeeping Services Agreement:
    
 
<TABLE>
<CAPTION>
                                                                                            CDSC AS A
                                        YEAR SINCE                                          PERCENTAGE
                                         PURCHASE                                           OF AMOUNT
                                       PAYMENT MADE                                         REDEEMED
- ------------------------------------------------------------------------------------------  ---------
<S>                                                                                         <C>
First.....................................................................................       2.0%
Second....................................................................................       2.0%
Third.....................................................................................       1.0%
Fourth and thereafter.....................................................................    None
</TABLE>
 
   
    In determining the rate of the CDSC, it will be assumed that a redemption is
made  of shares held by  the investor for the longest  period of time within the
applicable six-year or  three-year period.  This will  result in  any such  CDSC
being  imposed  at  the lowest  possible  rate.  The CDSC  will  be  imposed, in
accordance with the table shown above, on any redemptions within six years  (or,
in  the case of shares held by  certain Qualified Retirement Plans, three years)
of purchase which are in  excess of these amounts  and which redemptions do  not
qualify for waiver of the CDSC, as described in the Prospectus.
    
 
LEVEL LOAD ALTERNATIVE--CLASS C SHARES
 
    Class  C shares are sold without a sales charge but are subject to a CDSC of
1.0% on most  redemptions made  within one year  after purchase,  except in  the
circumstances discussed in the Prospectus.
 
NO LOAD ALTERNATIVE--CLASS D SHARES
 
    Class  D  shares  are  offered  without  any  sales  charge  on  purchase or
redemption. Class  D  shares are  offered  only  to those  persons  meeting  the
qualifications set forth in the Prospectus.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
    Upon the purchase of shares of the Fund, a Shareholder Investment Account is
opened  for the investor on the books of the Fund and maintained by the Transfer
Agent. This  is an  open  account in  which shares  owned  by the  investor  are
credited  by the Transfer Agent in lieu of issuance of a share certificate. If a
share certificate  is  desired,  it  must  be  requested  in  writing  for  each
transaction. Certificates are issued only for full shares and may be redeposited
in the account at any time. There is no charge to the investor for issuance of a
certificate.  Whenever a  shareholder-instituted transaction takes  place in the
Shareholder Investment Account, the shareholder will be mailed a confirmation of
the transaction from the Fund or from DWR or other selected broker-dealer.
 
    AUTOMATIC INVESTMENT  OF DIVIDENDS  AND  DISTRIBUTIONS.   As stated  in  the
Prospectus,   all  income   dividends  and   capital  gains   distributions  are
automatically paid in full and fractional shares of the applicable Class of  the
Fund,  unless the shareholder requests that they  be paid in cash. Each purchase
of shares of  the Fund is  made upon the  condition that the  Transfer Agent  is
thereby  automatically  appointed  as  agent  of  the  investor  to  receive all
dividends and capital gains distributions on shares owned by the investor.  Such
dividends  and distributions will be paid, at  the net asset value per share, in
shares of the Fund (or in cash if  the shareholder so requests) as of the  close
of  business on the  monthly payment date,  as stated in  the Prospectus. At any
time an investor may request the Transfer Agent, in writing, to have  subsequent
dividends  and/or capital gains distributions paid to  him or her in cash rather
than shares. To assure  sufficient time to process  the change, such request  be
received  by the Transfer Agent at least five business days prior to the payment
date of the  dividend or the  record date of  the distribution. In  the case  of
recently  purchased  shares for  which registration  instructions have  not been
received on the payment  or record date,  cash payments will be  made to DWR  or
other selected
 
                                       23
<PAGE>
   
broker-dealer,  and will  be forwarded to  the shareholder, upon  the receipt of
proper instructions. It  has been  and remains  the Fund's  policy and  practice
that,  if checks for dividends or distributions paid in cash remain uncashed, no
interest will accrue on amounts represented by such uncashed checks.
    
 
    TARGETED  DIVIDENDS.-SM-    In  states  where  it  is  legally  permissible,
shareholders  may also have all income dividends and capital gains distributions
automatically invested in shares  of any Class of  an open-end Dean Witter  Fund
other  than Dean Witter U.S. Government Securities  Trust or in another Class of
Dean Witter U.S. Government  Securities Trust. Such investment  will be made  as
described  above for automatic  investment in shares of  the applicable Class of
the Fund, at the net asset value per  share of the selected Dean Witter Fund  as
of the close of business on the payment date of the dividend or distribution and
will  begin to earn dividends, if any, in the selected Dean Witter Fund the next
business day. To  participate in  the Targeted  Dividends program,  shareholders
should  contact their DWR  or other selected  broker-dealer account executive or
the Transfer  Agent.  Shareholders of  the  Fund  must be  shareholders  of  the
selected  Class of  the Dean  Witter Fund  targeted to  receive investments from
dividends at  the time  they  enter the  Targeted Dividends  program.  Investors
should  review the prospectus  of the targeted Dean  Witter Fund before entering
the program.
 
   
    EASYINVEST.-SM-   Shareholders may  subscribe  to EasyInvest,  an  automatic
purchase  plan  which  provides  for  any  amount  from  $100  to  $5,000  to be
transferred automatically  from  a  checking or  savings  account  or  following
redemption  of shares  of a  Dean Witter money  market fund,  on a semi-monthly,
monthly or quarterly basis,  to the Transfer Agent  for investment in shares  of
the Fund. Shares purchased through EasyInvest will be added to the shareholder's
existing  account at the  net asset value  calculated the same  business day the
transfer of funds is effected (subject to any applicable sales charges).  Shares
of the Dean Witter money market funds redeemed in connection with EasyInvest are
redeemed  on  the business  day  preceding the  transfer  of funds.  For further
information or to subscribe to EasyInvest, shareholders should contact their DWR
or other selected broker-dealer account executive or the Transfer Agent.
    
 
    INVESTMENT OF DIVIDENDS OR DISTRIBUTIONS RECEIVED IN CASH.  As discussed  in
the  Prospectus,  any shareholder  who receives  a  cash payment  representing a
dividend or capital gains distribution may invest such dividend or  distribution
at  net  asset value,  without  the imposition  of  a CDSC  upon  redemption, by
returning the check  or the proceeds  to the Transfer  Agent within thirty  days
after the payment date. If the shareholder returns the proceeds of a dividend or
distribution,  such funds must  be accompanied by  a signed statement indicating
that the proceeds  constitute a dividend  or distribution to  be invested.  Such
investment  will be made at the net  asset value per share next determined after
receipt of the check or proceeds by the Transfer Agent.
 
    SYSTEMATIC WITHDRAWAL PLAN.   As discussed in  the Prospectus, a  systematic
withdrawal plan (the "Withdrawal Plan") is available for shareholders who own or
purchase  shares of the  Fund having a  minimum value of  $10,000 based upon the
then current  net asset  value.  The Withdrawal  Plan  provides for  monthly  or
quarterly (March, June, September and December) checks in any dollar amount, not
less  then  $25,  or in  any  whole percentage  of  the account  balance,  on an
annualized basis. Any applicable CDSC will  be imposed on shares redeemed  under
the  Withdrawal  Plan  (see  "Purchase  of  Fund  Shares"  in  the  Prospectus).
Therefore, any  shareholder  participating  in the  Withdrawal  Plan  will  have
sufficient  shares redeemed from his or her account so that the proceeds (net of
any applicable  CDSC) to  the  shareholder will  be  the designated  monthly  or
quarterly amount.
 
    The  Transfer Agent acts  as agent for  the shareholder in  tendering to the
Fund for redemption sufficient full and fractional shares to provide the  amount
of  the periodic  withdrawal payment designated  in the  application. The shares
will be  redeemed at  their net  asset value  determined, at  the  shareholder's
option, on the tenth or twenty-fifth day (or next following business day) of the
relevant  month or quarter and normally a  check for the proceeds will be mailed
by the  Transfer Agent,  or amounts  credited to  a shareholder's  DWR or  other
selected  broker-dealer brokerage account,  within five business  days after the
date of redemption. The  Withdrawal Plan may  be terminated at  any time by  the
Fund.
 
                                       24
<PAGE>
    Withdrawal  Plan payments should  not be considered  as dividends, yields or
income. If periodic withdrawal plan payments continuously exceed net  investment
income  and net  capital gains,  the shareholder's  original investment  will be
correspondingly reduced and ultimately exhausted.
 
    Each withdrawal constitutes  a redemption  of shares  and any  gain or  loss
realized  must  be  recognized for  federal  income tax  purposes.  Although the
shareholder may  make  additional  investments  of  $2,500  or  more  under  the
Withdrawal  Plan, withdrawals made currently with purchases of additional shares
may be inadvisable because of sales charges which may be applicable to purchases
or redemptions of shares (see "Purchase of Fund Shares").
 
    Any shareholder who wishes to have  payments under the Withdrawal Plan  made
to  a third party or sent to an address other than the one listed on the account
must send complete written instructions to  the Transfer Agent to enroll in  the
Withdrawal  Plan.  The  shareholder's  signature on  such  instructions  must be
guaranteed  by  an   eligible  guarantor  acceptable   to  the  Transfer   Agent
(shareholders  should  contact  the Transfer  Agent  for a  determination  as to
whether a particular institution is  such an eligible guarantor). A  shareholder
may,  at any time, change the amount and interval of withdrawal payments through
his or her Account Executive or  by written notification to the Transfer  Agent.
In  addition, the  party and/or the  address to  which checks are  mailed may be
changed by written notification to the Transfer Agent, with signature guarantees
required in the manner described above.  The shareholder may also terminate  the
Withdrawal  Plan at  any time by  written notice  to the Transfer  Agent. In the
event  of  such  termination,  the  account  will  be  continued  as  a  regular
shareholder  investment account. The shareholder may  also redeem all or part of
the  shares  held  in  the   Withdrawal  Plan  account  (see  "Redemptions   and
Repurchases" in the Prospectus) at any time.
 
    DIRECT  INVESTMENTS THROUGH TRANSFER AGENT.  As discussed in the Prospectus,
a shareholder may make additional investments in Fund shares at any time through
the Shareholder Investment Account  by sending a check  in any amount, not  less
than  $100, payable to Dean Witter U.S. Government Securities Trust, directly to
the Fund's Transfer Agent. In the case of Class A shares, after deduction of any
applicable sales charge,  the balance will  be applied to  the purchase of  Fund
shares,  and, in the case of shares of the other Classes, the entire amount will
be applied to the purchase of Fund shares, at the net asset value per share next
computed after receipt of the check  or purchase payment by the Transfer  Agent.
The shares so purchased will be credited to the investor's account.
 
EXCHANGE PRIVILEGE
 
   
    As discussed in the Prospectus, the Fund makes available to its shareholders
an  Exchange Privilege whereby shareholders of each  Class of shares of the Fund
may exchange their shares for  shares of the same Class  of shares of any  other
Dean  Witter Multi-Class Fund without the imposition of any exchange fee. Shares
may also be exchanged for shares of the following Funds: Dean Witter  Short-Term
U.S.  Treasury  Trust, Dean  Witter Limited  Term  Municipal Trust,  Dean Witter
Short-Term Bond Fund, Dean Witter Intermediate Term U.S. Treasury Trust and five
Dean Witter Funds  which are money  market funds (the  foregoing nine funds  are
hereinafter  referred to as  the "Exchange Funds").  Class A shares  may also be
exchanged for shares of Dean Witter Multi-State Municipal Series Trust and  Dean
Witter Hawaii Municipal Trust, which are Dean Witter Funds sold with a front-end
sales  charge ("FSC Funds"). Class B shares  may also be exchanged for shares of
Dean Witter Global Short-Term Income Fund Inc. ("Global Short-Term"), which is a
Dean Witter Fund offered with a CDSC. Exchanges may be made after the shares  of
the  Fund acquired by  purchase (not by exchange  or dividend reinvestment) have
been held for thirty days.  There is no waiting  period for exchanges of  shares
acquired  by exchange or dividend reinvestment.  An exchange will be treated for
federal income tax purposes the same as a repurchase or redemption of shares, on
which the shareholder may realize a capital gain or loss.
    
 
    Any new account  established through  the Exchange Privilege  will have  the
same registration and cash dividend or dividend reinvestment plan as the present
account,  unless  the  Transfer  Agent  receives  written  notification  to  the
contrary. For  telephone  exchanges,  the exact  registration  of  the  existing
account and the account number must be provided.
 
                                       25
<PAGE>
    Any  shares  held  in  certificate  form cannot  be  exchanged  but  must be
forwarded to the  Transfer Agent  and deposited into  the shareholder's  account
before  being eligible for exchange. (Certificates  mailed in for deposit should
not be endorsed.)
 
   
    As described below,  and in the  Prospectus under the  caption "Purchase  of
Fund  Shares," a CDSC may be imposed upon a redemption, depending on a number of
factors, including the number of years from the time of purchase until the  time
of  redemption  or exchange  ("holding period").  When shares  of a  Dean Witter
Multi-Class Fund or Global  Short-Term are exchanged for  shares of an  Exchange
Fund,  the exchange  is executed  at no charge  to the  shareholder, without the
imposition of the CDSC at  the time of the exchange.  During the period of  time
the  shareholder remains in the  Exchange Fund (calculated from  the last day of
the month in which the Exchange  Fund shares were acquired), the holding  period
or "year since purchase payment made" is frozen. When shares are redeemed out of
the  Exchange Fund, they will be subject to a CDSC which would be based upon the
period of time the shareholder held shares in a Dean Witter Multi-Class Fund  or
in  Global Short-Term. However, in the case of shares exchanged into an Exchange
Fund on or after April 23, 1990, upon a redemption of shares which results in  a
CDSC  being imposed,  a credit (not  to exceed the  amount of the  CDSC) will be
given in an amount equal to  the Exchange Fund 12b-1 distribution fees  incurred
on  or  after that  date which  are attributable  to those  shares. Shareholders
acquiring shares of  an Exchange Fund  pursuant to this  exchange privilege  may
exchange  those  shares  back into  a  Dean  Witter Multi-Class  Fund  or Global
Short-Term from the Exchange Fund, with no CDSC being imposed on such  exchange.
The holding period previously frozen when shares were first exchanged for shares
of  the Exchange Fund resumes on the last day  of the month in which shares of a
Dean Witter Multi-Class Fund or of  Global Short-Term are reacquired. A CDSC  is
imposed  only upon  an ultimate redemption,  based upon the  time (calculated as
described above) the shareholder was invested in a Dean Witter Multi-Class  Fund
or  in Global Short-Term. In  the case of exchanges of  Class A shares which are
subject to a  CDSC, the  holding period also  includes the  time (calculated  as
described above) the shareholder was invested in a FSC Fund.
    
 
   
    When  shares initially  purchased in  a Dean  Witter Multi-Class  Fund or in
Global Short-Term are exchanged  for shares of a  Dean Witter Multi-Class  Fund,
shares of Global Short-Term, shares of a FSC Fund or shares of an Exchange Fund,
the  date of purchase of the shares of  the fund exchanged into, for purposes of
the CDSC upon redemption, will be the last day of the month in which the  shares
being  exchanged were originally purchased.  In allocating the purchase payments
between funds for purposes of the CDSC, the amount which represents the  current
net  asset value of shares at the time  of the exchange which were (i) purchased
more than one, three or six years (depending on the CDSC schedule applicable  to
the shares) prior to the exchange, (ii) originally acquired through reinvestment
of  dividends or distributions and (iii) acquired  in exchange for shares of FSC
Funds, or for shares of  other Dean Witter Funds for  which shares of FSC  Funds
have  been exchanged (all  such shares called "Free  Shares"), will be exchanged
first. After an  exchange, all dividends  earned on shares  in an Exchange  Fund
will  be considered Free  Shares. If the  exchanged amount exceeds  the value of
such Free Shares, an  exchange is made, on  a block-by-block basis, of  non-Free
Shares held for the longest period of time (except that, with respect to Class B
shares,  if shares held for  identical periods of time  but subject to different
CDSC schedules are held  in the same Exchange  Privilege account, the shares  of
that  block that are subject to a lower CDSC rate will be exchanged prior to the
shares of that block that  are subject to a higher  CDSC rate). Shares equal  to
any  appreciation in the value  of non-Free Shares exchanged  will be treated as
Free Shares, and the amount of the purchase payments for the non-Free Shares  of
the fund exchanged into will be equal to the lesser of (a) the purchase payments
for, or (b) the current net asset value of, the exchanged non-Free Shares. If an
exchange  between funds would  result in exchange  of only part  of a particular
block of non-Free Shares, then shares equal to any appreciation in the value  of
the  block (up to the amount of the exchange) will be treated as Free Shares and
exchanged first, and the purchase payment for that block will be allocated on  a
pro  rata basis between the non-Free Shares of that block to be retained and the
non-Free Shares to be  exchanged. The prorated amount  of such purchase  payment
attributable to the retained non-Free Shares will remain as the purchase payment
for  such shares, and the amount of  purchase payment for the exchanged non-Free
Shares will be equal to  the lesser of (a) the  prorated amount of the  purchase
payment for, or (b) the current net asset value of,
    
 
                                       26
<PAGE>
those  exchanged non-Free  Shares. Based  upon the  procedures described  in the
Prospectus under the caption "Purchase of Fund Shares," any applicable CDSC will
be imposed upon the ultimate redemption of shares of any fund, regardless of the
number of exchanges since those shares were originally purchased.
 
    With respect to  the redemption  or repurchase of  shares of  the Fund,  the
application  of proceeds to the purchase of new  shares in the Fund or any other
of the  funds and  the general  administration of  the Exchange  Privilege,  the
Transfer  Agent  acts as  agent for  the Distributor  and for  the shareholder's
selected broker-dealer,  if  any, in  the  performance of  such  functions.  The
Transfer Agent shall be liable for its own negligence and not for the default or
negligence of its correspondents or for losses in transit. The Fund shall not be
liable  for any default or negligence of  the Transfer Agent, the Distributor or
any selected broker-dealer.
 
    The Distributor and any selected broker-dealer have authorized and appointed
the Transfer Agent to act as their  agent in connection with the application  of
proceeds of any redemption of Fund shares to the purchase of shares of any other
fund  and the general administration of the Exchange Privilege. No commission or
discounts will be paid to the Distributor or any selected broker-dealer for  any
transactions pursuant to this Exchange Privilege.
 
    Exchanges  are subject to  the minimum investment  requirement and any other
conditions imposed  by  each  fund.  (The minimum  initial  investment  for  the
Exchange  Privilege account of each Class is $5,000 for Dean Witter Liquid Asset
Fund Inc.,  Dean Witter  Tax-Free  Daily Income  Trust, Dean  Witter  California
Tax-Free  Daily Income  Trust and  Dean Witter  New York  Municipal Money Market
Trust, al-
though those funds may,  at their discretion, accept  initial investments of  as
low as $1,000. The minimum initial investment for the Exchange Privilege account
of  each  Class  is $10,000  for  Dean  Witter Short-Term  U.S.  Treasury Trust,
although that fund may,  at its discretion, may  accept initial purchases of  as
low as $5,000. The minimum initial investment for the Exchange Privilege account
of  each Class is $5,000 for Dean Witter Special Value Fund. The minimum initial
investment for the Exchange  Privilege account of each  Class of all other  Dean
Witter  Funds for  which the  Exchange Privilege  is available  is $1,000.) Upon
exchange into  an Exchange  Fund, the  shares of  that fund  will be  held in  a
special   Exchange  Privilege   Account  separately   from  accounts   of  those
shareholders who  have acquired  their  shares directly  from  that fund.  As  a
result,  certain  services normally  available to  shareholders of  those funds,
including the check  writing feature, will  not be available  for funds held  in
that account.
 
    The  Fund and each  of the other Dean  Witter Funds may  limit the number of
times this  Exchange  Privilege  may  be exercised  by  any  investor  within  a
specified  period of  time. Also,  the Exchange  Privilege may  be terminated or
revised at any time by  the Fund and/or any of  the Dean Witter Funds for  which
shares  of the Fund have been exchanged, upon  such notice as may be required by
applicable regulatory agencies (presently sixty  days' prior written notice  for
termination  or  material revision),  provided  that six  months'  prior written
notice of termination will be  given to the shareholders  who hold shares of  an
Exchange  Fund pursuant to the Exchange Privilege, and provided further that the
Exchange Privilege may  be terminated  or materially revised  without notice  at
times  (a) when the New  York Stock Exchange is  closed for other than customary
weekends and holidays, (b) when trading on that Exchange is restricted, (c) when
an emergency exists  as a result  of which  disposal by the  Fund of  securities
owned  by it is not  reasonably practicable or it  is not reasonably practicable
for the Fund fairly  to determine the  value of its net  assets, (d) during  any
other  period when  the Securities and  Exchange Commission by  order so permits
(provided that applicable rules and  regulations of the Securities and  Exchange
Commission  shall govern as to  whether the conditions prescribed  in (b) or (c)
exist) or (e)  if the  Fund would  be unable  to invest  amounts effectively  in
accordance with its investment objective, policies and restrictions.
 
    Shareholders  should  contact  their  DWR  or  other  selected broker-dealer
account executive  or  the Transfer  Agent  for further  information  about  the
Exchange Privilege.
 
                                       27
<PAGE>
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
    REDEMPTION.   As stated in the Prospectus,  shares of each Class of the Fund
can be redeemed  for cash  at any time  at the  net asset value  per share  next
determined;  however, such redemption  proceeds may be reduced  by the amount of
any applicable CDSC.  If shares are  held in a  shareholder's account without  a
share certificate, a written request for redemption to the Fund's Transfer Agent
at  P.O. Box 983, Jersey City, NJ 07303 is required. if certificates are held by
the shareholder, the  shares may  be redeemed by  surrendering the  certificates
with a written request for redemption. The share certificate, or an accompanying
stock  power, and the request for redemption,  must be signed by the shareholder
or  shareholders  exactly  as  the  shares  are  registered.  Each  request  for
redemption,  whether or not accompanied by a  share certificate, must be sent to
the Fund's Transfer Agent, which will redeem the shares at their net asset value
next computed  (see  "Purchase of  Fund  Shares"  in the  Prospectus)  after  it
receives  the request,  and certificate, if  any, in good  order. Any redemption
request received after such computation will be redeemed at the next  determined
net asset value. The term "good order" means that the share certificate, if any,
and request for redemption are properly signed, accompanied by any documentation
required  by the Transfer Agent, and  bear signature guarantees when required by
the Fund or  the Transfer Agent.  If redemption is  requested by a  corporation,
partnership,  trust or  fiduciary, the Transfer  Agent may  require that written
evidence of authority acceptable to the Transfer Agent be submitted before  such
request is accepted.
 
    Whether  certificates are held  by the shareholder  or shares are  held in a
shareholder's account, if the proceeds are to  be paid to any person other  than
the record owner, or if the proceeds are to be paid to a corporation (other than
the Distributor or a selected broker-dealer for the account of the shareholder),
partnership,  trust or fiduciary, or sent to the shareholder at an address other
than the  registered  address, signatures  must  be guaranteed  by  an  eligible
guarantor  acceptable  to the  Transfer Agent  (shareholders should  contact the
Transfer Agent for  a determination as  to whether a  particular institution  is
such  an eligible guarantor). A  stock power may be  obtained from any dealer or
commercial bank. The Fund may  change the signature guarantee requirements  from
time  to time upon notice to shareholders, which may be by means of a supplement
to the prospectus or a new prospectus.
 
    REPURCHASE.    As  stated  in   the  Prospectus,  DWR  and  other   selected
broker-dealers  are  authorized  to  repurchase shares  represented  by  a share
certificate which  is  delivered to  any  of their  offices.  Shares held  in  a
shareholder's account without a share certificate may also be repurchased by DWR
and   other  selected  broker-dealers   upon  the  telephonic   request  of  the
shareholder. The repurchase  price is the  net asset value  next computed  after
such  purchase order is received by  DWR or other selected broker-dealer reduced
by any applicable CDSC.
 
   
    PAYMENT FOR SHARES REDEEMED OR REPURCHASED.  As discussed in the Prospectus,
payment for shares of any Class  presented for repurchase or redemption will  be
made  by check  within seven  days after  receipt by  the Transfer  Agent of the
certificate and/or written request in good order. Such payment may be  postponed
or  the  right of  redemption suspended  at times  (a) when  the New  York Stock
Exchange is closed  for other  than customary  weekends and  holidays, (b)  when
trading on that Exchange is restricted, (c) when an emergency exists as a result
of  which  disposal by  the Fund  of securities  owned by  it is  not reasonably
practicable or it is not reasonably practicable for the Fund fairly to determine
the value of its net assets, or (d) during any other period when the  Securities
and  Exchange Commission by order so permits; provided that applicable rules and
regulations of the Securities and Exchange Commission shall govern as to whether
the conditions prescribed in (b) or (c) exist. If the shares to be redeemed have
recently been  purchased  by check  (including  a certified  or  bank  cashier's
check),  payment  of redemption  proceeds may  be delayed  for the  minimum time
needed to verify that the check used  for investment has been honored (not  more
than  fifteen days from the time of receipt of the check by the Transfer Agent).
It has been  and remains  the Fund's  policy and  practice that,  if checks  for
redemption  proceeds  remain  uncashed,  no  interest  will  accrue  on  amounts
represented by such  uncashed checks. Shareholders  maintaining margin  accounts
with DWR or another selected
    
 
                                       28
<PAGE>
broker-dealer  are referred to their account executive regarding restrictions on
redemption of shares of the Fund pledged in the margin accounts.
 
    TRANSFERS OF SHARES.  In the event a shareholder requests a transfer of  any
shares  to a  new registration,  such shares  will be  transferred without sales
charge at the time of  transfer. With regard to the  status of shares which  are
either subject to the CDSC or free of such charge (and with regard to the length
of  time shares subject  to the charge  have been held),  any transfer involving
less than all of the shares in an account will be made on a pro rata basis (that
is, by transferring shares  in the same proportion  that the transferred  shares
bear  to the total shares in the account immediately prior to the transfer). The
transferred shares will continue to be subject to any applicable CDSC as if they
had not been so transferred.
 
    REINSTATEMENT PRIVILEGE.  As discussed in the Prospectus, a shareholder  who
has  had  his or  her  shares redeemed  or  repurchased and  has  not previously
exercised this reinstatement  privilege may, within  35 days after  the date  of
redemption  or repurchase, reinstate any portion or  all of the proceeds of such
redemption or repurchase  in shares of  the Fund in  the same Class  at the  net
asset  value next  determined after a  reinstatement request,  together with the
proceeds, is received by the Transfer Agent.
 
    Exercise of the reinstatement privilege  will not affect the federal  income
tax  treatment of any gain  or loss realized upon  the redemption or repurchase,
except that if the redemption or repurchase resulted in a loss and reinstatement
is made in shares of the Fund, some or all of the loss, depending on the  amount
reinstated,  will not be allowed as a  deduction for federal income tax purposes
but will  be applied  to  adjust the  cost basis  of  the shares  acquired  upon
reinstatement.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    As discussed in the Prospectus, the Fund will determine either to distribute
or  to retain all  or part of  any net long-term  capital gains in  any year for
reinvestment. If any such gains are  retained, the Fund will pay federal  income
tax  thereon and  will notify  shareholders that,  following an  election by the
Fund, the shareholders will be required  to include such undistributed gains  in
determining  their taxable income and  may claim their share  of the tax paid by
the Fund as a credit against their individual federal income tax.
 
    Because the Fund intends to distribute all of its net investment income  and
capital  gains to shareholders and otherwise  continue to qualify as a regulated
investment company under Subchapter  M of the Internal  Revenue Code, it is  not
expected  that  the  Fund  will  be required  to  pay  any  federal  income tax.
Shareholders will normally have to pay federal income taxes, and any  applicable
state and/or local income taxes, on the dividends and distributions they receive
from  the Fund. Such  dividends and distributions,  to the extent  that they are
derived from net investment income or  short-term capital gains, are taxable  to
the  shareholder  as  ordinary  income  regardless  of  whether  the shareholder
receives such payments in additional shares  or in cash. Any dividends  declared
in  the last quarter of  any calendar year which are  paid in the following year
prior to February  1 will be  deemed received  by the shareholder  in the  prior
year.
 
    Gains or losses on sales of securities by the Fund will be long-term capital
gains  or losses  if the  securities have been  held by  the Fund  for more than
twelve months. Gains or losses on the sale of securities held for twelve  months
or less will be short-term gains or losses.
 
   
    Distributions  of  net  long-term  capital gains,  if  any,  are  taxable to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional shares or in cash. Capital  gains distributions are not eligible  for
the  dividends received deduction.  It is expected that  the Treasury will issue
regulations or other guidance to permit shareholders to take into account  their
proportionate  share  of the  Fund's capital  gains  distributions that  will be
subject to a reduced rate  under the Taxpayer Relief  Act of 1997. The  Taxpayer
Relief  Act reduces the maximum tax on  long-term capital gains from 28% to 20%;
however, it also lengthens the required holding period to obtain the lower  rate
from    more    than    12    months   to    more    than    18    months.   The
    
 
                                       29
<PAGE>
   
lower rates do not apply to collectibles and certain other assets. Additionally,
the maximum captial gain rate for assets that are held more than five years  and
that are acquired after December 31, 2000 is 18%.
    
 
    Net   income,  for   dividend  purposes,   includes  accrued   interest  and
amortization of original issue discount  and market discounts where  applicable,
less  the expenses of the Fund. Net  income will be calculated immediately prior
to the determination of net asset value per share of the Fund.
 
    Under current federal law,  the Fund will receive  net investment income  in
the  form of interest by virtue of  holding Treasury bills, notes and bonds, and
will recognize  income attributable  to  it from  holding zero  coupon  Treasury
securities. Current federal tax law requires that a holder (such as the Fund) of
a  zero coupon security accrue  a portion of the  discount at which the security
was purchased as  income each  year even though  the Fund  receives no  interest
payment  in cash on the security during  the year. As an investment company, the
Fund must pay  out substantially  all of its  net investment  income each  year.
Accordingly,  the  Fund,  to  the  extent it  invests  in  zero  coupon Treasury
securities, may be required to  pay out as an  income distribution each year  an
amount  which is greater than the total  amount of cash receipts of interest the
Fund actually received. Such distributions will be made from the available  cash
of  the  Fund or  by  liquidation of  portfolio  securities if  necessary.  If a
distribution of cash necessitates the  liquidation of portfolio securities,  the
Investment  Manager will select which securities to sell. The Fund may realize a
gain or loss from such sales. In  the event the Fund realizes net capital  gains
from  such  transactions, its  shareholders may  receive  a larger  capital gain
distribution, if any, than they would in the absence of such transactions.
 
    Any dividend or capital gains distribution received by a shareholder from an
investment company will have the effect of  reducing the net asset value of  the
shareholder's  stock in  that company  by the  exact amount  of the  dividend or
capital  gains  distribution.  Furthermore,  capital  gains  distributions   and
dividends  are subject to  federal income taxes.  If the net  asset value of the
shares should be reduced below a shareholder's  cost as a result of the  payment
of  dividends  or the  distribution of  realized  long-term capital  gains, such
payment or  distribution  would  be  in  part  a  return  of  the  shareholder's
investment  to the  extent of such  reduction below the  shareholder's cost, but
nonetheless would be  fully taxable at  either ordinary or  capital gain  rates.
Therefore,  an investor should consider the  tax implications of purchasing Fund
shares immediately prior to a distribution record date.
 
    Shareholders are urged to consult their attorneys or tax advisers  regarding
specific questions as to federal, state or local taxes.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
   
    As  discussed in the  Prospectus, from time  to time the  Fund may quote its
"yield" and/or its "total return" in advertisements and sales literature.  These
figures  are  computed separately  for Class  A, Class  B, Class  C and  Class D
shares. Yield is  calculated for  any 30-day period  as follows:  the amount  of
interest  income  for each  security in  the Fund's  portfolio is  determined in
accordance with regulatory  requirements; the  total for  the entire  portfolio,
adjusted  by the  gain or  loss on paydowns  during the  period, constitutes the
Fund's gross  income for  the period.  Expenses accrued  during the  period  are
subtracted  to arrive  at "net investment  income" of each  Class. The resulting
amount is divided by the product of the maximum offering price per share on  the
last  day  of the  period  multiplied by  the average  number  of shares  of the
applicable Class outstanding during the period that were entitled to  dividends.
This  amount is added to 1  and raised to the sixth  power. 1 is then subtracted
from the  result  and  the difference  is  multiplied  by 2  to  arrive  at  the
annualized  yield.  The yield  for the  30-day period  ended December  31, 1997,
calculated pursuant to the formula described above, were 6.16%, 5.93%, 5.92% and
6.69% for Class A, Class B, Class C, and Class D, respectively.
    
 
    The Fund's "average annual total return" represents an annualization of  the
Fund's  total return  over a  particular period and  is computed  by finding the
annual percentage rate  which will result  in the ending  redeemable value of  a
hypothetical  $1,000 investment made at the beginning of a one, five or ten year
period, or  for  the  period  from  the  date  of  commencement  of  the  Fund's
operations, if shorter than any of
 
                                       30
<PAGE>
   
the  foregoing. The ending redeemable value is reduced by any CDSC at the end of
the one, five or ten year or other period. For the purpose of this  calculation,
it  is assumed that all dividends  and distributions are reinvested. The formula
for computing the average annual total return involves a percentage obtained  by
dividing  the ending redeemable  value by the amount  of the initial investment,
taking a root of  the quotient (where  the root is equivalent  to the number  of
years in the period) and subtracting 1 from the result. The average annual total
returns  of Class  B for the  year ended December  31, 1997, for  the five years
ended December 31,  1997 and  for the  ten years  ended December  31, 1997  were
3.56%, 5.90% and 7.44%, respectively.
    
 
   
    For  periods of less  than one year, the  Fund quotes its  total return on a
non-annualized basis.  Accordingly, the  Fund may  compute its  aggregate  total
return  for  each of  Class A,  Class C  and  Class D  for specified  periods by
determining the aggregate percentage rate which will result in the ending  value
of a hypothetical $1,000 investment made at the beginning of the period. For the
purpose  of this calculation, it is assumed that all dividends and distributions
are reinvested.  The formula  for computing  aggregate total  return involves  a
percentage  obtained  by  dividing  the  ending  value  by  the  initial  $1,000
investment and subtracting  1 from the  result. The ending  redeemable value  is
reduced  by  any  CDSC  at  the  end  of  the  period.  Based  on  the foregoing
calculations, the total returns  for the period July  28, 1997 through  December
31,  1997  were  3.50%, 4.14%  and  3.87% for  Class  A,  Class C  and  Class D,
respectively.
    
 
   
    In addition to the  foregoing, the Fund may  advertise its total return  for
each  Class  over different  periods  of time  by  means of  aggregate, average,
year-by-year or other types  of total return figures.  Such calculations may  or
may not reflect the imposition of the maximum front-end sales charge for Class A
or  the  deduction of  the  CDSC for  each  of Class  B  and Class  C  which, if
reflected, would reduce the performance quoted. For example, the average  annual
total  return of the  Fund may be  calculated in the  manner described above but
without deduction for any  applicable sales charge.  Based on this  calculation,
the  average annual  total returns of  Class B  for the year  ended December 31,
1997, for the five  years ended December  31, 1997 and for  the ten years  ended
December 31, 1997 were 8.56%, 6.21% and 7.44%, respectively.
    
 
   
    In  addition, the Fund may compute its aggregate total return for each Class
for specified periods by  determining the aggregate  percentage rate which  will
result  in the  ending value  of a  hypothetical $1,000  investment made  at the
beginning of the period. For the purpose of this calculation, it is assumed that
all dividends  and  distributions  are reinvested.  The  formula  for  computing
aggregate  total return  involves a percentage  obtained by  dividing the ending
value (without  the  reduction for  any  sales  charge) by  the  initial  $1,000
investment   and  subtracting  1  from  the   result.  Based  on  the  foregoing
calculation, the total returns for Class B for the year ended December 31, 1997,
for the five-year  period ended December  31, 1997 and  for the ten-year  period
ended  December 31, 1997 were 8.56%,  35.14% and 104.89%, respectively. Based on
the foregoing calculations, the total returns for  Class A, Class C and Class  D
for  the period July 28  through December 31, 1997  were 3.50%, 4.14% and 3.87%,
respectively.
    
 
   
    The Fund  may  also advertise  the  growth of  hypothetical  investments  of
$10,000, $50,000 and $100,000 in each Class of shares of the Fund by adding 1 to
the  Fund's aggregate total return  to date (expressed as  a decimal and without
taking into  account the  effect  of any  applicable  CDSC) and  multiplying  by
$9,575,  $48,250 and  $97,250 in  the case of  Class A  (investments of $10,000,
$50,000 and  $100,000 adjusted  for the  initial sales  charge) or  by  $10,000,
$50,000 and $100,000 in the case of each of Class B, Class C and Class D, as the
case    may   be.   Investments   of    $10,000,   $50,000   and   $100,000   in
    
 
                                       31
<PAGE>
   
each Class  at  inception  of the  Class  would  have grown  (declined)  to  the
following amounts at December 31, 1997:
    
 
   
<TABLE>
<CAPTION>
                                                               INVESTMENT AT INCEPTION OF:
                                               INCEPTION   -----------------------------------
CLASS                                            DATE:      $10,000     $50,000     $100,000
- --------------------------------------------  -----------  ---------  -----------  -----------
<S>                                           <C>          <C>        <C>          <C>
Class A.....................................     7/28/97   $   9,910  $    49,939  $   100,654
Class B.....................................     6/29/84      29,126      145,630      291,260
Class C.....................................     7/28/97      10,414       52,070      104,140
Class D.....................................     7/28/97      10,387       51,935      103,870
</TABLE>
    
 
    The  Fund from time to  time may also advertise  its performance relative to
certain performance rankings and indexes compiled by independent organizations.
 
DESCRIPTION OF SHARES OF THE FUND
- --------------------------------------------------------------------------------
 
   
    The shareholders of the Fund are entitled to a full vote for each full share
held. All of the  Trustees have been  elected by the  shareholders of the  Fund,
most  recently at a  Special Meeting of  Shareholders held on  May 21, 1997. The
Fund is  authorized  to  issue  an unlimited  number  of  shares  of  beneficial
interest.  The Trustees themselves  have the power  to alter the  number and the
terms of office of the Trustees (as  provided for in the Declaration of  Trust),
and  they  may at  any time  lengthen their  own  terms or  make their  terms of
unlimited duration and  appoint their  own successors, provided  that always  at
least  a majority of  the Trustees has  been elected by  the shareholders of the
Fund. Under certain circumstances the Trustees  may be removed by action of  the
Trustees.  The shareholders also  have the right  under certain circumstances to
remove the Trustees. The  voting rights of shareholders  are not cumulative,  so
that  holders of more than 50 percent of  the shares voting can, if they choose,
elect all Trustees  being selected, while  the holders of  the remaining  shares
would be unable to elect any Trustees.
    
 
    The  Declaration of Trust permits the  Trustees to authorize the creation of
additional series  of  shares  (the  proceeds of  which  would  be  invested  in
separate,  independently managed  portfolios) and  additional classes  of shares
within any  series (which  would be  used  to distinguish  among the  rights  of
different categories of shareholders, as might be required by future regulations
or  other unforeseen circumstances).  The Trustees have  not authorized any such
additional series  or  classes  of  shares  other  than  as  set  forth  in  the
Prospectus.
 
    The Declaration of Trust further provides that no Trustee, officer, employee
or  agent of  the Fund is  liable to the  Fund or  to a shareholder,  nor is any
Trustee, officer, employee or  agent liable to any  third persons in  connection
with the affairs of the Fund, except as such liability may arise from his/her or
its  own bad faith, willful misfeasance, gross negligence, or reckless disregard
of his duties. It also provides that all third persons shall look solely to  the
Fund  property for satisfaction of claims arising in connection with the affairs
of the Fund. With the exceptions stated, the Declaration of Trust provides  that
a  Trustee, officer, employee or agent is entitled to be indemnified against all
liability in connection with the affairs of the Fund.
 
    The Fund is authorized to issue an unlimited number of shares of  beneficial
interest.  The Fund shall be of unlimited  duration subject to the provisions in
the Declaration of Trust concerning termination by action of the shareholders.
 
CUSTODIAN AND TRANSFER AGENT
- --------------------------------------------------------------------------------
 
    The Bank of New York, 90 Washington Street, New York, New York 10286 is  the
Custodian  of  the Fund's  assets.  Any of  the  Fund's cash  balances  with the
Custodian in excess of  $100,000 are unprotected  by federal deposit  insurance.
Such balances may, at times, be substantial.
 
   
    Morgan  Stanley Dean Witter  Trust FSB ("MSDW  Trust"), Harborside Financial
Center, Plaza Two, Jersey City,  New Jersey 07311 is  the Transfer Agent of  the
Fund's  shares  and  Dividend  Disbursing Agent  for  payment  of  dividends and
distributions  on  Fund  shares  and   Agent  for  shareholders  under   various
    
 
                                       32
<PAGE>
   
investment  plans described  herein. MSDW Trust  is an affiliate  of Dean Witter
InterCapital  Inc.,  the   Fund's  Investment  Manager,   and  of  Dean   Witter
Distributors  Inc.,  the  Fund's  Distributor. As  Transfer  Agent  and Dividend
Disbursing Agent, MSDW Trust's responsibilities include maintaining  shareholder
accounts,  disbursing  cash  dividends  and  reinvesting  dividends,  processing
account registration  changes, handling  purchase and  redemption  transactions,
mailing  prospectuses and  reports, mailing  and tabulating  proxies, processing
share certificate transactions, and  maintaining shareholder records and  lists.
For  these services MSDW Trust  receives a per shareholder  account fee from the
Fund.
    
 
INDEPENDENT ACCOUNTANTS
- --------------------------------------------------------------------------------
 
    Price Waterhouse LLP serves as the independent accountants of the Fund.  The
independent  accountants  are  responsible  for  auditing  the  annual financial
statements of the Fund.
 
REPORTS TO SHAREHOLDERS
- --------------------------------------------------------------------------------
 
    The Fund will send to shareholders, at least semi-annually, reports  showing
the  Fund's  portfolio  and  other  information.  An  annual  report, containing
financial statements  audited  by  independent  accountants,  will  be  sent  to
shareholders each year.
 
    The  Fund's fiscal year ends on December 31. The financial statements of the
Fund must  be audited  at least  once a  year by  independent accountants  whose
selection is made annually by the Fund's Board of Trustees.
 
LEGAL COUNSEL
- --------------------------------------------------------------------------------
 
    Barry  Fink, Esq., who is  an officer and General  Counsel of the Investment
Manager, is an officer and General Counsel of the Fund.
 
EXPERTS
- --------------------------------------------------------------------------------
 
   
    The annual financial statements of the Fund for the year ended December  31,
1997,  which  are  included  in this  Statement  of  Additional  Information and
incorporated  by  reference  in  the  Prospectus,  have  been  so  included  and
incorporated  in reliance  on the  report of  Price Waterhouse  LLP, independent
accountants, given on  the authority  of said firm  as experts  in auditing  and
accounting.
    
 
REGISTRATION STATEMENT
- --------------------------------------------------------------------------------
 
    This  Statement of Additional Information and  the Prospectus do not contain
all of the  information set  forth in the  Registration Statement  the Fund  has
filed  with the  Securities and  Exchange Commission.  The complete Registration
Statement may  be obtained  from  the Securities  and Exchange  Commission  upon
payment of the fee prescribed by the rules and regulations of the Commission.
 
                                       33
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
REPORT OF INDEPENDENT ACCOUNTANTS
 
TO THE SHAREHOLDERS AND TRUSTEES
OF DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
 
In our opinion, the accompanying statement of assets and liabilities, including
the portfolio of investments, and the related statements of operations and of
changes in net assets and the financial highlights present fairly, in all
material respects, the financial position of Dean Witter U.S. Government
Securities Trust (the "Fund") at December 31, 1997, the results of its
operations for the year then ended, the changes in its net assets for each of
the two years in the period then ended and the financial highlights for each of
the periods presented, in conformity with generally accepted accounting
principles. These financial statements and financial highlights (hereafter
referred to as "financial statements") are the responsibility of the Fund'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 December 31, 1997 by correspondence with the
custodian, provide a reasonable basis for the opinion expressed above.
 
PRICE WATERHOUSE LLP
1177 AVENUE OF THE AMERICAS
NEW YORK, NEW YORK 10036
FEBRUARY 9, 1998
 
                                       34
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
PRINCIPAL                                       DESCRIPTION
AMOUNT IN                                           AND                                           COUPON
THOUSANDS                                      MATURITY DATE                                      RATE        VALUE
- ------------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                                                   <C>     <C>
            MORTGAGE-BACKED SECURITIES (77.1%)
            Government National Mortgage Assoc. I (76.1%)
$  320,542  10/15/22 - 02/15/24.................................................................   6.50%  $  317,236,160
 1,682,261  04/15/17 - 04/15/26.................................................................   7.00    1,695,929,120
   842,318  11/15/02 - 06/15/27.................................................................   7.50      863,112,493
   325,793  10/15/16 - 07/15/26.................................................................   8.00      337,806,278
   325,080  07/15/06 - 04/15/25.................................................................   8.50      341,435,525
   233,471  10/15/08 - 08/15/21.................................................................   9.00      249,667,923
   157,340  10/15/09 - 12/15/20.................................................................   9.50      170,221,960
   170,531  11/15/09 - 11/15/20.................................................................  10.00      185,771,705
       457  05/15/10 - 06/15/15.................................................................  12.50          523,189
                                                                                                          --------------
                                                                                                           4,161,704,353
                                                                                                          --------------
 
            Government National Mortgage Assoc. II (0.8%)
    45,149  01/20/24 - 02/20/24.................................................................   6.50       44,429,793
                                                                                                          --------------
 
            Government National Mortgage Assoc. GPM I (0.2%)
     7,022  08/15/13 - 09/15/15.................................................................  12.25        8,130,656
                                                                                                          --------------
 
            TOTAL MORTGAGE-BACKED SECURITIES
            (IDENTIFIED COST $4,097,770,804)...........................................................    4,214,264,802
                                                                                                          --------------
 
            U.S. GOVERNMENT OBLIGATIONS (15.3%)
            U.S. Treasury Notes (3.1%)
    10,000  08/15/07............................................................................  6.125       10,277,100
    10,000  02/15/07............................................................................   6.25       10,319,800
   149,100  04/15/98............................................................................  7.875      150,082,569
                                                                                                          --------------
                                                                                                             170,679,469
                                                                                                          --------------
 
            U.S. Treasury Principal Strips (12.2%)
   123,000  02/15/04............................................................................   0.00       86,777,730
   380,000  05/15/04............................................................................   0.00      264,126,600
   385,000  08/15/04............................................................................   0.00      263,859,750
    75,000  11/15/04............................................................................   0.00       50,612,250
                                                                                                          --------------
                                                                                                             665,376,330
                                                                                                          --------------
 
            TOTAL U.S. GOVERNMENT OBLIGATIONS
            (IDENTIFIED COST $734,103,884).............................................................      836,055,799
                                                                                                          --------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       35
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS DECEMBER 31, 1997, CONTINUED
 
<TABLE>
<CAPTION>
PRINCIPAL                                       DESCRIPTION
AMOUNT IN                                           AND                                           COUPON
THOUSANDS                                      MATURITY DATE                                      RATE        VALUE
- ------------------------------------------------------------------------------------------------------------------------
<C>         <S>                                                                                   <C>     <C>
            U.S. GOVERNMENT AGENCIES (7.5%)
            Resolution Funding Corp. Zero Coupon Strips
$   33,500  07/15/02............................................................................   0.00%  $   25,808,400
     5,049  10/15/02............................................................................   0.00        3,831,383
   109,000  04/15/03............................................................................   0.00       80,065,950
    55,000  07/15/03............................................................................   0.00       39,815,050
    69,000  10/15/03............................................................................   0.00       49,193,550
    89,882  01/15/04............................................................................   0.00       63,143,903
    84,419  04/15/04............................................................................   0.00       58,412,883
    68,000  07/15/04............................................................................   0.00       46,370,560
    18,000  07/15/07............................................................................   0.00       10,285,200
    56,000  10/15/07............................................................................   0.00       31,505,040
                                                                                                          --------------
</TABLE>
 
<TABLE>
<S>                                                                                       <C>     <C>
TOTAL U.S. GOVERNMENT AGENCIES
(IDENTIFIED COST $365,841,937)..........................................................              408,431,919
                                                                                                  ---------------
 
TOTAL INVESTMENTS
(IDENTIFIED COST $5,197,716,625) (A)....................................................   99.9 %   5,458,752,520
 
CASH AND OTHER ASSETS IN EXCESS OF LIABILITIES..........................................    0.1         6,663,774
                                                                                          ------  ---------------
 
NET ASSETS..............................................................................  100.0 % $ 5,465,416,294
                                                                                          ------  ---------------
                                                                                          ------  ---------------
</TABLE>
 
- ---------------------
 
GPM  Graduated Payment Mortgage.
(a)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $264,369,394 and the
     aggregate gross unrealized depreciation is $3,333,499, resulting in net
     unrealized appreciation of $261,035,895.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       36
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
FINANCIAL STATEMENTS
 
STATEMENT OF ASSETS AND LIABILITIES
DECEMBER 31, 1997
 
<TABLE>
<S>                                                                                          <C>
ASSETS:
Investments in securities, at value
  (identified cost $5,197,716,625).........................................................  $ 5,458,752,520
Cash.......................................................................................          160,038
Receivable for:
    Interest...............................................................................       29,010,778
    Shares of beneficial interest sold.....................................................        2,655,105
Prepaid expenses and other assets..........................................................           73,731
                                                                                             ---------------
     TOTAL ASSETS..........................................................................    5,490,652,172
                                                                                             ---------------
LIABILITIES:
Payable for:
    Dividends and distributions to shareholders............................................       15,835,163
    Plan of distribution fee...............................................................        3,703,798
    Shares of beneficial interest repurchased..............................................        3,112,142
    Investment management fee..............................................................        2,131,197
Accrued expenses...........................................................................          453,578
                                                                                             ---------------
     TOTAL LIABILITIES.....................................................................       25,235,878
                                                                                             ---------------
     NET ASSETS............................................................................  $ 5,465,416,294
                                                                                             ---------------
                                                                                             ---------------
COMPOSITION OF NET ASSETS:
Paid-in-capital............................................................................  $ 6,228,468,468
Net unrealized appreciation................................................................      261,035,895
Accumulated net realized loss..............................................................   (1,024,088,069)
                                                                                             ---------------
     NET ASSETS............................................................................  $ 5,465,416,294
                                                                                             ---------------
                                                                                             ---------------
CLASS A SHARES:
Net Assets.................................................................................      $20,841,089
Shares Outstanding (UNLIMITED AUTHORIZED, $.01 PAR VALUE)..................................        2,292,255
     NET ASSET VALUE PER SHARE.............................................................            $9.09
                                                                                             ---------------
                                                                                             ---------------
 
     MAXIMUM OFFERING PRICE PER SHARE,
       (NET ASSET VALUE PLUS 4.44% OF NET ASSET VALUE).....................................            $9.49
                                                                                             ---------------
                                                                                             ---------------
CLASS B SHARES:
Net Assets.................................................................................   $5,428,823,433
Shares Outstanding (UNLIMITED AUTHORIZED, $.01 PAR VALUE)..................................      596,277,853
     NET ASSET VALUE PER SHARE.............................................................            $9.10
                                                                                             ---------------
                                                                                             ---------------
CLASS C SHARES:
Net Assets.................................................................................       $4,384,815
Shares Outstanding (UNLIMITED AUTHORIZED, $.01 PAR VALUE)..................................          478,135
     NET ASSET VALUE PER SHARE.............................................................            $9.17
                                                                                             ---------------
                                                                                             ---------------
CLASS D SHARES:
Net Assets.................................................................................      $11,366,957
Shares Outstanding (UNLIMITED AUTHORIZED, $.01 PAR VALUE)..................................        1,248,136
     NET ASSET VALUE PER SHARE.............................................................            $9.11
                                                                                             ---------------
                                                                                             ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       37
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF OPERATIONS
FOR THE YEAR ENDED DECEMBER 31, 1997*
 
<TABLE>
<S>                                                                                             <C>
NET INVESTMENT INCOME:
 
INTEREST INCOME...............................................................................  $437,653,070
                                                                                                ------------
 
EXPENSES
Plan of distribution fee (Class A shares).....................................................        13,027
Plan of distribution fee (Class B shares).....................................................    43,758,596
Plan of distribution fee (Class C shares).....................................................         7,914
Investment management fee.....................................................................    24,916,951
Transfer agent fees and expenses..............................................................     3,763,233
Custodian fees................................................................................       890,060
Shareholder reports and notices...............................................................       197,342
Registration fees.............................................................................       127,534
Professional fees.............................................................................        85,861
Trustees' fees and expenses...................................................................        13,950
Other.........................................................................................        78,135
                                                                                                ------------
 
     TOTAL EXPENSES...........................................................................    73,852,603
                                                                                                ------------
 
     NET INVESTMENT INCOME....................................................................   363,800,467
                                                                                                ------------
 
NET REALIZED AND UNREALIZED GAIN (LOSS):
Net realized loss.............................................................................    (3,836,410)
Net change in unrealized appreciation.........................................................   118,550,225
                                                                                                ------------
 
     NET GAIN.................................................................................   114,713,815
                                                                                                ------------
 
NET INCREASE..................................................................................  $478,514,282
                                                                                                ------------
                                                                                                ------------
</TABLE>
 
- ---------------------
 
 *   Class A, Class C and Class D shares were issued July 28, 1997.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       38
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                                                          FOR THE YEAR       FOR THE YEAR
                                                                              ENDED              ENDED
                                                                        DECEMBER 31,1997*  DECEMBER 31, 1996
- ------------------------------------------------------------------------------------------------------------
<S>                                                                     <C>                <C>
 
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income.................................................  $     363,800,467  $     445,096,615
Net realized loss.....................................................         (3,836,410)       (18,950,945)
Net change in unrealized appreciation.................................        118,550,225       (237,138,336)
                                                                        -----------------  -----------------
 
     NET INCREASE.....................................................        478,514,282        189,007,334
                                                                        -----------------  -----------------
 
DIVIDENDS TO SHAREHOLDERS FROM NET INVESTMENT INCOME:
Class A shares........................................................           (342,413)        --
Class B shares........................................................       (363,065,315)      (447,472,130)
Class C shares........................................................            (61,336)        --
Class D shares........................................................           (326,681)        --
                                                                        -----------------  -----------------
 
     TOTAL............................................................       (363,795,745)      (447,472,130)
                                                                        -----------------  -----------------
Net decrease from transactions in shares of beneficial interest.......     (1,098,840,399)    (1,246,903,069)
                                                                        -----------------  -----------------
 
     NET DECREASE.....................................................       (984,121,862)    (1,505,367,865)
 
NET ASSETS:
Beginning of period...................................................      6,449,538,156      7,954,906,021
                                                                        -----------------  -----------------
 
     END OF PERIOD
    (INCLUDING DIVIDENDS IN EXCESS OF NET INVESTMENT INCOME OF $0 AND
    $4,722, RESPECTIVELY).............................................  $   5,465,416,294  $   6,449,538,156
                                                                        -----------------  -----------------
                                                                        -----------------  -----------------
</TABLE>
 
- ---------------------
 
 *   Class A, Class C and Class D shares were issued July 28, 1997.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       39
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1997
 
1. ORGANIZATION AND ACCOUNTING POLICIES
 
Dean Witter U.S. Government Securities Trust (the "Fund") is registered under
the Investment Company Act of 1940, as amended (the "Act"), as a diversified,
open-end management investment company. The Fund's investment objective is high
current income consistent with safety of principal. The Fund seeks to achieve
its objective by investing in obligations issued or guaranteed by the U.S.
Government or its instrumentalities. The Fund was organized as a Massachusetts
business trust on September 29, 1983 and commenced operations on June 29, 1984.
On July 28, 1997, the Fund commenced offering three additional classes of
shares, with the then current shares, other than shares held by certain employee
benefit plans established by Dean Witter Reynolds Inc. and its affiliate, SPS
Transaction Services, Inc., designated as Class B shares. Shares held by those
employee benefit plans prior to July 28, 1997 have been designated Class D
shares.
 
The Fund offers Class A shares, Class B shares, Class C shares and Class D
shares. The four classes are substantially the same except that most Class A
shares are subject to a sales charge imposed at the time of purchase, some Class
A shares, and most Class B shares and Class C shares are subject to a contingent
deferred sales charge imposed on shares redeemed within one year, six years and
one year, respectively. Class D shares are not subject to a sales charge.
Additionally, Class A shares, Class B shares and Class C shares incur
distribution expenses.
 
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) all portfolio securities for which
over-the-counter market quotations are readily available are valued at the
latest available bid price prior to the time of valuation; (2) when market
quotations are not readily available, including circumstances under which it is
determined by Dean Witter InterCapital Inc. (the "Investment Manager") that sale
or bid prices are not reflective of a security's market value, portfolio
securities are valued at their fair value as determined in good faith under
procedures established by and under the general supervision of the Trustees
(valuation of debt securities for which market quotations are not readily
available may be based upon current market prices of securities which are
comparable in coupon, rating and maturity or an appropriate matrix utilizing
similar factors); and (3) certain portfolio securities may be valued by an
outside pricing service approved by the Trustees. The pricing service may
utilize a matrix system incorporating security quality, maturity and coupon as
the evaluation model parameters,
 
                                       40
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1997, CONTINUED
 
and/or research and evaluations by its staff, including review of broker-dealer
market price quotations, if available, in determining what it believes is the
fair valuation of the securities valued by such pricing service; (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 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.
Discounts are accreted over the life of the respective securities. Interest
income is accrued daily.
 
C. MULTIPLE CLASS ALLOCATIONS -- Investment income, expenses (other than
distribution fees), and realized and unrealized gains and losses are allocated
to each class of shares based upon the relative net asset value on the date such
items are recognized. Distribution fees are charged directly to the respective
class.
 
D. FEDERAL INCOME TAX STATUS -- It is the Fund'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 Fund 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
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.
 
                                       41
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1997, CONTINUED
 
2. INVESTMENT MANAGEMENT AGREEMENT
 
Pursuant to an Investment Management Agreement with the Investment Manager, the
Fund pays the Investment Manager a management fee, accrued daily and payable
monthly, by applying the following annual rates to the Fund's net assets
determined at the close of each business day: 0.50% to the portion of daily net
assets not exceeding $1 billion; 0.475% to the portion of daily net assets
exceeding $1 billion but not exceeding $1.5 billion; 0.45% to the portion of
daily net assets exceeding $1.5 billion but not exceeding $2 billion; 0.425% to
the portion of daily net assets exceeding $2 billion but not exceeding $2.5
billion; 0.40% to the portion of daily net assets exceeding $2.5 billion but not
exceeding $5 billion; 0.375% to the portion of daily net assets exceeding $5
billion but not exceeding $7.5 billion; 0.35% to the portion of daily net assets
exceeding $7.5 billion but not exceeding $10 billion; 0.325% to the portion of
daily net assets exceeding $10 billion but not exceeding $12.5 billion; and
0.30% to the portion of daily net assets exceeding $12.5 billion.
 
Under the terms of the Agreement, in addition to managing the Fund's
investments, the Investment Manager maintains certain of the Fund'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 Fund who are employees of the Investment
Manager. The Investment Manager also bears the cost of telephone services, heat,
light, power and other utilities provided to the Fund.
 
3. PLAN OF DISTRIBUTION
 
Shares of the Fund are distributed by Dean Witter Distributors Inc. (the
"Distributor"), an affiliate of the Investment Manager. The Fund has adopted a
Plan of Distribution (the "Plan") pursuant to Rule 12b-1 under the Act. The Plan
provides that the Fund will pay the Distributor a fee which is accrued daily and
paid monthly at the following annual rates: (i) Class A -- up to 0.25% of the
average daily net assets of Class A; (ii) Class B -- 0.75% (0.65% on amounts
over $10 billion) of the lesser of: (a) the average daily aggregate gross sales
of the Class B shares since the inception of the Fund (not including
reinvestment of dividend or capital gain distributions) less the average daily
aggregate net asset value of the Class B shares redeemed since the Fund's
inception upon which a contingent deferred sales charge has been imposed or
waived; or (b) the average daily net assets of Class B; and (iii) Class C -- up
to 0.75% of the average daily net assets of Class C. In the case of Class A
shares, amounts paid under the Plan are paid to the Distributor for services
provided. In the case of Class B and Class C shares, amounts paid under the Plan
are paid to the Distributor for services provided and the expenses borne by it
and others in the distribution of the shares of these
 
                                       42
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1997, CONTINUED
 
Classes, including the payment of commissions for sales of these Classes and
incentive compensation to, and expenses of, the account executives of Dean
Witter Reynolds Inc. ("DWR"), an affiliate of the Investment Manager and
Distributor, and others who engage in or support distribution of the shares or
who service shareholder accounts, including overhead and telephone expenses;
printing and distribution of prospectuses and reports used in connection with
the offering of these shares to other than current shareholders; and
preparation, printing and distribution of sales literature and advertising
materials. In addition, the Distributor may utilize fees paid pursuant to the
Plan, in the case of Class B shares, to compensate DWR and other selected
broker-dealers for their opportunity costs in advancing such amounts, which
compensation would be in the form of a carrying charge on any unreimbursed
expenses.
 
In the case of Class B shares, provided that the Plan continues in effect, any
cumulative expenses incurred by the Distributor but not yet recovered may be
recovered through the payment of future distribution fees from the Fund pursuant
to the Plan and contingent deferred sales charges paid by investors upon
redemption of Class B shares. Although there is no legal obligation for the Fund
to pay expenses incurred in excess of payments made to the Distributor under the
Plan and the proceeds of contingent deferred sales charges paid by investors
upon redemption of shares, if for any reason the Plan is terminated, the
Trustees will consider at that time the manner in which to treat such expenses.
The Distributor has advised the Fund that such excess amounts, including
carrying charges, totaled $34,202,402 at December 31, 1997.
 
In the case of Class A shares and Class C shares, expenses incurred pursuant to
the Plan in any calendar year in excess of 0.25% or 0.75% of the average daily
net assets of Class A or Class C, respectively, will not be reimbursed by the
Fund through payments in any subsequent year, except that expenses representing
a gross sales credit to account executives may be reimbursed in the subsequent
calendar year. For the period ended December 31, 1997, the distribution fee was
accrued for Class A shares and Class C shares at the annual rate of 0.25% and
0.75%, respectively.
 
The Distributor has informed the Fund that for the year ended December 31, 1997,
it received contingent deferred sales charges from certain redemptions of the
Fund's Class A shares, Class B shares and Class C shares of $25, $5,836,190 and
$7,040, respectively and received $159,161 in front-end sales charges from sales
of the Fund's Class A shares. The respective shareholders pay such charges which
are not an expense of the Fund.
 
                                       43
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1997, CONTINUED
 
4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
 
The costs of purchases and sales/prepayments of portfolio securities, excluding
short-term investments, for the year ended December 31, 1997 were $230,029,244
and $1,421,599,531, respectively.
 
Dean Witter Trust FSB, an affiliate of the Investment Manager and Distributor,
is the Fund's transfer agent. At December 31, 1997, the Fund had transfer agent
fees and expenses payable of approximately $151,000.
 
The Fund has an unfunded noncontributory defined benefit pension plan covering
all independent Trustees of the Fund who will have served as independent
Trustees for at least five years at the time of retirement. Benefits under this
plan are based on years of service and compensation during the last five years
of service. Aggregate pension costs for the year ended December 31, 1997
included in Trustees' fees and expenses in the Statement of Operations amounted
to $2,435. At December 31, 1997, the Fund had an accrued pension liability of
$49,587 included in accrued expenses in the Statement of Assets and Liabilities.
 
5. FEDERAL INCOME TAX STATUS
 
At December 31, 1997, the Fund had a net capital loss carryover of approximately
$1,022,594,000, which may be used to offset future capital gains to the extent
provided by regulations which is available through December 31 of the following
years:
 
<TABLE>
<CAPTION>
                                                 IN THOUSANDS
- --------------------------------------------------------------------------------------------------------------
    1998           1999           2000           2001           2002          2003         2004        2005
- -------------  -------------  -------------  -------------  -------------  -----------  -----------  ---------
<S>            <C>            <C>            <C>            <C>            <C>          <C>          <C>
$     108,731  $     261,525  $     154,964  $     263,492  $     118,056  $    63,667  $    49,153  $   3,006
- -------------  -------------  -------------  -------------  -------------  -----------  -----------  ---------
- -------------  -------------  -------------  -------------  -------------  -----------  -----------  ---------
</TABLE>
 
Capital losses incurred after October 31 ("post-October" losses) within the
taxable year are deemed to arise on the first business day of the Fund's next
taxable year. The Fund incurred and will elect to defer net capital losses of
approximately $1,418,000 during fiscal 1997.
 
At December 31, 1997, the Fund had temporary book/tax differences primarily
attributable to post-October losses and permanent book/tax differences
attributable to an expired capital loss carryover. To reflect reclassifications
arising from the permanent differences, accumulated net realized loss was
credited and paid-in-capital was charged $270,986,532.
 
                                       44
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1997, CONTINUED
 
6. SHARES OF BENEFICIAL INTEREST
 
Transactions in shares of beneficial interest were as follows:
 
<TABLE>
<CAPTION>
                                                                       FOR THE YEAR                     FOR THE YEAR
                                                                          ENDED                            ENDED
                                                                    DECEMBER 31, 1997+               DECEMBER 31, 1996
                                                              ------------------------------   ------------------------------
                                                                 SHARES           AMOUNT          SHARES           AMOUNT
                                                              -------------   --------------   -------------   --------------
<S>                                                           <C>             <C>              <C>             <C>
CLASS A SHARES*
Sold........................................................      2,724,542   $   24,540,441        --               --
Reinvestment of dividends...................................          7,949           72,059        --               --
Redeemed....................................................       (440,236)      (3,982,964)       --               --
                                                              -------------   --------------   -------------   --------------
Net increase - Class A......................................      2,292,255       20,629,536        --               --
                                                              -------------   --------------   -------------   --------------
 
CLASS B SHARES
Sold........................................................     67,708,563      606,120,050      44,291,927   $  394,473,930
Reinvestment of dividends...................................     20,782,743      185,683,576      25,980,320      230,960,458
Redeemed....................................................   (214,633,493)  (1,917,929,811)   (210,573,457)  (1,872,337,457)
                                                              -------------   --------------   -------------   --------------
Net decrease - Class B......................................   (126,142,187)  (1,126,126,185)   (140,301,210)  (1,246,903,069)
                                                              -------------   --------------   -------------   --------------
 
CLASS C SHARES*
Sold........................................................        552,334        5,029,381        --               --
Reinvestment of dividends...................................          4,930           45,056        --               --
Redeemed....................................................        (79,129)        (724,422)       --               --
                                                              -------------   --------------   -------------   --------------
Net increase - Class C......................................        478,135        4,350,015        --               --
                                                              -------------   --------------   -------------   --------------
 
CLASS D SHARES*
Sold........................................................        324,174        2,938,529        --               --
Reinvestment of dividends...................................         34,780          314,925        --               --
Redeemed....................................................       (104,962)        (947,219)       --               --
                                                              -------------   --------------   -------------   --------------
Net increase - Class D......................................        253,992        2,306,235        --               --
                                                              -------------   --------------   -------------   --------------
Net decrease in Fund........................................   (123,117,805)  $(1,098,840,399)  (140,301,210)  $(1,246,903,069)
                                                              -------------   --------------   -------------   --------------
                                                              -------------   --------------   -------------   --------------
</TABLE>
 
- ---------------------
 
 +   On July 28, 1997, 994,144 shares representing $8,977,118 were transferred
     to Class D.
 *   For the period July 28, 1997 (issue date) through December 31, 1997.
 
                                       45
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES 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 DECEMBER 31
                          --------------------------------------------------------------------------------------------------
                           1997*      1996      1995      1994      1993      1992      1991      1990      1989      1988
- ----------------------------------------------------------------------------------------------------------------------------
 
<S>                       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
CLASS B SHARES
 
PER SHARE OPERATING
PERFORMANCE:
 
Net asset value,
 beginning of period..... $   8.92  $   9.21  $   8.41  $   9.31  $   9.30  $   9.52  $   9.37  $   9.51  $   9.42  $   9.75
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
 
Net investment income....     0.56      0.56      0.57      0.58      0.64      0.74      0.87      0.90      0.91      0.97
 
Net realized and
 unrealized gain
 (loss)..................     0.18     (0.29)     0.80     (0.90)     0.01     (0.22)     0.15     (0.14)     0.09     (0.33)
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
 
Total from investment
 operations..............     0.74      0.27      1.37     (0.32)     0.65      0.52      1.02      0.76      1.00      0.64
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
 
Less dividends from net
 investment income.......    (0.56)    (0.56)    (0.57)    (0.58)    (0.64)    (0.74)    (0.87)    (0.90)    (0.91)    (0.97)
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
 
Net asset value, end of
 period.................. $   9.10  $   8.92  $   9.21  $   8.41  $   9.31  $   9.30  $   9.52  $   9.37  $   9.51  $   9.42
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
                          --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
 
TOTAL INVESTMENT
RETURN+..................     8.56%     3.16%    16.74%    (3.51)%     7.13%     5.76%    11.43%     8.49%    11.10%     6.74%
 
RATIOS TO AVERAGE NET
ASSETS:
Expenses.................     1.26%     1.25%     1.24%     1.22%     1.18%     1.20%     1.17%     1.23%     1.19%     1.21%
 
Net investment income....     6.22%     6.28%     6.44%     6.57%     6.78%     7.91%     9.23%     9.60%     9.62%    10.01%
 
SUPPLEMENTAL DATA:
Net assets, end of
 period, in millions.....   $5,429    $6,450    $7,955    $8,211   $12,235   $12,484   $11,736    $9,829   $10,167   $10,366
 
Portfolio turnover
 rate....................        4%        8%       14%       26%       32%       40%      104%       54%       44%       15%
</TABLE>
 
- ---------------------
 
 *   Prior to July 28, 1997, the Fund issued one class of shares. All shares of
     the Fund held prior to that date, other than shares held by certain
     employee benefit plans established by Dean Witter Reynolds Inc. and its
     affiliate, SPS Transaction Services, Inc., have been designated Class B
     shares. Shares held by those employee benefit plans prior to July 28, 1997
     have been designated Class D shares.
 +   Does not reflect the deduction of sales charge. Calculated based on the net
     asset value as of the last business day of the period.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                       46
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
FINANCIAL HIGHLIGHTS, CONTINUED
 
<TABLE>
<CAPTION>
                                                                         FOR THE PERIOD
                                                                         JULY 28, 1997*
                                                                            THROUGH
                                                                          DECEMBER 31,
                                                                              1997
- ----------------------------------------------------------------------------------------
<S>                                                                     <C>
CLASS A SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................      $  9.03
                                                                             ------
Net investment income.................................................         0.25
Net realized and unrealized gain......................................         0.06
                                                                             ------
Total from investment operations......................................         0.31
                                                                             ------
Less dividends from net investment income.............................        (0.25)
                                                                             ------
Net asset value, end of period........................................      $  9.09
                                                                             ------
                                                                             ------
TOTAL INVESTMENT RETURN+..............................................         3.50%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         0.77%(2)
Net investment income.................................................         6.57%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...............................      $20,841
Portfolio turnover rate...............................................            4%
</TABLE>
 
<TABLE>
<S>                                                                     <C>
CLASS C SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................      $  9.03
                                                                             ------
Net investment income.................................................         0.23
Net realized and unrealized gain......................................         0.14
                                                                             ------
Total from investment operations......................................         0.37
                                                                             ------
Less dividends from net investment income.............................        (0.23)
                                                                             ------
Net asset value, end of period........................................      $  9.17
                                                                             ------
                                                                             ------
TOTAL INVESTMENT RETURN+..............................................         4.14%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         1.25%(2)
Net investment income.................................................         5.81%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...............................       $4,385
Portfolio turnover rate...............................................            4%
</TABLE>
 
- ---------------------
 
 *   The date shares were issued.
 +   Does not reflect the deduction of sales charge. Calculated based on the net
     asset value as of the last business day of the period.
(1)  Not annualized.
(2)  Annualized.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                       47
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
FINANCIAL HIGHLIGHTS, CONTINUED
 
<TABLE>
<CAPTION>
                                                                         FOR THE PERIOD
                                                                         JULY 28, 1997*
                                                                            THROUGH
                                                                          DECEMBER 31,
                                                                              1997
- ----------------------------------------------------------------------------------------
 
<S>                                                                     <C>
CLASS D SHARES
 
PER SHARE OPERATING PERFORMANCE:
 
Net asset value, beginning of period..................................      $  9.03
                                                                             ------
 
Net investment income.................................................         0.27
 
Net realized and unrealized gain......................................         0.08
                                                                             ------
 
Total from investment operations......................................         0.35
                                                                             ------
 
Less dividends from net investment income.............................        (0.27)
                                                                             ------
 
Net asset value, end of period........................................      $  9.11
                                                                             ------
                                                                             ------
 
TOTAL INVESTMENT RETURN+..............................................         3.87%(1)
 
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         0.52%(2)
 
Net investment income.................................................         6.91%(2)
 
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...............................      $11,367
 
Portfolio turnover rate...............................................            4%
</TABLE>
 
- ---------------------
 
 *   The date shares were first issued. Shareholders who held shares of the Fund
     prior to July 28, 1997 (the date the Fund converted to a multiple class
     share structure) should refer to the Financial Highlights of Class B to
     obtain the historical per share data and ratio information of their shares.
 +   Calculated based on the net asset value as of the last business day of the
     period.
(1)  Not annualized.
(2)  Annualized.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                       48
<PAGE>

                     DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST

                             PART C  OTHER INFORMATION

Item 24.  Financial Statements and Exhibits

     (a)  FINANCIAL STATEMENTS

          (1)  Financial statements and schedules, included in Prospectus
               (Part A):
                                                                      Page in
                                                                      Prospectus
                                                                      ----------
               Financial highlights for the years ended December 31,
               1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
               and 1997 (Class B). . . . . . . . . . . . . . . . . . . .   6

               Financial Highlights for the period July 28, 1997 through
               December 31, 1997 (Class A, C and D). . . . . . . . . . .   7

          (2)  Financial statements included in the Statement of
               Additional Information (Part B):                       Page in
                                                                      SAI
                                                                      ---
               Portfolio of Investments at December 31, 1997 . . . . .  35

               Statement of Assets and Liabilities at
               December 31,1997. . . . . . . . . . . . . . . . . . . .  37

               Statement of Operations for the year ended
               December 31, 1997 . . . . . . . . . . . . . . . . . . .  38

               Statement of Changes in Net Assets for the years
               ended December 31, 1996 and December 31, 1997 . . . . .  39

               Notes to Financial Statements . . . . . . . . . . . . .  40

               Financial Highlights for the years ended December 31,
               1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
               and 1997 (Class B). . . . . . . . . . . . . . . . . . .  46

               Financial Highlights for the period July 28, 1997
               through December 31, 1997 (Class A, C and D). . . . . .  47

          (3)  Financial statements included in Part C:

               None

        (b)    EXHIBITS:

               2.  -   Amended and Restated By-Laws of the Registrant dated as
                       of October 23, 1997

               8.  -   Form of Transfer Agency Agreement between the
                       Registrant and Morgan Stanley Dean Witter Trust FSB

               11. -   Consent of Independent Accountants

               16. -   Schedules for Computation of Performance Quotations

<PAGE>

               27. -   Financial Data Schedules

            Other. -   Power of Attorney

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

Item 25.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT.

          None

Item 26.  NUMBER OF HOLDERS OF SECURITIES.

<TABLE>
<CAPTION>
          (1)                                           (2)
                                              Number of Record Holders
     Title of Class                             at February 28, 1998
     --------------                           ------------------------

     <S>                                      <C>
     Class A                                             2,393
     Class B                                           231,223
     Class C                                               266
     Class D                                               128
</TABLE>

Item 27.  INDEMNIFICATION.

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

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

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

<PAGE>


been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act, and will be governed by the final adjudication
of such issue.

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

     Registrant, in conjunction with the Investment Manager, Registrant's
Trustees, and other registered investment management companies managed by the
Investment Manager, maintains insurance on behalf of any person who is or was a
Trustee, officer, employee, or agent of Registrant, or who is or was serving at
the request of Registrant as a trustee, director, officer, employee or agent of
another trust or corporation, against any liability asserted against him and
incurred by him or arising out of his position.  However, in no event will
Registrant maintain insurance to indemnify any such person for any act for which
Registrant itself is not permitted to indemnify him.

Item 28.  BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER.

     See "The Fund and Its Management" in the Prospectus regarding the business
of the investment adviser.  The following information is given regarding
officers of Dean Witter InterCapital Inc.  InterCapital is a wholly-owned
subsidiary of Morgan Stanley Dean Witter & Co.  The principal address of the
Dean Witter Funds is Two World Trade Center, New York, New York 10048.

     The term "Dean Witter Funds" used below refers to the following registered
investment companies:

CLOSED-END INVESTMENT COMPANIES
(1)    Dean Witter Government Income Trust
(2)    High Income Advantage Trust
(3)    High Income Advantage Trust II
(4)    High Income Advantage Trust III
(5)    InterCapital California Insured Municipal Income Trust
(6)    InterCapital California Quality Municipal Securities
(7)    InterCapital Income Securities Inc.
(8)    InterCapital Insured California Municipal Securities
(9)    InterCapital Insured Municipal Bond Trust
(10)   InterCapital Insured Municipal Income Trust
(11)   InterCapital Insured Municipal Securities
(12)   InterCapital Insured Municipal Trust
(13)   InterCapital New York Quality Municipal Securities
(14)   InterCapital Quality Municipal Income Trust
(15)   InterCapital Quality Municipal Investment Trust
(16)   InterCapital Quality Municipal Securities
(17)   Municipal Income Opportunities Trust
(18)   Municipal Income Opportunities Trust II
(19)   Municipal Income Opportunities Trust III
(20)   Municipal Income Trust
(21)   Municipal Income Trust II
(22)   Municipal Income Trust III
(23)   Municipal Premium Income Trust
(24)   Prime Income Trust

<PAGE>

OPEN-END INVESTMENT COMPANIES:
(1)    Active Assets California Tax-Free Trust
(2)    Active Assets Government Securities Trust
(3)    Active Assets Money Trust
(4)    Active Assets Tax-Free Trust
(5)    Dean Witter American Value Fund
(6)    Dean Witter Balanced Growth Fund
(7)    Dean Witter Balanced Income Fund
(8)    Dean Witter California Tax-Free Daily Income Trust
(9)    Dean Witter California Tax-Free Income Fund
(10)   Dean Witter Capital Appreciation Fund
(11)   Dean Witter Capital Growth Securities
(12)   Dean Witter Convertible Securities Trust
(13)   Dean Witter Developing Growth Securities Trust
(14)   Dean Witter Diversified Income Trust
(15)   Dean Witter Dividend Growth Securities Inc.
(16)   Dean Witter European Growth Fund Inc.
(17)   Dean Witter Federal Securities Trust
(18)   Dean Witter Financial Services Trust
(19)   Dean Witter Fund of Funds
(20)   Dean Witter Global Asset Allocation Fund
(21)   Dean Witter Global Dividend Growth Securities
(22)   Dean Witter Global Short-Term Income Fund Inc.
(23)   Dean Witter Global Utilities Fund
(24)   Dean Witter Hawaii Municipal Trust
(25)   Dean Witter Health Sciences Trust
(26)   Dean Witter High Yield Securities Inc.
(27)   Dean Witter Income Builder Fund
(28)   Dean Witter Information Fund
(29)   Dean Witter Intermediate Income Securities
(30)   Dean Witter Intermediate Term U.S. Treasury Trust
(31)   Dean Witter International SmallCap Fund
(32)   Dean Witter Japan Fund
(33)   Dean Witter Limited Term Municipal Trust
(34)   Dean Witter Liquid Asset Fund Inc.
(35)   Dean Witter Market Leader Trust
(36)   Dean Witter Mid-Cap Growth Fund
(37)   Dean Witter Multi-State Municipal Series Trust
(38)   Dean Witter Natural Resource Development Securities Inc.
(39)   Dean Witter New York Municipal Money Market Trust
(40)   Dean Witter New York Tax-Free Income Fund
(41)   Dean Witter Pacific Growth Fund Inc.
(42)   Dean Witter Precious Metals and Minerals Trust
(43)   Dean Witter Retirement Series
(44)   Dean Witter S&P 500 Index Fund
(45)   Dean Witter Select Dimensions Investment Series
(46)   Dean Witter Select Municipal Reinvestment Fund
(47)   Dean Witter Short-Term Bond Fund
(48)   Dean Witter Short-Term U.S. Treasury Trust
(49)   Dean Witter Special Value Fund
(50)   Dean Witter Strategist Fund

<PAGE>

(51)   Dean Witter Tax-Exempt Securities Trust
(52)   Dean Witter Tax-Free Daily Income Trust
(53)   Dean Witter U.S. Government Money Market Trust
(54)   Dean Witter U.S. Government Securities Trust
(55)   Dean Witter Utilities Fund
(56)   Dean Witter Value-Added Market Series
(57)   Dean Witter Variable Investment Series
(58)   Dean Witter World Wide Income Trust
(59)   Dean Witter World Wide Investment Trust
(60)   Morgan Stanley Dean Witter Competitive Edge Fund
(61)   Morgan Stanley Dean Witter Growth Fund
(62)   Morgan Stanley Dean Witter Mid-Cap Dividend Growth Securities

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

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

CLOSED-END INVESTMENT COMPANIES
(1)    TCW/DW Term Trust 2000
(2)    TCW/DW Term Trust 2002
(3)    TCW/DW Term Trust 2003

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             --------------------------------------------------
Charles A. Fiumefreddo        Executive Vice President and Director of Dean
Chairman, Chief Executive     Witter Reynolds Inc. ("DWR"); Chairman, Chief
Officer and Director          Executive Officer and Director of Dean Witter
                              Distributors Inc. ("Distributors") and Dean Witter
                              Services Company Inc. ("DWSC"); Chairman and
                              Director of Morgan Stanley Dean Witter Trust FSB
                              ("MSDW Trust"); Chairman, Director or Trustee,
                              President and Chief Executive Officer of the Dean
                              Witter Funds and Chairman, Chief Executive Officer
                              and Trustee of the TCW/DW Funds; Director and/or
                              officer of various Morgan Stanley Dean Witter &
                              Co. ("MSDW") subsidiaries.

Philip J. Purcell             Chairman, Chief Executive Officer and Director of
Director                      MSDW and DWR; Director of DWSC and Distributors;
                              Director or Trustee of the Dean Witter Funds;
                              Director and/or officer of various MSDW 
                              subsidiaries.

Richard M. DeMartini          President and Chief Operating Officer of Dean
Director                      Witter Capital, a division of DWR; Director of
                              DWR, DWSC, Distributors and MSDW Trust; Trustee of
                              the TCW/DW Funds.

<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             --------------------------------------------------
James F. Higgins              President and Chief Operating Officer of Dean
Director                      Witter Financial; Director of DWR, DWSC,
                              Distributors and MSDW Trust.

Thomas C. Schneider           Executive Vice President and Chief Strategic and
Executive Vice President,     Administrative Officer of MSDW; Executive
Chief Financial Officer       Vice President and Chief Financial
and Director                  Officer of DWSC and Distributors; Director of DWR,
                              DWSC, Distributors and MSDW.

Christine A. Edwards          Executive Vice President, Chief Legal Officer
Director                      and Secretary of MSDW; Executive Vice President,
                              Secretary and Chief Legal Officer of Distributors;
                              Director of DWR, DWSC and Distributors.

Mitchell M. Merin             President and Chief Strategic Officer of DWSC,
President and Chief           Executive Vice President of Distributors;
Strategic Officer             Executive Vice President and Director of MSDW
                              Trust; Executive Vice President and Director of
                              DWR; Director of SPS Transaction Services,
                              Inc. and various other MSDW subsidiaries.

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

John B. Van Heuvelen          President, Chief Operating Officer and Director
Executive Vice                of MSDW Trust.
President

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

Edward C. Oelsner III
Executive Vice President

Barry Fink                    Assistant Secretary of DWR; Senior Vice President,
Senior Vice President,        Secretary and General Counsel of DWSC; Senior Vice
Secretary and General         President, Assistant Secretary and Assistant
Counsel                       General Counsel of Distributors; Vice President,
                              Secretary and General Counsel of the Dean Witter
                              Funds and the TCW/DW Funds.

Peter M. Avelar               Vice President of various Dean Witter Funds.
Senior Vice President

<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             --------------------------------------------------
Mark Bavoso                   Vice President of various Dean Witter Funds.
Senior Vice President

Richard Felegy
Senior Vice President

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

Robert S. Giambrone           Senior Vice President of DWSC, Distributors
Senior Vice President         and MSDW Trust and Director of MSDW Trust; Vice
                              President of the Dean Witter Funds and the TCW/DW
                              Funds.

Rajesh K. Gupta               Vice President of various Dean Witter Funds.
Senior Vice President

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

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

Margaret Iannuzzi
Senior Vice President

Jenny Beth Jones              Vice President of Dean Witter Special Value Fund.
Senior Vice President

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

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

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

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

Guy G. Rutherfurd, Jr.        Vice President of Dean Witter Market Leader
Senior Vice President         Trust.

<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             --------------------------------------------------
Rochelle G. Siegel            Vice President of various Dean Witter Funds.
Senior Vice President

Jayne M. Stevlingson          Vice President of various Dean Witter Funds.
Senior Vice President

Paul D. Vance                 Vice President of various Dean Witter Funds.
Senior Vice President

Elizabeth A. Vetell
Senior Vice President

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

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

Douglas Brown
First Vice President

Thomas F. Caloia              First Vice President and Assistant Treasurer of
First Vice President          DWSC, Assistant Treasurer of Distributors;
and Assistant                 Treasurer and Chief Financial Officer of the
Treasurer                     Dean Witter Funds and the TCW/DW Funds.

Thomas Chronert
First Vice President

Rosalie Clough
First Vice President

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

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

David Johnson
First Vice President

Stanley Kapica
First Vice President

<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             --------------------------------------------------
Robert Zimmerman
First Vice President

Dale Albright
Vice President

Joan G. Allman
Vice President

Andrew Arbenz
Vice President

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

Nancy Belza
Vice President

Maurice Bendrihem
Vice President and
Assistant Controller

Joseph Cardwell
Vice President

Philip Casparius
Vice President

B. Catherine Connelly
Vice President

Salvatore DeSteno             Vice President of DWSC.
Vice President

Bruce Dunn
Vice President

Michael Durbin
Vice President

Jeffrey D. Geffen
Vice President

Michael Geringer
Vice President

<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             --------------------------------------------------
Stephen Greenhut
Vice President

Peter W. Gurman
Vice President

Matthew Haynes                Vice President of Dean Witter Variable Investment
Vice President                Series.


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

Elizabeth Hinchman
Vice President

David Hoffman
Vice President

Christopher Jones
Vice President

Kevin Jung
Vice President

James P. Kastberg
Vice President

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

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

Thomas Lawlor
Vice President

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

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

Albert McGarity
Vice President

LouAnne D. McInnis            Vice President and Assistant Secretary of DWSC;
Vice President and            Assistant Secretary of the Dean Witter Funds and
Assistant Secretary           the TCW/DW Funds.

<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             --------------------------------------------------
Sharon K. Milligan
Vice President

Julie Morrone
Vice President

Mary Beth Mueller
Vice President

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

Richard Norris
Vice President

Carsten Otto                  Vice President and Assistant Secretary of DWSC;
Vice President and            Assistant Secretary of the Dean Witter Funds and
Assistant Secretary           the TCW/DW Funds.

George Paoletti
Vice President

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

Michael Roan
Vice President

John Roscoe
Vice President

Hugh Rose
Vice President

Robert Rossetti               Vice President of Dean Witter Precious Metals and
Vice President                Minerals Trust.

Ruth Rossi                    Vice President and Assistant Secretary of DWSC;
Vice President and            Assistant Secretary of the Dean Witter Funds and
Assistant Secretary           the TCW/DW Funds.

Carl F. Sadler
Vice President

Deborah Santaniello
Vice President

<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             --------------------------------------------------
Peter J. Seeley               Vice President of various Dean Witter Funds.
Vice President

Naomi Stein
Vice President

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

Marybeth Swisher
Vice President

Robert Vanden Assem
Vice President

James P. Wallin
Vice President

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

Item 29.  PRINCIPAL UNDERWRITERS

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

(1)    Active Assets California Tax-Free Trust
(2)    Active Assets Government Securities Trust
(3)    Active Assets Money Trust
(4)    Active Assets Tax-Free Trust
(5)    Dean Witter American Value Fund
(6)    Dean Witter Balanced Growth Fund
(7)    Dean Witter Balanced Income Fund
(8)    Dean Witter California Tax-Free Daily Income Trust
(9)    Dean Witter California Tax-Free Income Fund
(10)   Dean Witter Capital Appreciation Fund
(11)   Dean Witter Capital Growth Securities
(12)   Dean Witter Convertible Securities Trust
(13)   Dean Witter Developing Growth Securities Trust
(14)   Dean Witter Diversified Income Trust
(15)   Dean Witter Dividend Growth Securities Inc.
(16)   Dean Witter European Growth Fund Inc.
(17)   Dean Witter Federal Securities Trust
(18)   Dean Witter Financial Services Trust
(19)   Dean Witter Fund of Funds
(20)   Dean Witter Global Asset Allocation
(21)   Dean Witter Global Dividend Growth Securities
(22)   Dean Witter Global Short-Term Income Fund Inc.

<PAGE>

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

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

<PAGE>

Name                     Positions and Office with Distributors
- ----                     --------------------------------------
Fredrick K. Kubler       Senior Vice President, Assistant
                         Secretary and Chief Compliance
                         Officer.

Michael T. Gregg         Vice President and Assistant
                         Secretary.

Item 30.  LOCATION OF ACCOUNTS AND RECORDS

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

Item 31.  MANAGEMENT SERVICES

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

Item 32.  UNDERTAKINGS

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

                                      SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all of
the requirements for effectiveness of this Registration Statement pursuant to
Rule 485(b) under the Securities Act of 1933 and has duly caused this Post-
Effective Amendment to the Registration Statement to be signed on its behalf by
the undersigned, thereunto duly authorized, in the City of New York and State of
New York on the 17th day of April, 1998.

                                   DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST

                                        By        /s/  Barry Fink
                                             -----------------------------------
                                                       Barry Fink
                                             Vice President and Secretary

     Pursuant to the requirements of the Securities Act of 1933, this Post-
Effective Amendment No. 16 has been signed below by the following persons in the
capacities and on the dates indicated.


<TABLE>
<CAPTION>

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

<S>                                          <C>                                <C>
(1)  Principal Executive Officer             President, Chief
                                             Executive Officer,
                                             Trustee and Chairman

By   /s/  Charles A. Fiumefreddo                                                4/17/98
     ------------------------------
          Charles A. Fiumefreddo

(2)  Principal Financial Officer             Treasurer and Principal
                                             Accounting Officer

By   /s/  Thomas F. Caloia                                                      4/17/98
     ------------------------------
          Thomas F. Caloia

(3)  Majority of the Trustees

     Charles A. Fiumefreddo (Chairman)
     Philip J. Purcell

By   /s/  Barry Fink                                                            4/17/98
     ------------------------------
          Barry Fink
          Attorney-in-Fact

     Michael Bozic       Manuel H. Johnson
     Edwin J. Garn       Michael E. Nugent
     John R. Haire       John L. Schroeder
     Wayne E. Hedien



By   /s/  David M. Butowsky                                                     4/17/98
     ------------------------------
          David M. Butowsky
          Attorney-in-Fact
</TABLE>
<PAGE>



                     DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST

                                    EXHIBIT INDEX

2.      Amended and Restated By-Laws of the Registrant dated October 23, 1997.

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

11.     Consent of Independent Accountants.

16.     Schedules for Computation of Performance Quotations.

27.     Financial Data Schedules.

Other.  Power of Attorney.


<PAGE>
                                   BY-LAWS 

                                      OF 

                 DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST 
                 AMENDED AND RESTATED AS OF OCTOBER 23, 1997 

                                  ARTICLE I 

                                 DEFINITIONS 

   The terms "COMMISSION," "DECLARATION," "DISTRIBUTOR," "INVESTMENT 
ADVISER," "MAJORITY SHAREHOLDER VOTE," "1940 ACT," "SHAREHOLDER," "SHARES," 
"TRANSFER AGENT," "TRUST," "TRUST PROPERTY," and "TRUSTEES" have the 
respective meanings given them in the Declaration of Trust of Dean Witter 
U.S. Government Securities Trust dated September 29, 1983, as amended from 
time to time. 

                                  ARTICLE II 

                                   OFFICES 

   SECTION 2.1. PRINCIPAL OFFICE. Until changed by the Trustees, the 
principal office of the Trust in the Commonwealth of Massachusetts shall be 
in the City of Boston, County of Suffolk. 

   SECTION 2.2. OTHER OFFICES. In addition to its principal office in the 
Commonwealth of Massachusetts, the Trust may have an office or offices in the 
City of New York, State of New York, and at such other places within and 
without the Commonwealth as the Trustees may from time to time designate or 
the business of the Trust may require. 

                                 ARTICLE III 

                            SHAREHOLDERS' MEETINGS 

   SECTION 3.1. PLACE OF MEETINGS. Meetings of Shareholders shall be held at 
such place, within or without the Commonwealth of Massachusetts, as may be 
designated from time to time by the Trustees. 

   SECTION 3.2. MEETINGS. Meetings of Shareholders of the Trust shall be held 
whenever called by the Trustees or the President of the Trust and whenever 
election of a Trustee or Trustees by Shareholders is required by the 
provisions of Section 16(a) of the 1940 Act, for that purpose. Meetings of 
Shareholders shall also be called by the Secretary upon the written request 
of the holders of Shares entitled to vote not less than twenty-five percent 
(25%) of all the votes entitled to be cast at such meeting. Such request 
shall state the purpose or purposes of such meeting and the matters proposed 
to be acted on thereat. The Secretary shall inform such Shareholders of the 
reasonable estimated cost of preparing and mailing such notice of the 
meeting, and upon payment to the Trust of such costs, the Secretary shall 
give notice stating the purpose or purposes of the meeting to all entitled to 
vote at such meeting. No meeting need be called upon the request of the 
holders of Shares entitled to cast less than a majority of all votes entitled 
to be cast at such meeting, to consider any matter which is substantially the 
same as a matter voted upon at any meeting of Shareholders held during the 
preceding twelve months. 

   SECTION 3.3. NOTICE OF MEETINGS. Written or printed notice of every 
Shareholders' meeting stating the place, date, and purpose or purposes 
thereof, shall be given by the Secretary not less than ten (10) nor more than 
ninety (90) days before such meeting to each Shareholder entitled to vote at 
such meeting. Such notice shall be deemed to be given when deposited in the 
United States mail, postage prepaid, directed to the Shareholder at his 
address as it appears on the records of the Trust. 

   SECTION 3.4. QUORUM AND ADJOURNMENT OF MEETINGS. Except as otherwise 
provided by law, by the Declaration or by these By-Laws, at all meetings of 
Shareholders, the holders of a majority of the Shares issued and outstanding 
and entitled to vote thereat, present in person or represented by proxy, 
shall be requisite and shall constitute a quorum for the transaction of 
business. In the absence of a quorum, the 

                                1           
<PAGE>
Shareholders present or represented by proxy and entitled to vote thereat 
shall have the power to adjourn the meeting from time to time. The 
Shareholders present in person or represented by proxy at any meeting and 
entitled to vote thereat also shall have the power to adjourn the meeting 
from time to time if the vote required to approve or reject any proposal 
described in the original notice of such meeting is not obtained (with 
proxies being voted for or against adjournment consistent with the votes for 
and against the proposal for which the required vote has not been obtained). 
The affirmative vote of the holders of a majority of the Shares then present 
in person or represented by proxy shall be required to adjourn any meeting. 
Any adjourned meeting may be reconvened without further notice or change in 
record date. At any reconvened meeting at which a quorum shall be present, 
any business may be transacted that might have been transacted at the meeting 
as originally called. 

   SECTION 3.5. VOTING RIGHTS, PROXIES. At each meeting of Shareholders, each 
holder of record of Shares entitled to vote thereat shall be entitled to one 
vote in person or by proxy, executed in writing by the Shareholder or his 
duly authorized attorney-in-fact, for each Share of beneficial interest of 
the Trust and for the fractional portion of one vote for each fractional 
Share entitled to vote so registered in his name on the records of the Trust 
on the date fixed as the record date for the determination of Shareholders 
entitled to vote at such meeting. No proxy shall be valid after eleven months 
from its date, unless otherwise provided in the proxy. At all meetings of 
Shareholders, unless the voting is conducted by inspectors, all questions 
relating to the qualification of voters and the validity of proxies and the 
acceptance or rejection of votes shall be decided by the chairman of the 
meeting. Pursuant to a resolution of a majority of the Trustees, proxies may 
be solicited in the name of one or more Trustees or Officers of the Trust. 

   SECTION 3.6. VOTE REQUIRED. Except as otherwise provided by law, by the 
Declaration of Trust, or by these By-Laws, at each meeting of Shareholders at 
which a quorum is present, all matters shall be decided by Majority 
Shareholder Vote. 

   SECTION 3.7. INSPECTORS OF ELECTION. In advance of any meeting of 
Shareholders, the Trustees may appoint Inspectors of Election to act at the 
meeting or any adjournment thereof. If Inspectors of Election are not so 
appointed, the chairman of any meeting of Shareholders may, and on the 
request of any Shareholder or his proxy shall, appoint Inspectors of Election 
of the meeting. In case any person appointed as Inspector fails to appear or 
fails or refuses to act, the vacancy may be filled by appointment made by the 
Trustees in advance of the convening of the meeting or at the meeting by the 
person acting as chairman. The Inspectors of Election shall determine the 
number of Shares outstanding, the Shares represented at the meeting, the 
existence of a quorum, the authenticity, validity and effect of proxies, 
shall receive votes, ballots or consents, shall hear and determine all 
challenges and questions in any way arising in connection with the right to 
vote, shall count and tabulate all votes or consents, determine the results, 
and do such other acts as may be proper to conduct the election or vote with 
fairness to all Shareholders. On request of the chairman of the meeting, or 
of any Shareholder or his proxy, the Inspectors of Election shall make a 
report in writing of any challenge or question or matter determined by them 
and shall execute a certificate of any facts found by them. 

   SECTION 3.8. INSPECTION OF BOOKS AND RECORDS. Shareholders shall have such 
rights and procedures of inspection of the books and records of the Trust as 
are granted to Shareholders under the Corporations and Associations Law of 
the State of Maryland. 

   SECTION 3.9. ACTION BY SHAREHOLDERS WITHOUT MEETING. Except as otherwise 
provided by law, the provisions of these By-Laws relating to notices and 
meetings to the contrary notwithstanding, any action required or permitted to 
be taken at any meeting of Shareholders may be taken without a meeting if a 
majority of the Shareholders entitled to vote upon the action consent to the 
action in writing and such consents are filed with the records of the Trust. 
Such consent shall be treated for all purposes as a vote taken at a meeting 
of Shareholders. 

   SECTION 3.10. PRESENCE AT MEETINGS. Presence at meetings of shareholders 
requires physical attendance by the shareholder or his or her proxy at the 
meeting site and does not encompass attendance by telephonic or other 
electronic means. 

                                2           
<PAGE>
                                  ARTICLE IV 

                                   TRUSTEES 

   SECTION 4.1. MEETINGS OF THE TRUSTEES. The Trustees may in their 
discretion provide for regular or special meetings of the Trustees. Regular 
meetings of the Trustees may be held at such time and place as shall be 
determined from time to time by the Trustees without further notice. Special 
meetings of the Trustees may be called at any time by the President and shall 
be called by the President or the Secretary upon the written request of any 
two (2) Trustees. 

   SECTION 4.2. NOTICE OF SPECIAL MEETINGS. Written notice of special 
meetings of the Trustees, stating the place, date and time thereof, shall be 
given not less than two (2) days before such meeting to each Trustee, 
personally, by telegram, by mail, or by leaving such notice at his place of 
residence or usual place of business. If mailed, such notice shall be deemed 
to be given when deposited in the United States mail, postage prepaid, 
directed to the Trustee at his address as it appears on the records of the 
Trust. Subject to the provisions of the 1940 Act, notice or waiver of notice 
need not specify the purpose of any special meeting. 

   SECTION 4.3. TELEPHONE MEETINGS. Subject to the provisions of the 1940 
Act, any Trustee, or any member or members of any committee designated by the 
Trustees, may participate in a meeting of the Trustees, or any such 
committee, as the case may be, by means of a conference telephone or similar 
communications equipment if all persons participating in the meeting can hear 
each other at the same time. Participation in a meeting by these means 
constitutes presence in person at the meeting. 

   SECTION 4.4. QUORUM, VOTING AND ADJOURNMENT OF MEETINGS. At all meetings 
of the Trustees, a majority of the Trustees shall be requisite to and shall 
constitute a quorum for the transaction of business. If a quorum is present, 
the affirmative vote of a majority of the Trustees present shall be the act 
of the Trustees, unless the concurrence of a greater proportion is expressly 
required for such action by law, the Declaration or these By-Laws. If at any 
meeting of the Trustees there be less than a quorum present, the Trustees 
present thereat may adjourn the meeting from time to time, without notice 
other than announcement at the meeting, until a quorum shall have been 
obtained. 

   SECTION 4.5. ACTION BY TRUSTEES WITHOUT MEETING. The provisions of these 
By-Laws covering notices and meetings to the contrary notwithstanding, and 
except as required by law, any action required or permitted to be taken at 
any meeting of the Trustees may be taken without a meeting if a consent in 
writing setting forth the action shall be signed by all of the Trustees 
entitled to vote upon the action and such written consent is filed with the 
minutes of proceedings of the Trustees. 

   SECTION 4.6. EXPENSES AND FEES. Each Trustee may be allowed expenses, if 
any, for attendance at each regular or special meeting of the Trustees, and 
each Trustee who is not an officer or employee of the Trust or of its 
investment manager or underwriter or of any corporate affiliate of any of 
said persons shall receive for services rendered as a Trustee of the Trust 
such compensation as may be fixed by the Trustees. Nothing herein contained 
shall be construed to preclude any Trustee from serving the Trust in any 
other capacity and receiving compensation therefor. 

   SECTION 4.7. EXECUTION OF INSTRUMENTS AND DOCUMENTS AND SIGNING OF CHECKS 
AND OTHER OBLIGATIONS AND TRANSFERS. All instruments, documents and other 
papers shall be executed in the name and on behalf of the Trust and all 
checks, notes, drafts and other obligations for the payment of money by the 
Trust shall be signed, and all transfer of securities standing in the name of 
the Trust shall be executed, by the Chairman, the President, any Vice 
President or the Treasurer or by any one or more officers or agents of the 
Trust as shall be designated for that purpose by vote of the Trustees; 
notwithstanding the above, nothing in this Section 4.7 shall be deemed to 
preclude the electronic authorization, by designated persons, of the Trust's 
Custodian (as described herein in Section 9.1) to transfer assets of the 
Trust, as provided for herein in Section 9.1. 

   SECTION 4.8. INDEMNIFICATION OF TRUSTEES, OFFICERS, EMPLOYEES AND 
AGENTS. (a) The Trust shall indemnify any person who was or is a party or is 
threatened to be made a party to any threatened, pending, or completed 
action, suit or proceeding, whether civil, criminal, administrative or 
investigative 

                                3           
<PAGE>
(other than an action by or in the right of the Trust) by reason of the fact 
that he is or was a Trustee, officer, employee, or agent of the Trust. The 
indemnification shall be against expenses, including attorneys' fees, 
judgments, fines, and amounts paid in settlement, actually and reasonably 
incurred by him in connection with the action, suit, or proceeding, if he 
acted in good faith and in a manner he reasonably believed to be in or not 
opposed to the best interests of the Trust, and, with respect to any criminal 
action or proceeding, had no reasonable cause to believe his conduct was 
unlawful. The termination of any action, suit or proceeding by judgment, 
order, settlement, conviction, or upon a plea of nolo contendere or its 
equivalent, shall not, of itself, create a presumption that the person did 
not act in good faith and in a manner which he reasonably believed to be in 
or not opposed to the best interests of the Trust, and, with respect to any 
criminal action or proceeding, had reasonable cause to believe that his 
conduct was unlawful. 

   (b) The Trust shall indemnify any person who was or is a party or is 
threatened to be made a party to any threatened, pending or completed action 
or suit by or on behalf of the Trust to obtain a judgment or decree in its 
favor by reason of the fact that he is or was a Trustee, officer, employee, 
or agent of the Trust. The indemnification shall be against expenses, 
including attorneys' fees actually and reasonably incurred by him in 
connection with the defense or settlement of the action or suit, if he acted 
in good faith and in a manner he reasonably believed to be in or not opposed 
to the best interests of the Trust; except that no indemnification shall be 
made in respect of any claim, issue, or matter as to which the person has 
been adjudged to be liable for negligence or misconduct in the performance of 
his duty to the Trust, except to the extent that the court in which the 
action or suit was brought, or a court of equity in the county in which the 
Trust has its principal office, determines upon application that, despite the 
adjudication of liability but in view of all circumstances of the case, the 
person is fairly and reasonably entitled to indemnity for those expenses 
which the court shall deem proper, provided such Trustee, officer, employee 
or agent is not adjudged to be liable by reason of his willful misfeasance, 
bad faith, gross negligence or reckless disregard of the duties involved in 
the conduct of his office. 

   (c) To the extent that a Trustee, officer, employee, or agent of the Trust 
has been successful on the merits or otherwise in defense of any action, suit 
or proceeding referred to in subsection (a) or (b) or in defense of any 
claim, issue or matter therein, he shall be indemnified against expenses, 
including attorneys' fees, actually and reasonably incurred by him in 
connection therewith. 

   (d) (1) Unless a court orders otherwise, any indemnification under 
subsections (a) or (b) of this section may be made by the Trust only as 
authorized in the specific case after a determination that indemnification of 
the Trustee, officer, employee, or agent is proper in the circumstances 
because he has met the applicable standard of conduct set forth in 
subsections (a) or (b). 

       (2) The determination shall be made: 

           (i) By the Trustees, by a majority vote of a quorum which consists of
    Trustees who were not parties to the action, suit or proceeding; or 

          (ii) If the required quorum is not obtainable, or if a quorum of 
    disinterested Trustees so directs, by independent legal counsel in a 
    written opinion; or 

         (iii) By the Shareholders. 

       (3) Notwithstanding any provision of this Section 4.8, no person shall 
    be entitled to indemnification for any liability, whether or not there is 
    an adjudication of liability, arising by reason of willful misfeasance, 
    bad faith, gross negligence, or reckless disregard of duties as described 
    in Section 17(h) and (i) of the Investment Company Act of 1940 
    ("disabling conduct"). A person shall be deemed not liable by reason of 
    disabling conduct if, either: 

           (i) a final decision on the merits is made by a court or other body
    before whom the proceeding was brought that the person to be indemnified 
    ("indemnitee") was not liable by reason of disabling conduct; or 

          (ii) in the absence of such a decision, a reasonable determination,
    based upon a review of the facts, that the indemnitee was not liable by 
    reason of disabling conduct, is made by either-- 

                                4           
<PAGE>
          (A) a majority of a quorum of Trustees who are neither "interested 
         persons" of the Trust, as defined in Section 2(a)(19) of the 
         Investment Company Act of 1940, nor parties to the action, suit or 
         proceeding, or 

          (B) an independent legal counsel in a written opinion. 

   (e) Expenses, including attorneys' fees, incurred by a Trustee, officer, 
employee or agent of the Trust in defending a civil or criminal action, suit 
or proceeding may be paid by the Trust in advance of the final disposition 
thereof if: 

        (1) authorized in the specific case by the Trustees; and 

        (2) the Trust receives an undertaking by or on behalf of the Trustee, 
    officer, employee or agent of the Trust to repay the advance if it is not 
    ultimately determined that such person is entitled to be indemnified by 
    the Trust; and 

        (3) either, (i) such person provides a security for his undertaking, 
    or 

           (ii) the Trust is insured against losses by reason of any lawful 
         advances, or 

          (iii) a determination, based on a review of readily available 
         facts, that there is reason to believe that such person ultimately 
         will be found entitled to indemnification, is made by either-- 

              (A) a majority of a quorum which consists of Trustees who are 
             neither "interested persons" of the Trust, as defined in Section 
             2(a)(19) of the 1940 Act, nor parties to the action, suit or 
             proceeding, or 

              (B) an independent legal counsel in a written opinion. 

   (f) The indemnification provided by this Section shall not be deemed 
exclusive of any other rights to which a person may be entitled under any 
by-law, agreement, vote of Shareholders or disinterested Trustees or 
otherwise, both as to action in his official capacity and as to action in 
another capacity while holding the office, and shall continue as to a person 
who has ceased to be a Trustee, officer, employee, or agent and inure to the 
benefit of the heirs, executors and administrators of such person; provided 
that no person may satisfy any right of indemnity or reimbursement granted 
herein or to which he may be otherwise entitled except out of the property of 
the Trust, and no Shareholder shall be personally liable with respect to any 
claim for indemnity or reimbursement or otherwise. 

   (g) The Trust may purchase and maintain insurance on behalf of any person 
who is or was a Trustee, officer, employee, or agent of the Trust, against 
any liability asserted against him and incurred by him in any such capacity, 
or arising out of his status as such. However, in no event will the Trust 
purchase insurance to indemnify any officer or Trustee against liability for 
any act for which the Trust itself is not permitted to indemnify him. 

   (h) Nothing contained in this Section shall be construed to protect any 
Trustee or officer of the Trust against any liability to the Trust or to its 
security holders to which he would otherwise be subject by reason of willful 
misfeasance, bad faith, gross negligence or reckless disregard of the duties 
involved in the conduct of his office. 

                                  ARTICLE V 

                                  COMMITTEES 

   SECTION 5.1. EXECUTIVE AND OTHER COMMITTEES. The Trustees, by resolution 
adopted by a majority of the Trustees, may designate an Executive Committee 
and/or committees, each committee to consist of two (2) or more of the 
Trustees of the Trust and may delegate to such committees, in the intervals 
between meetings of the Trustees, any or all of the powers of the Trustees in 
the management of the business and affairs of the Trust. In the absence of 
any member of any such committee, the members thereof present at any meeting, 
whether or not they constitute a quorum, may appoint a Trustee to act in 
place of such absent member. Each such committee shall keep a record of its 
proceedings. 

                                5           
<PAGE>
   The Executive Committee and any other committee shall fix its own rules or 
procedure, but the presence of at least fifty percent (50%) of the members of 
the whole committee shall in each case be necessary to constitute a quorum of 
the committee and the affirmative vote of the majority of the members of the 
committee present at the meeting shall be necessary to take action. 

   All actions of the Executive Committee shall be reported to the Trustees 
at the meeting thereof next succeeding to the taking of such action. 

   SECTION 5.2. ADVISORY COMMITTEE. The Trustees may appoint an advisory 
committee which shall be composed of persons who do not serve the Trust in 
any other capacity and which shall have advisory functions with respect to 
the investments of the Trust but which shall have no power to determine that 
any security or other investment shall be purchased, sold or otherwise 
disposed of by the Trust. The number of persons constituting any such 
advisory committee shall be determined from time to time by the Trustees. The 
members of any such advisory committee may receive compensation for their 
services and may be allowed such fees and expenses for the attendance at 
meetings as the Trustees may from time to time determine to be appropriate. 

   SECTION 5.3. COMMITTEE ACTION WITHOUT MEETING. The provisions of these 
By-Laws covering notices and meetings to the contrary notwithstanding, and 
except as required by law, any action required or permitted to be taken at 
any meeting of any Committee of the Trustees appointed pursuant to Section 
5.1 of these By-Laws may be taken without a meeting if a consent in writing 
setting forth the action shall be signed by all members of the Committee 
entitled to vote upon the action and such written consent is filed with the 
records of the proceedings of the Committee. 

                                  ARTICLE VI 
                                   OFFICERS 

   SECTION 6.1. EXECUTIVE OFFICERS. The executive officers of the Trust shall 
be a Chairman, a President, one or more Vice Presidents, a Secretary and a 
Treasurer. The Chairman shall be selected from among the Trustees but none of 
the other executive officers need be a Trustee. Two or more offices, except 
those of President and any Vice President, may be held by the same person, 
but no officer shall execute, acknowledge or verify any instrument in more 
than one capacity. The executive officers of the Trust shall be elected 
annually by the Trustees and each executive officer so elected shall hold 
office until his successor is elected and has qualified. 

   SECTION 6.2. OTHER OFFICERS AND AGENTS. The Trustees may also elect one or 
more Assistant Vice Presidents, Assistant Secretaries and Assistant 
Treasurers and may elect, or may delegate to the President the power to 
appoint, such other officers and agents as the Trustees shall at any time or 
from time to time deem advisable. 

   SECTION 6.3. TERM AND REMOVAL AND VACANCIES. Each officer of the Trust 
shall hold office until his successor is elected and has qualified. Any 
officer or agent of the Trust may be removed by the Trustees whenever, in 
their judgment, the best interests of the Trust will be served thereby, but 
such removal shall be without prejudice to the contractual rights, if any, of 
the person so removed. 

   SECTION 6.4. COMPENSATION OF OFFICERS. The compensation of officers and 
agents of the Trust shall be fixed by the Trustees, or by the President to 
the extent provided by the Trustees with respect to officers appointed by the 
President. 

   SECTION 6.5. POWER AND DUTIES. All officers and agents of the Trust, as 
between themselves and the Trust, shall have such authority and perform such 
duties in the management of the Trust as may be provided in or pursuant to 
these By-Laws, or to the extent not so provided, as may be prescribed by the 
Trustees; provided, that no rights of any third party shall be affected or 
impaired by any such By-Law or resolution of the Trustees unless he has 
knowledge thereof. 

   SECTION 6.6. THE CHAIRMAN. The Chairman shall preside at all meetings of 
the Shareholders and of the Trustees, shall be a signatory on all Annual and 
Semi-Annual Reports as may be sent to shareholders, and he shall perform such 
other duties as the Trustees may from time to time prescribe. 

                                6           
<PAGE>
   SECTION 6.7. THE PRESIDENT. (a) The President shall be the chief executive 
officer of the Trust; he shall have general and active management of the 
business of the Trust, shall see that all orders and resolutions of the Board 
of Trustees are carried into effect, and, in connection therewith, shall be 
authorized to delegate to one or more Vice Presidents such of his powers and 
duties at such times and in such manner as he may deem advisable. 

   (b) In the absence of the Chairman, the President shall preside at all 
meetings of the shareholders and the Board of Trustees; and he shall perform 
such other duties as the Board of Trustees may from time to time prescribe. 

   SECTION 6.8. THE VICE PRESIDENTS. The Vice Presidents shall be of such 
number and shall have such titles as may be determined from time to time by 
the Trustees. The Vice President, or, if there be more than one, the Vice 
Presidents in the order of their seniority as may be determined from time to 
time by the Trustees or the President, shall, in the absence or disability of 
the President, exercise the powers and perform the duties of the President, 
and he or they shall perform such other duties as the Trustees or the 
President may from time to time prescribe. 

   SECTION 6.9. THE ASSISTANT VICE PRESIDENTS. The Assistant Vice President, 
or, if there be more than one, the Assistant Vice Presidents, shall perform 
such duties and have such powers as may be assigned them from time to time by 
the Trustees or the President. 

   SECTION 6.10. THE SECRETARY. The Secretary shall attend all meetings of 
the Trustees and all meetings of the Shareholders and record all the 
proceedings of the meetings of the Shareholders and of the Trustees in a book 
to be kept for that purpose, and shall perform like duties for the standing 
committees when required. He shall give, or cause to be given, notice of all 
meetings of the Shareholders and special meetings of the Trustees, and shall 
perform such other duties and have such powers as the Trustees, or the 
President, may from time to time prescribe. He shall keep in safe custody the 
seal of the Trust and affix or cause the same to be affixed to any instrument 
requiring it, and, when so affixed, it shall be attested by his signature or 
by the signature of an Assistant Secretary. 

   SECTION 6.11. THE ASSISTANT SECRETARIES. The Assistant Secretary, or, if 
there be more than one, the Assistant Secretaries in the order determined by 
the Trustees or the President, shall, in the absence or disability of the 
Secretary, perform the duties and exercise the powers of the Secretary and 
shall perform such duties and have such other powers as the Trustees or the 
President may from time to time prescribe. 

   SECTION 6.12. THE TREASURER. The Treasurer shall be the chief financial 
officer of the Trust. He shall keep or cause to be kept full and accurate 
accounts of receipts and disbursements in books belonging to the Trust, and 
he shall render to the Trustees and the President, whenever any of them 
require it, an account of his transactions as Treasurer and of the financial 
condition of the Trust; and he shall perform such other duties as the 
Trustees, or the President, may from time to time prescribe. 

   SECTION 6.13. THE ASSISTANT TREASURERS. The Assistant Treasurer, or, if 
there shall be more than one, the Assistant Treasurers in the order 
determined by the Trustees or the President, shall, in the absence or 
disability of the Treasurer, perform the duties and exercise the powers of 
the Treasurer and shall perform such other duties and have such other powers 
as the Trustees, or the President, may from time to time prescribe. 

   SECTION 6.14. DELEGATION OF DUTIES. Whenever an officer is absent or 
disabled, or whenever for any reason the Trustees may deem it desirable, the 
Trustees may delegate the powers and duties of an officer or officers to any 
other officer or officers or to any Trustee or Trustees. 

                                 ARTICLE VII 

                         DIVIDENDS AND DISTRIBUTIONS 

   Subject to any applicable provisions of law and the Declaration, dividends 
and distributions upon the Shares may be declared at such intervals as the 
Trustees may determine, in cash, in securities or other property, or in 
Shares, from any sources permitted by law, all as the Trustees shall from 
time to time determine. 

                                7           
<PAGE>
   Inasmuch as the computation of net income and net profits from the sales 
of securities or other properties for federal income tax purposes may vary 
from the computation thereof on the records of the Trust, the Trustees shall 
have power, in their discretion, to distribute as income dividends and as 
capital gain distributions, respectively, amounts sufficient to enable the 
Trust to avoid or reduce liability for federal income taxes. 

                                 ARTICLE VIII 

                            CERTIFICATES OF SHARES 

   SECTION 8.1. CERTIFICATES OF SHARES. Certificates for Shares of each 
series or class of Shares shall be in such form and of such design as the 
Trustees shall approve, subject to the right of the Trustees to change such 
form and design at any time or from time to time, and shall be entered in the 
records of the Trust as they are issued. Each such certificate shall bear a 
distinguishing number; shall exhibit the holder's name and certify the number 
of full Shares owned by such holder; shall be signed by or in the name of the 
Trust by the President, or a Vice President, and countersigned by the 
Secretary or an Assistant Secretary or the Treasurer and an Assistant 
Treasurer of the Trust; shall be sealed with the seal; and shall contain such 
recitals as may be required by law. Where any certificate is signed by a 
Transfer Agent or by a Registrar, the signature of such officers and the seal 
may be facsimile, printed or engraved. The Trust may, at its option, 
determine not to issue a certificate or certificates to evidence Shares owned 
of record by any Shareholder. 

   In case any officer or officers who shall have signed, or whose facsimile 
signature or signatures shall appear on, any such certificate or certificates 
shall cease to be such officer or officers of the Trust, whether because of 
death, resignation or otherwise, before such certificate or certificates 
shall have been delivered by the Trust, such certificate or certificates 
shall, nevertheless, be adopted by the Trust and be issued and delivered as 
though the person or persons who signed such certificate or certificates or 
whose facsimile signature or signatures shall appear therein had not ceased 
to be such officer or officers of the Trust. 

   No certificate shall be issued for any share until such share is fully 
paid. 

   SECTION 8.2. LOST, STOLEN, DESTROYED AND MUTILATED CERTIFICATES. The 
Trustees may direct a new certificate or certificates to be issued in place 
of any certificate or certificates theretofore issued by the Trust alleged to 
have been lost, stolen or destroyed, upon satisfactory proof of such loss, 
theft, or destruction; and the Trustees may, in their discretion, require the 
owner of the lost, stolen or destroyed certificate, or his legal 
representative, to give to the Trust and to such Registrar, Transfer Agent 
and/or Transfer Clerk as may be authorized or required to countersign such 
new certificate or certificates, a bond in such sum and of such type as they 
may direct, and with such surety or sureties, as they may direct, as 
indemnity against any claim that may be against them or any of them on 
account of or in connection with the alleged loss, theft or destruction of 
any such certificate. 

                                  ARTICLE IX 

                                  CUSTODIAN 

   SECTION 9.1. APPOINTMENT AND DUTIES. The Trust shall at times employ a 
bank or trust company having capital, surplus and undivided profits of at 
least five million dollars ($5,000,000) as custodian with authority as its 
agent, but subject to such restrictions, limitations and other requirements, 
if any, as may be contained in these By-Laws and the 1940 Act: 

     (1) to receive and hold the securities owned by the Trust and deliver 
    the same upon written or electronically transmitted order; 

     (2) to receive and receipt for any moneys due to the Trust and deposit 
    the same in its own banking department or elsewhere as the Trustees may 
    direct; 

     (3) to disburse such funds upon orders or vouchers; 

                                8           
<PAGE>
all upon such basis of compensation as may be agreed upon between the 
Trustees and the custodian. If so directed by a Majority Shareholder Vote, 
the custodian shall deliver and pay over all property of the Trust held by it 
as specified in such vote. 

   The Trustees may also authorize the custodian to employ one or more 
sub-custodians from time to time to perform such of the acts and services of 
the custodian and upon such terms and conditions as may be agreed upon 
between the custodian and such sub-custodian and approved by the Trustees. 

   SECTION 9.2. CENTRAL CERTIFICATE SYSTEM. Subject to such rules, 
regulations and orders as the Commission may adopt, the Trustees may direct 
the custodian to deposit all or any part of the securities owned by the Trust 
in a system for the central handling of securities established by a national 
securities exchange or a national securities association registered with the 
Commission under the Securities Exchange Act of 1934, or such other person as 
may be permitted by the Commission, or otherwise in accordance with the 1940 
Act, pursuant to which system all securities of any particular class or 
series of any issuer deposited within the system are treated as fungible and 
may be transferred or pledged by bookkeeping entry without physical delivery 
of such securities, provided that all such deposits shall be subject to 
withdrawal only upon the order of the Trust. 

                                  ARTICLE X 

                               WAIVER OF NOTICE 

   Whenever any notice of the time, place or purpose of any meeting of 
Shareholders, Trustees, or of any committee is required to be given in 
accordance with law or under the provisions of the Declaration or these 
By-Laws, a waiver thereof in writing, signed by the person or persons 
entitled to such notice and filed with the records of the meeting, whether 
before or after the holding thereof, or actual attendance at the meeting of 
shareholders, Trustees or committee, as the case may be, in person, shall be 
deemed equivalent to the giving of such notice to such person. 

                                  ARTICLE XI 

                                MISCELLANEOUS 

   SECTION 11.1. LOCATION OF BOOKS AND RECORDS. The books and records of the 
Trust may be kept outside the Commonwealth of Massachusetts at such place or 
places as the Trustees may from time to time determine, except as otherwise 
required by law. 

   SECTION 11.2 RECORD DATE. The Trustees may fix in advance a date as the 
record date for the purpose of determining the Shareholders entitled to (i) 
receive notice of, or to vote at, any meeting of Shareholders, or (ii) 
receive payment of any dividend or the allotment of any rights, or in order 
to make a determination of Shareholders for any other proper purpose. The 
record date, in any case, shall not be more than one hundred eighty (180) 
days, and in the case of a meeting of Shareholders not less than ten (10) 
days, prior to the date on which such meeting is to be held or the date on 
which such other particular action requiring determination of Shareholders is 
to be taken, as the case may be. In the case of a meeting of Shareholders, 
the meeting date set forth in the notice to Shareholders accompanying the 
proxy statement shall be the date used for purposes of calculating the 180 
day or 10 day period, and any adjourned meeting may be reconvened without a 
change in record date. In lieu of fixing a record date, the Trustees may 
provide that the transfer books shall be closed for a stated period but not 
to exceed, in any case, twenty (20) days. If the transfer books are closed 
for the purpose of determining Shareholders entitled to notice of a vote at a 
meeting of Shareholders, such books shall be closed for at least ten (10) 
days immediately preceding the meeting. 

   SECTION 11.3. SEAL. The Trustees shall adopt a seal, which shall be in 
such form and shall have such inscription thereon as the Trustees may from 
time to time provide. The seal of the Trust may be affixed to any document, 
and the seal and its attestation may be lithographed, engraved or otherwise 
printed on any document with the same force and effect as if it had been 
imprinted and attested manually in the same manner and with the same effect 
as if done by a Massachusetts business corporation under Massachusetts law. 

                                9           
<PAGE>
   SECTION 11.4. FISCAL YEAR. The fiscal year of the Trust shall end on such 
date as the Trustees may by resolution specify, and the Trustees may by 
resolution change such date for future fiscal years at any time and from time 
to time. 

   SECTION 11.5. ORDERS FOR PAYMENT OF MONEY. All orders or instructions for 
the payment of money of the Trust, and all notes or other evidences of 
indebtedness issued in the name of the Trust, shall be signed by such officer 
or officers or such other person or persons as the Trustees may from time to 
time designate, or as may be specified in or pursuant to the agreement 
between the Trust and the bank or trust company appointed as Custodian of the 
securities and funds of the Trust. 

                                 ARTICLE XII 

                     COMPLIANCE WITH FEDERAL REGULATIONS 

   The Trustees are hereby empowered to take such action as they may deem to 
be necessary, desirable or appropriate so that the Trust is or shall be in 
compliance with any federal or state statute, rule or regulation with which 
compliance by the Trust is required. 

                                 ARTICLE XIII 

                                  AMENDMENTS 

   These By-Laws may be amended, altered, or repealed, or new By-Laws may be 
adopted, (a) by a Majority Shareholder Vote, or (b) by the Trustees; 
provided, however, that no By-Law may be amended, adopted or repealed by the 
Trustees if such amendment, adoption or repeal requires, pursuant to law, the 
Declaration, or these By-Laws, a vote of the Shareholders. The Trustees shall 
in no event adopt By-Laws which are in conflict with the Declaration, and any 
apparent inconsistency shall be construed in favor of the related provisions 
in the Declaration. 

                                 ARTICLE XIV 

                             DECLARATION OF TRUST 

   The Declaration of Trust establishing Dean Witter U.S. Government 
Securities Trust, dated September 29, 1983, a copy of which is on file in the 
office of the Secretary of the Commonwealth of Massachusetts, provides that 
the name Dean Witter U.S. Government Securities 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 Dean 
Witter U.S. Government Securities 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 Dean Witter U.S. Government Securities Trust, but the Trust 
Estate only shall be liable. 

                               10           


<PAGE>
                              AMENDED AND RESTATED
                     TRANSFER AGENCY AND SERVICE AGREEMENT

                                      WITH

                             DEAN WITTER TRUST FSB



<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                      PAGE
                                                                      ----
<S>          <C>                                                      <C>
Article 1    Terms of Appointment...................................    1

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

Article 3    Representations and Warranties of DWTFSB...............    3

Article 4    Representations and Warranties of the Fund.............    3

Article 5    Duty of Care and Indemnification.......................    3

Article 6    Documents and Covenants of the Fund and DWTFSB.........    4

Article 7    Duration and Termination of Agreement..................    5

Article 8    Assignment.............................................    5

Article 9    Affiliations...........................................    6

Article 10   Amendment..............................................    6

Article 11   Applicable Law.........................................    6

Article 12   Miscellaneous..........................................    6

Article 13   Merger of Agreement....................................    7

Article 14   Personal Liability.....................................    7
</TABLE>

                                       i
<PAGE>
           AMENDED AND RESTATED TRANSFER AGENCY AND SERVICE AGREEMENT

    AMENDED AND RESTATED AGREEMENT made as of the 1st day of August, 1997 by
and between each of the Funds listed on the signature pages hereof, each of such
Funds acting severally on its own behalf and not jointly with any of such other
Funds (each such Fund hereinafter referred to as the "Fund"), each such Fund
having its principal office and place of business at Two World Trade Center, New
York, New York, 10048, and DEAN WITTER TRUST FSB ("DWTFSB"), a federally
chartered savings bank, having its principal office and place of business at
Harborside Financial Center, Plaza Two, Jersey City, New Jersey 07311.

    WHEREAS, the Fund desires to appoint DWTFSB as its transfer agent, dividend
disbursing agent and shareholder servicing agent and DWTFSB desires to accept
such appointment;

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

Article 1  TERMS OF APPOINTMENT; DUTIES OF DWTFSB

    1.1 Subject to the terms and conditions set forth in this Agreement, the
Fund hereby employs and appoints DWTFSB to act as, and DWTFSB agrees to act as,
the transfer agent for each series and class of shares of the Fund, whether now
or hereafter authorized or issued ("Shares"), dividend disbursing agent and
shareholder servicing agent in connection with any accumulation, open-account or
similar plans provided to the holders of such Shares ("Shareholders") and set
out in the currently effective prospectus and statement of additional
information ("prospectus") of the Fund, including without limitation any
periodic investment plan or periodic withdrawal program.

    1.2 DWTFSB agrees that it will perform the following services:

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

           (i) Receive for acceptance, orders for the purchase of Shares, and
       promptly deliver payment and appropriate documentation therefor to the
       custodian of the assets of the Fund (the "Custodian");

           (ii) Pursuant to purchase orders, issue the appropriate number of
       Shares and issue certificates therefor or hold such Shares in book form
       in the appropriate Shareholder account;

           (iii) Receive for acceptance redemption requests and redemption
       directions and deliver the appropriate documentation therefor to the
       Custodian;

           (iv) At the appropriate time as and when it receives monies paid to
       it by the Custodian with respect to any redemption, pay over or cause to
       be paid over in the appropriate manner such monies as instructed by the
       redeeming Shareholders;

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

           (vi) Prepare and transmit payments for dividends and distributions
       declared by the Fund;

           (vii) Calculate any sales charges payable by a Shareholder on
       purchases and/or redemptions of Shares of the Fund as such charges may be
       reflected in the prospectus;

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

           (ix) Record the issuance of Shares of the Fund and maintain pursuant
       to Rule 17Ad-10(e) under the Securities Exchange Act of 1934 ("1934 Act")
       a record of the total number of Shares of the Fund which are authorized,
       based upon data provided to it by the Fund, and issued and outstanding.
       DWTFSB shall also provide to the Fund on a regular basis the total number
       of Shares that are authorized, issued and outstanding and shall notify
       the Fund in case any proposed issue of Shares by the Fund would result in
       an overissue. In case any issue of Shares

                                       1
<PAGE>
       would result in an overissue, DWTFSB shall refuse to issue such Shares
       and shall not countersign and issue any certificates requested for such
       Shares. When recording the issuance of Shares, DWTFSB shall have no
       obligation to take cognizance of any Blue Sky laws relating to the issue
       of sale of such Shares, which functions shall be the sole responsibility
       of the Fund.

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

           (i) perform all of the customary services of a transfer agent,
       dividend disbursing agent and, as relevant, shareholder servicing agent
       in connection with dividend reinvestment, accumulation, open-account or
       similar plans (including without limitation any periodic investment plan
       or periodic withdrawal program), including but not limited to,
       maintaining all Shareholder accounts, preparing Shareholder meeting
       lists, mailing proxies, receiving and tabulating proxies, mailing
       shareholder reports and prospectuses to current Shareholders, withholding
       taxes on U.S. resident and non-resident alien accounts, preparing and
       filing appropriate forms required with respect to dividends and
       distributions by federal tax authorities for all Shareholders, preparing
       and mailing confirmation forms and statements of account to Shareholders
       for all purchases and redemptions of Shares and other confirmable
       transactions in Shareholder accounts, preparing and mailing activity
       statements for Shareholders and providing Shareholder account
       information;

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

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

        (c) In addition, the Fund shall:

           (i) identify to DWTFSB in writing those transactions and assets to be
       treated as exempt from Blue Sky reporting for each State; and

           (ii) verify the inclusion on the system prior to activation of each
       State in which Fund shares may be sold and thereafter monitor the daily
       purchases and sales for shareholders in each State. The responsibility of
       DWTFSB for the Fund's status under the securities laws of any State or
       other jurisdiction is limited to the inclusion on the system of each
       State as to which the Fund has informed DWTFSB that shares may be sold in
       compliance with state securities laws and the reporting of purchases and
       sales in each such State to the Fund as provided above and as agreed from
       time to time by the Fund and DWTFSB.

        (d) DWTFSB shall provide such additional services and functions not
    specifically described herein as may be mutually agreed between DWTFSB and
    the Fund. Procedures applicable to such services may be established from
    time to time by agreement between the Fund and DWTFSB.

Article 2  FEES AND EXPENSES

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

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

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

                                       2
<PAGE>
Article 3  REPRESENTATIONS AND WARRANTIES OF DWTFSB

    DWTFSB represents and warrants to the Fund that:

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

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

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

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

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

Article 4  REPRESENTATIONS AND WARRANTIES OF THE FUND

    The Fund represents and warrants to DWTFSB that:

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

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

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

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

    4.5 A registration statement under the Securities Act of 1933 (the "1933
Act") is currently effective and will remain effective, and appropriate state
securities law filings have been made and will continue to be made, with respect
to all Shares of the Fund being offered for sale.

Article 5  DUTY OF CARE AND INDEMNIFICATION

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

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

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

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

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

        (e) The offer or sale of Shares in violation of any requirement under
    the federal securities laws or regulations or the securities or Blue Sky
    laws of any State or other jurisdiction that notice of

                                       3
<PAGE>
    offering of such Shares in such State or other jurisdiction or in violation
    of any stop order or other determination or ruling by any federal agency or
    any State or other jurisdiction with respect to the offer or sale of such
    Shares in such State or other jurisdiction.

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

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

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

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

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

Article 6  DOCUMENTS AND COVENANTS OF THE FUND AND DWTFSB

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

        (a) If a corporation:

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

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

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

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

                                       4
<PAGE>
        (b) If a business trust:

           (i) A certified copy of the resolution of the Board of Trustees of
       the Fund authorizing the appointment of DWTFSB and the execution and
       delivery of this Agreement;

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

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

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

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

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

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

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

    6.3 DWTFSB shall prepare and keep records relating to the services to be
performed hereunder, in the form and manner as it may deem advisable and as
required by applicable laws and regulations. To the extent required by Section
31 of the 1940 Act, and the rules and regulations thereunder, DWTFSB agrees that
all such records prepared or maintained by DWTFSB relating to the services
performed by DWTFSB hereunder are the property of the Fund and will be
preserved, maintained and made available in accordance with such Section 31 of
the 1940 Act, and the rules and regulations thereunder, and will be surrendered
promptly to the Fund on and in accordance with its request.

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

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

Article 7  DURATION AND TERMINATION OF AGREEMENT

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

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

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

Article 8  ASSIGNMENT

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

                                       5
<PAGE>
    8.2 This Agreement shall inure to the benefit of and be binding upon the
parties and their respective permitted successors and assigns.

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

Article 9  AFFILIATIONS

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

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

Article 10  AMENDMENT

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

Article 11  APPLICABLE LAW

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

Article 12  MISCELLANEOUS

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

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

    12.3 In the event that any check or other order for payment of money on the
account of any Shareholder or new investor is returned unpaid for any reason,
DWTFSB will (a) give prompt notification to the Fund's distributor
("Distributor") (or to the Fund if the Fund acts as its own distributor) of such
non-payment; and (b) take such other action, including imposition of a
reasonable processing or handling fee, as DWTFSB may, in its sole discretion,
deem appropriate or as the Fund and, if applicable, the Distributor may instruct
DWTFSB.

                                       6
<PAGE>
    12.4 Any notice or other instrument authorized or required by this Agreement
to be given in writing to the Fund or to DWTFSB shall be sufficiently given if
addressed to that party and received by it at its office set forth below or at
such other place as it may from time to time designate in writing.

To the Fund:

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

Attention: General Counsel

To DWTFSB:

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

Attention: President

Article 13  MERGER OF AGREEMENT

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

Article 14  PERSONAL LIABILITY

    14.1 In the case of a Fund organized as a Massachusetts business trust, a
copy of the Declaration of Trust of the Fund is on file with the Secretary of
The Commonwealth of Massachusetts, and notice is hereby given that this
instrument is executed on behalf of the Board of Trustees of the Fund as
Trustees and not individually and that the obligations of this instrument are
not binding upon any of the Trustees or shareholders individually but are
binding only upon the assets and property of the Fund; provided, however, that
the Declaration of Trust of the Fund provides that the assets of a particular
Series of the Fund shall under no circumstances be charged with liabilities
attributable to any other Series of the Fund and that all persons extending
credit to, or contracting with or having any claim against, a particular Series
of the Fund shall look only to the assets of that particular Series for payment
of such credit, contract or claim.

    IN WITNESS WHEREOF, the parties hereto have caused this Amended and Restated
Agreement to be executed in their names and on their behalf by and through their
duly authorized officers, as of the day and year first above written.

DEAN WITTER FUNDS

    MONEY MARKET FUNDS

 1.  Dean Witter Liquid Asset Fund Inc.
 2.  Active Assets Money Trust
 3.  Dean Witter U.S. Government Money Market Trust
 4.  Active Assets Government Securities Trust
 5.  Dean Witter Tax-Free Daily Income Trust
 6.  Active Assets Tax-Free Trust
 7.  Dean Witter California Tax-Free Daily Income Trust
 8.  Dean Witter New York Municipal Money Market Trust
 9.  Active Assets California Tax-Free Trust

    EQUITY FUNDS

10.  Dean Witter American Value Fund
11.  Dean Witter Mid-Cap Growth Fund
12.  Dean Witter Dividend Growth Securities Inc.

                                       7
<PAGE>
13.  Dean Witter Capital Growth Securities
14.  Dean Witter Global Dividend Growth Securities
15.  Dean Witter Income Builder Fund
16.  Dean Witter Natural Resource Development Securities Inc.
17.  Dean Witter Precious Metals and Minerals Trust
18.  Dean Witter Developing Growth Securities Trust
19.  Dean Witter Health Sciences Trust
20.  Dean Witter Capital Appreciation Fund
21.  Dean Witter Information Fund
22.  Dean Witter Value-Added Market Series
23.  Dean Witter World Wide Investment Trust
24.  Dean Witter European Growth Fund Inc.
25.  Dean Witter Pacific Growth Fund Inc.
26.  Dean Witter International SmallCap Fund
27.  Dean Witter Japan Fund
28.  Dean Witter Utilities Fund
29.  Dean Witter Global Utilities Fund
30.  Dean Witter Special Value Fund
31.  Dean Witter Financial Services Trust
32.  Dean Witter Market Leader Trust
33.  Dean Witter Managers' Select Fund
34.  Dean Witter Fund of Funds
35.  Dean Witter S&P 500 Index Fund

    BALANCED FUNDS

36.  Dean Witter Balanced Growth Fund
37.  Dean Witter Balanced Income Trust

    ASSET ALLOCATION FUNDS

38.  Dean Witter Strategist Fund
39.  Dean Witter Global Asset Allocation Fund

    FIXED INCOME FUNDS

40.  Dean Witter High Yield Securities Inc.
41.  Dean Witter High Income Securities
42.  Dean Witter Convertible Securities Trust
43.  Dean Witter Intermediate Income Securities
44.  Dean Witter Short-Term Bond Fund
45.  Dean Witter World Wide Income Trust
46.  Dean Witter Global Short-Term Income Fund Inc.
47.  Dean Witter Diversified Income Trust
48.  Dean Witter U.S. Government Securities Trust
49.  Dean Witter Federal Securities Trust
50.  Dean Witter Short-Term U.S. Treasury Trust
51.  Dean Witter Intermediate Term U.S. Treasury Trust
52.  Dean Witter Tax-Exempt Securities Trust
53.  Dean Witter National Municipal Trust
55.  Dean Witter Limited Term Municipal Trust
55.  Dean Witter California Tax-Free Income Fund
56.  Dean Witter New York Tax-Free Income Fund
57.  Dean Witter Hawaii Municipal Trust
58.  Dean Witter Multi-State Municipal Series Trust
59.  Dean Witter Select Municipal Reinvestment Fund

                                       8
<PAGE>
    SPECIAL PURPOSE FUNDS

60.  Dean Witter Retirement Series
61.  Dean Witter Variable Investment Series
62.  Dean Witter Select Dimensions Investment Series

    TCW/DW FUNDS

63.  TCW/DW Core Equity Trust
64.  TCW/DW North American Government Income Trust
65.  TCW/DW Latin American Growth Fund
66.  TCW/DW Income and Growth Fund
67.  TCW/DW Small Cap Growth Fund
68.  TCW/DW Balanced Fund
69.  TCW/DW Total Return Trust
70.  TCW/DW Global Telecom Trust
71.  TCW/DW Strategic Income Trust
72.  TCW/DW Mid-Cap Equity Trust

                                          By: __________________________________
                                             Barry Fink
                                             Vice President and General Counsel

ATTEST:

_____________________________
Assistant Secretary

                                          DEAN WITTER TRUST FSB

                                          By: __________________________________
                                             John Van Heuvelen
                                             President

ATTEST:

_____________________________
Executive Vice President

                                       9
<PAGE>
                                   EXHIBIT A
 
Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, NJ 07311
 
Gentlemen:
 
    The undersigned, (INSET NAME OF INVESTMENT COMPANY) a (Massachusetts
business trust/Maryland corporation) (the "Fund"), desires to employ and appoint
Dean Witter Trust FSB ("DWTFSB") to act as transfer agent for each series and
class of shares of the Fund, whether now or hereafter authorized or issued
("Shares"), dividend disbursing agent and shareholder servicing agent, registrar
and agent in connection with any accumulation, open-account or similar plan
provided to the holders of Shares, including without limitation any periodic
investment plan or periodic withdrawal plan.
 
    The Fund hereby agrees that, in consideration for the payment by the Fund to
DWTFSB of fees as set out in the fee schedule attached hereto as Schedule A,
DWTFSB shall provide such services to the Fund pursuant to the terms and
conditions set forth in the Transfer Agency and Service Agreement annexed
hereto, as if the Fund was a signatory thereto.

    Please indicate DWTFSB's acceptance of employment and appointment by the
Fund in the capacities set forth above by so indicating in the space provided
below.
 
                                          Very truly yours,
 
                                          (NAME OF FUND)
 
                                          By:  _________________________________
                                              Barry Fink
                                              Vice President and General Counsel
 
ACCEPTED AND AGREED TO:
 
DEAN WITTER TRUST FSB
 
By: __________________________________
 
Its: _________________________________
 
Date: ________________________________
 


                                        10

<PAGE>

                                      SCHEDULE A


Fund:         Dean Witter U.S. Government Securities Trust

Fees:         (1)  Annual maintenance fee of $13.20 per shareholder account,
              payable monthly.

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

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

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



<PAGE>



CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the use in the Statement of Additional Information
constituting part of this Post-Effective Amendment No. 16 to the registration 
statement on Form N-1A (the "Registration Statement") of our report dated 
February 9, 1998, relating to the financial statements and financial 
highlights of Dean Witter US Government Securities Trust, which appears in 
such Statement of Additional Information, and to the incorporation by reference 
of our report into the Prospectus which constitutes part of this Registration 
Statement. We also consent to the references to us under the headings 
"Independent Accountants" and "Experts" in such Statement of Additional 
Information and to the reference to us under the heading "Financial Highlights" 
in such Prospectus.


/s/ PRICE WATERHOUSE LLP
PRICE WATERHOUSE LLP
1177 Avenue of the Americas
New York, New York 10036
April 14, 1998





<PAGE>

            DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST

             SCHEDULE OF COMPUTATION OF YIELD QUOTATION
                               12/31/97


CLASS A
                                   6
YIELD = 2 { [ ((a-b) /cd)  +1]  -1}



WHERE: a = Dividends and interest earned during the period
       b = Expenses accrued for the period
       c = The average daily number of shares outstanding
       d = The maximum offering price per share on the last
           day of the period

                                                                   6
YIELD = 2 { [ ((111,771.32-11,879.83) /2,076,833.420 X 9.49)+1] -1}

                                              =     6.16%



<PAGE>
                 SCHEDULE FOR COMPUTATIONS OF PERFORMANCE QUOTATIONS
                         U.S. GOVERNMENT SECURITIES TRUST(A)




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

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

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

<TABLE>
<CAPTION>
                                                                                    (A)
  $1,000          ERV AS OF     AGGREGATE          NUMBER OF                  AVERAGE ANNUAL 
INVESTED - P      31-Dec-97    TOTAL RETURN        YEARS - n                  TOTAL RETURN - T
- -------------    -----------  --------------      -----------                 ----------------
<S>              <C>          <C>                 <C>                         <C>
 28-Jul-97          $991.00      -0.90%                 0.43                      NA
</TABLE>

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


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



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

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


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

<TABLE>
<CAPTION>
                                          (C)                                            (B)
  $1,000          EV AS OF             TOTAL                 NUMBER OF                   AVERAGE ANNUAL
INVESTED - P      31-Dec-97            RETURN - TR           YEARS - n                   TOTAL RETURN - t
- -------------    -----------           -------------------   -----------------           ----------------
<S>              <C>                   <C>                   <C>                         <C>
 28-Jul-97        $1,035.00                  3.50%                       0.43                   NA
</TABLE>


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

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


<TABLE>
<CAPTION>
                 TOTAL                  (D)   GROWTH OF       (E)   GROWTH OF             (D)   GROWTH OF
INVESTED - P     RETURN - TR           $10,000 INVESTMENT-G  $50,000 INVESTMENT - G      $100,000 INVESTMENT - G
- ------------     -----------           --------------------  ----------------------      -----------------------
<S>              <C>                   <C>                   <C>                         <C>
 28-Jul-97             3.50                $9,910                     $49,939                   $100,654
</TABLE>

*INITIAL INVESTMENT $9,575, $48,250 & 97,250 RESPECTIVELY REFLECTS A 4.25%, 
3.5% & 2.75% SALES CHARGE

<PAGE>

          DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST

           SCHEDULE OF COMPUTATION OF YIELD QUOTATION
                            12/31/97



CLASS B

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



WHERE:    a = Dividends and interest earned during the period
          b = Expenses accrued for the period
          c = The average daily number of shares outstanding
          d = The maximum offering price per share on the last 
              day of the period

                                                                            6
YIELD = 2 { [ ((32,261,034.98-5,657,581.39) /598,618,978.792 X9.10 ) +1] -1}

                                           =      5.93%


<PAGE>

                 SCHEDULE FOR COMPUTATIONS OF PERFORMANCE QUOTATIONS
                         U.S. GOVERNMENT SECURITIES TRUST(B)




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

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

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

<TABLE>
<CAPTION>
                                                                 (A)
  $1,000         ERV AS OF             NUMBER OF             AVERAGE ANNUAL 
INVESTED - P      31-Dec-97            YEARS - n             TOTAL RETURN - T
- -------------    -----------           -----------           ----------------------
<S>              <C>                   <C>                   <C>
 31-Dec-96        $1,035.60                     1                        3.56%

 31-Dec-92        $1,331.80                     5                        5.90%

 31-Dec-87        $2,048.90                    10                        7.44%
</TABLE>


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

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

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

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


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

<TABLE>
<CAPTION>
                                          (C)                                                (B)
  $1,000         EV AS OF              TOTAL                 NUMBER OF                   AVERAGE ANNUAL 
INVESTED - P      31-Dec-97            RETURN - TR           YEARS - n                   TOTAL RETURN - t
- -------------    -----------           -----------           -----------------           ------------------------
<S>              <C>                   <C>                   <C>                         <C>
 31-Dec-96        $1,085.60                  8.56%                          1                       8.56%

 31-Dec-92        $1,351.40                 35.14%                          5                       6.21%

 31-Dec-87        $2,048.90                104.89%                         10                       7.44%
</TABLE>

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

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

<TABLE>
<CAPTION>
                                       (E)                   (F)                         (G)
$10,000          TOTAL                 GROWTH OF             GROWTH OF                   GROWTH OF
INVESTED - P     RETURN - TR           $10,000 INVESTMENT-G  $50,000 INVESTMENT-G        $100,000 INVESTMENT-G
- -----------      -----------           --------------------  --------------------        ---------------------
<S>              <C>                   <C>                   <C>                         <C>
 29-Jun-84           191.26               $29,126                    $145,630                   $291,260
</TABLE>


<PAGE>

          DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST

           SCHEDULE OF COMPUTATION OF YIELD QUOTATION
                          12/31/97


CLASS C

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



WHERE:    a = Dividends and interest earned during the period
          b = Expenses accrued for the period
          c = The average daily number of shares outstanding
          d = The maximum offering price per share on the last
              day of the period


                                                               6
YIELD = 2 { [ ((23,268.37-4,123.91) /428,661.667 X9.17) +1] -1}

                                           =      5.92%

<PAGE>

                 SCHEDULE FOR COMPUTATIONS OF PERFORMANCE QUOTATIONS
                         U.S. GOVERNMENT SECURITIES TRUST(C)




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

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

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

<TABLE>
<CAPTION>
                                                                                  (A)
  $1,000         ERV AS OF     AGGREGATE          NUMBER OF                   AVERAGE ANNUAL 
INVESTED - P      31-Dec-97   TOTAL RETURN        YEARS - n                   TOTAL RETURN - T
- -------------    -----------  --------------      -----------                 ----------------
<S>              <C>          <C>                 <C>                         <C>
 28-Jul-97        $1,031.40       3.14%                 0.43                      NA
</TABLE>


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

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




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

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


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

<TABLE>
<CAPTION>
                                          (C)                                            (B)
  $1,000          EV AS OF             TOTAL                 NUMBER OF                   AVERAGE ANNUAL
INVESTED - P      31-Dec-97            RETURN - TR           YEARS - n                   TOTAL RETURN - t
- -------------    -----------           -------------------   -----------------           ----------------
<S>              <C>                   <C>                   <C>                         <C>
 28-Jul-97        $1,041.40                  4.14%                       0.43                   NA
</TABLE>


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

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

<TABLE>
<CAPTION>
                 TOTAL                  (D)   GROWTH OF       (E)   GROWTH OF             (D)   GROWTH OF
INVESTED - P     RETURN - TR           $10,000 INVESTMENT-G  $50,000 INVESTMENT - G      $100,000 INVESTMENT - G
- ------------     -----------           --------------------  ----------------------      -----------------------
<S>              <C>                   <C>                   <C>                         <C>
 28-Jul-97             4.14               $10,414                     $52,070                   $104,140
</TABLE>


<PAGE>

          DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST

           SCHEDULE OF COMPUTATION OF YIELD QUOTATION
                         12/31/97


CLASS D

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



WHERE:    a = Dividends and interest earned during the period
          b = Expenses accrued for the period
          c = The average daily number of shares outstanding
          d = The maximum offering price per share on the last
              day of the period


                                                                  6
YIELD = 2 { [ ((66,194.62-4,715.65) /1,227,915.637 X 9.11) +1] -1}

                                           =      6.69%

<PAGE>

                 SCHEDULE FOR COMPUTATIONS OF PERFORMANCE QUOTATIONS
                         U.S. GOVERNMENT SECURITIES TRUST(D)



(A) TOTAL RETURN (NO LOAD FUND)



(B) AVERAGE ANNUAL TOTAL RETURNS (NO LOAD FUND)

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

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


             t = AVERAGE ANNUAL COMPOUND RETURN 
             n = NUMBER OF YEARS
            EV = ENDING VALUE 
             P = INITIAL INVESTMENT
            TR = TOTAL RETURN 

<TABLE>
<CAPTION>
                                          (A)                                                    (B)
  $1,000         EV AS OF              TOTAL                 NUMBER OF                   AVERAGE ANNUAL 
INVESTED - P      31-Dec-97            RETURN - TR           YEARS - n                   COMPOUND RETURN - t
- -------------    -----------           -----------           -----------------           ------------------------
<S>              <C>                   <C>                   <C>                         <C>
 28-Jul-97        $1,038.70                  3.87%                       0.43                   NA
</TABLE>

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


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

<TABLE>
<CAPTION>
$10,000          TOTAL                  (C)   GROWTH OF         (D)   GROWTH OF            (E)   GROWTH OF
INVESTED - P     RETURN - TR           $10,000 INVESTMENT-G   $50,000 INVESTMENT- G     $100,000 INVESTMENT- G
- -----------      -----------           --------------------   ---------------------     -----------------------
<S>              <C>                   <C>                    <C>                         <C>
 28-Jul-97             3.87               $10,387                     $51,935                   $103,870
</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<SERIES>
   <NUMBER> 01
   <NAME> U.S. GOV SEC TRUST CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                    5,197,716,625
<INVESTMENTS-AT-VALUE>                   5,458,752,520
<RECEIVABLES>                               31,665,883
<ASSETS-OTHER>                                  73,731
<OTHER-ITEMS-ASSETS>                           160,038
<TOTAL-ASSETS>                           5,490,652,172
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                   25,235,878
<TOTAL-LIABILITIES>                         25,235,878
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 6,228,468,468
<SHARES-COMMON-STOCK>                        2,292,255
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                (1,024,088,069)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   261,035,895
<NET-ASSETS>                                20,841,089
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                          437,653,070
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              73,852,603
<NET-INVESTMENT-INCOME>                    363,800,467
<REALIZED-GAINS-CURRENT>                   (3,836,410)
<APPREC-INCREASE-CURRENT>                  118,550,225
<NET-CHANGE-FROM-OPS>                      478,514,282
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (342,413)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      2,724,542
<NUMBER-OF-SHARES-REDEEMED>                  (440,236)
<SHARES-REINVESTED>                              7,949
<NET-CHANGE-IN-ASSETS>                   (984,121,862)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                        (4,722)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       24,916,951
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             73,852,603
<AVERAGE-NET-ASSETS>                        12,271,020
<PER-SHARE-NAV-BEGIN>                             9.03
<PER-SHARE-NII>                                    .25
<PER-SHARE-GAIN-APPREC>                            .06
<PER-SHARE-DIVIDEND>                             (.25)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.09
<EXPENSE-RATIO>                                    .77
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<SERIES>
   <NUMBER> 02
   <NAME> U.S. GOVERNMENT SECURITIES TRUST (CLASS B)
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                    5,197,716,625
<INVESTMENTS-AT-VALUE>                   5,458,752,520
<RECEIVABLES>                               31,665,883
<ASSETS-OTHER>                                  73,731
<OTHER-ITEMS-ASSETS>                           160,038
<TOTAL-ASSETS>                           5,490,652,172
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                   23,235,878
<TOTAL-LIABILITIES>                         23,235,878
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 6,228,468,468
<SHARES-COMMON-STOCK>                      596,277,853
<SHARES-COMMON-PRIOR>                      723,414,184
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                (1,024,088,069)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   261,035,895
<NET-ASSETS>                             5,428,823,433
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                          437,653,070
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              73,852,603
<NET-INVESTMENT-INCOME>                    363,800,467
<REALIZED-GAINS-CURRENT>                   (3,836,410)
<APPREC-INCREASE-CURRENT>                  118,550,225
<NET-CHANGE-FROM-OPS>                      478,514,282
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                (363,065,315)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     67,708,563
<NUMBER-OF-SHARES-REDEEMED>              (214,633,493)
<SHARES-REINVESTED>                         20,782,743
<NET-CHANGE-IN-ASSETS>                   (984,121,862)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                        (4,722)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       24,916,951
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             73,852,603
<AVERAGE-NET-ASSETS>                     5,834,240,739
<PER-SHARE-NAV-BEGIN>                             8.92
<PER-SHARE-NII>                                    .56
<PER-SHARE-GAIN-APPREC>                            .18
<PER-SHARE-DIVIDEND>                             (.56)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.10
<EXPENSE-RATIO>                                   1.26
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<SERIES>
   <NUMBER> 03
   <NAME> U.S. GOVERNMENT SECURITIES TRUST (CLASS C)
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                    5,197,716,625
<INVESTMENTS-AT-VALUE>                   5,458,752,520
<RECEIVABLES>                               31,665,883
<ASSETS-OTHER>                                  73,731
<OTHER-ITEMS-ASSETS>                           160,038
<TOTAL-ASSETS>                           5,490,652,172
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                   25,235,878
<TOTAL-LIABILITIES>                         25,235,878
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 6,228,468,468
<SHARES-COMMON-STOCK>                          478,135
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                (1,024,088,069)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   261,035,895
<NET-ASSETS>                                 4,384,815
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                          437,653,070
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              73,852,603
<NET-INVESTMENT-INCOME>                    363,800,467
<REALIZED-GAINS-CURRENT>                   (3,836,410)
<APPREC-INCREASE-CURRENT>                  118,550,225
<NET-CHANGE-FROM-OPS>                      478,514,282
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (61,336)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        552,334
<NUMBER-OF-SHARES-REDEEMED>                   (79,129)
<SHARES-REINVESTED>                              4,930
<NET-CHANGE-IN-ASSETS>                   (984,121,862)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                        (4,722)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       24,916,951
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             73,852,603
<AVERAGE-NET-ASSETS>                         2,484,794
<PER-SHARE-NAV-BEGIN>                             9.03
<PER-SHARE-NII>                                    .23
<PER-SHARE-GAIN-APPREC>                            .14
<PER-SHARE-DIVIDEND>                             (.23)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.17
<EXPENSE-RATIO>                                   1.25
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<SERIES>
   <NUMBER> 04
   <NAME> U.S. GOVERNMENT SECURITIES TRUST (CLASS D)
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                    5,197,716,625
<INVESTMENTS-AT-VALUE>                   5,458,752,520
<RECEIVABLES>                               31,665,883
<ASSETS-OTHER>                                  73,731
<OTHER-ITEMS-ASSETS>                           160,038
<TOTAL-ASSETS>                           5,490,652,172
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                   25,235,878
<TOTAL-LIABILITIES>                         25,235,878
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 6,228,468,468
<SHARES-COMMON-STOCK>                        1,248,136
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                (1,024,088,069)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   261,035,895
<NET-ASSETS>                                11,366,957
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                          437,653,070
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              73,852,603
<NET-INVESTMENT-INCOME>                    363,800,467
<REALIZED-GAINS-CURRENT>                   (3,836,410)
<APPREC-INCREASE-CURRENT>                  118,550,225
<NET-CHANGE-FROM-OPS>                      478,514,282
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (326,681)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        324,174
<NUMBER-OF-SHARES-REDEEMED>                  (104,962)
<SHARES-REINVESTED>                             34,780
<NET-CHANGE-IN-ASSETS>                   (984,121,862)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                        (4,722)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       24,916,951
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             73,852,603
<AVERAGE-NET-ASSETS>                         9,451,138
<PER-SHARE-NAV-BEGIN>                             9.03
<PER-SHARE-NII>                                    .27
<PER-SHARE-GAIN-APPREC>                            .08
<PER-SHARE-DIVIDEND>                             (.27)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.11
<EXPENSE-RATIO>                                    .52
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<PAGE>



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


Dated: September 1, 1997



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


<PAGE>
                                     Schedule A 


 1. Active Assets Money Trust 
 2. Active Assets Tax-Free Trust 
 3. Active Assets Government Securities Trust
 4. Active Assets California Tax-Free Trust 
 5. Dean Witter New York Municipal Money Market Trust 
 6. Dean Witter American Value Fund 
 7. Dean Witter Tax-Exempt Securities Trust 
 8. Dean Witter Tax-Free Daily Income Trust
 9. Dean Witter Capital Growth Securities 
10. Dean Witter U.S. Government Money Market Trust
11. Dean Witter Precious Metals and Minerals Trust 
12. Dean Witter Developing Growth Securities Trust 
13. Dean Witter World Wide Investment Trust 
14. Dean Witter Value-Added Market Series
15. Dean Witter Utilities Fund 
16. Dean Witter Strategist Fund 
17. Dean Witter California Tax-Free Daily Income Trust 
18. Dean Witter Convertible Securities Trust 
19. Dean Witter Intermediate Income Securities 
20. Dean Witter World Wide Income Trust 
21. Dean Witter S&P 500 Index Fund
22. Dean Witter U.S. Government Securities Trust 
23. Dean Witter Federal Securities Trust
24. Dean Witter Multi-State Municipal Series Trust
25. Dean Witter California Tax-Free Income Fund 
26. Dean Witter New York Tax-Free Income Fund 
27. Dean Witter Select Municipal Reinvestment Fund 
28. Dean Witter Variable Investment Series
29. High Income Advantage Trust 
30. High Income Advantage Trust II
31. High Income Advantage Trust III 
32. InterCapital Insured Municipal Bond Trust
33. InterCapital Insured Municipal Trust
34. InterCapital Insured Municipal Income Trust
35. InterCapital Quality Municipal Investment Trust
36. InterCapital Quality Municipal Income Trust
37. Dean Witter Government Income Trust 
38. Municipal Income Trust 
39. Municipal Income Trust II 
40. Municipal Income Trust III 
41. Municipal Income Opportunities Trust 
42. Municipal Income Opportunities Trust II 
43. Municipal Income Opportunities Trust III 
44. Municipal Premium Income Trust 
45. Prime Income Trust 
46. Dean Witter Short-Term U.S. Treasury Trust
47. Dean Witter Diversified Income Trust

<PAGE>


48. InterCapital California Insured Municipal Income Trust
49. Dean Witter Health Sciences Trust
50. Dean Witter Global Dividend Growth Securities
51. InterCapital Quality Municipal Securities
52. InterCapital California Quality Municipal Securities
53. InterCapital New York Quality Municipal Securities
54. Dean Witter Retirement Series
55. Dean Witter Limited Term Municipal Trust
56. Dean Witter Short-Term Bond Fund
57. Dean Witter Global Utilities Fund
58. InterCapital Insured Municipal Securities
59. InterCapital Insured California Municipal Securities
60. Dean Witter High Income Securities
61. Dean Witter National Municipal Trust
62. Dean Witter International SmallCap Fund
63. Dean Witter Mid-Cap Growth Fund
64. Dean Witter Select Dimensions Investment Series
65. Dean Witter Global Asset Allocation Fund
66. Dean Witter Balanced Growth Fund
67. Dean Witter Balanced Income Fund
68. Dean Witter Intermediate Term U.S. Treasury Trust
69. Dean Witter Hawaii Municipal Trust
70. Dean Witter Japan Fund
71. Dean Witter Capital Appreciation Fund
72. Dean Witter Information Fund
73. Dean Witter Fund of Funds
74. Dean Witter Special Value Fund
75. Dean Witter Income Builder Fund
76. Dean Witter Financial Services Trust
77. Dean Witter Market Leader Trust 
78. Dean Witter Managers' Select Fund 
79. Dean Witter Liquid Asset Fund Inc.
80. Dean Witter Natural Resource Development Securities Inc.
81. Dean Witter Dividend Growth Securities Inc.
82. Dean Witter European Growth Fund Inc.
83. Dean Witter Pacific Growth Fund Inc.
84. Dean Witter High Yield Securities Inc.
85. Dean Witter Global Short-Term Income Fund Inc.
86. InterCapital Income Securities Inc.
87. Morgan Stanley Dean Witter "Competitive Edge" Fund
88. Morgan Stanley Dean Witter Growth Fund
89. Morgan Stanley Dean Witter Mid-Cap Dividend Growth Securities
 


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