WITTER DEAN U S GOVERNMENT SECURITIES TRUST
485BPOS, 1997-03-27
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<PAGE>
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 27, 1997
    
                                                      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. 14                       /X/
    
                                     AND/OR
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                 ACT OF 1940                                 /X/
   
                               AMENDMENT NO. 16                              /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)
        ___ immediately upon filing pursuant to paragraph (b)
   
        _X_ on March 31, 1997 pursuant to paragraph (b)
    
        ___ 60 days after filing pursuant to paragraph (a)
        ___ on (date) pursuant to paragraph (a) of rule 485.
 
   
    THE  REGISTRANT HAS REGISTERED AN INDEFINITE  NUMBER OF ITS SHARES UNDER THE
SECURITIES ACT  OF 1933  PURSUANT TO  SECTION  (a)(1) OF  RULE 24f-2  UNDER  THE
INVESTMENT  COMPANY ACT OF 1940. THE REGISTRANT  HAS FILED THE RULE 24f-2 NOTICE
FOR ITS FISCAL  YEAR ENDED DECEMBER  31, 1996 WITH  THE SECURITIES AND  EXCHANGE
COMMISSION ON FEBRUARY 3, 1997.
    
 
           AMENDING THE PROSPECTUS AND UPDATING FINANCIAL STATEMENTS
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<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; Report of Independent Accountants; Financial
                                                 Statements; 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
              MARCH 31, 1997
    
 
              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.
 
               Shares of the Fund are continuously offered at net asset value.
However, redemptions and/or repurchases are subject in most cases to a
contingent deferred sales charge, scaled down from 5% to 1% of the amount
redeemed, if made within six years of purchase, which charge will be paid to the
Fund's Distributor, Dean Witter Distributors Inc. See "Redemptions and
Repurchases--Contingent Deferred Sales Charge." In addition, the Fund pays the
Distributor a Rule 12b-1 distribution fee pursuant to a Plan of Distribution at
the annual rate of 0.75% (0.65% on amounts over $10 billion) of the lesser of
the (i) average daily aggregate net sales or (ii) average daily net assets of
the Fund. See "Purchase of Fund Shares--Plan of Distribution."
 
   
               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 March 31, 1997, 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/3
Financial Highlights/4
The Fund and its Management/5
Investment Objective and Policies/5
  Risk Considerations/9
Purchase of Fund Shares/11
Shareholder Services/13
Redemptions and Repurchases/16
Dividends, Distributions and Taxes/18
Performance Information/19
Additional Information/20
    
 
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
<PAGE>
PROSPECTUS SUMMARY
- --------------------------------------------------------------------------------
 
   
<TABLE>
<S>               <C>
The               The Fund is organized as a Trust, commonly known as a Massachusetts business trust, and is an
Fund              open-end diversified management investment company investing in obligations issued or guaranteed by
                  the U.S. Government.
- ----------------------------------------------------------------------------------------------------------------------
Shares Offered    Shares of beneficial interest with $0.01 par value (see page 20).
- ----------------------------------------------------------------------------------------------------------------------
Offering          At net asset value without sales charge (see page 11). Shares redeemed within six years of purchase
Price             are subject to a contingent deferred sales charge under most circumstances (see page 16).
- ----------------------------------------------------------------------------------------------------------------------
Minimum           Minimum initial investment, $1,000 ($100 if the account is opened through EasyInvest-SM-); minimum
Purchase          subsequent investment, $100 (see page 11).
- ----------------------------------------------------------------------------------------------------------------------
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,
Manager           Dean Witter Services Company Inc., serve in various investment management, advisory, management and
                  administrative capacities to 102 investment companies and other portfolios with assets of
                  approximately $93 billion at February 28, 1997 (see page 5).
- ----------------------------------------------------------------------------------------------------------------------
Management        The Investment Manager receives a monthly fee at the annual rate of 0.50% ( 1/2 of 1%) of daily net
Fee               assets, 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 5).
- ----------------------------------------------------------------------------------------------------------------------
Dividends         Dividends are declared daily, and paid monthly either in additional shares of the Fund or, at the
                  shareholder's option, in cash (see page 18).
- ----------------------------------------------------------------------------------------------------------------------
Distributor and   Dean Witter Distributors Inc. (the "Distributor"). The Distributor receives from the Fund a
Distribution      distribution fee accrued daily and payable monthly at the rate of 0.75% per annum (0.65% on amounts
Fee               over $10 billion) of the lesser of (i) the Fund's average daily aggregate net sales or (ii) the
                  Fund's average daily net assets. The fee compensates the Distributor for the services provided in
                  distributing shares of the Fund and for sales-related expenses. The Distributor also receives the
                  proceeds of any contingent deferred sales charges (see pages 11-12 and 16-18).
- ----------------------------------------------------------------------------------------------------------------------
Redemption--      Shares are redeemable by the shareholder at net asset value. An account may be involuntarily
Contingent        redeemed if the total value of the account is less than $100 or, if the account was opened through
Deferred Sales    EasyInvest, if after twelve months the shareholder has invested less than $1,000 in the account.
Charge            Although no commission or sales charge is imposed upon the purchase of shares, a contingent deferred
                  sales charge (scaled down from 5% to 1%) is imposed on any redemption of shares if after such
                  redemption the aggregate current value of an account with the Fund falls below the aggregate amount
                  of the investor's purchase payments made during the six years preceding the redemption. However,
                  there is no charge imposed on redemption of shares purchased through reinvestment of dividends or
                  distributions (see pages 16-18).
- ----------------------------------------------------------------------------------------------------------------------
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 9-10).
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>
    
 
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                                   ELSEWHERE
       IN THIS PROSPECTUS AND IN THE STATEMENT OF ADDITIONAL INFORMATION
 
                                       2
<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 for  the
fiscal year ended December 31, 1996.
    
 
<TABLE>
<S>                                                                          <C>
SHAREHOLDER TRANSACTION EXPENSES
- ---------------------------------------------------------------------------
Maximum Sales Charge Imposed on Purchases..................................  None
Maximum Sales Charge Imposed on Reinvested Dividends.......................  None
Contingent Deferred Sales Charge
  (as a percentage of the lesser of original purchase price or redemption
   proceeds)...............................................................  5.0%
      A contingent deferred sales charge is imposed at the following
      declining rates:
</TABLE>
 
<TABLE>
<CAPTION>
YEAR SINCE PURCHASE
PAYMENT MADE                                                            PERCENTAGE
- ----------------------------------------------------------------------  -----------
<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>
 
   
<TABLE>
<S>                                                                          <C>
Redemption Fees............................................................  None
Exchange Fee...............................................................  None
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
- ---------------------------------------------------------------------------
Management Fees............................................................  0.42%
12b-1 Fees*................................................................  0.75%
Other Expenses.............................................................  0.08%
Total Fund Operating Expenses..............................................  1.25%
<FN>
- ------------
*  A PORTION OF  THE 12b-1 FEE  EQUAL TO 0.20%  OF THE FUND'S  AVERAGE DAILY NET
  ASSETS IS  CHARACTERIZED AS  A  SERVICE FEE  WITHIN  THE MEANING  OF  NATIONAL
  ASSOCIATION  OF SECURITIES DEALERS, INC. ("NASD") GUIDELINES (SEE "PURCHASE OF
  FUND SHARES").
</TABLE>
    
 
   
<TABLE>
<CAPTION>
EXAMPLE                                                       1 year   3 years  5 years  10 years
- ------------------------------------------------------------  -------  -------  -------  ---------
<S>                                                           <C>      <C>      <C>      <C>
You would pay the following expenses on a $1,000 investment,
 assuming (1) 5% annual return and (2) redemption at the end
 of each time period........................................    $ 63     $ 70     $ 89     $  151
You would pay the following expenses on the same investment,
 assuming no redemption.....................................    $ 13     $ 40     $ 69     $  151
</TABLE>
    
 
    THE ABOVE  EXAMPLE SHOULD  NOT BE  CONSIDERED A  REPRESENTATION OF  PAST  OR
FUTURE  EXPENSES OR PERFORMANCE. ACTUAL  EXPENSES OF THE FUND  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," "Plan  of  Distribution" and  "Redemptions and
Repurchases."
 
    Long-term shareholders  of  the Fund  may  pay  more in  sales  charges  and
distribution  fees than the  economic equivalent of  the maximum front-end sales
charges permitted by the NASD.
 
                                       3
<PAGE>
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
    The  following ratios and per share data  for a share of beneficial interest
outstanding throughout each period  have been audited  by 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.
 
   
<TABLE>
<CAPTION>
                                                            FOR THE YEAR ENDED DECEMBER 31,
                           -------------------------------------------------------------------------------------------------
                            1996      1995      1994      1993      1992      1991      1990      1989      1988      1987
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
<S>                        <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING
 PERFORMANCE:
  Net asset value,
   beginning of period...   $ 9.21    $ 8.41    $ 9.31    $ 9.30    $ 9.52    $ 9.37    $ 9.51    $ 9.42    $ 9.75    $10.33
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Net investment
   income................     0.56      0.57      0.58      0.64      0.74      0.87      0.90      0.91      0.97      0.96
  Net realized and
   unrealized gain
   (loss)................    (0.29)     0.80     (0.90)     0.01     (0.22)     0.15     (0.14)     0.09     (0.33)    (0.58)
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Total from investment
   operations............     0.27      1.37     (0.32)     0.65      0.52      1.02      0.76      1.00      0.64      0.38
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Less dividends from net
   investment income.....    (0.56)    (0.57)    (0.58)    (0.64)    (0.74)    (0.87)    (0.90)    (0.91)    (0.97)    (0.96)
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Net asset value, end of
   period................   $ 8.92    $ 9.21    $ 8.41    $ 9.31    $ 9.30    $ 9.52    $ 9.37    $ 9.51    $ 9.42    $ 9.75
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
TOTAL INVESTMENT
 RETURN+.................    3.16%    16.74%   (3.51)%     7.13%     5.76%    11.43%     8.49%    11.10%     6.74%     3.92%
  Ratios to average net
   assets:
    Expenses.............    1.25%     1.24%     1.22%     1.18%     1.20%     1.17%     1.23%     1.19%     1.21%     1.18%
    Net investment
     income..............    6.28%     6.44%     6.57%     6.78%     7.91%     9.23%     9.60%     9.62%    10.01%     9.63%
SUPPLEMENTAL DATA:
  Net assets, end of
   period, in millions...   $6,450    $7,955    $8,211   $12,235   $12,484   $11,736    $9,829   $10,167   $10,366   $10,418
  Portfolio turnover
   rate..................       8%       14%       26%       32%       40%      104%       54%       44%       15%       51%
</TABLE>
    
 
- -------------
   
+ DOES NOT REFLECT THE  DEDUCTION OF SALES CHARGE.  CALCULATED BASED ON THE  NET
  ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
    
 
                                       4
<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 Dean Witter, Discover  & Co., a balanced
financial services organization providing a  broad range of nationally  marketed
credit and investment products.
 
   
    On  February 5, 1997, DWDC and Morgan Stanley Group Inc. announced that they
had entered into an Agreement and Plan  of Merger, with the combined company  to
be  named Morgan  Stanley, Dean  Witter, Discover &  Co. The  business of Morgan
Stanley Group Inc.  and its affiliated  companies is providing  a wide range  of
financial  services  for sovereign  governments, corporations,  institutions and
individuals throughout the world. DWDC is the direct parent of InterCapital  and
Dean   Witter  Distributors  Inc.,  the  Fund's  distributor.  It  is  currently
anticipated  that   the  transaction   will  close   in  mid-1997.   Thereafter,
InterCapital  and Dean Witter  Distributors Inc. will  be direct subsidiaries of
Morgan Stanley, Dean Witter, Discover & Co.
    
 
   
    InterCapital and its wholly-owned  subsidiary, Dean Witter Services  Company
Inc.,   serve  in  various  investment   management,  advisory,  management  and
administrative capacities  to  102 investment  companies,  thirty of  which  are
listed   on  the  New  York  Stock  Exchange,  with  combined  total  assets  of
approximately $89.8 billion at  February 28, 1997.  The Investment Manager  also
manages  portfolios of pension  plans, other institutions  and individuals which
aggregated approximately $3.2 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, 1996, the Fund  accrued total compensation to the Investment
Manager amounting to 0.42% of the Fund's average daily net assets and the Fund's
total expenses amounted to 1.25% of the Fund's average daily net assets.
    
 
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 "full
 
                                       5
<PAGE>
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 VA-
 
                                       6
<PAGE>
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.
 
    COLLATERALIZED    MORTGAGE    OBLIGATIONS   AND    MULTICLASS   PASS-THROUGH
SECURITIES.  Collateralized
 
                                       7
<PAGE>
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  date. PAC  Bonds  always are
parallel pay  CMOs  with  the  required principal  payment  on  such  securities
 
                                       8
<PAGE>
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 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
 
                                       9
<PAGE>
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 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.
 
    For  additional risk disclosure, please refer  to the discussion of specific
investments above in "Investment Objective and Policies."
 
PORTFOLIO TRADING
 
   
    The Fund is managed within InterCapital's Taxable Fixed-Income Group,  which
manages twenty-five funds and fund portfolios, with approximately $13 billion in
assets  at  February  28,  1997.  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 since July, 1992 and has been managing
    
 
                                       10
<PAGE>
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.
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
    The Fund offers 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 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 minimum initial purchase is $1,000. Subsequent purchases of $100 or more
may be  made  by  sending  a  check, payable  to  Dean  Witter  U.S.  Government
Securities  Trust, directly to Dean Witter  Trust Company (the "Transfer Agent")
at P.O. Box 1040, Jersey City, NJ 07303 or by contacting an account executive of
DWR or other Selected Broker-Dealer. 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.
In the  case  of investments  pursuant  to Systematic  Payroll  Deduction  Plans
(including Individual Retirement Plans), the Fund, in its discretion, may accept
investments  without  regard to  any minimum  amounts  which would  otherwise be
required, if the  Fund 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. The offering price will be the net
asset  value  per  share next  determined  following  receipt of  an  order (see
"Determination of Net Asset Value" below).
 
    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. While no sales charge is imposed at the time shares
are purchased, a contingent deferred sales charge may be imposed at the time  of
redemption  (see "Redemptions and Repurchases"). Sales personnel are compensated
for  selling   shares   of   the  Fund   at   the   time  of   their   sale   by
 
                                       11
<PAGE>
the Distributor and/or 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.
 
PLAN OF DISTRIBUTION
 
    The Fund has adopted  a Plan of Distribution,  pursuant to Rule 12b-1  under
the  Act (the "Plan"), under which the Fund pays the Distributor a fee, which is
accrued daily and payable monthly, at an 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  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 shares redeemed since the  Fund's
inception  upon which  a contingent  deferred sales  charge has  been imposed or
waived, or (b) the Fund's  average daily net assets. The  fee is treated by  the
Fund  as an  expense in the  year it  is accrued. A  portion of  the fee payable
pursuant to the Plan, equal to 0.20% of the Fund's average daily net assets,  is
characterized  as  a service  fee  within the  meaning  of NASD  guidelines. The
service fee is  a payment made  for personal service  and/or the maintenance  of
shareholder accounts.
 
    Amounts paid under the Plan are 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, including the payment of commissions  for
sales  of the Fund's  shares and incentive  compensation to and  expenses of DWR
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  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 distribution expenses.
 
   
    For the fiscal year ended December 31, 1996, the Fund accrued payments under
the  Plan amounting to $53,189,389, which amount is equal to 0.75% of the Fund's
average daily net  assets for the  fiscal year. The  payments accrued under  the
Plan  were calculated pursuant  to clause (b) of  the compensation formula under
the Plan.
    
 
   
    At any given time, the expenses of distributing 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 contingent  deferred sales charges  paid by investors
upon  redemption  of  shares  (see  "Redemptions  and  Repurchases--  Contingent
Deferred  Sales Charge"). For example, if $1 million in expenses in distributing
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  the  excess  distribution  expenses,
including the carrying charge described above, totalled $68,120,003 at  December
31, 1996, which was equal to 1.06% of the Fund's net assets 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, 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
recov-
 
                                       12
<PAGE>
ered through future distribution fees or contingent deferred sales charges.
 
DETERMINATION OF NET ASSET VALUE
 
    The net asset value per share of the Fund is determined by taking the  value
of  all the  assets of  the Fund, subtracting  all liabilities,  dividing by the
number of shares outstanding and adjusting  the result to the nearest cent.  The
net  asset value per share is calculated by the Investment Manager 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 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.
    
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
    AUTOMATIC  INVESTMENT  OF DIVIDENDS  AND DISTRIBUTIONS.   All  dividends and
capital gains distributions are automatically paid in full and fractional shares
of the Fund (or, if specified by the shareholder, any other open-end  investment
company  for which InterCapital serves as investment manager (collectively, with
the Fund, the "Dean Witter Funds")),  unless the shareholder requests that  they
be  paid in  cash. Shares  so acquired are  not subject  to the  imposition of a
contingent deferred sales  charge upon  their redemption  (see "Redemptions  and
Repurchases").  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) 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.
 
    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, on a semi-monthly,
monthly   or  quarterly  basis,   to  the  Transfer   Agent  for  investment  in
 
                                       13
<PAGE>
shares of  the  Fund  (see  "Purchase  of  Fund  Shares"  and  "Redemptions  and
Repurchases--Involuntary Redemption").
 
    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 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  not subject  to the  imposition of  a contingent
deferred sales charge upon their redemption (see "Redemptions and Repurchases.")
 
    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
contingent deferred sales charge  will be imposed on  shares redeemed under  the
Withdrawal  Plan  (See "Redemptions  and Repurchases--Contingent  Deferred Sales
Charge"). 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 contingent deferred sales charge) to the shareholder will
be the designated monthly or quarterly amount.
 
    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.
 
    EXCHANGE PRIVILEGE.    The  Fund  makes available  to  its  shareholders  an
"Exchange  Privilege" allowing the exchange of shares  of the Fund for shares of
other Dean Witter  Funds sold  with a  contingent deferred  sales charge  ("CDSC
funds"),  and for  shares of  Dean Witter  Short-Term U.S.  Treasury Trust, Dean
Witter Limited  Term Municipal  Trust, Dean  Witter Short-Term  Bond Fund,  Dean
Witter  Balanced  Growth Fund,  Dean Witter  Balanced  Income Fund,  Dean Witter
Intermediate Term U.S. Treasury Trust and five Dean Witter Funds which are money
market funds (the foregoing eleven non-CDSC funds are hereinafter referred to as
the "Exchange  Funds"). 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 CDSC  fund 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 CDSC funds  can be effected on  the same basis.  No
contingent  deferred  sales  charge  ("CDSC")  is imposed  at  the  time  of any
exchange, although any applicable CDSC will be imposed upon ultimate redemption.
Shares of the Fund acquired in exchange for shares of another CDSC fund having a
different CDSC schedule  than that  of this  Fund will  be subject  to the  CDSC
schedule  of this  Fund, even  if such  shares are  subsequently reexchanged for
shares of the
 
                                       14
<PAGE>
CDSC fund  originally  purchased. 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 (for the purpose of
determining the rate of  the CDSC) is frozen.  If those shares are  subsequently
reexchanged for shares of a CDSC fund, the holding period previously frozen when
the first exchange was made resumes on the last day of the month in which shares
of a CDSC fund are reacquired. Thus, the CDSC is based upon the time (calculated
as   described  above)  the  shareholder  was  invested  in  a  CDSC  fund  (see
"Redemptions and Repurchases--Contingent  Deferred Sales  Charge"). 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.  (Exchange  Fund  12b-1  distribution  fees  are
described in the prospectuses for those funds.)
 
    In  addition, shares of the  Fund may be acquired  in exchange for shares of
Dean Witter Funds sold  with a front-end sales  charge ("front-end sales  charge
funds"),  but shares  of the  Fund, however acquired,  may not  be exchanged for
shares of  front-end sales  charge funds.  Shares  of a  CDSC fund  acquired  in
exchange  for shares of a front-end sales charge fund (or in exchange for shares
of other Dean Witter  Funds for which  shares of a  front-end sales charge  fund
have been exchanged) are not subject to any CDSC upon their redemption.
 
    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 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
and  any other conditions imposed by each  fund. 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
 
                                       15
<PAGE>
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.
 
    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 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 contingent  deferred sales  charges
(see  below). If shares are  held in a Shareholder  Investment 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.
 
    CONTINGENT DEFERRED SALES CHARGE.  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 charge upon redemption.
Shares redeemed sooner than six years after purchase may, however, be subject to
a charge upon  redemption. This charge  is called a  "contingent deferred  sales
charge"  ("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 table below:
 
<TABLE>
<CAPTION>
                                       CONTINGENT DEFERRED
            YEAR SINCE                     SALES CHARGE
             PURCHASE                   AS A PERCENTAGE OF
           PAYMENT MADE                  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>
 
    A  CDSC will not be imposed on:  (i) any amount which represents an increase
in value of shares
pur-
 
                                       16
<PAGE>
chased within the six years preceding the redemption; (ii) the current net asset
value of shares purchased more than six 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 Dean
Witter  Funds sold with a  front-end sales charge 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, no CDSC will be imposed
on redemptions of  shares which  were purchased  by the  employee benefit  plans
established  by DWR and SPS Transaction Services, Inc. (an affiliate of DWR) for
their employees as qualified under Section 401(k) of the Internal Revenue Code.
 
    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
corporate or self-employed retirement plan qualified under Section 401(k) of the
Internal   Revenue  Code  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 Dean Witter Trust Company or
Dean  Witter Trust FSB, each of which is an affiliate of the Investment Manager,
serves as  Trustee  or  the 401(k)  Support  Services  Group of  DWR  serves  as
recordkeeper  ("Eligible  401(k) Plan"),  provided that  either:   (A)  the plan
continues to  be an  Eligible 401(k)  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.
 
    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, the Distributor,
DWR or  other Selected  Broker-Dealers.  The offer  by  DWR and  other  Selected
Broker-Dealers to repurchase shares may
 
                                       17
<PAGE>
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  thirty  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  at 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 as a result of redemptions  or
repurchases  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 the  shareholder, it  will
notify  the shareholder that the value of the shares is less than the applicable
amount and allow him or  her 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  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.  Also, the  Fund may  at
times  make  payments  from sources  other  than  income or  net  capital gains.
Payments from such sources would, in effect, represent a return of a portion  of
each  shareholder's investment. All, or a portion, of such payments would not be
taxable to shareholders.
 
    All dividends and any capital gains distributions will be paid in additional
Fund  shares  (without   sales  charge)  and   automatically  credited  to   the
shareholder's account without issuance of a share
certifi-
 
                                       18
<PAGE>
cate  unless  the shareholder  requests  in writing  that  all dividends  or all
dividends   and   distributions   be    paid   in   cash.   (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.
 
    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.
 
   
    After  the  end  of  the  calendar  year,  shareholders  will  be  sent full
information on their dividends and capital gains distributions for tax purposes.
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. 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  the Fund  is  computed by  dividing the  Fund's net
investment income over a  30-day period by an  average value (using the  average
number of shares entitled to receive dividends and the net asset value per share
at  the  end  of  the  period), all  in  accordance  with  applicable regulatory
requirements. Such amount is compounded for six months and then annualized for a
twelve-month period to derive the Fund's yield.
 
    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  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
Fund  and all sales  charges which would be  incurred by redeeming 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 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 the contingent deferred 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
 
                                       19
<PAGE>
$100,000  in 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.
 
    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.
 
    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.
 
                                       20
<PAGE>
                        THE DEAN WITTER FAMILY OF FUNDS
 
   
<TABLE>
<S>                                                 <C>
MONEY MARKET FUNDS                                  FIXED-INCOME FUNDS
Dean Witter Liquid Asset Fund Inc.                  Dean Witter High Yield Securities Inc.
Dean Witter Tax-Free Daily Income Trust             Dean Witter Tax-Exempt Securities Trust
Dean Witter New York Municipal Money Market Trust   Dean Witter U.S. Government Securities Trust
Dean Witter California Tax-Free Daily Income Trust  Dean Witter California Tax-Free Income Fund
Dean Witter U.S. Government Money Market Trust      Dean Witter New York Tax-Free Income Fund
EQUITY FUNDS                                        Dean Witter Convertible Securities Trust
Dean Witter American Value Fund                     Dean Witter Federal Securities Trust
Dean Witter Natural Resource Development            Dean Witter World Wide Income Trust
 Securities Inc.                                    Dean Witter Intermediate Income Securities
Dean Witter Dividend Growth Securities Inc.         Dean Witter Global Short-Term Income Fund Inc.
Dean Witter Developing Growth Securities Trust      Dean Witter Multi-State Municipal Series Trust
Dean Witter World Wide Investment Trust             Dean Witter Premier Income Trust
Dean Witter Value-Added Market Series               Dean Witter Short-Term U.S. Treasury Trust
Dean Witter Utilities Fund                          Dean Witter Diversified Income Trust
Dean Witter Precious Metals and Minerals Trust      Dean Witter Limited Term Municipal Trust
Dean Witter Capital Growth Securities               Dean Witter Short-Term Bond Fund
Dean Witter European Growth Fund Inc.               Dean Witter High Income Securities
Dean Witter Pacific Growth Fund Inc.                Dean Witter National Municipal Trust
Dean Witter Health Sciences Trust                   Dean Witter Balanced Income Fund
Dean Witter Global Dividend Growth Securities       Dean Witter Hawaii Municipal Trust
Dean Witter Global Utilities Fund                   Dean Witter Intermediate Term U.S. Treasury
Dean Witter International SmallCap Fund             Trust
Dean Witter Mid-Cap Growth Fund                     DEAN WITTER RETIREMENT SERIES
Dean Witter Balanced Growth Fund                    Liquid Asset Series
Dean Witter Capital Appreciation Fund               U.S. Government Money Market Series
Dean Witter Information Fund                        U.S. Government Securities Series
Dean Witter Special Value Fund                      Intermediate Income Securities Series
Dean Witter Financial Services Trust                American Value Series
Dean Witter Market Leader Trust                     Capital Growth Series
ASSET ALLOCATION FUNDS                              Dividend Growth Series
Dean Witter Strategist Fund                         Strategist Series
Dean Witter Global Asset Allocation Fund            Utilities Series
ACTIVE ASSETS ACCOUNT PROGRAM                       Value-Added Market Series
Active Assets Money Trust                           Global Equity Series
Active Assets Tax-Free Trust
Active Assets Government Securities Trust
Active Assets California Tax-Free Trust
</TABLE>
    
 
<PAGE>
 
   
Dean Witter
U.S. Government Securities Trust
                                    Dean Witter
Two World Trade Center
New York, New York 10048
TRUSTEES                            U.S. Government
Michael Bozic                       Securities
Charles A. Fiumefreddo              Trust
Edwin J. Garn
John R. Haire
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
Dean Witter Trust Company
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.
                                           PROSPECTUS -- MARCH 31, 1997
 
    
<PAGE>
                     (This page left blank intentionally.)
 
                                       21
<PAGE>
                     (This page left blank intentionally.)
 
                                       22
<PAGE>
STATEMENT OF ADDITIONAL INFORMATION
 
   
<TABLE>
<S>                                                                <C>
MARCH 31, 1997                                                        DEAN WITTER
                                                                    U.S. GOVERNMENT
                                                                    SECURITIES TRUST
</TABLE>
    
 
- --------------------------------------------------------------------------------
 
    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 March 31 ,  1997, 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
<PAGE>
TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
   
<TABLE>
<S>                                                                                      <C>
The Fund and its Management............................................................          3
 
Trustees and Officers..................................................................          7
 
Investment Practices and Policies......................................................         12
 
Investment Restrictions................................................................         13
 
Portfolio Transactions and Brokerage...................................................         14
 
The Distributor........................................................................         15
 
Shareholder Services...................................................................         18
 
Redemptions and Repurchases............................................................         22
 
Dividends, Distributions and Taxes.....................................................         25
 
Performance Information................................................................         26
 
Shares of the Fund.....................................................................         27
 
Custodian and Transfer Agent...........................................................         28
 
Independent Accountants................................................................         28
 
Reports to Shareholders................................................................         28
 
Legal Counsel..........................................................................         28
 
Experts................................................................................         28
 
Registration Statement.................................................................         28
 
Report of Independent Accountants......................................................         29
 
Financial Statements -- December 31, 1996..............................................         30
</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 Dean Witter, Discover &  Co. ("DWDC"), 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:
    
 
   
<TABLE>
<C>        <S>
OPEN-END FUNDS
        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 Global Asset Allocation Fund
       20  Dean Witter Global Dividend Growth
            Securities
       21  Dean Witter Global Short-Term Income
            Fund Inc.
       22  Dean Witter Global Utilities Fund
       23  Dean Witter Hawaii Municipal Trust
       24  Dean Witter Health Sciences Trust
       25  Dean Witter High Income Securities
       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 National Municipal Trust
       39  Dean Witter Natural Resource Development
            Securities Inc.
       40  Dean Witter New York Municipal Money
            Market Trust
       41  Dean Witter New York Tax-Free Income
            Fund
       42  Dean Witter Pacific Growth Fund Inc.
       43  Dean Witter Precious Metals and Minerals
            Trust
       44  Dean Witter Premier Income Trust
       45  Dean Witter Retirement Series
       46  Dean Witter Select Dimensions Investment
            Series
</TABLE>
    
 
                                       3
<PAGE>
   
<TABLE>
<C>        <S>
       47  Dean Witter Select Municipal
            Reinvestment Fund
       48  Dean Witter Short-Term Bond Fund
       49  Dean Witter Short-Term U.S. Treasury
            Trust
       50  Dean Witter Special Value Fund
       51  Dean Witter Strategist Fund
       52  Dean Witter Tax-Exempt Securities Trust
       53  Dean Witter Tax-Free Daily Income Trust
       54  Dean Witter U.S. Government Money Market
            Trust
       55  Dean Witter U.S. Government Securities
            Trust
       56  Dean Witter Utilities Fund
       57  Dean Witter Value-Added Market Series
       58  Dean Witter Variable Investment Series
       59  Dean Witter World Wide Income Trust
       60  Dean Witter World Wide Investment Trust
</TABLE>
    
 
   
<TABLE>
<C>        <S>
CLOSED-END FUNDS
        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>
        1  TCW/DW Core Equity Trust
        2  TCW/DW North American Government Income
            Trust
        3  TCW/DW Latin American Growth Fund
        4  TCW/DW Income and Growth Fund
        5  TCW/DW Small Cap Growth Fund
        6  TCW/DW Balanced Fund
        7  TCW/DW Mid-Cap Equity Trust
        8  TCW/DW Global Telecom Trust
        9  TCW/DW Strategic Income Trust
 
CLOSED-END FUNDS
       10  TCW/DW Term Trust 2000
       11  TCW/DW Term Trust 2002
       12  TCW/DW Term Trust 2003
       13  TCW/DW Total Return Trust
       14  TCW/DW Emerging Markets Opportunities
            Trust
</TABLE>
    
 
    InterCapital  also   serves  as:   (i)  sub-adviser   to  Templeton   Global
Opportunities  Trust, an open-end investment  company; (ii) administrator of The
BlackRock Strategic Term Trust Inc., a closed-end investment company; and  (iii)
sub-administrator  of  MassMutual Participation  Investors and  Templeton Global
Governments Income Trust, closed-end investment companies.
 
    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
 
                                       4
<PAGE>
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. The expenses borne by the Fund  include, but are not limited to: fees
pursuant to any  plan of distribution;  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.
 
    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
 
                                       5
<PAGE>
   
exceeding $10 billion but not exceeding $12.5 billion; and 0.30% of that portion
of such daily  net assets exceeding  $12.5 billion. For  the fiscal years  ended
December  31, 1994, 1995  and 1996, the  Fund accrued to  the Investment Manager
total compensation of $40,553,081, $33,295,918 and $29,579,546, 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 October 30, 1992 and
by the shareholders at a Meeting of  Shareholders held on January 12, 1993.  The
Agreement  is substantially identical to a prior investment management agreement
which was initially approved by  the Trustees on April 16,  1984, by DWR as  the
then  sole shareholder of  the Fund on May  1, 1984, and,  as such agreement had
been  amended  to  provide  for  breakpoints  in  the  management  fee,  by  the
shareholders  of the Fund at  a Meeting of Shareholders  held on April 22, 1985.
The Agreement took effect on June 30,  1993 upon the spin-off by Sears,  Roebuck
and  Co. of its remaining shares of DWDC. 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 had an initial term ending April 30, 1994 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. At their meeting
held on April  17, 1996,  the Fund's  Board of  Trustees, including  all of  the
Independent  Trustees, approved  continuation of  the Agreement  until April 30,
1997.
    
 
   
    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.
    
 
                                       6
<PAGE>
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 79 Dean Witter Funds and the 12 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 (56)                        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
6111 Broken Sound Parkway, N.W.           Stores (May,  1991-July,  1995); formerly  variously  Chairman,  Chief
Boca Raton, Florida                       Executive  Officer, and President  and Chief Operating  Officer of the
                                          Sears Merchandise  Group  of  Sears,  Roebuck  and  Co.;  Director  of
                                          Eaglemark  Financial Services, Inc., the United Negro College Fund and
                                          Weirton Steel Corporation.
Charles A. Fiumefreddo* (63)              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 Dean  Witter
                                          Trust  Company  ("DWTC");  Director  and/or  officer  of  various DWDC
                                          subsidiaries; formerly Executive Vice  President and Director of  DWDC
                                          (until February, 1993).
Edwin J. Garn (64)                        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 Chemical 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 Chemical Corporation (since January, 1993); Direc-
                                          tor of  Franklin  Quest  (time  management  systems)  and  John  Alden
                                          Financial  Corp. (health  insurance); Member  of the  board of various
                                          civic and charitable organizations.
John R. Haire (72)                        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  - October,
                                          1989) and Chairman and Chief Executive Officer of Anchor  Corporation,
                                          an  Investment  Adviser (1964-1978);  Director of  Washington National
                                          Corporation (insurance).
</TABLE>
    
 
                                       7
<PAGE>
   
<TABLE>
<CAPTION>
   NAME, AGE, POSITION WITH FUND AND
                ADDRESS                                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ----------------------------------------  ----------------------------------------------------------------------
<S>                                       <C>
Dr. Manuel H. Johnson (48)                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;
Washington, DC                            Director of Greenwich Capital  Markets, Inc. (broker-dealer);  Trustee
                                          of  the Financial Accounting Foundation (oversight organization of the
                                          Financial Accounting Standards Board);  formerly Vice Chairman of  the
                                          Board   of  Governors   of  the  Federal   Reserve  System  (February,
                                          1986-August, 1990)  and  Assistant  Secretary  of  the  U.S.  Treasury
                                          (1982-1986).
Michael E. Nugent (60)                    General   Partner,   Triumph  Capital,   LP.,  a   private  investment
Trustee                                   partnership (since  April,  1988); Director  or  Trustee of  the  Dean
c/o Triumph Capital, L.P.                 Witter  Funds; Trustee of  the TCW/DW Funds;  formerly Vice President,
237 Park Avenue                           Bankers Trust Company and BT Capital Corporation (1984-1988); Director
New York, New York                        of various business organizations.
Philip J. Purcell* (53)                   Chairman of  the Board  of Directors  and Chief  Executive Officer  of
Trustee                                   DWDC,  DWR and Novus  Credit Services Inc.;  Director of InterCapital,
Two World Trade Center                    DWSC and Distributors; Director or  Trustee of the Dean Witter  Funds;
New York, New York                        Director and/or officer of various DWDC subsidiaries.
John L. Schroeder (66)                    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), Chairman and  Chief
Counsel to the Independent Trustees       Investment  Officer  of Axe-Houghton  Management and  the Axe-Houghton
114 West 47th Street                      Funds (April,  1983-June,  1991)  and  President  of  USF&G  Financial
New York, New York                        Services, Inc. (June, 1990-June, 1991).
Barry Fink (42)                           Senior  Vice President (since  March, 1997) and  Secretary and General
Vice President,                           Counsel (since February, 1997) of  InterCapital and DWSC; Senior  Vice
Secretary and General                     President  (since March,  1997) and Assistant  Secretary and Assistant
Counsel                                   General Counsel  (since  February, 1997)  of  Distributors;  Assistant
Two World Trade Center                    Secretary  of DWR (since August,  1996); Vice President, Secretary and
New York, New York                        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.
</TABLE>
    
 
                                       8
<PAGE>
   
<TABLE>
<CAPTION>
   NAME, AGE, POSITION WITH FUND AND
                ADDRESS                                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ----------------------------------------  ----------------------------------------------------------------------
<S>                                       <C>
Rajesh K. Gupta (36)                      Senior Vice President of InterCapital (since May 1991); Vice President
Vice President                            of   various  Dean   Witter  Funds;   previously  Vice   President  of
Two World Trade Center                    InterCapital.
New York, New York
Thomas F. Caloia (51)                     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
<FN>
- ------------
 *Denotes Trustees who are "Interested persons"  of the Fund, as defined in  the
  Act.
</TABLE>
    
 
   
    In  addition, Robert  M. Scanlan, President  and Chief  Operating Officer of
InterCapital and DWSC,  Executive Vice  President of Distributors  and DWTC  and
Director  of  DWTC,  Joseph J.  McAlinden,  Executive Vice  President  and Chief
Investment Officer of InterCapital  and Director of  DWTC, Robert S.  Giambrone,
Senior  Vice President of InterCapital, DWSC, Distributors and DWTC and Director
of DWTC, and Peter  M. Avelar, Jonathan  R. Page and  James F. Willison,  Senior
Vice Presidents of InterCapital, are Vice Presidents of the Fund, and Marilyn K.
Cranney,  First Vice President and Assistant General Counsel of InterCapital and
DWSC, Lou Anne D. McInnis and Ruth Rossi, Vice Presidents and Assistant  General
Counsels of InterCapital and DWSC, and Frank Bruttomesso and Carsten Otto, 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 eight (8) 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  of this Statement  of
Additional  Information, there are a total of 84 Dean Witter Funds, comprised of
127 portfolios. As of  February 28, 1997,  the Dean Witter  Funds had total  net
assets of approximately $84.2 billion and more than five million shareholders.
    
 
   
    Six  Trustees  (75% 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, DWDC.  These
are  the "disinterested" or "independent" Trustees.  The other two Trustees (the
"management Trustees")  are  affiliated  with  InterCapital.  Four  of  the  six
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,  1996,
the  three Committees held a combined  total of sixteen 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
    
 
                                       9
<PAGE>
   
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
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, since  July
1,  1996, 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.
    
 
                                       10
<PAGE>
   
COMPENSATION OF INDEPENDENT TRUSTEES
    
 
   
    The Fund pays each Independent  Trustee an annual fee  of $1,000 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).  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, 1996.
    
 
   
                               FUND COMPENSATION
    
 
   
<TABLE>
<CAPTION>
                                                                   AGGREGATE
                                                                 COMPENSATION
NAME OF INDEPENDENT TRUSTEE                                      FROM THE FUND
- --------------------------------------------------------------  ---------------
<S>                                                             <C>
Michael Bozic.................................................      $1,800
Edwin J. Garn.................................................       1,850
John R. Haire.................................................       3,950
Dr. Manuel H. Johnson.........................................       1,800
Michael E. Nugent.............................................       1,800
John L. Schroeder.............................................       1,800
</TABLE>
    
 
   
    The  following  table  illustrates  the  compensation  paid  to  the  Fund's
Independent  Trustees for the calendar year ended December 31, 1996 for services
to the 82 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, 1996.
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.
    
 
   
           CASH COMPENSATION FROM DEAN WITTER FUNDS AND TCW/DW FUNDS
    
 
   
<TABLE>
<CAPTION>
                                                                   FOR SERVICE AS    FOR SERVICE
                                                                    CHAIRMAN OF          AS          TOTAL CASH
                                                                   COMMITTEES OF     CHAIRMAN OF    COMPENSATION
                               FOR SERVICE                          INDEPENDENT     COMMITTEES OF   FOR SERVICES
                              AS DIRECTOR OR                         DIRECTORS/      INDEPENDENT         TO
                               TRUSTEE AND       FOR SERVICE AS     TRUSTEES AND    TRUSTEES AND       82 DEAN
                             COMMITTEE MEMBER     TRUSTEE AND          AUDIT            AUDIT          WITTER
                                OF 82 DEAN      COMMITTEE MEMBER   COMMITTEES OF    COMMITTEES OF     FUNDS AND
NAME OF                           WITTER          OF 14 TCW/DW     82 DEAN WITTER     14 TCW/DW       14 TCW/DW
INDEPENDENT TRUSTEE               FUNDS              FUNDS             FUNDS            FUNDS           FUNDS
- ---------------------------  ----------------   ----------------   --------------   -------------   -------------
Michael Bozic..............      $138,850           --                 --               --            $138,850
<S>                          <C>                <C>                <C>              <C>             <C>
Edwin J. Garn..............       140,900           --                 --               --             140,900
John R. Haire..............       106,400           $64,283           $195,450        $ 12,187         378,320
Dr. Manuel H. Johnson......       137,100            66,483            --               --             203,583
Michael E. Nugent..........       138,850            64,283            --               --             203,133
John L. Schroeder..........       137,150            69,083            --               --             206,233
</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
    
 
                                       11
<PAGE>
   
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,
1996 and by the  57 Dean Witter  Funds (including the Fund)  for the year  ended
December  31,  1996,  and  the  estimated  retirement  benefits  for  the Fund's
Independent Trustees, to  commence upon their  retirement, from the  Fund as  of
December 31, 1996 and from the 57 Dean Witter Funds as of December 31, 1996.
    
 
   
RETIREMENT BENEFITS FROM THE FUND AND ALL DEAN WITTER FUNDS
    
- --------------------------------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                             FOR ALL ADOPTING FUNDS          RETIREMENT BENEFITS      ESTIMATED ANNUAL
                                     --------------------------------------  ACCRUED AS EXPENSES          BENEFITS
                                          ESTIMATED                                                  UPON RETIREMENT(2)
                                       CREDITED YEARS         ESTIMATED      --------------------  ----------------------
                                        OF SERVICE AT       PERCENTAGE OF                BY ALL      FROM      FROM ALL
                                         RETIREMENT           ELIGIBLE        BY THE    ADOPTING      THE      ADOPTING
NAME OF INDEPENDENT TRUSTEE             (MAXIMUM 10)        COMPENSATION       FUND       FUNDS      FUND        FUNDS
- -----------------------------------  -------------------  -----------------  ---------  ---------  ---------  -----------
<S>                                  <C>                  <C>                <C>        <C>        <C>        <C>
Michael Bozic......................              10               50.0%      $     381  $  20,147  $     950  $    51,325
Edwin J. Garn......................              10               50.0             553     27,772        950       51,325
John R. Haire......................              10               50.0            (282 (3)    46,952     2,343     129,550
Dr. Manuel H. Johnson..............              10               50.0             231     10,926        950       51,325
Michael E. Nugent..................              10               50.0             396     19,217        950       51,325
John L. Schroeder..................               8               41.7             736     38,700        792       42,771
</TABLE>
    
 
- ------------
   
(1)  An Eligible Trustee may  elect alternate payments of  his or her retirement
    benefits based upon the  combined life expectancy  of such Eligible  Trustee
    and his or her spouse on the date of such Eligible Trustee's retirement. The
    amount  estimated to be payable under  this method, through the remainder of
    the later of  the lives of  such Eligible  Trustee and spouse,  will be  the
    actuarial  equivalent  of the  Regular  Benefit. In  addition,  the Eligible
    Trustee may elect that the  surviving spouse's periodic payment of  benefits
    will  be equal  to either 50%  or 100%  of the previous  periodic amount, an
    election that, respectively,  increases or decreases  the previous  periodic
    amount  so that the  resulting payments will be  the actuarial equivalent of
    the Regular Benefit.
    
 
   
(2) Based on  current levels  of compensation.  Amount of  annual benefits  also
    varies depending on the Trustee's elections described in Footnote (1) above.
    
 
   
(3)  This number  reflects the effect  of the  extension of Mr.  Haire's term as
    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
 
                                       12
<PAGE>
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.
 
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.
 
                                       13
<PAGE>
        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.
 
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
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, 1994, 1995 and 1996, 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.
 
    Consistent  with  the  policy  described  above,  brokerage  transactions in
securities listed on exchanges or admitted to unlisted trading privileges may be
effected through DWR. In order for DWR to effect portfolio transactions for  the
Fund,   the   commissions,  fees   or   other  remuneration   received   by  DWR
 
                                       14
<PAGE>
   
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 DWR 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  commissions, fees or other remuneration paid to DWR are consistent with the
foregoing standard. For the fiscal years ended December 31, 1994, 1995 and 1996,
the Fund did not effect any securities transactions with or through DWR.
    
 
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 DWDC. 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   October  30,  1992,  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 had an initial  term ending April 30, 1994, and  will
remain in effect from year to year thereafter if approved by the Board. At their
meeting  held on April 17, 1996, the  Trustees, including all of the Independent
Trustees, approved the  continuation of the  Distribution Agreement until  April
30, 1997.
    
 
    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 and 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 the Fund  pays the Distributor  compensation
accrued  daily and payable monthly at the annual rate of 0.75% (0.65% of amounts
over $10 billion) of the lesser of: (a) the average daily aggregate gross  sales
of   the  Fund's  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 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 contingent deferred sales
charges imposed on certain redemptions of  shares, which are separate and  apart
from  payments made  pursuant to the  Plan (see "Redemptions  and Repurchases --
Contingent Deferred  Sales  Charge"  in the  Prospectus).  The  Distributor  has
informed  the  Fund  that  it  and/or  DWR  received  approximately $23,000,000,
$10,629,000 and $8,964,262 in contingent  deferred sales charges for the  fiscal
years  ended December 31, 1994,  1995 and 1996, respectively,  none of which was
retained by the Distributor.
    
 
                                       15
<PAGE>
    The  Distributor has informed the Fund that a portion of the fees payable by
the Fund each year  pursuant to the  Plan equal to 0.20%  of the Fund's  average
daily  net assets is  characterized as a  "service fee" under  the Rules of Fair
Practice of the National Association of  Securities Dealers, Inc. (of which  the
Distributor is a member). Such portion of the fee is a payment made for personal
service and/or the maintenance of shareholder accounts. The remaining portion of
the  Plan fees  payable by  the Fund is  characterized as  an "asset-based sales
charge" as such is defined by the aforementioned Rules of Fair Practice.
 
    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 Fair
Practice. 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.
 
   
    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. The  Fund accrued amounts
payable to the Distributor under the Plan, during the fiscal year ended December
31, 1996, of $53,189,389. This amount is equal to 0.75% of the average daily net
assets of the Fund for the fiscal year and was calculated pursuant to clause (b)
under the Plan. This amount is treated by the Fund as an expense in the year  it
is accrued.
    
 
    The  Plan was adopted  in order to  permit the implementation  of the Fund's
method of distribution. Under  this distribution method shares  of the Fund  are
sold  without a sales load  being deducted at the time  of purchase, so that the
full amount of an investor's purchase payment will be invested in shares without
any deduction  for  sales charges.  Shares  of the  Fund  may be  subject  to  a
contingent deferred sales charge, payable to the Distributor, if redeemed during
the  six years after  their purchase. DWR compensates  its account executives by
paying them, from its own funds, commissions for the sale of the Fund's  shares,
currently  a gross sales  credit of up  to 4% of  the amount sold  and an annual
residual commission of  up to 0.20  of 1%  of the current  value (not  including
reinvested  dividends and  distributions) of  the amount  sold. 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,
 
                                       16
<PAGE>
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 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, 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 paid 100% of the $53,189,389 accrued under the Plan for the fiscal
year ended  December  31, 1996  to  the  Distributor. The  Distributor  and  DWR
estimate that they have spent, pursuant to the Plan, $1,150,496,391 on behalf of
the  Fund since the inception of the Plan.  It is estimated that this amount was
spent in approximately the following ways: (i) 0.59% ($6,764,961) -- advertising
and promotional expenses;  (ii) 0.12% ($1,386,515)  -- printing of  prospectuses
for   distribution  to  other  than   current  shareholders;  and  (iii)  99.29%
($1,142,344,915) -- other  expenses, including  the gross sales  credit and  the
carrying  charge, of  which 14.97%  ($171,001,978) represents  carrying charges,
34.96% ($399,319,081) represents  commission credits to  DWR branch offices  for
payments   of  commissions  to  account  executives  and  50.07%  ($572,023,856)
represents overhead and other branch office distribution-related expenses.
    
 
    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
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  shares,  totalled $108,126,636  as  of December  31,  1995.
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, 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 remained in effect  until 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 manner described above.  The
most  recent continuance  of the Plan  for one  year, until April  30, 1996, 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 20, 1995. 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    obtained   and   would
 
                                       17
<PAGE>
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
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  discussed in the Prospectus, the net asset  value of a share 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; Presidents' Day; Good
Friday;  Memorial  Day;  Independence  Day;  Labor  Day;  Thanksgiving  Day; and
Christmas Day.
 
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  Fund's
Transfer  Agent, Dean  Witter Trust Company  (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  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  broker-dealer,
and   will  be  forwarded  to  the  shareholder,  upon  the  receipt  of  proper
instructions.
 
    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 an open-end Dean Witter Fund other than Dean
Witter U.S.  Government  Securities  Trust.  Such investment  will  be  made  as
described above for automatic investment in shares of the Fund, at the net asset
value per share of the
 
                                       18
<PAGE>
selected  Dean Witter Fund  as of the  close of business  on the monthly payment
date 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 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, 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.  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 contingent deferred sales charge
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  contingent deferred  sales  charge  will be
imposed on  shares redeemed  under  the Withdrawal  Plan (see  "Redemptions  and
Repurchases--Contingent  Deferred Sales  Charge" 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
contingent  deferred sales  charge) 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.
 
    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 the contingent deferred sales charge applicable to
the  redemption  of  shares  purchased  during  the  preceding  six  years  (see
"Redemptions and Repurchases-- Contingent Deferred Sales Charge").
 
                                       19
<PAGE>
    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. Such amounts 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 the Fund may exchange their shares
for shares of  other Dean  Witter Funds sold  with a  contingent deferred  sales
charge  ("CDSC funds"), and  for shares of Dean  Witter Short-Term U.S. Treasury
Trust, Dean Witter  Limited Term  Municipal Trust, Dean  Witter Short-Term  Bond
Fund,  Dean Witter Balanced Growth Fund,  Dean Witter Balanced Income Fund, Dean
Witter Intermediate Term U.S.  Treasury Trust and five  Dean Witter Funds  which
are  money market  funds (the  foregoing eleven  non-CDSC funds  are hereinafter
referred to as the "Exchange Funds"). 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.
 
    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  captions  "Exchange
Privilege"  and "Contingent Deferred Sales  Charge", a contingent deferred sales
charge ("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  the Fund or  any
other  CDSC fund 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  CDSC fund. However, in the  case of shares of the
Fund 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
 
                                       20
<PAGE>
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  CDSC fund  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 CDSC fund 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 CDSC fund.
 
    In addition, shares of the  Fund may be acquired  in exchange for shares  of
Dean  Witter Funds sold  with a front-end sales  charge ("front-end sales charge
funds"), but shares  of the  Fund, however acquired,  may not  be exchanged  for
shares  of  front-end sales  charge funds.  Shares  of a  CDSC fund  acquired in
exchange for shares of a front-end sales charge fund (or in exchange for  shares
of  other Dean Witter  Funds for which  shares of a  front-end sales charge fund
have been exchanged) are not subject to any CDSC upon their redemption.
 
    When shares initially purchased in a  CDSC fund are exchanged for shares  of
another  CDSC fund, or for  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 t ime of the exchange which were (i) purchased more than 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  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 (all such shares called  "Free
Shares"),  will be  exchanged first. Shares  of Dean Witter  American Value Fund
acquired prior  to  April  30,  1984, shares  of  Dean  Witter  Dividend  Growth
Securities  Inc. and  Dean Witter  Natural Resource  Development Securities Inc.
acquired prior  to July  2, 1984,  and  shares of  Dean Witter  Strategist  Fund
acquired  prior to November 8, 1989, are also considered Free Shares and will be
the first Free Shares to be  exchanged. After an exchange, all dividends  earned
on shares in Dean Witter Short-Term U.S. Treasury Trust or the money market 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 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,  those exchanged non-Free
Shares. Based upon the procedures described in the Prospectus under the  caption
"Contingent Deferred Sales Charge", 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
 
                                       21
<PAGE>
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 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, although  those funds may,  at their  discretion,
accept  initial investments of as low  as $1,000. The minimum initial investment
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 Dean Witter  Special Value Fund  is $5,000.  The
minimum  initial  investment  for 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.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
    REDEMPTION.  As stated in the Prospectus, shares 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
contingent deferred  sales  charges  (see  below).  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
 
                                       22
<PAGE>
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.
    
 
    CONTINGENT DEFERRED SALES CHARGE.  As stated in the Prospectus, a contingent
deferred  sales charge ("CDSC") will be imposed on any redemption by an investor
if after such redemption the current value of the investor's shares of the  Fund
is  less  than the  dollar amount  of all  payments by  the shareholder  for the
purchase of Fund shares during the preceding six 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
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 years. In
addition, no CDSC will be imposed on redemptions of shares which were  purchased
by  the employee benefit plans established  by DWR and SPS Transaction Services,
Inc. (an affiliate of DWR) for their employees as qualified under Section 401(k)
of the Internal Revenue Code. 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 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  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  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 Fund  shares until  the time  of
redemption of such shares. For purposes of
 
                                       23
<PAGE>
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:
 
<TABLE>
<CAPTION>
                                                                                    CONTINGENT DEFERRED
                                                                                      SALES CHARGE AS
                                                                                      A PERCENTAGE OF
YEAR SINCE PURCHASE PAYMENT MADE                                                      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 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 period. This will result in  any such CDSC being imposed at
the  lowest  possible  rate.  Accordingly,  shareholders  may  redeem,   without
incurring  any CDSC,  amounts equal to  any net  increase in the  value of their
shares above the  amount of  their purchase payments  made within  the past  six
years  and amounts equal to the current  value of shares purchased more than six
years prior  to the  redemption  and shares  purchased through  reinvestment  of
dividends  or distributions  or 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.  The CDSC will  be
imposed, in accordance with the table shown above, on any redemptions within six
years of purchase which are in excess of these amounts and which redemptions are
not  (a)  requested  within  one  year  of  death  or  initial  determination of
disability  of  a  shareholder,  or   (b)  made  pursuant  to  certain   taxable
distributions  from retirement plans or retirement accounts, as described in the
Prospectus.
 
    PAYMENT FOR SHARES REDEEMED OR REPURCHASED.  As discussed in the Prospectus,
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. 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. 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  investment 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 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 contingent  deferred sales charge 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
 
                                       24
<PAGE>
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 contingent deferred sales charge
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 thirty 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 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.
 
    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
 
                                       25
<PAGE>
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. 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". The resulting amount is  divided by the product of the
net asset  value per  share on  the last  day of  the period  multiplied by  the
average  number of Fund shares 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. For the 30-day period ended December 31, 1996, the Fund's
yield, calculated pursuant to the formula described above, was 6.11%.
    
 
   
    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 the foregoing. The ending redeemable value is
reduced  by any contingent deferred sales charge 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
the Fund for the year ended December 31, 1996, for the five years ended December
31, 1996 and for the  ten years ended December 31,  1996 were -1.69%, 5.35%  and
6.97%, respectively.
    
 
    In  addition to the foregoing, the Fund  may advertise its total return 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
deduction of the  contingent deferred  sales charge 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 contingent deferred sales charge.
 
                                       26
<PAGE>
   
Based  on this calculation, the average annual total returns of the Fund for the
year ended December 31, 1996, for the five years ended December 31, 1996 and for
the ten years ended December 31, 1996 were 3.16%, 5.65% and 6.97%, respectively.
    
 
   
    In addition, the Fund may compute  its aggregate total return 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  contingent deferred  sales  charge) by  the  initial  $1,000
investment   and  subtracting  1  from  the   result.  Based  on  the  foregoing
calculation, the Fund's total  return for the year  ended December 31, 1996  was
3.16%,  the total return for the five  years ended December 31, 1996 was 31.65%,
and the total return for the ten years ended December 31, 1996 was 96.14%.
    
 
   
    The Fund  may  also advertise  the  growth of  hypothetical  investments  of
$10,000,  $50,000 and $100,000 in  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 $10,000, $50,000
or $100,000.  Investments  of $10,000,  $50,000  and  $100,000 in  the  Fund  at
inception  (June 29, 1984)  would have grown to  $26,827, $134,135 and $268,270,
respectively, at December 31, 1996.
    
 
SHARES OF THE FUND
- --------------------------------------------------------------------------------
 
    The shareholders of the Fund are entitled to a full vote for each full share
held. All of the Trustees, except for Messrs. Bozic, Purcell and Schroeder, have
been elected by the shareholders of the Fund, most recently at a Special Meeting
of Shareholders held on January 12,  1993. Messrs. Bozic, Purcell and  Schroeder
were  elected by the  other Trustees of the  Fund on April 8,  1994. 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 currently authorized
any such additional series or classes of shares.
    
 
    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 shall be  of unlimited duration  subject to the  provisions in the
Declaration of Trust concerning termination by action of the shareholders.
 
                                       27
<PAGE>
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.
 
   
    Dean  Witter Trust Company,  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  investment plans  described herein.  Dean
Witter  Trust  Company 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, Dean Witter Trust
Company'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
Dean Witter Trust Company 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  financial  statements  of  the  Fund  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.
 
                                       28
<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, 1996, 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 ten years in the period then ended, 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, 1996 by correspondence with the
custodian and a broker, provide a reasonable basis for the opinion expressed
above.
 
PRICE WATERHOUSE LLP
1177 AVENUE OF THE AMERICAS
NEW YORK, NEW YORK 10036
FEBRUARY 18, 1997
 
                                       29
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS DECEMBER 31, 1996
 
<TABLE>
<CAPTION>
  PRINCIPAL                          DESCRIPTION
  AMOUNT IN                              AND                              COUPON
  THOUSANDS                         MATURITY DATE                          RATE           VALUE
- -----------------------------------------------------------------------------------------------------
<C>            <S>                                                       <C>        <C>
               MORTGAGE-BACKED SECURITIES (80.5%)
               Government National Mortgage Assoc. I (79.6%)
$     348,269  10/15/22-02/15/24.......................................      6.50 % $     332,053,085
       25,000  (a).....................................................      7.00          24,437,500
    2,194,356  04/15/17-04/15/26.......................................      7.00       2,144,983,431
    1,098,215  11/15/02-06/15/26.......................................      7.50       1,098,557,782
      372,670  10/15/16-07/15/26.......................................      8.00         380,240,075
      390,028  07/15/06-04/15/25.......................................      8.50         404,044,832
      283,195  10/15/08-08/15/21.......................................      9.00         298,239,454
      199,610  10/15/09-12/15/20.......................................      9.50         215,641,679
      214,924  11/15/09-11/15/20.......................................     10.00         235,543,142
          588  04/15/10-06/15/15.......................................     12.50             676,881
                                                                                    -----------------
                                                                                        5,134,417,861
                                                                                    -----------------
               Government National Mortgage Assoc. II (0.7%)
       49,127  01/20/24-02/20/24.......................................      6.50          46,624,166
                                                                                    -----------------
               Government National Mortgage Assoc. GPM I (0.2%)
        9,269  06/15/13-09/15/15.......................................     12.25          10,794,963
                                                                                    -----------------
               TOTAL MORTGAGE-BACKED SECURITIES
               (IDENTIFIED COST $5,168,329,453)...................................      5,191,836,990
                                                                                    -----------------
               U.S. GOVERNMENT OBLIGATIONS (13.4%)
               U.S. Treasury Notes (4.1%)
       29,000  02/28/97................................................      6.875         29,073,370
       42,500  03/31/97................................................      6.875         42,660,650
       75,000  04/15/97................................................      8.50          75,653,250
       58,000  04/30/97................................................      6.875         58,294,640
       55,000  04/15/99................................................      7.00          56,235,850
                                                                                    -----------------
                                                                                          261,917,760
                                                                                    -----------------
               U.S. Treasury Coupon Strips (9.3%)
      123,000  02/15/04................................................      0.00          78,426,030
      380,000  05/15/04................................................      0.00         238,001,600
      385,000  08/15/04................................................      0.00         237,129,200
       75,000  11/15/04................................................      0.00          45,396,750
                                                                                    -----------------
                                                                                          598,953,580
                                                                                    -----------------
               TOTAL U.S. GOVERNMENT OBLIGATIONS
               (IDENTIFIED COST $778,502,738).....................................        860,871,340
                                                                                    -----------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       30
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS DECEMBER 31, 1996, CONTINUED
 
<TABLE>
<CAPTION>
  PRINCIPAL                          DESCRIPTION
  AMOUNT IN                              AND                              COUPON
  THOUSANDS                         MATURITY DATE                          RATE           VALUE
- -----------------------------------------------------------------------------------------------------
<C>            <S>                                                       <C>        <C>
               U.S. GOVERNMENT AGENCIES (6.2%)
               Resolution Funding Corp Zero Coupon Strips
$      33,500  07/15/02................................................      0.00 % $      23,649,660
       10,049  10/15/02................................................      0.00           6,975,614
      109,000  04/15/03................................................      0.00          72,932,990
       55,000  07/15/03................................................      0.00          36,196,600
       69,000  10/15/03................................................      0.00          44,616,090
      123,882  01/15/04................................................      0.00          78,748,072
      104,419  04/15/04................................................      0.00          65,220,107
       80,000  07/15/04................................................      0.00          49,127,200
       40,000  04/15/06................................................      0.00          21,746,800
        5,000  10/15/06................................................      0.00           2,626,900
                                                                                    -----------------
               TOTAL U.S. GOVERNMENT AGENCIES
               (IDENTIFIED COST $365,230,502).....................................        401,840,033
                                                                                    -----------------
TOTAL INVESTMENTS
(IDENTIFIED COST $6,312,062,693) (B)......      100.1%  6,454,548,363
LIABILITIES IN EXCESS OF CASH AND OTHER
ASSETS....................................       (0.1)     (5,010,207)
                                                -----   -------------
NET ASSETS................................      100.0%  $6,449,538,156
                                                -----   -------------
                                                -----   -------------
<FN>
- ---------------------
GPM  Graduated Payment Mortgage.
(a)  Securities purchased on a forward commitment basis with an approximate
     principal amount and no definite maturity date; the actual principal
     amount and maturity date will be determined upon settlement.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $211,958,662 and the
     aggregate gross unrealized depreciation is $69,472,992, resulting in net
     unrealized appreciation of $142,485,670.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       31
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
FINANCIAL STATEMENTS
 
STATEMENT OF ASSETS AND LIABILITIES
DECEMBER 31, 1996
 
<TABLE>
<S>                                                           <C>
ASSETS:
Investments in securities, at value
  (identified cost $6,312,062,693)..........................  $ 6,454,548,363
Cash........................................................          449,209
Receivable for:
    Interest................................................       37,055,157
    Shares of beneficial interest sold......................       13,471,656
Prepaid expenses and other assets...........................          100,149
                                                              ---------------
     TOTAL ASSETS...........................................    6,505,624,534
                                                              ---------------
LIABILITIES:
Payable for:
    Investments purchased...................................       24,730,035
    Dividends to shareholders...............................       18,555,177
    Shares of beneficial interest repurchased...............        5,216,188
    Plan of distribution fee................................        4,283,834
    Investment management fee...............................        2,404,212
Accrued expenses and other payables.........................          896,932
                                                              ---------------
     TOTAL LIABILITIES......................................       56,086,378
                                                              ---------------
NET ASSETS:
Paid-in-capital.............................................    7,598,295,399
Net unrealized appreciation.................................      142,485,670
Dividends in excess of net investment income................           (4,722)
Accumulated net realized loss...............................   (1,291,238,191)
                                                              ---------------
     NET ASSETS.............................................  $ 6,449,538,156
                                                              ---------------
                                                              ---------------
NET ASSET VALUE PER SHARE,
  723,414,184 SHARES OUTSTANDING (UNLIMITED SHARES
  AUTHORIZED OF $.01 PAR VALUE).............................
                                                                        $8.92
                                                              ---------------
                                                              ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       32
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF OPERATIONS
FOR THE YEAR ENDED DECEMBER 31, 1996
 
<TABLE>
<S>                                                           <C>
NET INVESTMENT INCOME:
INTEREST INCOME.............................................  $ 533,679,451
                                                              -------------
EXPENSES
Plan of distribution fee....................................     53,189,389
Investment management fee...................................     29,579,546
Transfer agent fees and expenses............................      4,382,628
Custodian fees..............................................      1,025,583
Shareholder reports and notices.............................        177,325
Professional fees...........................................        107,597
Registration fees...........................................         31,140
Trustees' fees and expenses.................................         22,931
Servicing fees..............................................         19,454
Other.......................................................         68,060
                                                              -------------
     TOTAL EXPENSES.........................................     88,603,653
     LESS EXPENSE OFFSET....................................        (20,817)
                                                              -------------
     NET EXPENSES...........................................     88,582,836
                                                              -------------
     NET INVESTMENT INCOME..................................    445,096,615
                                                              -------------
NET REALIZED AND UNREALIZED LOSS:
Net realized loss...........................................    (18,950,945)
Net change in unrealized appreciation.......................   (237,138,336)
                                                              -------------
     NET LOSS...............................................   (256,089,281)
                                                              -------------
NET INCREASE................................................  $ 189,007,334
                                                              -------------
                                                              -------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       33
<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,
                                                              DECEMBER 31, 1996       1995
- -----------------------------------------------------------------------------------------------
<S>                                                           <C>                 <C>
INCREASE (DECREASE) IN NET ASSETS:
OPERATIONS:
Net investment income.......................................   $    445,096,615   $ 522,928,136
Net realized loss...........................................        (18,950,945)    (77,736,417)
Net change in unrealized appreciation/depreciation..........       (237,138,336)    811,733,423
                                                              -----------------   -------------
     NET INCREASE...........................................        189,007,334   1,256,925,142
Dividends from net investment income........................       (447,472,130)   (522,076,848)
Net decrease from transactions in shares of beneficial
  interest..................................................     (1,246,903,069)   (990,646,568)
                                                              -----------------   -------------
     NET DECREASE...........................................     (1,505,367,865)   (255,798,274)
NET ASSETS:
Beginning of period.........................................      7,954,906,021   8,210,704,295
                                                              -----------------   -------------
     END OF PERIOD
    (INCLUDING DIVIDENDS IN EXCESS OF NET INVESTMENT INCOME
    OF $4,722 AND UNDISTRIBUTED NET INVESTMENT INCOME OF
    $2,370,793, RESPECTIVELY)...............................   $  6,449,538,156   $7,954,906,021
                                                              -----------------   -------------
                                                              -----------------   -------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       34
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1996
 
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.
 
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, 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 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.
 
                                       35
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1996, CONTINUED
 
C. 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.
 
D. 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.
 
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
 
                                       36
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1996, CONTINUED
 
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 pursuant
to which the Fund pays the Distributor compensation, accrued daily and payable
monthly, at an 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 shares
since the Fund's inception (not including reinvestment of dividend or capital
gain distributions) less the average daily aggregate net asset value of the
Fund's 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 Fund's average daily net assets. Amounts paid under the Plan
are paid to the Distributor to compensate it for the services provided and the
expenses borne by it and others in the distribution of the Fund's shares,
including the payment of commissions for sales of the Fund's shares and
incentive compensation to, and expenses of, the account executives of Dean
Witter Reynolds Inc., an affiliate of the Investment Manager and Distributor,
and other employees or selected broker-dealers who engage in or support
distribution of the Fund's 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 be
compensated under the Plan for its opportunity costs in advancing such amounts
which compensation would be in the form of a carrying charge on any unreimbursed
expenses incurred by the Distributor.
 
Provided that the Plan continues in effect, any cumulative expenses incurred by
the Distributor but not yet recovered, may be recovered through future
distribution fees from the Fund and contingent deferred sales charges from the
Fund's shareholders.
 
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, total $68,120,003 at
December 31, 1996.
 
                                       37
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1996, CONTINUED
 
The Distributor has informed the Fund that for the year ended December 31, 1996,
it received approximately $8,964,000 in contingent deferred sales charges from
certain redemptions of the Fund's shares.
 
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, 1996 were $541,075,742
and $1,760,020,882, respectively.
 
Dean Witter Trust Company, an affiliate of the Investment Manager and
Distributor, is the Fund's transfer agent. At December 31, 1996, the Fund had
transfer agent fees and expenses payable of approximately $546,000.
 
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, 1996
included in Trustees' fees and expenses in the Statement of Operations amounted
to $1,285. At December 31, 1996, the Fund had an accrued pension liability of
$50,453 included in accrued expenses in the Statement of Assets and Liabilities.
 
5. SHARES OF BENEFICIAL INTEREST
 
Transactions in shares of beneficial interest were as follows:
 
<TABLE>
<CAPTION>
                                                                        FOR THE YEAR ENDED            FOR THE YEAR ENDED
                                                                        DECEMBER 31, 1996             DECEMBER 31, 1995
                                                                   ----------------------------   --------------------------
                                                                     SHARES          AMOUNT         SHARES         AMOUNT
                                                                   -----------   --------------   -----------   ------------
<S>                                                                <C>           <C>              <C>           <C>
Sold.............................................................   44,291,927   $  394,473,930    48,336,027   $429,525,036
Reinvestment of dividends........................................   25,980,320      230,960,458    30,293,874    269,738,501
                                                                   -----------   --------------   -----------   ------------
                                                                    70,272,247      625,434,388    78,629,901    699,263,537
Repurchased......................................................  (210,573,457) (1,872,337,457)  (190,805,203) (1,689,910,105)
                                                                   -----------   --------------   -----------   ------------
Net decrease.....................................................  (140,301,210) $(1,246,903,069) (112,175,302) $(990,646,568)
                                                                   -----------   --------------   -----------   ------------
                                                                   -----------   --------------   -----------   ------------
</TABLE>
 
                                       38
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1996, CONTINUED
 
6. FEDERAL INCOME TAX STATUS
 
At December 31, 1996, the Fund had a net capital loss carryover 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
  ---------------------------------------------------------------------------------------------------------
    1997        1998        1999        2000        2001        2002        2003        2004        Total
  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
  <S>         <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>
  $ 270,987   $ 108,731   $ 261,525   $ 154,964   $ 263,492   $ 118,056   $  63,667   $  49,143   $1,290,565
  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
</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 $673,000 during fiscal 1996.
 
At December 31, 1996, the Fund had temporary book/tax differences primarily
attributable to post-October losses and a permanent book/tax difference
attributable to an expired capital loss carryover. To reflect reclassifications
arising from permanent book/tax differences for the year ended December 31,
1996, accumulated net realized loss was credited and paid-in-capital was charged
$277,199,313.
 
                                       39
<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
                  ----------------------------------------------------------------------------------------------------------------
                     1996       1995       1994        1993       1992       1991        1990       1989       1988        1987
- ----------------------------------------------------------------------------------------------------------------------------------
 
<S>               <C>         <C>        <C>        <C>         <C>        <C>        <C>         <C>        <C>        <C>
PER SHARE OPERATING
PERFORMANCE:
 
Net asset value,
 beginning of
 period.......... $     9.21  $    8.41  $    9.31  $     9.30  $    9.52  $    9.37  $     9.51  $    9.42  $    9.75  $    10.33
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
 
Net investment
 income..........       0.56       0.57       0.58        0.64       0.74       0.87        0.90       0.91       0.97        0.96
Net realized and
 unrealized gain
 (loss)..........      (0.29)      0.80      (0.90)       0.01      (0.22)      0.15       (0.14)      0.09      (0.33)      (0.58)
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
 
Total from
 investment
 operations......       0.27       1.37      (0.32)       0.65       0.52       1.02        0.76       1.00       0.64        0.38
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
 
Less dividends
 from net
 investment
 income..........      (0.56)     (0.57)     (0.58)      (0.64)     (0.74)     (0.87)      (0.90)     (0.91)     (0.97)      (0.96)
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
 
Net asset value,
 end of period... $     8.92  $    9.21  $    8.41  $     9.31  $    9.30  $    9.52  $     9.37  $    9.51  $    9.42  $     9.75
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
 
TOTAL INVESTMENT
RETURN+..........       3.16%     16.74%     (3.51)%       7.13%      5.76%     11.43%       8.49%     11.10%      6.74%       3.92%
 
RATIOS TO AVERAGE
NET ASSETS:
Expenses.........       1.25%      1.24%      1.22%       1.18%      1.20%      1.17%       1.23%      1.19%      1.21%       1.18%
 
Net investment
 income..........       6.28%      6.44%      6.57%       6.78%      7.91%      9.23%       9.60%      9.62%     10.01%       9.63%
 
SUPPLEMENTAL DATA:
Net assets, end
 of period, in
 millions........     $6,450     $7,955     $8,211     $12,235    $12,484    $11,736      $9,829    $10,167    $10,366     $10,418
 
Portfolio
 turnover rate...          8%        14%        26%         32%        40%       104%         54%        44%        15%         51%
</TABLE>
 
<TABLE>
<C>  <S>
<FN>
 
- ---------------------
 +   Does not reflect the deduction of sales charge. Calculated based on the net
     asset value as of the last business day of the period.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                       40
<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 fiscal years
              ended December 31, 1987, 1988, 1989, 1990,
              1991, 1992, 1993, 1994, 1995 and 1996......................... 4


      (2)   Financial statements included in the Statement of
            Additional Information (Part B):                            Page in
                                                                           SAI
                                                                           ---

              Portfolio of Investments at December 31, 1996.................30

              Statement of assets and liabilities at
              December 31, 1996.............................................32

              Statement of operations for the year
              ended December 31, 1996.......................................33

              Statement of changes in net assets for the years
              ended December 31, 1995 and 1996..............................34

              Notes to Financial Statements ................................35

              Financial highlights for the fiscal years ended
              December 31, 1987, 1988, 1989, 1990, 1991, 1992, 1993,
              1994, 1995 and 1996...........................................40

      (3)   Financial statements included in Part C:

              None

    (b)     EXHIBITS:

              2.    -  Amended and Restated By-Laws of the Registrant
                       dated as of October 25, 1996.

              8.    -  Amendment to the Custodian Agreement between the
                       Registrant and The Bank of New York


                                          1

<PAGE>

              11.   -  Consent of Independent Accountant

              16.   -  Schedules for Computation of Performance
                       Quotations

              27.   - Financial Data Schedule


   ____________________
                 All other exhibits were previously filed 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.

       (1)                                  (2)
                                     Number of Record Holders
    Title of Class                     at February 28, 1997
    --------------                  ------------------------

Shares of Beneficial Interest                    272,167

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


                                          2

<PAGE>

any action or failure to act, except in the case of bad faith, willful
misfeasance, gross negligence or reckless disregard of duties to the Registrant.

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

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

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

Item 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 Dean Witter, Discover & Co.  The principal address of the Dean
Witter Funds is Two World Trade Center, New York, New York 10048.


                                          3

<PAGE>

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

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

OPEN-END INVESTMENT COMPANIES:
 (1) Dean Witter Short-Term Bond Fund
 (2) Dean Witter Tax-Exempt Securities Trust
 (3) Dean Witter Tax-Free Daily Income Trust
 (4) Dean Witter Dividend Growth Securities Inc.
 (5) Dean Witter Convertible Securities Trust
 (6) Dean Witter Liquid Asset Fund Inc.
 (7) Dean Witter Developing Growth Securities Trust
 (8) Dean Witter Retirement Series
 (9) Dean Witter Federal Securities Trust
(10) Dean Witter World Wide Investment Trust
(11) Dean Witter U.S. Government Securities Trust
(12) Dean Witter Select Municipal Reinvestment Fund
(13) Dean Witter High Yield Securities Inc.
(14) Dean Witter Intermediate Income Securities
(15) Dean Witter New York Tax-Free Income Fund
(16) Dean Witter California Tax-Free Income Fund
(17) Dean Witter Health Sciences Trust
(18) Dean Witter California Tax-Free Daily Income Trust
(19) Dean Witter Global Asset Allocation Fund
(20) Dean Witter American Value Fund
(21) Dean Witter Strategist Fund
(22) Dean Witter Utilities Fund


                                          4

<PAGE>

(23) Dean Witter World Wide Income Trust
(24) Dean Witter New York Municipal Money Market Trust
(25) Dean Witter Capital Growth Securities
(26) Dean Witter Precious Metals and Minerals Trust
(27) Dean Witter European Growth Fund Inc.
(28) Dean Witter Global Short-Term Income Fund Inc.
(29) Dean Witter Pacific Growth Fund Inc.
(30) Dean Witter Multi-State Municipal Series Trust
(31) Dean Witter Premier Income Trust
(32) Dean Witter Short-Term U.S. Treasury Trust
(33) Dean Witter Diversified Income Trust
(34) Dean Witter U.S. Government Money Market Trust
(35) Dean Witter Global Dividend Growth Securities
(36) Active Assets California Tax-Free Trust
(37) Dean Witter Natural Resource Development Securities Inc.
(38) Active Assets Government Securities Trust
(39) Active Assets Money Trust
(40) Active Assets Tax-Free Trust
(41) Dean Witter Limited Term Municipal Trust
(42) Dean Witter Variable Investment Series
(43) Dean Witter Value-Added Market Series
(44) Dean Witter Global Utilities Fund
(45) Dean Witter High Income Securities
(46) Dean Witter National Municipal Trust
(47) Dean Witter International SmallCap Fund
(48) Dean Witter Mid-Cap Growth Fund
(49) Dean Witter Select Dimensions Investment Series
(50) Dean Witter Balanced Growth Fund
(51) Dean Witter Balanced Income Fund
(52) Dean Witter Hawaii Municipal Trust
(53) Dean Witter Capital Appreciation Fund
(54) Dean Witter Intermediate Term U.S. Treasury Trust
(55) Dean Witter Information Fund
(56) Dean Witter Japan Fund
(57) Dean Witter Income Builder Fund
(58) Dean Witter Special Value Fund
(59) Dean Witter Financial Services Trust
(60) Dean Witter Market Leader Trust

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

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


                                          5

<PAGE>

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

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 Officer Witter Reynolds Inc. ("DWR"); Chairman, Chief
and Director            Executive Officer and Director of Dean Witter
                        Distributors Inc. ("Distributors") and Dean Witter
                        Services Company Inc. ("DWSC"); Chairman and Director
                        of Dean Witter Trust Company ("DWTC"); 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;
                        Formerly Executive Vice President and Director of Dean
                        Witter, Discover & Co. ("DWDC"); Director and/or
                        officer of various DWDC subsidiaries.


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

Richard M. DeMartini    Executive Vice President of DWDC; President and
Director                Chief Operating Officer of Dean Witter Capital;Director
                        of DWR, DWSC, Distributors and DWTC; Trustee of the
                        TCW/DW Funds; Member (since January, 1993) and Chairman
                        (since January, 1995) of the Board of Directors of
                        NASDAQ.

James F. Higgins        Executive Vice President of DWDC; President and
Director                Chief Operating Officer of Dean Witter Financial;
                        Director of DWR, DWSC, Distributors and DWTC.

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

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


                                          6

<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 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 DWTC; Vice
                        President of the Dean Witter Funds and the TCW/DW
                        Funds.

John Van Heuvelen       President, Chief Operating Officer and Director
Executive Vice          of DWTC.
President

Joseph J. McAlinden
Executive Vice President
and Chief Investment
Office                  Vice President of the Dean Witter Funds and Director of
                        DWTC.

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
Senior Vice President   Vice President of various Dean Witter Funds.

Mark Bavoso
Senior Vice President   Vice President of various Dean Witter Funds.

Richard Felegy
Senior Vice President

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

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

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

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

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

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

John B. Kemp, III       Director of the Provident Savings Bank, Jersey
Senior Vice President   City, New Jersey.

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


                                          7

<PAGE>

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

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

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

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

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


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

Elizabeth A. Vetell
Senior Vice President

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

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

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.

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.

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.

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

Robert Zimmerman
First Vice President

Joan Allman
Vice President


                                          8

<PAGE>

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

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

Kirk Balzer
Vice President          Vice President of Various Dean Witter Funds.

Douglas Brown
Vice President

Philip Casparius
Vice President

Thomas Chronert
Vice President


Rosalie Clough
Vice President

Patricia A. Cuddy
Vice President          Vice President of various Dean Witter Funds.

B. Catherine Connelly
Vice President

Salvatore DeSteno
Vice President          Vice President of DWSC.

Frank J. DeVito
Vice President          Vice President of DWSC.

Bruce Dunn
Vice President

Jeffrey D. Geffen
Vice President

Deborah Genovese
Vice President

Peter W. Gurman
Vice President

John Hechtlinger
Vice President

Peter Hermann
Vice President          Vice President of various Dean Witter Funds


                                          9

<PAGE>

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

Elizabeth Hinchman
Vice President

David Hoffman
Vice President

David Johnson
Vice President

Christopher Jones
Vice President


James Kastberg
Vice President

Stanley Kapica
Vice President

Michael Knox
Vice President          Vice President of various Dean Witter Funds

Konrad J. Krill
Vice President          Vice President of various Dean Witter Funds.

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

Thomas Lawlor
Vice President

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

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.

Sharon K. Milligan
Vice President

Julie Morrone
Vice President

David Myers
Vice President

James Nash
Vice President


                                          10

<PAGE>

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

Richard Norris
Vice President

Anne Pickrell
Vice President          Vice President of Dean Witter Global Short-Term Income
                        Fund Inc.
Hugh Rose
Vice President

Robert Rossetti         Vice President of Dean Witter Precious Metals
Vice President          and 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

Rafael Scolari
Vice President          Vice President of Prime Income Trust

Peter Seeley            Vice President of Dean Witter World
Vice President          Wide Income Trust

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

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

Vinh Q. Tran
Vice President          Vice President of various Dean Witter Funds.

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

Katherine Wickham
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)            Dean Witter Liquid Asset Fund Inc.
 (2)            Dean Witter Tax-Free Daily Income Trust
 (3)            Dean Witter California Tax-Free Daily Income Trust

                                          11

<PAGE>

 (4)            Dean Witter Retirement Series
 (5)            Dean Witter Dividend Growth Securities Inc.
 (6)            Dean Witter Natural Resource Development Securities Inc.
 (7)            Dean Witter World Wide Investment Trust
 (8)            Dean Witter Capital Growth Securities
 (9)            Dean Witter Convertible Securities Trust
(10)            Active Assets Tax-Free Trust
(11)            Active Assets Money Trust
(12)            Active Assets California Tax-Free Trust
(13)            Active Assets Government Securities Trust
(14)            Dean Witter Global Utilities Fund
(15)            Dean Witter Federal Securities Trust
(16)            Dean Witter U.S. Government Securities Trust
(17)            Dean Witter High Yield Securities Inc.
(18)            Dean Witter New York Tax-Free Income Fund
(19)            Dean Witter Tax-Exempt Securities Trust
(20)            Dean Witter California Tax-Free Income Fund
(21)            Dean Witter Limited Term Municipal Trust
(22)            Dean Witter World Wide Income Trust
(23)            Dean Witter Utilities Fund
(24)            Dean Witter Strategist Fund
(25)            Dean Witter New York Municipal Money Market Trust
(26)            Dean Witter Intermediate Income Securities
(27)            Prime Income Trust
(28)            Dean Witter European Growth Fund Inc.
(29)            Dean Witter Developing Growth Securities Trust
(30)            Dean Witter Precious Metals and Minerals Trust
(31)            Dean Witter Pacific Growth Fund Inc.
(32)            Dean Witter Multi-State Municipal Series Trust
(33)            Dean Witter Premier Income Trust
(34)            Dean Witter Short-Term U.S. Treasury Trust
(35)            Dean Witter Diversified Income Trust
(36)            Dean Witter Health Sciences Trust
(37)            Dean Witter Global Dividend Growth Securities
(38)            Dean Witter American Value Fund
(39)            Dean Witter U.S. Government Money Market Trust
(40)            Dean Witter Global Short-Term Income Fund Inc.
(41)            Dean Witter Variable Investment Series
(42)            Dean Witter Value-Added Market Series
(43)            Dean Witter Short-Term Bond Fund
(44)            Dean Witter National Municipal Trust
(45)            Dean Witter High Income Securities
(46)            Dean Witter International SmallCap Fund
(47)            Dean Witter Hawaii Municipal Trust
(48)            Dean Witter Balanced Growth Fund
(49)            Dean Witter Balanced Income Fund
(50)            Dean Witter Intermediate Term U.S. Treasury Trust
(51)            Dean Witter Global Asset Allocation Fund
(52)            Dean Witter Mid-Cap Growth Fund
(53)            Dean Witter Capital Appreciation Fund
(54)            Dean Witter Intermediate Term U.S. Treasury Trust
(55)            Dean Witter Information Fund
(56)            Dean Witter Japan Fund
(57)            Dean Witter Income Builder Fund
(58)            Dean Witter Special Value Fund
(59)            Dean Witter Financial Services Trust
(60)            Dean Witter Market Leader Trust
 (1)            TCW/DW Core Equity Trust
 (2)            TCW/DW North American Government Income Trust
 (3)            TCW/DW Latin American Growth Fund
 (4)            TCW/DW Income and Growth Fund
 (5)            TCW/DW Small Cap Growth Fund
 (6)            TCW/DW Balanced Fund
 (7)            TCW/DW Total Return Trust
 (8)            TCW/DW Mid-Cap Equity Trust
 (9)            TCW/DW Global Telecom Trust
 (10)           TCW/DW Strategic Income Trust


                                          12

<PAGE>


    (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.




                                        Positions and
                                        Office with
    Name                                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.


                                          13

<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 27th day of March, 1997.

                                    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. 14 has been signed below by the following persons
in the capacities and on the dates indicated.

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

(1) Principal Executive Officer         President, Chief
                                        Executive Officer,
                                        Trustee and Chairman
By  /s/ Charles A. Fiumefreddo                                    03/27/97
    ----------------------------
        Charles A. Fiumefreddo

(2) Principal Financial Officer         Treasurer and Principal
                                        Accounting Officer

By  /s/ Thomas F. Caloia                                          03/27/97
    ----------------------------
        Thomas F. Caloia

(3) Majority of the Trustees

    Charles A. Fiumefreddo (Chairman)
    Philip J. Purcell

By  /s/ Barry Fink                                                03/27/97
    ----------------------------
        Barry Fink
        Attorney-in-Fact


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


By  /s/ David M. Butowsky                                         03/27/97
    ----------------------------
        David M. Butowsky
        Attorney-in-Fact
<PAGE>

                     DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST

                                    EXHIBIT INDEX


2.   -   Amended and Restated By-Laws of the Registrant dated as of October 25,
         1996

8.   -   Amendment to the Custodian Agreement between the Registrant and The
         Bank of New York

11.  -   Consent of Independent Accountant

16.  -   Schedules for Computation of Performance Quotations

27.  -   Financial Data Schedule

___________________________________
All other exhibits were previously filed and are hereby incorporated by
reference.

<PAGE>



                                   BY-LAWS

                                      OF

                 DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
                 AMENDED AND RESTATED AS OF OCTOBER 25, 1996

                                  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


<PAGE>

Shareholders present or represented by proxy and entitled to vote thereat
shall have power to adjourn the meeting from time to time. Any adjourned
meeting may be held as adjourned without further notice. At any adjourned
meeting at which a quorum shall be present, any business may be transacted as
if the meeting had been held 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.

                                  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.


                                          2

<PAGE>

   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 (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.


                                          3

<PAGE>

   (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--

          (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


                                          4

<PAGE>

        (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.

   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.


                                          5

<PAGE>

   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.

   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.


                                          6

<PAGE>

   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.

   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


                                          7

<PAGE>

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;

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.


                                          8

<PAGE>

                                  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 Shareholders entitled to notice
of, or to vote at, any meeting of Shareholders, or Shareholders entitled to
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. Such
date, in any case, shall be not more than ninety (90) days, and in case of a
meeting of Shareholders not less than ten (10) days, prior to the date on
which particular action requiring such determination of Shareholders is to be
taken. 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 such 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.

   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,


                                          9

<PAGE>

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>

                                                                    Exhibit 99.8



                         AMENDMENT TO CUSTODY AGREEMENT

     Amendment made as of this 17th day of April, 1996 by and between Dean
Witter U.S. Government Securities Trust (the "Fund") and The Bank of New York
(the "Custodian") to the Custody Agreement between the Fund and the Custodian
dated September 20, 1991 (the "Custody Agreement").  The Custody Agreement is
hereby amended as follows:

     Article XV Section 8 of the Custody Agreement shall be deleted and be
replaced by Sections 8.(a), 8.(b) and 8.(c) as set forth below:

     "8.  (a)  The Custodian will use reasonable care with respect to its
obligations under this Agreement and the safekeeping of Securities and moneys
owned by the Fund.  The Custodian shall indemnify the Fund against and save the
Fund harmless from all liability, claims, losses and demands whatsoever,
including attorneys' fees, howsoever arising or incurred as the result of the
failure of a subcustodian which is a banking institution located in a foreign
country and identified on Schedule A attached hereto and as amended from time to
time upon mutual agreement of the parties (each, a "Subcustodian") to exercise
reasonable care with respect to the safekeeping of such Securities and moneys to
the same extent that the Custodian would be liable to the Fund if the Custodian
were holding such securities and moneys in New York.  In the event of any loss
to the Fund by reason of the failure of the Custodian or a Subcustodian to
utilize reasonable care, the Custodian shall be liable to the Fund only to the
extent of the Fund's direct damages, to be determined based on the market value
of the Securities and moneys which are the subject of the loss at the date of
discovery of such loss and without reference to any special conditions or
circumstances.

     8.   (b)  The Custodian shall not be liable for any loss which results from
(i) the general risk of investing, or (ii) investing or holding Securities and
moneys in a particular country including, but not limited to, losses resulting
from nationalization, expropriation or other governmental actions; regulation of
the banking or securities industry; currency restrictions, devaluations or
fluctuations; or market conditions which prevent the orderly execution of
securities transactions or affect the value of Securities or moneys.

     8.   (c)  Neither party shall be liable to the other for any loss due to
forces beyond its control including, but not limited to, strikes or work
stoppages, acts of war or terrorism, insurrection, revolution, nuclear fusion,
fission or radiation, or acts of God."

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed by their respective Officers, thereunto duly authorized and their
respective seals to be hereunto affixed, as of the day and year first above
written.

                              DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST

[SEAL]                                       By:  /s/ David A. Hughey
                                                  ------------------------------

Attest:

/s/ Robert M. Scanlan
- ------------------------------

                                             THE BANK OF NEW YORK

[SEAL]                                       By:  /s/ S. Grunston
                                                  ------------------------------

Attest:

/s/ Vincent M. Blazewicz
- ------------------------------

<PAGE>

                                   SCHEDULE A


COUNTRY/MARKET                     SUBCUSTODIAN
- --------------                     ------------

Argentina                          The Bank of Boston
Australia                          ANZ Banking Group Limited
Austria                            Girocredit Bank AG
Bangladesh*                        Standard Chartered Bank
Belgium                            Banque Bruxelles Lambert
Botswana*                          Stanbic Bank Botswana Ltd.
Brazil                             The Bank of Boston
Canada                             Royal Trust/Royal Bank of Canada
Chile                              The Bank of Boston/Banco de Chile
China                              Standard Chartered Bank
Columbia                           Citibank, N.A.
Denmark                            Den Danske Bank
Euromarket                         CEDEL
                                   Euroclear
                                   First Chicago Clearing Centre
Finland                            Union Bank of Finland
France                             Banque Paribas/Credit Commercial de France
Germany                            Dresdner Bank A.G.
Ghana*                             Merchant Bank Ghana Ltd.
Greece                             Alpha Credit Bank
Hong Kong                          Hong Kong and Shanghai Banking Corp.
Indonesia                          Hong Kong and Shanghai Banking Corp.
Ireland                            Allied Irish Bank
Israel                             Israel Discount Bank
Italy                              Banca Commerciale Italiana
Japan                              Yasuda Trust & Banking Co., Lt.
Korea                              Bank of Seoul
Luxembourg                         Kredietbank S.A.
Malaysia                           Hong Kong Bank Malaysia Berhad
Mexico                             Banco Nacional de Mexico (Banamex)
Netherlands                        Mees Pierson
New Zealand                        ANZ Banking Group Limited
Norway                             Den Norske Bank
Pakistan                           Standard Chartered Bank
Peru                               Citibank, N.A.
Philippines                        Hong Kong and Shanghai Banking Corp.
Poland                             Bank Handlowy w Warsawie
Portugal                           Banco Comercial Portugues
Singapore                          United Overseas Bank
South Africa                       Standard Bank of South Africa Limited
Spain                              Banco Bilbao Vizcaya
Sri Lanka                          Standard Chartered Bank

<PAGE>

                                   SCHEDULE A


COUNTRY/MARKET                     SUBCUSTODIAN
- --------------                     ------------

Sweden                             Skandianaviska Enskilda Banken
Switzerland                        Union Bank of Switerzland
Taiwan                             Hong Kong and Shanghai Banking Corp.
Thailand                           Siam Commercial Bank
Turkey                             Citibank, N.A.
United Kingdom                     The Bank of New York
United States                      The Bank of New York
Uruguay                            The Bank of Boston
Venezuela                          Citibank N.A.
Zimbabwe*                          Stanbic Bank Zimbabwe Ltd.





*Not yet 17(f)5 compliant

<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. 14 to the registration 
statement on Form N-1A (the "Registration Statement") of our report dated 
February 18, 1997, relating to the financial statements and financial highlights
of Dean Witter U.S. 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 "Experts" and
"Independent Accountants" 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
March 24, 1997








<PAGE>

                          DW US GOVERNMENT SECURITIES TRUST

                      SCHEDULE OF COMPUTATION OF YIELD QUOTATION

                                  DECEMBER 31, 1996


                             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 during the 
                   period that were entitled to receive dividends
               d = The maximum offering price per share on the last
                   day of the period


                                                                         6
YIELD = 2 { [ ((39,316,603.32 - 6,716,144.37) /726,454,284.389 X 8.92) +1] -1}

                                      = 6.11%

<PAGE>

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


(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

                                                                 (A)
  $1,000             ERV AS OF            NUMBER OF             AVERAGE ANNUAL
INVESTED - P         31-Dec-96            YEARS - n             TOTAL RETURN - T
- ------------         ---------            ---------             ----------------

   31-Dec-95          $983.10                   1                       (1.69%)

   31-Dec-91        $1,297.80                   5                        5.35%

   31-Dec-86        $1,961.40                  10                        6.97%




(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-96      RETURN - TR        YEARS - n      TOTAL RETURN - t
- ------------         ---------      -----------        ----------     ----------------
<S>                  <C>            <C>                <C>            <C>
  31-Dec-95         $1,031.60           3.16%                  1                3.16%

  31-Dec-91         $1,316.50          31.65%                  5                5.65%

  31-Dec-86         $1,961.40          96.14%                 10                6.97%

</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             168.27                  $26,827                 $134,135                  $268,270

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                    6,312,062,693
<INVESTMENTS-AT-VALUE>                   6,454,548,363
<RECEIVABLES>                               50,526,813
<ASSETS-OTHER>                                 549,358
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           6,505,624,534
<PAYABLE-FOR-SECURITIES>                    24,730,035
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                   31,356,343
<TOTAL-LIABILITIES>                         56,086,378
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 7,598,295,399
<SHARES-COMMON-STOCK>                      723,414,184
<SHARES-COMMON-PRIOR>                      863,715,394
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         (4,722)
<ACCUMULATED-NET-GAINS>                (1,291,238,191)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   142,485,670
<NET-ASSETS>                             6,449,538,156
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                          533,679,451
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              88,582,836
<NET-INVESTMENT-INCOME>                    445,096,615
<REALIZED-GAINS-CURRENT>                  (18,950,945)
<APPREC-INCREASE-CURRENT>                (237,138,336)
<NET-CHANGE-FROM-OPS>                      189,007,334
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                (447,472,130)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                          (4,722)
<NUMBER-OF-SHARES-SOLD>                   (44,291,927)
<NUMBER-OF-SHARES-REDEEMED>                210,573,457
<SHARES-REINVESTED>                         25,980,320
<NET-CHANGE-IN-ASSETS>                 (1,505,367,865)
<ACCUMULATED-NII-PRIOR>                      2,370,793
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       29,579,546
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             88,582,836
<AVERAGE-NET-ASSETS>                     7,091,893,920
<PER-SHARE-NAV-BEGIN>                             9.21
<PER-SHARE-NII>                                   0.56
<PER-SHARE-GAIN-APPREC>                         (0.29)
<PER-SHARE-DIVIDEND>                            (0.56)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               8.92
<EXPENSE-RATIO>                                   1.25
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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