WITTER DEAN TAX EXEMPT SECURITIES TRUST
485BPOS, 1998-04-17
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<PAGE>
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 17, 1998 
                                                    REGISTRATION NOS.: 2-66268 
                                                                      811-2979 
===============================================================================
                      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. 21                    [X]

                                    AND/OR 

             REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY 

                                  ACT OF 1940                              [X]

                                AMENDMENT NO. 22                           [X]

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

                   DEAN WITTER TAX-EXEMPT SECURITIES TRUST 

                       (A MASSACHUSETTS BUSINESS TRUST) 
              (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER) 

                            TWO WORLD TRADE CENTER 
                           NEW YORK, NEW YORK 10048 

                   (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE) 

      REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (212) 392-1600 

                               BARRY FINK, ESQ. 
                            TWO WORLD TRADE CENTER 
                           NEW YORK, NEW YORK 10048 

                   (NAME AND ADDRESS OF AGENT FOR SERVICE) 

                                   COPY TO: 

                           DAVID M. BUTOWSKY, ESQ. 
                            GORDON ALTMAN BUTOWSKY 
                            WEITZEN SHALOV & WEIN 
                             114 WEST 47TH STREET 
                           NEW YORK, NEW YORK 10036 

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

                APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING: 

As soon as practicable after this Post-Effective Amendment becomes effective. 

IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE (CHECK APPROPRIATE BOX) 

              X  immediately upon filing pursuant to paragraph (b) 
           -----
                 on (date) pursuant to paragraph (b) 
           -----
                 60 days after filing pursuant to paragraph (a) 
           -----
                 on (date) pursuant to paragraph (a) of rule 485. 
           -----

          AMENDING THE PROSPECTUS AND UPDATING FINANCIAL STATEMENTS 

===============================================================================
<PAGE>
                   DEAN WITTER TAX-EXEMPT SECURITIES TRUST 

                            CROSS-REFERENCE SHEET 

<TABLE>

<S>               <C>
FORM N-1A 
ITEM              CAPTION 
- ----              -------
PART A            PROSPECTUS 
- ------            ----------
  1.      .....   Cover Page 
  2.      .....   Prospectus Summary; Summary of Fund Expenses 
  3.      .....   Financial Highlights; Performance Information 
                  Investment Objective and Policies; Risk 
                   Considerations; The Fund and its Management; Cover 
  4.      .....    Page; Investment Restrictions; Prospectus Summary 
                  The Fund and Its Management; Back Cover; Investment 
  5.      .....    Objective and Policies 
                  Dividends, Distributions and Taxes; Additional 
  6.      .....    Information 
  7.      .....   Purchase of Fund Shares; Shareholder Services 
                  Purchase of Fund Shares; Redemptions and Repurchases; 
  8.      .....    Shareholder Services 
  9.      .....   Not Applicable 

PART B            STATEMENT OF ADDITIONAL INFORMATION 
 10.      .....   Cover Page 
 11.      .....   Table of Contents 
 12.      .....   The Fund and Its Management 
                  Investment Practices and Policies; Investment 
 13.      .....    Restrictions; Portfolio Transactions and Brokerage 
 14.      .....   The Fund and Its Management; Trustees and Officers 
 15.      .....   Trustees and Officers 
                  The Fund and Its Management; The Distributor; 
                   Shareholder Services; Custodian and Transfer Agent; 
 16.      .....    Independent Accountants 
 17.      .....   Portfolio Transactions and Brokerage 
 18.      .....   Shares of the Fund 
                  The Distributor; Purchase of Fund Shares; Redemptions 
                   and Repurchases; Financial Statements; Shareholder 
 19.      .....    Services 
                  Dividends, Distributions and Taxes; Performance 
 20.      .....    Information 
 21.      .....   Purchase of Fund Shares 
 22.      .....   Not applicable 
                  Experts; Financial Statements 
 23.      .....    
</TABLE>       

PART C 

   Information required to be included in Part C is set forth under the 
appropriate item, so numbered, in Part C of this Registration Statement. 

<PAGE>

   
             PROSPECTUS 
             APRIL 17, 1998 
    

   Dean Witter Tax-Exempt Securities Trust (the "Fund") is an open-end, 
diversified management investment company, whose investment objective is to 
provide a high level of current income exempt from federal income tax, 
consistent with the preservation of capital. The Fund invests principally in 
tax-exempt fixed-income securities which are rated in the three highest 
categories by Moody's Investors Service, Inc. or Standard & Poor's 
Corporation. (See "Investment Objective and Policies.") 

   
   The Fund offers four classes of shares (each, a "Class"), each with a 
different combination of sales charges, ongoing fees and other features. The 
different distribution arrangements permit an investor to choose the method 
of purchasing shares that the investor believes is most beneficial given the 
amount of the purchase, the length of time the investor expects to hold the 
shares and other relevant circumstances. (See "Purchase of Fund 
Shares--Alternative Purchase Arrangements.") 

             This Prospectus sets forth concisely the information you should 
know before investing in the Fund. It should be read and retained for future 
reference. Additional information about the Fund is contained in the 
Statement of Additional Information, dated April 17, 1998, which has been 
filed with the Securities and Exchange Commission, and which is available at 
no charge upon request of the Fund at the address or telephone numbers listed 
on this page. The Statement of Additional Information is incorporated herein 
by reference. 
    

             Dean Witter 
             Tax-Exempt Securities Trust 
             Two World Trade Center 
             New York, New York 10048 
             (212) 392-2550 or 
             (800) 869-NEWS (toll-free) 

             TABLE OF CONTENTS 

   
Prospectus Summary/  2 
Summary of Fund Expenses/  4 
Financial Highlights/  6 
The Fund and its Management/  9 
Investment Objective and Policies/  9 
 Risk Considerations and Investment Practices/  12 
Investment Restrictions/  15 
Purchase of Fund Shares/  16 
Shareholder Services/  26 
Redemptions and Repurchases/  29 
Dividends, Distributions and Taxes/  30 
Performance Information/  32 
Additional Information/  33 
    

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 DISTRIBUTORS INC. 
             DISTRIBUTOR 


<PAGE>
PROSPECTUS SUMMARY 
- ----------------------------------------------------------------------------- 

   
<TABLE>
<CAPTION>
<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 principally in investment grade, 
                     tax-exempt fixed-income securities (see page 9). 
- ---------------------------------------------------------------------------------------------------------------------------
Shares               Shares of beneficial interest with $0.01 par value (see page 33). The Fund offers four Classes 
Offered              of shares, each with a different combination of sales charges, ongoing fees and other features 
                     (see pages 16-25). 
- ---------------------------------------------------------------------------------------------------------------------------
Minimum              The minimum initial investment for each Class is $1,000 ($100 if the account is opened through 
Purchase             EasyInvest (Service Mark) ). Class D shares are only available to persons investing $5 million 
                     or more and to certain other limited categories of investors. For the purpose of meeting the minimum 
                     $5 million investment for Class D shares, and subject to the $1,000 minimum initial investment 
                     for each Class of the Fund, an investor's existing holdings of Class A shares and shares of funds 
                     for which Dean Witter InterCapital Inc. serves as investment manager ("Dean Witter Funds") that 
                     are sold with a front-end sales charge, and concurrent investments in Class D shares of the Fund 
                     and other Dean Witter Funds that are multiple class funds, will be aggregated. The minimum subsequent 
                     investment is $100 (see page 16). 
- ---------------------------------------------------------------------------------------------------------------------------
Investment           The investment objective of the Fund is to provide a high level of current income exempt from 
Objective            federal income tax, consistent with the preservation of capital (see page 9). 
- ---------------------------------------------------------------------------------------------------------------------------
Investment           Dean Witter InterCapital Inc. ("InterCapital"), the Investment Manager of the Fund, and its wholly-owned 
Manager              subsidiary, Dean Witter Services Company Inc., serve in various investment management, advisory, 
                     management and administrative capacities to 101 investment companies and other portfolios with 
                     assets of approximately $113.6 billion at March 31, 1998 (see page 9). 
- ---------------------------------------------------------------------------------------------------------------------------
Management Fee       The monthly fee is at an annual rate of 1/2 of 1% of average daily net assets, scaled down on 
                     assets over $500 million (see page 9). 
- ---------------------------------------------------------------------------------------------------------------------------
Distributor and      Dean Witter Distributors Inc. (the "Distributor"). The Fund has adopted a distribution plan pursuant 
Distribution         to Rule 12b-1 under the Investment Company Act (the "12b-1 Plan") with respect to the distribution 
Fee                  fees paid by the Class A, Class B and Class C shares of the Fund to the Distributor. The entire 
                     12b-1 fee payable by Class A and a portion of the 12b-1 fee payable by each of Class B and Class 
                     C equal to 0.15% of the average daily net assets of Class B and 0.25% of the average daily net 
                     assets of Class C are currently each characterized as a service fee within the meaning of the 
                     National Association of Securities Dealers, Inc. guidelines. The remaining portion of the 12b-1 
                     fee, if any, is characterized as an asset-based sales charge (see pages 16 and 24). 
- ---------------------------------------------------------------------------------------------------------------------------
Alternative          Four classes of shares are offered: 
Purchase             o Class A shares are offered with a front-end sales charge, starting at 4.25% and reduced for 
Arrangements         larger purchases. Investments of $1 million or more (and investments by certain other limited 
                     categories of investors) are not subject to any sales charge at the time of purchase but a contingent 
                     deferred sales charge ("CDSC") of 1.0% may be imposed on redemptions within one year of purchase. 
                     The Fund is authorized to reimburse the Distributor for specific expenses incurred in promoting 
                     the distribution of the Fund's Class A shares and servicing shareholder accounts pursuant to the 
                     Fund's 12b-1 Plan. Reimbursement may in no event exceed an amount equal to payments at an annual 
                     rate of 0.25% of average daily net assets of the Class (see pages 16, 19 and 24). 
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>
    

                                2           
<PAGE>
- ----------------------------------------------------------------------------- 

   
<TABLE>
<CAPTION>
<S>                <C>
- ---------------------------------------------------------------------------------------------------------------------------
                   o Class B shares are offered without a front-end sales charge, but will in most cases be subject to a 
                   CDSC (scaled down from 5.0% to 1.0%) if redeemed within six years after purchase. The CDSC will be imposed 
                   on any redemption of shares if after such redemption the aggregate current value of a Class B account 
                   with the Fund falls below the aggregate amount of the investor's purchase payments made during the six 
                   years preceding the redemption. Class B shares are also subject to a 12b-1 fee assessed at the annual 
                   rate of 0.60% of the average daily net assets of Class B. Class B shares convert to Class A shares 
                   approximately ten years after the date of the original purchase (see pages 16, 21 and 24). 

                   o Class C shares are offered without a front-end sales charge, but will in most cases be subject to a 
                   CDSC of 1.0% if redeemed within one year after purchase. The Fund is authorized to reimburse the Distributor 
                   for specific expenses incurred in promoting the distribution of the Fund's Class C shares and servicing 
                   shareholder accounts pursuant to the Fund's 12b-1 Plan. Reimbursement may in no event exceed an amount 
                   equal to payments at an annual rate of 0.70% of average daily net assets of the Class (see pages 16, 
                   23 and 24). 

                   o Class D shares are offered only to investors meeting an initial investment minimum of $5 million and 
                   to certain other limited categories of investors. Class D shares are offered without a front-end sales 
                   charge or CDSC and are not subject to any 12b-1 fee (see pages 16, 23 and 24). All shares of the Fund 
                   held prior to July 28, 1997 have been designated Class D shares. Additional investments in Class D shares 
                   by shareholders holding such shares may only be made if those shareholders are otherwise eligible to 
                   purchase Class D shares. However, shareholders holding such shares will receive the benefit of the value 
                   of such shares towards reduced sales charges on purchases of Class A shares pursuant to the Fund's "Right 
                   of Accumulation" (see page 20). 
- ---------------------------------------------------------------------------------------------------------------------------
Dividends and      Dividends from net investment income are declared daily and paid monthly; capital gains, if any, may 
Capital Gains      be distributed annually or retained for reinvestment by the Fund. Dividends and capital gains distributions 
Distributions      paid on shares of a Class are automatically reinvested in additional shares of the same Class at net 
                   asset value unless the shareholder elects to receive cash. Shares acquired by dividend and distribution 
                   reinvestment will not be subject to any sales charge or CDSC (see pages 26 and 30). 
- ---------------------------------------------------------------------------------------------------------------------------
Redemption         Shares are redeemable by the shareholder at net asset value less any applicable CDSC on Class A, Class 
                   B or Class C shares. An account may be involuntarily redeemed if the total value of the account is less 
                   than $100 or, if the account was opened through EasyInvest (Service Mark), if after twelve months the 
                   shareholder has invested less than $1,000 in the account (see page 29). 
- ---------------------------------------------------------------------------------------------------------------------------
Risks              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 and the 
                   ability of the issuers of the Fund's portfolio securities to pay interest and principal on such obligations. 
                   The Fund may purchase when-issued and delayed delivery securities (see page 12). The Fund may also invest 
                   in futures and options, which may be considered speculative in nature and which may involve greater risks 
                   than those customarily assumed by certain other investment companies which do not invest in such instruments 
                   (see pages 12-14). 
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>
    

 The above is qualified in its entirety by the detailed information appearing
  elsewhere in the Prospectus and in the Statement of Additional Information.

                                3           
<PAGE>
SUMMARY OF FUND EXPENSES 
- ----------------------------------------------------------------------------- 

   
   The following table illustrates all expenses and fees that a shareholder 
of the Fund will incur. The expenses and fees set forth in the table are 
based on the expenses and fees for the fiscal year ended December 31, 1997. 
    

   
<TABLE>
<CAPTION>
                                                        CLASS A      CLASS B       CLASS C      CLASS D 
                                                        -------      -------       -------      -------
<S>                                                      <C>           <C>          <C>          <C>
Shareholder Transaction Expenses 
- --------------------------------
Maximum Sales Charge Imposed on Purchases (as a 
 percentage of offering price) .....................     4.25%(1)      None         None         None 
Sales Charge Imposed on Dividend Reinvestments  ....     None          None         None         None 
Maximum Contingent Deferred Sales Charge 
 (as a percentage of original purchase price or 
 redemption proceeds)...............................     None(2)       5.00%(3)     1.00%(4)     None 
Redemption Fees.....................................     None          None         None         None 
Exchange Fee........................................     None          None         None         None 
Annual Fund Operating Expenses (as a percentage of average net assets) 
- ----------------------------------------------------------------------
Management Fees ....................................     0.44%         0.44%        0.44%        0.44% 
12b-1 Fees (5)(6)...................................     0.25%         0.60%        0.70%        None 
Other Expenses .....................................     0.05%         0.05%        0.05%        0.05% 
Total Fund Operating Expenses (7)...................     0.74%         1.09%        1.19%        0.49% 
</TABLE>
    

   
- ------------ 
(1)    Reduced for purchases of $25,000 and over (see "Purchase of Fund 
       Shares--Initial Sales Charge Alternative--Class A Shares"). 
(2)    Investments that are not subject to any sales charge at the time of 
       purchase are subject to a CDSC of 1.00% that will be imposed on 
       redemptions made within one year after purchase, except for certain 
       specific circumstances (see "Purchase of Fund Shares--Initial Sales 
       Charge Alternative--Class A Shares"). 
(3)    The CDSC is scaled down to 1.00% during the sixth year, reaching zero 
       thereafter. 
(4)    Only applicable to redemptions made within one year after purchase (see 
       "Purchase of Fund Shares--Level Load Alternative--Class C Shares"). 
(5)    The 12b-1 fee is accrued daily and payable monthly. The entire 12b-1 
       fee payable by Class A and a portion of the 12b-1 fee payable by each 
       of Class B and Class C equal to 0.15% of the average daily net assets 
       of Class B and 0.25% of the average daily net assets of Class C are 
       currently each characterized as a service fee within the meaning of 
       National Association of Securities Dealers, Inc. ("NASD") guidelines 
       and are payments made for personal service and/or maintenance of 
       shareholder accounts. The remainder of the 12b-1 fee, if any, is an 
       asset-based sales charge, and is a distribution fee paid to the 
       Distributor to compensate it for the services provided and the expenses 
       borne by the Distributor and others in the distribution of the Fund's 
       shares (see "Purchase of Fund Shares--Plan of Distribution"). 
(6)    Upon conversion of Class B shares to Class A shares, such shares will 
       be subject to the lower 12b-1 fee applicable to Class A shares. No 
       sales charge is imposed at the time of conversion of Class B shares to 
       Class A shares. Class C shares do not have a conversion feature and, 
       therefore, are subject to an ongoing 0.70% distribution fee (see 
       "Purchase of Fund Shares--Alternative Purchase Arrangements"). 
(7)    There were no outstanding shares of Class A, Class B or Class C prior 
       to July 28, 1997. Accordingly, "Total Fund Operating Expenses," as 
       shown above with respect to those Classes, are estimates based upon the 
       sum of 12b-1 Fees, Management Fees and estimated "Other Expenses." 
    

                                4           
<PAGE>
- ----------------------------------------------------------------------------- 

   
<TABLE>
<CAPTION>
EXAMPLES                                                          1 YEAR    3 YEARS   5 YEARS    10 YEARS 
- --------                                                          ------    -------   -------    --------
<S>                                                                 <C>       <C>       <C>        <C>
You would pay the following expenses on a $1,000 investment 
assuming (1) a 5% annual return and (2) redemption at the end 
of each time period: 
  Class A ......................................................    $50       $65       $82        $130 
  Class B ......................................................    $61       $65       $80        $133 
  Class C.......................................................    $22       $38       $65        $144 
  Class D ......................................................    $ 5       $16       $27        $ 62 

You would pay the following expenses on the same $1,000 
investment assuming no redemption at the end of the period: 
  Class A ......................................................    $50       $65       $82        $130 
  Class B ......................................................    $11       $35       $60        $133 
  Class C ......................................................    $12       $38       $65        $144 
  Class D ......................................................    $ 5       $16       $27        $ 62 
</TABLE>
    

   THE ABOVE EXAMPLES SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR 
FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF EACH CLASS MAY BE GREATER 
OR LESS THAN THOSE SHOWN. 

   The purpose of this table is to assist the investor in understanding the 
various costs and expenses that an investor in the Fund will bear directly or 
indirectly. For a more complete description of these costs and expenses, see 
"The Fund and its Management," "Purchase of Fund Shares--Plan of 
Distribution" and "Redemptions and Repurchases." 

   Long-term shareholders of Class B and Class C may pay more in sales 
charges, including distribution fees, than the economic equivalent of the 
maximum front-end sales charges permitted by the NASD. 

                                5           
<PAGE>
FINANCIAL HIGHLIGHTS 
- ----------------------------------------------------------------------------- 

   
   The following ratios and per share data for a share of beneficial interest 
outstanding throughout each period have been audited by Price Waterhouse LLP, 
independent accountants. The financial highlights should be read in 
conjunction with the financial statements, the notes thereto and the 
unqualified report of independent accountants, which are contained in the 
Statement of Additional Information. Further information about the 
performance of the Fund is contained in the Fund's Annual Report to 
Shareholders, which may be obtained without charge upon request to the Fund. 
    

   
<TABLE>
<CAPTION>
                                                                   FOR THE YEAR ENDED DECEMBER 31, 
                                 -------------------------------------------------------------------------------------------------
                                    1997*     1996     1995      1994      1993      1992     1991      1990       1989     1988
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                <C>       <C>      <C>       <C>       <C>       <C>      <C>       <C>        <C>      <C>
CLASS D SHARES 
PER SHARE OPERATING PERFORMANCE: 
Net asset value, beginning 
 of period...................      $11.77    $12.09   $11.01    $12.41    $11.88    $11.65   $11.09    $11.28     $10.96   $10.45 
                                   ------    ------   ------    ------    ------    ------   ------    ------     ------   ------
Net investment income .......        0.63      0.65     0.67      0.70      0.77      0.79     0.80      0.80       0.81     0.81 
Net realized and unrealized 
 gain (loss).................        0.36     (0.24)    1.19     (1.37)     0.54      0.23     0.56     (0.18)      0.32     0.51 
                                   ------    ------   ------    ------    ------    ------   ------    ------     ------   ------
Total from investment 
 operations..................        0.99      0.41     1.86     (0.67)     1.31      1.02     1.36      0.62       1.13     1.32 
                                   ------    ------   ------    ------    ------    ------   ------    ------     ------   ------
Less dividends and 
 distributions from: 
 Net investment income.......       (0.63)    (0.65)   (0.67)    (0.70)    (0.77)    (0.79)   (0.80)    (0.81)     (0.81)   (0.81) 
 Net realized gain...........       (0.05)    (0.08)   (0.11)    (0.03)    (0.01)     --       --        --         --       -- 
                                   ------    ------   ------    ------    ------    ------   ------    ------     ------   ------
Total dividends and 
 distributions...............       (0.68)    (0.73)   (0.78)    (0.73)    (0.78)    (0.79)   (0.80)    (0.81)     (0.81)   (0.81) 
                                   ------    ------   ------    ------    ------    ------   ------    ------     ------   ------
Net asset value, end of 
 period......................      $12.08    $11.77   $12.09    $11.01    $12.41    $11.88   $11.65    $11.09     $11.28   $10.96 
                                   ======    ======   ======    ======    ======    ======   ======    ======     ======   ======
TOTAL INVESTMENT RETURN+ ....        8.73%     3.61%   17.37%    (5.55)%   11.23%     9.09%   12.71%     5.86%     10.61%   13.02% 
RATIOS TO AVERAGE NET ASSETS: 
Expenses.....................        0.49%     0.48%    0.48%     0.47%     0.47%     0.49%    0.51%     0.51%      0.51%    0.54% 
Net investment income........        5.34%     5.52%    5.76%     6.02%     6.23%     6.74%    7.05%     7.25%      7.31%    7.51% 
SUPPLEMENTAL DATA: 
Net assets, end of period, 
 in millions.................      $1,097    $1,190   $1,325    $1,295    $1,582    $1,323   $1,145    $1,010     $1,033   $  908 
Portfolio turnover rate .....          16%       18%      21%       16%       13%        4%      10%       19%        13%      17% 
</TABLE>
    

   
- ------------ 
*       Prior to July 28, 1997, the Fund issued one class of shares. All 
        shares of the Fund held prior to that date have been designated Class 
        D shares. 
+       Calculated based on the net asset value as of the last business day  
        of the period. 
    

                                6           
<PAGE>
   
FINANCIAL HIGHLIGHTS, continued 
- ----------------------------------------------------------------------------- 
    

   
<TABLE>
<CAPTION>
                                           FOR THE PERIOD 
                                           JULY 28, 1997* 
                                              THROUGH 
                                         DECEMBER 31, 1997
                                         -----------------
<S>                                      <C>
CLASS A SHARES 
PER SHARE OPERATING PERFORMANCE: 
Net asset value, beginning of period ...      $ 12.00 
                                             --------
Net investment income ..................         0.25 
Net realized and unrealized gain .......         0.14 
                                             --------
Total from investment operations  ......         0.39 
                                             --------
Less dividends and distributions from: 
 Net investment income .................        (0.25) 
 Net realized gain .....................        (0.05) 
                                             --------
Total dividends and distributions  .....        (0.30) 
                                             --------
Net asset value, end of period .........      $ 12.09 
                                             ========
TOTAL INVESTMENT RETURN+................         3.31%(1) 
RATIOS TO AVERAGE NET ASSETS: 
Expenses ...............................         0.76%(2)(3) 
Net investment income ..................         4.96%(2) 
SUPPLEMENTAL DATA: 
Net assets, end of period, in thousands       $ 3,857 
Portfolio turnover rate.................           16% 

CLASS B SHARES 
PER SHARE OPERATING PERFORMANCE: 
Net asset value, beginning of period ...      $ 12.00 
                                             --------
Net investment income ..................         0.23 
Net realized and unrealized gain .......         0.19 
                                             --------
Total from investment operations  ......         0.42 
                                             --------
Less dividends and distributions from: 
 Net investment income .................        (0.23) 
 Net realized gain .....................        (0.05) 
                                             --------
Total dividends and distributions  .....        (0.28) 
                                             --------
Net asset value, end of period .........      $ 12.14 
                                             ========
TOTAL INVESTMENT RETURN+................         3.57%(1) 
RATIOS TO AVERAGE NET ASSETS: 
Expenses ...............................         1.14%(2)(3) 
Net investment income ..................         4.87%(2) 
SUPPLEMENTAL DATA: 
Net assets, end of period, in thousands       $95,573 
Portfolio turnover rate ................           16% 
</TABLE>
    

   
- ------------ 
*       The date shares were first issued.  
+       Does not reflect the deduction of sales charge. Calculated based on 
        the net asset value as of the last business day of the period. 
(1)     Not annualized.               
(2)     Annualized.                  
(3)     Does not reflect the effect of expense offset of 0.02%. 

                                7           
    
<PAGE>
   
FINANCIAL HIGHLIGHTS, continued 
- ----------------------------------------------------------------------------- 
    

   
<TABLE>
<CAPTION>
                                           FOR THE PERIOD 
                                           JULY 28, 1997* 
                                              THROUGH 
                                         DECEMBER 31, 1997 
                                         -----------------
<S>                                      <C>
CLASS C SHARES 
PER SHARE OPERATING PERFORMANCE: 
Net asset value, beginning of period ...       $12.00 
                                             --------
Net investment income ..................         0.23 
Net realized and unrealized gain .......         0.16 
                                             --------
Total from investment operations  ......         0.39 
                                             --------
Less dividends and distributions from: 
 Net investment income .................        (0.23) 
 Net realized gain .....................        (0.05) 
                                             --------
Total dividends and distributions  .....        (0.28) 
                                             --------
Net asset value, end of period .........       $12.11 
                                             ========
TOTAL INVESTMENT RETURN+................         3.28%(1) 
RATIOS TO AVERAGE NET ASSETS: 
Expenses................................         1.20%(2)(3) 
Net investment income ..................         4.41%(2) 
SUPPLEMENTAL DATA: 
Net assets, end of period, in thousands        $2,953 
Portfolio turnover rate ................           16% 
</TABLE>
    

   
- ------------ 
*       The date shares were first issued. 
+       Does not reflect the deduction of sales charge. Calculated based on 
        the net asset value as of the last business day of the period. 
(1)     Not annualized.               
(2)     Annualized.                  
(3)     Does not reflect the effect of expense offset of 0.02%. 

                                8           
    
<PAGE>
   
THE FUND AND ITS MANAGEMENT 
- ----------------------------------------------------------------------------- 
    

   Dean Witter Tax-Exempt Securities Trust (the "Fund") is an open-end, 
diversified management investment company incorporated in Maryland on 
December 13, 1979. The Fund reorganized as a trust of the type commonly known 
as a "Massachusetts business trust" on April 30, 1987. 

   
   Dean Witter InterCapital Inc. ("InterCapital" or the "Investment 
Manager"), whose address is Two World Trade Center, New York, New York 10048, 
is the Fund's Investment Manager. The Investment Manager, which was 
incorporated in July, 1992, is a wholly-owned subsidiary of Morgan Stanley 
Dean Witter & Co., a preeminent global financial services firm that maintains 
leading market positions in each of its three primary businesses--securities, 
asset management and credit services. 

   InterCapital and its wholly-owned subsidiary, Dean Witter Services Company 
Inc., serve in various investment management, advisory, management and 
administrative capacities to a total of 101 investment companies, 28 of which 
are listed on the New York Stock Exchange, with combined total net assets of 
approximately $109.5 billion as of March 31, 1998. The Investment Manager 
also manages portfolios of pension plans, other institutions and individuals 
which aggregated approximately $4.1 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 for 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 $500 million, scaled 
down at various asset levels to 0.325% on net assets over $1.25 billion. For 
the fiscal year ended December 31, 1997, the Fund accrued total compensation 
to the Investment Manager amounting to 0.44% of the Fund's average daily net 
assets and the total expenses of Class D amounted to 0.49% of the Fund's 
average daily net assets of Class D. Shares of Class A, Class B and Class C 
were first issued on July 28, 1997. The expenses of the Fund include: the fee 
of the Investment Manager; the fee pursuant to the Plan of Distribution (see 
"Purchase of Fund Shares"); taxes; transfer agent, custodian and auditing 
fees; certain legal fees; and printing and other expenses relating to the 
Fund's operations which are not expressly assumed by the Investment Manager 
under its Investment Management Agreement with the Fund. 
    

INVESTMENT OBJECTIVE AND POLICIES 
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   The investment objective of the Fund is to provide a high level of current 
income which is exempt from federal income tax, consistent with the 
preservation of capital. There is no assurance that this objective will be 
achieved. This objective is fundamental and may not be changed without share- 

                                9           
<PAGE>
holder approval. The Fund seeks to achieve its investment objective by 
investing its assets in accordance with the following policies: 

   1. At least 80% of the Fund's total assets will be invested in tax-exempt 
securities, except as stated in paragraph (5) below. Tax-exempt securities 
consist of Municipal Bonds and Municipal Notes ("Municipal Obligations") and 
Municipal Commercial Paper. 

   2. At least 75% of the Fund's total assets will be invested in: (a) 
Municipal Bonds which are rated at the time of purchase within the three 
highest grades by Moody's Investors Service, Inc. ("Moody's") or Standard & 
Poor's Corporation ("S&P"); (b) Municipal Notes which at the time of purchase 
are rated in the two highest grades by Moody's or S&P, or, if not rated, have 
outstanding one or more issues of Municipal Bonds rated as set forth in 
clause (a) of this paragraph; and (c) Municipal Commercial Paper which at the 
time of purchase are rated P-1 by Moody's or A-1 by S&P. 

   3. Up to 25% of the Fund's total assets may be invested in tax-exempt 
securities which are not rated by Moody's or S&P or, if rated, are not within 
the rating categories of Moody's or S&P stated in paragraph (2) above. 

   4. In accordance with the current position of the staff of the Securities 
and Exchange Commission, tax-exempt securities which are subject to the 
federal alternative minimum tax for individual shareholders will not be 
included in the 80% total described in paragraph 1 above. (See "Dividends, 
Distributions and Taxes," below.) As such, the remaining 20% of the Fund's 
total assets may be invested in tax-exempt securities subject to the 
alternative minimum tax. 

   5. Inclusive of paragraph 4 above, up to 20% of the Fund's total assets 
may be invested in taxable money market instruments under any one or more of 
the following circumstances: (a) pending investment of proceeds of sale of 
Fund shares or of portfolio securities; (b) pending settlement of purchases 
of portfolio securities; and (c) to maintain liquidity for the purpose of 
meeting anticipated redemptions. In addition, the Fund may temporarily invest 
more than 20% of its total assets in taxable securities, or in tax-exempt 
securities subject to the federal alternative minimum tax for individual 
shareholders, to maintain a "defensive" posture when, in the opinion of the 
Investment Manager, it is advisable to do so because of market conditions. 
The types of taxable securities in which the Fund may temporarily invest are 
limited to the following short-term fixed-income securities (maturing in one 
year or less from the time of purchase): (i) obligations of the United States 
Government, its agencies, instrumentalities or authorities; (ii) commercial 
paper rated P-1 by Moody's or A-1 by S&P; (iii) certificates of deposit of 
domestic banks with assets of $1 billion or more; and (iv) repurchase 
agreements with respect to any of the foregoing portfolio securities. 

   Municipal Obligations are debt obligations of states, cities, 
municipalities and municipal agencies which generally have maturities, at the 
time of their issuance, of either one year or more (Bonds) or from six months 
to three years (Notes). Municipal Commercial Paper refers to short-term 
obligations of municipalities. Any Municipal Obligation which depends 
directly or indirectly on the credit of the Federal Government shall be 
considered to have a rating of Aaa/AAA. The Fund may purchase Municipal 
Obligations which had originally been issued by the same issuer as two 
separate series of the same issue with different interest rates, but which 
are now linked together to form one series. 

   While the Fund may invest up to 25% of its total assets in Municipal 
Obligations which are unrated or, if rated, are not within the three highest 
Bond rating categories of Moody's or S&P or the two highest Note rating 
categories of Moody's or S&P, the Fund does not intend to invest in Municipal 
Bonds which are rated below either Baa by Moody's or BBB by S&P (the lowest 
ratings considered investment grade) or, if not rated, are deemed by the 
Investment Manager to be below investment grade, in amounts exceeding 5% of 
its total assets. Investments in Municipal Bonds rated either Baa by Moody's 
or BBB by S&P may have speculative 

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characteristics and, therefore, changes in economic conditions or other 
circumstances are more likely to weaken their capacity to make principal and 
interest payments than would be the case with investments in securities with 
higher credit ratings. Municipal Bonds rated below investment grade may not 
currently be paying any interest and may have extremely poor prospects of 
ever attaining any real investment standing. 

   
   The two principal classifications of Municipal Obligations and Commercial 
Paper are "general obligation" and "revenue" obligations or commercial paper. 
General obligation bonds, notes or commercial paper are secured by the 
issuer's pledge of its faith, credit and taxing power for the payment of 
principal and interest. Issuers of general obligation bonds, notes or 
commercial paper include a state, its counties, cities, towns and other state 
government units. Revenue bonds, notes or commercial paper are payable from 
the revenues derived from a particular facility or class of facilities or, in 
some cases, from specific revenue sources. Revenue bonds, notes or commercial 
paper are issued for a wide variety of purposes, including the financing of 
electric, gas, water and sewer systems and other public utilities; industrial 
development and pollution control facilities; single and multi-family housing 
units; public buildings and facilities; air and marine ports; transportation 
facilities such as toll roads, bridges and tunnels; and health and 
educational facilities such as hospitals and dormitories. They rely primarily 
on user fees to pay debt service, although the principal revenue source is 
often supplemented by additional security features which are intended to 
enhance the creditworthiness of the issuer's obligations. In some cases, 
particularly revenue bonds issued to finance housing and public buildings, a 
direct or implied "moral obligation" of a governmental unit may be pledged to 
the payment of debt service. In other cases, a special tax or other charge 
may augment user fees. 
    

   Included within the revenue category are participations in lease 
obligations or installment purchase contracts (hereinafter collectively 
called "lease obligations") of municipalities. State and local governments 
issue lease obligations to acquire equipment and facilities. 

   Lease obligations may have risks not normally associated with general 
obligation or other revenue bonds. Leases and installment purchase or 
conditional sale contracts (which may provide for title to the leased asset 
to pass eventually to the issuer) have developed as a means for governmental 
issuers to acquire property and equipment without the necessity of complying 
with the constitutional and statutory requirements generally applicable for 
the issuance of debt. Certain lease obligations contain "non-appropriation" 
clauses that provide that the governmental issuer has no obligation to make 
future payments under the lease or contract unless money is appropriated for 
such purpose by the appropriate legislative body on an annual or other 
periodic basis. Consequently, continued lease payments on those lease 
obligations containing "non-appropriation" clauses are dependent on future 
legislative actions. If such legislative actions do not occur, the holders of 
the lease obligation may experience difficulty in exercising their rights, 
including disposition of the property. 

   Lease obligations represent a type of financing that may not have the 
depth of marketability associated with more conventional municipal 
obligations, and, as a result, certain of such lease obligations may be 
considered illiquid securities. To determine whether or not the Fund will 
consider such securities to be illiquid (the Fund may not invest more than 
ten percent of its net assets in illiquid securities), the Trustees of the 
Fund have established guidelines to be utilized by the Fund in determining 
the liquidity of a lease obligation. The factors to be considered in making 
the determination include: 1) the frequency of trades and quoted prices for 
the obligation; 2) the number of dealers willing to purchase or sell the 
security and the number of other potential purchasers; 3) the willingness of 
dealers to undertake to make a market in the security; and 4) the nature of 
the marketplace trades, including, the time needed to dispose of the 
security, the method of soliciting offers, and the mechanics of the transfer. 

   The interest rates payable on certain Municipal Bonds and Municipal Notes 
are not fixed and may fluctuate based upon changes in market rates. 

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Municipal obligations of this type are called "variable rate" obligations. 
The interest rate payable on a variable rate obligation is adjusted either at 
predesignated periodic intervals or whenever there is a change in the market 
rate of interest on which the interest rate payable is based. 

   The foregoing percentage and rating policies apply at the time of 
acquisition of a security based on the last previous determination of the 
Fund's net asset value. Any subsequent change in any rating by a rating 
service or change in percentages resulting from market fluctuations or other 
changes in the Fund's total assets will not require elimination of any 
security from the Fund's portfolio until such time as the Investment Manager 
determines that it is practicable to sell the security without undue market 
or tax consequences to the Fund. 

   The ratings assigned by Moody's and S&P represent their opinions as to the 
quality of the securities which they undertake to rate (see the Appendix to 
the Statement of Additional Information). It should be emphasized, however, 
that the ratings are general and not absolute standards of quality. 

   When-Issued and Delayed Delivery Securities.  The Fund may purchase 
tax-exempt securities on a when-issued or delayed delivery basis; i.e., 
delivery and payment can take place a month or more after the date of the 
transaction. These securities are subject to market fluctuation and no 
interest accrues to the purchaser prior to settlement. At the time the Fund 
makes the commitment to purchase such securities, it will record the 
transaction and thereafter reflect the value, each day, of such securities in 
determining its net asset value. An increase in the percentage of the Fund's 
assets committed to the purchase of securities on a when-issued or delayed 
delivery basis may increase the volatility of the Fund's net asset value. 

   Zero Coupon Securities. A portion of the fixed-income securities purchased 
by the Fund may be zero coupon securities. 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. 

RISK CONSIDERATIONS AND INVESTMENT PRACTICES 

   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 and the ability of the 
issuers of the Fund's portfolio securities to pay interest and principal on 
such obligations on a timely basis. 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. The Fund's yield will also vary based on the yield of the Fund's 
portfolio securities. 

   Futures Contracts and Options on Futures. The Fund may enter into 
financial futures contracts ("futures contracts"), options on such futures 
and municipal bond index futures contracts for hedging purposes. The Fund may 
sell a futures contract or a call option thereon or purchase a put option on 
such futures contract, if the Investment Manager anticipates interest rates 
to rise, as a hedge against a 

                               12           
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decrease in the value of the Fund's portfolio securities. If the Investment 
Manager anticipates that interest rates will decline, the Fund may purchase a 
futures contract or a call option thereon or sell a put option on such 
futures contract, to protect against an increase in the price of the 
securities the Fund intends to purchase. These futures contracts and related 
options thereon will be used only as a hedge against anticipated interest 
rate changes. A futures contract sale creates an obligation by the Fund, as 
seller, to deliver the specific type of instrument called for in the contract 
at a specified future time for a specified price. A futures contract purchase 
creates an obligation by the Fund, as purchaser, to take delivery of the 
specific type of financial instrument at a specified future time at a 
specified price. The specific securities delivered or taken, respectively, at 
settlement date, would not be determined until or near that date. The 
determination would be in accordance with the rules of the exchange on which 
the futures contract sale or purchase was effected. 

   Although the terms of futures contracts specify actual delivery or receipt 
of securities, in most instances the contracts are closed out before the 
settlement date without the making or taking of delivery of the securities. 
Closing out of a futures contract is effected by entering into an offsetting 
purchase or sale transaction. 

   Unlike a futures contract, which requires the parties to buy and sell a 
security on a set date, an option on a futures contract entitles its holder 
to decide on or before a future date whether to enter into such a contract (a 
long position in the case of a call option and a short position in the case 
of a put option). If the holder decides not to enter into the contract, the 
premium paid for the option on the contract is lost. Since the value of the 
option is fixed at the point of sale, there are not daily payments of cash to 
reflect the change in the value of the underlying contract as there are by a 
purchaser or seller of a futures contract. The value of the option does 
change and is reflected in the net asset value of the Fund. 

   A risk in employing futures contracts to protect against the price 
volatility of portfolio securities is that the prices of securities subject 
to futures contracts may correlate imperfectly with the behavior of the cash 
prices of the Fund's portfolio securities. The risk of imperfect correlation 
may be increased by the fact that the Fund will invest in futures contracts 
on taxable securities and there is no guarantee that the prices of taxable 
securities will move in a similar manner to the prices of tax-exempt 
securities. The correlation may be distorted by the fact that the futures 
market is dominated by short-term traders seeking to profit from the 
difference between a contract or security price objective and their cost of 
borrowed funds. Such distortions are generally minor and would diminish as 
the contract approached maturity. 

   Another risk is that the Fund's manager could be incorrect in its 
expectations as to the direction or extent of various interest rate movements 
or the time span within which the movements take place. For example, if the 
Fund sold futures contracts for the sale of securities in anticipation of an 
increase in interest rates, and then interest rates went down instead, 
causing bond prices to rise, the Fund would lose money on the sale. 

   In addition to the risks that apply to all options transactions (see the 
Statement of Additional Information for a description of the characteristics 
of, and the risks of investing in, options on debt securities), there are 
several special risks relating to options on futures; in particular, the 
ability to establish and close out positions on options on futures will be 
subject to the development and maintenance of a liquid secondary market. It 
is not certain that this market will develop or be maintained. 

   Municipal Bond Index Futures. The Fund may utilize municipal bond index 
futures contracts and options thereon for hedging purposes. The Fund's 
strategies in employing such contracts will be similar to that discussed 
above with respect to financial futures and options thereon. A municipal bond 
index is a method of reflecting in a single number the market value of many 
different municipal bonds and is designed to be representative of the 
municipal bond market generally. The index fluctuates in re- 

                               13           
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sponse to changes in the market values of the bonds included within the 
index. Unlike futures contracts on particular financial instruments, 
transactions in futures on a municipal bond index will be settled in cash, if 
held until the close of trading in the contract. However, like any other 
futures contract, a position in the contract may be closed out by purchase or 
sale of an offsetting contract for the same delivery month prior to 
expiration of the contract. 

   The Fund may not enter into futures contracts or purchase related options 
thereon if immediately thereafter the amount committed to margin plus the 
amount paid for premiums for unexpired options on futures contracts exceeds 
5% of the value of the Fund's total assets. The Fund may not purchase or sell 
futures contracts or related options thereon if, immediately thereafter, more 
than one-third of its net assets would be hedged. 

   
   Year 2000. The investment management services provided to the Fund by the 
Investment Manager and the services provided to shareholders by the 
Distributor and the Transfer Agent depend on the smooth functioning of their 
computer systems. Many computer software systems in use today cannot 
recognize the year 2000, but revert to 1900 or some other date, due to the 
manner in which dates were encoded and calculated. That failure could have a 
negative impact on the handling of securities trades, pricing and account 
services. The Investment Manager, the Distributor and the Transfer Agent have 
been actively working on necessary changes to their own computer systems to 
prepare for the year 2000 and expect that their systems will be adapted 
before that date, but there can be no assurance that they will be successful, 
or that interaction with other non-complying computer systems will not impair 
their services at that time. 

   In addition, it is possible that the markets for securities in which the 
Fund invests may be detrimentally affected by computer failures throughout 
the financial services industry beginning January 1, 2000. Improperly 
functioning trading systems may result in settlement problems and liquidity 
issues. In addition, corporate and governmental data processing errors may 
result in production problems for individual companies and overall economic 
uncertainties. Earnings of individual issuers will be affected by remediation 
costs, which may be substantial. Accordingly, the Fund's investments may be 
adversely affected. 
    

   For a discussion of the risks of certain types of Municipal Obligations, 
such as lease obligations, see above in "Investment Objective and Policies." 

PORTFOLIO MANAGEMENT 

   
   The Fund is actively managed by the Investment Manager with a view to 
achieving the Fund's investment objective. In determining which securities to 
purchase for the Fund or hold in the Fund's portfolio, the Investment Manager 
will rely on information from various sources, including research, analysis 
and appraisals of brokers and dealers, including Dean Witter Reynolds Inc. 
("DWR"), Morgan Stanley & Co. Incorporated and other broker-dealer affiliates 
of InterCapital, the views of others regarding economic developments and 
interest rate trends, and the Investment Manager's own analysis of factors it 
deems relevant. The Fund is managed within InterCapital's Tax-Exempt Group, 
which manages 39 tax-exempt municipal funds and fund portfolios, with 
approximately $11.2 billion in assets as of March 31, 1998. James F. 
Willison, Senior Vice President of InterCapital and Manager of InterCapital's 
Municipal Fixed Income Group and Joseph R. Arcieri, Vice President of 
InterCapital and a member of InterCapital's Municipal Fixed Income Group, 
have been the primary portfolio co-managers of the Fund since its inception 
and February, 1997, respectively, and have been portfolio managers at 
InterCapital for over five years. 

   Securities are purchased and sold principally in response to the 
Investment Manager's current evaluation of an issuer's ability to meet its 
debt obligations in the future, and the Investment Manager's current 
assessment of future changes in the levels of interest rates on tax-exempt 
securities of varying maturities. Securities purchased by the Fund are, 
    

                               14           
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generally, sold by dealers acting as principal for their own accounts. 
Pursuant to an order of the Securities and Exchange Commission, the Fund may 
effect principal transactions in certain money market instruments with DWR. 
In addition, the Fund may incur brokerage commissions on transactions 
conducted through DWR, Morgan Stanley & Co. Incorporated and other brokers 
and dealers that are affiliates of InterCapital. 

   The portfolio trading engaged in by the Fund may result in its portfolio 
turnover rate exceeding 100%. A portfolio turnover rate in excess of 100% may 
be considered high and the Fund will incur correspondingly higher transaction 
costs. Additionally, see "Dividends, Distributions and Taxes" for a 
discussion of the tax policy of the Fund. A more extensive discussion of the 
Fund's portfolio brokerage policies is set forth in the Statement of 
Additional Information. 
    

   Except as specifically noted, all investment objectives, policies and 
practices discussed above are not fundamental policies of the Fund and, as 
such, may be changed without shareholder approval. 

INVESTMENT RESTRICTIONS 
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   The investment restrictions listed below are among the restrictions which 
have been adopted by the Fund as fundamental policies. Under the Investment 
Company Act of 1940, as amended (the "Act"), a fundamental policy may not be 
changed without the vote of a majority of the outstanding voting securities 
of the Fund, as defined in the Act. 

   
   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 provided 
further that a guarantee of a security shall not be deemed to be a security 
issued by the guarantor if the value of all securities issued or guaranteed 
by the guarantor and owned by the Fund does not exceed 10% of the value of 
the total assets of the Fund; (b) a "taxable security" is any security the 
interest on which is subject to federal income tax; and (c) all percentage 
limitations apply immediately after a purchase or initial investment, and any 
subsequent change in any applicable percentage resulting from market 
fluctuations or other changes in the Fund's total assets does not require 
elimination of any security from the portfolio. 
    

The Fund may not: 

   1. Invest more than 5% of the value of its total assets in the securities 
of any one issuer (other than obligations issued or guaranteed by the United 
States Government, its agencies or instrumentalities). 

   2. Purchase more than 10% of all outstanding taxable debt securities or 
any one issuer (other than obligations issued, or guaranteed as to principal 
and interest, by the United States Government, its agencies or 
instrumentalities). 

   3. Invest more than 25% of the value of its total assets in securities of 
issuers in any one industry. This restriction does not apply to obligations 
issued or guaranteed by the United States Government, its agencies or 
instrumentalities or to cash equivalents (industrial development and 
pollution control bonds are grouped into industries based upon the business 
in which the issuers of such obligations are engaged). 

   4. Invest more than 5% of the value of its total assets in taxable 
securities of issuers having a record, together with predecessors, of less 
than three years of continuous operation. This restriction shall not apply to 
any obligation of the United States Government, its agencies or 
instrumentalities. 

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   Notwithstanding any other investment policy or restriction, the Fund may 
seek to achieve its investment objective by investing all or substantially 
all of its assets in another investment company having substantially the same 
investment objective and policies as the Fund. 

PURCHASE OF FUND SHARES 
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GENERAL 

   The Fund offers each class of its shares for sale to the public on a 
continuous basis. Pursuant to a Distribution Agreement between the Fund and 
Dean Witter Distributors Inc. (the "Distributor"), an affiliate of the 
Investment Manager, shares of the Fund are distributed by the Distributor and 
offered by DWR and other dealers who have entered into agreements with the 
Distributor ("Selected Broker-Dealers"). The principal executive office of 
the Distributor is located at Two World Trade Center, New York, New York 
10048. 

   The Fund offers four classes of shares (each, a "Class"). Class A shares 
are sold to investors with an initial sales charge that declines to zero for 
larger purchases; however, Class A shares sold without an initial sales 
charge are subject to a contingent deferred sales charge ("CDSC") of 1.0% if 
redeemed within one year of purchase, except for certain specific 
circumstances. Class B shares are sold without an initial sales charge but 
are subject to a CDSC (scaled down from 5.0% to 1.0%) payable upon most 
redemptions within six years after purchase. Class C shares are sold without 
an initial sales charge but are subject to a CDSC of 1.0% on most redemptions 
made within one year after purchase. Class D shares are sold without an 
initial sales charge or CDSC and are available only to investors meeting an 
initial investment minimum of $5 million, and to certain other limited 
categories of investors. At the discretion of the Board of Trustees of the 
Fund, Class A shares may be sold to categories of investors in addition to 
those set forth in this prospectus at net asset value without a front-end 
sales charge, and Class D shares may be sold to certain other categories of 
investors, in each case as may be described in the then current prospectus of 
the Fund. See "Alternative Purchase Arrangements--Selecting a Particular 
Class" for a discussion of factors to consider in selecting which Class of 
shares to purchase. 

   
   The minimum initial purchase is $1,000 for each Class of shares, although 
Class D shares are only available to persons investing $5 million or more and 
to certain other limited categories of investors. For the purpose of meeting 
the minimum $5 million initial investment for Class D shares, and subject to 
the $1,000 minimum initial investment for each Class of the Fund, an 
investor's existing holdings of Class A shares of the Fund and other Dean 
Witter Funds that are multiple class funds ("Dean Witter Multi-Class Funds") 
and shares of Dean Witter Funds sold with a front-end sales charge ("FSC 
Funds") and concurrent investments in Class D shares of the Fund and other 
Dean Witter Multi-Class Funds will be aggregated. Subsequent purchases of 
$100 or more may be made by sending a check, payable to Dean Witter 
Tax-Exempt Securities Trust, directly to Morgan Stanley Dean Witter Trust FSB 
(the "Transfer Agent" or "MSDW Trust") at P.O. Box 1040, Jersey City, N.J. 
07303 or by contacting an account executive of DWR or other Selected 
Broker-Dealer. When purchasing shares of the Fund, investors must specify 
whether the purchase is for Class A, Class B, Class C or Class D shares. If 
no Class is specified, the Transfer Agent will not process the transaction 
until the proper Class is identified. The minimum initial purchase in the 
case of investments through EasyInvest (Service Mark), 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 purchases made pursuant to (i) 
systematic payroll deduction plans, (ii) the InterCapital mutual fund asset 
allocation program and (iii) fee-based programs approved by the Distributor, 

                               16           
    
<PAGE>
   
pursuant to which participants pay an asset based fee for services in the 
nature of investment advisory, administrative and/or brokerage services, the 
Fund, in its discretion, may accept such purchases without regard to any 
minimum amounts which would otherwise be required, provided, in the case of 
systematic payroll deduction plans, that the Distributor has reason to believe 
that additional purchases will increase the amount of the purchase of shares 
in all accounts under such plans to at least $1,000. Certificates for shares 
purchased will not be issued unless a request is made by the shareholder in 
writing to the Transfer Agent. 

   Shares of the Fund are sold through the Distributor on a normal three 
business day settlement basis; that is, payment generally is due on or before 
the third business day (settlement date) after the order is placed with the 
Distributor. Shares of the Fund purchased through the Distributor are 
entitled to dividends beginning on the next business day following settlement 
date. Since DWR and other Selected Broker-Dealers forward investors' funds on 
settlement date, they will benefit from the temporary use of the funds where 
payment is made prior thereto. Shares purchased through the Transfer Agent 
are entitled to dividends beginning on the next business day following 
receipt of an order. As noted above, orders placed directly with the Transfer 
Agent must be accompanied by payment. Investors will be entitled to receive 
capital gains distributions if their order is received by the close of 
business on the day prior to the record date for such distributions. Sales 
personnel of a Selected Broker-Dealer are compensated for selling shares of 
the Fund by the Distributor or any of its affiliates and/or the Selected 
Broker-Dealer. In addition, some sales personnel of the Selected 
Broker-Dealer will receive various types of non-cash compensation as special 
sales incentives, including trips, educational and/or business seminars and 
merchandise. The Fund and/or the Distributor reserve the right to reject any 
purchase order. 
    

ALTERNATIVE PURCHASE ARRANGEMENTS 

   The Fund offers several Classes of shares to investors designed to provide 
them with the flexibility of selecting an investment best suited to their 
needs. The general public is offered three Classes of shares: Class A shares, 
Class B shares and Class C shares, which differ principally in terms of sales 
charges and rate of expenses to which they are subject. A fourth Class of 
shares, Class D shares, is offered only to limited categories of investors 
(see "No Load Alternative--Class D Shares" below). 

   Each Class A, Class B, Class C or Class D share of the Fund represents an 
identical interest in the investment portfolio of the Fund except that Class 
A, Class B and Class C shares bear the expenses of the ongoing shareholder 
service fees, Class B and Class C shares bear the expenses of the ongoing 
distribution fees and Class A, Class B and Class C shares which are redeemed 
subject to a CDSC bear the expense of the additional incremental distribution 
costs resulting from the CDSC applicable to shares of those Classes. The 
ongoing distribution fees that are imposed on Class A, Class B and Class C 
shares will be imposed directly against those Classes and not against all 
assets of the Fund and, accordingly, such charges against one Class will not 
affect the net asset value of any other Class or have any impact on investors 
choosing another sales charge option. See "Plan of Distribution" and 
"Redemptions and Repurchases." 

   Set forth below is a summary of the differences between the Classes and 
the factors an investor should consider when selecting a particular Class. 
This summary is qualified in its entirety by detailed discussion of each 
Class that follows this summary. 

   Class A Shares. Class A shares are sold at net asset value plus an initial 
sales charge of up to 4.25%. The initial sales charge is reduced for certain 
purchases. Investments of $1 million or more (and investments by certain 
other limited categories of investors) are not subject to any sales charges 
at the time of purchase but are subject to a CDSC of 1.0% on redemptions made 
within one year after purchase, except for certain specific circumstances. 
Class A shares are also subject to a 12b-1 fee of up to 0.25% of the average 
daily net assets of the Class. See "Initial Sales Charge Alternative--Class A 
Shares." 

                               17           
<PAGE>
   Class B Shares. Class B shares are offered at net asset value with no 
initial sales charge but are subject to a CDSC (scaled down from 5.0% to 
1.0%) if redeemed within six years of purchase. This CDSC may be waived for 
certain redemptions. Class B shares are also subject to an annual 12b-1 fee 
of 0.60% of the average daily net assets of Class B. The Class B shares' 
distribution fee will cause that Class to have higher expenses and pay lower 
dividends than Class A or Class D shares. 

   After approximately ten (10) years, Class B shares will convert 
automatically to Class A shares of the Fund, based on the relative net asset 
values of the shares of the two Classes on the conversion date. In addition, 
a certain portion of Class B shares that have been acquired through the 
reinvestment of dividends and distributions will be converted at that time. 
See "Contingent Deferred Sales Charge Alternative--Class B Shares." 

   Class C Shares. Class C shares are sold at net asset value with no initial 
sales charge but are subject to a CDSC of 1.0% on redemptions made within one 
year after purchase. This CDSC may be waived for certain redemptions. They 
are subject to an annual 12b-1 fee of up to 0.70% of the average daily net 
assets of the Class C shares. The Class C shares' distribution fee may cause 
that Class to have higher expenses and pay lower dividends than Class A or 
Class D shares. See "Level Load Alternative--Class C Shares." 

   Class D Shares. Class D shares are available only to limited categories of 
investors (see "No Load Alternative--Class D Shares" below). Class D shares 
are sold at net asset value with no initial sales charge or CDSC. They are 
not subject to any 12b-1 fees. See "No Load Alternative--Class D Shares." 

   Selecting a Particular Class. In deciding which Class of Fund shares to 
purchase, investors should consider the following factors, as well as any 
other relevant facts and circumstances: 

   The decision as to which Class of shares is more beneficial to an investor 
depends on the amount and intended length of his or her investment. Investors 
who prefer an initial sales charge alternative may elect to purchase Class A 
shares. Investors qualifying for significantly reduced or, in the case of 
purchases of $1 million or more, no initial sales charges may find Class A 
shares particularly attractive because similar sales charge reductions are 
not available with respect to Class B or Class C shares. Moreover, Class A 
shares are subject to lower ongoing expenses than are Class B or Class C 
shares over the term of the investment. As an alternative, Class B and Class 
C shares are sold without any initial sales charge so the entire purchase 
price is immediately invested in the Fund. Any investment return on these 
additional investment amounts may partially or wholly offset the higher 
annual expenses of these Classes. Because the Fund's future return cannot be 
predicted, however, there can be no assurance that this would be the case. 

   Finally, investors should consider the effect of the CDSC period and any 
conversion rights of the Classes in the context of their own investment time 
frame. For example, although Class C shares are subject to a significantly 
lower CDSC upon redemptions, they do not, unlike Class B shares, convert into 
Class A shares after approximately ten years, and, therefore, are subject to 
an ongoing 12b-1 fee of 0.70% (rather than the 0.25% fee applicable to Class 
A shares) for an indefinite period of time. Thus, Class B shares may be more 
attractive than Class C shares to investors with longer term investment 
outlooks. Other investors, however, may elect to purchase Class C shares if, 
for example, they determine that they do not wish to be subject to a 
front-end sales charge and they are uncertain as to the length of time they 
intend to hold their shares. 

   For the purpose of meeting the $5 million minimum investment amount for 
Class D shares, holdings of Class A shares in all Dean Witter Multi-Class 
Funds, shares of FSC Funds and shares of Dean Witter Funds for which such 
shares have been exchanged will be included together with the current 
investment amount. 

   Sales personnel may receive different compensation for selling each Class 
of shares. Investors 

                               18           
<PAGE>
should understand that the purpose of a CDSC is the same as that of the 
initial sales charge in that the sales charges applicable to each Class 
provide for the financing of the distribution of shares of that Class. 

   Set forth below is a chart comparing the sales charge, 12b-1 fees and 
conversion options applicable to each Class of shares: 

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------
                                                          CONVERSION 
   CLASS          SALES CHARGE          12B-1 FEE          FEATURE 
- -------------------------------------------------------------------------------
   <S>        <C>                       <C>                <C>
     A        Maximum 4.25%               0.25%             No
              Initial sales charge 
              reduced for 
              purchases of 
              $25,000 and over; 
              shares sold without 
              an initial sales 
              charge generally 
              subject to a 1.0% 
              CDSC during first 
              year.                                            
- -------------------------------------------------------------------------------
     B        Maximum 5.0%                0.60%            B shares convert
              CDSC during the first                        to A shares     
              year decreasing                              automatically   
              to 0 after six years                         after           
                                                           approximately   
                                                           ten years       
- -------------------------------------------------------------------------------
     C        1.0% CDSC during            0.70%             No
              first year                  
- -------------------------------------------------------------------------------
     D        None                        None              No 
- -------------------------------------------------------------------------------

</TABLE>

   See "Purchase of Fund Shares" and "The Fund and its Management" for a 
complete description of the sales charges and service and distribution fees 
for each Class of shares and "Determination of Net Asset Value," "Dividends, 
Distributions and Taxes" and "Shareholder Services--Exchange Privilege" for 
other differences between the Classes of shares. 

INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES 

   Class A shares are sold at net asset value plus an initial sales charge. 
In some cases, reduced sales charges may be available, as described below. 
Investments of $1 million or more (and investments by certain other limited 
categories of investors) are not subject to any sales charges at the time of 
purchase but are subject to a CDSC of 1.0% on redemptions made within one 
year after purchase (calculated from the last day of the month in which the 
shares were purchased), except for certain specific circumstances. The CDSC 
will be assessed on an amount equal to the lesser of the current market value 
or the cost of the shares being redeemed. The CDSC will not be imposed (i) in 
the circumstances set forth below in the section "Contingent Deferred Sales 
Charge Alternative--Class B Shares--CDSC Waivers," except that the references 
to six years in the first paragraph of that section shall mean one year in 
the case of Class A shares, and (ii) in the circumstances identified in the 
section "Additional Net Asset Value Purchase Options" below. Class A shares 
are also subject to an annual 12b-1 fee of up to 0.25% of the average daily 
net assets of the Class. 

   The offering price of Class A shares will be the net asset value per share 
next determined following receipt of an order (see "Determination of Net 
Asset Value" below), plus a sales charge (expressed as a percentage of the 
offering price) on a single transaction as shown in the following table: 

<TABLE>
<CAPTION>
                                SALES CHARGE 
                                ------------
                       PERCENTAGE OF     APPROXIMATE 
  AMOUNT OF SINGLE    PUBLIC OFFERING   PERCENTAGE OF 
     TRANSACTION           PRICE       AMOUNT INVESTED 
     -----------           -----       ---------------
<S>                   <C>              <C>
Less than $25,000  ..      4.25%            4.44% 
$25,000 but less 
  than $50,000 ......      4.00%            4.17% 
$50,000 but less 
  than $100,000 .....      3.50%            3.63% 
$100,000 but less 
  than $250,000 .....      2.75%            2.83% 
$250,000 but less 
  than $1 million  ..      1.75%            1.78% 
$1 million and over          0                 0 
</TABLE>

   Upon notice to all Selected Broker-Dealers, the Distributor may reallow up 
to the full applicable sales charge as shown in the above schedule during 
periods specified in such notice. During periods when 90% or more of the 
sales charge is reallowed, such Selected Broker-Dealers may be deemed to be 
underwriters as that term is defined in the Securities Act of 1933. 

   The above schedule of sales charges is applicable to purchases in a single 
transaction by, among others: (a) an individual; (b) an individual, his or 
her spouse and their children under the age of 21 purchasing shares for his, 
her or their own accounts; 

                               19           
<PAGE>

(c) a trustee or other fiduciary purchasing shares for a single trust estate 
or a single fiduciary account; (d) a pension, profit-sharing or other 
employee benefit plan qualified or non-qualified under Section 401 of the 
Internal Revenue Code; (e) tax-exempt organizations enumerated in Section 
501(c)(3) or (13) of the Internal Revenue Code; (f) employee benefit plans 
qualified under Section 401 of the Internal Revenue Code of a single employer 
or of employers who are "affiliated persons" of each other within the meaning 
of Section 2(a)(3)(c) of the Act; and for investments in Individual 
Retirement Accounts of employees of a single employer through Systematic 
Payroll Deduction plans; or (g) any other organized group of persons, whether 
incorporated or not, provided the organization has been in existence for at 
least six months and has some purpose other than the purchase of redeemable 
securities of a registered investment company at a discount. 

   Combined Purchase Privilege. Investors may have the benefit of reduced 
sales charges in accordance with the above schedule by combining purchases of 
Class A shares of the Fund in single transactions with the purchase of Class 
A shares of other Dean Witter Multi-Class Funds and shares of FSC Funds. The 
sales charge payable on the purchase of the Class A shares of the Fund, the 
Class A shares of the other Dean Witter Multi-Class Funds and the shares of 
the FSC Funds will be at their respective rates applicable to the total 
amount of the combined concurrent purchases of such shares. 

   
   Right of Accumulation. The above persons and entities may benefit from a 
reduction of the sales charges in accordance with the above schedule if the 
cumulative net asset value of Class A shares purchased in a single 
transaction, together with shares of the Fund and other Dean Witter Funds 
previously purchased at a price including a front-end sales charge (including 
shares of the Fund and other Dean Witter Funds acquired in exchange for those 
shares, and including in each case shares acquired through reinvestment of 
dividends and distributions), which are held at the time of such transaction, 
amounts to $25,000 or more. If such investor has a cumulative net asset value 
of shares of FSC Funds and Class A and Class D shares that, together with the 
current investment amount, is equal to at least $5 million, such investor is 
eligible to purchase Class D shares subject to the $1,000 minimum initial 
investment requirement of that Class of the Fund. See "No Load 
Alternative--Class D Shares" below. 
    

   The Distributor must be notified by DWR or a Selected Broker-Dealer or the 
shareholder at the time a purchase order is placed that the purchase 
qualifies for the reduced charge under the Right of Accumulation. Similar 
notification must be made in writing by the dealer or shareholder when such 
an order is placed by mail. The reduced sales charge will not be granted if: 
(a) such notification is not furnished at the time of the order; or (b) a 
review of the records of the Selected Broker-Dealer or the Transfer Agent 
fails to confirm the investor's represented holdings. 

   Letter of Intent. The foregoing schedule of reduced sales charges will 
also be available to investors who enter into a written Letter of Intent 
providing for the purchase, within a thirteen-month period, of Class A shares 
of the Fund from DWR or other Selected Broker-Dealers. The cost of Class A 
shares of the Fund or shares of other Dean Witter Funds which were previously 
purchased at a price including a front-end sales charge during the 90-day 
period prior to the date of receipt by the Distributor of the Letter of 
Intent, or of Class A shares of the Fund or shares of other Dean Witter Funds 
acquired in exchange for shares of such funds purchased during such period at 
a price including a front-end sales charge, which are still owned by the 
shareholder, may also be included in determining the applicable reduction. 

   Additional Net Asset Value Purchase Options. In addition to investments of 
$1 million or more, Class A shares also may be purchased at net asset value 
by the following: 

   
   (1) trusts for which MSDW Trust (an affiliate of the Investment Manager) 
provides discretionary trustee services; 
    

                               20           
<PAGE>
   
   (2) persons participating in a fee-based program approved by the 
Distributor, pursuant to which such persons pay an asset based fee for 
services in the nature of investment advisory, administrative and/or 
brokerage services (such investments are subject to all of the terms and 
conditions of such programs, which may include termination fees, mandatory 
redemption upon termination and such other circumstances as specified in the 
programs' agreements and restrictions on transferability of Fund shares); 
    

   (3) investors who are clients of a Dean Witter account executive who 
joined Dean Witter from another investment firm within six months prior to 
the date of purchase of Fund shares by such investors, if the shares are 
being purchased with the proceeds from a redemption of shares of an open-end 
proprietary mutual fund of the account executive's previous firm which 
imposed either a front-end or deferred sales charge, provided such purchase 
was made within sixty days after the redemption and the proceeds of the 
redemption had been maintained in the interim in cash or a money market fund; 
and 

   (4) other categories of investors, at the discretion of the Board, as 
disclosed in the then current prospectus of the Fund. 

   No CDSC will be imposed on redemptions of shares purchased pursuant to 
paragraphs (1), (2) or (3), above. 

   For further information concerning purchases of the Fund's shares, contact 
DWR or another Selected Broker-Dealer or consult the Statement of Additional 
Information. 

CONTINGENT DEFERRED SALES CHARGE ALTERNATIVE--CLASS B SHARES 

   Class B shares are sold at net asset value next determined without an 
initial sales charge so that the full amount of an investor's purchase 
payment may be immediately invested in the Fund. A CDSC, however, will be 
imposed on most Class B shares redeemed within six years after purchase. The 
CDSC will be imposed on any redemption of shares if after such redemption the 
aggregate current value of a Class B account with the Fund falls below the 
aggregate amount of the investor's purchase payments for Class B shares made 
during the six years preceding the redemption. In addition, Class B shares 
are subject to an annual 12b-1 fee of 0.60% of the average daily net assets 
of Class B. 

   
   Except as noted below, Class B shares of the Fund which are held for six 
years or more after purchase (calculated from the last day of the month in 
which the shares were purchased) will not be subject to any CDSC upon 
redemption. Shares redeemed earlier than six years after purchase may, 
however, be subject to a CDSC which will be a percentage of the dollar amount 
of shares redeemed and will be assessed on an amount equal to the lesser of 
the current market value or the cost of the shares being redeemed. The size 
of this percentage will depend upon how long the shares have been held, as 
set forth in the following table: 
    

<TABLE>
<CAPTION>
         YEAR SINCE 
          PURCHASE            CDSC AS A PERCENTAGE 
        PAYMENT MADE           OF AMOUNT REDEEMED 
        ------------           ------------------
<S>                           <C>
First......................           5.0% 
Second.....................           4.0% 
Third......................           3.0% 
Fourth.....................           2.0% 
Fifth......................           2.0% 
Sixth......................           1.0% 
Seventh and thereafter ....           None 
</TABLE>

   
   Class B shares of the Fund issued in exchange for shares of Dean Witter 
National Municipal Trust ("National Municipal") in connection with the 
reorganization of National Municipal with the Fund on November 7, 1997 
pursuant to an Agreement and Plan of Reorganization (the "Reorganization"), 
that were subject to the lower CDSC schedule of National Municipal (as 
described below), will continue to be subject to that lower CDSC schedule 
unless (i) such shares are subsequently exchanged for shares of a fund with a 
higher CDSC schedule or (ii) having been exchanged for shares of Dean Witter 
Global Short-Term Income Fund Inc. ("Global Short-Term") or an Exchange Fund 
(as defined below in "Shareholder Services--Exchange Privilege") are re- 

                               21           
    
<PAGE>
   
exchanged back into the Fund. Under such circumstances, the CDSC schedule 
applicable to shares of the fund with the higher CDSC schedule acquired in 
the exchange will apply to redemptions of such fund's shares or, in the case 
of shares of Global Short-Term or any of the Exchange Funds acquired in an 
exchange and then subsequently re-exchanged back into the Fund, the CDSC 
schedule set forth in the above table will apply to redemptions of any of 
such shares. The CDSC schedule applicable to National Municipal was as 
follows: Shares held for three years or more after purchase (calculated as 
described in the paragraph above) are not subject to any CDSC upon 
redemption. However, shares redeemed earlier than three years after purchase 
may be subject to a CDSC (calculated as described in the paragraph above), 
the percentage of which depends on how long the shares have been held, as set 
forth in the following table: 


<TABLE>
<CAPTION>
        YEAR SINCE 
         PURCHASE            CDSC AS A PERCENTAGE 
       PAYMENT MADE           OF AMOUNT REDEEMED 
       ------------           ------------------
<S>                          <C>
First.....................           3.0% 
Second....................           2.0% 
Third.....................           1.0% 
Fourth and thereafter ....           None 
</TABLE>
    

   CDSC Waivers. A CDSC will not be imposed on: (i) any amount which 
represents an increase in value of shares purchased within the six years 
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 FSC Funds or 
of other Dean Witter Funds acquired in exchange for such shares. Moreover, in 
determining whether a CDSC is applicable it will be assumed that amounts 
described in (i), (ii) and (iii) above (in that order) are redeemed first. 

   In addition, the CDSC, if otherwise applicable, will be waived in the case 
of: 

   (1) redemptions of shares held at the time a shareholder dies or becomes 
disabled, only if the shares are:   (A) registered either in the name of an 
individual shareholder (not a trust), or in the names of such shareholder and 
his or her spouse as joint tenants with right of survivorship; or   (B) held 
in a qualified corporate or self-employed retirement plan, Individual 
Retirement Account ("IRA") or Custodial Account under Section 403(b)(7) of 
the Internal Revenue Code ("403(b) Custodial Account"), provided in either 
case that the redemption is requested within one year of the death or initial 
determination of disability; and 

   (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. 

   With reference to (1) above, for the purpose of determining disability, 
the Distributor utilizes the definition of disability contained in Section 
72(m)(7) of the Internal Revenue Code, which relates to the inability to 
engage in gainful employment. With reference to (2) above, the term 
"distribution" does not encompass a direct transfer of IRA, 403(b) Custodial 
Account or retirement plan assets to a successor custodian or trustee. All 
waivers will be granted only following receipt by the Distributor of 
confirmation of the shareholder's entitlement. 

   Conversion to Class A Shares.  Class B shares will convert automatically 
to Class A shares, based on the relative net asset values of the shares of 
the two Classes on the conversion date, which will be approximately ten (10) 
years after the date of the original purchase. The ten year period is 
calculated from the last day of the month in which the shares were purchased 
or, in the case of Class B shares acquired through an exchange or a series of 
exchanges, from the last day of the month in which the original Class B 
shares were purchased. The conversion of shares will take place in the month 
following the tenth anniversary of the purchase. 

                               22           

<PAGE>

There will also be converted at that time such proportion of Class B shares 
acquired through automatic reinvestment of dividends and distributions owned 
by the shareholder as the total number of his or her Class B shares 
converting at the time bears to the total number of outstanding Class B 
shares purchased and owned by the shareholder. In the case of Class B shares 
previously exchanged for shares of an "Exchange Fund" (see "Shareholder 
Services--Exchange Privilege"), the period of time the shares were held in 
the Exchange Fund (calculated from the last day of the month in which the 
Exchange Fund shares were acquired) is excluded from the holding period for 
conversion. If those shares are subsequently re-exchanged for Class B shares 
of a Dean Witter Multi-Class Fund, the holding period resumes on the last day 
of the month in which Class B shares are reacquired. 

   If a shareholder has received share certificates for Class B shares, such 
certificates must be delivered to the Transfer Agent at least one week prior 
to the date for conversion. Class B shares evidenced by share certificates 
that are not received by the Transfer Agent at least one week prior to any 
conversion date will be converted into Class A shares on the next scheduled 
conversion date after such certificates are received. 

   Effectiveness of the conversion feature is subject to the continuing 
availability of a ruling of the Internal Revenue Service or an opinion of 
counsel that (i) the conversion of shares does not constitute a taxable event 
under the Internal Revenue Code, (ii) Class A shares received on conversion 
will have a basis equal to the shareholder's basis in the converted Class B 
shares immediately prior to the conversion, and (iii) Class A shares received 
on conversion will have a holding period that includes the holding period of 
the converted Class B shares. The conversion feature may be suspended if the 
ruling or opinion is no longer available. In such event, Class B shares would 
continue to be subject to Class B 12b-1 fees. 

LEVEL LOAD ALTERNATIVE--CLASS C SHARES 

   Class C shares are sold at net asset value next determined without an 
initial sales charge but are subject to a CDSC of 1.0% on most redemptions 
made within one year after purchase (calculated from the last day of the 
month in which the shares were purchased). The CDSC will be assessed on an 
amount equal to the lesser of the current market value or the cost of the 
shares being redeemed. The CDSC will not be imposed in the circumstances set 
forth above in the section "Contingent Deferred Sales Charge 
Alternative--Class B Shares--CDSC Waivers," except that the references to six 
years in the first paragraph of that section shall mean one year in the case 
of Class C shares. Class C shares are subject to an annual 12b-1 fee of up to 
0.70% of the average daily net assets of the Class. Unlike Class B shares, 
Class C shares have no conversion feature and, accordingly, an investor that 
purchases Class C shares will be subject to 12b-1 fees applicable to Class C 
shares for an indefinite period subject to annual approval by the Fund's 
Board of Trustees and regulatory limitations. 

NO LOAD ALTERNATIVE--CLASS D SHARES 

   
   Class D shares are offered without any sales charge on purchase or 
redemption and without any 12b-1 fee. Class D shares are offered only to 
investors meeting an initial investment minimum of $5 million and the 
following categories of investors: (i) investors participating in the 
InterCapital mutual fund asset allocation program pursuant to which such 
persons pay an asset based fee; (ii) persons participating in a fee-based 
program approved by the Distributor, pursuant to which such persons pay an 
asset based fee for services in the nature of investment advisory, 
administrative and/or brokerage services (subject to all of the terms and 
conditions of such programs referred to in (i) and (ii) above, which may 
include termination fees mandatory redemption upon termination and such other 
circumstances as specified in the programs' agreements, and restrictions on 
transferability of Fund shares); (iii) certain Unit Investment Trusts 
sponsored by DWR; (iv) certain other open-end investment companies whose 
shares are distributed by the Distributor; and (v) other categories of 
investors, at the discretion of the Board, as disclosed in the then current 
prospectus of the Fund. All shares of the Fund held prior to July 28, 1997 
have been 
    

                               23           
<PAGE>
designated Class D shares. Additional investments in Class D shares by 
shareholders holding such shares may only be made if those shareholders are 
otherwise eligible to purchase Class D shares. However, shareholders holding 
such shares will receive the benefit of the value of such shares towards 
reduced sales charges on purchases of Class A shares pursuant to the Fund's 
"Right of Accumulation" (see "Initial Sales Charge Alternative--Class A 
Shares--Right of Accumulation"). Investors who require a $5 million minimum 
initial investment to qualify to purchase Class D shares may satisfy that 
requirement by investing that amount in a single transaction in Class D 
shares of the Fund and other Dean Witter Multi-Class Funds, subject to the 
$1,000 minimum initial investment required for that Class of the Fund. In 
addition, for the purpose of meeting the $5 million minimum investment 
amount, holdings of Class A shares in all Dean Witter Multi-Class Funds, 
shares of FSC Funds and shares of Dean Witter Funds for which such shares 
have been exchanged will be included together with the current investment 
amount. If a shareholder redeems Class A shares and purchases Class D shares, 
such redemption may be a taxable event. 

PLAN OF DISTRIBUTION 

   Effective July 28, 1997, the Fund has adopted a Plan of Distribution 
pursuant to Rule 12b-1 under the Act with respect to the distribution of 
Class A, Class B and Class C shares of the Fund. In the case of Class A and 
Class C shares, the Plan provides that the Fund will reimburse the 
Distributor and others for the expenses of certain activities and services 
incurred by them specifically on behalf of those shares. Reimbursements for 
these expenses will be made in monthly payments by the Fund to the 
Distributor, which will in no event exceed amounts equal to payments at the 
annual rates of 0.25% and 0.70% of the average daily net assets of Class A 
and Class C, respectively. In the case of Class B shares, the Plan provides 
that the Fund will pay the Distributor a fee, which is accrued daily and paid 
monthly, at the annual rate of 0.60% of the average daily net assets of Class 
B. The fee is treated by the Fund as an expense in the year it is accrued. In 
the case of Class A shares, the entire amount of the fee currently represents 
a service fee within the meaning of the NASD guidelines. In the case of Class 
B and Class C shares, a portion of the fee payable pursuant to the Plan, 
equal to 0.15% and 0.25% of the average daily net assets of each of these 
Classes, respectively, is currently characterized as a service fee. A service 
fee is a payment made for personal service and/or the maintenance of 
shareholder accounts. 

   
   Additional amounts paid under the Plan in the case of Class B and Class C 
shares are paid to the Distributor for services provided and the expenses 
borne by the Distributor and others in the distribution of the shares of 
those Classes, including the payment of commissions for sales of the shares 
of those Classes and incentive compensation to and expenses of DWR's account 
executives and others who engage in or support distribution of shares or who 
service shareholder accounts, including overhead and telephone expenses; 
printing and distribution of prospectuses and reports used in connection with 
the offering of the Fund's shares to other than current shareholders; and 
preparation, printing and distribution of sales literature and advertising 
materials. In addition, the Distributor may utilize fees paid pursuant to the 
Plan in the case of Class B shares to compensate DWR and other Selected 
Broker-Dealers for their opportunity costs in advancing such amounts, which 
compensation would be in the form of a carrying charge on any unreimbursed 
expenses. For the fiscal period July 28 through December 31, 1997, Class A, 
Class B and Class C shares of the Fund accrued payments under the Plan 
amounting to $2,466, $83,261 and $4,834, which amounts on an annualized basis 
are equal to 0.25%, 0.60% and 0.70% of the average daily net assets of Class 
A, Class B and Class C, respectively, for such period. 
    

   In the case of Class B shares, at any given time, the expenses in 
distributing Class B shares of the Fund may be in excess of the total of (i) 
the payments made by the Fund pursuant to the Plan, and (ii) the proceeds of 
CDSCs paid by investors 

                               24           
<PAGE>
   
upon the redemption of Class B shares. For example, if $1 million in expenses 
in distributing Class B shares of the Fund had been incurred and $750,000 had 
been received as described in (i) and (ii) above, the excess expense would 
amount to $250,000. The Distributor has advised the Fund that such excess 
amounts, including the carrying charge described above, totalled $2,732,178 
at December 31, 1997, which was equal to 2.86% of the net assets of Class B 
on such date. Of this amount, $2,455,436 represents excess distribution 
expenses of National Municipal, the net assets of which were combined with 
those of the Fund on November 7, 1997 pursuant to the Reorganization. 
Because there is no requirement under the Plan that the Distributor be 
reimbursed for all distribution expenses or any requirement that the Plan be 
continued from year to year, such excess amount does not constitute a 
liability of the Fund. Although there is no legal obligation for the Fund to 
pay expenses incurred in excess of payments made to the Distributor under the 
Plan, and the proceeds of CDSCs paid by investors upon redemption of shares, 
if for any reason the Plan is terminated the Trustees will consider at that 
time the manner in which to treat such expenses. Any cumulative expenses 
incurred, but not yet recovered through distribution fees or CDSCs, may or 
may not be recovered through future distribution fees or CDSCs. 

   In the case of Class A and Class C shares, expenses incurred pursuant to 
the Plan in any calendar year in excess of 0.25% or 0.70% of the average 
daily net assets of Class A or Class C, respectively, will not be reimbursed 
by the Fund through payments in any subsequent year, except that expenses 
representing a gross sales commission credited to account executives at the 
time of sale may be reimbursed in the subsequent calendar year. The 
Distributor has advised the Fund that unreimbursed expenses representing a 
gross sales commission credited to account executives at the time of sale 
totalled $22,030 in the case of Class C at December 31, 1997, which amount 
was equal to 0.75% of the net assets of Class C on such date, and that there 
were no such expenses that may be reimbursed in the subsequent year in the 
case of Class A on such date. No interest or other financing charges will be 
incurred on any Class A or Class C distribution expenses incurred by the 
Distributor under the Plan or on any unreimbursed expenses due to the 
Distributor pursuant to the Plan. 
    

DETERMINATION OF NET ASSET VALUE 

   The net asset value per share is determined once daily at 4:00 p.m., New 
York time, on each day that the New York Stock Exchange is open (or, on days 
when the New York Stock Exchange closes prior to 4:00 p.m., at such earlier 
time), by taking the net assets of the Fund, dividing by the number of shares 
outstanding and adjusting to the nearest cent. The assets belonging to the 
Class A, Class B, Class C and Class D shares will be invested together in a 
single portfolio. The net asset value of each Class, however, will be 
determined separately by subtracting each Class's accrued expenses and 
liabilities. The net asset value per share will not be determined on Good 
Friday and on such other federal and non-federal holidays as are observed by 
the New York Stock Exchange. 

   Portfolio securities (other than short-term taxable debt securities, 
futures and options) are valued for the Fund by an outside independent 
pricing service approved by the Fund's Trustees. The service may utilize a 
computerized grid matrix of tax-exempt securities and evaluations by its 
staff in determining what it believes is the fair value of the Fund's 
portfolio securities. The Board believes that timely and reliable market 
quotations are generally not readily available to the Fund for purposes of 
valuing tax-exempt securities and that the valuations supplied by the pricing 
services are more likely to approximate the fair value of such securities. 

   Short-term taxable debt securities with remaining maturities of sixty days 
or less at time of purchase are valued at amortized cost, unless the Board 
determines such does not reflect the securities' market value, in which case 
these securities will be valued at their fair value as determined by the 
Board of Trustees. Other taxable short-term debt securities with maturities 
of more than sixty days will 

                               25           
<PAGE>
be valued on a mark to market basis until such time as they reach a maturity 
of sixty days, whereupon they will be valued at amortized cost using their 
value on the 61st day unless the Trustees determine such does not reflect the 
securities' market value, in which case these securities will be valued at 
their fair market value as determined by the Board of Trustees. Listed 
options on debt securities are valued at the latest sale price on the 
exchange on which they are listed unless no sales of such options have taken 
place that day, in which case, they will be valued at the mean between their 
closing bid and asked prices. Unlisted options on debt securities are valued 
at the mean between their latest bid and asked price. Futures are valued at 
the latest sale price on the commodities exchange on which they trade unless 
the Board of Trustees determines that such price does not reflect their fair 
value, in which case they will be valued at their fair market value as 
determined by the Board of Trustees. All other securities and other assets 
are valued at their fair value as determined in good faith under procedures 
established by and under the supervision of the Board of Trustees. 

SHAREHOLDER SERVICES 
- ----------------------------------------------------------------------------- 

   Automatic Investment of Dividends and Distri-butions. All income dividends 
and capital gains distributions are automatically paid in full and fractional 
shares of the applicable Class of the Fund (or, if specified by the 
shareholder, in shares of any other open-end Dean Witter Fund), unless the 
shareholder requests that they be paid in cash. Shares so acquired are 
acquired at net asset value and are not subject to the imposition of a 
front-end sales charge or a CDSC (see "Redemptions and Repurchases"). Such 
dividends and distributions will be paid, at the net asset value per share 
(without sales charge), in shares of the applicable Class of the Fund (or in 
cash if the shareholder so requests) on the monthly payment date, which 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 checks 
during the first ten days of the following month. 

   Investment of Dividends and Distributions Received in Cash. Any 
shareholder who receives a cash payment representing a dividend or capital 
gains distribution may invest such dividend or distribution in shares of the 
applicable Class at the net asset value per share next determined after 
receipt by the Transfer Agent, by returning the check or the proceeds to the 
Transfer Agent within thirty days after the payment date. Shares so acquired 
are acquired at net asset value and are not subject to the imposition of a 
front-end sales charge or a CDSC (see "Redemptions and Repurchases"). 

   EasyInvest (Service Mark). Shareholders may subscribe to EasyInvest, an 
automatic purchase plan which pro-vides for any amount from $100 to $5,000 to 
be transferred automatically from a checking or savings account or following 
redemption of shares of a Dean Witter money market fund, on a semi-monthly, 
monthly or quarterly basis, to the Transfer Agent for investment in shares of 
the Fund (see "Purchase of Fund Shares" and "Redemptions and 
Repurchases--Involuntary Redemption"). 

   Systematic Withdrawal Plan. A systematic withdrawal plan (the "Withdrawal 
Plan") is available for shareholders who own or purchase shares of the Fund 
having a minimum value of $10,000 based upon the then current net asset 
value. The plan provides for monthly or quarterly (March, June, September, 
December) checks in any dollar amount, not less than $25, or in any whole 
percentage of the account balance, on an annualized basis. Any applicable 
CDSC will be imposed on shares redeemed under the Withdrawal Plan (see 
"Purchase of Fund Shares"). Therefore, any shareholder participating in the 
Withdrawal Plan will have sufficient shares redeemed from his or her account 
so that the proceeds (net of any applicable CDSC) to the shareholder will be 
the designated monthly or quarterly amount. Withdrawal plan payments should 
not 

                               26           
<PAGE>
be considered as dividends, yields or income. If periodic withdrawal plan 
payments continuously exceed net investment income and net capital gains, the 
shareholder's original investment will be correspondingly reduced and 
ultimately exhausted. Each withdrawal constitutes a redemption of shares and 
any gain or loss realized must be recognized for federal income tax purposes. 

   Shareholders should contact their DWR or other Selected Broker-Dealer 
account executive or the Transfer Agent for further information about any of 
the above services. 

EXCHANGE PRIVILEGE 

   
   Shares of each Class may be exchanged for shares of the same Class of any 
other Dean Witter Multi-Class Fund without the imposition of any exchange 
fee. Shares may also be exchanged for shares of the following funds: Dean 
Witter Short-Term U.S. Treasury Trust, Dean Witter Limited Term Municipal 
Trust, Dean Witter Short-Term Bond Fund, Dean Witter Intermediate Term U.S. 
Treasury Trust and five Dean Witter funds which are money market funds (the 
"Exchange Funds"). Class A shares may also be exchanged for shares of Dean 
Witter Multi-State Municipal Series Trust and Dean Witter Hawaii Municipal 
Trust, which are Dean Witter Funds sold with a front-end sales charge ("FSC 
Funds"). Class B shares may also be exchanged for shares of Dean Witter 
Global Short-Term Income Fund Inc. ("Global Short-Term") which is a Dean 
Witter Fund offered with a CDSC. Exchanges may be made after the shares of 
the Fund acquired by purchase (not by exchange or dividend reinvestment) have 
been held for thirty days. There is no holding period for exchanges of shares 
acquired by exchange or dividend reinvestment. 

   An exchange to another Dean Witter Multi-Class Fund, any FSC Fund, Global 
Short-Term or any Exchange Fund that is not a money market fund is on the 
basis of the next calculated net asset value per share of each fund after the 
exchange order is received. When exchanging into a money market fund from the 
Fund, shares of the Fund are redeemed out of the Fund at their next 
calculated net asset value and the proceeds of the redemption are used to 
purchase shares of the money market fund at their net asset value determined 
the following business day. Subsequent exchanges between any of the money 
market funds and any of the Dean Witter Multi-Class Funds, FSC Funds, Global 
Short-Term or any Exchange Fund that is not a money market fund can be 
effected on the same basis. 

   No CDSC is imposed at the time of any exchange of shares, although any 
applicable CDSC will be imposed upon ultimate redemption. During the period 
of time the shareholder remains in an Exchange Fund (calculated from the last 
day of the month in which the Exchange Fund shares were acquired), the 
holding period (for the purpose of determining the rate of the CDSC) is 
frozen. If those shares are subsequently re-exchanged for shares of a Dean 
Witter Multi-Class Fund or shares of Global Short-Term, the holding period 
previously frozen when the first exchange was made resumes on the last day of 
the month in which shares of a Dean Witter Multi-Class Fund or shares of 
Global Short-Term are reacquired. Thus, the CDSC is based upon the time 
(calculated as described above) the shareholder was invested in shares of a 
Dean Witter Multi-Class Fund or in shares of Global Short-Term (see "Purchase 
of Fund Shares"). In the case of exchanges of Class A shares which are 
subject to a CDSC, the holding period also includes the time (calculated as 
described above) the shareholder was invested in shares of a FSC Fund. In the 
case of shares exchanged into an Exchange Fund on or after April 23, 1990, 
upon a redemption of shares which results in a CDSC being imposed, a credit 
(not to exceed the amount of the CDSC) will be given in an amount equal to 
the Exchange Fund 12b-1 distribution fees incurred on or after that date 
which are attributable to those shares. (Exchange Fund 12b-1 distribution 
fees are described in the prospectuses for those funds.) Class B shares of 
the Fund acquired in exchange for shares of Global Short-Term or Class B 
shares of another Dean Witter Multi-Class Fund having a different CDSC 
schedule than that of this Fund will be subject to the 
    

                               27           
<PAGE>
   
higher CDSC schedule, even if such shares are subsequently re-exchanged for 
shares of the fund with the lower CDSC schedule. Class B shares of the Fund 
issued in exchange for shares of National Municipal in connection with the 
Reorganization that were subject to the lower CDSC schedule of National 
Municipal (as described below), will continue to be subject to that lower 
CDSC schedule unless (i) such shares are subsequently exchanged for shares of 
a fund with a higher CDSC schedule or (ii) having been exchanged for shares 
of Global Short-Term or an Exchange Fund are re-exchanged back into the Fund. 
Under such circumstances, the CDSC schedule applicable to shares of the fund 
with the higher CDSC schedule acquired in the exchange will apply to 
redemptions of such fund's shares or, in the case of shares of Global 
Short-Term or any of the Exchange Funds acquired in an exchange and then 
subsequently re-exchanged back into the Fund, the Fund's CDSC schedule will 
apply to redemptions of any of such shares. 
    

   Additional Information Regarding Exchanges. Purchases and exchanges should 
be made for investment purposes only. A pattern of frequent exchanges may be 
deemed by the Investment Manager to be abusive and contrary to the best 
interests of the Fund's other shareholders and, at the Investment Manager's 
discretion, may be limited by the Fund's refusal to accept additional 
purchases and/or exchanges from the investor. Although the Fund does not have 
any specific definition of what 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 shoud 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 may be 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 their margin account. 

   The current prospectus for each fund describes its investment objective(s) 
and policies, and shareholders should obtain one and read it carefully before 
investing. Exchanges are subject to the minimum investment requirement of 
each Class of shares and other conditions imposed by each fund. In the case 
of a shareholder holding a share certificate or certificates, no exchanges 
may be made until all applicable share certificates have been received by the 
Transfer Agent and deposited in the shareholder's account. An exchange will 
be treated for federal income tax purposes as a redemption or repurchase of 
shares, on which the shareholder may realize a capital gain or loss. However, 
the ability to deduct capital losses on an exchange is limited in situations 
where there is an exchange of shares within ninety days after the shares are 
purchased. There are also limits on the deduction of losses after the payment 
of exempt-interest dividends for shares held for less than six months (see 
"Dividends, Distributions and Taxes"). The Exchange Privilege is only 
available in states where an exchange may legally be made. 

   If DWR or another Selected Broker-Dealer is the current dealer of record 
and its account numbers are part of the account information, shareholders may 
initiate an exchange of shares of the Fund for shares of any of the Dean 
Witter Funds (for which the Exchange Privilege is available) pursuant to this 
Exchange Privilege by contacting their DWR or other Selected Broker-Dealer 
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 

                               28           
<PAGE>
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 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 (see "Redemptions and Repurchases"). 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. 

   
   For further information regarding the Exchange Privilege, shareholders 
should contact their DWR or other Selected Broker-Dealer account executive or 
the Transfer Agent. 
    

REDEMPTIONS AND REPURCHASES 
- ----------------------------------------------------------------------------- 

   Redemption. Shares of each Class of the Fund can be redeemed for cash at 
any time at the net asset value per share next determined less the amount of 
any applicable CDSC in the case of Class A, Class B or Class C shares (see 
"Purchase of Fund Shares"). If shares are held in a shareholder's account 
without a share certificate, a written request for redemption to the Fund's 
Transfer Agent at P.O. Box 983, Jersey City, NJ 07303 is required. If 
certificates are held by the shareholder, the shares may be redeemed by 
surrendering the certificates with a written request for redemption, along 
with any additional information required by the Transfer Agent. 

   Repurchase. DWR and other Selected Broker-Dealers are authorized to 
repurchase shares represented by a share certificate which is delivered to 
any of their offices. Shares held in a shareholder's account without a share 
certificate may also be repurchased by DWR and other Selected Broker-Dealers 
upon the telephonic request of the shareholder. The repurchase price is the 
net asset value next determined (see "Purchase of Fund Shares") after such 
repurchase order is received by DWR or other Selected Broker-Dealer reduced 
by any applicable CDSC. 

   
   The CDSC, if any, will be the only fee imposed by the Fund or the 
Distributor. The offer by DWR and other Selected Broker-Dealers to repurchase 
shares from shareholders may be suspended 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 at times 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. 

                               29           
<PAGE>
   Reinstatement Privilege. A shareholder who has had his or her share 
redeemed or repurchased and has not previously exercised this reinstatement 
privilege may, within 35 days after the date of the redemption or repurchase, 
reinstate any portion or all of the proceeds of such redemption or repurchase 
in shares of the Fund in the same Class from which such shares were redeemed 
or repurchased, at their net asset value next determined after a 
reinstatement request, together with the proceeds, is received by the 
Transfer Agent and receive a pro rata credit for any CDSC paid in connection 
with such redemption or repurchase. 

   Involuntary Redemption. The Fund reserves the right, on sixty days' 
notice, to redeem at net asset value the shares of any shareholder whose 
shares due to redemptions by the shareholder have a value of less than $100, 
or such lesser amount as may be fixed by the Board of 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 the shareholder sixty days to make an additional 
investment in an amount which will increase the value of the account to at 
least the applicable amount before the redemption is processed. No CDSC will 
be imposed on any involuntary redemption. 

DIVIDENDS, DISTRIBUTIONS AND TAXES 
- ----------------------------------------------------------------------------- 

   Dividends and Distributions. The Fund declares dividends separately for 
each Class 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 such dividends may fluctuate from 
day to day. Such dividends are paid monthly. The Fund intends to distribute 
all of its net investment income on an annual basis. 

   The Fund will distribute at least once each year all net realized 
short-term capital gains in excess of any realized net long-term capital 
losses, if any. The Fund intends to distribute all of its realized net 
long-term capital gains, if any, in excess of any realized net short-term 
capital losses and any available net capital loss carryovers, at least once 
per fiscal year, although it may elect to retain all or part of such gains 
for reinvestment. Taxable capital gains may be generated by the sale of 
portfolio securities and by transactions in options and futures contracts 
engaged in by the Fund. 

   All dividends and any capital gains distributions will be paid in 
additional Fund shares of the same Class and automatically credited to the 
shareholder's account without issuance of a share certificate unless the 
shareholder requests in writing that all dividends be paid in cash. Shares 
acquired by dividend and distribution reinvestments will not be subject to 
any front-end sales charge or CDSC. Class B shares acquired through dividend 
and distribution reinvestments will become eligible for conversion to Class A 
shares on a pro rata basis. Distributions paid on Class A and Class D shares 
will be higher than for Class B and Class C shares because distribution fees 
paid by Class B and Class C shares are higher. (See "Shareholder 
Services--Automatic Investment of Dividends and Distributions.") Any 
dividends declared in the last quarter of any calendar year which are paid in 
the following calendar year prior to February 1 will be deemed received by 
the shareholder in the prior calendar year. 

   Taxes. Because the Fund intends to distribute all of its net investment 
income and capital gains to shareholders and intends to 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. 

                               30           
<PAGE>
   The Fund intends to qualify to pay "exempt-interest dividends" to its 
shareholders by maintaining, as of the close of each quarter of its taxable 
year, at least 50% of the value of its total assets in tax-exempt securities. 
If the Fund satisfies such requirement, distributions from net investment 
income to shareholders, whether taken in cash or reinvested in additional 
shares, will be excludable from gross income for federal income tax purposes 
to the extent net investment income is represented by interest on tax-exempt 
securities. Exempt-interest dividends are included, however, in determining 
what portion, if any, of a person's Social Security benefits are subject to 
federal income tax. The Internal Revenue Code may subject interest received 
on certain otherwise tax-exempt securities to an alternative minimum tax. 
This alternative minimum tax may be incurred due to interest received on 
certain "private activity bonds" (in general, bonds that benefit 
non-government entities) issued after August 7, 1986 which, although 
tax-exempt, are used for purposes other than those generally performed by 
government units (e.g., bonds used for commercial or housing purposes). 
Income received on such bonds is classified as a "tax preference item," under 
the alternative minimum tax, for both individual and corporate investors. The 
Fund anticipates that a portion of its investments will be made in such 
"private activity bonds," with the result that a portion of the 
exempt-interest dividends paid by the Fund will be an item of tax preference 
to shareholders subject to the alternative minimum tax. In addition, certain 
corporations which are subject to the alternative minimum tax may also have 
to include exempt-interest dividends in calculating their alternative minimum 
taxable income in situations where the "adjusted current earnings" of the 
corporation exceeds its alternative minimum taxable income. 

   Under the Revenue Reconciliation Act of 1993, all or a portion of the 
Fund's gain from the sale or redemption of tax-exempt obligations purchased 
at a market discount after April 30, 1993 will be treated as ordinary income 
rather than capital gain. This rule may increase the amount of ordinary 
income dividends received by shareholders. 

   
   After the end of the calendar year, the Fund will mail to its shareholders 
a statement indicating the percentage of the dividend distributions for such 
year which constitutes exempt-interest dividends and the percentage, if any, 
that is taxable, and to what extent the taxable portion is long-term or 
short-term capital gain. Shareholders will also be notified of their 
proportionate share of long-term capital gains distributions that are 
eligible for a reduced rate of tax under the Taxpayer Relief Act of 1997. 
    

   Shareholders will normally be subject to federal income tax on dividends 
paid from interest income derived from taxable securities and on 
distributions of net short-term capital gains, if any. Distributions of 
long-term capital gains, if any, are taxable as long-term capital gains, 
regardless of how long the shareholder has held the Fund shares and 
regardless of whether the distribution is received in additional shares or in 
cash. To avoid being subject to a 31% federal backup withholding tax on 
taxable dividends, capital gains distributions and proceeds of redemptions or 
repurchases, shareholders' taxpayer identification numbers must be furnished 
and certified as to accuracy. 

   Any loss on the sale or exchange of shares of the Fund which are held for 
six months or less is disallowed to the extent of the amount of any 
exempt-interest dividend paid with respect to such shares. Treasury 
Regulations may provide for a reduction in such required holding periods. If 
a shareholder receives a distribution that is taxed as a long-term capital 
gain on shares held for six months or less and sells those shares at a loss, 
the loss will be treated as a long-term capital loss. 

   Interest on indebtedness incurred by shareholders to purchase or carry 
shares of an investment company paying exempt-interest dividends, such as the 
Fund, will not be deductible by the investor for federal income tax purposes. 

   The exemption of interest income for federal income tax purposes does not 
necessarily result in exemption under the income or other tax laws of any 

                               31           
<PAGE>
state or local taxing authority. Thus, shareholders of the Fund may be 
subject to state and local taxes on exempt-interest dividends. 

   The Fund may at times make payments from sources other than income or net 
capital gains. Payments from such sources will, in effect, represent a return 
of a portion of each shareholder's investment. All, or a portion, of such 
payments will not be taxable to shareholders. 

   Shareholders should consult their tax advisers as to the applicability of 
the above to their own tax situation. 

PERFORMANCE INFORMATION 
- ----------------------------------------------------------------------------- 

   From time to time the Fund may quote its "yield" and/or its "total return" 
in advertisements and sales literature. These figures are computed separately 
for Class A, Class B, Class C and Class D shares. Both the yield and the 
total return of the Fund are based on historical earnings and are not 
intended to indicate future performance. The yield of each Class of the Fund 
is computed by dividing the Class's net investment income over a 30-day 
period by an average value (using the average number of shares entitled to 
receive dividends and the maximum offering price per share at the end of the 
period), all in accordance with applicable regulatory requirements. Such 
amount is compounded for six months and then annualized for a twelve-month 
period to derive the Fund's yield for each Class. The Fund may also quote 
tax-equivalent yield, which is calculated by determining the pre-tax yield 
for each Class which, after being taxed at a stated rate, would be equivalent 
to the yield determined as described above. 

   The "average annual total return" of the Fund refers to a figure 
reflecting the average annualized percentage increase (or decrease) in the 
value of an initial investment in a Class of the Fund of $1,000 over periods 
of one, five and ten years. Average annual total return reflects all income 
earned by the Fund, any appreciation or depreciation of the Fund's assets, 
all expenses incurred by the applicable Class and all sales charges which 
would be incurred by shareholders, for the stated periods. It also assumes 
reinvestment of all dividends and distributions paid by the Fund. 

   In addition to the foregoing, the Fund may advertise its total return for 
each Class over different periods of time by means of aggregate, average, 
year-by-year or other types of total return figures. Such calculations may or 
may not reflect the deduction of any sales charge which, if reflected, would 
reduce the performance quoted. The Fund may also advertise the growth of 
hypothetical investments of $10,000, $50,000 or $100,000 in each Class of 
shares of the Fund. The Fund from time to time may also advertise its 
performance relative to certain performance rankings and indexes compiled by 
independent organizations (such as mutual fund performance rankings of Lipper 
Analytical Services, Inc.). 

   
   Prior to July 28, 1997, the Fund offered only one Class of shares. Because 
the distribution arrangement for Class A most closely resembles the 
distribution arrangement applicable prior to the implementation of multiple 
classes, historical performance information may be restated to reflect the 
current maximum sales charge applicable to Class A as well as the imposition 
of an ongoing 12b-1 fee. In addition, because all shares of the Fund held 
prior to July 28, 1997 have been designated Class D shares, the Fund's 
historical performance may also be restated to reflect the absence of any 
sales charge in the case of Class D shares. 
    

                               32           
<PAGE>
ADDITIONAL INFORMATION 
- ----------------------------------------------------------------------------- 

   Voting Rights. All shares of beneficial interest of the Fund are of $.01 
par value and are equal as to earnings, assets and voting privileges except 
that each Class will have exclusive voting privileges with respect to matters 
relating to distribution expenses borne solely by such Class or any other 
matter in which the interests of one Class differ from the interests of any 
other Class. In addition, Class B shareholders will have the right to vote on 
any proposed material increase in Class A's expenses, if such proposal is 
submitted separately to Class A shareholders. Also, as discussed herein, 
Class A, Class B and Class C bear the expenses related to the distribution of 
their respective shares. 

   The Fund is not required to hold Annual Meetings of Shareholders and in 
ordinary circumstances the Fund does not intend to hold such meetings. The 
Trustees may call Special Meetings of Shareholders for action by shareholder 
vote as may be required by the Act or the Declaration of Trust. Under certain 
circumstances the Trustees may be removed by action of the Trustees or by the 
shareholders. 

   Under Massachusetts law, shareholders of a business trust may, under 
certain circumstances, be held personally liable as partners for the 
obligations of the Fund. However, the Declaration of Trust contains an 
express disclaimer of shareholder liability for acts or obligations of the 
Fund, requires that Fund obligations include such disclaimer, and provides 
for indemnification and reimbursement of expenses out of the Fund's property 
for any share holder 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's being unable to meet its 
obligations is remote and, in the opinion of Massachusetts counsel to the 
Fund, the risk to Fund shareholders of personal liability is remote. 

   Code of Ethics. Directors, officers and employees of InterCapital, Dean 
Witter Services Company Inc. and the Distributor are subject to a strict Code 
of Ethics adopted by those companies. The Code of Ethics is intended to 
ensure that the interests of shareholders and other clients are placed ahead 
of any personal interest, that no undue personal benefit is obtained from a 
person's employment activities and that actual and potential conflicts of 
interest are avoided. To achieve these goals and comply with regulatory 
requirements, the Code of Ethics requires, among other things, that personal 
securities transactions by employees of the companies be subject to an 
advance clearance process to monitor that no Dean Witter Fund is engaged at 
the same time in a purchase or sale of the same security. The Code of Ethics 
bans the purchase of securities in an initial public offering, and also 
prohibits engaging in futures and options transactions and profiting on 
short-term trading (that is, a purchase within sixty days of a sale or a sale 
within sixty days of a purchase) of a security. In addition, investment 
personnel may not purchase or sell a security for their personal account 
within thirty days before or after any transaction in any Dean Witter Fund 
managed by them. Any violations of the Code of Ethics are subject to 
sanctions, including reprimand, demotion or suspension or termination of 
employment. The Code of Ethics comports with regulatory requirements and the 
recommendations in the 1994 report by the Investment Company Institute 
Advisory Group on Personal Investing. 

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

   Shareholder Inquiries. All inquiries regarding the Fund should be directed 
to the Fund at the telephone numbers or address set forth on the front cover 
of this Prospectus. 

                               33           
<PAGE>
                       THE DEAN WITTER FAMILY OF FUNDS 

MONEY MARKET FUNDS 
Dean Witter California Tax-Free Daily Income Trust 
Dean Witter Liquid Asset Fund Inc. 
Dean Witter New York Municipal Money Market Trust 
Dean Witter Tax-Free Daily Income Trust 
Dean Witter U.S. Government Money Market Trust 

   
EQUITY FUNDS 
Dean Witter American Value Fund 
Dean Witter Balanced Growth Fund 
Dean Witter Capital Appreciation Fund 
Dean Witter Capital Growth Securities 
Dean Witter Developing Growth Securities Trust 
Dean Witter Dividend Growth Securities Inc. 
Dean Witter European Growth Fund Inc. 
Dean Witter Financial Services Trust 
Dean Witter Fund of Funds 
Dean Witter Global Dividend Growth Securities 
Dean Witter Global Utilities Fund 
Dean Witter Health Sciences Trust 
Dean Witter Income Builder Fund 
Dean Witter Information Fund 
Dean Witter International SmallCap Fund 
Dean Witter Japan Fund 
Dean Witter Market Leader Trust 
Dean Witter Mid-Cap Growth Fund 
Dean Witter Natural Resource Development 
 Securities Inc. 
Dean Witter Pacific Growth Fund Inc. 
Dean Witter Precious Metals and Minerals Trust 
Dean Witter Special Value Fund 
Dean Witter S&P 500 Index Fund 
Dean Witter Utilities Fund 
Dean Witter Value-Added Market Series 
Dean Witter World Wide Investment Trust 
Morgan Stanley Dean Witter Competitive Edge Fund, 
 "Best Ideas" Portfolio 
Morgan Stanley Dean Witter Growth Fund 
Morgan Stanley Dean Witter Mid-Cap Dividend 
 Growth Securities 
    

ASSET ALLOCATION FUNDS 
Dean Witter Global Asset Allocation Fund 
Dean Witter Strategist Fund 

FIXED-INCOME FUNDS
Dean Witter Balanced Income Fund
Dean Witter California Tax-Free Income Fund
Dean Witter Convertible Securities Trust
Dean Witter Diversified Income Trust
Dean Witter Federal Securities Trust
Dean Witter Global Short-Term Income Fund Inc.
Dean Witter Hawaii Municipal Trust
Dean Witter High Yield Securities Inc.
Dean Witter Intermediate Income Securities
Dean Witter Intermediate Term
 U.S. Treasury Trust
Dean Witter Limited Term Municipal Trust
Dean Witter Multi-State Municipal Series Trust
Dean Witter New York Tax-Free Income Fund
Dean Witter Short-Term Bond Fund
Dean Witter Short-Term U.S. Treasury Trust
Dean Witter Tax-Exempt Securities Trust
Dean Witter U.S. Government Securities Trust
Dean Witter World Wide Income Trust

DEAN WITTER RETIREMENT
SERIES
American Value Series
Capital Growth Series
Dividend Growth Series
Global Equity Series
Intermediate Income Securities Series
Liquid Asset Series
Strategist Series
U.S. Government Money Market Series
U.S. Government Securities Series
Utilities Series
Value-Added Market Series

ACTIVE ASSETS ACCOUNT
PROGRAM
Active Assets California Tax-Free Trust
Active Assets Government Securities Trust
Active Assets Money Trust
Active Assets Tax-Free Trust
   
C66679
    

<PAGE>

Dean Witter 
Tax-Exempt Securities Trust 
Two World Trade Center 
New York, New York 10048 

   
TRUSTEES 
Michael Bozic 
Charles A. Fiumefreddo 
Edwin J. Garn 
John R. Haire 
Wayne E. Hedien 
Dr. Manuel H. Johnson 
Michael E. Nugent 
Philip J. Purcell 
John L. Schroeder 
    

OFFICERS 
Charles A. Fiumefreddo 
Chairman and Chief Executive Officer 

Barry Fink 
Vice President, Secretary and 
General Counsel 

James F. Willison 
Vice President 

Joseph R. Arcieri 
Vice President 

Thomas F. Caloia 
Treasurer 

CUSTODIAN 
The Bank of New York 
90 Washington Street 
New York, New York 10286 

   
TRANSFER AGENT AND 
DIVIDEND DISBURSING AGENT 
Morgan Stanley Dean Witter Trust FSB 
Harborside Financial Center 
Plaza Two 
Jersey City, New Jersey 07311 
    

INDEPENDENT ACCOUNTANTS 
Price Waterhouse LLP 
1177 Avenue of the Americas 
New York, New York 10036 

INVESTMENT MANAGER 
Dean Witter InterCapital Inc. 

DEAN WITTER 
TAX-EXEMPT 
SECURITIES 
TRUST 

   
PROSPECTUS--APRIL 17, 1998
    


<PAGE>
   
STATEMENT OF ADDITIONAL INFORMATION 
APRIL 17, 1998 
    

                                                            DEAN WITTER 
                                                            TAX-EXEMPT 
                                                            SECURITIES 
                                                            TRUST 
- ----------------------------------------------------------------------------- 

   Dean Witter Tax-Exempt Securities Trust (the "Fund") is an open-end, 
diversified management investment company whose investment objective is to 
provide a high level of current income exempt from federal income tax, 
consistent with the preservation of capital. The Fund invests principally in 
tax-exempt fixed-income securities which are rated in the three highest 
categories by Moody's Investors Service, Inc. or Standard & Poor's 
Corporation. (See "Investment Practices and Policies.") 

   
   A Prospectus for the Fund dated April 17, 1998, which provides the basic 
information you should know before investing in the Fund, may be obtained 
without charge from the Fund at its address or telephone numbers listed below 
or from the Fund's Distributor, Dean Witter Distributors Inc., or from Dean 
Witter Reynolds Inc. at any of its branch offices. This Statement of 
Additional Information is not a Prospectus. It contains information in 
addition to and more detailed than that set forth in the Prospectus. It is 
intended to provide additional information regarding the activities and 
operations of the Fund, and should be read in conjunction with the 
Prospectus. 
    

Dean Witter 
Tax-Exempt Securities Trust 
Two World Trade Center 
New York, New York 10048 
(212) 392-2550 or 
(800) 869-NEWS (toll-free) 
<PAGE>
TABLE OF CONTENTS 
- ----------------------------------------------------------------------------- 

   
<TABLE>
<CAPTION>
<S>                                     <C>
The Fund and its Management...........   3 
Trustees and Officers.................   6 
Investment Practices and Policies ....  12 
Investment Restrictions...............  18 
Portfolio Transactions and Brokerage .  19 
The Distributor ......................  21 
Determination of Net Asset Value  ....  24 
Purchase of Fund Shares...............  25 
Shareholder Services..................  27 
Redemptions and Repurchases...........  31 
Dividends, Distributions and Taxes ...  33 
Performance Information...............  34 
Description of Shares of the Fund ....  37 
Custodian and Transfer Agent..........  37 
Independent Accountants...............  38 
Reports to Shareholders...............  38 
Legal Counsel.........................  38 
Experts...............................  38 
Registration Statement................  38 
Financial Statements--December 31, 
 1997.................................  39 
Report of Independent Accountants ....  59 
Appendix..............................  60 
</TABLE>
    

                                2           
<PAGE>
THE FUND AND ITS MANAGEMENT 
- ----------------------------------------------------------------------------- 

THE FUND 

   The Fund was incorporated in the State of Maryland on December 31, 1979 
under the name InterCapital Tax-Exempt Securities Inc. On March 17, 1983, the 
Fund's shareholders approved a change in the Fund's name, effective March 21, 
1983, to Dean Witter Tax-Exempt Securities Inc. On April 30, 1987 the Fund 
reorganized as a Massachusetts business trust, with the name Dean Witter 
Tax-Exempt Securities Trust. 

THE INVESTMENT MANAGER 

   
   Dean Witter InterCapital Inc. (the "Investment Manager" or 
"InterCapital"), whose address is Two World Trade Center, New York, New York 
10048, is the Fund's Investment Manager. InterCapital is a wholly-owned 
subsidiary of Morgan Stanley Dean Witter & Co. ("MSDWD"), a Delaware 
corporation. In an internal reorganization which took place in January, 1993, 
InterCapital assumed the investment advisory, administrative and management 
activities previously performed by the InterCapital Division of Dean Witter 
Reynolds Inc. ("DWR"), a broker-dealer affiliate of InterCapital. (As 
hereinafter used in this Statement of Additional Information, the terms 
"InterCapital" and "Investment Manager" refer to DWR's InterCapital Division 
prior to the internal reorganization and to Dean Witter InterCapital Inc. 
thereafter.) The daily management of the Fund and research relating to the 
Fund's portfolio is 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." 

   InterCapital is the investment manager or investment adviser of the 
following investment companies: Dean Witter Liquid Asset Fund Inc., 
InterCapital Income Securities Inc., InterCapital Insured Municipal Bond 
Trust, InterCapital Quality Municipal Investment Trust, InterCapital Insured 
Municipal Trust, InterCapital Quality Municipal Income Trust, InterCapital 
Insured Municipal Income Trust, InterCapital California Insured Municipal 
Income Trust, InterCapital Quality Municipal Securities, InterCapital 
California Quality Municipal Securities, InterCapital New York Quality 
Municipal Securities, InterCapital Insured Municipal Securities, InterCapital 
California Insured Municipal Securities, Dean Witter High Yield Securities 
Inc., Dean Witter Tax-Free Daily Income Trust, Dean Witter Developing Growth 
Securities Trust, Dean Witter Tax-Exempt Securities Trust, Dean Witter 
Natural Resource Development Securities Inc., Dean Witter Dividend Growth 
Securities Inc., Dean Witter American Value Fund, Dean Witter U.S. Government 
Money Market Trust, Dean Witter Variable Investment Series, Dean Witter World 
Wide Investment Trust, Dean Witter Select Municipal Reinvestment Fund, Dean 
Witter U.S. Government Securities Trust, Dean Witter California Tax-Free 
Income Fund, Dean Witter New York Tax-Free Income Fund, Dean Witter 
Convertible Securities Trust, Dean Witter Federal Securities Trust, Dean 
Witter Value-Added Market Series, High Income Advantage Trust, High Income 
Advantage Trust II, High Income Advantage Trust III, Dean Witter Government 
Income Trust, Dean Witter Utilities Fund, Dean Witter California Tax-Free 
Daily Income Trust, Dean Witter Strategist Fund, Dean Witter World Wide 
Income Trust, Dean Witter Intermediate Income Securities, Dean Witter New 
York Municipal Money Market Trust, Dean Witter Capital Growth Securities, 
Dean Witter European Growth Fund Inc., Dean Witter Precious Metals and 
Minerals Trust, Dean Witter Global Short-Term Income Fund Inc., Dean Witter 
Pacific Growth Fund Inc., Dean Witter Multi-State Municipal Series Trust, 
Dean Witter Short-Term U.S. Treasury Trust, Dean Witter Health Sciences 
Trust, Dean Witter Retirement Series, Dean Witter Limited Term Municipal 
Trust, Dean Witter Short-Term Bond Fund, Dean Witter Global Dividend Growth 
Securities, Dean Witter Global Utilities Fund, Dean Witter International 
Small Cap Fund, Dean Witter Mid-Cap Growth Fund, Dean Witter Select 
Dimensions Investment Series, Dean Witter Global Asset Allocation Fund, Dean 
Witter Balanced Growth Fund, Dean Witter Balanced Income Fund, Dean Witter 
Hawaii Municipal Trust, Dean Witter Capital Appreciation Fund, Dean Witter 
Intermediate Term U.S. Treasury Trust, Dean Witter Japan Fund, Dean Witter 
Income Builder Fund, Dean Witter Special Value Fund, Dean Witter Financial 
Services Trust, Dean Witter Market Leader Trust, Dean Witter Information 
Fund, Dean Witter S&P 500 Index Fund, Dean Witter Fund of Funds, Morgan 
Stanley Dean Witter Competitive Edge Fund--"Best Ideas" Portfolio, Morgan 
Stanley Dean Witter Growth Fund, Morgan 

                                3           
    
<PAGE>
   
Stanley Dean Witter Mid-Cap Dividend Growth Securities, Active Assets Money 
Trust, Active Assets Tax-Free Trust, Active Assets California Tax-Free Trust, 
Active Assets Government Securities Trust, Municipal Income Trust, Municipal 
Income Trust II, Municipal Income Trust III, Municipal Income Opportunities 
Trust, Municipal Income Opportunities Trust II, Municipal Income 
Opportunities Trust III, Prime Income Trust and Municipal Premium Income 
Trust. 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: TCW/DW North 
American Government Income Trust, TCW/DW Latin American Growth Fund, TCW/DW 
Income and Growth Fund, TCW/DW Small Cap Growth Fund, TCW/DW Balanced Fund, 
TCW/DW Total Return Trust, TCW/DW Mid-Cap Equity Trust, TCW/DW Global Telecom 
Trust, TCW/DW Emerging Market Opportunities Trust, TCW/DW Term Trust 2000, 
TCW/DW Term Trust 2002 and TCW/DW Term Trust 2003 (the "TCW/DW Funds"). 
InterCapital also serves as (i) administrator of The Black Rock Strategic 
Term Trust Inc., a closed-end investment company; (ii) sub-administrator of 
Templeton Global Governments Income Trust, a closed-end investment company; 
and (iii) investment advisor of Offshore Dividend Growth Fund and Offshore 
Money Market Fund, mutual funds established under the laws of the Cayman 
Islands and available only to investors who are participants in DWR's 
International Active Assets Account program and are neither citizens nor 
residents of the United States. 
    

   Pursuant to an Investment Management Agreement (the "Agreement") with the 
Investment Manager, the Fund has retained the Investment Manager to manage 
the investment of the Fund's assets, including the placing of orders for the 
purchase and sale of portfolio securities. The Investment Manager obtains and 
evaluates such information and advice relating to the economy, securities 
markets, and specific securities as it considers necessary or useful to 
continuously manage the assets of the Fund in a manner consistent with its 
investment objective and policies. 

   Under the terms of the Agreement, in addition to managing the Fund's 
investments, the Investment Manager maintains certain of the Fund's books and 
records and furnishes, at its own expense, such office space, facilities, 
equipment, clerical help, bookkeeping and 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 Agreement. 

   
   Expenses not expressly assumed by the Investment Manager under the 
Agreement or by the Distributor of the Fund's shares, Dean Witter 
Distributors Inc. ("Distributors" or the "Distributor") (see "The 
Distributor"), will be paid by the Fund. These expenses will be allocated 
among the four classes of shares of the Fund (each, a "Class") pro rata based 
on the net assets of the Fund attributable to each Class, except as described 
below. Such expenses include, but are not limited to: expenses of the Plan of 
Distribution pursuant to Rule 12b-1 (the "12b-1 fee") (see "The 
Distributor"); charges and expenses of any registrar, custodian, stock 
transfer and dividend disbursing agent; brokerage commissions; taxes; 
engraving and printing share certificates; registration costs of the Fund and 
its shares under federal and 
    

                                4           
<PAGE>
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 Funds or of the 
Investment Manager (not including compensation or expenses of attorneys who 
are employees of the Investment Manager) and independent accountants; 
membership dues of industry associations; interest on Fund borrowings; 
postage; insurance premiums on property or personnel (including officers and 
Trustees) of the Fund which inure to its benefit; extraordinary expenses 
(including, but not limited to, legal claims and liabilities and litigation 
costs and any indemnification relating thereto); and all other costs of the 
Fund's operation. The 12b-1 fees relating to a particular Class will be 
allocated directly to that Class. In addition, other expenses associated with 
a particular Class (except advisory or custodial fees) may be allocated 
directly to that Class, provided that such expenses are reasonably identified 
as specifically attributable to that Class and the direct allocation to that 
Class is approved by the Trustees. 

   
   As full compensation for the services and facilities furnished to the Fund 
and expenses of the Fund assumed by the Investment Manager, the Fund pays the 
Investment Manager monthly compensation calculated daily by applying the 
following annual rates to the net assets of the Fund determined as of the 
close of each business day: 0.50% of the portion of the daily net assets not 
exceeding $500 million; 0.425% of the portion of the daily net assets 
exceeding $500 million but not exceeding $750 million; 0.375% of the portion 
of the daily net assets exceeding $750 million but not exceeding $1 billion; 
0.35% of the portion of the daily net assets exceeding $1 billion but not 
exceeding $1.25 billion; and 0.325% of the portion of daily net assets 
exceeding $1.25 billion. The management fee is allocated among the Classes 
pro rata based on the net assets of the Fund attributable to each Class. For 
the fiscal years ended December 31, 1995, 1996 and 1997, the Fund accrued to 
the Investment Manager total compensation of $5,608,466, $5,320,578 and 
$5,004,702, 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 in no way restricts the Investment 
Manager from acting as investment manager or adviser to others. 

   The Agreement was initially approved by the Board of Trustees on February 
21, 1997 and by the shareholders of the Fund at a Special Meeting of 
Shareholders held on May 21, 1997. The Agreement is substantially identical 
to a prior investment management agreement which was initially approved by 
the Board of Trustees on October 30, 1992 and by the shareholders of the Fund 
at a Special Meeting of Shareholders held on January 12, 1993. The Agreement 
took effect on May 31, 1997 upon the consummation of the merger of Dean 
Witter, Discover & Co. with Morgan Stanley Group Inc. The Agreement may be 
terminated at any time, without penalty, on thirty days notice, by the Board 
of Trustees of the Fund, by the holders of a majority, as defined in the 
Investment Company Act of 1940, as amended (the "Act"), of the outstanding 
shares of the Fund, or by the Investment Manager. The Agreement will 
automatically terminate in the event of its assignment (as defined in the 
Act). 

   Under its terms, the Agreement has an initial term ending April 30, 1999 
and will continue 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 
Independent Trustees, which vote must be cast in person at a meeting called 
for the purpose of voting on such approval. 

                                5           
<PAGE>
   
   The following owned 5% or more of the outstanding shares of Class A of the 
Fund on April 1, 1998: Morgan Stanley Dean Witter Trust FSB as Trustee FBO 
Richard K. Allen and Dorothy B. Allen, PO Box 503, Jersey City, NJ 
07311-3977--14.41%; Jack Biegger and Shirley Biegger as Trustees for the Jack 
Biegger revocable Living Trust, 20 Wild Dunes Court, Las Vegas, Nevada 
89113--13.08%; and Sharon R. Frank, 210 West Grant #306, Minneapolis, MN 
55403-2244--13.03%. The following owned 5% or more of the outstanding shares 
of Class C of the Fund on April 1, 1998: Robert P. Scurich, PO Box 502, 
Glenbrook, NV 89413-0502--13.441%; Billy R. Bryant and Gail A. Bryant; JT 
TEN, 1264 Fish Hook Way, Ponte Vedra Beach, FL 32082-2517--8.318%; Donald W. 
Dalrymple and Marcia Bresee Dalrymple JTWROS, 2801 34th Pl NW, Washington DC 
20007-1406--5.362%; Miriam M. Zakon, 51 Mignon Road, West Newton, MA 
02165-2630--5.265%; and Roney Buffman and Lou Buffman JT TEN, c/o Cartier 
Caesars Palace, 3570 S. Las Vegas Blvd, Las Vegas, NV 89109-8924--5.26%. 
    

   The Fund has acknowledged that the name "Dean Witter" is a property right 
of DWR. The Fund has agreed that DWR or its parent company may use or, at any 
time, permit others to use, the name "Dean Witter." The Fund has also agreed 
that in the event the Agreement is terminated, or if the affiliation between 
InterCapital and its parent company is terminated, the Fund will eliminate 
the name "Dean Witter" from its name if DWR or its parent company shall so 
request. 

TRUSTEES AND OFFICERS 
- ----------------------------------------------------------------------------- 

   
   The Trustees and Executive Officers of the Fund, their principal business 
occupations during the last five years and their affiliations, if any, with 
InterCapital, and with the 86 Dean Witter Funds and the 11 TCW/DW Funds, are 
shown below. 
    

   
<TABLE>
<CAPTION>
  NAME, AGE, POSITION WITH FUND AND ADDRESS          PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS 
- --------------------------------------------  ---------------------------------------------------------- 
<S>                                          <C>
Michael Bozic (57)                            Chairman and Chief Executive Officer of Levitz Furniture 
Trustee                                       Corporation (since November, 1995); Director or Trustee of the 
c/o Levitz Furniture Corporation              Dean Witter Funds; formerly President and Chief Executive Officer 
7887 N. Federal Hwy.                          of Hills Department Stores (May, 1991-July, 1995); formerly 
Boca Raton, Florida                           variously Chairman, Chief Executive Officer, President and Chief 
                                              Operating Officer (1987-1991) of the Sears Merchandise Group 
                                              of Sears, Roebuck and Co.; Director of Eaglemark Financial 
                                              Services, Inc. and Weirton Steel Corporation. 

Charles A. Fiumefreddo* (64)                  Chairman, Chief Executive Officer and Director of InterCapital, 
Trustee, Chairman, President and Chief        Distributors and DWSC; Executive Vice President and Director 
Executive Officer                             of DWR; Chairman, Director or Trustee, President and Chief 
Two World Trade Center                        Executive Officer of the Dean Witter Funds; Chairman, Chief 
New York, New York                            Executive Officer and Trustee of the TCW/DW Funds; Chairman 
                                              and Director of Morgan Stanley Dean Witter Trust FSB ("MSDW 
                                              Trust"); Director and/or officer of various MSDW subsidiaries. 

Edwin J. Garn (65)                            Director or Trustee of the Dean Witter Funds; formerly United 
Trustee                                       States Senator (R-Utah)(1974-1992) and Chairman, Senate Banking 
c/o Huntsman Corporation                      Committee (1980-1986); formerly Mayor of Salt Lake City, Utah 
500 Huntsman Way                              (1972-1974); formerly Astronaut, Space Shuttle Discovery (April 
Salt Lake City, Utah                          12-19, 1985); Vice Chairman, Huntsman Corporation (since January, 
                                              1993); Director of Franklin Covey (time management systems) 
                                              and John Alden Financial Corp. (health insurance), United Space 
                                              Alliance (joint venture between Lockheed Martin and the Boeing 
                                              Company) and Nuskin Asia Pacific (multilevel marketing); member 
                                              of the board of various civic and charitable organizations. 

                                6           
<PAGE>
  NAME, AGE, POSITION WITH FUND AND ADDRESS          PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS 
- --------------------------------------------  ---------------------------------------------------------- 
John R. Haire (73)                            Chairman of the Audit Committee and Chairman of the Committee 
Trustee                                       of the Independent Directors or Trustees and Director or Trustee 
Two World Trade Center                        of the Dean Witter Funds; Chairman of the Audit Committee and 
New York, New York                            Chairman of the Committee of the Independent Trustees and Trustee 
                                              of the TCW/DW Funds; formerly President, Council for Aid to 
                                              Education (1978-1989) and Chairman and Chief Executive Officer 
                                              of Anchor Corporation, an Investment Adviser (1964-1978). 

Wayne E. Hedien (64)                          Retired; Director or Trustee of the Dean Witter Funds (commencing 
Trustee                                       on September 1, 1997); Director of The PMI Group, Inc. (private 
c/o Gordon Altman Butowsky                    mortgage insurance); Trustee and Vice Chairman of The Field 
    Weitzen Shalov & Wein                     Museum of Natural History; formerly associated with the Allstate 
Counsel to the Independent Trustees           Companies (1966-1994), most recently as Chairman of The Allstate 
114 West 47th Street                          Corporation (March, 1993-December, 1994) and Chairman and Chief 
New York, New York                            Executive Officer of its wholly-owned subsidiary, Allstate 
                                              Insurance Company (July, 1989-December, 1994); director of 
                                              various other business and charitable organizations. 

Dr. Manuel H. Johnson (49)                    Senior Partner, Johnson Smick International, Inc., a consulting 
Trustee                                       firm; Co-Chairman and a founder of the Group of Seven Council 
c/o Johnson Smick International, Inc.         (G7C), an international economic commission; Director or Trustee 
1133 Connecticut Avenue, N.W.                 of the Dean Witter Funds; Trustee of the TCW/DW Funds; Director 
Washington, D.C.                              of NASDAQ (since June, 1995); Director of Greenwich Capital 
                                              Markets Inc. (broker-dealer) and NVR, Inc. (home construction); 
                                              Chairman and Trustee of the Financial Accounting Foundation 
                                              (oversight organization for the Financial Accounting Standards 
                                              Board); formerly Vice Chairman of the Board of Governors of 
                                              the Federal Reserve System (1986-1990) and Assistant Secretary 
                                              of the U.S. Treasury. 

Michael E. Nugent (61)                        General Partner, Triumph Capital, L.P., a private investment 
Trustee                                       partnership; Director or Trustee of the Dean Witter Funds; Trustee 
c/o Triumph Capital, L.P.                     of the TCW/DW Funds; formerly Vice President, Bankers Trust 
237 Park Avenue                               Company and BT Capital Corporation (1984-1988); Director of 
New York, New York                            various business organizations. 

Philip J. Purcell* (54)                       Chairman of the Board of Directors and Chief Executive Officer 
Trustee                                       of MSDW, DWR and Novus Credit Services Inc.; Director of 
1585 Broadway                                 InterCapital, DWSC and Distributors; Director or Trustee of 
New York, New York                            the Dean Witter Funds; Director and/or officer of various MSDW 
                                              subsidiaries. 

John L. Schroeder (67)                        Retired; Director or Trustee of the Dean Witter Funds; Trustee 
Trustee                                       of the TCW/DW Funds; Director of Citizens Utilities Company; 
c/o Gordon Altman Butowsky                    Formerly Executive Vice President and Chief Investment Officer 
 Weitzen Shalov & Wein                        of the Home Insurance Company (August, 1991-September, 1995). 
Counsel to the Independent Trustees 
114 West 47th Street 
New York, NY 

                                7           
<PAGE>
  NAME, AGE, POSITION WITH FUND AND ADDRESS          PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS 
- --------------------------------------------  ---------------------------------------------------------- 
Barry Fink (43)                               Senior Vice President (since March, 1997) and Secretary and 
Vice President, Secretary                     General Counsel (since February, 1997) of InterCapital and DWSC; 
 and General Counsel                          Senior Vice President (since March, 1997) and Assistant Secretary 
Two World Trade Center                        and Assistant General Counsel (since February, 1997) of 
New York, New York                            Distributors; Assistant Secretary of DWR (since August, 1996); 
                                              Vice President, Secretary and General Counsel of the Dean Witter 
                                              Funds and the TCW/DW Funds (since February, 1997); previously 
                                              First Vice President (June, 1993-February, 1997), Vice President 
                                              (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. 

James F. Willison (54)                        Senior Vice President of InterCapital; Vice President of various 
Vice President                                Dean Witter Funds. 
Two World Trade Center 
New York, New York 

Joseph R. Arcieri (49)                        Vice President of InterCapital; Vice President of various Dean 
Vice President                                Witter Funds. 
Two World Trade Center 
New York, New York 

Thomas F. Caloia (52)                         First Vice President and Assistant Treasurer of InterCapital 
Treasurer                                     and DWSC; Treasurer of the Dean Witter Funds and the TCW/DW 
Two World Trade Center                        Funds. 
</TABLE>
    
New York, New York [FN]
   
- ---------------
 * Denotes Trustees who are "interested persons" of the Fund, as defined in 
the Act. 

   In addition, Mitchell M. Merin, President and Chief Strategic Officer of 
InterCapital and DWSC, Executive Vice President of Distributors and MSDW 
Trust and Director of MSDW Trust, Executive Vice President and Director of 
DWR, and Director of SPS Transaction Services, Inc. and various other MSDW 
subsidiaries, Robert M. Scanlan, President and Chief Operating Officer of 
InterCapital and DWSC, Executive Vice President of Distributors and MSDW 
Trust and a Director of MSDW Trust, Joseph J. McAlinden, Executive Vice 
President and Chief Investment Officer of InterCapital and a Director of MSDW 
Trust, Robert S. Giambrone, Senior Vice President of InterCapital, DWSC, 
Distributors and MSDW Trust and a Director of MSDW Trust, Peter M. Avelar, 
and Jonathan R. Page, Senior Vice Presidents of InterCapital, Katherine H. 
Stromberg and Gerard J. Lian, Vice Presidents of InterCapital, are Vice 
Presidents of the Fund. Marilyn K. Cranney, First Vice President and 
Assistant General Counsel of InterCapital, and DWSC, and Lou Anne D. McInnis, 
Carsten Otto and Ruth Rossi, Vice Presidents and Assistant General Counsels 
of InterCapital and DWSC, and Frank Bruttomesso and Todd Lebo, staff 
attorneys with InterCapital, are Assistant Secretaries of the Fund. 

THE BOARD OF TRUSTEES, THE INDEPENDENT TRUSTEES, AND THE COMMITTEES 

   The Board of Trustees consists of nine (9) trustees. These same 
individuals also serve as directors or trustees for all of the Dean Witter 
Funds, and are referred to in this section as Trustees. As of the date of 
this Statement of Additional Information, there are a total of 86 Dean Witter 
Funds, comprised of 130 portfolios. As of March 31, 1998, the Dean Witter 
Funds had total net assets of approximately $105.4 billion and more than six 
million shareholders. 

   Seven Trustees (77% of the total number) have no affiliation or business 
connection with InterCapital or any of its affiliated persons and do not own 
any stock or other securities issued by 
    

                                8           
<PAGE>
   
InterCapital's parent company, MSDWD. These are the "disinterested" or 
"independent" Trustees. The other two Trustees (the "management Trustees") 
are affiliated with InterCapital. Four of the seven independent Trustees are 
also Independent Trustees of the TCW/DW Funds. 

   Law and regulation establish both general guidelines and specific duties 
for the Independent Trustees. The Dean Witter Funds seek as Independent 
Trustees individuals of distinction and experience in business and finance, 
government service or academia; these are people whose advice and counsel are 
in demand by others and for whom there is often competition. To accept a 
position on the Funds' Boards, such individuals may reject other attractive 
assignments because the Funds make substantial demands on their time. Indeed, 
by serving on the Funds' Boards, certain Trustees who would otherwise be 
qualified and in demand to serve on bank boards would be prohibited by law 
from doing so. 

   All of the Independent Trustees serve as members of the Audit Committee 
and the Committee of the Independent Trustees. Three of them also serve as 
members of the Derivatives Committee. During the calendar year ended December 
31, 1997, the three Committees held a combined total of seventeen meetings. 
The Committees hold some meetings at InterCapital's offices and some outside 
InterCapital. Management Trustees or officers do not attend these meetings 
unless they are invited for purposes of furnishing information or making a 
report. 

   The Committee of the Independent Trustees is charged with recommending to 
the full Board approval of management, advisory and administration contracts, 
Rule 12b-1 plans and distribution and underwriting agreements; continually 
reviewing Fund performance; checking on the pricing of portfolio securities, 
brokerage commissions, transfer agent costs and performance, and trading 
among Funds in the same complex; and approving fidelity bond and related 
insurance coverage and allocations, as well as other matters that arise from 
time to time. The Independent Trustees are required to select and nominate 
individuals to fill any Independent Trustee vacancy on the Board of any Fund 
that has a Rule 12b-1 plan of distribution. Most of the Dean Witter Funds 
have such a plan. 

   The Audit Committee is charged with recommending to the full Board the 
engagement or discharge of the Fund's independent accountants; directing 
investigations into matters within the scope of the independent accountants' 
duties, including the power to retain outside specialists; reviewing with the 
independent accountants the audit plan and results of the auditing 
engagement; approving professional services provided by the independent 
accountants and other accounting firms prior to the performance of such 
services; reviewing the independence of the independent accountants; 
considering the range of audit and non-audit fees; reviewing the adequacy of 
the Fund's system of internal controls; and preparing and submitting 
Committee meeting minutes to the full Board. 

   Finally, the Board of each Fund has formed a Derivatives Committee to 
establish parameters for and oversee the activities of the Fund with respect 
to derivative investments, if any, made by the Fund. 

DUTIES OF CHAIRMAN OF COMMITTEE OF THE INDEPENDENT TRUSTEES AND AUDIT 
COMMITTEE 

   The Chairman of the Committee of the Independent Trustees and the Audit 
Committee maintains an office at the Funds' headquarters in New York. He is 
responsible for keeping abreast of regulatory and industry developments and 
the Funds' operations and management. He screens and/or prepares written 
materials and identifies critical issues for the Independent Trustees to 
consider, develops agendas for Committee meetings, determines the type and 
amount of information that the Committees will need to form a judgment on 
various issues, and arranges to have that information furnished to Committee 
members. He also arranges for the services of independent experts and 
consults with them in 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, 
    

                                9           
<PAGE>
   
management and other operating contracts of the Funds and, on behalf of the 
Committees, conducts negotiations with the Investment Manager and other 
service providers. In effect, the Chairman of the Committees serves as a 
combination of chief executive and support staff of the Independent Trustees. 

   The Chairman of the Committee of the Independent Trustees and the Audit 
Committee is not employed by any other organization and devotes his time 
primarily to the services he performs as Committee Chairman and Independent 
Trustee of the Dean Witter Funds and as an Independent Trustee and as 
Chairman of the Committee of the Independent Trustees and the Audit Committee 
of the TCW/DW Funds. The current Committee Chairman has had more than 35 
years experience as a senior executive in the investment company industry. 

ADVANTAGES OF HAVING SAME INDIVIDUALS AS INDEPENDENT TRUSTEES FOR ALL DEAN 
WITTER FUNDS 

   The Independent Trustees and the Funds' management believe that having the 
same Independent Trustees for each of the Dean Witter Funds avoids the 
duplication of effort that would arise from having different groups of 
individuals serving as Independent Trustees for each of the Funds or even of 
sub-groups of Funds. They believe that having the same individuals serve as 
Independent Trustees of all the Funds tends to increase their knowledge and 
expertise regarding matters which affect the Fund complex generally and 
enhances their ability to negotiate on behalf of each Fund with the Fund's 
service providers. This arrangement also precludes the possibility of 
separate groups of Independent Trustees arriving at conflicting decisions 
regarding operations and management of the Funds and avoids the cost and 
confusion that would likely ensue. Finally, having the same Independent 
Trustees serve on all Fund Boards enhances the ability of each Fund to 
obtain, at modest cost to each separate Fund, the services of Independent 
Trustees, and a Chairman of their Committees, of the caliber, experience and 
business acumen of the individuals who serve as Independent Trustees of the 
Dean Witter Funds. 

COMPENSATION OF INDEPENDENT TRUSTEES 

   The Fund pays each Independent Trustee an annual fee of $800 plus a per 
meeting fee of $50 for meetings of the Board of Trustees or committees of the 
Board of Trustees attended by the Trustee (the Fund pays the Chairman of the 
Audit Committee an annual fee of $750 and pays the Chairman of the Committee 
of the Independent Trustees an additional annual fee of $1,200). If a Board 
meeting and a Committee meeting, or more than one Committee meeting, take 
place on a single day, the Trustees are paid a single meeting fee by the 
Fund. The Fund also reimburses such Trustees for travel and other 
out-of-pocket expenses incurred by them in connection with attending such 
meetings. Trustees and officers of the Fund who are or have been employed by 
the Investment Manager or an affiliated company receive no compensation or 
expense reimbursement from the Fund. 

   The following table illustrates the compensation paid to the Fund's 
Independent Trustees by the Fund for the fiscal year ended December 31, 1997. 

                              FUND COMPENSATION 
    

   
<TABLE>
<CAPTION>
                                AGGREGATE 
                               COMPENSATION 
NAME OF INDEPENDENT TRUSTEE   FROM THE FUND 
- ---------------------------  --------------- 
<S>                          <C>
Michael Bozic ..............     $ 1,650 
Edwin J. Garn ..............       1,850 
John R. Haire ..............       3,800 
Wayne E. Hedien.............         482 
Dr. Manuel H. Johnson  .....       1,800 
Michael E. Nugent ..........       1,850 
John L. Schroeder...........       1,850 
</TABLE>
    

   
   The following table illustrates the compensation paid to the Fund's 
Independent Trustees for the calendar year ended December 31, 1997 for 
services to the 84 Dean Witter Funds and, in the case of Messrs. Haire, 
Johnson, Nugent and Schroeder, the 14 TCW/DW Funds that were in operation at 
December 31, 1997. With respect to Messrs. Haire, Johnson, Nugent and 
Schroeder, the TCW/DW 
    

                               10           
<PAGE>
   
Funds are included solely because of a limited exchange privilege between 
those Funds and five Dean Witter Money Market Funds. Mr. Hedien's term as 
Director or Trustee of each Dean Witter Fund commenced on September 1, 1997. 
    

          CASH COMPENSATION FROM DEAN WITTER FUNDS AND TCW/DW FUNDS 

   
<TABLE>
<CAPTION>
                                                            FOR SERVICE AS 
                                                              CHAIRMAN OF 
                                                             COMMITTEES OF    FOR SERVICE AS 
                                                              INDEPENDENT      CHAIRMAN OF 
                          FOR SERVICE                         DIRECTORS/      COMMITTEES OF      TOTAL CASH 
                         AS DIRECTOR OR    FOR SERVICE AS    TRUSTEES AND      INDEPENDENT      COMPENSATION 
                          TRUSTEE AND       TRUSTEE AND          AUDIT           TRUSTEES     FOR SERVICES TO 
                        COMMITTEE MEMBER  COMMITTEE MEMBER COMMITTEES OF 84     AND AUDIT      84 DEAN WITTER 
NAME OF                OF 84 DEAN WITTER    OF 14 TCW/DW      DEAN WITTER    COMMITTEES OF 14   FUNDS AND 14 
INDEPENDENT TRUSTEE          FUNDS             FUNDS             FUNDS         TCW/DW FUNDS     TCW/DW FUNDS 
- ---------------------  ----------------- ----------------  ---------------- ----------------  --------------- 
<S>                    <C>               <C>               <C>              <C>               <C>
Michael Bozic ........      $133,602             --               --                --            $133,602 
Edwin J. Garn ........       149,702             --               --                --             149,702 
John R. Haire ........       149,702          $73,725          $157,463          $25,350           406,240 
Wayne E. Hedien.......        39,010             --               --                --              39,010 
Dr. Manuel H. 
 Johnson..............       145,702           71,125             --                --             216,827 
Michael E. Nugent  ...       149,702           73,725             --                --             223,427 
John L. Schroeder ....       149,702           73,725             --                --             223,427 
</TABLE>
    

   
   As of the date of this Statement of Additional Information, 57 of the Dean 
Witter Funds, including the Fund, have adopted a retirement program under 
which an Independent Trustee who retires after serving for at least five 
years (or such lesser period as may be determined by the Board) as an 
Independent Director or Trustee of any Dean Witter Fund that has adopted the 
retirement program (each such Fund referred to as an "Adopting Fund" and each 
such Trustee referred to as an "Eligible Trustee") is entitled to retirement 
payments upon reaching the eligible retirement age (normally, after attaining 
age 72). Annual payments are based upon length of service. Currently, upon 
retirement, each Eligible Trustee is entitled to receive from the Adopting 
Fund, commencing as of his or her retirement date and continuing for the 
remainder of his or her life, an annual retirement benefit (the "Regular 
Benefit") equal to 25.0% of his or her Eligible Compensation plus 0.4166666% 
of such Eligible Compensation for each full month of service as an 
Independent Director or Trustee of any Adopting Fund in excess of five years 
up to a maximum of 50.0% after ten years of service. The foregoing 
percentages may be changed by the Board.(1) "Eligible Compensation" is 
one-fifth of the total compensation earned by such Eligible Trustee for 
service to the Adopting Fund in the five year period prior to the date of the 
Eligible Trustee's retirement. Benefits under the retirement program are not 
secured or funded by the Adopting Funds. 

(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. 
    

                               11           
<PAGE>
   
   The following table illustrates the retirement benefits accrued to the 
Fund's Independent Trustees by the Fund for the fiscal year ended December 
31, 1997 and by the 57 Dean Witter Funds (including the Fund) for the year 
ended December 31, 1997, and the estimated retirement benefits for the Fund's 
Independent Trustees, to commence upon their retirement, from the Fund as of 
December 31, 1997 and from the 57 Dean Witter Funds as of December 31, 1997. 
    

         RETIREMENT BENEFITS FROM THE FUND AND ALL DEAN WITTER FUNDS 

   
<TABLE>
<CAPTION>
                           
                           
                                                             
                                                             
                                 FOR ALL ADOPTING FUNDS                                         
                            -------------------------------                              ESTIMATED ANNUAL  
                               ESTIMATED                        RETIREMENT BENEFITS          BENEFITS       
                                CREDITED                        ACCRUED AS EXPENSES     UPON RETIREMENT(2) 
                                 YEARS          ESTIMATED    ------------------------- ------------------- 
                             OF SERVICE AT    PERCENTAGE OF                 BY ALL       FROM    FROM ALL 
NAME OF INDEPENDENT            RETIREMENT       ELIGIBLE       BY THE      ADOPTING      THE     ADOPTING 
  TRUSTEE                     (MAXIMUM 10)    COMPENSATION      FUND         FUNDS       FUND     FUNDS 
- --------------------------  --------------- ---------------  ---------- -------------  ------- ---------- 
<S>                         <C>             <C>              <C>        <C>            <C>     <C>
Michael Bozic .............        10             50.0%         $ 349      $ 20,499     $  875   $ 47,025 
Edwin J. Garn .............        10             50.0            497        30,878        875     47,025 
John R. Haire .............        10             50.0           (880)(3)   (19,823)(3)  2,211    127,897 
Wayne E. Hedien............         9             42.5              0             0        744     39,971 
Dr. Manuel H. Johnson  ....        10             50.0            210        12,832        875     47,025 
Michael E. Nugent .........        10             50.0            354        22,546        875     47,025 
John L. Schroeder..........         8             41.7            672        39,350        729     39,504 
</TABLE>
    

   
- ------------
(2)    Based on current levels of compensation. Amount of annual benefits also 
       varies depending on the Trustee's elections described in Footnote (1) 
       above. 
(3)    This number reflects the effect of the extension of Mr. Haire's term as 
       Director or Trustee until June 1, 1998. 

   As of the date of this Statement of Additional Information, the aggregate 
number of shares of beneficial interest of the Fund owned by the Fund's 
officers and Trustees as a group was less than 1 percent of the Fund's shares 
of beneficial interest outstanding. 
    

INVESTMENT PRACTICES AND POLICIES 
- ----------------------------------------------------------------------------- 

PORTFOLIO SECURITIES 

   The payment of principal and interest by issuers of certain Municipal 
Bonds and Notes ("Municipal Obligations") purchased by the Fund may be 
guaranteed by letters of credit or other credit facilities offered by banks 
or other financial institutions. Such guarantees will be considered in 
determining whether a Municipal Obligation meets the Fund's investment 
quality requirements. In addition, some issues may contain provisions which 
permit the Fund to demand from the issuer repayment of principal at some 
specified period(s) prior to maturity. 

   Municipal Bonds. Municipal Bonds, as referred to in the Prospectus, are 
debt obligations of a state, its cities, municipalities and municipal 
agencies (all of which are generally referred to as "municipalities") which 
generally have a maturity at the time of issuance of one year or more, and 
the interest from which is, in the opinion of bond counsel, exempt from 
federal income tax. They are issued to raise funds for various public 
purposes, such as construction of a wide range of public facilities, to 
refund outstanding obligations and to obtain funds for general operating 
expenses or to loan to other public institutions and facilities. In addition, 
certain types of industrial development bonds and pollution control bonds are 
issued by or on behalf of public authorities to provide funding for various 
privately operated facilities. 

   Municipal Notes. Municipal Notes are short-term obligations of 
municipalities, generally with a maturity at the time of issuance ranging 
from six months to three years, the interest from which is, in the opinion of 
bond counsel, exempt from federal income tax. The principal types of 
Municipal Notes include tax anticipation notes, bond anticipation notes, 
revenue anticipation notes and project notes, although 

                               12           
<PAGE>
there are other types of Municipal Notes in which the Fund may invest. Notes 
sold in anticipation of collection of taxes, a bond sale or receipt of other 
revenues are usually general obligations of the issuing municipality or 
agency. Project Notes are issued by local agencies and are guaranteed by the 
United States Department of Housing and Urban Development. Such notes are 
secured by the full faith and credit of the United States Government. Project 
Notes are not currently being issued. 

   Municipal Commercial Paper. Municipal Commercial Paper refers to 
short-term obligations of municipalities the interest from which is, in the 
opinion of bond counsel, exempt from federal income tax, and which may be 
issued at a discount and is sometimes referred to as Short-Term Discount 
Notes. Municipal Commercial Paper is likely to be used to meet seasonal 
working capital needs of a municipality or interim construction financing and 
to be paid from general revenues of the municipality or refinanced with 
long-term debt. In most cases, Municipal Commercial Paper is backed by 
letters of credit, lending agreements, note repurchase agreements or other 
credit facility agreements offered by banks or other institutions. 

   Obligations of issuers of Municipal Bonds, Municipal Notes and Municipal 
Commercial Paper are subject to provisions of bankruptcy, insolvency and 
other laws affecting the rights and remedies of creditors, such as the 
Federal Bankruptcy Act, and laws, if any, which may be enacted by Congress or 
any state extending the time for payment of principal or interest, or both, 
or imposing other constraints upon enforcement of such obligations or upon 
municipalities to levy taxes. There is also the possibility that, as a result 
of litigation or other conditions, the power or ability of any one or more 
issuers to pay, when due, principal of and interest on its, or their, 
Municipal Bonds, Municipal Notes and Municipal Commercial Paper may be 
materially affected. 

   Special Investment Considerations. The percentage and rating policies in 
the Prospectus apply at the time of acquisition of a security based upon the 
last previous determination of the Fund's net asset value; any subsequent 
change in any ratings by a rating service or change in percentages resulting 
from market fluctuations or other changes in the amount of total assets will 
not require elimination of any security from the Fund's portfolio until such 
time as the Investment Manager determines that it is practicable to sell the 
security without undue market or tax consequences to the Fund. Therefore, the 
Fund may hold securities which have been downgraded to ratings of Ba or BB or 
lower by Moody's or S&P. Such securities are considered to be speculative 
investments. 

   Furthermore, the Fund does not have any minimum quality rating standard 
for its downgraded or lower-rated investments. As such, the Fund may invest 
in securities rated as low as Caa, Ca or C by Moody's or CCC, CC, C or CI by 
S&P. Bonds rated Caa or Ca by Moody's may already be in default on payment of 
interest or principal, while bonds rated C by Moody's, their lowest bond 
rating, can be regarded as having extremely poor prospects of ever attaining 
any real investment standing. Bonds rated CI by S&P, their lowest bond 
rating, are no longer making interest payments. 

   Because of the special nature of securities which are rated below 
investment grade by national credit rating agencies ("lower-rated 
securities"), the Investment Manager must take account of certain special 
considerations in assessing the risks associated with such investments. For 
example, as the lower rated securities market is relatively new, its growth 
has paralleled a long economic expansion and it has not weathered a recession 
in its present size and form. Therefore, an economic downturn or increase in 
interest rates is likely to have a negative effect on this market and on the 
value of the lower rated securities held by the Fund, as well as on the 
ability of the securities' issuers to repay principal and interest on their 
borrowings. 

   The prices of lower rated securities have been found to be less sensitive 
to changes in prevailing interest rates than higher rated investments, but 
are likely to be more sensitive to adverse economic changes or individual 
corporate developments. During an economic downturn or substantial period of 
rising interest rates, highly leveraged issuers may experience financial 
stress which would adversely affect their ability to service their principal 
and interest payment obligations, to meet their projected business goals or 
to obtain additional financing. If the issuer of a fixed-income security 
owned by the Fund defaults, the Fund may incur additional expenses to seek 
recovery. In addition, periods of economic uncertainty and change can be 
expected to result in an increased volatility of market prices of 

                               13           
<PAGE>
lower rated securities and a concomitant volatility in the net asset value of 
a share of the Fund. Moreover, the market prices of certain of the Fund's 
portfolio securities which are structured as zero coupon securities are 
affected to a greater extent by interest rate changes and thereby tend to be 
more volatile than securities which pay interest periodically and in cash 
(see "Dividends, Distributions and Taxes" for a discussion of the tax 
ramifications of investments in such securities). 

   The secondary market for lower rated securities may be less liquid than 
the markets for higher quality securities and, as such, may have an adverse 
effect on the market prices of certain securities. The limited liquidity of 
the market may also adversely affect the ability of the Fund's Trustees to 
arrive at a fair value for certain lower rated securities at certain times 
and should make it difficult for the Fund to sell certain securities. In 
addition, new laws and potential new laws may have an adverse effect upon the 
value of lower rated securities and a concomitant negative impact upon the 
net asset value of a share of the Fund. 

PORTFOLIO CHARACTERISTICS 

   Variable Rate Obligations. As stated in the Prospectus, the Fund may 
invest in obligations of the type called "variable rate obligations." 

   The interest rate payable on a variable rate obligation is adjusted either 
at predesignated periodic intervals or whenever there is a change in the 
market rate of interest on which the interest rate payable is based. Other 
features may include the right whereby the Fund may demand prepayment of the 
principal amount of the obligation prior to its stated maturity (a "demand 
feature") and the right of the issuer to prepay the principal amount prior to 
maturity. The principal benefit of a variable rate obligation is that the 
interest rate adjustment minimizes changes in the market value of the 
obligation. The principal benefit to the Fund of purchasing obligations with 
a demand feature is that liquidity, and the ability of the Fund to obtain 
repayment of the full principal amount of the obligation prior to maturity, 
is enhanced. 

   When-Issued and Delayed Delivery Securities. As stated in the Prospectus, 
the Fund may purchase tax-exempt securities on a when-issued or delayed 
delivery basis. When such transactions are negotiated, the price is fixed at 
the time of the commitment, but delivery and payment can take place a month 
or more after the date of the commitment. While the Fund will only purchase 
securities on a when-issued or delayed delivery 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 a Municipal Obligation on a when-issued or delayed delivery basis, 
it will record the transaction and thereafter reflect the value, each day, of 
the Municipal Obligation in determining its net asset value. The Fund will 
also establish a segregated account with its custodian bank in which it will 
maintain cash, cash equivalents or other high quality Municipal Obligations 
equal in value to commitments for such when-issued or delayed delivery 
securities. The Fund does not believe that its net asset value or income will 
be adversely affected by its purchase of Municipal Obligations on a 
when-issued or delayed delivery basis. The Fund may sell securities on a 
when-issued or delayed delivery basis provided that the Fund owns the 
security at the time of the sale. 

   Repurchase Agreements. When cash may be available for only a few days, it 
may be invested by the Fund in repurchase agreements until such time as it 
may otherwise be invested or used for payments of obligations of the Fund. 
These agreements, which may be viewed as a type of secured lending by the 
Fund, typically involve the acquisition by the Fund of debt securities from a 
selling financial institution such as a bank, savings and loan association or 
broker-dealer. The agreement provides that the Fund will sell back to the 
institution, and that the institution will repurchase, the underlying 
security ("collateral"), which is held by the Fund's Custodian, at a 
specified price and at a fixed time in the future, usually not more than 
seven days from the date of purchase. The Fund will receive interest from the 
institution until the time when the repurchase is to occur. Although such 
date is deemed by the Fund to be the maturity date of a repurchase agreement, 
the maturities of securities subject to repurchase agreements are not subject 
to any limits and may exceed one year. While repurchase agreements involve 
certain risks not associated with direct investments in debt securities, the 
Fund follows procedures designed to minimize such risks. These procedures 
include effecting repurchase transac- 

                               14           
<PAGE>
   
tions only with large, well-capitalized and well-established financial 
institutions, whose financial condition will be continually monitored by the 
Investment Manager. In addition, the value of the collateral underlying the 
repurchase agreement will always be a least equal to the repurchase price, 
including any accrued interest earned on the repurchase agreement. In the 
event of a default or bankruptcy by a selling financial institution, the Fund 
will seek to liquidate such collateral. However, the exercising of the Fund's 
right to liquidate such collateral could involve certain costs or delays and, 
to the extent that proceeds from any sale upon a default of the obligation to 
repurchase were less than the repurchase price, the Fund could suffer a loss. 
It is the current policy of the Fund not to invest in repurchase agreements 
that do not mature within seven days if any such investment, together with 
any other illiquid assets held by the Fund, amounts to more than 10% of its 
net assets. The Fund's investments in repurchase agreements may at times be 
substantial when, in the view of the Investment Manager, liquidity or other 
considerations warrant. However, the Fund did not enter into any repurchase 
agreements during its fiscal year ended December 31, 1997 and it has no 
intention of entering into any such agreements in the foreseeable future. 
    

FUTURES CONTRACTS AND OPTIONS ON FUTURES 

   As discussed in the Prospectus, the Fund may invest in financial futures 
contracts ("futures contracts") and related options thereon. These futures 
contracts and related options thereon will be used only as a hedge against 
anticipated interest rate changes. A futures contract sale creates an 
obligation by the Fund, as seller, to deliver the specific type of instrument 
called for in the contract at a specified future time for a specified price. 
A futures contract purchase would create an obligation by the Fund, as 
purchaser, to take delivery of the specific type of financial instrument at a 
specified future time at a specified price. The specific securities delivered 
or taken, respectively, at settlement date, would not be determined until on 
or near that date. The determination would be in accordance with the rules of 
the exchange on which the futures contract sale or purchase was effected. 

   Although the terms of futures contracts specify actual delivery or receipt 
of securities, in most instances the contracts are closed out before the 
settlement date without the making or taking of delivery of the securities. 
Closing out of a futures contract is usually effected by entering into an 
offsetting transaction. An offsetting transaction for a futures contract sale 
is effected by the Fund entering into a futures contract purchase for the 
same aggregate amount of the specific type of financial instrument at the 
same delivery date. If the price in the sale exceeds the price in the 
offsetting purchase, the Fund is immediately paid the difference and thus 
realizes a gain. If the offsetting purchase price exceeds the sale price, the 
Fund pays the difference and realizes a loss. Similarly, the closing out of a 
futures contract purchase is effected by the Fund entering into a futures 
contract sale. If the offsetting sale price exceeds the purchase price the 
Fund realizes a gain, and if the offsetting sale price is less than the 
purchase price the Fund realizes a loss. 

   Unlike a futures contract, which requires the parties to buy and sell a 
security on a set date, an option on a futures contract entitles its holder 
to decide on or before a future date whether to enter into such a contract (a 
long position in the case of a call option and a short position in the case 
of a put option). If the holder decides not to enter into the contract, the 
premium paid for the contract is lost. Since the value of the option is fixed 
at the point of sale, there are no daily payments of cash to reflect the 
change in the value of the underlying contract, as discussed below for 
futures contracts. The value of the option changes is reflected in the net 
asset value of the Fund. 

   The Fund is required to maintain margin deposits with brokerage firms 
through which it effects futures contracts and options thereon. The initial 
margin requirements vary according to the type of the underlying security. In 
addition, due to current industry practice, daily variations in gains and 
losses on open contracts are required to be reflected in cash in the form of 
variation margin payments. The Fund may be required to make additional margin 
payments during the term of the contract. 

   Currently, futures contracts can be purchased on debt securities such as 
U.S. Treasury Bills and Bonds, U.S. Treasury Notes with maturities between 
6 1/2 and 10 years, Certificates of the Government 

                               15           
<PAGE>
National Mortgage Association, Bank Certificates of Deposit and on a 
municipal bond index (see below). The Fund may invest in interest rate 
futures contracts covering these types of financial instruments as well as in 
new types of contracts that become available in the future. 

   Financial futures contracts are traded in an auction environment on the 
floors of several Exchanges--principally, the Chicago Board of Trade, the 
Chicago Mercantile Exchange and the New York Futures Exchange. Each Exchange 
guarantees performance under contract provisions through a clearing 
corporation, a nonprofit organization managed by the Exchange membership 
which is also responsible for handling daily accounting of deposits or 
withdrawals of margin. 

   A risk in employing futures contracts to protect against the price 
volatility of portfolio securities is that the prices of securities subject 
to futures contracts may correlate imperfectly with the behavior of the cash 
prices of the Fund's portfolio securities. The correlation may be distorted 
by the fact that the futures market is dominated by short-term traders 
seeking to profit from the difference between a contract or security price 
objective and their cost of borrowed funds. This would reduce the value of 
futures contracts for hedging purposes over a short time period. The 
correlation may be further distorted since the futures contracts that are 
being used to hedge are not based on municipal obligations. 

   Another risk is that the Fund's Investment Manager could be incorrect in 
its expectations as to the direction or extent of various interest rate 
movements or the time span within which the movements take place. For 
example, if the Fund sold futures contracts for the sale of securities in 
anticipation of an increase in interest rates, and then interest rates went 
down instead, causing bond prices to rise, the Fund would lose money on the 
sale. 

   Put and call options on financial futures have characteristics similar to 
Exchange traded options. For a further description of options, see below and 
the Prospectus. 

   In addition to the risks associated in investing in options on securities, 
there are particular risks associated with investing in options on futures. 
In particular, the ability to establish and close out positions on such 
options will be subject to the development and maintenance of a liquid 
secondary market. It is not certain that such a market will develop. 

   The Fund may not enter into futures contracts or related options theron 
if, immediately thereafter, the amount committed to margin plus the amount 
paid for option premiums exceeds 5% of the value of the Fund's total assets. 
In instances involving the purchase of futures contracts by the Fund, an 
amount equal to the market value of the futures contract will be deposited in 
a segregated account of cash and cash equivalents to collateralize the 
position and thereby ensure that the use of such futures is unleveraged. The 
Fund may not purchase or sell futures contracts or related options if, 
immediately thereafter, more than one-third of its net assets would be 
hedged. 

   Municipal Bond Index Futures--The Fund may utilize municipal bond index 
futures contracts and options thereon for hedging purposes. The Fund's 
strategies in employing such contracts will be similar to that discussed 
above with respect to financial futures and options thereon. A municipal bond 
index is a method of reflecting in a single number the market value of many 
different municipal bonds and is designed to be representative of the 
municipal bond market generally. The index fluctuates in response to changes 
in the market values of the bonds included within the index. Unlike futures 
contracts on particular financial instruments, futures contracts on a 
municipal bond index will be settled in cash if held until the close of 
trading in the contract. However, as in any other futures contract, a 
position in the contract may be closed out by purchase or sale of an 
offsetting contract for the same delivery month prior to expiration of the 
contract. 

   Options--The Fund may purchase or sell (write) options on debt securities 
as a means of achieving additional return or hedging the value of the Fund's 
portfolio. The Fund will only buy options listed on national securities 
exchanges. The Fund will not purchase options if, as a result, the aggregate 
cost of all outstanding options exceeds 10% of the Fund's total assets. 

   Presently there are no options on tax-exempt securities traded on national 
securities exchanges and until such time as they become available, the Fund 
will not invest in options on debt securities. 

                               16           
<PAGE>
   A call option is a contract that gives the holder of the option the right 
to buy from the writer of the call option, in return for a premium, the 
security underlying the option at a specified exercise price at any time 
during the term of the option. The writer of the call option has the 
obligation, upon exercise of the option, to deliver the underlying security 
upon payment of the exercise price during the option period. A put option is 
a contract that gives the holder of the option the right to sell to the 
writer, in return for a premium, the underlying security at a specified price 
during the term of the option. The writer of the put has the obligation to 
buy the underlying security upon exercise, at the exercise price during the 
option period. 

   The Fund will only write covered call or covered put options listed on 
national exchanges. The Fund may not write covered options in an amount 
exceeding 20% of the value of its total assets. A call option is "covered" if 
the Fund owns the underlying security covered by the call or has an absolute 
and immediate right to acquire that security or futures contract without 
additional cash consideration (or for additional cash consideration held in a 
segregated account by its custodian) upon conversion or exchange of other 
securities held in its portfolio. A call option is also covered if the Fund 
holds a call on the same security or futures contract as the call written, 
where the exercise price of the call held is (i) equal to or less than the 
exercise price of the call written or (ii) greater than the exercise price of 
the call written if the difference is maintained by the Fund in cash, 
Treasury bills or other liquid portfolio securities in a segregated account 
with its custodian. A put option is "covered" if the Fund maintains cash, 
Treasury bills or other high grade short-term obligations with a value equal 
to the exercise price in a segregated account with its custodian, or else 
holds a put on the same security or futures contract as the put written where 
the exercise price of the put held is equal to or greater than the exercise 
price of the put written. 

   If the Fund has written an option, it may terminate its obligation by 
effecting a closing purchase transaction. This is accomplished by purchasing 
an option of the same series as the option previously written. However, once 
the Fund has been assigned an exercise notice, the Fund will be unable to 
effect a closing purchase transaction. Similarly, if the Fund is the holder 
of an option, it may liquidate its position by effecting a closing sale 
transaction. This is accomplished by selling an option of the same series as 
the option previously purchased. There can be no assurance that either a 
closing purchase or sale transaction can be effected when the Fund so 
desires. 

   The Fund will realize a profit from a closing transaction if the price of 
the transaction is less than the premium received from writing the option or 
is more than the premium paid to purchase the option; the Fund will realize a 
loss from a closing transaction if the price of the transaction is more than 
the premium received from writing the option or is less than the premium paid 
to purchase the option. Since call option prices generally reflect increases 
in the price of the underlying security, any loss resulting from the purchase 
of a call option may also be wholly or partially offset by unrealized 
appreciation of the underlying security. If a put option written by the Fund 
is exercised, the Fund may incur a loss equal to the difference between the 
exercise price of the option and the sum of the sale price of the underlying 
security plus the premiums received from the sale of the option. Other 
principal factors affecting the market value of a put or a call option 
include supply and demand, interest rates, the current market price and price 
volatility of the underlying security and the time remaining until the 
expiration date. 

   An option position may be closed out only on an exchange which provides a 
secondary market for an option of the same series. Although the Fund will 
generally purchase or write only those options for which there appears to be 
an active secondary market, there is no assurance that a liquid secondary 
market on an exchange will exist for any particular option. In such event, it 
might not be possible to effect closing transactions in particular options, 
so that the Fund would have to exercise its options in order to realize any 
profit and would incur brokerage commissions upon the exercise of call 
options and upon the subsequent disposition of underlying securities for the 
exercise of put options. If the Fund as a covered call option writer is 
unable to effect a closing purchase transaction in a secondary market, it 
will not be able to sell the underlying security until the option expires or 
it delivers the underlying security upon exercise. 

PORTFOLIO MANAGEMENT 

   The Fund may engage in short-term trading consistent with its investment 
objective. Securities may be sold in anticipation of a market decline (a rise 
in interest rates) or purchased in anticipation of a market 

                               17           
<PAGE>
rise (a decline in interest rates). In addition, a security may be sold and 
another security of comparable equality purchased at approximately the same 
time to take advantage of what the Investment Manager believes to be a 
temporary disparity in the normal yield relationship between the two 
securities. These yield disparities may occur for reasons not directly 
related to the investment quality of particular issues or the general 
movement of interest rates, such as changes in the overall demand for, or 
supply of, various types of tax-exempt securities. 

   In general, purchases and sales may also be made to restructure the 
portfolio in terms of average maturity, quality, coupon yield, or 
diversification for any one or more of the following purposes: (a) to 
increase income, (b) to improve portfolio quality, (c) to minimize capital 
depreciation, (d) to realize gains or losses, or for such other reasons as 
the Investment Manager deems relevant in light of economic and market 
conditions. 

   The Fund may invest in obligations customarily sold to institutional 
investors in private transactions with the issuers thereof and up to 5% of 
its total assets in securities for which a bona fide market does not exist at 
the time of purchase. With respect to any securities as to which a bona fide 
market does not exist, the Fund may be unable to dispose of such securities 
promptly at reasonable prices. 

   The Fund does not generally intend to invest more than 25% of its total 
assets in securities of any one governmental unit or in the securities of 
governmental units located in any one state, territory or possession of the 
United States. Subject to investment restriction number 3 disclosed in the 
Prospectus under the Section "Investment Restrictions," the Fund may invest 
more than 25% of its total assets in industrial development and pollution 
control bonds (two kinds of tax-exempt Municipal Bonds). 

INVESTMENT RESTRICTIONS 
- ----------------------------------------------------------------------------- 

   In addition to the investment restrictions enumerated in the Prospectus, 
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 provided further that a guarantee of a 
security shall not be deemed to be a security issued by the guarantor if the 
value of all securities issued or guaranteed by the guarantor and owned by 
the Fund does not exceed 10% of the value of the total assets of the Fund; 
(b) a "taxable security" is any security the interest on which is subject to 
federal income tax; and (c) all percentage limitations apply immediately 
after a purchase or initial investment, and any subsequent change in any 
applicable percentage resulting from market fluctuations or other changes in 
the amount of total or net assets does not require elimination of any 
security from the portfolio. 

   The Fund may not: 

     1. Invest in common stock. 

     2. Invest in securities of any issuer if, to the knowledge of the Fund, 
    any officer or trustee/director of the Fund or of the Investment Manager 
    owns more than 1/2 of 1% of the outstanding securities of such issuer, and 
    such officers and trustees/directors who own more than 1/2 of 1% own in 
    the aggregate more than 5% of the outstanding securities of such issuer. 

     3. Purchase or sell real estate or interests therein, although it may 
    purchase securities secured by real estate or interests therein. 

     4. Purchase or sell commodities except that the Fund may purchase or sell 
    financial futures contracts and related options thereon. 

     5. Purchase oil, gas or other mineral leases, rights or royalty 
    contracts, or exploration or development programs. 

                               18           
<PAGE>
     6. Write, purchase or sell puts, calls, or combinations thereof, except 
    for options on futures contracts or options on debt securities. 

     7. Purchase securities of other investment companies, except in 
    connection with a merger, consolidation, reorganization or acquisition of 
    assets. 

     8. Borrow money, except that the Fund may borrow from a bank for 
    temporary or emergency purposes in amounts not exceeding 5% (taken at the 
    lower of cost or current value) of the value of its total assets (not 
    including the amount borrowed). 

     9. Pledge its assets or assign or otherwise encumber them except to 
    secure borrowing effected within the limitations set forth in Restriction 
    8. However, for the purpose of this restriction, collateral arrangements 
    with respect to the writing of options and collateral arrangements with 
    respect to initial margin for futures are not deemed to be pledges of 
    assets. 

     10. Issue senior securities as defined in the Act, except insofar as the 
    Fund may be deemed to have issued a senior security by reason of: (a) 
    entering into any repurchase agreement; (b) purchasing any securities on a 
    when-issued or delayed delivery basis; (c) purchasing or selling any 
    financial futures contracts; (d) borrowing money in accordance with 
    restrictions described above; or (e) lending portfolio securities. 

     11. Make loans of money or securities, except: (a) by the purchase of 
    debt obligations in which the Fund may invest consistent with its 
    investment objective and policies; and (b) by investment in repurchase 
    agreements. 

     12. Make short sales of securities. 

     13. Purchase securities on margin, except for such short-term loans as 
    are necessary for the clearance of purchases of portfolio securities. 

     14. Engage in the underwriting of securities, except insofar as the Fund 
    may be deemed an underwriter under the Securities Act of 1933 in disposing 
    of a portfolio security. 

     15. Invest for the purpose of exercising control or management of any 
    other issuer. 

   Notwithstanding any other investment policy or restriction, the Fund may 
seek to achieve its investment objective by investing all or substantially 
all of its assets in another investment company having substantially the same 
investment objective and policies as the Fund. 

PORTFOLIO TRANSACTIONS AND BROKERAGE 
- ----------------------------------------------------------------------------- 

   
   Subject to the general supervision of the Board of Trustees, the 
Investment Manager is responsible for decisions to buy and sell securities 
and futures contracts for the Fund, the selection of brokers and dealers to 
effect the transactions, and the negotiation of brokerage commissions, if 
any. The Fund expects that the primary market for the securities in which it 
intends to invest will generally be the over-the-counter market. Securities 
are generally traded in the over-the-counter market on an "net" basis with 
dealers acting as principal for their own account without charging a stated 
commission, although the price of the security usually includes a profit to 
the dealer. Options and futures transactions will usually be effected through 
a broker and a commission will be charged. The Fund also expects that 
securities will be purchased at times in underwritten offerings, where the 
price includes a fixed amount of compensation, generally referred to as the 
underwriter's concession or discount. On occasion, the Fund may also purchase 
certain money market instruments directly from an issuer, in which case no 
commissions or discounts are paid. During the fiscal years ended December 31, 
1995, 1996 and 1997, the Fund paid no 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 

                               19           
<PAGE>
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 and 
futures contracts for its portfolio is that primary consideration will be 
given to obtaining the most favorable prices and efficient execution of 
transactions. Consistent with this policy, when securities transactions are 
effected on a stock exchange, the Fund's policy is to pay commissions which 
are considered fair and reasonable without necessarily determining that the 
lowest possible commissions are paid in all circumstances. The Fund believes 
that a requirement always to seek the lowest commission cost could impede 
effective portfolio management and preclude the Fund and the Investment 
Manager from obtaining a high quality of brokerage and research services. In 
seeking to determine the reasonableness of brokerage commissions paid in any 
transaction, the Investment Manager relies upon its experience and knowledge 
regarding commissions generally charged by various brokers and on its 
judgment in evaluating the brokerage and research services received from the 
broker effecting the transaction. Such determinations are necessarily 
subjective and imprecise, as in most cases an exact dollar value for those 
services is not ascertainable. 

   
   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 who are capable of 
providing efficient executions. If the Investment Manager believes such price 
and execution 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 all cases 
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 thus 
reduce its expenses, it is of indeterminable value and the management fee 
paid to the Investment Manager is not reduced 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 and 
Government Agency Securities, Bank Money Instruments (i.e., Certificates of 
Deposit and Bankers' Acceptances) and Commercial Paper (not including 
Tax-Exempt Municipal Paper). Such transactions will be effected with DWR only 
when the price available from DWR is better than that available from other 
dealers. During the fiscal years ended December 31, 1995, 1996 and 1997, the 
Fund did not effect any principal transactions with DWR. 

   Consistent with the policy described above, brokerage transactions in 
securities listed on exchanges or admitted to unlisted trading privileges may 
be effected through DWR, Morgan Stanley & Co. Incorporated and other 
affiliated brokers and dealers. In order for an affiliated broker or dealer 
to effect portfolio transactions for the Fund, the commissions, fees or other 
remuneration received by the affiliated broker or dealer must be reasonable 
and fair compared to the commissions, fees or other remuneration paid to 
other brokers in connection with comparable transactions involving similar 
securities being purchased or sold on an exchange during a comparable period 
of time. This standard would allow the affiliated broker or dealer to receive 
no more than the remuneration which would be expected to be 
    

                               20           
<PAGE>
   
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 an affiliated broker or dealer are consistent with the 
foregoing standard. The Fund did not effect any securities transactions 
through any affiliated brokers or dealers during its fiscal years ended 
December 31, 1995, 1996 and 1997. 
    

THE DISTRIBUTOR 
- ----------------------------------------------------------------------------- 

   
   As discussed in the Prospectus, shares of the Fund are distributed by Dean 
Witter Distributors Inc. (the "Distributor"). The Distributor has entered 
into a selected dealer agreement with DWR, which through its own sales 
organization sells shares of the Fund. In addition, the Distributor may enter 
into selected dealer agreements with other selected broker-dealers. The 
Distributor, a Delaware corporation, is a wholly-owned subsidiary of MSDW. 
The Trustees of the Fund, including a majority of the Trustees who are not, 
and were not at the time they voted, interested persons of the Fund, as 
defined in the Act (the "Independent Trustees"), approved, at their meeting 
held on June 30, 1997, the current Distribution Agreement appointing the 
Distributor as exclusive distributor of the Fund's shares and providing for 
the Distributor to bear distribution expenses not borne by the Fund. By its 
terms, the Distribution Agreement has an initial term ending April 30, 1998 
and will remain in effect from year to year thereafter if approved by the 
Board. 
    

   The Distributor bears all expenses it may incur 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. The Fund bears 
the costs of initial typesetting, printing and distribution of prospectuses 
and supplements thereto to shareholders. The Fund also bears the costs of 
registering the Fund and its shares under federal securities laws and pays 
filing fees in accordance with state securities laws. The Fund and the 
Distributor have agreed to indemnify each other against certain liabilities, 
including liabilities under the Securities Act of 1933, as amended. Under the 
Distribution Agreement, the Distributor uses its best efforts in rendering 
services to the Fund, but in the absence of willful misfeasance, bad faith, 
gross negligence or reckless disregard of its obligations, the Distributor is 
not liable to the Fund or any of its shareholders for any error of judgment 
or mistake of law or for any act or omission or for losses sustained by the 
Fund or its shareholders. 

PLAN OF DISTRIBUTION 

   
   Effective July 28, 1997, the Fund has adopted a Plan of Distribution 
pursuant to Rule 12b-1 under the Act (the "Plan") pursuant to which each 
Class, other than Class D, pays the Distributor compensation accrued daily 
and payable monthly at the following annual rates: 0.25%, 0.60% and 0.70% of 
the average daily net assets of Class A, Class B and Class C, respectively. 
The Distributor also receives the proceeds of front-end sales charges and of 
contingent deferred sales charges imposed on certain redemptions of shares, 
which are separate and apart from payments made pursuant to the Plan (see 
"Purchase of Fund Shares" in the Prospectus). The Distributor has informed 
the Fund that it and/or DWR received (a) approximately $972,000, $1,050,000 
and $448,316 in front-end sales charges from the Fund for the fiscal years 
ended December 31, 1995 and 1996 and for the period January 1, 1997 through 
July 27, 1997, respectively, (b) approximately $0, $10,314 and $530 in 
contingent deferred sales charges from Class A, Class B and Class C, 
respectively, for the fiscal year ended December 31, 1997, and (c) 
approximately $69,207 in front-end sales charges from Class A for the fiscal 
year ended December 31, 1997, none of which was retained by the Distributor. 
    

   The Distributor has informed the Fund that the entire fee payable by Class 
A and a portion of the fees payable by each of Class B and Class C each year 
pursuant to the Plan equal to 0.15% of the average 

                               21           
<PAGE>
daily net assets of Class B and 0.25% of the average daily net assets of 
Class C are currently each characterized as a "service fee" under the Rules 
of the Association of the National Association of Securities Dealers, Inc. 
(of which the Distributor is a member). The "service fee" is a payment made 
for personal service and/or the maintenance of shareholder accounts. The 
remaining portion of the Plan fees payable by a Class, if any, is 
characterized as an "asset-based sales charge" as such is defined by the 
aforementioned Rules of the Association. 

   The Plan was adopted by a majority vote of the Board of Trustees, 
including all of the Trustees of the Fund who are not "interested persons" of 
the Fund (as defined in the Act) and who have no direct or indirect financial 
interest in the operation of the Plan (the "Independent 12b-1 Trustees"), 
cast in person at a meeting called for the purpose of voting on the Plan, on 
June 30, 1997. 

   Under its terms, the Plan has an initial term ending April 30, 1998 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. 

   
   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 under the Plan and the 
purpose for which such expenditures were made. For the fiscal period July 28 
through December 31, 1997, Class A, Class B, and Class C shares of the Fund 
accrued payments under the plan amounting to $2,466, $83,261, and $4,834, 
respectively, which amounts are equal to 0.25%, 0.60%, and 0.70% of the 
average daily net assets of Class A, Class B, and Class C, respectively, for 
such period. 
    

   The Plan was adopted in order to permit the implementation of the Fund's 
method of distribution. Under this distribution method the Fund offers four 
Classes of shares, each with a different distribution arrangement as set 
forth in the Prospectus. 

   With respect to Class A shares, DWR compensates its account executives by 
paying them, from proceeds of the front-end sales charge, commissions for the 
sale of Class A shares, currently a gross sales credit of up to 4.0% of the 
amount sold (except as provided in the following sentence) and an annual 
residual commission, currently a residual of up to 0.15% of the current value 
of the respective accounts for which they are the account executives or 
dealers of record in all cases. On orders of $1 million or more (for which no 
sales charge was paid), the Investment Manager compensates DWR's account 
executives by paying them, from its own funds, a gross sales credit of 1.0% 
of the amount sold. 

   With respect to Class B shares, DWR compensates its account executives by 
paying them, from its own funds, commissions for the sale of Class B shares, 
currently a gross sales credit of up to 4.0% of the amount sold and an annual 
residual commission, currently a residual of up to 0.15% of the current value 
of the respective accounts for which they are the account executives of 
record. 

   With respect to Class C shares, DWR compensates its account executives by 
paying them, from its own funds, commissions for the sale of Class C shares, 
currently a gross sales credit of up to 1.0% of the amount sold and an annual 
residual commission, currently a residual of up to 0.70% of the current value 
of the respective accounts for which they are the account executives of 
record. 

   With respect to Class D shares other than shares held by participants in 
the InterCapital mutual fund asset allocation program, the Investment Manager 
compensates DWR's account executives by paying them, from its own funds, 
commissions for the sale of Class D shares, currently a gross sales credit of 
up to 1.0% of the amount sold. There is a chargeback of 100% of the amount 
paid if the Class D shares are redeemed in the first year and a chargeback of 
50% of the amount paid if the Class D shares are redeemed in the second year 
after purchase. The Investment Manager also compensates DWR's account 
executives by paying them, from its own funds, an annual residual commission, 
currently a residual of up to 0.10% of the current value of the respective 
accounts for which they are the account executives of record (not including 
accounts of participants in the InterCapital mutual fund asset allocation 
program). 

   The gross sales credit is a charge which reflects commissions paid by DWR 
to its account executives and DWR's Fund-associated distribution-related 
expenses, including sales compensation, 

                               22           
<PAGE>
and overhead and other branch office distribution-related expenses including 
(a) the expenses of operating DWR's branch offices in connection with the 
sale of Fund shares, including lease costs, the salaries and employee 
benefits of operations and sales support personnel, utility costs, 
communications costs and the costs of stationery and supplies, (b) the costs 
of client sales seminars, (c) travel expenses of mutual fund sales 
coordinators to promote the sale of Fund shares and (d) other expenses 
relating to branch promotion of Fund sales. The distribution fee that the 
Distributor receives from the Fund under the Plan, in effect, offsets 
distribution expenses incurred under the Plan on behalf of the Fund and, in 
the case of Class B shares, opportunity costs, such as the gross sales credit 
and an assumed interest charge thereon ("carrying charge"). In the 
Distributor's reporting of the distribution expenses to the Fund, in the case 
of Class B shares, such assumed interest (computed at the "broker's call 
rate") has been calculated on the gross credit as it is reduced by amounts 
received by the Distributor under the Plan and any contingent deferred sales 
charges received by the Distributor upon redemption of shares of the Fund. No 
other interest charge is included as a distribution expense in the 
Distributor's calculation of its distribution costs for this purpose. The 
broker's call rate is the interest rate charged to securities brokers on 
loans secured by exchange-listed securities. 

   The Fund is authorized to reimburse expenses incurred or to be incurred in 
promoting the distribution of the Fund's Class A and Class C shares and in 
servicing shareholder accounts. Reimbursement will be made through payments 
at the end of each month. The amount of each monthly payment may in no event 
exceed an amount equal to a payment at the annual rate of 0.25%, in the case 
of Class A, and 0.70%, in the case of Class C, of the average net assets of 
the respective Class during the month. No interest or other financing 
charges, if any, incurred on any distribution expenses on behalf of Class A 
and Class C will be reimbursable under the Plan. With respect to Class A, in 
the case of all expenses other than expenses representing the service fee, 
and, with respect to Class C, in the case of all expenses other than expenses 
representing a gross sales credit or a residual to account executives, such 
amounts shall be determined at the beginning of each calendar quarter by the 
Trustees, including, a majority of the Independent 12b-1 Trustees. Expenses 
representing the service fee (for Class A) or a gross sales credit or a 
residual to account executives (for Class C) may be reimbursed without prior 
determination. In the event that the Distributor proposes that monies shall 
be reimbursed for other than such expenses, then in making quarterly 
determinations of the amounts that may be reimbursed by the Fund, the 
Distributor will provide and the Trustees will review a quarterly budget of 
projected distribution expenses to be incurred on behalf of the Fund, 
together with a report explaining the purposes and anticipated benefits of 
incurring such expenses. The Trustees will determine which particular 
expenses, and the portions thereof, that may be borne by the Fund, and in 
making such a determination shall consider the scope of the Distributor's 
commitment to promoting the distribution of the Fund's Class A and Class C 
shares. 

   
   Each Class paid 100% of the amounts accrued under the Plan with respect to 
that Class for the fiscal year ended December 31, 1997 to the Distributor. 
The Distributor and DWR estimate that they have spent, pursuant to the Plan, 
$2,825,759 on behalf of Class B since the inception of the Plan. It is 
estimated that this amount was spent in approximately the following ways: (i) 
2.25%, ($63,695)--advertising and promotional expenses; (ii) 0%, 
($29)--printing of prospectuses for distribution to other than current 
shareholders; and (iii) 97.75% ($2,762,035)--other expenses, including the 
gross sales credit and the carrying charge, of which .08% ($2,328) represents 
carrying charges, 4.45% ($122,925) represents commission credits to DWR 
branch offices for payments of commissions to account executives and 6.57% 
($181,346) represents overhead and other branch office distribution-related 
expenses. The amounts accrued by Class A and Class C for distribution during 
the fiscal period July 28 through December 31, 1997 were for expenses which 
relate to compensation of sales personnel and associated overhead expenses. 

   In the case of Class B shares, at any given time, the expenses of 
distributing shares of the Fund may be more or less than the total of (i) the 
payments made by the Fund pursuant to the Plan and (ii) the proceeds of 
contingent deferred sales charges paid by investors upon redemption of 
shares. The Distributor has advised the Fund that in the case of Class B 
shares the excess distribution expenses, 
    

                               23           
<PAGE>
   
including the carrying charge designed to approximate the opportunity costs 
incurred by DWR which arise from it having advanced monies without having 
received the amount of any sales charges imposed at the time of sale of the 
Fund's Class B shares, totalled $2,732,178 as of December 31, 1997. Of this 
amount, $2,455,436 represents excess distribution expenses of Dean Witter 
National Municipal Trust ("National Municipal"), the net assets of which were 
combined with those of the Fund on November 7, 1997 pursuant to an Agreement 
and Plan of Reorganization (the "Reorganization"). Because there is no 
requirement under the Plan that the Distributor be reimbursed for all 
distribution expenses with respect to Class B shares or any requirement that 
the Plan be continued from year to year, this excess amount does not 
constitute a liability of the Fund. Although there is no legal obligation for 
the Fund to pay expenses incurred in excess of payments made to the 
Distributor under the Plan and the proceeds of contingent deferred sales 
charges paid by investors upon redemption of shares, if for any reason the 
Plan is terminated, the Trustees will consider at that time the manner in 
which to treat such expenses. Any cumulative expenses incurred, but not yet 
recovered through distribution fees or contingent deferred sales charges, may 
or may not be recovered through future distribution fees or contingent 
deferred sales charges. 
    

   No interested person of the Fund nor any Trustee of the Fund who is not an 
interested person of the Fund, as defined in the Act, has any direct 
financial interest in the operation of the Plan except to the extent that the 
Distributor, InterCapital, DWR, DWSC 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. 

   The Plan may not be amended to increase materially the amount to be spent 
for the services described therein without approval by the shareholders of 
the affected Class or Classes of the Fund, and all material amendments to the 
Plan must also be approved by the Trustees in the manner described above. The 
Plan may be terminated at any time, without payment of any penalty, by vote 
of a majority of the Independent 12b-1 Trustees or by a vote of a majority of 
the outstanding voting securities of the Fund (as defined in the Act) on not 
more than thirty days' written notice to any other party to the Plan. So long 
as the Plan is in effect, the election and nomination of Independent 12b-1 
Trustees shall be committed to the discretion of the Independent 12b-1 
Trustees. 

DETERMINATION OF NET ASSET VALUE 
- ----------------------------------------------------------------------------- 

   
   As discussed in the Prospectus, the net asset value per share for each 
Class of shares of the Fund is determined once daily at 4:00 p.m., New York 
time (or, on days when the New York Stock Exchange closes prior to 4 p.m., at 
such earlier time), on each day that the New York Stock Exchange is open. The 
New York Stock Exchange currently observes the following holidays: New Year's 
Day, Reverend Dr. Martin Luther King, Jr. Day, Presidents' Day, Good Friday, 
Memorial Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas 
Day. 
    

   Portfolio securities (other than short-term debt securities and futures 
and options) are valued for the Fund by an outside independent pricing 
service approved by the Board of Trustees. The pricing service has informed 
the Fund that in valuing the Fund's portfolio securities it uses both a 
computerized grid matrix of tax-exempt securities and evaluations by its 
staff, in each case based on information concerning market transactions and 
quotations from dealers which reflect the bid side of the market each day. 
The Fund's portfolio securities are thus valued by reference to a combination 
of transactions and quotations for the same or other securities believed to 
be comparable in quality, coupon, maturity, type of issue, call provisions, 
trading characteristics and other features deemed to be relevant. The Board 
of Trustees believes that timely and reliable market quotations are generally 
not readily available to the Fund for purposes of valuing tax-exempt 
securities and that the valuations supplied by the pricing service, using the 
procedures outlined above and subject to periodic review, are more likely to 
approximate the fair value of such securities. The Investment Manager will 
periodically review and evaluate the procedures, methods and quality of 
services provided by the pricing service then being used by the Fund and may, 
from time to time, recommend to the Board of Trustees the use of other 
pricing services or discontinuance of the use of any pricing service in whole 
or part. The Board may determine to approve such recommendation or take other 
provisions for pricing of the Fund's portfolio securities. 

                               24           
<PAGE>
PURCHASE OF FUND SHARES 
- ----------------------------------------------------------------------------- 

   As discussed in the Prospectus, the Fund offers four Classes of shares as 
follows: 

INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES 

   Class A shares are sold to investors with an initial sales charge that 
declines to zero for larger purchases; however, Class A shares sold without 
an initial sales charge are subject to a contingent deferred sales charge 
("CDSC") of 1.0% if redeemed within one year of purchase, except in the 
circumstances discussed in the Prospectus. 

   Right of Accumulation. As discussed in the Prospectus, investors may 
combine the current value of shares purchased in separate transactions for 
purposes of benefitting from the reduced sales charges available for 
purchases of shares of the Fund totalling at least $25,000 in net asset 
value. For example, if any person or entity who qualifies for this privilege 
holds Class A shares of the Fund and/or other Dean Witter Funds that are 
multiple class funds ("Dean Witter Multi-Class Funds") or shares of other 
Dean Witter Funds sold with a front-end sales charge purchased at a price 
including a front-end sales charge having a current value of $5,000, and 
purchases $20,000 of additional shares of the Fund, the sales charge 
applicable to the $20,000 purchase would be 4.0% of the offering price. 

   
   The Distributor must be notified by the selected broker-dealer or the 
shareholder at the time a purchase order is placed that the purchase 
qualifies for the reduced charge under the Right of Accumulation. Similar 
notification must be made in writing by the selected broker-dealer or 
shareholder when such an order is placed by mail. The reduced sales charge 
will not be granted if: (a) such notification is not furnished at the time of 
the order; or (b) a review of the records of the Distributor or Morgan 
Stanley Dean Witter Trust FSB (the "Transfer Agent") fails to confirm the 
investor's represented holdings. 
    

   Letter of Intent. As discussed in the Prospectus, reduced sales charges 
are available to investors who enter into a written Letter of Intent 
providing for the purchase, within a thirteen-month period, of Class A shares 
of the Fund from the Distributor or from a single Selected Broker-Dealer. 

   A Letter of Intent permits an investor to establish a total investment 
goal to be achieved by any number of purchases over a thirteen-month period. 
Each purchase of Class A shares made during the period will receive the 
reduced sales commission applicable to the amount represented by the goal, as 
if it were a single purchase. A number of shares equal in value to 5% of the 
dollar amount of the Letter of Intent will be held in escrow by the Transfer 
Agent, in the name of the shareholder. The initial purchase under a Letter of 
Intent must be equal to at least 5% of the stated investment goal. 

   The Letter of Intent does not obligate the investor to purchase, nor the 
Fund to sell, the indicated amount. In the event the Letter of Intent goal is 
not achieved within the thirteen-month period, the investor is required to 
pay the difference between the sales charge otherwise applicable to the 
purchases made during this period and sales charges actually paid. Such 
payment may be made directly to the Distributor or, if not paid, the 
Distributor is authorized by the shareholder to liquidate a sufficient number 
of his or her escrowed shares to obtain such difference. 

   If the goal is exceeded and purchases pass the next sales charge level, 
the sales charge on the entire amount of the purchase that results in passing 
that level and on subsequent purchases will be subject to further reduced 
sales charges in the same manner as set forth above under "Right of 
Accumulation," but there will be no retroactive reduction of sales charges on 
previous purchases. For the purpose of determining whether the investor is 
entitled to a further reduced sales charge applicable to purchases at or 
above a sales charge level which exceeds the stated goal of a Letter of 
Intent, the cumulative current net asset value of any shares owned by the 
investor in any other Dean Witter Funds held by the shareholder which were 
previously purchased at a price including a front-end sales charge (including 
shares of the Fund and other Dean Witter Funds acquired in exchange for those 
shares, and including in each case shares acquired through reinvestment of 
dividends and distributions) will be added to the cost or net asset value of 
shares of the Fund owned by the investor. However, shares of "Exchange Funds" 
(see "Shareholder Services--Exchange Privilege") and the purchase of shares 
of other Dean Witter Funds will not be included in determining whether the 
stated goal of a Letter of Intent has been reached. 

                               25           
<PAGE>
   At any time while a Letter of Intent is in effect, a shareholder may, by 
written notice to the Distributor, increase the amount of the stated goal. In 
that event, only shares purchased during the previous 90-day period and still 
owned by the shareholder will be included in the new sales charge reduction. 
The 5% escrow and minimum purchase requirements will be applicable to the new 
stated goal. Investors electing to purchase shares of the Fund pursuant to a 
Letter of Intent should carefully read such Letter of Intent. 

CONTINGENT DEFERRED SALES CHARGE ALTERNATIVE--CLASS B SHARES 

   Class B shares are sold without an initial sales charge but are subject to 
a CDSC payable upon most redemptions within six years after purchase. As 
stated in the Prospectus, a CDSC will be imposed on any redemption by an 
investor if after such redemption the current value of the investor's Class B 
shares of the Fund is less than the dollar amount of all payments by the 
shareholder for the purchase of Class B shares during the preceding six 
years. 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. 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 Class B shares of the Fund until 
the time of redemption of such shares. For purposes of determining the number 
of years from the time of any payment for the purchase of shares, all 
payments made during a month will be aggregated and deemed to have been made 
on the last day of the month. Except as noted below, the following table sets 
forth the rates of the CDSC applicable to Class B shares of the Fund: 
    

<TABLE>
<CAPTION>
         YEAR SINCE 
          PURCHASE             CDSC AS A PERCENTAGE 
        PAYMENT MADE            OF AMOUNT REDEEMED 
- ---------------------------  ------------------------ 
<S>                          <C>            
First ......................            5.0% 
Second .....................            4.0% 
Third ......................            3.0% 
Fourth .....................            2.0% 
Fifth ......................            2.0% 
Sixth ......................            1.0% 
Seventh and thereafter  ....            None 
</TABLE>

   In 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 

                               26           
<PAGE>
such CDSC being imposed at the lowest possible rate. The CDSC will be 
imposed, in accordance with the table shown above, on any redemptions within 
six years of purchase which are in excess of these amounts and which 
redemptions do not qualify for waiver of the CDSC, as described in the 
Prospectus. 

   
   Class B shares of the Fund issued in exchange for shares of National 
Municipal in connection with the Reorganization that were subject to the 
lower CDSC schedule of National Municipal will continue to be subject to the 
lower CDSC schedule of National Municipal schedule unless (i) such shares are 
subsequently exchanged for shares of a fund with a higher CDSC schedule or 
(ii) having been exchanged for shares of Dean Witter Global Short-Term Income 
Fund Inc. ("Global Short-Term") or an Exchange Fund (as defined below in 
"Shareholder Services--Exchange Privilege") are re-exchanged back into the 
Fund. Under such circumstances, the CDSC schedule applicable to shares of the 
fund with the higher CDSC schedule acquired in the exchange will apply to 
redemptions of such fund's shares or, in the case of shares of Global 
Short-Term or any of the Exchange Funds acquired in an exchange and then 
subsequently re-exchanged back into the Fund, the CDSC schedule set forth in 
the above table will apply to redemptions of any of such shares. 
    

LEVEL LOAD ALTERNATIVE--CLASS C SHARES 

   Class C shares are sold without a sales charge but are subject to a CDSC 
of 1.0% on most redemptions made within one year after purchase, except in 
the circumstances discussed in the Prospectus. 

NO LOAD ALTERNATIVE--CLASS D SHARES 

   Class D shares are offered without any sales charge on purchase or 
redemption. Class D shares are offered only to those persons meeting the 
qualifications set forth in the Prospectus. 

SHAREHOLDER SERVICES 
- ----------------------------------------------------------------------------- 

   Upon the purchase of shares of the Fund, a Shareholder Investment Account 
is opened for the investor on the books of the Fund and maintained by the 
Transfer Agent. This is an open account in which shares owned by the investor 
are credited by the Transfer Agent in lieu of issuance of a share 
certificate. If a share certificate is desired, it must be requested in 
writing for each transaction. Certificates are issued only for full shares 
and may be redeposited in the account at any time. There is no charge to the 
investor for issuance of a certificate. Whenever a shareholder instituted 
transaction takes place in the Shareholder Investment Account, the 
shareholder will be mailed a confirmation of the transaction from the Fund or 
DWR or other selected broker-dealer. 

   
   Automatic Investment of Dividends and Distributions. As stated in the 
Prospectus, all income dividends and capital gains distributions are 
automatically paid in full and fractional shares of the applicable Class of 
the Fund, unless the shareholder requests that they be paid in cash. Each 
purchase of shares of the Fund is made upon the condition that the Transfer 
Agent is thereby automatically appointed as agent of the investor to receive 
all dividends and capital gains distributions on shares owned by the 
investor. Such dividends and distributions will be paid, at the net asset 
value per share, in shares of the applicable Class 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 should 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 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. It has been and remains the Fund's policy and 
practice that, if checks for dividends or distributions paid in cash remain 
uncashed, no interest will accrue on amounts represented by such uncashed 
checks. 
    

   Targeted Dividends. (Service Mark)  In states where it is legally 
permissible, shareholders may also have all income dividends and capital 
gains distributions automatically invested in shares of any Class of an 

                               27           
<PAGE>
open-end Dean Witter Fund other than Dean Witter Tax-Exempt Securities Trust 
or in another Class of Dean Witter Tax-Exempt Securities Trust. Such 
investment will be made as described above for automatic investment in shares 
of the applicable Class of the Fund, at the net asset value per share of the 
selected Dean Witter Fund as of the close of business on the payment date of 
the dividend or distribution and will begin to earn dividends, if any, in the 
selected Dean Witter Fund the next business day. To participate in the 
Targeted Dividends program, shareholders should contact their DWR or other 
selected broker-dealer account executive or the Transfer Agent. Shareholders 
of the Fund must be shareholders of the selected Class of the Dean Witter 
Fund targeted to receive investments from dividends at the time they enter 
the Targeted Dividends program. Investors should review the prospectus of the 
targeted Dean Witter Fund before entering the program. 

   
   EasyInvest. (Service Mark)  Shareholders may subscribe to EasyInvest, an 
automatic purchase plan which provides for any amount from $100 to $5,000 to 
be transferred automatically from a checking or savings account or following 
redemption of shares of a Dean Witter money market fund, on a semi-monthly, 
monthly or quarterly basis, to the Transfer Agent for investment in shares of 
the Fund. Shares purchased through EasyInvest will be added to the 
shareholder's existing account at the net asset value calculated the same 
business day the transfer of funds is effected (subject to any applicable 
sales charges). Shares of the Dean Witter money market funds redeemed in 
connection with EasyInvest are redeemed on the business day preceding the 
transfer of funds. For further information or to subscribe to EasyInvest, 
shareholders should contact their DWR or other selected broker-dealer account 
executive or the Transfer Agent. 
    

   Investment of Dividends or Distributions Received in Cash. Any shareholder 
who receives a cash payment representing a dividend or capital gains 
distribution may invest such dividend or distribution in shares of the 
applicable Class at net asset value, without the imposition of a CDSC upon 
redemption, by returning the check or the proceeds to the Transfer Agent 
within thirty days after the payment date. If the shareholder returns the 
proceeds of a dividend or distribution, such funds must be accompanied by a 
signed statement indicating that the proceeds constitute a dividend or 
distribution to be invested. Such investment will be made at the net asset 
value per share next determined after receipt of the 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 
their current net asset value. The plan provides for monthly or quarterly 
(March, June, September and December) checks in any dollar amount, not less 
than $25, or in any whole percentage of the account balance, on an annualized 
basis. Any applicable CDSC will be imposed on shares redeemed under the 
Withdrawal Plan (see "Purchase of Fund Shares"). Therefore, any shareholder 
participating in the Withdrawal Plan will have sufficient shares redeemed 
from his or her account so that the proceeds (net of any applicable CDSC) to 
the shareholder will be the designated monthly or quarterly amount. 

   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 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 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 concurrently with purchases of additional 
shares may be inadvisable because of sales charges which may be applicable to 
purchases or redemptions of shares (see "Purchase of Fund Shares"). 

                               28           
<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 and the address to which checks are mailed 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, 
shareholders may make additional investments in any Class of shares of the 
Fund for which they qualify at any time by sending a check in any amount, not 
less than $100, payable to Dean Witter Tax-Exempt Securities Trust, and 
indicating the selected Class, directly to the Fund's Transfer Agent. In the 
case of Class A shares, after deduction of any applicable sales charge, the 
balance will be applied to the purchase of Fund shares, and, in the case of 
shares of the other Classes, the entire amount will be applied to the 
purchase of Fund shares, at the net asset value per share next computed after 
receipt of the check or purchase payment by the Transfer Agent. The shares so 
purchased will be credited to the investor's account. 

EXCHANGE PRIVILEGE 

   
   As discussed in the Prospectus, the Fund makes available to its 
shareholders an Exchange Privilege whereby shareholders of each Class of 
shares of the Fund may exchange their shares for shares of the same Class of 
shares of any other Dean Witter Multi-Class Fund without the imposition of 
any exchange fee. Shares may also be exchanged for shares of any of the 
following funds: Dean Witter Short-Term U.S. Treasury Trust, Dean Witter 
Limited Term Municipal Trust, Dean Witter Short-Term BondFund, Dean Witter 
Intermediate Term U.S. Treasury Trust and five Dean Witter Funds which are 
money market funds (the foregoing nine funds are hereinafter referred to as 
the "Exchange Funds"). Class A shares may also be exchanged for shares of 
Dean Witter Multi-State Municipal Series Trust and Dean Witter Hawaii 
Municipal Trust, which are Dean Witter Funds sold with a front-end sales 
charge ("FSC Funds"). Class B shares may also be exchanged for shares of Dean 
Witter Global Short-Term Income Fund Inc. ("Global Short-Term") which is a 
Dean Witter Fund offered with a CDSC. Exchanges may be made after the shares 
of the Fund acquired by purchase (not by exchange or dividend reinvestment) 
have been held for thirty days. There is no waiting period for exchanges of 
shares acquired by exchange or dividend reinvestment. An exchange will be 
treated for federal income tax purposes the same as a repurchase or 
redemption of shares, on which the shareholder may realize a capital gain or 
loss. 
    

   Any new account established through the Exchange Privilege will have the 
same registration and cash dividend or dividend reinvestment plan as the 
present account, unless the Transfer Agent receives written notification to 
the contrary. For telephone exchanges, the exact registration of the existing 
account and the account number must be provided. 

   Any shares held in certificate form cannot be exchanged but must be 
forwarded to the Transfer Agent and deposited into the shareholder's account 
before being eligible for exchange. (Certificates mailed in for deposit 
should not be endorsed.) 

   
   As described below, and in the Prospectus under the caption "Purchase of 
Fund Shares," a CDSC may be imposed upon a redemption, depending on a number 
of factors, including the number of years from the time of purchase until the 
time of redemption or exchange ("holding period"). When shares of a Dean 
Witter Multi-Class Fund or Global Short-Term are exchanged for shares of an 
Exchange Fund, the exchange is executed at no charge to the shareholder, 
without the imposition of the CDSC at the time of the exchange. During the 
period of time the shareholder remains in the Exchange Fund (calculated 
    

                               29           
<PAGE>
   
from the last day of the month in which the Exchange Fund shares were 
acquired), the holding period or "year since purchase payment made" is 
frozen. When shares are redeemed out of the Exchange Fund, they will be 
subject to a CDSC which would be based upon the period of time the 
shareholder held shares in a Dean Witter Multi-Class Fund or in Global 
Short-Term. However, in the case of shares exchanged into an Exchange Fund on 
or after April 23, 1990, upon a redemption of shares which results in a CDSC 
being imposed, a credit (not to exceed the amount of the CDSC) will be given 
in an amount equal to the Exchange Fund 12b-1 distribution fees incurred on 
or after that date which are attributable to those shares. Shareholders 
acquiring shares of an Exchange Fund pursuant to this exchange privilege may 
exchange those shares back into a Dean Witter Multi-Class Fund or Global 
Short-Term from the Exchange Fund, with no CDSC being imposed on such 
exchange. The holding period previously frozen when shares were first 
exchanged for shares of the Exchange Fund resumes on the last day of the 
month in which shares of a Dean Witter Multi-Class Fund or of Global 
Short-Term are reacquired. A CDSC is imposed only upon an ultimate 
redemption, based upon the time (calculated as described above) the 
shareholder was invested in a Dean Witter Multi-Class Fund or in Global 
Short-Term. In the case of exchanges of Class A shares which are subject to a 
CDSC, the holding period also includes the time (calculated as described 
above) the shareholder was invested in a FSC Fund. 

   When shares initially purchased in a Dean Witter Multi-Class Fund or in 
Global Short-Term are exchanged for shares of a Dean Witter Multi-Class Fund, 
shares of Global Short-Term, shares of a FSC Fund, or shares of an Exchange 
Fund, the date of purchase of the shares of the fund exchanged into, for 
purposes of the CDSC upon redemption, will be the last day of the month in 
which the shares being exchanged were originally purchased. In allocating the 
purchase payments between funds for purposes of the CDSC, the amount which 
represents the current net asset value of shares at the time of the exchange 
which were (i) purchased more than one, three or six years (depending on the 
CDSC schedule applicable to the shares) prior to the exchange, (ii) 
originally acquired through reinvestment of dividends or distributions and 
(iii) acquired in exchange for shares of FSC Funds, or for shares of other 
Dean Witter Funds for which shares of FSC Funds have been exchanged (all such 
shares called "Free Shares"), will be exchanged first. After an exchange, all 
dividends earned on shares in an Exchange Fund will be considered Free 
Shares. If the exchanged amount exceeds the value of such Free Shares, an 
exchange is made, on a block-by-block basis, of non-Free Shares held for the 
longest period of time (except that, with respect to Class B shares, if 
shares held for identical periods of time but subject to different CDSC 
schedules are held in the same Exchange Privilege account, the shares of that 
block that are subject to a lower CDSC rate will be exchanged prior to the 
shares of that block that are subject to a higher CDSC rate). Shares equal to 
any appreciation in the value of non-Free Shares exchanged will be treated as 
Free Shares, and the amount of the purchase payments for the non-Free Shares 
of the fund exchanged into will be equal to the lesser of (a) the purchase 
payments for, or (b) the current net asset value of, the exchanged non-Free 
Shares. If an exchange between funds would result in exchange of only part of 
a particular block of non-Free Shares, then shares equal to any appreciation 
in the value of the block (up to the amount of the exchange) will be treated 
as Free Shares and exchanged first, and the purchase payment for that block 
will be allocated on a pro rata basis between the non-Free Shares of that 
block to be retained and the non-Free Shares to be exchanged. The prorated 
amount of such purchase payment attributable to the retained non-Free Shares 
will remain as the purchase payment for such shares, and the amount of 
purchase payment for the exchanged non-Free Shares will be equal to the 
lesser of (a) the prorated amount of the purchase payment for, or (b) the 
current net asset value of, those exchanged non-Free Shares. Based upon the 
procedures described in the Prospectus under the caption "Purchase of Fund 
Shares," any applicable CDSC will be imposed upon the ultimate redemption of 
shares of any fund, regardless of the number of exchanges since those shares 
were originally purchased. Class B shares of the Fund issued in exchange for 
shares of National Municipal in connection with the Reorganization that were 
subject to the lower CDSC schedule of National Municipal will continue to be 
subject to that lower CDSC schedule unless (i) such shares are subsequently 
exchanged for shares of a fund with a higher CDSC schedule or (ii) having 
been exchanged for shares of Global Short-Term or an Exchange Fund are 
re-exchanged back into the Fund. Under such circumstances, the CDSC schedule 
applicable to shares of the fund with the higher CDSC schedule acquired in 
the exchange will apply to redemptions of such fund's shares or, in the case 
of shares of Global Short-Term or any of the Exchange Funds acquired in an 
exchange and then subsequently re-exchanged back into the Fund, the Fund's 
CDSC schedule will apply to redemptions of any of such shares. 
    

                               30           
<PAGE>
   With respect to the redemption or repurchase of shares of the Fund, the 
application of proceeds to the purchase of new shares in the Fund or any 
other of the funds and the general administration of the Exchange Privilege, 
the Transfer Agent acts as agent for the Distributor and for the 
shareholder's selected broker-dealer, if any, in the performance of such 
functions. With respect to exchanges, redemptions or repurchases, the 
Transfer Agent shall be liable for its own negligence and not for the default 
or negligence of its correspondents or for losses in transit. The Fund shall 
not be liable for any default or negligence of the Transfer Agent, the 
Distributor or any selected broker-dealer. 

   The Distributor and any selected broker-dealer have authorized and 
appointed the Transfer Agent to act as their agent in connection with the 
application of proceeds of any redemption of Fund shares to the purchase of 
shares of any other fund and the general administration of the Exchange 
Privilege. No commission or discounts will be paid to the Distributor or any 
selected broker-dealer for any transactions pursuant to this Exchange 
Privilege. 

   Exchanges are subject to the minimum investment requirement and any other 
conditions imposed by each fund. (The minimum initial investment for the 
Exchange Privilege account of each Class is $5,000 for Dean Witter Liquid 
Asset Fund Inc., Dean Witter Tax-Free Daily Income Trust, Dean Witter New 
York Municipal Money Market Trust and Dean Witter California Tax-Free Daily 
Income Trust, although those funds may, at their discretion, accept initial 
investments of as low as $1,000. The minimum initial investment for the 
Exchange Privilege account of each Class is $10,000 for Dean Witter 
Short-Term U.S. Treasury Trust, although that fund may, at its discretion, 
accept initial investments of as low as $5,000. The minimum initial 
investment for the Exchange Privilege account of each Class is $5,000 for 
Dean Witter Special Value Fund. The minimum initial investment for the 
Exchange Privilege account of each Class of all other Dean Witter Funds for 
which the Exchange Privilege is available is $1,000.) Upon exchange into an 
Exchange Fund, the shares of that fund will be held in a special Exchange 
Privilege Account separately from accounts of those shareholders who haved 
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 Exchange Funds, 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(s), policies and restrictions. 

   For further information regarding the Exchange Privilege, shareholders 
should contact their DWR or other selected broker-dealer account executive or 
the Transfer Agent. 

REDEMPTIONS AND REPURCHASES 
- ----------------------------------------------------------------------------- 

   Redemption. As stated in the Prospectus, shares of each Class of the Fund 
can be redeemed for cash at any time at the net asset value per share next 
determined; however, such redemption proceeds will be reduced by the amount 
of any applicable CDSC. If shares are held in a shareholder's account without 
a share certificate, a written request for redemption to the Fund's Transfer 
Agent at P.O. Box 983, Jersey City, NJ 07303 is required. If certificates are 
held by the shareholder, the shares may be redeemed by surrendering the 
certificates with a written request for redemption. The share certificate, or 

                               31           
<PAGE>
   
an accompanying stock power, and the request for redemption, must be signed 
by the shareholder or shareholders exactly as the shares are registered. Each 
request for redemption, whether or not accompanied by a share certificate, 
must be sent to the Fund's Transfer Agent, which will redeem the shares at 
their net asset value next computed (see "Purchase of Fund Shares" in the 
Prospectus) after it receives the request, and certificate, if any, in good 
order. Any redemption request received after such computation will be 
redeemed at the next determined net asset value. The term "good order" means 
that the share certificate, if any, and request for redemption are properly 
signed, accompanied by any documentation required by the Transfer Agent, and 
bear signature guarantees when required by the Fund or the Transfer Agent. If 
redemption is requested by a corporation, partnership, trust or fiduciary, 
the Transfer Agent may require that written evidence of authority acceptable 
to the Transfer Agent be submitted before such request is accepted. 
    

   Whether certificates are held by the shareholder or shares are held in a 
shareholder's account, if the proceeds are to be paid to any person other 
than the record owner, or if the proceeds are to be paid to a corporation 
(other than the Distributor or a selected broker-dealer for the account of 
the shareholder), partnership, trust or fiduciary, or sent to the shareholder 
at an address other than the registered address, signatures must be 
guaranteed by an eligible guarantor acceptable to the Transfer Agent 
(shareholders should contact the Transfer Agent for a determination as to 
whether a particular institution is such an eligible guarantor). A stock 
power may be obtained from any dealer or commercial bank. The Fund may change 
the signature guarantee requirements from time to time upon notice to 
shareholders, which may be by means of a new prospectus. 

   Repurchase. As stated in the Prospectus, DWR and other selected 
broker-dealers are authorized to repurchase shares represented by a share 
certificate which is delivered to any of their offices. Shares held in a 
shareholder's account without a share certificate may also be repurchased by 
DWR and other selected broker-dealers upon the telephonic request of the 
shareholder. The repurchase price is the net asset value next computed after 
such purchase order is received by DWR or other selected broker-dealer 
reduced by any applicable CDSC. 

   
   Payment for Shares Redeemed or Repurchased. As discussed in the 
Prospectus, payment for shares of any Class presented for repurchase or 
redemption will be made by check within seven days after receipt by the 
Transfer Agent of the certificate and/or written request in good order. Such 
payment may be postponed or the right of redemption suspended at times (a) 
when the New York Stock Exchange is closed for other than customary weekends 
and holidays, (b) when trading on that Exchange is restricted, (c) when an 
emergency exists as a result of which disposal by the Fund of securities 
owned by it is not reasonably practicable or it is not reasonably practicable 
for the Fund fairly to determine the value of its net assets, or (d) during 
any other period when the Securities and Exchange Commission by order so 
permits; provided that applicable rules and regulations of the Securities and 
Exchange Commission shall govern as to whether the conditions prescribed in 
(b) or (c) exist. If the shares to be redeemed have recently been purchased 
by check (including a certified or bank cashier's check), payment of 
redemption proceeds may be delayed for the minimum time needed to verify that 
the check used for investment hasbeen honored (not more than fifteen days 
from the time of receipt of the check by the Transfer Agent). It has been and 
remains the Fund's policy and practice that, if checks for redemption 
proceeds remain uncashed, no interest will accrue on amounts represented by 
such uncashed checks. Shareholders maintaining margin accounts with DWR or 
another selected broker-dealer are referred to their account executive 
regarding restrictions on redemption of shares of the Fund pledged in the 
margin account. 
    

   Transfers of Shares. In the event a shareholder requests a transfer of any 
shares to a new registration, such shares will be transferred without sales 
charge at the time of transfer. With regard to the status of shares which are 
either subject to the CDSC or free of such charge (and with regard to the 
length of time shares subject to the charge have been held), any transfer 
involving less than all the shares in an account will be made on a pro rata 
basis (that is, by transferring shares in the same proportion that the 
transferred shares bear to the total shares in the account immediately prior 
to the transfer). The transferred shares will continue to be subject to any 
applicable CDSC as if they had not been so transferred. 

                               32           
<PAGE>
   Reinstatement Privilege. As described in the Prospectus, a shareholder who 
has had his or her shares redeemed or repurchased and has not previously 
exercised this reinstatement privilege may, within 35 days after the date of 
the redemption or repurchase, reinstate any portion or all of the proceeds of 
such redemption or repurchase in shares of the Fund in the same Class at the 
net asset value next determined after a reinstatement request, together with 
such 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 
- ----------------------------------------------------------------------------- 

   Each shareholder will receive at least a quarterly summary of his or her 
account, including information as to reinvested dividends and capital gains 
distributions. Share certificates for dividends or distributions will not be 
issued unless a shareholder requests in writing that a certificate be issued 
for a specific number of shares. 

   In computing net investment income, the Fund will amortize any premiums 
and original issue discounts on securities owned, if applicable. Capital 
gains or losses realized upon sale or maturity of such securities will be 
based on their amortized cost. 

   
   Gains or losses on the 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. The Taxpayer Relief Act of 1997 reduced the maximum tax 
on long-term capital gains from 28% to 20%; however, it also lengthened the 
required holding period to obtain this lower rate from more than 12 months to 
more than 18 months. These lower rates do not apply to collectibles and 
certain other assets. Additionally, the maximum capital gain rate for assets 
that are held more than five years and that are acquired after December 31, 
2000 is 18%. Gains or losses on the sale of securities held for twelve months 
or less will be short-term capital gains or losses. 

   The Fund has qualified and intends to remain qualified as a regulated 
investment company under Subchapter M of the Internal Revenue Code. If so 
qualified, the Fund will not be subject to federal income tax on its net 
investment income and capital gains, if any, realized during any fiscal year 
to the extent that it distributes such income and capital gains to its 
shareholders. 

   With respect to the Fund's investments in zero coupon bonds, the Fund 
accrues income prior to any actual cash payments by their issuers. In order 
to continue to comply with Subchapter M of the Internal Revenue Code and 
remain able to forego payment of federal income tax on its income and capital 
gains, the Fund must distribute all of its net investment income, including 
income accrued from zero coupon bonds. As such, the Fund may be required to 
dispose of some of its portfolio securities under disadvantageous 
circumstances to generate the cash required for distribution. 
    

   As discussed in the Prospectus, the Fund intends to qualify to pay 
"exempt-interest dividends" to its shareholders by maintaining, as of the 
close of each of its taxable years, at least 50% of the value of its assets 
in tax-exempt securities. An exempt-interest dividend is that part of the 
dividend distributions made by the Fund which consists of interest received 
by the Fund on tax-exempt securities upon which the shareholder incurs no 
federal income taxes. Exempt-interest dividends are included however, in 
determining what portion, if any, of a person's Social Security benefits are 
subject to federal income tax. 

   As also discussed in the Prospectus, the Fund intends to invest a portion 
of its assets in certain "private activity bonds" issued after August 7, 
1986. As a result, a portion of the exempt-interest dividends paid by the 
Fund will be an item of tax preference to shareholders subject to the 
alternative minimum tax. Certain corporations which are subject to the 
alternative minimum tax may also have to include exempt-interest dividends in 
calculating their alternative minimum taxable income in situations where the 
"adjusted current earnings" of the corporation exceeds its alternative 
minimum taxable income. 

                               33           
<PAGE>
   
   Within sixty days after the end of its fiscal year, the Fund will mail to 
shareholders a statement indicating the percentage of the dividend 
distributions for each fiscal year which constitutes exempt-interest 
dividends, the percentage, if any, that is taxable, and the percentage, if 
any, of the exempt-interest dividends which constitutes an item of tax 
preference, and to what extent the taxable portion is long-term capital gain, 
short-term capital gain or ordinary income. This percentage should be applied 
uniformly to all monthly distributions made during the fiscal year to 
determine the proportion of dividends that is tax-exempt. The percentage may 
differ from the percentage of tax-exempt dividend distributions for any 
particular month. Shareholders will also be notified of their proportionate 
share of long-term capital gains distributions that are eligible for a 
reduced rate of tax under the Taxpayer Relief Act of 1997. 
    

   Shareholders will be subject to federal income tax on dividends paid from 
interest income derived from taxable securities and on distributions of net 
short-term capital gains. Such dividends and distributions 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 
long-term capital gains, if any, are taxable as long-term capital gains, 
regardless of how long the shareholder has held the Fund shares and 
regardless of whether the distribution is received in additional shares or in 
cash. Since the Fund's income is expected to be derived entirely from 
interest rather than dividends, it is anticipated that no portion of such 
dividend distributions will be eligible for the federal dividends received 
deduction available to corporations. 

   Interest on indebtedness incurred by shareholders to purchase or carry 
shares of the Fund is not deductible. Furthermore, entities or persons who 
are "substantial users" (or related persons) of facilities financed by 
industrial development bonds should consult their tax advisers before 
purchasing shares of the Fund. "Substantial user" is defined generally by 
Income Tax Regulation 1.103-11(b) as including a "non-exempt person" who 
regularly uses in a trade or business a part of a facility financed from the 
proceeds of industrial development bonds. 

   From time to time, proposals have been introduced before Congress for the 
purpose of restricting or eliminating the federal income tax exemption for 
interest on municipal securities. Similar proposals may be introduced in the 
future. If such a proposal were enacted, the availability of municipal 
securities for investment by the Fund could be affected. In that event, the 
Fund would re-evaluate its investment objective and policies. 

   Any dividends or capital gains distributions received by a shareholder 
from any investment company will have the effect of reducing the net asset 
value of the shareholder's shares in that fund by the exact amount of the 
dividend or capital gains distribution. Furthermore, capital gains 
distributions are, and some portion of the dividends may be, subject to 
income tax. If the net asset value of the shares should be reduced below a 
shareholder's cost as a result of the payment of taxable dividends or the 
distribution of capital gains, such payment or distribution would be in part 
a return of capital but nonetheless taxable to the shareholder. Therefore, an 
investor should consider the tax implications of purchasing Fund shares 
immediately prior to a distribution record date. 

   Shareholders should consult their tax advisers regarding specific 
questions as to state or local taxes. 

PERFORMANCE INFORMATION 
- ----------------------------------------------------------------------------- 

   
   As discussed in the Prospectus, from time to time the Fund may quote its 
"yield" and/or its "total return" in advertisements and sales literature. 
These figures are computed separately for Class A, Class B, Class C and Class 
D shares. 

   Prior to July 28, 1997, the Fund offered only one Class of shares subject 
to a maximum sales charge of 4.0% and no 12b-1 fee. Because the distribution 
arrangement for Class A most closely resembles the distribution arrangement 
applicable prior to the implementation of multiple classes (i.e., Class A is 
sold with a front-end sales charge), historical performance information has 
been restated to reflect (i) the actual maximum sales charges applicable to 
Class A (i.e., 4.25%) and (ii) the ongoing 12b-1 fee applicable to Class A 
Shares. Furthermore, because all shares of the Fund held prior to July 28, 
1997 have been designated Class D shares, the Fund's historical performance 
has also been restated to 

                               34           
    
<PAGE>
   
reflect the absence of any sales charge in the class of Class D shares. 
Following the restated performance information for Class A and Class D is the 
actual performance of the Fund based on its original, single class sales 
charge structure as of its last fiscal year. Also set forth below is the 
actual performance of Class B and Class C as of their last fiscal year. 

   Yield is calculated for any 30-day period as follows: the amount of 
interest and/or dividend income for each security in the Fund's portfolio is 
determined in accordance with regulatory requirements; the total for the 
entire portfolio constitutes the Fund's gross income for the period. Expenses 
accrued during the period are subtracted to arrive at "net investment income" 
of each Class. The resulting amount is divided by the product of the maximum 
offering price per share on the last day of the period multiplied by the 
average number of shares of the applicable Class outstanding during the 
period that were entitled to dividends. This amount is added to 1 and raised 
to the sixth power. 1 is then subtracted from the result and the difference 
is multiplied by 2 to arrive at the annualized yield. For the 30-day period 
ended December 31, 1997, the Fund's yield for the Class A, Class B, Class C 
and Class D shares, calculated pursuant to this formula was 4.18%, 4.01%, 
3.90% and 4.62%, respectively. 

   The Fund may also quote a "tax-equivalent yield" for each Class determined 
by dividing the tax-exempt portion of quoted yield by 1 minus the stated 
income tax rate and adding the result to the portion of the yield that is not 
tax-exempt. The yield for Class A, Class B, Class C and Class D shares, based 
upon a Federal personal income tax bracket of 39.60% (the highest current 
individual marginal tax rate), for the 30-day period ended December 31, 1997 
were 6.92%, 6.64%, 6.46% and 7.65%, respectively, based upon the yield quoted 
above. 

   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 for Class A reflects the imposition of the maximum front-end 
sales charge for Class A. The ending redeemable value for Class B and Class C 
is reduced by any CDSC at the end of the one, five or ten year or other 
period. For the purpose of this calculation, it is assumed that all dividends 
and distributions are reinvested. The formula for computing the average 
annual total return involves a percentage obtained by dividing the ending 
redeemable value by the amount of the initial investment, taking a root of 
the quotient (where root is equivalent to the number of years in the period) 
and subtracting 1 from the result. The restated average annual total returns 
of the Class A and Class D shares of the Fund for the year ended December 31, 
1997 were 3.86% and 8.73%, respectively; for the five years ended December 
31, 1997 were 5.61% and 6.79%, respectively; and for the ten years ended 
December, 1997 were 7.76% and 8.50%, respectively. 

   In addition to the foregoing, the Fund may advertise its total return for 
each Class over different periods of time by means of aggregate, average, 
year-by-year or other types of total return figures. Such calculation may or 
may not reflect the imposition of the maximum front end sales charge for 
Class A or the deduction of the CDSC for each of Class B and Class C which, 
if reflected, would reduce the performance quoted. For example, the average 
annual total return of the Fund may be calculated in the manner described in 
the preceding paragraph, but without the deduction for any applicable sales 
charge. Based on the foregoing calculation, the Fund's restated average 
annual total return for Class A shares for the year ended December 31, 1997 
was 8.47%, the average annual total return for the five years ended December 
31, 1997 was 6.53% and the average annual total return for the ten years 
ended December 31, 1997 was 8.23%. Because the Class D shares are not subject 
to any sales charge, the Fund would only advertise average annual total 
returns as calculated in the previous paragraph. 

   For periods of less than one year, the Fund quotes its total return on a 
non-annualized basis. Accordingly, the Fund may compute its aggregate total 
return for each of Class B and Class C for specified periods by determining 
the aggregate percentage rate which will result in the ending value of a 
hypothetical $1,000 investment made at the beginning of the period. For the 
purpose of this calculation, it is assumed that all dividends and 
distributions are reinvested. The formula for computing aggregate total 
return involves a percentage obtained by dividing the ending value by the 
initial $1,000 investment 

                               35           
    
<PAGE>
   
and subtracting 1 from the result. The ending redeemable value for Class B 
and Class C is reduced by any CDSC at the end of the period. Based on the 
foregoing calculations, the total returns for the period July 28, 1997 
through December 31, 1997 were -1.43% and 2.28% for Class B and Class C, 
respectively. 

   In addition, the Fund may compute its aggregate total return for each 
Class for specified periods by determining the aggregate percentage rate 
which will result in the ending value of a hypothetical $1,000 investment 
made at the beginning of the period. For the purpose of this calculation, it 
is assumed that all dividends and distributions are reinvested. The formula 
for computing aggregate total return involves a percentage obtained by 
dividing the ending value (without reduction for any applicable sales charge) 
by the initial $1,000 investment and subtracting 1 from the result. Based on 
the foregoing calculation, the Fund's restated total return for both Class A 
and Class D shares for the year ended December 31, 1997 was 8.47% and 8.73%, 
respectively; the restated total return for the five years ended December 31, 
1997 was 37.20% and 38.91%, respectively; and the restated total return for 
the ten years ended December 31, 1997 was 120.48% and 126.0%, respectively. 
Based on the foregoing calculation, the total returns for Class B and Class C 
for the period July 28, 1997 through December 31, 1997 were 3.57% and 3.28%, 
respectively. 

   The Fund may advertise the growth of hypothetical investments of $10,000, 
$50,000 and $100,000 in each Class of shares of the Fund by adding 1 to the 
Fund's aggregate total return to date (expressed as a decimal and without 
taking into account the effect of any applicable CDSC) and multiplying by 
$9,575, $48,250 and $97,250 in the case of Class A (investments of $10,000, 
$50,000 and $100,000 adjusted for the initial sales charge) or by $10,000, 
$50,000 and $100,000 in the case of each of Class B, Class C and Class D, as 
the case may be. Investments of $10,000, $50,000 and $100,000 in each Class 
at inception of the Class would have grown to the following amounts at 
December 31, 1997: 
    

   
<TABLE> 
<CAPTION>  
                           INVESTMENT AT INCEPTION OF: 
            INCEPTION   -------------------------------  
CLASS         DATE:      $10,000    $50,000    $100,000 
- ---------  -----------  ---------  ---------   --------
<S>        <C>         <C>         <C>         <C>
Class A...   3/27/80     $46,839   $236,029    $475,728 
Class B...   7/28/97      10,357     51,785     103,570 
Class C...   7/28/97      10,328     51,640     103,280 
Class D...   3/27/80      51,118    255,590     511,180 
</TABLE>
    

   
   For purposes of restating the performance of Class A, the inception date 
set forth in the above table is the inception date of the Fund. However, 
Class A did not actually commence operation until July 28, 1997. 

   The actual average annual total returns of the Fund, calculated pursuant 
to the formula described above, for the year ended December 31, 1997, for the 
five years ended December 31, 1997, and for the ten years ended December 31, 
1997, were 4.38%, 5.93% and 8.05%, respectively. The actual average annual 
total returns of the Fund calculated without the deduction for any applicable 
sales charge for the year ended December 31, 1997, for the five years ended 
December 31, 1997, and for the ten years ended December 31, 1997, were 8.73%, 
6.79% and 8.50%, respectively. The Fund's actual aggregate total return, 
calculated pursuant to the formula described above, for the year ended 
December 31, 1997 was 8.73%, the actual total return for the five years ended 
December 31, 1997 was 38.91% and the actual total return for the ten years 
ended December 31, 1997 was 126.00%. Investments of $10,000, $50,000 and 
$100,000, adjusted for the sales charges in effect at such time (4.0%, 3.25% 
or 2.75%, respectively), in the Fund at inception would have grown to 
$49,074, $247,283 and $497,123, respectively, at December 31, 1997. All 
shares of the Fund held prior to July 28, 1997 were designated Class D shares 
and accordingly, the actual performance numbers set forth above represent the 
actual performance of the continuing Class D. 

   The Fund from time to time may also advertise its performance relative to 
certain performance rankings and indexes complied by independent 
organizations. 
    

                               36           
<PAGE>
DESCRIPTION OF SHARES OF THE FUND 
- ----------------------------------------------------------------------------- 

   
   The Shareholders of the Fund are entitled to a full vote for each full 
share held. All of the Trustees have been elected by the shareholders of the 
Fund, most recently at a Special Meeting of Shareholders held on May 21, 
1997. The 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 or shorten 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 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 
presently authorized any such additional series or classes of shares other 
than as set forth in the Prospectus. 

   The Declaration of Trust further provides that no Trustee, officer, 
employee or agent of the Fund is liable to the Fund or to a shareholder, nor 
is any Trustee, officer, employee or agent liable to any third persons in 
connection with the affairs of the Fund, except as such liability may arise 
from his/her or its own bad faith, willful misfeasance, gross negligence, or 
reckless disregard of his duties. It also provides that all third persons 
shall look solely to the Fund property for satisfaction of claims arising in 
connection with the affairs of the Fund. With the exceptions stated above, 
the Declaration of Trust provides that a Trustee, officer, employee or agent 
is entitled to be indemnified against all liability in connection with the 
affairs of the Fund. 

   The Fund is authorized to issue an unlimited number of shares of 
beneficial interest. The Fund shall be of unlimited duration subject to the 
provisions in the Declaration of Trust concerning termination by action of 
the shareholders or the Trustees. 

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. The Custodian has no part in deciding the 
Fund's investment policies or which securities are to be purchased or sold 
for the Fund's portfolio. Any of the Fund's cash balances with the Custodian 
in excess of $100,000 are unprotected by Federal deposit insurance. Such 
balances may, at times, be substantial. 

   
   Morgan Stanley Dean Witter Trust FSB ("MSDW Trust"), Harborside Financial 
Center, Plaza Two, Jersey City, New Jersey 07311 is the Transfer Agent of the 
Fund's shares and Dividend Disbursing Agent for payment of dividends and 
distributions on Fund shares and Agent for shareholders under various 
investment plans described herein. MSDW Trust is an affiliate of Dean Witter 
InterCapital Inc., the Fund's Investment Manager, and Dean Witter 
Distributors Inc., the Fund's Distributor. As Transfer Agent and Dividend 
Disbursing Agent, MSDW Trust's responsibilities include maintaining 
shareholder accounts, disbursing cash dividends and reinvesting dividends, 
processing account registration changes, handling purchase and redemption 
transactions, mailing prospectuses and reports, mailing and tabulating 
proxies, processing share certificate transactions, and maintaining 
shareholder records and lists. For these services MSDW Trust receives a per 
shareholder account fee from the Fund. 
    

                               37           
<PAGE>
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 is the calendar year. 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 the General Counsel of the 
Investment Manager, is an officer and the General Counsel of the Fund. 

EXPERTS 
- ----------------------------------------------------------------------------- 

   
   The annual financial statements of the Fund for the year ended December 
31, 1997, which are included in this Statement of Additional Information and 
incorporated by reference in the Prospectus, have been so included and 
incorporated in reliance on the report of Price Waterhouse LLP, independent 
accountants, given on the authority of said firm as experts in auditing and 
accounting. 
    

REGISTRATION STATEMENT 
- ----------------------------------------------------------------------------- 

   This Statement of Additional Information and the Prospectus do not contain 
all of the information set forth in the Registration Statement the Fund has 
filed with the Securities and Exchange Commission. The complete Registration 
Statement may be obtained from the Securities and Exchange Commission upon 
payment of the fee prescribed by the rules and regulations of the Commission. 

                               38           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
PORTFOLIO OF INVESTMENTS December 31, 1997 

   
<TABLE>
<CAPTION>
  PRINCIPAL 
  AMOUNT IN                                                                    COUPON    MATURITY 
  THOUSANDS                                                                     RATE       DATE         VALUE 
- ----------------------------------------------------------------------------------------------------------------- 
<S>          <C>                                                                <C>      <C>        <C>
             TAX-EXEMPT MUNICIPAL BONDS (97.5%) 
             General Obligation (13.4%) 
             North Slope Borough, Alaska, 
$ 5,000       Ser 1992 A Conv (MBIA) .........................................  5.90 %   06/30/03   $ 5,403,400 
 18,000       Ser 1994 B (FSA)  ..............................................  0.00     06/30/05    12,741,660 
 18,500       Ser 1995 A (MBIA) ..............................................  0.00     06/30/06    12,506,000 
 10,000       Ser 1996 B (MBIA) ..............................................  0.00     06/30/07     6,396,100 
 13,925       Ser 1996 B (MBIA) ..............................................  0.00     06/30/06     9,374,310 
  1,000      Santa Margarita/Dana Point Authority, California,                                      
              Impr Dists #3, 3A, 4 & 4A 1994 Ser B Refg (MBIA) ...............  5.75     08/01/20     1,047,510 
  4,000      Connecticut, College Savings 1989 Ser A .........................  0.00     07/01/08     2,458,440 
  1,000      Atlanta, Georgia, Public Impr Ser 1994 A ........................  6.125    12/01/23     1,090,940 
  2,000      Chicago, Illinois, Refg Ser 1995 B (FGIC) .......................  5.125    01/01/25     1,966,960 
  1,000      Chicago Park District, Illinois, Ser 1995  ......................  6.60     11/15/14     1,122,030 
  1,000      Chelsea, Massachusetts, School Act of 1948 (AMBAC) ..............  6.50     06/15/12     1,105,760 
             Massachusetts,                                                                         
 20,000       Refg 1996 Ser A (AMBAC) ........................................  6.00     11/01/10    22,689,800 
  8,000       Refg 1993 Ser A ................................................  5.50     02/01/11     8,259,840 
  4,000      Clark County, Nevada, Transportation Ser 1992 A (AMBAC) .........  6.50     06/01/17     4,745,920 
             New York City, New York,                                                               
  1,500       1995 Ser D (MBIA) ..............................................  6.20     02/01/07     1,679,910 
 10,000       1990 Ser D .....................................................  6.00     08/01/08    10,204,800 
 15,000      North Carolina, 1997 Ser A  .....................................  5.20     03/01/16    15,486,750 
  1,000      Delaware City School District, Ohio, Constr & Impr (FGIC)  ......  5.75     12/01/20     1,049,710 
 10,000      Pennsylvania, First Ser 1995 (FGIC) .............................  5.50     05/01/12    10,544,500 
  7,000      Shelby County, Tennessee, Refg 1995 Ser A .......................  5.625    04/01/14     7,383,180 
 20,000      King County, Washington, Ltd Tax 1995 (MBIA)  ...................  6.00     01/01/23    21,500,600 
  2,000      Washington, 1995 Ser A  .........................................  5.80     09/01/08     2,148,660 
- ------------                                                                                       -------------- 
173,925                                                                                             160,906,780 
- ------------                                                                                       -------------- 
             Educational Facilities Revenue (6.1%) 
  1,000      California Educational Facilities Authority, Claremont Colleges 
              Ser 1992 .......................................................  6.375    05/01/22     1,065,410 
    500      Atlanta Urban Residential Finance Authority, Georgia, Morehouse                        
              College Refg Ser 1995 (MBIA)  ..................................  5.75     12/01/14       537,560 
 10,000      Indiana University, Student Fee Ser K (MBIA) ....................  5.875    08/01/20    10,659,300 
  6,000      Maryland Health & Higher Educational Facilities Authority, The                         
              John Hopkins University Refg Ser 1998 (WI) .....................  5.125    07/01/20     5,959,920 
  7,000      Massachusetts Health & Educational Facilities Authority, Boston                        
              University Ser 1991 (MBIA)  ....................................  6.66     10/01/31     7,653,240 
 15,000      New Hampshire Higher Educational & Health Facilities Authority,                        
              Dartmouth College Ser 1993  ....................................  5.375    06/01/23    15,094,950 
                                                                                                 
                      SEE NOTES TO FINANCIAL STATEMENTS 

                               39           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
PORTFOLIO OF INVESTMENTS December 31, 1997, continued 

  PRINCIPAL 
  AMOUNT IN                                                                    COUPON    MATURITY 
  THOUSANDS                                                                     RATE       DATE         VALUE 
- ----------------------------------------------------------------------------------------------------------------- 
$ 2,000      New Jersey Development Authority, The Seeing Eye Inc 1991 .......  7.30 %   04/01/11    $ 2,135,960 
  2,000      New Jersey Economic Development Authority, Educational Testing                          
              Service Ser B 1995 (MBIA) ......................................  6.125    05/15/15      2,200,560 
             New York State Dormitory Authority,                                                     
    500       City University 1994 3rd Resolution Ser 1 (AMBAC) ..............  6.30     07/01/24        556,225 
    500       Cooper Union Ser 1996 (AMBAC) ..................................  5.375    07/01/20        506,610 
  5,000       State University Ser 1989 B ....................................  0.00     05/15/02      4,137,150 
 20,000       State University Ser 1990 B ....................................  7.00     05/15/16     21,551,600 
  1,000      Virginia Polytechnic Institute & State University, Ser 1996 A ...  5.50     06/01/16      1,038,110 
- ------------                                                                                       -------------- 
 70,500                                                                                               73,096,595 
- ------------                                                                                       -------------- 
             Electric Revenue (11.0%) 
 25,000      Salt River Project Agricultural Improvement & Power District, 
              Arizona, Refg 1993 Ser C (Secondary MBIA)** ....................  5.50     01/01/10     27,129,500 
 10,000      Sacramento Municipal Utility District, California, Refg 1994 Ser                        
              I (MBIA) .......................................................  5.75     01/01/15     10,625,000 
 10,000      Municipal Electric Authority of Georgia, Ser Y (Secondary MBIA)    6.50     01/01/17     11,846,600 
  5,000      New York State Power Authority, General Purpose Ser CC ..........  5.25     01/01/18      4,993,850 
             Eugene, Oregon, Electric Utility                                                        
  1,195       Ser 1996 (FSA) .................................................  5.375    08/01/11      1,244,867 
  1,260       Ser 1996 (FSA) .................................................  5.375    08/01/12      1,305,398 
  1,000       Ser 1996 (FSA) .................................................  5.375    08/01/13      1,031,780 
             Puerto Rico Electric Power Authority,                                                   
 15,000       Power Ser O  ...................................................  0.00     07/01/17      5,523,000 
  1,500       Power Ser X  ...................................................  6.00     07/01/15      1,615,875 
 15,000      South Carolina Public Service Authority, 1995 Refg Ser A                                
              (AMBAC) ........................................................  6.25     01/01/22     16,593,900 
  1,000      Austin, Texas, Combined Utilities Refg Ser 1994 (FGIC) ..........  6.25     05/15/16      1,103,360 
 20,000      San Antonio, Texas, Electric & Gas Refg Ser 1994 C ..............  4.70     02/01/06     19,946,200 
             Intermountain Power Agency, Utah,                                                       
  2,000       Refg 1996 Ser D (Secondary FSA)  ...............................  5.00     07/01/21      1,956,720 
 10,000       Refg 1997 Ser B (MBIA)  ........................................  5.75     07/01/19     10,605,000 
 15,000      Washington Public Power Systems, Proj #2 Refg Ser 1994 A                                
              (Secondary MBIA)  ..............................................  6.00     07/01/07     16,644,300 
- ------------                                                                                       -------------- 
132,955                                                                                              132,165,350 
- ------------                                                                                       -------------- 
             Hospital Revenue (8.0%) 
 11,465      Birmingham -Carraway Special Care Facilities Financing 
              Authority, Alabama, Carraway Methodist Ser 1995 A (Connie Lee) .  6.25     08/15/09     13,041,667 
  3,000      Baxter County, Arkansas, Baxter County Regional Hospital Impr &                         
              Refg Ser 1992 ..................................................  7.50     09/01/21      3,319,020 
  5,270      Antelope Valley Healthcare District, California, Ser 1997 B                             
              (FSA)  .........................................................  5.20     01/01/17      5,275,586 
                                                                                                 
                      SEE NOTES TO FINANCIAL STATEMENTS 

                               40           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
PORTFOLIO OF INVESTMENTS December 31, 1997, continued 

  PRINCIPAL 
  AMOUNT IN                                                                    COUPON    MATURITY 
  THOUSANDS                                                                     RATE       DATE         VALUE 
- ----------------------------------------------------------------------------------------------------------------- 
$ 2,000      Orange County Health Facilities Authority, Florida, Adventist                                        
              Health/Sunbelt Ser 1995 (AMBAC) ................................  5.25 %   11/15/20   $ 1,999,880 
  8,545      Illinois Health Facilities Authority, Rockford Memorial Hospital                        
              1991 Ser B (AMBAC)  ............................................  6.75     08/15/18     9,434,876 
             Maryland Health & Higher Educational Facilities Authority,                              
  6,000       Helix Health Ser 1997 (AMBAC)  .................................  5.00     07/01/27     5,873,160 
  1,000       Kernan Hospital Ser 1994 (Connie Lee) ..........................  6.10     07/01/24     1,087,140 
  5,000      Massachusetts Health & Educational Facilities Authority,                                
              Hallmark Health System 1997 Ser A (FSA)(WI)  ...................  5.00     07/01/27     4,850,000 
             Rochester, Minnesota,                                                                   
  5,000       Mayo Foundation/Medical Center Ser 1992 I ......................  5.75     11/15/21     5,151,050 
  3,700       Mayo Foundation/Medical Center Ser 1992 F ......................  6.25     11/15/21     4,012,687 
 10,000      Missouri Health & Educational Facilities Authority,                                     
              Barnes-Jewish Inc/ Christian Health Services Ser 1993 A  .......  5.25     05/15/14    10,299,200 
  1,300      New Hampshire Higher Educational & Health Facilities Authority,                         
              St Joseph Hospital Ser 1994 (Connie Lee) .......................  6.35     01/01/07     1,454,492 
  6,000      New York State Medical Care Facilities Finance Agency,                                  
              Presbyterian Hospital -FHA Insured Mtge 1984 Ser A Refg  .......  5.25     08/15/14     6,084,360 
             University of North Carolina,                                                           
  2,000       Hospitals at Chapel Hill Ser 1996 ..............................  5.25     02/15/19     2,004,540 
  5,000       Hospitals at Chapel Hill Ser 1996 ..............................  5.00     02/15/29     4,809,050 
  2,000      Jackson, Tennessee, Jackson-Madison County General Hospital                             
              Refg & Impr Ser 1995 (AMBAC)  ..................................  5.625    04/01/15     2,088,180 
  5,000      North Central Texas Health Facilities Development Corporation,                          
              University Medical Center Inc Ser 1997 (FSA) ...................  5.45     04/01/15     5,141,950 
 10,000      Fredericksburg Industrial Development Authority, Virginia,                              
              Medicorp Health Refg Ser 1996 (AMBAC)  .........................  5.25     06/15/16    10,060,500 
- ------------                                                                                       -------------- 
 92,280                                                                                              95,987,338 
- ------------                                                                                       -------------- 
             Industrial Development/Pollution Control Revenue (6.7%) 
  1,500      Hawaii Department of Budget & Finance, Hawaiian Electric Co 
              Ser 1995 A (AMT)(MBIA) .........................................  6.60     01/01/25     1,656,510 
  1,425      Maryland Industrial Development Financing Authority, Medical                            
              Waste Assocs LP 1989 Ser (AMT) .................................  8.75     11/15/10     1,452,645 
 19,500      Claiborne County, Mississippi, Middle South Energy Inc Ser C  ...  9.875    12/01/14    21,019,830 
 10,000      Clark County, Nevada, Nevada Power Co Ser 1992 A (AMT) (FGIC) ...  6.70     06/01/22    10,998,100 
  5,000      Washoe County, Nevada, Sierra Pacific Power Co Ser 1987 (AMBAC) .  6.30     12/01/14     5,448,850 
  5,000      New York City Industrial Development Agency, New York, Brooklyn                         
              Navy Yard Cogeneration Partners, LP Proj Ser 1997 (AMT)  .......  5.75     10/01/36     5,060,850 
  5,000      Alliance Airport Authority, Texas, AMR Corp Ser 1990 (AMT) ......  7.50     12/01/29     5,466,650 
 10,000      Dallas-Fort Worth International Airport Facility Improvement                            
              Corporation, Texas, American Airlines Inc Ser 1995  ............  6.00     11/01/14    10,557,700 
                                                                                                     
                      SEE NOTES TO FINANCIAL STATEMENTS                                          

                               41           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
PORTFOLIO OF INVESTMENTS December 31, 1997, continued 

  PRINCIPAL 
  AMOUNT IN                                                                    COUPON    MATURITY 
  THOUSANDS                                                                     RATE       DATE         VALUE 
- ----------------------------------------------------------------------------------------------------------------- 
$ 7,000      Matagorda County Navigation District #1, Texas, Central Power & 
              Light Co Collateralized Ser 1984 A .............................  7.50 %   12/15/14   $ 7,612,360 
 10,000      Weston, Wisconsin, Wisconsin Public Service Corp Refg Ser 1993 A   6.90     02/01/13    11,272,900 
- ------------                                                                                       -------------- 
 74,425                                                                                              80,546,395 
- ------------                                                                                       -------------- 
             Mortgage Revenue -Multi-Family (2.3%) 
    500      Honolulu, Hawaii, Waipahu Towers GNMA Collateralized 1995 Ser A 
              (AMT) ..........................................................  6.90     06/20/35       538,120 
  1,000      Massachusetts Housing Finance Agency, Rental 1994 Ser A                                 
              (AMT)(AMBAC) ...................................................  6.65     07/01/19     1,063,090 
  6,435      Michigan Housing Development Authority, Rental Ser A (Bifurcated                        
              FSA) ...........................................................  6.50     04/01/23     6,793,108 
  9,000      New Jersey Housing & Mortgage Finance Agency, 1995 Ser A (AMBAC)   6.05     11/01/20     9,470,880 
             New York City Housing Development Corporation, New York,                                
  4,436       Rupper Proj -FHA Ins Sec 223F ..................................  6.50     11/15/18     4,658,933 
  4,293       Stevenson Commons Proj -FHA Ins Sec 223F .......................  6.50     05/15/18     4,508,119 
- ------------                                                                                       -------------- 
 25,664                                                                                              27,032,250 
- ------------                                                                                       -------------- 
             Mortgage Revenue -Single Family (6.9%) 
  7,000      Alaska Housing Finance Corporation, Governmental 1995 Ser A 
              (MBIA) .........................................................  5.875    12/01/24     7,241,500 
  2,440      California Housing Finance Agency, Home Cap Apprec 1983 Ser B  ..  0.00     08/01/15       408,310 
  2,500      Colorado Housing Finance Authority, Ser 1997 Ser C-2 (AMT)  .....  6.875    11/01/28     2,766,425 
 12,100      Illinois Housing Development Authority, Residential 1991 Ser C                          
              (AMT) ..........................................................  6.875    02/01/18    12,897,632 
             Missouri Housing Development Commission, Homeownership                                  
  3,975       GNMA -FNMA 1996 Ser C (AMT)  ...................................  7.45     09/01/27     4,508,207 
  4,000       1997 Ser C-1  ..................................................  6.55     09/01/28     4,408,440 
  5,600      Nebraska Investment Finance Authority, GNMA-Backed 1990 Ser                             
              (AMT) ..........................................................  7.631    09/10/30     5,960,696 
  3,775      North Carolina Housing Finance Agency, Ser Q (AMT) ..............  8.00     03/01/18     4,106,219 
  6,150      Ohio Housing Finance Agency, GNMA-Backed 1990 Ser A (AMT) .......  6.903    03/01/31     6,536,712 
 10,000      Pennsylvania Housing Finance Agency, Ser 1991-31 (AMT)  .........  7.00     10/01/23    10,750,800 
             Tennessee Housing Development Agency,                                                   
 11,000       Mortgage Finance 1993 Ser A ....................................  5.95     07/01/28    11,355,409 
  4,000       Mortgage Finance 1993 Ser A ....................................  5.90     07/01/18     4,141,960 
  1,000       Mortgage Finance 1994 Ser B (AMT) ..............................  6.55     07/01/19     1,058,020 
    670      Utah Housing Finance Agency, Federally Insured/Guaranteed Loans                         
              1994 Issue E (AMT) .............................................  6.50     07/01/26       702,039 
  5,800      Wisconsin Housing & Economic Development Authority, Home                                
              Ownership 1991 Ser (AMT) .......................................  7.097    10/25/22     6,172,824 
- ------------                                                                                       -------------- 
 80,010                                                                                              83,015,193 
- ------------                                                                                       -------------- 
             Public Facilities Revenue (1.6%) 
  2,000      North City West School Facilities Authority, California, 
              Community Dist #1 Special Tax Ser 1995 B (FSA) .................  6.00     09/01/19     2,178,500 
  3,500      Denver, Colorado, Excise Tax Ser 1985 A .........................  5.00     11/01/08     3,500,000 

                      SEE NOTES TO FINANCIAL STATEMENTS 

                               42           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
PORTFOLIO OF INVESTMENTS December 31, 1997, continued 

  PRINCIPAL 
  AMOUNT IN                                                                    COUPON    MATURITY 
  THOUSANDS                                                                     RATE       DATE         VALUE 
- ----------------------------------------------------------------------------------------------------------------- 
$ 6,000      Saint Louis Industrial Development Authority, Missouri, Kiel 
              Center Refg Ser 1992 (AMT) .....................................  7.75 %   12/01/13   $ 6,555,600 
  5,000      Ohio Building Authority, Correctional 1985 Ser C ................  9.75     10/01/05     6,720,400 
- ------------                                                                                       -------------- 
 16,500                                                                                              18,954,500 
- ------------                                                                                       -------------- 
             Resource Recovery Revenue (3.6%) 
             Connecticut Resources Recovery Authority, 
  7,000       American REF-FUEL Co of Southeastern Connecticut 1988 Ser A 
               (AMT) .........................................................  8.00     11/15/15     7,411,250 
  4,950       Bridgeport RESCO Ser A .........................................  7.625    01/01/09     5,139,090 
  7,000      Savannah Resource Recovery Development Authority, Georgia,                              
              Savannah Energy Systems Co Ser 1992  ...........................  6.30     12/01/06     7,527,730 
 10,000      Northeast Maryland Waste Disposal Authority, Montgomery County                          
              Ser 1993 A (AMT)  ..............................................  6.30     07/01/16    10,686,000 
  5,000      Onondaga County Resource Recovery Agency, New York, 1992 Ser                            
              (AMT)  .........................................................  6.875    05/01/06     5,346,050 
  1,750      Charleston County Resource Recovery, South Carolina, Foster                             
              Wheeler 1997 Ser (AMT)(AMBAC) ..................................  5.25     01/01/10     1,797,075 
  5,000      Fairfax County Economic Development Authority, Virginia, Ogden                          
              Martin Systems of Fairfax Inc Ser 1988 A (AMT)  ................  7.75     02/01/11     5,320,050 
- ------------                                                                                       -------------- 
 40,700                                                                                              43,227,245 
- ------------                                                                                       -------------- 
             Transportation Facilities Revenue (15.3%) 
  1,000      Lee County, Florida, Ser 1995 (MBIA)  ...........................  5.75     10/01/22     1,053,290 
             Mid-Bay Bridge Authority, Florida,                                                      
  8,965       Ser 1993 A (AMBAC)  ............................................  5.85     10/01/13     9,811,117 
  1,500       Ser 1997 A (AMBAC)  ............................................  0.00     10/01/20       459,510 
  3,000       Ser 1997 A (AMBAC)  ............................................  0.00     10/01/21       870,930 
 10,000      Atlanta, Georgia, Airport Ser 1990 (AMT)  .......................  6.25     01/01/21    10,519,600 
  8,100      Metropolitan Atlanta Rapid Transit Authority, Georgia, Sales Tax                        
              Refg Ser K .....................................................  7.25     07/01/10     8,390,709 
  5,000      Hawaii, Airports Second Ser 1991 (AMT) ..........................  7.00     07/01/18     5,447,100 
    850      Regional Transportation Authority, Illinois, Ser 1994 A .........  6.25     06/01/15       924,945 
             Kentucky Turnpike Authority,                                                            
  9,000       Economic Development Road Refg Ser 1995 (AMBAC) ................  6.50     07/01/08    10,542,510 
  1,000       Economic Development Road Refg Ser 1995 (AMBAC) ................  5.625    07/01/15     1,054,160 
 30,000       Resource Recovery Road 1987 Ser A ..............................  5.00     07/01/08    30,003,600 
  2,500      Maine Turnpike Authority, Ser 1994 (MBIA) .......................  6.00     07/01/18     2,704,025 
             Massachusetts Turnpike Authority,                                                       
 25,000       Metropolitan Highway 1997 Ser A (MBIA) .........................  5.00     01/01/37    24,168,250 
 15,000       Western 1997 Ser A (MBIA) ......................................  5.55     01/01/17    15,221,250 
 11,000      New Jersey Highway Authority, Sr Parkway Refg 1992 Ser  .........  6.25     01/01/14    11,932,250 
  6,595      Albuquerque, New Mexico, Airport Refg Ser 1997 (AMT) (AMBAC)  ...  6.375    07/01/15     7,351,315 
  1,000      New York State Thruway Authority, General 1995 Ser C (FGIC)  ....  6.00     01/01/25     1,082,490 
                                                                                                 
                      SEE NOTES TO FINANCIAL STATEMENTS 

                               43           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
PORTFOLIO OF INVESTMENTS December 31, 1997, continued 

  PRINCIPAL 
  AMOUNT IN                                                                    COUPON    MATURITY 
  THOUSANDS                                                                     RATE       DATE         VALUE 
- ----------------------------------------------------------------------------------------------------------------- 
$ 1,500      Port Authority of New York & New Jersey, Cons One Hundredth Ser 
              Second Installment++ ...........................................  5.75 %   12/15/20    $ 1,568,205 
 20,000      Ohio Turnpike Commission, 1996 Ser A (MBIA) .....................  5.50     02/15/26     20,593,200 
  5,000      Pennsylvania Turnpike Commission, Ser L of 1991 (MBIA)  .........  6.00     06/01/15      5,328,950 
 10,000      Puerto Rico Highway & Transportation Authority, Refg Ser X ......  5.50     07/01/15     10,506,900 
  4,000      Virginia Transportation Board, US Route 58 Corridor Ser 1993 B  .  5.625    05/15/13      4,137,360 
- ------------                                                                                       -------------- 
180,010                                                                                              183,671,666 
- ------------                                                                                       -------------- 
             Water & Sewer Revenue (10.8%) 
             Birmingham Water Works & Sewer Board, Alabama, 
 10,000       Ser 1994 .......................................................  5.50     01/01/20     10,181,200 
  1,000       Ser 1993-A  ....................................................  6.00     01/01/20      1,061,480 
  2,000      Jefferson County, Alabama, Sewer Refg Ser 1997-A (FGIC) .........  5.375    02/01/27      2,016,340 
 10,000      Phoenix Civic Improvement Corporation, Arizona, Jr Lien Water                           
              Ser 1994 .......................................................  5.45     07/01/19     10,245,900 
 10,000      California Department of Water Resources, Central Valley Ser L ..  5.50     12/01/23     10,108,300 
  1,000      Castaic Lake Water Agency, California, Refg Ser 1994 A COPs                             
              (MBIA) .........................................................  6.00     08/01/18      1,082,230 
 10,000      East Bay Municipal Utility District, California, Water Refg Ser                         
              1993 (MBIA)  ...................................................  5.00     06/01/21      9,717,400 
 10,000      Los Angeles, California, Wastewater Ser 1994-A (MBIA)  ..........  5.875    06/01/24     10,630,000 
  1,000      Dade County, Florida, Water & Sewer Ser 1995 (FGIC)  ............  5.50     10/01/15      1,042,290 
  5,000      Upper Oconee Basin Water Authority, Georgia, Ser 1997 (FGIC) ....  5.25     07/01/27      5,004,550 
  1,000      Chicago, Illinois, Wastewater Ser 1994 (MBIA) ...................  6.375    01/01/24      1,110,340 
             Massachusetts Water Resources Authority,                                                
  2,000       1992 Ser A  ....................................................  6.50     07/15/07      2,292,360 
 10,000       Refg 1992 Ser B ................................................  5.50     11/01/15     10,164,200 
 10,000       1993 Ser C .....................................................  5.25     12/01/15     10,245,400 
 10,000       1996 Ser A (FGIC) ..............................................  5.50     11/01/21     10,303,799 
             Detroit, Michigan,                                                                      
  4,000       Sewage Refg 1993-A (FGIC)  .....................................  5.70     07/01/13      4,206,000 
 10,000       Water Supply 1997 Ser A ........................................  5.00     07/01/21      9,770,300 
  2,000      Bayonne Municipal Utilities Authority, New Jersey, Water System                         
              Ser 1997 (MBIA) ................................................  5.00     01/01/28      1,957,400 
  2,000      Asheville, North Carolina, Water Ser 1996 (FGIC) ................  5.70     08/01/25      2,107,160 
             Philadelphia, Pennsylvania,                                                             
  1,250       Water & Wastewater Ser 1995 (MBIA)  ............................  6.25     08/01/11      1,433,338 
  5,000       Water & Wastewater Ser 1993 (FSA)  .............................  5.50     06/15/15      5,127,300 
  7,500       Water & Wastewater Ser 1997 A (AMBAC)  .........................  5.00     08/01/22      7,323,375 
  2,075      Prince William County Authority, Virginia, Water & Sewer Ser                            
              1997 (FGIC) ....................................................  4.75     07/01/29      1,949,380 
- ------------                                                                                       -------------- 
126,825                                                                                              129,080,042 
- ------------                                                                                       -------------- 

                      SEE NOTES TO FINANCIAL STATEMENTS 

                               44           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
PORTFOLIO OF INVESTMENTS December 31, 1997, continued 

  PRINCIPAL 
  AMOUNT IN                                                                    COUPON    MATURITY 
  THOUSANDS                                                                     RATE       DATE         VALUE 
- ----------------------------------------------------------------------------------------------------------------- 
             Other Revenue (1.2%) 
  $ 1,005    Mashantucket (Western) Pequot Tribe, Connecticut, Special 1996 
              Ser A (a)  .....................................................  6.50 %   09/01/05     $ 1,119,560 
    1,000    New Jersey Economic Development Authority, Market Transition Sr                         
              Lien Ser 1994 A (MBIA) .........................................  5.875    07/01/11       1,081,120 
             New York Local Government Assistance Corporation,                                       
    5,000     Ser 1994 A  ....................................................  5.50     04/01/17       5,331,950 
    5,000     Ser 1997 B (MBIA)(WI) ..........................................  4.875    04/01/20       4,825,150 
    3,000    Houston, Texas, Sr Lien Hotel Occupancy Tax Refg Ser 1995 (FSA) .  5.50     07/01/11       3,137,700 
- ------------                                                                                       -------------- 
   15,005                                                                                              15,495,480 
- ------------                                                                                       -------------- 
             Refunded (10.6%) 
    9,000    Los Angeles Convention and Exhibition Center Authority, 
              California, Ser 1985 COPs ......................................  9.00     12/01/05++    11,848,590 
      995    Mashantucket (Western) Pequot Tribe, Connecticut, Special 1996                           
              Ser A (ETM)(a)  ................................................  6.50     09/01/05       1,127,095 
    2,500    Mid-Bay Bridge Authority, Florida, Ser 1991 A (ETM)  ............  6.875    10/01/22       3,028,050 
    1,500    Hawaii, 1995 Ser CJ  ............................................  6.25     01/01/05+      1,671,360 
    1,500    Massachusetts Health & Educational Facilities Authority,                                 
              Malden Hospital -FHA Ins Mtge Ser A (ETM)  .....................  5.00     08/01/16       1,510,800 
    9,000    Massachusetts, 1994 Ser C (FGIC) ................................  6.75     11/01/04+     10,361,340 
    1,000    Essex County Improvement Authority, New Jersey, County Jail &                            
              Youth House Projects Ser 1994 (AMBAC) ..........................  6.90     12/01/04+      1,169,050 
   14,000    New York State Dormitory Authority, Suffolk County Judicial Ser                          
              1986 (ETM)  ....................................................  7.375    07/01/16      17,683,540 
    6,000    New York State Environmental Facilities Corporation, Huntington                          
              1989 Ser A (AMT)  ..............................................  7.50     10/01/99++     6,393,780 
    9,740    New York City, New York, 1990 Ser D  ............................  6.00     08/01/99+      9,946,975 
   25,000    Intermountain Power Agency, Utah, Refg 1985 Ser H GAINS  ........  0.00#    07/01/03+     25,878,000 
    5,000    Salt Lake City, Utah, IHC Hospital Inc Ser 1983 (ETM)  ..........  5.00     06/01/15       4,999,800 
   28,000    Fairfax County Industrial Development Authority, Virginia,                               
              Fairfax Hospital Inova Health Ser 1991 .........................  6.801    08/15/01+     30,946,720 
- ------------                                                                                       -------------- 
  113,235                                                                                             126,565,100 
- ------------                                                                                       -------------- 
1,142,034    TOTAL TAX-EXEMPT MUNICIPAL BONDS (Identified Cost $1,065,267,642) ..................   1,169,743,934 
- ------------                                                                                       -------------- 

                      SEE NOTES TO FINANCIAL STATEMENTS 

                               45           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
PORTFOLIO OF INVESTMENTS December 31, 1997, continued 

  PRINCIPAL 
  AMOUNT IN                                                                    COUPON    MATURITY 
  THOUSANDS                                                                     RATE       DATE         VALUE 
- ----------------------------------------------------------------------------------------------------------------- 
             SHORT-TERM TAX-EXEMPT MUNICIPAL OBLIGATIONS (1.9%) 
$   12,700   Escambia County, Florida, Gulf Power Co Ser 1997 (Demand 
              01/02/98)  .....................................................  5.05*% 07/01/22    $   12,700,000 
     6,000   Missouri Health & Educational Facilities Authority Washington 
              University Ser 1996 D (Demand 01/02/98) ........................  5.00*  02/01/30         6,000,000 
     4,000   Harris County Health Facilities Development Corporation, Texas, 
              Methodist Hospital Ser 1994 (Demand 01/02/98)  .................  4.90*  12/01/25         4,000,000 
- ------------                                                                                       -------------- 
    22,700   TOTAL SHORT-TERM TAX-EXEMPT MUNICIPAL OBLIGATIONS (Identified Cost $22,700,000)  .....    22,700,000 
- ------------                                                                                       -------------- 
$1,164,734   TOTAL INVESTMENTS (Identified Cost $1,087,967,642) (b)  ..................      99.4%  1,192,443,934 
============                                                                                                      
             CASH AND OTHER ASSETS IN EXCESS OF LIABILITIES  ..........................       0.6       6,936,765 
                                                                                            -----  -------------- 
             NET ASSETS  ..............................................................     100.0% $1,199,380,699 
                                                                                            =====  ============== 
</TABLE>
    

   
- ------------ 
AMT          Alternative Minimum Tax. 
COPs         Certificates of Participation. 
ETM          Escrowed to maturity. 
GAINS        Growth and Income Security. 
WI           Security was purchased on a when issued basis. 
++           Joint exemption in New York and New Jersey. 
+            Prerefunded to call date shown. 
++           Refunded to call date shown by forward delivery contract. 
**           This security was segregated in connection with the purchase of 
             when issued securities. 
#            Currently a zero coupon bond; will convert to 10.0% coupon on 
             July 1, 2000. 
*            Current coupon of variable rate demand obligation. 
(a)          Resale is restricted to qualified institutional investors. 
(b)          The aggregate cost for federal income tax purposes approximates 
             identified cost. The aggregate gross unrealized appreciation is 
             $105,197,572 and the aggregate gross unrealized depreciation is 
             $721,280, resulting in net unrealized appreciation of 
             $104,476,292. 

Bond Insurance: 
- ---------------
AMBAC        AMBAC Indemnity Corporation. 
Connie Lee   Connie Lee Insurance Company. 
FGIC         Financial Guaranty Insurance Company. 
FSA          Financial Security Assurance Inc. 
MBIA         Municipal Bond Investors Assurance Corporation. 
    

                      SEE NOTES TO FINANCIAL STATEMENTS 

                               46           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
PORTFOLIO OF INVESTMENTS December 31, 1997, continued 

   
GEOGRAPHIC SUMMARY OF INVESTMENTS 
Based on Market Value as a Percent of Net Assets 
December 31, 1997 
    

   
<TABLE>
<CAPTION>
<S>                <C>
Alabama               2.2% 
Alaska                4.5 
Arizona               3.1 
Arkansas              0.3 
California            5.3 
Colorado              0.5 
Connecticut           1.4 
Florida               2.6 
Georgia               3.7 
Hawaii                0.8 
Illinois              2.3 
Indiana               0.9 
Kentucky              3.5 
Maine                 0.2 
Maryland              2.1% 
Massachusetts        10.8 
Michigan              1.7 
Minnesota             0.8 
Mississippi           1.7 
Missouri              2.6 
Nebraska              0.5 
Nevada                1.8 
New Hampshire         1.4 
New Jersey            2.6 
New Mexico            0.6 
New York              9.7 
North Carolina        2.4 
Ohio                  2.9 
Oregon                0.3% 
Pennsylvania          3.4 
Puerto Rico           1.5 
South Carolina        1.5 
Tennessee             2.2 
Texas                 4.7 
Utah                  3.7 
Virginia              4.5 
Washington            3.4 
Wisconsin             1.4 
Joint Exemptions*    (0.1) 
                   ------- 
Total                99.4% 
                   ======= 
</TABLE>
    

   
 * Joint exemptions have been included in more than one geographic location. 
    

                      SEE NOTES TO FINANCIAL STATEMENTS 

                               47           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
FINANCIAL STATEMENTS 

   
STATEMENTS OF ASSETS AND LIABILITIES 
December 31, 1997 
    

   
<TABLE>
<CAPTION>
<S>                                                       <C>
ASSETS: 
Investments in securities, at value 
 (identified cost $1,087,967,642)........................  $1,192,443,934 
Cash.....................................................       8,731,624 
Receivable for: 
  Interest...............................................      17,554,911 
  Shares of beneficial interest sold.....................         853,318 
  Investments sold.......................................         404,700 
Prepaid expenses and other assets........................          42,097 
                                                           -------------- 
  TOTAL ASSETS...........................................   1,220,030,584 
                                                           -------------- 
LIABILITIES: 
Payable for: 
  Investments purchased..................................      15,332,934 
  Dividends and distributions to shareholders  ..........       4,457,299 
  Investment management fee..............................         469,410 
  Shares of beneficial interest repurchased..............         190,025 
  Plan of distribution fee...............................          53,409 
Accrued expenses and other payables......................         146,808 
                                                           -------------- 
  TOTAL LIABILITIES......................................      20,649,885 
                                                           -------------- 
NET ASSETS...............................................  $1,199,380,699 
                                                           ============== 
COMPOSITION OF NET ASSETS: 
Paid-in-capital..........................................  $1,090,477,778 
Net unrealized appreciation..............................     104,476,292 
Accumulated undistributed net investment income .........          34,517 
Accumulated undistributed net realized gain..............       4,392,112 
                                                           -------------- 
  NET ASSETS.............................................  $1,199,380,699 
                                                           ============== 
CLASS A SHARES: 
Net Assets...............................................      $3,857,465 
Shares Outstanding (unlimited authorized, $.01 par 
 value)..................................................         319,033 
NET ASSET VALUE PER SHARE................................          $12.09 
                                                                   ====== 
MAXIMUM OFFERING PRICE PER SHARE, 
 (net asset value plus 4.44% of net asset value)  .......          $12.63 
                                                                   ====== 
CLASS B SHARES: 
Net Assets...............................................     $95,572,595 
Shares Outstanding (unlimited authorized, $.01 par 
 value)..................................................       7,872,615 
  NET ASSET VALUE PER SHARE..............................          $12.14 
                                                                   ====== 
CLASS C SHARES: 
Net Assets...............................................      $2,953,120 
Shares Outstanding (unlimited authorized, $.01 par 
 value)..................................................         243,831 
  NET ASSET VALUE PER SHARE..............................          $12.11 
                                                                   ====== 
CLASS D SHARES: 
Net Assets...............................................  $1,096,997,519 
Shares Outstanding (unlimited authorized, $.01 par 
 value)..................................................      90,784,537 
  NET ASSET VALUE PER SHARE..............................          $12.08 
                                                                   ====== 

</TABLE>
    

                      SEE NOTES TO FINANCIAL STATEMENTS 


                               48           
<PAGE>
   
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
FINANCIAL STATEMENTS, continued 

STATEMENT OF OPERATIONS 
For the year ended December 31, 1997* 
    

<TABLE>
<CAPTION>
<S>                                        <C>
NET INVESTMENT INCOME: 
INTEREST INCOME...........................  $66,655,912 
                                           ------------- 
EXPENSES 
Investment management fee.................    5,004,702 
Transfer agent fees and expenses..........      359,253 
Plan of distribution fee (Class A 
 shares)..................................        2,466 
Plan of distribution fee (Class B 
 shares)..................................       83,261 
Plan of distribution fee (Class C 
 shares)..................................        4,834 
Registration fees.........................       77,286 
Professional fees.........................       61,455 
Shareholder reports and notices...........       59,993 
Custodian fees............................       48,638 
Trustees' fees and expenses...............       16,542 
Other.....................................       31,602 
                                           ------------- 
  TOTAL EXPENSES..........................    5,750,032 
Less: expense offset......................      (48,464) 
                                           ------------- 
  NET EXPENSES............................    5,701,568 
                                           ------------- 
  NET INVESTMENT INCOME...................   60,954,344 
                                           ------------- 
NET REALIZED AND UNREALIZED GAIN: 
Net realized gain.........................    9,545,783 
Net change in unrealized appreciation ....   25,338,447 
                                           ------------- 
  NET GAIN................................   34,884,230 
                                           ------------- 
NET INCREASE..............................  $95,838,574 
                                           ============= 
</TABLE>

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

* Class A, Class B and Class C shares were issued July 28, 1997. 
    

                      SEE NOTES TO FINANCIAL STATEMENTS 

                               49           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
FINANCIAL STATEMENTS, continued 

STATEMENT OF CHANGES IN NET ASSETS 

   
<TABLE>
<CAPTION>
                                                           FOR THE YEAR       FOR THE YEAR 
                                                               ENDED              ENDED 
                                                        DECEMBER 31, 1997*  DECEMBER 31, 1996 
- ------------------------------------------------------  ------------------ ----------------- 
<S>                                                     <C>                <C>
INCREASE (DECREASE) IN NET ASSETS: 
OPERATIONS: 
Net investment income .................................   $   60,954,344     $   68,165,561 
Net realized gain......................................        9,545,783          2,959,135 
Net change in unrealized appreciation .................       25,338,447        (29,830,436) 
                                                        ------------------ ----------------- 
  NET INCREASE.........................................       95,838,574         41,294,260 
                                                        ------------------ ----------------- 
DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS FROM: 
Net investment income 
 Class A shares........................................          (48,774)          -- 
 Class B shares........................................         (673,417)          -- 
 Class C shares........................................          (30,406)          -- 
 Class D shares........................................      (60,167,993)       (68,543,874) 
Net realized gain 
 Class A shares........................................          (16,080)          -- 
 Class B shares........................................         (395,740)          -- 
 Class C shares........................................          (12,228)          -- 
 Class D shares........................................       (4,910,430)        (8,374,759) 
                                                        ------------------ ----------------- 
TOTAL DIVIDENDS AND DISTRIBUTIONS......................      (66,255,068)       (76,918,633) 
                                                        ------------------ ----------------- 
Net decrease from transactions in shares of beneficial 
 interest..............................................      (20,236,797)       (99,650,138) 
                                                        ------------------ ----------------- 
  NET INCREASE (DECREASE)..............................        9,346,709       (135,274,511) 
NET ASSETS: 
Beginning of period....................................    1,190,033,990      1,325,308,501 
                                                        ------------------ ----------------- 
  END OF PERIOD 
  (Including undistributed net investment income of 
  $34,517 and $0, respectively)........................   $1,199,380,699     $1,190,033,990 
                                                        ================== ================= 
</TABLE>
    

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

* Class A, Class B and Class C shares were issued July 28, 1997. 
    

                      SEE NOTES TO FINANCIAL STATEMENTS 

                               50           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
NOTES TO FINANCIAL STATEMENTS December 31, 1997 

   
1. ORGANIZATION AND ACCOUNTING POLICIES 

Dean Witter Tax-Exempt Securities Trust (the "Fund") is registered under the 
Investment Company Act of 1940, as amended, as a diversified, open-end 
management investment company. The Fund's investment objective is to provide 
a high level of current income which is exempt from federal income tax, 
consistent with the preservation of capital. The Fund was incorporated in 
Maryland in 1979, commenced operations on March 27, 1980 and reorganized as a 
Massachusetts business trust on April 30, 1987. On July 28, 1997, the Fund 
commenced offering three additional classes of shares, with the then current 
shares designated as Class D shares. 

The Fund offers Class A shares, Class B shares, Class C shares and Class D 
shares. The four classes are substantially the same except that most Class A 
shares are subject to a sales charge imposed at the time of purchase, some 
Class A shares, and most Class B shares and Class C shares are subject to a 
contingent deferred sales charge imposed on shares redeemed within one year, 
six years and one year, respectively. Class D shares are not subject to a 
sales charge. Additionally, Class A shares, Class B shares and Class C shares 
incur distribution expenses. 

The preparation of financial statements in accordance with generally accepted 
account 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 -- Portfolio securities are valued for the Fund 
by an outside independent pricing service approved by the Trustees. The 
pricing service has informed the Fund that in valuing the Fund's portfolio 
securities, it uses both a computerized matrix of tax-exempt securities and 
evaluations by its staff, in each case based on information concerning market 
transactions and quotations from dealers which reflect the bid side of the 
market each day. The Fund's portfolio securities are thus valued by reference 
to a combination of transactions and quotations for the same or other 
securities believed to be comparable in quality, coupon, maturity, type of 
issue, call provisions, trading characteristics and other features deemed to 
be relevant. Short-term debt securities having a maturity date of more than 
sixty days at time of purchase are valued on a mark-to-market basis until 
sixty days prior to maturity and thereafter at amortized cost based on their 
value on the 61st day. Short-term debt securities having a maturity date of 
sixty days or less at the time of purchase are valued at amortized cost. 
    

                               51           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
NOTES TO FINANCIAL STATEMENTS December 31, 1997, continued 

   
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. The Fund amortizes premiums and accretes discounts over the life of 
the respective securities. Interest income is accrued daily. 

C. MULTIPLE CLASS ALLOCATIONS -- Investment income, expenses (other than 
distribution fees), and realized and unrealized gains and losses are 
allocated to each class of shares based upon the relative net asset value on 
the date such items are recognized. Distribution fees are charged directly to 
the respective class. 

D. FEDERAL INCOME TAX STATUS -- It is the Fund's policy to comply with the 
requirements of the Internal Revenue Code applicable to regulated investment 
companies and to distribute all of its taxable and nontaxable income to its 
shareholders. Accordingly, no federal income tax provision is required. 

E. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Fund records dividends 
and distributions to its shareholders on the record date. The amount of 
dividends and distributions from net investment income and net realized 
capital gains are determined in accordance with federal income tax 
regulations which may differ from generally accepted accounting principles. 
These "book/tax" differences are either considered temporary or permanent in 
nature. To the extent these differences are permanent in nature, such amounts 
are reclassified within the capital accounts based on their federal tax-basis 
treatment; temporary differences do not require reclassification. Dividends 
and distributions which exceed net investment income and net realized capital 
gains for financial reporting purposes but not for tax purposes are reported 
as dividends in excess of net investment income or distributions in excess of 
net realized capital gains. To the extent they exceed net investment income 
and net realized capital gains for tax purposes, they are reported as 
distributions of paid-in-capital. 

2. INVESTMENT MANAGEMENT AGREEMENT 

Pursuant to an Investment Management Agreement with Dean Witter InterCapital 
Inc. (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 as of the close of each 
business day: 0.50% to the portion of daily net assets not exceeding $500 
million; 0.425% to the portion of daily net assets exceeding $500 million but 
not exceeding $750 million; 0.375% to the portion of daily net assets 
exceeding $750 million but not exceeding $1 billion; 0.35% to the portion of 
daily net assets exceeding $1 billion but not exceeding $1.25 billion; and 
0.325% to the portion of daily net assets exceeding $1.25 billion. 
    

                               52           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
NOTES TO FINANCIAL STATEMENTS December 31, 1997, continued 

   
Under the terms of the Agreement, in addition to managing the Fund's 
investments, the Investment Manager maintains certain of the Fund's books and 
records and furnishes, at its own expense, office space, facilities, 
equipment, clerical, bookkeeping and certain legal services and pays the 
salaries of all personnel, including officers of the Fund who are employees 
of the Investment Manager. The Investment Manager also bears the cost of 
telephone services, heat, light, power and other utilities provided to the 
Fund. 

3. PLAN OF DISTRIBUTION 

Shares of the Fund are distributed by Dean Witter Distributors Inc. (the 
"Distributor"), an affiliate of the Investment Manager. The Fund has adopted 
a Plan of Distribution (the "Plan"), pursuant to Rule 12b-1 under the Act. 
The Plan provides that the Fund will pay the Distributor a fee which is 
accrued daily and paid monthly at the following annual rates: (i) Class A -up 
to 0.25% of the average daily net assets of Class A; (ii) Class B -0.60% of 
the average daily net assets of Class B; and (iii) Class C -up to 0.70% of 
the average daily net assets of Class C. In the case of Class A shares, 
amounts paid under the Plan are paid to the Distributor for services 
provided. In the case of Class B and Class C shares, amounts paid under the 
Plan are paid to the Distributor for services provided and the expenses borne 
by it and others in the distribution of the shares of these Classes, 
including the payment of commissions for sales of these Classes and incentive 
compensation to, and expenses of, the account executives of Dean Witter 
Reynolds Inc. ("DWR"), an affiliate of the Investment Manager and 
Distributor, and others who engage in or support distribution of the shares 
or who service shareholder accounts, including overhead and telephone 
expenses; printing and distribution of prospectuses and reports used in 
connection with the offering of these shares to other than current 
shareholders; and preparation, printing and distribution of sales literature 
and advertising materials. In addition, the Distributor may utilize fees paid 
pursuant to the Plan, in the case of Class B shares, to compensate DWR and 
other selected broker-dealers for their opportunity costs in advancing such 
amounts, which compensation would be in the form of a carrying charge on any 
unreimbursed expenses. 

In the case of Class B shares, provided that the Plan continues in effect, 
any cumulative expenses incurred by the Distributor but not yet recovered may 
be recovered through the payment of future distribution fees from the Fund 
pursuant to the Plan and contingent deferred sales charges paid by investors 
upon redemption of Class B shares. Although there is no legal obligation for 
the Fund to pay expenses incurred in excess of payments made to the 
Distributor under the Plan and the proceeds of contingent deferred sales 
charges paid by investors upon redemption of shares, if for any reason the 
Plan is terminated, the 
    

                               53           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
NOTES TO FINANCIAL STATEMENTS December 31, 1997, continued 

   
Trustees will consider at that time the manner in which to treat such 
expenses. The Distributor has advised the Fund that such excess amounts, 
including carrying charges, totaled $2,732,178 at 
December 31, 1997. 

In the case of Class A shares and Class C shares, expenses incurred pursuant 
to the Plan in any calendar year in excess of 0.25% or 0.70% of the average 
daily net assets of Class A or Class C, respectively, will not be reimbursed 
by the Fund through payments in any subsequent year, except that expenses 
representing a gross sales credit to account executives may be reimbursed in 
the subsequent calendar year. For the period ended December 31, 1997, the 
distribution fee was accrued for Class A shares and Class C shares at the 
annual rate of 0.25% and 0.70%, respectively. 

The Distributor has informed the Fund that for the period July 28, 1997 to 
December 31, 1997, it received contingent deferred sales charges from certain 
redemptions of the Fund's Class B and Class C shares of $10,314 and $530, 
respectively. For the period January 1, 1997 to July 27, 1997 it received 
$448,316 in front-end sales charges from sales of the Fund's shares and for 
the period July 28, 1997 to December 31, 1997 received $69,207 in front-end 
sales charges from sales of the Fund's Class A shares. The respective 
shareholders pay such charges which are not an expense of the Fund. 

4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES 

The cost of purchases and proceeds from sales of portfolio securities, 
excluding short-term investments, for the year ended December 31, 1997 
aggregated $170,043,446 and $253,694,468, respectively. 

Dean Witter Trust FSB, an affiliate of the Investment Manager, is the Fund's 
transfer agent. At 
December 31, 1997, the Fund had transfer agent fees and expenses payable of 
approximately $10,400. 

The Fund has an unfunded noncontributory defined benefit pension plan 
covering all independent Trustees of the Fund who will have served as 
independent Trustees for at least five years at the time of retirement. 
Benefits under this plan are based on years of service and compensation 
during the last five years of service. Aggregate pension costs for the year 
ended December 31, 1997 included in Trustees' fees and expenses in the 
Statement of Operations amounted to $2,739. At December 31, 1997, the Fund 
had an accrued pension liability of $48,294 which is included in accrued 
expenses in the Statement of Assets and Liabilities. 
    

                               54           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
NOTES TO FINANCIAL STATEMENTS December 31, 1997, continued 

5. SHARES OF BENEFICIAL INTEREST 

   
Transactions in shares of beneficial interest were as follows: 
    

<TABLE>
<CAPTION>
                                                              FOR THE YEAR                    FOR THE YEAR 
                                                                  ENDED                           ENDED 
                                                            DECEMBER 31, 1997               DECEMBER 31, 1996 
                                                     ------------------------------- ------------------------------- 
                                                         SHARES          AMOUNT          SHARES          AMOUNT 
                                                     -------------- ---------------  -------------- --------------- 
<S>                                                  <C>            <C>              <C>            <C>
CLASS A SHARES* 
Sold                                                       338,676    $   4,050,692         --              -- 
Reinvestment of dividends and distributions                  2,037           24,532         --              -- 
Redeemed                                                   (21,680)        (260,983)        --              -- 
                                                     -------------- ---------------  -------------- --------------- 
Net increase -Class A                                      319,033        3,814,241         --              -- 
                                                     -------------- ---------------  -------------- --------------- 
CLASS B SHARES* 
Sold                                                       966,475       10,102,415         --              -- 
Reinvestment of dividends and distributions                 50,270          609,389         --              -- 
Shares issued in connection with the acquisition of 
 Dean Witter National Municipal Trust                    7,189,021       86,346,821         --              -- 
Redeemed                                                  (333,151)      (2,490,026)        --              -- 
                                                     -------------- ---------------  -------------- --------------- 
Net increase -Class B                                    7,872,615       94,568,599         --              -- 
                                                     -------------- ---------------  -------------- --------------- 
CLASS C SHARES* 
Sold                                                       246,149        2,956,204         --              -- 
Reinvestment of dividends and distributions                  2,294           27,678         --              -- 
Redeemed                                                    (4,612)         (55,937)        --              -- 
                                                     -------------- ---------------  -------------- --------------- 
Net increase -Class C                                      243,831        2,927,945         --              -- 
                                                     -------------- ---------------  -------------- --------------- 
CLASS D SHARES 
Sold                                                     1,386,806       16,302,673      3,179,464    $  37,259,996 
Reinvestment of dividends and distributions              3,036,080       35,979,041      3,684,669       43,078,883 
Redeemed                                               (14,721,910)    (173,829,296)   (15,389,992)    (179,989,017) 
                                                     -------------- ---------------  -------------- --------------- 
Net decrease -Class D                                  (10,299,024)    (121,547,582)    (8,525,859)     (99,650,138) 
                                                     -------------- ---------------  -------------- --------------- 
Net decrease in Fund                                    (1,863,545)   $ (20,236,797)    (8,525,859)   $ (99,650,138) 
                                                     ============== ===============  ============== =============== 
</TABLE>

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

* For the period July 28, 1997 (issue date) through December 31, 1997. 

6. ACQUISITION OF DEAN WITTER NATIONAL MUNICIPAL TRUST 

As of the close of business on November 7, 1997, the Fund acquired all the 
net assets of Dean Witter National Municipal Trust ("National Municipal") 
pursuant to a plan of reorganization approved by the shareholders of National 
Municipal on October 24, 1997. The acquisition was accomplished by a tax-free 
exchange of 7,189,021 Class B shares of the Fund at a net asset value of 
$12.01 per share for 7,972,312 shares of National Municipal. The net assets 
of the Fund and National Municipal immediately before the acquisition were
$1,108,511,637 and $86,346,821, respectively, including unrealized appreciation
of $5,153,021. Immediately after the acquisition, the combined net assets of 
the Fund amounted to $1,194,858,458. 
    

                               55           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
FINANCIAL HIGHLIGHTS 

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

   
<TABLE>
<CAPTION>
                                                                  FOR THE YEAR ENDED DECEMBER 31, 
                                  ----------------------------------------------------------------------------------------------- 
   
                                    1997*     1996     1995      1994      1993      1992     1991      1990      1989     1988 
- --------------------------------  -------- --------  -------- ---------  -------- --------  -------- --------  --------  -------- 
   
<S>                               <C>      <C>       <C>      <C>        <C>      <C>       <C>      <C>       <C>       <C>
CLASS D SHARES 
PER SHARE OPERATING PERFORMANCE: 
Net asset value, beginning of 
 period..........................  $11.77    $12.09   $11.01    $12.41    $11.88    $11.65   $11.09    $11.28    $10.96   $10.45 
                                  -------- --------  -------- ---------  -------- --------  -------- --------  --------  -------- 
   
Net investment income ...........    0.63      0.65     0.67      0.70      0.77      0.79     0.80      0.80      0.81     0.81 
Net realized and unrealized gain 
 (loss)..........................    0.36     (0.24)    1.19     (1.37)     0.54      0.23     0.56     (0.18)     0.32     0.51 
                                  -------- --------  -------- ---------  -------- --------  -------- --------  --------  -------- 
   
Total from investment 
 operations......................    0.99      0.41     1.86     (0.67)     1.31      1.02     1.36      0.62      1.13     1.32 
                                  -------- --------  -------- ---------  -------- --------  -------- --------  --------  -------- 
   
Less dividends and distributions 
 from: 
 Net investment income...........   (0.63)    (0.65)   (0.67)    (0.70)    (0.77)    (0.79)   (0.80)    (0.81)    (0.81)   (0.81) 
   
 Net realized gain...............   (0.05)    (0.08)   (0.11)    (0.03)    (0.01)     --       --        --        --       -- 
                                  -------- --------  -------- ---------  -------- --------  -------- --------  --------  -------- 
   
Total dividends and 
 distributions...................   (0.68)    (0.73)   (0.78)    (0.73)    (0.78)    (0.79)   (0.80)    (0.81)    (0.81)   (0.81) 
   
                                  -------- --------  -------- ---------  -------- --------  -------- --------  --------  -------- 
   
Net asset value, end of period ..  $12.08    $11.77   $12.09    $11.01    $12.41    $11.88   $11.65    $11.09    $11.28   $10.96 
                                  ======== ========  ======== =========  ======== ========  ======== ========  ========  ======== 
   
TOTAL INVESTMENT RETURN +........    8.73%     3.61%   17.37%    (5.55)%   11.23%     9.09%   12.71%     5.86%    10.61%   13.02% 
   
RATIOS TO AVERAGE NET ASSETS: 
Expenses.........................    0.49%     0.48%    0.48%     0.47%     0.47%     0.49%    0.51%     0.51%     0.51%    0.54% 
   
Net investment income............    5.34%     5.52%    5.76%     6.02%     6.23%     6.74%    7.05%     7.25%     7.31%    7.51% 
   
SUPPLEMENTAL DATA: 
Net assets, end of period, in 
 millions........................  $1,097    $1,190   $1,325    $1,295    $1,582    $1,323   $1,145    $1,010    $1,033   $  908 
Portfolio turnover rate..........      16%       18%      21%       16%       13%        4%      10%       19%       13%      17% 
   
</TABLE>
    

- ------------ 
*     Prior to July 28, 1997, the Fund issued one class of shares. All shares 
      of the Fund held prior to that date have been designated Class D shares. 
+     Calculated based on the net asset value as of the last business day of 
      the period. 

                      SEE NOTES TO FINANCIAL STATEMENTS 

                               56           
<PAGE>
   
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
FINANCIAL HIGHLIGHTS, continued 
    

   
<TABLE>
<CAPTION>
                                            FOR THE PERIOD 
                                            JULY 28, 1997* 
                                               THROUGH 
                                          DECEMBER 31, 1997 
- ----------------------------------------  ----------------- 
<S>                                       <C>
CLASS A SHARES 
PER SHARE OPERATING PERFORMANCE: 
Net asset value, beginning of period ....      $ 12.00 
                                          ----------------- 
Net investment income ...................         0.25 
Net realized and unrealized gain ........         0.14 
                                          ----------------- 
Total from investment operations  .......         0.39 
                                          ----------------- 
Less dividends and distributions from: 
 Net investment income ..................        (0.25) 
 Net realized gain ......................        (0.05) 
                                          ----------------- 
Total dividends and distributions  ......        (0.30) 
                                          ----------------- 
Net asset value, end of period ..........      $ 12.09 
                                          ================= 
TOTAL INVESTMENT RETURN +................         3.31%(1) 
RATIOS TO AVERAGE NET ASSETS: 
Expenses ................................         0.76%(2)(3) 
Net investment income ...................         4.96%(2) 
SUPPLEMENTAL DATA: 
Net assets, end of period, in thousands        $ 3,857 
Portfolio turnover rate..................           16% 

CLASS B SHARES 
PER SHARE OPERATING PERFORMANCE: 
Net asset value, beginning of period ....      $ 12.00 
                                          ----------------- 
Net investment income ...................         0.23 
Net realized and unrealized gain ........         0.19 
                                          ----------------- 
Total from investment operations  .......         0.42 
                                          ----------------- 
Less dividends and distributions from: 
 Net investment income ..................        (0.23) 
 Net realized gain ......................        (0.05) 
                                          ----------------- 
Total dividends and distributions  ......        (0.28) 
                                          ----------------- 
Net asset value, end of period ..........      $ 12.14 
                                          ================= 
TOTAL INVESTMENT RETURN +................         3.57%(1) 
RATIOS TO AVERAGE NET ASSETS: 
Expenses ................................         1.14%(2)(3) 
Net investment income ...................         4.87%(2) 
SUPPLEMENTAL DATA: 
Net assets, end of period, in thousands        $95,573 
Portfolio turnover rate .................           16% 
</TABLE>
    

   
- ------------ 
*       The date shares were first issued. 
+       Does not reflect the deduction of sales charge. Calculated based on 
        the net asset value as of the last business day of the period. 
(1)     Not annualized.              
(2)     Annualized.                 
(3)     Does not reflect the effect of expense offset of 0.02%. 

                      SEE NOTES TO FINANCIAL STATEMENTS 
    

                               57           
<PAGE>
   
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
FINANCIAL HIGHLIGHTS, continued 
    

   
<TABLE>
<CAPTION>
                                            FOR THE PERIOD 
                                            JULY 28, 1997* 
                                               THROUGH 
                                          DECEMBER 31, 1997 
- ----------------------------------------  ----------------- 
<S>                                       <C>
CLASS C SHARES 
PER SHARE OPERATING PERFORMANCE: 
Net asset value, beginning of period ....       $12.00 
                                          ----------------- 
Net investment income ...................         0.23 
Net realized and unrealized gain ........         0.16 
                                          ----------------- 
Total from investment operations  .......         0.39 
                                          ----------------- 
Less dividends and distributions from: 
 Net investment income ..................        (0.23) 
 Net realized gain ......................        (0.05) 
                                          ----------------- 
Total dividends and distributions  ......        (0.28) 
                                          ----------------- 
Net asset value, end of period ..........       $12.11 
                                          ================= 
TOTAL INVESTMENT RETURN+ ................         3.28%(1) 
RATIOS TO AVERAGE NET ASSETS: 
Expenses.................................         1.20%(2)(3) 
Net investment income ...................         4.41%(2) 
SUPPLEMENTAL DATA: 
Net assets, end of period, in thousands         $2,953 
Portfolio turnover rate .................           16% 
</TABLE>
    

   
- ------------ 
*       The date shares were first issued.  
+       Does not reflect the deduction of sales charge. Calculated based on 
        the net asset value as of the last business day of the period. 
(1)     Not annualized.              
(2)     Annualized.                  
(3)     Does not reflect the effect of expense offset of 0.02%. 
    

                      SEE NOTES TO FINANCIAL STATEMENTS 

                               58           
<PAGE>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
REPORT OF INDEPENDENT ACCOUNTANTS 

   
TO THE SHAREHOLDERS AND TRUSTEES 
OF DEAN WITTER TAX-EXEMPT 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 
Tax-Exempt Securities Trust (the "Fund") at December 31, 1997, the results of 
its operations for the year then ended, the changes in its net assets for 
each of the two years in the period then ended and the financial highlights 
for each of the periods presented, in conformity with generally accepted 
accounting principles. These financial statements and financial highlights 
(hereafter referred to as "financial statements") are the responsibility of 
the Fund's management; our responsibility is to express an opinion on these 
financial statements based on our audits. We conducted our audits of these 
financial statements in accordance with generally accepted auditing standards 
which require that we plan and perform the audit to obtain reasonable 
assurance about whether the financial statements are free of material 
misstatement. An audit includes examining, on a test basis, evidence 
supporting the amounts and disclosures in the financial statements, assessing 
the accounting principles used and significant estimates made by management, 
and evaluating the overall financial statement presentation. We believe that 
our audits, which included confirmation of securities at December 31, 1997 by 
correspondence with the custodian and brokers, provide a reasonable basis for 
the opinion expressed above. 

PRICE WATERHOUSE LLP 
1177 Avenue of the Americas 
New York, New York 10036 
February 10, 1998 

                     1997 FEDERAL TAX NOTICE (UNAUDITED) 

       During the year ended December 31, 1997, the Fund paid to shareholders 
       the following per share amounts from net investment income: Class A, 
       $0.25; Class B, $0.23; Class C, $0.23; and Class D, $0.63 per share. 
       All of the Fund's dividends from net investment income were exempt 
       interest dividends, excludable from gross income for Federal income tax 
       purposes. For the year ended December 31, 1997, the Fund paid to Class 
       A, B, C and D shareholders $0.05 per share from long-term capital 
       gains. Of this $0.05 distribution, $0.04 is taxable as 28% rate gain 
       and $0.01 is taxable as 20% rate gain. 
    

<PAGE>
APPENDIX 

RATINGS OF INVESTMENTS 
- ----------------------------------------------------------------------------- 

MOODY'S INVESTORS SERVICE INC. ("MOODY'S") 

                            MUNICIPAL BOND RATINGS 

<TABLE>
<CAPTION>
<S>      <C>
Aaa      Bonds which are rated Aaa are judged to be of the best quality. They carry the smallest degree of investment 
         risk and are generally referred to as "gilt edge." Interest payments are protected by a large or by an 
         exceptionally stable margin and principal is secure. While the various protective elements are likely to 
         change, such changes as can be visualized are most unlikely to impair the fundamentally strong position 
         of such issues. 

Aa       Bonds which are rated Aa are judged to be of high quality by all standards. Together with the Aaa group 
         they comprise what are generally known as high grade bonds. They are rated lower than the best bonds because 
         margins of protection may not be as large as in Aaa securities or fluctuation of protective elements may 
         be of greater amplitude or there may be other elements present which make the long-term risks appear somewhat 
         larger than in Aaa securities. 

A        Bonds which are rated A possess many favorable investment attributes and are to be considered as upper 
         medium grade obligations. Factors giving security to principal and interest are considered adequate, but 
         elements may be present which suggest a susceptibility to impairment sometime in the future. 

Baa      Bonds which are rated Baa are considered as medium grade obligations; i.e., they are neither highly protected 
         nor poorly secured. Interest payments and principal security appear adequate for the present but certain 
         protective elements may be lacking or may be characteristically unreliable over any great length of time. 
         Such bonds lack outstanding investment characteristics and in fact have speculative characteristics as 
         well. 

         Bonds rated Aaa, Aa, A and Baa are considered investment grade bonds. 

Ba       Bonds which are rated Ba are judged to have speculative elements; their future cannot be considered as 
         well assured. Often the protection of interest and principal payments may be very moderate, and therefore 
         not well safeguarded during both good and bad times in the future. Uncertainty of position characterizes 
         bonds in this class. 

B        Bonds which are rated B generally lack characteristics of a desirable investment. Assurance of interest 
         and principal payments or of maintenance of other terms of the contract over any long period of time may 
         be small. 

Caa      Bonds which are rated Caa are of poor standing. Such issues may be in default or there may be present elements 
         of danger with respect to principal or interest. 

Ca       Bonds which are rated Ca present obligations which are speculative in a high degree. Such issues are often 
         in default or have other marked shortcomings. 

C        Bonds which are rated C are the lowest rated class of bonds, and issues so rated can be regarded as having 
         extremely poor prospects of ever attaining any real investment standing. 
</TABLE>

   Conditional Rating: Bonds for which the security depends upon the 
completion of some act or the fulfillment of some condition are rated 
conditionally. These bonds are secured by (a) earnings of projects under 
construction, (b) earnings of projects unseasoned in operation experience, 
(c) rentals which begin when facilities are completed or (d) payments to 
which some other limiting condition attaches. Parenthetical rating denotes 
probable credit stature upon completion of construction or elimination of 
basis of condition. 

                               60           
<PAGE>
   Rating Refinements: Moody's may apply numerical modifiers, 1, 2, and 3 in 
each generic rating classification from Aa though B in its municipal bond 
rating system. The modifier 1 indicates that the security ranks in the higher 
end of its generic rating category; the modifier 2 indicates a mid-range 
ranking; and a modifier 3 indicates that the issue ranks in the lower end of 
its generic rating category. 

                            MUNICIPAL NOTE RATINGS 

   Moody's ratings for state and municipal note and other short-term loans 
are designated Moody's Investment Grade (MIG). MIG 1 denotes best quality and 
means there is present strong protection from established cash flows, 
superior liquidity support or demonstrated broad-based access to the market 
for refinancing. MIG 2 denotes high quality and means that margins of 
protection are ample although not as large as in MIG 1. MIG 3 denotes 
favorable quality and means that all security elements are accounted for but 
that the undeniable strength of the previous grades, MIG 1 and MIG 2, is 
lacking. MIG 4 denotes adequate quality and means that the protection 
commonly regarded as required of an investment security is present and that 
while the notes are not distinctly or predominantly speculative, there is 
specific risk. 

                       VARIABLE RATE DEMAND OBLIGATIONS 

   A short-term rating, in addition to the Bond or MIG ratings, designated 
VMIG may also be assigned to an issue having a demand feature. The assignment 
of the VMIG symbol reflects such characteristics as payment upon periodic 
demand rather than fixed maturity dates and payment relying on external 
liquidity. The VMIG rating criteria are identical to the MIG criteria 
discussed above. 

                           COMMERCIAL PAPER RATINGS 

   Moody's Commercial Paper ratings are opinions of the ability to repay 
punctually promissory obligations not having an original maturity in excess 
of nine months. These ratings apply to Municipal Commercial Paper as well as 
taxable Commercial Paper. Moody's employs the following three designations, 
all judged to be investment grade, to indicate the relative repayment 
capacity of rated issuers: Prime-1, Prime-2, Prime-3. 

   Issuers rated Prime-1 have a superior capacity for repayment of short-term 
promissory obligations. Issuers rated Prime-2 have a strong capacity for 
repayment of short-term promissory obligations; and Issuers rated Prime-3 
have an acceptable capacity for repayment of short-term promissory 
obligations. Issuers rated Not Prime do not fall within any of the Prime 
rating categories. 

STANDARD & POOR'S CORPORATION ("STANDARD & POOR'S") 

                            MUNICIPAL BOND RATINGS 

   A Standard & Poor's municipal bond rating is a current assessment of the 
creditworthiness of an obligor with respect to a specific obligation. This 
assessment may take into consideration obligors such as guarantors, insurers 
or lessees. 

   The ratings are based on current information furnished by the issuer or 
obtained by Standard & Poor's from other sources it considers reliable. The 
ratings are based, in varying degrees, on the following considerations: (1) 
likelihood of default-capacity and willingness of the obligor as to the 
timely payment of interest and repayment of principal in accordance with the 
terms of the obligation; (2) nature of and provisions of the obligation; and 
(3) protection afforded by, and relative position of the obligation in the 
event of bankruptcy, reorganization or other arrangement under the laws of 
bankruptcy and other laws affecting creditors' rights. 

   Standard & Poor's does not perform an audit in connection with any rating 
and may, on occasion,rely on unaudited financial information. The ratings may 
be changed, suspended or withdrawn as a result of changes in, or 
unavailability of, such information, or for other reasons. 

                               61           
<PAGE>
<TABLE>
<CAPTION>
<S>      <C>
AAA      Debt rated "AAA" has the highest rating assigned by Standard & Poor's. Capacity to pay interest and repay 
         principal is extremely strong. 

AA       Debt rated "AA" has a very strong capacity to pay interest and repay principal and differs from the highest-rated 
         issues only in small degree. 

A        Debt rated "A" has a strong capacity to pay interest and repay principal although they are somewhat more susceptible 
         to the adverse effects of changes in circumstances and economic conditions than debt in higher-rated categories. 

BBB      Debt rated "BBB" is regarded as having an adequate capacity to pay interest and repay principal. Whereas it 
         normally eibits adequate protection parameters, adverse economic conditions or changing circumstances are 
         more likely to lead to a weakened capacity to pay interest and repay principal for debt in this category than 
         for debt in higher-rated categories. 

         Bonds rated AAA, AA, A and BBB are considered investment grade bonds. 

BB       Debt rated "BB" has less near-term vulnerability to default than other speculative grade debt. However, it 
         faces major ongoing uncertainties or exposure to adverse business, financial or economic conditions which 
         would lead to inadequate capacity or willingness to pay interest and repay principal. 

B        Debt rated "B" has a greater vulnerability to default but presently has the capacity to meet interest payments 
         and principal repayments. Adverse business, financial or economic conditions would likely impair capacity 
         or willingness to pay interest and repay principal. 

CCC      Debt rated "CCC" has a current identifiable vulnerability to default, and is dependent upon favorable business, 
         financial and economic conditions to meet timely payments of interest and repayments of principal. In the 
         event of adverse business, financial or economic conditions, it is not likely to have the capacity to pay 
         interest and repay principal. 

CC       The rating "CC" is typically applied to debt subordinated to senior debt which is assigned an actual or implied 
         "CCC" rating. 

C        The rating "C" is typically applied to debt subordinated to senior debt which is assigned an actual or implied 
         "CCC-" debt rating. 

Cl       The rating "Cl" is reserved for income bonds on which no interest is being paid. 

D        Debt rated "D" is in payment default. The 'D' rating category is used when interest payments or principal 
         payments are not made on the date due even if the applicable grace period has not expired, unless S&P believes 
         that such payments will be made during such grace period. The 'D' rating also will be used upon the filing 
         of a bankruptcy petition if debt service payments are jeopardized. 

NR       Indicates that no rating has been requested, that there is insufficient information on which to base a rating 
         or that Standard & Poor's does not rate a particular type of obligation as a matter of policy. 

         Bonds rated "BB", "B", "CCC", "CC" and "C" are regarded as having predominantly speculative characteristics 
         with respect to capacity to pay interest and repay principal. "BB" indicates the least degree of speculation 
         and "C" the highest degree of speculation. While such debt will likely have some quality and protective characteristics, 
         these are outweighed by large uncertainties or major risk exposures to adverse conditions. 

         Plus (+) or minus(-): The ratings from "AA" to "CCC" may be modified by the addition of a plus or minus sign 
         to show relative standing within the major ratings categories. 
</TABLE>

                               62           
<PAGE>

The foregoing ratings are sometimes followed by a "p" which indicates that the
rating is provisional. A provisional rating assumes the successful completion
of the project being financed by the bonds being rated and indicates that
payment of debt service requirements is largely or entirely dependent upon the
successful and timely completion of the project. This rating, however, while
addressing credit quality subsequent to completion of the project, makes no
comment on the likelihood or risk of default upon failure of such completion.

                            MUNICIPAL NOTE RATINGS 

   Commencing on July 27, 1984, Standard & Poor's instituted a new rating 
category with respect to certain municipal note issues with a maturity of 
less than three years. The new note ratings denote the following: 

     SP-1 denotes a very strong or strong capacity to pay principal and 
    interest. Issues determined to possess overwhelming safety characteristics 
    are given a plus (+) designation (SP-1+). 

     SP-2 denotes a satisfactory capacity to pay principal and interest. 

     SP-3 denotes a speculative capacity to pay principal and interest. 

                           COMMERCIAL PAPER RATINGS 

   Standard and Poor's commercial paper rating is a current assessment of the 
likelihood of timely payment of debt having an original maturity of no more 
than 365 days. The commercial paper rating is not a recommendation to 
purchase or sell a security. The ratings are based upon current information 
furnished by the issuer or obtained by S&P from other sources it considers 
reliable. The ratings may be changed, suspended, or withdrawn as a result of 
changes in or unavailability of such information. Ratings are graded into 
group categories, ranging from "A" for the highest quality obligations to "D" 
for the lowest. Ratings are applicable to both taxable and tax-exempt 
commercial paper. The categories are as follows: 

     Issues assigned A ratings are regarded as having the greatest capacity 
    for timely payment. Issues in this category are further refined with the 
    designation 1, 2 and 3 to indicate the relative degree of safety. 

     A-1 indicates that the degree of safety regarding timely payments is very 
    strong. 

     A-2 indicates capacity for timely payment on issues with this designation 
    is strong. However, the relative degree of safety is not as overwhelming 
    as for issues designated "A-1". 

     A-3 indicates a satisfactory capacity for timely payment. Obligations 
    carrying this designation are, however, somewhat more vulnerable to the 
    adverse effects of changes in circumstances than obligations carrying the 
    higher designations. 

                               63           


<PAGE>

                     DEAN WITTER TAX-EXEMPT SECURITIES TRUST

                            PART C OTHER INFORMATION

Item 24.  Financial Statements and Exhibits
<TABLE>
<CAPTION>

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

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

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

           Portfolio of Investments at December 31, 1997..................................39

           Statement of Assets and Liabilities at December 31,1997........................48

           Statement of Operations for the year ended December 31, 1997.................. 49

           Statement of Changes in Net Assets for the years ended
           December 31, 1996 and December 31, 1997........................................50

           Notes to Financial Statements..................................................51

           Financial Highlights for the years ended December 31, 1988, 1989,
           1990, 1991, 1992, 1993, 1994, 1995, 1996, and 1997
           (Class D)......................................................................56

           Financial Highlights for the period July 28, 1997 through
           December 31, 1997 (Class A, B and C)...........................................57
</TABLE>

       (3) Financial statements included in Part C:

           None

    (b) Exhibits:
        ---------
        2.- Amended and Restated By-Laws of the Registrant dated as of October
            23, 1997

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

       11.- Consent of Independent Accountants

       16.- Schedules for Computation of Performance Quotations


<PAGE>


       27.- Financial Data Schedules

    Other.- Power of Attorney

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

Item 25. Persons Controlled by or Under Common Control With Registrant.
         --------------------------------------------------------------

         None

Item 26. Number of Holders of Securities.
         --------------------------------

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

         Class A                                         266
         Class B                                       2,641
         Class C                                         106
         Class D                                      23,061

Item 27. Indemnification.
         ----------------

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

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

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



<PAGE>


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

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

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

Item 28. Business and Other Connections of Investment Adviser.
         -----------------------------------------------------

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

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

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

<PAGE>


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

<PAGE>



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

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

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

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

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

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

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

<PAGE>


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

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

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

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

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

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

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

Edward C. Oelsner III
Executive Vice President

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

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

<PAGE>


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

Richard Felegy
Senior Vice President

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

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

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

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

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

Margaret Iannuzzi
Senior Vice President

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

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

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

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

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

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

<PAGE>





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

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

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

Elizabeth A. Vetell
Senior Vice President

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

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

Douglas Brown
First Vice President

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

Thomas Chronert
First Vice President

Rosalie Clough
First Vice President

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

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

David Johnson
First Vice President

Stanley Kapica
First Vice President

<PAGE>



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

Dale Albright
Vice President

Joan G. Allman
Vice President

Andrew Arbenz
Vice President

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

Nancy Belza
Vice President

Maurice Bendrihem
Vice President and Assistant
Controller

Joseph Cardwell
Vice President

Philip Casparius
Vice President

B. Catherine Connelly
Vice President

Salvatore DeSteno              Vice President of DWSC.
Vice President

Bruce Dunn
Vice President

Michael Durbin
Vice President

Jeffrey D. Geffen
Vice President

Michael Geringer
Vice President

<PAGE>

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

Peter W. Gurman
Vice President

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

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

Elizabeth Hinchman
Vice President

David Hoffman
Vice President

Christopher Jones
Vice President

Kevin Jung
Vice President

James P. Kastberg
Vice President

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

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

Thomas Lawlor
Vice President

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

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

Albert McGarity
Vice President

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

<PAGE>


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

Julie Morrone
Vice President

Mary Beth Mueller
Vice President

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

Richard Norris
Vice President

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

George Paoletti
Vice President

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

Michael Roan
Vice President

John Roscoe
Vice President

Hugh Rose
Vice President

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

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

Carl F. Sadler
Vice President

Deborah Santaniello
Vice President

<PAGE>


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

Naomi Stein
Vice President

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

Marybeth Swisher
Vice President

Robert Vanden Assem
Vice President

James P. Wallin
Vice President

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

Item 29. Principal Underwriters
         ----------------------

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

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

<PAGE>


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

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

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

Michael T. Gregg                    Vice President and Assistant
                                    Secretary.

Item 30. Location of Accounts and Records
         --------------------------------

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

Item 31. Management Services
         -------------------

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

Item 32. Undertakings
         ------------

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



<PAGE>

                                   SIGNATURES
                                   ----------

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

                             DEAN WITTER TAX-EXEMPT 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. 21 has been signed below by the following persons
in the capacities and on the dates indicated.
<TABLE>
<CAPTION>

 Signatures                                 Title                                        Date
 ----------                                 -----                                        ----
<S>                                         <C>                                         <C>
(1) Principal Executive Officer             President, Chief
                                            Executive Officer,
                                            Trustee and Chairman
By  /s/ Charles A. Fiumefreddo
  ------------------------------                                                         4/17/98
        Charles A. Fiumefreddo

(2) Principal Financial Officer             Treasurer and Principal
                                            Accounting Officer

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

(3) Majority of the Trustees

    Charles A. Fiumefreddo (Chairman)
    Philip J. Purcell

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

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



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

<PAGE>

                     DEAN WITTER TAX-EXEMPT SECURITIES TRUST
                     ---------------------------------------
                                  EXHIBIT INDEX

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

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

  11. Consent of Independent Accountants.

  16. Schedules for Computation of Performance Quotations.

  27. Financial Data Schedules.

  Other. Power of Attorney.









<PAGE>
                                   BY-LAWS 

                                      OF 

                   DEAN WITTER TAX-EXEMPT SECURITIES TRUST 
                 AMENDED AND RESTATED AS OF OCTOBER 23, 1997 

                                  ARTICLE I 
                                 DEFINITIONS 

   The terms "Commission," "Declaration," "Distributor," "Investment 
Adviser," "Majority Shareholder Vote," "1940 Act," "Shareholder," "Shares," 
"Transfer Agent," "Trust," "Trust Property," and "Trustees" have the 
respective meanings given them in the Declaration of Trust of Dean Witter 
Tax-Exempt Securities Trust dated April 6, 1987, as amended from time to 
time. 

                                  ARTICLE II 
                                   OFFICES 

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

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

                                 ARTICLE III 
                            SHAREHOLDERS' MEETINGS 

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

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

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

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

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

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

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

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

   SECTION 3.8. Inspection of Books and Records. Shareholders shall have such 
rights and procedures of inspection of the books and records of the Trust as 
are granted to Shareholders under the Corporations and Associations Law of 
the State of Maryland. 

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

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

                                2           
<PAGE>
                                  ARTICLE IV 
                                   TRUSTEES 

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

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

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

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

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

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

   SECTION 4.7.  Execution of Instruments and Documents and Signing of Checks 
and Other Obligations and Transfers. All instruments, documents and other 
papers shall be executed in the name and on behalf of the Trust and all 
checks, notes, drafts and other obligations for the payment of money by the 
Trust shall be signed, and all transfer of securities standing in the name of 
the Trust shall be executed, by the Chairman, the President, any Vice 
President or the Treasurer or by any one or more officers or agents of the 
Trust as shall be designated for that purpose by vote of the Trustees; 
notwithstanding the above, nothing in this Section 4.7 shall be deemed to 
preclude the electronic authorization, by designated persons, of the Trust's 
Custodian (as described herein in Section 9.1) to transfer assets of the 
Trust, as provided for herein in Section 9.1. 

   SECTION 4.8. Indemnification of Trustees, Officers, Employees and 
Agents. (a) The Trust shall indemnify any person who was or is a party or is 
threatened to be made a party to any threatened, pending, or completed 
action, suit or proceeding, whether civil, criminal, administrative or 
investigative 

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

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

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

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

       (2) The determination shall be made: 

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

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

     (iii) By the Shareholders. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

                                  ARTICLE V 
                                  COMMITTEES 

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

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

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

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

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

                                  ARTICLE VI 
                                   OFFICERS 

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

   SECTION 6.2. Other Officers and Agents. The Trustees may also elect one or 
more Assistant Vice Presidents, Assistant Secretaries and Assistant 
Treasurers and may elect, or may delegate to the Chairman the power to 
appoint, such other officers and agents as the Trustees shall at any time or 
from time to time deem advisable. 

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

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

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

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

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

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

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

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

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

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

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

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

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

                                 ARTICLE VII 
                         DIVIDENDS AND DISTRIBUTIONS 

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

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

                                 ARTICLE VIII 
                            CERTIFICATES OF SHARES 

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

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

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

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

                                  ARTICLE IX 
                                  CUSTODIAN 

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

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

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

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

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

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

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

                                  ARTICLE X 
                               WAIVER OF NOTICE 

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

                                  ARTICLE XI 
                                MISCELLANEOUS 

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

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

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

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

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

                                 ARTICLE XII 
                     COMPLIANCE WITH FEDERAL REGULATIONS 

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

                                 ARTICLE XIII 
                                  AMENDMENTS 

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

                                 ARTICLE XIV 
                             DECLARATION OF TRUST 

   The Declaration of Trust establishing Dean Witter Tax-Exempt Securities 
Trust, dated April 6, 1987, a copy of which is on file in the office of the 
Secretary of the Commonwealth of Massachusetts, provides that the name Dean 
Witter Tax-Exempt 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 
Tax-Exempt 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 Tax-Exempt Securities Trust, but the Trust Estate only shall be 
liable. 

                               10           







<PAGE>
                             AMENDED AND RESTATED 
                    TRANSFER AGENCY AND SERVICE AGREEMENT 
                                     WITH 
                            DEAN WITTER TRUST FSB 

 
<PAGE>
                              TABLE OF CONTENTS 

<TABLE>
<CAPTION>
                                                                      PAGE 
                                                                   -------- 
<S>             <C>                                                <C>
Article 1       Terms of Appointment...............................    1 
Article 2       Fees and Expenses..................................    2 
Article 3       Representations and Warranties of DWTFSB ..........    3 
Article 4       Representations and Warranties of the Fund ........    3 
Article 5       Duty of Care and Indemnification...................    3 
Article 6       Documents and Covenants of the Fund and DWTFSB ....    4 
Article 7       Duration and Termination of Agreement..............    5 
Article 8       Assignment ........................................    5 
Article 9       Affiliations.......................................    6 
Article 10      Amendment..........................................    6 
Article 11      Applicable Law.....................................    6 
Article 12      Miscellaneous......................................    6 
Article 13      Merger of Agreement................................    7 
Article 14      Personal Liability.................................    7 
</TABLE>

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

   AMENDED AND RESTATED AGREEMENT made as of the 23rd day of October, 1997 by 
and between each of the Funds listed on the signature pages hereof, each of 
such Funds acting severally on its own behalf and not jointly with any of 
such other Funds (each such Fund hereinafter referred to as the "Fund"), each 
such Fund having its principal office and place of business at Two World 
Trade Center, New York, New York, 10048, and DEAN WITTER TRUST FSB 
("DWTFSB"), a federally chartered savings bank, having its principal office 
and place of business at Harborside Financial Center, Plaza Two, Jersey City, 
New Jersey 07311. 

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

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

Article 1 Terms of Appointment; Duties of DWTFSB 

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

   1.2 DWTFSB agrees that it will perform the following services: 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

     (c) In addition, the Fund shall: 

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

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

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

Article 2 Fees and Expenses 

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

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

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

                                2           
<PAGE>
Article 3 Representations and Warranties of DWTFSB 

   DWTFSB represents and warrants to the Fund that: 

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

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

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

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

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

Article 4 Representations and Warranties of the Fund 

   The Fund represents and warrants to DWTFSB that: 

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

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

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

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

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

Article 5 Duty of Care and Indemnification 

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

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

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

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

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

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

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

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

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

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

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

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

Article 6 Documents and Covenants of the Fund and DWTFSB 

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

     (a) If a corporation: 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Article 7 Duration and Termination of Agreement 

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

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

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

Article 8 Assignment 

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

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

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

Article 9 Affiliations 

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

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

Article 10 Amendment 

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

Article 11 Applicable Law 

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

Article 12 Miscellaneous 

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

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

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

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

To the Fund: 

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

Attention: General Counsel 

To DWTFSB: 

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

Attention: President 

Article 13 Merger of Agreement 

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

Article 14 Personal Liability 

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

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

DEAN WITTER FUNDS 

   MONEY MARKET FUNDS 

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

   EQUITY FUNDS 

10. Dean Witter American Value Fund 
11. Dean Witter Mid-Cap Growth Fund 

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

   BALANCED FUNDS 

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

   ASSET ALLOCATION FUNDS 

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

   FIXED INCOME FUNDS 

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

                                8           
<PAGE>
   SPECIAL PURPOSE FUNDS 

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

   TCW/DW FUNDS 

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

                                                By: 
                                                    -------------------------- 
                                                    Barry Fink 
                                                    Vice President and 
                                                    General Counsel 

ATTEST: 
- -------------------------------- 
Assistant Secretary 

                                                DEAN WITTER TRUST FSB 
                                                By: 
                                                    -------------------------- 
                                                    John Van Heuvelen 
                                                    President 

ATTEST: 
- --------------------------------
Executive Vice President 

                                9           
<PAGE>
                                  EXHIBIT A 

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

Gentlemen: 

   The undersigned, (insert name of investment company) a (Massachusetts 
business trust/Maryland corporation) (the "Fund"), desires to employ and 
appoint Dean Witter Trust FSB ("DWTFSB") to act as transfer agent for each 
series and class of shares of the Fund, whether now or hereafter authorized 
or issued ("Shares"), dividend disbursing agent and shareholder servicing 
agent, registrar and agent in connection with any accumulation, open-account 
or similar plan provided to the holders of Shares, including without 
limitation any periodic investment plan or periodic withdrawal plan. 

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

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

                                          Very truly yours, 
                                          (name of fund) 
                                          By: 
                                              ------------------------------- 
                                              Barry Fink 
                                              Vice President and General 
                                              Counsel 
ACCEPTED AND AGREED TO: 
DEAN WITTER TRUST FSB 
By: 
    ------------------------------------------------------------------------- 
Its: 
      ----------------------------------------------------------------------- 
Date: 
      ----------------------------------------------------------------------- 

                               10           

<PAGE>

                              SCHEDULE A

Fund:   Dean Witter Tax-Exempt Securities Trust

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

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

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

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

                               11



<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. 21 to the registration
statement on Form N-1A (the "Registration Statement") of our report dated
February 10, 1998, relating to the financial statements and financial
highlights of Dean Witter Tax-Exempt Securities Trust, which appears in such
Statement of Additional Information, and to the incorporation by reference of
our report into the Prospectus which constitutes part of this Registration
Statement. We also consent to the references to us under the headings
"Independent Accountants" and "Experts" in such Statement of Additional
Information and to the reference to us under the heading "Financial Highlights"
in such Prospectus.

/s/ Price Waterhouse LLP
- ----------------------------
PRICE WATERHOUSE LLP
1177 Avenue of the Americas
New York, New York 10036
April 16, 1998




<PAGE>

                   SCHEDULE OF COMPUTATION OF YIELD QUOTATION
                     DEAN WITTER TAX EXEMPT SECURITIES TRUST
                                     CLASS A
                  FOR THE 30 DAY PERIOD ENDED DECEMBER 31, 1997

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


          WHERE: a = Dividends and interest earned during the period

                 b = Expenses accrued for the period

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

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

                                                                            6
                 YIELD = 2{ [((15,374.02 - 2,231.56)/301,542.858 *12.63)+1] -1}

                            = 4.18%


      (B)         TAX EQUIVALENT YIELD = SEC Yield - (1- stated tax rate) 
                                       = 4.18% / (1-.3960) 
                                       = 6.92.%

      (A)        15,374.02 - 2,231.56 =                               13,142.46
                 301,542.858 * 12.63 =                             3,808,486.30
                 13,142.46/3,808,486.30 =                             0.0034508
                 1+.0034508 =                                         1.0034508
                 1.0034508 ^ 6 =                            1.02088424428350447
                 .02088424428350447 * 2 =                                 4.18%

      (B)        1 - .3960=                                               0.604
                 4.18%/0.604=                                             6.92%


<PAGE>
                   SCHEDULE OF COMPUTATION OF YIELD QUOTATION
                     DEAN WITTER TAX EXEMPT SECURITIES TRUST
                                     CLASS B
                  FOR THE 30 DAY PERIOD ENDED DECEMBER 31, 1997




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


                 WHERE: a = Dividends and interest earned during the period

                        b = Expenses accrued for the period

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

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

                                                                            6
             YIELD = 2{ [((396,388.65 - 84,467.12)/7,744,367.152 *12.14)+1] -1}

                   = 4.01%


      (B)              TAX EQUIVALENT YIELD = SEC Yield -(1- stated tax rate) 
                                            = 4.01% / (1-.3960) 
                                            = 6.64%






      (A)        396,388.65 - 84,467.12 =                            311,921.53
                 7,744,367.152 * 12.14 =                          94,016,617.23
                 311,921.53/94,016,617.23 =                           0.0033177
                 1 + .0033177 =                                       1.0033177
                 1.0033177 ^ 6 =                            1.02007203918644018
                 .02007203918644*2=                                        4.01%

      (B)        1-.3960=                                                0.604
                 4.01%/0.604=                                             6.64%


<PAGE>
                   SCHEDULE OF COMPUTATION OF YIELD QUOTATION
                     DEAN WITTER TAX EXEMPT SECURITIES TRUST
                                     CLASS C
                  FOR THE 30 DAY PERIOD ENDED DECEMBER 31, 1997




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


                 WHERE:     a = Dividends and interest earned during the period

                            b = Expenses accrued for the period

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

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



                                                                          6
                 YIELD = 2{ [((9,999.90 - 2,364.27)/195,758.967 *12.11)+1] -1}

                       = 3.90%


      (B)        TAX EQUIVALENT YIELD = SEC Yield - (1- stated tax rate) 
                                      = 3.90% / (1-.3960) 
                                      = 6.46%






      (A)        9,999.90 -2,364.27 =                                  7,635.63
                 195,758.967 * 12.11 =                             2,370,641.09
                 7,635.63/2,370,641.09 =                              0.0032209
                 1 + .0032209 =                                       1.0032209
                 1.0032209 ^ 6 =                            1.01948168285360049
                 .0194816828536 * 2=                                       3.90%

      (B)        1-.3960=                                                 0.604
                 3.90%/0.604=                                              6.46%



<PAGE>

                   SCHEDULE OF COMPUTATION OF YIELD QUOTATION
                     DEAN WITTER TAX EXEMPT SECURITIES TRUST
                                     CLASS D
                  FOR THE 30 DAY PERIOD ENDED DECEMBER 31, 1997




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


                 WHERE:     a = Dividends and interest earned during the period

                            b = Expenses accrued for the period

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

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



                                                                             6
            YIELD = 2{[((4,622,094.62 - 443,041.07)/90,723,964.119 *12.08)+1]-1}

                  = 4.62%


      (B)          TAX EQUIVALENT YIELD = SEC Yield - (1-stated tax rate) 
                                        = 4.62% / (1-.3960) 
                                        = 7.65%






      (A)        4,622,094.62 - 443,041.07 =                       4,179,053.55
                 90,723,964.119 * 12.08 =                      1,095,945,486.56
                 4,179,053.55/1,095,945,486.56 =                      0.0038132
                 1 + .0038132 =                                       1.0038132
                 1.0038132 ^ 6 =                            1.02309841950608264
                 .02309841950608264 * 2 =                                  4.62%

      (B)        1-.3960=                                                 0.604
                 4.62%/0.604=                                              7.65%

<PAGE>

    SCHEDULE FOR RESTATED COMPUTATIONS OF PERFORMANCE QUOTATIONS RESTATED FOR
      12B-1 FEE DEAN WITTER TAX-EXEMPT  SECURITIES - CLASS A

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

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

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

                                                                   (A)
  $1,000         ERV AS OF       AGGREGATE      NUMBER OF    AVERAGE ANNUAL
INVESTED - P     31-Dec-97      TOTAL RETURN    YEARS - n    COMPOUND RETURN - T
- ------------     ----------     ------------    ----------   -------------------

31-Dec-96       $   1,038.60         3.86%         1            3.86%

31-Dec-92       $   1,313.70        31.37%         5            5.61%

31-Dec-87       $   2,111.10       111.11%        10            7.76%

(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:                 |      |        EV           |
                         |      |      --------       |  - 1
             t =         |    n |         P           |  
                         |  /\  |                     |              
                         |    \ |                     |   
                         |     \|                     | 
                         |                            |
                          -                          - 

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


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


                              (C)                            (B)
  $1,000        EV AS OF      TOTAL          NUMBER OF       AVERAGE ANNUAL
INVESTED - P    31-Dec-97     RETURN - TR    YEARS - n       COMPOUND RETURN - t
- ------------    ---------     -----------    ----------      -------------------

31-Dec-96       $   1,084.70         8.47%       1                  8.47%
                                                      
31-Dec-92       $   1,372.00        37.20%       5                  6.53%
                                                      
31-Dec-87       $   2,204.80       120.48%      10                  8.23%
                                                      
                                                  
(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>


                TOTAL           GROWTH OF                      GROWTH OF                  GROWTH OF
INVESTED - P   RETURN - TR      $10,000  INVESTMENT - E       $50,000  INVESTMENT - F     $100,000 INVESTMENT - G
- -------------  ------------     -----------------------       -----------------------     ------------------------
<S>            <C>              <C>                           <C>                         <C>    
27-Mar-80       389.18                    $ 46,839                    $236,029                     $475,728
</TABLE>

*SINCE INCEPTION : ORIGINAL VALUE $9,575,$48,250 & $97,250 ADJUSTED FOR 
 4.25%,3.50% AND 2.75% SALES CHARGES, RESPECTIVELY.

<PAGE>


               SCHEDULE FOR COMPUTATIONS OF PERFORMANCE QUOTATIONS
                   DEAN WITTER TAX-EXEMPT SECURITIES - Class B


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

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


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

                                                            (A)
 $1,000           ERV AS OF     AGGREGATE      NUMBER OF     AVERAGE ANNUAL
INVESTED - P      31-Dec-97     TOTAL RETURN   YEARS - n     COMPOUND RETURN - T
- ------------     -----------    -------------  ----------    -------------------
28-Jul-97          $985.70         -1.43%         0.43             NA


(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:                 |      |        EV           |
                         |      |      --------       |  - 1
             t =         |    n |         P           |  
                         |  /\  |                     |              
                         |    \ |                     |   
                         |     \|                     | 
                         |                            |
                          -                          - 


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

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


                              (C)                            (B)
 $1,000          EV AS OF      TOTAL           NUMBER OF     AVERAGE ANNUAL
INVESTED - P     31-Dec-97     RETURN - TR     YEARS - n     COMPOUND RETURN - t
- -------------    ----------    -----------     ----------    -------------------
28-Jul-97        $1,035.70        3.57%           0.43           NA


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

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

                    TOTAL           (D) GROWTH OF               (E) GROWTH OF              (F) GROWTH OF
INVESTED - P        RETURN - TR     $10,000 INVESTMENT - G       $50,000 INVESTMENT - G     $100,000 INVESTMENT - G 
- -------------       ------------    -----------------------     -----------------------    -------------------------
<S>                 <C>             <C>                         <C>                        <C> 
28-Jul-97               3.57               $10,357                      $51,785                     $103,570
</TABLE>
<PAGE>


               SCHEDULE FOR COMPUTATIONS OF PERFORMANCE QUOTATIONS
                   DEAN WITTER TAX-EXEMPT SECURITIES - Class C


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

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


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

                                                            (A)
 $1,000         ERV AS OF     AGGREGATE       NUMBER OF      AVERAGE ANNUAL
INVESTED - P    31-Dec-97     TOTAL RETURN    YEARS - n      COMPOUND RETURN - T
- ------------    ----------   -------------    ----------     -------------------
 28-Jul-97       $1,022.80       2.28%           0.43               NA


(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:                 |      |        EV           |
                         |      |      --------       |  - 1
             t =         |    n |         P           |  
                         |  /\  |                     |              
                         |    \ |                     |   
                         |     \|                     | 
                         |                            |
                          -                          - 


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


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


                               (C)                          (B)
$1,000           EV AS OF      TOTAL         NUMBER OF      AVERAGE ANNUAL
INVESTED - P     31-Dec-97     RETURN - TR   YEARS - n      COMPOUND RETURN - t
- ------------     ---------     ------------  -----------    -------------------
28-Jul-97        $1,032.80         3.28%        0.43               NA


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

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

<TABLE>
<CAPTION>

                       TOTAL               (D) GROWTH OF                  (E) GROWTH OF                   (F) GROWTH OF
INVESTED - P           RETURN - TR         $10,000 INVESTMENT - G         $50,000 INVESTMENT - G           $100,000INVESTMENT - G 
- --------------       ---------------       ----------------------       --------------------------         ------------------------
<S>                  <C>                   <C>                          <C>                                <C>     
 28-Jul-97               3.28                       $10,328                        $51,640                        $103,280

</TABLE>

<PAGE>




               SCHEDULE FOR COMPUTATIONS OF PERFORMANCE QUOTATIONS
                   DEAN WITTER TAX-EXEMPT SECURITIES - Class D




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

(B) TOTAL RETURN(NO LOAD FUND

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

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

                           (B)                             (A)
  $1,000      ERV AS OF     TOTAL            NUMBER OF      AVERAGE ANNUAL
INVESTED - P  31-Dec-97     RETURN - TR      YEARS - n      COMPOUND RETURN - T
- ------------  ---------    -------------    -----------    --------------------
31-Dec-96     $1,087.30         8.73%            1                 8.73%

31-Dec-92     $1,389.10        38.91%            5                 6.79%

31-Dec-87     $2,260.00       126.00%           10                 8.50%


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


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


                   TOTAL              (C) GROWTH OF                  (D) GROWTH OF                   (E) GROWTH OF
INVESTED - P       RETURN - TR        $10,000  INVESTMENT -G         $50,000  INVESTMENT -G         $100,000  INVESTMENT -G       
- -------------      ------------      ------------------------       -----------------------        --------------------------
<S>                <C>               <C>                            <C>                             <C>     
  27-Mar-80           411.18                 $51,118                       $255,590                        $511,180
</TABLE>


<PAGE>

These calculations use the old 4.0% FESC and will be included in theSAI only.
Legal want this in the SAI so that old Tax-Exempt shareholders can get an
accurate measure of thier performance. See HYLAX adjusted.

               SCHEDULE FOR COMPUTATIONS OF PERFORMANCE QUOTATIONS
                   DEAN WITTER TAX-EXEMPT SECURITIES - Class D



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

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

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

                                                             (A)
  $1,000       ERV AS OF     AGGREGATE         NUMBER OF     AVERAGE ANNUAL
INVESTED - P   31-Dec-97     TOTAL RETURN      YEARS - n     COMPOUND RETURN - T
- -----------   -----------    -------------    -------------  ------------------
31-Dec-96      $1,043.80         4.38%              1               4.38%

31-Dec-92      $1,333.50        33.35%           5.00               5.93%

31-Dec-87      $2,169.60       116.96%          10.00               8.05%



(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:                 |      |        EV           |
                         |      |      --------       |  - 1
             t =         |    n |         P           |  
                         |  /\  |                     |              
                         |    \ |                     |   
                         |     \|                     | 
                         |                            |
                          -                          - 


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

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


                              (C)                           (B)
$1,000          EV AS OF       TOTAL            NUMBER OF    AVERAGE ANNUAL
INVESTED - P    31-Dec-97      RETURN - TR      YEARS - n    COMPOUND RETURN - t
- ------------    ---------     -------------    ------------  ------------------
 31-Dec-96       $1,087.30       8.73%                1           8.73%

 31-Dec-92       $1,389.10      38.91%             5.00           6.79%

 31-Dec-87       $2,260.00     126.00%            10.00           8.50%

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

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

<PAGE>


<TABLE>
<CAPTION>

                               (D)                        (E)                      (F)
$10,000        TOTAL  
          GROWTH OF                 GROWTH OF                 GROWTH OF
INVESTED - P   RETURN - TR      $10,000 INVESTMENT - G    $50,000 INVESTMENT - G    $100,000INVESTMENT - G    
- ------------   -----------      -----------------------   ----------------------   -------------------------
<S>            <C>              <C>                       <C>                      <C>     
27-Mar-80         411.18            $49,074                       $247,283                  $497,123
</TABLE>

* INITIAL INVESTMENT $9600,$48,375 & $97,250 RESPECTIVELY REFLECTS A 4%,
  3.25% & 2.75% SALES CHARGE









<TABLE> <S> <C>

<PAGE>


<ARTICLE> 6
<SERIES>
<NUMBER>  1
<NAME>    SERIES A
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                    1,087,967,642
<INVESTMENTS-AT-VALUE>                   1,192,443,934
<RECEIVABLES>                               18,812,929
<ASSETS-OTHER>                               8,773,721
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           1,220,030,584
<PAYABLE-FOR-SECURITIES>                    15,332,934
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    5,316,951
<TOTAL-LIABILITIES>                         20,649,885
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,090,477,778
<SHARES-COMMON-STOCK>                                0
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       34,517
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      4,392,112
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   104,476,292
<NET-ASSETS>                                         0
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           66,655,912
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               5,701,568
<NET-INVESTMENT-INCOME>                     60,954,344
<REALIZED-GAINS-CURRENT>                     9,545,783
<APPREC-INCREASE-CURRENT>                   25,338,447
<NET-CHANGE-FROM-OPS>                       95,838,574
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                       9,346,709
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                      162,708
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        5,004,702
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,750,032
<AVERAGE-NET-ASSETS>                                 0
<PER-SHARE-NAV-BEGIN>                                0
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                                  0
<EXPENSE-RATIO>                                      0
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        







</TABLE>

<TABLE> <S> <C>

<PAGE>



<ARTICLE> 6
<SERIES>
<NUMBER>  2
<NAME>    SERIES B
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                    1,087,967,642
<INVESTMENTS-AT-VALUE>                   1,192,443,934
<RECEIVABLES>                               18,812,929
<ASSETS-OTHER>                               8,773,721
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           1,220,030,584
<PAYABLE-FOR-SECURITIES>                    15,332,934
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    5,316,951
<TOTAL-LIABILITIES>                         20,649,885
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,090,477,778
<SHARES-COMMON-STOCK>                          319,033
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       34,517
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      4,392,112
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   104,476,292
<NET-ASSETS>                                 3,857,465
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           66,655,912
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               5,701,568
<NET-INVESTMENT-INCOME>                     60,954,344
<REALIZED-GAINS-CURRENT>                     9,545,783
<APPREC-INCREASE-CURRENT>                   25,338,447
<NET-CHANGE-FROM-OPS>                       95,838,574
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (48,774)
<DISTRIBUTIONS-OF-GAINS>                      (16,080)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        338,676
<NUMBER-OF-SHARES-REDEEMED>                     21,680
<SHARES-REINVESTED>                              2,037
<NET-CHANGE-IN-ASSETS>                       9,346,709
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                      162,708
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        5,004,702
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,750,032
<AVERAGE-NET-ASSETS>                         2,322,415
<PER-SHARE-NAV-BEGIN>                            12.00
<PER-SHARE-NII>                                   0.25
<PER-SHARE-GAIN-APPREC>                           0.14
<PER-SHARE-DIVIDEND>                            (0.25)
<PER-SHARE-DISTRIBUTIONS>                       (0.05)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.09
<EXPENSE-RATIO>                                   0.76
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        





</TABLE>

<TABLE> <S> <C>

<PAGE>



<ARTICLE> 6
<SERIES>
<NUMBER>  3
<NAME>    SERIES C
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                    1,087,967,642
<INVESTMENTS-AT-VALUE>                   1,192,443,934
<RECEIVABLES>                               18,812,929
<ASSETS-OTHER>                               8,773,721
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           1,220,030,584
<PAYABLE-FOR-SECURITIES>                    15,332,934
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    5,316,951
<TOTAL-LIABILITIES>                         20,649,885
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,090,477,778
<SHARES-COMMON-STOCK>                        7,872,615
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       34,517
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      4,392,112
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   104,476,292
<NET-ASSETS>                                95,572,595
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           66,655,912
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               5,701,568
<NET-INVESTMENT-INCOME>                     60,954,344
<REALIZED-GAINS-CURRENT>                     9,545,783
<APPREC-INCREASE-CURRENT>                   25,338,447
<NET-CHANGE-FROM-OPS>                       95,838,574
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (673,417)
<DISTRIBUTIONS-OF-GAINS>                     (395,740)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      8,155,496
<NUMBER-OF-SHARES-REDEEMED>                    333,151
<SHARES-REINVESTED>                             50,270
<NET-CHANGE-IN-ASSETS>                       9,346,709
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                      162,708
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        5,004,702
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,750,032
<AVERAGE-NET-ASSETS>                        32,677,718
<PER-SHARE-NAV-BEGIN>                            12.00
<PER-SHARE-NII>                                   0.23
<PER-SHARE-GAIN-APPREC>                           0.19
<PER-SHARE-DIVIDEND>                            (0.23)
<PER-SHARE-DISTRIBUTIONS>                       (0.05)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.14
<EXPENSE-RATIO>                                   1.14
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        







</TABLE>

<TABLE> <S> <C>

<PAGE>






<ARTICLE> 6
<SERIES>
<NUMBER>  4
<NAME>    SERIES D
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                    1,087,967,642
<INVESTMENTS-AT-VALUE>                   1,192,443,934
<RECEIVABLES>                               18,812,929
<ASSETS-OTHER>                               8,773,721
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           1,220,030,584
<PAYABLE-FOR-SECURITIES>                    15,332,934
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    5,316,951
<TOTAL-LIABILITIES>                         20,649,885
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,090,477,778
<SHARES-COMMON-STOCK>                          243,831
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       34,517
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      4,392,112
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   104,476,292
<NET-ASSETS>                                 2,953,120
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           66,655,912
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               5,701,568
<NET-INVESTMENT-INCOME>                     60,954,344
<REALIZED-GAINS-CURRENT>                     9,545,783
<APPREC-INCREASE-CURRENT>                   25,338,447
<NET-CHANGE-FROM-OPS>                       95,838,574
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (30,406)
<DISTRIBUTIONS-OF-GAINS>                      (12,228)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        246,149
<NUMBER-OF-SHARES-REDEEMED>                      4,612
<SHARES-REINVESTED>                              2,294
<NET-CHANGE-IN-ASSETS>                       9,346,709
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                      162,708
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        5,004,702
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,750,032
<AVERAGE-NET-ASSETS>                         1,626,134
<PER-SHARE-NAV-BEGIN>                            12.00
<PER-SHARE-NII>                                   0.23
<PER-SHARE-GAIN-APPREC>                           0.16
<PER-SHARE-DIVIDEND>                            (0.23)
<PER-SHARE-DISTRIBUTIONS>                       (0.05)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.11
<EXPENSE-RATIO>                                   1.20
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        







</TABLE>

<TABLE> <S> <C>

<PAGE>






<ARTICLE> 6
<SERIES>
<NUMBER>  5
<NAME>    SERIES E
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                    1,087,967,642
<INVESTMENTS-AT-VALUE>                   1,192,443,934
<RECEIVABLES>                               18,812,929
<ASSETS-OTHER>                               8,773,721
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           1,220,030,584
<PAYABLE-FOR-SECURITIES>                    15,332,934
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    5,316,951
<TOTAL-LIABILITIES>                         20,649,885
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,090,477,778
<SHARES-COMMON-STOCK>                       90,784,537
<SHARES-COMMON-PRIOR>                      101,083,561
<ACCUMULATED-NII-CURRENT>                       34,517
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      4,392,112
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   104,476,292
<NET-ASSETS>                             1,096,997,519
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           66,655,912
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               5,701,568
<NET-INVESTMENT-INCOME>                     60,954,344
<REALIZED-GAINS-CURRENT>                     9,545,783
<APPREC-INCREASE-CURRENT>                   25,338,447
<NET-CHANGE-FROM-OPS>                       95,838,574
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (60,167,993)
<DISTRIBUTIONS-OF-GAINS>                   (4,910,430)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,386,806
<NUMBER-OF-SHARES-REDEEMED>                 14,721,910
<SHARES-REINVESTED>                          3,036,080
<NET-CHANGE-IN-ASSETS>                       9,346,709
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                      162,708
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        5,004,702
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,750,032
<AVERAGE-NET-ASSETS>                     1,127,937,505
<PER-SHARE-NAV-BEGIN>                            11.77
<PER-SHARE-NII>                                   0.63
<PER-SHARE-GAIN-APPREC>                           0.36
<PER-SHARE-DIVIDEND>                            (0.63)
<PER-SHARE-DISTRIBUTIONS>                       (0.05)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.08
<EXPENSE-RATIO>                                   0.49
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        







</TABLE>

<PAGE>

                                POWER OF ATTORNEY
                                -----------------


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

Dated: September 1, 1997



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


<PAGE>


                                   Schedule A


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

<PAGE>


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






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