WITTER DEAN INTERMEDIATE INCOME SECURITIES
497, 1996-11-01
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<PAGE>
                        DEAN WITTER
                        INTERMEDIATE INCOME SECURITIES
                        PROSPECTUS--OCTOBER 25, 1996
 
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DEAN  WITTER  INTERMEDIATE  INCOME  SECURITIES  (THE  "FUND")  IS  AN  OPEN-END,
DIVERSIFIED MANAGEMENT INVESTMENT  COMPANY, WHOSE INVESTMENT  OBJECTIVE IS  HIGH
CURRENT  INCOME CONSISTENT WITH  SAFETY OF PRINCIPAL. THE  FUND SEEKS TO ACHIEVE
ITS INVESTMENT OBJECTIVE BY INVESTING PRIMARILY IN INTERMEDIATE TERM, INVESTMENT
GRADE FIXED-INCOME SECURITIES. SEE "INVESTMENT OBJECTIVE AND POLICIES."
 
Shares of  the  Fund are  continuously  offered  at net  asset  value.  However,
redemptions  and/or  repurchases  are  subject in  most  cases  to  a contingent
deferred sales charge, scaled down from 5% to 1% of the amount redeemed, if made
within six  years  of  purchase,  which  charge  will  be  paid  to  the  Fund's
Distributor,    Dean   Witter    Distributors   Inc.    See   "Redemptions   and
Repurchases--Contingent Deferred Sales Charge." In  addition, the Fund pays  the
Distributor  a distribution fee pursuant to a Plan of Distribution at the annual
rate of 0.85% of the lesser of the (i) average daily aggregate net sales or (ii)
average daily net  assets of  the Fund. See  "Purchase of  Fund Shares--Plan  of
Distribution."
 
This  Prospectus sets  forth concisely  the information  you should  know before
investing in the  Fund. It  should be read  and retained  for future  reference.
Additional  information  about  the  Fund  is  contained  in  the  Statement  of
Additional Information, dated October  25, 1996, 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.
 
<TABLE>
<CAPTION>
TABLE OF CONTENTS
 
<S>                                                 <C>
Prospectus Summary................................       2
Summary of Fund Expenses..........................       3
Financial Highlights..............................       4
The Fund and its Management.......................       5
Investment Objective and Policies.................       5
Risk Considerations...............................       8
Investment Restrictions...........................       8
Purchase of Fund Shares...........................       8
Shareholder Services..............................      10
Redemptions and Repurchases.......................      12
Dividends, Distributions and Taxes................      13
Performance Information...........................      14
Additional Information............................      14
</TABLE>
 
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.
 
DEAN WITTER
INTERMEDIATE INCOME SECURITIES
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
(212) 392-2550 or (800) 869-NEWS (toll-free)
 
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  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>
<S>             <C>
THE FUND        The  Fund is organized as a Trust, commonly known as a Massachusetts business trust, and
                is an open-end, diversified management investment company. The Fund invests primarily in
                intermediate term, investment grade fixed-income securities.
- -------------------------------------------------------------------------------------------------------
 
SHARES OFFERED  Shares of beneficial interest with $0.01 par value (see page 14).
- -------------------------------------------------------------------------------------------------------
 
OFFERING PRICE  At net  asset value  (see page  8). Shares  redeemed within  six years  of purchase  are
                subject to a contingent deferred sales charge under most circumstances (see page 12).
- -------------------------------------------------------------------------------------------------------
 
MINIMUM         The  minimum  initial  investment is  $1,000  ($100  if the  account  is  opened through
PURCHASE        EasyInvest-SM-) and the minimum subsequent investment is $100 (see page 8).
- -------------------------------------------------------------------------------------------------------
 
INVESTMENT      The investment objective of the  Fund is high current  income consistent with safety  of
OBJECTIVE       principal.
- -------------------------------------------------------------------------------------------------------
 
INVESTMENT      Dean  Witter InterCapital Inc. ("InterCapital"), the Investment Manager of the Fund, and
MANAGER         its wholly-owned  subsidiary,  Dean  Witter  Services Company  Inc.,  serve  in  various
                investment  management,  advisory,  management  and  administrative  capacities  to  100
                investment companies and other portfolios with assets of approximately $86.5 billion  at
                September 30, 1996 (see page 5).
- -------------------------------------------------------------------------------------------------------
 
MANAGEMENT      The  Investment Manager receives a monthly fee at  the annual rate of 0.60% of daily net
FEE             assets, scaled down on assets over $500 million (see page 5).
- -------------------------------------------------------------------------------------------------------
 
DIVIDENDS       Dividends are declared daily, and either paid  monthly in additional shares of the  Fund
                or, at the shareholder's option, paid monthly in cash.
- -------------------------------------------------------------------------------------------------------
 
DISTRIBUTOR     Dean  Witter Distributors Inc. (the "Distributor") receives from the Fund a distribution
AND             fee accrued daily and paid monthly at the rate  of 0.85% per annum of the lesser of  (i)
DISTRIBUTION    the  Fund's  average daily  aggregate net  sales or  (ii) the  Fund's average  daily net
FEE             assets. The fee compensates the Distributor for services provided in distributing shares
                of the Fund and for sales-related  expenses. The Distributor also receives the  proceeds
                of any contingent deferred sales charges (see page 9).
- -------------------------------------------------------------------------------------------------------
 
REDEMPTION--    Redeemable  at net asset value, involuntarily redeemed if the total value of the account
CONTINGENT      is less than $100 or, if the account was opened through EasyInvest-SM-, if after  twelve
DEFERRED SALES  months  the  shareholder has  invested  less than  $1,000  in the  account.  Although no
CHARGE          commission or sales charge is imposed upon the purchase of shares, a contingent deferred
                sales charge (scaled  down from 5%  to 1%) is  imposed on any  redemption of shares  if,
                after  such redemption, the aggregate current value of  an account with the Fund is less
                than the aggregate amount of the investor's purchase payments made during the six  years
                preceding  the redemption. However, there  is no charge imposed  on redemption of shares
                purchased through reinvestment of dividends or distributions (see page 12).
- -------------------------------------------------------------------------------------------------------
 
RISK            The net asset value of the Fund's shares will fluctuate with changes in the market value
CONSIDERATIONS  of its portfolio securities. Interest rate fluctuations will affect the Fund's net asset
                value but not the income  received by the Fund from  its portfolio securities. The  Fund
                may  engage in  various investment  strategies including  reverse repurchase agreements,
                when-issued and delayed delivery securities and forward commitments and when, as and  if
                issued  securities. The  risks associated with  these investments are  included in their
                description (pages 5-7) and in the "Risk Considerations" section (page 8).
- -------------------------------------------------------------------------------------------------------
</TABLE>
 
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                          ELSEWHERE IN THIS PROSPECTUS
                  AND THE STATEMENT OF ADDITIONAL INFORMATION.
 
2
<PAGE>
SUMMARY OF FUND EXPENSES
- --------------------------------------------------------------------------------
 
The  following table illustrates all expenses and fees that a shareholder of the
Fund will incur. The expenses and fees set forth in the table are for the fiscal
year ended August 31, 1996.
 
<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES
<S>                                                                                                <C>
Maximum Sales Charge Imposed on Purchases........................................................  None
Maximum Sales Charge Imposed on Reinvested Dividends.............................................  None
Deferred Sales Charge
 (as a percentage of the lesser of original purchase price or redemption proceeds)...............  5.0%
</TABLE>
 
 A contingent deferred sales charge is imposed at the following declining rates:
 
<TABLE>
<CAPTION>
YEAR SINCE PURCHASE PAYMENT MADE                    PERCENTAGE
- --------------------------------------------------  ----------
<S>                                                 <C>
First.............................................       5.0%
Second............................................       4.0%
Third.............................................       3.0%
Fourth............................................       2.0%
Fifth.............................................       2.0%
Sixth.............................................       1.0%
Seventh and thereafter............................     None
</TABLE>
 
<TABLE>
<S>                                                                                               <C>
Redemption Fees.................................................................................       None
Exchange Fee....................................................................................       None
 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management Fees.................................................................................      0.60%
12b-1 Fees*.....................................................................................      0.85%
Other Expenses..................................................................................      0.17%
Total Fund Operating Expenses...................................................................      1.62%
</TABLE>
 
- ------------------------
* A portion of  the 12b-1 fee  equal to 0.20%  of the Fund's  average daily  net
  assets  is characterized as a  service fee within the  meaning of the National
  Association of Securities Dealers, Inc. ("NASD") guidelines (see "Purchase  of
  Fund Shares").
 
<TABLE>
<CAPTION>
EXAMPLE                                   1 YEAR   3 YEARS   5 YEARS   10 YEARS
- ----------------------------------------  ------   -------   -------   --------
<S>                                       <C>      <C>       <C>       <C>
You  would pay the following expenses on
 a $1,000  investment, assuming  (1)  5%
 annual return and (2) redemption at the
 end of each time period:...............   $66      $ 81      $108       $192
You  would pay the following expenses on
 the  same   investment,   assuming   no
 redemption:............................   $16      $ 51      $ 88       $192
</TABLE>
 
THE  ABOVE EXAMPLE SHOULD NOT  BE CONSIDERED A REPRESENTATION  OF PAST OR FUTURE
EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE FUND MAY BE GREATER OR LESS THAN
THOSE SHOWN.
 
The purpose of this table is to assist the investor in understanding the various
costs and  expenses  that  an  investor  in  the  Fund  will  bear  directly  or
indirectly.  For a  more complete description  of these costs  and expenses, see
"The Fund  and Its  Management,"  "Plan of  Distribution" and  "Redemptions  and
Repurchases."
 
Long-term   shareholders  of  the  Fund  may  pay  more  in  sales  charges  and
distribution fees than the  economic equivalent of  the maximum front-end  sales
charges permitted by the NASD.
 
                                                                               3
<PAGE>
FINANCIAL HIGHLIGHTS
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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,  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
                                                                                                                  PERIOD
                                                                                                                  MAY 3,
                                                                                                                   1989*
                                                           FOR THE YEAR ENDED AUGUST 31                           THROUGH
                                    ---------------------------------------------------------------------------   AUGUST
                                      1996       1995       1994       1993       1992       1991       1990     31, 1989
                                    ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                 <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of
 period............................ $   9.69   $   9.51   $  10.26   $  10.05   $   9.59   $   9.42   $   9.98   $  10.00
                                    ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Net investment income............     0.55       0.59       0.58       0.62       0.70       0.79       0.86       0.28
  Net realized and unrealized gain
   (loss)..........................    (0.30)      0.19      (0.73)      0.20       0.46       0.17      (0.55)     (0.02)
                                    ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Total from investment
   operations......................     0.25       0.78      (0.15)      0.82       1.16       0.96       0.31       0.26
                                    ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Less dividends and distributions
   from:
    Net investment income..........    (0.55)     (0.59)     (0.56)     (0.61)     (0.70)     (0.79)     (0.86)     (0.28)
    Net realized gain..............      -0-      (0.01)     (0.04)       -0-        -0-        -0-      (0.01)       -0-
                                    ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Total dividends and
   distributions...................    (0.55)     (0.60)     (0.60)     (0.61)     (0.70)     (0.79)     (0.87)     (0.28)
                                    ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Net asset value, end of period... $   9.39   $   9.69   $   9.51   $  10.26   $  10.05   $   9.59   $   9.42   $   9.98
                                    ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                    ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
TOTAL INVESTMENT RETURN+...........     2.58%      8.56%    (1.50)%      8.43%     12.58%     10.78%      3.22%      2.57%(1)
RATIOS TO AVERAGE NET ASSETS:
  Expenses.........................     1.62%      1.63%      1.63%      1.62%      1.69%      1.69%      1.75%      1.42%(2)(3)
  Net investment income............     5.69%      6.23%      5.80%      6.12%      7.11%      8.49%      8.78%      8.18%(2)(3)
SUPPLEMENTAL DATA:
  Net assets, end of period, in
   thousands.......................  $208,911   $232,752   $245,750   $254,431   $187,285   $115,204   $114,086    $69,946
  Portfolio turnover rate..........      115%       114%       122%       132%        93%       150%       135%        30%(1)
</TABLE>
 
- ------------------------
 *  COMMENCEMENT OF OPERATIONS.
 
 +  DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
    ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
 
(1) NOT ANNUALIZED.
 
(2) ANNUALIZED.
 
(3) IF THE FUND HAD BORNE ALL THE EXPENSES THAT WERE ASSUMED OR WAIVED BY THE
    INVESTMENT MANAGER, THE ABOVE EXPENSE AND NET INVESTMENT INCOME RATIOS WOULD
    HAVE BEEN 2.15% AND 7.44%, RESPECTIVELY.
 
4
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
Dean  Witter  Intermediate  Income  Securities  (the  "Fund")  is  an  open-end,
diversified  management  investment company.  The Fund  is a  trust of  the type
commonly known as a "Massachusetts business  trust" and was organized under  the
laws of the Commonwealth of Massachusetts on September 1, 1988.
 
    Dean Witter InterCapital, Inc. ("InterCapital" or the "Investment Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
Investment  Manager.  The Investment  Manager, which  was incorporated  in July,
1992, is a wholly-owned  subsidiary of Dean Witter,  Discover & Co. ("DWDC"),  a
balanced  financial services organization providing  a broad range of nationally
marketed credit and investment products.
 
    InterCapital and its wholly-owned  subsidiary, Dean Witter Services  Company
Inc.,   serve  in  various  investment   management,  advisory,  management  and
administrative capacities  to  100 investment  companies,  thirty of  which  are
listed  on the  New York Stock  Exchange, with combined  assets of approximately
$83.6 billion  at  September  30,  1996. The  Investment  Manager  also  manages
portfolios of pension plans, other institutions and individuals which aggregated
approximately $2.9 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
provide  the  aforementioned administrative  services  to 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  by applying the
annual rate of 0.60% to the Fund's  daily net assets up to $500 million,  scaled
down  at various levels to 0.30% on assets  over $1 billion. For the fiscal year
ended August 31,  1996, the Fund  accrued total compensation  to the  Investment
Manager amounting to 0.60% of the Fund's average daily net assets and the Fund's
total expenses amounted to 1.62% of the Fund's average daily net assets.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The  investment objective  of the  Fund is  high current  income consistent with
safety of principal. This investment objective  is a fundamental policy and  may
not  be changed without approval  of the Fund's shareholders.  The Fund seeks to
achieve its  objective  by  investing  at  least 65%  of  its  total  assets  in
intermediate  term,  investment  grade fixed-income  securities.  The  Fund will
maintain an average weighted maturity of  approximately seven years or less  and
may  not  invest in  securities with  remaining  maturities greater  than twelve
years. Under normal conditions, the Fund's average weighted maturity will not be
less than three  years. (Under the  current interpretation by  the staff of  the
Securities  and  Exchange Commission,  an intermediate  bond  fund must  have an
average weighted maturity between three and ten years.)
 
    Under normal circumstances, the Fund will invest primarily in corporate debt
securities and preferred stock of investment grade, which consists of securities
which are rated  at the  time of  purchase Baa  or better  by Moody's  Investors
Service,  Inc. ("Moody's")  or BBB  or better  by Standard  & Poor's Corporation
("Standard & Poor's"),  or which,  if unrated, are  deemed to  be of  comparable
quality  by the  Fund's Trustees. Fixed-income  securities rated  Baa by Moody's
have speculative characteristics. (A more  detailed description of bond  ratings
is  contained in the  Appendix to the Statement  of Additional Information.) The
Fund may also purchase U.S.  Government securities (securities guaranteed as  to
principal   and   interest   by   the  United   States   or   its   agencies  or
instrumentalities) and investment grade securities, denominated in U.S. Dollars,
issued by foreign governments  or issuers. U.S.  Government securities in  which
the   Fund  may  invest  include  zero  coupon  securities  and  mortgage-backed
securities, such  as  securities  issued by  the  Government  National  Mortgage
Association, the Federal National Mortgage Association and the Federal Home Loan
Mortgage Corporation. There can be no assurance that the investment objective of
the Fund will be achieved.
 
    The  Investment  Manager believes  that  the Fund's  policies  of purchasing
intermediate term securities will reduce the volatility of the Fund's net  asset
value  over  the  long  term. Although  the  values  of  fixed-income securities
generally increase  during  periods of  declining  interest rates  and  decrease
during  periods of increasing  interest rates, the  extent of these fluctuations
has historically generally  been smaller for  intermediate term securities  than
for  securities  with  longer  maturities. Conversely,  the  yield  available on
intermediate term  securities  has  also  historically  been  lower  than  those
available from long term securities.
 
    Investment  by the Fund  in U.S. Dollar  denominated fixed-income securities
issued by foreign governments and
 
                                                                               5
<PAGE>
other foreign issuers may involve certain risks not associated with U.S.  issued
securities.  Those risks  include the political  or economic  instability of the
issuer or of the  country of issue, the  difficulty of predicting  international
trade  patterns  and  the possibility  of  imposition of  exchange  controls. In
addition, there  may be  less  publicly available  information about  a  foreign
company  than  about a  domestic  company. A  more  detailed description  of the
general risks of  foreign issuers is  contained in the  Statement of  Additional
Information.  The  Fund believes  that  those risks  are  substantially lessened
because the  foreign securities  in which  the Fund  may invest  are  investment
grade.
 
    While  the  Fund  will  invest primarily  in  investment  grade fixed-income
securities, under ordinary  circumstances it also  may invest up  to 35% of  its
total  assets in money  market instruments, repurchase  agreements, as discussed
below, and up  to 5% of  the Fund's net  assets may be  invested in lower  rated
fixed-income securities.
 
    Lower  rated fixed-income securities, which are those  rated from Ba to C or
BB to C  by Moody's or  Standard &  Poor's, respectively, are  considered to  be
speculative  investments. Such  lower rated  securities, while  producing higher
yield than investment grade securities, are subject to credit risk to a  greater
extent  than investment  grade securities.  The Fund  does not  have any minimum
quality rating standard with respect to the portion (up to 5%) of its net assets
which may be invested in lower rated securities. See the Statement of Additional
Information for a description of the special risks and characteristics of  lower
rated fixed-income securities.
 
    There may be periods during which, in the opinion of the Investment Manager,
market  conditions warrant  reduction of  some or  all of  the Fund's securities
holdings. During  such  periods, the  Fund  may adopt  a  temporary  "defensive"
posture  in which greater than  35% of its total assets  are invested in cash or
money market instruments. Money market instruments in which the Fund may  invest
are  securities issued  or guaranteed  by the  U.S. Government  (Treasury bills,
notes and bonds, including zero coupon securities); bank obligations; Eurodollar
certificates of  deposit; obligations  of  savings institutions;  fully  insured
certificates  of  deposit; and  commercial paper  rated  within the  two highest
grades by Moody's or Standard & Poor's or, if not rated, are issued by a company
having an outstanding debt issue rated at least AA by Standard & Poor's or Aa by
Moody's.
 
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.
 
REPURCHASE AGREEMENTS.  The Fund may enter into repurchase agreements, which may
be  viewed as a type of secured lending by the Fund, and which 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 at a specified price and at
a fixed time in the  future, usually not more than  seven days from the date  of
purchase.  While repurchase agreements involve certain risks not associated with
direct investments  in  debt  securities,  including the  risks  of  default  or
bankruptcy  of the  selling financial  institution, the  Fund follows procedures
designed to minimize those risks. These procedures include effecting  repurchase
transactions  only with  large, well-capitalized and  well established financial
institutions and maintaining adequate collateralization.
 
REVERSE REPURCHASE  AGREEMENTS.    The  Fund may  also  use  reverse  repurchase
agreements  for purposes  of meeting  redemptions or  as part  of its investment
strategy. Reverse repurchase agreements involve  sales by the Fund of  portfolio
assets  concurrently with an agreement by the Fund to repurchase the same assets
at a later date at a fixed price. Generally, the effect of such a transaction is
that the Fund  can recover all  or most of  the cash invested  in the  portfolio
securities  involved during the term of  the reverse repurchase agreement, while
it will be  able to  keep the interest  income associated  with those  portfolio
securities.  Such transactions are only advantageous if the interest cost to the
Fund of the reverse  repurchase transaction is less  than the cost of  obtaining
the  cash otherwise. Opportunities  to achieve this advantage  may not always be
available, and the  Fund intends to  use the reverse  repurchase technique  only
when  it will be to its advantage to do so. The Fund will establish a segregated
account with its custodian bank in which it will maintain cash, U.S.  Government
securities   or  other  liquid  portfolio  securities  equal  in  value  to  its
obligations in  respect of  reverse  repurchase agreements.  Reverse  repurchase
agreements  are considered borrowings by the Fund. The use of borrowed funds for
other than
 
6
<PAGE>
emergency purposes  constitutes leveraging,  which is  a speculative  technique.
Reverse repurchase agreements may not exceed 10% of the Fund's total assets.
 
WHEN-ISSUED  AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  From time
to time, in the ordinary course of business, the Fund may purchase securities on
a when-issued or delayed delivery basis or may purchase or sell securities on  a
forward  commitment basis. When  such transactions are  negotiated, the price is
fixed at the time of the commitment,  but delivery and payment can take place  a
month or more after the date of the commitment. There is no overall limit on the
percentage  of  the Fund's  assets which  may  be committed  to the  purchase of
securities on a when-issued,  delayed delivery or  forward commitment basis.  An
increase  in the percentage  of the Fund's  assets committed to  the purchase of
securities on a when-issued,  delayed delivery or  forward commitment basis  may
increase the volatility of the Fund's net asset value.
 
WHEN, AS AND IF ISSUED SECURITIES.  The Fund may purchase securities on a "when,
as  and if issued" basis  under which the issuance  of the security depends upon
the occurrence of a  subsequent event, such as  approval of a merger,  corporate
reorganization, leveraged buyout or debt restructuring. If the anticipated event
does  not occur and  the securities are not  issued, the Fund  will have lost an
investment opportunity.  There is  no overall  limit on  the percentage  of  the
Fund's  assets which may be committed to  the purchase of securities on a "when,
as and if  issued" basis. An  increase in  the percentage of  the Fund's  assets
committed  to the purchase of securities on a "when, as and if issued" basis may
increase the volatility of its net asset value.
 
PRIVATE PLACEMENTS.   The  Fund may  invest  up to  5% of  its total  assets  in
securities  which are  subject to restrictions  on resale because  they have not
been registered under the  Securities Act of 1933,  as amended (the  "Securities
Act"),  or which are otherwise not  readily marketable. (Securities eligible for
resale pursuant to  Rule 144A  under the Securities  Act, and  determined to  be
liquid  pursuant to the procedures discussed in the following paragraph, are not
subject to the foregoing restriction.)  These securities are generally  referred
to  as private placements or restricted securities. Limitations on the resale of
such securities  may have  an adverse  effect on  their marketability,  and  may
prevent  the Fund from disposing of them promptly at reasonable prices. The Fund
may have to bear the expense of  registering such securities for resale and  the
risk of substantial delays in effecting such registration.
 
    The  Securities  and Exchange  Commission has  adopted  Rule 144A  under the
Securities Act,  which  permits  the  Fund  to  sell  restricted  securities  to
qualified  institutional  buyers  without  limitation.  The  Investment Manager,
pursuant to  procedures  adopted  by the  Trustees  of  the Fund,  will  make  a
determination  as to the liquidity of  each restricted security purchased by the
Fund. If a restricted security is determined to be "liquid," such security  will
not  be included within the category  "illiquid securities," which is limited by
the Fund's investment restrictions to 10% of the Fund's total assets.  Investing
in  Rule 144A securities could  have the effect of  increasing the level of Fund
illiquidity to the extent the Fund, at a particular point in time, may be unable
to find qualified institutional buyers interested in purchasing such securities.
 
LENDING  OF  PORTFOLIO  SECURITIES.    Consistent  with  applicable   regulatory
requirements, the Fund may lend its portfolio securities to brokers, dealers and
other  financial institutions, provided that such loans are callable at any time
by the Fund (subject to certain notice provisions described in the Statement  of
Additional  Information),  and  are  at  all  times  secured  by  cash  or  cash
equivalents, which are maintained in a segregated account pursuant to applicable
regulations and that are at least  equal to the market value, determined  daily,
of the loaned securities.
 
PORTFOLIO MANAGEMENT
 
The  Fund's portfolio is actively managed by  its 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; the views of Trustees of the Fund and  others
regarding  economic developments  and interest  rate trends;  and the Investment
Manager's own analysis  of factors it  deems relevant. The  Fund's portfolio  is
managed within InterCapital's Taxable Group, which manages twenty-five funds and
fund  portfolios, with approximately $12.9 billion in assets as of September 30,
1996. Rochelle G. Siegel, Senior Vice President of InterCapital and a member  of
InterCapital's  Taxable Group, has been the  primary portfolio manager since the
Fund's inception and has  been a portfolio manager  at InterCapital since  July,
1985.
 
    Orders for transactions in portfolio securities are placed for the Fund with
a  number of brokers  and dealers, including Dean  Witter Reynolds Inc. ("DWR").
Pursuant to an  order of the  Securities and Exchange  Commission, the Fund  may
effect  principal transactions in  certain money market  instruments with DWR, a
broker-dealer affiliate  of  InterCapital.  In  addition,  the  Fund  may  incur
brokerage   commissions  on  transactions  conducted  through  DWR.  It  is  not
anticipated that  the portfolio  trading  will result  in the  Fund's  portfolio
turnover  rate  exceeding  200%.  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.
 
                                                                               7
<PAGE>
RISK CONSIDERATIONS
- --------------------------------------------------------------------------------
 
An  increase in  prevailing levels of  interest rates will  generally reduce the
value of  securities in  the Fund's  portfolio, while  a decline  in rates  will
generally  increase the value of these securities. As a result, the fluctuations
or changes in interest rates will cause  the Fund's net asset value to rise  and
fall,  in an inverse relationship; however, the income received by the Fund from
its portfolio securities will not be affected. Because yields on debt securities
available for purchase by a Fund vary over time, no specific yield on shares  of
the  Fund can  be assured.  In addition,  if the  bonds in  the Fund's portfolio
contain call, prepayment or redemption provisions, during a period of  declining
interest  rates, these securities are  likely to be redeemed,  and the Fund will
probably be unable to replace them with securities having an equal yield.
 
    For additional risk  disclosure, please refer  to the "Investment  Objective
and  Policies" section  of the Prospectus  and to the  "Investment Practices and
Policies" section in the Statement of Additional Information.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
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 limitations:  (i) all
percentage limitations apply immediately after a purchase or initial investment,
and (ii)  any subsequent  change  in any  applicable percentage  resulting  from
market  fluctuations or other  changes in total  or net assets  does not require
elimination of any security from the portfolio.
 
    The Fund may not:
 
        1. 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  voting securities or any
    class of securities of any one issuer.
 
        3. Invest 25% or more 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 or  its agencies  or
    instrumentalities.
 
        4.  Invest more  than 10% of  its total assets  in "illiquid securities"
    (securities for  which  market quotations  are  not readily  available)  and
    repurchase agreements which have a maturity of longer than seven days.
 
        5. Invest more than 5% of the value of its total assets in 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  issued  or  guaranteed  by  the  United  States  Government, its
    agencies or instrumentalities.
 
        6. Borrow  money,  except  that  the Fund  may  borrow  from  banks  for
    temporary or emergency purposes in an amount up to 5% (taken at the lower of
    cost  or  current  value) of  its  total  assets (not  including  the amount
    borrowed), and may enter into reverse repurchase agreements in an amount not
    exceeding 10% of the Fund's total assets.
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
The Fund  offers its  shares  for sale  to the  public  on a  continuous  basis.
Pursuant   to  a  Distribution  Agreement  between  the  Fund  and  Dean  Witter
Distributors Inc. (the "Distributor"), an  affiliate of the Investment  Manager,
shares  of the Fund  are distributed by  the Distributor and  offered by DWR and
other dealers  who  have  entered  into  selected  dealer  agreements  with  the
Distributor  ("Selected Broker-Dealers"). The principal  executive office of the
Distributor is located at Two World Trade Center, New York, New York 10048.
 
    The minimum initial purchase is $1,000. Minimum subsequent purchases of $100
or more may  be made by  sending a  check, payable to  Dean Witter  Intermediate
Income  Securities, directly to Dean Witter Trust Company (the "Transfer Agent")
at P.O. Box 1040, Jersey City, NJ 07303 or by contacting an account executive of
DWR or another Selected Broker-Dealer. The minimum initial purchase in the  case
of   investments  through  EasyInvest-SM-,  an   automatic  purchase  plan  (see
"Shareholder Services")  , is  $100,  provided that  the schedule  of  automatic
investments  will result  in investments  totalling at  least $1,000  within the
first twelve months. In the case  of investments pursuant to Systematic  Payroll
Deduction  Plans  (including  Individual  Retirement Plans),  the  Fund,  in its
discretion, may accept investments without  regard to any minimum amounts  which
would  otherwise be required if  the Fund has reason  to believe that additional
investments will increase the investment in all accounts under such Plans to  at
least
 
8
<PAGE>
$1,000. Certificates for shares purchased will not be issued unless a request is
made  by the shareholder  in writing to  the Transfer Agent.  The offering price
will be the net asset  value per share next  determined following receipt of  an
order (see "Determination of Net Asset Value").
 
    Shares  of  the Fund  are sold  through  the Distributor  on a  normal three
business day settlement basis; that is, payment is due on the third business day
(settlement date) after the order is placed with the Distributor. Shares of  the
Fund  purchased through the  Distributor are entitled  to dividends beginning on
the next business day  following settlement date. Since  DWR and other  Selected
Broker-Dealers  forward investors' funds  on settlement date,  they will benefit
from the temporary use of the funds where payment is made prior thereto.  Shares
purchased  through the Transfer Agent are entitled to dividends beginning on the
next business day following receipt of  an order. As noted above, orders  placed
directly  with the Transfer Agent must be accompanied by payment. Investors will
be entitled to receive capital gains distributions if their order is received by
the  close  of  business  on  the  day  prior  to  the  record  date  for   such
distributions.  While  no  sales  charge  is  imposed  at  the  time  shares are
purchased, a contingent  deferred sales  charge may be  imposed at  the time  of
redemption  (see "Redemptions and Repurchases"). Sales personnel are compensated
for selling shares  of the Fund  at the time  of their sale  by the  Distributor
and/or Selected Broker-Dealer. In addition, some sales personnel of the Selected
Broker-Dealer  will receive  various types  of non-cash  compensation as special
sales incentives, including  trips, educational  and/ or  business seminars  and
merchandise.  The  Fund and  the  Distributor reserve  the  right to  reject any
purchase orders.
 
PLAN OF DISTRIBUTION
 
The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the Act
(the "Plan"), under which the Fund pays the Distributor a fee, which is  accrued
daily  and payable monthly, at an annual rate of 0.85% of the lesser of: (a) the
average daily aggregate gross sales of the Fund's shares since the inception  of
the   Fund  (not   including  reinvestments   of  dividends   or  capital  gains
distributions), less the average daily aggregate  net asset value of the  Fund's
shares  redeemed since  the Fund's  inception upon  which a  contingent deferred
sales charge has been  imposed or waived;  or (b) the  Fund's average daily  net
assets. This fee is treated by the Fund as an expense in the year it is accrued.
Amounts  paid under the Plan  are paid to the  Distributor for services provided
and the expenses borne by the Distributor and others in the distribution of  the
Fund's  shares, including  the payment  of commissions  for sales  of the Fund's
shares and incentive compensation  to and expenses  of DWR'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  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 incurred by the Distributor.
 
    For  the fiscal year ended August 31,  1996, the Fund accrued payments under
the Plan amounting to $1,894,592, which amount  is equal to 0.85% of the  Fund's
average  daily net assets for the fiscal  year. These payments accrued under the
Plan were calculated pursuant  to clause (b) of  the compensation formula  under
the  Plan. Of  the amount accrued  under the  Plan, 0.20% of  the Fund's average
daily net assets is characterized  as a service fee  within the meaning of  NASD
guidelines.  The service fee is  a payment made for  personal service and/or the
maintenance of shareholder accounts.
 
    At any given time, the expenses in distributing shares of the Fund may be in
excess of the total of (i) the payments  made by the Fund pursuant to the  Plan,
and  (ii) the  proceeds of contingent  deferred sales charges  paid by investors
upon the  redemption of  shares  (see "Redemptions  and  Repurchases--Contingent
Deferred  Sales Charge"). For example, if the Distributor incurred $1 million in
expenses in distributing shares  of the Fund and  $750,000 had been received  by
the  Distributor 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 $6,167,490 at
August 31, 1996, which was equal to 2.95% of the Fund's net assets on such date.
 
    Because there  is no  requirement under  the Plan  that the  Distributor  be
reimbursed  for all 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
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.
 
DETERMINATION OF NET ASSET VALUE
 
The net asset value per share of the Fund is determined once daily at 4:00 p.m.,
New York time (or, on days when the New York Stock Exchange closes prior to 4:00
p.m.,  at such earlier  time), on each day  that the New  York Stock Exchange is
open by taking the value of all assets of the
 
                                                                               9
<PAGE>
Fund, subtracting  all  its  liabilities,  dividing  by  the  number  of  shares
outstanding  and adjusting to  the nearest cent.  The net asset  value per share
will not be determined on Good Friday and on such other federal and  non-federal
holidays as are observed by the New York Stock Exchange.
 
    In  the calculation of the  Fund's net asset value:  (1) an equity portfolio
security listed or traded on  the New York or  American Stock Exchange or  other
domestic  or foreign exchange or  quoted by NASDAQ is  valued at its latest sale
price on that exchange or quotation service prior to the time assets are valued;
if there were no sales that day, the security is valued at the latest bid  price
(in  cases where a security is traded on more than one exchange, the security is
valued on the exchange designated as  the primary market pursuant to  procedures
adopted   by  the  Trustees);  and  (2)   all  portfolio  securities  for  which
over-the-counter market  quotations  are readily  available  are valued  at  the
latest  bid price. When  market quotations are  not readily available, including
circumstances under which it is determined  by the Investment Manager that  sale
and  bid  prices are  not  reflective of  a  security's market  value, portfolio
securities are valued  at their  fair value as  determined in  good faith  under
procedures  established by  and under  the general  supervision of  the Board of
Trustees.
 
    Certain of  the Fund's  portfolio securities  may be  valued by  an  outside
pricing service approved by the Fund's Trustees. The pricing service may utilize
a  matrix  system incorporating  security quality,  maturity  and coupon  as the
evaluation model parameters, and/or research evaluations by its staff, including
review of broker-dealer market price quotations, in determining what it believes
is the  fair  valuation of  the  portfolio  securities valued  by  such  pricing
service.  (See "Determination of Net Asset Value" in the Statement of Additional
Information.)
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
AUTOMATIC INVESTMENT OF DIVIDENDS AND  DISTRIBUTIONS.  All income dividends  and
capital gains distributions are automatically paid in full and fractional shares
of the Fund, (or, if specified by the shareholder, any other open-end investment
company for which InterCapital serves as investment manager ([collectively, with
the  Fund, the "Dean Witter Funds"]),  unless the shareholder requests that they
be paid in  cash. Shares  so acquired  are not subject  to the  imposition of  a
contingent  deferred sales  charge upon  their redemption  (see "Redemptions and
Repurchases"). Such dividends and distributions will  be paid, at the net  asset
value  per  share, in  shares of  the Fund  (or  in cash  if the  shareholder so
requests) on the  monthly payment date,  which will  be no later  than the  last
business  day of the  month for which  the dividend or  distribution is payable.
Processing of dividend checks begins  immediately following the monthly  payment
date. Shareholders who have requested to receive dividends in cash will normally
receive  their monthly dividend check during the first ten days of the following
month.
 
EASYINVEST-SM-.  Shareholders may subscribe to EasyInvest, an automatic purchase
plan which  provides  for any  amount  from $100  to  $5,000 to  be  transferred
automatically  from a checking or savings account, on a semi-monthly, monthly or
quarterly basis, to the  Fund's Transfer Agent for  investment in shares of  the
Fund    (see    "Purchases    of    Fund    Shares"    and    "Redemptions   and
Repurchases--Involuntary Redemption").
 
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 at  the net asset value per share  next
determined  after receipt by the  Transfer Agent, by returning  the check or the
proceeds to the Transfer Agent within thirty days after the payment date. Shares
so acquired are  not subject to  the imposition of  a contingent deferred  sales
charge upon their redemption (see "Redemptions and Repurchases").
 
SYSTEMATIC  WITHDRAWAL  PLAN.   A  systematic withdrawal  plan  (the "Withdrawal
Plan") is available  for shareholders  who own or  purchase shares  of the  Fund
having  a minimum value of $10,000 based  upon the then current net asset value.
The Withdrawal Plan provides  for monthly or  quarterly (March, June,  September
and  December) checks in  any dollar amount, not  less than $25  or in any whole
percentage of  the  account balance,  on  an annualized  basis.  Any  applicable
contingent  deferred sales charge  will be imposed on  shares redeemed under the
Withdrawal Plan  (See "Redemptions  and Repurchases--Contingent  Deferred  Sales
Charge").  Therefore, any shareholder participating  in the Withdrawal Plan will
have sufficient shares  redeemed from his  or her account  so that the  proceeds
(net of any applicable contingent deferred sales charge) to the shareholder will
be the designated monthly or quarterly amount.
 
    Shareholders  should  contact  their  DWR  or  other  Selected Broker-Dealer
account executive or the Transfer Agent for further information about any of the
above services.
 
TAX-SHELTERED RETIREMENT  PLANS.   Retirement  plans are  available for  use  by
corporations,  the  self-employed, eligible  Individual Retirement  Accounts and
Custodial Accounts  under  Section  403(b)(7)  of  the  Internal  Revenue  Code.
Adoption of such plans should be on advice of legal counsel or tax adviser.
 
    For  further information  regarding plan administration,  custodial fees and
other  details,  investors   should  contact   their  DWR   or  other   Selected
Broker-Dealer account executive or the Transfer Agent.
 
10
<PAGE>
EXCHANGE PRIVILEGE
 
The  Fund makes available  to its shareholders  an "Exchange Privilege" allowing
the exchange of shares of  the Fund for shares of  other Dean Witter Funds  sold
with  a  contingent deferred  sales charge  ("CDSC funds"),  for shares  of Dean
Witter Short-Term U.S. Treasury Trust, Dean Witter Limited Term Municipal Trust,
Dean Witter Short-Term Bond Fund, Dean Witter Balanced Growth Fund, Dean  Witter
Balanced  Income Fund and Dean Witter  Intermediate Term U.S. Treasury Trust and
for shares of five Dean Witter Funds which are money market funds (the foregoing
eleven non-CDSC funds are hereinafter  collectively referred to in this  section
as  the "Exchange Funds").  Exchanges may be  made after the  shares of the Fund
acquired by purchase (not by exchange  or dividend reinvestment) have been  held
for  thirty days. There is no waiting period for exchanges of shares acquired by
exchange or dividend reinvestment.
 
    An exchange to another CDSC fund or to 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 CDSC funds can be effected on the same  basis.
No  contingent deferred  sales charge  ("CDSC") is  imposed at  the time  of any
exchange, although any applicable CDSC will be imposed upon ultimate redemption.
Shares of the Fund acquired in exchange for shares of another CDSC fund having a
different CDSC schedule  than that  of this  Fund will  be subject  to the  CDSC
schedule  of this  Fund, even if  such shares are  subsequently re-exchanged for
shares of the  CDSC fund  originally purchased. During  the period  of time  the
shareholder  remains in the Exchange  Fund (calculated from the  last day of the
month in which the Exchange Fund shares were acquired), the holding period  (for
the  purpose of determining the rate of the CDSC) is frozen. If those shares are
subsequently  reexchanged  for  shares  of  a  CDSC  fund,  the  holding  period
previously  frozen when the first  exchange was made resumes  on the last day of
the month in which shares of a CDSC fund are reacquired. Thus, the CDSC is based
upon the time (calculated as described above) the shareholder was invested in  a
CDSC fund (see "Redemptions and Repurchases--Contingent Deferred Sales Charge").
However, in the case of shares exchanged into an Exchange Fund on or after April
23,  1990, upon a redemption of shares which  results in a CDSC being imposed, a
credit (not to exceed the amount of the  CDSC) will be given in an amount  equal
to  the Exchange  Fund 12b-1  distribution fees incurred  on or  after that date
which are attributable to those  shares. (Exchange Fund 12b-1 distribution  fees
are described in the prospectuses for those funds.)
 
    In  addition, shares of the  Fund may be acquired  in exchange for shares of
Dean Witter Funds sold  with a front-end sales  charge ("front-end sales  charge
funds"),  but shares  of the  Fund, however acquired,  may not  be exchanged for
shares of  front-end sales  charge funds.  Shares  of a  CDSC fund  acquired  in
exchange  for shares of a front-end sales charge fund (or in exchange for shares
of other Dean Witter  Funds for which  shares of a  front-end sales charge  fund
have been exchanged) are not subject to any CDSC upon their redemption.
 
    Purchases  and  exchanges should  be made  for  investment purposes  only. A
pattern of frequent  exchanges may  be deemed by  the Investment  Manager to  be
abusive and contrary to the best interests of the Fund's other shareholders and,
at  the Investment Manager's discretion, may be limited by the Fund's refusal to
accept additional purchases  and/or exchanges  from the  investor. Although  the
Fund  does not  have any  specific definition of  what constitutes  a pattern of
frequent exchanges,  and  will  consider all  relevant  factors  in  determining
whether  a particular situation is abusive and contrary to the best interests of
the Fund and its other shareholders, investors should be aware that the Fund and
each of the other Dean Witter Funds  may in their discretion limit or  otherwise
restrict  the number of  times this Exchange  Privilege may be  exercised by any
investor. Any such restriction will be made  by the Fund on a prospective  basis
only,  upon notice  of the  shareholder not later  than ten  days following such
shareholder's  most  recent  exchange.  Also,  the  Exchange  Privilege  may  be
terminated  or revised at  any time by the  Fund and/or any  of such Dean Witter
Funds for which shares of the Fund have been exchanged, upon such notice as  may
be  required by applicable regulatory  agencies. Shareholders maintaining margin
accounts with  DWR  or another  Selected  Broker-Dealer are  referred  to  their
account  executive  regarding restrictions  on exchange  of  shares of  the Fund
pledged in the margin account.
 
    The current prospectus for each  fund describes its investment  objective(s)
and  policies, and  shareholders should obtain  a copy and  examine it carefully
before investing. Exchanges  are subject to  the minimum investment  requirement
and  any other conditions imposed by each  fund. An exchange will be treated for
federal income tax purposes the same as a repurchase or redemption of shares, on
which the shareholder may realize a  capital gain or loss. However, the  ability
to deduct capital losses on an exchange may be limited in situations where there
is  an exchange of shares within ninety days after the shares are purchased. The
Exchange Privilege is only available in states where an exchange may legally  be
made.
 
    If DWR or another Selected Broker-Dealer is the current dealer of record and
its  account  numbers  are part  of  the account  information,  shareholders may
initiate an exchange of shares of the Fund for shares of any of the Dean  Witter
Funds  (for which the Exchange Privilege is available) pursuant to this Exchange
Privilege   by    contacting    their    account    executive    (no    Exchange
 
                                                                              11
<PAGE>
Privilege  Authorization  Form  is  required).  Other  shareholders  (and  those
shareholders who are  clients of DWR  or other Selected  Broker-Dealers but  who
wish  to make exchanges  directly by writing or  telephoning the Transfer Agent)
must  complete  and  forward  to  the  Transfer  Agent  an  Exchange   Privilege
Authorization  Form, copies of which may be obtained from the Transfer Agent, to
initiate an exchange. If the Authorization  Form is used, exchanges may be  made
in  writing or by  contacting the Transfer Agent  at (800) 869-NEWS (toll-free).
The Fund will employ reasonable procedures to confirm that exchange instructions
communicated over  the  telephone  are  genuine.  Such  procedures  may  include
requiring  various  forms  of  personal  identification  such  as  name, mailing
address, social security  or other tax  identification number and  DWR or  other
Selected  Broker-Dealer account number (if any). Telephone instructions may also
be recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent between 9:00 a.m. and  4:00 p.m., New York time,  on any day the New  York
Stock  Exchange is  open. Any  shareholder wishing to  make an  exchange who has
previously filed an Exchange Privilege Authorization  Form and who is unable  to
reach  the Fund  by telephone should  contact his  or her DWR  or other Selected
Broker-Dealer account  executive, if  appropriate, or  make a  written  exchange
request.  Shareholders are  advised that during  periods of  drastic economic or
market changes, it  is possible that  the telephone exchange  procedures may  be
difficult  to implement, although this has not been the experience 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 the Fund can be redeemed for cash at any time at the  net
asset  value per share next determined; however, such redemption proceeds may be
reduced by the amount of any  applicable contingent deferred sales charges  (see
below).  If  shares  are  held  in  a  shareholder's  account  without  a  share
certificate, a written request  for redemption to the  Fund's Transfer Agent  at
P.O. Box 983, Jersey City, NJ 07303 is required. If certificates are held by the
shareholder,  the shares may be redeemed by surrendering the certificates with a
written request for redemption along with any additional documentation  required
by the Transfer Agent.
 
CONTINGENT  DEFERRED SALES CHARGE.   Shares of  the Fund which  are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were purchased)  will not be subject  to any charge upon  redemption.
Shares  redeemed sooner than six years  after purchase will, however, be subject
to a charge upon redemption. This charge is called a "contingent deferred  sales
charge"  ("CDSC"), and it  will be a  percentage of the  dollar amount of shares
redeemed and will be assessed  on an amount equal to  the lesser of the  current
market  value  or  the cost  of  the shares  being  redeemed. The  size  of this
percentage will depend upon how long the shares have been held, as set forth  in
the table below:
 
<TABLE>
<CAPTION>
                                               CONTINGENT
                                                DEFERRED
               YEAR SINCE                     SALES CHARGE
                PURCHASE                   AS A PERCENTAGE OF
              PAYMENT MADE                  AMOUNT REDEEMED
- -----------------------------------------  ------------------
<S>                                        <C>
First....................................         5.0%
Second...................................         4.0%
Third....................................         3.0%
Fourth...................................         2.0%
Fifth....................................         2.0%
Sixth....................................         1.0%
Seventh and thereafter...................         None
</TABLE>
 
    A  CDSC will not be imposed on:  (i) any amount which represents an increase
in value of shares 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 Dean Witter Funds sold  with a front-end sales charge or of  other
Dean Witter Funds acquired in exchange for such shares. Moreover, in determining
whether  a CDSC is applicable it will  be assumed that amounts described in (i),
(ii) and (iii) above (in  that order) are redeemed  first. In addition, no  CDSC
will  be imposed on redemptions  of shares which were  purchased by the employee
benefit plans  established  by  DWR  and  SPS  Transaction  Services,  Inc.  (an
affiliate  of DWR) for their employees as  qualified under Section 401(k) of the
Internal Revenue Code.  The Distributor  has informed  the Fund  that the  total
amount  of  CDSC paid  to  it for  the  fiscal year  ended  August 31,  1996 was
$364,492.
 
    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;
 
12
<PAGE>
    (2)    redemptions  in  connection   with  the  following  retirement   plan
distributions:   (A) lump-sum or other  distributions from a qualified corporate
or self-employed retirement plan following retirement (or, in the case of a "key
employee"   of   a   "top   heavy"    plan,   following   attainment   of    age
59  1/2);  (B) distributions  from an IRA or  403(b) Custodial Account following
attainment of age 59 1/2; or    (C) a tax-free return of an excess  contribution
to an IRA; and
 
    (3)   all redemptions of  shares held for the benefit  of a participant in a
corporate or self-employed retirement plan qualified under Section 401(k) of the
Internal  Revenue  Code  which  offers  investment  companies  managed  by   the
Investment  Manager or  its subsidiary,  Dean Witter  Services Company  Inc., as
self-directed investment alternatives and for  which Dean Witter Trust  Company,
an  affiliate  of  the Investment  Manager,  serves as  recordkeeper  or Trustee
("Eligible 401(k) Plan"), provided that either: (A) the plan continues to be  an
Eligible  401(k)  Plan after  the  redemption; or     (B)  the redemption  is in
connection with the complete termination of the plan involving the  distribution
of all plan assets to participants.
 
    With  reference to (1) above, for the purpose of determining disability, the
Distributor utilizes the definition of disability contained in Section  72(m)(7)
of  the  Internal Revenue  Code, which  relates  to the  inability to  engage in
gainful employment. With reference  to (2) above,  the term "distribution"  does
not  encompass a direct transfer of  IRA, 403(b) Custodial Account or retirement
plan assets to  a successor custodian  or trustee. All  waivers will be  granted
only  following receipt by the Distributor  of confirmation of the shareholder's
entitlement.
 
REPURCHASE.  DWR and other Selected Broker-Dealers are authorized to  repurchase
shares  represented by a  share certificate which  is delivered to  any of their
offices. Shares held in a shareholder's account without a share certificate  may
also be repurchased by DWR and other Selected Broker-Dealers upon the telephonic
or telegraphic request of the shareholder. The repurchase price is the net asset
value  next computed (see "Purchase of Fund Shares") after such repurchase order
is received by DWR and other Selected Broker-Dealers, reduced by any  applicable
CDSC.
 
    The  CDSC, if  any, will  be the only  fee imposed  by either  the Fund, the
Distributor, DWR or other  Selected Broker-Dealers. The offer  by DWR and  other
Selected  Broker-Dealers to repurchase shares may be suspended without notice by
them at any time.  In that event, shareholders  may redeem their shares  through
the Fund's Transfer Agent as set forth above under "Redemption."
 
PAYMENT  FOR SHARES REDEEMED  OR REPURCHASED.  Payment  for shares presented for
repurchase or redemption will be made  by check within seven days after  receipt
by  the Transfer Agent of the certificate  and/or written request in good order.
Such payment may be postponed or the right of redemption suspended under unusual
circumstances, e.g., when  normal trading is  not taking place  on the New  York
Stock  Exchange. If the  shares to be  redeemed have recently  been purchased by
check, payment of the  redemption proceeds may be  delayed for the minimum  time
needed  to verify that the check used  for investment has been honored (not more
than fifteen days from the time of receipt of the check by the Transfer  Agent).
Shareholders   maintaining  margin   accounts  with  DWR   or  another  Selected
Broker-Dealer are referred to their account executive regarding restrictions  on
redemption of shares of the Fund pledged in the margin account.
 
REINSTATEMENT  PRIVILEGE.  A shareholder who has  had his or her shares redeemed
or repurchased and  has not  previously exercised  this reinstatement  privilege
may,  within  thirty  days  after  the date  of  the  redemption  or repurchase,
reinstate any portion or all of the proceeds of such redemption or repurchase in
shares of the  Fund at  net asset value  next determined  after a  reinstatement
request,  together  with the  proceeds, is  received by  the Transfer  Agent and
receive a pro-rata credit for any  CDSC paid in connection with such  redemption
or repurchase.
 
INVOLUNTARY  REDEMPTION.  The Fund reserves the  right to redeem, on sixty days'
notice and  at  net asset  value,  the shares  (other  than shares  held  in  an
Individual  Retirement Account or  Custodial Account under  Section 403(b)(7) of
the Internal Revenue Code) 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  Trustees  or,  in the  case  of  an  account  opened  through
EasyInvest-SM-,  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  intends to declare  dividends from net
investment income on each day the New  York Stock Exchange is open for  business
(see  "Purchase  of  Fund Shares").  The  amount  of the  dividend  declared may
fluctuate from day  to day.  Dividends are declared  daily and  paid monthly  in
additional shares of the Fund. The Fund intends to distribute dividends from net
short-term  and long-term capital  gains, if any,  at least once  each year. The
Fund
 
                                                                              13
<PAGE>
may, however, elect  to retain all  or a  portion of any  net long-term  capital
gains  in any year.  All dividends and  any capital gains  distributions will be
paid in additional Fund shares  and automatically credited to the  shareholder's
account  without issuance of a share certificate unless the shareholder requests
in writing that  all dividends  or all dividends  and distributions  be paid  in
cash.  (See  "Shareholder  Services--  Automatic  Investment  of  Dividends  and
Distributions".)
 
TAXES.  Because the Fund intends to distribute all of its net investment  income
and  capital  gains  to shareholders  and  otherwise  continue to  qualify  as a
regulated investment company under Subchapter M of the Internal Revenue Code, it
is not expected that the  Fund will be required to  pay any federal income  tax.
Shareholders who are required to pay taxes on their income will normally have to
pay  federal income  taxes, and  any state  income taxes,  on the  dividends and
distributions they receive from the  Fund. Such dividends and distributions,  to
the  extent that they are  derived from net investment  income or net short-term
capital gains,  are  taxable to  the  shareholder as  ordinary  dividend  income
regardless  of  whether the  shareholder  receives such  payments  in additional
shares or in cash. Any  dividends declared in the  last quarter of any  calendar
year  which are paid to  shareholders of record in  such period in the following
year prior to February 1 will be deemed received by the shareholder in the prior
calendar year.
 
    Long-term and  short-term capital  gains may  be generated  by the  sale  of
portfolio  securities by the Fund. Distributions of net long-term capital gains,
if any, are taxable to shareholders as long-term capital gains regardless of how
long a shareholder  has held  the Fund's shares  and regardless  of whether  the
distribution  is received in additional shares or  in cash. After the end of the
calendar year, shareholders will receive full information on their dividends and
capital gains distributions for  tax purposes, including  information as to  the
portion  taxable as ordinary income and the portion taxable as long-term capital
gains.
 
    To avoid being subject  to a 31% federal  backup withholding tax on  taxable
dividends,  capital  gains distributions  and  the proceeds  of  redemptions and
repurchases, shareholders' taxpayer identification numbers must be furnished and
certified as to accuracy. The foregoing discussion relates solely to the federal
income tax consequences of an investment in the Fund. Distributions may also  be
subject  to state  and local  taxes; therefore,  each shareholder  is advised to
consult his or her own tax adviser.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
From time to time the  Fund may quote its "yield"  and/or its "total return"  in
advertisements  and sales literature. Both the yield and the total return of the
Fund are based on  historical earnings and are  not intended to indicate  future
performance.  The  yield of  the Fund  is  computed by  dividing the  Fund's net
investment income over a  30-day period by an  average value (using the  average
number of shares entitled to receive dividends and the net asset value per share
at  the  end  of  the  period), all  in  accordance  with  applicable regulatory
requirements. Such amount is compounded for six months and then annualized for a
twelve-month period to derive the Fund's yield.
 
    The "average annual total return" of the Fund refers to a figure  reflecting
the  average annualized  percentage increase  (or decrease)  in the  value of an
initial investment in  the Fund  of $1,000  over periods  of one,  five and  ten
years,  or over the life of the Fund, if less than any of the foregoing. Average
annual total return reflects all income earned by the Fund, any appreciation  or
depreciation  of the Fund's  assets, all expenses  incurred by the  Fund and all
sales charges 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 over
different periods of time by means of aggregate, average, year-by-year or  other
types  of  total return  figures.  The Fund  may  also advertise  the  growth of
hypothetical investments of $10,000, $50,000 and $100,000 in shares of the Fund.
Such calculations  may  or may  not  reflect  the deduction  of  the  contingent
deferred  sales charge which, if reflected, would reduce the performance quoted.
The Fund  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.
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
VOTING RIGHTS.  All shares of beneficial  interest of the Fund are of $0.01  par
value and are equal as to earnings, assets and voting privileges.
 
    The  Fund is not  required to hold  Annual Meetings of  Shareholders and, in
ordinary circumstances, the  Fund does  not intend  to hold  such meetings.  The
Trustees  may call  Special Meetings of  Shareholders for  action by shareholder
vote as may be required by the Act or the Declaration of Trust.
 
    Under Massachusetts law, shareholders of a business trust may, under certain
circumstances, be  held personally  liable as  partners for  obligations of  the
Fund.  However,  the  Declaration of  Trust  contains an  express  disclaimer of
shareholder   liability    for    acts    or   obligations    of    the    Fund,
 
14
<PAGE>
requires  that  Fund  obligations  include  such  disclaimer,  and  provides for
indemnification out of the Fund's  property for any shareholder held  personally
liable  for  the  obligations of  the  Fund.  Thus, the  risk  of  a shareholder
incurring financial  loss on  account  of shareholder  liability is  limited  to
circumstances  in which the Fund itself would be unable to meet its obligations.
Given the above limitations on shareholder personal liability and the nature  of
the  Fund's assets and operations,  the possibility of the  Fund being unable to
meet its obligations is remote and,  in the opinion of Massachusetts counsel  to
the Fund, the risk to Fund shareholders of personal liability is remote.
 
CODE  OF ETHICS.  Directors, officers and employees of InterCapital, Dean Witter
Services Company Inc. and the Distributor are subject to a strict Code of Ethics
adopted by those companies. The  Code of Ethics is  intended to ensure that  the
interests  of shareholders  and other clients  are placed ahead  of any personal
interest, that no undue personal benefit is obtained from a person's  employment
activities  and that actual and potential  conflicts of interest are avoided. To
achieve these goals and comply with regulatory requirements, the Code of  Ethics
requires, among other things, that personal securities transactions by employees
of  the companies be subject to an  advance clearance process to monitor that no
investment company managed or  advised by InterCapital  ("Dean Witter Fund")  is
engaged at the same time in a purchase or sale of the same security. The Code of
Ethics  bans the purchase of securities in  an initial public offering, and also
prohibits  engaging  in  futures  and  options  transactions  and  profiting  on
short-term  trading (that is, a  purchase within sixty days of  a sale or a sale
within sixty  days  of  a  purchase) of  a  security.  In  addition,  investment
personnel  may not purchase or sell a security for their personal account within
thirty days before or after any transaction  in any Dean Witter Fund managed  by
them.  Any violations of the Code of  Ethics are subject to sanctions, including
reprimand, demotion  or suspension  or termination  of employment.  The Code  of
Ethics comports with regulatory requirements and the recommendations in the 1994
report by the Investment Company Institute Advisory Group on Personal Investing.
 
SHAREHOLDER  INQUIRIES.  All inquiries regarding  the Fund should be directed to
the Fund at the  telephone numbers or  address set forth on  the front cover  of
this Prospectus.
 
                                                                              15
<PAGE>
 
DEAN WITTER
INTERMEDIATE INCOME SECURITIES
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
TRUSTEES
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive
Officer
Sheldon Curtis
Vice President, Secretary and
General Counsel
Rochelle G. Siegel
Vice President
Thomas F. Caloia
Treasurer
 
CUSTODIAN
The Bank of New York
90 Washington Street
New York, New York 10286
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
Dean Witter Trust Company
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
INVESTMENT MANAGER
Dean Witter InterCapital Inc.


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