VANGUARD/WELLESLEY INCOME FUND INC
485BPOS, 1996-04-16
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<PAGE>   1
 
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                   FORM N-1A
                   REGISTRATION STATEMENT (NO. 2-31333) UNDER
                           THE SECURITIES ACT OF 1933
                          PRE-EFFECTIVE AMENDMENT NO.                        /X/
                        POST-EFFECTIVE AMENDMENT NO. 44                      /X/
                                      AND
 
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940
                                AMENDMENT NO. 44                             /X/
                      VANGUARD/WELLESLEY INCOME FUND, INC.
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
 
                     P.O. BOX 2600, VALLEY FORGE, PA 19482
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)
 
                  REGISTRANT'S TELEPHONE NUMBER (610) 669-1000
 
                         RAYMOND J. KLAPINSKY, ESQUIRE
                                  P.O. BOX 876
                             VALLEY FORGE, PA 19482
 
               IT IS PROPOSED THAT THIS FILING BECOME EFFECTIVE:
   
           on April 23, 1996, pursuant to paragraph (b) of Rule 485.
    
 
                 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
  As soon as practicable after this Registration Statement becomes effective.
 
   
     REGISTRANT ELECTS TO REGISTER AN INDEFINITE NUMBER OF SHARES PURSUANT TO
REGULATION 24F-2 UNDER THE INVESTMENT COMPANY ACT OF 1940. REGISTRANT FILED ITS
RULE 24F-2 NOTICE FOR THE YEAR ENDED DECEMBER 31, 1995 ON FEBRUARY 28, 1996.
    
 
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<PAGE>   2
 
                      VANGUARD/WELLESLEY INCOME FUND, INC.
 
                             CROSS REFERENCE SHEET
<TABLE>
<CAPTION>
                         FORM N-1A
                        ITEM NUMBER                                   LOCATION IN PROSPECTUS
<C>           <S>                                              <C>
    Item 1.   Cover Page....................................   Cover Page
    Item 2.   Synopsis......................................   Not Applicable
    Item 3.   Condensed Financial Information...............   Financial Highlights; Fund Expenses
    Item 4.   General Description of Registrant.............   Investment Objective; Investment
                                                               Limitations; Investment Policies;
                                                               General Information; Investment Risks
    Item 5.   Management of the Fund........................   Directors and Officers; Management of
                                                               the Fund; Investment Adviser
    Item 6.   Capital Stock and Other Securities............   Opening an Account and Purchasing
                                                               Shares; Selling Your Shares; The
                                                               Fund's Share Price; Dividends,
                                                               Capital Gains, and Taxes; General
                                                               Information
    Item 7.   Purchase of Securities Being Offered..........   Cover Page; Opening an Account and
                                                               Purchasing Shares
    Item 8.   Redemption or Repurchase......................   Selling Your Shares
    Item 9.   Pending Legal Proceedings.....................   Not Applicable
 
<CAPTION>
                         FORM N-1A                                     LOCATION IN STATEMENT
                        ITEM NUMBER                                  OF ADDITIONAL INFORMATION
<C>           <S>                                              <C>
   Item 10.   Cover Page....................................   Cover Page
   Item 11.   Table of Contents.............................   Cover Page
   Item 12.   General Information and History...............   Investment Objective; Investment
                                                               Policies; General Information
   Item 13.   Investment Objective and Policies.............   Investment Objective; Investment
                                                               Policies; Investment Limitations
   Item 14.   Management of the Fund........................   Management of the Fund; Investment
                                                               Advisory Services
   Item 15.   Control Persons and Principal Holders of
              Securities....................................   Management of the Fund; General
                                                               Information
   Item 16.   Investment Advisory and Other Services........   Management of the Fund; Investment
                                                               Advisory Services
   Item 17.   Brokerage Allocation..........................   Not Applicable
   Item 18.   Capital Stock and Other Securities............   General Information; Financial
                                                               Statements
   Item 19.   Purchase, Redemption and Pricing of Securities
              Being Offered.................................   Purchase of Shares; Redemption of
                                                               Shares
   Item 20.   Tax Status....................................   Appendix
   Item 21.   Underwriters..................................   Not Applicable
   Item 22.   Calculations of Yield Quotations of Money
              Market Fund...................................   Not Applicable
   Item 23.   Financial Statements..........................   Financial Statements
</TABLE>
<PAGE>   3
 
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[VANGUARD WELLESLEY
 INCOME FUND LOGO] 
                                                  A Member of The Vanguard Group
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PROSPECTUS -- APRIL 23, 1996
    
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NEW ACCOUNT INFORMATION: INVESTOR INFORMATION DEPARTMENT -- 1-800-662-7447
(SHIP)
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SHAREHOLDER ACCOUNT SERVICES: CLIENT SERVICES DEPARTMENT -- 1-800-662-2739
(CREW)
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INVESTMENT
OBJECTIVES &
POLICIES              Vanguard/Wellesley Income Fund, Inc. (the "Fund") is an
                      open-end diversified investment company that seeks to
                      provide as much current income as is consistent with
                      reasonable risk. The Fund also offers the potential for
                      moderate growth of capital. The Fund invests primarily in
                      U.S. Government and corporate fixed-income securities of
                      investment grade quality and dividend-paying common
                      stocks. There is no assurance that the Fund will achieve
                      its stated objectives. Shares of the Fund are neither
                      insured nor guaranteed by any agency of the U.S.
                      Government, including the FDIC.
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OPENING AN
ACCOUNT               To open a regular (non-retirement) account, please
                      complete and return the Account Registration Form. If you
                      need assistance in completing this Form, please call the
                      Investor Information Department. To open an Individual
                      Retirement Account (IRA), please use a Vanguard IRA
                      Adoption Agreement. To obtain a copy of this form, call
                      1-800-662-7447, Monday through Friday, from 8:00 a.m. to
                      9:00 p.m. and Saturday, from 9:00 a.m. to 4:00 p.m.
                      (Eastern time). The minimum initial investment is $3,000
                      or $1,000 for Uniform Gifts/Transfers to Minors Act
                      accounts. The Fund is offered on a no-load basis (i.e.,
                      there are no sales commissions or 12b-1 fees). However,
                      the Fund incurs expenses for investment advisory,
                      management, administrative, and distribution services.
    
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ABOUT THIS
PROSPECTUS            This Prospectus is designed to set forth concisely the
                      information you should know about the Fund before you
                      invest. It should be retained for future reference. A
                      "Statement of Additional Information" containing
                      additional information about the Fund has been filed with
                      the Securities and Exchange Commission. This Statement is
                      dated April 23, 1996, and has been incorporated by
                      reference into this Prospectus. It may be obtained,
                      without charge, by writing to the Fund or by calling the
                      Investor Information Department.
    
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TABLE OF CONTENTS
 
   
<TABLE>
<S>                                     <C>                                      <C>
                               Page                                       Page                                     Page
Fund Expenses ...................2      Investment Limitations ............ 8         SHAREHOLDER GUIDE
Financial Highlights ............2      Management of the Fund ...........  9      Opening an Account and
Yield and Total Return ..........3      Investment Adviser ...............  9        Purchasing Shares ............ 14
        FUND INFORMATION                Performance Record ............... 11      When Your Account Will Be
Investment Objectives ...........4      Dividends, Capital Gains                     Credited ..................... 17
Investment Policies .............4        and Taxes ...................... 11      Selling Your Shares ............ 17
Investment Risks ................5      The Share Price of the Fund ...... 12      Exchanging Your Shares ......... 19
Who Should Invest ...............6                                                 Important Information About
Implementation of Policies ......6      General Information ...............13        Telephone Transactions ....... 21
                                                                                   Transferring
                                                                                   Registration ................... 21
                                                                                   Other Vanguard Services ........ 22
</TABLE>
    
 
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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 COMMISSION PASSED UPON THE ACCURACY OR
ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE.
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<PAGE>   4
 
   
FUND EXPENSES         The following table illustrates ALL expenses and fees that
                      you would incur as a shareholder of the Fund. The expenses
                      and fees set forth below are for the 1995 fiscal year.
    
 
   
<TABLE>
                           <S>                                                                <C>       <C>
                                                    SHAREHOLDER TRANSACTION EXPENSES
                           -----------------------------------------------------------------------------------
                           Sales Load Imposed on Purchases...............................                None
                           Sales Load Imposed on Reinvested Dividends....................                None
                           Redemption Fees...............................................                None
                           Exchange Fees.................................................                None
                                                     ANNUAL FUND OPERATING EXPENSES
                           -----------------------------------------------------------------------------------
                           Management & Administrative Expenses..........................                0.24%
                           Investment Advisory Fees......................................                0.07
                           12b-1 Fees....................................................                None
                           Other Expenses
                             Distribution Costs..........................................     0.02%
                             Miscellaneous Expenses......................................     0.02
                                                                                              ----
                           Total Other Expenses..........................................                0.04
                                                                                                        ------
                                    TOTAL OPERATING EXPENSES.............................                0.35%
                                                                                                        ======
</TABLE>
    
 
                      The purpose of this table is to assist you in
                      understanding the various costs and expenses that you
                      would bear directly or indirectly as an investor in the
                      Fund.
 
                      The following example illustrates the expenses that you
                      would incur on a $1,000 investment over various periods,
                      assuming (1) a 5% annual rate of return and (2) redemption
                      at the end of each period. As noted in the table above,
                      the Fund charges no redemption fees of any kind.
 
   
<TABLE>
<CAPTION>
                                1 YEAR       3 YEARS       5 YEARS       10 YEARS
                                ------       -------       -------       --------
                                <S>           <C>           <C>           <C>
                                  $ 4           $11           $20           $ 44
</TABLE>
    
 
                      THIS EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF
                      PAST OR FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES
                      MAY BE HIGHER OR LOWER THAN THOSE SHOWN.
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FINANCIAL
HIGHLIGHTS            The following financial highlights for a share outstanding
                      throughout each period, insofar as they relate to each of
                      the five years in the period ended December 31, 1995, have
                      been audited by Price Waterhouse LLP, independent
                      accountants, whose report thereon was unqualified. This
                      information should be read in conjunction with the Fund's
                      financial statements and notes thereto, which, together
                      with the remaining portions of the Fund's 1995 Annual
                      Report to Shareholders, are incorporated by reference in
                      the Statement of Additional Information and in this
                      Prospectus, and which appear, along with the report of
                      Price Waterhouse LLP, in the Fund's 1995 Annual Report to
                      Shareholders. For a more complete discussion of the Fund's
                      performance, please see the Fund's 1995 Annual Report to
                      Shareholders which may be obtained without charge by
                      writing to the Fund or by calling our Investor Information
                      Department at 1-800-662-7447.
    
 
                                        2
<PAGE>   5
 
   
<TABLE>
<CAPTION>
                                                                YEAR ENDED DECEMBER 31,
                             ----------------------------------------------------------------------------------------------------
                        1995       1994       1993       1992       1991       1990       1989       1988       1987       1986
<S>                    <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
  BEGINNING OF
  YEAR...............  $17.05     $19.24     $18.16     $18.08     $16.02     $16.82     $15.26     $14.57     $16.27     $ 15.31
                       ------     ------     ------     ------     ------     ------     ------     ------     ------     -------
INVESTMENT OPERATIONS
  Net Investment
    Income...........    1.13       1.11       1.14       1.21       1.27       1.30       1.32       1.23       1.24        1.33
  Net Realized and
    Unrealized Gain
    (Loss) on
    Investments......    3.68      (1.95)      1.48        .29       2.06       (.72)      1.79        .69      (1.52)       1.43
                       ------     ------     ------     ------     ------     ------     ------     ------     ------      ------
    TOTAL FROM
      INVESTMENT
      OPERATIONS.....    4.81       (.84)      2.62       1.50       3.33        .58       3.11       1.92       (.28)       2.76
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DISTRIBUTIONS
  Dividends from Net
    Investment
    Income...........   (1.14)     (1.11)     (1.14)     (1.21)     (1.27)     (1.30)     (1.31)     (1.23)     (1.04)     (1.33)
  Distributions from
    Realized Capital
    Gains............    (.28)      (.24)      (.40)      (.21)        --       (.08)      (.24)        --       (.38)      (.47)
                       ------     ------     ------     ------     ------     ------     ------     ------     ------      ------
    TOTAL
     DISTRIBUTIONS...   (1.42)     (1.35)     (1.54)     (1.42)     (1.27)     (1.38)     (1.55)     (1.23)     (1.42)     (1.80)
- ---------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
  END OF YEAR........  $20.44     $17.05     $19.24     $18.16     $18.08     $16.02     $16.82     $15.26     $14.57     $ 16.27
=================================================================================================================================
TOTAL RETURN.........   28.91%     (4.44)%    14.65%      8.67%     21.57%      3.76%     20.93%     13.61%     (1.92)%    18.34%
=================================================================================================================================
RATIOS/SUPPLEMENTAL
  DATA
Net Assets, End of
  Year (Millions)....  $7,181     $5,681     $6,011     $3,178     $1,934     $1,022       $788       $567       $495        $510
Ratio of Expenses to
  Average Net
  Assets.............     .35%+      .34%       .33%       .35%       .40%       .45%       .45%       .51%       .49%       .58%
Ratio of Net
  Investment
  Income to Average
  Net Assets.........    5.96%      6.16%      5.79%      6.50%      7.08%      7.77%      7.68%      8.14%      7.83%      7.74%
Portfolio Turnover
  Rates:
  Common Stocks......      27%        32%        26%        16%        19%        12%        10%        19%        27%        18%
  Bonds..............      32%        31%        18%        24%        34%        23%        11%        21%        48%        39%
</TABLE>
    
 
   
+ Effective in 1995, does not include reductions from directed brokerage
  arrangements. The 1995 Ratio of Expenses to Average Net Assets is .34% after
  including these reductions.
    
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YIELD AND TOTAL
RETURN                From time to time the Fund may advertise its yield and
                      total return. Both yield and total return figures are
                      based on historical earnings and are not intended to
                      indicate future performance. The "total return" of the
                      Fund refers to the average annual compounded rates of
                      return over one-, five- and ten- year periods or for the
                      life of the Fund (as stated in the advertisement) that
                      would equate an initial amount invested at the beginning
                      of a stated period to the ending redeemable value of the
                      investment, assuming the reinvestment of all dividend and
                      capital gains distributions.
 
                      In accordance with industry guidelines set forth by the
                      U.S. Securities and Exchange Commission, the "30-day
                      yield" of the Fund is calculated by dividing net
                      investment income per share earned during a 30-day period
                      by the net asset value per share on the last day of the
                      period. Net investment income includes interest and
                      dividend income earned on the Fund's securities; it is net
                      of all expenses and all recurring and nonrecurring charges
                      that have been applied to all shareholder accounts. The
                      yield calculation assumes that net investment income
                      earned over
 
                                        3
<PAGE>   6
 
   
                      30 days is compounded monthly for six months and then
                      annualized. Methods used to calculate advertised yields
                      are standardized for all stock and bond mutual funds.
                      However, these methods differ from the accounting methods
                      used by the Fund to maintain its books and records, and so
                      the advertised 30-day yield may not fully reflect the
                      income paid to an investor's account.
    
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INVESTMENT
OBJECTIVES

THE FUND SEEKS TO
PROVIDE CURRENT
INCOME AND MODERATE
CAPITAL GROWTH
                      The Fund is an open-end diversified investment company.
                      The objective of the Fund is to provide as much current
                      income as is consistent with reasonable risk. The Fund
                      also offers the potential for moderate growth of capital.
                      The Fund invests primarily in U.S. Government and
                      corporate fixed-income securities of investment grade
                      quality and dividend-paying common stocks.
    
 
                      There is no assurance that the Fund will achieve its
                      stated objectives.
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INVESTMENT
POLICIES

THE FUND INVESTS IN
BONDS AND COMMON
STOCKS
                      The Fund invests in fixed-income securities and
                      dividend-paying common stocks. Under normal circumstances,
                      it is expected that fixed-income securities will represent
                      approximately 60% of the Fund's net assets. The remainder
                      of the Fund's assets will be invested primarily in common
                      stocks chosen largely for their income characteristics.
                      The Fund will invest at least 65% of its assets in
                      income-producing securities under normal circumstances.
                      The Fund is managed without regard to tax ramifications.
 
   
                      The fixed-income securities owned by the Fund will include
                      U.S. Government and corporate bonds and mortgage-backed
                      securities (such as Government National Mortgage
                      Association pass-through certificates), asset-backed
                      securities, U.S. dollar-denominated debt securities issued
                      by foreign governments, their agencies and
                      instrumentalities, supranational entities and companies
                      located outside the U.S., as well as bonds or preferred
                      stocks which are convertible into common stock.
                      Fixed-income securities will be primarily of investment
                      grade quality -- i.e., those rated at least Baa by Moody's
                      Investors Service, Inc. or BBB by Standard & Poor's
                      Corporation. Securities rated Baa or BBB are considered as
                      medium grade obligations. Interest and principal payments
                      for such bonds are regarded as adequate for the present
                      but certain protective elements found in higher-rated
                      bonds may be lacking. Such bonds lack outstanding
                      investment characteristics and, in fact, have speculative
                      characteristics as well.
    
 
                      The mix of bonds and stocks held by the Fund may be varied
                      from time to time depending on the investment adviser's
                      assessment of business, economic and investment
                      conditions. However, fixed-income securities can be
                      expected to represent the majority of the Fund's assets so
                      long as the general level of interest rates remains well
                      in excess of dividend yields available on common stocks.
 
                      In addition to investing in fixed-income securities and
                      dividend-paying common stocks, the Fund may also invest in
                      certain short-term fixed income securities as cash
                      reserves. The Fund is also authorized to invest in stock
                      and bond futures contracts and options to a limited
                      extent. See "Implementation of Policies" for a description
                      of these and other investment practices of the Fund.
 
                                        4
<PAGE>   7
 
   
                      The Fund is responsible for voting the shares of all
                      securities it holds.
    
 
                      The investment objectives and policies of the Fund are not
                      fundamental and so may be changed by the Board of
                      Directors without shareholder approval. However,
                      shareholders would be notified prior to a material change
                      in either.
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INVESTMENT RISKS

THE FUND IS SUBJECT
TO INTEREST RATE AND
STOCK MARKET RISK
                      Like any investment program, the Fund entails certain
                      risks. The Fund is subject to the risk that bond or stock
                      prices will decline during short or even extended periods.
 
   
                      The Fund is expected to invest the majority of its assets
                      (63% as of December 31, 1995) in longer-term fixed income
                      securities, such as government and corporate bonds. Bond
                      prices are influenced primarily by changes in the level of
                      interest rates. When interest rates rise, bond prices
                      generally fall; conversely, when interest rates fall, bond
                      prices generally rise. While bonds normally fluctuate less
                      than stocks, there have been extended periods of increases
                      in interest rates that have caused significant price
                      declines. For example, long-term U.S. government bonds
                      prices fell 48% from December 1976 to September 1981. The
                      risk of bond holdings declining in value, however, may be
                      offset in whole or in part by the high level of income
                      that bonds provide.
    
 
   
                      A smaller portion of the Fund's assets will be invested in
                      stocks (37% of assets as of December 31, 1995). The stock
                      market tends to be cyclical, with periods when stock
                      prices generally rise and periods when stock prices
                      generally decline. Common stocks have provided annual
                      total returns (capital appreciation plus dividend income)
                      averaging +10.7% for all 10-year periods from 1926 to
                      1995. This level of return can be used as a guide for
                      setting reasonable expectations for future stock market
                      returns, but may not be useful for forecasting future
                      returns in any particular period, as stock returns are
                      quite volatile from year to year. For example, in the
                      period from 1926 to 1995, the range of annual returns on
                      the S&P 500 Index was +53.9% to -43.3%. Over longer-term
                      holding periods, stocks tend to be less volatile. For
                      five-year periods since 1926, the annualized rates of
                      return for the S&P 500 Index ranged from +23.9% to -12.5%.
    
 
                      In large part, the common stocks held by the Fund will be
                      selected for their current income and potential growth in
                      income. The aggregate characteristics of such stocks will
                      tend to be quite different from those exhibited by the S&P
                      500 Index. As a result, investors should anticipate that
                      the common stocks in the Fund may perform differently than
                      those in the Index.
 
   
                      From time to time, the stock and bond markets may
                      fluctuate independently of one another. In other words, a
                      decline in the stock market may be offset by a rise in the
                      bond market, or vice versa. As a result, the Fund with its
                      balance of common stock and bond investments, is expected
                      to entail less investment risk (and a potentially lower
                      return) than a mutual fund investing exclusively in common
                      stocks.
    
 
   
                      From the Fund's inception on July 1, 1970 to December 31,
                      1995, the Fund has provided an average annual return of
                      +11.6%. During this period, the Fund has experienced 21
                      years of positive returns and four years of negative
                      returns. Annual returns have ranged from +28.9% to -6.4%.
                      These return characteristics are
    
 
                                        5
<PAGE>   8
 
                      provided to illustrate the risks and returns that the Fund
                      has provided in the past and may not be indicative of
                      future results.
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WHO SHOULD
INVEST

INVESTORS SEEKING A
CURRENT INCOME OR
A CONSERVATIVE "TOTAL
RETURN" INVESTMENT    The Fund is designed for investors seeking a high level of
                      current income from a portfolio of bonds and stocks.
                      Because of the risks associated with common stock and bond
                      investments, the Fund is intended to be a long-term
                      investment vehicle and is not designed to provide
                      investors with a means of speculating on short-term market
                      movements. Investors who engage in excessive account
                      activity generate additional costs which are borne by all
                      of the Fund's shareholders. In order to minimize such
                      costs, the Fund has adopted the following policies. The
                      Fund reserves the right to reject any purchase request
                      (including exchange purchases from other Vanguard
                      portfolios) that is reasonably deemed to be disruptive to
                      efficient portfolio management, either because of the
                      timing of the investment or previous excessive trading by
                      the investor. Additionally, the Fund has adopted exchange
                      privilege limitations as described in the section
                      "Exchange Privilege Limitations." Finally, the Fund
                      reserves the right to suspend the offering of its shares.
                      Although capital appreciation is not a primary objective
                      of the Fund, the Fund's investment in common stocks may
                      provide modest growth in income and capital over time.
                      Thus, the Fund is also suitable for conservative "total
                      return" investors who seek to build capital gradually,
                      through moderate appreciation and the compounding of
                      income.
 
                      Because of the inevitable fluctuations in bond and stock
                      prices, the share price of the Fund is expected to
                      fluctuate, sometimes substantially. Investors should be
                      able to tolerate such fluctuations in the value of their
                      investment in pursuit of the current income and moderate
                      growth that the Fund may provide. Investors may wish to
                      reduce the potential risk of investing in the Fund by
                      purchasing shares on a regular, periodic basis
                      (dollar-cost averaging) rather than making an investment
                      in one lump sum.
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IMPLEMENTATION
OF POLICIES           In addition to investing primarily in fixed-income
                      securities and dividend-paying common stocks, the Fund
                      uses a number of other investment vehicles to achieve its
                      objective.
 
   
THE FUND MAY INVEST
IN SHORT-TERM FIXED
INCOME SECURITIES     The Fund may invest temporarily in certain short-term
                      fixed income securities. Such securities may be used to
                      invest uncommitted cash balances, to maintain liquidity to
                      meet shareholder redemptions, or to take a temporary
                      defensive position against potential stock market
                      declines. These securities include: obligations of the
                      United States Government and its agencies or
                      instrumentalities; commercial paper, bank certificates of
                      deposit, and bankers' acceptances; and repurchase
                      agreements collateralized by these securities.
    
 
   
THE FUND MAY INVEST
IN SECURITIES OF
FOREIGN ISSUERS       The Fund may invest up to 15% of its equity assets in
                      foreign common stocks and securities convertible into
                      foreign common stocks, and may engage in currency
                      transactions with respect to these investments. The Fund
                      may also invest in fixed income securities of foreign
                      issuers, but all such securities must be denominated in
                      U.S. dollars and must meet the Fund's credit quality
                      standards. Securities of foreign
    
 
                                        6
<PAGE>   9
 
   
                      issuers may trade in U.S. or foreign securities markets.
                      Securities of foreign issuers may involve investment risks
                      that are different from those of domestic issuers. Such
                      risks include the effect of foreign economic policies and
                      conditions, future political and economic developments,
                      and the possible imposition of exchange controls or other
                      foreign governmental restrictions on foreign issuers.
                      There may also be less publicly available information
                      about a foreign issuer than a domestic issuer of
                      securities. Foreign issuers are generally not subject to
                      the uniform accounting, auditing and financial reporting
                      standards that apply to domestic issuers. Also, foreign
                      markets may be characterized by lower liquidity, greater
                      price volatility, and higher transactions costs.
                      Additionally, it may be difficult to obtain or enforce a
                      legal judgment in a foreign court.
    
 
   
THE FUND MAY LEND
ITS SECURITIES        The Fund may lend its investment securities to qualified
                      institutional investors for the short-term or long-term
                      purpose of realizing additional income. Loans of
                      securities by the Fund will be collateralized by cash,
                      letters of credit, or securities issued or guaranteed by
                      the U.S. Government or its agencies. The collateral will
                      equal at least 100% of the current market value of the
                      loaned securities.
    
 
PORTFOLIO TURNOVER
IS NOT EXPECTED TO
EXCEED 40%            Although it generally seeks to invest for the long term,
                      the Fund retains the right to sell securities irrespective
                      of how long they have been held. It is anticipated that
                      the annual portfolio turnover of the Fund will not exceed
                      40%. A turnover rate of 40% would occur, for example, if
                      four-tenths of the securities of the Fund were replaced
                      within one year.
 
   
DERIVATIVE
INVESTING
                      Derivatives are instruments whose values are linked to or
                      derived from an underlying security or index. The most
                      common and conventional types of derivative securities are
                      futures and options.
    
 
   
THE FUND MAY
INVEST IN DERIVATIVE
SECURITIES
                      The Fund may invest in futures contracts and options, but
                      only to a limited extent. Specifically, the Fund may enter
                      into futures contracts provided that not more than 5% of
                      its assets are required as a futures contract deposit; in
                      addition, the Fund may enter into futures contracts and
                      options transactions only to the extent that obligations
                      under such contracts or transactions represent not more
                      than 20% of the Fund's assets.
    
 
   
                      Futures contracts and options may be used for several
                      common fund management strategies: to maintain cash
                      reserves while simulating full investment, to facilitate
                      trading, to reduce transaction costs, or to seek higher
                      investment returns when a specific futures contract is
                      priced more attractively than other futures contracts or
                      the underlying security or index.
    
 
   
                      The Fund may use futures contracts for bona fide "hedging"
                      purposes. In executing a hedge, a manager sells, for
                      example, stock index futures to protect against a decline
                      in the stock market. As such, if the market drops, the
                      value of the futures position will rise, thereby
                      offsetting the decline in value of the Fund's stock
                      holdings.
    
 
   
THE FUND MAY
INVEST IN CMOS        The Fund may also invest modestly in a fairly conservative
                      class of collateralized mortgage obligations (CMOs) which
                      feature a high degree of cash flow predictability and
                      moderate vulnerability to mortgage prepayment risk. To
                      reduce credit risk,
    
 
                                        7
<PAGE>   10
 
   
                      Vanguard purchases these less risky classes of
                      collateralized mortgage obligations issued only by
                      agencies of the U.S. Government or privately-issued
                      collateralized mortgage obligations that carry
                      high-quality investment-grade ratings.
    
 
   
FUTURES CONTRACTS
AND OPTIONS POSE
CERTAIN RISKS
                      The primary risks associated with the use of futures
                      contracts and options are: (i) imperfect correlation
                      between the change in market value of the stocks or bonds
                      held by the Fund and the prices of futures contracts and
                      options; and (ii) possible lack of a liquid secondary
                      market for a futures contract and the resulting inability
                      to close a futures position prior to its maturity date.
                      The risk of imperfect correlation will be minimized by
                      investing in those contracts whose price fluctuations are
                      expected to resemble those of the Fund's underlying
                      securities. The risk that the Fund will be unable to close
                      out a futures position will be minimized by entering into
                      such transactions on a national exchange with an active
                      and liquid secondary market.
    
 
   
                      The risk of loss in trading futures contracts in some
                      strategies can be substantial, due both to the low margin
                      deposits required and the extremely high degree of
                      leverage involved in futures pricing. As a result, a
                      relatively small price movement in a futures contract may
                      result in immediate and substantial loss (or gain) to the
                      investor. When investing in futures contracts, the Fund
                      will segregate cash or cash equivalents in the amount of
                      the underlying obligation.
    
- --------------------------------------------------------------------------------
 
INVESTMENT
LIMITATIONS           The Fund has adopted certain limitations on its investment
                      practices. Specifically, the Fund will not:
 
THE FUND HAS ADOPTED
CERTAIN FUNDAMENTAL
LIMITATIONS           (a) invest more than 25% of its assets in any one
                          industry;
                      (b) with respect to 75% of the value of its total assets,
                          purchase the securities of any issuer (except
                          obligations of the United States Government and its
                          instrumentalities) if as a result the Fund would hold
                          more than 10% of the outstanding voting securities of
                          the issuer, or more than 5% of the value of the Fund's
                          total assets would be invested in the securities of
                          such issuer;
                      (c) borrow money, except that the Fund may borrow from
                          banks (or through reverse repurchase agreements), for
                          temporary or emergency (not leveraging) purposes,
                          including the meeting of redemption requests which
                          might otherwise require the untimely disposition of
                          securities, in an amount not exceeding 10% of the
                          value of the Fund's net assets (including the amount
                          borrowed and the value of any outstanding reverse
                          repurchase agreements) at the time the borrowing is
                          made. Whenever borrowings exceed 5% of the value of
                          the Fund's net assets, the Fund will not make any
                          additional investments.
 
   
                      These investment limitations are considered at the time
                      investment securities are purchased. The investment
                      limitations described here and in the Statement of
                      Additional Information are fundamental and may be changed
                      only with the approval of a majority of the Fund's
                      shareholders.
    
- --------------------------------------------------------------------------------
 
                                        8
<PAGE>   11
 
   
MANAGEMENT
OF THE FUND
VANGUARD ADMINISTERS
AND DISTRIBUTES THE
FUND                  The Fund is a member of The Vanguard Group of Investment
                      Companies, a family of more than 30 investment companies
                      with more than 90 distinct investment portfolios and total
                      assets in excess of $190 billion. Through their
                      jointly-owned subsidiary, The Vanguard Group, Inc.
                      ("Vanguard"), the Fund and the other funds in the Group
                      obtain at cost virtually all of their corporate
                      management, administrative and distribution services.
                      Vanguard also provides investment advisory services on an
                      at-cost basis to certain Vanguard funds. As a result of
                      Vanguard's unique corporate structure, the Vanguard funds
                      have costs substantially lower than those of most
                      competing mutual funds. In 1995, the average expense ratio
                      (annual costs including advisory fees divided by total net
                      assets) for the Vanguard funds amounted to approximately
                      .31% compared to an average of 1.11% for the mutual fund
                      industry (data provided by Lipper Analytical Services).
    
 
                      The Officers of the Fund manage its day-to-day operations
                      and are responsible to the Fund's Board of Directors. The
                      Directors set broad policies for the Fund and choose its
                      Officers. A list of the Directors and Officers of the Fund
                      and a statement of their present positions and principal
                      occupations during the past five years can be found in the
                      Statement of Additional Information.
 
   
                      Vanguard employs a supporting staff of management and
                      administrative personnel to provide the requisite services
                      to the funds and also furnishes the funds with necessary
                      office space, furnishings and equipment. Each fund pays
                      its share of Vanguard's net expenses, which are allocated
                      among the funds under methods approved by the Board of
                      Directors (Trustees) of each fund. In addition, each fund
                      bears its own direct expenses, such as legal, auditing and
                      custodian fees.
    
 
                      Vanguard provides distribution and marketing services to
                      the funds. The funds are available on a no-load basis
                      (i.e., there are no sales commissions or 12b-1 fees).
                      However, each fund bears its share of the Group's
                      distribution costs.
- --------------------------------------------------------------------------------
 
INVESTMENT
ADVISER
WELLINGTON
MANAGEMENT COMPANY
SERVES AS ADVISER
TO THE FUND           The Fund has entered into an investment advisory agreement
                      with Wellington Management Company ("WMC"), 75 State
                      Street, Boston, MA 02109, under which WMC manages the
                      investment and reinvestment of the Fund's assets and
                      continuously reviews, supervises and administers the
                      Fund's investment program. WMC discharges its
                      responsibility subject to the control of the Officers and
                      Directors of the Fund.
 
   
                      WMC is a professional investment advisory firm which
                      globally provides investment services to investment
                      companies, institutions and individuals. Among the clients
                      of WMC are more than 10 of the investment companies of The
                      Vanguard Group. As of December 31, 1995, WMC held
                      discretionary management authority with respect to more
                      than $108 billion of assets. WMC and its predecessor
                      organizations have provided investment advisory services
                      to investment companies since 1933 and to investment
                      counseling clients since 1960.
    
 
   
                      Earl E. McEvoy, Senior Vice President of WMC, serves as
                      portfolio manager of the Fund, a position he has held
                      since October 1982. Mr. McEvoy is assisted by John R.
                      Ryan, Senior Vice President and a managing partner of WMC,
                      who has managed the
    
 
                                        9
<PAGE>   12
 
                      Fund's equity investments since January 1986. Messrs.
                      McEvoy and Ryan are supported by research and other
                      investment services provided by the professional staff of
                      WMC.
 
                      The Fund pays WMC a basic advisory fee calculated by
                      applying varying percentage rates to the average net
                      assets of the Fund:
 
   
<TABLE>
<CAPTION>
                                            NET ASSETS          RATE
                                       ----------------        -----
                                       <S>                     <C>
                                       First $1 billion        .100%
                                       Next $2 billion         .050%
                                       Next $7 billion         .040%
                                       Over $10 billion        .030%
</TABLE>
    
 
   
                      Effective with the quarter ending March 31, 1997, the
                      basic advisory fee may be increased or decreased by
                      applying an adjustment formula based on the investment
                      performance of the Fund relative to the investment
                      performance of a "composite index." This composite index
                      comprises the Lehman Long-Term Corporate AA or Better Bond
                      Index (65%) and a 35% weighting in a blended equity
                      composite (75% Standard & Poor's/BARRA Value Index and 25%
                      Standard & Poor's Utilities Index).
    
 
   
                      During the fiscal year ended December 31, 1995, the total
                      advisory fees paid by the Fund to WMC represented an
                      effective annual base rate of .07 of 1% of the Fund's
                      average net assets. This fee was paid under a previous fee
                      schedule that provided for a higher rate of fees.
    
 
                      The investment advisory agreement authorizes WMC to select
                      brokers or dealers to execute purchases and sales of the
                      Fund's portfolio securities, and directs WMC to use its
                      best efforts to obtain the best available price and most
                      favorable execution with respect to all transactions. The
                      full range and quality of brokerage services are
                      considered in making these determinations.
 
                      The Fund has authorized WMC to pay higher commissions in
                      recognition of brokerage services felt necessary for the
                      achievement of better execution, provided WMC believes
                      this to be in the best interest of the Fund. Although the
                      Fund does not market its shares through intermediary
                      brokers or dealers, the Fund may place orders with
                      qualified broker-dealers who recommend the Fund to clients
                      if the Officers of the Fund believe that the quality of
                      the transaction and the commission are comparable to what
                      they would be with other qualified brokerage firms.
 
                      The Fund's Board of Directors may, without the approval of
                      shareholders, provide for: (a) the employment of a new
                      investment adviser pursuant to the terms of a new advisory
                      agreement either as a replacement for an exiting adviser
                      or as an additional adviser; (b) a change in the terms of
                      an advisory agreement; and (c) the continued employment of
                      an existing adviser on the same advisory contract terms
                      where a contract has been assigned because of a change in
                      control of the adviser. Any such change will only be made
                      upon not less than 30 days' prior written notice to
                      shareholders of the Fund which shall include substantially
                      the information concerning the adviser that would have
                      normally been included in a proxy statement.
- --------------------------------------------------------------------------------
 
                                       10
<PAGE>   13
 
   
PERFORMANCE
RECORD                The table in this section provides investment results for
                      the Fund for several periods throughout the Fund's
                      lifetime. The results shown represent "total return"
                      investment performance, which assumes the reinvestment of
                      all capital gains and income dividends for the indicated
                      periods. Also included is comparative information with
                      respect to two performance indexes: a Composite Index,
                      comprised of 65% of the Lehman Long-Term Corporate AA or
                      Better Bond Index and a 35% weighting in a blended equity
                      composite (75% Standard & Poor's/BARRA Value Index and 25%
                      Standard & Poor's Utility Index); and the Consumer Price
                      Index, a statistical measure of changes in the prices of
                      goods and services. The tables do not make any allowance
                      for federal, state or local income taxes, which
                      shareholders must pay on a current basis.
    
 
                      The results shown should not be considered a
                      representation of the total return from an investment made
                      in the Fund today. This information is provided to help
                      investors better understand the Fund and may not provide a
                      basis for comparison with other investments or mutual
                      funds which use a different method to calculate
                      performance.
   
<TABLE>
<CAPTION>
                                                               AVERAGE ANNUAL RETURN FOR
                                                          VANGUARD/WELLESLEY INCOME FUND
                        <S>                <C>                    <C>           <C>
                                           ---------------------------------------------
 
<CAPTION>
                        FISCAL PERIODS     VANGUARD/WELLESLEY     COMPOSITE     CONSUMER    
                        ENDED 12/31/95           INCOME             INDEX         PRICE
                                                  FUND                            INDEX
                        ---------------     -----------------      --------      -------
                                                 
                        <S>                <C>                    <C>           <C>
                        1 Year                    +28.9%            +31.3%        +2.6%
                        5 Years                   +13.3             +14.0         +2.8
                        10 Years                  +11.9             +12.7         +3.5
                        Lifetime*                 +11.6             +11.1         +5.5

                        * July 1, 1970 to December 31, 1995.
</TABLE>
    
 
- --------------------------------------------------------------------------------
 
DIVIDENDS,
CAPITAL GAINS
AND TAXES

THE FUND PAYS
QUARTERLY DIVIDENDS
AND ANY CAPITAL
GAINS ANNUALLY        The Fund expects to pay dividends quarterly from ordinary
                      income. Net capital gain distributions, if any, will be
                      made annually.
 
                      Dividend and capital gains distributions may be
                      automatically reinvested or received in cash. See
                      "Choosing a Distribution Option" for a description of
                      these distribution methods.
 
                      In addition, in order to satisfy certain distribution
                      requirements of the Tax Reform Act of 1986, the Fund may
                      declare special year-end dividend and capital gains
                      distributions during December. Such distributions, if
                      received by shareholders by January 31, are deemed to have
                      been paid by the Fund and received by shareholders on
                      December 31 of the prior year.
 
                      The Fund intends to continue to qualify for taxation as a
                      "regulated investment company" under the Internal Revenue
                      Code so that it will not be subject to federal income tax
                      to the extent its income is distributed to shareholders.
                      Dividends paid by the Fund from net investment income and
                      net short-term capital gains, whether received in cash or
                      reinvested in additional shares, will be taxable to
                      shareholders as ordinary income. For corporate investors,
                      dividends from net investment income will generally
                      qualify in part for the intercorporate dividends-received
                      deduction.
 
                                       11
<PAGE>   14
 
                      However, the portion of the dividends so qualified depends
                      on the aggregate taxable qualifying dividend income
                      received by the Fund from domestic (U.S.) sources.
 
                      Distributions paid by the Fund from long-term capital
                      gains, whether received in cash or reinvested in
                      additional shares, are taxable as long-term capital gains,
                      regardless of the length of time you have owned shares in
                      the Fund. Capital gains distributions are made when the
                      Fund realizes net capital gains on sales of portfolio
                      securities during the year. The Fund does not seek to
                      realize any particular amount of capital gains during a
                      year; rather, realized gains are a by-product of portfolio
                      management activities. Consequently, capital gains
                      distributions may be expected to vary considerably from
                      year to year; there will be no capital gains distributions
                      in years when the Fund realizes net capital losses.
 
                      Note that if you accept capital gains distributions in
                      cash, instead of reinvesting them in additional shares,
                      you are in effect reducing the capital at work for you in
                      the Fund. Also, keep in mind that if you purchase shares
                      in the Fund shortly before the record date for a dividend
                      or capital gains distribution, a portion of your
                      investment will be returned to you as a taxable
                      distribution, regardless of whether you are reinvesting
                      your distributions or receiving them in cash.
 
                      The Fund will notify you annually as to the tax status of
                      dividend and capital gains distributions paid by the Fund.
 
A CAPITAL GAIN OR
LOSS MAY BE REALIZED
UPON EXCHANGE OR
REDEMPTION            A sale of shares of the Fund is a taxable event, and may
                      result in a capital gain or loss. A capital gain or loss
                      may be realized from an ordinary redemption of shares or
                      an exchange of shares between two mutual funds (or two
                      portfolios of a mutual fund).
 
                      Dividend distributions, capital gains distributions, and
                      capital gains or losses from redemptions and exchanges may
                      be subject to state and local taxes.
 
                      The Fund is required to withhold 31% of taxable dividends,
                      capital gains distributions, and redemptions paid to
                      shareholders who have not complied with IRS taxpayer
                      identification regulations. You may avoid this withholding
                      requirement by certifying on your Account Registration
                      Form your proper Social Security or Employer
                      Identification Number and by certifying that you are not
                      subject to backup withholding.
 
                      The Fund has obtained a Certificate of Authority to do
                      business as a foreign corporation in Pennsylvania and does
                      business and maintains an office in that state. In the
                      opinion of counsel, the shares of the Fund will be exempt
                      from Pennsylvania personal property taxes.
 
                      The tax discussion set forth above is included for general
                      information only. Prospective investors should consult
                      their own tax advisers concerning the tax consequences of
                      an investment in the Fund.
- --------------------------------------------------------------------------------
 
   
THE SHARE PRICE
OF THE FUND           The Fund's share price or "net asset value" per share is
                      determined by dividing the total market value of the
                      Fund's investments and other assets, less any liabilities,
                      by the number of outstanding shares of the Fund. Net asset
                      value per share is determined as of the close of the New
                      York Stock Exchange (generally 4:00 p.m.
    
 
                                       12
<PAGE>   15
 
   
                      Eastern time) on each day that the Exchange is open for
                      trading. Portfolio securities that are listed on a
                      securities exchange are valued at the last quoted sales
                      price on the day the valuation is made. Price information
                      on listed securities is taken from the exchange where the
                      security is primarily traded. Securities which are listed
                      on an exchange and which are not traded on the valuation
                      date are valued at the mean between the bid and asked
                      prices. Unlisted securities for which market quotations
                      are readily available and preferred stocks are valued at
                      the latest quoted bid price.
    
 
   
                      Securities may be valued on the basis of prices provided
                      by a pricing service when such prices are believed to
                      reflect the fair market value of such securities. For
                      bonds and other fixed-income securities, the prices
                      provided by a pricing service may be determined without
                      regard to bid or last sale prices of each security but
                      take into account institutional-size trading in similar
                      groups of securities and any developments related to
                      specific securities. Short-term instruments (with
                      remaining maturities of 60 days or less) are valued at
                      cost, plus or minus any amortized discount or premium,
                      which approximates market values. Other assets and
                      securities for which no quotations are readily available
                      are valued at fair value as determined in good faith by
                      the Directors.
    
 
   
                      The Fund's share price can be found daily in the mutual
                      fund listings of most major newspapers under the heading
                      of Vanguard.
    
- --------------------------------------------------------------------------------
 
GENERAL
INFORMATION           The Fund is a Maryland corporation. The Articles of
                      Incorporation permit the Directors to issue 450,000,000
                      shares of common stock, with a $.10 par value. The Board
                      of Directors has the power to designate one or more
                      classes ("series") of shares of common stock and to
                      classify or reclassify any unissued shares with respect to
                      such series. Currently the Fund is offering one series of
                      shares.
 
                      The shares of the Fund are fully paid and non-assessable;
                      have no preference as to conversion, exchange, dividends,
                      retirement or other features; and have no pre-emptive
                      rights. Such shares have non-cumulative voting rights,
                      meaning that the holders of more than 50% of the shares
                      voting for the election of Directors can elect 100% of the
                      Directors if they so choose.
 
                      Annual meetings of shareholders will not be held except as
                      required by the Investment Company Act of 1940 and other
                      applicable law. An annual meeting will be held to vote on
                      the removal of a Director or Directors of the Fund if
                      requested in writing by the holders of not less than than
                      10% of the outstanding shares of the Fund.
 
   
                      All securities and cash are held by Morgan Guaranty Trust
                      Company, New York, NY. CoreStates Bank, N.A., holds daily
                      cash balances that are used by the Fund to invest in
                      repurchase agreements or securities acquired in these
                      transactions. The Vanguard Group, Inc., Valley Forge, PA,
                      serves as the Fund's Transfer and Dividend Disbursing
                      Agent. Price Waterhouse LLP serves as independent
                      accountants for the Fund and will audit its financial
                      statements annually. The Fund is not involved in any
                      litigation.
    
- --------------------------------------------------------------------------------
 
                                       13
<PAGE>   16
 
                               SHAREHOLDER GUIDE
 
   
OPENING AN
ACCOUNT AND
PURCHASING
SHARES                You may open a regular (non-retirement) account, either by
                      mail or wire. Simply complete and return an Account
                      Registration Form and any required legal documentation,
                      indicating the amount you wish to invest. Your purchase
                      must be equal to or greater than the $3,000 minimum
                      initial investment requirement ($1,000 for Uniform
                      Gifts/Transfers to Minors Act accounts). You must open a
                      new Individual Retirement Account by mail (IRAs may not be
                      opened by wire) using a Vanguard IRA Adoption Agreement.
                      Your purchase must be equal to or greater than the $1,000
                      minimum initial investment requirement, but no more than
                      $2,000 if you are making a regular IRA contribution.
                      Rollover contributions are generally limited to the amount
                      withdrawn within the past 60 days from an IRA or other
                      qualified Retirement Plan. If you need assistance with the
                      forms or have any questions about the Fund, please call
                      our Investor Information Department at 1-800-662-7447.
                      Note: For other types of account registrations (e.g.,
                      corporations, associations, other organizations, trusts or
                      powers of attorney), please call us to determine which
                      additional forms you may need.
    
 
   
                      The Fund's shares generally are purchased at the
                      next-determined net asset value after your investment has
                      been received. The Fund is offered on a no-load basis
                      (i.e., there are no sales commissions or 12b-1 fees).
    
 
   
PURCHASE
RESTRICTIONS          1) Because of the risks associated with common stock and
                         bond investments, the Fund is intended to be a
                         long-term investment vehicle and is not designed to
                         provide investors with a means of speculating on
                         short-term market movements. Consequently, the Fund
                         reserves the right to reject any specific purchase (and
                         exchange purchase) request. The Fund also reserves the
                         right to suspend the offering of shares for a period of
                         time.
    
 
   
                      2) Vanguard will not accept third-party checks to purchase
                         shares of the Fund. Please be sure your purchase check
                         is made payable to the Vanguard Group.
    
 
ADDITIONAL
INVESTMENTS           Subsequent investments to regular accounts may be made by
                      mail ($100 minimum), wire ($1,000 minimum), exchange from
                      another Vanguard Fund account ($100 minimum), or Vanguard
                      Fund Express. Subsequent investments to Individual
                      Retirement Accounts may be made by mail ($100 minimum) or
                      exchange from another Vanguard Fund account. In some
                      instances, contributions may be made by wire or Vanguard
                      Fund Express. Please call us for more information on these
                      options.
- --------------------------------------------------------------------------------
 
                                       14
<PAGE>   17
 
<TABLE>
<S>                       <C>                                       <C>
                                                                    ADDITIONAL INVESTMENTS
                          NEW ACCOUNT                               TO EXISTING ACCOUNTS

PURCHASING BY MAIL        Please include the amount of              Additional investments should
                          your initial investment on the            include the Invest-by-Mail
Complete and sign the     registration form, make your              remittance form attached to your
enclosed Account          check payable to The Vanguard             Fund confirmation statements.
Registration Form         Group-27, and mail to:                    Please make your check payable
                                                                    to The Vanguard Group-27, write
                          VANGUARD FINANCIAL CENTER                 your account number on your
                          P.O. BOX 2600                             check and, using the return
                          VALLEY FORGE, PA 19482                    envelope provided, mail to the
                                                                    address indicated on the Invest-
                                                                    by-Mail Form.

For express or            VANGUARD FINANCIAL CENTER                 All written requests should be
registered mail,          455 DEVON PARK DRIVE                      mailed to one of the addresses
send to:                  WAYNE, PA 19087                           indicated for new accounts. Do
                                                                    not send registered or express
                                                                    mail to the post office box
                                                                    address.
                          --------------------------------------------------------------------------
</TABLE>
 
PURCHASING BY WIRE

Money should be
wired to:
BEFORE WIRING

Please contact
Client Services
(1-800-662-2739)                  CORESTATES BANK, N.A.
                                  ABA 031000011
                                  CORESTATES NO. 0101 9897
                                  ATTN VANGUARD
                                  VANGUARD/WELLESLEY INCOME FUND
                                  ACCOUNT NUMBER
                                  ACCOUNT REGISTRATION
 
   
                      To assure proper receipt, please be sure your bank
                      includes the name of the Fund, the account number Vanguard
                      has assigned to you and the eight-digit CoreStates number.
                      If you are opening a new account, please complete the
                      Account Registration Form and mail it to the "New Account"
                      address above after completing your wire arrangement.
                      NOTE: Federal Funds wire purchase orders will be accepted
                      only when the Fund and Custodian Bank are open for
                      business.
    
- --------------------------------------------------------------------------------
 
PURCHASING BY
EXCHANGE (from a
Vanguard account)     You may open an account or purchase additional shares by
                      making an exchange from another Vanguard Fund account.
                      However, the Fund reserves the right to refuse any
                      exchange purchase request. Call our Client Services
                      Department toll-free (1-800-662-2739) for assistance. The
                      new account will have the same registration as the
                      existing account.
- --------------------------------------------------------------------------------
 
PURCHASING BY
FUND EXPRESS

Special Purchase and
Automatic Investment  The Fund Express Special Purchase option lets you move
                      money from your bank account to your Vanguard account on
                      an "as needed" basis. Or if you choose the Automatic
                      Investment option, money will be moved automatically from
                      your bank account to your Vanguard account on the schedule
                      (monthly, bimonthly [every other month], quarterly or
                      yearly) you select. To establish these Fund Express
                      options, please provide the appropriate information on the
                      Account Registration
 
                                       15
<PAGE>   18
 
                      Form. We will send you a confirmation of your Fund Express
                      service; please wait three weeks before using the service.
- --------------------------------------------------------------------------------
 
CHOOSING A
DISTRIBUTION
OPTION                You must select one of three distribution options:
 
                      1. AUTOMATIC REINVESTMENT OPTION -- Both dividends and
                         capital gains distributions will be reinvested in
                         additional Fund shares. This option will be selected
                         for you automatically unless you specify one of the
                         other options.
 
                      2. CASH DIVIDEND OPTION -- Your dividends will be paid in
                         cash and your capital gains will be reinvested in
                         additional Fund shares.
 
                      3. ALL CASH OPTION -- Both dividend and capital gains
                         distributions will be paid in cash.
 
                      You may change your option by calling our Client Services
                      Department (1-800-662-2739).

                      In addition, an option to invest your cash dividends
                      and/or capital gains distributions in another Vanguard
                      Fund account is available. Please call our Client Services
                      Department (1-800-662-2739) for information. You may also
                      elect Vanguard Dividend Express which allows you to
                      transfer your cash dividends and/or capital gains
                      distributions automatically to your bank account. Please
                      see "Other Vanguard Services" for more information.
- --------------------------------------------------------------------------------
 
TAX CAUTION

INVESTORS SHOULD ASK
ABOUT THE TIMING OF
CAPITAL GAINS AND
DIVIDEND DISTRIBUTIONS
BEFORE INVESTING      Under Federal tax laws, the Fund is required to distribute
                      net capital gains and dividend income to Fund
                      shareholders. These distributions are made to all
                      shareholders who own Fund shares as of the distribution's
                      record date, regardless of how long the shares have been
                      owned. Purchasing shares just prior to the record date
                      could have a significant impact on your tax liability for
                      the year. For example, if you purchase shares immediately
                      prior to the record date of a sizable capital gain or
                      income dividend distribution, you will be assessed taxes
                      on the amount of the capital gain and/or dividend
                      distribution later paid even though you owned the Fund
                      shares for just a short period of time. (Taxes are due on
                      the distributions even if the dividend or gain is
                      reinvested in additional Fund shares.) While the total
                      value of your investment will be the same after the
                      distribution -- the amount of the distribution will offset
                      the drop in the net asset value of the shares -- you
                      should be aware of the tax implications the timing of your
                      purchase may have.
 
                      Prospective investors should, therefore, inquire about
                      potential distributions before investing. The Fund's
                      annual capital gains distribution normally occurs in
                      December, while income dividends are generally paid
                      quarterly in March, June, September and December. For
                      additional information on distributions and taxes, see the
                      section titled "Dividends, Capital Gains, and Taxes."
- --------------------------------------------------------------------------------
 
                                       16
<PAGE>   19
 
IMPORTANT
INFORMATION

ESTABLISHING OPTIONAL
SERVICES              The easiest way to establish optional Vanguard services on
                      your account is to select the options you desire when you
                      complete your Account Registration Form. IF YOU WISH TO
                      ADD OPTIONS LATER, YOU MAY NEED TO PROVIDE VANGUARD WITH
                      ADDITIONAL INFORMATION AND A SIGNATURE GUARANTEE. PLEASE
                      CALL OUR CLIENT SERVICES DEPARTMENT (1-800-662-2739) FOR
                      FURTHER ASSISTANCE.
 
SIGNATURE
GUARANTEES            For our mutual protection, we may require a signature
                      guarantee on certain written transaction requests. A
                      signature guarantee verifies the authenticity of your
                      signature and may be obtained from banks, brokers and any
                      other guarantor that Vanguard deems acceptable. A
                      SIGNATURE GUARANTEE CANNOT BE PROVIDED BY A NOTARY PUBLIC.
 
CERTIFICATES
                      Share certificates will be issued upon request. If a
                      certificate is lost, you may incur an expense to replace
                      it.
 
BROKER-DEALER
PURCHASES             If you purchase shares in Vanguard Funds through a
                      registered broker-dealer or investment adviser, the
                      broker-dealer or adviser may charge a service fee.
 
CANCELLING TRADES     The Fund will not cancel any trade (e.g., a purchase,
                      exchange, or redemption) believed to be authentic,
                      received in writing or by telephone, once the trade
                      request has been received.
 
ELECTRONIC
PROSPECTUS
DELIVERY              If you would prefer to receive a prospectus for the Fund
                      or any of the Vanguard Funds in an electronic format,
                      please call 1-800-231-7870 for additional information. If
                      you elect to do so, you may also receive a paper copy of
                      the prospectus, by calling 1-800-662-7447.
- --------------------------------------------------------------------------------
 
   
WHEN YOUR
ACCOUNT WILL
BE CREDITED           Your trade date is the date on which your account is
                      credited. If your purchase is made by check, Federal Funds
                      wire or exchange, and is received by the close of the New
                      York Stock Exchange (generally 4:00 p.m. Eastern time),
                      your trade date is the day of receipt. If your purchase is
                      received after the close of the Exchange, your trade date
                      is the next business day. Your shares are purchased at the
                      net asset value determined on your trade date.
    
 
                      In order to prevent lengthy processing delays caused by
                      the clearing on foreign checks, Vanguard will only accept
                      a foreign check which has been drawn in U.S. dollars and
                      has been issued by a foreign bank with a U.S.
                      correspondent bank. The name of the U.S. correspondent
                      bank must be printed on the face of the foreign check.
- --------------------------------------------------------------------------------
 
   
SELLING YOUR
SHARES                You may withdraw any portion of the funds in your account
                      by redeeming shares at any time. You generally may
                      initiate a request by writing or by telephoning. Your
                      redemption proceeds are normally mailed within two
                      business days after the receipt of the request in Good
                      Order.
    
 
SELLING BY MAIL
                      Requests should be mailed to VANGUARD FINANCIAL CENTER,
                      VANGUARD/WELLESLEY INCOME FUND, P.O. BOX 1120, VALLEY
                      FORGE, PA 19482. (For express or registered mail, send
                      your request to Vanguard Financial Center,
                      Vanguard/Wellesley Income Fund, 455 Devon Park Drive,
                      Wayne, PA 19087.)
 
                                       17
<PAGE>   20
 
                      The redemption price of shares will be the Fund's net
                      asset value next determined after Vanguard has received
                      all required documents in Good Order.
- --------------------------------------------------------------------------------
 
DEFINITION OF
GOOD ORDER
                      GOOD ORDER means that the request includes the following:
 
                      1. The account number and Fund name.
                      2. The amount of the transaction (specified in dollars or
                         shares).
                      3. The signatures of all owners EXACTLY as they are
                         registered on the account.
                      4. Any required signature guarantees.
                      5. Other supporting legal documentation that might be
                         required, in the case of estates, corporations, trusts,
                         and certain other accounts.
                      6. Any certificates that you are holding for the account.
 
                      IF YOU HAVE QUESTIONS ABOUT THIS DEFINITION AS IT PERTAINS
                      TO YOUR ACCOUNT, PLEASE CALL OUR CLIENT SERVICES
                      DEPARTMENT (1-800-662-2739).
- --------------------------------------------------------------------------------
 
   
SELLING BY
TELEPHONE
                      To sell shares by telephone, you or your pre-authorized
                      representative may call our Client Services Department at
                      1-800-662-2739. The proceeds will be sent to you by mail.
                      PLEASE NOTE: As a protection against fraud, your telephone
                      mail redemption privilege will be suspended for 10
                      calendar days following any expedited address change to
                      your account. An expedited address change is one that is
                      made by telephone, by Vanguard Online or, in writing,
                      without the signatures of all account owners. Please see
                      "Important Information About Telephone Transactions."
    
- --------------------------------------------------------------------------------
 
SELLING BY FUND
EXPRESS

Automatic Withdrawal
& Special Redemption  If you select the Fund Express Automatic Withdrawal
                      option, money will be automatically moved from your
                      Vanguard Fund account to your bank account according to
                      the schedule you have selected. The Special Redemption
                      option lets you move money from your Vanguard account to
                      your bank account on an "as needed" basis. To establish
                      these Fund Express options, please provide the appropriate
                      information on the Account Registration Form. We will send
                      you a confirmation of your Fund Express service; please
                      wait three weeks before using the service.
- --------------------------------------------------------------------------------
 
SELLING BY
EXCHANGE              You may sell shares by making an exchange into another
                      Vanguard Fund account. Please see "Exchanging Your Shares"
                      for details.
- --------------------------------------------------------------------------------
 
IMPORTANT
REDEMPTION
INFORMATION           Shares purchased by check or Fund Express may be redeemed
                      at any time. However, your redemption proceeds will not be
                      paid until payment for the purchase is collected, which
                      may take up to ten calendar days.
- --------------------------------------------------------------------------------
 
DELIVERY OF
REDEMPTION
PROCEEDS              Redemption requests received by telephone prior to the
                      close of the New York Stock Exchange (generally 4:00 p.m.
                      Eastern time) are processed on the day of receipt and the
                      redemption proceeds are normally sent on the following
                      business day.
 
                      Redemption requests received by telephone after the close
                      of the Exchange are processed on the business day
                      following receipt and the proceeds are normally sent on
                      the second business day following receipt.
 
                                       18
<PAGE>   21
 
   
                      Redemption proceeds must be sent to you within seven days
                      of receipt of your request in Good Order, except as
                      described above in "Important Redemption Information."
    
 
                      If you experience difficulty in making a telephone
                      redemption during periods of drastic economic or market
                      changes, your redemption request may be made by regular or
                      express mail. It will be implemented at the net asset
                      value next determined after your request has been received
                      by Vanguard in Good Order. The Fund reserves the right to
                      revise or terminate the telephone redemption privilege at
                      any time.
 
                      The Fund may suspend the redemption right or postpone
                      payment at times when the New York Stock Exchange is
                      closed or under any emergency circumstances as determined
                      by the United States Securities and Exchange Commission.
 
                      If the Board of Directors determines that it would be
                      detrimental to the best interests of the Fund's remaining
                      shareholders to make payment in cash, the Fund may pay
                      redemption proceeds in whole or in part by a distribution
                      in kind of readily marketable securities.
- --------------------------------------------------------------------------------
 
   
VANGUARD'S AVERAGE
COST STATEMENT        If you make a redemption from a qualifying account,
                      Vanguard will send you an Average Cost Statement which
                      provides you with the tax basis of the shares you
                      redeemed. Please see "Statements and Reports" for
                      additional information.
    
- --------------------------------------------------------------------------------
 
   
LOW BALANCE FEE AND
MINIMUM ACCOUNT
BALANCE REQUIREMENT   Due to the relatively high cost of maintaining smaller
                      accounts, the Fund will automatically deduct a $10 annual
                      fee from non-retirement accounts with balances falling
                      below $2,500 ($1,000 for Uniform Gifts/Transfers to Minors
                      Act accounts). This fee deduction will occur mid-year,
                      beginning in 1996. The fee generally will be waived for
                      investors whose aggregate Vanguard assets exceed $50,000.
    
 
   
                      In addition, the Fund reserves the right to liquidate any
                      non-retirement account that is below the minimum initial
                      investment amount of $3,000. If at any time your total
                      investment does not have a value of at least $3,000, you
                      may be notified that your account is below the Fund's
                      minimum account balance requirement. You would then be
                      allowed 60 days to make an additional investment before
                      the account is liquidated. Proceeds would be promptly paid
                      to the registered shareholder.
    
 
   
                      Vanguard will not liquidate your account if it has fallen
                      below $3,000 solely as a result of declining markets
                      (i.e., a decline in a Fund's net asset value).
    
- --------------------------------------------------------------------------------
 
EXCHANGING YOUR
SHARES                Should your investment goals change, you may exchange your
                      shares of Wellesley Income Fund for those of other
                      available Vanguard Funds.
 
EXCHANGING BY
TELEPHONE
Call Client Services
(1-800-662-2739)      When exchanging shares by telephone, please have ready the
                      Fund name, account number, Social Security Number or
                      Employer Identification Number listed on the account and
                      exact name and address in which the account is registered.
                      Only the registered shareholder may complete such an
                      exchange. Requests for telephone exchanges received prior
                      to the close of trading on the New York Stock Exchange
                      (generally 4:00 p.m. Eastern time) are processed at the
                      close of business that same day. Requests received after
                      the close of the Exchange are processed the next
 
                                       19
<PAGE>   22
 
                      business day. TELEPHONE EXCHANGES ARE NOT ACCEPTED INTO OR
                      FROM VANGUARD BALANCED INDEX FUND, VANGUARD INDEX TRUST,
                      VANGUARD INTERNATIONAL EQUITY INDEX FUND AND VANGUARD
                      QUANTITATIVE PORTFOLIOS. If you experience difficulty in
                      making a telephone exchange, your exchange request may be
                      made by regular or express mail, and it will be
                      implemented at the closing net asset value on the date
                      received by Vanguard provided that the request is received
                      in Good Order.
- --------------------------------------------------------------------------------
 
EXCHANGING BY MAIL    Please be sure to include on your exchange request the
                      name and account number of your current Fund, the name of
                      the Fund you wish to exchange into, the amount you wish to
                      exchange, and the signatures of all registered account
                      holders. Send your request to VANGUARD FINANCIAL CENTER,
                      VANGUARD/WELLESLEY INCOME FUND, P.O. BOX 1120, VALLEY
                      FORGE, PA 19482. (For express or registered mail, send
                      your request to Vanguard Financial Center,
                      Vanguard/Wellesley Income Fund, 455 Devon Park Drive,
                      Wayne, PA 19087.)
- --------------------------------------------------------------------------------
 
IMPORTANT EXCHANGE
INFORMATION
                      Before you make an exchange, you should consider the
                      following:
 
                      - Please read the Fund's prospectus before making an
                        exchange. For a copy and for answers to any questions
                        you may have, call our Investor Information Department
                        (1-800-662-7447).
 
                      - An exchange is treated as a redemption and a purchase.
                        Therefore, you could realize a taxable gain or loss on
                        the transaction.
 
                      - Exchanges are accepted only if the registrations and the
                        Taxpayer Identification numbers of the two accounts are
                        identical.
 
                      - The shares to be exchanged must be on deposit and not
                        held in certificate form.
 
                      - New accounts are not currently accepted in
                        Vanguard/Windsor Fund or Vanguard/PRIMECAP Fund.
 
                      - The redemption price of shares redeemed by exchange is
                        the net asset value next determined after Vanguard has
                        received the required documentation in Good Order.
 
                      - When opening a new account by exchange, you must meet
                        the minimum investment requirement of the new Fund.
 
                      Every effort will be made to maintain the exchange
                      privilege. However, the Fund reserves the right to revise
                      or terminate its provisions, limit the amount of or reject
                      any exchange, as deemed necessary, at any time.
 
                      The exchange privilege is only available in states in
                      which the shares of the Fund are registered for sale. The
                      Fund's shares are currently registered for sale in all 50
                      states and the Fund intends to maintain such registration.
- --------------------------------------------------------------------------------
 
EXCHANGE
PRIVILEGE
LIMITATIONS           The Fund's exchange privilege is not intended to afford
                      shareholders a way to speculate on short-term movements in
                      the market. Accordingly, in order to prevent excessive use
                      of the exchange privilege that may potentially disrupt the
                      manage-
 
                                       20
<PAGE>   23
 
                      ment of the Fund and increase transaction costs, the Fund
                      has established a policy of limiting excessive exchange
                      activity.
 
   
                      Exchange activity generally will not be deemed excessive
                      if limited to TWO SUBSTANTIVE EXCHANGE REDEMPTIONS (AT
                      LEAST 30 DAYS APART) from the Fund during any
                      twelve-month period. Notwithstanding these limitations,
                      the Fund reserves the right to reject any purchase
                      request (including exchange purchases from other Vanguard
                      portfolios) that is reasonably deemed to be disruptive to
                      efficient portfolio management.
    
- --------------------------------------------------------------------------------
 
IMPORTANT
INFORMATION
ABOUT
TELEPHONE
TRANSACTIONS          The ability to initiate redemptions (except wire
                      redemptions) and exchanges by telephone is automatically
                      established on your account unless you request in writing
                      that telephone transactions on your account not be
                      permitted.
 
                      To protect your account from losses resulting from
                      unauthorized or fraudulent telephone instructions,
                      Vanguard adheres to the following security procedures:
 
                      1. SECURITY CHECK.  To request a transaction by telephone,
                         the caller must know (i) the name of the Portfolio;
                         (ii) the 10-digit account number; (iii) the exact name
                         and address used in the registration; and (iv) the
                         Social Security or Employer Identification number
                         listed on the account.
 
                      2. PAYMENT POLICY.  The proceeds of any telephone
                         redemption by mail will be made payable to the
                         registered shareowner and mailed to the address of
                         record, only.
 
   
                      Neither the Fund nor Vanguard will be responsible for the
                      authenticity of transaction instructions received by
                      telephone, provided that reasonable security procedures
                      have been followed. Vanguard believes that the security
                      procedures described above are reasonable, and that if
                      such procedures are followed, you will bear the risk of
                      any losses resulting from unauthorized or fraudulent
                      telephone transactions on your account. If Vanguard fails
                      to follow reasonable security procedures, it may be liable
                      for any losses resulting from unauthorized or fraudulent
                      telephone transactions on your account.
    
- --------------------------------------------------------------------------------
 
TRANSFERRING
REGISTRATION          You may transfer the registration of any of your Fund
                      shares to another person by completing a transfer form and
                      sending it to: VANGUARD FINANCIAL CENTER, P.O. BOX 1110,
                      VALLEY FORGE, PA 19482 ATTENTION: TRANSFER DEPARTMENT. The
                      request must be in Good Order. To obtain a transfer form
                      and complete instructions, please call our Client Services
                      Department (1-800-662-2739).
- --------------------------------------------------------------------------------
 
STATEMENTS AND
REPORTS               Vanguard will send you a confirmation statement each time
                      you initiate a transaction in your account except for
                      checkwriting redemptions from Vanguard money market
                      accounts. You will also receive a comprehensive account
                      statement at the end of each calendar quarter. The
                      fourth-quarter statement will be a year-end statement,
                      listing all transaction activity for the entire calendar
                      year.
 
                      Vanguard's Average Cost Statement provides you with the
                      average cost of shares redeemed from your account, using
                      the average cost single category method. This
 
                                       21
<PAGE>   24
 
   
                      service is available for most taxable accounts opened
                      since January 1, 1986. In general, investors who redeemed
                      shares from a qualifying Vanguard account may expect to
                      receive their Average Cost Statement with their Fund
                      Summary Statement. Please call our Client Services
                      Department (1-800-662-2739) for information.
    
 
   
                      Financial reports on the Fund will be mailed to you
                      semiannually, according to the Fund's fiscal year-end.
    
- --------------------------------------------------------------------------------
 
OTHER VANGUARD
SERVICES              For more information about any of these services, please
                      call our Investor Information Department at
                      1-800-662-7447.
 
VANGUARD DIRECT
DEPOSIT SERVICE
                      With Vanguard's Direct Deposit Service, most U.S.
                      Government checks (including Social Security and military
                      pension checks) and private payroll checks may be
                      automatically deposited into your Vanguard Fund account.
                      Separate brochures and forms are available for direct
                      deposit of U.S. Government and private payroll checks.
 
VANGUARD AUTOMATIC
EXCHANGE SERVICE      Vanguard's Automatic Exchange Service allows you to move
                      money automatically among your Vanguard Fund accounts. For
                      instance, the service can be used to "dollar cost average"
                      from a money market portfolio into a stock or bond fund or
                      to contribute to an IRA or other retirement plan. Please
                      contact our Client Services Department at 1-800-662-2739
                      for additional information.
 
VANGUARD FUND
EXPRESS
                      Vanguard's Fund Express allows you to transfer money
                      between your Fund account and your account at a bank,
                      savings and loan association, or a credit union that is a
                      member of the Automated Clearing House (ACH) system. You
                      may elect this service on the Account Registration Form or
                      call our Investor Information Department (1-800-662-7447)
                      for a Fund Express application.
 
   
                      Special rules govern how your Fund Express purchases or
                      redemptions are credited to your account. In addition,
                      some services of Fund Express cannot be used with specific
                      Vanguard Funds. For more information, please refer to the
                      Vanguard Fund Express brochure.
    
 
   
VANGUARD DIVIDEND
EXPRESS
                      Vanguard's Dividend Express allows you to transfer your
                      dividends and/or capital gains distributions automatically
                      from your Fund account, one business day after the Fund's
                      payable date, to your account at a bank, savings and loan
                      association, or a credit union that is a member of the
                      Automated Clearing House (ACH) system. You may elect this
                      service on the Account Registration Form or call our
                      Investor Information Department (1-800-662-7447) for a
                      Vanguard Dividend Express application.
    
 
VANGUARD
TELE-ACCOUNT          Vanguard's Tele-Account is a convenient, automated service
                      that provides share price, price change and yield
                      quotations on Vanguard Funds through any TouchTone(TM)
                      telephone. This service also lets you obtain information
                      about your account balance, your last transaction, and
                      your most recent dividend or capital gains payment. To
                      contact Vanguard's Tele-Account service, dial
                      1-800-ON-BOARD (1-800-662-6273). A brochure offering
                      detailed operating instructions is available from our
                      Investor Information Department (1-800-662-7447).
- --------------------------------------------------------------------------------
 
                                       22
<PAGE>   25
 
                     (THIS PAGE INTENTIONALLY LEFT BLANK.)
<PAGE>   26
 
   
                                  [VANGUARD WELLESLEY
                                   INCOME FUND LOGO]
                                 ---------------------------------     
                                 THE VANGUARD GROUP
                                   OF INVESTMENT                         
                                   COMPANIES                             
                                 Vanguard Financial Center
                                 P.O. Box 2600
                                 Valley Forge, PA 19482
    
                                 INVESTOR INFORMATION
                                   DEPARTMENT:
                                 1-800-662-7447 (SHIP)

                                 CLIENT SERVICES
                                   DEPARTMENT:
                                 1-800-662-2739 (CREW)

                                 TELE-ACCOUNT FOR
                                   24-HOUR ACCESS:
                                 1-800-662-6273 (ON-BOARD)

                                 TELECOMMUNICATION SERVICE
                                   FOR THE HEARING-IMPAIRED:
                                 1-800-662-2738

                                 TRANSFER AGENT:
                                 The Vanguard Group, Inc.
                                 Vanguard Financial Center
                                 Valley Forge, PA 19482


        P027 
                                                    [FLAG LOGO]

                                                    [VANGUARD WELLESLEY
                                                     INCOME FUND LOGO]  

                                                    P R O S P E C T U S
                                                                 
                                                    APRIL 23, 1996

                                                    [THE VANGUARD GROUP LOGO]

- --------------------------------------------------------------------------------
  
<PAGE>   27
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                                                      WELLESLEY INCOME FUND LOGO
                                                  A Member of The Vanguard Group
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 

    
   
PROSPECTUS -- APRIL 23, 1996
    
- --------------------------------------------------------------------------------
 
FUND INFORMATION: PARTICIPANT SERVICES -- 1-800-523-1188
- --------------------------------------------------------------------------------
 
INVESTMENT
OBJECTIVES &
POLICIES              Vanguard/Wellesley Income Fund, Inc. (the "Fund") is an
                      open-end diversified investment company that seeks to
                      provide as much current income as is consistent with
                      reasonable risk. The Fund also offers the potential for
                      moderate growth of capital. The Fund invests primarily in
                      U.S. Government and corporate fixed-income securities of
                      investment grade quality and dividend-paying common
                      stocks. There is no assurance that the Fund will achieve
                      its stated objectives. Shares of the Fund are neither
                      insured nor guaranteed by any agency of the U.S.
                      Government, including the FDIC.
- --------------------------------------------------------------------------------
 
IMPORTANT NOTE        This Prospectus is intended exclusively for participants
                      in employer-sponsored retirement or savings plans, such as
                      tax-qualified pension and profit-sharing plans and 401(k)
                      thrift plans, as well as 403(b) custodial accounts for
                      non-profit educational and charitable organizations.
                      Another version of this Prospectus, containing information
                      on how to open a personal investment account with the
                      Fund, is available for individual investors. To obtain a
                      copy of that version of the Prospectus, please call
                      1-800-662-7447.
- --------------------------------------------------------------------------------
 
OPENING AN
ACCOUNT               The Fund is an investment option under a retirement or
                      savings program sponsored by your employer. The
                      administrator of your retirement plan or your employee
                      benefits office can provide you with detailed information
                      on how to participate in your plan and how to elect the
                      Fund as an investment option.
 
                      If you have any questions about the Fund, please contact
                      Participant Services at 1-800-523-1188. If you have any
                      questions about your plan account, contact your plan
                      administrator or the organization that provides
                      recordkeeping services for your plan.
- --------------------------------------------------------------------------------
 
   
ABOUT THIS
PROSPECTUS            This Prospectus is designed to set forth concisely the
                      information you should know about the Fund before you
                      invest. It should be retained for future reference. A
                      "Statement of Additional Information" containing
                      additional information about the Fund has been filed with
                      the Securities and Exchange Commission. This Statement is
                      dated April 23, 1996 and has been incorporated by
                      reference into this Prospectus. A copy may be obtained
                      without charge by writing to the Fund or by calling
                      Participant Services at 1-800-523-1188.
    
- --------------------------------------------------------------------------------
 
TABLE OF CONTENTS
 
   
<TABLE>
<S>                                        <C>                                        <C>
                                 Page                                       Page                                       Page
Fund Expenses ...................   2      Investment Risks .................  5      Performance Record ............... 11
Financial Highlights ...............2      Who Should Invest ................  6      Dividends, Capital Gains
Yield and Total Return .............3      Implementation of Policies .........6      and Taxes ........................ 11
        FUND INFORMATION                   Investment Limitations ............ 8      The Share Price of the Fund ...... 11
Investment Objectives ............. 4      Management of the Fund ...........  8      General Information ...............12
Investment Policies ............... 4      Investment Adviser ...............  9      Service Guide .....................13      
</TABLE>
    
 
- --------------------------------------------------------------------------------
 
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 COMMISSION PASSED UPON THE ACCURACY OR
ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE.
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------

<PAGE>   28
 
   
FUND EXPENSES         The following table illustrates ALL expenses and fees that
                      a shareholder of the Fund would incur. The expenses and
                      fees set forth below are for the 1995 fiscal year.
    
 
   
<TABLE>
                           <S>                                                                <C>       <C>
                                                    SHAREHOLDER TRANSACTION EXPENSES
                           -----------------------------------------------------------------------------------
                           Sales Load Imposed on Purchases...............................                None
                           Sales Load Imposed on Reinvested Dividends....................                None
                           Redemption Fees...............................................                None
                           Exchange Fees.................................................                None
                                                     ANNUAL FUND OPERATING EXPENSES
                           -----------------------------------------------------------------------------------
                           Management & Administrative Expenses..........................                0.24%
                           Investment Advisory Fees......................................                0.07
                           12b-1 Fees....................................................                None
                           Other Expenses
                             Distribution Costs..........................................     0.02%
                             Miscellaneous Expenses......................................     0.02
                                                                                              ----
                           Total Other Expenses..........................................                0.04
                                                                                                        ------
                                    TOTAL OPERATING EXPENSES.............................                0.35%
                                                                                                        ------
                                                                                                        ------
</TABLE>
    
 
                      The purpose of this table is to assist you in
                      understanding the various costs and expenses that an
                      investor would bear directly or indirectly as a
                      shareholder in the Fund.
 
                      The following example illustrates the expenses that you
                      would incur on a $1,000 investment over various periods,
                      assuming (1) a 5% annual rate of return and (2) redemption
                      at the end of each period. As noted in the table above,
                      the Fund charges no redemption fees of any kind.
 
   
<TABLE>
<CAPTION>
                                1 YEAR
                                ------       3 YEARS       5 YEARS       10 YEARS
                                             -------       -------       --------
                                <S>          <C>           <C>           <C>
                                  $4          $  11         $  20          $ 44
</TABLE>
    
 
                      THIS EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF
                      PAST OR FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES
                      MAY BE HIGHER OR LOWER THAN THOSE SHOWN.
- --------------------------------------------------------------------------------
 
   
FINANCIAL
HIGHLIGHTS            The following financial highlights for a share outstanding
                      throughout each period, insofar as they relate to each of
                      the five years in the period ended December 31, 1995, have
                      been audited by Price Waterhouse LLP, independent
                      accountants, whose report thereon was unqualified. This
                      information should be read in conjunction with the Fund's
                      financial statements and notes thereto, which, together
                      with the remaining portions of the Fund's 1995 Annual
                      Report to Shareholders, are incorporated by reference in
                      the Statement of Additional Information and in this
                      Prospectus, and which appear, along with the report of
                      Price Waterhouse LLP, in the Fund's 1995 Annual Report to
                      the Shareholders. For a more complete discussion of the
                      Fund's performance, please see the Fund's 1995 Annual
                      Report to Shareholders which may be obtained without
                      charge by writing to the Fund or by calling Participant
                      Services at 1-800-523-1188.
    
 
                                        2
<PAGE>   29
 
   
<TABLE>
<CAPTION>
                                                                YEAR ENDED DECEMBER 31,
                             ---------------------------------------------------------------------------------------------------
                        1995       1994       1993       1992       1991       1990       1989       1988       1987       1986
<S>                    <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
- --------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
  BEGINNING OF
  YEAR...............  $17.05     $19.24     $18.16     $18.08     $16.02     $16.82     $15.26     $14.57     $16.27     $ 15.31
                       ------     ------     ------     ------     ------     ------     ------     ------     ------     -------
INVESTMENT OPERATIONS
  Net Investment
    Income...........    1.13       1.11       1.14       1.21       1.27       1.30       1.32       1.23       1.24        1.33
  Net Realized and
    Unrealized Gain
    (Loss) on
    Investments......    3.68      (1.95)      1.48        .29       2.06       (.72)      1.79        .69      (1.52)       1.43
                       ------     ------     ------     ------     ------     ------     ------     ------     ------      ------
    TOTAL FROM
      INVESTMENT
      OPERATIONS.....    4.81       (.84)      2.62       1.50       3.33        .58       3.11       1.92       (.28)       2.76
- ---------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net
    Investment
    Income...........   (1.14)     (1.11)     (1.14)     (1.21)     (1.27)     (1.30)     (1.31)     (1.23)     (1.04)     (1.33)
  Distributions from
    Realized Capital
    Gains............    (.28)      (.24)      (.40)      (.21)        --       (.08)      (.24)        --       (.38)      (.47)
                       ------     ------     ------     ------     ------     ------     ------     ------     ------      ------
    TOTAL
     DISTRIBUTIONS...   (1.42)     (1.35)     (1.54)     (1.42)     (1.27)     (1.38)     (1.55)     (1.23)     (1.42)     (1.80)
- ---------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
  END OF YEAR........  $20.44     $17.05     $19.24     $18.16     $18.08     $16.02     $16.82     $15.26     $14.57     $ 16.27
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
TOTAL RETURN.........   28.91%     (4.44)%    14.65%      8.67%     21.57%      3.76%     20.93%     13.61%     (1.92)%    18.34%
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL
  DATA
Net Assets, End of
  Year (Millions)....  $7,181     $5,681     $6,011     $3,178     $1,934     $1,022       $788       $567       $495        $510
Ratio of Expenses to
  Average Net
  Assets.............     .35%+      .34%       .33%       .35%       .40%       .45%       .45%       .51%       .49%       .58%
Ratio of Net
  Investment Income
  to Average Net
  Assets.............    5.96%      6.16%      5.79%      6.50%      7.08%      7.77%      7.68%      8.14%      7.83%      7.74%
Portfolio Turnover
  Rates:
  Common Stocks......      27%        32%        26%        16%        19%        12%        10%        19%        27%        18%
  Bonds..............      32%        31%        18%        24%        34%        23%        11%        21%        48%        39%
</TABLE>
    
 
   
+Effective in 1995, does not include reductions from directed brokerage
 arrangements. The 1995 Ratio of Expenses to Average Net Assets is .34% after
 including those reductions.
    
- --------------------------------------------------------------------------------
 
YIELD AND TOTAL
RETURN                From time to time the Fund may advertise its yield and
                      total return. Both yield and total return figures are
                      based on historical earnings and are not intended to
                      indicate future performance. The "total return" of the
                      Fund refers to the average annual compounded rates of
                      return over one-, five-and ten-year periods or for the
                      life of the Fund (as stated in the advertisement) that
                      would equate an initial amount invested at the beginning
                      of a stated period to the ending redeemable value of the
                      investment, assuming the reinvestment of all dividend and
                      capital gains distributions.
 
                      In accordance with industry guidelines set forth by the
                      U.S. Securities and Exchange Commission, the "30-day
                      yield" of the Fund is calculated by dividing net
                      investment income per share earned during a 30-day period
                      by the net asset value per share on the last day of the
                      period. Net investment income includes interest and
                      dividend income earned on the Fund's securities; it is net
                      of all expenses and all recurring and nonrecurring charges
                      that have been applied to all shareholder
 
                                        3
<PAGE>   30
 
   
                      accounts. The yield calculation assumes that net
                      investment income earned over 30 days is compounded
                      monthly for six months and then annualized. Methods used
                      to calculate advertised yields are standardized for all
                      stock and bond mutual funds. However, these methods differ
                      from the accounting methods used by the Fund to maintain
                      its books and records, and so the advertised 30-day yield
                      may not fully reflect the income paid to an investor's
                      account.
    
- --------------------------------------------------------------------------------
 
   
INVESTMENT            The Fund is an open-end diversified investment company.
OBJECTIVES            The objective of the Fund is to provide as much current
                      income as is consistent with reasonable risk. The Fund
THE FUND SEEKS TO     also offers the potential for moderate growth of capital.
PROVIDE CURRENT       The Fund invests primarily in U.S. Government and
INCOME AND MODERATE   corporate fixed-income securities of investment grade
CAPITAL GROWTH        quality and dividend-paying common stocks.

    
                      There is no assurance that the Fund will achieve its
                      stated objectives.  
- --------------------------------------------------------------------------------
 
   
INVESTMENT            The Fund invests in fixed-income securities and
POLICIES              dividend-paying common stocks. Under normal
                      circumstances, it is expected that fixed-income
THE FUND INVESTS IN   securities will represent approximately 60% of the Fund's
BONDS AND COMMON      net assets. The remainder of the Fund's assets will be
STOCKS                invested primarily in common stocks chosen largely for
                      their income characteristics.
    
 
   
                      The fixed-income securities owned by the Fund will include
                      U.S. Government and corporate bonds and mortgage-backed
                      securities (such as Government National Mortgage
                      Association pass-through certificates), asset-backed
                      securities, U.S. dollar-denominated debt securities issued
                      by foreign governments, their agencies and
                      instrumentalities, supranational entities and companies
                      located outside the U.S., as well as bonds or preferred
                      stocks which are convertible into common stock.
                      Fixed-income securities will be primarily of investment
                      grade quality -- i.e., those rated at least Baa by Moody's
                      Investors Service, Inc. or BBB by Standard & Poor's
                      Corporation. Securities rated Baa or BBB are considered as
                      medium grade obligations. Interest and principal payments
                      for such bonds are regarded as adequate for the present
                      but certain protective elements found in higher-rated
                      bonds may be lacking. Such bonds lack outstanding
                      investment characteristics and, in fact, have speculative
                      characteristics as well.
    
 
                      The mix of bonds and stocks held by the Fund may be varied
                      from time to time depending on the investment adviser's
                      assessment of business, economic and investment
                      conditions. However, fixed-income securities can be
                      expected to represent the majority of the Fund's assets so
                      long as the general level of interest rates remains well
                      in excess of dividend yields available on common stocks.
 
                      In addition to investing in fixed-income securities and
                      dividend-paying common stocks, the Fund may also invest in
                      certain short-term fixed-income securities as cash
                      reserves. The Fund is also authorized to invest in stock
                      and bond futures contracts and options to a limited
                      extent. See "Implementation of Policies" for a description
                      of these and other investment practices of the Fund.
 
   
                      The Fund is responsible for voting the shares of all
                      securities it holds.
    
 
                                        4
<PAGE>   31
 
                      The investment objectives and policies of the Fund are not
                      fundamental and so may be changed by the Board of
                      Directors without shareholder approval. However,
                      shareholders would be notified prior to a material change
                      in either.
- --------------------------------------------------------------------------------
 
INVESTMENT RISKS
THE FUND IS SUBJECT
TO INTEREST RATE AND
STOCK MARKET RISK
                      Like any investment program, the Fund entails certain
                      risks. The Fund is subject to the risk that bond or stock
                      prices will decline during short or even extended periods.
 
   
                      The Fund is expected to invest the majority of its assets
                      (63% as of December 31, 1995) in longer-term fixed-income
                      securities, such as government and corporate bonds. Bond
                      prices are influenced primarily by changes in the level of
                      interest rates. When interest rates rise, bond prices
                      generally fall; conversely, when interest rates fall, bond
                      prices generally rise. While bonds normally fluctuate less
                      than stocks, there have been extended periods of increases
                      in interest rates that have caused significant price
                      declines. For example, long-term U.S. government bonds
                      prices fell 48% from December 1976 to September 1981. The
                      risk of bond holdings declining in value, however, may be
                      offset in whole or in part by the high level of income
                      that bonds provide.
    
 
   
                      A smaller portion of the Fund's assets will be invested in
                      stocks (37% of assets as of December 31, 1995). The stock
                      market tends to be cyclical, with periods when stock
                      prices generally rise and periods when stock prices
                      generally decline. Common stocks have provided annual
                      total returns (capital appreciation plus dividend income)
                      averaging +10.7% for all 10-year periods from 1926 to
                      1995. This level of return can be used as a guide for
                      setting reasonable expectations for future stock market
                      returns, but may not be useful for forecasting future
                      returns in any particular period, as stock returns are
                      quite volatile from year to year. For example, in the
                      period from 1926 to 1995, the range of annual returns on
                      the S&P 500 Index was +53.9% to -43.3%. Over longer-term
                      holding periods, stocks tend to be less volatile. For
                      five-year periods since 1926, the annualized rates of
                      return for the S&P 500 Index ranged from +23.9% to -12.5%.
    
 
                      In large part, the common stocks held by the Fund will be
                      selected for their current income and potential growth in
                      income. The aggregate characteristics of such stocks will
                      tend to be quite different from those exhibited by the S&P
                      500 Index. As a result, investors should anticipate that
                      the common stocks in the Fund may perform differently than
                      those in the Index.
 
   
                      From time to time, the stock and bond markets may
                      fluctuate independently of one another. In other words, a
                      decline in the stock market may be offset by a rise in the
                      bond market, or vice versa. As a result, the Fund with its
                      balance of common stock and bond investments, is expected
                      to entail less investment risk (and a potentially lower
                      return) than a mutual fund investing exclusively in common
                      stocks.
    
 
   
                      From the Fund's inception on July 1, 1970 to December 31,
                      1995, the Fund has provided an average annual return of
                      +11.6%. During this period, the Fund has experienced 21
                      years of positive returns and four years of negative
                      returns. Annual returns have ranged from +28.9% to -6.4%.
                      These return characteristics are provided to illustrate
                      the risks and returns that the Fund has provided in the
                      past and may not be indicative of future results.
    
- --------------------------------------------------------------------------------
 
                                        5
<PAGE>   32
 
   
WHO SHOULD INVEST
INVESTORS SEEKING A
CURRENT INCOME OR
A CONSERVATIVE "TOTAL
RETURN" INVESTMENT    The Fund is designed for investors seeking a high level of
                      current income from a portfolio of bonds and stocks.
                      Because of the risks associated with common stock and bond
                      investments, the Fund is intended to be a long-term
                      investment vehicle and is not designed to provide
                      investors with a means of speculating on short-term stock
                      and/or bond market movements. Investors who engage in
                      excessive account activity generate additional costs which
                      are borne by all of the Fund's shareholders. In order to
                      minimize such costs, the Fund has adopted the following
                      policies. The Fund reserves the right to reject any
                      purchase request (including exchange purchases from other
                      Vanguard portfolios) that is reasonably deemed to be
                      disruptive to efficient portfolio management, either
                      because of the timing of the investment or previous
                      excessive trading by the investor. Additionally, the Fund
                      reserves the right to suspend the offering of its shares.
                      Although capital appreciation is not a primary objective
                      of the Fund, the Fund's investment in common stocks may
                      provide modest growth in income and capital over time.
                      Thus, the Fund is also suitable for conservative "total
                      return" investors who seek to build capital gradually,
                      through moderate appreciation and the compounding of
                      income.
    
 
                      Because of the inevitable fluctuations in bond and stock
                      prices, the share price of the Fund is expected to
                      fluctuate, sometimes substantially. Investors should be
                      able to tolerate such fluctuations in the value of their
                      investment in pursuit of the current income and moderate
                      growth that the Fund may provide. Investors may wish to
                      reduce the potential risk of investing in the Fund by
                      purchasing shares on a regular, periodic basis
                      (dollar-cost averaging) rather than making an investment
                      in one lump sum.
- --------------------------------------------------------------------------------
 
IMPLEMENTATION OF
POLICIES
                      In addition to investing primarily in fixed-income
                      securities and dividend-paying common stocks, the Fund
                      follows a number of additional investment practices to
                      achieve its objectives.
 
   
THE FUND MAY INVEST
IN SHORT-TERM FIXED
INCOME SECURITIES     The Fund may invest temporarily in certain short-term
                      fixed income securities. Such securities may be used to
                      invest uncommitted cash balances, to maintain liquidity to
                      meet shareholder redemptions, or to take a temporary
                      defensive position against potential stock market
                      declines. These securities include: obligations of the
                      United States Government and its agencies or
                      instrumentalities; commercial paper, bank certificates of
                      deposit, and bankers' acceptances; and repurchase
                      agreements collateralized by these securities.
    
 
   
THE FUND MAY INVEST
IN SECURITIES OF FOREIGN
ISSUERS
                      The Fund may invest up to 15% of its equity assets in
                      foreign common stocks and securities convertible into
                      foreign common stocks, and may engage in currency
                      transactions with respect to these investments. The Fund
                      may also invest in fixed income securities of foreign
                      issuers, but all such securities must be denominated in
                      U.S. dollars and must meet the Fund's credit quality
                      standards. Securities of foreign issuers may trade in U.S.
                      or foreign securities markets. Securities of foreign
                      issuers may involve investment risks that are different
                      from those of domestic issuers. Such risks include the
                      effect of foreign economic policies and conditions, future
                      political and economic developments, and the possible
                      imposition of exchange controls or other foreign
                      governmental restrictions on foreign issuers. There may
                      also be less
    
 
                                        6
<PAGE>   33
 
   
                      publicly available information about a foreign issuer than
                      a domestic issuer of securities. Foreign issuers are
                      generally not subject to the uniform accounting, auditing
                      and financial reporting standards that apply to domestic
                      issuers. Also, foreign markets may be characterized by
                      lower liquidity, greater price volatility, and higher
                      transactions costs. Additionally, it may be difficult to
                      obtain or enforce a legal judgment in a foreign court.
    
 
   
THE FUND MAY LEND ITS
SECURITIES
                      The Fund may lend its investment securities to qualified
                      institutional investors for the short-term or long-term
                      purpose of realizing additional income. Loans of
                      securities by the Fund will be collateralized by cash,
                      letters of credit, or securities issued or guaranteed by
                      the U.S. Government or its agencies. The collateral will
                      equal at least 100% of the current market value of the
                      loaned securities.
    
 
PORTFOLIO TURNOVER IS
NOT EXPECTED TO
EXCEED 40%
                      Although it generally seeks to invest for the long term,
                      the Fund retains the right to sell securities irrespective
                      of how long they have been held. It is anticipated that
                      the annual portfolio turnover of the Fund will not exceed
                      40%. A turnover rate of 40% would occur, for example, if
                      four-tenths of the securities of the Fund were replaced
                      within one year.
 
   
DERIVATIVE
INVESTING
                      Derivatives are instruments whose values are linked to or
                      derived from an underlying security or index. The most
                      common and conventional types of derivative securities are
                      futures and options.
    
 
   
THE FUND MAY
INVEST IN DERIVATIVE
SECURITIES
                      The Fund may invest in futures contracts and options, but
                      only to a limited extent. Specifically, the Fund may enter
                      into futures contracts provided that not more than 5% of
                      its assets are required as a futures contract deposit; in
                      addition, the Fund may enter into futures contracts and
                      options transactions only to the extent that obligations
                      under such contracts or transactions represent not more
                      than 20% of the Fund's assets.
    
 
   
                      Futures contracts and options may be used for several
                      common fund management strategies: to maintain cash
                      reserves while simulating full investment, to facilitate
                      trading, to reduce transaction costs, or to seek higher
                      investment returns when a specific futures contract is
                      priced more attractively than other futures contracts or
                      the underlying security or index.
    
 
   
                      The Fund may use futures contracts for bona fide "hedging"
                      purposes. In executing a hedge, a manager sells, for
                      example, stock index futures to protect against a decline
                      in the stock market. As such, if the market drops, the
                      value of the futures position will rise, thereby
                      offsetting the decline in value of the Fund's stock
                      holdings.
    
 
   
THE FUND MAY
INVEST IN CMOS        The Fund may also invest modestly in a fairly conservative
                      class of collateralized mortgage obligations (CMOs) which
                      feature a high degree of cash flow predictability and
                      moderate vulnerability to mortgage prepayment risk. To
                      reduce credit risk, Vanguard purchases these less risky
                      classes of collateralized mortgage obligations issued only
                      by agencies of the U.S. Government or privately-issued
                      collateralized mortgage obligations that carry
                      high-quality investment-grade ratings.
    
 
                                        7
<PAGE>   34
 
   
FUTURES CONTRACTS
AND OPTIONS POSE
CERTAIN RISKS
                      The primary risks associated with the use of futures
                      contracts and options are: (i) imperfect correlation
                      between the change in market value of the stocks or bonds
                      held by the Fund and the prices of futures contracts and
                      options; and (ii) possible lack of a liquid secondary
                      market for a futures contract and the resulting inability
                      to close a futures position prior to its maturity date.
                      The risk of imperfect correlation will be minimized by
                      investing in those contracts whose price fluctuations are
                      expected to resemble those of the Fund's underlying
                      securities. The risk that the Fund will be unable to close
                      out a futures position will be minimized by entering into
                      such transactions on a national exchange with an active
                      and liquid secondary market.
    
 
   
                      The risk of loss in trading futures contracts in some
                      strategies can be substantial, due both to the low margin
                      deposits required and the extremely high degree of
                      leverage involved in futures pricing. As a result, a
                      relatively small price movement in a futures contract may
                      result in immediate and substantial loss (or gain) to the
                      investor. When investing in futures contracts, the Fund
                      will segregate cash or cash equivalents in the amount of
                      the underlying obligation.
    
- --------------------------------------------------------------------------------
 
INVESTMENT
LIMITATIONS           The Fund has adopted certain limitations on its investment
                      practices. Specifically, the Fund will not:
 
THE FUND HAS ADOPTED
CERTAIN FUNDAMENTAL
LIMITATIONS
                      (a) invest more than 25% of its assets in any one
                          industry;
 
                      (b) with respect to 75% of the value of its total assets,
                          purchase the securities of any issuer (except
                          obligations of the United States government and its
                          instrumentalities) if as a result the Fund would hold
                          more than 10% of the outstanding voting securities of
                          the issuer, or more than 5% of the value of the Fund's
                          total assets would be invested in the securities of
                          such issuer;
 
                      (c)  borrow money, except that the Fund may borrow from
                           banks (or through reverse repurchase agreements), for
                           temporary or emergency (not leveraging) purposes,
                           including the meeting of redemption requests which
                           might otherwise require the untimely disposition of
                           securities, in an amount not exceeding 10% of the
                           value of the Fund's net assets (including the amount
                           borrowed and the value of any outstanding reverse
                           repurchase agreements) at the time the borrowing is
                           made. Whenever borrowings exceed 5% of the value of
                           the Fund's net assets, the Fund will not make any
                           additional investments.
 
   
                      These investment limitations are considered at the time
                      investment securities are purchased. The investment
                      limitations described here and in the Statement of
                      Additional Information are fundamental and may be changed
                      only with the approval of a majority of the Fund's
                      shareholders.
    
- --------------------------------------------------------------------------------
 
   
MANAGEMENT
OF THE FUND
VANGUARD
ADMINISTERS AND
DISTRIBUTES THE
FUND
                      The Fund is a member of The Vanguard Group of Investment
                      Companies, a family of more than 30 investment companies
                      with more than 90 distinct investment portfolios and total
                      assets in excess of $190 billion. Through their
                      jointly-owned subsidiary, The Vanguard Group, Inc.
                      ("Vanguard"), the Fund and the other funds in the Group
                      obtain at cost virtually all of their corporate
                      management, administrative and distribution services.
                      Vanguard also provides investment advisory services on an
                      at-cost basis to certain Vanguard funds. As a result of
                      Vanguard's unique
    
 
                                        8
<PAGE>   35
 
   
                      corporate structure, the Vanguard funds have costs
                      substantially lower than those of most competing mutual
                      funds. In 1995, the average expense ratio (annual costs
                      including advisory fees divided by total net assets) for
                      the Vanguard funds amounted to approximately .31% compared
                      to an average of 1.11% for the mutual fund industry (data
                      provided by Lipper Analytical Services).
    
 
                      The Officers of the Fund manage its day-to-day operations
                      and are responsible to the Fund's Board of Directors. The
                      Directors set broad policies for the Fund and choose its
                      Officers. A list of the Directors and Officers of the Fund
                      and a statement of their present positions and principal
                      occupations during the past five years can be found in the
                      Statement of Additional Information.
 
   
                      Vanguard employs a supporting staff of management and
                      administrative personnel to provide the requisite services
                      to the funds and also furnishes the funds with necessary
                      office space, furnishings and equipment. Each fund pays
                      its share of Vanguard's net expenses, which are allocated
                      among the funds under methods approved by the Board of
                      Directors (Trustees) of each fund. In addition, each fund
                      bears its own direct expenses, such as legal, auditing and
                      custodian fees.
    
 
                      Vanguard provides distribution and marketing services to
                      the funds. The funds are available on a no-load basis
                      (i.e., there are no sales commissions or 12b-1 fees).
                      However, each fund bears its share of the Group's
                      distribution costs.
- --------------------------------------------------------------------------------
 
INVESTMENT
ADVISER
WELLINGTON
MANAGEMENT
COMPANY SERVES AS
ADVISER TO THE FUND   The Fund has entered into an investment advisory agreement
                      with Wellington Management Company ("WMC"), 75 State
                      Street, Boston, MA 02109, under which WMC manages the
                      investment and reinvestment of the Fund's assets and
                      continuously reviews, supervises and administers the
                      Fund's investment program. WMC discharges its
                      responsibility subject to the control of the Officers and
                      Directors of the Fund.
 
   
                      WMC is a professional investment advisory firm which
                      globally provides investment services to investment
                      companies, institutions and individuals. Among the clients
                      of WMC are more than 10 of the investment companies of The
                      Vanguard Group. As of December 31, 1995, WMC held
                      discretionary management authority with respect to more
                      than $108 billion of assets. WMC and its predecessor
                      organizations have provided investment advisory services
                      to investment companies since 1933 and to investment
                      counseling clients since 1960.
    
 
   
                      Earl E. McEvoy, Senior Vice President of WMC, serves as
                      portfolio manager of the Fund, a position he has held
                      since October 1982. Mr. McEvoy is assisted by John R.
                      Ryan, Senior Vice President and a managing partner of WMC,
                      who has managed the Fund's equity investments since
                      January 1986. Messrs. McEvoy and Ryan are supported by
                      research and other investment services provided by the
                      professional staff of WMC.
    
 
                                        9
<PAGE>   36
 
                      The Fund pays WMC a basic advisory fee calculated by
                      applying varying percentage rates to the average net
                      assets of the Fund:
 
   
<TABLE>
<CAPTION>
                                            NET ASSETS
                                       --------------------    RATE
                                                               -----
                                       <S>                     <C>
                                       First $1 billion        .100%
                                       Next $2 billion         .050%
                                       Next $7 billion         .040%
                                       Over $10 billion        .030%
</TABLE>
    
 
   
                      Effective with the quarter ending March 31, 1997 the basic
                      advisory fee may be increased or decreased by applying an
                      adjustment formula based on the investment performance of
                      the Fund relative to the investment performance of a
                      "composite index." This composite index comprises the
                      Lehman Long-Term Corporate AA or Better Bond Index (65%)
                      and a 35% weighting in a blended equity composite (75%
                      Standard & Poor's/BARRA Value Index and 25% Standard &
                      Poor's Utilities Index).
    
 
   
                      During the fiscal year ended December 31, 1995, the total
                      advisory fees paid by the Fund to WMC represented an
                      effective annual base rate of .07 of 1% of the Fund's
                      average net assets. This fee was paid under a previous fee
                      schedule that provided for a higher rate of fees.
    
 
                      The investment advisory agreement authorizes WMC to select
                      brokers or dealers to execute purchases and sales of the
                      Fund's portfolio securities, and directs WMC to use its
                      best efforts to obtain the best available price and most
                      favorable execution with respect to all transactions. The
                      full range and quality of brokerage services are
                      considered in making these determinations.
 
                      The Fund has authorized WMC to pay higher commissions in
                      recognition of brokerage services felt necessary for the
                      achievement of better execution, provided WMC believes
                      this to be in the best interest of the Fund. Although the
                      Fund does not market its shares through intermediary
                      brokers or dealers, the Fund may place orders with
                      qualified broker-dealers who recommend the Fund to clients
                      if the Officers of the Fund believe that the quality of
                      the transaction and the commission are comparable to what
                      they would be with other qualified brokerage firms.
 
                      The Fund's Board of Directors may, without the approval of
                      shareholders, provide for: (a) the employment of a new
                      investment adviser pursuant to the terms of a new advisory
                      agreement either as a replacement for an existing adviser
                      or as an additional adviser; (b) a change in the terms of
                      an advisory agreement; and (c) the continued employment of
                      an existing adviser on the same advisory contract terms
                      where a contract has been assigned because of a change in
                      control of the adviser. Any such change will only be made
                      upon not less than 30 days' prior written notice to
                      shareholders of the Fund which shall include substantially
                      the information concerning the adviser that would have
                      normally been included in a proxy statement.
- --------------------------------------------------------------------------------
 
                                       10
<PAGE>   37
 
   
PERFORMANCE
RECORD                The table below provides investment results for the Fund
                      for several periods throughout the Fund's lifetime. The
                      results shown represent "total return" investment
                      performance, which assumes the reinvestment of all capital
                      gains and income dividends for the indicated periods. Also
                      included is comparative information with respect to two
                      performance indexes: a Composite Index, comprised of 65%
                      of the Lehman Long-Term Corporate AA or Better Bond Index
                      and a 35% weighting in a blended equity composite (75%
                      Standard & Poor's/BARRA Value Index and 25% Standard &
                      Poor's Utility Index); and the Consumer Price Index, a
                      statistical measure of changes in the prices of goods and
                      services. The tables do not make any allowance for
                      federal, state or local income taxes, which shareholders
                      must pay on a current basis.
    
 
                      The results shown should not be considered a
                      representation of the total return from an investment made
                      in the Fund today. This information is provided to help
                      investors better understand the Fund and may not provide a
                      basis for comparison with other investments or mutual
                      funds which use a different method to calculate
                      performance.
   
<TABLE>
<CAPTION>
                                                      AVERAGE ANNUAL RETURN FOR
                                                    VANGUARD/WELLESLEY INCOME FUND
                        <S>                <C>                    <C>           <C>
                                           ------------------------------------------------
 
<CAPTION>
                        FISCAL PERIODS     VANGUARD/WELLESLEY     COMPOSITE      CONSUMER
                        ENDED 12/31/95        INCOME FUND           INDEX       PRICE INDEX
                        --------------     ------------------     ---------     -----------
                        <S>                <C>                    <C>           <C>
                        1 Year                   +28.9%             +31.3%         +2.6%
                        5 Years                   +13.3              +14.0          +2.8
                        10 Years                  +11.9              +12.7          +3.5
                        Lifetime*                 +11.6              +11.1          +5.5
                        * July 1, 1970 to December 31, 1995.
</TABLE>
    
 
- --------------------------------------------------------------------------------
 
DIVIDENDS,            The Fund expects to pay dividends quarterly from ordinary
CAPITAL GAINS         income. Net capital gains distributions, if any, will be
AND TAXES             made annually. Dividend and capital gains distributions
                      are automatically reinvested in additional shares. The
THE FUND PAYS         Fund intends to continue to qualify for taxation as a
QUARTERLY DIVIDENDS   "regulated investment company" under the Internal Revenue
AND ANY CAPITAL       Code so that it will not be subject to federal income tax
GAINS ANNUALLY        to the extent its income is distributed to shareholders.
 
                      If you utilize the Fund as an investment option in an
                      employer-sponsored retirement savings plan, dividend and
                      capital gains distributions from the Fund ordinarily will
                      not be subject to current taxation, but will accumulate on
                      a tax-deferred basis. In general, employer-sponsored
                      retirement and savings plans are governed by complex tax
                      rules. If you participate in such a plan, consult your
                      plan administrator, your plan's Summary Plan Description,
                      or a professional tax adviser regarding the tax
                      consequences of your participation in the plan and of any
                      plan contributions or withdrawals.
- --------------------------------------------------------------------------------
 
THE SHARE PRICE
OF THE FUND           The Fund's share price or "net asset value" per share is
                      determined by dividing the total market value of the
                      Fund's investments and other assets, less any liabilities,
                      by the number of outstanding shares of the Fund. Net asset
                      value per share is
 
                                       11
<PAGE>   38
 
   
                      determined as of the close of the New York Stock Exchange
                      (generally 4:00 p.m. Eastern time) on each day that the
                      Exchange is open for trading. Portfolio securities that
                      are listed on a securities exchange are valued at the last
                      quoted sales price on the day the valuation is made. Price
                      information on listed securities is taken from the
                      exchange where the security is primarily traded.
                      Securities which are listed on an exchange and which are
                      not traded on the valuation date are valued at the mean
                      between the bid and asked prices. Unlisted securities for
                      which market quotations are readily available and
                      preferred stocks are valued at the latest quoted bid
                      price.
    
 
   
                      Securities may be valued on the basis of prices provided
                      by a pricing service when such prices are believed to
                      reflect the fair market value of such securities. For
                      bonds and other fixed-income securities, the prices
                      provided by a pricing service may be determined without
                      regard to bid or last sale prices of each security but
                      take into account institutional-size trading in similar
                      groups of securities and any developments related to
                      specific securities. Short-term instruments (with
                      remaining maturities of 60 days or less) are valued at
                      cost, plus or minus any amortized discount or premium,
                      which approximates market values. Other assets and
                      securities for which no quotations are readily available
                      are valued at fair value as determined in good faith by
                      the Directors.
    
 
   
                      The Fund's share price can be found daily in the mutual
                      fund listings of most major newspapers under the heading
                      of Vanguard.
    
- --------------------------------------------------------------------------------
 
GENERAL
INFORMATION           The Fund is a Maryland corporation. The Articles of
                      Incorporation permit the Directors to issue 450,000,000
                      shares of common stock, with a $.10 par value. The Board
                      of Directors has the power to designate one or more
                      classes ("series") of shares of common stock and to
                      classify or reclassify any unissued shares with respect to
                      such series. Currently the Fund is offering one series of
                      shares.
 
                      The shares of the Fund are fully paid and non-assessable;
                      have no preference as to conversion, exchange, dividends,
                      retirement or other features; and have no pre-emptive
                      rights. Such shares have non-cumulative voting rights,
                      meaning that the holders of more than 50% of the shares
                      voting for the election of Directors can elect 100% of the
                      Directors if they so choose.
 
                      Annual meetings of shareholders will not be held except as
                      required by the Investment Company Act of 1940 and other
                      applicable law. An annual meeting will be held to vote on
                      the removal of a Director or Directors of the Fund if
                      requested in writing by the holders of not less than 10%
                      of the outstanding shares of the Fund.
 
   
                      All securities and cash are held by Morgan Guaranty Trust
                      Company, New York, NY. CoreStates Bank, N.A., holds daily
                      cash balances that are used by the Fund to invest in
                      repurchase agreements or securities acquired in these
                      transactions. The Vanguard Group, Inc., Valley Forge, PA,
                      serves as the Fund's Transfer and Dividend Disbursing
                      Agent. Price Waterhouse LLP serves as independent
                      accountants for the Fund and will audit its financial
                      statements annually. The Fund is not involved in any
                      litigation.
    
- --------------------------------------------------------------------------------
 
                                       12
<PAGE>   39
 
                                 SERVICE GUIDE
 
PARTICIPATING IN
YOUR PLAN             The Fund is available as an investment option in your
                      retirement or savings plan. The administrator of your plan
                      or your employee benefits office can provide you with
                      detailed information on how to participate in your plan
                      and how to elect the Fund as an investment option.
 
                      If you have any questions about the Fund, including the
                      Fund's investment objective, policies, risk
                      characteristics or historical performance, please contact
                      Participant Services (1-800-523-1188).
 
                      If you have questions about your account, contact your
                      plan administrator or the organization which provides
                      recordkeeping services for your plan.
- --------------------------------------------------------------------------------
 
   
INVESTMENT OPTIONS
ALLOCATIONS, AND
PAYROLL CHANGES       You may be permitted to elect different investment
                      options, alter the amounts contributed to your plan, or
                      change how contributions are allocated among your
                      investment options in accordance with your plan's specific
                      provisions. See your plan administrator or employee
                      benefits office for more details.
    
- --------------------------------------------------------------------------------
 
   
TRANSACTIONS IN
FUND SHARES           Purchases, exchanges or redemptions of the Fund's shares
                      are effective when received in "good order" by Vanguard.
                      "Good order" means that complete information on the
                      purchase, exchange or redemption and the appropriate
                      signatures and monies have been received by Vanguard.
    
- --------------------------------------------------------------------------------
 
MAKING EXCHANGES      Your plan may allow you to exchange monies from one
                      investment option to another. However, the Fund reserves
                      the right to refuse any exchange purchase request. Check
                      with your plan administrator for details on the rules
                      governing exchanges in your plan. Certain investment
                      options, particularly company stock or guaranteed
                      investment contracts (GICs), may be subject to unique
                      restrictions.
 
                      Before making an exchange, you should consider the
                      following:
 
                      - If you are making an exchange to another Vanguard Fund
                        option, please read the Fund's prospectus. Contact
                        Participant Services (1-800-523-1188) for a copy.
 
                      - Exchanges are accepted by Vanguard only as permitted by
                        your plan. Your plan administrator can explain how
                        frequently exchanges are allowed.
- --------------------------------------------------------------------------------
 
                                       13
<PAGE>   40
 
                     [THIS PAGE INTENTIONALLY LEFT BLANK.]
<PAGE>   41
 
                     [THIS PAGE INTENTIONALLY LEFT BLANK.]
<PAGE>   42
 
   
<TABLE>
<S>     <C>                            <C>                         <C>
        LOGO                                                                                                                  LOGO
        -------------------------------                                                                                       LOGO
                                                                                             I  N  S  T  I  T  U  T  I  O  N  A  L
        THE VANGUARD GROUP                                                                            P  R  O  S  P  E  C  T  U  S
        OF INVESTMENT                                                                                               APRIL 23, 1996
        COMPANIES                                                                                                             LOGO
        Vanguard Financial Center
        P.O. Box 2900
        Valley Forge, PA 19482
        INSTITUTIONAL PARTICIPANT
        SERVICES DEPARTMENT:
        1-800-523-1188
        TRANSFER AGENT:
        The Vanguard Group, Inc.
        Vanguard Financial Center
        Valley Forge, PA 19482
        I027
</TABLE>
    
 
- --------------------------------------------------------------------------------
<PAGE>   43
 
                                     PART B
 
                      VANGUARD/WELLESLEY INCOME FUND, INC.
 
                      STATEMENT OF ADDITIONAL INFORMATION
 
   
                                 APRIL 23, 1996
    
 
   
     This Statement is not a prospectus but should be read in conjunction with
the Fund's current Prospectus (dated April 23, 1996). To obtain the Prospectus
please call:
    
 
                        INVESTOR INFORMATION DEPARTMENT
                                 1-800-662-7447
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                            PAGE
                                                                                            ----
<S>                                                                                         <C>
Investment Objective and Policies.........................................................     1
Investment Limitations....................................................................     5
Purchase of Shares........................................................................     7
Redemption of Shares......................................................................     7
Yield and Total Return....................................................................     7
The Vanguard Group........................................................................     8
Investment Advisory Services..............................................................    11
Portfolio Transactions....................................................................    13
Performance Measures......................................................................    14
Appendix-Description and Ratings of Securities............................................    16
Financial Statements......................................................................    16
</TABLE>
    
 
                       INVESTMENT OBJECTIVE AND POLICIES
 
     PORTFOLIO TURNOVER  While the rate of portfolio turnover is not a limiting
factor when management deems changes appropriate, it is anticipated that the
Fund's annual common stock portfolio turnover rate will not normally exceed 40%.
The Fund's bond and common stock portfolio turnover rate for each of its last
ten fiscal years is set forth under "Financial Highlights," in the Fund's
Prospectus.
 
   
     REPURCHASE AGREEMENTS  The Fund may invest in repurchase agreements with
commercial banks, brokers or dealers either for defensive purposes due to market
conditions or to generate income from its excess cash balances. A repurchase
agreement is an agreement under which the Fund acquires a money market
instrument (generally a security issued by the U.S. Government or an agency
thereof, a banker's acceptance or a certificate of deposit) from a commercial
bank, broker or dealer, subject to resale to the seller at an agreed upon price
and date (normally, the next business day). A repurchase agreement may be
considered a loan collateralized by securities. The resale price reflects an
agreed upon interest rate effective for the period the instrument is held by the
Fund and is unrelated to the interest rate on the underlying instrument. In
these transactions, the securities acquired by the Fund (including accrued
interest earned thereon) must have a total value in excess of the value of the
repurchase agreement and are held by a custodian bank until repurchased. In
addition, the Fund's Board of Directors will monitor the Fund's repurchase
agreement transactions generally and will establish guidelines and standards for
review by the investment adviser of the creditworthiness of any bank, broker or
dealer party to a repurchase agreement with the Fund. No more than an aggregate
of 15% of the Fund's assets, at the time of investment, will be invested in
repurchase agreements having maturities longer than seven days and securities
subject to legal or contractual restrictions on resale for which there are no
readily available market quotations. From time to time, the Fund's Board of
Directors may determine that certain restricted securities known as Rule 144A
securities are liquid and not subject to the 15% limitation described above. See
"Illiquid Securities" on page 3.
    
 
     The use of repurchase agreements involves certain risks. For example, if
the other party to the agreement defaults on its obligation to repurchase the
underlying security at a time when the value of the security has
 
                                        1
<PAGE>   44
 
declined, the Fund may incur a loss upon disposition of the security. If the
other party to the agreement becomes insolvent and subject to liquidation or
reorganization under the Bankruptcy Code or other laws, a court may determine
that the underlying security is collateral for a loan by the Fund not within the
control of the Fund and therefore the Fund may not be able to substantiate its
interest in the underlying security and may be deemed an unsecured creditor of
the other party to the agreement. While the Fund's management acknowledges these
risks, it is expected that they can be controlled through careful monitoring
procedures.
 
   
     LENDING OF SECURITIES  The Fund may lend its securities to qualified
institutional investors who need to borrow securities in order to complete
certain transactions, such as covering short sales, avoiding failures to deliver
securities or completing arbitrage operations. By lending its portfolio
securities, the Fund attempts to increase its net investment income through the
receipt of interest on the loan. Any gain or loss in the market price of the
securities loaned that might occur during the term of the loan would be for the
account of the Fund. The Fund may lend its portfolio securities to qualified
brokers, dealers, banks or other financial institutions, so long as the terms,
the structure and the aggregate amount of such loans are not inconsistent with
the Investment Company Act of 1940, or the Rules and Regulations or
interpretations of the Securities and Exchange Commission (the "Commission")
thereunder, which currently require that (a) the borrower pledge and maintain
with the Fund collateral consisting of cash, an irrevocable letter of credit
issued by a domestic U.S. bank, or securities issued or guaranteed by the United
States Government having a value at all times not less than 100% of the value of
the securities loaned, (b) the borrower add to such collateral whenever the
price of the securities loaned rises (i.e. the borrower "marks to the market" on
a daily basis), (c) the loan be made subject to termination by the Fund at any
time, and (d) the Fund receive reasonable interest on the loan (which may
include the Fund's investing any cash collateral in interest bearing short-term
investments), any distribution on the loaned securities and any increase in
their market value. Loan arrangements made by the Fund will comply with all
other applicable regulatory requirements, including the rules of the New York
Stock Exchange, which rules presently require the borrower, after notice, to
redeliver the securities within the normal settlement time of three business
days. All relevant facts and circumstances, including the creditworthiness of
the broker, dealer or institution, will be considered in making decisions with
respect to the lending of securities, subject to review by the Fund's Board of
Directors.
    
 
   
     At the present time, the Staff of the Commission does not object if an
investment company pays reasonable negotiated fees in connection with loaned
securities, so long as such fees are set forth in a written contract and
approved by the investment company's directors. In addition, voting rights pass
with the loaned securities, but if a material event will occur affecting an
investment on loan, the loan must be called and the securities voted.
    
 
   
     FOREIGN INVESTMENTS  As indicated in the Prospectus, the Fund may include
foreign securities to a certain extent. Investors should recognize that
investing in foreign companies involves certain special considerations which are
not typically associated with investing in U.S. companies. Among these risks are
the following:
    
 
   
     Country Risk  As foreign companies are not generally subject to uniform
accounting, auditing and financial reporting standards and practices comparable
to those applicable to domestic companies, there may be less publicly available
information about certain foreign companies than about domestic companies.
Securities of some foreign companies are generally less liquid and more volatile
than securities of comparable domestic companies. There is generally less
government supervision and regulation of stock exchanges, brokers and listed
companies than in the U.S. In addition, with respect to certain foreign
countries, there is the possibility of expropriation or confiscatory taxation,
political or social instability, or diplomatic developments which could affect
U.S. investments in those countries.
    
 
   
     Although the Fund will endeavor to achieve most favorable execution costs
in its portfolio transactions in foreign securities, fixed commissions on many
foreign stock exchanges are generally higher than negotiated commissions on U.S.
exchanges. In addition, it is expected that the expenses for custodial
arrangements of the Fund's foreign securities will be somewhat greater than the
expenses for the custodian arrangement for handling U.S. securities of equal
value.
    
 
                                        2
<PAGE>   45
 
   
     Certain foreign governments levy withholding taxes against dividend and
interest income. Although in some countries a portion of these taxes is
recoverable, the non-recovered portion of foreign withholding taxes will reduce
the income the Fund receives from its foreign investments.
    
 
   
     Currency Risk  Since the stocks of foreign companies are frequently
denominated in foreign currencies, and since the Fund may temporarily hold
uninvested reserves in bank deposits in foreign currencies, the Fund will be
affected favorably or unfavorably by changes in currency rates and in exchange
control regulations, and may incur costs in connection with conversions between
various currencies. The investment policies of the Fund permit it to enter into
forward foreign currency exchange contracts in order to hedge holdings and
commitments against changes in the level of future currency rates. Such
contracts involve an obligation to purchase or sell a specific currency at a
future date at a price set at the time of the contract.
    
 
   
     ILLIQUID SECURITIES  Illiquid securities are securities that may not be
sold or disposed of in the ordinary course of business within seven business
days at approximately the value at which they are being carried on a Fund's
books. An illiquid security includes repurchase agreements which have a maturity
of longer than seven days, securities which are illiquid by virtue of the
absence of a readily available market, and demand instruments with a demand
notice exceeding seven days. Illiquid securities may include securities that are
not registered under the Securities Act of 1933 (the "1933 Act"); however,
unregistered securities that can be sold to "qualified institutional buyers" in
accordance with Rule 144A under the 1933 Act will not be considered illiquid so
long as it is determined by the Fund's advisor that an adequate trading market
exists for the security.
    
 
   
     FUTURES CONTRACTS AND OPTIONS  The Fund may enter into futures contracts,
options, and options on futures contracts for the purpose of simulating full
investment and reducing transactions costs. Futures contracts provide for the
future sale by one party and purchase by another party of a specified amount of
a specific security at a specified future time and at a specified price. Futures
contracts which are standardized as to maturity date and underlying financial
instrument are traded on national futures exchanges. Futures exchanges and
trading are regulated under the Commodity Exchange Act by the Commodity Futures
Trading Commission ("CFTC"), a U.S. Government Agency. Assets committed to
futures contracts will be segregated at the Fund's custodian bank to the extent
required by law.
    
 
     Although futures contracts by their terms call for actual delivery or
acceptance of the underlying securities, in most cases the contracts are closed
out before the settlement date without the making or taking of delivery. Closing
out an open futures position is done by taking an opposite position ("buying" a
contract which has previously been "sold," or "selling" a contract previously
purchased) in an identical contract to terminate the position. Brokerage
commissions are incurred when a futures contract is bought or sold.
 
     Futures traders are required to make a good faith margin deposit in cash or
government securities with a broker or custodian to initiate and maintain open
positions in futures contracts. A margin deposit is intended to assure
completion of the contract (delivery or acceptance of the underlying security)
if it is not terminated prior to the specified delivery date. Minimal initial
margin requirements are established by the futures exchange and may be changed.
Brokers may establish deposit requirements which are higher than the exchange
minimums. Futures contracts are customarily purchased and sold on margin which
may range upward from less than 5% of the value of the contract being traded.
 
     After a futures contract position is opened, the value of the contract is
marked to market daily. If the futures contract price changes to the extent that
the margin on deposit does not satisfy margin requirements, payment of
additional "variation" margin will be required. Conversely, change in the
contract value may reduce the required margin, resulting in a repayment of
excess margin to the contract holder. Variation margin payments are made to and
from the futures broker for as long as the contract remains open. The Fund
expects to earn interest income on its margin deposits.
 
     Traders in futures contracts may be broadly classified as either "hedgers"
or "speculators." Hedgers use the futures markets primarily to offset
unfavorable changes in the value of securities otherwise held for investment
purposes or expected to be acquired by them. Speculators are less inclined to
own the securities underlying the futures contracts which they trade, and use
futures contracts with the expectation of realizing
 
                                        3
<PAGE>   46
 
profits from fluctuations in the prices of underlying securities. The Fund
intends to use futures contracts only for bona fide hedging purposes.
 
     Regulations of the CFTC applicable to the Fund require that all of its
futures transactions constitute bona fide hedging transactions. The Fund will
only sell futures contracts to protect securities it owns against price declines
or purchase contracts to protect against an increase in the price of securities
it intends to purchase. As evidence of this hedging interest, the Fund expects
that approximately 75% of its futures contract purchases will be "completed,"
that is, equivalent amounts of related securities will have been purchased or
are being purchased by the Fund upon sale of open futures contracts.
 
     Although techniques other than the sale and purchase of futures contracts
could be used to control the Fund's exposure to market fluctuations, the use of
futures contracts may be a more effective means of hedging this exposure. While
the Fund will incur commission expenses in both opening and closing out futures
positions, these costs are lower than transaction costs incurred in the purchase
and sale of the underlying securities.
 
     RESTRICTIONS ON THE USE OF FUTURES CONTRACTS  The Fund will not enter into
futures contract transactions to the extent that, immediately thereafter, the
sum of its initial margin deposits on open contracts exceeds 5% of the market
value of the Fund's total assets. In addition, the Fund will not enter into
futures contracts to the extent that its outstanding obligations to purchase
securities under these contracts would exceed 20% of the Fund's total assets.
 
     RISK FACTORS IN FUTURES TRANSACTIONS  Positions in futures contracts may be
closed out only on an Exchange which provides a secondary market for such
futures. However, there can be no assurance that a liquid secondary market will
exist for any particular futures contract at any specific time. Thus, it may not
be possible to close a futures position. In the event of adverse price
movements, the Fund would continue to be required to make daily cash payments to
maintain its required margin. In such situations, if the Fund has insufficient
cash, it may have to sell portfolio securities to meet daily margin requirements
at a time when it may be disadvantageous to do so. In addition, the Fund may be
required to make delivery of the instruments underlying futures contracts it
holds. The inability to close options and futures positions also could have an
adverse impact on the ability to effectively hedge it.
 
     The Fund will minimize the risk that it will be unable to close out a
futures contract by only entering into futures which are traded on national
futures exchanges and for which there appears to be a liquid secondary market.
 
     The risk of loss in trading futures contracts in some strategies can be
substantial, due both to the low margin deposits required, and the extremely
high degree of leverage involved in futures pricing. As a result, a relatively
small price movement in a futures contract may result in immediate and
substantial loss (as well as gain) to the investor. For example, if at the time
of purchase, 10% of the value of the futures contract is deposited as margin, a
subsequent 10% decrease in the value of the futures contract would result in a
total loss of the margin deposit, before any deduction for the transaction
costs, if the account were then closed out. A 15% decrease would result in a
loss equal to 150% of the original margin deposit if the contract were closed
out. Thus, a purchase or sale of a futures contract may result in losses in
excess of the amount invested in the contract. The Fund also bears the risk that
the Adviser will incorrectly predict market trends. However, because the futures
strategies of the Fund are engaged in only for hedging purposes, the Adviser
does not believe that the Fund is subject to the risks of loss frequently
associated with futures transactions. The Fund would presumably have sustained
comparable losses if, instead of the futures contract, it had invested in the
underlying financial instrument and sold it after the decline.
 
     Utilization of futures transactions by the Fund does involve the risk of
imperfect or no correlation where the securities underlying futures contracts
have different maturities than the portfolio securities being hedged. It is also
possible that the Fund could both lose money on futures contracts and also
experience a decline in value of its portfolio securities. There is also the
risk of loss by the Fund of margin deposits in the event of bankruptcy of a
broker with whom the Fund has an open position in a futures contract or related
 
                                        4
<PAGE>   47
 
option. Additionally, investments in futures contracts and options involve the
risk that the investment adviser will incorrectly predict stock market and
interest rate trends.
 
     Most futures exchanges limit the amount of fluctuation permitted in futures
contract prices during a single trading day. The daily limit establishes the
maximum amount that the price of a futures contract may vary either up or down
from the previous day's settlement price at the end of a trading session. Once
the daily limit has been reached in a particular type of contract, no trades may
be made on that day at a price beyond that limit. The daily limit governs only
price movement during a particular trading day and therefore does not limit
potential losses, because the limit may prevent the liquidation of unfavorable
positions. Futures contract prices have occasionally moved to the daily limit
for several consecutive trading days with little or no trading, thereby
preventing prompt liquidation of future positions and subjecting some futures
traders to substantial losses.
 
     FEDERAL TAX TREATMENT OF FUTURES CONTRACTS  The Fund is required for
Federal income tax purposes to recognize as income for each taxable year its net
unrealized gains and losses on certain futures contracts held as of the end of
the year as well as those actually realized during the year. In most cases, any
gain or loss recognized with respect to a futures contract is considered to be
60% long-term capital gain or loss and 40% short-term capital gain or loss,
without regard to the holding period of the contract. Furthermore, sales of
futures contracts which are intended to hedge against a change in the value of
securities held by the Fund may affect the holding period of such securities
and, consequently, the nature of the gain or loss on such securities upon
disposition. A Fund may be required to defer the recognition of losses on
futures contracts to the extent of any unrecognized gains on related positions
held by the Fund.
 
     In order for the Fund to continue to qualify for Federal income tax
treatment as a regulated investment company, at least 90% of its gross income
for a taxable year must be derived from qualifying income; i.e., dividends,
interest, income derived from loans of securities, gains from the sale of
securities or of foreign currencies or other income derived with respect to the
Fund's business of investing in securities. In addition, gains realized on the
sale or other disposition of securities held for less than three months must be
limited to less than 30% of the Fund's annual gross income. Any net gain
realized from the closing out of futures contracts will be considered gain from
the sale of securities and therefore be qualifying income for purposes of the
90% requirement. In order to avoid realizing excessive gains on securities held
less than three months, the Fund may be required to defer the closing out of
futures contracts beyond the time when it would otherwise be advantageous to do
so. It is anticipated that unrealized gains on futures contracts, which have
been open for less than three months as of the end of the Fund's fiscal year and
which are recognized for tax purposes, will not be considered gains on sales of
securities held less than three months for the purpose of the 30% test.
 
     The Fund will distribute to shareholders annually any net capital gains
which have been recognized for Federal income tax purposes (including unrealized
gains at the end of the Fund's fiscal year) on futures transactions. Such
distributions will be combined with distributions of capital gains realized on
the Fund's other investments and shareholders will be advised on the nature of
the distributions.
 
                             INVESTMENT LIMITATIONS
 
     The following restrictions and fundamental policies cannot be changed
without approval of the holders of a majority of the outstanding shares of the
Fund (as defined in the Investment Company Act of 1940). The Fund may not under
any circumstances:
 
      1) Invest for the purpose of controlling management of any company;
 
      2) With respect to 75% of the value of its total assets, purchase the
         securities of any issuer (except obligations of the United States
         government and its instrumentalities) if as a result the Fund would
         hold more than 10% of the outstanding voting securities of the issuer,
         or more than 5% of the value of the Fund's total assets would be
         invested in the securities of such issuer;
 
      3) Invest in securities of other investment companies, except as may be
         acquired as part of a merger, consolidation or acquisition of assets
         approved by the Fund's shareholders or otherwise to the extent
         permitted by Section 12 of the Investment Company Act of 1940. The Fund
         will invest only in
 
                                        5
<PAGE>   48
 
         investment companies which have investment objectives and investment
         policies consistent with those of the Fund;
 
      4) Engage in the business of underwriting securities issued by other
         persons, except to the extent that the Fund may technically be deemed
         to be an underwriter under the Securities Act of 1933, as amended, in
         disposing of investment securities;
 
      5) Purchase or otherwise acquire any security if, as a result, more than
         15% of its net assets would be invested in securities that are illiquid
         (including the Fund's investment in The Vanguard Group, Inc.);
 
   
      6) Borrow money, except that the Fund may borrow from banks (or through
         reverse repurchase agreements), for temporary or emergency (not
         leveraging) purposes, including the meeting of redemption requests
         which might otherwise require the untimely disposition of securities,
         in an amount not exceeding 10% of the value of the Fund's net assets
         (including the amount borrowed and the value of any outstanding reverse
         repurchase agreements) at the time the borrowing is made. Whenever
         borrowings exceed 5% of the value of the Fund's net assets, the Fund
         will not make any additional investments;
 
      7) Invest in commodities except that the Fund may invest in stock futures
         contracts or stock options to the extent that not more than 5% of the
         Fund's assets are required as deposit to secure obligations under
         futures contracts and not more than 20% of the Fund's assets are
         invested in futures contracts and options at any time or purchase or
         sell real estate, although the Fund may purchase and sell securities of
         companies which deal in real estate, or interests therein;
 
      8) Purchase securities on margin or sell any securities short except as
         specified above in investment limitation No. 7;
 
      9) Pledge, mortgage or hypothecate any of its assets to an extent greater
         than 5% of the value of its total assets;
 
     10) Purchase or retain securities of an issuer if an officer or director of
         such issuer is an officer or Director of the Fund or its investment
         adviser and one or more of such officers or directors of the Fund or
         its investment adviser owns beneficially more than  1/2% of the shares
         or securities of such issuer and all such directors and officers owning
         more than  1/2% of such shares or securities together own more than 5%
         of such shares or securities;
 
     11) Make loans except (i) by purchasing bonds, debentures or similar
         obligations (including repurchase agreements) which are either publicly
         distributed or customarily purchased by institutional investors, and
         (ii) as provided under "Lending of Securities"; and
 
     12) Invest more than 25% of the value of its total assets in any one
         industry. Utility companies will be divided according to their
         services; for example, gas, gas transmission, electric and gas,
         electric, and telephone will each be considered a separate industry.
 
     Although not fundamental policies subject to shareholder vote, as long as
the Fund's shares are registered for sale in certain states, it may not invest
in put, calls, straddle or spread options (except as specified above in
investment limitation No. 7) or in interests in oil, gas or other mineral
exploration or development programs.
 
     If a percentage restriction is adhered to at the time an investment is
made, a later increase in percentage resulting from a change in the value of
assets will not constitute a violation of such restriction.
 
     The above-mentioned investment limitations are considered at the time
investment securities are purchased. Notwithstanding these limitations, the Fund
may own all or any portion of the securities of, or make loans to, or contribute
to the costs or other financial requirements of any company which will be wholly
owned by the Fund and one or more other investment companies and is primarily
engaged in the business of providing, at-cost, management, administrative,
distribution or related services to the Fund and other investment companies. See
"Management of the Fund."
 
                                        6
<PAGE>   49
 
                               PURCHASE OF SHARES
 

    
   
     The Fund reserves the right in its sole discretion (i) to suspend the
offerings of its shares, (ii) to reject purchase or exchange purchase orders
when in the judgment of management such rejection is in the best interest of the
Fund, and (iii) to reduce or waive the minimum for any other restrictions on
initial and subsequent investments for certain fiduciary accounts or under
circumstances where certain economies can be achieved in sales of the Fund's
shares.
    
 
                              REDEMPTION OF SHARES
 
     The Fund may suspend redemption privileges or postpone the date of payment
(i) during any period that the New York Stock Exchange is closed, or trading on
the Exchange is restricted as determined by the Securities and Exchange
Commission (the "Commission"), (ii) during any period when an emergency exists
as defined by the rules of the Commission as a result of which it is not
reasonably practicable for the Fund to dispose of securities owned by it, or
fairly to determine the value of its assets, and (iii) for such other periods as
the Commission may permit.
 
     The Fund has made an election with the Commission to pay in cash all
redemptions requested by any shareholder of record limited in amount during any
90-day period to the lesser of $250,000 or 1% of the net assets of the Fund at
the beginning of such period. Such commitment is irrevocable without the prior
approval of the Commission. Redemptions in excess of the above limits may be
paid in whole or in part, in investment securities or in cash, as the Directors
may deem advisable; however, payment will be made wholly in cash unless the
Directors believe that economic or market conditions exist which would make such
a practice detrimental to the best interests of the Fund. If redemptions are
paid in investment securities, such securities will be valued as set forth in
the Prospectus under "The Fund's Share Price" and a redeeming shareholder would
normally incur brokerage expenses if he converted these securities to cash.
 
     No charge is made by the Fund for redemptions. Any redemption may be more
or less than the shareholder's cost depending on the market value of the
securities held by the Fund.
 
   
     SIGNATURE GUARANTEES  To protect your account, the Fund and Vanguard from
fraud, signature guarantees are required for certain redemptions. Signatures
guarantees enable the Fund to verify the identity of the person who has
authorized a redemption from your account. Signature guarantees are required in
connection with: (1) all redemptions, regardless of the amount involved, when
the proceeds are to be paid to someone other than the registered owner(s) and/or
to an address other than the address of record; and (2) share transfer requests.
These requirements are not applicable to redemptions in Vanguard's prototype
plans except in connection with: (1) distributions made when the proceeds are to
be paid to someone other than the plan participant; (2) certain authorizations
to effect exchanges by telephone; and (3) when proceeds are to be wired. These
requirements may be waived by the Fund in certain instances.
    
 
     Signature guarantees may be provided by banks, brokers, or any other
guarantor institution that Vanguard deems acceptable. Notaries public are not
acceptable guarantors.
 
     The signature guarantees must appear either: (1) on the written request for
redemption; (2) on a separate instrument for assignment ("stock power") which
should specify the total number of shares to be redeemed; or (3) on all stock
certificates tendered for redemption and, if shares held by the Fund are also
being redeemed, on the letter or stock power.
 
                             YIELD AND TOTAL RETURN
 
   
     The yield of the Fund for the 30-day period ended December 31, 1995 was
+5.66%.
    
 
   
     The average annual total return of the Fund for the one-, five- and
ten-year periods ended December 31, 1995 was +28.91%, +13.29% and +11.93%,
respectively. Total return is computed by finding the average compounded rates
of return over the one-, five- and ten-year periods set forth above that would
equate an initial amount invested at the beginning of the periods to the ending
redeemable value of the investment.
    
 
                                        7
<PAGE>   50
 
                               THE VANGUARD GROUP
 
DIRECTORS AND OFFICERS
 
     The Officers of the Fund manage its day-to-day operations and are
responsible to the Fund's Board of Directors. The Directors set broad policies
for the Fund and choose its Officers. The following is a list of Directors and
Officers of the Fund and a statement of their present positions and principal
occupations during the past five years. The mailing address of the Fund's
Directors and Officers is Post Office Box 876, Valley Forge, PA 19482.
 
   
JOHN C. BOGLE, Chairman, and Director
    
   
     Chairman, and Director of The Vanguard Group, Inc., and of each of the
     investment companies in The Vanguard Group; Director of The Mead
     Corporation and General Accident Insurance.
    
 
   
JOHN J. BRENNAN, President, Chief Executive Officer & Director*
    
   
     President, Chief Executive Officer and Director of The Vanguard Group,
     Inc., and of each of the investment companies in The Vanguard Group.
    
 
ROBERT E. CAWTHORN, Director
     Chairman of Rhone-Poulenc Rorer, Inc.; Director of Sun Company, Inc.
 
BARBARA BARNES HAUPTFUHRER, Director
     Director of The Great Atlantic and Pacific Tea Company, ALCO Standard
     Corp., Raytheon Company, Knight-Ridder, Inc., and Massachusetts Mutual Life
     Insurance Company and Trustee Emerita of Wellesley College.
 
BRUCE K. MACLAURY, Director
     President, The Brookings Institution; Director of American Express Bank,
     Ltd., The St. Paul Companies, Inc. and Scott Paper Company.
 
BURTON G. MALKIEL, Director
     Chemical Bank Chairman's Professor of Economics, Princeton University;
     Director of Prudential Insurance Co. of America, Amdahl Corporation, Baker
     Fentress & Co., The Jeffrey Co. and Southern New England Communications
     Company.
 
ALFRED M. RANKIN, JR., Director
   
     Chairman, President and Chief Executive Officer of NACCO Industries, Inc.;
     Director of The BFGoodrich Company, and The Standard Products Company.
    
JOHN C. SAWHILL, Director
     President and Chief Executive Officer of The Nature Conservancy; formerly,
     Director and Senior Partner, McKinsey & Co., and President, New York
     University; Director of Pacific Gas and Electric Company and NACCO
     Industries.
 
JAMES O. WELCH, JR., Director
   
     Retired Chairman of Nabisco Brands, Inc., retired Vice Chairman and
     Director of RJR Nabisco; Director of TECO Energy, Inc., and Director of
     Kmart Corporation.
    
 
J. LAWRENCE WILSON, Director
   
     Chairman and Chief Executive Officer of Rohm & Haas Company; Director of
     Cummins Engine Company and Trustee of Vanderbilt University.
    
 
RAYMOND J. KLAPINSKY, Secretary*
     Senior Vice President and Secretary of The Vanguard Group, Inc.; Secretary
     of each of the investment companies in The Vanguard Group.
 
RICHARD F. HYLAND, Treasurer*
     Treasurer of The Vanguard Group, Inc. and of each of the investment
     companies in The Vanguard Group.
 
KAREN E. WEST, Controller*
     Vice President of The Vanguard Group, Inc.; Controller of each of the
     investment companies in The Vanguard Group.
- ---------------
 
* Officers of the Fund are "interested persons" as defined in the Investment
  Company Act of 1940.
 
                                        8
<PAGE>   51
 
     Vanguard/Wellesley Income Fund is a member of The Vanguard Group of
Investment Companies. Through their jointly-owned subsidiary, The Vanguard
Group, Inc. ("Vanguard"), the Fund and the other Funds in the Group obtain at
cost virtually all of their corporate management, administrative and
distribution services. Vanguard also provides investment advisory services on an
at-cost basis to certain of the Vanguard Funds.
 
     Vanguard employs a supporting staff of management and administrative
personnel needed to provide the requisite services to the Funds and also
furnishes the Funds with necessary office space, furnishings and equipment. Each
Fund pays its share of Vanguard's net expenses which are allocated among the
Funds under methods approved by the Board of Directors (Trustees) of each Fund.
In addition, each Fund bears its own direct expenses such as legal, auditing and
custodian fees.
 
     The Fund's officers are also officers and employees of Vanguard. No officer
or employee owns, or is permitted to own, any securities of any external adviser
for the Funds.
 
     The Vanguard Group adheres to a Code of Ethics established pursuant to Rule
17j-1 under the Investment Company Act of 1940. The Code is designed to prevent
unlawful practices in connection with the purchase or sale of securities by
persons associated with Vanguard. Under Vanguard's Code of Ethics certain
officers and employees of Vanguard who are considered access persons are
permitted to engage in personal securities transactions. However, such
transactions are subject to procedures and guidelines substantially similar to
those recommended by the mutual fund industry and approved by the U.S.
Securities and Exchange Commission.
 
   
     The Vanguard Group was established and operates under a Funds' Service
Agreement which was approved by the shareholders of each of the Funds. The
amounts of which each of the Funds have invested are adjusted from time to time
in order to maintain the proportionate relationship between each Fund's relative
net assets and its contribution to Vanguard's capital. At December 31, 1995, the
Fund had contributed capital of $820,000 to Vanguard, representing 4.1% of
Vanguard's capitalization. The Fund's Service Agreement provides as follows: (a)
each Vanguard Fund may invest up to .40% of its current assets in Vanguard, and
(b) there is no other limitation on the amount that each Vanguard Fund may
contribute to Vanguard's capitalization.
    
 
   
     MANAGEMENT  Corporate management and administrative services include: (1)
executive staff; (2) accounting and financial; (3) legal and regulatory; (4)
shareholder account maintenance; (5) monitoring and control of custodian
relationships; (6) shareholder reporting; and (7) review and evaluation of
advisory and other services provided to the Funds by third parties. During the
fiscal year ended December 31, 1995, the Fund's share of Vanguard's actual net
costs of operation relating to management and administrative services (including
transfer agency) totaled approximately $15,223,000.
    
 
     DISTRIBUTION  Vanguard provides all distribution and marketing activities
for the Funds in the Group. Vanguard Marketing Corporation, a wholly-owned
subsidiary of The Vanguard Group, Inc., acts as Sales Agent for the shares of
the Funds in connection with any sales made directly to investors in the states
of Florida, Missouri, New York, Ohio, Texas and such other states as it may be
required.
 
     The principal distribution expenses are for advertising, promotional
materials and marketing personnel. Distribution services may also include
organizing and offering to the public, from time to time, one or more new
investment companies which will become members of the Group. The directors and
officers of Vanguard determine the amount to be spent annually on distribution
activities, the manner and amount to be spent on each Fund, and whether to
organize new investment companies.
 
   
     One half of the distribution expenses of a marketing and promotional nature
is allocated among the Funds based upon relative net assets. The remaining one
half of those expenses is allocated among the Funds based upon each Fund's sales
for the preceding 24 months relative to the total sales of the Funds as a Group,
provided, however, that no Fund's aggregate quarterly rate of contribution for
distribution expenses of a marketing and promotional nature shall exceed 125% of
average distribution expense rate for the Group, and that no Fund shall incur
annual distribution expenses in excess of 20/100 of 1% of its average month-end
net assets. During the fiscal year ended December 31, 1995, the Fund paid
approximately $1,346,000 of the Group's distribution and marketing expenses.
    
 
                                        9
<PAGE>   52
 
   
     INVESTMENT ADVISORY SERVICES  Vanguard provides Vanguard Money Market
Reserves, Vanguard Admiral Funds, Vanguard Municipal Bond Fund, the several
Portfolios of Vanguard Fixed Income Securities Fund, several Portfolios of
Vanguard Variable Insurance Fund, Vanguard Institutional Index Fund, Vanguard
Bond Index Fund, the Vanguard California Tax-Free Fund, Vanguard Florida Insured
Tax-Free Fund, Vanguard New Jersey Tax-Free Fund, Vanguard New York Insured
Tax-Free Fund, Vanguard Ohio Tax-Free Fund, Vanguard Pennsylvania Tax-Free Fund,
Vanguard Balanced Index Fund, Vanguard Index Trust, Vanguard International
Equity Index Fund, Vanguard Tax-Managed Fund, the Aggressive Growth Portfolio of
Vanguard Horizon Fund, a portion of Vanguard/Windsor II, a portion of
Vanguard/Morgan Growth Fund as well as several indexed separate accounts with
investment advisory services. These services are provided on an at-cost basis
from a money management staff employed directly by Vanguard. The compensation
and other expenses of this staff are paid by the Funds utilizing these services.
    
 
   
     REMUNERATION OF DIRECTORS AND OFFICERS  The Fund pays each Director, who is
not also an officer, an annual fee plus travel and other expenses incurred in
attending Board meetings. The Fund's officers and employees are paid by Vanguard
which, in turn, is reimbursed by the Fund and each other Fund in the Group, for
its proportionate share of officers' and employees' salaries and retirement
benefits. For the fiscal year ended December 31, 1995, the Fund's proportionate
share of remuneration for all Officers as a group was approximately $244,770,
and its proportionate share of the amounts contributed to the retirement plans
of all Officers as a group was approximately $6,150.
    
 
   
     During the fiscal year ended December 31, 1995, the Fund paid approximately
$25,000 in Directors' fees and expenses to its "non-interested" Directors.
    
 
     Directors who are not Officers are paid an annual fee based on the number
of years of service on the Board upon retirement. The fee is equal to $1,000 for
each year of service (up to fifteen years) and each investment company member of
the Vanguard Group contributes a proportionate amount to this fee based on its
relative net assets. Under its retirement plan, Vanguard contributes annually an
amount equal to 10% of each eligible officer's annual compensation plus 5.7% of
that part of an eligible officer's compensation during the year, if any, that
exceeds the Social Security Taxable Wage Base then in effect. Under its thrift
plan, all eligible officers are permitted to make pre-tax contributions in an
amount up to 4% of total compensation, subject to federal tax limitations, which
are matched by Vanguard on a 100% basis.
 
   
     The following table provides detailed information with respect to the
amounts paid or accrued for the Directors and Officers of the Fund for whom the
Fund's proportionate share of remuneration exceeded $60,000 for the fiscal year
ended December 31, 1995.
    
 
                         VANGUARD/WELLESLEY INCOME FUND
 
                               COMPENSATION TABLE
 
   
<TABLE>
<CAPTION>
                                AGGREGATE       PENSION OR RETIREMENT        ESTIMATED          TOTAL COMPENSATION
                               COMPENSATION      BENEFITS ACCRUED AS      ANNUAL BENEFITS     FROM ALL VANGUARD FUNDS
    NAMES OF DIRECTORS          FROM FUND       PART OF FUND EXPENSES     UPON RETIREMENT      PAID TO DIRECTORS(3)
- ---------------------------    ------------     ---------------------     ---------------     -----------------------
<S>                            <C>              <C>                       <C>                 <C>
John C. Bogle(1),(2)             $136,072               $  --                      --                      --
John J. Brennan(2)               $ 67,545               $  --                      --                      --
Barbara Barnes Hauptfuhrer       $  2,704               $ 462                 $15,000                 $59,000
Robert E. Cawthorn               $  2,704               $ 385                 $13,000                 $59,000
Bruce K. MacLaury                $  2,981               $ 456                 $12,000                 $55,000
Burton G. Malkiel                $  2,749               $ 308                 $15,000                 $60,000
Alfred M. Rankin, Jr.            $  2,749               $ 243                 $15,000                 $60,000
John C. Sawhill                  $  2,749               $ 289                 $15,000                 $60,000
James O. Welch, Jr.              $  2,704               $ 356                 $15,000                 $59,000
J. Lawrence Wilson               $  2,749               $ 257                 $15,000                 $60,000
</TABLE>
    
 
   
(1) For the period reported in this table, Mr. Bogle was the Fund's Chief
    Executive Officer, and therefore an "Interested Director."
    
   
(2) As "Interested Directors," Messrs. Bogle and Brennan receive no compensation
    for their service as Directors. Compensation amounts reported for Messrs.
    Bogle and Brennan relate to their respective positions as Chief Executive
    Officer and President of the Fund.
    
   
(3) The amounts reported in this column reflect the total compensation paid to
    each Director for their service as Director or Trustee of 34 Vanguard Funds
    (27 in the case of Mr. MacLaury).
    
 
                                       10
<PAGE>   53
 
                          INVESTMENT ADVISORY SERVICES
 
   
     The Fund employs Wellington Management Company (the "Adviser") under an
investment advisory agreement dated April 1, 1996 to manage the investment and
reinvestment of the assets of the Fund and to continuously review, supervise and
administer the Fund's investment program. The Adviser discharges its
responsibilities subject to the control of the officers and Directors of the
Fund. The Adviser is a Massachusetts general partnership whose managing partners
are Robert W. Doran, Duncan M. McFarland and John R. Ryan.
    
 
     The Fund pays the Adviser an advisory fee at the end of each fiscal
quarter, calculated by applying a quarterly rate, based on the following annual
percentage rates, to the Fund's average month-end net assets for the quarter:
 
   
<TABLE>
<CAPTION>
                                         NET ASSETS                       RATE
                    ----------------------------------------------------  ----
                    <S>                                                   <C>
                    First $1 billion....................................  .100%
                    Next $2 billion.....................................  .050%
                    Next $7 billion.....................................  .040%
                    Over $10 billion....................................  .030%
</TABLE>
    
 
   
     Effective with the quarter ending March 31, 1997, the basic advisory fee
may be increased or decreased by applying an adjustment formula based on the
investment performance of the Fund relative to the investment performance of a
"composite index." This composite index comprises the Lehman Long-Term Corporate
AA or Better Bond Index (65%) and a 35% weighting in a blended equity composite
(75% Standard & Poor's/BARRA Value Index and 25% Standard & Poor's Utilities
Index).
    
 
   
     The following table sets forth the incentive/penalty adjustment to the
basic advisory fee payable by the Fund to WMC under the new advisory agreement:
    
 
   
<TABLE>
<CAPTION>
                         CUMULATIVE 36-MONTH PERFORMANCE      PERFORMANCE FEE
                             VERSUS THE COMPOSITE INDEX          ADJUSTMENT
                    -----------------------------------------------------------
                    <S>                                      <C>
                    Less than -3%                             -0.20 X Basic Fee*
                    Between -1.5% and -3%                     -0.10 X Basic Fee
                    Between -1.5% and 1.5%                        0 X Basic Fee
                    Between +1.5% and +3%                     +0.10 X Basic Fee
                    More than +3%                             +0.20 X Basic Fee
</TABLE>
    
 
   
* For purposes of this calculation, the Basic Fee is calculated by applying the
  quarterly rate based on the Annual Basic Fee Rate using average assets over
  the same time period which the performance is measured.
    
 
   
     Until the quarter ending March 31, 1999, the performance adjustment for the
Adviser will be calculated according to the following transition rules:
    
 
   
          (a) Prior to December 31, 1996.  For the quarters ending on or prior
     to December 31, 1996, the performance adjustment will not be operable. The
     advisory fee payable by the Fund shall be the quarterly base advisory fee,
     calculated as set forth above.
    
 
   
          (b) January 1, 1997 through March 31, 1999.  Beginning with the
     quarter ending March 31, 1997, and until the quarter ending March 31, 1999,
     the Performance adjustment will be computed based upon a comparison of the
     investment performance of the Fund and that of the Composite Index over the
     number of months that have elapsed between April 1, 1996 and the end of the
     quarter for which the fee is computed, and will be applied to the average
     monthly assets over the same period. The number of percentage points by
     which the investment performance of the Fund must exceed the investment
     record of the Composite Index shall increase proportionately from .5 and 1,
     respectively, for the twelve months ending March 31, 1997, to 1.5 and 3,
     for the thirty-six months ending March 31, 1999.
    
 
   
          (c) On and After March 31, 1999.  For the quarter ending March 31,
     1999 and thereafter, the period used to calculate the incentive/penalty
     adjustment shall be the 36 months preceding the end of the quarter for
     which the fee is being computed and the number of percentage points used
     shall be 1.5 and 3. Upon request, the Fund will provide the Adviser access
     to the documents substantiating the calculation of the performance
     adjustment.
    
 
                                       11
<PAGE>   54
 
   
          The investment performance of the Fund for such period, expressed as a
     percentage of the net asset value per share of the Fund at the beginning of
     such period, shall be the sum of: (i) the change in the net asset value per
     share of the Fund during such period; (ii) the value of the cash
     distributions per share of the Fund accumulated to the end of such period;
     and (iii) the value of capital gains taxes per share paid or payable by the
     Fund on undistributed realized long-term capital gains accumulated to the
     end of such period. For this purpose, the value of distributions per share
     of realized capital gains, of dividends per share paid from investment
     income and of capital gains taxes per share paid or payable on
     undistributed realized long-term capital gains shall be treated as
     reinvested in shares of the Fund at the net asset value per share in effect
     at the close of business on the record date for the payment of such
     distributions and dividends and the date on which provision is made for
     such taxes, after giving effect to such distributions, dividends and taxes.
    
 
   
          The "investment record" of the Stock Index for the period, expressed
     as a percentage of the Stock Index level at the beginning of the period,
     shall be the sum of (i) the change in the level of the Stock Index during
     the period and (ii) the value, computed consistently with the Stock Index,
     of cash distributions having an ex-dividend date occurring within the
     period made by companies whose securities comprise the Stock Index. The
     "investment record" of the Bond Index for the period, expressed as a
     percentage of the Bond Index level at the beginning of such period shall be
     the sum of (i) the change in the level of the Bond Index during the period
     and (ii) the value of the interest accrued or paid on the bonds included in
     the Bond Index, assuming the reinvestment of such interest on a monthly
     basis. Computation of these two components as the Combined Index shall be
     made on the basis of 35% in the Stock Index and 65% in the Bond Index at
     the beginning of each quarter.
    
 
   
     During the fiscal years ended December 31, 1993, 1994 and 1995 the
investment advisory fees paid by the Fund totaled approximately $3,848,000,
$4,457,000, and $4,349,000 respectively. These fees were paid pursuant to the
terms of a previous investment advisory agreement, which called for a higher
rate of fees.
    
 
   
     The agreement continues in effect until March 31, 1998 and is renewable
thereafter, for successive one-year periods, only if such renewal is
specifically approved by a vote of the Fund's Board of Directors, including the
affirmative votes of a majority of the Directors who are not parties to the
contract or "interested persons" (as defined in the Investment Company Act of
1940) of any such party, cast in person at a meeting called for the purpose of
considering such approval. In addition, the question of continuance shall be
effected only if approved by the affirmative vote of a majority of the
outstanding voting securities of the Fund. The agreement is automatically
terminated if assigned, and may be terminated without penalty at any time (1)
either by vote of the Board of Directors of the Fund or by vote of its
outstanding voting securities on 60 days' written notice to the Adviser, or (2)
by the Adviser upon 90 days' written notice to the Fund.
    
 
     The Fund's Board of Directors may, without the approval of shareholders,
provide for:
 
     A. The employment of a new investment adviser pursuant to the terms of a
new advisory agreement, either as a replacement for an existing adviser or as an
additional adviser.
 
     B. A change in the terms of an advisory agreement.
 
     C. The continued employment of an existing adviser on the same advisory
contract terms where a contract has been assigned because of a change in control
of the adviser.
 
     Any such change will only be made upon not less than 30 days' prior written
notice to shareholders, which shall include the information concerning the
adviser that would have normally been included in a proxy statement.
 
     The agreement is automatically terminated if assigned, and may be
terminated without penalty at any time (1) by vote of the Board of Directors of
the Fund on 60 days' written notice to WMC, or (2) by WMC upon 90 days' written
notice to the Fund.
 
                                       12
<PAGE>   55
 
                             PORTFOLIO TRANSACTIONS
 
     The investment advisory agreement authorizes the Adviser (with the approval
of the Fund's Board of Directors) to select the brokers or dealers that will
execute the purchases and sales of portfolio securities for the Fund and directs
the Adviser to use its best efforts to obtain the best available price and most
favorable execution as to all transactions for the Fund. The Adviser has
undertaken to execute each investment transaction at a price and commission
which provides the most favorable total cost or proceeds reasonably obtainable
under the circumstances.
 
     In placing portfolio transactions, the Adviser will use its best judgment
to choose the broker most capable of providing the brokerage services necessary
to obtain best available price and most favorable execution. The full range and
quality of brokerage services available will be considered in making these
determinations. In those instances where it is reasonably determined that more
than one broker can offer the brokerage services needed to obtain the best
available price and most favorable execution, consideration may be given to
those brokers which supply investment research and statistical information and
provide other services in addition to execution services to the Fund and/or the
Adviser. The Adviser considers such information useful in the performance of its
obligations under the agreement but is unable to determine the amount by which
such services may reduce its expenses.
 
     The investment advisory agreement also incorporates the concepts of Section
28(e) of the Securities Exchange Act of 1934 by providing that, subject to the
approval of the Fund's Board of Directors, the Adviser may cause the Fund to pay
a broker-dealer which furnishes brokerage and research services a higher
commission than that which might be charged by another broker-dealer for
effecting the same transaction; provided that such commission is deemed
reasonable in terms of either that particular transaction or the overall
responsibilities of the Adviser to the Fund and the other Funds in the Group.
 
     Currently, it is the Fund's policy that the Adviser may at times pay higher
commissions in recognition of brokerage services felt necessary for the
achievement of better execution of certain securities transactions that
otherwise might not be available. The Adviser will only pay such higher
commissions if it believes this to be in the best interest of the Fund. Some
brokers or dealers who may receive such higher commissions in recognition of
brokerage services related to execution of securities transactions are also
providers of research information to the Adviser and/or the Fund. However, the
Adviser has informed the Fund that it will not pay higher commission rates
specifically for the purpose of obtaining research services.
 
     Since the Fund does not market its shares through intermediary brokers or
dealers, it is not the Fund's practice to allocate brokerage or principal
business on the basis of sales of its shares which may be through such firms.
However, the Fund may place portfolio orders with qualified broker-dealers who
recommend the Fund to other clients, or who act as agent in the purchase of the
Fund's shares for their clients, and may, when a number of brokers and dealers
can provide comparable best price and execution on a particular transaction,
consider the sale of Fund shares by a broker or dealer in selecting among
qualified broker-dealers.
 
   
     During the fiscal years ended December 31, 1993, 1994 and 1995 the Fund
paid $2,183,737, $2,062,311 and $1,787,291 in brokerage commissions,
respectively.
    
 
     Some securities considered for investment by the Fund may also be
appropriate for other Funds and/or clients served by the Adviser. If purchase or
sale of securities consistent with the investment policies of the Fund and one
or more of these other Funds or clients serviced by the Adviser are considered
at or about the same time, transactions in such securities will be allocated
among the several Funds and clients in a manner deemed equitable by the Adviser.
 
                                       13
<PAGE>   56
 
                              PERFORMANCE MEASURES
 
   
     Vanguard may use reprinted material discussing The Vanguard Group, Inc. or
any of the member funds of The Vanguard Group of Investment Companies.
    
 
     Each of the investment company members of the Vanguard Group, including
Vanguard/Wellesley Income Fund, may, from time to time, use one or more of the
following unmanaged indices for comparative performance purposes.
 
STANDARD AND POOR'S 500 COMPOSITE STOCK PRICE INDEX -- is a well diversified
list of 500 companies representing the U.S. Stock Market.
 
   
WILSHIRE 5000 EQUITY INDEX -- consists of more than 6,000 common equity
securities, covering all stocks in the U.S. for which daily pricing is
available.
    
 
WILSHIRE 4500 EQUITY INDEX -- consists of all stocks in the Wilshire 5000 except
for the 500 stocks in the Standard and Poor's 500 Index.
 
MORGAN STANLEY CAPITAL INTERNATIONAL EAFE INDEX -- is an arithmetic, market
value-weighted average of the performance of over 900 securities listed on the
stock exchanges of countries in Europe, Australia and the Far East.
 
   
GOLDMAN SACHS 100 CONVERTIBLE BOND INDEX -- currently includes 71 bonds and 29
preferreds. The original list of names was generated by screening for
convertible issues of $100 million or greater in market capitalization. The
index is priced monthly.
    
 
SALOMON BROTHERS GNMA INDEX -- includes pools of mortgages originated by private
lenders and guaranteed by the mortgage pools of the Government National Mortgage
Association.
 
   
SALOMON BROTHERS HIGH-GRADE CORPORATE BOND INDEX -- consists of publicly issued,
non-convertible corporate bonds rated Aa or Aaa. It is a value-weighted, total
return index, including approximately 800 issues with maturities of 12 years or
greater.
    
 
LEHMAN LONG-TERM TREASURY BOND -- is composed of all bonds covered by the
Shearson Lehman Hutton Treasury Bond Index with maturities of 10 years or
greater.
 
MERRILL LYNCH CORPORATE & GOVERNMENT BOND -- consists of over 4,500 U.S.
Treasury, Agency and investment grade corporate bonds.
 
LEHMAN CORPORATE (BAA) BOND INDEX -- all publicly offered fixed-rate,
nonconvertible domestic corporate bonds rated Baa by Moody's, with a maturity
longer than 1 year and with more than $25 million outstanding. This index
includes over 1,000 issues.
 
   
LEHMAN BROTHERS LONG-TERM CORPORATE BOND INDEX -- is a subset of the Lehman
Corporate Bond Index covering all corporate, publicly issued fixed-rate,
nonconvertible US debt issues rated at least Baa, with at least $50 million
principal outstanding and maturity greater than 10 years.
    
 
BOND BUYER MUNICIPAL INDEX (20 YEAR) BOND -- is a yield index on current coupon
high-grade general obligation municipal bonds.
 
   
STANDARD & POOR'S PREFERRED INDEX -- is a yield index based upon the average
yield of four high-grade, noncallable preferred stock issues.
    
 
NASDAQ INDUSTRIAL INDEX -- is composed of more than 3,000 industrial issues. It
is a value-weighted index calculated on price change only and does not include
income.
 
COMPOSITE INDEX -- 70% Standard & Poor's 500 Index and 30% NASDAQ Industrial
Index.
 
   
COMPOSITE INDEX -- 65% Standard & Poor's 500 Index and 35% Lehman Long-Term
Corporate AA or Better Bond Index.
    
 
                                       14
<PAGE>   57
 
   
COMPOSITE INDEX -- 65% Lehman Long-Term Corporate AA or Better Bond Index and a
35% weighting in a blended equity composite (75% Standard & Poor's/BARRA Value
Index and 25% Standard & Poor's Utilities Index).
    
 
   
LEHMAN LONG-TERM CORPORATE AA OR BETTER BOND INDEX -- consists of all publicly
issued, fixed rate, nonconvertible investment grade, dollar-denominated,
SEC-registered corporate debt rated AA or AAA.
    
 
   
RUSSELL 2000 STOCK INDEX -- consists of the smallest 2,000 stocks within the
Russell 3000; a widely-used benchmark for small capitalization common stocks.
    
 
   
LEHMAN BROTHERS AGGREGATE BOND INDEX -- is a market-weighted index that contains
individually priced U.S. Treasury, agency, corporate, and mortgage pass-through
securities corporate rated BBB- or better. The Index has a market value of over
$4 trillion.
    
 
   
LEHMAN BROTHERS MUTUAL FUND SHORT (1-5) GOVERNMENT/CORPORATE INDEX -- is a
market-weighted index that contains individually priced U.S. Treasury, agency,
and corporate investment grade bonds rated BBB- or better with maturities
between 1 and 5 years. The index has a market value of over $1.3 trillion.
    
 
   
LEHMAN BROTHERS MUTUAL FUND INTERMEDIATE (5-10) GOVERNMENT/CORPORATE INDEX -- is
a market-weighted index that contains individually priced U.S. Treasury, agency,
and corporate securities rated BBB- or better with maturities between 5 and 10
years. The index has a market value of over $600 billion.
    
 
   
LEHMAN BROTHERS MUTUAL FUND LONG (10+) GOVERNMENT/CORPORATE INDEX -- is a
market-weighted index that contains individually priced U.S. Treasury, agency,
and corporate securities rated BBB- or better with maturities greater than 10
years. The index has a market value of over $900 billion.
    
 
   
LIPPER BALANCED FUND AVERAGE -- an industry benchmark of average balanced funds
with similar investment objectives and policies, as measured by Lipper
Analytical Services, Inc.
    
 
   
LIPPER NON-GOVERNMENT MONEY MARKET FUND AVERAGE -- an industry benchmark of
average non-government money market funds with similar investment objectives and
policies, as measured by Lipper Analytical Services, Inc.
    
 
   
LIPPER GOVERNMENT MONEY MARKET FUND AVERAGE -- an industry benchmark of average
government money market funds with similar investment objectives and policies,
as measured by Lipper Analytical Services, Inc.
    
 
LIPPER SMALL COMPANY GROWTH FUND AVERAGE -- the average performance of small
company growth funds as defined by Lipper Analytical Services, Inc. Lipper
defines a small company growth fund as a fund that by prospectus or portfolio
practice, limits its investments to companies on the basis of the size of the
company. From time to time, Vanguard may advertise using the average performance
and/or the average expense ratio of the small company growth funds. (This fund
category was first established in 1982. For years prior to 1982, the results of
the Lipper Small Company Growth category were estimated using the returns of the
Funds that constituted the Group at its inception.)
 
   
LIPPER GENERAL EQUITY FUND AVERAGE -- an industry benchmark of average general
equity funds with similar investment objectives and policies, as measured by
Lipper Analytical Services, Inc.
    
 
   
LIPPER FIXED INCOME FUND AVERAGE -- an industry benchmark of average fixed
income funds with similar investment objectives and policies, as measured by
Lipper Analytical Services, Inc.
    
 
RUSSELL 3000 INDEX -- consists of approximately the 3,000 largest stocks of
U.S.-domiciled companies commonly traded on the New York and American Stock
Exchanges or the NASDAQ over-the-counter market, accounting for over 90% of the
market value of publicly traded Stocks in the U.S.
 
                                       15
<PAGE>   58
 
               APPENDIX -- DESCRIPTION AND RATINGS OF SECURITIES
 
I. DESCRIPTION OF BOND RATINGS
 
     The Fund will invest primarily in investment grade bonds (i.e. those rated
at least Baa by Moody's Investors Service, Inc. or those rated BBB by Standard &
Poor's Corporation). In the event that a bond held by the Fund is downgraded,
the adviser may continue to hold such bond. Excerpts from Moody's Investors
Service, Inc. description of its four highest preferred bond ratings:
 
     Aaa -- judged to be the best quality by all standards. Together with the
Aaa group they comprise what are generally known as high grade bonds;
A -- possess many favorable investment attributes and are to be considered as
"upper medium grade obligations"; Baa -- 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.
 
     Moody's also supplies numerical indicators 1, 2 and 3 to rating categories.
The modifier 1 indicates that the security is in the higher end of its rating
category; the modifier 2 indicates a mid-range ranking; and 3 indicates a
ranking toward the lower end of the category.
 
     The following are excerpts from Standard & Poor's Corporation description
of its four highest stock ratings:
 
     AAA -- highest grade obligations. Capacity to pay interest and repay
principal is extremely strong; AA -- also qualify as high grade obligations, a
very strong capacity to pay interest and repay principal and differs from
AAA -- issues only in small degree; A -- regarded as upper medium grade. They
have a strong capacity to pay interest and repay principal although it is
somewhat susceptible to the adverse effects of changes in circumstances and
economic conditions than debt in higher rated categories; BBB -- regarded as
having an adequate capacity to pay interest and repay principal. Whereas it
normally exhibits 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 in higher rated
categories. This group is the lowest which qualifies for commercial bank
investment.
 
     Standard & Poor's applies indicators "+", no character and "-" to its
rating categories. The indicators show relative standing within the major rating
categories.
 
II. FOREIGN INVESTMENTS
 
     The Fund may invest in the securities (payable in U.S. dollars) of foreign
issues and in the securities of foreign branches of U.S. banks such as
negotiable certificates of deposit (Eurodollars). Because the Fund invests in
such securities, investment in the Fund involves investment risks that are
different in some respects from an investment in a fund which invests only in
debt obligations of U.S. issuers. Such risks may include future political and
economic developments, the possible imposition of withholding taxes on interest
income payable on the securities held, possible seizure or nationalization of
foreign deposits, the possible establishment of exchange controls or the
adoption or other restrictions by foreign governments which may adversely affect
the payment of principal and interest on securities held by the Fund, difficulty
in obtaining and enforcing court judgments abroad, the possibility of
restrictions on investments in other jurisdictions, reduced levels of government
regulation of securities markets in foreign countries, and difficulties in
effecting the repatriation of capital invested abroad. A Fund will not purchase
any such foreign security if, as a result, more than 20% of the value of the
Fund's total assets would be invested in such securities.
 
                              FINANCIAL STATEMENTS
 
   
     The Fund's Financial Statements for the year ended December 31, 1995,
including the financial highlights for each of the five fiscal years in the
period ended December 31, 1995, appearing in the Vanguard/Wellesley Income Fund
1995 Annual Report to Shareholders, and the report thereon of Price Waterhouse
LLP, independent accountants, also appearing therein, are incorporated by
reference in this Statement of Additional Information. The Fund's 1995 Annual
Report to Shareholders is enclosed with this Statement of Additional
Information.
    
 
                                       16
<PAGE>   59
 
                                     PART C
                      VANGUARD/WELLESLEY INCOME FUND, INC.
                               OTHER INFORMATION
 
ITEM 24. FINANCIAL STATEMENTS AND EXHIBITS
     (a) FINANCIAL STATEMENTS
 
   
     The Registrant's financial statements for the year ended December 31, 1995,
including Price Waterhouse LLP's report thereon, are incorporated by reference,
in the Statement of Additional Information, from the Registrant's 1995 Annual
Report which has been filed with the Commission. The financial statements
included in the Annual Report are:
    
 
   
     1. Statement of Net Assets as of December 31, 1995.
    
   
     2. Statement of Operations for the year ended December 31, 1995.
    
   
     3. Statement of Changes in Net Assets for the years ended December 31, 1994
        and 1995.
    
   
     4. Financial Highlights for each of the five years in the period ended
        December 31, 1995 (also appearing in the Prospectus along with previous
        years).
    
     5. Notes to Financial Statements.
     6. Report of Independent Accountants.
 
<TABLE>
<CAPTION>
<S>                <C>
(b) EXHIBITS
 Exhibit Number    Description
  1............... Articles of Incorporation**
  2............... By-Laws of Registrant**
  3............... Not Applicable
  4............... Not Applicable
  5............... Not Applicable
  6............... Not Applicable
  7............... Reference is made to the section entitled "Management of the Fund" in
                   the Registrant's Statement of Additional Information
  8............... Form of Custody Agreement**
  9............... Form of Vanguard Service Agreement**
 10............... Opinion of Counsel**
 11............... Consent of Independent Accountants*
 12............... Financial Statements--reference is made to (a) above
 13............... Not Applicable
 14............... Not Applicable
 15............... Not Applicable
 16............... Schedule for Computation of Performance Quotations*
 27............... Financial Data Schedule*
</TABLE>
 
- ------------
 *Filed herewith
**Previously filed
 
ITEM 25. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT
 
     Registrant is not controlled by or under common control with any person.
The officers of the Registrant, the investment companies in The Vanguard Group
of Investment Companies and The Vanguard Group, Inc. are identical. Reference is
made to the caption "Management of the Fund" in the Prospectus constituting Part
A and "The Vanguard Group" in the Statement of Additional Information
constituting Part B of this Registration Statement.
 
ITEM 26. NUMBER OF HOLDERS OF SECURITIES
 
   
     As of December 31, 1995 there were 310,895 shareholders.
    
 
                                       17
<PAGE>   60
 
ITEM 27. INDEMNIFICATION
 
     Reference is made to Article XI of Registrant's Articles of Incorporation.
 
     Insofar as indemnification for liability arising under the Securities Act
of 1933 may be permitted to directors, 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 director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.
 
ITEM 28. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER
 
     Reference is made to the caption "Investment Adviser" in the prospectus
constituting Part A on this Registration Statement and "Investment Advisory
Services" in Part B of this Registration Statement.
 
     Wellington Management Company, 75 State Street, Boston, Massachusetts,
02109, is a Massachusetts general partnership, of which the following persons
are managing partners: Robert W. Doran, Duncan M. McFarland and John B. Neff. No
partner has any other affiliation with the Registrant.
 
ITEM 29. PRINCIPAL UNDERWRITERS
 
     (a) None
 
     (b) Not Applicable
 
ITEM 30. LOCATION OF ACCOUNTS AND RECORDS
 
     The books, accounts and other documents required by Section 31(a) under the
Investment Company Act and the rules promulgated thereunder will be maintained
in the physical possession of Registrant; Registrant's Transfer Agent, The
Vanguard Group, Inc. c/o The Vanguard Financial Center, Valley Forge,
Pennsylvania 19482; and the Registrant's Custodian, Morgan Guaranty Trust
Company.
 
ITEM 31. MANAGEMENT SERVICES
 
     Other than the Amended and Restated Funds' Service Agreement with The
Vanguard Group, Inc. which was previously filed as Exhibit 9(c) and described in
Part B hereof under "Management of the Fund;" the Registrant is not a party of
any management-related service contract.
 
ITEM 32. UNDERTAKINGS
 
     Registrant hereby undertakes to comply with the provisions of section 16(c)
of the 1940 Act in regard to shareholders' rights to call a meeting of
shareholders for the purpose of voting on the removal of directors and to assist
in shareholder communications in such matters, to the extent required by law.
 
     Registrant hereby undertakes to provide an Annual Report to Shareholders or
prospective investors, free of charge, upon request.
 
                                       18
<PAGE>   61
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant hereby certifies that it meets
the requirements for effectiveness pursuant to paragraph (b) of Rule 485 and
duly caused this Post-Effective Amendment to this Registration Statement to be
signed on its behalf by the undersigned, thereunto duly authorized, in the Town
of Valley Forge and the Commonwealth of Pennsylvania, on the 16th day of April,
1996.
    
 
    VANGUARD/WELLESLEY INCOME FUND, INC.
 
   
BY: (Raymond J. Klapinsky) John C. Bogle*, Chairman
    
 
     Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment to the Registration Statement has been signed below by
the following persons in the capacities and on the date indicated:
 
BY: (Raymond J. Klapinsky)
   
    John C. Bogle*, Chairman of the Board and Director
    
   
    April 16, 1996
    
 
BY: (Raymond J. Klapinsky)
   
    John J. Brennan*, President, Director, and
    
   
    Chief Executive Officer
    
   
    April 16, 1996
    
 
BY: (Raymond J. Klapinsky)
    Robert E. Cawthorn*, Director
   
    April 16, 1996
    
 
BY: (Raymond J. Klapinsky)
    Barbara B. Hauptfuhrer*, Director
   
    April 16, 1996
    
 
BY: (Raymond J. Klapinsky)
    Bruce K. MacLaury*, Director
   
    April 16, 1996
    
 
BY: (Raymond J. Klapinsky)
    Burton G. Malkiel*, Director
   
    April 16, 1996
    
 
BY: (Raymond J. Klapinsky)
    Alfred M. Rankin Jr.*, Director
   
    April 16, 1996
    
 
BY: (Raymond J. Klapinsky)
    John C. Sawhill*, Director
   
    April 16, 1996
    
 
BY: (Raymond J. Klapinsky)
    James O. Welch, Jr.*, Director
   
    April 16, 1996
    
 
BY: (Raymond J. Klapinsky)
    J. Lawrence Wilson*, Director
   
    April 16, 1996
    
 
BY: (Raymond J. Klapinsky)
    Richard F. Hyland*, Treasurer and Principal
    Financial Officer and Accounting Officer
   
    April 16, 1996
    
 
*By Power of Attorney. See File Number 2-14336, January 23, 1990. Incorporated
by Reference.
<PAGE>   62
 
                               INDEX TO EXHIBITS
 
<TABLE>
<S>                                                                                    <C>
Consent of Independent Accountants...................................................  EX-99.B11
Schedule for Computation of Performance Quotations...................................  EX-99.B16
Financial Data Schedule..............................................................  EX-27
</TABLE>

<PAGE>   1
 
                                                                       EX-99.B11
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
   
     We hereby consent to the incorporation by reference in the Prospectuses and
Statement of Additional Information, constituting parts of this amended
Registration Statement on Form N-1A, of our report dated January 31, 1996
relating to the financial statements and financial highlights appearing in the
December 31, 1995 Annual Report to Shareholders of Vanguard/Wellesley Income
Fund. We also consent to the references to us under the headings "Financial
Highlights" and "General Information" in the Prospectuses and "Financial
Statements" in the Statement of Additional Information.
    
 
PRICE WATERHOUSE LLP
Philadelphia, PA
   
April 15, 1996
    

<PAGE>   1
 
                                                                       EX-99.B16
 
               SCHEDULE FOR COMPUTATION OF PERFORMANCE QUOTATIONS
                      VANGUARD/WELLESLEY INCOME FUND, INC.
 
   
1. Average Annual Total Return (As of December 31, 1995)
        P (1 + T)n = ERV
    
 
<TABLE>
<S>          <C>     <C>
     Where:  P = a hypothetical initial payment of $1,000
             T = average annual total return
             N = number of years
           ERV = ending redeemable value at the end of the period
</TABLE>
 
   
<TABLE>
    <C>          <S>
    EXAMPLE:
      One Year
      --------
           P =   $1,000
           T =   +28.91%
           N =   1 yr.
         ERV =   $1,289.10
     Five Year
     ---------
           P =   $1,000
           T =   +13.29%
           N =   5 yrs.
         ERV =   $1,865.94
      Ten Year
      --------
           P =   $1,000
           T =   +11.93%
           N =   10 yrs.
         ERV =   $3,087.47
</TABLE>
    
 
   
2. YIELD (30 Days Ended December 31, 1995)
    
 
<TABLE>
           <C>              <S>      <C>
                            a - b
                            -----
                Yield = 2[( c X d    + 1)(6) - 1]
</TABLE>
 
   
<TABLE>
    <C>          <S>
        Where:   a = dividends and interest paid during the period
                 b = expense dollars during the period (net of reimbursements)
                 c = the average daily number of shares outstanding during the period
                 d = the maximum offering price per share on the last day of the period
    Example     a = $34,544,731.45
                b = $1,650,008.09
                c = 344,986,179.919
                d = $20.44
            Yield = 5.66%
</TABLE>
    

<TABLE> <S> <C>

<ARTICLE> 6
<RESTATED>
<CIK> 0000105544
<NAME> VANGUARD/WELLESLEY INCOME FUND, INC.
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-START>                             JAN-01-1995
<PERIOD-END>                               DEC-31-1995
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          6342875
<INVESTMENTS-AT-VALUE>                         7132459
<RECEIVABLES>                                   145779
<ASSETS-OTHER>                                     820
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 7279058
<PAYABLE-FOR-SECURITIES>                         11668
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        86654
<TOTAL-LIABILITIES>                              98322
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       6348207
<SHARES-COMMON-STOCK>                           351262
<SHARES-COMMON-PRIOR>                           333157
<ACCUMULATED-NII-CURRENT>                        11952
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          30993
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        789584
<NET-ASSETS>                                   7180736
<DIVIDEND-INCOME>                               111108
<INTEREST-INCOME>                               292762
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   21765
<NET-INVESTMENT-INCOME>                         382105
<REALIZED-GAINS-CURRENT>                        141798
<APPREC-INCREASE-CURRENT>                      1096772
<NET-CHANGE-FROM-OPS>                          1620675
<EQUALIZATION>                                      71
<DISTRIBUTIONS-OF-INCOME>                       383294
<DISTRIBUTIONS-OF-GAINS>                         95611
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          51153
<NUMBER-OF-SHARES-REDEEMED>                      54185
<SHARES-REINVESTED>                              21137
<NET-CHANGE-IN-ASSETS>                         1500109
<ACCUMULATED-NII-PRIOR>                          13070
<ACCUMULATED-GAINS-PRIOR>                      (15194)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             4349
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  22198
<AVERAGE-NET-ASSETS>                           6414167
<PER-SHARE-NAV-BEGIN>                            17.05
<PER-SHARE-NII>                                   1.13
<PER-SHARE-GAIN-APPREC>                           3.68
<PER-SHARE-DIVIDEND>                              1.14
<PER-SHARE-DISTRIBUTIONS>                         0.28
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              20.44
<EXPENSE-RATIO>                                   0.35
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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