VANGUARD BALANCED INDEX FUND INC
485APOS, 2000-07-26
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    FORM N-1A

     REGISTRATION STATEMENT (NO. 33-48863) UNDER THE SECURITIES ACT OF 1933

                           PRE-EFFECTIVE AMENDMENT NO.


                        POST-EFFECTIVE AMENDMENT NO. 14



                                       AND

        REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940



                                AMENDMENT NO. 16




                          VANGUARD BALANCED INDEX FUND
        (EXACT NAME OF REGISTRANT AS SPECIFIED IN DECLARATION OF TRUST)

                     P.O. BOX 2600, VALLEY FORGE, PA 19482
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)

                  REGISTRANT'S TELEPHONE NUMBER (610) 669-1000

                           R. GREGORY BARTON, ESQUIRE
                                  P.O. BOX 876
                             VALLEY FORGE, PA 19482

                 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
  AS SOON AS PRACTICABLE AFTER THIS REGISTRATION STATEMENT BECOMES EFFECTIVE.

               IT IS PROPOSED THAT THIS FILING BECOME EFFECTIVE:


            ON JULY 26, 2000, PURSUANT TO PARAGRAPH (A) OF RULE 485.



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                                                    VANGUARD (R)
                                                    BALANCED INDEX
                                                    FUND

                                                    Prospectus

                                                    September ., 2000






This prospectus  contains
financial data for the
Fund for the six-
months ended
June 30, 2000.



                                                    [A Member of
                                                    The Vanguard Group(R)]

<PAGE>

VANGUARD BALANCED INDEX FUND
Prospectus


September ., 2000


A Balanced Mutual Fund


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CONTENTS

  1 FUND PROFILE                          16 FINANCIAL HIGHLIGHTS

  4 ADDITIONAL INFORMATION                18 INVESTING WITH VANGUARD

  4 AN INTRODUCTION TO INDEX FUNDS           18 Buying Shares

  5 A WORD ABOUT RISK                        19 Converting Shares

  5 WHO SHOULD INVEST                        20 Redeeming Shares

  6 PRIMARY INVESTMENT STRATEGIES            22 Other Rules You Should Know

  12 THE FUND AND VANGUARD                   24 Fund and Account Updates

  13 INVESTMENT ADVISER                      25 Contacting Vanguard

  14 DIVIDENDS, CAPITAL GAINS, AND TAXES  GLOSSARY (inside back cover)

  16 SHARE PRICE
--------------------------------------------------------------------------------


--------------------------------------------------------------------------------
 WHY READING THIS PROSPECTUS IS IMPORTANT
 This  prospectus  explains the  objective,  risks,  and  strategies of Vanguard
 Balanced Index Fund. To highlight  terms and concepts  important to mutual fund
 investors,  we have  provided  "Plain  Talk(R)"  explanations  along the way.
 Reading the  prospectus  will help you to decide  whether the Fund is the right
 investment for you. We suggest that you keep it for future reference.
--------------------------------------------------------------------------------


NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR  DISAPPROVED  OF THESE  SECURITIES OR PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

<PAGE>

                                                                               1

FUND PROFILE


INVESTMENT OBJECTIVE
The Fund seeks to provide  current  income  and  long-term  growth of income and
capital.


INVESTMENT STRATEGIES
The Fund typically  invests 60% of its assets in common stocks and 40% in bonds.
The stock  portion of the Fund seeks to match the total  return of the  Wilshire
5000 Total Market Index, a widely recognized  measure for the U.S. stock market.
The Fund's bond portion  seeks to replicate  the returns of the Lehman  Brothers
Aggregate  Bond Index,  a measure of  regularly  traded,  U.S.  investment-grade
bonds.


PRIMARY RISKS
THE FUND'S TOTAL RETURN,  LIKE STOCK AND BOND PRICES  GENERALLY,  WILL FLUCTUATE
WITHIN A WIDE  RANGE,  SO AN  INVESTOR  COULD LOSE MONEY OVER SHORT OR EVEN LONG
PERIODS. The Fund is also subject to:

o    Stock  market  risk,  which is the chance that stock prices in general will
     decline  over  short or even long  periods.  The stock  market  tends to be
     cyclical,  with periods when stock prices  generally  rise and periods when
     stock prices generally decline.
o    Interest  rate risk,  which is the chance  that bond  prices  overall  will
     decline  over  short or even long  periods  due to rising  interest  rates.
     Interest rate risk should be moderate for the Fund.
o    Income risk, which is the chance that falling interest rates will cause the
     Fund's income to decline. Income risk should be moderate for the Fund.
o    Credit  risk,  which is the  chance  that a bond  issuer  will  fail to pay
     interest and  principal  in a timely  manner,  reducing the Fund's  return.
     Credit risk should be low for the Fund.
o    Prepayment  risk,  which is the  chance  that  during  periods  of  falling
     interest rates, a mortgage-backed  bond issuer will repay a higher-yielding
     bond before its maturity date because the  underlying  mortgages  have been
     paid off ahead of  schedule.  If a bond is called,  the Fund would lose the
     opportunity  for  additional  price  appreciation,  and  would be forced to
     reinvest the  unanticipated  proceeds at lower interest rates. As a result,
     the Fund would experience a decline in income.
o    Index sampling risk,  which is the chance that the securities  selected for
     the Fund  will not  provide  investment  performance  matching  that of the
     index. Index sampling risk for the Fund should be low.


PERFORMANCE/RISK INFORMATION


The bar chart and table below  provide an indication of the risk of investing in
the Fund. The bar chart shows the Fund's performance in each calendar year since
inception.  The table shows how the Fund's  average annual total returns for one
and five calendar  years and since  inception  compare to those of a broad-based
securities  market index.  Both the bar chart and the table present  information
for the Fund's  Investor  Shares;  the Fund's  Admiral Shares were not available
during the time  periods  shown.  Keep in mind that the Fund's past  performance
does not necessarily indicate how it will perform in the future.


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2


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                     ANNUAL TOTAL RETURNS-INVESTOR SHARES
--------------------------------------------------------------------------------
                                 1993      10.00%
                                 1994      -1.56%
                                 1995      28.64%
                                 1996      13.95%
                                 1997      22.24%
                                 1998      17.85%
                                 1999      13.61%
--------------------------------------------------------------------------------
Total return figures do not reflect the annual account  maintenance  fee of $10.
The Fund's  year-to-date  return as of the calendar quarter ended June 30, 2000,
was .%.
--------------------------------------------------------------------------------


 During the period  shown in the bar chart,  the  highest  return for a calendar
quarter was 12.67% (quarter ended December 31, 1998) and the lowest return for a
quarter was -5.57% (quarter ended September 30, 1998).




--------------------------------------------------------------------------------
       AVERAGE ANNUAL TOTAL RETURNS FOR YEARS ENDED DECEMBER 31, 1999
--------------------------------------------------------------------------------
                                                                    SINCE
                                         1 YEAR      5 YEARS      INCEPTION*
--------------------------------------------------------------------------------
      Vanguard Balanced Index
       Fund-Investor Shares**           13.61%       19.13%         14.89%
      Balanced Composite Index+         13.54        19.30          15.19
      Wilshire 5000 Index               23.77        27.11          20.92
      Lehman Brothers Aggregate Bond    -0.82         7.73           6.57
       Index
--------------------------------------------------------------------------------
       *November 9, 1992.
      **Total return figures do not reflect the annual account  maintenance  fee
       of $10. +Made up of two unmanaged benchmarks,  weighted 60% Wilshire 5000
       Index and 40% Lehman Brothers Aggregate Bond Index.
--------------------------------------------------------------------------------


FEES AND EXPENSES


The following  table  describes the fees and expenses you may pay if you buy and
hold Investor  Shares or Admiral  Shares of the Fund.  The expenses  shown under
Annual Fund  Operating  Expenses  for  Investor  Shares are based upon  expenses
incurred for  Investor  Shares in the fiscal year ended  December 31, 1999;  for
Admiral Shares the expenses are estimates for the current fiscal year.



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                                                                               3


                                                      INVESTOR        ADMIRAL
                                                        SHARES         SHARES
                                                ----------------     ----------
SHAREHOLDER FEES (fees paid directly from your investment)

Sales Charge (Load) Imposed on Purchases:                 None           None
Transaction Fee on Purchases:                             None           None
Sales Charge (Load) Imposed on Reinvested                 None           None
Dividends:
Redemption Fee:                                           None           None
Exchange Fee:                                             None           None
Account Maintenance Fee (for accounts under             $2.50/           None
$10,000):                                             quarter*

ANNUAL FUND OPERATING EXPENSES (expenses deducted from the Fund's assets)
Management Expenses:                                     0.17%          0.12%
12b-1 Distribution Fee:                                   None           None
Other Expenses:                                          0.03%          0.03%
 TOTAL ANNUAL FUND OPERATING EXPENSES:                   0.20%          0.15%


    *The  account   maintenance   fee  will  be  deducted  from  your  quarterly
    distribution of the Fund's dividends.  If your distribution is less than the
    fee,  fractional  shares  will  be  automatically  redeemed  to  make up the
    difference.

 The Fund  reserves  the  right to  deduct a  transaction  fee of 0.08%  from an
investor's cumulative purchases over $100 million.  Where it applies, the fee is
retained  by the  Fund to  offset  transaction  costs  of  investing  large  new
contributions  into the  market.  The fee is not paid to  Vanguard  and is not a
sales charge.



--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  FUND EXPENSES
All mutual funds have operating  expenses.  These  expenses,  which are deducted
from a fund's gross income or assets,  are  expressed as a percentage of the net
assets of the fund.  Vanguard  Balanced  Index Fund's  Investor  Shares had an -
expense  ratio of 0.20% in fiscal  year 1999,  or $2 per  $1,000 of average  net
assets.  It is estimated  that the Fund's Admiral Shares will have an annualized
expense  ratio of 0.15% for the  current  fiscal  year,  or $1.50 per  $1,000 of
average net assets.  The average  balanced  mutual fund had  expenses in 1999 of
1.33%, or $13.30 per $1,000 of average net assets (derived from data provided by
Lipper Inc.,  which reports on the mutual fund industry).  Management  expenses,
which are one part of operating  expenses,  include investment  advisory fees as
well as other costs of managing a fund--such as account maintenance,  reporting,
accounting, legal, and other administrative expenses.
--------------------------------------------------------------------------------

 The following  example is intended to help you compare the cost of investing in
the Fund's Investor Shares or Admiral Shares with the cost of investing in other
mutual funds. It illustrates the hypothetical expenses that you would incur over
various periods if you invest $10,000 in the Fund. This example assumes that the
Fund provides a return of 5% a year, and that operating expenses remain the same
for Investor Shares and match our estimates for Admiral Shares. The results
apply whether or not you redeem your investment at the end of each period.



<PAGE>

4


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                   1 YEAR           3 YEARS         5 YEARS     10 YEARS
--------------------------------------------------------------------------------
Investor Shares     $20             $64             $113        $255
Admiral Shares      $.              $.              $.          $.
--------------------------------------------------------------------------------


 THIS  EXAMPLE  SHOULD  NOT  BE  CONSIDERED  TO  REPRESENT  ACTUAL  EXPENSES  OR
PERFORMANCE  FROM THE PAST OR FOR THE  FUTURE.  ACTUAL  FUTURE  EXPENSES  MAY BE
HIGHER OR LOWER THAN THOSE SHOWN.


--------------------------------------------------------------------------------
ADDITIONAL INFORMATION

DIVIDENDS AND CAPITAL GAINS            CONVERSION FEATURES
Dividends are distributed quarterly
in March, June, September, and         Investor Shares--Optional conversion to
December; capital gains, if any, are   Admiral Shares for investors registered
distributed annually in December       with vanguard.com if account balance is
                                       at least $150,000 after three years or
                                       $50,000 after ten years
                                       Admiral Shares--Automatic conversion to
INVESTMENT ADVISER                     Investor Shares if no longer eligible
The Vanguard Group, Valley Forge,      for Admiral Shares
Pa.,
since inception
                                       NEWSPAPER ABBREVIATION
INCEPTION DATE                         .
Investor Shares-November 9, 1992
Admiral Shares-September ., 2000       VANGUARD FUND NUMBER
               (Expected)              .

NET ASSETS (INVESTOR SHARES) AS OF     CUSIP NUMBER
JUNE 30, 2000                          .
$. billion

SUITABLE FOR IRAS                      TICKER SYMBOL
Yes                                    .


MINIMUM INITIAL INVESTMENT
Investor Shares--$3,000; $1,000 for
IRAs and custodial accounts for
minors
Admiral Shares--$250,000
--------------------------------------------------------------------------------


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

                                PLAIN TALK ABOUT
                             THE COSTS OF INVESTING
Costs are an important  consideration in choosing a mutual fund.  That's because
you, as a shareholder,  pay the costs of operating a fund,  plus any transaction
costs  associated with the fund's buying and selling of securities.  These costs
can erode a substantial  portion of the gross income or capital  appreciation  a
fund may achieve.  Even seemingly small  differences in expenses can, over time,
have a dramatic effect on a fund's performance.
--------------------------------------------------------------------------------



AN INTRODUCTION TO INDEX FUNDS

WHAT IS INDEXING?

An index is an unmanaged group of securities  whose overall  performance is used
as a standard to measure the investment  performance of a particular  market. An
index (or "passively managed") fund tries to match, as closely as possible,  the
performance of an established  target index.  The fund does this by holding all,
or a representative sample, of the securities that comprise the index.

 The target index may be a group of stocks or bonds,  or a combination of stocks
and bonds. Balanced index funds hold a mix of stocks and bonds.


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                                                                               5

 Index funds do not have active  managers who buy and sell  securities  based on
research and analysis.  Rather, index funds are passively managed by the adviser
who seeks to match a market benchmark.

WHY INVEST IN INDEX FUNDS?

Index funds appeal to many investors for a number of reasons:
o    Variety of  investments.  Vanguard index funds  generally  invest in a wide
     variety of companies and industries.

o    Relative  performance  consistency.  Because  they  seek  to  track  market
     benchmarks,  index  funds by  definition  should not  perform  dramatically
     better or worse than their benchmarks.
o    Low cost.  Index funds are  inexpensive  to run as compared  with  actively
     managed funds.  They have lower  research costs and keep trading  activity,
     and thus trading costs, to a minimum.


 KEEP IN MIND THAT AN INDEX FUND HAS OPERATING EXPENSES AND TRANSACTION COSTS; A
MARKET INDEX DOES NOT.  THEREFORE,  AN INDEX  FUND--WHILE  EXPECTED TO TRACK ITS
TARGET  INDEX AS  CLOSELY  AS  POSSIBLE--WILL  TYPICALLY  BE UNABLE TO MATCH THE
PERFORMANCE OF THE INDEX EXACTLY.

--------------------------------------------------------------------------------
A WORD ABOUT RISK

This  prospectus  describes  risks you would  face as an  investor  in  Vanguard
Balanced  Index Fund.  It is important to keep in mind one of the main axioms of
investing: The higher the risk of losing money, the higher the potential reward.
The  reverse,  also,  is  generally  true:  The lower  the  risk,  the lower the
potential  reward.  As you consider an investment  in the Fund,  you should also
take into account your  personal  tolerance  for the daily  fluctuations  of the
stock and bond markets.
     Look for this [FLAG] symbol  throughout the prospectus.  It is used to mark
detailed  information  about  each  type of risk that you  would  confront  as a
shareholder of the Fund.
--------------------------------------------------------------------------------

WHO SHOULD INVEST

The Fund may be a suitable investment for you if:


o    You are seeking  moderate current income and long-term growth of income and
     capital.

o    You are seeking a diversified combination of U.S. stocks and bonds.
o    You are willing to invest for the long term--at least five years.


<PAGE>

6

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                                PLAIN TALK ABOUT
                             COSTS AND MARKET-TIMING
 Some  investors  try  to  profit  from   market-timing--switching   money  into
 investments  when they expect  prices to rise,  and taking  money out when they
 expect  the  market to fall.  As money is  shifted  in and out,  a fund  incurs
 expenses for buying and selling  securities.  These costs are borne by all fund
 shareholders,  including the long-term investors who do not generate the costs.
 Therefore,  the Fund  discourages  short-term  trading by, among other  things,
 limiting the number of exchanges it permits.
--------------------------------------------------------------------------------

 THE VANGUARD FUNDS DO NOT PERMIT MARKET-TIMING. DO NOT INVEST IN THIS FUND IF
YOU ARE A MARKET-TIMER.

The Fund has adopted the following policies,  among others, to discourage short-
term   trading:

o    The Fund  reserves  the right to  reject  any  purchase  request--including
     exchanges from other  Vanguard  funds--that it regards as disruptive to the
     efficient  management  of the Fund.  A purchase  request  could be rejected
     because  of the  timing  of the  investment  or  because  of a  history  of
     excessive trading by the investor.

o    Telephone  and online  exchanges  generally  are not  accepted  for non-IRA
     accounts.

o    There is a limit on the  number of times you can  exchange  into and out of
     the Fund (see "Redeeming Shares" in the INVESTING WITH VANGUARD section).
o    The Fund reserves the right to stop offering shares at any time.

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                 BALANCED FUNDS
 Balanced  funds are  generally  "middle of the road"  investments  that seek to
 provide some  combination of growth,  income,  and  conservation  of capital by
 investing in a mix of stocks,  bonds, and/or money market instruments.  Because
 the prices of stocks and bonds  often move in  different  directions,  balanced
 funds are able to use rewards  from one type of  investment  to help offset the
 risks from another.
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PRIMARY INVESTMENT STRATEGIES


This section explains the strategies that the investment adviser uses in pursuit
of the  Fund's  objective--current  income  and  long-term  growth of income and
capital.  It also  explains  how the adviser  implements  these  strategies.  In
addition,  this section discusses several  important  risks--stock  market risk,
interest rate risk,  income risk,  credit risk,  and  prepayment  risk--faced by
investors  in the  Fund.  The  Fund's  Board of  Trustees,  which  oversees  the
management of the Fund, may change the Fund's investment objective or strategies
in the interest of shareholders, without a shareholder vote.


MARKET EXPOSURE

STOCKS


About 60% of the Fund's assets are invested in common  stocks,  in an attempt to
replicate with that portion of the assets the performance of the Wilshire 5000
Index.



<PAGE>
                                                                               7

[FLAG] THE FUND IS SUBJECT TO STOCK MARKET RISK,  WHICH IS THE CHANCE THAT STOCK
PRICES OVERALL WILL DECLINE OVER SHORT OR EVEN LONG PERIODS.  STOCK MARKETS TEND
TO MOVE IN CYCLES, WITH PERIODS OF RISING PRICES AND PERIODS OF FALLING PRICES.


 To illustrate  the  volatility of stock prices,  the following  table shows the
best,  worst,  and average total returns for the U.S.  stock market over various
periods as measured by the Standard & Poor's 500 Index,  a widely used barometer
of market  activity.  (Total returns  consist of dividend  income plus change in
market  price.)  Note that the returns  shown do not include the costs of buying
and selling  stocks or other  expenses  that a real-world  investment  portfolio
would  incur.  Note,  also,  that the gap between best and worst tends to narrow
over the long term.



--------------------------------------------------------------------------------
                            U.S. STOCK MARKET RETURNS (1926-1999)
--------------------------------------------------------------------------------
                 1 YEAR         5 YEARS      10 YEARS    20 YEARS
--------------------------------------------------------------------------------

Best              54.2%         28.6%        19.9%       17.9%
Worst            -43.1         -12.4         -0.9         3.1
Average           13.2          11.0         11.1        11.1
--------------------------------------------------------------------------------


 The table covers all of the 1-, 5-, 10-, and 20-year  periods from 1926 through
1999.  You can see, for example,  that while the average return on common stocks
for all of the 5-year periods was 11.0%,  returns for individual  5-year periods
ranged  from a -12.4%  average  (from  1928  through  1932) to 28.6%  (from 1995
through 1999).  These average returns reflect past performance on common stocks;
you should not regard them as an  indication  of future  returns from either the
stock market as a whole or this Fund in particular,  which invests approximately
40% of its assets in bonds.

 While the Fund's holdings will typically  include the 500 largest stocks in the
Wilshire 5000 Index,  they will not include all of the  securities in the Index.
Instead, the Fund will invest in a representative sample of stocks.

 Keep in mind, too, that while the Wilshire 5000 Index is dominated by large-cap
stocks  (those  contained in the S&P 500 Index),  small- and mid-cap  issues are
also  represented.  The Fund's stock holdings are adjusted on a regular basis to
reflect the Wilshire  5000 Index.  As of December 31, 1999,  about 22.16% of the
market value of the Wilshire 5000 Index was  comprised of  securities  that were
not in the S&P 500 Index.  Stocks of smaller  companies have  historically  been
more volatile  than--and at times have  performed  quite  differently  from--the
stocks of larger companies.


--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                   LARGE-CAP, MID-CAP, AND SMALL-CAP STOCKS
 Stocks  of  publicly  traded   companies--and  mutual  funds  that  hold  these
 stocks--can be classified by the companies'  market value,  or  capitalization.
 Market capitalization  changes over time, and there is no "official" definition
 of the boundaries of large-,  mid-, and small-cap  stocks.  Vanguard  generally
 defines  large-capitalization  (large-cap)  funds as those  holding  stocks  of
 companies whose  outstanding  shares have a market value exceeding $12 billion;
 mid-cap funds as those holding  stocks of companies with a market value between
 $1 billion and $12 billion;  and  small-cap  funds as those  typically  holding
 stocks  of  companies  with a market  value of less than $1  billion.  Vanguard
 periodically reassesses these classifications.
--------------------------------------------------------------------------------


<PAGE>

8

BONDS

About 40% of the Fund's  assets are invested in bonds in an attempt to replicate
with that portion of the assets the performance of the Lehman Brothers Aggregate
Bond Index.

[FLAG] THE FUND IS SUBJECT TO INTEREST RATE RISK,  WHICH IS THE CHANCE THAT BOND
PRICES  OVERALL  WILL  DECLINE  OVER  SHORT OR EVEN LONG  PERIODS  DUE TO RISING
INTEREST  RATES.  INTEREST  RATE RISK SHOULD BE MODERATE FOR  SHORTER-TERM  BOND
FUNDS  AND HIGH FOR  LONGER-TERM  BOND  FUNDS.  BECAUSE  THE FUND  INVESTS  IN A
PORTFOLIO OF BONDS WITH AN INTERMEDIATE AVERAGE MATURITY (5-10 YEARS),  INTEREST
RATE RISK IS MODERATE.


--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                            BONDS AND INTEREST RATES
 As a rule,  when interest  rates rise,  bond prices fall.  The opposite is also
 true:  Bond  prices go up when  interest  rates  fall.  Why do bond  prices and
 interest rates move in opposite  directions?  Let's assume that you hold a bond
 offering a 5% yield. A year later, interest rates are on the rise and bonds are
 offered with a 6% yield. With higher-yielding  bonds available,  you would have
 trouble selling your 5% bond for the price you  paid--causing you to lower your
 asking price.  On the other hand,  if interest  rates were falling and 4% bonds
 were being  offered,  you should be able to sell your 5% bond for more than you
 paid.
--------------------------------------------------------------------------------

 Although bonds are often thought to be less risky than stocks,  there have been
periods when bond prices have fallen significantly due to rising interest rates.
For instance, prices of long-term bonds fell by almost 48% between December 1976
and September 1981.

 To  illustrate  the  volatility of bond prices,  the following  table shows the
effect of both a 1% and a 2%  change  (both up and  down) in  interest  rates on
three bonds of different maturities, each with a face value of $1,000.

--------------------------------------------------------------------------------
                      HOW INTEREST RATE CHANGES AFFECT THE
                             VALUE OF A $1,000 BOND*
--------------------------------------------------------------------------------
                              AFTER A 1%   AFTER A 1%   AFTER A 2%    AFTER A 2%
TYPE OF BOND (MATURITY)        INCREASE     DECREASE     INCREASE      DECREASE
--------------------------------------------------------------------------------
Short-Term (2.5 years)           $978        $1,023        $956         $1,046
Intermediate-Term (10 years)      932         1,074         870          1,156
Long-Term (20 years)              901         1,116         816          1,251
--------------------------------------------------------------------------------
*Assuming a 7% yield.
--------------------------------------------------------------------------------

 These  figures  are for  illustration  only and  should not be  regarded  as an
indication  of  future  returns  from the bond  market as a whole or the Fund in
particular.

 Changes in interest rates will affect bond income as well as bond prices.

[FLAG]  THE FUND IS SUBJECT TO INCOME  RISK,  WHICH IS THE CHANCE  THAT A FUND'S
DIVIDENDS  (INCOME) WILL DECLINE DUE TO FALLING  INTEREST RATES.  INCOME RISK IS
GENERALLY THE GREATEST FOR  SHORT-TERM  BOND FUNDS,  AND THE LEAST FOR LONG-TERM
BOND FUNDS.


<PAGE>
                                                                               9

[FLAG]  BECAUSE  IT  INVESTS IN  MORTGAGE-BACKED  BONDS,  THE FUND IS SUBJECT TO
PREPAYMENT  RISK,  WHICH IS THE CHANCE THAT DURING  PERIODS OF FALLING  INTEREST
RATES, A MORTGAGE-BACKED  BOND ISSUER WILL "CALL"--OR  REPAY--A  HIGHER-YIELDING
BOND  BEFORE ITS  MATURITY  DATE.  IF A BOND IS CALLED,  THE FUND WOULD LOSE THE
OPPORTUNITY FOR ADDITIONAL PRICE  APPRECIATION,  AND WOULD BE FORCED TO REINVEST
THE UNANTICIPATED PROCEEDS AT A LOWER INTEREST RATE. AS A RESULT, THE FUND WOULD
EXPERIENCE A DECLINE IN INCOME.

 Since the Fund invests only a portion of its assets in  mortgage-backed  bonds,
the risk to the Fund is limited.


[FLAG]  THE FUND IS  SUBJECT TO CREDIT  RISK,  WHICH IS THE  CHANCE  THAT A BOND
ISSUER WILL FAIL TO PAY INTEREST AND PRINCIPAL IN A TIMELY MANNER.


 The credit  quality of the Fund is  expected  to be very high,  and thus credit
risk should be low. The weighted  average credit quality of the Fund's holdings,
as rated by Moody's Investors Service, as of June 30, 2000, was ..


 To a limited  extent,  the Fund is also  exposed  to event  risk,  which is the
chance  that  corporate  fixed-income  securities  held by the Fund may suffer a
substantial  decline  in credit  quality  and  market  value due to a  corporate
restructuring or other corporate event.

 Finally, because stock and bond prices often move in different directions,  the
Fund's bond holdings help to dampen--but not eliminate--some of the stock market
volatility experienced by the Fund. Likewise,  changes in interest rates may not
have as  dramatic an effect on the Fund as they would on a fund made up entirely
of bonds.

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                 BOND MATURITIES
 A bond is issued with a specific maturity  date--the date when the bond issuer,
 or seller,  must pay back the bond's initial value (known as its "face value").
 Bond  maturities  generally  range from less than one year  (short-term)  to 30
 years (long-term).  The longer a bond's maturity,  the more risk you, as a bond
 investor,  face as interest  rates  rise--but  also the more interest you could
 receive.  Long-term  bonds are more  suitable  for  investors  willing  to take
 greater risks in hopes of higher yields;  short-term  bond investors  should be
 willing to accept lower yields in return for less  fluctuation  in the value of
 their investment.
--------------------------------------------------------------------------------


SECURITY SELECTION

INDEXING METHODS

In  seeking  to track a  particular  index,  a fund may use one of two  indexing
methods to select the stocks or bonds in which it invests.

 Some index funds hold each stock or bond found in their target indexes in about
the same proportions as represented in the indexes  themselves.  For example, if
5% of the S&P 500 Index were made up of the stock of a specific company,  a fund
tracking that index would invest about 5% of its assets in that company.

 Other index funds may use a different  selection  process.  Because it would be
impractical to buy and sell all of the  securities  represented by an index (the
Wilshire 5000 Index, for example, included more than 7,000 stocks as of December
31, 1999), many funds tracking


<PAGE>

10

these larger indexes use a "sampling" technique.  Using a sophisticated computer
program,  these funds select  securities that will recreate their target indexes
in terms of industry,  size, and other characteristics.  For instance, if 10% of
the Wilshire 5000 Index were made up of utility stocks,  the Balanced Index Fund
would  allocate  about 10% of its stock  investment to the utility stocks of the
index with similar characteristics.

[FLAG] THE FUND IS SUBJECT TO INDEX SAMPLING RISK,  WHICH IS THE CHANCE THAT THE
SECURITIES SELECTED WILL NOT PROVIDE INVESTMENT PERFORMANCE MATCHING THAT OF THE
TARGET INDEXES. INDEX SAMPLING RISK SHOULD BE LOW.

STOCKS

The Fund's common stock portfolio is designed to have investment characteristics
that  parallel  those  of the  Wilshire  5000  Index.  The Fund is  expected  to
replicate  approximately  1,000 of the largest  securities  in the Wilshire 5000
Index as measured by market capitalization,  plus a representative sample of the
remainder,  which are selected primarily on the basis of market  capitalization,
industry weightings, and other fundamental characteristics.  Typically, the Fund
holds a total of between 3,000 and 3,500 stocks.

BONDS

The Fund's bond portfolio is designed to have  investment  characteristics  that
parallel   those  of  the  Lehman   Brothers   Aggregate  Bond  Index,  a  broad
market-weighted  index that encompasses  five major classes of  investment-grade
fixed-income   securities  in  the  United  States:  U.S.  Treasury  and  agency
securities,   corporate   bonds,   mortgage-backed   securities,   international
dollar-denominated  bonds, and asset-backed  securities with maturities  greater
than one year. The Fund will invest in a  representative  sample of fixed-income
securities  in the  index,  which,  taken  together,  are  expected  to  perform
similarly to the index.  These  securities are described  further as follows:

o    U.S.  government  securities  include U.S. Treasury and agency bonds, which
     represent  loans by an investor to the U.S.  Treasury  Department or a wide
     variety of governmental agencies and  instrumentalities.  Timely payment of
     principal  and interest on these bonds is  guaranteed by the full faith and
     credit of the U.S. government; some agency bonds have the same guarantee.
o    Corporate bonds are IOUs issued by businesses that want to borrow money for
     some  purpose--often to develop a new product or service,  to expand into a
     new market,  or to buy another  company.  As with other types of bonds, the
     issuer  promises  to repay the  principal  on a  specific  date and to make
     interest  payments in the meantime.  The amount of interest offered depends
     both on market  conditions and on the financial  health of the  corporation
     issuing the bonds; a company whose credit rating is not strong will have to
     offer a relatively high interest rate to obtain buyers for its bonds.
o    Mortgage-backed  securities  represent  interests  in  underlying  pools of
     mortgages.  Unlike  ordinary  bonds,  which  generally  pay a fixed rate of
     interest  at regular  intervals  and then repay  principal  upon  maturity,
     mortgage-backed  bonds pay both  interest  and  principal  as part of their
     regular payments. Because the mortgages underlying the bonds can be prepaid
     at any time by homeowners or corporate borrowers, mortgage-backed bonds are
     subject to prepayment risk, as discussed earlier in this prospectus.  These
     types of bonds are issued by a number of government agencies, including the
     Government  National  Mortgage  Association  (GNMA),  often  referred to as
     "Ginnie  Mae," the Federal  Home Loan  Mortgage  Corporation  (FHLMC),  the
     Federal National Mortgage Association


<PAGE>

                                                                              11

     (FNMA),  often  referred  to as  "Fannie  Mae,"  and  the  Federal  Housing
     Authority (FHA).  GNMA bonds are guaranteed by the full faith and credit of
     the U.S.  government  as to the timely  payment of principal  and interest;
     bonds  issued by other  government  agencies are not.  (Note:  The Balanced
     Index  Fund may also  invest in  conventional  mortgage-backed  securities,
     which are packaged by private  corporations  and are not  guaranteed by the
     U.S. government.)
o    International  dollar-denominated  bonds  are  bonds  denominated  in  U.S.
     dollars issued by foreign  governments  and  companies.  Because the bond's
     value is designated in dollars  rather than in the currency of the issuer's
     country,  the investor is not exposed to currency risk;  rather, the issuer
     assumes the risk, usually to attract U.S. investors.
o    Asset-backed  securities  are bonds backed by an underlying  pool of assets
     such as automobile loans,  credit card loans, and home equity loans.  These
     securities are structured  with varying  amounts of credit risk,  depending
     primarily  on the  quality of the  underlying  assets.  They are  generally
     issued  by  private  corporations  and  are  not  guaranteed  by  the  U.S.
     government.  Asset-backed bonds are subject to prepayment risk as discussed
     earlier in this prospectus.

     In "sampling" its target index,  the Fund has the flexibility to overweight
particular types of bonds relative to their  representation  in the index.  This
normally involves substituting  corporate bonds for government bonds of the same
maturity.  The corporate  substitution strategy increases the Fund's income, but
also marginally increases exposure to credit risk, which is explained on page 9.
The Fund limits corporate  substitutions to bonds with less than approximately 4
years' remaining  maturity,  and the Fund will limit corporate  substitutions to
approximately 15% of its net assets.
 The Fund is generally managed without regard to tax ramifications.


TURNOVER RATE

Although the Fund  generally  seeks to invest for the long term,  it retains the
right to sell  securities  regardless of how long the securities have been held.
The Fund's average  turnover rate for the past five years has been about 25%. (A
turnover  rate of 100% would occur,  for example,  if the Fund sold and replaced
securities valued at 100% of its total net assets within a one-year period.)


--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  TURNOVER RATE
Before  investing in a mutual fund,  you should review its turnover  rate.  This
gives an  indication  of how  transaction  costs could affect the fund's  future
returns.  In general,  the greater the volume of buying and selling by the fund,
the greater the impact that brokerage  commissions and other  transaction  costs
will have on its return. Also, funds with high turnover rates may be more likely
to generate  capital gains that must be  distributed to  shareholders  as income
subject  to  taxes.  As of June 30,  2000,  the  average  turnover  rate for all
domestic   hybrid  funds  (a  category   that  includes   balanced   funds)  was
approximately .%, according to Morningstar, Inc.
--------------------------------------------------------------------------------


ACCOUNT MAINTENANCE FEE

Vanguard assesses an account  maintenance fee on index fund  shareholders  whose
account  balances are below $10,000 (for any reason,  including a decline in the
value of the Fund's shares) on the date a dividend is  distributed.  This fee is
intended to allocate the costs of  maintaining  accounts  more  equitably  among
shareholders. The account


<PAGE>

12

maintenance  fee is $2.50 per quarter,  deducted  from the  quarterly  dividend,
which usually is distributed during the last two weeks of each calendar quarter.
If the fee is deducted from your dividend distribution,  you will still be taxed
on the full  amount of your  dividend  (unless  you hold your  shares  through a
nontaxable  account).  If you are due a  dividend  that is less  than  the  fee,
fractional shares will be automatically redeemed to make up the difference. This
fee cannot be prepaid.

OTHER INVESTMENT POLICIES AND RISKS

Besides  investing in U.S.  common  stocks and bonds,  the Fund may make certain
other  kinds of  investments  to achieve its  objective.  The Fund may invest in
fixed-income  securities not in the target index  (non-public,  investment grade
securities--generally  referred to as 144A securities--as well as smaller public
issues or medium term notes not  included in the index due to their  size).  The
vast majority of these securities will have characteristics and risks similar to
those in the target index.  The Fund may also purchase money market  instruments
and certain  derivatives  in order to manage cash flow into and out of the Fund,
reduce  transaction  costs,  or add value when these  instruments  are favorably
priced.

     The Fund may invest, to a limited extent, in foreign securities.

     The Fund may also invest,  to a limited  extent,  in stock and bond futures
and options  contracts,  which are traditional types of derivatives.  Losses (or
gains)  involving  futures  can  sometimes  be  substantial--in  part  because a
relatively small price movement in a futures contract may result in an immediate
and  substantial  loss (or gain) for a fund.  This Fund will not use futures for
speculative  purposes  or as  leveraged  investments  that  magnify the gains or
losses of an  investment.  The Fund's  obligation to purchase  securities  under
futures contracts will not exceed 20% of its total assets.

 The reasons  for which the Fund will  invest in futures  and options  are:
o    To keep cash on hand to meet  shareholder  redemptions or other needs while
     simulating full investment in stocks and bonds.
o    To reduce the Fund's  transaction costs or add value when these instruments
     are favorably priced.

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                   DERIVATIVES
 A  derivative  is a financial  contract  whose value is based on (or  "derived"
 from) a traditional  security (such as a stock or a bond),  an asset (such as a
 commodity  like gold),  or a market index (such as the S&P 500 Index).  Futures
 and options are derivatives  that have been trading on regulated  exchanges for
 more  than  two  decades.  These  "traditional"  derivatives  are  standardized
 contracts  that can  easily be bought  and sold,  and whose  market  values are
 determined and published daily. It is these  characteristics that differentiate
 futures and options from the relatively new types of  derivatives.  If used for
 speculation or as leveraged  investments,  derivatives  can carry  considerable
 risks.
--------------------------------------------------------------------------------


THE FUND AND VANGUARD


The Fund is a member of The Vanguard  Group, a family of more than 35 investment
companies with more than . funds holding assets worth more than $. billion.  All
of the



<PAGE>

13

Vanguard funds share in the expenses associated with business  operations,  such
as personnel, office space, equipment, and advertising.

 Vanguard also provides marketing services to the funds.  Although  shareholders
do not pay sales  commissions  or 12b-1  distribution  fees,  each fund pays its
allocated share of The Vanguard Group's marketing costs.

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                      VANGUARD'S UNIQUE CORPORATE STRUCTURE
 The Vanguard  Group is truly a MUTUAL mutual fund company.  It is owned jointly
 by the funds it  oversees  and thus  indirectly  by the  shareholders  in those
 funds. Most other mutual funds are operated by for-profit  management companies
 that may be owned by one person, by a group of individuals, or by investors who
 own the management company's stock. By contrast, Vanguard provides its services
 on an "at-cost"  basis, and the funds' expense ratios reflect only these costs.
 No separate  management  company reaps profits or absorbs losses from operating
 the funds.
--------------------------------------------------------------------------------


INVESTMENT ADVISER


The Vanguard Group (Vanguard), P.O. Box 2600, Valley Forge, PA 19482, founded in
1975,  serves as the Fund's adviser through its Core Management and Fixed Income
Groups. As of the fiscal year ended June 30, 2000, Vanguard served as adviser
for about $. billion in assets.  Vanguard  manages the Fund on an at-cost basis,
subject to the control of the Trustees and officers of the Fund.  For the fiscal
year ended June 30, 2000, the Fund's investment advisory expenses represented an
effective annual rate of approximately .%.


     The adviser is authorized to choose  brokers-dealers to handle the purchase
and sale of the Fund's securities,  and to seek out the best available price and
most  favorable  execution for all  transactions.  Also, the Fund may direct the
adviser to use a  particular  broker for certain  transactions  in exchange  for
commission rebates or research services provided to the Fund.

     In the interest of obtaining better execution of a transaction, the adviser
may at times  choose  brokers who charge  higher  commissions.  If more than one
broker can obtain the best available  price and most favorable  execution,  then
the adviser is  authorized  to choose a broker who, in addition to executing the
transaction, will provide research services to the adviser or the Fund.


<PAGE>

14

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                               THE FUND'S ADVISER
 The individuals  primarily  responsible  for overseeing the Fund's  investments
 are:

 GEORGE U. SAUTER, Managing Director of Vanguard and head of Vanguard's Core
 Management Group; has worked in investment management since 1985; primary
 responsibility for Vanguard's stock indexing investment policy and strategy
 since joining the company in 1987; has served as the portfolio manager for
 the stock portion of the Fund since inception; A.B., Dartmouth College;
 M.B.A., University of Chicago.

 IAN A. MACKINNON, Managing Director of Vanguard and head of Vanguard's Fixed
 Income Group; has worked in investment management since 1974; primary
 responsibility for Vanguard's internal fixed-income policy and strategy since
 joining the company in 1981; has been responsible for overseeing the
 portfolio management of the bond portion of the Fund since inception; B.A.,
 Lafayette College; M.B.A., Pennsylvania State University.

 FELIX B. LIM, has worked in investment management since completing his
 education in 1996; joined Vanguard in January 1999; worked as a credit
 analyst until January 2000; B.A. and M.S., University of Pennsylvania
 (Wharton School).
--------------------------------------------------------------------------------

DIVIDENDS, CAPITAL GAINS, AND TAXES

FUND DISTRIBUTIONS

The Fund  distributes to shareholders  virtually all of its net income (interest
and dividends,  less  expenses),  as well as any capital gains realized from the
sale of its holdings. Income dividends generally are distributed in March, June,
September,  and  December;   capital  gains  distributions  generally  occur  in
December.   In  addition,   the  Fund  may  occasionally  be  required  to  make
supplemental  dividend or capital gains  distributions at some other time during
the year. You can receive  distributions of income dividends or capital gains in
cash, or you can have them automatically reinvested in more shares of the Fund.

BASIC TAX POINTS

Vanguard will send you a statement  each year showing the tax status of all your
distributions.  In addition,  taxable investors should be aware of the following
basic tax points:
o    Distributions are taxable to you for federal income tax purposes whether or
     not you reinvest these amounts in additional Fund shares.
o    Distributions   declared  in  December--if  paid  to  you  by  the  end  of
     January--are  taxable  for  federal  income tax  purposes as if received in
     December.
o    Any dividends and short-term  capital gains that you receive are taxable to
     you as ordinary income for federal income tax purposes.
o    Any  distributions  of net  long-term  capital  gains are taxable to you as
     long-term capital gains for federal income tax purposes, no matter how long
     you've owned shares in the Fund.
o    Capital gains  distributions  may vary  considerably from year to year as a
     result of the Fund's normal investment activities and cash flows.


<PAGE>

15

o    A sale or exchange of Fund shares is a taxable  event.  This means that you
     may have a capital gain to report as income, or a capital loss to report as
     a deduction, when you complete your federal income tax return.
o    Dividend and capital gains  distributions that you receive, as well as your
     gains or losses from any sale or exchange of Fund shares, may be subject to
     state and local income taxes.


GENERAL INFORMATION

BACKUP  WITHHOLDING.   By  law,  Vanguard  must  withhold  31%  of  any  taxable
distributions  or redemptions from your account if you do not: n provide us with
your  correct  taxpayer  identification  number;  n  certify  that the  taxpayer
identification  number is  correct;  and n confirm  that you are not  subject to
backup withholding.  Similarly,  Vanguard must withhold from your account if the
IRS instructs us to do so.

FOREIGN  INVESTORS.  The Vanguard funds  generally do not offer their shares for
sale outside of the United States.  Foreign  investors should be aware that U.S.
withholding  and estate taxes may apply to any  investments  in Vanguard  funds.

INVALID  ADDRESSES.  If a dividend or capital gains distribution check mailed to
your address of record is returned as undeliverable, Vanguard will automatically
reinvest  all future  distributions  until you  provide us with a valid  mailing
address.

TAX CONSEQUENCES.  This prospectus provides general tax information only. If you
are investing through a tax-deferred retirement account, such as an IRA, special
tax rules apply. Please consult your tax adviser for detailed  information about
a fund's tax consequences for you.

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  DISTRIBUTIONS
 As a  shareholder,  you are  entitled  to your share of the fund's  income from
 interest and  dividends,  and gains from the sale of  investments.  You receive
 such  earnings as either an income  dividend or a capital  gains  distribution.
 Income  dividends  come from both the  dividends  that the fund  earns from its
 holdings  and  the  interest  it  receives  from  its  money  market  and  bond
 investments.  Capital gains are realized whenever the fund sells securities for
 higher prices than it paid for them. These capital gains are either  short-term
 or long-term, depending on whether the fund held the securities for one year or
 less, or more than one year.
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                              "BUYING A DIVIDEND"
 Unless you are investing through a tax-deferred  retirement account (such as an
 IRA),  it is not to your  advantage to buy shares of a fund  shortly  before it
 makes a  distribution,  because  doing so can cost you money in taxes.  This is
 known as "buying a dividend."  For example:  on December 15, you invest $5,000,
 buying 250 shares for $20 each. If the fund pays a distribution of $1 per share
 on December 16, its share price would drop to $19 (not counting market change).
 You still have only $5,000 (250 shares x $19 = $4,750 in share value,  plus 250
 shares x $1 = $250 in distributions),  but you owe tax on the $250 distribution
 you  received--even  if you  reinvest  it in more  shares.  To avoid  "buying a
 dividend," check a fund's distribution schedule before you invest.
--------------------------------------------------------------------------------


<PAGE>

16

SHARE PRICE


The Fund's share price,  called its net asset value,  or NAV, is calculated each
business day after the close of regular  trading on the New York Stock  Exchange
(the NAV is not  calculated  on  holidays  or other  days when the  Exchange  is
closed). The Fund computes a separate net asset value for each of its share
classes. This is done by dividing the net assets attributed to each share class
by the number of Fund shares outstanding for each share class.


                              NET ASSETS
NET ASSET VALUE =   -------------------------------
                     NUMBER OF SHARES OUTSTANDING


 Knowing the daily net asset value is useful to you as a shareholder  because it
indicates the current value of your  investment.  The Fund's NAV,  multiplied by
the  number of  shares  you own,  gives you the  dollar  amount  you would  have
received had you sold all of your shares back to the Fund that day.

 A NOTE ON PRICING:  The Fund's investments will be priced at their market value
when market  quotations  are readily  available.  When these  quotations are not
readily  available,  investments will be priced at their fair value,  calculated
according to procedures adopted by the Fund's Board of Trustees.


 The Fund's  share price can be found daily in the mutual fund  listings of most
major newspapers under the heading "Vanguard Index Funds." Different  newspapers
use different  abbreviations of the Fund's name, but the most common is BALANCED
for the Fund's Investor Shares and . for the Fund's Admiral Shares.



FINANCIAL HIGHLIGHTS


The following financial highlights table pertains to the Fund's Investor Shares;
the Fund's Admiral Shares were not available during the periods shown. The table
is intended to help you understand the Fund's financial performance for the past
five years, and certain information reflects financial results for a single Fund
share.  The total returns in the table represent the rate that an investor would
have  earned  or  lost  each  year  on  an  investment  in  the  Fund  (assuming
reinvestment of all dividend and capital gains distributions).  This information
has been derived from the financial statements audited by PricewaterhouseCoopers
LLP,  independent  accountants,  whose  report--along  with the Fund's financial
statements--is included in the Fund's most recent annual report to shareholders.
You may  have  the  annual  report  sent to you  without  charge  by  contacting
Vanguard.



<PAGE>

17

<TABLE>
<CAPTION>


--------------------------------------------------------------------------------------------------------------------------
                                                                   VANGUARD BALANCED INDEX FUND--INVESTOR SHARES
                                          SIX MONTHS                            YEAR ENDED DECEMBER 31,
                                               ENDED----------------------------------------------------------------------
                                       JUNE 30, 2000        1999            1998          1997          1996          1995
--------------------------------------------------------------------------------------------------------------------------
<S>                                             <C>        <C>              <C>           <C>           <C>            <C>
NET ASSET VALUE, BEGINNING OF YEAR               $.      $18.48           $16.29        $13.92        $12.77        $10.34
--------------------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
 Net Investment Income                             .         .58             .54          .520           .50          .45
 Net Realized and Unrealized Gain                  .        1.88            2.33         2.525          1.26         2.48
  (Loss) on Investments
                                       -----------------------------------------------------------------------------------
  Total from Investment Operations                 .        2.46            2.87         3.045          1.76         2.93
                                       -----------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net Investment Income              .        (.58)           (.54)        (.530)         (.49)        (.45)
 Distributions from Realized Capital               .        (.14)           (.14)        (.145)         (.12)        (.05)
  Gains
                                       -----------------------------------------------------------------------------------
  Total Distributions                              .        (.72)           (.68)        (.675)         (.61)        (.50)
--------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF YEAR                      $.      $20.22          $18.48        $16.29        $13.92       $12.77
==========================================================================================================================
TOTAL RETURN*                                     .%      13.61%          17.85%        22.24%        13.95%       28.64%
==========================================================================================================================

RATIOS/SUPPLEMENTAL DATA
 Net Assets, End of Year (Millions)               $.      $3,128          $2,004        $1,260          $826         $590
 Ratio of Total Expenses to Average
  Net Assets                                      .%       0.20%           0.21%         0.20%         0.20%        0.20%
 Ratio of Net Investment Income to
  Average Net Assets                              .%       3.18%           3.29%         3.56%         3.69%        3.85%
 Turnover Rate                                    .%         29%             25%           18%         37%**          16%
=========================================================================================================================
</TABLE>

 *Total return figures do not reflect the annual account maintenance fee of $10.
**Turnover rate excluding in-kind redemptions was 30%.



--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                  HOW TO READ THE FINANCIAL HIGHLIGHTS TABLE

The Fund began June 30, 2000 with a net asset value (price) of $18.48 per share.
During the period, the Fund earned $. per share from investment income (interest
and dividends) and $. per share from  investments  that had appreciated in value
or that were sold for higher  prices  than the Fund paid for them.

Shareholders  received  $. per share in the form of dividend  and capital  gains
distributions.  A portion of each period's distributions may come from the prior
period's income or capital gains.

The earnings ($. per share) minus the distributions ($. per share) resulted in a
share price of $. at the end of the period.  This was a increase of $. per share
(from $. at the  beginning of the period to $. at the end of the period).  For a
shareholder who reinvested the distributions in the purchase of more shares, the
total return from the Fund was .% for the period.

As of June 30, 2000,  the Fund had $. billion in net assets.  For the period its
expense  ratio was .% ($.  per  $1,000 of net  assets);  and its net  investment
income amounted to .% of its average net assets. It sold and replaced securities
valued at .% of its net assets.
--------------------------------------------------------------------------------


"Standard & Poor's(R),"  "S&P(R),"  "S&P  500(R),"  "Standard & Poor's 500," and
"500" are trademarks of The McGraw-Hill Companies, Inc.


<PAGE>

18


--------------------------------------------------------------------------------
 INVESTING WITH VANGUARD

 This  section of the  prospectus  explains  the basics of doing  business  with
 Vanguard. A special booklet,  The Vanguard Service Directory,  provides details
 of our many shareholder services for individual investors.  A separate booklet,
 The Compass, does the same for institutional  investors. You can request either
 booklet  by  calling  or  writing  Vanguard,   using  the  Contacting  Vanguard
 instructions found at the end of this section.

                                  BUYING SHARES
                                CONVERTING SHARES
                                REDEEMING SHARES
                           OTHER RULES YOU SHOULD KNOW
                            FUND AND ACCOUNT UPDATES
                               CONTACTING VANGUARD
--------------------------------------------------------------------------------

BUYING SHARES

ACCOUNT MINIMUMS FOR       TO OPEN AND MAINTAIN AN ACCOUNT:$3,000 for regular
INVESTOR SHARES            accounts; $1,000 for IRAs and custodial accounts for
                           minors.
                           TO ADD TO AN EXISTING ACCOUNT:$100 by mail or
                           exchange;  $1,000 by wire.

ACCOUNT MINIMUMS FOR       TO OPEN AND MAINTAIN AN ACCOUNT:$250,000 for new
ADMIRAL SHARES             investors; $150,000 or $50,000 for existing investors
                           who are eligible to convert  Investor Shares into
                           Admiral Shares (see Converting Shares).
                           Admiral Shares are not available to participants in
                           employee benefit plans administered by Vanguard or
                           403(b)(7) custodial accounts.
                           TO ADD TO AN EXISTING ACCOUNT:$. by mail or exchange;
                           $. by wire.

HOW TO BUY SHARES          BY CHECK: Mail your check and a completed account
                           registration to Vanguard. When adding to an existing
                           account, send your check with an Invest-By-Mail form
                           detached from your last account statement. For
                           addresses, see Contacting Vanguard.
                           BY EXCHANGE PURCHASE: You can purchase shares with
                           the proceeds of a redemption  from another  Vanguard
                           fund.  All open Vanguard funds permit exchange
                           purchases  requested in writing. MOST VANGUARD FUNDS
                           - OTHER THAN THE INDEX-ORI ENTED FUNDS - ALSO  ACCEPT
                           EXCHANGE  PURCHASES  REQUESTED  ONLINE  OR  BY
                           TELEPHONE. See Other Rules You Should Knowfor
                           specifics.
                           BY WIRE: Call Vanguard to purchase shares by wire.
                           For wire instructions, see Contacting Vanguard.

YOUR PURCHASE CHECK        When investing by check, make the check payable to:
                           The Vanguard Group--02.


<PAGE>

                                                                              19

YOUR PURCHASE  PRICE       You buy shares at a fund's  next-determined net asset
                           value (NAV) after Vanguard  accepts your purchase
                           request.  As long as your  request is  accepted
                           before the close of trading on the New York Stock
                           Exchange  (generally 4 p.m.  Eastern  time),  you
                           will buy your  shares  at that day's NAV. This is
                           known as your TRADE DATE.

PURCHASE RULES YOU         THIRD PARTY CHECKS. To protect the funds from check
SHOULD KNOW                fraud, Vanguard will not accept checks made payable
                           to third parties.
                           U.S. CHECKS ONLY.  All purchase checks must be
                           written in U.S. dollars and drawn on a U.S. bank.
                           LARGE PURCHASES. Vanguard reserves the right to
                           reject any purchase request that may disrupt a fund's
                           operation or performance. Please call us before
                           attempting to invest a large dollar amount.
                           NO CANCELLATIONS. Place your transaction requests
                           carefully. Vanguard will NOT cancel any  transaction
                           once it has been  initiated and a confirmation number
                           has been assigned (if applicable).
                           FUTURE PURCHASES. All Vanguard funds reserve the
                           right to stop selling shares at any time.

CONVERTING SHARES

IMMEDIATE CONVERSIONS      All shares purchased before the Fund began issuing
INTO ADMIRAL SHARES        Admiral Shares are considered Investor Shares. You
                           may convert Investor  Shares into Admiral Shares at
                           any time if your account  balance  in  the  Fund  is
                           at  least  $250,000. Registered   users  of
                           vanguard.com   may   request  a conversion  to
                           Admiral  Shares  on-line.  Or,  you  may contact
                           Vanguard by  telephone  or mail to request this
                           transaction.

LOYALTY CONVERSIONS        THREE YEAR PRIVILEGE. After three years in the Fund,
INTO ADMIRAL SHARES        you may convert  Investor  Shares  into  Admiral
                           Shares if your account  balance  is  at  least
                           $150,000  and  you  are  registered with
                           vanguard.com.
                           TEN YEAR PRIVILEGE. After ten years in the Fund,  you
                           may convert Investor Shares into  Admiral  Shares if
                           your account balance is at least $50,000,  you are
                           registered with vanguard.com, and  you  meet
                           Vanguard's   requirements  for  low-cost accounts.
                           Registered users of vanguard.com may request a
                           loyalty conversion on-line. Or, you may contact
                           Vanguard by telephone mail to request this
                           transaction.

MANDATORY CONVERSIONS      If an  investor  no longer  meets the  requirements
INTO ADMIRAL SHARES        for Admiral  Shares,  the Fund may  convert  the
                           investor's Admiral  Shares into Investor  Shares.  A
                           decline in theinvestor's  account balance due to
                           market  movement may result in such a conversion. Th
                           Fund will notify the investor in writing before any
                           mandatory conversion.


<PAGE>

20

REDEEMING SHARES

HOW TO REDEEM SHARES       Be sure to check Other Rules You Should Know before
                           initiating your request.
                           ONLINE: Request a redemption through our website at
                           Vanguard.com.
                           BY TELEPHONE: Contact Vanguard by telephone to
                           request a redemption. For telephone numbers, see
                           Contacting Vanguard.
                           BY MAIL: Send your written redemption instructions to
                           Vanguard. For addresses, see Contacting Vanguard.

YOUR REDEMPTION PRICE      You   redeem   shares  at  a  Fund's  next-determined
                           net asset  value  (NAV)  after  Vanguard accepts your
                           redemption  request,  including any special
                           documentation required under the cir cumstances . As
                           long as your  request is accepted  before the close
                           of trading on the New York Stock Exchange  (generally
                           4 p.m. Eastern time), your shares are redeemed at
                           that day's NAV.  This is known as your TRADE DATE.
TYPES OF REDEMPTION        CHECK REDEMPTIONS: Unless instructed otherwise,
                           Vanguard will mail you a check, normally within two
                           business days of your redemption.
                           EXCHANGE REDEMPTIONS: You may instruct Vanguard to
                           apply the proceeds of your redemption to purchase
                           shares of another Vanguard fund. All open Vanguard
                           funds accept exchange redemptions requested in
                           writing. Most Vanguard funds--other than the index-
                           oriented funds--also accept exchange redemptions
                           requested online or by telephone. See Other Rules You
                           Should Know for specifics.


<PAGE>

                                                                              21

                           WIRE REDEMPTIONS: When redeeming from a money market
                           fund,  bond  fund, or the  Preferred  Stock  Fund,
                           you may instruct Vanguard  to wire your  redemption
                           proceeds  to a previously designated bank account.
                           Wire redemptions are not available for Vanguard's
                           other funds, except by exchanging into a bond or
                           money market fund first.  The wire redemption option
                           is  not automatic  ;  you  must   establish  it  by
                           completing a special form or the appropriate section
                           of your account   registration.   Also  wire
                           redemptions  must  be requested in writing or by
                           telephone, not online. A $5 fee applies to wire
                           redemptions under $5,000.
                           Money Market Funds: For telephone requests accepted
                           at Vanguard by 10:30 a.m.,  Eastern time,  the
                           redemption  proceeds will arrive at your bank by the
                           close of business that same day. For other  requests
                           accepted  before 4 p.m.,  the redemption proceeds
                           will arrive at your bank by the close of business on
                           the following business day.
                           Bond Funds: For requests  accepted at Vanguard by 4
                           p.m.  Eastern time,the  redemption  proceeds  will
                           arrive  at your bank by the close of business on the
                           following business day.

REDEMPTION RULES YOU       SPECIAL ACCOUNTS. Special documentation may be
SHOULD KNOW                required to redeem from certain types of accounts,
                           such as trust, corporate, non-profit, or retirement
                           accounts. Please call us before attempting to redeem
                           from these types of accounts.
                           POTENTIALLY DISRUPTIVE REDEMPTIONS. Vanguard reserves
                           the  right  to  pay  all  or  part  of  your
                           redemption in-kind--that  is,  in  the  form  of
                           securities--if  we believe that a cash  redemption
                           would disrupt the fund's operation  or  performance.
                           Under  these  circumstances, Vanguard also reserves
                           the right to delay payment of your redemption
                           proceeds for up to seven days.  By calling us before
                           you attempt to redeem a large dollar amount, you are
                           more likely to avoid in-kind or delayed payment of
                           your redemption.
                           RECENTLY PURCHASED SHARES. While you can redeem
                           shares at any time,  proceeds will not be made
                           available to you until the Fund collects payment for
                           your purchase. This  may  take  up  to  ten  calendar
                           days  for  shares purchased by check or Vanguard Fund
                           Express.
                           PAYMENT TO A DIFFERENT PERSON OR ADDRESS. We can make
                           your  redemption  check payable to a different
                           person or send it to a different  address.  However,
                           this requires the written  consent of all  registered
                           account  owners, which must be provided under
                           signature  guarantees.  You can obtain a signature
                           guarantee from most commercial and savings banks,
                           credit unions, trust companies,  or member irms of a
                           U.S. stock exchange.


<PAGE>

22

                           NO CANCELLATIONS. Place your transaction requests
                           carefully. Vanguard will NOT cancel any  transaction
                           once it has been  initiated  and a confirmation
                           number has been assigned (if applicable).
                           EMERGENCY CIRCUMSTANCES. Vanguard funds can postpone
                           payment of redemption proceeds for up to seven
                           calendar days at any time. In addition, Vanguard
                           funds can suspend redemptions and/or postpone payment
                           of redemption proceeds at times when the New York
                           Stock Exchange is closed or during emergency
                           circumstances, as determined by the U.S. Securities
                           and Exchange Commission.

OTHER RULES YOU SHOULD KNOW

TELEPHONE TRANSACTIONS     AUTOMATIC. In setting up your account,  we'll
                           automatically  enable you to do business with us by
                           regular telephone,  unless you instruct us otherwise
                           in writing.
                           TELE-ACCOUNT. To  conduct  account  transactions
                           through  Vanguard's automated  telephone  service,
                           you must first  obtain a  personal identification
                           number (PIN). Call Tele- Account to obtain a PIN,
                           and  allow 7 days  before  using  this service.
                           PROOF OF A CALLER'S AUTHORITY. We reserve the right
                           to refuse a telephone request if the caller is unable
                           to provide the following information exactly as
                           registered on the account
                           - Ten-digit account number.
                           - Complete owner name and address.
                           - Primary Social Security or employer identification
                             number.
                           - Personal Identification Number (PIN), if
                             applicable.
                           SUBJECT TO REVISION. We reserve the right to revise
                           or terminate Vanguard's telephone transaction service
                           at any time, without notice.
                           SOME VANGUARD FUNDS DO NOT PERMIT TELEPHONE
                           EXCHANGES. To  discourage  market-timing,  Vanguard's
                           stock index funds,  Growth and Income Fund,  and
                           Balanced Index Fund generally do not permit telephone
                           exchanges (in or out),except for IRAs and certain
                           other retirement accounts.

VANGUARD.COM               REGISTRATION. You can use your personal computer to
                           review your account holdings, to sell or exchange
                           shares of most Vanguard funds, and to perform other
                           transactions. To establish this service, you can
                           register online.
                           SOME VANGUARD FUNDS DO NOT PERMIT ONLINE EXCHANGES.
                           To discourage market-timing,  Vanguard's stock index
                           funds,Growth  and  Income  Fund,  and  Balanced
                           Index Fund do not permit online exchanges (in or out)
                           , except for IRAs and certain other retirement
                           accounts.


<PAGE>

                                                                              23

WRITTEN INSTRUCTIONS       "GOOD ORDER" REQUIRED. We reserve the right to reject
                           any written transaction instructions that are not in
                           "good order." This means that your instructions must
                           include:
                           - The fund name and account number.
                           - The amount of the transaction (in dollars or
                             shares).
                           - Signatures of all owners exactly as registered on
                             the account.
                           - Signature   guarantees,   if  required  for  the
                             type  of transaction.*
                             *For instance,  signature guarantees must be
                           provided  by  all  registered  account  shareholders
                           when redemption  proceeds are to be sent to a
                           different  person or address.


RESPONSIBILITY FOR         Vanguard will not be responsible for any account
FRAUD                      losses due to fraud, so long as we reasonably believe
                           that the person transacting on an account is
                           authorized to do so. Please take precautions to
                           protect  yourself from fraud.  Keep your account
                           information  private and immediately review any
                           account  state  ments  that  we  send  to  you.
                           Contact Vanguard  immediately about any transactions
                           you believe to be unauthorized.


UNCASHED CHECKS            Please cash your  distribution  or redemption checks
                           promptly. Vanguard will not pay interest on uncashed
                           checks.

LIMITS ON ACCOUNT          Because  excessive  account  transactions  can
ACTIVITY                   disrupt management of a fund and increase the fund's
                           costs for all shareholders,  Vanguard limits account
                           activity as follows:
                           - You may make no more than two substantive  "round
                             trips"  through a non-money market fund during any
                             12-month n period.
                           - Your round trips  through a non-money  market fund
                             must be at least 30 days apart.
                           - All funds may refuse share  purchases at any time,
                             for any reason.
                           - Vanguard  reserves  the  right to revise  or
                             terminate  the exchange  privilege,  limit the
                             amount of an exchange,  or reject an exchange,  at
                             any time,  for any reason.
                           - A "round trip" is a redemption from a fund
                             followed by a purchase back into the same fund.
                             Also, a "round  trip"  covers  transactions
                             accomplished  by  any  combination  of  methods,
                             including transactions  conducted by check,  wire,
                             or exchange to/from another Vanguard fund.
                             "Substantive"  means a dollar amount that  Vanguard
                             determines,  in its sole  discretion,  could
                             adversely affect the management of the fund.

UNUSUAL CIRCUMSTANCES      If you experience difficulty contacting Vanguard
                           online, by telephone, or by Tele-Account, you can
                           send us your transaction request by regular or
                           express mail. See Contacting Vanguard for addresses.


<PAGE>

24

INVESTING WITH             You may purchase or sell Investor Shares of most
VANGUARD THROUGH OTHER     Vanguard   funds through a financial intermediary,
FIRMS                      such as a bank broker, or investment adviser. Admiral
                           Shares of the Vanguard funds generally   are   not
                           available    through   financial intermediaries.
                           If you invest with Vanguard  through an intermediary,
                           please read that firm's program materials carefully
                           to learn of any spe cial rules that may apply.For
                           example,  special  terms  may  apply to  additional
                           service features, fees, or other policies.  Consult
                           your intermediary  to  determine  when  your  order
                           will  be priced.

LOW BALANCE  ACCOUNTS      All Vanguard  funds reserve the right to close any
                           nonretirement account whose balance falls below the
                           minimum initial investment. Vanguard deducts a $10
                           fee in June from each  nonretirement  account whose
                           balance at that time is below $2,500  ($500 for
                           Vanguard  STAR Fund, and $10,000 for Van guard Tax-
                           Managed  Funds).  The fee is waived if your total
                           Vanguard account assets are $50,000 or more.


FUND AND ACCOUNT UPDATES

PORTFOLIO SUMMARIES        We will send you quarterly portfolio summaries to
                           help you keep track of your accounts  throughout  the
                           year. Each sum mary shows the market value of your
                           account at the close   of  the   statement   period,
                           as   well   as  all distributions,  purchases,  sale,
                           and  exchanges  for the current calendar year.

AVERAGE COST REVIEW        For most taxable accounts, average cost review
STATEMENTS                 statements will accompany the quarterly portfolio
                           summaries. These statements  show  the  average  cost
                           of  shares  that  you redeemed  during  the  current
                           calendar  year,  using the average cost single
                           category method.


CONFIRMATION               Each time you buy, sell or exchange shares, we will
STATEMENTS                 send you a statement confirming the trade date and
                           amount of your transaction.

TAX STATEMENTS             We will send you annual tax  statements to assist in
                           preparing  your income tax  returns.  These
                           statements, which are generally  mailed in  January,
                           will  report the previous  year's  dividend and
                           capital gains  distributions, proceeds  from the sale
                           of shares,  and  distributions  from IRAs or other
                           retirement plans.


<PAGE>

                                                                              25

REPORTS                    You will receive financial reports about your funds
                           twice a year in February and August. These
                           comprehensive reports include an assessment of the
                           fund's performance (and a comparison to its industry
                           benchmark), an overview of the markets, a report from
                           the advisers, and the fund's financial statements
                           which include a listing of the fund's holdings. To
                           keep the funds' costs as low as possible (so that you
                           and other shareholders can keep more of the funds'
                           investment earnings), Vanguard attempts to eliminate
                           duplicate mailings to the same address. When we find
                           that two or more shareholders have the same last name
                           and address, we send just one fund report to that
                           address-instead of mailing separate reports to each
                           shareholder. If you want us to send separate reports,
                           however, you may notify our Client Services
                           Department.


CONTACTING VANGUARD

ONLINE                     VANGUARD.COM
                           - Your best source of Vanguard news
                           - For fund,  account,  and service  information
                           - For most account  transactions
                           - For literature requests n 24 hours per day, 7 days
                             per week

VANGUARD TELE-ACCOUNT      - For automated fund and account information
1-800-662-6273             - For redemptions by check,  exchange, or wire
(ON-BOARD)                 - Toll-free 24 hours per day, 7 days per week


INVESTOR INFORMATION       - For fund and service information
1-800-662-7447 (SHIP)      - For literature requests
(Text telephone at         - Business hours only
1-800-952-3335)


CLIENT SERVICES            - For account information
1-800-662-2739 (CREW)      - For most account transactions
(Text telephone at         - Business hours only
1-800-749-7273)


INSTITUTIONAL DIVISION     - For information and services for large
1-888-809-8102               institutional investors
                           - Business hours only


<PAGE>

26

VANGUARD ADDRESSES         REGULAR MAIL (INDIVIDUALS-CURRENT CLIENTS):
                           The Vanguard Group
                           P.O. Box 1110
                           Valley Forge, PA 19482-1110


                           REGULAR MAIL (INSTITUTIONS):
                           The Vanguard Group
                           P.O. Box 2900
                           Valley Forge, PA 19482-2900


                           REGULAR MAIL (GENERAL INQUIRIES):
                           The Vanguard Group
                           P.O. Box 2600
                           Valley Forge, PA 19482-2600


                           REGISTERED OR EXPRESS MAIL:
                           The Vanguard Group
                           455 Devon Park Drive
                           Wayne, PA 19087-1815


FUND NUMBER                Always use this fund number when contacting Vanguard
                           about the Fund: Vanguard Balanced Index Fund - 02


<PAGE>

                     (THIS PAGE INTENTIONALLY LEFT BLANK.)
<PAGE>

                     (THIS PAGE INTENTIONALLY LEFT BLANK.)

<PAGE>

GLOSSARY OF INVESTMENT TERMS

ACTIVE MANAGEMENT
An investment approach that seeks to exceed the average returns of the financial
markets.  Active  managers  rely on research,  market  forecasts,  and their own
judgment and experience in selecting securities to buy and sell.

BALANCED FUND
A mutual fund that seeks to provide some combination of income,  capital growth,
and conservation of capital by investing in stocks,  bonds,  and/or money market
instruments.

BOND
A debt security (IOU) issued by a corporation,  government, or government agency
in exchange for the money you lend it. In most  instances,  the issuer agrees to
pay back the loan by a specific date and to make regular interest payments until
that date.

CAPITAL GAINS DISTRIBUTION
Payment to mutual fund  shareholders of gains realized on securities that a fund
has sold at a profit, minus any realized losses.

CREDIT QUALITY
A measure of a bond  issuer's  ability to pay interest and principal in a timely
manner.

DIVIDEND INCOME
Payment to  shareholders  of income from  interest or  dividends  generated by a
fund's investments.

DURATION
A measure of the  sensitivity  of bond--and bond  fund--prices  to interest rate
movements.  For example,  if a bond has a duration of two years, its price would
fall by about 2% when interest  rates rose one  percentage  point.  On the other
hand,  the bond's price would rise by about 2% when  interest  rates fell by one
percentage point.

EXPENSE RATIO
The  percentage  of a fund's  average net assets used to pay its  expenses.  The
expense ratio  includes  management  fees,  administrative  fees,  and any 12b-1
distribution fees.

FACE VALUE
The  amount to be paid at  maturity  of a bond;  also  known as the par value or
principal.

INDEX
An unmanaged group of securities whose overall performance is used as a standard
to measure investment performance.

INVESTMENT GRADE
A bond whose credit quality is considered by independent bond-rating agencies to
be sufficient to ensure timely  payment of principal and interest  under current
economic  circumstances.  Bonds rated in one of the four highest  categories are
considered "investment grade."

MATURITY
The date when a bond issuer agrees to repay the bond's principal, or face value,
to the bond's buyer.

NET ASSET VALUE (NAV)
The market value of a mutual fund's total assets, minus liabilities,  divided by
the  number of shares  outstanding.  The value of a single  share is called  its
share value or share price.

PASSIVE MANAGEMENT
A low-cost  investment strategy in which a mutual fund attempts to match--rather
than  outperform--  a  particular  stock or bond  market  index.  Also  known as
indexing.

PRICE/EARNINGS (P/E) RATIO
The current share price of a stock,  divided by its per-share earnings (profits)
from the past year. A stock selling for $20, with earnings of $2 per share,  has
a price/earnings ratio of 10.

TOTAL RETURN
A percentage change,  over a specified time period, in a mutual fund's net asset
value,  with the ending net asset value adjusted to account for the reinvestment
of all distributions of dividends and capital gains.

VOLATILITY
The  fluctuations  in value of a mutual  fund or other  security.  The greater a
fund's volatility, the wider the fluctuations between its high and low prices.

YIELD
Income  (interest  or  dividends)  earned  by  an  investment,  expressed  as  a
percentage of the investment's price.

<PAGE>

                                                  [SHIP]
                                                  [THE VANGUARD GROUP(R)]
                                                  Post Office Box 2600
                                                  Valley Forge, PA 19482-2600



FOR MORE INFORMATION
If you'd like more information about
Vanguard Balanced Index Funds, the
following documents are available
free upon request:

ANNUAL/SEMIANNUAL REPORTS
TO SHAREHOLDERS
Additional information about the
Funds' investments is available in
the Funds' annual and semiannual
reports to shareholders.

STATEMENT OF ADDITIONAL
INFORMATION (SAI)
The SAI provides more detailed
information about the Funds.

The current annual and semiannual
reports and the SAI are
incorporated by reference into
(and are thus legally a part of)
this prospectus.

To receive a free copy of the latest
annual or semiannual report or the
SAI, or to request additional
information about the Funds or other
Vanguard funds, please contact us
as follows:


THE VANGUARD GROUP
INVESTOR INFORMATION
DEPARTMENT
P.O. BOX 2600
VALLEY FORGE, PA 19482-2600

TELEPHONE:
1-800-662-7447 (SHIP)

TEXT TELEPHONE:
1-800-952-3335

WORLD WIDE WEB:
WWW.VANGUARD.COM

If you are a current Fund  shareholder
and would like information about
your account, account transactions,
and/or account statements,
please call:

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

TEXT TELEPHONE:
1-800-749-7273

INFORMATION PROVIDED BY THE
SECURITIES AND EXCHANGE
COMMISSION (SEC)

You can review and copy information
about the Funds (including the SAI)
at the SEC's Public Reference Room
in Washington, DC. To find out more
about this public service, call the SEC
at 1-202-942-8090. Reports and
other information about the Funds
are also available on the SEC's
website (www.sec.gov), or you can
receive copies of this information,
for a fee, by electronic request at the
following e-mail address:
[email protected], or by writing the
Public Reference Section, Securities
and Exchange Commission,
Washington, DC 20549-0102.


Funds' Investment Company Act
file number: 811-7023


(C) 2000 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation,
Distributor.



P002N-09/2000





<PAGE>

                                                    VANGUARD (R)
                                                    BALANCED INDEX
                                                    FUND

                                                    Participant Prospectus

                                                    September ., 2000






This prospectus  contains
financial data for the
Fund for the six-
months ended
June 30, 2000.


                                                    [A Member of
                                                    The Vanguard Group(R)]


<PAGE>

VANGUARD BALANCED INDEX FUND
Participant Prospectus


 September ., 2000


A Balanced Mutual Fund
--------------------------------------------------------------------------------
CONTENTS

   1 FUND PROFILE                       14 DIVIDENDS, CAPITAL GAINS, AND TAXES

   3 ADDITIONAL INFORMATION             15 SHARE PRICE

   4 AN INTRODUCTION TO INDEX FUNDS     16 FINANCIAL HIGHLIGHTS

   4 A WORD ABOUT RISK                  18 INVESTING WITH VANGUARD

   5 WHO SHOULD INVEST                  19 ACCESSING FUND INFORMATION BY
                                          COMPUTER
   5 PRIMARY INVESTMENT STRATEGIES
                                        GLOSSARY (inside back cover)
  13 THE FUND AND VANGUARD

  13 INVESTMENT ADVISER
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
 WHY READING THIS PROSPECTUS IS IMPORTANT
 This  prospectus  explains the  objective,  risks,  and  strategies of Vanguard
 Balanced Index Fund. To highlight  terms and concepts  important to mutual fund
 investors,  we have  provided  "Plain  Talk(R)"  explanations  along the way.
 Reading the  prospectus  will help you to decide  whether the Fund is the right
 investment for you. We suggest that you keep it for future reference.
--------------------------------------------------------------------------------


--------------------------------------------------------------------------------
 IMPORTANT NOTE

The Fund  offers two  separate  classes of shares:  Investor  Shares and Admiral
Shares.  This  prospectus  offers the Fund's Investor Shares and is intended for
participants  in   employer-sponsored   retirement  or  savings  plans.  Another
version--for investors who would like to open a personal investment account--can
be obtained by calling Vanguard at 1-800-662-7447.
     The Fund's  separate  share classes have different  expenses;  as a result,
their investment  performances will vary. UNLESS OTHERWISE NOTED, ALL REFERENCES
IN  THIS  PROSPECTUS  TO  FEES,  EXPENSES,  AND  INVESTMENT  PERFORMANCE  RELATE
SPECIFICALLY TO INVESTOR SHARES.

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



NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR  DISAPPROVED  OF THESE  SECURITIES OR PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

<PAGE>

                                                                               1

FUND PROFILE


INVESTMENT OBJECTIVE
The Fund seeks to provide  current  income  and  long-term  growth of income and
capital.


INVESTMENT STRATEGIES
The Fund typically  invests 60% of its assets in common stocks and 40% in bonds.
The stock  portion of the Fund seeks to match the total  return of the  Wilshire
5000 Total Market Index, a widely recognized  measure for the U.S. stock market.
The Fund's bond portion  seeks to replicate  the returns of the Lehman  Brothers
Aggregate  Bond Index,  a measure of  regularly  traded,  U.S.  investment-grade
bonds.


PRIMARY RISKS
THE FUND'S TOTAL RETURN,  LIKE STOCK AND BOND PRICES  GENERALLY,  WILL FLUCTUATE
WITHIN A WIDE  RANGE,  SO AN  INVESTOR  COULD LOSE MONEY OVER SHORT OR EVEN LONG
PERIODS. The Fund is also subject to:
o    Stock  market  risk,  which is the chance that stock prices in general will
     decline  over  short or even long  periods.  The stock  market  tends to be
     cyclical,  with periods when stock prices  generally  rise and periods when
     stock prices generally decline.
o    Interest  rate risk,  which is the chance  that bond  prices  overall  will
     decline  over  short or even long  periods  due to rising  interest  rates.
     Interest rate risk should be moderate for the Fund.
o    Income risk, which is the chance that falling interest rates will cause the
     Fund's income to decline. Income risk should be moderate for the Fund.
o    Credit  risk,  which is the  chance  that a bond  issuer  will  fail to pay
     interest and  principal  in a timely  manner,  reducing the Fund's  return.
     Credit risk should be low for the Fund.
o    Prepayment  risk,  which is the  chance  that  during  periods  of  falling
     interest rates, a mortgage-backed  bond issuer will repay a higher-yielding
     bond before its maturity date because the  underlying  mortgages  have been
     paid off ahead of  schedule.  If a bond is called,  the Fund would lose the
     opportunity  for  additional  price  appreciation,  and  would be forced to
     reinvest the  unanticipated  proceeds at lower interest rates. As a result,
     the Fund would experience a decline in income.
o    Index sampling risk,  which is the chance that the securities  selected for
     the Fund  will not  provide  investment  performance  matching  that of the
     index. Index sampling risk for the Fund should be low.

PERFORMANCE/RISK INFORMATION
The bar chart and table below  provide an indication of the risk of investing in
the Fund. The bar chart shows the Fund's performance in each calendar year since
inception.  The table shows how the Fund's  average annual total returns for one
and five calendar  years and since  inception  compare to those of a broad-based
securities  market index. Keep in mind that the Fund's past performance does not
necessarily indicate how it will perform in the future.


<PAGE>

2

--------------------------------------------------------------------------------
                               ANNUAL TOTAL RETURNS
--------------------------------------------------------------------------------
                                 1993      10.00%
                                 1994      -1.56%
                                 1995      28.64%
                                 1996      13.95%
                                 1997      22.24%
                                 1998      17.85%
                                 1999      13.61%
--------------------------------------------------------------------------------

 During the period  shown in the bar chart,  the  highest  return for a calendar
quarter was 12.67% (quarter ended December 31, 1998) and the lowest return for a
quarter was -5.57% (quarter ended September 30, 1998).

--------------------------------------------------------------------------------
          AVERAGE ANNUAL TOTAL RETURNS FOR YEARS ENDED DECEMBER 31, 1999
--------------------------------------------------------------------------------
                                                                     SINCE
                                          1 YEAR     5 YEARS      INCEPTION*
--------------------------------------------------------------------------------

      Vanguard Balanced Index Fund         13.61%     19.13%         14.89%
      Balanced Composite Index**           13.54      19.30          15.19
      Wilshire 5000 Index                  23.77      27.11          20.92
      Lehman Brothers Aggregate Bond       -0.82       7.73           6.57
      Index
--------------------------------------------------------------------------------
       *November 9, 1992.
      **Made up of two  unmanaged  benchmarks,  weighted 60% Wilshire 5000 Index
       and 40% Lehman Brothers Aggregate Bond Index.
--------------------------------------------------------------------------------


FEES AND EXPENSES
The following  table  describes the fees and expenses you may pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1999.

      SHAREHOLDER FEES (fees paid directly from your investment)
      Sales Charge (Load) Imposed on Purchases:                 None
      Sales Charge (Load) Imposed on Reinvested Dividends:      None
      Redemption Fee:                                           None
      Exchange Fee:                                             None


      ANNUAL FUND OPERATING EXPENSES (expenses deducted from the Fund's
      assets)
      Management Expenses:                                      0.17%
      12b-1 Distribution Fee:                                   None
      Other Expenses:                                           0.03%
       TOTAL ANNUAL FUND OPERATING EXPENSES:                    0.20%

 The Fund  reserves  the  right to  deduct a  transaction  fee of 0.08%  from an
investor's cumulative purchases over $100 million.  Where it applies, the fee is
retained  by the  Fund to  offset  transaction  costs  of  investing  large  new
contributions  into the  market.  The fee is not paid to  Vanguard  and is not a
sales charge.


<PAGE>

                                                                               3

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  FUND EXPENSES
 All mutual funds have operating  expenses.  These expenses,  which are deducted
 from a fund's gross income,  are expressed as a percentage of the net assets of
 the fund.  Vanguard Balanced Index Fund's expense ratio in fiscal year 1999 was
 0.20%, or $2 per $1,000 of average net assets. The average balanced mutual fund
 had  expenses  in 1999 of 1.33%,  or $13.30 per  $1,000 of  average  net assets
 (derived  from data  provided by Lipper Inc.,  which reports on the mutual fund
 industry).  Management  expenses,  which  are one part of  operating  expenses,
 include  investment  advisory  fees  as well  as  other  costs  of  managing  a
 fund--such as account  maintenance,  reporting,  accounting,  legal,  and other
 administrative expenses.
--------------------------------------------------------------------------------

 The following  example is intended to help you compare the cost of investing in
the Fund with the cost of investing in other mutual funds.  It  illustrates  the
hypothetical  expenses  that you would incur over various  periods if you invest
$10,000 in the Fund.  This example assumes that the Fund provides a return of 5%
a year, and that operating  expenses  remain the same. The results apply whether
or not you redeem your investment at the end of each period.

--------------------------------------------------------------------------------
          1 YEAR           3 YEARS         5 YEARS           10 YEARS
--------------------------------------------------------------------------------
           $20               $64             $113             $255
--------------------------------------------------------------------------------


 THIS  EXAMPLE  SHOULD  NOT  BE  CONSIDERED  TO  REPRESENT  ACTUAL  EXPENSES  OR
PERFORMANCE  FROM THE PAST OR FOR THE  FUTURE.  ACTUAL  FUTURE  EXPENSES  MAY BE
HIGHER OR LOWER THAN THOSE SHOWN.

--------------------------------------------------------------------------------
ADDITIONAL INFORMATION

DIVIDENDS AND CAPITAL GAINS                       NEWSPAPER  ABBREVIATION
Dividends are  distributed quarterly in March,    Balanced
June, September,  and December;  capital gains,
if any, are distributed annually in December      VANGUARD FUND NUMBER
                                                  02
INVESTMENT ADVISER
The Vanguard Group, Valley Forge, Pa.,            CUSIP NUMBER
since inception                                   921931101

INCEPTION DATE                                    TICKER SYMBOL
November 9, 1992                                  VBINX


NET ASSETS AS OF JUNE 30, 2000
$. billion

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



--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                             THE COSTS OF INVESTING
Costs are an important  consideration in choosing a mutual fund.  That's because
you, as a shareholder,  pay the costs of operating a fund,  plus any transaction
costs  associated with the fund's buying and selling of securities.  These costs
can erode a substantial  portion of the gross income or capital  appreciation  a
fund may achieve.  Even seemingly small  differences in expenses can, over time,
have a dramatic effect on a fund's performance.
--------------------------------------------------------------------------------



<PAGE>

4

AN INTRODUCTION TO INDEX FUNDS

WHAT IS INDEXING?

An index is an unmanaged group of securities  whose overall  performance is used
as a standard to measure the investment  performance of a particular  market. An
index (or "passively managed") fund tries to match, as closely as possible,  the
performance of an established  target index.  The fund does this by holding all,
or a representative sample, of the securities that comprise the index.

 The target index may be a group of stocks or bonds,  or a combination of stocks
and bonds. Balanced index funds hold a mix of stocks and bonds.

 Index funds do not have active  managers who buy and sell  securities  based on
research and analysis.  Rather, index funds are passively managed by the adviser
who seeks to match a market benchmark.

WHY INVEST IN INDEX FUNDS?

Index funds appeal to many investors for a number of reasons:
o    Variety of  investments.  Vanguard index funds  generally  invest in a wide
     variety of companies and industries.

o    Relative  performance  consistency.  Because  they  seek  to  track  market
     benchmarks,  index  funds by  definition  should not  perform  dramatically
     better or worse than their benchmarks.
o    Low cost.  Index funds are  inexpensive  to run as compared  with  actively
     managed funds.  They have lower  research costs and keep trading  activity,
     and thus trading costs, to a minimum.


 KEEP IN MIND THAT AN INDEX FUND HAS OPERATING EXPENSES AND TRANSACTION COSTS; A
MARKET INDEX DOES NOT.  THEREFORE,  AN INDEX  FUND--WHILE  EXPECTED TO TRACK ITS
TARGET  INDEX AS  CLOSELY  AS  POSSIBLE--WILL  TYPICALLY  BE UNABLE TO MATCH THE
PERFORMANCE OF THE INDEX EXACTLY.


--------------------------------------------------------------------------------
A WORD ABOUT RISK

This  prospectus  describes risks you would face as an investor in Vanguard
Balanced  Index Fund.  It is important to keep in mind one of the main axioms of
investing: The higher the risk of losing money, the higher the potential reward.
The  reverse,  also,  is  generally  true:  The lower  the  risk,  the lower the
potential  reward.  As you consider an investment  in the Fund,  you should also
take into account your  personal  tolerance  for the daily  fluctuations  of the
stock and bond markets.

     Look for this [FLAG] symbol  throughout the prospectus.  It is used to mark
detailed  information  about  each  type of risk that you  would  confront  as a
shareholder of the Fund.
--------------------------------------------------------------------------------


WHO SHOULD INVEST

The Fund may be a suitable investment for you if:


o    You are seeking  moderate current income and long-term growth of income and
     capital.

o    You are seeking a diversified combination of U.S. stocks and bonds.


<PAGE>

                                                                               5
o    You are willing to invest for the long term--at least five years.


--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                             COSTS AND MARKET-TIMING
 Some  investors  try  to  profit  from   market-timing--switching   money  into
 investments  when they expect  prices to rise,  and taking  money out when they
 expect  the  market to fall.  As money is  shifted  in and out,  a fund  incurs
 expenses for buying and selling  securities.  These costs are borne by all fund
 shareholders,  including the long-term investors who do not generate the costs.
 Therefore,  the Fund  discourages  short-term  trading by, among other  things,
 limiting the number of exchanges it permits.
--------------------------------------------------------------------------------

 THE VANGUARD FUNDS DO NOT PERMIT MARKET-TIMING. DO NOT INVEST IN THIS FUND IF
YOU ARE A MARKET-TIMER.

The Fund has adopted the following policies,  among others, to discourage short-
term   trading:

o    The Fund  reserves  the right to  reject  any  purchase  request--including
     exchanges from other  Vanguard  funds--that it regards as disruptive to the
     efficient  management  of the Fund.  A purchase  request  could be rejected
     because  of the  timing  of the  investment  or  because  of a  history  of
     excessive trading by the investor.

o    Telephone  and online  exchanges  generally  are not  accepted  for non-IRA
     accounts.

o    There is a limit on the  number of times you can  exchange  into and out of
     the Fund (see "Exchanges" in the INVESTING WITH VANGUARD section).
o    The Fund reserves the right to stop offering shares at any time.

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                 BALANCED FUNDS
 Balanced  funds are  generally  "middle of the road"  investments  that seek to
 provide some  combination of growth,  income,  and  conservation  of capital by
 investing in a mix of stocks,  bonds, and/or money market instruments.  Because
 the prices of stocks and bonds  often move in  different  directions,  balanced
 funds are able to use rewards  from one type of  investment  to help offset the
 risks from another.
--------------------------------------------------------------------------------

PRIMARY INVESTMENT STRATEGIES


This section explains the strategies that the investment adviser uses in pursuit
of the  Fund's  objective--current  income  and  long-term  growth of income and
capital.  It also  explains  how the adviser  implements  these  strategies.  In
addition,  this section discusses several  important  risks--stock  market risk,
interest rate risk,  income risk,  credit risk,  and  prepayment  risk--faced by
investors  in the  Fund.  The  Fund's  Board of  Trustees,  which  oversees  the
management of the Fund, may change the Fund's investment objective or strategies
in the interest of shareholders, without a shareholder vote.



<PAGE>

6

MARKET EXPOSURE

STOCKS


About 60% of the Fund's assets are invested in common  stocks,  in an attempt to
replicate  with that portion of the assets the  performance of the Wilshire 5000
Index.



[FLAG] THE FUND IS SUBJECT TO STOCK MARKET RISK,  WHICH IS THE CHANCE THAT STOCK
PRICES OVERALL WILL DECLINE OVER SHORT OR EVEN LONG PERIODS.  STOCK MARKETS TEND
TO MOVE IN CYCLES, WITH PERIODS OF RISING PRICES AND PERIODS OF FALLING PRICES.


 To illustrate  the  volatility of stock prices,  the following  table shows the
best,  worst,  and average total returns for the U.S.  stock market over various
periods as measured by the Standard & Poor's 500 Index,  a widely used barometer
of market  activity.  (Total returns  consist of dividend  income plus change in
market  price.)  Note that the returns  shown do not include the costs of buying
and selling  stocks or other  expenses  that a real-world  investment  portfolio
would  incur.  Note,  also,  that the gap between best and worst tends to narrow
over the long term.



--------------------------------------------------------------------------------
                          U.S. STOCK MARKET RETURNS (1926-1999)
--------------------------------------------------------------------------------
                 1 YEAR         5 YEARS      10 YEARS    20 YEARS
--------------------------------------------------------------------------------

Best              54.2%         28.6%        19.9%       17.9%
Worst            -43.1         -12.4         -0.9         3.1
Average           13.2          11.0         11.1        11.1
--------------------------------------------------------------------------------


 The table covers all of the 1-, 5-, 10-, and 20-year  periods from 1926 through
1999.  You can see, for example,  that while the average return on common stocks
for all of the 5-year periods was 11.0%,  returns for individual  5-year periods
ranged  from a -12.4%  average  (from  1928  through  1932) to 28.6%  (from 1995
through 1999).  These average returns reflect past performance on common stocks;
you should not regard them as an  indication  of future  returns from either the
stock market as a whole or this Fund in particular,  which invests approximately
40% of its assets in bonds.

 While the Fund's holdings will typically  include the 500 largest stocks in the
Wilshire 5000 Index,  they will not include all of the  securities in the Index.
Instead, the Fund will invest in a representative sample of stocks.

 Keep in mind, too, that while the Wilshire 5000 Index is dominated by large-cap
stocks  (those  contained in the S&P 500 Index),  small- and mid-cap  issues are
also  represented.  The Fund's stock holdings are adjusted on a regular basis to
reflect the Wilshire  5000 Index.  As of December 31, 1999,  about 22.16% of the
market value of the Wilshire 5000 Index was  comprised of  securities  that were
not in the S&P 500 Index.  Stocks of smaller  companies have  historically  been
more volatile  than--and at times have  performed  quite  differently  from--the
stocks of larger companies.


<PAGE>

                                                                               7

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                   LARGE-CAP, MID-CAP, AND SMALL-CAP STOCKS
 Stocks  of  publicly  traded   companies--and  mutual  funds  that  hold  these
 stocks--can be classified by the companies'  market value,  or  capitalization.
 Market capitalization  changes over time, and there is no "official" definition
 of the boundaries of large-,  mid-, and small-cap  stocks.  Vanguard  generally
 defines  large-capitalization  (large-cap)  funds as those  holding  stocks  of
 companies whose  outstanding  shares have a market value exceeding $12 billion;
 mid-cap funds as those holding  stocks of companies with a market value between
 $1 billion and $12 billion;  and  small-cap  funds as those  typically  holding
 stocks  of  companies  with a market  value of less than $1  billion.  Vanguard
 periodically reassesses these classifications.
--------------------------------------------------------------------------------

BONDS

About 40% of the Fund's  assets are invested in bonds in an attempt to replicate
with that portion of the assets the performance of the Lehman Brothers Aggregate
Bond Index.


[FLAG] THE FUND IS SUBJECT TO INTEREST RATE RISK,  WHICH IS THE CHANCE THAT BOND
PRICES  OVERALL  WILL  DECLINE  OVER  SHORT OR EVEN LONG  PERIODS  DUE TO RISING
INTEREST  RATES.  INTEREST  RATE RISK SHOULD BE MODERATE FOR  SHORTER-TERM  BOND
FUNDS  AND HIGH FOR  LONGER-TERM  BOND  FUNDS.  BECAUSE  THE FUND  INVESTS  IN A
PORTFOLIO OF BONDS WITH AN INTERMEDIATE AVERAGE MATURITY (5-10 YEARS),  INTEREST
RATE RISK IS MODERATE.


--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                            BONDS AND INTEREST RATES
 As a rule,  when interest  rates rise,  bond prices fall.  The opposite is also
 true:  Bond  prices go up when  interest  rates  fall.  Why do bond  prices and
 interest rates move in opposite  directions?  Let's assume that you hold a bond
 offering a 5% yield. A year later, interest rates are on the rise and bonds are
 offered with a 6% yield. With higher-yielding  bonds available,  you would have
 trouble selling your 5% bond for the price you  paid--causing you to lower your
 asking price.  On the other hand,  if interest  rates were falling and 4% bonds
 were being  offered,  you should be able to sell your 5% bond for more than you
 paid.
--------------------------------------------------------------------------------

 Although bonds are often thought to be less risky than stocks,  there have been
periods when bond prices have fallen significantly due to rising interest rates.
For instance, prices of long-term bonds fell by almost 48% between December 1976
and September 1981.

 To  illustrate  the  volatility of bond prices,  the following  table shows the
effect of both a 1% and a 2%  change  (both up and  down) in  interest  rates on
three bonds of different maturities, each with a face value of $1,000.


<PAGE>

8

--------------------------------------------------------------------------------
                      HOW INTEREST RATE CHANGES AFFECT THE
                             VALUE OF A $1,000 BOND*
--------------------------------------------------------------------------------
                              AFTER A 1%   AFTER A 1%   AFTER A 2%    AFTER A 2%
TYPE OF BOND (MATURITY)        INCREASE     DECREASE     INCREASE      DECREASE
--------------------------------------------------------------------------------
Short-Term (2.5 years)           $978        $1,023        $956         $1,046
Intermediate-Term (10 years)      932         1,074         870          1,156
Long-Term (20 years)              901         1,116         816          1,251
--------------------------------------------------------------------------------
*Assuming a 7% yield.
--------------------------------------------------------------------------------

 These  figures  are for  illustration  only and  should not be  regarded  as an
indication  of  future  returns  from the bond  market as a whole or the Fund in
particular.

 Changes in interest rates will affect bond income as well as bond prices.

[FLAG THE FUND IS SUBJECT  TO INCOME  RISK,  WHICH IS THE  CHANCE  THAT A FUND'S
DIVIDENDS  (INCOME) WILL DECLINE DUE TO FALLING  INTEREST RATES.  INCOME RISK IS
GENERALLY THE GREATEST FOR  SHORT-TERM  BOND FUNDS,  AND THE LEAST FOR LONG-TERM
BOND FUNDS.

[FLAG]  BECAUSE  IT  INVESTS IN  MORTGAGE-BACKED  BONDS,  THE FUND IS SUBJECT TO
PREPAYMENT  RISK,  WHICH IS THE CHANCE THAT DURING  PERIODS OF FALLING  INTEREST
RATES, A MORTGAGE-BACKED  BOND ISSUER WILL "CALL"--OR  REPAY--A  HIGHER-YIELDING
BOND  BEFORE ITS  MATURITY  DATE.  IF A BOND IS CALLED,  THE FUND WOULD LOSE THE
OPPORTUNITY FOR ADDITIONAL PRICE  APPRECIATION,  AND WOULD BE FORCED TO REINVEST
THE UNANTICIPATED PROCEEDS AT A LOWER INTEREST RATE. AS A RESULT, THE FUND WOULD
EXPERIENCE A DECLINE IN INCOME.

 Since the Fund invests only a portion of its assets in  mortgage-backed  bonds,
the risk to the Fund is limited.


[FLAG]  THE FUND IS  SUBJECT TO CREDIT  RISK,  WHICH IS THE  CHANCE  THAT A BOND
ISSUER WILL FAIL TO PAY INTEREST AND PRINCIPAL IN A TIMELY MANNER.


 The credit  quality of the Fund is  expected  to be very high,  and thus credit
risk should be low. The weighted  average credit quality of the Fund's holdings,
as rated by Moody's Investors Service, as of June 30, 2000, was ..


 To a limited  extent,  the Fund is also  exposed  to event  risk,  which is the
chance  that  corporate  fixed-income  securities  held by the Fund may suffer a
substantial  decline  in credit  quality  and  market  value due to a  corporate
restructuring or other corporate event.

 Finally, because stock and bond prices often move in different directions,  the
Fund's bond holdings help to dampen--but not eliminate--some of the stock market
volatility experienced by the Fund. Likewise,  changes in interest rates may not
have as  dramatic an effect on the Fund as they would on a fund made up entirely
of bonds.


<PAGE>

                                                                               9

--------------------------------------------------------------------------------
PLAIN TALK ABOUT
                                 BOND MATURITIES
 A bond is issued with a specific maturity  date--the date when the bond issuer,
 or seller,  must pay back the bond's initial value (known as its "face value").
 Bond  maturities  generally  range from less than one year  (short-term)  to 30
 years (long-term).  The longer a bond's maturity,  the more risk you, as a bond
 investor,  face as interest  rates  rise--but  also the more interest you could
 receive.  Long-term  bonds are more  suitable  for  investors  willing  to take
 greater risks in hopes of higher yields;  short-term  bond investors  should be
 willing to accept lower yields in return for less  fluctuation  in the value of
 their investment.
--------------------------------------------------------------------------------

SECURITY SELECTION

INDEXING METHODS

In  seeking  to track a  particular  index,  a fund may use one of two  indexing
methods to select the stocks or bonds in which it invests.

 Some index funds hold each stock or bond found in their target indexes in about
the same proportions as represented in the indexes  themselves.  For example, if
5% of the S&P 500 Index were made up of the stock of a specific company,  a fund
tracking that index would invest about 5% of its assets in that company.

 Other index funds may use a different  selection  process.  Because it would be
impractical to buy and sell all of the  securities  represented by an index (the
Wilshire 5000 Index, for example, included more than 7,000 stocks as of December
31, 1999), many funds tracking these larger indexes use a "sampling"  technique.
Using a sophisticated  computer program, these funds select securities that will
recreate   their  target   indexes  in  terms  of  industry,   size,  and  other
characteristics. For instance, if 10% of the Wilshire 5000 Index were made up of
utility  stocks,  the Balanced  Index Fund would allocate about 10% of its stock
investment to the utility stocks of the index with similar characteristics.

[FLAG] THE FUND IS SUBJECT TO INDEX SAMPLING RISK,  WHICH IS THE CHANCE THAT THE
SECURITIES SELECTED WILL NOT PROVIDE INVESTMENT PERFORMANCE MATCHING THAT OF THE
TARGET INDEXES. INDEX SAMPLING RISK SHOULD BE LOW.

STOCKS

The Fund's common stock portfolio is designed to have investment characteristics
that  parallel  those  of the  Wilshire  5000  Index.  The Fund is  expected  to
replicate  approximately  1,000 of the largest  securities  in the Wilshire 5000
Index as measured by market capitalization,  plus a representative sample of the
remainder,  which are selected primarily on the basis of market  capitalization,
industry weightings, and other fundamental characteristics.  Typically, the Fund
holds a total of between 3,000 and 3,500 stocks.

BONDS

The Fund's bond portfolio is designed to have  investment  characteristics  that
parallel   those  of  the  Lehman   Brothers   Aggregate  Bond  Index,  a  broad
market-weighted  index that encompasses  five major classes of  investment-grade
fixed-income   securities  in  the  United  States:  U.S.  Treasury  and  agency
securities,   corporate   bonds,   mortgage-backed   securities,   international
dollar-denominated  bonds, and asset-backed  securities with maturities  greater
than one year. The Fund will invest in a  representative  sample of fixed-income
securities in


<PAGE>

10

the index, which, taken together, are expected to perform similarly to the
index. These securities are described further as follows:

o    U.S.  government  securities  include U.S. Treasury and agency bonds, which
     represent  loans by an investor to the U.S.  Treasury  Department or a wide
     variety of governmental agencies and  instrumentalities.  Timely payment of
     principal  and interest on these bonds is  guaranteed by the full faith and
     credit of the U.S. government; some agency bonds have the same guarantee.
o    Corporate bonds are IOUs issued by businesses that want to borrow money for
     some  purpose--often to develop a new product or service,  to expand into a
     new market,  or to buy another  company.  As with other types of bonds, the
     issuer  promises  to repay the  principal  on a  specific  date and to make
     interest  payments in the meantime.  The amount of interest offered depends
     both on market  conditions and on the financial  health of the  corporation
     issuing the bonds; a company whose credit rating is not strong will have to
     offer a relatively high interest rate to obtain buyers for its bonds.
o    Mortgage-backed  securities  represent  interests  in  underlying  pools of
     mortgages.  Unlike  ordinary  bonds,  which  generally  pay a fixed rate of
     interest  at regular  intervals  and then repay  principal  upon  maturity,
     mortgage-backed  bonds pay both  interest  and  principal  as part of their
     regular payments. Because the mortgages underlying the bonds can be prepaid
     at any time by homeowners or corporate borrowers, mortgage-backed bonds are
     subject to prepayment risk, as discussed earlier in this prospectus.  These
     types of bonds are issued by a number of government agencies, including the
     Government  National  Mortgage  Association  (GNMA),  often  referred to as
     "Ginnie  Mae," the Federal  Home Loan  Mortgage  Corporation  (FHLMC),  the
     Federal National Mortgage  Association (FNMA), often referred to as "Fannie
     Mae," and the Federal Housing Authority (FHA). GNMA bonds are guaranteed by
     the full faith and credit of the U.S.  government as to the timely  payment
     of principal and interest;  bonds issued by other  government  agencies are
     not.  (Note:  The  Balanced  Index  Fund may also  invest  in  conventional
     mortgage-backed securities,  which are packaged by private corporations and
     are not guaranteed by the U.S. government.)
o    International  dollar-denominated  bonds  are  bonds  denominated  in  U.S.
     dollars issued by foreign  governments  and  companies.  Because the bond's
     value is designated in dollars  rather than in the currency of the issuer's
     country,  the investor is not exposed to currency risk;  rather, the issuer
     assumes the risk, usually to attract U.S. investors.
o    Asset-backed  securities  are bonds backed by an underlying  pool of assets
     such as automobile loans,  credit card loans, and home equity loans.  These
     securities are structured  with varying  amounts of credit risk,  depending
     primarily  on the  quality of the  underlying  assets.  They are  generally
     issued  by  private  corporations  and  are  not  guaranteed  by  the  U.S.
     government.  Asset-backed bonds are subject to prepayment risk as discussed
     earlier in this prospectus.

     In "sampling" its target index,  the Fund has the flexibility to overweight
particular types of bonds relative to their  representation  in the index.  This
normally involves substituting  corporate bonds for government bonds of the same
maturity.  The corporate  substitution strategy increases the Fund's income, but
also marginally increases exposure to credit risk, which is explained on page 8.
The Fund limits corporate  substitutions to bonds with less than approximately 4
years' remaining  maturity,  and the Fund will limit corporate  substitutions to
approximately 15% of its net assets.

 The Fund is generally managed without regard to tax ramifications.



<PAGE>

                                                                              11

TURNOVER RATE

Although the Fund  generally  seeks to invest for the long term,  it retains the
right to sell  securities  regardless of how long the securities have been held.
The Fund's average  turnover rate for the past five years has been about 25%. (A
turnover  rate of 100% would occur,  for example,  if the Fund sold and replaced
securities valued at 100% of its total net assets within a one-year period.)


--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  TURNOVER RATE
Before  investing in a mutual fund,  you should review its turnover  rate.  This
gives an  indication  of how  transaction  costs could affect the fund's  future
returns.  In general,  the greater the volume of buying and selling by the fund,
the greater the impact that brokerage  commissions and other  transaction  costs
will have on its return. Also, funds with high turnover rates may be more likely
to generate  capital gains that must be  distributed to  shareholders  as income
subject  to  taxes.  As of June 30,  2000,  the  average  turnover  rate for all
domestic   hybrid  funds  (a  category   that  includes   balanced   funds)  was
approximately .%, according to Morningstar, Inc.
--------------------------------------------------------------------------------



OTHER INVESTMENT POLICIES AND RISKS

Besides  investing in U.S.  common  stocks and bonds,  the Fund may make certain
other  kinds of  investments  to achieve its  objective.  The Fund may invest in
fixed-income  securities not in the target index  (non-public,  investment grade
securities--generally  referred to as 144A securities--as well as smaller public
issues or medium term notes not  included in the index due to their  size).  The
vast majority of these securities will have characteristics and risks similar to
those in the target index.  The Fund may also purchase money market  instruments
and certain  derivatives  in order to manage cash flow into and out of the Fund,
reduce  transaction  costs,  or add value when these  instruments  are favorably
priced.

     The Fund may invest, to a limited extent, in foreign securities.

     The Fund may also invest,  to a limited  extent,  in stock and bond futures
and options  contracts,  which are traditional types of derivatives.  Losses (or
gains)  involving  futures  can  sometimes  be  substantial--in  part  because a
relatively small price movement in a futures contract may result in an immediate
and  substantial  loss (or gain) for a fund.  This Fund will not use futures for
speculative  purposes  or as  leveraged  investments  that  magnify the gains or
losses of an  investment.  The Fund's  obligation to purchase  securities  under
futures contracts will not exceed 20% of its total assets.

 The reasons  for which the Fund will  invest in futures  and options  are:

o    To keep cash on hand to meet  shareholder  redemptions or other needs while
     simulating full investment in stocks and bonds.
o    To reduce the Fund's  transaction costs or add value when these instruments
     are favorably priced.


<PAGE>

12

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                   DERIVATIVES
 A  derivative  is a financial  contract  whose value is based on (or  "derived"
 from) a traditional  security (such as a stock or a bond),  an asset (such as a
 commodity  like gold),  or a market index (such as the S&P 500 Index).  Futures
 and options are derivatives  that have been trading on regulated  exchanges for
 more  than  two  decades.  These  "traditional"  derivatives  are  standardized
 contracts  that can  easily be bought  and sold,  and whose  market  values are
 determined and published daily. It is these  characteristics that differentiate
 futures and options from the relatively new types of  derivatives.  If used for
 speculation or as leveraged  investments,  derivatives  can carry  considerable
 risks.
--------------------------------------------------------------------------------

THE FUND AND VANGUARD


The Fund is a member of The Vanguard  Group, a family of more than 35 investment
companies with more than . funds holding assets worth more than $. billion.  All
of the Vanguard funds share in the expenses associated with business operations,
such as personnel, office space, equipment, and advertising.


 Vanguard also provides marketing services to the funds.  Although  shareholders
do not pay sales  commissions  or 12b-1  distribution  fees,  each fund pays its
allocated share of The Vanguard Group's marketing costs.

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                      VANGUARD'S UNIQUE CORPORATE STRUCTURE
 The Vanguard  Group is truly a MUTUAL mutual fund company.  It is owned jointly
 by the funds it  oversees  and thus  indirectly  by the  shareholders  in those
 funds. Most other mutual funds are operated by for-profit  management companies
 that may be owned by one person, by a group of individuals, or by investors who
 own the management company's stock. By contrast, Vanguard provides its services
 on an "at-cost"  basis, and the funds' expense ratios reflect only these costs.
 No separate  management  company reaps profits or absorbs losses from operating
 the funds.
--------------------------------------------------------------------------------

INVESTMENT ADVISER


The Vanguard Group (Vanguard), P.O. Box 2600, Valley Forge, PA 19482, founded in
1975,  serves as the Fund's adviser through its Core Management and Fixed Income
Groups.  As of the fiscal year ended June 30, 2000,  Vanguard  served as adviser
for about $. billion in assets.  Vanguard  manages the Fund on an at-cost basis,
subject to the control of the Trustees and officers of the Fund.  For the fiscal
year ended June 30,  2000,  the  investment  advisory  expenses  represented  an
effective annual rate of approximately .%.


 The adviser is authorized to choose  brokers-dealers to handle the purchase and
sale of the Fund's securities, and to seek out the best available price and most
favorable execution for all transactions.  Also, the Fund may direct the adviser
to use a particular  broker for certain  transactions in exchange for commission
rebates or research services provided to the Fund.


<PAGE>

                                                                              13

 In the interest of obtaining better execution of a transaction, the adviser may
at times choose brokers who charge higher  commissions.  If more than one broker
can obtain  the best  available  price and most  favorable  execution,  then the
adviser is  authorized  to choose a broker who, in  addition  to  executing  the
transaction, will provide research services to the adviser or the Fund.

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                               THE FUND'S ADVISER
 The individuals  primarily  responsible  for overseeing the Fund's  investments
 are:

 GEORGE U. SAUTER, Managing Director of Vanguard and head of Vanguard's Core
 Management Group; has worked in investment management since 1985; primary
 responsibility for Vanguard's stock indexing investment policy and strategy
 since joining the company in 1987; has served as the portfolio manager for
 the stock portion of the Fund since inception; A.B., Dartmouth College;
 M.B.A., University of Chicago.

 IAN A. MACKINNON, Managing Director of Vanguard and head of Vanguard's Fixed
 Income Group; has worked in investment management since 1974; primary
 responsibility for Vanguard's internal fixed-income policy and strategy since
 joining the company in 1981; has been responsible for overseeing the
 portfolio management of the bond portion of the Fund since inception; B.A.,
 Lafayette College; M.B.A., Pennsylvania State University.

 FELIX B. LIM, has worked in investment management since completing his
 education in 1996; joined Vanguard in January 1999; worked as a credit
 analyst until January 2000; B.A. and M.S., University of Pennsylvania
 (Wharton School).
--------------------------------------------------------------------------------

DIVIDENDS, CAPITAL GAINS, AND TAXES

The Fund  distributes to shareholders  virtually all of its net income (interest
and dividends,  less  expenses),  as well as any capital gains realized from the
sale of its holdings. Income dividends generally are distributed in March, June,
September,  and  December;   capital  gains  distributions  generally  occur  in
December.   In  addition,   the  Fund  may  occasionally  be  required  to  make
supplemental  dividend or capital gains  distributions at some other time during
the year.

 Your dividend and capital gains  distributions will be reinvested in additional
Fund shares and accumulate on a tax-deferred  basis if you are investing through
an  employer-sponsored  retirement  or savings  plan.  You will not owe taxes on
these  distributions  until you begin  withdrawals  from the  plan.  You  should
consult your plan administrator,  your plan's Summary Plan Description,  or your
tax adviser about the tax consequences of plan withdrawals.


<PAGE>

14

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  DISTRIBUTIONS
 As a  shareholder,  you are  entitled  to your share of the fund's  income from
 interest and  dividends,  and gains from the sale of  investments.  You receive
 such  earnings as either an income  dividend or a capital  gains  distribution.
 Income  dividends  come from both the  dividends  that the fund  earns from its
 holdings  and  the  interest  it  receives  from  its  money  market  and  bond
 investments.  Capital gains are realized whenever the fund sells securities for
 higher prices than it paid for them. These capital gains are either  short-term
 or long-term, depending on whether the fund held the securities for one year or
 less, or more than one year.
--------------------------------------------------------------------------------

SHARE PRICE


The Fund's share price,  called its net asset value,  or NAV, is calculated each
business day after the close of regular  trading on the New York Stock  Exchange
(the NAV is not  calculated  on  holidays  or other  days when the  Exchange  is
closed). The Fund computes a separate net asset value for each of its share
classes. This is done by dividing the net assets attributed to each share class
by the number of Fund shares outstanding for each share class.

                              NET ASSETS
NET ASSET VALUE =   -------------------------------
                     NUMBER OF SHARES OUTSTANDING


 Knowing the daily net asset value is useful to you as a shareholder  because it
indicates the current value of your  investment.  The Fund's NAV,  multiplied by
the  number of  shares  you own,  gives you the  dollar  amount  you would  have
received had you sold all of your shares back to the Fund that day.

 A NOTE ON PRICING:  The Fund's investments will be priced at their market value
when market  quotations  are readily  available.  When these  quotations are not
readily  available,  investments will be priced at their fair value,  calculated
according to procedures adopted by the Fund's Board of Trustees.


 The Fund's  share price can be found daily in the mutual fund  listings of most
major newspapers under the heading "Vanguard Index Funds." Different  newspapers
use different  abbreviations of the Fund's name, but the most common is BALANCED
for the Fund's Investor Shares.



<PAGE>

                                                                              15

FINANCIAL HIGHLIGHTS

The following financial  highlights table is intended to help you understand the
Fund's financial  performance for the past five years,  and certain  information
reflects  financial  results for a single Fund share.  The total  returns in the
table represent the rate that an investor would have earned or lost each year on
an investment  in the Fund  (assuming  reinvestment  of all dividend and capital
gains  distributions).  This  information  has been derived  from the  financial
statements audited by PricewaterhouseCoopers LLP, independent accountants, whose
report--along  with the Fund's financial  statements--is  included in the Fund's
most recent annual report to  shareholders.  You may have the annual report sent
to you without charge by contacting Vanguard.


<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------------------------------
                                                                      VANGUARD BALANCED INDEX FUND--INVESTOR SHARES
                                          SIX MONTHS                            YEAR ENDED DECEMBER 31,
                                               ENDED----------------------------------------------------------------------
                                       JUNE 30, 2000        1999            1998          1997          1996          1995
--------------------------------------------------------------------------------------------------------------------------
<S>                                             <C>        <C>              <C>           <C>           <C>            <C>
NET ASSET VALUE, BEGINNING OF YEAR               $.      $18.48           $16.29        $13.92        $12.77        $10.34
--------------------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
 Net Investment Income                             .         .58             .54          .520           .50          .45
 Net Realized and Unrealized Gain                  .        1.88            2.33         2.525          1.26         2.48
  (Loss) on Investments
                                       -----------------------------------------------------------------------------------
  Total from Investment Operations                 .        2.46            2.87         3.045          1.76         2.93
                                       -----------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net Investment Income              .        (.58)           (.54)        (.530)         (.49)        (.45)
 Distributions from Realized Capital               .        (.14)           (.14)        (.145)         (.12)        (.05)
  Gains
                                       -----------------------------------------------------------------------------------
  Total Distributions                              .        (.72)           (.68)        (.675)         (.61)        (.50)
--------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF YEAR                      $.      $20.22          $18.48        $16.29        $13.92       $12.77
==========================================================================================================================
TOTAL RETURN*                                     .%      13.61%          17.85%        22.24%        13.95%       28.64%
==========================================================================================================================

RATIOS/SUPPLEMENTAL DATA
 Net Assets, End of Year (Millions)               $.      $3,128          $2,004        $1,260          $826         $590
 Ratio of Total Expenses to Average
  Net Assets                                      .%       0.20%           0.21%         0.20%         0.20%        0.20%
 Ratio of Net Investment Income to
  Average Net Assets                              .%       3.18%           3.29%         3.56%         3.69%        3.85%
 Turnover Rate                                    .%         29%             25%           18%         37%**          16%
=========================================================================================================================
</TABLE>

*Turnover rate excluding in-kind redemptions was 30%.


<PAGE>

16

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                  HOW TO READ THE FINANCIAL HIGHLIGHTS TABLE

The Fund began June 30, 2000 with a net asset value (price) of $18.48 per share.
During the period, the Fund earned $. per share from investment income (interest
and dividends) and $. per share from  investments  that had appreciated in value
or that were sold for higher  prices  than the Fund paid for them.

Shareholders  received  $. per share in the form of dividend  and capital  gains
distributions.  A portion of each period's distributions may come from the prior
period's income or capital gains.

The earnings ($. per share) minus the distributions ($. per share) resulted in a
share price of $. at the end of the period.  This was a increase of $. per share
(from $. at the  beginning of the period to $. at the end of the period).  For a
shareholder who reinvested the distributions in the purchase of more shares, the
total return from the Fund was .% for the period.

As of June 30, 2000,  the Fund had $. billion in net assets.  For the period its
expense  ratio was .% ($.  per  $1,000 of net  assets);  and its net  investment
income amounted to .% of its average net assets. It sold and replaced securities
valued at .% of its net assets.
--------------------------------------------------------------------------------


"Standard & Poor's(R),"  "S&P(R)," "S&P 500(R),"  "Standard & Poor's 500,"
and "500" are trademarks of The McGraw-Hill Companies, Inc.


<PAGE>

                                                                              17

INVESTING WITH VANGUARD
The Fund is an investment  option in your  retirement or savings plan. Your plan
administrator  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.

o    If you have any questions about the Fund or Vanguard, including those about
     the Fund's investment objective,  strategies,  or risks, contact Vanguard's
     Participant Access Center, toll-free, at 1-800-523-1188.
o    If you have questions about your account,  contact your plan  administrator
     or the organization that provides recordkeeping services for your plan.

INVESTMENT OPTIONS AND ALLOCATIONS
Your  plan's  specific  provisions  may  allow  you to  change  your  investment
selections,  the amount of your  contributions,  or how your  contributions  are
allocated  among the  investment  choices  available  to you.  Contact your plan
administrator or employee benefits office for more details.

TRANSACTIONS
Contributions,  exchanges,  or redemptions of the Fund's shares are processed as
soon as they have been received by Vanguard in good order. Good order means that
your request includes complete  information on your contribution,  exchange,  or
redemption, and that Vanguard has received the appropriate assets.

 In all cases, your transaction will be based on the Fund's  next-determined net
asset  value  after  Vanguard  receives  your  request  (or,  in the case of new
contributions,  the  next-determined net asset value after Vanguard receives the
order from your plan administrator).  As long as this request is received before
the close of trading on the New York Stock  Exchange,  generally 4 p.m.  Eastern
time, you will receive that day's net asset value.

EXCHANGES
The exchange  privilege (your ability to redeem shares from one fund to purchase
shares of another  fund) may be available to you through your plan.  Although we
make every  effort to maintain  the exchange  privilege,  Vanguard  reserves the
right to revise or terminate this privilege,  limit the amount of an exchange or
reject any exchange,  at any time, without notice.  Because excessive  exchanges
can potentially  disrupt the management of the Fund and increase its transaction
costs,  Vanguard  limits  participant  exchange  activity  to no more  than FOUR
SUBSTANTIVE  "ROUND TRIPS"  THROUGH THE FUND (at least 90 days apart) during any
12-month  period.  A "round  trip" is a redemption  from the Fund  followed by a
purchase back into the Fund.  "Substantive"  means a dollar amount that Vanguard
determines, in its sole discretion, could adversely affect the management of the
Fund.

 Before  making an  exchange to or from  another  fund  available  in your plan,
consider the following:

o    Certain investment options,  particularly funds made up of company stock or
     investment contracts, may be subject to unique restrictions.
o    Make sure to read that fund's prospectus.  Contact  Vanguard's  Participant
     Access Center, toll-free, at 1-800-523-1188 for a copy.
o    Vanguard can accept exchanges only as permitted by your plan.  Contact your
     plan  administrator for details on the exchange policies that apply to your
     plan.


<PAGE>

18

ACCESSING FUND INFORMATION BY COMPUTER

--------------------------------------------------------------------------------
VANGUARD ON THE WORLD WIDE WEB www.vanguard.com
Use your personal computer to visit Vanguard's education-oriented website, which
provides  timely news and  information  about  Vanguard  funds and services;  an
online  "university"  that  offers  a  variety  of  mutual  fund  classes;   and
easy-to-use,  interactive  tools to help you  create  your  own  investment  and
retirement strategies.
--------------------------------------------------------------------------------


<PAGE>

                     (THIS PAGE INTENTIONALLY LEFT BLANK.)

<PAGE>

                     (THIS PAGE INTENTIONALLY LEFT BLANK.)
<PAGE>


GLOSSARY OF INVESTMENT TERMS

ACTIVE MANAGEMENT
An investment approach that seeks to exceed the average returns of the financial
markets.  Active  managers  rely on research,  market  forecasts,  and their own
judgment and experience in selecting securities to buy and sell.

BALANCED FUND
A mutual fund that seeks to provide some combination of income,  capital growth,
and conservation of capital by investing in stocks,  bonds,  and/or money market
instruments.

BOND
A debt security (IOU) issued by a corporation,  government, or government agency
in exchange for the money you lend it. In most  instances,  the issuer agrees to
pay back the loan by a specific date and to make regular interest payments until
that date.

CAPITAL GAINS DISTRIBUTION
Payment to mutual fund  shareholders of gains realized on securities that a fund
has sold at a profit, minus any realized losses.

CREDIT QUALITY
A measure of a bond  issuer's  ability to pay interest and principal in a timely
manner.

DIVIDEND INCOME
Payment to  shareholders  of income from  interest or  dividends  generated by a
fund's investments.

DURATION
A measure of the  sensitivity  of bond--and bond  fund--prices  to interest rate
movements.  For example,  if a bond has a duration of two years, its price would
fall by about 2% when interest  rates rose one  percentage  point.  On the other
hand,  the bond's price would rise by about 2% when  interest  rates fell by one
percentage point.

EXPENSE RATIO
The  percentage  of a fund's  average net assets used to pay its  expenses.  The
expense ratio  includes  management  fees,  administrative  fees,  and any 12b-1
distribution fees.

FACE VALUE
The  amount to be paid at  maturity  of a bond;  also  known as the par value or
principal.

INDEX
An unmanaged group of securities whose overall performance is used as a standard
to measure investment performance.

INVESTMENT GRADE
A bond whose credit quality is considered by independent bond-rating agencies to
be sufficient to ensure timely  payment of principal and interest  under current
economic  circumstances.  Bonds rated in one of the four highest  categories are
considered "investment grade."

MATURITY
The date when a bond issuer agrees to repay the bond's principal, or face value,
to the bond's buyer.

NET ASSET VALUE (NAV)
The market value of a mutual fund's total assets, minus liabilities,  divided by
the  number of shares  outstanding.  The value of a single  share is called  its
share value or share price.

PASSIVE MANAGEMENT
A low-cost  investment strategy in which a mutual fund attempts to match--rather
than  outperform--  a  particular  stock or bond  market  index.  Also  known as
indexing.

PRICE/EARNINGS (P/E) RATIO
The current share price of a stock,  divided by its per-share earnings (profits)
from the past year. A stock selling for $20, with earnings of $2 per share,  has
a price/earnings ratio of 10.

TOTAL RETURN
A percentage change,  over a specified time period, in a mutual fund's net asset
value,  with the ending net asset value adjusted to account for the reinvestment
of all distributions of dividends and capital gains.

VOLATILITY
The  fluctuations  in value of a mutual  fund or other  security.  The greater a
fund's volatility, the wider the fluctuations between its high and low prices.

YIELD
Income  (interest  or  dividends)  earned  by  an  investment,  expressed  as  a
percentage of the investment's price.


<PAGE>

                                                  [SHIP]
                                                  [THE VANGUARD GROUP(R)]
                                                  Institutional Division
                                                  Post Office Box 2900
                                                  Valley Forge, PA 19482-2900

FOR MORE INFORMATION
If you'd like more information about
Vanguard Admiral Funds, the
following documents are available
free upon request:

ANNUAL/SEMIANNUAL REPORTS
TO SHAREHOLDERS
Additional information about the
Funds' investments is available in
the Funds' annual and semiannual
reports to shareholders.

STATEMENT OF ADDITIONAL
INFORMATION (SAI)
The SAI provides more detailed
information about the Funds.

The current annual and semiannual
reports and the SAI are
incorporated by reference into
(and are thus legally a part of)
this prospectus.

To receive a free copy of the latest
annual or semiannual report or the
SAI, or to request additional
information about the Funds or other
Vanguard funds, please contact us
as follows:

THE VANGUARD GROUP
PARTICIPANT ACCESS CENTER
P.O. BOX 2900
VALLEY FORGE, PA 19482-2900

TELEPHONE:
1-800-523-1188

TEXT TELEPHONE:
1-800-523-8004

WORLD WIDE WEB:
WWW.VANGUARD.COM



INFORMATION PROVIDED BY THE
SECURITIES AND EXCHANGE
COMMISSION (SEC)

You can review and copy information
about the Funds (including the SAI)
at the SEC's Public Reference Room
in Washington, DC. To find out more
about this public service, call the SEC
at 1-202-942-8090. Reports and
other information about the Funds
are also available on the SEC's
website (www.sec.gov), or you can
receive copies of this information,
for a fee, by electronic request at the
following e-mail address:
[email protected], or by writing the
Public Reference Section, Securities
and Exchange Commission,
Washington, DC 20549-0102.

Funds' Investment Company Act
file number: 811-7023


(C) 2000 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation,
Distributor.


I002N-09/2000



<PAGE>

                                     PART B

                          VANGUARD BALANCED INDEX FUND
                                   (THE FUND)

                       STATEMENT OF ADDITIONAL INFORMATION

                                SEPTEMBER ., 2000

This Statement is not a prospectus  but should be read in  conjunction  with the
Fund's current Prospectus (dated September ., 2000). To obtain,  without charge,
the Prospectus or the most recent Annual Report to Shareholders,  which contains
the Fund's  financial  statements as hereby  incorporated  by reference,  please
call:


                     INVESTOR INFORMATION DEPARTMENT:
                              1-800-662-7447

                            TABLE OF CONTENTS

DESCRIPTION OF THE FUND......................................................B-1
INVESTMENT POLICIES .........................................................B-3
FUNDAMENTAL INVESTMENT LIMITATIONS...........................................B-7
YIELD AND TOTAL RETURN.......................................................B-9
PURCHASE OF SHARES..........................................................B-10
SHARE PRICE.................................................................B-11
REDEMPTION OF SHARES........................................................B-12
MANAGEMENT OF THE FUND......................................................B-12
PORTFOLIO TRANSACTIONS......................................................B-15
FINANCIAL STATEMENTS........................................................B-16
COMPARATIVE INDEXES.........................................................B-16
APPENDIX A--DESCRIPTION OF BOND RATINGS.....................................B-19


                             DESCRIPTION OF THE FUND

ORGANIZATION

Vanguard  Balanced  Index Fund was  organized as Vanguard  Balanced  Index Fund,
Inc.,  a  Maryland  corporation,  in 1992,  and was  reorganized  as a  Delaware
business  trust in July 1998.  The Fund is  registered  with the  United  States
Securities and Exchange Commission (the Commission) under the Investment Company
Act of 1940 (the  1940 Act) as an  open-end  diversified  management  investment
company.  The Fund has the ability to offer  multiple  portfolios and classes of
shares.  There is no limit on the number of full and fractional  shares that the
Fund may issue for a single  portfolio  or class of shares.  The Fund  currently
offers a single portfolio (also known as Vanguard  Balanced Index Fund,) and two
classes of shares (Investor Shares and Admiral Shares).


SERVICE PROVIDERS

     CUSTODIAN.   First  Union  National  Bank,   PA4943,   530  Walnut  Street,
Philadelphia,  Pennsylvania 19106, serves as the Fund's custodian. The custodian
is  responsible  for  maintaining  the Fund's  assets and keeping all  necessary
accounts and records of Fund assets.

     INDEPENDENT ACCOUNTANTS.  PricewaterhouseCoopers LLP, 30 South 17th Street,
Philadelphia,  Pennsylvania 19103, serves as the Fund's independent accountants.
The  accountants  audit  financial  statements  for the Fund and  provide  other
related services.

     TRANSFER AND DIVIDEND-PAYING AGENT. The Fund's transfer and dividend-paying
agent is The Vanguard Group, Inc., 100 Vanguard Boulevard, Malvern, Pennsylvania
19355.

                                       B-1

<PAGE>

CHARACTERISTICS OF THE FUND'S SHARES

  RESTRICTIONS  ON HOLDING OR DISPOSING OF SHARES.  There are no restrictions on
the right of shareholders to retain or dispose of the Fund's shares,  other than
the possible  future  termination  of the Fund.  The Fund may be  terminated  by
reorganization  into another mutual fund or by liquidation  and  distribution of
the  assets  of the  affected  fund.  Unless  terminated  by  reorganization  or
liquidation, the Fund will continue indefinitely.

  SHAREHOLDER  LIABILITY.  The  Fund is  organized  under  Delaware  law,  which
provides  that  shareholders  of a  business  trust  are  entitled  to the  same
limitations of personal  liability as  shareholders  of a corporation  organized
under Delaware law. Effectively,  this means that a shareholder of the Fund will
not be personally liable for payment of the Fund's debts except by reason of his
or her own conduct or acts. In addition,  a shareholder  could incur a financial
loss on account of a Fund  obligation  only if the Fund itself had no  remaining
assets with which to meet such  obligation.  We believe that the  possibility of
such a situation arising is extremely remote.

  DIVIDEND  RIGHTS.  The  shareholders  of a fund are  entitled  to receive  any
dividends or other distributions declared for such fund. No shares have priority
or  preference  over  any  other  shares  of  the  same  fund  with  respect  to
distributions. Distributions will be made from the assets of a fund, and will be
paid ratably to all  shareholders of the fund (or class) according to the number
of shares of such fund (or class) held by  shareholders  on the record date. The
amount of income  dividends per share may vary between separate share classes of
the same fund based upon  differences  in the way that  expenses  are  allocated
between share classes pursuant to a multiple class plan.

  VOTING  RIGHTS.  Shareholders  are  entitled  to vote on a  matter  if:  (i) a
shareholder  vote is required  under the 1940 Act;  (ii) the matter  concerns an
amendment to the Declaration of Trust that would adversely  affect to a material
degree the rights and  preferences  of the shares of any class or fund; or (iii)
the Trustees determine that it is necessary or desirable to obtain a shareholder
vote.  The 1940 Act requires a  shareholder  vote under  various  circumstances,
including to elect or remove  Trustees upon the written  request of shareholders
representing 10% or more of the Fund's net assets, and to change any fundamental
policy of the Fund. Shareholders of the Fund receive one vote for each dollar of
net  asset  value  owned on the  record  date,  and a  fractional  vote for each
fractional dollar of net asset value owned on the record date. However, only the
shares of the fund affected by a particular  matter are entitled to vote on that
matter.  Voting  rights  are  noncumulative  and  cannot be  modified  without a
majority vote.

  LIQUIDATION RIGHTS.  In the event of liquidation, shareholders will be
entitled to receive a pro rata share of the Fund's net assets.

  PREEMPTIVE RIGHTS.  There are no preemptive rights associated with the Fund's
shares.

  CONVERSION RIGHTS.  There are no conversion rights associated with the Fund's
shares.

  REDEMPTION PROVISIONS.  The Fund's redemption provisions are described in its
current prospectus and elsewhere in this Statement of Additional Information.

  SINKING FUND PROVISIONS.  The Fund has no sinking fund provisions.

  CALLS OR ASSESSMENT. The Fund's shares, when issued, are fully paid and
non-assessable.


TAX STATUS OF THE FUND

The Fund  intends to continue  to qualify as a  "regulated  investment  company"
under  Subchapter M of the Internal  Revenue Code. This special tax status means
that the Fund will not be liable for  federal  tax on income and  capital  gains
distributed to shareholders.  In order to preserve its tax status, the Fund must
comply with certain  requirements.  If the Fund fails to meet these requirements
in any  taxable  year,  it will  be  subject  to tax on its  taxable  income  at
corporate rates, and all distributions from earnings and profits,  including any
distributions of net tax-exempt  income and net long-term capital gains, will be
taxable to  shareholders  as ordinary  income.  In  addition,  the Fund could be
required to recognize unrealized gains, pay substantial taxes and

                                       B-2

<PAGE>

interest, and make substantial  distributions before regaining its tax status as
a regulated investment company.

                               INVESTMENT POLICIES
The following policies supplement the Fund's investment policies as set forth in
the Prospectus.

  REPURCHASE  AGREEMENTS.  The Fund may  invest in  repurchase  agreements  with
commercial  banks,  brokers,  or dealers to generate income from its excess cash
balances. A repurchase agreement is an agreement under which the Fund acquires a
fixed-income  security (generally a security issued by the U.S. Government or an
agency  thereof,  a banker's  acceptance  or a  certificate  of deposit)  from a
Federal  Reserve  member  bank with  minimum  assets of at least $2 billion or a
registered securities 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  the  Fund's   custodian  bank  until
repurchased.  In addition,  the Fund's Board of Trustees will monitor the Fund's
repurchase  agreement  transactions  generally and will establish guidelines and
standards  for review of the  creditworthiness  of any bank,  broker,  or dealer
party to a repurchase agreement with the Fund.

  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 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  bankruptcy  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 adviser  acknowledges  these risks,  it is expected
that they will be controlled through careful monitoring procedures.

  LENDING  OF  SECURITIES.  The  Fund  may  lend  its  securities  to  qualified
institutional  investors (typically brokers,  dealers,  banks or other financial
institutions)  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 terms, the structure,  and the aggregate amount of such
loans must be consistent with the 1940 Act, and the rules or  interpretations of
the Commission  thereunder.  These provisions limit the amount of securities the
fund may lend to 33 1/3% of the Fund's  total  assets,  and require that (a) the
borrower  pledge and maintain  with the Fund  collateral  consisting  of cash, a
letter of  credit  issued by a  domestic  U.S.  bank,  or  securities  issued or
guaranteed  by the United  States  Government  having 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 (the  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 Trustees.

                                       B-3

<PAGE>

  VANGUARD  INTERFUND  LENDING  PROGRAM.  The Commission has issued an exemptive
order  permitting the Fund and other Vanguard funds to participate in Vanguard's
interfund  lending  program.  This program  allows the Vanguard  funds to borrow
money from and loan money to each other for temporary or emergency purposes. The
program is subject to a number of conditions,  including the requirement that no
fund may borrow or lend money  through  the  program  unless it  receives a more
favorable  interest rate than is available  from a typical bank for a comparable
transaction. In addition, a Vanguard fund may participate in the program only if
and to the  extent  that  such  participation  is  consistent  with  the  fund's
investment  objective and other investment  policies.  The Boards of Trustees of
the Vanguard  funds are  responsible  for ensuring  that the  interfund  lending
program operates in compliance with all conditions of the Commission's exemptive
order.

  FUTURES  CONTRACTS,  OPTIONS  ON  FUTURES  CONTRACTS,   WARRANTS,  CONVERTIBLE
SECURITIES,  AND SWAP  AGREEMENTS.  The Fund may enter into  futures  contracts,
warrants,  options  on  futures  contracts,  convertible  securities,  and  swap
agreements  for the purpose of  simulating  full  investment  in the  underlying
Indexes and reducing transaction 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 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 initial  margin  deposit in
cash or  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 with deposits
that may range  upward  from less  than 5% of the  value of the  contract  being
traded.  The Fund's initial margin requirement is ordinarily in the form of U.S.
Treasury securities.

  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 initial 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  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 except to the extent that
the aggregate initial margins and premiums required to establish any non-hedging
positions do not exceed five percent of the

                                       B-4

<PAGE>

value of the  Fund.  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.

  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.

  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  future stock  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 will be 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
option.

  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

                                       B-5

<PAGE>

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 as of the end of the
year as well as those  actually  realized  during the year. In these 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.  Gains and  losses on
certain other futures contracts  (primarily non-U.S.  futures contracts) are not
recognized  until the  contracts  are closed and are  treated  as  long-term  or
short-term  depending on the holding  period of the  contract.  Sales of futures
contracts  which  are  intended  to  hedge  against  a  change  in the  value of
securities  held by a 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 a 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 or currencies.  It is  anticipated  that any net gain
recognized  on  futures  contracts  will be  considered  qualifying  income  for
purposes of the 90% requirement.

  The Fund will distribute to shareholders  annually any net capital gains which
have been  recognized for federal  income tax purposes 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.

  FEDERAL TAX  TREATMENT  OF NON-U.S.  TRANSACTIONS.  Special  rules  govern the
Federal income tax treatment of certain  transactions  denominated in terms of a
currency  other than the U.S.  dollar or determined by reference to the value of
one or more  currencies  other than the U.S.  dollar.  The types of transactions
covered by the special rules include the following:  (i) the  acquisition of, or
becoming the obligor under, a bond or other debt instrument  (including,  to the
extent provided in Treasury regulations,  preferred stock); (ii) the accruing of
certain  trade  receivables  and  payables;  and  (iii)  the  entering  into  or
acquisition  of any  forward  contract,  futures  contract,  option  or  similar
financial instrument if such instrument is not marked to market. The disposition
of a currency other than the U.S. dollar by a taxpayer whose functional currency
is the U.S.  dollar is also  treated as a  transaction  subject  to the  special
currency rules. However,  foreign  currency-related  regulated futures contracts
and nonequity options are generally not subject to the special currency rules if
they are or would be  treated as sold for their fair  market  value at  year-end
under the  marking-to-market  rules applicable to other futures contracts unless
an  election  is made  to have  such  currency  rules  apply.  With  respect  to
transactions  covered by the special  rules,  foreign  currency  gain or loss is
calculated separately from any gain or loss on the underlying transaction and is
normally  taxable as ordinary  income or loss.  A taxpayer may elect to treat as
capital  gain or  loss  foreign  currency  gain or  loss  arising  from  certain
identified  forward  contracts,  futures  contracts and options that are capital
assets in the hands of the  taxpayer  and which are not part of a straddle.  The
Treasury Department issued regulations under which certain  transactions subject
to  the  special  currency  rules  that  are  part  of a  "section  988  hedging
transaction" (as defined in the Internal  Revenue Code of 1986, as amended,  and
the Treasury regulations) will be integrated and treated as a single transaction
or otherwise  treated  consistently  for purposes of the Code.  Any gain or loss
attributable to the foreign currency component of a transaction  engaged in by a
fund which is not subject to the special  currency rules (such as foreign equity
investments other than certain preferred stocks) will be treated as capital gain
or loss  and  will not be  segregated  from  the gain or loss on the  underlying
transaction. It is anticipated that some of the non-U.S. dollar-denominated

                                       B-6

<PAGE>

investments and foreign currency  contracts the Fund may make or enter into will
be subject to the special currency rules described above.

  ILLIQUID  SECURITIES.  The  Fund may  invest  up to 15% of its net  assets  in
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 the Fund's books.

  The Fund may invest in restricted,  privately  placed  securities  that, under
securities  laws, may be sold only to qualified  institutional  buyers.  Because
these securities can be resold only to qualified  institutional  buyers or after
they  have been held for a number  of  years,  they may be  considered  illiquid
securities--meaning that they could be difficult for the Fund to convert to cash
if needed.

  If a substantial  market develops for a restricted  security held by the Fund,
it will be treated as a liquid  security,  in  accordance  with  procedures  and
guidelines  approved by the Fund's Board of Trustees.  This  generally  includes
securities  that are  unregistered  that can be sold to qualified  institutional
buyers in accordance  with Rule 144A under the  Securities Act of 1933 (the 1933
Act). While the Fund's investment adviser determines the liquidity of restricted
securities  on  a  daily  basis,   the  Board  oversees  and  retains   ultimate
responsibility  for the  adviser's  decisions.  Several  factors  that the Board
considers in monitoring these decisions include the valuation of a security, the
availability  of  qualified   institutional  buyers,  and  the  availability  of
information about the security's issuer.

  FOREIGN INVESTMENTS.  The Fund will invest in securities issued by foreign
governments, companies, and agencies.


  The Fund is, therefore, subject to country risk, which is the possibility that
political  events  (such  as a war),  financial  problems  (such  as  government
default),  or natural  disasters (such as an earthquake) will weaken a country's
economy and cause securities issued by entities in that country to lose money.

  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 foreign 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.

                       FUNDAMENTAL INVESTMENT LIMITATIONS

The Fund is subject to the following fundamental investment  limitations,  which
cannot be changed in any  material  way without the approval of the holders of a
majority of the Fund's shares.  For these  purposes,  a "majority" of the Fund's
shares  means shares  representing  the lesser of: (i) 67% or more of the Fund's
shares,  so long as shares  representing  more than 50% of the  Fund's net asset
value are present or represented  by proxy;  or (ii) more than 50% of the Fund's
outstanding shares.


  BORROWING.  The Fund may not borrow  money,  except for temporary or emergency
purposes in an amount not exceeding  15% of the Fund's net assets.  The Fund may
borrow  money  through  banks,  reverse  repurchase  agreements,  or  Vanguard's
interfund  lending program only, and must comply with all applicable  regulatory
conditions.  The  Fund  may not make any  additional  investments  whenever  its
outstanding borrowings exceed 5% of net assets.

  COMMODITIES. The Fund may not invest in commodities, except that it may invest
in bond and stock futures contracts,  bond and stock options and options on bond
and stock futures  contracts.  No more than 5% of the Fund's total assets may be
used as initial margin deposit for futures contracts,

                                       B-7

<PAGE>

and no more than 20% of the  Fund's  total  assets  my be  invested  in  futures
contracts or options at any time.

  DIVERSIFICATION.  With respect to 75% of its total  assets,  the Fund may not:
(i)  purchase  more than 10% of the  outstanding  voting  securities  of any one
issuer; or (ii) purchase  securities of any issuer if, as a result, more than 5%
of the Fund's total assets would be invested in that issuer's  securities.  This
limitation  does not apply to obligations of the United States  Government,  its
agencies, or instrumentalities.

  ILLIQUID SECURITIES.  The Fund may not acquire any security if, as a result,
more than 15% of its net assets would be invested in securities that are
illiquid.

  INDUSTRY CONCENTRATION.  The Fund may not invest more than 25% of its total
assets in any one industry.

  INVESTING FOR CONTROL.  The Fund may not invest in a company for purposes of
controlling its management.

  INVESTMENT COMPANIES. The Fund may not invest in any other investment company,
except  through a merger,  consolidation  or  acquisition  of assets,  or to the
extent  permitted  by Section  12 of the 1940 Act.  Investment  companies  whose
shares the Fund acquires pursuant to Section 12 must have investment  objectives
and investment policies consistent with those of the Fund.

  LOANS.  The  Fund  may not  lend  money to any  person  except  by  purchasing
fixed-income  securities or by entering into repurchase agreements,  lending its
portfolio securities, or through Vanguard's interfund lending program.

  MARGIN.  The Fund may not purchase securities on margin or sell securities
short, except as permitted by the Fund's investment policies relating to
commodities.

  OIL, GAS, MINERALS.  The Fund may not invest in interests in oil, gas, or
other mineral exploration or development programs.

  PLEDGING ASSETS.  The Fund may not pledge, mortgage, or hypothecate more than
15% of its net assets.

  REAL ESTATE. The Fund may not invest directly in real estate,  although it may
invest in securities of companies  that deal in real estate and bonds secured by
real estate.

  RELATED PARTY  TRANSACTIONS.  The Trust may not have dealings on behalf of the
Trust with officers and Trustees,  except for the purchase or sale of securities
on an agency or commission  basis. The Trust may not make loans to any officers,
Trustees, or employees of the Trust.

  SENIOR SECURITIES.  The Fund may not issue senior securities, except in
compliance with the 1940 Act.

  UNDERWRITING.  The Fund may not engage in the business of underwriting
securities issued by other persons. The Fund will not be considered an
underwriter when disposing of its investment securities.

  None of these limitations prevents the Fund from participating in The Vanguard
Group  (Vanguard).  As a member of the Group, the Fund may own securities issued
by Vanguard, make loans to Vanguard, and contribute to Vanguard's costs or other
financial requirement. See "Management of the Fund" for more information.

  Compliance with the investment  limitations set forth above is measured at the
time the  investment  is made, a later  change in  percentage  resulting  from a
change in the market  value of assets will not  constitute  a violation  of such
restriction.

                             YIELD AND TOTAL RETURN
Yields  are  calculated   daily  and  premiums  and  discounts  on  asset-backed
securities are not amortized.

                                       B-8

<PAGE>


     The yield of the Fund's Investor Shares for the 30 days ended June 30, 2000
was .%. The average  annual total return of the Fund's  Investor  Shares for the
one and five  years  ended  December  31,  1999 and since  November  9, 1992 was
13.61%, 19.13%, and 14.89%,  respectively.  Performance figures are not adjusted
for the $10 annual account maintenance fee.


AVERAGE ANNUAL TOTAL RETURN

Average annual total return is the average annual  compounded rate of return for
the periods of one year,  five years,  ten years,  or the life of the Fund,  all
ended on the last day of a recent month.  Average annual total return quotations
will  reflect  changes  in the price of the Fund's  shares  and assume  that all
dividends and capital gains  distributions  during the  respective  periods were
reinvested in Fund shares.

  Average  annual  total  return is  calculated  by finding the  average  annual
compounded  rates of  return of a  hypothetical  investment  over  such  periods
according  to the  following  formula  (average  annual  total  return  is  then
expressed as a percentage):

                            T  =  (ERV/P) /1/N /- 1
  Where:

          T    = average annual total return.
          P    = a hypothetical initial investment of $1,000.
          n    = number of years.
          ERV  = ending  redeemable  value:  ERV is the value, at the end of the
               applicable  period,  of a hypothetical  $1,000 investment made at
               the beginning of the applicable period.

AVERAGE ANNUAL AFTER-TAX TOTAL RETURN QUOTATION

We calculate the Fund's  average  annual  after-tax  total return by finding the
average annual  compounded  rate of return over the 1-, 5-, and 10-year  periods
(or for periods of the Fund's  operations)  that would equate the initial amount
invested to the after-tax value, according to the following formulas:

After-tax return:

                                P (1+T) /N/ = ATV
  Where:

          P   = a  hypothetical  initial  payment  of  $1,000
          T   =  average  annual after-tax  return
          n   = number of years
          ATV = after-tax value at the end of the 1-, 5-, or 10-year periods of
              a hypothetical $1,000 payment made at the beginning of the time
              period, assuming no liquidation of the investment at the end of
              the measurement periods.

Instructions.
1.Assume all  distributions  by the Fund are  reinvested--less  the taxes due on
  such  distributions--at the price on the reinvestment dates during the period.
  Adjustments may be made for subsequent re-characterizations of distributions.

2.Calculate the taxes due on  distributions  by the Fund by applying the highest
  federal  marginal  tax rates to each  component  of the  distributions  on the
  reinvestment date (e.g.,  ordinary income,  short-term capital gain, long-term
  capital gain, etc.). For periods after December 31, 1997, the federal marginal
  tax  rates  used for the  calculations  are  39.6%  for  ordinary  income  and
  short-term  capital gains and 20% for long-term  capital gains.  Note that the
  applicable tax rates may vary over the measurement period. Assume no taxes are
  due on the portions of any

                                       B-9

<PAGE>

  distributions classified as exempt interest or non-taxable (i.e., return of
  capital). Ignore any potential tax liabilities other than federal tax
  liabilities (e.g., state and local taxes).

3.Include all recurring fees that are charged to all shareholder  accounts.  For
  any  account  fees that vary with the size of the  account,  assume an account
  size  equal to the  Fund's  mean (or  median)  account  size.  Assume  that no
  additional  taxes or tax credits result from any redemption of shares required
  to pay such fees.

4. State the total return quotation to the nearest hundredth of one percent.


CUMULATIVE TOTAL RETURN

Cumulative  total  return is the  cumulative  rate of  return on a  hypothetical
initial  investment of $1,000 for a specified  period.  Cumulative  total return
quotations reflect changes in the price of the Fund's shares and assume that all
dividends and capital gains  distributions  during the period were reinvested in
Fund shares.  Cumulative  total return is calculated  by finding the  cumulative
rates of a return of a hypothetical  investment over such periods,  according to
the  following  formula   (cumulative  total  return  is  then  expressed  as  a
percentage):

                               C  =  (ERV/P) - 1
  Where:

          C   = cumulative total return.
          P   = a hypothetical initial investment of $1,000.
          ERV = ending redeemable value: ERV is the value, at the end
               of the applicable period, of a hypothetical $1,000
               investment made at the beginning of the applicable
               period.

SEC YIELDS

Yield is the net  annualized  yield based on a  specified  30-day (or one month)
period  assuming  semiannual  compounding  of  income.  Yield is  calculated  by
dividing the net  investment  income per share  earned  during the period by the
maximum offering price per share on the last day of the period, according to the
following formula:

                        YIELD  =  2[((A-B)/CD+1) /6/- 1]
  Where:

          a = dividends and interest earned during the period.
          b = expenses accrued for the period (net of reimbursements).
          c = the  average  daily  number of shares  outstanding  during  the
              period that were entitled to receive dividends.
          d = the maximum offering price per share on the last day of the
              period.

                               PURCHASE OF SHARES
The Fund reserves the right in its sole  discretion (i) to suspend the offerings
of its shares, (ii) to reject 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  investment for or any other  restrictions on initial and subsequent
investments as well as redemption fees for certain  fiduciary  accounts or under
circumstances  where  certain  economies  can be achieved in sales of the Fund's
shares.

  The Fund  reserves  the  right to  deduct a  transaction  fee of .08%  from an
investor's   cumulative   purchases  over  $100  million.  The  Fund  may  incur
substantial  transaction  costs in  absorbing  very large  investments,  and the
fee--paid  directly to the Fund--is  intended to protect  existing  shareholders
from being  unfairly  impacted by such costs.  The Fund's  adviser will consider
several  factors  in  determining  whether  to  apply  the  fee,  including  the
following:

                                      B-10

<PAGE>

. The  transaction  costs  of  buying  securities,  determined  in  part  by the
  availability of securities at that time.

. The offsetting effect of any Fund redemptions occurring at that time.

. The Fund's then current rate of growth.

. Whether  the  Fund's  corporate   substitution   strategy   provides  adequate
  additional  returns to help offset transaction costs associated with the large
  investment  under  then  current  market   conditions  (as  discussed  in  the
  prospectus).

TRADING SHARES THROUGH CHARLES SCHWAB
The Fund has  authorized  Charles  Schwab & Co., Inc.  (Schwab) to accept on its
behalf purchase and redemption orders under certain terms and conditions. Schwab
is also  authorized to designate  other  intermediaries  to accept  purchase and
redemption  orders on the Fund's behalf  subject to those terms and  conditions.
Under this  arrangement,  the Fund will be deemed to have received a purchase or
redemption order when Schwab or, if applicable,  Schwab's  authorized  designee,
accepts the order in accordance  with the Fund's  instructions.  Customer orders
that are properly transmitted to the Fund by Schwab, or if applicable,  Schwab's
authorized designee, will be priced as follows:

  Orders received by Schwab before 3 p.m. Eastern time on any business day, will
be sent to  Vanguard  that day and your share  price will be based on the Fund's
net asset value  calculated at the close of trading that day. Orders received by
Schwab  after 3 p.m.  Eastern  time,  will be sent to Vanguard on the  following
business  day and your share  price will be based on the Fund's net asset  value
calculated at the close of trading that day.

                                   SHARE PRICE

The Fund's  share  price,  or "net asset  value" per  share,  is  calculated  by
dividing the net assets attributable to each share class, by the total number of
shares  outstanding for that class.  The net asset value is 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  for  which  market  quotations  are  readily  available
(including those securities listed on national securities exchanges,  as well as
those quoted on the NASDAQ Stock Market) will be valued at the last quoted sales
price on the day the valuation is made. Such securities  which are not traded on
the  valuation  date are  valued  at the mean of the bid and ask  prices.  Price
information on  exchange-listed  securities is taken from the exchange where the
security is primarily  traded.  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.

  Short term instruments (those acquired with remaining maturities of 60 days or
less) may be valued at cost,  plus or minus any  amortized  discount or premium,
which approximates market value.

  Bonds and other  fixed-income  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. 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  transactions in similar groups of securities as
well as any developments related to specific securities.

  Other assets and securities  for which no quotations are readily  available or
which are  restricted  as to sale (or resale) are valued by such  methods as the
Board of Trustees deems in good faith to reflect fair value.

  The share price for the Fund can be found daily in the mutual fund listings of
most major newspapers under the heading of Vanguard Index Funds.

                                      B-11

<PAGE>

                              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  Commission,  (ii) during any period
when an emergency exists as defined by 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.

  No charge is made by the Fund for  redemptions.  Shares  redeemed may be worth
more or less than what was paid for them,  depending on the market value of
the securities held by the Fund.

                             MANAGEMENT OF THE FUND
OFFICERS AND TRUSTEES

The officers of the Fund manage its day-to-day operations and are responsible to
the Fund's Board of Trustees.  The Trustees set broad  policies for the Fund and
choose its officers. The following is a list of the Trustees and officers of the
Fund and a statement of their present positions and principal occupations during
the past five years. As a group,  the Fund's Trustees and officers own less than
1% of the outstanding shares of the Fund. Each Trustee also serves as a Director
of The  Vanguard  Group,  Inc.,  and as a  Trustee  of  each  of the  103  funds
administered  by Vanguard (102 in the case of Mr.  Malkiel and 93 in the case of
Mr.  MacLaury).  The mailing address of the Trustees and officers of the Fund is
Post Office Box 876, Valley Forge, PA 19482.

JOHN J. BRENNAN,(DOB: 7/29/1954) Chairman, Chief Executive Officer, and Trustee*
Chairman, Chief Executive Officer, and Director of The Vanguard Group, Inc., and
Trustee of each of the investment companies in The Vanguard Group.

JOANN HEFFERNAN HEISEN, (DOB: 1/25/1950) Trustee Vice President, Chief
Information Officer, and member of the Executive Committee of Johnson and
Johnson (Pharmaceuticals/Consumer Products); Director of Johnson & Johnson*MERCK
Consumer Pharmaceuticals Co., The Medical Center at Princeton, and Women's
Research and Education Institute.

BRUCE K. MACLAURY, (DOB: 5/7/1931) Trustee President Emeritus of The Brookings
Institution (Independent Non-Partisan Research Organization); Director of
American Express Bank, Ltd., The St. Paul Companies, Inc. (Insurance and
Financial Services), and National Steel Corp.

BURTON G. MALKIEL, (DOB: 8/28/1932) Trustee Chemical Bank Chairman's Professor
of Economics, Princeton University; Director of Prudential Insurance Co. of
America, Banco Bilbao Gestinova, Baker Fentress & Co. (Investment Management),
The Jeffrey Co. (Holding Company), and Select Sector SPDR Trust (Exchange-Traded
Mutual Fund).

ALFRED M. RANKIN, JR., (DOB: 10/8/1941) Trustee Chairman, President, Chief
Executive Officer, and Director of NACCO Industries, Inc. (Machinery/
Coal/Appliances); Director of The BFGoodrich Co. (Aircraft
Systems/Manufacturing/Chemicals), and The Standard Products Co. (Rubber Products
Company).



JAMES O. WELCH, JR., (DOB: 5/13/1931) Trustee Retired Chairman of Nabisco
Brands, Inc. (Food Products); retired Vice Chairman and Director of RJR Nabisco
(Food and Tobacco Products); Director of TECO Energy, Inc., and Kmart Corp.

                                      B-12

<PAGE>

J. LAWRENCE WILSON, (DOB: 3/2/1936) Trustee Retired Chairman of Rohm & Haas Co.
(Chemicals); Director of Cummins Engine Co. (Diesel Engine Company), The Mead
Corp. (Paper Products); and AmeriSource Health Corp.; and Trustee of Vanderbilt
University.

RAYMOND J. KLAPINSKY, (DOB: 12/7/1938) Secretary* Managing Director of The
Vanguard Group, Inc.; Secretary of The Vanguard Group, Inc. and of each of the
investment companies in The Vanguard Group.

THOMAS J. HIGGINS, (DOB: 5/21/1957) Treasurer* Principal of The Vanguard Group,
Inc.; Treasurer of each of the investment companies in The Vanguard Group.

ROBERT D. SNOWDEN, (DOB: 9/4/1961) Controller* Principal 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 1940 Act.

THE VANGUARD GROUP
The  Fund is a  member  of the  Vanguard  Group of  Investment  Companies  which
consists of more than 100 funds.  Through their  jointly-owned  subsidiary,  The
Vanguard Group, Inc. (Vanguard),  the Trust and the other Trusts in The Vanguard
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.

  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 each fund. In addition, each fund bears its own
direct expenses such as legal, auditing and custodian fees.

  The funds' 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.

  Vanguard  and the  Fund has  adopted  a Code of  Ethics  designed  to  prevent
employees  who may have  access  to  nonpublic  information  about  the  trading
activities of the Fund (access persons) from profiting from that information.

 The Code permits access persons to invest in securities for their own accounts,
including  securities  that may be held by the Fund, but places  substantive and
procedural  restrictions  on their  trading  activities.  For example,  the Code
requires  that access  persons of the Fund  receive  advance  approval for every
securities trade to ensure that there is no conflict with the trading activities
of the Fund.

  Vanguard was established  and operates under a Funds' Service  Agreement which
was approved by the shareholders of each of the funds. The amounts which each of
the funds has 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.  The Amended and Restated  Funds'  Service
Agreement provides for the following arrangement:  (1) each Vanguard fund may be
called upon to invest a maximum of 0.40% of its assets in Vanguard and (2) there
is no  restriction  on the maximum cash  investment  that the Vanguard funds may
make in Vanguard.  At December 31, 1999, the Balanced Index Fund had contributed
capital of $595,000 to Vanguard, representing 0.02% of the Fund's net assets and
0.60% of 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.

                                      B-13

<PAGE>

  DISTRIBUTION. Vanguard Marketing Corporation, a wholly-owned subsidiary of The
Vanguard Group, Inc., provides all distribution and marketing activities for the
funds in the Group.  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 Vanguard. The Trustees 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 funds aggregate  quarterly rate of contribution for
distribution expenses of a marketing and promotional nature shall exceed 125% of
average  distribution  expense rate for  Vanguard,  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  years ended  December 31, 1997,  1998,  and 1999,  the Fund
incurred the following  approximate  amounts of The Vanguard Group's  management
(including  transfer agency)  distribution,  and marketing  expenses:  $974,000,
$1,715,000, and $4,542,000, respectively.

INVESTMENT ADVISORY SERVICES

Vanguard provides  investment  advisory services to the Fund. 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 and funds utilizing these services. During the fiscal years ended December
31, 1997, 1998, and 1999, the Fund paid  approximately  $80,000,  $123,000,  and
$205,000,  respectively,  of Vanguard's expenses relating to investment advisory
services.

TRUSTEE COMPENSATION

The  same  individuals  serve  as  Trustees  of all  Vanguard  funds  (with  two
exceptions,  which are noted in the table appearing on page B-15), and each fund
pays a proportionate share of the Trustees' compensation. The funds employ their
officers on a shared  basis,  as well.  However,  officers  are  compensated  by
Vanguard, not the funds.

  INDEPENDENT TRUSTEES.  The funds compensate their independent Trustees--that
is, the ones who are not also officers of the Fund--in three ways:

. The independent Trustees receive an annual fee for their service to the funds,
  which is subject to reduction based on absences from scheduled Board meetings.

. The independent Trustees are reimbursed for the travel and other expenses that
  they incur in attending Board meetings.

. Upon retirement,  the independent  Trustees receive an aggregate annual fee of
  $1,000 for each year served on the Board, up to fifteen years of service. This
  annual fee is paid for ten years following retirement, or until each Trustee's
  death.

  "INTERESTED" TRUSTEE.  Mr. Brennan serves as a Trustee, but is not paid in
this capacity. He is, however, paid in his role as officer of The Vanguard
Group, Inc.


  COMPENSATION TABLE. The following table provides compensation details for each
of the  Trustees.  We list the  amounts  paid as  compensation  and  accrued  as
retirement benefits by the Fund for each Trustee.  In addition,  the table shows
the total  amount of benefits  that we expect each  Trustee to receive  from all
Vanguard funds upon  retirement,  and the total amount of  compensation  paid to
each Trustee by all Vanguard funds.

                                      B-14

<PAGE>

                                 VANGUARD BALANCED INDEX FUNDS
                                 TRUSTEES' COMPENSATION TABLE

<TABLE>
<CAPTION>
<S>                                           <C>            <C>              <C>             <C>
                                                              PENSION OR
                                                              RETIREMENT                            TOTAL
                                                               BENEFITS                         COMPENSATION
                                                AGGREGATE      ACCRUED AS       ESTIMATED          FROM ALL
                                              COMPENSATION   PART OF THESE       ANNUAL            VANGUARD
                                               FROM THESE        FUNDS'       BENEFITS UPON    FUNDS PAID TO
 NAMES OF TRUSTEES                               FUNDS(1)      EXPENSES(1)      RETIREMENT       TRUSTEES(2)
---------------------------------------------------------------------------------------------------------------
John C. Bogle(3)                                    None          None             None              None
John J. Brennan                                     None          None             None              None
JoAnn Heffernan Heisen                              $439          $24           $15,000           $80,000
Bruce K. MacLaury                                   $457          $42           $12,000           $75,000
Burton G. Malkiel                                   $443          $40           $15,000           $80,000
Alfred M. Rankin, Jr.                               $439          $29           $15,000           $80,000
John C. Sawhill(4)                                  $439          $37           $15,000           $80,000
James O. Welch, Jr.                                 $439          $43           $15,000           $80,000
J. Lawrence Wilson                                  $439          $31           $15,000           $80,000
</TABLE>

(1)  The amounts  shown in this column are based on the Funds' fiscal year ended
     January 31, 2000.
(2)  The amounts reported in this column reflect the total  compensation paid to
     each Trustee for his or her service as Trustee of 103  Vanguard  funds (102
     in the  case  of Mr.  Malkiel;  93 in the  case  of Mr.  MacLaury)  for the
     1999 calendar year.
(3)  Mr. Bogle has retired from the Funds' Board, effective December 31, 1999.

(4)  Mr. Sawhill passed away on May 18, 2000.



                             PORTFOLIO TRANSACTIONS
In placing portfolio transactions, Vanguard uses its best judgment to choose the
broker most capable of providing the brokerage  services necessary to obtain the
best available price and most favorable execution. The full range and quality of
brokerage services available are 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 will be given to those brokers which supply
statistical  information  and provide  other  services in addition to  execution
services to the Fund.

  The Fund's bond investments are generally purchased and sold through principal
transactions,  meaning that the Fund normally  purchases bonds directly from the
issuer or a primary  market-maker  acting  as  principal  for the bonds on a net
basis.  Explicit  brokerage  commissions  are not  paid on  these  transactions,
although  the  purchase   price  for  bonds  usually   includes  an  undisclosed
compensation.   Purchases  from   underwriters  of  bonds  typically  include  a
commission or concession  paid by the issuer to the  underwriter,  and purchases
from  dealers  serving as market  makers  typically  include a dealer's  mark-up
(i.e., a spread between the bid and the asked prices).

  The Vanguard Group chooses  brokers or dealers to handle the purchase and sale
of the Fund's bonds, and is responsible for getting the best available price and
most favorable  execution for all transactions.  When the Fund purchases a newly
issued bond at a fixed price,  Vanguard  may  designate  certain  members of the
underwriting syndicate to receive compensation associated with that transaction.
Certain dealers have agreed to rebate a portion of such compensation directly to
the Fund to offset its  management  expenses.  Vanguard is required to seek best
execution of all  transactions  and is not authorized to pay a higher  brokerage
commission solely on account of the receipt of research or other services.

                                      B-15

<PAGE>

  The Fund's adviser  evaluates the  reasonableness  of any commissions  paid by
considering:   (a)   historical   commission   rates;   (b)  rates  which  other
institutional  investors are paying, based upon publicly available  information;
(c)  rates  quoted  by  brokers  and  dealers;  (d)  the  size  of a  particular
transaction,  in terms of the number of  shares,  dollar  amount,  and number of
clients  involved;  (e) the  complexity of a particular  transaction in terms of
both  execution and  settlement;  (f) the level and type of business done with a
particular firm over a period of time; and (g) the extent to which the broker or
dealer has  capital at risk in the  transaction.  During the fiscal  years ended
December  31,  1997,  1998,  and  1999,  the Fund  paid  approximately  $70,745,
$139,894, and $141,882 in brokerage commissions, respectively.

                              FINANCIAL STATEMENTS
The Fund's financial  statements as of and for the year ended December 31, 1999,
appearing  in  the  Vanguard   Balanced  Index  Fund's  1999  Annual  Report  to
Shareholders,  and the report thereon of PricewaterhouseCoopers LLP, independent
accountants,  also  appearing  therein,  are  incorporated  by reference in this
Statement of  Additional  Information.  For a more  complete  discussion  of the
performance,  please see the Fund's Annual Report to Shareholders,  which may be
obtained without charge.

                               COMPARATIVE INDEXES
Each of the investment company members of The Vanguard Group, including Vanguard
Balanced  Index Fund,  may from time to time,  use one or more of the  following
unmanaged indexes for comparative performance purposes.

STANDARD & POOR'S 500 COMPOSITE STOCK PRICE  INDEX--includes  stocks selected by
Standard & Poor's  Index  Committee  to  include  leading  companies  in leading
industries and to reflect the U.S. stock market.

STANDARD & POOR'S  MIDCAP 400  INDEX--is  composed of 400 medium sized  domestic
stocks.

STANDARD & POOR'S 500/BARRA VALUE  INDEX--consists of the stocks in the Standard
& Poor's 500 Composite Stock Price Index (S&P 500) with the lowest price-to-book
ratios, comprising 50% of the market capitalization of the S&P 500.

STANDARD & POOR'S  SMALLCAP  600/BARRA VALUE  INDEX--contains  stocks of the S&P
SmallCap 600 Index which have a lower than average price-to-book ratio.

STANDARD & POOR'S SMALLCAP  600/BARRA GROWTH  INDEX--contains  stocks of the S&P
SmallCap 600 Index which have a higher than average price-to-book ratio.

RUSSELL  1000  VALUE  INDEX--consists  of the stocks in the  Russell  1000 Index
(comprising  the 1,000  largest  U.S.-based  companies  measured by total market
capitalization)  with the lowest  price-to-book  ratios,  comprising  50% of the
market capitalization of the Russell 1000.

WILSHIRE  5000 TOTAL MARKET  INDEX--consists  of more than 7,000  common  equity
securities,  covering  all  stocks  in the  U.S.  for  which  daily  pricing  is
available.

WILSHIRE  4500  COMPLETION  INDEX--consists  of all stocks in the Wilshire  5000
except for the 500 stocks in the Standard and Poor's 500 Index.

RUSSELL 3000 STOCK INDEX--a diversified  portfolio of approximately 3,000 common
stocks  accounting for over 90% of the market value of publicly traded stocks in
the U.S.

RUSSELL 2000 STOCK INDEX--a subset of approximately 2,000 of the smallest stocks
contained in the Russell 3000, a widely-used  benchmark for small capitalization
common stocks.

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, Australasia, and the Far East.

                                      B-16

<PAGE>

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 BROTHERS  LONG-TERM  TREASURY BOND INDEX--is a market weighted index that
contains individually priced U.S. Treasury securities.

MERRILL LYNCH  CORPORATE & GOVERNMENT  BOND  INDEX--consists  of over 4,500 U.S.
Treasury, agency and investment grade corporate bonds.

LEHMAN BROTHERS  CORPORATE (BAA) BOND INDEX--all  publicly  offered  fixed-rate,
nonconvertible  domestic  corporate bonds rated Baa by Moody's,  with a maturity
longer  than one year and with more than $100  million  outstanding.  This index
includes over 1,500 issues.

LEHMAN  BROTHERS  LONG-TERM  CORPORATE  BOND  INDEX--is  a subset of the  Lehman
Brothers   Corporate  Bond  Index  covering  all  corporate,   publicly  issued,
fixed-rate,  nonconvertible  U.S.  debt issues rated at least Baa, with at least
$100 million principal outstanding and maturity greater than ten years.

BOND BUYER  MUNICIPAL BOND INDEX--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
for four high-grade, non-callable 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  Brothers
Long-Term Corporate AA or Better Bond Index.

COMPOSITE INDEX--65% Lehman Brothers Long-Term Corporate AA or Better Bond Index
and a 35% weighting in a blended  equity  composite (75% Standard & Poor's/BARRA
Value Index, 12.5% Standard & Poor's Utilities Index and 12.5% Standard & Poor's
Telephone Index).

LEHMAN BROTHERS  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.

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 Baa- or better. The Index has a market value of over
$5 trillion.

LEHMAN  BROTHERS  CORPORATE A OR BETTER  BOND  INDEX--consists  of all  publicly
issued,  investment  grade  corporate  bonds rated A or better,  of all maturity
levels.

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 one and five years. The index has a market value of over $1.6 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 five and
ten years. The index has a market value of over $800 billion.

                                      B-17

<PAGE>

LEHMAN  BROTHERS  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 ten years. The index
has a market value of over $1.1 trillion.

LIPPER SMALL  COMPANY  GROWTH FUND  AVERAGE--the  average  performance  of small
company  growth funds as defined by Lipper 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 BALANCED FUND  AVERAGE--an  industry  benchmark of average balanced funds
with similar investment objectives and policies, as measured by Lipper 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 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 Inc.

LIPPER GENERAL EQUITY FUND  AVERAGE--an  industry  benchmark of average  general
equity funds with similar  investment  objectives  and policies,  as measured by
Lipper Inc.

LIPPER FIXED-INCOME FUND AVERAGE--an  industry benchmark of average fixed-income
funds with similar  investment  objectives  and policies,  as measured by Lipper
Inc.

                                      B-18

<PAGE>

                    APPENDIX A--DESCRIPTION OF BOND RATINGS

Excerpts from Moody's Investors Service, Inc. description of its four highest
preferred bond ratings:

  AAA--Judged  to be the  best  quality.  They  carry  the  smallest  degree  of
investment risk.

  AA--Judged to be of high 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.

  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 they are somewhat more  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.

                                      B-19

<PAGE>

                                                           SAI002-BALANCED INDEX

                                      B-20

<PAGE>

                                     PART C

                          VANGUARD BALANCED INDEX FUND

                                OTHER INFORMATION

ITEM 23. EXHIBITS


(a)    Declaration of Trust**
(b)    By-Laws**
(c)    Not applicable
(d)    Investment Advisory Contract**
(e)    Not applicable
(f)    Reference is made to the section entitled "Management of the Fund" in the
       Registrant's Statement of Additional Information
(g)    Custodian Agreement**
(h)    Amended and Restated Funds' Service Agreement**
(i)    Legal Opinion**
(j)    Consent of Independent Accountants***
(k)    Not Applicable
(l)    Not Applicable
(m)    Not Applicable
(n)    Not Applicable
(o)    Rule 18f-3 Plan*

(p)    Code of Ethics**

       *Filed herewith
      **Filed previously


     ***To be filed by amendment



ITEM 24. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT

Registrant is not controlled by or under common control with any person.

ITEM 25. INDEMNIFICATION

The  Registrant's   organizational  documents  contain  provisions  indemnifying
Trustees and officers  against  liability  incurred in their official  capacity.
Article VII,  Section 2 of the Declaration of Trust provides that the Registrant
may  indemnify  and hold  harmless  each and every  Trustee and officer from and
against  any and all  claims,  demands,  costs,  losses,  expenses,  and damages
whatsoever  arising out of or related to the performance of his or her duties as
a Trustee or officer.  However,  this  provision does not cover any liability to
which a Trustee  or  officer  would  otherwise  be  subject by reason of willful
misfeasance,  bad faith,  gross negligence,  or reckless disregard of the duties
involved  in  the  conduct  of  his or her  office.  Article  VI of the  By-Laws
generally provides that the Registrant shall indemnify its Trustees and officers
from  any  liability  arising  out of  their  past or  present  service  in that
capacity.  Among other things,  this provision excludes any liability arising by
reason of willful  misfeasance,  bad faith,  gross  negligence,  or the reckless
disregard  of the duties  involved in the conduct of the  Trustee's or officer's
office with the Registrant.

ITEM 26. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER

Investment  advisory services are provided to the Registrant on an at-cost basis
by The Vanguard Group,  Inc., a  jointly-owned  subsidiary of the Registrant and
the other Trusts in the Group. See the information concerning The Vanguard Group
set forth in Parts A and B.

                                       C-1

<PAGE>

ITEM 27. PRINCIPAL UNDERWRITERS

(a)    Not Applicable
(b)    Not Applicable
(c)    Not Applicable

ITEM 28. LOCATION OF ACCOUNTS AND RECORDS

The books, accounts, and other documents required to be maintained by Section 31
(a) of the Investment  Company Act and the rules promulgated  thereunder will be
maintained  at the  offices of  Registrant;  Registrant's  Transfer  Agent,  The
Vanguard Group, Inc., 100 Vanguard Boulevard  Malvern,  Pennsylvania  19355; and
the   Registrant's   Custodian,   First  Union  National   Bank,   Philadelphia,
Pennsylvania 19106.

ITEM 29. MANAGEMENT SERVICES

Other than as set forth under the description of The Vanguard Group in Part B of
this   Registration   Statement,   the   Registrant   is  not  a  party  to  any
management-related service contract.

ITEM 30. UNDERTAKINGS

Not Applicable

                                       C-2

<PAGE>

                                   SIGNATURES


Pursuant to the  requirements  of the  Securities Act of 1933 and the Investment
Company Act of 1940,  the  Registrant  hereby  certifies that it has duly caused
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 26th day of July, 2000.


                                                 VANGUARD BALANCED INDEX FUND

                                            BY:_________________________________
                                                          (signature)
                                                         (HEIDI STAM)
                                                       JOHN J. BRENNAN*
                                            CHAIRMAN AND CHIEF EXECUTIVE OFFICER


  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:


SIGNATURE                     TITLE                           DATE
--------------------------------------------------------------------------------

By:/S/ JOHN J. BRENNAN        President, Chairman, Chief      July 26, 2000
   -------------------------  Executive Officer, and Trustee
       (Heidi Stam)
      John J. Brennan*


By:/S/ JOANN HEFFERNAN HEISEN Trustee                         July 26, 2000
   ---------------------------
       (Heidi Stam)
     JoAnn Heffernan Heisen*


By:/S/ BRUCE K. MACLAURY      Trustee                         July 26, 2000
   ---------------------------
       (Heidi Stam)
      Bruce K. MacLaury*


By:/S/ BURTON G. MALKIEL      Trustee                         July 26, 2000
   ---------------------------
       (Heidi Stam)
       Burton G. Malkiel*


By:/S/ ALFRED M. RANKIN, JR.  Trustee                         July 26, 2000
   ---------------------------
       (Heidi Stam)
     Alfred M. Rankin, Jr.*


By:/S/ JAMES O. WELCH, JR.    Trustee                         July 26, 2000
   ---------------------------
       (Heidi Stam)
     James O. Welch, Jr.*

By:/S/ J. LAWRENCE WILSON     Trustee                         July 26, 2000
   ---------------------------
       (Heidi Stam)
     J. Lawrence Wilson*


By:/S/ THOMAS J. HIGGINS      Treasurer and Principal         July 26, 2000
   -------------------------- Financial Officer and
       (Heidi Stam)           Principal Accounting Officer
      Thomas J. Higgins*


*By Power of Attorney. See File Number 33-4424, filed on January 25, 1999.
  Incorporated by Reference.








<PAGE>

                                  EXHIBIT INDEX


Rule 18f-3 Plan . . . . . . . . . . . . . . . . . . . . . . . . .  . .  EX-99.BO



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