GLENBROOK LIFE & ANNUITY CO SEPARATE ACCOUNT A
497, 1996-10-25
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<PAGE>
             GLENBROOK LIFE AND ANNUITY COMPANY SEPARATE ACCOUNT A
                                   OFFERED BY
                       GLENBROOK LIFE AND ANNUITY COMPANY
                             POST OFFICE BOX 94039
                         PALATINE, ILLINOIS 60094-4039
                                1-(800)776-6978
PROSPECTUS
            INDIVIDUAL AND GROUP FLEXIBLE PREMIUM DEFERRED VARIABLE
MAY 1, 1996
                               ANNUITY CONTRACTS
(AS SUPPLEMENTED AUGUST 30, 1996)
                            ------------------------
 
    This  prospectus  describes the  AIM Lifetime  Plus-SM- Variable  Annuity, a
Flexible Premium Deferred Variable Annuity Contract ("Contract") designed to aid
you in  long-term  financial planning  and  which  can be  used  for  retirement
planning.  The  Contracts  are  issued by  Glenbrook  Life  and  Annuity Company
("Company"), a  wholly  owned subsidiary  of  Allstate Life  Insurance  Company.
Purchase  payments for the Contracts  will be allocated to  a series of Variable
Sub-accounts of  the  Glenbrook Life  and  Annuity Company  Separate  Account  A
("Variable  Account") and/or  to a  Fixed Account  option(s) funded  through the
Company's general account.
 
    The Contracts are issued as individual  Contracts or as group Contracts.  In
states  where the Contracts are available only as group Contracts, a certificate
is issued that summarizes the provisions of the group Contract. For convenience,
this prospectus refers to both Contracts and certificates as "Contracts."
 
    The Variable Sub-accounts invest in shares of AIM Variable Insurance  Funds,
Inc.  (the "Fund  Series"). Nine  Funds are  currently available  for investment
within the Variable  Account: (1) AIM  V.I. Capital Appreciation  Fund; (2)  AIM
V.I.  Diversified Income Fund; (3) AIM V.I.  Global Utilities Fund; (4) AIM V.I.
Government Securities Fund; (5)  AIM V.I. Growth Fund;  (6) AIM V.I. Growth  and
Income  Fund; (7) AIM V.I. International Equity  Fund; (8) AIM V.I. Money Market
Fund; and (9) AIM V.I. Value Fund.
 
    This prospectus  presents  information  you  should  know  before  making  a
decision to invest in the Contract and the available Investment Alternatives.
 
    The  Contract  Value  will  vary  daily  as  a  function  of  the investment
performance of  the  Sub-accounts  of  our Variable  Account  and  any  interest
credited  to  the Fixed  Account.  The Company  does  not guarantee  any minimum
Contract Value for amounts allocated to the Variable Account. Benefits  provided
by this Contract, when based on the Fixed Account, are subject to a Market Value
Adjustment,  the operation of which may result in upward or downward adjustments
in withdrawal benefits,  death benefits, settlement  values, transfers to  other
Sub-accounts, or periodic income payments.
 
    THE   CONTRACTS  MAY  BE  DISTRIBUTED   THROUGH  BROKER-DEALERS  WHICH  HAVE
RELATIONSHIPS WITH BANKS OR OTHER FINANCIAL INSTITUTIONS OR BY EMPLOYEES OF SUCH
BANKS; HOWEVER, THE CONTRACTS AND THE INVESTMENTS IN THE FUNDS ARE NOT DEPOSITS,
OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED BY ANY BANK, AND THE FUNDS'  SHARES
ARE  NOT FEDERALLY  INSURED OR  GUARANTEED BY  THE U.S.  GOVERNMENT, THE FEDERAL
DEPOSIT INSURANCE CORPORATION, THE  FEDERAL RESERVE BOARD  OR ANY OTHER  AGENCY.
INVESTMENT  IN THE CONTRACTS  INVOLVES INVESTMENT RISKS,  INCLUDING THE POSSIBLE
LOSS OF PRINCIPAL.
 
    The Company has  prepared and  filed a Statement  of Additional  Information
dated  May 1, 1996 with the U.S. Securities and Exchange Commission. If you wish
to receive the Statement of Additional  Information, you may obtain a free  copy
by calling or writing the Company at the address above. For your convenience, an
order  form for the Statement of Additional Information may be found on page B-2
of this  prospectus.  Before ordering,  you  may wish  to  review the  Table  of
Contents  of  the  Statement  of  Additional Information  on  page  B-1  of this
prospectus. The Statement  of Additional  Information has  been incorporated  by
reference into this prospectus.
 
    THIS  PROSPECTUS IS  VALID ONLY  WHEN ACCOMPANIED  OR PRECEDED  BY A CURRENT
PROSPECTUS FOR AIM VARIABLE INSURANCE FUNDS, INC.
 
    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION, NOR HAS THE COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
    PLEASE READ THIS PROSPECTUS CAREFULLY AND RETAIN IT FOR FUTURE REFERENCE
 
                  The Contract is not available in all states.
 
    At least once each Contract year, the Company will send the Owner an  annual
statement  that contains certain information pertinent to the individual Owner's
Contract. The annual statement  details values and  specific Contract data  that
applies  to  each particular  Contract. The  annual  statement does  not contain
financial statements of the Company, although the Company's Financial Statements
are on page F-1 of this Prospectus.  In addition, the Company is subject to  the
informational  requirements  of  the  Securities Exchange  Act  of  1934  and in
accordance therewith files reports and other information with the Securities and
Exchange Commission. Reports and other information  filed by the Company can  be
inspected at the public reference facilities maintained by the Commission at 450
Fifth  Street,  N.W., Washington,  D.C. 20549.  Copies of  such material  can be
obtained from the Public Reference  Section of the Commission, Washington,  D.C.
20549 at prescribed rates.
 
    THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING IN ANY JURISDICTION IN WHICH
SUCH  OFFERING MAY NOT LAWFULLY BE MADE. NO DEALER, SALESMAN, OR OTHER PERSON IS
AUTHORIZED TO GIVE  ANY INFORMATION  OR MAKE ANY  REPRESENTATIONS IN  CONNECTION
WITH  THIS OFFERING OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN
OR MADE, SUCH OTHER INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON.
<PAGE>
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                       PAGE
                                                       -----
<S>                                                 <C>
GLOSSARY..........................................           3
HIGHLIGHTS........................................           4
SUMMARY OF VARIABLE ACCOUNT EXPENSES..............           5
CONDENSED FINANCIAL INFORMATION...................           7
YIELD AND TOTAL RETURN DISCLOSURE.................           7
FINANCIAL STATEMENTS..............................           8
GLENBROOK LIFE AND ANNUITY COMPANY AND THE
 VARIABLE ACCOUNT.................................           8
  Glenbrook Life and Annuity Company..............           8
  The Variable Account............................           8
THE FUND SERIES...................................           9
  AIM Variable Insurance Funds, Inc...............           9
  Investment Advisor for the Funds................          10
FIXED ACCOUNT.....................................          10
  Example of Interest Crediting During the
   Guarantee Period...............................          10
  Withdrawals or Transfers........................          11
  Market Value Adjustment.........................          11
PURCHASE OF THE CONTRACTS.........................          12
  Purchase Payment Limits.........................          12
  Free-Look Period................................          12
  Crediting of Initial Purchase Payment...........          12
  Allocation of Purchase Payments.................          12
  Accumulation Units..............................          12
  Accumulation Unit Value.........................          12
  Transfers Among Investment Alternatives.........          12
  Dollar Cost Averaging...........................          13
  Automatic Fund Rebalancing......................          13
BENEFITS UNDER THE CONTRACT.......................          13
  Withdrawals.....................................          13
  Income Payments.................................          14
    Payout Start Date for Income Payments.........          14
    Variable Account Income Payments..............          14
    Fixed Amount Income Payments..................          14
    Income Plans..................................          14
DEATH BENEFITS....................................          15
  Distribution Upon Death Payment Provisions......          15
  Death Benefit Amount............................          15
CHARGES AND OTHER DEDUCTIONS......................          16
  Deductions from Purchase Payments...............          16
  Withdrawal Charge (Contingent Deferred Sales
   Charge)........................................          16
  Contract Maintenance Charge.....................          17
  Administrative Expense Charge...................          17
  Mortality and Expense Risk Charge...............          17
  Taxes...........................................          17
  Transfer Charges................................          17
  Fund Expenses...................................          17
 
<CAPTION>
 
                                                       PAGE
                                                       -----
<S>                                                 <C>
GENERAL MATTERS...................................          18
  Owner...........................................          18
  Beneficiary.....................................          18
  Assignments.....................................          18
  Delay of Payments...............................          18
  Modification....................................          18
  Customer Inquiries..............................          18
FEDERAL TAX MATTERS...............................          18
  Introduction....................................          18
  Taxation of Annuities in General................          19
    Tax Deferral..................................          19
    Non-natural Owners............................          19
    Diversification Requirements..................          19
    Ownership Treatment...........................          19
    Delayed Maturity Dates........................          19
    Taxation of Partial and Full Withdrawals......          19
    Taxation of Annuity Payments..................          20
    Taxation of Annuity Death Benefits............          20
    Penalty Tax on Premature Distributions........          20
    Aggregation of Annuity Contracts..............          20
    Tax Qualified Contracts.......................          20
    Restrictions Under Section 403(b) Plans.......          20
    Income Tax Withholding........................          20
DISTRIBUTION OF THE CONTRACTS.....................          21
VOTING RIGHTS.....................................          21
SELECTED FINANCIAL DATA...........................          21
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
 CONDITION AND RESULTS OF OPERATIONS..............          22
  General.........................................          22
  Results of Operations...........................          22
  Financial Position..............................          22
  Liquidity and Capital Resources.................          23
COMPETITION.......................................          23
EMPLOYEES.........................................          23
PROPERTIES........................................          23
STATE AND FEDERAL REGULATION......................          23
EXECUTIVE OFFICERS AND DIRECTORS OF THE COMPANY...          23
EXECUTIVE COMPENSATION............................          24
LEGAL PROCEEDINGS.................................          25
EXPERTS...........................................          25
LEGAL MATTERS.....................................          25
FINANCIAL STATEMENTS..............................         F-1
APPENDIX A - Market Value Adjustment..............         A-1
STATEMENT OF ADDITIONAL INFORMATION: TABLE OF
 CONTENTS.........................................         B-1
ORDER FORM........................................         B-2
</TABLE>
 
                                       2
<PAGE>
                                    GLOSSARY
 
ACCUMULATION  UNIT: A measure of your ownership interest in a Sub-account of the
Variable  Account  prior  to  the  Payout  Start  Date.  Analogous,  though  not
identical, to a share owned in a mutual fund.
 
ACCUMULATION UNIT VALUE: The value of each Accumulation Unit which is calculated
each  Valuation  Date. Each  Sub-account  of the  Variable  Account has  its own
distinct Accumulation Unit Value. Analogous, though not identical, to the  share
price (net asset value) of a mutual fund.
 
ANNUITANT(S):  The person  or persons  whose life  determines the  latest Payout
Start Date and the amount  and duration of any  income payments for Income  Plan
options  other than Guaranteed Payments for a Specified Period. Joint annuitants
are only permitted on or after the Payout Start Date.
 
BENEFICIARY(IES): The  person(s) to  whom  any benefits  are  due when  a  death
benefit is payable and there is no surviving Owner.
 
COMPANY: Glenbrook Life and Annuity Company.
 
CONTRACT:  The  Glenbrook Life  and  Annuity Company  Flexible  Premium Deferred
Variable  Annuity  Contract,  known  as  the  "AIM  Lifetime  Plus-SM-  Variable
Annuity," that is described in this prospectus.
 
CONTRACT ANNIVERSARY: An anniversary of the date that the Contract was issued.
 
CONTRACT VALUE: The value of all amounts accumulated under the Contract prior to
the  Payout Start Date, equivalent to the Accumulation Units in each Sub-account
of the Variable Account  multiplied by the  respective Accumulation Unit  Value,
plus the value in the Fixed Account.
 
CONTRACT  YEAR:  A period  of  12 months  starting with  the  issue date  or any
Contract Anniversary.
 
DEATH BENEFIT ANNIVERSARY: Every seventh  Contract Anniversary beginning on  the
date  that the Contract  was issued. For  example, the issue  date, 7th and 14th
Contract Anniversaries are the first three Death Benefit Anniversaries.
 
FIXED ACCOUNT:  All of  the  assets of  the Company  that  are not  in  separate
accounts. Also known as the "Market Value Adjusted Account."
 
FIXED  SUB-ACCOUNTS: These Sub-accounts are distinguished by Guarantee Period(s)
and the dates the period(s) begin.  The Fixed Sub-accounts are established  when
purchase payments are allocated to the Fixed Account; when previous Sub-accounts
expire  and a new Guarantee Period is  selected; and when You transfer an amount
to the Fixed Account.
 
GUARANTEE PERIOD:  A period  of years  for which  a specified  effective  annual
interest rate is guaranteed by the Company.
 
INCOME  PLAN: One of several  ways in which a series  of payments are made after
the Payout Start Date. Income payments are based on the Contract Value  adjusted
by  any applicable  Market Value Adjustment  and applicable taxes  on the Payout
Start Date. Income  payment amounts  may vary based  on any  Sub-account of  the
Variable Account and/or may be fixed for the duration of the Income Plan.
 
INVESTMENT  ALTERNATIVES: The Sub-accounts of the Variable Account and the Fixed
Account.
 
MARKET VALUE ADJUSTMENT: The Market Value  Adjustment is the adjustment made  to
the  money distributed from a Sub-account of the Fixed Account, prior to the end
of the Guarantee  Period, to  reflect the impact  of changes  in interest  rates
between  the time the Sub-account  of the Fixed Account  was established and the
time of distribution.
 
NON-QUALIFIED CONTRACTS: Contracts other than Qualified Contracts.
 
OWNER(S)("YOU"): The person or persons designated as the Owner in the Contract.
 
PAYOUT START DATE: The date on which income payments begin.
 
QUALIFIED CONTRACTS:  Contracts  issued under  plans  that qualify  for  special
federal  income tax treatment  under Sections 401(a), 403(a),  403(b) and 408 of
the Internal Revenue Code.
 
VALUATION DATE: Each day that the New York Stock Exchange is open for  business.
The Valuation Date does not include such Federal and non-Federal holidays as are
observed by the New York Stock Exchange.
 
VALUATION  PERIOD: The period between  successive Valuation Dates, commencing at
the close of regular trading on the  New York Stock Exchange (which is  normally
4:00pm  Eastern Time) and ending  as of the close of  regular trading on the New
York Stock Exchange on the next succeeding Valuation Date.
 
VARIABLE ACCOUNT:  Glenbrook Life  and  Annuity Company  Separate Account  A,  a
separate  investment account  established by the  Company to  receive and invest
purchase payments paid under the Contracts.
 
VARIABLE SUB-ACCOUNT: A portion of the Variable Account invested in shares of  a
corresponding  Fund. The investment performance  of each Variable Sub-account is
linked directly to the investment performance of its corresponding Fund.
 
                                       3
<PAGE>
                                   HIGHLIGHTS
 
THE CONTRACT
 
    This  Contract is designed  for long-term financial  planning and retirement
planning. Money can be  allocated to any combination  of Funds and/or the  Fixed
Account.  You have access  to your funds either  through withdrawals of Contract
Value or through periodic income payments.  You bear the entire investment  risk
for Contract Values and income payments based upon the Variable Account, because
values  will vary  depending on  the investment  performance of  the Fund(s) you
select. See "Accumulation Unit Value," page 12 and "Income Plans," page 14.  You
will  also bear the investment risk of  adverse changes in interest rates in the
event amounts are prematurely withdrawn or transferred from Sub-accounts of  the
Fixed Account. See "Fixed Account," page 10.
 
FREE-LOOK
 
    You  may cancel the  Contract any time  within 20 days  after receipt of the
Contract and receive a full refund  of purchase payments allocated to the  Fixed
Account.  Purchase payments allocated  to the Variable  Account will be returned
after an adjustment to  reflect investment gain or  loss that occurred from  the
date of allocation through the date of cancellation, unless a refund of purchase
payments is required by state or federal law. See "Free-Look Period," page 12.
 
HOW TO INVEST
 
    Your  first  purchase  payment  must  be  at  least  $5,000  (for  Qualified
Contracts, $2,000). Subsequent purchase payments must be at least $500. Purchase
payments may  also  be made  pursuant  to  an Automatic  Addition  Program.  See
"Purchase  Payment Limits," page 12.  At the time of  your application, you will
allocate your purchase payment among the Investment Alternatives. The allocation
you specify on the  application will be  effective immediately. All  allocations
must  be in whole percents from 0% to  100% (total allocation equals 100%) or in
whole  dollars  (total  allocation  equals  entire  dollar  amount  of  purchase
payment).  Allocations may be  changed by notifying the  Company in writing. See
"Allocation of Purchase Payments," page 12.
 
INVESTMENT ALTERNATIVES
 
    The Variable Account invests in shares of AIM Variable Insurance Funds, Inc.
(the "Fund Series"). The Fund Series has  a total of nine Funds available  under
the Contract. The Funds include: (1) AIM V.I. Capital Appreciation Fund; (2) AIM
V.I.  Diversified Income Fund; (3) AIM V.I.  Global Utilities Fund; (4) AIM V.I.
Government Securities Fund; (5)  AIM V.I. Growth Fund;  (6) AIM V.I. Growth  and
Income  Fund; (7) AIM V.I. International Equity  Fund; (8) AIM V.I. Money Market
Fund; and (9) AIM V.I. Value Fund.  The assets of each Fund are held  separately
from  the other Funds  and each has distinct  investment objectives and policies
which are  described in  the accompanying  prospectus for  the Fund  Series.  In
addition  to the Variable Account, Owners can also allocate all or part of their
purchase payments to the Fixed Account. See "Fixed Account," on page 10.
 
TRANSFERS AMONG INVESTMENT ALTERNATIVES
 
    Prior to  the  Payout  Start  Date,  you  may  transfer  amounts  among  the
Investment  Alternatives. The Company reserves the  right to assess a $10 charge
on each transfer in excess of twelve per Contract Year. The Company is presently
waiving this  charge. Transfers  to the  Fixed Account  must be  at least  $500.
Certain  Fixed  Account  transfers  may  be  restricted.  See  "Transfers  Among
Investment Alternatives,"  page 12.  You may  want to  enroll in  a Dollar  Cost
Averaging  Program or  an Automatic Fund  Rebalancing Program.  See "Dollar Cost
Averaging," page 13, and "Automatic Fund Rebalancing," page 13.
 
CHARGES AND DEDUCTIONS
 
    The costs  of  the Contract  include:  a contract  maintenance  charge  ($35
annually),  a mortality  and expense  risk charge  (deducted daily,  equal on an
annual basis  to  1.35% of  the  Contract's daily  net  assets of  the  Variable
Account),  and an  administrative expense  charge (deducted  daily, equal  on an
annual basis  to  .10%  of the  Contract's  daily  net assets  of  the  Variable
Account).  The Company reserves  the right to  assess a transfer  charge ($10 on
each transfer in excess of twelve per Contract Year). Additional deductions  may
be  made  for  certain  taxes.  See  "Contract  Maintenance  Charge,"  page  17,
"Mortality and Expense Risk Charge,"  page 17, "Administrative Expense  Charge,"
page 17, "Transfer Charges," page 17, and "Taxes," page 17.
 
WITHDRAWALS
 
    You  may withdraw all or  part of the Contract  Value before the earliest of
the Payout Start Date, the death of any Owner or, if the Owner is not a  natural
person, the death of the Annuitant. Each Contract Year, no withdrawal charges or
Market  Value Adjustments will be applied to  amounts withdrawn up to 10% of the
amount of  purchase payments.  Amounts withdrawn  in excess  of the  10% may  be
subject  to  a withdrawal  charge of  0% to  6% depending  on how  long purchase
payments  have  been  invested  in  the  Contract.  Amounts  withdrawn  from   a
Sub-account of the Fixed Account, in excess of the 10%, except during the 30 day
period  after the Guarantee  Period expires, will  be subject to  a Market Value
Adjustment. See "Withdrawals," page 13, "Withdrawals or Transfers," page 11, and
"Taxation of Annuities in General," page 19.
 
                                       4
<PAGE>
DEATH BENEFIT
 
    The Company will pay a death benefit  prior to the Payout Start Date on  the
death  of any Owner or, if  the Owner is not a  natural person, the death of the
Annuitant. See "Death Benefit Amount," page 15.
 
INCOME PAYMENTS
 
    You will  receive periodic  income payments  beginning on  the Payout  Start
Date.  You  may choose  among several  Income  Plans to  fit your  needs. Income
payments may be received for  a specified period or  for life (either single  or
joint  life), with or  without a guaranteed  number of payments.  You can select
income payments that are fixed, variable or a combination of fixed and variable.
See "Income Payments," page 14.
 
                      SUMMARY OF VARIABLE ACCOUNT EXPENSES
 
    The following table illustrates all expenses  and fees that you will  incur.
The  expenses and  fees set forth  in the table  are based on  charges under the
Contracts and on the  expenses of the Variable  Account and the underlying  Fund
Series.
 
OWNER TRANSACTION EXPENSES (ALL SUB-ACCOUNTS)
 
<TABLE>
<S>                                                                                         <C>
Sales Load Imposed on Purchases (as a percentage of purchase payments)....................        None
Contingent Deferred Sales Charge (as a percentage of purchase payments)...................       *
</TABLE>
 
<TABLE>
<CAPTION>
                                                                         APPLICABLE
                                                                         WITHDRAWAL
YEAR APPLICABLE SINCE                                                      CHARGE
PREMIUM PAYMENT ACCEPTED                                                 PERCENTAGE
- ----------------------------------------------------------------------  ------------
<S>                                                                     <C>
    1st Year..........................................................         6%
    2nd Year..........................................................         6%
    3rd Year..........................................................         5%
    4th Year..........................................................         5%
    5th Year..........................................................         4%
    6th Year..........................................................         4%
    7th Year..........................................................         3%
    Thereafter........................................................         0%
Transfer Fee..........................................................     **
Annual Contract Fee...................................................        $35***
Variable Account Annual Expenses (as a percentage of the Contract's average net
 assets in the Variable Account)
Mortality and Expense Risk Charge.....................................      1.35%
Administrative Expense Charge.........................................      0.10%
Total Variable Account Annual Expenses................................      1.45%
</TABLE>
 
- ------------
 
  *  Each Contract  Year up  to 10% of  the amount  of purchase  payments may be
    withdrawn without  a contingent  deferred  sales charge  or a  Market  Value
    Adjustment.
 
 **  No charges will  be imposed on  the first twelve  transfers in any Contract
    Year. The  Company  reserves the  right  to assess  a  $10 charge  for  each
    transfer  in excess of twelve in  any Contract Year, excluding transfers due
    to dollar cost averaging and automatic fund rebalancing.
 
*** The annual Contract Fee  will be waived if total  purchase payments as of  a
    Contract  Anniversary,  or upon  a full  withdrawal, are  $50,000 or  if all
    monies are allocated to the Fixed Account.
 
                                       5
<PAGE>
                                 FUND EXPENSES
                        (AS A PERCENTAGE OF FUND ASSETS)
 
<TABLE>
<CAPTION>
                                                                                                           TOTAL FUND
                                                                                 MANAGEMENT     OTHER        ANNUAL
                                     FUND                                           FEES       EXPENSES     EXPENSES
- -------------------------------------------------------------------------------  ----------   ----------   ----------
<S>                                                                              <C>          <C>          <C>
AIM V.I. Capital Appreciation Fund.............................................   0.65%         .10%            .75%
AIM V.I. Growth and Income Fund................................................   0.65%         .52%           1.17%
AIM V.I. Global Utilities Fund (after expense reimbursements)..................   0.65%        1.03%           1.68%
AIM V.I. Diversified Income Fund...............................................   0.60%         .28%            .88%
AIM V.I. Government Securities Fund............................................   0.50%         .69%           1.19%
AIM V.I. Growth Fund...........................................................   0.65%         .19%            .84%
AIM V.I. International Equity Fund.............................................   0.75%         .40%           1.15%
AIM V.I. Value Fund............................................................   0.65%         .10%            .75%
AIM V.I. Money Market Fund.....................................................   0.40%         .13%            .53%
</TABLE>
 
EXAMPLE
 
    You (the Owner)  would pay  the following  cumulative expenses  on a  $1,000
investment, assuming a 5% annual return under the following circumstances:
 
    If  you terminate your Contract or annuitize  for a specified period of less
than 120 months at the end of the applicable time period:
 
<TABLE>
<CAPTION>
                                                 FUND                                                      1 YEAR       3 YEARS
- -------------------------------------------------------------------------------------------------------  -----------  -----------
<S>                                                                                                      <C>          <C>
AIM V.I. Capital Appreciation Fund.....................................................................   $      78    $     118
AIM V.I. Growth and Income Fund........................................................................   $      82    $     131
AIM V.I. Global Utilities Fund.........................................................................   $      85    $     140
AIM V.I. Diversified Income Fund.......................................................................   $      79    $     122
AIM V.I. Government Securities Fund....................................................................   $      82    $     131
AIM V.I. Growth Fund...................................................................................   $      79    $     121
AIM V.I. International Equity Fund.....................................................................   $      82    $     130
AIM V.I. Value Fund....................................................................................   $      78    $     118
AIM V.I. Money Market Fund.............................................................................   $      75    $     111
</TABLE>
 
    If you do not terminate  your Contract or if  you annuitize for a  specified
period of 120 months or more at the end of the applicable time period:
 
<TABLE>
<CAPTION>
                                                 FUND                                                      1 YEAR       3 YEARS
- -------------------------------------------------------------------------------------------------------  -----------  -----------
<S>                                                                                                      <C>          <C>
AIM V.I. Capital Appreciation Fund.....................................................................   $      24    $      73
AIM V.I. Growth and Income Fund........................................................................   $      28    $      86
AIM V.I. Global Utilities Fund.........................................................................   $      31    $      95
AIM V.I. Diversified Income Fund.......................................................................   $      25    $      77
AIM V.I. Government Securities Fund....................................................................   $      28    $      86
AIM V.I. Growth Fund...................................................................................   $      25    $      76
AIM V.I. International Equity Fund.....................................................................   $      28    $      85
AIM V.I. Value Fund....................................................................................   $      24    $      73
AIM V.I. Money Market Fund.............................................................................   $      21    $      66
</TABLE>
 
    THE  ABOVE  EXAMPLE SHOULD  NOT BE  CONSIDERED A  REPRESENTATION OF  PAST OR
FUTURE EXPENSE. ACTUAL  EXPENSES MAY BE  GREATER OR LESS  THAN THOSE SHOWN.  The
purpose  of the example is to assist  you in understanding the various costs and
expenses that you will  bear directly or indirectly.  Premium taxes, which  vary
from  0  - 3.5%  depending on  the state  where  the Contract  is sold,  are not
reflected in the example.
 
                                       6
<PAGE>
                        CONDENSED FINANCIAL INFORMATION
                      Accumulation Unit Values and Number
                     of Accumulation Units Outstanding for
                        Each Sub-Account since Inception
 
<TABLE>
<CAPTION>
                                                                                              1995
                                                                                            ---------
<S>                                                                                         <C>
AIM V.I. MONEY MARKET SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period............................................     10.000
  Accumulation Unit Value, End of Period..................................................     10.023
  Number of Units Outstanding, End of Period..............................................          0
AIM V.I. GOVERNMENT SECURITIES SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period............................................     10.000
  Accumulation Unit Value, End of Period..................................................     10.082
  Number of Units Outstanding, End of Period..............................................          0
AIM V.I. DIVERSIFIED INCOME SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period............................................     10.000
  Accumulation Unit Value, End of Period..................................................     10.068
  Number of Units Outstanding, End of Period..............................................          0
AIM V.I. GLOBAL UTILITIES SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period............................................     10.000
  Accumulation Unit Value, End of Period..................................................     10.209
  Number of Units Outstanding, End of Period..............................................          0
AIM V.I. GROWTH AND INCOME SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period............................................     10.000
  Accumulation Unit Value, End of Period..................................................      9.897
  Number of Units Outstanding, End of Period..............................................        103
AIM V.I. VALUE SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period............................................     10.000
  Accumulation Unit Value, End of Period..................................................      9.783
  Number of Units Outstanding, End of Period..............................................        966
AIM V.I. INTERNATIONAL EQUITY SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period............................................     10.000
  Accumulation Unit Value, End of Period..................................................     10.103
  Number of Units Outstanding, End of Period..............................................        936
AIM V.I. GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period............................................     10.000
  Accumulation Unit Value, End of Period..................................................      9.852
  Number of Units Outstanding, End of Period..............................................        104
AIM V.I. CAPITAL APPRECIATION SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period............................................     10.000
  Accumulation Unit Value, End of Period..................................................      9.827
  Number of Units Outstanding, End of Period..............................................        996
</TABLE>
 
    All Sub-Accounts commenced operations on December 4, 1995. The  Accumulation
Unit  Values in this table reflect a  Mortality and Expense Risk Charge of 1.35%
and an Administrative Expense Charge of 0.10%.
 
                       YIELD AND TOTAL RETURN DISCLOSURE
 
    From time to  time the Variable  Account may advertise  the yield and  total
return   investment  performance  of   one  or  more   Sub-accounts.  Yield  and
standardized total  return  advertisements  include  all  charges  and  expenses
attributable to the Contracts. Including these fees has the effect of decreasing
the  advertised performance of a Sub-account, so that a Sub-account's investment
performance will not be directly comparable to that of an ordinary mutual fund.
 
    When a Sub-account advertises its standardized total return it will  usually
be  calculated for one year, five years, and ten years or since inception if the
Sub-account has not been in existence for such periods. Total return is measured
by comparing the value  of an investment  in the Sub-account at  the end of  the
relevant period to the value of the investment at the beginning of the period.
 
                                       7
<PAGE>
    In  addition to the standardized total return, the Sub-account may advertise
a non-standardized total return. This figure will usually be calculated for  one
year,  five years, and ten years or other periods. Non-standardized total return
is measured in the same manner as the standardized total return described above,
except that  the  withdrawal  charges  under  the  Contract  are  not  deducted.
Therefore,  a non-standardized total return for a Sub-account can be higher than
a standardized total return for a Sub-account.
 
    Certain Sub-accounts may advertise yield in addition to total return. Except
in the case of the AIM V.I. Money Market Sub-account, the yield will be computed
in the following  manner: the  net investment income  per unit  earned during  a
recent  one month period  is divided by  the unit value  on the last  day of the
period, and then annualized. This figure  reflects the recurring charges at  the
separate account level.
 
    The  AIM V.I.  Money Market  Sub-account may  advertise, in  addition to the
total return, either yield or the effective yield. The yield in this case refers
to the income generated  by an investment in  that Sub-account over a  seven-day
period  net of recurring  charges at the  separate account level.  The income is
then annualized (i.e., the amount of  income generated by the investment  during
that  week is  assumed to be  generated each week  over a 52-week  period and is
shown as a  percentage of  the investment).  The effective  yield is  calculated
similarly  but when annualized,  the income earned  by an investment  in the AIM
V.I. Money Market Sub-account  is assumed to  be reinvested at  the end of  each
seven-day  period. The  effective yield will  be slightly higher  than the yield
because of the compounding effect of this assumed reinvestment during a  52-week
period.
 
    The  Variable Account  may also disclose  yield, standard  total return, and
non-standard total  return for  periods  prior to  the  date that  the  Variable
Account commenced operations. For periods prior to the date the Variable Account
commenced  operations,  performance  information for  the  Sub-accounts  will be
calculated based on the performance of  the underlying Funds and the  assumption
that  the Sub-accounts were  in existence for  the same periods  as those of the
underlying Funds, with  a level  of charges  equal to  those currently  assessed
against the Sub-accounts.
 
    Please  refer  to  the Statement  of  Additional Information  for  a further
description of the  method used  to calculate  a Sub-account's  yield and  total
return.
 
                              FINANCIAL STATEMENTS
 
    The  financial statements of Glenbrook Life  and Annuity Company are on page
F-1 of the prospectus.  The financial statements of  Glenbrook Life and  Annuity
Company  Separate  Account  A  may  be  found  in  the  Statement  of Additional
Information, which is incorporated by  reference into this prospectus and  which
is available upon request. (See order form on page B-2)
 
          GLENBROOK LIFE AND ANNUITY COMPANY AND THE VARIABLE ACCOUNT
 
GLENBROOK LIFE AND ANNUITY COMPANY
 
    The  Company is  the issuer  of the  Contract. The  Company is  a stock life
insurance company which was organized under the laws of the State of Illinois in
1992. The  Company was  originally organized  under  the laws  of the  State  of
Indiana  in 1965. From  1965 to 1983  the Company was  known as "United Standard
Life Assurance Company" and from 1983 to 1992 the Company was known as  "William
Penn  Life Assurance Company of America." As of the date of this prospectus, the
Company is licensed to operate in the District of Columbia and all states except
New York. The Company intends to  market the Contract in those jurisdictions  in
which  it is licensed to  operate. The Company's home  office is located at 3100
Sanders Road, Northbrook, Illinois 60062.
 
    The Company is a wholly-owned subsidiary of Allstate Life Insurance  Company
("Allstate Life"), a stock life insurance company incorporated under the laws of
the  State of Illinois.  Allstate Life is a  wholly-owned subsidiary of Allstate
Insurance Company  ("Allstate"), a  stock property-liability  insurance  company
incorporated under the laws of Illinois. All of the outstanding capital stock of
Allstate  is owned  by The Allstate  Corporation ("Corporation").  In June 1995,
Sears, Roebuck and Co.  distributed in a tax-free  dividend to its  stockholders
its remaining 80.3% ownership in the Corporation.
 
    The  Company  and  Allstate  Life  entered  into  a  reinsurance  agreement,
effective June 5, 1992. Under the reinsurance agreement, Fixed Account  purchase
payments are automatically transferred to Allstate Life and become invested with
the  assets of Allstate  Life, and Allstate  Life accepts 100%  of the liability
under such  contracts.  However, the  obligations  of Allstate  Life  under  the
reinsurance  agreement are to the Company;  the Company remains the sole obligor
under the Contract to the Owners.
 
THE VARIABLE ACCOUNT
 
    Established on September  6, 1995,  the Glenbrook Life  and Annuity  Company
Separate Account A is a unit investment trust registered with the Securities and
Exchange  Commission under  the Investment  Company Act  of 1940.  However, such
registration does not signify that  the Commission supervises the management  or
investment  practices  or  policies  of  the  Variable  Account.  The investment
performance of  the  Variable  Account  is  entirely  independent  of  both  the
investment  performance of the Company's general  account and the performance of
any other separate account.
 
                                       8
<PAGE>
    The Variable Account has been divided into nine Sub-accounts, each of  which
invests  solely in its corresponding Fund  of AIM Variable Insurance Funds, Inc.
Additional Variable Sub-accounts may be added at the discretion of the Company.
 
    The assets of the Variable Account are held separately from the other assets
of the  Company.  They are  not  chargeable  with liabilities  incurred  in  the
Company's  other business operations. Accordingly, the income, capital gains and
capital losses, realized or unrealized, incurred  on the assets of the  Variable
Account  are credited to or charged against  the assets of the Variable Account,
without regard to the income, capital gains or capital losses arising out of any
other business the Company may conduct. The Company's obligations arising  under
the Contracts are general corporate obligations of the Company.
 
                                THE FUND SERIES
 
    The  Variable Account  will invest in  shares of the  AIM Variable Insurance
Funds, Inc.  (the  "Fund  Series").  The Fund  Series  is  registered  with  the
Securities and Exchange Commission as an open-end, series, management investment
company.  Registration of  the Fund Series  does not involve  supervision of its
management, investment  practices or  policies by  the Securities  and  Exchange
Commission.  The Funds are designed to  provide investment vehicles for variable
insurance contracts of various insurance companies, in addition to the  Variable
Account.
 
    Shares  of the Funds are  not deposits, or obligations  of, or guaranteed or
endorsed by any bank  and the shares  are not federally  insured by the  Federal
Deposit Insurance Corporation, the Federal Reserve Board or any other agency.
 
AIM VARIABLE INSURANCE FUNDS, INC.
 
    AIM  Variable  Insurance Funds,  Inc. offers  nine Funds  for use  with this
Contract: (1) AIM V.I Capital Appreciation Fund; (2) AIM V.I Diversified  Income
Fund;  (3) AIM  V.I. Global Utilities  Fund; (4) AIM  V.I. Government Securities
Fund; (5) AIM V.I.  Growth Fund; (6)  AIM V.I. Growth and  Income Fund; (7)  AIM
V.I. International Equity Fund; (8) AIM V.I. Money Market Fund; and (9) AIM V.I.
Value  Fund.  Each Fund  has different  investment  objectives and  policies and
operates as a separate investment fund. The following is a brief description  of
the investment objectives and programs of the Funds:
 
    AIM  V.I.  CAPITAL  APPRECIATION  FUND ("CAPITAL  APPRECIATION  FUND")  is a
diversified Fund which seeks to provide capital appreciation through investments
in common  stocks, with  emphasis on  medium-sized and  smaller emerging  growth
companies.
 
    AIM   V.I.  DIVERSIFIED  INCOME  FUND   ("DIVERSIFIED  INCOME  FUND")  is  a
diversified Fund which seeks to achieve a high level of current income primarily
by investing  in a  diversified portfolio  of foreign  and U.S.  government  and
corporate  debt  securities, including  lower rated  high yield  debt securities
(commonly known  as "junk  bonds"). The  risks of  investing in  junk bonds  are
described  in the accompanying  prospectus for the Fund  Series, which should be
read carefully before investing.
 
    AIM  V.I.   GLOBAL   UTILITIES  FUND   ("GLOBAL   UTILITIES  FUND")   is   a
non-diversified  Fund which seeks to achieve a high level of current income and,
as  a  secondary  objective,  to  achieve  capital  appreciation,  by  investing
primarily  in common  and preferred stocks  of public  utility companies (either
domestic or foreign).
 
    AIM V.I. GOVERNMENT  SECURITIES FUND  ("GOVERNMENT FUND")  is a  diversified
Fund  which seeks  to achieve  a high  level of  current income  consistent with
reasonable concern  for safety  of  principal by  investing in  debt  securities
issued, guaranteed or otherwise backed by the U.S. Government.
 
    AIM  V.I. GROWTH FUND ("GROWTH  FUND") is a diversified  Fund which seeks to
provide growth  of capital  through investments  primarily in  common stocks  of
leading U.S. companies considered by AIM to have strong earnings momentum.
 
    AIM  V.I. GROWTH AND INCOME  FUND ("GROWTH & INCOME  FUND") is a diversified
Fund which  seeks  to  provide growth  of  capital,  with current  income  as  a
secondary  objective  by investing  primarily in  dividend paying  common stocks
which have prospects for both growth of capital and dividend income.
 
    AIM V.I. INTERNATIONAL EQUITY FUND  ("INTERNATIONAL FUND") is a  diversified
Fund  which  seeks  to  provide  long-term growth  of  capital  by  investing in
international equity securities, the issuers of  which are considered by AIM  to
have strong earnings momentum.
 
    AIM V.I. MONEY MARKET FUND ("MONEY MARKET FUND") is a diversified Fund which
seeks  to provide as  high a level of  current income as  is consistent with the
preservation of capital and liquidity by investing in a diversified portfolio of
money market instruments.
 
    AIM V.I. VALUE  FUND ("VALUE  FUND") is a  diversified Fund  which seeks  to
achieve  long-term growth of capital by investing primarily in equity securities
judged by AIM to be undervalued relative to the current or projected earnings of
the companies issuing the  securities, or relative to  current market values  of
assets  owned by the companies issuing the  securities or relative to the equity
markets generally. Income is a secondary objective.
 
                                       9
<PAGE>
INVESTMENT ADVISOR FOR THE FUNDS
 
    AIM Advisors, Inc., ("AIM") serves as  the investment advisor to each  Fund.
AIM  was organized in 1976 and, together with its affiliates, manages or advises
38 investment company portfolios  (including the Funds). AIM  is a wholly  owned
subsidiary of AIM Management Group Inc., a holding company. AIM manages pursuant
to  a master  investment advisory agreement  dated October 18,  1993, as amended
April 28, 1994. As of April 1, 1996, total assets advised or managed by AIM  and
its affiliates were approximately $48.2 billion.
 
    There  is no  assurance that the  Funds will attain  their respective stated
objectives. Additional  information  concerning the  investment  objectives  and
policies of the Funds can be found in the current prospectus for the Fund Series
accompanying this prospectus.
 
    You will find more complete information about the Funds, including the risks
associated  with each Fund, in the  accompanying prospectus. You should read the
prospectus for the Fund Series in conjunction with this prospectus.
 
    THE FUND SERIES PROSPECTUS SHOULD BE  READ CAREFULLY BEFORE ANY DECISION  IS
MADE  CONCERNING THE  ALLOCATION OF PURCHASE  PAYMENTS TO  A PARTICULAR VARIABLE
SUB-ACCOUNT.
 
                                 FIXED ACCOUNT
 
    Purchase payments and transfers allocated to one or more of the Sub-accounts
of the Fixed Account  become part of  the general account  of the Company.  Each
Sub-account  offers a separate interest rate Guarantee Period. Guarantee Periods
will be offered at the Company's discretion and may range from one to ten years.
Presently, the Company offers Guarantee Periods  of one, three, five, seven  and
ten  years. The Owner must  select the Sub-account(s) in  which to allocate each
purchase payment and transfer.  No less than  $500 may be  allocated to any  one
Sub-account.  The Company reserves  the right to limit  the number of additional
purchase payments. The Fixed Account Investment Alternative may not be available
in all  states.  Please  consult  with your  sales  representative  for  current
information.
 
    Interest  is credited daily to each Sub-account at a rate which compounds to
the effective annual  interest rate  declared for  each Sub-account's  Guarantee
Period that has been selected.
 
    The   following  example  illustrates  how   the  Sub-account  value  for  a
Sub-account of the Fixed Account would  grow given an assumed purchase  payment,
Guarantee Period, and effective annual interest rate:
 
EXAMPLE OF INTEREST CREDITING DURING THE GUARANTEE PERIOD:
 
<TABLE>
<S>                                                                                     <C>
Purchase Payment:.....................................................................  $10,000.00
Guarantee Period:.....................................................................    5 years
Effective Annual Rate:................................................................      5.25%
</TABLE>
 
                             END OF CONTRACT YEAR:
 
<TABLE>
<CAPTION>
                                                             YEAR 1      YEAR 2      YEAR 3      YEAR 4      YEAR 5
                                                           ----------  ----------  ----------  ----------  ----------
<S>                                                        <C>         <C>         <C>         <C>         <C>
Beginning Sub-Account Value                                $10,000.00
  X (1 + Effective Annual Rate)                                1.0525
                                                           ----------
                                                           $10,525.00
Sub-Account Value at end of Contract                                   $10,525.00
  year 1 X (1 + Effective Annual Rate)                                     1.0525
                                                                       ----------
                                                                       $11,077.56
Sub-Account Value at end of Contract                                               $11,077.56
  year 2 X (1 + Effective Annual Rate)                                                 1.0525
                                                                                   ----------
                                                                                   $11,659.13
Sub-Account Value at end of Contract                                                           $11,659.13
  year 3 X (1 + Effective Annual Rate)                                                             1.0525
                                                                                               ----------
                                                                                               $12,271.24
Sub-Account Value at end of Contract                                                                       $12,271.24
  year 4 X (1 + Effective Annual Rate)                                                                         1.0525
                                                                                                           ----------
Sub-Account Value at end of Guarantee Period:                                                              $12,915.48
                                                                                                           ----------
                                                                                                           ----------
TOTAL INTEREST CREDITED IN GUARANTEE PERIOD: $2,915.48 ($12,915.48 - $10,000.00)
</TABLE>
 
NOTE:  The  above illustration assumes  no withdrawals of  any amount during the
       entire  five  year  period.  A  withdrawal  charge  and  a  Market  Value
       Adjustment  may apply  to any  amount withdrawn in  excess of  10% of the
       amount of  purchase  payments.  The hypothetical  interest  rate  is  for
       illustrative purposes only and is not intended to predict future interest
       rates to be declared under the Contract.
 
                                       10
<PAGE>
    The  Company has  no specific formula  for determining the  rate of interest
that it will declare  initially or in  the future. Such  interest rates will  be
reflective  of investment returns available at the time of the determination. In
addition, the management of the Company may also consider various other  factors
in  determining interest rates, including regulatory and tax requirements, sales
commissions and administrative expenses borne  by the Company, general  economic
trends,  and competitive factors. The Company guarantees that the interest rates
will never be less than the minimum  guaranteed rate shown in the Contract.  For
current  interest rate information, please  contact your sales representative or
the Company's Customer Support Unit at 1(800)776-6978.
 
    THE MANAGEMENT OF THE  COMPANY WILL MAKE THE  FINAL DETERMINATION AS TO  THE
INTEREST  RATES TO  BE DECLARED. THE  COMPANY CAN NEITHER  PREDICT NOR GUARANTEE
FUTURE INTEREST RATES TO BE DECLARED.
 
    Prior to the end of a Guarantee Period, a notice will be mailed to the Owner
outlining the options available at the end of a Guarantee Period. During the  30
day period after a Guarantee Period expires the Owner may:
 
    - take  no action and  the Company will  automatically renew the Sub-account
      value to a Guarantee Period of the same duration to be established on  the
      day the previous Guaranteed Period expired; or
 
    - notify  the  Company to  apply the  Sub-account value  to a  new Guarantee
      Period or periods  to be  established on  the day  the previous  Guarantee
      Period expired; or
 
    - notify  the Company to  apply the Sub-account value  to any Sub-account of
      the Variable Account on the day we receive the notification; or
 
    - receive a portion of the Sub-account value or the entire Sub-account value
      through a partial or full withdrawal that is not subject to a Market Value
      Adjustment. In this case, the amount withdrawn will be deemed to have been
      withdrawn on the day the guarantee period expired.
 
    The Automatic Laddering Program allows the Owner to choose, in advance,  one
renewal Guarantee Period for all renewing Sub-accounts. The Owner can select the
Automatic Laddering Program at any time during the accumulation phase, including
on the issue date. The Automatic Laddering Program will continue until the Owner
gives  written  notice  to  the  Company.  The  Company  reserves  the  right to
discontinue this Program. For additional information on the Automatic  Laddering
Program, please call the Company's Customer Support Unit at 1(800)776-6978.
 
WITHDRAWALS OR TRANSFERS
 
    With  the  exception of  transfers  made automatically  through  dollar cost
averaging, all withdrawals and transfers, paid  from a Sub-account of the  Fixed
Account other than during the 30 day period after a Guarantee Period expires are
subject to a Market Value Adjustment.
 
    The  amount  received by  the Owner  under a  withdrawal request  equals the
amount requested, adjusted by any  Market Value Adjustment, less any  applicable
withdrawal  charge (based  upon the amount  requested prior to  any Market Value
Adjustment), less premium taxes and withholding (if applicable).
 
MARKET VALUE ADJUSTMENT
 
    The Market  Value  Adjustment  reflects the  relationship  between  (1)  the
Treasury  Rate for the time remaining in the Guarantee Period at the time of the
request for withdrawal or transfer,  and (2) the Treasury  Rate at the time  the
Sub-account was established. As such, the Owner bears some investment risk under
the Contract. Treasury Rate means the U.S. Treasury Note Constant Maturity yield
for the preceding week as reported in Federal Reserve Bulletin Release H.15.
 
    Generally,  if the Treasury Rate at the time the Sub-account was established
is higher than the applicable current Treasury Rate (interest rate for a  period
equal  to  the  time  remaining  in  the  Sub-account),  then  the  Market Value
Adjustment will result in a higher  amount payable to the Owner or  transferred.
Similarly,  if the Treasury Rate at the  time the Sub-account was established is
lower  than  the  applicable  current  Treasury  Rate,  then  the  Market  Value
Adjustment will result in a lower amount payable to the Owner or transferred.
 
    For  example, assume the  Owner purchases a Contract  and selects an initial
Guarantee Period of five years and the five year Treasury Rate for that duration
is 6.34%.  Assume  that at  the  end  of 3  years,  the Owner  makes  a  partial
withdrawal. If, at that later time, the current two year Treasury Rate is 5.84%,
then  the Market  Value Adjustment  will be  positive, which  will result  in an
increase in the amount payable to the Owner. Similarly, if the current two  year
Treasury Rate is 6.84%, then the Market Value Adjustment will be negative, which
will result in a decrease in the amount payable to the Owner.
 
    The  formula for  calculating the  Market Value  Adjustment is  set forth in
Appendix A to this  prospectus which also  contains additional illustrations  of
the application of the Market Value Adjustment.
 
                                       11
<PAGE>
                           PURCHASE OF THE CONTRACTS
 
PURCHASE PAYMENT LIMITS
 
    Your first purchase payment must be at least $5,000 unless the Contract is a
Qualified  Contract, in which case  the first purchase payment  must be at least
$2,000. All subsequent purchase payments must be $500 or more and may be made at
any time prior to the Payout  Start Date. Subsequent purchase payments may  also
be  made from your bank account  through Automatic Additions. Under an Automatic
Additions Program, the minimum purchase  payment for allocation to the  Variable
Account  is $100 and  for allocation to  the Fixed Account  the minimum purchase
payment is  $500. Please  consult with  your sales  representative for  detailed
information about Automatic Additions.
 
    We  reserve  the right  to limit  the  amount of  purchase payments  we will
accept.
 
FREE-LOOK PERIOD
 
    You may cancel the  Contract any time  within 20 days  after receipt of  the
Contract  and receive a full refund of  purchase payments allocated to the Fixed
Account. Purchase payments allocated  to the Variable  Account will be  returned
after  an adjustment to reflect  investment gain or loss  that occurred from the
date of allocation through the date of cancellation unless a refund of  purchase
payments is required by state or federal law.
 
CREDITING OF INITIAL PURCHASE PAYMENT
 
    The  initial purchase  payment accompanied  by a  duly completed application
will be credited to the  Contract within two business days  of receipt by us  at
our  home office. If  an application is  not duly completed,  we will credit the
purchase payments to the Contract within five business days or return it at that
time unless you specifically  consent to us holding  the purchase payment  until
the  application is  complete. We reserve  the right to  reject any application.
Subsequent purchase payments will  be credited to the  Contract at the close  of
the Valuation Period in which the purchase payment is received by the Company at
its home office.
 
ALLOCATION OF PURCHASE PAYMENTS
 
    On  the application,  you instruct us  how to allocate  the purchase payment
among the Investment  Alternatives. Purchase  payments may be  allocated to  any
Investment  Alternative in  whole percents,  from 0%  to 100%  (total allocation
equals 100%) or in whole dollars  (total allocation equals entire dollar  amount
of  purchase payments).  Unless you notify  us in  writing otherwise, subsequent
purchase payments are  allocated according  to the allocation  for the  previous
purchase payment. Any change in allocation instructions will be effective at the
time we receive the notice in good order.
 
ACCUMULATION UNITS
 
    Each  purchase payment allocated to the Variable Account will be credited to
the Contract as Accumulation Units. For  example, if a $10,000 purchase  payment
is  credited to the Contract  when the Accumulation Unit  value equals $10, then
1,000 Accumulation  Units  would  be  credited to  the  Contract.  The  Variable
Account, in turn, purchases shares of the corresponding Fund.
 
ACCUMULATION UNIT VALUE
 
    The  Accumulation  Units in  each Sub-account  of  the Variable  Account are
valued separately. The value  of Accumulation Units  will change each  Valuation
Period  according to the investment performance  of the shares purchased by each
Variable Sub-account and the deduction of certain expenses and charges.
 
    The value  of  an  Accumulation  Unit in  a  Variable  Sub-account  for  any
Valuation Period equals the value of the Accumulation Unit as of the immediately
preceding  Valuation Period,  multiplied by the  Net Investment  Factor for that
Sub-account for the current  Valuation Period. The Net  Investment Factor for  a
Valuation  Period is a number representing  the change, since the last Valuation
Date in the value of Sub-account assets per Accumulation Unit due to  investment
income,  realized or unrealized  capital gain or loss,  deductions for taxes, if
any, and deductions for the mortality and expense risk charge and administrative
expense charge.
 
TRANSFERS AMONG INVESTMENT ALTERNATIVES
 
    Amounts may be  transferred among  Investment Alternatives,  subject to  the
following restrictions. The Company reserves the right to assess a $10 charge on
each  transfer in excess of  twelve per Contract Year.  The Company is presently
waiving this charge. Transfers to or  from more than one Investment  Alternative
on the same day are treated as one transfer.
 
    Transfers  among Investment Alternatives before the Payout Start Date may be
made at any time. See "Withdrawals  or Transfers," page 11 for the  requirements
on  transfers from  the Fixed  Account. After  the Payout  Start Date, transfers
among Sub-accounts of  the Variable  Account or  from a  variable amount  income
payment  to a fixed amount income payment may be made only once every six months
and may not be made during the first six months following the Payout Start Date.
After the Payout Start  Date, transfers from a  fixed amount income payment  are
not allowed.
 
    Telephone  transfer requests will be accepted  by the Company if received at
1(800)776-6978 by 3:00 p.m., Central Time. Telephone transfer requests  received
at  any other  telephone number  or after  3:00 p.m.,  Central Time  will not be
accepted by the Company. Telephone transfer requests received before 3:00  p.m.,
Central  Time  are effected  at the  next computed  value. The  Company utilizes
procedures which
 
                                       12
<PAGE>
the Company believes will provide reasonable assurance that telephone authorized
transfers are genuine. Such procedures include taping of telephone conversations
with persons purporting to authorize  such transfers and requesting  identifying
information  from such persons. Accordingly, the Company disclaims any liability
for losses resulting from such transfers by reason of their allegedly not having
been properly authorized. However, if the Company does not take reasonable steps
to help ensure that such authorizations are valid, the Company may be liable for
such losses.
 
    The minimum amount that may be  transferred into a Sub-account of the  Fixed
Account  is $500. Any transfer from a Sub-account of the Fixed Account at a time
other than during the  30 day period  after a Guarantee  Period expires will  be
subject  to a Market  Value Adjustment. If  any transfer reduces  the value of a
Sub-account of the Fixed Account to less  than $500, the Company will treat  the
request as a transfer of the entire Sub-account value.
 
    The Company reserves the right to waive transfer restrictions.
 
DOLLAR COST AVERAGING
 
    Transfers  may be made automatically through  Dollar Cost Averaging prior to
the Payout Start  Date. Dollar Cost  Averaging permits the  Owner to transfer  a
specified  amount every month from the  one year Guarantee Period Sub-account of
the Fixed Account or any of the Variable Sub-accounts, to any Sub-account of the
Variable Account. Dollar Cost  Averaging cannot be used  to transfer amounts  to
the  Fixed Account. Transfers made through Dollar Cost Averaging are not subject
to a Market Value Adjustment. In addition, such transfers are not assessed a $10
charge and are not included in the twelve free transfers per Contract Year.
 
    The theory of Dollar  Cost Averaging is that,  if purchases of equal  dollar
amounts are made at fluctuating prices, the aggregate average cost per unit will
be less than the average of the unit prices on the same purchase dates. However,
participation  in the  Dollar Cost  Averaging program does  not assure  you of a
greater profit from  your purchases under  the program; nor  will it prevent  or
alleviate losses in a declining market.
 
AUTOMATIC FUND REBALANCING
 
    Transfers may be made automatically through Automatic Fund Rebalancing prior
to  the Payout Start  Date. By electing  Automatic Fund Rebalancing,  all of the
money allocated to Sub-accounts  of the Variable Account  will be rebalanced  to
the desired allocation on a quarterly basis, determined from the first date that
you  decide  to  rebalance.  Each  quarter,  money  will  be  transferred  among
Sub-accounts of the Variable Account to achieve the desired allocation.
 
    The desired allocation  will be  the allocation  initially selected,  unless
subsequently  changed. You may  change the allocation  at any time  by giving us
written notice. The new allocation will be effective with the first  rebalancing
that  occurs after we  receive the written  request. We are  not responsible for
rebalancing that occurs prior to receipt of the written request.
 
    Transfers made through  Automatic Fund  Rebalancing are not  assessed a  $10
charge and are not included in the twelve free transfers per Contract Year.
 
    Any  money  allocated to  the  Fixed Account  will  not be  included  in the
rebalancing.
 
                          BENEFITS UNDER THE CONTRACT
 
WITHDRAWALS
 
    You may withdraw all or part of the Contract Value at any time prior to  the
earlier  of the  death of  the Owner  (or the  Annuitant if  the Owner  is not a
natural person) or the Payout Start Date. The amount available for withdrawal is
the Contract Value next  computed after the Company  receives the request for  a
withdrawal  at  its  home  office,  adjusted  by  any  applicable  Market  Value
Adjustment, less any  withdrawal charges, contract  maintenance charges and  any
premium  taxes. Withdrawals from the Variable  Account will be paid within seven
days  of  receipt   of  the   request,  subject  to   postponement  in   certain
circumstances. See "Delay of Payments," page 18.
 
    Money  can be withdrawn from  the Variable Account or  the Fixed Account. To
complete the  partial withdrawal  from the  Variable Account,  the Company  will
redeem  Accumulation  Units  in  an  amount  equal  to  the  withdrawal  and any
applicable withdrawal  charge  and  premium  taxes.  The  Owner  must  name  the
Investment  Alternatives from  which the  withdrawal is to  be made.  If none is
named, then the withdrawal request is incomplete and cannot be honored.
 
    The minimum partial withdrawal is $50.  If any withdrawal reduces the  value
of  any Sub-account of  the Fixed Account to  less than $500,  we will treat the
request as a withdrawal of the  entire Sub-account value. If the Contract  Value
after  a partial  withdrawal would  be less than  $1,000, then  the Company will
treat the request as one for termination of the Contract and the entire Contract
Value, adjusted by  any Market Value  Adjustment, less any  charges and  premium
taxes, will be paid out.
 
    Partial  withdrawals  may  also be  taken  automatically  through Systematic
Withdrawals on a  monthly, quarterly,  semi-annual or  annual basis.  Systematic
Withdrawals  of $50  or more may  be requested at  any time prior  to the Payout
Start Date.  At the  Company's  discretion, Systematic  Withdrawals may  not  be
offered in conjunction with Dollar Cost Averaging or Automatic Fund Rebalancing.
 
                                       13
<PAGE>
    Partial  and full  withdrawals may be  subject to  income tax and  a 10% tax
penalty. This tax and  penalty are explained in  "Federal Tax Matters," on  page
18.
 
    After  the Payout Start  Date, withdrawals are  only permitted when payments
from the Variable Account are being made for a specified number of payments only
(i.e. Income  Plan 3).  In that  case, you  may terminate  the Variable  Account
portion  of the income payments at any time  and receive a lump sum equal to the
commuted balance of  the remaining  variable payments due,  less any  applicable
withdrawal charge.
 
INCOME PAYMENTS
PAYOUT START DATE FOR INCOME PAYMENTS
 
    The  Payout Start Date is the day  that income payments will start under the
Contract. You may  change the Payout  Start Date  at any time  by notifying  the
Company  in writing of the  change at least 30  days before the scheduled Payout
Start Date. The Payout Start Date must be (a) at least one month after the issue
date; and (b) no later  than the day the Annuitant  reaches age 90, or the  10th
anniversary of the issue date, if later.
 
VARIABLE ACCOUNT INCOME PAYMENTS
 
    The  amount of Variable Account income  payments depends upon the investment
experience of the Sub-accounts selected by the Owner and any premium taxes,  the
age and sex of the Annuitant, and the Income Plan chosen. The Company guarantees
that  the  amount of  the  income payment  will not  be  affected by  (1) actual
mortality  experience  and  (2)  the  amount  of  the  Company's  administration
expenses.
 
    The  Contracts offered by this prospectus contain income payment tables that
provide for different benefit payments to men and women of the same age  (except
in states which require unisex annuity tables). Nevertheless, in accordance with
the  U.S. Supreme Court's decision in  ARIZONA GOVERNING COMMITTEE V. NORRIS, in
certain employment-related situations, annuity  tables that do  not vary on  the
basis of sex will be used.
 
    The  total  income payments  received may  be  more or  less than  the total
purchase payments made because  (a) Variable Account  income payments vary  with
the  investment results of the underlying Funds, and (b) Annuitants may not live
as long as, or may live longer than, expected.
 
    The Income Plan option selected will affect the dollar amount of each income
payment. For example, if an Income Plan for a Life Income is chosen, the  income
payments  will be greater than  income payments under an  Income Plan for a Life
Income with Guaranteed Payments.
 
    If the actual net investment experience of the Variable Account is less than
the assumed investment rate, then the dollar amount of the income payments  will
decrease.  The dollar amount of  the income payments will  stay level if the net
investment experience equals the assumed  investment rate and the dollar  amount
of  the income payments  will increase if the  net investment experience exceeds
the assumed  investment  rate.  For  purposes of  the  Variable  Account  income
payments,   the  assumed  investment  rate  is  3  percent.  For  more  detailed
information as to how  Variable Account income payments  are determined see  the
Statement of Additional Information.
 
FIXED AMOUNT INCOME PAYMENTS
 
    Income  payment amounts derived from any monies allocated to Sub-accounts of
the Fixed Account during  the accumulation phase are  fixed for the duration  of
the  Income  Plan.  The fixed  amount  income  payment amount  is  calculated by
applying the portion of the  Contract Value in the  Fixed Account on the  Payout
Start  Date, adjusted  by any  Market Value  Adjustment and  less any applicable
premium tax, to  the greater of  the appropriate value  from the income  payment
table selected or such other value as we are offering at that time.
 
INCOME PLANS
 
    The Income Plans include:
 
    INCOME PLAN 1 -- LIFE INCOME WITH GUARANTEED PAYMENTS
 
    The  Company will make payments  for as long as  the Annuitant lives. If the
Annuitant dies before the selected number of guaranteed payments have been made,
the Company will continue to pay the remainder of the guaranteed payments.
 
    INCOME PLAN 2 -- JOINT AND SURVIVOR LIFE INCOME WITH GUARANTEED PAYMENTS
 
    The Company will make payments for as long as either the Annuitant or  Joint
Annuitant,  named at the time  of Income Plan selection,  is living. If both the
Annuitant and the Joint Annuitant die  before the selected number of  guaranteed
payments  have been made, the Company will  continue to pay the remainder of the
guaranteed payments.
 
    INCOME PLAN 3 -- GUARANTEED NUMBER OF PAYMENTS
 
    The Company will make payments for a specified number of months beginning on
the Payout Start Date. These payments do not depend on the Annuitant's life. The
number of months guaranteed  may be from  60 to 360.  The mortality and  expense
risk  charge  will be  deducted from  Variable  Account assets  supporting these
payments even though the Company does not bear any mortality risk.
 
                                       14
<PAGE>
    The Owner may change the Income Plan  until 30 days before the Payout  Start
Date.  If  an Income  Plan is  chosen which  depends on  the Annuitant  or Joint
Annuitant's life, proof of  age will be required  before income payments  begin.
Applicable premium taxes will be assessed.
 
    In  the event  that an Income  Plan is  not selected, the  Company will make
income payments in accordance  with Income Plan 1  with Guaranteed Payments  for
120  Months. At  the Company's discretion,  other Income Plans  may be available
upon request. The Company currently  uses sex-distinct annuity tables.  However,
if  legislation is passed  by Congress or  the states, the  Company reserves the
right to use income payment tables which do not distinguish on the basis of sex.
Special rules and limitations may apply to certain qualified contracts.
 
    If the Contract Value to be applied  to an Income Plan is less than  $2,000,
or  if the monthly payments determined under  the Income Plan are less than $20,
the Company may pay the Contract  Value adjusted by any Market Value  Adjustment
and  less any applicable taxes, in a lump sum or change the payment frequency to
an interval which results in income payments of at least $20.
 
                                 DEATH BENEFITS
 
DISTRIBUTION UPON DEATH PAYMENT PROVISIONS
 
    A distribution upon death  may be paid to  the Owner determined  immediately
after the death if, prior to the Payout Start Date:
 
    - any Owner dies; or
 
    - the Annuitant dies and the Owner is not a natural person.
 
    If  the Owner eligible to receive a distribution upon death is not a natural
person, then the Owner may elect to  receive the distribution upon death in  one
or  more distributions. Otherwise, if  the Owner is a  natural person, the Owner
may elect to receive a distribution upon  death in one or more distributions  or
periodic payments through an Income Plan.
 
    A  death benefit will be  paid: 1) if the Owner  elects to receive the death
benefit in a single payment  distributed within 180 days  of the date of  death;
and 2) if the death benefit is paid as of the day the value of the death benefit
is  determined. Otherwise,  the settlement  value will  be paid.  The settlement
value is the same amount  that would be paid in  the event of withdrawal of  the
Contract  Value. The Company will  calculate the settlement value  at the end of
the Valuation Period coinciding with the requested distribution date for payment
or on the mandatory distribution date of 5 years after the date of death. In any
event, the entire distribution upon death must be distributed within five  years
after  the date of death unless an Income Plan is selected or a surviving spouse
continues the Contract in accordance with the following sections:
 
    Payments from the  Income Plan must  begin within  one year of  the date  of
death and must be payable throughout:
 
    - the life of the Owner; or
 
    - a period not to exceed the life expectancy of the Owner; or
 
    - the  life of the Owner with payments guaranteed for a period not to exceed
      the life expectancy of the Owner.
 
    If the surviving spouse  of the deceased  Owner is the  new Owner, then  the
spouse may elect one of the options listed above or may continue the Contract in
the  accumulation phase as if the death  had not occurred. The Company will only
permit the Contract to be  continued once. If the  Contract is continued in  the
accumulation  phase, the  surviving spouse may  make a single  withdrawal of any
amount within  one year  of the  date of  death without  incurring a  withdrawal
charge.  However, any applicable  Market Value Adjustment,  determined as of the
date of the withdrawal, will apply.
 
DEATH BENEFIT AMOUNT
 
    Prior to the Payout Start Date, the  death benefit is equal to the  greatest
of:
 
    (a)  the  Contract  Value  on  the date  the  Company  determines  the death
         benefit; or
 
    (b)  the amount  that  would  have been  payable  in  the event  of  a  full
         withdrawal of the Contract Value on the date the Company determines the
         death benefit; or
 
    (c)  the  Contract  Value  on  the  Death  Benefit  Anniversary  immediately
         preceding the date the Company determines the death benefit adjusted by
         any purchase payments, withdrawals and charges made between such  Death
         Benefit  Anniversary  and the  date  the Company  determines  the death
         benefit.  A  Death  Benefit  Anniversary  is  every  seventh   Contract
         Anniversary beginning with the issue date. For example, the issue date,
         7th  and 14th Contract Anniversaries are  the first three Death Benefit
         Anniversaries.
 
    In addition to the above options,  upon purchase of the Contract, the  Owner
can select one of the following enhanced death benefit options:
 
    (A)  the  greatest of the anniversary values as of the date we determine the
         death benefit. The anniversary value is equal to the Contract Value  on
         a  Contract Anniversary, increased by purchase payments made since that
         anniversary and reduced by the
 
                                       15
<PAGE>
         amount of any partial  withdrawals since that anniversary.  Anniversary
         values  will be calculated  for each Contract  Anniversary prior to the
         earlier of: (i) the  date we determine the  death benefit, or (ii)  the
         deceased's  attained age 75 or 5 years  after the date the Contract was
         established, if later; or
 
    (B)  total purchase payments minus the sum of all partial withdrawals.  Each
         purchase  payment and each partial  withdrawal will accumulate daily at
         rate equivalent to 5% per  year until the earlier  of: (i) the date  we
         determine  the  death  benefit, or  (ii)  the  first day  of  the month
         following the deceased's 75th birthday or 5 years after the issue date,
         if later.
 
    If neither option is selected by the Owner, the Contract will  automatically
include option (A). The value of the death benefit will be determined at the end
of the Valuation Period during which the Company receives a complete request for
payment of the death benefit, which includes due proof of death.
 
    The  Company will not settle any death  claim until it receives due proof of
death.
 
                          CHARGES AND OTHER DEDUCTIONS
 
DEDUCTIONS FROM PURCHASE PAYMENTS
 
    No deductions are made from purchase payments. Therefore, the full amount of
every purchase payment is invested in the Investment Alternative(s).
 
WITHDRAWAL CHARGE (CONTINGENT DEFERRED SALES CHARGE)
 
    You may withdraw the Contract Value at  any time before the earliest of  the
Payout  Start Date, the  death of any  Owner or, if  the Owner is  not a natural
person, the death of the Annuitant.
 
    There are no withdrawal charges on amounts withdrawn up to 10% of the amount
of purchase payments. Amounts withdrawn  in excess of this  may be subject to  a
withdrawal  charge. Amounts not subject to a withdrawal charge and not withdrawn
in a Contract  Year are  not carried over  to later  Contract Years.  Withdrawal
charges, if applicable, will be deducted from the amount paid.
 
    Free  withdrawals and other partial withdrawals will be allocated on a first
in, first out basis to purchase payments. For purposes of calculating the amount
of the withdrawal charge, withdrawals are assumed to come from purchase payments
first, beginning with the  oldest payment. Withdrawals  made after all  purchase
payments  have been withdrawn, will  not be subject to  a withdrawal charge. For
partial withdrawals, the Contract Value will  be adjusted to reflect the  amount
of  payment received by  the Owner, any withdrawal  charge, any applicable taxes
and any Market Value Adjustment.
 
    Withdrawals in excess  of the free  withdrawal amount will  be subject to  a
withdrawal charge as set forth below:
 
<TABLE>
<CAPTION>
                                                                         APPLICABLE
                                                                         WITHDRAWAL
YEAR APPLICABLE SINCE                                                      CHARGE
PREMIUM PAYMENT ACCEPTED                                                 PERCENTAGE
- ----------------------------------------------------------------------  ------------
<S>                                                                     <C>
    1st Year..........................................................         6%
    2nd Year..........................................................         6%
    3rd Year..........................................................         5%
    4th Year..........................................................         5%
    5th Year..........................................................         4%
    6th Year..........................................................         4%
    7th Year..........................................................         3%
    Thereafter........................................................         0%
</TABLE>
 
    Withdrawal  charges  will  be  used  to  pay  sales  commissions  and  other
promotional or  distribution  expenses  associated with  the  marketing  of  the
Contracts.  The Company  does not  anticipate that  the withdrawal  charges will
cover all distribution expenses in connection with the Contract.
 
    In addition, federal and  state income tax may  be withheld from  withdrawal
amounts.  Certain terminations may also be subject to a federal tax penalty. See
"Federal Tax Matters," page 18.
 
    The Company reserves the right to  waive the withdrawal charge with  respect
to   Contracts  issued  to  employees  and  registered  representatives  of  any
broker-dealer that  has  entered  into  a sales  agreement  with  Allstate  Life
Financial  Services, Inc. ("ALFS") to sell the Contracts and all wholesalers and
their employees that are under agreement with ALFS to wholesale the Contract. In
addition, the Company will waive any withdrawal charge prior to the Payout Start
Date if at least 30 days after the Contract Date any Owner (or Annuitant if  the
Owner is not a natural person) is first confined to a long term care facility or
hospital  for  at least  90  consecutive days,  confinement  is prescribed  by a
physician and  is medically  necessary, and  the request  for a  withdrawal  and
adequate  written proof of confinement are received  by us no later than 90 days
after discharge. The withdrawal charge will also be waived on withdrawals  taken
to satisfy IRS required minimum distribution rules for this Contract.
 
                                       16
<PAGE>
CONTRACT MAINTENANCE CHARGE
 
    A  contract maintenance charge is deducted  annually from the Contract Value
to reimburse the Company for its  actual costs in maintaining each Contract  and
the Variable Account. The Company guarantees that the amount of this charge will
not exceed $35 per Contract Year over the life of the Contract. This charge will
be  waived if  the total  purchase payments  are $50,000  or more  on a Contract
Anniversary or if all money  is allocated to the  Fixed Account on the  Contract
Anniversary.
 
    Maintenance  costs  include  but are  not  limited to  expenses  incurred in
billing and  collecting purchase  payments;  keeping records;  processing  death
claims,  cash  withdrawals, and  policy  changes; proxy  statements; calculating
Accumulation Unit and  Annuity Unit values;  and issuing reports  to Owners  and
regulatory  agencies. The Company does not expect  to realize a profit from this
charge.
 
    On each Contract Anniversary  prior to the payout  start date, the  contract
maintenance charge will be deducted from Sub-accounts of the Variable Account in
the  same proportion that the Owner's value in  each bears to the total value in
all Sub-accounts of  the Variable Account.  After the Payout  Start Date, a  pro
rata  share of the annual contract maintenance charge will be deducted from each
income payment. For  example, 1/12 of  the $35,  or $2.92, will  be deducted  if
there  are  twelve income  payments during  the Contract  Year. A  full contract
maintenance charge will be  deducted if the Contract  is terminated on any  date
other than a Contract Anniversary.
 
ADMINISTRATIVE EXPENSE CHARGE
 
    The  Company will deduct an administrative expense charge which is equal, on
an annual basis,  to .10%  of the  daily net assets  you have  allocated to  the
Sub-accounts  of the Variable  Account. This charge is  designed to cover actual
administrative expenses which exceed the revenues from the contract  maintenance
charge.  The Company  does not  intend to profit  from this  charge. The Company
believes that the administrative expense charge and contract maintenance  charge
have  been  set at  a level  that will  recover  no more  than the  actual costs
associated with administering the Contracts. There is no necessary  relationship
between  the amount of administrative charge imposed on a given Contract and the
amount of expenses that may be attributable to that Contract.
 
MORTALITY AND EXPENSE RISK CHARGE
 
    The Company will deduct a mortality and expense risk charge which is  equal,
on  an annual basis, to 1.35% of the  daily net assets you have allocated to the
Sub-accounts of  the  Variable  Account.  The Company  estimates  that  .95%  is
attributable  to the assumption  of mortality risks and  .40% is attributable to
the assumption of expense risks. The Company guarantees that the amount of  this
charge will not increase over the life of the Contract.
 
    The  mortality risk arises  from the Company's guarantee  to cover all death
benefits and to make income payments in accordance with the Income Plan selected
and the Income Payment Tables.
 
    The expense risk arises from  the possibility that the contract  maintenance
and administrative expense charge, both of which are guaranteed not to increase,
will be insufficient to cover actual administrative expenses.
 
    If  the  mortality and  expense  risk charge  is  insufficient to  cover the
Company's mortality costs and excess expenses,  the Company will bear the  loss.
If  the charge is more  than sufficient, the Company  will retain the balance as
profit. The  Company currently  expects  a profit  from  this charge.  Any  such
profit,  as well  as any other  profit realized by  the Company and  held in its
general account (which  supports insurance  and annuity  obligations), would  be
available  for  any proper  corporate purpose,  including,  but not  limited to,
payment of distribution expenses.
 
TAXES
 
    The Company  will deduct  applicable state  premium taxes  or other  similar
policyholder  taxes  relative  to  the  Contract  (collectively  referred  to as
"premium taxes") either  at the Payout  Start Date, or  when a total  withdrawal
occurs. Current premium tax rates range from 0 to 3.5%. The Company reserves the
right to deduct premium taxes from the purchase payments.
 
    At the Payout Start Date, the charge for premium taxes will be deducted from
each  Investment Alternative  in the  proportion that  the Owner's  value in the
Investment Alternative bears to the total Contract Value.
 
TRANSFER CHARGES
 
    The Company reserves the right  to assess a $10  charge on each transfer  in
excess  of twelve  per Contract  Year, excluding  transfers through  Dollar Cost
Averaging and Automatic Fund Rebalancing. The Company is presently waiving  this
charge.
 
FUND EXPENSES
 
    A  complete description  of the  expenses and  deductions from  the Funds is
found in the prospectus for the  Fund Series. This prospectus is accompanied  by
the prospectus for the Fund Series.
 
                                       17
<PAGE>
                                GENERAL MATTERS
 
OWNER
 
    The Owner has the sole right to exercise all rights and privileges under the
Contract,  except as otherwise provided in  the Contract. The Contract cannot be
jointly owned by both a non-natural person and a natural person.
 
BENEFICIARY
 
    Subject to the terms of  any irrevocable Beneficiary designation, the  Owner
may  change the Beneficiary at any time by notifying the Company in writing. Any
change will be effective at the time it  is signed by the Owner, whether or  not
the  Annuitant is living when the change is received by the Company. The Company
will not, however,  be liable  as to  any payment  or settlement  made prior  to
receiving the written notice.
 
    Unless  otherwise provided in the  Beneficiary designation, if a Beneficiary
predeceases the Owner and  there are no other  surviving beneficiaries, the  new
Beneficiary  will  be:  the Owner's  spouse  if living;  otherwise,  the Owner's
children,  equally,  if   living;  otherwise,  the   Owner's  estate.   Multiple
Beneficiaries  may  be  named.  Unless  otherwise  provided  in  the Beneficiary
designation, if  more than  one Beneficiary  survives the  Owner, the  surviving
Beneficiaries will share equally in any amounts due.
 
ASSIGNMENTS
 
    The  Company will not  honor an assignment  of an interest  in a Contract as
collateral or security  for a  loan. Otherwise,  the Owner  may assign  benefits
under  the Contract prior  to the Payout  Start Date. No  Beneficiary may assign
benefits under the  Contract until  they are due.  No assignment  will bind  the
Company unless it is signed by the Owner and filed with the Company. The Company
is  not responsible for the validity of  an assignment. Federal law prohibits or
restricts the assignment of  benefits under many types  of retirement plans  and
the terms of such plans may themselves contain restrictions on assignments.
 
DELAY OF PAYMENTS
 
    Payment of any amounts due from the Variable Account under the Contract will
occur within seven days, unless:
 
    1.   The New York Stock Exchange is  closed for other than usual weekends or
       holidays, or trading on the Exchange is otherwise restricted;
 
    2.    An  emergency  exists  as  defined  by  the  Securities  and  Exchange
       Commission; or
 
    3.   The Securities and Exchange Commission permits delay for the protection
       of the Owners.
 
    Payments or transfers  from the Fixed  Account may  be delayed for  up to  6
months.
 
MODIFICATION
 
    The  Company may not  modify the Contract  without the consent  of the Owner
except to make the Contract meet the requirements of the Investment Company  Act
of 1940, or to make the Contract comply with any changes in the Internal Revenue
Code or to make any changes required by the Code or by any other applicable law.
 
CUSTOMER INQUIRIES
 
    The  Owner  or any  persons interested  in the  Contract may  make inquiries
regarding the Contract by calling or writing your representative or the  Company
at:
 
                       GLENBROOK LIFE AND ANNUITY COMPANY
                             POST OFFICE BOX 94039
                         PALATINE, ILLINOIS 60094-4039
                                1-(800) 776-6978
 
                              FEDERAL TAX MATTERS
 
INTRODUCTION
 
    THE  FOLLOWING DISCUSSION IS GENERAL AND IS  NOT INTENDED AS TAX ADVICE. THE
COMPANY MAKES  NO GUARANTEE  REGARDING  THE TAX  TREATMENT  OF ANY  CONTRACT  OR
TRANSACTION   INVOLVING  A  CONTRACT.  Federal,   state,  local  and  other  tax
consequences of ownership or receipt of distributions under an annuity  contract
depend  on the  individual circumstances  of each  person. If  you are concerned
about any tax  consequences with  regard to your  individual circumstances,  you
should consult a competent tax adviser.
 
                                       18
<PAGE>
TAXATION OF ANNUITIES IN GENERAL
TAX DEFERRAL
 
    Generally,  an  annuity contract  owner  is not  taxed  on increases  in the
Contract Value until a distribution occurs. This rule applies only where (1) the
owner is  a natural  person, (2)  the investments  of the  Variable Account  are
"adequately diversified" in accordance with Treasury Department Regulations, and
(3)  the issuing insurance company, instead  of the annuity owner, is considered
the owner for federal income tax purposes of any separate account assets funding
the contract.
 
NON-NATURAL OWNERS
 
    As a general rule,  annuity contracts owned by  non-natural persons such  as
corporations, trusts, or other entities are not treated as annuity contracts for
federal  income  tax purposes  and  the income  on  such contracts  is  taxed as
ordinary income received or accrued by the owner during the taxable year.  There
are  several exceptions to  the general rule for  contracts owned by non-natural
persons which are discussed in the Statement of Additional Information.
 
DIVERSIFICATION REQUIREMENTS
 
    For a Contract to be treated as an annuity for federal income tax  purposes,
the  investments in  the Variable  Account must  be "adequately  diversified" in
accordance with  the standards  provided  in the  Treasury regulations.  If  the
investments  in the  Variable Account are  not adequately  diversified, then the
Contract will  not be  treated as  an annuity  contract for  federal income  tax
purposes  and the Owner will  be taxed on the excess  of the Contract Value over
the investment in the Contract. Although the Company does not have control  over
the  Funds  or their  investments, the  Company  expects the  Funds to  meet the
diversification requirements.
 
OWNERSHIP TREATMENT
 
    In  connection  with  the  issuance  of  the  regulations  on  the  adequate
diversification  standards, the  Department of  the Treasury  announced that the
regulations do  not provide  guidance concerning  the extent  to which  contract
owners  may direct their  investments among Sub-accounts  of a variable account.
The Internal Revenue Service has previously  stated in published rulings that  a
variable  contract owner will be considered the owner of separate account assets
if the  owner possesses  incidents of  ownership  in those  assets such  as  the
ability  to  exercise  investment  control  over the  assets.  At  the  time the
diversification regulations were issued, Treasury announced that guidance  would
be  issued in  the future  regarding the extent  that owners  could direct their
investments among Sub-accounts without being treated as owners of the underlying
assets of the  Variable Account.  As of  the date  of this  prospectus, no  such
guidance has been issued.
 
    The  ownership rights under  this contract are similar  to, but different in
certain respects from, those described by the Service in rulings in which it was
determined that contract owners were not owners of separate account assets.  For
example, the owner of this contract has the choice of more investment options to
which  to allocate  premiums and  contract values, and  may be  able to transfer
among investment options more frequently than in such rulings. These differences
could result in the contract owner being  treated as the owner of the assets  of
the Variable Account. In those circumstances, income and gains from the Variable
Account  assets would  be includible  in the  Contract Owners'  gross income. In
addition, the Company  does not know  what standards  will be set  forth in  the
regulations  or rulings which  the Treasury Department has  stated it expects to
issue. It is possible  that Treasury's position,  when announced, may  adversely
affect the tax treatment of existing contracts. The Company, therefore, reserves
the  right to modify the  Contract as necessary to  attempt to prevent the Owner
from being  considered the  federal tax  owner  of the  assets of  the  Variable
Account.  However, the Company makes no  guarantee that such modification to the
contract will be successful.
 
DELAYED MATURITY DATES
 
    If the contract's scheduled  maturity date is at  a time when the  annuitant
has reached an advanced age, e.g., past age 85, it is possible that the contract
would  not be treated as  an annuity. In that event,  the income and gains under
the contract could be currently includible in the owner's income.
 
TAXATION OF PARTIAL AND FULL WITHDRAWALS
 
    In the case of a partial withdrawal under a non-qualified contract,  amounts
received  are taxable  to the  extent the  contract value  before the withdrawal
exceeds the investment in  the contract. The investment  in the contract is  the
gross  premium  or other  consideration  paid for  the  contract reduced  by any
amounts previously received from  the contract to the  extent such amounts  were
properly  excluded  from the  owner's gross  income.  In the  case of  a partial
withdrawal under a qualified contract, the portion of the payment that bears the
same ratio  to the  total payment  that the  investment in  the contract  (i.e.,
nondeductible  IRA contributions,  after tax  contributions to  qualified plans)
bears to the contract value, can be excluded from income. In the case of a  full
withdrawal  under a non-qualified  contract or a  qualified contract, the amount
received will be taxable  only to the  extent it exceeds  the investment in  the
contract.  If  an  individual transfers  an  annuity contract  without  full and
adequate consideration to a person other  than the individual's spouse (or to  a
former  spouse incident to a divorce), the owner will be taxed on the difference
between the contract value  and the investment  in the contract  at the time  of
transfer.  Other than  in the  case of  certain qualified  contracts, any amount
received as a loan under a contract, and any assignment or pledge (or  agreement
to assign or
 
                                       19
<PAGE>
pledge)  of the  contract value  is treated  as a  withdrawal of  such amount or
portion. The contract provides a death benefit that in certain circumstances may
exceed the  greater  of  the  payments and  the  contract  value.  As  described
elsewhere in the prospectus, the Company imposes certain charges with respect to
the  death benefit. It is  possible that some portion  of those charges could be
treated for federal tax purposes as a partial withdrawal from the contract.
 
TAXATION OF ANNUITY PAYMENTS
 
    Generally, the rule for income taxation of payments received from an annuity
contract provides for the  return of the owner's  investment in the contract  in
equal  tax-free amounts  over the  payment period.  The balance  of each payment
received is  taxable. In  the  case of  variable  annuity payments,  the  amount
excluded  from taxable  income is determined  by dividing the  investment in the
contract by the total number of expected payments. In the case of fixed  annuity
payments,  the  amount excluded  from income  is  determined by  multiplying the
payment by the ratio of the investment in the contract (adjusted for any  refund
feature  or period certain) to the total  expected value of annuity payments for
the term  of the  contract.  Once the  total amount  of  the investment  in  the
contract  is excluded  using these  ratios, the  annuity payments  will be fully
taxable. If annuity payments cease because of the death of the annuitant  before
the total amount of the investment in the contract is recovered, the unrecovered
amount  generally will be allowed  as a deduction to  the annuitant for his last
taxable year.
 
TAXATION OF ANNUITY DEATH BENEFITS
 
    Amounts may be distributed from an annuity contract because of the death  of
an  owner  or annuitant.  Generally, such  amounts are  includible in  income as
follows: (1) if distributed  in a lump  sum, the amounts are  taxed in the  same
manner  as a full withdrawal or (2)  if distributed under an annuity option, the
amounts are taxed in the same manner as an annuity payment.
 
PENALTY TAX ON PREMATURE DISTRIBUTIONS
 
    There is  a  10%  penalty  tax  on  the  taxable  amount  of  any  premature
distribution  from a non-qualified  annuity contract. The  penalty tax generally
applies to  any distribution  made prior  to  the owner  attaining age  59  1/2.
However,  there should be no penalty tax  on distributions to owners (1) made on
or after the owner attains age 59 1/2; (2) made as a result of the owner's death
or disability; (3) made  in substantially equal periodic  payments over life  or
life  expectancy; (4) made under an immediate annuity; or (5) attributable to an
investment in  the contract  before August  14, 1982.  Similar rules  apply  for
distributions  under certain qualified contracts. A competent tax advisor should
be consulted to determine if any other  exceptions to the penalty apply to  your
specific circumstances.
 
AGGREGATION OF ANNUITY CONTRACTS
 
    All  non-qualified deferred annuity contracts issued  by the Company (or its
affiliates) to the same  owner during any calendar  year will be aggregated  and
treated  as one annuity contract for  purposes of determining the taxable amount
of a distribution.
 
TAX QUALIFIED CONTRACTS
 
    Annuity contracts  may be  used as  investments with  certain tax  qualified
plans  such as: (1) Individual Retirement  Annuities under Section 408(b) of the
Code; (2) Simplified Employee  Pension Plans under Section  408(k) of the  Code;
(3)  Tax Sheltered Annuities under Section 403(b) of the Code; (4) Corporate and
Self Employed  Pension  and  Profit  Sharing Plans;  and  (5)  State  and  Local
Government  and Tax-Exempt Organization Deferred Compensation Plans. In the case
of certain tax qualified plans, the terms  of the plans may govern the right  to
benefits, regardless of the terms of the contract.
 
RESTRICTIONS UNDER SECTION 403(B) PLANS
 
    Section  403(b)  of the  Code provides  for tax-deferred  retirement savings
plans for  employees of  certain non-profit  and educational  organizations.  In
accordance  with the requirements  of Section 403(b),  any annuity contract used
for a  403(b)  plan  must  provide that  distributions  attributable  to  salary
reduction  contributions  made  after  12/31/88,  and  all  earnings  on  salary
reduction contributions, may be made only after the employee attains age 59 1/2,
separates from  service,  dies,  becomes  disabled or  on  account  of  hardship
(earnings  on  salary  reduction contributions  may  not be  distributed  on the
account of hardship). These  limitations do not apply  to withdrawals where  the
Company  is directed to  transfer some or  all of the  contract value to another
Section 403(b) plans.
 
INCOME TAX WITHHOLDING
 
    The Company is required to withhold federal  income tax at a rate of 20%  on
all  "eligible rollover  distributions" unless  an individual  elects to  make a
"direct rollover"  of  such amounts  to  another qualified  plan  or  Individual
Retirement  Account or Annuity (IRA).  Eligible rollover distributions generally
include all distributions  from qualified  contracts, excluding  IRAs, with  the
exception   of  (1)  required   minimum  distributions,  or   (2)  a  series  of
substantially equal periodic payments made over  a period of at least 10  years,
or  the  life  (joint  lives)  of the  participant  (and  beneficiary).  For any
distributions  from  non-qualified  annuity  contracts,  or  distributions  from
qualified  contracts which  are not considered  eligible rollover distributions,
the Company may be  required to withhold federal  and state income taxes  unless
the  recipient  elects not  to  have taxes  withheld  and properly  notifies the
Company of such election.
 
                                       20
<PAGE>
                         DISTRIBUTION OF THE CONTRACTS
 
    Allstate  Life  Financial  Services,  Inc.  ("ALFS"),  3100  Sanders   Road,
Northbrook  Illinois,  a  wholly  owned subsidiary  of  Allstate  Life Insurance
Company, acts as the principal underwriter of the Contracts. ALFS is  registered
as a broker-dealer under the Securities Exchange Act of 1934 and became a member
of  the  National Association  of  Securities Dealers,  Inc.  on June  30, 1993.
Contracts are sold by registered representatives of unaffiliated  broker-dealers
or  bank employees who  are licensed insurance agents  appointed by the Company,
either individually or  through an  incorporated insurance agency  and who  have
entered into a selling agreement with ALFS to sell the Contract. In some states,
Contracts  may be  sold by  representatives or employees  of banks  which may be
acting as  broker-dealers without  separate  registration under  the  Securities
Exchange Act of 1934, pursuant to legal and regulatory exceptions.
 
    Commissions  paid may vary,  but in aggregate are  not anticipated to exceed
6.75% of any purchase payment. In addition, under certain circumstances, certain
sellers of the Contracts  may be paid persistency  bonuses which will take  into
account, among other things, the length of time purchase payments have been held
under  a Contract, and Contract  Values. A persistency bonus  is not expected to
exceed 1.20%,  on  an  annual  basis,  of  the  Contract  Values  considered  in
connection  with the bonus. These commissions are intended to cover distribution
expenses.
 
    The underwriting agreement with ALFS provides for indemnification of ALFS by
the Company  for  liability  to  Owners arising  out  of  services  rendered  or
Contracts issued.
 
                                 VOTING RIGHTS
 
    The  Owner  or anyone  with  a voting  interest  in the  Sub-account  of the
Variable Account may instruct the Company on how to vote at shareholder meetings
of the Fund Series. The Company will solicit and cast each vote according to the
procedures set up  by the Fund  Series and to  the extent required  by law.  The
Company  reserves the  right to vote  the eligible  shares in its  own right, if
subsequently permitted by the Investment Company Act of 1940, its regulations or
interpretations thereof.
 
    Fund shares as to which no timely instructions are received will be voted in
proportion to the  voting instructions which  are received with  respect to  all
Contracts  participating in that Sub-account.  Voting instructions to abstain on
any item to  be voted upon  will be applied  on a pro-rata  basis to reduce  the
votes eligible to be cast.
 
    Before  the Payout Start  Date, the Owner  holds the voting  interest in the
Sub-account of the Variable Account (The number  of votes for the Owner will  be
determined  by dividing the Contract Value  attributable to a Sub-account by the
net asset value per share of the applicable eligible Fund.)
 
    After the Payout Start  Date, the person receiving  income payments has  the
voting  interest.  After the  Payout Start  Date, the  votes decrease  as income
payments are made and as the  reserves for the Contract decrease. That  person's
number  of votes will  be determined by  dividing the reserve  for such Contract
allocated to the applicable Sub-account by the net asset value per share of  the
corresponding eligible Fund.
 
                            SELECTED FINANCIAL DATA
 
    The  following selected  financial data  for the  Company should  be read in
conjunction with the  1995 financial  statements and notes  thereto included  in
this Prospectus beginning on page F-1 and the 1994 and 1993 financial statements
and notes thereto incorporated by reference in this prospectus.
 
                       GLENBROOK LIFE AND ANNUITY COMPANY
                            SELECTED FINANCIAL DATA
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
YEAR-END FINANCIAL DATA                                                           1995       1994       1993      1992(2)
- -----------------------------------------------------------------------------  ----------  ---------  ---------  ---------
<S>                                                                            <C>         <C>        <C>        <C>
For The Years Ended December 31:
  Income Before Taxes........................................................  $    4,455  $   2,017  $     836  $     337
  Net Income.................................................................       2,879      1,294        529        212
As of December 31:
    Total Assets(1)..........................................................   1,409,705    750,245    169,361     12,183
</TABLE>
 
- ------------
 
(1)  The Company  adopted SFAS No.  115, "Accounting for  Certain Investments in
    Debt and  Equity  Securities"  on December  31,  1993.  See Note  3  to  the
    Financial Statements.
 
(2)  For the  period from April  1, 1992  (date of acquisition)  to December 31,
    1992.
 
                                       21
<PAGE>
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
GENERAL
 
    The  following  highlights  significant   factors  influencing  results   of
operations and financial position.
 
    Glenbrook Life and Annuity Company ("the Company"), which is wholly owned by
Allstate  Life Insurance  Company ("Allstate  Life"), currently  issues flexible
premium fixed  annuities,  and  beginning in  1995,  flexible  premium  deferred
variable  annuity contracts through  its Separate Accounts.  The Company markets
its products through banks and other financial institutions.
 
    The Company reinsures all  of its annuity deposits  with Allstate Life,  and
all  life insurance in  force with other  reinsurers. Accordingly, the financial
results reflected in the Company's statements  of operations relate only to  the
investment  of those assets of the Company  that are not transferred to Allstate
Life or other reinsurers under the reinsurance treaties.
 
    Separate Account assets and liabilities  are legally segregated and  carried
at  fair value  in the  statements of  financial position.  The Separate Account
investment portfolios  were  initially funded  with  a $10  million  seed  money
contribution  from the Company in 1995. Investment income and realized gains and
losses of the Separate  Account investments, other than  the portion related  to
the  Company's  participation, accrue  directly to  the contractholders  (net of
fees)  and,  therefore,  are  not  included  in  the  Company's  statements   of
operations.
 
RESULTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                                               1995       1994       1993
                                                                                             ---------  ---------  ---------
                                                                                                     $ IN THOUSANDS
<S>                                                                                          <C>        <C>        <C>
Net investment income......................................................................  $   3,996  $   2,017  $     753
                                                                                             ---------  ---------  ---------
Realized capital gains (losses), after tax.................................................  $     298  $  --      $      54
                                                                                             ---------  ---------  ---------
Net income.................................................................................  $   2,879  $   1,294  $     529
                                                                                             ---------  ---------  ---------
Fixed income securities, at amortized cost.................................................  $  44,112  $  51,527  $   9,543
                                                                                             ---------  ---------  ---------
</TABLE>
 
    Net  investment income increased  $2.0 million in 1995,  and $1.3 million in
1994. In both years,  the increases were attributable  to an increased level  of
investments,  including  the Company's  participation  in the  Separate Accounts
during 1995, and a $40 million capital contribution received from Allstate  Life
in  the third  quarter of 1994.  Net income  increases of $1.6  million and $0.8
million reflect the change in net investment income in both years.
 
    Realized capital gains after tax of $0.3 million in 1995 were the result  of
sales  of  investments  to  fund the  Company's  participation  in  the Separate
Accounts.
 
FINANCIAL POSITION
 
<TABLE>
<CAPTION>
                                                                                                      1995       1994
                                                                                                   ----------  ---------
                                                                                                      $ IN THOUSANDS
<S>                                                                                                <C>         <C>
Fixed income securities, at fair value...........................................................  $   48,815  $  49,807
                                                                                                   ----------  ---------
Unrealized net capital gains (losses) (1)........................................................  $    5,164  $  (1,720)
                                                                                                   ----------  ---------
Separate Account assets, at fair value...........................................................  $   15,578  $  --
                                                                                                   ----------  ---------
Contractholder funds.............................................................................  $1,340,925  $ 696,854
                                                                                                   ----------  ---------
Reinsurance recoverable from Allstate Life.......................................................  $1,340,925  $ 696,854
                                                                                                   ----------  ---------
</TABLE>
 
- -----------------
(1) Unrealized net capital gains (losses) exclude the effect of deferred  income
    taxes.
 
    Fixed  income securities are classified as available for sale and carried in
the statements  of  financial  position  at fair  value.  Although  the  Company
generally  intends to hold  its fixed income securities  for the long-term, such
classification affords  the Company  flexibility in  managing the  portfolio  in
response to changes in market conditions.
 
    At  December 31, 1995 unrealized capital gains were $5.2 million compared to
unrealized capital losses of $1.7 million at December 31, 1994. The  significant
change in the unrealized capital gain/loss position is primarily attributable to
declining interest rates.
 
    At  December 31, 1995 both contractholder funds and amounts recoverable from
Allstate Life under reinsurance  treaties reflect an  increase of $644  million.
These  increases result from sales of  the Company's single and flexible premium
deferred annuities partially offset by surrenders. Reinsurance recoverable  from
Allstate Life relates to policy benefit obligations ceded to Allstate Life.
 
    The  Company's participation  in the Separate  Accounts of  $10.5 million at
December 31, 1995 is  included in the Separate  Accounts assets. Unrealized  net
capital  gains arising from the Company's participation in the Separate Accounts
was $0.3 million, net of tax, at December 31, 1995.
 
                                       22
<PAGE>
LIQUIDITY AND CAPITAL RESOURCES
 
    Allstate Life made a $40 million capital contribution to the Company in  the
third quarter of 1994.
 
    Under  the  terms  of  intercompany reinsurance  agreements,  assets  of the
Company that relate to  insurance in force,  excluding Separate Account  assets,
are  transferred to Allstate  Life or other  reinsurers, who maintain investment
portfolios which support the Company's products.
 
                                  COMPETITION
 
    The Company is engaged in a  business that is highly competitive because  of
the large number of stock and mutual life insurance companies and other entities
competing  in the sale of insurance and annuities. There are approximately 2,000
stock, mutual and  other types  of insurers in  business in  the United  States.
Several   independent   rating  agencies   regularly  evaluate   life  insurer's
claims-paying ability, quality of investments  and overall stability. A.M.  Best
Company assigns A+ (Superior) to Allstate Life which automatically reinsures all
net  business of  the Company.  A.M. Best Company  also assigns  the Company the
rating of A+(r) because  the Company automatically  reinsures all business  with
Allstate   Life.  Standard  &  Poor's  Insurance  Rating  Services  assigns  AA+
(Excellent) to the Company's  claims-paying ability and  Moody's assigns an  Aa3
(Excellent)  financial stability rating  to the Company.  The Company shares the
same ratings of its  parent, Allstate Life Insurance  Company. These ratings  do
not relate to the investment performance of the Variable Account.
 
                                   EMPLOYEES
 
    As   of  December  31,   1995,  Glenbrook  Life   and  Annuity  Company  had
approximately 43 employees at its Home Office in Northbrook, Illinois.
 
                                   PROPERTIES
 
    The Company occupies office space provided by its parent, Allstate Life,  in
Northbrook,  Illinois. Expenses associated with these offices are allocated on a
direct and indirect basis to the Company.
 
                          STATE AND FEDERAL REGULATION
 
    The insurance  business  of the  Company  is subject  to  comprehensive  and
detailed  regulation and supervision  throughout the United  States. The laws of
the  various   jurisdictions   establish   supervisory   agencies   with   broad
administrative powers with respect to licensing to transact business, overseeing
trade  practices, licensing agents, approving policy forms, establishing reserve
requirements, fixing maximum interest rates  on life insurance policy loans  and
minimum  rates for  accumulation of surrender  values, prescribing  the form and
content of required financial statements and regulating the type and amounts  of
investments  permitted.  Each insurance  company  is required  to  file detailed
annual reports with supervisory agencies in  each of the jurisdictions in  which
it  does business and its operations and  accounts are subject to examination by
such agencies at regular intervals.
 
    Under insurance guaranty fund law,  in most states, insurers doing  business
therein  can  be assessed  up  to prescribed  limits  for contract  owner losses
incurred as  a  result  of  company  insolvencies.  The  amount  of  any  future
assessments on the Company under these laws cannot be reasonably estimated. Most
of these laws do provide, however, that an assessment may be excused or deferred
if it would threaten an insurer's own financial strength.
 
    In  addition, several states, including Illinois, regulate affiliated groups
of insurers, such  as the Company  and its affiliates,  under insurance  holding
company  legislation.  Under such  laws,  intercompany transfers  of  assets and
dividend payments from insurance subsidiaries may be subject to prior notice  or
approval,  depending on the size  of such transfers and  payments in relation to
the financial positions of the companies.
 
    Although the federal  government generally  does not  directly regulate  the
business  of insurance, federal initiatives often have an impact on the business
in  a  variety  of  ways.  Current  and  proposed  federal  measures  which  may
significantly affect the insurance business include employee benefit regulation,
controls  on  medical  care costs,  removal  of barriers  preventing  banks from
engaging in the securities and insurance business, tax law changes affecting the
taxation of insurance companies, the tax treatment of insurance products and its
impact on the relative desirability of various personal investment vehicles, and
proposed legislation to prohibit the use of gender in determining insurance  and
pension rates and benefits.
 
                EXECUTIVE OFFICERS AND DIRECTORS OF THE COMPANY
 
    The  directors  and  executive  officers  are  listed  below,  together with
information  as  to  their  ages,  dates  of  election  and  principal  business
occupations  during the  last five years  (if other than  their present business
occupations).
 
LOUIS G. LOWER, II, 50, Chief Executive Officer (1995)* and Chairman of the
Board (1992)*
 
    He is also President and Chairman of the Board of Directors of Allstate Life
Insurance Company, Northbrook Life  Insurance Company, Glenbrook Life  Insurance
Company,  The Northbrook Corporation and Allstate  Life Insurance Company of New
York; Chairman of the Board of  Directors and Chief Executive Officer of  Surety
Life  Insurance Company and Lincoln Benefit  Life Company; Chairman of the Board
of Directors  of  Allstate  Settlement Corporation;  Director  and  Senior  Vice
President  of  Allstate  Insurance  Company;  Vice  President  of  the  Allstate
 
                                       23
<PAGE>
Foundation; and Director  of Allstate  Life Financial  Services, Inc.,  Allstate
Indemnity  Company, Allstate Property and  Casualty Insurance Company, Deerbrook
Insurance Company, Northbrook Indemnity  Company, Northbrook National  Insurance
Company,   Northbrook   Property  and   Casualty  Insurance   Company,  Allstate
International, Inc. and Saison  Life Insurance Company, Ltd.  Prior to 1990,  he
was  Executive Vice President  of Allstate Life Insurance  Company. From 1992 to
1995, in  addition  to his  position  as Chairman  of  the Board,  he  was  also
President of the Company.
 
MARLA G. FRIEDMAN, 42, President, Chief Operating Officer (1995)* and Director
(1992)*
 
    She  is also Vice President and Director of Allstate Life Insurance Company,
Northbrook Life  Insurance Company,  Glenbrook Life  Insurance Company  and  The
Northbrook  Corporation;  and Director  of  Allstate Settlement  Corporation and
Allstate Life Financial Services, Inc. Prior to 1995, she was Vice President and
Director of Glenbrook Life and Annuity Company  and prior to 1992, she was  Vice
President  and Director of  Allstate Life Insurance  Company and Northbrook Life
Insurance Company. Prior to 1995, she was also Vice President of the Company.
 
MICHAEL J. VELOTTA, 50, Vice President, Secretary, General Counsel, and Director
(1993)*
 
    He is  also  Vice President,  Secretary,  General Counsel  and  Director  of
Allstate  Life Insurance  Company, Northbrook Life  Insurance Company, Glenbrook
Life Insurance  Company  and  Allstate  Life  Insurance  Company  of  New  York;
Secretary  and  Director  of  Allstate  Settlement  Corporation,  Allstate  Life
Financial Services, Inc. and The Northbrook Corporation; and Director of  Surety
Life  Insurance Company and Lincoln Benefit Life  Company. Prior to 1993, he was
Vice President and Assistant General Counsel of Allstate Insurance Company.
 
PETER H. HECKMAN, 50, Vice President and Director (1992)*
 
    He is also Vice President and  Director of Allstate Life Insurance  Company,
Northbrook  Life Insurance  Company, Glenbrook Life  Insurance Company, Allstate
Settlement Corporation and  Allstate Life  Insurance Company of  New York;  Vice
President  and Controller of The Northbrook  Corporation; and Director of Surety
Life Insurance Company and Lincoln Benefit  Life Company. Prior to 1992, he  was
Vice  President and Director of Allstate Life Insurance Company, Northbrook Life
Insurance Company, Glenbrook Life Insurance Company and Allstate Life  Insurance
Company of New York.
 
G. CRAIG WHITEHEAD, 50, Senior Vice President and Director (1995)*
 
    He is also Assistant Vice President and Director of Glenbrook Life Insurance
Company  and Assistant Vice President of  Allstate Life Insurance Company. Prior
to 1992, he was an Assistant Vice President of Glenbrook Life Insurance  Company
and  Allstate Life Insurance Company and prior to 1991, he was a director in the
strategic planning area of Allstate Insurance Company.
 
BARRY S. PAUL, 40, Assistant Vice President and Controller (1992)*
 
    He is  also  Assistant  Vice  President  and  Controller  of  Allstate  Life
Insurance  Company, Northbrook  Life Insurance Company,  Allstate Life Insurance
Company of New York and Glenbrook Life Insurance Company. Prior to 1991, he  was
Assistant  Vice President  of Allstate  Life Insurance  Company, Northbrook Life
Insurance Company and Allstate Life Insurance Company of New York.
 
JAMES P. ZILS, 44, Treasurer (1995)*
 
    He is also  Treasurer of  Allstate Life Financial  Services, Inc.,  Allstate
Settlement Corporation, Allstate Life Insurance Company, Allstate Life Insurance
Company of New York, Northbrook Life Insurance Company, Glenbrook Life Insurance
Company,  The Northbrook Corporation. He is  Treasurer and Vice President of AEI
Group, Inc.,  Allstate International  Inc., Allstate  Motor Club,  Inc.,  Direct
Marketing   Center,  Inc.,   Enterprises  Services   Corporation,  The  Allstate
Foundation, Forestview Mortgage Insurance  Company, Allstate Indemnity  Company,
Allstate  Property and  Casualty, Deerbrook  Insurance Company,  First Assurance
Company, Northbrook Indemnity  Company, Northbrook  National Insurance  Company,
Northbrook  Property and Casualty  Insurance Company. Prior to  1995 he was Vice
President of Allstate  Life Insurance  Company. Prior  to 1993  he held  various
management positions.
 
CASEY J. SYLLA, 52, Chief Investment Officer (1995)*
 
    He  is  also  Director  of Allstate  Insurance  Company,  Allstate Indemnity
Company, Allstate Property and  Casualty Insurance Company, Deerbrook  Insurance
Company,  First Assurance Company, Northbrook Indemnity Company, Northbrook Life
Insurance Company, Northbrook  National Insurance  Company, Northbrook  Property
and  Casualty Insurance Company. He is also Chief Investment Officer of Allstate
Settlement Corporation, The Northbrook Corporation, Allstate Insurance  Company,
Allstate  Indemnity Company, Allstate Property and Casualty, Deerbrook Insurance
Company, First  Assurance  Company,  Northbrook  Indemnity  Company,  Northbrook
National  Insurance Company, Northbrook Property and Casualty Insurance Company.
He is also  Director and  Chief Investment  Officer of  Allstate Life  Insurance
Company.  Prior  to 1995,  he was  Senior Vice  President and  Executive Officer
Investments for Northwestern Mutual Life Insurance Company.
 
* Date elected/appointed to current office.
 
                             EXECUTIVE COMPENSATION
 
    Executive officers of the  Company also serve as  officers of Allstate  Life
and receive no compensation directly from the Company. Some of the officers also
serve  as officers of  other companies affiliated  with the Company. Allocations
have been made as to each individual's time  devoted to his or her duties as  an
executive  officer of the Company.  However, no officer's compensation allocated
to the Company exceeded
 
                                       24
<PAGE>
$100,000. The allocated cash  compensation of all officers  of the Company as  a
group  for  services  rendered in  all  capacities  to the  Company  during 1995
totalled $5,976.86. Directors of the Company receive no compensation in addition
to their compensation as employees of the Company.
 
SUMMARY COMPENSATION TABLE
(ALLSTATE LIFE INSURANCE CO.)
<TABLE>
<CAPTION>
                                                      ANNUAL COMPENSATION                                          LONG TERM
                                                                                                                  COMPENSATION
                                                                                                                  -----------
                                                                                                              AWARDS
                                                                                                     ------------------------
                                                                                                                      (G)
                                             -------------------------------------                       (F)      SECURITIES
                                                                                          (E)        RESTRICTED   UNDERLYING
                    (A)                          (B)          (C)          (D)       OTHER ANNUAL       STOCK      OPTIONS/
NAME AND PRINCIPAL POSITION                     YEAR       SALARY($)    BONUS($)     COMPENSATION     AWARD(S)      SARS(#)
- -------------------------------------------      ---      -----------  -----------  ---------------  -----------  -----------
<S>                                          <C>          <C>          <C>          <C>              <C>          <C>
Louis G. Lower, II.........................        1995    $ 416,000    $ 266,175      $  17,044      $ 199,890          N/A
Chief Executive Officer and                        1994    $ 389,050    $  43,973      $  26,990      $ 170,660          N/A
Chairman of the Board of Directors                 1993    $ 374,200    $ 294,683      $  52,443      $ 318,625          N/A
 
<CAPTION>
 
                                                       PAYOUTS
                                             ----------------------------
                                                                (I)
                                                 (H)         ALL OTHER
                    (A)                         LTIP       COMPENSATION
NAME AND PRINCIPAL POSITION                  PAYOUTS ($)        ($)
- -------------------------------------------  -----------  ---------------
<S>                                          <C>          <C>
Louis G. Lower, II.........................   $ 411,122     $   5,250(1)
Chief Executive Officer and                           0     $   1,890(1)
Chairman of the Board of Directors            $  13,451     $   6,296(1)
</TABLE>
 
- ------------
 
(1) Amount received  by Mr. Lower  which represents the  value allocated to  his
    account from employer contributions under the Profit Sharing Fund and to its
    predecessor, The Savings and Profit Sharing Fund of Sears employees.
 
    Shares  of  the Company  and Allstate  Life  are not  directly owned  by any
director or officer  of the Company.  The percentage of  shares of The  Allstate
Corporation  beneficially  owned  by  any director,  and  by  all  directors and
officers of the Company  as a group,  does not exceed one  percent of the  class
outstanding.
 
                               LEGAL PROCEEDINGS
 
    From  time  to  time  the  Company is  involved  in  pending  and threatened
litigation in the  normal course of  its business in  which claims for  monetary
damages  are asserted. Management,  after consultation with  legal counsel, does
not anticipate the ultimate  liability arising from  such pending or  threatened
litigation to have a material effect on the financial condition of the Company.
 
                                    EXPERTS
 
    The  financial statements of the  Variable Account incorporated by reference
in this  prospectus,  and  the  financial  statements  and  financial  statement
schedule  of  the  Company included  in  this  prospectus have  been  audited by
Deloitte & Touche LLP, Two Prudential Plaza, 180 North Stetson Avenue,  Chicago,
IL 60601-6799, independent auditors, as stated in their reports appearing herein
and  incorporated by reference in this  prospectus, and are included in reliance
upon the  reports  of  such  firm  given upon  their  authority  as  experts  in
accounting and auditing.
 
                                 LEGAL MATTERS
 
    Sutherland,  Asbill and Brennan  of Washington, D.C.  has provided advice on
certain legal matters relating to the federal securities laws applicable to  the
issue  and sale of the Contracts. All  matters of Illinois law pertaining to the
Contracts, including the validity  of the Contracts and  the Company's right  to
issue  such Contracts  under Illinois  insurance law,  have been  passed upon by
Michael J. Velotta, General Counsel of the Company.
 
                                       25
<PAGE>
                                  [LETTERHEAD]
 
                          INDEPENDENT AUDITORS' REPORT
 
TO THE BOARD OF DIRECTORS AND SHAREHOLDER OF
GLENBROOK LIFE AND ANNUITY COMPANY:
 
    We  have  audited  the  accompanying  Statements  of  Financial  Position of
Glenbrook Life and Annuity  Company as of  December 31, 1995  and 1994, and  the
related  Statements of Operations, Shareholder's Equity  and Cash Flows for each
of the  three years  in the  period ended  December 31,  1995. Our  audits  also
included  Schedule IV --  Reinsurance. These financial  statements and financial
statement schedule  are  the responsibility  of  the Company's  management.  Our
responsibility  is  to  express an  opinion  on these  financial  statements and
financial statement schedule based on our audits.
 
    We conducted  our  audits in  accordance  with generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence  supporting
the  amounts and disclosures in the financial statements. An audit also includes
assessing the  accounting  principles used  and  significant estimates  made  by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In our opinion, such  financial statements present  fairly, in all  material
respects,  the financial  position of Glenbrook  Life and Annuity  Company as of
December 31, 1995 and 1994, and the results of its operations and its cash flows
for each of the three years in the period ended December 31, 1995 in  conformity
with generally accepted accounting principles. Also, in our opinion, Schedule IV
- --  Reinsurance, when considered  in relation to  the basic financial statements
taken as a whole, presents fairly, in all material respects, the information set
forth therein.
 
    As discussed in  Note 3  to the financial  statements, in  1993 the  Company
changed its method of accounting for investments in fixed income securities.
 
/s/ DELOITTE & TOUCHE LLP
 
Chicago, Illinois
March 1, 1996
 
                                      F-1
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
                        STATEMENTS OF FINANCIAL POSITION
 
<TABLE>
<CAPTION>
                                                                                                       DECEMBER 31,
                                                                                                   ---------------------
                                                                                                      1995       1994
                                                                                                   ----------  ---------
                                                                                                     ($ IN THOUSANDS)
<S>                                                                                                <C>         <C>
Assets
  Investments
    Fixed income securities
      Available for sale, at fair value (amortized cost $44,112 and $51,527).....................  $   48,815  $  49,807
    Short-term...................................................................................       2,102        924
                                                                                                   ----------  ---------
        Total investments........................................................................      50,917     50,731
    Reinsurance recoverable from Allstate Life Insurance Company.................................   1,340,925    696,854
    Cash.........................................................................................         264
    Deferred income taxes........................................................................                    542
    Other assets.................................................................................       2,021      2,118
    Separate Accounts............................................................................      15,578
                                                                                                   ----------  ---------
        Total assets.............................................................................  $1,409,705  $ 750,245
                                                                                                   ----------  ---------
                                                                                                   ----------  ---------
Liabilities
  Contractholder funds...........................................................................  $1,340,925  $ 696,854
  Income taxes payable...........................................................................       1,637        605
  Deferred income taxes..........................................................................       1,828
  Net payable to Allstate Life Insurance Company.................................................         255        128
  Separate Accounts..............................................................................       5,048
                                                                                                   ----------  ---------
        Total liabilities........................................................................   1,349,693    697,587
                                                                                                   ----------  ---------
Shareholder's equity
  Common stock ($500 par value, 4,200 shares authorized, issued, and outstanding)................       2,100      2,100
  Additional capital paid-in.....................................................................      49,641     49,641
  Unrealized net capital gains (losses)..........................................................       3,357     (1,118)
  Retained income................................................................................       4,914      2,035
                                                                                                   ----------  ---------
        Total shareholder's equity...............................................................      60,012     52,658
                                                                                                   ----------  ---------
        Total liabilities and shareholder's equity...............................................  $1,409,705  $ 750,245
                                                                                                   ----------  ---------
                                                                                                   ----------  ---------
</TABLE>
 
                            STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                                                  YEAR ENDED DECEMBER 31,
                                                                                              -------------------------------
                                                                                                1995       1994       1993
                                                                                              ---------  ---------  ---------
                                                                                                     ($ IN THOUSANDS)
<S>                                                                                           <C>        <C>        <C>
Revenues
  Net investment income.....................................................................  $   3,996  $   2,017  $     753
  Realized capital gains (losses)...........................................................        459                    83
                                                                                              ---------  ---------        ---
Income before income taxes..................................................................      4,455      2,017        836
Income tax expense..........................................................................      1,576        723        307
                                                                                              ---------  ---------        ---
Net income..................................................................................  $   2,879  $   1,294  $     529
                                                                                              ---------  ---------        ---
                                                                                              ---------  ---------        ---
</TABLE>
 
                       See notes to financial statements.
 
                                      F-2
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
                       STATEMENTS OF SHAREHOLDER'S EQUITY
 
<TABLE>
<CAPTION>
                                                                            ADDITIONAL   UNREALIZED NET
                                                                 COMMON       CAPITAL     CAPITAL GAINS    RETAINED
                                                                  STOCK       PAID-IN       (LOSSES)        INCOME       TOTAL
                                                               -----------  -----------  ---------------  -----------  ---------
                                                                                       ($ IN THOUSANDS)
<S>                                                            <C>          <C>          <C>              <C>          <C>
Balance, December 31, 1992...................................   $   2,100    $   9,641      $     (10)     $     212   $  11,943
  Net income.................................................                                                    529         529
  Change in unrealized net capital gains and losses..........                                     703                        703
                                                                    -----   -----------        ------          -----   ---------
Balance, December 31, 1993...................................       2,100        9,641            693            741      13,175
  Net income.................................................                                                  1,294       1,294
  Capital contribution.......................................                   40,000                                    40,000
  Change in unrealized net capital gains and losses..........                                  (1,811)                    (1,811)
                                                                    -----   -----------        ------          -----   ---------
Balance, December 31, 1994...................................       2,100       49,641         (1,118)         2,035      52,658
  Net income.................................................                                                  2,879       2,879
  Change in unrealized net capital gains and losses..........                                   4,475                      4,475
                                                                    -----   -----------        ------          -----   ---------
Balance, December 31, 1995...................................   $   2,100    $  49,641      $   3,357      $   4,914   $  60,012
                                                                    -----   -----------        ------          -----   ---------
                                                                    -----   -----------        ------          -----   ---------
</TABLE>
 
                            STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                                             YEAR ENDED DECEMBER 31,
                                                                                         -------------------------------
                                                                                           1995       1994       1993
                                                                                         ---------  ---------  ---------
                                                                                                ($ IN THOUSANDS)
<S>                                                                                      <C>        <C>        <C>
Cash flows from operating activities
  Net income...........................................................................  $   2,879  $   1,294  $     529
  Adjustments to reconcile net income to net cash from operating activities
    Deferred income taxes..............................................................        (39)
    Realized capital gains.............................................................       (459)                  (83)
    Changes in other operating assets and liabilities..................................      1,217       (180)       656
                                                                                         ---------  ---------  ---------
      Net cash from operating activities...............................................      3,598      1,114      1,102
                                                                                         ---------  ---------  ---------
Cash flows from investing activities
  Fixed income securities available for sale
    Proceeds from sales................................................................      7,836                 3,015
    Investment collections.............................................................      1,568        649        969
    Investment purchases...............................................................     (1,491)   (42,729)    (3,737)
  Participation in Separate Account....................................................    (10,069)
  Change in short-term investments, net................................................     (1,178)       667     (1,102)
                                                                                         ---------  ---------  ---------
      Net cash from investing activities...............................................     (3,334)   (41,413)      (855)
                                                                                         ---------  ---------  ---------
Cash flows from financing activities
  Capital contribution.................................................................                40,000
                                                                                         ---------  ---------  ---------
      Net cash from financing activities...............................................     --         40,000     --
                                                                                         ---------  ---------  ---------
Net increase (decrease) in cash........................................................        264       (299)       247
Cash at beginning of year..............................................................     --            299         52
                                                                                         ---------  ---------  ---------
Cash at end of year....................................................................  $     264  $  --      $     299
                                                                                         ---------  ---------  ---------
                                                                                         ---------  ---------  ---------
</TABLE>
 
                       See notes to financial statements.
 
                                      F-3
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS
                                ($ IN THOUSANDS)
 
1.  ORGANIZATION AND NATURE OF OPERATIONS
    Glenbrook  Life  and  Annuity Company  (the  "Company") is  wholly  owned by
Allstate Life  Insurance Company  ("Allstate Life"),  which is  wholly owned  by
Allstate  Insurance  Company  ("Allstate"),  a  wholly-owned  subsidiary  of The
Allstate Corporation (the "Corporation"). On  June 30, 1995, Sears, Roebuck  and
Co. ("Sears") distributed its 80.3% ownership in the Corporation to Sears common
shareholders through a tax-free dividend (the "Distribution").
 
    The  Company develops and markets flexible premium deferred variable annuity
contracts and  single and  flexible premium  deferred annuities  to  individuals
through banks and financial institutions in the United States.
 
    Annuity  contracts  issued  by  the  Company  are  subject  to discretionary
withdrawal or surrender by the  contractholder, subject to applicable  surrender
charges. These contracts are reinsured with Allstate Life (Note 4) which selects
assets   to  meet  the  anticipated  cash   flow  requirements  of  the  assumed
liabilities. Allstate Life utilizes various modeling techniques in managing  the
relationship  between assets and liabilities  and employs strategies to maintain
investments which are sufficiently liquid to meet obligations to contractholders
in various interest rate scenarios.
 
    The Company monitors  economic and  regulatory developments  which have  the
potential  to impact its business. Currently there is proposed legislation which
would permit banks greater participation  in securities businesses, which  could
eventually  present an increased level of competition for sales of the Company's
annuity contracts. Furthermore, the federal  government may enact changes  which
could  possibly eliminate  the tax-advantaged  nature of  annuities or eliminate
consumers' need for tax deferral,  thereby reducing the incentive for  customers
to  purchase the  Company's products.  While it is  not possible  to predict the
outcome of such issues  with certainty, management  evaluates the likelihood  of
various  outcomes and  develops strategies, as  appropriate, to  respond to such
challenges.
 
    Certain reclassifications  have  been  made  to  the  prior  year  financial
statements to conform to the presentation for the current year.
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
LIFE INSURANCE ACCOUNTING
 
    The  Company sells long-duration  contracts that do  not involve significant
risk of policyholder  mortality or  morbidity (principally  single and  flexible
premium annuities) which are considered investment contracts.
 
CONTRACTHOLDER FUNDS
 
    Contractholder  funds  arise  from  the  issuance  of  individual  and group
annuities that include an investment  component. Payments received are  recorded
as  interest-bearing  liabilities. Contractholder  funds  are equal  to deposits
received and  interest  accrued  to  the  benefit  of  the  contractholder  less
withdrawals,  mortality charges  and administrative  expenses. Credited interest
rates on contractholder funds ranged from 3.0% to 7.4% for those contracts  with
fixed interest rates and from 4.25% to 7.9% for those with flexible rates during
1995.
 
SEPARATE ACCOUNTS
 
    During  1995, the Company issued  flexible premium deferred variable annuity
contracts, the  assets  and liabilities  of  which are  legally  segregated  and
reflected  in the  accompanying statements of  financial position  as assets and
liabilities of  the  Separate  Accounts  (Glenbrook  Life  and  Annuity  Company
Variable Annuity Account and Glenbrook Life and Annuity Company Separate Account
A),   unit  investment  trusts  registered  with  the  Securities  and  Exchange
Commission. Assets of the Separate Accounts are invested in funds of  management
investment  companies. For certain  variable annuity contracts,  the Company has
entered into an exclusive distribution arrangement with distributors.
 
    The assets of the  Separate Accounts are carried  at fair value.  Unrealized
gains  and losses on the Company's participation in the Separate Account, net of
deferred income taxes,  is shown  as a  component of  shareholder's equity.  The
Company's  participation  in  the  Separate  Account,  amounting  to  $10,530 at
December 31,  1995, is  subject  to certain  withdrawal restrictions  which  are
dependent  upon aggregate fund net asset  values. In addition, limitations exist
with regard to the maximum amount which  can be withdrawn by the Company  within
any 30-day period.
 
    Investment  income and realized  gains and losses  of the Separate Accounts,
other than the portion related  to the Company's participation, accrue  directly
to  the contractholders  and, therefore,  are not  included in  the accompanying
statements of operations.  Revenues to  the Company from  the Separate  Accounts
consist  of  contract maintenance  fees, administrative  fees and  mortality and
expense risk charges, which are entirely ceded to Allstate Life.
 
                                      F-4
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS
                                ($ IN THOUSANDS)
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
REINSURANCE
 
    Beginning June 5, 1992, the Company  reinsures all new business to  Allstate
Life  (Note  4).  Life  insurance  in  force prior  to  that  date  is  ceded to
non-affiliated reinsurers.
 
    Contract charges and credited interest are  ceded and reflected net of  such
cessions   in  the   statements  of  operations.   Reinsurance  recoverable  and
contractholder funds  are reported  separately in  the statements  of  financial
position.
 
INVESTMENTS
 
    Fixed  income securities include bonds and mortgage-backed securities. Fixed
income securities are carried  at fair value.  The difference between  amortized
cost  and fair value, net  of deferred income taxes,  is reflected as a separate
component of  shareholder's  equity.  Provisions  are made  to  write  down  the
carrying  value of fixed income securities for  declines in value that are other
than temporary.  Such writedowns  are  included in  realized capital  gains  and
losses.
 
    Short-term investments are carried at cost which approximates fair value.
 
    Investment  income consists primarily of interest, which is recognized on an
accrual basis. Interest  income on mortgage-backed  securities is determined  on
the effective yield method, based on the estimated principal repayments. Accrual
of  income is suspended for fixed income  securities that are in default or when
the receipt of interest payments is in doubt. Realized capital gains and  losses
are determined on a specific identification basis.
 
INCOME TAXES
 
    The  income tax provision is calculated under the liability method. Deferred
tax assets and  liabilities are  recorded based  on the  difference between  the
financial  statement and tax bases of assets and liabilities and the enacted tax
rates. Deferred income taxes also arise from unrealized capital gains or  losses
on fixed income securities carried at fair value.
 
USE OF ESTIMATES
 
    The  preparation  of  financial  statements  in  conformity  with  generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that affect  the amounts reported  in the  financial statements and
accompanying notes. Actual results could differ from those estimates.
 
3.  ACCOUNTING CHANGE
    Effective December  31, 1993,  the Company  adopted Statement  of  Financial
Accounting  Standards ("SFAS") No.  115, "Accounting for  Certain Investments in
Debt and Equity Securities." SFAS  No. 115 requires that investments  classified
as  available  for  sale be  carried  at  fair value.  Previously,  fixed income
securities classified  as  available for  sale  were  carried at  the  lower  of
amortized  cost or fair  value, determined in  the aggregate. Unrealized holding
gains and losses are reflected as a separate component of shareholder's  equity,
net  of deferred  income taxes.  The net  effect of  adoption of  this statement
increased shareholder's equity at December 31,  1993 by $693, with no impact  on
net income.
 
4.  RELATED PARTY TRANSACTIONS
REINSURANCE
 
    Contract  charges ceded to  Allstate Life under  reinsurance agreements were
$1,523 and $409 in 1995 and  1994, respectively. Credited interest and  expenses
ceded  to  Allstate Life  amounted  to $71,905  and  $26,177 in  1995  and 1994,
respectively.  Investment   income   earned   on  the   assets   which   support
contractholder  funds is not  included in the  Company's financial statements as
those assets were transferred  to Allstate Life under  the terms of  reinsurance
treaties.  Reinsurance ceded  arrangements do not  discharge the  Company as the
primary insurer.
 
BUSINESS OPERATIONS
 
    The Company utilizes services and  business facilities owned or leased,  and
operated  by  Allstate  in  conducting  its  business  activities.  The  Company
reimburses Allstate for the operating expenses incurred by Allstate on behalf of
the Company. The cost to the Company is determined by various allocation methods
and is primarily related to the level of services provided. Operating  expenses,
including  compensation and retirement and  other benefit programs, allocated to
the Company  were $348,  $271 and  $59  in 1995,  1994 and  1993,  respectively.
Investment-related  expenses are  retained by the  Company. All  other costs are
assumed by Allstate Life under reinsurance treaties.
 
                                      F-5
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS
                                ($ IN THOUSANDS)
 
4.  RELATED PARTY TRANSACTIONS (CONTINUED)
LAUGHLIN GROUP
 
    Laughlin Group,  Inc. ("Laughlin"),  a wholly-owned  subsidiary of  Laughlin
Group  Holdings  Inc.,  a wholly-owned  subsidiary  of Allstate  Life  which was
acquired in  September 1995,  is a  third-party marketer  which distributes  the
products  of  insurance carriers  including  the Company.  Laughlin  markets the
Company's flexible  premium deferred  variable  annuity contracts  and  flexible
premium deferred annuities. Sales commissions paid to Laughlin subsequent to the
acquisition date of $3,439 were ceded to Allstate Life.
 
5.  INCOME TAXES
    Allstate  Life and its  life insurance subsidiaries,  including the Company,
will file a consolidated federal income tax return. Tax liabilities and benefits
realized by the consolidated group are allocated as generated by the  respective
subsidiaries,  whether or not such benefits  generated by the subsidiaries would
be available  on a  separate  return basis.  The  Corporation and  its  domestic
subsidiaries  including the Company (the "Allstate  Group"), will be eligible to
file a consolidated tax return beginning in the year 2000.
 
    Prior to the  Distribution, the  Allstate Group  joined with  Sears and  its
domestic  business units  (the "Sears  Group") in  the filing  of a consolidated
federal income tax return (the "Sears Tax Group") and were parties to a  federal
income  tax allocation agreement  (the "Tax Sharing Agreement").  As a member of
the Sears Tax Group,  the Corporation was jointly  and severally liable for  the
consolidated  income tax liability of the Sears Tax Group. Under the Tax Sharing
Agreement, the Company, through  the Corporation, paid to  or received from  the
Sears  Group the amount, if  any, by which the  Sears Tax Group's federal income
tax liability was affected by virtue of  inclusion of the Allstate Group in  the
consolidated  federal  income  tax  return. Effectively,  this  resulted  in the
Company's annual income tax provision being  computed as if the Company filed  a
separate  return, except that items such as net operating losses, capital losses
or similar  items which  might not  be immediately  recognizable in  a  separate
return,  were allocated according to the  Tax Sharing Agreement and reflected in
the Company's provision  to the  extent that such  items reduced  the Sears  Tax
Group's federal tax liability.
 
    The  Allstate Group  and Sears  Group have  entered into  an agreement which
governs their respective rights and  obligations with respect to federal  income
taxes  for all periods prior to the Distribution ("Consolidated Tax Years"). The
agreement provides that all Consolidated Tax Years will continue to be  governed
by  the Tax Sharing Agreement  with respect to the  Company's federal income tax
liability and taxes payable to or recoverable from the Sears Group.
 
    The components of the deferred income tax assets and liabilities at December
31, 1995 and 1994 are as follows:
 
<TABLE>
<CAPTION>
                                                                                                         1995       1994
                                                                                                       ---------  ---------
<S>                                                                                                    <C>        <C>
Unrealized net capital losses on fixed income securities.............................................  $  --      $     602
Other................................................................................................                     4
                                                                                                       ---------  ---------
  Total deferred assets..............................................................................     --            606
                                                                                                       ---------  ---------
                                                                                                       ---------  ---------
Unrealized net capital gains on fixed income securities..............................................  $  (1,807)
Difference in tax bases of investments...............................................................        (21)
Other................................................................................................                   (64)
                                                                                                       ---------  ---------
  Total deferred liabilities.........................................................................     (1,828)       (64)
                                                                                                       ---------  ---------
  Net deferred (liability) asset.....................................................................  $  (1,828) $     542
                                                                                                       ---------  ---------
                                                                                                       ---------  ---------
</TABLE>
 
    The components of income tax expense are as follows:
 
<TABLE>
<CAPTION>
                                                                                                  YEAR ENDED DECEMBER 31,
                                                                                              -------------------------------
                                                                                                1995       1994       1993
                                                                                              ---------  ---------  ---------
<S>                                                                                           <C>        <C>        <C>
Current.....................................................................................  $   1,615  $     652  $     290
Deferred....................................................................................        (39)        71         17
                                                                                              ---------        ---        ---
  Income tax expense........................................................................  $   1,576  $     723  $     307
                                                                                              ---------        ---        ---
                                                                                              ---------        ---        ---
</TABLE>
 
    The Company paid income taxes of $874, $57 and $290 in 1995, 1994 and  1993,
respectively,  under the  Tax Sharing  Agreement. The  Company had  income taxes
payable to Allstate  Life of  $1,637 and  $605 at  December 31,  1995 and  1994,
respectively.
 
                                      F-6
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS
                                ($ IN THOUSANDS)
 
6.  INVESTMENTS
 
FAIR VALUES
 
    The  amortized cost,  fair value and  gross unrealized gains  and losses for
fixed income securities are as follows:
 
<TABLE>
<CAPTION>
                                                                                                GROSS UNREALIZED
                                                                                  AMORTIZED   --------------------
                                                                                    COST        GAINS     LOSSES    FAIR VALUE
                                                                                 -----------  ---------  ---------  -----------
<S>                                                                              <C>          <C>        <C>        <C>
AT DECEMBER 31, 1995
U.S. government and agencies...................................................   $  24,722   $   3,470     --       $  28,192
Corporate......................................................................       1,304         120                  1,424
Mortgage-backed securities.....................................................      18,086       1,113                 19,199
                                                                                 -----------  ---------  ---------  -----------
  Totals.......................................................................   $  44,112   $   4,703     --       $  48,815
                                                                                 -----------  ---------  ---------  -----------
                                                                                 -----------  ---------  ---------  -----------
AT DECEMBER 31, 1994
U.S. government and agencies...................................................   $  31,005   $      30  $   1,126   $  29,909
Mortgage-backed securities.....................................................      20,522         624                 19,898
                                                                                 -----------  ---------  ---------  -----------
  Total........................................................................   $  51,527   $      30  $   1,750   $  49,807
                                                                                 -----------  ---------  ---------  -----------
                                                                                 -----------  ---------  ---------  -----------
</TABLE>
 
SCHEDULED MATURITIES
 
    The scheduled maturities of  fixed income securities  available for sale  at
December 31, 1995 are as follows:
 
<TABLE>
<CAPTION>
                                                                                                      AMORTIZED     FAIR
                                                                                                        COST        VALUE
                                                                                                     -----------  ---------
<S>                                                                                                  <C>          <C>
Due in one year or less............................................................................   $     398   $     403
Due after one year through five years..............................................................
Due after five years through ten years.............................................................      15,883      17,681
Due after ten years................................................................................       9,745      11,532
                                                                                                     -----------  ---------
                                                                                                         26,026      29,616
Mortgage-backed securities.........................................................................      18,086      19,199
                                                                                                     -----------  ---------
  Total............................................................................................   $  44,112   $  48,815
                                                                                                     -----------  ---------
                                                                                                     -----------  ---------
</TABLE>
 
    Actual maturities may differ from those scheduled as a result of prepayments
by the issuers.
 
UNREALIZED NET CAPITAL GAINS AND LOSSES
 
    Unrealized  net capital gains and losses  on fixed income securities and the
Company's participation in the Separate Account included in shareholder's equity
at December 31, 1995 are as follows:
 
<TABLE>
<CAPTION>
                                                                                                                UNREALIZED
                                                                                         AMORTIZED     FAIR     NET GAINS/
                                                                                           COST        VALUE     (LOSSES)
                                                                                        -----------  ---------  -----------
<S>                                                                                     <C>          <C>        <C>
Fixed income securities...............................................................   $  44,112   $  48,815   $   4,703
Participation in Separate Account.....................................................      10,069      10,530         461
Deferred income taxes.................................................................                              (1,807)
                                                                                                                -----------
  Total...............................................................................                           $   3,357
                                                                                                                -----------
                                                                                                                -----------
</TABLE>
 
                                      F-7
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS
                                ($ IN THOUSANDS)
 
6.  INVESTMENTS (CONTINUED)
    The change  in unrealized  net capital  gains and  losses for  fixed  income
securities  and  the  Company's  participation in  the  Separate  Account  is as
follows:
 
<TABLE>
<CAPTION>
                                                                                                  YEAR ENDED DECEMBER 31,
                                                                                              -------------------------------
                                                                                                1995       1994       1993
                                                                                              ---------  ---------  ---------
<S>                                                                                           <C>        <C>        <C>
Fixed income securities.....................................................................  $   6,423  $  (2,786) $   1,076
Participation in Separate Account in 1995...................................................                              461
Deferred income taxes.......................................................................     (2,409)       975       (373)
                                                                                              ---------  ---------  ---------
  Change in unrealized net capital gains and losses.........................................  $   4,475  $  (1,811) $     703
                                                                                              ---------  ---------  ---------
                                                                                              ---------  ---------  ---------
</TABLE>
 
COMPONENTS OF NET INVESTMENT INCOME
 
    Investment income by investment type is as follows:
 
<TABLE>
<CAPTION>
                                                                                                 YEAR ENDED DECEMBER 31,
                                                                                             -------------------------------
                                                                                               1995       1994       1993
                                                                                             ---------  ---------  ---------
<S>                                                                                          <C>        <C>        <C>
Investment income:
  Fixed income securities..................................................................  $   3,850  $   1,984  $     729
  Short-term...............................................................................        113         48         35
  Participation in Separate Account in 1995................................................                               69
                                                                                             ---------  ---------        ---
Investment income, before expense..........................................................      4,032      2,032        764
Investment expense.........................................................................         36         15         11
                                                                                             ---------  ---------        ---
Net investment income......................................................................  $   3,996  $   2,017  $     753
                                                                                             ---------  ---------        ---
                                                                                             ---------  ---------        ---
</TABLE>
 
REALIZED CAPITAL GAINS AND LOSSES
 
    Realized capital gains on investments are as follows:
 
<TABLE>
<CAPTION>
                                                                                                    YEAR ENDED DECEMBER 31,
                                                                                               ---------------------------------
                                                                                                 1995       1994        1993
                                                                                               ---------  ---------     -----
<S>                                                                                            <C>        <C>        <C>
Fixed income securities......................................................................  $     459  $  --       $      83
Income tax...................................................................................        161                     29
                                                                                                                             --
                                                                                                     ---  ---------
Net realized gains...........................................................................  $     298  $  --       $      54
                                                                                                                             --
                                                                                                                             --
                                                                                                     ---  ---------
                                                                                                     ---  ---------
</TABLE>
 
PROCEEDS FROM SALES OF FIXED INCOME SECURITIES
 
    The proceeds from sales of investments in fixed income securities, excluding
calls, were $7,836 and $3,015, with related gross realized gains of $459 and $22
for 1995 and 1993, respectively. There were no such amounts realized in 1994.
 
SECURITIES ON DEPOSIT
 
    At December  31, 1995,  fixed income  securities with  a carrying  value  of
$10,085 were on deposit with regulatory authorities as required by law.
 
7.  FINANCIAL INSTRUMENTS
    In  the normal course of business,  the Company invests in various financial
assets and incurs various financial liabilities. The fair value of all financial
assets other  than  fixed  income  securities and  all  liabilities  other  than
contractholder funds approximates their carrying value as they are short-term in
nature.
 
    Fair  values for fixed income securities  are based on quoted market prices.
The December 31, 1995 and 1994 fair  values and carrying values of fixed  income
securities are discussed in Note 6.
 
    The  fair value of contractholder funds  on investment contracts is based on
the terms of the underlying contracts. Reserves on investment contracts with  no
stated  maturities (single premium and  flexible premium deferred annuities) are
valued at the fund  balance less surrender charge.  The fair value of  immediate
annuities with fixed terms are estimated using discounted cash flow calculations
based on
 
                                      F-8
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS
                                ($ IN THOUSANDS)
 
7.  FINANCIAL INSTRUMENTS (CONTINUED)
interest  rates currently offered for contracts with similar terms and duration.
Contractholder funds on investment contracts had a carrying value of  $1,340,925
at December 31, 1995 and a fair value of $1,282,248. The carrying value and fair
value at December 31, 1994 were $696,854 and $670,930, respectively.
 
8.  STATUTORY FINANCIAL INFORMATION
    The  following  tables  reconcile  net income  and  shareholder's  equity as
reported herein in conformity with generally accepted accounting principles with
statutory net  income and  capital and  surplus, determined  in accordance  with
statutory  accounting practices prescribed or  permitted by insurance regulatory
authorities:
 
<TABLE>
<CAPTION>
                                                                                                           NET INCOME
                                                                                                           YEAR ENDED
                                                                                                          DECEMBER 31,
                                                                                                 -------------------------------
                                                                                                   1995       1994       1993
                                                                                                 ---------  ---------  ---------
<S>                                                                                              <C>        <C>        <C>
Balance per generally accepted accounting principles...........................................  $   2,879  $   1,294  $     529
  Income taxes.................................................................................       (164)        29          8
  Interest maintenance reserve.................................................................                   (53)        27
  Non-admitted assets and statutory reserves...................................................        (46)        15        (47)
                                                                                                 ---------  ---------        ---
Balance per statutory accounting practices.....................................................  $   2,669  $   1,285  $     517
                                                                                                 ---------  ---------        ---
                                                                                                 ---------  ---------        ---
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                   SHAREHOLDER'S EQUITY
                                                                                                       DECEMBER 31,
                                                                                                   --------------------
                                                                                                     1995       1994
                                                                                                   ---------  ---------
<S>                                                                                                <C>        <C>
Balance per generally accepted accounting principles.............................................  $  60,012  $  52,658
Income taxes.....................................................................................        698       (575)
Unrealized net capital gains (losses)............................................................     (4,703)     1,719
Non-admitted assets and statutory reserves.......................................................     (1,702)    (1,635)
                                                                                                   ---------  ---------
Balance per statutory accounting practices.......................................................  $  54,305  $  52,167
                                                                                                   ---------  ---------
                                                                                                   ---------  ---------
</TABLE>
 
PERMITTED STATUTORY ACCOUNTING PRACTICES
 
    The Company prepares their statutory financial statements in accordance with
accounting principles and  practices prescribed  or permitted  by the  insurance
department  of the State of  Illinois. Prescribed statutory accounting practices
include a  variety of  publications  of the  National Association  of  Insurance
Commissioners,  as well as  state laws, regulations,  and general administrative
rules.  Permitted  statutory  accounting  practices  encompass  all   accounting
practices not so prescribed. The Company does not follow any permitted statutory
accounting  practices  that  have  a material  effect  on  statutory  surplus or
risk-based capital.
 
DIVIDENDS
 
    The ability  of  the Company  to  pay  dividends is  dependent  on  business
conditions, income, cash requirements of the Company and other relevant factors.
The  payment of shareholder  dividends by insurance  companies without the prior
approval of the state insurance regulator is limited to formula amounts based on
net income  and capital  and surplus,  determined in  accordance with  statutory
accounting  practices, as well as the timing and amount of dividends paid in the
preceding twelve months. The  maximum amount of dividends  that the Company  can
distribute  during  1996  without  prior  approval  of  both  the  Illinois  and
California Departments of Insurance is $5,220.
 
                                      F-9
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
                           SCHEDULE IV -- REINSURANCE
                                ($ IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                 GROSS
                                                                                                AMOUNT       CEDED    NET AMOUNT
                                                                                              -----------  ---------  -----------
<S>                                                                                           <C>          <C>        <C>
YEAR ENDED DECEMBER 31, 1995
Life insurance in force.....................................................................   $   1,250   $   1,250   $  --
                                                                                                   -----   ---------       -----
                                                                                                   -----   ---------       -----
Premiums and contract charges:
  Life and annuities........................................................................   $   6,571   $   6,571   $  --
                                                                                                   -----   ---------       -----
                                                                                                   -----   ---------       -----
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                 GROSS
                                                                                                AMOUNT       CEDED    NET AMOUNT
                                                                                              -----------  ---------  -----------
<S>                                                                                           <C>          <C>        <C>
YEAR ENDED DECEMBER 31, 1994
Life insurance in force.....................................................................   $   1,250   $   1,250   $  --
                                                                                                   -----   ---------       -----
                                                                                                   -----   ---------       -----
Premiums and contract charges:
  Life and annuities........................................................................   $     409   $     409   $  --
                                                                                                   -----   ---------       -----
                                                                                                   -----   ---------       -----
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                 GROSS
                                                                                                AMOUNT       CEDED    NET AMOUNT
                                                                                              -----------  ---------  -----------
<S>                                                                                           <C>          <C>        <C>
YEAR ENDED DECEMBER 31, 1993
Life insurance in force.....................................................................   $   1,250   $   1,250   $  --
                                                                                                   -----   ---------       -----
                                                                                                   -----   ---------       -----
Premiums and contract charges:
  Life......................................................................................           6           6      --
  Contract charges..........................................................................          70          70      --
                                                                                                   -----   ---------       -----
                                                                                               $      76   $      76   $  --
                                                                                                   -----   ---------       -----
                                                                                                   -----   ---------       -----
</TABLE>
 
                                      F-10
<PAGE>
                                   APPENDIX A
                            MARKET VALUE ADJUSTMENT
 
    The Market Value Adjustment is based on the following:
 
I     =    the Treasury Rate for a maturity equal to the Sub-account's
           Guarantee Period for the week preceding the establishment of
           the Sub-account.
N     =    the number of whole and partial years from the date we
           receive the withdrawal, or death benefit request, or from
           the Payout Start Date to the end of the Sub-account's
           Guarantee Period.
J     =    the Treasury Rate for a maturity of length N for the week
           preceding the receipt of the withdrawal request, death
           benefit request, or income payment request. If a Note with a
           maturity of length N is not available, a weighted average
           will be used. If N is one year or less, J will be the 1-year
           Treasury Rate.
 
    Treasury  Rate  means  the U.S.  Treasury  Note Constant  Maturity  yield as
reported in Federal Reserve Bulletin Release H.15.
 
    The Market Value Adjustment factor is determined from the following formula:
 
            .9 X (I-J) X N
 
    Any transfer, withdrawal in excess of  the free withdrawal amount, or  death
benefit  paid from a Sub-account of the  Fixed Account will be multiplied by the
Market Value Adjustment factor to determine the Market Value Adjustment.
 
                                  ILLUSTRATION
 
EXAMPLE OF MARKET VALUE ADJUSTMENT
 
Purchase Payment:     $10,000
Guarantee Period:     5 Years
Guaranteed Interest
Rate:                 5.25%
5 Year Treasury Rate
at the time the
Sub-Account is
established:          6.34%
Full Withdrawal:      End of Contract Year 3
 
    NOTE: THIS ILLUSTRATION ASSUMES THAT PREMIUM TAXES WERE NOT APPLICABLE.
 
EXAMPLE 1: (ASSUMES DECLINING INTEREST RATES)
 
Step 1:  Calculate Account Value at End of Contract Year 3:
               = 10,000.00 X (1.0525)3 = $11,659.13
Step 2:  Calculate the Free Withdrawal Amount:
               = 10% X (10,000.00) = $1,000.00
Step 3:  Calculate the Withdrawal Charge:
               = .05 X (10,000.00 - 1,000.00) = $450.00
Step 4:  Calculate the Market Value Adjustment:
               I = 6.34%
               J = 5.84%
               N = 730 Days = 2
               ----------
               365 days
Market Value Adjustment Factor: .9 X (I-J) X N
               = .9 X (.0634 - .0584) X 2 = .009
Market Value Adjustment = Factor X Amount Subject to Market Value
Adjustment:
               = .009 X (11,659.13 - 1,000) = $95.93
         Calculate The Amount Received by Customers as a Result of a Full
Step 5:  Withdrawal at the end of Contract Year 3:
               = 11,659.13 - 450.00 + 95.93 = $11,305.06
 
                                      A-1
<PAGE>
EXAMPLE 2: (ASSUMES RISING INTEREST RATES)
 
Step 1:  Calculate Account Value at End of Contract Year 3:
               = 10,000.00 X (1.0525)3 = $11,659.13
Step 2:  Calculate the Free Withdrawal Amount
               = 10% X (10,000.00) = $1,000.00
Step 3:  Calculate the Withdrawal Charge:
               = .05 X (10,000.00 - 1,000.00) = $450.00
Step 4:  Calculate the Market Value Adjustment:
               I = 6.34%
               J = 6.84%
               N = 730 Days = 2
               ----------
               365 days
Market Value Adjustment Factor: .9 X (I-J) X N
               = .9 X (.0634 - .0684) X (2) = -.009
Market Value Adjustment = Factor X Amount Subject to Market Value
Adjustment:
               = -.009 X ($11,659.13 - 1,000) = -95.93
Step 5:  Calculate The Net Withdrawl Value at End of Contract Year 3:
               = 11,659.13 - 450.00 - 95.93 = $11,113.20
 
                                      A-2
<PAGE>
             STATEMENT OF ADDITIONAL INFORMATION: TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                     PAGE
                                                    ------
<S>                                                 <C>
Additions, Deletions or Substitutions of
 Investments......................................      3
Reinvestment......................................      3
The Contract......................................      3
  Purchase of Contracts...........................      3
  Performance Data................................      3
  Tax-free Exchanges (1035 Exchanges, Rollovers
   and Transfers).................................      5
  Premium Taxes...................................      5
  Tax Reserves....................................      5
Income Payments...................................      5
  Calculation of Variable Annuity Unit Values.....      5
General Matters...................................      6
  Incontestability................................      6
  Settlements.....................................      6
  Safekeeping of the Variable Account's Assets....      6
Federal Tax Matters...............................      6
  Introduction....................................      6
  Taxation of Glenbrook Life and Annuity
   Company........................................      6
  Exceptions to the Non-Natural Owner Rule........      6
  IRS Required Distribution at Death Rules........      7
  Qualified Plans.................................      7
  Types of Qualified Plans........................      7
Separate Account A Variable Account Financial
 Statements.......................................    F-1
</TABLE>
 
                                      B-1
<PAGE>
                                   ORDER FORM
 
    Please send me a copy of the most recent Statement of Additional Information
for the Glenbrook Life and Annuity Company Separate Account A.
 
<TABLE>
<S>                          <C>
 --------------------------   ----------------------------------------------------------------
          (Date)                                          (Name)
 
                              ----------------------------------------------------------------
                                                     (Street Address)
 
                              ----------------------------------------------------------------
                                   (City)               (State)              (Zip Code)
</TABLE>
 
Send to:
 
Glenbrook Life and Annuity Company
Post Office Box 94039
Palatine, Illinois 60094-4039
 
Attention: Broker Dealer Distribution
 
                                      B-2
<PAGE>
                      STATEMENT OF ADDITIONAL INFORMATION
 
             GLENBROOK LIFE AND ANNUITY COMPANY SEPARATE ACCOUNT A
 
                                   OFFERED BY
 
                       GLENBROOK LIFE AND ANNUITY COMPANY
 
                             POST OFFICE BOX 94039
                            PALATINE, IL 60094-4039
                                 1-800/776-6978
 
                 INDIVIDUAL AND GROUP FLEXIBLE PREMIUM DEFERRED
                           VARIABLE ANNUITY CONTRACTS
 
                            ------------------------
 
    This  Statement of Additional Information supplements the information in the
prospectus for  the  Individual and  Group  Flexible Premium  Deferred  Variable
Annuity  Contract offered by  Glenbrook Life and  Annuity Company ("Company"), a
wholly owned  subsidiary of  Allstate Life  Insurance Company.  The Contract  is
primarily designed to aid individuals in long-term financial planning and it can
be  used for  retirement planning regardless  of whether the  plan qualifies for
special federal  income  tax treatment.  The  prospectus may  be  obtained  from
Glenbrook  Life  and  Annuity  Company  by writing  or  calling  the  address or
telephone number listed above.
 
    THIS STATEMENT OF ADDITIONAL INFORMATION IS  NOT A PROSPECTUS AND SHOULD  BE
READ ONLY IN CONJUNCTION WITH THE PROSPECTUS FOR THE CONTRACT
 
      The prospectus, dated May 1, 1996, has been filed with the United States
                       Securities and Exchange Commission
 
                               DATED MAY 1, 1996.
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                                      PAGE
                                                                                                                      -----
<S>                                                                                                                <C>
Additions, Deletions or Substitutions of Investments.............................................................           3
Reinvestment.....................................................................................................           3
The Contract.....................................................................................................           3
  Purchase of Contracts..........................................................................................           3
  Performance Data...............................................................................................           3
  Tax-free Exchanges (1035 Exchanges, Rollovers and Transfers)...................................................           5
  Premium Taxes..................................................................................................           5
  Tax Reserves...................................................................................................           5
Income Payments..................................................................................................           5
  Calculation of Variable Annuity Unit Values....................................................................           5
General Matters..................................................................................................           6
  Incontestability...............................................................................................           6
  Settlements....................................................................................................           6
  Safekeeping of the Variable Account's Assets...................................................................           6
Federal Tax Matters..............................................................................................           6
  Introduction...................................................................................................           6
  Taxation of Glenbrook Life and Annuity Company.................................................................           6
  Exceptions to the Non-Natural Owner Rule.......................................................................           6
  IRS Required Distribution at Death Rules.......................................................................           7
  Qualified Plans................................................................................................           7
  Types of Qualified Plans.......................................................................................           7
Separate Account A Variable Account Financial Statements.........................................................         F-1
</TABLE>
 
                                       2
<PAGE>
              ADDITIONS, DELETIONS OR SUBSTITUTIONS OF INVESTMENTS
 
    The  Company  retains the  right,  subject to  any  applicable law,  to make
additions to, deletions from  or substitutions for the  Fund shares held by  any
Sub-account of the Variable Account. The Company reserves the right to eliminate
the  shares of any of the Funds and  to substitute shares of another Fund of the
Fund Series,  or of  another  open-end, registered  investment company,  if  the
shares  of  the Fund  are  no longer  available for  investment,  or if,  in the
Company's judgment, investment in any Fund would become inappropriate in view of
the purposes of the Variable Account. Substitutions of shares attributable to an
Owner's interest in  a Sub-account will  not be  made until the  Owner has  been
notified  of the  change, and until  the Securities and  Exchange Commission has
approved the change, to the extent such notification and approval is required by
the Investment  Company Act  of 1940.  Nothing contained  in this  Statement  of
Additional  Information shall prevent the Variable Account from purchasing other
securities for  other  series or  classes  of  contracts, or  from  effecting  a
conversion  between series or classes of contracts on the basis of requests made
by Owners.
 
    The  Company  may  also  establish  additional  Sub-accounts  or  series  of
Sub-accounts of the Variable Account. Each additional Sub-account would purchase
shares  in  a  new Fund  of  the Fund  Series  or  in another  mutual  fund. New
Sub-accounts may be  established when, in  the sole discretion  of the  Company,
marketing  needs or investment conditions  warrant. Any new Sub-accounts offered
in conjunction with the Contract will be made available to existing Owners on  a
basis  to be determined  by the Company.  The Company may  also eliminate one or
more Sub-accounts  if, in  its  sole discretion,  marketing, tax  or  investment
conditions so warrant.
 
    In  the  event of  any  such substitution  or  change, the  Company  may, by
appropriate endorsement, make such changes in  the Contract as may be  necessary
or  appropriate to reflect such  substitution or change. If  deemed to be in the
best interests of persons having voting rights under the policies, the  Variable
Account may be operated as a management company under the Investment Company Act
of  1940 or it may be deregistered under such Act in the event such registration
is no longer required.
 
                                  REINVESTMENT
 
    All  dividends  and   capital  gains  distributions   from  the  Funds   are
automatically  reinvested in shares of the  distributing Fund at their net asset
value.
 
                                  THE CONTRACT
 
PURCHASE OF CONTRACTS
 
    The Contracts are  offered to the  public through brokers  as well as  banks
licensed  under  the  federal  securities laws  and  state  insurance  laws. The
Contracts are distributed  through the  principal underwriter  for the  Variable
Account,  Allstate Life Financial Services, Inc., an affiliate of Glenbrook Life
and Annuity Company. The offering of the Contracts is continuous and the Company
does not anticipate discontinuing  the offering of  the Contracts. However,  the
Company reserves the right to discontinue the offering of the Contracts.
 
PERFORMANCE DATA
 
    From time to time the Variable Account may publish advertisements containing
performance  data relating  to its  Sub-accounts. The  performance data  for the
Sub-accounts (other than for the AIM V.I. Money Market Sub-account) will  always
be  accompanied  by total  return quotations.  Performance  figures used  by the
Variable Account are based on actual historical performance of its  Sub-accounts
for  specified  periods, and  the figures  are not  intended to  indicate future
performance. The  Variable  Account  may also  disclose  yield,  standard  total
return,  and non-standard total  return for periods  prior to the  date that the
Variable Account  commenced  operations.  For  periods prior  to  the  date  the
Variable   Account  commenced   operations,  performance   information  for  the
Sub-accounts will be calculated based on the performance of the underlying Funds
and the assumption that the Sub-accounts were in existence for the same  periods
as  those  of the  underlying  Funds, with  a level  of  charges equal  to those
currently assessed against the Sub-accounts.
 
    A Sub-account's "average annual total return" represents an annualization of
the Sub-account's  total return  over a  particular period  and is  computed  by
finding  the  annual  percentage  rate  which,  when  compounded  annually, will
accumulate a hypothetical $1,000 Purchase Payment to the redeemable value at the
end of the  one, five  or ten  year period, or  for a  period from  the date  of
commencement  of  the  Sub-account's  operations, if  shorter  than  any  of the
foregoing. The average annual  total return is obtained  by dividing the  ending
redeemable  value,  after  deductions  for any  Withdrawal  Charges  or Contract
Maintenance Charges imposed  on the Contracts  by the Variable  Account, by  the
initial  hypothetical  $1,000 Purchase  Payment, taking  the  "n"th root  of the
quotient (where "n" is the number of years in the period) and subtracting 1 from
the result.
 
    The Withdrawal Charges assessed upon redemption are computed as follows: the
free withdrawal amount is not  assessed a withdrawal charge. Withdrawal  charges
are  charged on the amount of redemption  equal to the purchase payment, reduced
by the amount of the free withdrawal amount, if any. The remaining amount of the
redemption, if any, is not assessed  a Withdrawal Charge. The Withdrawal  Charge
Schedule  specifies  rates based  on  the number  of  complete years  since each
Purchase Payment was made. The Contract Maintenance Charge
 
                                       3
<PAGE>
($35 per contract)  used in the  total return calculation  is normally  prorated
using  the following method: The total  amount of annual Contract fees collected
during the  year  is  divided  by  the total  average  net  assets  of  all  the
Sub-accounts. The resulting percentage is then multiplied by the ending Contract
Value.
 
    In  addition,  the  Variable Account  may  advertise the  total  return over
different periods of time by means of aggregate, average, year-by-year or  other
types  of total return  figures. Such calculations  would not reflect deductions
for Withdrawal Charges  which may be  imposed on the  Contracts by the  Variable
Account  which, if reflected,  would reduce the  performance quoted. The formula
for  computing  such  total  return  quotations  involves  a  per  unit   change
calculation. This calculation is based on the Accumulation Unit value at the end
of the defined period divided by the Accumulation Unit value at the beginning of
such  period, minus 1. The periods included in such advertisements are "year-to-
date" (prior calendar year end to the  day of the advertisement); "year to  most
recent quarter" (prior calendar year end to the end of the most recent quarter);
"the  prior calendar  year"; "'n'  most recent  Calendar Years";  and "Inception
(commencement  of   the  Sub-account's   operation)  to   date"  (day   of   the
advertisement).
 
    The  standard  total returns  for the  Sub-accounts for  the period  of each
Sub-account's operations during 1995 are presented below. Note that these  total
returns have not been annualized.
 
<TABLE>
<CAPTION>
                                                                                  TOTAL RETURN FOR THE
                                                                                      PERIOD FROM
                                                                                    INCEPTION OF THE
                                                                                      SUB-ACCOUNT
                                                                                      (12/4/95) TO
SUB-ACCOUNT                                                                             12/31/95
- --------------------------------------------------------------------------------  --------------------
<S>                                                                               <C>
AIM V.I. Capital Appreciation Fund..............................................          (7.14)%
AIM V.I. Diversified Income Fund................................................          (4.84)%
AIM V.I. Global Utilities Fund..................................................          (3.42)%
AIM V.I. Government Securities Fund.............................................          (4.70)%
AIM V.I. Growth Fund............................................................          (6.90)%
AIM V.I. Growth and Income Fund.................................................          (6.48)%
AIM V.I. International Equity Fund..............................................          (4.49)%
AIM V.I. Value Fund.............................................................          (7.55)%
AIM V.I. Money Market Fund......................................................            N/A
</TABLE>
 
    From time to time, sales literature or advertisements may also quote average
annual  total  returns  for  periods  prior to  the  date  the  Variable Account
commenced operations. Such performance information  for the Subaccounts will  be
calculated  based on the  performance of the Portfolios  and the assumption that
the Sub-accounts were in existence for  the same periods as those indicated  for
the Portfolios, with the level of Contract charges currently in effect.
 
    Such  average  annual  return  information  for  the  Subaccounts (including
deduction of the Surrender Charge) is as follows:
 
<TABLE>
<CAPTION>
                                                                                               FOR THE PERIOD
                                                       FOR THE 1-YEAR      FOR THE 5-YEAR     FROM INCEPTION OF
 SUBACCOUNT AND DATE OF INCEPTION OF CORRESPONDING      PERIOD ENDED        PERIOD ENDED      THE PORTFOLIO TO
                     PORTFOLIO                            12/31/95            12/31/95            12/31/95
- ----------------------------------------------------  -----------------  -------------------  -----------------
<S>                                                   <C>                <C>                  <C>
AIM V.I. Capital Appreciation Fund*.................         28.22%                 N/A              17.98%
AIM V.I. Diversified Income Fund*...................         11.80%                 N/A               3.81%
AIM V.I. Global Utilities Fund**....................         19.40%                 N/A               8.48%
AIM V.I. Government Securities Fund*................          8.39%                 N/A               2.22%
AIM V.I. Growth Fund*...............................         27.32%                 N/A              12.00%
AIM V.I. Growth and Income Fund**...................         26.42%                 N/A              14.40%
AIM V.I. International Equity Fund*.................         10.04%                 N/A               9.47%
AIM V.I. Value Fund*................................         28.78%                 N/A              17.03%
AIM V.I. Money Market Fund*.........................           N/A                  N/A                N/A
</TABLE>
 
- ------------
 * Portfolio inception date of May 5, 1993
** Portfolio inception date of May 2, 1994
 
OTHER TOTAL RETURNS
 
    From time to time, sales literature or advertisements may also quote average
annual total  returns  that do  not  reflect  the Surrender  Charge.  These  are
calculated in exactly the same way as the average annual total returns described
above,  except that the ending redeemable  value of the hypothetical account for
the period is replaced with  an ending value for the  period that does not  take
into   account  any  charges   on  amounts  surrendered.   Sales  literature  or
advertisements may  also quote  such average  annual total  returns for  periods
prior to the date the
 
                                       4
<PAGE>
Variable  Account commenced operations,  calculated based on  the performance of
the Portfolios and the  assumption that the Sub-accounts  were in existence  for
the  same  periods as  those indicated  for  the Portfolios,  with the  level of
Contract charges currently in effect except for the Surrender Charge.
 
    Such average  annual  total return  information  for the  Sub-accounts  (not
including deduction of the Surrender Charge) is as follows:
 
<TABLE>
<CAPTION>
                                                                                               FOR THE PERIOD
                                                       FOR THE 1-YEAR      FOR THE 5-YEAR     FROM INCEPTION OF
 SUBACCOUNT AND DATE OF INCEPTION OF CORRESPONDING      PERIOD ENDED        PERIOD ENDED      THE PORTFOLIO TO
                     PORTFOLIO                            12/31/95            12/31/95            12/31/95
- ----------------------------------------------------  -----------------  -------------------  -----------------
<S>                                                   <C>                <C>                  <C>
AIM V.I. Capital Appreciation Fund*.................         33.74%                 N/A              19.37%
AIM V.I. Diversified Income Fund*...................         17.31%                 N/A               5.52%
AIM V.I. Global Utilities Fund**....................         24.92%                 N/A              11.67%
AIM V.I. Government Securities Fund*................         13.90%                 N/A               3.96%
AIM V.I. Growth Fund*...............................         32.83%                 N/A              13.51%
AIM V.I. Growth and Income Fund**...................         31.94%                 N/A              17.48%
AIM V.I. International Equity Fund*.................         15.55%                 N/A              11.03%
AIM V.I. Value Fund*................................         34.29%                 N/A              18.43%
AIM V.I. Money Market Fund*.........................           N/A                  N/A                N/A
</TABLE>
 
- ------------
 * Portfolio inception date of May 5, 1993
** Portfolio inception date of May 2, 1994
 
    The  Variable Account may also advertise the performance of the Sub-accounts
relative to certain  performance rankings  and indexes  compiled by  independent
organizations, such as: (a) Lipper Analytical Services, Inc.; (b) the Standard &
Poor's 500 Composite Stock Price Index ("S & P 500"); (c) A.M. Best Company; (d)
Bank Rate Monitor; and (e) Morningstar.
 
TAX-FREE EXCHANGES (1035 EXCHANGES, ROLLOVERS AND TRANSFERS)
 
    The  Company accepts Purchase Payments which  are the proceeds of a Contract
in a transaction qualifying  for a tax-free exchange  under Section 1035 of  the
Internal  Revenue Code.  Except as  required by  federal law  in calculating the
basis of the Contract, the Company  does not differentiate between Section  1035
Purchase Payments and non-Section 1035 Purchase Payments.
 
    The Company also accepts "rollovers" and transfers from Contracts qualifying
as tax-sheltered annuities ("TSAs"), individual retirement annuities or accounts
("IRAs"),  or any other Qualified Contract  which is eligible to "rollover" into
an IRA. The Company differentiates among Non-Qualified Contracts, TSAs, IRAs and
other Qualified Contracts  to the extent  necessary to comply  with federal  tax
laws.  For example, the Company restricts  the assignment, transfer or pledge of
TSAs and  IRAs  so  the Contracts  will  continue  to qualify  for  special  tax
treatment.  An Owner contemplating any such  exchange, rollover or transfer of a
Contract should contact a  competent tax adviser with  respect to the  potential
effects of such a transaction.
 
PREMIUM TAXES
 
    Applicable  premium tax rates  depend on the Owner's  state of residency and
the insurance laws and status of the Company in those states where premium taxes
are incurred. Premium tax  rates may be  changed by legislation,  administrative
interpretations or judicial acts.
 
TAX RESERVES
 
    The   Company  does  not  establish  capital  gains  tax  reserves  for  the
Sub-account nor deduct  charges for  tax reserves because  the Company  believes
that  capital gains  attributable to the  Variable Account will  not be taxable.
However, the  Company reserves  the right  to deduct  charges to  establish  tax
reserves for potential taxes on realized or unrealized capital gains.
 
                                INCOME PAYMENTS
 
CALCULATION OF VARIABLE ANNUITY UNIT VALUES
 
    The  amount  of  the first  Income  Payment  is calculated  by  applying the
Contract Value  allocated  to  each Variable  Sub-account  less  any  applicable
premium  tax charge deducted at  this time, to the  income payment tables in the
Contract.  The  first  Variable  Annuity  Income  Payment  is  divided  by   the
Sub-account's then current annuity unit value to determine the number of annuity
units  upon which later  Income Payments will be  based. Variable Annuity Income
Payments after the first will be equal to the sum of the number of annuity units
determined in this manner  for each Sub-account times  the then current  annuity
unit value for each respective Sub-account.
 
    Annuity units in each variable Sub-account are valued separately and annuity
unit  values  will  depend  upon the  investment  experience  of  the particular
Portfolios in which the Sub-account invests.  The value of the annuity unit  for
each  variable Sub-account at the end of  any Valuation Period is calculated by:
(a) multiplying the annuity unit Value  at the end of the immediately  preceding
Valuation Period by the Sub-
 
                                       5
<PAGE>
accounts's  Net Investment Factor  during the period; and  then (b) dividing the
product by the sum of 1.0 plus  the assumed investment rate for the period.  The
assumed  investment rate  adjusts for  the interest  rate assumed  in the Income
Payment tables used to determine the dollar amount of the first Variable Annuity
Income Payment, and is  at an effective  annual rate which  is disclosed in  the
Contract.
 
    The  amount  of  the first  Income  Payment  paid under  an  income  plan is
determined using  the  interest  rate  and  mortality  table  disclosed  in  the
Contract.  Due  to judicial  or legislative  developments  regarding the  use of
tables which do not differentiate on the basis of sex, different annuity  tables
may be used.
 
                                GENERAL MATTERS
 
INCONTESTABILITY
 
    The Contract will not be contested after it is issued.
 
SETTLEMENTS
 
    Due  proof  of  the Owner(s)  death  (or  Annuitant's death  if  there  is a
non-natural Owner) must be received prior to settlement of a death claim.
 
SAFEKEEPING OF THE VARIABLE ACCOUNT'S ASSETS
 
    The Company holds title  to the assets of  the Variable Account. The  assets
are  kept physically segregated  and held separate and  apart from the Company's
general  corporate  assets.  Records  are   maintained  of  all  purchases   and
redemptions of the Fund shares held by each of the variable Sub-accounts.
 
    The  Fund does not issue certificates  and, therefore, the Company holds the
Account's assets in open account in  lieu of stock certificates. See the  Fund's
prospectus for a more complete description of the custodian of the Fund.
 
                              FEDERAL TAX MATTERS
 
INTRODUCTION
 
    THE  FOLLOWING DISCUSSION IS GENERAL AND IS  NOT INTENDED AS TAX ADVICE. THE
COMPANY MAKES  NO GUARANTEE  REGARDING  THE TAX  TREATMENT  OF ANY  CONTRACT  OR
TRANSACTION   INVOLVING  A  CONTRACT.  Federal,   state,  local  and  other  tax
consequences of ownership or receipt of distributions under an annuity  contract
depend  on the  individual circumstances  of each  person. If  you are concerned
about any tax  consequences with  regard to your  individual circumstances,  you
should consult a competent tax adviser.
 
TAXATION OF GLENBROOK LIFE AND ANNUITY COMPANY
 
    The  Company is taxed as a life insurance company under Part I of Subchapter
L of the  Internal Revenue Code.  Since the  Variable Account is  not an  entity
separate  from the Company,  and its operations  form a part  of the Company, it
will  not  be  taxed  separately  as  a  "Regulated  Investment  Company"  under
Subchapter  M  of the  Code. Investment  income and  realized capital  gains are
automatically applied to  increase reserves under  the contract. Under  existing
federal  income  tax  law,  the  Company  believes  that  the  Variable  Account
investment income and realized net capital gains will not be taxed to the extent
that such  income and  gains are  applied  to increase  the reserves  under  the
contract.
 
    Accordingly,  the Company does not anticipate that it will incur any federal
income tax liability  attributable to  the Variable Account,  and therefore  the
Company  does not  intend to  make provisions  for any  such taxes.  However, if
changes in the federal tax laws or interpretations thereof result in the Company
being taxed on income  or gains attributable to  the Variable Account, then  the
Company  may impose a charge against the  Variable Account (with respect to some
or all contracts) in order to set aside provisions to pay such taxes.
 
EXCEPTIONS TO THE NON-NATURAL OWNER RULE
 
    There are several exceptions  to the general rule  that contracts held by  a
non-natural  owner are not  treated as annuity contracts  for federal income tax
purposes. Contracts will generally be treated as held by a natural person if the
nominal owner is a trust or other entity which holds the contract as agent for a
natural person. However, this special exception will not apply in the case of an
employer who is the nominal owner  of an annuity contract under a  non-qualified
deferred  compensation arrangement  for its  employees. Other  exceptions to the
non-natural owner rule are: (1) contracts acquired by an estate of a decedent by
reason of  the death  of  the decedent;  (2)  certain qualified  contracts;  (3)
contracts  purchased  by employers  upon  the termination  of  certain qualified
plans; (4)  certain  contracts used  in  connection with  structured  settlement
agreements,  and (5) contracts purchased with  a single premium when the annuity
starting date  is  no  later than  a  year  from purchase  of  the  annuity  and
substantially  equal  periodic  payments  are  made,  not  less  frequently than
annually, during the annuity period.
 
                                       6
<PAGE>
IRS REQUIRED DISTRIBUTION AT DEATH RULES
 
    In order  to  be considered  an  annuity  contract for  federal  income  tax
purposes,  an annuity contract must  provide: (1) if any  owner dies on or after
the annuity start date but before the  entire interest in the contract has  been
distributed, the remaining portion of such interest must be distributed at least
as  rapidly as under the method of distribution being used as of the date of the
owner's death; (2) if any owner dies prior to the annuity start date, the entire
interest in the contract will be distributed within five years after the date of
the owner's  death. These  requirements  are satisfied  if  any portion  of  the
owner's  interest  which is  payable to  (or  for the  benefit of)  a designated
beneficiary is distributed over the life  of such beneficiary (or over a  period
not   extending  beyond  the  life  expectancy   of  the  beneficiary)  and  the
distributions begin  within  one year  of  the  owner's death.  If  the  owner's
designated beneficiary is the surviving spouse of the owner, the contract may be
continued  with  the surviving  spouse as  the new  owner. If  the owner  of the
contract is a  non-natural person,  then the annuitant  will be  treated as  the
owner  for purposes of applying the distribution  at death rules. In addition, a
change in the  annuitant on a  contract owned  by a non-natural  person will  be
treated as the death of the owner.
 
QUALIFIED PLANS
 
    This annuity contract may be used with several types of qualified plans. The
tax  rules applicable to participants in  such qualified plans vary according to
the type of plan and  the terms and conditions of  the plan itself. Adverse  tax
consequences  may  result  from excess  contributions,  premature distributions,
distributions  that  do  not  conform  to  specified  commencement  and  minimum
distribution  rules, excess distributions and in other circumstances. Owners and
participants under the plan and annuitants and beneficiaries under the  contract
may  be subject to the terms and conditions  of the plan regardless of the terms
of the contract.
 
TYPES OF QUALIFIED PLANS
 
                        INDIVIDUAL RETIREMENT ANNUITIES
 
    Section 408 of  the Code permits  eligible individuals to  contribute to  an
individual  retirement  program  known  as  an  Individual  Retirement  Annuity.
Individual Retirement Annuities are  subject to limitations  on the amount  that
can  be contributed  and on  the time  when distributions  may commence. Certain
distributions from other  types of  qualified plans may  be "rolled  over" on  a
tax-deferred basis into an Individual Retirement Annuity. IRAs generally may not
provide  life insurance, but  they may provide  a death benefit  that equals the
greater of  the  premiums paid  and  the  contract's cash  value.  The  contract
provides a death benefit that in certain circumstances may exceed the greater of
the payments and the contract value. It is possible that the Death Benefit could
be viewed as violating the prohibition on investment in life insurance contracts
with  the  result  that the  Contract  would  not be  viewed  as  satisfying the
requirements of an IRA.
 
                       SIMPLIFIED EMPLOYEE PENSION PLANS
 
    Section 408(k) of the Code allows employers to establish simplified employee
pension plans for  their employees  using the  employees' individual  retirement
annuities  if  certain criteria  are met.  Under these  plans the  employer may,
within  specified  limits,  make  deductible  contributions  on  behalf  of  the
employees  to their individual retirement  annuities. Employers intending to use
the contract in  connection with  such plans  should seek  competent advice.  In
particular,  employers should consider that IRAs  generally may not provide life
insurance, but they may provide a death  benefit that equals the greater of  the
premiums  paid  and the  contract's cash  value. The  contract provides  a death
benefit that in certain circumstances may exceed the greater of the payments and
the contract value. It  is possible that  the death benefit  could be viewed  as
violating  the prohibition  on investment in  life insurance  contracts with the
result that the contract would not  be viewed as satisfying the requirements  of
the IRS.
 
                            TAX SHELTERED ANNUITIES
 
    Section  403(b) of the Code permits public school employees and employees of
certain types of tax-exempt organizations (specified in Section 501(c)(3) of the
Code) to have their employers purchase  annuity contracts for them, and  subject
to  certain limitations,  to exclude the  purchase payments  from the employees'
gross income. An annuity  contract used for a  Section 403(b) plan must  provide
that  distributions attributable  to salary  reduction contributions  made after
12/31/88, and all earnings on salary  reduction contributions, may be made  only
after  the employee  attains age 59  1/2, separates from  service, dies, becomes
disabled  or  on  the  account   of  hardship  (earnings  on  salary   reduction
contributions  may not  be distributed for  hardship). These  limitations do not
apply to withdrawals where the  Company is directed to  transfer some or all  of
the  contract value to another Section  403(b) plan. Purchasers of the contracts
for such purposes should seek competent advice as to eligibility, limitations on
permissible amounts of purchase payments  and other tax consequences  associated
with  the contracts. In particular, purchasers should consider that the contract
provides a death benefit that in certain circumstances may exceed the greater of
the payments and  the contract  value. It is  possible that  such death  benefit
could be characterized as an incidental death benefit. If the death benefit were
so  characterized, this could result in  currently taxable income to purchasers.
In addition, there are  limitations on the amount  of incidental death  benefits
that  may be provided under  a tax-sheltered annuity. Even  if the death benefit
under the contract  were characterized  as an  incidental death  benefit, it  is
unlikely  to violate  those limits  unless the  purchaser also  purchases a life
insurance contract as part of his or her tax-sheltered annuity plan.
 
                                       7
<PAGE>
          CORPORATE AND SELF-EMPLOYED PENSION AND PROFIT SHARING PLANS
 
    Sections 401(a)  and  403(a)  of  the Code  permit  corporate  employers  to
establish  various  types of  tax favored  retirement  plans for  employees. The
Self-Employed Individuals Retirement Act of 1962, as amended, (commonly referred
to as "H.R. 10" or "Keogh")  permits self-employed individuals to establish  tax
favored  retirement plans  for themselves  and their  employees. Such retirement
plans may permit the purchase of annuity contracts in order to provide  benefits
under  the  plans.  The  contract  provides  a  death  benefit  that  in certain
circumstances may exceed the greater of the payments and the contract value.  It
is  possible that  such death  benefit could  be characterized  as an incidental
death benefit. There are limitations on  the amount of incidental benefits  that
may  be  provided  under pension  and  profit  sharing plans.  In  addition, the
provision  of  such  benefits  may   result  in  currently  taxable  income   to
participants.  Employers intending to  use the contract  in connection with such
plans should seek competent advice.
 
             STATE AND LOCAL GOVERNMENT AND TAX-EXEMPT ORGANIZATION
                          DEFERRED COMPENSATION PLANS
 
    Section 457 of the Code permits employees of state and local governments and
tax-exempt organizations to defer a portion of their compensation without paying
current taxes.  The  employees must  be  participants in  an  eligible  deferred
compensation  plan. Under these plans, contributions made for the benefit of the
employees  will  not  be  includible  in  the  employees'  gross  income   until
distribution  from  the  plan.  However,  under  a  Section  457  plan  all  the
compensation deferred under  the plan  must remain  solely the  property of  the
employer,  subject only to the claims of the employer's general creditors, until
such time as made available to the employee or a beneficiary.
 
                                       8
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
            SEPARATE ACCOUNT A VARIABLE ACCOUNT FINANCIAL STATEMENTS
 
    Financial  Statements for the Period from  December 4, 1995 (date operations
commenced) to December 31, 1995, and Independent Auditors' Report
 
                                      F-1
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
TO THE BOARD OF DIRECTORS AND SHAREHOLDER OF
GLENBROOK LIFE AND ANNUITY COMPANY
 
    We have audited the accompanying Statement  of Net Assets of Glenbrook  Life
and  Annuity Company Separate Account A (the "Account") as of December 31, 1995,
and the  related Statements  of Operations  and Changes  in Net  Assets for  the
period  from December 4, 1995 (date operations commenced), to December 31, 1995,
of the Capital  Appreciation, Diversified Income,  Global Utilities,  Government
Securities,  Growth, Growth  & Income,  International Equity,  Money Market, and
Value Funds  that  comprise the  Account.  These financial  statements  are  the
responsibility  of the Account's management. Our responsibility is to express an
opinion on these financial statements based on our audit.
 
    We conducted  our  audit  in accordance  with  generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence  supporting
the amounts and disclosures in the financial statements. Our procedures included
confirmation  of securities owned  at December 31, 1995.  An audit also includes
assessing the  accounting  principles used  and  significant estimates  made  by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.
 
    In our opinion, such  financial statements present  fairly, in all  material
respects, the financial position of the Account as of December 31, 1995, and the
results  of its operations  and the changes in  net assets of  each of the funds
comprising the Account, for  the period from December  4, 1995 (date  operations
commenced),  to  December  31,  1995,  in  conformity  with  generally  accepted
accounting principles.
 
March 1, 1996
 
                                      F-2
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
                   SEPARATE ACCOUNT A STATEMENT OF NET ASSETS
 
<TABLE>
<CAPTION>
                                                                                                       DECEMBER 31, 1995
                                                                                                       -----------------
<S>                                                                                                    <C>
ASSETS
  Investments in the AIM Variable Insurance Funds, Inc.:
    Capital Appreciation Fund 591 shares (cost $9,495)...............................................      $   9,784
    Diversified Income Fund no shares issued
    Global Utilities Fund no shares issued
    Government Securities Fund no shares issued
    Growth Fund 71 shares (cost $999)................................................................          1,023
    Growth & Income Fund 77 shares (cost $999).......................................................          1,023
    International Equity Fund 691 shares (cost $9,232)...............................................          9,440
    Money Market Fund no shares issued
    Value Fund 586 shares (cost $9,242)..............................................................          9,442
                                                                                                              ------
        Total assets.................................................................................         30,712
 
LIABILITIES
  Payable to Glenbrook Life and Annuity Company -- Accrued contract maintenance charges..............              3
                                                                                                              ------
        Net assets...................................................................................      $  30,709
                                                                                                              ------
                                                                                                              ------
</TABLE>
 
                       See notes to financial statements.
 
                                      F-3
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
                   SEPARATE ACCOUNT A STATEMENT OF OPERATIONS
                      FOR THE PERIOD FROM DECEMBER 4, 1995
                          (DATE OPERATIONS COMMENCED)
                              TO DECEMBER 31, 1995
<TABLE>
<CAPTION>
                                                                           AIM VARIABLE INSURANCE FUNDS, INC.
                                                             --------------------------------------------------------------
                                                                 CAPITAL        DIVERSIFIED      GLOBAL       GOVERNMENT
                                                              APPRECIATION        INCOME        UTILITIES     SECURITIES
                                                                  FUND             FUND           FUND           FUND
                                                             ---------------  ---------------  -----------  ---------------
<S>                                                          <C>              <C>              <C>          <C>
INVESTMENT INCOME:
  Dividends................................................     $  --            $  --          $  --          $  --
  Less charges from Glenbrook Life and Annuity Company:
    Mortality and expense risk.............................            (3)
    Administrative expense.................................            (1)
      Net investment income (loss).........................            (4)          --             --             --
                                                                      ---              ---            ---            ---
REALIZED AND UNREALIZED GAINS ON INVESTMENTS:
  Realized gains from sales of investments:
    Proceeds from sales....................................             6
    Cost of investments sold...............................            (5)
                                                                      ---              ---            ---            ---
      Net realized gains...................................             1           --             --             --
                                                                      ---              ---            ---            ---
Change in unrealized gains and losses......................           289           --             --             --
                                                                      ---              ---            ---            ---
      Net gains on investments.............................           290           --             --             --
                                                                      ---              ---            ---            ---
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS.............     $     286        $  --          $  --          $  --
                                                                      ---              ---            ---            ---
                                                                      ---              ---            ---            ---
 
<CAPTION>
 
                                                                           AIM VARIABLE INSURANCE FUNDS, INC.
                                                             --------------------------------------------------------------
                                                                GROWTH &       INTERNATIONAL      MONEY
                                                                 INCOME           EQUITY         MARKET          VALUE
                                                                  FUND             FUND           FUND           FUND
                                                             ---------------  ---------------  -----------  ---------------
<S>                                                          <C>              <C>              <C>          <C>
INVESTMENT INCOME:
  Dividends................................................     $  --            $  --          $  --          $  --
  Less charges from Glenbrook Life and Annuity Company:
    Mortality and expense risk.............................            (1)              (3)            (3)           (10)
    Administrative expense.................................            (1)
                                                                      ---              ---            ---            ---
      Net investment income (loss).........................            (1)              (3)        --                 (3)
                                                                      ---              ---            ---            ---
REALIZED AND UNREALIZED GAINS ON INVESTMENTS:
  Realized gains from sales of investments:
    Proceeds from sales....................................            43               18              8             76
    Cost of investments sold...............................           (42)             (18)            (8)           (74)
                                                                      ---              ---            ---            ---
      Net realized gains...................................             1           --             --             --
                                                                      ---              ---            ---            ---
Change in unrealized gains and losses......................            23              208         --                200
                                                                      ---              ---            ---            ---
      Net gains on investments.............................            24              208         --                200
                                                                      ---              ---            ---            ---
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS.............     $      23        $     205      $  --          $     197
                                                                      ---              ---            ---            ---
                                                                      ---              ---            ---            ---
 
<CAPTION>
 
                                                               GROWTH
                                                                FUND
                                                             -----------
<S>                                                          <C>
INVESTMENT INCOME:
  Dividends................................................   $  --
  Less charges from Glenbrook Life and Annuity Company:
    Mortality and expense risk.............................
    Administrative expense.................................
      Net investment income (loss).........................      --
                                                                    ---
REALIZED AND UNREALIZED GAINS ON INVESTMENTS:
  Realized gains from sales of investments:
    Proceeds from sales....................................           1
    Cost of investments sold...............................          (1)
                                                                    ---
      Net realized gains...................................      --
                                                                    ---
Change in unrealized gains and losses......................          24
                                                                    ---
      Net gains on investments.............................          24
                                                                    ---
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS.............   $      24
                                                                    ---
                                                                    ---
 
                                                                TOTAL
                                                             -----------
<S>                                                          <C>
INVESTMENT INCOME:
  Dividends................................................   $  --
  Less charges from Glenbrook Life and Annuity Company:
    Mortality and expense risk.............................
    Administrative expense.................................
                                                                    ---
      Net investment income (loss).........................         (11)
                                                                    ---
REALIZED AND UNREALIZED GAINS ON INVESTMENTS:
  Realized gains from sales of investments:
    Proceeds from sales....................................
    Cost of investments sold...............................
                                                                    ---
      Net realized gains...................................           2
                                                                    ---
Change in unrealized gains and losses......................         744
                                                                    ---
      Net gains on investments.............................         746
                                                                    ---
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS.............   $     735
                                                                    ---
                                                                    ---
</TABLE>
 
                       See notes to financial statements.
 
                                      F-4
<PAGE>
                       GLENBROOK LIFE AND ANNUITY COMPANY
             SEPARATE ACCOUNT A STATEMENT OF CHANGES IN NET ASSETS
                      FOR THE PERIOD FROM DECEMBER 4, 1995
                (DATE OPERATIONS COMMENCED) TO DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                        AIM VARIABLE INSURANCE FUNDS, INC.
                                                 --------------------------------------------------------------------------------
                                                    CAPITAL     DIVERSIFIED    GLOBAL      GOVERNMENT                  GROWTH &
                                                 APPRECIATION     INCOME      UTILITIES    SECURITIES      GROWTH       INCOME
                                                   PORTFOLIO     PORTFOLIO    PORTFOLIO     PORTFOLIO     PORTFOLIO    PORTFOLIO
                                                 -------------  -----------  -----------  -------------  -----------  -----------
<S>                                              <C>            <C>          <C>          <C>            <C>          <C>
FROM OPERATIONS:
  Net investment loss..........................    $      (4)    $  --        $  --         $  --         $  --        $      (1)
  Net realized gains...........................            1                                                                   1
  Net change in unrealized gains and losses....          289                                                     24           23
                                                       -----         -----        -----         -----         -----        -----
                                                         286        --           --            --                24           23
                                                       -----         -----        -----         -----         -----        -----
FROM CAPITAL TRANSACTIONS:
  Deposits.....................................        9,500                                                  1,000        1,000
  Benefit payments.............................
  Payments on termination......................
  Contract maintenance charges.................           (1)
  Transfers among the portfolios and with the
   Fixed Account, net..........................           (2)                                                    (1)
                                                       -----         -----        -----         -----         -----        -----
                                                       9,497        --           --            --               999        1,000
                                                       -----         -----        -----         -----         -----        -----
Increase in net assets.........................        9,783        --           --            --             1,023        1,023
Net assets, beginning of period................
                                                       -----         -----        -----         -----         -----        -----
Net assets, end of period......................    $   9,783     $  --        $  --         $  --         $   1,023    $   1,023
                                                       -----         -----        -----         -----         -----        -----
                                                       -----         -----        -----         -----         -----        -----
NET ASSET VALUE PER UNIT, END OF PERIOD........    $    9.83     $  --        $  --         $  --         $    9.86    $    9.90
                                                       -----         -----        -----         -----         -----        -----
                                                       -----         -----        -----         -----         -----        -----
UNITS OUTSTANDING, END OF PERIOD...............          996        --           --            --               104          103
                                                       -----         -----        -----         -----         -----        -----
                                                       -----         -----        -----         -----         -----        -----
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                     AIM VARIABLE INSURANCE FUNDS, INC.
                                                                             --------------------------------------------------
                                                                             INTERNATIONAL     MONEY
                                                                                EQUITY        MARKET        VALUE
                                                                               PORTFOLIO     PORTFOLIO    PORTFOLIO     TOTAL
                                                                             -------------  -----------  -----------  ---------
<S>                                                                          <C>            <C>          <C>          <C>
FROM OPERATIONS:
  Net investment loss......................................................    $      (3)    $  --        $      (3)  $     (11)
  Net realized gains.......................................................                                                   2
  Net change in unrealized gains and losses................................          208                        200         744
                                                                                   -----         -----        -----   ---------
                                                                                     205        --              197         735
                                                                                   -----         -----        -----   ---------
FROM CAPITAL TRANSACTIONS:
  Deposits.................................................................        9,250                      9,250      30,000
  Benefit payments.........................................................                                              --
  Payments on termination..................................................                                              --
  Contract maintenance charges.............................................           (1)                        (1)         (3)
  Transfers among the portfolios and with the Fixed Account, net...........          (15)                        (5)        (23)
                                                                                   -----         -----        -----   ---------
                                                                                   9,234        --            9,244      29,974
                                                                                   -----         -----        -----   ---------
Increase in net assets.....................................................        9,439        --            9,441      30,709
Net assets, beginning of period............................................                                              --
                                                                                   -----         -----        -----   ---------
Net assets, end of period..................................................    $   9,439     $  --        $   9,441   $  30,709
                                                                                   -----         -----        -----   ---------
                                                                                   -----         -----        -----   ---------
NET ASSET VALUE PER UNIT, END OF PERIOD....................................    $   10.10     $  --        $    9.78
                                                                                   -----         -----        -----
                                                                                   -----         -----        -----
UNITS OUTSTANDING, END OF PERIOD...........................................          936        --              966
                                                                                   -----         -----        -----
                                                                                   -----         -----        -----
</TABLE>
 
                       See notes to financial statements.
 
                                      F-5
<PAGE>
             GLENBROOK LIFE AND ANNUITY COMPANY SEPARATE ACCOUNT A
                         NOTES TO FINANCIAL STATEMENTS
        FOR THE PERIOD FROM DECEMBER 4, 1995 (DATE OPERATIONS COMMENCED)
                              TO DECEMBER 31, 1995
 
1.  ORGANIZATION
    Glenbrook  Life and  Annuity Company Separate  Account A  (the "Account"), a
unit investment trust  registered with  the Securities  and Exchange  Commission
under  the Investment Company  Act of 1940,  is a Separate  Account of Glenbrook
Life and Annuity Company ("Glenbrook Life"),  which is wholly owned by  Allstate
Life  Insurance Company ("Allstate Life"), a wholly-owned subsidiary of Allstate
Insurance  Company  ("Allstate"),  which  is   wholly  owned  by  The   Allstate
Corporation  (the "Corporation").  The Account  was established  on September 6,
1995, by  resolution of  the Board  of  Directors of  Glenbrook Life  and  began
accepting contractholder deposits on December 4, 1995.
 
    Glenbrook  Life writes certain annuity contracts,  the proceeds of which are
invested at  the discretion  of  the contractholder.  Contractholders  primarily
invest  in units of the  portfolios comprising the Account,  for which they bear
investment risk.  The  Account,  in  turn,  invests  solely  in  shares  of  the
portfolios  of the AIM Variable Insurance Funds ("Fund"). The contractholder may
also invest  in  the  general  account  of  Glenbrook  Life  ("Fixed  Account").
Glenbrook Life provides administrative and insurance services to the Account for
a fee.
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
VALUATION OF INVESTMENTS
 
    Investments  consist of shares in the portfolios of the Fund, and are stated
at fair value based on quoted market prices.
 
RECOGNITION OF INVESTMENT INCOME
 
    Investment income consists of  dividends declared by  the portfolios of  the
Fund, and is recognized on the date of record.
 
REALIZED GAINS AND LOSSES
 
    Realized  gains and losses on the sale of shares by the Account are computed
on a weighted average cost ("cost") basis.
 
CONTRACTHOLDER ACCOUNT ACTIVITY
 
    Account activity is  reflected in  individual contractholder  accounts on  a
daily basis.
 
    For  each year or portion of a year  a contract is in effect, Glenbrook Life
deducts a fixed annual contract maintenance  charge of $35 as reimbursement  for
expenses related to the maintenance of each contract and the Account. The amount
of this charge is guaranteed not to increase over the life of the contract. This
charge  is  waived if  the  total purchase  payments are  $50,000  or more  on a
contract anniversary, or if all money is  allocated to the Fixed Account on  the
contract anniversary.
 
FEDERAL INCOME TAXES
 
    Net  investment income and  realized gains and losses  on investments of the
Account  are  taxable  to  the  contractholders,  generally  upon  distribution.
Accordingly, no provision for income taxes has been recorded.
 
3.  MORTALITY AND EXPENSE CHARGES
    Glenbrook Life assumes mortality and expense risks related to the operations
of the Account and deducts charges daily at a rate, on an annual basis, equal to
1.35% of the daily net assets of the Account. Glenbrook Life guarantees that the
amount of this charge will not increase over the life of the contract.
 
4.  ADMINISTRATIVE EXPENSE CHARGE
    Glenbrook Life deducts administrative expense charges daily at a rate, on an
annual  basis, equal to .10% of the daily net assets of the Account. This charge
is designed to cover additional administrative expenses.
 
                                      F-6
<PAGE>
             GLENBROOK LIFE AND ANNUITY COMPANY SEPARATE ACCOUNT A
                         NOTES TO FINANCIAL STATEMENTS
        FOR THE PERIOD FROM DECEMBER 4, 1995 (DATE OPERATIONS COMMENCED)
                              TO DECEMBER 31, 1995
 
5.  UNITS ISSUED AND REDEEMED
    Units issued and redeemed by the Account during 1995 were as follows:
<TABLE>
<CAPTION>
                                                                 AIM VARIABLE INSURANCE FUNDS, INC.
                                 --------------------------------------------------------------------------------------------------
                                                                        GLOBAL
                                      CAPITAL         DIVERSIFIED      UTILITIES       GOVERNMENT                   GROWTH & INCOME
                                 APPRECIATION FUND    INCOME FUND        FUND        SECURITIES FUND   GROWTH FUND       FUND
                                 -----------------  ---------------  -------------  -----------------  -----------  ---------------
<S>                              <C>                <C>              <C>            <C>                <C>          <C>
UNITS OUTSTANDING AT DECEMBER
 4, 1995 (DATE OPERATIONS
 COMMENCED)....................             --                --              --               --              --             --
Unit activity from December 4,
 1995 (date operations
 commenced) to December 31,
 1995
  Issued.......................            996                                                                104            103
  Redeemed.....................             (0)                                                                (0)            (0)
                                            --                --              --               --              --             --
UNITS OUTSTANDING, DECEMBER 31,
 1995..........................            996                --              --               --             104            103
                                            --                --              --               --              --             --
                                            --                --              --               --              --             --
 
<CAPTION>
 
                                   INTERNATIONAL       MONEY
                                    EQUITY FUND     MARKET FUND  VALUE FUND
                                 -----------------  -----------     -----
<S>                              <C>                <C>          <C>
UNITS OUTSTANDING AT DECEMBER
 4, 1995 (DATE OPERATIONS
 COMMENCED)....................             --              --           --
Unit activity from December 4,
 1995 (date operations
 commenced) to December 31,
 1995
  Issued.......................            936                          966
  Redeemed.....................             (0)                          (0)
                                            --              --           --
UNITS OUTSTANDING, DECEMBER 31,
 1995..........................            936              --          966
                                            --              --           --
                                            --              --           --
</TABLE>
 
UNITS REDEEMED INCLUDES UNITS DEDUCTED FOR ACCRUED CONTRACT MAINTENANCE CHARGES.
 
                                      F-7


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