NORTHBROOK VARIABLE ANNUITY ACCOUNT
497, 1996-05-14
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<PAGE>
                      NORTHBROOK VARIABLE ANNUITY ACCOUNT
 
                                       OF
 
                       NORTHBROOK LIFE INSURANCE COMPANY
                                 P.O. BOX 94040
                            PALATINE, IL 60094-4040
 
                     INDIVIDUAL VARIABLE ANNUITY CONTRACTS
 
                                 DISTRIBUTED BY
 
                           DEAN WITTER REYNOLDS INC.
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                              -------------------
 
    This  Prospectus describes  the Flexible  Premium Deferred  Variable Annuity
Contract ("Contract") offered by Northbrook Life Insurance Company  ("Company"),
a  wholly  owned  subsidiary of  Allstate  Life Insurance  Company.  Dean Witter
Reynolds Inc. ("Dean Witter")  is the principal  underwriter and distributor  of
the Contracts.
 
    The  Contract has the  flexibility to allow  you to shape  an annuity to fit
your particular  needs.  It  is  primarily designed  to  aid  you  in  long-term
financial planning and can be used for retirement planning regardless of whether
the plan qualifies for special federal income tax treatment.
 
   
    This Prospectus is a concise statement of the relevant information about the
Northbrook  Variable Annuity Account ("Variable  Account") which you should know
before making a  decision to  purchase the Contract.  This Prospectus  generally
describes  only the variable portion of the Contract. For a brief summary of the
fixed portion of the Contract, see "The Fixed Account" on page 22.
    
 
   
    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 below. For your convenience, an
order  form for the Statement of Additional  Information may be found on page 29
of this  Prospectus.  Before ordering,  you  may wish  to  review the  Table  of
Contents  of  the  Statement  of  Additional  Information  on  page  28  of this
Prospectus. The Statement  of Additional  Information has  been incorporated  by
reference into this Prospectus.
    
 
                       NORTHBROOK LIFE INSURANCE COMPANY
                                 P.O. BOX 94040
                         PALATINE, ILLINOIS 60094-4040
                                 (800) 654-2397
 
                 THIS PROSPECTUS IS VALID ONLY WHEN ACCOMPANIED
                  OR PRECEDED BY A CURRENT PROSPECTUS FOR THE
                     DEAN WITTER VARIABLE INVESTMENT SERIES
 
  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 DATE OF THIS PROSPECTUS IS MAY 1, 1996.
<PAGE>
THE CONTRACTS ARE AVAILABLE IN ALL STATES (EXCEPT NEW YORK), PUERTO RICO AND THE
                             DISTRICT OF COLUMBIA.
 
    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.
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                                  PAGE
                                                                                                  -----
<S>                                                                                            <C>
Glossary.....................................................................................           4
Introduction.................................................................................           6
Summary of Separate Account Expenses.........................................................           9
Condensed Financial Information..............................................................          11
Performance Data.............................................................................          13
Financial Statements.........................................................................          13
Northbrook Life Insurance Company and the Variable Account...................................          13
    Northbrook Life Insurance Company........................................................          13
    Dean Witter Reynolds Inc.................................................................          14
    The Variable Account.....................................................................          14
    The Dean Witter Variable Investment Series...............................................          14
The Contracts................................................................................          16
    Purchase of the Contracts................................................................          16
    Crediting of Purchase Payments...........................................................          16
    Allocation of Purchase Payments..........................................................          16
    Value of Variable Account Accumulation Units.............................................          16
    Transfers................................................................................          17
    Surrender and Withdrawals................................................................          17
    Default..................................................................................          18
Charges and Other Deductions.................................................................          18
    Deductions from Purchase Payments........................................................          18
    Contract Maintenance Charge..............................................................          18
    Mortality and Expense Risk Charge........................................................          18
    Surrender Charge.........................................................................          19
    Taxes....................................................................................          20
    Dean Witter Variable Investment Series ("Fund") Expenses.................................          20
Benefits Under the Contract..................................................................          20
    Death Benefits Prior to the Income Starting Date.........................................          20
    Death Benefits After the Income Starting Date............................................          20
Income Payments..............................................................................          21
    Income Starting Date.....................................................................          21
    Amount of Variable Annuity Income Payments...............................................          21
    Annuity Options..........................................................................          21
The Fixed Account............................................................................          22
    General Description......................................................................          22
    Transfers, Surrenders, and Withdrawals...................................................          23
General Matters..............................................................................          24
    Owner....................................................................................          24
    Beneficiary..............................................................................          24
    Delay of Payments........................................................................          24
    Assignments..............................................................................          24
    Modification.............................................................................          24
    Customer Inquiries.......................................................................          24
</TABLE>
    
 
                                       2
<PAGE>
   
<TABLE>
<CAPTION>
                                                                                                  PAGE
                                                                                                  -----
<S>                                                                                            <C>
Federal Tax Matters..........................................................................          25
    Introduction.............................................................................          25
    Taxation of Annuities in General.........................................................          25
      Tax Deferral...........................................................................          25
      Non-Natural Owners.....................................................................          25
      Diversification Requirements...........................................................          25
      Investor Control.......................................................................          25
      Taxation of Partial and Full Withdrawals...............................................          25
      Taxation of Annuity Payments...........................................................          26
      Taxation of Annuity Death Benefits.....................................................          26
      Penalty Tax on Premature Distributions.................................................          26
      Aggregation of Annuity Contracts.......................................................          26
    Tax Qualified Contracts..................................................................          26
      Restrictions Under Section 403(b) Plans................................................          26
    Income Tax Withholding...................................................................          27
Voting Rights................................................................................          27
Sales Commissions............................................................................          27
Statement of Additional Information: Table of Contents.......................................          28
Order Form...................................................................................          29
</TABLE>
    
 
                                       3
<PAGE>
                                    GLOSSARY
 
    ACCUMULATION  UNIT--An accounting unit used  to calculate the Contract Value
in the Variable Account prior to  the Income Starting Date. Each Sub-Account  of
the Variable Account has its own distinct Accumulation Unit value.
 
    AGE--Age on last birthday.
 
    ANNUITANT--A  person whose life determines  the duration of annuity payments
involving life  contingencies. "Annuitant"  may include  a Joint  Annuitant,  if
named prior to January 19, 1985.
 
    ANNUITANT'S  BENEFICIARY--The person(s) designated in  the Contract who will
receive the Death Benefit  when the Annuitant  is not an Owner,  the Owner is  a
natural  person, and the  Annuitant dies prior  to the Income  Starting Date. An
irrevocable Annuitant's Beneficiary is an Annuitant's Beneficiary whose  written
consent  is required before you may change the Annuitant's Beneficiary, make the
Annuitant an Owner, or make an assignment.*
 
    ANNUITY  UNIT--An  accounting  unit  used  to  calculate  Variable   Annuity
payments. Each Sub-Account has a distinct Annuity Unit value.
 
    AUTOMATIC  ADDITIONS--Additional Purchase Payments of  $25 or more which are
made  automatically  from  the  Owner's  bank  account  or  Dean  Witter  Active
Assets-TM- Account.
 
    AUTOMATIC   INCOME--Partial  withdrawals  of  $100  or  more  may  be  taken
automatically from the Contract Value and sent to the Owner or deposited in  the
Owner's  bank account or Dean Witter  Active Assets-TM- Account or sent directly
to the Owner.
 
    BENEFICIARY--The person to whom  benefits will be paid  upon the earlier  of
the  Owner's or Annuitant's death, including  any contingent beneficiary. In the
event a Beneficiary is not named, the  Company will treat the Contract Owner  or
the  estate of the Contract Owner as the Beneficiary. Under the revised Contract
(see footnote below), the Beneficiary may  be either the Owner's Beneficiary  or
the Annuitant's Beneficiary.*
 
    COMPANY--The  issuer  of the  Contract,  Northbrook Life  Insurance Company,
which is a wholly-owned subsidiary of Allstate Life Insurance Company.
 
    CONTINGENT ANNUITANT--The  person  who will  become  the Annuitant,  if  the
Annuitant  and Joint Annuitant, if applicable,  die prior to the Income Starting
Date. A Contingent Annuitant must be named  prior to the death of the  Annuitant
or the Income Starting Date, whichever occurs first.*
 
    CONTINGENT  OWNER--The person who will become Owner of the Contract upon the
death(s) of the Owner  and any Joint  Owner, so long as  the Annuitant or  Joint
Annuitant, if applicable, is still living.*
 
    CONTRACT--The  Flexible Premium Deferred Variable  Annuity Contract known as
the "Dean Witter  Variable Annuity," that  is described in  this prospectus  (in
Oregon,  Pennsylvania  and  Texas,  the Contract  is  known  as  the "Northbrook
Variable Annuity").
 
    CONTRACT ANNIVERSARY--An  anniversary  of the  date  that the  Contract  was
issued to the Contract Owner.*
 
    CONTRACT  VALUE--The  sum of  the value  of all  Accumulation Units  for the
Variable Account plus the value in the Fixed Account.
 
    CONTRACT YEAR--The year commencing  on either the Issue  Date or a  Contract
Anniversary.
 
    DATE  OF DEATH--The Date that an Owner and/or Annuitant dies causing a Death
Benefit to be due.*
 
                                       4
<PAGE>
    DEATH BENEFIT--The amount  payable to the  Beneficiary on the  death of  the
Annuitant  (and Joint Annuitant, if named prior  to January 19, 1985) so long as
no Contingent Annuitant is living, and so long as the death occurs on or  before
the date the IRS Required Distribution must be made or the Income Starting Date,
whichever is earlier.
 
    DOLLAR  COST AVERAGING--A  method to transfer  $100 or more  of the Contract
Value in the Money Market Sub-Account automatically to the other Sub-Accounts on
a monthly basis.
 
    DUE PROOF OF DEATH--One of the following
 
        (a) A copy of a certified death certificate.
 
        (b) A copy of a certified decree of a court of competent jurisdiction as
           to the finding of death.
 
        (c) Any other proof satisfactory to the Company.
 
    FIXED ACCOUNT--All of  the assets of  the Company that  are not in  separate
accounts.
 
    FIXED ANNUITY--An annuity with payments having a guaranteed amount.
 
    FREE  WITHDRAWAL  AMOUNT--A  portion  of the  Contract  Value  which  may be
withdrawn without  incurring  a Surrender  Charge,  i.e., 10%  of  all  Purchase
Payments made at least one year before the date of withdrawal.
 
    INCOME  PAYMENTS--A series of periodic annuity  payments made by the Company
to the Contract Owner or Beneficiary.
 
    INCOME STARTING  DATE--The  date Income  Payments  are to  begin  under  the
Contract.
 
    INVESTMENT ALTERNATIVE--The Fixed Account and the eleven Sub-Accounts of the
Variable Account constitute the twelve Investment Alternatives.
 
    JOINT ANNUITANT--The person, along with the Annuitant, whose life determines
the  duration of annuity payments under a  joint and last survivor annuity. If a
Joint Annuitant was named  before January 19, 1985,  the Joint Annuitant is  the
person  who will become the Annuitant if  the Annuitant dies prior to the Income
Starting Date.
 
    NET INVESTMENT  FACTOR--The  factor for  a  particular Sub-Account  used  to
determine  the value of an  Accumulation Unit and Annuity  Unit in any Valuation
Period.
 
    NON-QUALIFIED CONTRACTS--Contracts that do  not qualify for special  federal
income tax treatment.
 
    OWNER--The person designated as the owner in the Contract or as subsequently
changed.  If  a  Contract is  jointly  owned,  rights and  privileges  under the
Contract must  be  exercised jointly  by  each Owner.  If  a Contract  has  been
absolutely  assigned, the assignee is the Owner. A collateral assignee is not an
Owner.
 
   
    OWNER'S BENEFICIARY--The person(s) designated in the Contract who, after the
death of all  Owners, may elect  to receive  the Death Benefit  or continue  the
Contract  as  described  in  "Benefits  Under  the  Contract"  on  page  20.  An
irrevocable Owner's  Beneficiary  is an  Owner's  Beneficiary whose  consent  is
required before you may change the Owner's Beneficiary, add an Owner, or make an
assignment.*
    
 
    PORTFOLIOS--The   mutual  fund  portfolios  of   The  Dean  Witter  Variable
Investment Series  (formerly  named  Dean  Witter  Variable  Annuity  Investment
Series).  The  Dean  Witter  Variable  Investment  Series  has  eleven  separate
Portfolios: the Money Market Portfolio,  the Quality Income Plus Portfolio,  the
High  Yield Portfolio, the  Utilities Portfolio, the  Dividend Growth Portfolio,
the Capital Growth Portfolio, the Global Dividend Growth Portfolio, the European
Growth Portfolio, the  Pacific Growth  Portfolio, the Equity  Portfolio and  the
Strategist Portfolio.
 
    PURCHASE PAYMENTS--The premiums paid by the Owner to the Company.
 
                                       5
<PAGE>
    QUALIFIED  CONTRACTS--Contracts issued under plans  that qualify for special
federal income tax treatment.
 
    REQUIRED MINIMUM DISTRIBUTION--For Qualified Contracts, withdrawals equal to
the IRS Required Minimum Distribution may be taken from the Cash Value and  sent
to  the Owner  or deposited in  the Owner's  bank account or  Dean Witter Active
Assets-TM- Account.
 
    SUB-ACCOUNT--A  sub-division  of  the  Variable  Account.  Each  Sub-Account
invests exclusively in shares of a specified Portfolio.
 
    SURRENDER  CHARGE--The charge that may be assessed by the Company on full or
partial withdrawals  of the  Contract Value  in excess  of the  Free  Withdrawal
Amount.
 
    VALUATION  DATE--Each  day that  the  New York  Stock  Exchange is  open for
business, and any other day  in which there is  sufficient degree of trading  in
the  Variable Account's portfolio  securities that the  value of Accumulation or
Annuity Units  might be  materially affected  by  changes in  the value  of  the
portfolio securities. The Valuation Date does not include such other 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 business  of each  Valuation Date and  ending at  the close  of
business of the next succeeding Valuation Date.
 
    VARIABLE ACCOUNT--Northbrook Variable Annuity Account, a separate investment
account  established by the Company to  receive and invest the Purchase Payments
paid under the Contracts.
 
    VARIABLE ANNUITY--An annuity  with payments  that have  no predetermined  or
guaranteed  dollar amounts. The payments will vary in amounts depending upon the
investment experience of one or more of the Portfolios.
 
    *The Company revised the Contract on March 1, 1990. These designations  have
been modified in the revised Contract for clarification.
 
INTRODUCTION
- --------------------------------------------------------------------------------
 
1.  WHAT IS THE PURPOSE OF THE CONTRACT?
    The  Contract seeks to allow  you to accumulate funds  and to receive Income
Payments  which  reflect  changes  in  the  cost  of  living  before  and  after
retirement. THERE IS NO ASSURANCE THAT THIS GOAL WILL BE ACHIEVED. In attempting
to achieve this goal, the Owner can allocate Purchase Payments to one or more of
the Variable Account Portfolios.
 
   
    Because  Contract  Values  and  Income  Payments  depend  on  the investment
experience of the  selected Portfolios,  the Owner bears  the entire  investment
risk  for  amounts allocated  to the  Variable Account.  See "Value  of Variable
Account Accumulation Units," pg. 16 and "Income Payments," pg. 21.
    
 
2.  WHAT TYPES OF INVESTMENTS UNDERLIE THE VARIABLE ACCOUNT?
 
    The Variable  Account  invests exclusively  in  shares of  the  Dean  Witter
Variable  Investment Series (the  "Fund"), a mutual fund  managed by Dean Witter
InterCapital, Inc., a wholly owned subsidiary  of Dean Witter Reynolds Inc.  The
Fund  has eleven Portfolios: the Money Market Portfolio, the Quality Income Plus
Portfolio, the  High  Yield Portfolio,  the  Utilities Portfolio,  the  Dividend
Growth  Portfolio,  the Capital  Growth  Portfolio, the  Global  Dividend Growth
Portfolio, the  European Growth  Portfolio, the  Pacific Growth  Portfolio,  the
Equity Portfolio, and the Strategist Portfolio. The assets of each Portfolio are
held  separately  from the  other Portfolios  and  each has  distinct investment
 
                                       6
<PAGE>
objectives and policies which are  described in the accompanying Prospectus  for
the Fund.
 
3.  HOW DO I PURCHASE A CONTRACT?
 
    The  Company  has discontinued  the  offering of  new  Contracts. Additional
Purchase Payments to existing Contracts are accepted by the Company.
 
    Automatic Additions allow you to systematically build toward your  long-term
financial  plan on a  monthly basis by making  subsequent Purchase Payments from
your bank  account or  your Dean  Witter Active  Assets-TM- Account.  Subsequent
Purchase  Payments must be $25 or more and may  be made at any time prior to the
Income Starting Date.
 
   
    The Company may limit the total Purchase Payments in any year to three times
the Purchase Payments made during the first Contract Year. See "Purchase of  the
Contracts," pg. 16 and "Crediting of Purchase Payments," pg. 16.
    
 
4.  HOW DO I ALLOCATE PURCHASE PAYMENTS?
 
   
    On  your  application, you  will allocate  your  Purchase Payment  among the
Sub-Accounts and the Fixed  Account. All allocations must  be in whole  percents
from 0% to 100% and must total 100%. Allocations may be changed by notifying the
Company in writing. See "Allocation of Purchase Payments," pg. 16.
    
 
5.  CAN I TRANSFER AMOUNTS AMONG THE SUB-ACCOUNTS?
 
    Transfers  can be made  among the eleven Sub-Accounts  and the Fixed Account
without charge. Transfers  must be at  least $100  or the entire  amount in  the
Investment Alternative whichever is less.
 
    Dollar  Cost  Averaging  automatically  moves funds  from  the  Money Market
Sub-Account on a monthly basis to other Sub-Accounts of your choice.
 
   
    Certain transfers may be restricted. See "Transfers," pg. 17.
    
 
6.  CAN I GET MY MONEY IF I NEED IT?
 
   
    All or part of the  Contract Value can be  withdrawn before the earliest  of
the  Income Starting  Date, the  death of  any Owner  or the  death of  the last
surviving Annuitant. Partial withdrawals may also be taken automatically through
monthly Automatic Income withdrawals. See "Surrender and Withdrawals," pg. 17.
    
 
    No Surrender  Charges  will be  deducted  from  the first  withdrawal  in  a
Contract  Year on amounts up to the Free Withdrawal Amount. Amounts withdrawn in
excess of the Free Withdrawal Amount may be subject to a Surrender Charge of  0%
to  6% depending on how long the  withdrawn Purchase Payments have been invested
in the Contract.  THE COMPANY  GUARANTEES THAT THE  AGGREGATE SURRENDER  CHARGES
WILL NEVER EXCEED 7% OF THE PURCHASE PAYMENTS.
 
   
    For  Non-Qualified Contracts, i.e. Contracts  not qualifying for special tax
treatment, a penalty tax may be imposed on withdrawals. Federal and state income
tax may be withheld from  withdrawal and surrender amounts. Qualified  Contracts
may  also have certain restrictions and penalties on withdrawals. See "Surrender
and Withdrawals," pg. 17, and "Taxation of Annuities in General," pg. 25.
    
 
7.  WHAT ARE THE CHARGES AND DEDUCTIONS UNDER THE CONTRACT?
 
   
    To allow you to  invest the entire Purchase  Payment, the Company  currently
does  not deduct sales charges at the time of investment. Annually, however, the
Company  deducts  $30  for  maintaining  the  Contract  ("Contract   Maintenance
Charge").  THIS AMOUNT IS GUARANTEED NOT  TO INCREASE. See "Contract Maintenance
Charge," pg. 18, for how and when this charge is deducted.
    
 
    The Company deducts a daily charge equal  on an annual basis to 1.0% of  the
Contract's daily net assets of the Variable Account and will reflect this charge
in  the net interest rate credited to  amounts in the Fixed Account allocable to
the Contracts in  order to pay  the Death  Benefit and expenses  not covered  by
 
                                       7
<PAGE>
   
the  Contract Maintenance Charge.  See "Mortality and  Expense Risk Charge," pg.
18.
    
 
    Additional deductions may  be made  for certain  taxes. Ordinarily,  premium
taxes  will be deducted when money is withdrawn from the Contract or when Income
Payments under an Annuity Option begin. The Company reserves the right to deduct
such taxes  from  Purchase  Payments  at  the  time  such  taxes  are  incurred.
Currently, no deductions are made for capital gains tax reserve.
 
8.  WHAT ANNUITY OPTIONS ARE AVAILABLE UNDER THE CONTRACT?
 
   
    The  Owner may  receive Income  Payments on  a completely  variable basis, a
completely fixed  basis, or  a variable  and  fixed basis.  The Owner  has  some
flexibility  in choosing when Income Payments  begin. Payments must begin by the
later of the month following the Annuitant's 85th birthday or the 10th  Contract
Anniversary. See "Income Payments," pg. 21 and "Income Starting Date," pg. 21.
    
 
   
    Three  Annuity Options are listed in the  Contract: (1) payments for life of
the Annuitant, but  with 120  monthly payments  guaranteed; (2)  payments for  a
specified  period; and  (3) payments  for the  life of  the Annuitant  and Joint
Annuitant. Other options may be available at the Company's discretion;  however,
Surrender  Charges may apply if Income Payments  are made for a specified period
of less than 120 months. See "Annuity Options," pg. 21.
    
 
    Federal tax law may limit the availability of Annuity Options.
 
9.  DOES THE CONTRACT PAY ANY GUARANTEED DEATH BENEFITS?
 
    Death benefits  will be  paid to  the  Beneficiary if  the Owner(s)  or  the
Annuitant(s)  (and  no Contingent  Annuitant is  still  living), die  before the
Income Starting Date. The Death  Benefit will be the greater  of (1) the sum  of
all  Purchase Payment(s)  less any amounts  deducted in  connection with partial
withdrawals, including any Surrender Charges,  or (2) the Contract Value.  Death
benefits  after the  Income Starting  Date, if any,  will depend  on the Annuity
Option chosen.
 
   
    The Beneficiary has 180 days from the  date of death of the Owner(s) or  the
Annuitant(s)  to either elect an  Annuity Option or to  take a lump sum payment.
See "Benefits Under the Contract" pg. 20.
    
 
10.  IS THERE A FREE-LOOK PROVISION?
 
    Owners may cancel  a Contract anytime  within 10 days  after receipt of  the
Contract  and receive a full refund of  Purchase Payments allocated to the Fixed
Account. Unless a refund  of Purchase Payments is  required by State or  Federal
law,  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.
 
11.  DOES THE CONTRACT OWNER HAVE ANY VOTING RIGHTS UNDER THE CONTRACT?
 
   
    The  Owner  can instruct  the Company  how  to vote  shares of  any eligible
Portfolio attributable to the Contract. See "Voting Rights," pg. 27.
    
 
                    *                   *                   *
 
   
    This prospectus describes only the variable aspects of the Contract,  except
where  fixed aspects are specifically mentioned. See  pg. 22 for a brief summary
of the Fixed Account.
    
 
                                       8
<PAGE>
SUMMARY OF SEPARATE ACCOUNT EXPENSES
- --------------------------------------------------------------------------------
 
    The  following fee table  illustrates all expenses and  fees that the Owners
will incur. The expenses and  fees set forth in the  table are based on  charges
under  the  Contracts  and on  the  expenses  of the  separate  account  and the
underlying Fund for the fiscal year ended December 31, 1995.
 
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 amount surrendered)*
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                  Applicable Sales
ELAPSED TIME SINCE PURCHASE PAYMENT BEING WITHDRAWN WAS MADE                                      Charge Percentage
- -----------------------------------------------------------------------------------------------  -------------------
<S>                                                                                              <C>
Less than 1 year...............................................................................          6%
1 year, but less than 2 years..................................................................          5%
2 years, but less than 3 years.................................................................          4%
3 years, but less than 4 years.................................................................          3%
4 years, but less than 5 years.................................................................          2%
5 years, but less than 6 years.................................................................          1%
6 years or more................................................................................          0%
</TABLE>
 
<TABLE>
<S>                                                                                                   <C>
Exchange Fee........................................................................................       None
Annual Contract Fee.................................................................................  $      30
</TABLE>
 
SEPARATE ACCOUNT ANNUAL EXPENSES (AS A PERCENTAGE OF AVERAGE ACCOUNT VALUE)
<TABLE>
<CAPTION>
                            MONEY MARKET    QUALITY INCOME                                     DIVIDEND GROWTH
                                SUB-           PLUS SUB-     HIGH YIELD SUB-  UTILITIES SUB-        SUB-        CAPITAL GROWTH
                               ACCOUNT          ACCOUNT          ACCOUNT          ACCOUNT          ACCOUNT       SUB- ACCOUNT
                           ---------------  ---------------  ---------------  ---------------  ---------------  ---------------
<S>                        <C>              <C>              <C>              <C>              <C>              <C>
Mortality and Expense
 Risk Charges:...........            1%               1%               1%               1%               1%               1%
Total Separate Account
 Annual Expenses:........            1%               1%               1%               1%               1%               1%
 
<CAPTION>
                           GLOBAL DIVIDEND  EUROPEAN GROWTH   PACIFIC GROWTH
                             GROWTH SUB-          SUB-             SUB-          EQUITY SUB-    STRATEGIST SUB-
                               ACCOUNT          ACCOUNT           ACCOUNT          ACCOUNT          ACCOUNT
                           ---------------  ----------------  ---------------  ---------------  ----------------
<S>                        <C>              <C>               <C>              <C>              <C>
Mortality and Expense
 Risk Charges:...........            1%                1%               1%               1%                1%
Total Separate Account
 Annual Expenses:........            1%                1%               1%               1%                1%
</TABLE>
 
DEAN WITTER VARIABLE INVESTMENT SERIES ("FUND") EXPENSES (AS A PERCENTAGE OF
FUND AVERAGE NET ASSETS)
   
<TABLE>
<CAPTION>
                                                                                                                        GLOBAL
                                                                                         DIVIDEND        CAPITAL       DIVIDEND
                        MONEY MARKET   QUALITY INCOME   HIGH YIELD      UTILITIES         GROWTH         GROWTH         GROWTH
                          PORTFOLIO    PLUS PORTFOLIO    PORTFOLIO      PORTFOLIO       PORTFOLIO       PORTFOLIO      PORTFOLIO
                        -------------  --------------  -------------  --------------  --------------  -------------  -------------
<S>                     <C>            <C>             <C>            <C>             <C>             <C>            <C>
Management Fees:......         .50%           .50%(1)         .50%           .65%(2)         .59%(3)         .65%           .75%
Other Expenses:.......         .03%           .04%            .04%           .03%            .02%            .09%           .13%
Total Fund Annual
 Expenses:............         .53%           .54%            .54%           .68%            .61%            .74%           .88%
 
<CAPTION>
 
                          EUROPEAN       PACIFIC
                           GROWTH         GROWTH         EQUITY        STRATEGIST
                          PORTFOLIO     PORTFOLIO      PORTFOLIO       PORTFOLIO
                        -------------  ------------  --------------  --------------
<S>                     <C>            <C>           <C>             <C>
Management Fees:......        1.00%          1.00%          .50%(4)          .50%
Other Expenses:.......         .17%           .44%          .04%             .02%
Total Fund Annual
 Expenses:............        1.17%          1.44%          .54%             .52%
</TABLE>
    
 
- --------------------------
 
*   There are  no Contingent Deferred Sales Charges  on the first withdrawal  of
    each Contract Year on amounts up to the Free Withdrawal Amount.
(1)    This percentage  is  applicable to  Portfolio net  assets  of up  to $500
    million. For net assets which exceed  $500 million, the management fee  will
    be 0.45%.
(2)    This percentage  is  applicable to  Portfolio net  assets  of up  to $500
    million. For net assets which exceed  $500 million, the management fee  will
    be 0.55%.
(3)  The management fee will be 0.625% for net assets of up to $500 million. For
    net  assets which  exceed $500  million, but do  not exceed  $1 billion, the
    management fee will be 0.50% and for net assets that exceed $1 billion,  the
    management fee will be 0.475%.
(4)   This percentage is applicable to Portfolio net assets of up to $1 billion.
    For net assets which exceed $1 billion, the management fee will be 0.475%.
 
                                       9
<PAGE>
EXAMPLE
 
    You (the Owner)  would pay the  following expenses on  a $1,000  investment,
assuming a 5% annual return under the following circumstances:
 
    If  you surrender your Contract at the end of the applicable time period (or
if you annuitize for a specified period of less than 120 months):
 
<TABLE>
<CAPTION>
                                                                              1 YEAR       3 YEARS      5 YEARS     10 YEARS
                                                                            -----------  -----------  -----------  -----------
<S>                                                                         <C>          <C>          <C>          <C>
Money Market Sub-Account..................................................   $      63    $      81    $      99    $     191
Quality Income Plus Sub-Account...........................................   $      63    $      82    $      99    $     192
High Yield Sub-Account....................................................   $      63    $      82    $      99    $     192
Utilities Sub-Account.....................................................   $      65    $      86    $     107    $     208
Dividend Growth Sub-Account...............................................   $      64    $      84    $     103    $     200
Equity Sub-Account........................................................   $      63    $      82    $      99    $     192
Strategist Sub-Account....................................................   $      63    $      81    $      98    $     190
Capital Growth Sub-Account................................................   $      65    $      88    $     110    $     214
European Growth Sub-Account...............................................   $      69    $     101    $     132    $     260
Pacific Growth Sub-Account................................................   $      72    $     109    $     146    $     288
Global Dividend Growth Sub-Account........................................   $      67    $      92    $     117    $     229
</TABLE>
 
    If you do not surrender 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>
                                                                              1 YEAR       3 YEARS      5 YEARS     10 YEARS
                                                                            -----------  -----------  -----------  -----------
<S>                                                                         <C>          <C>          <C>          <C>
Money Market Sub-Account..................................................   $      17    $      51    $      88    $     191
Quality Income Plus Sub-Account...........................................   $      17    $      52    $      89    $     192
High Yield Sub-Account....................................................   $      17    $      52    $      89    $     192
Utilities Sub-Account.....................................................   $      18    $      56    $      96    $     208
Dividend Growth Sub-Account...............................................   $      17    $      54    $      92    $     200
Equity Sub-Account........................................................   $      17    $      52    $      89    $     192
Strategist Sub-Account....................................................   $      16    $      51    $      88    $     190
Capital Growth Sub-Account................................................   $      19    $      58    $      99    $     214
European Growth Sub-Account...............................................   $      23    $      71    $     122    $     260
Pacific Growth Sub-Account................................................   $      26    $      79    $     136    $     288
Global Dividend Growth Sub-Account........................................   $      20    $      62    $     107    $     229
</TABLE>
 
    The  above  example should  not be  considered a  representation of  past or
future expense or performance. Actual expenses  of a Sub-Account may be  greater
or lesser than those shown.
- --------------------------
 *Early  Withdrawal Charges  may be  deducted from the  Cash Value  before it is
  applied to an income plan with a specified period of less than 120 months.
 
                                       10
<PAGE>
CONDENSED FINANCIAL INFORMATION
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                             ACCUMULATION UNIT VALUES AND NUMBER
                                                            OF ACCUMULATION UNITS OUTSTANDING FOR
                                                                      EACH SUB-ACCOUNT*
                                                             FOR THE PERIODS ENDING DECEMBER 31
                                  -----------------------------------------------------------------------------------------
                                     1986        1987        1988       1989       1990       1991       1992       1993
                                  ----------  ----------  ----------  ---------  ---------  ---------  ---------  ---------
<S>                               <C>         <C>         <C>         <C>        <C>        <C>        <C>        <C>
MONEY MARKET SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........     $11.430     $12.043     $12.669    $13.459    $14.532    $15.530    $16.260    $16.651
  Accumulation Unit Value, End
   of Period....................     $12.043     $12.669     $13.459    $14.532    $15.530    $16.260    $16.651    $16.940
  Number of Units Outstanding,
   End of Period................   3,501,808   5,479,058   5,743,470  5,269,945  7,300,227  4,993,305  3,142,381  2,402,295
HIGH YIELD SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........     $14.019     $16.407     $15.745    $17.324    $14.993    $10.864    $17.064    $20.008
  Accumulation Unit Value, End
   of Period....................     $16.407     $15.745     $17.324    $14.993    $10.864    $17.064    $20.008    $24.609
  Number of Units Outstanding,
   End of Period................  12,472,735  12,161,618  11,091,971  6,425,388  2,487,589  1,973,508  1,677,444  1,537,549
EQUITY SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........     $13.511     $15.623     $14.510    $15.786    $18.580    $17.728    $27.916    $27.681
  Accumulation Unit Value, End
   of Period....................     $15.623     $14.510     $15.786    $18.580    $17.728    $27.916    $27.681    $32.807
  Number of Units Outstanding,
   End of Period................   2,767,931   3,615,560   2,524,904  3,123,809  2,302,425  2,025,964  1,886,301  1,800,750
QUALITY INCOME PLUS SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........          --     $10.000     $10.172    $10.828    $12.097    $12.798    $15.016    $16.096
  Accumulation Unit Value, End
   of Period....................          --     $10.172     $10.828    $12.097    $12.798    $15.016    $16.096    $18.010
  Number of Units Outstanding,
   End of Period................          --   2,366,834   2,589,488  4,028,103  4,292,424  4,272,603  4,167,157  3,998,449
STRATEGIST SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........          --     $10.000     $10.036    $11.211    $12.284    $12.351    $15.684    $16.651
  Accumulation Unit Value, End
   of Period....................          --     $10.036     $11.211    $12.284    $12.351    $15.684    $16.651    $18.199
  Number of Units Outstanding,
   End of Period................          --   2,689,906   5,526,856  7,164,494  5,424,907  4,805,519  4,762,207  4,409,391
UTILITIES SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........          --          --          --         --    $10.000    $10.365    $12.372    $13.797
  Accumulation Unit Value, End
   of Period....................          --          --          --         --    $10.365    $12.372    $13.797    $15.804
  Number of Units Outstanding,
   End of Period................          --          --          --         --  3,364,215  3,655,014  3,883,303  3,932,991
DIVIDEND GROWTH SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........          --          --          --         --    $10.000     $9.143    $11.564    $12.383
  Accumulation Unit Value, End
   of Period....................          --          --          --         --     $9.143    $11.564    $12.383    $14.019
  Number of Units Outstanding,
   End of Period................          --          --          --         --  5,838,210  5,646,884  6,048,975  5,878,916
 
<CAPTION>
 
                                    1994        1995
                                  ---------  ----------
<S>                               <C>        <C>
MONEY MARKET SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........    $16.940     $17.411
  Accumulation Unit Value, End
   of Period....................    $17.411     $18.215
  Number of Units Outstanding,
   End of Period................  2,408,602   1,486,360
HIGH YIELD SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........    $24.609     $23.759
  Accumulation Unit Value, End
   of Period....................    $23.759     $27.055
  Number of Units Outstanding,
   End of Period................  1,202,135     906,011
EQUITY SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........    $32.807     $30.885
  Accumulation Unit Value, End
   of Period....................    $30.885     $43.585
  Number of Units Outstanding,
   End of Period................  1,652,850   1,314,532
QUALITY INCOME PLUS SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........    $18.010     $16.648
  Accumulation Unit Value, End
   of Period....................    $16.648     $20.498
  Number of Units Outstanding,
   End of Period................  2,779,045   2,159,205
STRATEGIST SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........    $18.199     $18.728
  Accumulation Unit Value, End
   of Period....................    $18.728     $20.284
  Number of Units Outstanding,
   End of Period................  3,994,684   2,708,051
UTILITIES SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........    $15.804     $14.235
  Accumulation Unit Value, End
   of Period....................    $14.235     $18.132
  Number of Units Outstanding,
   End of Period................  2,814,866   2,298,190
DIVIDEND GROWTH SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........    $14.019     $13,425
  Accumulation Unit Value, End
   of Period....................    $13.425     $18.128
  Number of Units Outstanding,
   End of Period................  5,229,279   4,402,940
</TABLE>
 
                                       11
<PAGE>
CONDENSED FINANCIAL INFORMATION (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                             ACCUMULATION UNIT VALUES AND NUMBER
                                                            OF ACCUMULATION UNITS OUTSTANDING FOR
                                                                      EACH SUB-ACCOUNT*
                                                             FOR THE PERIODS ENDING DECEMBER 31
                                  -----------------------------------------------------------------------------------------
                                     1986        1987        1988       1989       1990       1991       1992       1993
                                  ----------  ----------  ----------  ---------  ---------  ---------  ---------  ---------
<S>                               <C>         <C>         <C>         <C>        <C>        <C>        <C>        <C>
CAPITAL GROWTH SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........          --          --          --         --         --    $10.000    $12.735    $12.814
  Accumulation Unit Value, End
   of Period....................          --          --          --         --         --    $12.735    $12.814    $11.799
  Number of Units Outstanding,
   End of Period................          --          --          --         --         --    468,488    681,326    457,147
EUROPEAN GROWTH SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........          --          --          --         --         --    $10.000    $10.050    $10.347
  Accumulation Unit Value, End
   of Period....................          --          --          --         --         --    $10.050    $10.347    $14.433
  Number of Units Outstanding,
   End of Period................          --          --          --         --         --    101,037    251,802    767,814
GLOBAL DIVIDEND GROWTH
 SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........          --          --          --         --         --         --         --         --
  Accumulation Unit Value, End
   of Period....................          --          --          --         --         --         --         --         --
  Number of Units Outstanding,
   End of Period................          --          --          --         --         --         --         --         --
PACIFIC GROWTH SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........          --          --          --         --         --         --         --         --
  Accumulation Unit Value, End
   of Period....................          --          --          --         --         --         --         --         --
  Number of Units Outstanding,
   End of Period................          --          --          --         --         --         --         --         --
 
<CAPTION>
 
                                    1994        1995
                                  ---------  ----------
<S>                               <C>        <C>
CAPITAL GROWTH SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........    $11.799     $11.533
  Accumulation Unit Value, End
   of Period....................    $11.533     $15.177
  Number of Units Outstanding,
   End of Period................    321,342     256,312
EUROPEAN GROWTH SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........    $14.433     $15.484
  Accumulation Unit Value, End
   of Period....................    $15.484     $19.299
  Number of Units Outstanding,
   End of Period................    868.638     649,852
GLOBAL DIVIDEND GROWTH
 SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........    $10.000      $9.942
  Accumulation Unit Value, End
   of Period....................     $9.942     $12.012
  Number of Units Outstanding,
   End of Period................    951,857     852,851
PACIFIC GROWTH SUB-ACCOUNT
  Accumulation Unit Value,
   Beginning of Period..........    $10.000      $9.248
  Accumulation Unit Value, End
   of Period....................     $9.248      $9.682
  Number of Units Outstanding,
   End of Period................    644,451     608,464
</TABLE>
 
*The Money Market, High  Yield and Equity  Sub-Accounts commenced operations  on
March  9, 1984.  The Quality Income  Plus and  Strategist Sub-Accounts commenced
operations on  March 1,  1987. The  Utilities and  Dividend Growth  Sub-Accounts
commenced  operations on March  1, 1990. The Capital  Growth and European Growth
Sub-Accounts commenced operations on March  1, 1991. The Global Dividend  Growth
and  Pacific Growth Sub-Accounts commenced operations  on February 23, 1994. The
Accumulation Unit Value  for each  of these  Sub-Accounts was  initially set  at
$10.000.
 
                                       12
<PAGE>
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  Money  Market Sub-Account)  will  always  be
accompanied by total return quotations for the most recent one, five or ten year
periods,  or for a period from inception to date if the Sub-Account has not been
available for one  of the prescribed  periods. The total  return quotations  for
each  period will be the average annual  rates of return required for an initial
Purchase Payment  of  $1,000 to  equal  the amount  Owners  would receive  on  a
withdrawal  of  the  Purchase Payment,  after  reflection of  all  recurring and
nonrecurring charges.
 
    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 may  or may  not reflect  the
deduction of some or all of the charges which may be imposed on the Contracts by
the  Variable Account which, if reflected,  would reduce the performance quoted.
The Variable Account from time to time may also advertise the performance of the
Sub-Accounts relative to  certain performance rankings  and indexes compiled  by
independent organizations.
 
    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.  More  detailed
information on  the computation  is set  forth in  the Statement  of  Additional
Information.
 
FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------
 
   
    The  financial  statements of  the Northbrook  Variable Annuity  Account and
Northbrook Life Insurance Company  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 pg. 29.)
    
 
NORTHBROOK LIFE INSURANCE COMPANY AND THE VARIABLE ACCOUNT
- --------------------------------------------------------------------------------
 
NORTHBROOK LIFE INSURANCE COMPANY
 
    The Company is the issuer of the  Contract. Incorporated in 1978 as a  stock
life  insurance company under the laws  of Illinois, the Company sells annuities
and individual life insurance. The Company  is currently licensed to operate  in
the  District of  Columbia, all  states (except New  York) and  Puerto Rico. 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"), which is  a stock life  insurance company incorporated  under
the  laws of  Illinois. Allstate Life  is a wholly-owned  subsidiary of Allstate
Insurance Company ("Allstate"), which is a stock insurance company  incorporated
under  the laws of Illinois. With the exception of directors' qualifying shares,
all of  the outstanding  capital stock  of  Allstate is  owned by  The  Allstate
Corporation  ("Corporation").  In June  1995, Sears,  Roebuck and  Co. ("Sears")
distributed in  a tax-free  dividend  to its  stockholders its  remaining  80.3%
ownership  in the Corporation. As a result  of the distribution, Sears no longer
has an ownership interest in the Corporation.
 
DEAN WITTER REYNOLDS INC.
 
    Dean Witter Reynolds Inc.  ("Dean Witter") is  the principal underwriter  of
the  Contract. Dean Witter is a wholly-owned subsidiary of Dean Witter, Discover
& Co.  ("Dean Witter  Discover"). Dean  Witter  is located  at Two  World  Trade
Center,  New York,  New York.  Dean Witter  is a  member of  the New  York Stock
Exchange and the National Association of Securities Dealers, Inc.
 
                                       13
<PAGE>
    Dean  Witter's  wholly-owned  subsidiary,  Dean  Witter  InterCapital,  Inc.
("InterCapital"),  is  the  investment  manager  of  the  Dean  Witter  Variable
Investment Series. InterCapital is registered  with the Securities and  Exchange
Commission  as an investment adviser. As compensation for investment management,
the Fund pays InterCapital a monthly advisory fee. These expenses are more fully
described in the Fund's prospectus attached to this prospectus.
 
    In October, 1993, Allstate through Allstate Life and the Company,  announced
a  strategic alliance to develop, market  and distribute proprietary annuity and
life insurance products through Dean Witter account executives.
 
THE VARIABLE ACCOUNT
 
    Established on February 14, 1983, the Variable Account is a unit  investment
trust   registered  with  the  Securities  and  Exchange  Commission  under  the
Investment Company Act of 1940, but 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.
 
    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  Variable Account  has been  divided into  eleven Sub-Accounts,  each of
which invests solely in its corresponding Portfolio of the Dean Witter  Variable
Investment Series. Additional Sub-Accounts may be added at the discretion of the
Company.
 
THE DEAN WITTER VARIABLE INVESTMENT SERIES
 
    The  Variable Account  will invest exclusively  in the  Dean Witter Variable
Investment Series  (the "Fund").  Shares of  the Fund  are offered  to  separate
accounts of the Company which fund variable annuity and variable life contracts.
Shares  of the Fund  are also offered  to separate accounts  of a life insurance
company affiliated with  the Company  which fund variable  annuity and  variable
life  contracts. Shares of the Fund may  also be offered to separate accounts of
certain  non-affiliated  life  insurance  companies  which  fund  variable  life
insurance  contracts.  It  is  conceivable  that in  the  future  it  may become
disadvantageous for both  variable life and  variable annuity contract  separate
accounts to invest in the same underlying fund. Although neither the Company nor
the  Fund currently foresees any such disadvantage, the Fund's Board of Trustees
intends to  monitor events  in  order to  identify any  material  irreconcilable
conflict  between the interests of variable annuity contract owners and variable
life contract owners and to  determine what action, if  any, should be taken  in
response thereto.
 
    Investors in the High Yield Portfolio should carefully consider the relative
risks  of investing in high  yield securities, which are  commonly known as junk
bonds. Bonds of this type  are considered to be  speculative with regard to  the
payment  of  interest  and return  of  principal.  Investors in  the  High Yield
Portfolio should also  be cognizant  of the fact  that such  securities are  not
generally  made for short-term investing and  should assess the risks associated
with an investment in the High Yield Portfolio.
 
    Shares of the Portfolios of the Fund are not deposits, or obligations of, or
guaranteed or endorsed by any bank and  the shares are not federally insured  by
the  Federal Deposit  Insurance Corporation,  the Federal  Reserve Board  or any
other agency.
 
    The Fund  has eleven  portfolios; the  Money Market  Portfolio, the  Quality
Income  Plus Portfolio, the  High Yield Portfolio,  the Utilities Portfolio, the
Dividend Growth Portfolio,  the Capital  Growth Portfolio,  the Global  Dividend
Growth  Portfolio, the European  Growth Portfolio the  Pacific Growth Portfolio,
the
 
                                       14
<PAGE>
Equity Portfolio  and the  Strategist Portfolio.  Each Portfolio  has  different
investment objectives and policies and operates as a separate investment fund.
 
    The  Money  Market  Portfolio  seeks high  current  income,  preservation of
capital, and  liquidity  by  investing  in  certain  money  market  instruments,
principally  U.S.  government  securities,  bank  obligations,  and  high  grade
commercial paper.
 
    The Quality Income Plus Portfolio seeks, as its primary objective, to earn a
high  level  of  current   income  and,  as   a  secondary  objective,   capital
appreciation,  but only when consistent with its primary objective, by investing
primarily in debt  securities issued by  the U.S. Government,  its agencies  and
instrumentalities,   including  zero  coupon   securities  and  in  fixed-income
securities rated A or higher by  Moody's Investors Service, Inc. ("Moody's")  or
Standard  & Poor's Corporation ("Standard &  Poor's") or non-rated securities of
comparable quality, and  by writing covered  call and put  options against  such
securities.
 
    The  High Yield Portfolio  seeks, as its  primary objective, to  earn a high
level of current  income by  investing in a  professionally managed  diversified
portfolio  consisting principally of fixed-income  securities rated Baa or lower
by Moody's or  BBB or  lower by  Standard &  Poor's or  non-rated securities  of
comparable  quality which are commonly known as  junk bonds, and, as a secondary
objective, capital appreciation when consistent with its primary objective.
 
    The Utilities Portfolio seeks to provide current income and long-term growth
of income  and  capital  by  investing  primarily  in  equity  and  fixed-income
securities of companies engaged in the public utilities industry.
 
    The Dividend Growth Portfolio seeks to provide reasonable current income and
long-term growth of income and capital by investing primarily in common stock of
companies  with a  record of paying  dividends and the  potential for increasing
dividends.
 
    The Capital Growth Portfolio  seeks to provide  long-term capital growth  by
investing principally in common stocks.
 
    The  Global Dividend  Growth Portfolio  seeks to  provide reasonable current
income and long-term  growth of  income and  capital by  investing primarily  in
common  stock of companies, issued by issuers worldwide, with a record of paying
dividends and the potential for increasing dividends.
 
    The European Growth Portfolio seeks to maximize the capital appreciation  of
its  investments by investing primarily in  securities issued by issuers located
in Europe.
 
    The Pacific Growth Portfolio seeks  to maximize the capital appreciation  of
its  investments by investing primarily in  securities issued by issuers located
in Asia, Australia and New Zealand.
 
    The Equity  Portfolio seeks,  as its  primary objective,  growth of  capital
through  investments in  common stock  of companies  believed by  the Investment
Manager to have  potential for superior  growth and, as  a secondary  objective,
income when consistent with its primary objective.
 
    The  Strategist Portfolio  seeks a  high total  investment return  through a
fully  managed  investment  policy  utilizing  equity  securities,  fixed-income
securities  rated Baa  or higher by  Moody's or  BBB or higher  by securities of
comparable quality), and  money market  securities, and the  writing of  covered
options on such securities and the collateralized sale of stock index options.
 
    All  dividends  and  capital  gains distributions  from  the  Portfolios are
automatically reinvested in shares  of the distributing  Portfolio at their  Net
Asset Value.
 
    THERE  IS  NO  ASSURANCE  THAT  ANY  OF  THE  PORTFOLIOS  WILL  ATTAIN THEIR
RESPECTIVE STATED OBJECTIVES. Additional  information concerning the  investment
objectives and policies of the Portfolios can be found in the current prospectus
for the Fund accompanying this Prospectus.
 
    THE  PROSPECTUS OF THE FUND SHOULD BE  READ CAREFULLY BEFORE ANY DECISION IS
MADE CONCERNING THE ALLOCATION OF PURCHASE PAYMENTS TO A PARTICULAR PORTFOLIO.
 
                                       15
<PAGE>
THE CONTRACTS
- --------------------------------------------------------------------------------
 
PURCHASE OF THE CONTRACTS
 
    The Company  has  discontinued the  offering  of new  Contracts.  Additional
Purchase  Payments  to  existing  Contracts are  accepted  by  the  Company. All
subsequent Purchase Payments must  be $25 or  more and may be  made at any  time
prior to the Income Starting Date. Additional Purchase Payments may also be made
from  your bank  account or your  Dean Witter Active  Assets-TM- Account through
Automatic Additions. Please consult with your Dean Witter Account Executive  for
detailed information about Automatic Additions.
 
    The  Company reserves the  right to limit Purchase  Payments in any Contract
Year to three times the initial Purchase Payment made in the first year.
 
CREDITING OF PURCHASE PAYMENTS
    A Purchase  Payment accompanied  by  a duly  completed application  will  be
credited  to the Contract within two business  days of receipt by the Company at
its home  office. If  an application  is not  duly completed,  the Company  will
credit the Purchase Payments to the Contract within five business days or return
it  at  that time  unless  the applicant  specifically  consents to  the Company
holding the  Purchase Payment  until the  application is  complete. The  Company
reserves  the right to reject any application. Subsequent Purchase Payments will
be credited to the Contract  at the close of  the Valuation Period during  which
the Purchase Payment is received.
 
ALLOCATION OF PURCHASE PAYMENTS
 
    On  the  application the  Owner instructs  the Company  how to  allocate the
Purchase Payment among the twelve Investment Alternatives. Purchase Payments may
be allocated in whole percents, from  0% to 100%, to any Investment  Alternative
so  long as the total allocation equals 100%. Purchase Payments may be allocated
in amounts no less than $100.  Unless the Owner notifies the Company  otherwise,
subsequent  Purchase Payments are allocated according to the instructions in the
application.
 
   
    Each Purchase Payment will be credited  to the Contract as Variable  Account
Accumulation  Units equal  to the amount  of Purchase Payment  allocated to each
Sub-Account divided by  the Accumulation  Unit value for  that Sub-Account  next
computed after the Purchase Payment is credited to the Contract. 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
Portfolio (see "Value of Variable Account Accumulation Units," pg. 16).
    
 
   
    For a brief summary of how Purchase Payments allocated to the Fixed  Account
are credited to the Contract, see "The Fixed Account" on pg. 22.
    
 
VALUE OF VARIABLE ACCOUNT ACCUMULATION UNITS
 
    The  Accumulation  Units in  each Sub-Account  of  the Variable  Account are
valued separately. The  value of  Accumulation Units may  change each  Valuation
Period  according to the investment performance  of the shares purchased by each
Sub-Account and the deduction of certain expenses and charges.
 
    A Valuation  Period is  the period  between successive  Valuation Dates.  It
begins  at the close of business of each Valuation Date and ends at the close of
business of the  next succeeding Valuation  Date. A Valuation  Date is each  day
that the New York Stock Exchange is open for business and any other day in which
there  is a  sufficient degree  of trading  in the  Variable Account's portfolio
securities that the value of Accumulation  or Annuity Units might be  materially
affected by changes in the value of the portfolio securities. Valuation Dates do
not  include such Federal  and non-Federal holidays  as are observed  by the New
York Stock  Exchange.  The  New  York  Stock  Exchange  currently  observes  the
following  holidays:  New Year's  Day (January  1);  President's Day  (the third
Monday in February); Good Friday (the  Friday before Easter); Memorial Day  (the
last  Monday in May); Independence Day (July  4); Labor Day (the first Monday in
 
                                       16
<PAGE>
September); Thanksgiving Day  (the fourth Thursday  in November); and  Christmas
Day (December 25).
 
    The  value of an Accumulation Unit in a 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  is  a  number
representing  the change on  successive Valuation Dates  in value of Sub-Account
assets due to investment income, realized  or unrealized capital gains or  loss,
deductions  for taxes, if any, and deductions for the Mortality and Expense Risk
Charge.
 
TRANSFERS
 
    The Owner  may  transfer  funds among  the  twelve  Investment  Alternatives
without  charge. THE COMPANY GUARANTEES THAT NO  CHARGE WILL EVER BE IMPOSED FOR
TRANSFERS. Transfers must be at least $100 or the total amount in the Investment
Alternative, whichever is less.
    Currently transfers out of any  Sub-Account before the Income Starting  Date
may  be  made at  any  time. The  Company reserves  the  right to  restrict such
transfers before  the Income  Starting Date  to  once every  30 days  after  the
Contract  is issued. However,  the Company will  notify Owners at  least 30 days
prior to restricting transfers.
 
    After the Income Starting Date, transfers among Sub-Accounts of the Variable
Account, or from the Variable Account to the Fixed Account may be made only once
every six months and may not be  made during the first six months following  the
Income Starting Date.
 
    Transfers  may  be  made pursuant  to  telephone instructions  if  the Owner
completes the telephone authorization  form on the  application or another  form
provided  by the  Company. Telephone transfer  requests will be  accepted by the
Company if  received at  (800) 654-2397  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.
Otherwise, transfer  requests must  be in  writing, on  a form  provided by  the
Company.
 
    Transfers may also be made automatically through Dollar Cost Averaging prior
to the Income Starting Date. Dollar Cost Averaging permits the Owner to transfer
a  specified amount every month  from the Money Market  Sub-Account to any other
Sub-Account. Transfers made through Dollar Cost Averaging must be $100 or  more.
Dollar  Cost Averaging cannot be used to  transfer amounts to the Fixed Account.
Please consult with your Dean Witter Account Executive for detailed  information
about Dollar Cost Averaging.
 
    Transfers  from Sub-Accounts of  the Variable Account will  be made based on
the Accumulation  Unit  values next  computed  after the  Company  receives  the
transfer request at its home office.
 
   
    For transfers from the Fixed Account, see pg. 23.
    
 
SURRENDER AND WITHDRAWALS
 
   
    The  Owner may withdraw all or part of  the Contract Value at any time prior
to the earlier of the death of the Annuitant (and any Joint Annuitant), death of
any Owner or the  Income Starting 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, less any Surrender Charges, Contract  Maintenance
Charges or any remaining charge for 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,"  pg. 24.  For
withdrawals from the Fixed Account, see pg. 23.
    
 
    The  minimum partial withdrawal is $100. If  the Contract Value is less than
$500, or if the  Contract Value after  a partial withdrawal  would be less  than
$500,  then the Company will  treat the request as one  for a total surrender of
the Contract and the entire Contract Value, less any charges and premium  taxes,
will be paid out.
 
    Partial   withdrawals  may  also  be  taken  automatically  through  monthly
Automatic Income withdrawals.
 
                                       17
<PAGE>
Automatic Income withdrawals of $100 or more may be requested at any time  prior
to  the  Income Starting  Date.  Please consult  with  your Dean  Witter Account
Executive for detailed information about Automatic Income withdrawals.
 
    For Qualified Contracts,  the Company  will, at  the request  of the  Owner,
automatically  calculate  and withdraw  the  IRS Required  Minimum Distribution.
Please consult with your Dean Witter Account Executive for detailed  information
about the Required Minimum Distribution program.
 
   
    Withdrawals  and  surrenders may  be subject  to  income tax  and a  10% tax
penalty. This tax and penalty is explained in "Federal Tax Matters" on pg. 25.
    
 
    The full Contract Maintenance Charge will  be deducted at the time of  total
surrender  should  the  surrender  occur  on  any  date  other  than  a Contract
Anniversary. The total amount  paid at surrender  may be more  or less than  the
total Purchase Payments due to prior withdrawals, any deductions, and investment
performance.
    To  complete the partial  withdrawals, the Company  will cancel Accumulation
Units in an amount equal to the withdrawal and any Surrender Charge and  premium
taxes.  The Owner must name the Investment Alternative from which the withdrawal
is to be made. If none is  named, then the withdrawal request is incomplete  and
cannot be honored.
 
DEFAULT
    So  long as the Contract  Value is not reduced to  zero or a withdrawal does
not reduce it  to less  than $500,  the Contract will  stay in  force until  the
Income  Starting Date  even if  no Purchase  Payments are  made after  the first
Purchase Payment.
 
CHARGES AND OTHER DEDUCTIONS
- --------------------------------------------------------------------------------
 
DEDUCTIONS FROM PURCHASE PAYMENTS
    No deductions are currently made from Purchase Payments. Therefore the  full
amount of every Purchase Payment is invested in the Investment Alternative(s) to
increase the potential for investment gain.
 
CONTRACT MAINTENANCE CHARGE
    A  Contract Maintenance Charge of $30 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 INCREASE OVER THE LIFE OF  THE CONTRACT. Maintenance costs include but
are not  limited  to  expenses  incurred  in  billing  and  collecting  Purchase
Payments;  keeping records; processing death benefit claims and cash surrenders,
policy changes and 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,  the Contract  Maintenance  Charge  will  be
deducted  from  the  Investment Alternatives  in  the same  proportion  that the
Owner's interest in  each bears to  the total Contract  Value. After the  Income
Starting  Date, a pro rata share of  the annual Contract Maintenance Charge will
be deducted from each Income Payment. For example, 1/12 of the $30 or $2.50 will
be deducted if there  are twelve Income Payments  during the Contract Year.  The
Contract  Maintenance Charge will  be deducted from  the amount paid  on a total
surrender.
 
    Prior to October  4, 1993,  Vantage Computer Systems,  Inc. ("Vantage")  was
under  contract with the Company to  provide Contract recordkeeping services. As
of October 4, 1993, the Company provides all Contract recordkeeping services.
 
MORTALITY AND EXPENSE RISK CHARGE
    A Mortality and Expense Risk Charge will  be deducted daily at a rate  equal
on  an annual basis to 1.0% of the  daily net assets in the Variable Account and
will be reflected in the net interest  rate credited to the assets in the  Fixed
Account attributable to the Contracts. THE COMPANY GUARANTEES THAT THE AMOUNT OF
THIS  CHARGE WILL NOT INCREASE  OVER THE LIFE OF  THE CONTRACT. If the Mortality
and Expense Risk Charge is insufficient to cover the
 
                                       18
<PAGE>
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 distribution expenses.
 
    The mortality risk arises  from the Company's guarantee  to cover all  death
benefits  and to  make Income  Payments in  accordance with  the annuity tables,
thus, relieving the Annuitants  of the risk of  outliving funds accumulated  for
retirement.
 
    The  expense risk arises from the  possibility that the Contract Maintenance
and Surrender Charges,  both of which  are guaranteed not  to increase, will  be
insufficient to cover actual administrative expenses.
 
SURRENDER CHARGE (CONTINGENT DEFERRED SALES CHARGE)
    The  Owner may withdraw the  Contract Value any time  before the earliest of
the Income Start Date, the death of  any Owner or the Annuitant's and any  Joint
Annuitant's death.
    There are no Surrender Charges on the first withdrawal of each Contract Year
on  amounts up to the Free Withdrawal  Amount. The Free Withdrawal Amount is 10%
of the amount  of Purchase  Payments, excluding those  made less  than one  year
before the date of withdrawal. The maximum portion of the Free Withdrawal Amount
which  may be withdrawn from the Fixed Account is limited to the proportion that
your value in  the Fixed  Account bears to  your total  Contract Value.  Amounts
surrendered  in  excess  of the  Free  Withdrawal  Amount may  be  subject  to a
Surrender Charge. Free Withdrawal  Amounts not withdrawn in  a Contract Year  do
not  increase  the Free  Withdrawal Amount  in  later Contract  Years. Surrender
Charges, if applicable, will be deducted from the amount paid.
 
    In certain cases, distributions required  by federal tax law (see  Statement
of Additional Information for "IRS Required Distribution at Death Rules") may be
subject  to a  Surrender Charge.  Income Payments  under Annuity  Options with a
specified period of less than 120 months will be subject to a Surrender Charge.
 
    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  Surrender  Charge,  Purchase   Payments  shall  include  any  earnings
attributable to those payments.
 
    A Surrender Charge will be applied to amounts withdrawn in excess of a  Free
Withdrawal Amount as set forth below:
 
<TABLE>
<CAPTION>
                                               APPLICABLE
             ELAPSED TIME SINCE                SURRENDER
           PURCHASE PAYMENT BEING                CHARGE
             WITHDRAWN WAS MADE                PERCENTAGE
- --------------------------------------------  ------------
<S>                                           <C>
Less than 1 year............................       6%
1 year, but less than 2 years...............       5%
2 years, but less than 3 years..............       4%
3 years, but less than 4 years..............       3%
4 years, but less than 5 years..............       2%
5 years, but less than 6 years..............       1%
6 years or more.............................       0%
</TABLE>
 
                                       19
<PAGE>
    The  cumulative total of all Surrender Charges is guaranteed never to exceed
7% of an Owner's Purchase Payments (not including earnings attributable to those
payments).
 
    Surrender  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 Surrender Charges will cover
all distribution expenses in connection with the Contract.
 
   
    In addition, federal and  state income tax may  be withheld from  withdrawal
and  surrender amounts. Certain surrenders may also  be subject to a federal tax
penalty. See "Federal Tax Matters," pg. 25.
    
 
TAXES
 
    The Company will  deduct any  state premium  taxes incurred  or other  taxes
incurred  relative to the Contract (collectively referred to as "premium taxes")
either (1) at  the Income  Starting Date,  or (2)  when a  partial surrender  in
excess of the Free Withdrawal Amount occurs (in which case a pro rata portion of
the  premium taxes will be  deducted from the amount paid),  or (3) when a total
surrender occurs. Current premium  tax rates range from  0 to 3.5%. The  Company
reserves  the  right to  deduct  any incurred  premium  taxes from  the Purchase
Payments.
 
    At the Income Starting Date, any  charge for premium taxes will be  deducted
from  each Investment Alternative in the proportion that the Owner's interest in
the Investment Alternative bears to the total Contract Value.
 
DEAN WITTER VARIABLE INVESTMENT SERIES
("FUND") EXPENSES
 
    A complete description of  the expenses and  deductions from the  Portfolios
are found in the Fund's prospectus which is attached to this prospectus.
 
BENEFITS UNDER THE CONTRACT
- --------------------------------------------------------------------------------
 
DEATH BENEFITS PRIOR TO THE INCOME STARTING DATE
 
    If  any Owner or the Annuitant dies prior to the Income Starting Date, and a
Death Benefit is elected, it  will be paid to  the Beneficiary. If a  Contingent
Annuitant  survives the Annuitant  or Joint Annuitant, no  Death Benefit will be
paid unless  the Contingent  Annuitant dies  before the  earlier of  the  Income
Starting  Date or the day on which  the Contract Value must be distributed under
the IRS Required Distribution Rules (see below). (For purposes of payment of the
Death Benefit, the  Joint Annuitant must  have been named  prior to January  19,
1985).  The Death Benefit  will be the greater  of: (a) the  sum of all Purchase
Payments less  any  amounts deducted  in  connection with  partial  withdrawals,
including any Surrender Charges; or (b) the Contract Value.
 
    The  Company will not pay  any Death Benefit until  it receives Due Proof of
Death. Generally, the  Beneficiary may  elect an Annuity  Option or  a lump  sum
payment  within 180 days  after the Company  receives Due Proof  of Death. If no
election is received within 180 days, a lump sum will be paid automatically.
 
    The value  of  the Death  Benefit  will be  determined  at the  end  of  the
Valuation  Period during which  the Company receives  the later of  Due Proof of
Death and an election for either a lump sum payment or an Annuity Option.
 
DEATH BENEFITS AFTER THE INCOME STARTING DATE
 
    If any Owner, who is not the Annuitant, dies after the Income Starting Date,
payments will  continue  to  be  made under  the  particular  income  plan.  The
Beneficiary will be the recipient of any such payments.
 
    If  the Annuitant and  Joint Annuitant, if applicable,  die after the Income
Starting Date, the Company will pay the Death Benefit, if any, contained in  the
particular Annuity Option elected.
 
                                       20
<PAGE>
INCOME PAYMENTS
- --------------------------------------------------------------------------------
 
INCOME STARTING DATE
 
    The  Income Starting Date is  the day that Income  Payments will start under
the Contract. The  Owner may  change the  Income Starting  Date at  any time  by
notifying  the Company  in writing  of the  change at  least 30  days before the
current Income Starting Date. The  Income Starting Date must  be (a) at least  a
month  after the Issue Date; (b)  the first day of a  calendar month; and (c) no
later than the first day of the  calendar month after the Annuitant reaches  age
85, or the 10th anniversary date, if later.
 
    Unless  the  Owner notifies  the Company  in  writing otherwise,  the Income
Starting Date will be: for Non-Qualified Contracts the later of the first day of
the calendar month after  the Annuitant reaches age  85 or the 10th  anniversary
date;  for Qualified Contracts,  April first of the  calendar year following the
year in which the Annuitant reaches age 70 1/2.
 
AMOUNT OF VARIABLE ANNUITY INCOME PAYMENTS
 
    The amount of Variable Annuity  Income Payments depends upon the  investment
experience  of the Portfolios selected by the  Owner, any premium taxes, the age
and sex  of  the  Annuitant(s),  and the  Annuity  Option  chosen.  The  Company
guarantees that the Income Payments will not be affected by (1) actual mortality
experience and (2) amount of the Company's administration expenses.
 
    The  Contracts offered  by this prospectus  (except in  states which require
unisex annuity tables) contain  life annuity tables  that provide for  different
benefit  payments to men and women of  the same age. 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 may  be  used. Accordingly,  if  the Contract  is  to be  used in
connection with an employment-related retirement or benefit plan,  consideration
should  be given, in consultation with legal counsel, to the impact of NORRIS on
any such plan before making any contributions under these Contracts.
 
    The sum of  Income Payments  may be  more or  less than  the total  Purchase
Payments  made  because  (a)  Variable Annuity  Income  Payments  vary  with the
investment results  of  the  underlying  Portfolios; (b)  the  Owner  bears  the
investment  risk with respect to all  amounts allocated to the Variable Account,
and (c) Annuitants  may die before  the actuarially expected  date of death.  As
such, the total amount of Income Payments cannot be predicted.
 
    The  duration of the  Annuity Option may  affect the dollar  amounts of each
Income Payment. For example, if an Annuity Option guaranteed for life is chosen,
the Income Payments may be greater or less than Income Payments under an Annuity
Option for a specified period depending on the life expectancy of the Annuitant.
 
    If the actual net investment experience is less than the assumed  investment
rate,  then the dollar amount of the  annuity payments will decrease. The dollar
amount of the annuity payments will stay level if the net investment  experience
equals the assumed investment rate and the dollar amount of the annuity payments
will  increase if the  net investment experience  exceeds the assumed investment
rate. For  purposes  of  the  Variable  Annuity  Income  Payments,  the  assumed
investment rate is 4%.
 
    If  the  Contract Value  to be  applied to  an Annuity  Option is  less than
$2,000, or if the monthly payments determined under the Annuity Option are  less
than  $20, the Company  may pay the Contract  Value in a lump  sum or change the
payment frequency to an  interval which results in  Income Payments of at  least
$20.
 
ANNUITY OPTIONS
 
    The  Owner  may  elect a  completely  Fixed Annuity,  a  completely Variable
Annuity or a combination Fixed  and Variable Annuity. Up  to 30 days before  the
Income  Starting Date, the  Owner may change  the Annuity Option  or request any
other form of annuity  agreeable to both the  Company and the Owner.  Subsequent
changes will not be permitted. If an Annuity
 
                                       21
<PAGE>
Option is chosen which depends on the Annuitant or Joint Annuitant's life, proof
of  age will  be required  before Income  Payments begin.  Premium taxes  may be
assessed. The Annuity Options include:
 
    ANNUITY OPTION 1 -- LIFE WITH PAYMENTS GUARANTEED FOR 120 MONTHS.
 
    Monthly payments will be  made for as  long as the  Annuitant lives. If  the
Annuitant  dies before 120 monthly payments have been made, the remainder of the
120 guaranteed monthly payments will  be paid to the  Owner, or if deceased,  to
the surviving Beneficiary.
 
    ANNUITY OPTION 2 -- JOINT AND LAST SURVIVOR
 
    Monthly  payments beginning on the Income Starting  Date will be made for as
long as either the Annuitant or Joint Annuitant is living. It is possible  under
this  option that  only one monthly  payment will  be made if  the Annuitant and
Joint Annuitant both die before the second payment is made, or only two  monthly
payments will be made if they both die before the third payment, and so forth.
 
    ANNUITY OPTION 3 -- PAYMENTS FOR A SPECIFIED PERIOD
 
    Monthly  payments beginning on the Income Starting Date will be made for any
specified period of at  least 120 months.  A Surrender Charge  may apply if  the
specified  period is  less than  120 months. Payments  under this  option do not
depend on the continuation of the Annuitant's life. If the Owner dies before the
end of  the  specified  period, the  remaining  payments  will be  paid  to  the
surviving  Beneficiary. The Mortality  and Expense Risk  Charge is deducted from
the Variable Account even though the  Company does not bear any mortality  risk.
If  Annuity Option 3  is chosen and  the proceeds are  derived from the Variable
Account, the Owner  or Beneficiary  may surrender the  Contract at  any time  by
notifying the Company in writing.
 
    In  the event that an Annuity Option  is not selected, the Company will make
Income  Payments  in  accordance  with  Annuity  Option  1.  At  the   Company's
discretion,  other Annuity  Options 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 annuity  tables
which do not distinguish on the basis of sex.
 
THE FIXED ACCOUNT
- --------------------------------------------------------------------------------
 
    CONTRIBUTIONS  UNDER THE FIXED PORTION OF THE ANNUITY CONTRACT AND TRANSFERS
TO THE FIXED PORTION BECOME  PART OF THE GENERAL  ACCOUNT OF THE COMPANY,  WHICH
SUPPORTS   INSURANCE  AND   ANNUITY  OBLIGATIONS.   BECAUSE  OF   EXEMPTIVE  AND
EXCLUSIONARY  PROVISIONS,  INTERESTS  IN  THE  GENERAL  ACCOUNT  HAVE  NOT  BEEN
REGISTERED  UNDER THE SECURITIES  ACT OF 1933  ("1933 ACT"), NOR  IS THE GENERAL
ACCOUNT REGISTERED AS AN INVESTMENT COMPANY UNDER THE INVESTMENT COMPANY ACT  OF
1940  ("1940 ACT"). ACCORDINGLY,  NEITHER THE GENERAL  ACCOUNT NOR ANY INTERESTS
THEREIN ARE GENERALLY SUBJECT TO THE PROVISIONS OF THE 1933 OR 1940 ACTS AND THE
COMPANY HAS  BEEN  ADVISED  THAT  THE  STAFF  OF  THE  SECURITIES  AND  EXCHANGE
COMMISSION  HAS NOT REVIEWED THE DISCLOSURES  IN THIS PROSPECTUS WHICH RELATE TO
THE FIXED  PORTION.  DISCLOSURES REGARDING  THE  FIXED PORTION  OF  THE  ANNUITY
CONTRACT  AND THE GENERAL ACCOUNT, HOWEVER,  MAY BE SUBJECT TO CERTAIN GENERALLY
APPLICABLE PROVISIONS OF THE  FEDERAL SECURITIES LAWS  RELATING TO THE  ACCURACY
AND COMPLETENESS OF STATEMENTS MADE IN PROSPECTUSES.
 
GENERAL DESCRIPTION
 
    The  Fixed Account is made  up of all of the  general assets of the Company,
other than those in the Variable Account and any other segregated asset account.
Instead of the Owner bearing the investment  risk as is the case for amounts  in
the Variable Account, the Company bears the full investment risk for all amounts
in  the Fixed Account. The  Company has sole discretion  to invest the assets of
the   Fixed    Account,    subject    to    applicable    law.    The    Company
 
                                       22
<PAGE>
guarantees  that the  amounts allocated  to the  Fixed Account  will be credited
interest at a net effective interest rate  of at least 4.0% per year.  Currently
the  amount  of  investment income  in  excess  of 4.0%  allocated  to contracts
participating in the Fixed Account will vary periodically in the sole discretion
of the Company. Any interest held in the Fixed Account does not entitle an Owner
to share in the investment experience of the Fixed Account.
 
    The Company has revised  the Fixed Account. Money  deposited in the  revised
Fixed  Account  earns interest  at the  current rate  in effect  at the  time of
allocation or transfer until the first  renewal date. The first renewal date  is
January  1  following the  date of  the  allocation or  transfer into  the Fixed
Account. Subsequent renewal dates will be on anniversaries of the first  renewal
date.  On or about each  renewal date, the Company will  notify the Owner of the
interest rate(s) for the calendar year then starting. This interest rate will be
guaranteed by the Company for  the calendar year and will  not be less than  4%.
The  Company may declare more than one  interest rate for different monies based
upon the date of allocation or transfer to the Fixed Account.
 
    ANY INTEREST CREDITED TO AMOUNTS ALLOCATED TO THE FIXED ACCOUNT IN EXCESS OF
THE GUARANTEED RATE OF 4.0% PER YEAR  WILL BE DETERMINED IN THE SOLE  DISCRETION
OF THE COMPANY.
 
TRANSFERS, SURRENDERS, AND WITHDRAWALS
    Amounts  may be transferred from the Sub-Accounts of the Variable Account to
the Fixed Account, and  prior to the  Income Starting Date  amounts may also  be
transferred  from the Fixed Account to  Sub-Accounts of the Variable Account. No
charge will ever be imposed for such transfers.
 
    Prior to the Income Starting Date,  amounts may not be transferred from  the
Variable Account to the Fixed Account until thirty days after the Issue Date and
may  be transferred  thereafter only  once every  thirty days.  However, amounts
invested in the Fixed Account prior to  the date that the revised Fixed  Account
became  available may not be transferred from the Fixed Account until six months
after the Issue Date and those amounts may be transferred only every six months.
The maximum amount which  may be transferred from  the revised Fixed Account  to
the Variable Account is limited to 25% of the value in the revised Fixed Account
as  of December 31  of the prior  calendar year (except  with respect to amounts
which were allocated to the Fixed Account prior to the date of availability).
 
    If the first renewal interest rate is less than the current rate that was in
effect at  the time  money was  allocated or  transferred to  the revised  Fixed
Account,  the  transfer restriction  for that  money will  be waived  during the
60-day period following the first renewal date.
 
    After the  Income Starting  Date no  transfers may  be made  from the  Fixed
Account.  Transfers from the  Variable Account to  the Fixed Account  may not be
made for six months after  the Income Starting Date  and may be made  thereafter
only once every six months. The Company reserves the right to waive restrictions
on transfers that are contained in the Contract.
 
    Surrenders  and withdrawals from the Fixed Account  may be delayed for up to
six months. After the Income Starting Date, no surrenders or withdrawals may  be
made from the Fixed Account.
 
                                       23
<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.
 
    Generally,  an Owner who is  not a natural person  is required to include in
income each year any increase  in the cash value to  the extent the increase  is
attributable to contributions to the Contract made after February 28, 1986.
 
BENEFICIARY
    The  Beneficiary can mean either the  Owner's Beneficiary or the Annuitant's
Beneficiary, but not both at the same time. Subject to the terms of any existing
assignment or the rights  of any irrevocable Beneficiary,  the Owner may  change
the Owner's Beneficiary or Annuitant's Beneficiary while the Annuitant is living
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, the rights of any
Beneficiary predeceasing the Annuitant will revert  to the Owner or the  Owner's
estate.  Multiple Beneficiaries may  be named. Unless  otherwise provided in the
Beneficiary designation, if  more than one  Beneficiary survives the  Annuitant,
the surviving Beneficiaries will share equally in any amounts due.
 
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 security holders.
 
    For payment or transfers from the Fixed Account, see pg. 23.
 
ASSIGNMENTS
    The contract may be  assigned prior to the  Income Starting Date and  during
the  Annuitant's or, if  applicable, Joint Annuitant's  lifetime, subject to the
rights of any irrevocable Beneficiary. Any assignment will not be binding  until
received  in writing  by the  Company. The Company  will not  be responsible for
deciding if an assignment is valid or  the extent of an assignee's interest.  An
assignment may result in income tax liability to the owner.
 
    No  Beneficiary may  assign benefits under  the Contract until  they are due
and, to the extent permitted  by law, payments are not  subject to the debts  of
any  Beneficiary or  to any  judicial process  for payment  of the Beneficiary's
debts.
 
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 required by the Code or by any other applicable law in order to continue
treatment of the Contract as an annuity.
 
CUSTOMER INQUIRIES
    The Owners or  any persons  interested in  the Contract  may make  inquiries
regarding  the  Contract  by  calling  or  writing  their  Dean  Witter  Account
Executive.
 
                                       24
<PAGE>
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 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  ("Treasury")
regulations and (3) the Company, instead of the annuity Owner, is considered the
Owner of the Variable Account assets for federal income tax purposes.
 
NON-NATURAL OWNERS
 
    As  a general  rule, annuity Contracts  owned by nonnatural  persons 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  Contract 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 Fund or its investments,  the Company expects the Fund to meet
the diversification requirements.
 
INVESTOR CONTROL
 
    In  connection  with  the  issuance  of  the  regulations  on  the  adequate
diversification  standards,  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. 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 Contract Owner  from being considered the  federal tax owner of  the
assets of the Variable Account.
 
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. 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 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
 
                                       25
<PAGE>
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 pledge) of  the Contract Value is treated  as a withdrawal of such
amount or portion.
 
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.
 
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; or (4) made under an immediate annuity. Similar rules apply for
distributions  under certain  Qualified Contracts.  Please see  the Statement of
Additional Information for a discussion of other situations in which the penalty
tax may not apply.
 
AGGREGATION OF ANNUITY CONTRACTS
 
    All  Non-Qualified  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 the  account of hardship
(earnings on  salary  reduction contributions  may  not be  distributed  on  the
account of hardship).
 
                                       26
<PAGE>
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.
 
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. The  Company will  solicit and  cast each  vote according  to the
procedures set up by  the Fund 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.
 
    Before the Income Starting Date, the Owner holds the voting interest in  the
Sub-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 Portfolio.)
 
    After the Income Starting Date, the person receiving Income Payments has the
voting  interest. After the  Income Starting 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 Portfolio.
 
SALES COMMISSION
- --------------------------------------------------------------------------------
 
    From  its profits the Company may pay a maximum sales commission of 5.75% of
Purchase Payments and an annual sales administration expense allowance of up  to
0.125%  of the average net  assets of the Fixed  Account to Dean Witter Reynolds
Inc., the principal underwriter of the Contracts. Dean Witter will pay  annually
to  its Account Executives from its profits, an  amount equal to .10% of the net
assets of the Variable Account attributable  to Contracts issued and sold  after
1984 and any subsequent additions thereon.
 
                                       27
<PAGE>
                      STATEMENT OF ADDITIONAL INFORMATION
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        -----
<S>                                                                                  <C>
Introduction.......................................................................           3
    Northbrook Life Insurance Company..............................................           3
    Dean Witter Reynolds Inc.......................................................           3
    Additions, Deletions or Substitutions of Investments...........................           3
    Reinvestment...................................................................           3
The Contract.......................................................................           3
    Value of Variable Account Accumulation Units...................................           3
    Performance Data...............................................................           4
Standardized Total Returns.........................................................           5
    Other Total Returns............................................................           5
    Transfers......................................................................           5
    Tax-Free Exchanges (1035 Exchanges, Rollovers and Transfers)...................           6
General Matters....................................................................           6
    Incontestability...............................................................           6
    Settlements....................................................................           6
    Safekeeping of the Variable Account's Assets...................................           6
    Experts........................................................................           6
    Legal Matters..................................................................           6
Federal Tax Matters................................................................           7
    Introduction...................................................................           7
    Taxation of Northbrook Life Insurance Company..................................           7
    Exceptions to the Non-Natural Owner Rule.......................................           7
    Penalty Tax on Premature Distributions.........................................           7
    IRS Required Distribution at Death Rules.......................................           8
    Qualified Plans................................................................           8
    Types of Qualified Plans.......................................................           8
        Individual Retirement Annuities............................................           8
        Simplified Employee Pension Plans..........................................           8
        Tax Sheltered Annuities....................................................           8
        Corporate & Self-Employed & Pension & Profit Savings Plan..................           8
        State & Local Government & Tax-Exempt Organization Deferred Compensation
         Plans.....................................................................           9
Voting Rights......................................................................           9
Sales Commissions..................................................................           9
Financial Statements...............................................................         F-1
</TABLE>
    
 
                                       28
<PAGE>
                                   ORDER FORM
 
   
/ / Please send me a copy of the most recent Statement of Additional Information
    for the Northbrook Variable Annuity.
    
 
<TABLE>
<S>                       <C>
- ------------------------  ---------------------------------------------
         (Date)                               (Name)
 
                          ---------------------------------------------
                                         (Street Address)
 
                          ---------------------------------------------
                          (City)           (State)           (Zip Code)
</TABLE>
 
Send to:  Northbrook Life Insurance Company
          P.O. Box 94040
          Palatine, IL 60094-4040
 
          Attn:  Annuity Services
 
                                       29
<PAGE>
                      STATEMENT OF ADDITIONAL INFORMATION
 
                      NORTHBROOK VARIABLE ANNUITY ACCOUNT
 
                                       OF
 
                       NORTHBROOK LIFE INSURANCE COMPANY
                                 P.O. BOX 94040
                            PALATINE, IL 60094-4040
 
                     INDIVIDUAL VARIABLE ANNUITY CONTRACTS
 
                                 DISTRIBUTED BY
 
                           DEAN WITTER REYNOLDS INC.
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                              -------------------
 
    This  Statement of Additional Information supplements the information in the
Prospectus for the Flexible
Premium Deferred Variable  Annuity Contract ("Contract")  offered by  Northbrook
Life  Insurance 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.
 
THIS STATEMENT OF ADDITIONAL INFORMATION IS NOT A PROSPECTUS AND SHOULD BE READ
           ONLY IN CONJUNCTION WITH THE PROSPECTUS FOR THE CONTRACT.
 
    YOU  MAY OBTAIN  A COPY  OF THE  PROSPECTUS FROM  DEAN WITTER  REYNOLDS INC.
("DEAN WITTER"), THE PRINCIPAL UNDERWRITER  AND DISTRIBUTOR OF THE CONTRACT,  BY
CALLING OR WRITING DEAN WITTER AT THE ADDRESS LISTED ABOVE.
 
    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>
Introduction..............................................................................          3
    Northbrook Life Insurance Company.....................................................          3
    Dean Witter Reynolds Inc..............................................................          3
      Additions, Deletions or Substitutions of Investments................................          3
      Reinvestment........................................................................          3
The Contract..............................................................................          3
    Value of Variable Account Accumulation Units..........................................          3
    Performance Data......................................................................          4
    Transfers.............................................................................          5
    Tax-Free Exchanges (1035).............................................................          6
General Matters...........................................................................          6
    Incontestability......................................................................          6
    Settlements...........................................................................          6
    Safekeeping of the Variable Account's Assets..........................................          6
    Experts...............................................................................          6
    Legal Matters.........................................................................          6
Federal Tax Matters.......................................................................          7
    Introduction..........................................................................          7
    Taxation of Northbrook Life Insurance Company.........................................          7
    Exceptions to the Non-Natural Owner Rule..............................................          7
    Penalty Tax on Premature Distributions................................................          7
    IRS Required Distribution at Death Rules..............................................          8
    Qualified Plans.......................................................................          8
Types of Qualified Plans..................................................................          8
    Individual Retirement Annuities.......................................................          8
    Simplified Employee Pension Plans.....................................................          8
    Tax Sheltered Annuities...............................................................          8
    Corporate and Self-Employed Pension and Profit Sharing Plans..........................          8
    State and Local Government and Tax-Exempt Organization Deferred Compensation Plans....          9
Voting Rights.............................................................................          9
Sales Commissions.........................................................................          9
Financial Statements......................................................................        F-1
</TABLE>
    
 
                                       2
<PAGE>
INTRODUCTION
- --------------------------------------------------------------------------------
 
NORTHBROOK LIFE INSURANCE COMPANY
 
    Incorporated in 1978 as a life insurance company under the laws of the State
of Illinois, Northbrook  Life Insurance  Company ("Company")  has done  business
continuously  since  that  time  as  "Northbrook  Life  Insurance  Company." The
Company's products, annuities and individual life insurance, have been  approved
by the various states where offered.
 
DEAN WITTER REYNOLDS INC.
 
    Dean  Witter Reynolds Inc. ("Dean Witter")  is the principal underwriter and
distributor of the Contracts. Dean Witter  is a wholly-owned subsidiary of  Dean
Witter,  Discover & Co.  Dean Witter is  located at Two  World Trade Center, New
York, New York Dean Witter  is a member of the  New York Stock Exchange and  the
National  Association  of Securities  Dealers,  Inc., and  its  subsidiary, Dean
Witter InterCapital, Inc.  ("InterCapital"), is registered  with the  Securities
and Exchange Commission as an investment advisor.
 
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 Portfolio shares held  by
any  Sub-Account  of the  Variable Account.  The Company  reserves the  right to
eliminate the  shares of  any of  the  Portfolios and  to substitute  shares  of
another  Portfolio of  the Fund, or  of another  open-end, registered investment
company, if the shares of the Portfolio are no longer available for  investment,
or  if,  in the  Company's judgment,  investment in  any Portfolio  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  of  the Variable
Account. Each additional Sub-Account would purchase shares in a new Portfolio of
the Fund 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 will be made available to existing Contract 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  Portfolios  are
automatically  reinvested in shares  of the distributing  Portfolio at their net
asset value.
 
THE CONTRACT
- --------------------------------------------------------------------------------
 
VALUE OF VARIABLE ACCOUNT ACCUMULATION UNITS
 
    The value of  Variable Account  Accumulation Units will  vary in  accordance
with  investment experience of  the Portfolio in  which the Sub-Account invests.
The number of such Accumulation Units credited to a Contract will not,  however,
change as a
 
                                       3
<PAGE>
result of any fluctuations in the value of the Accumulation Unit.
 
    The  Accumulation  Units in  each Sub-Account  of  the Variable  Account are
valued separately. The value of Accumulation Units in any Valuation Period  will
depend  upon  the  investment  performance  of  the  shares  purchased  by  each
Sub-Account in a particular Portfolio.
 
    The value of an Accumulation Unit in a Sub-Account for any Valuation  Period
equals  the value of such 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  each  Sub-Account  for any
Valuation Period  is determined  by dividing  (A) by  (B) and  subtracting  (C),
where:
 
    (A) is the sum of:
 
        (1)  the net  asset value per  share of the  Portfolio(s) underlying the
    Sub-Account determined at the end of the current valuation period; plus,
 
        (2) the per share amount of  any dividend or capital gain  distributions
    made  by  the Portfolio(s)  underlying  the Sub-Account  during  the current
    valuation period.
 
        (B) is the net asset value per share of the Portfolio(s) underlying  the
    Sub-Account  determined as of the end of the immediately preceding valuation
    period.
 
        (C) is the annualized Mortality and Expense Risk Charges divided by  365
    and  then multiplied by the number of calendar days in the current valuation
    period.
 
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  Money  Market Sub-Account)  will  always be
accompanied by total return quotations.
 
    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 will result  in the ending redeemable
value of a hypothetical $1,000 Purchase Payment made at the beginning of a  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 formula  for
computing  the average  annual total  return involves  a percentage  obtained by
dividing the ending  redeemable value,  including deductions  for any  Surrender
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  Surrender Charges assessed on this redemption were computed as follows.
For Contracts  that  have passed  their  first Contract  Anniversary,  the  Free
Withdrawal  Amount is  not assessed  a Surrender  Charge. Surrender  Charges are
charged on the amount of redemption equal to the value of the Purchase  Payment,
reduced  by the  Free Withdrawal Amount,  if any. The  Surrender Charge schedule
specifies one rate for  less than one  year and another rate  for one year,  but
less  than two years, and another rate for two years, but less than three years,
and so on until six years or more.  For a one year total return calculation  the
second  rate (i.e., one year, but less than two years) is assessed. The Contract
Maintenance Charge ($30 per  contract) used in the  total return calculation  is
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 initial
hypothetical $1,000 Purchase Payment.
 
    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 may  or may  not reflect  the
deductions  of some or all of the 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
 
                                       4
<PAGE>
total  return  quotations  involves  a  percent  unit  change  calculation. This
calculation is 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   may  include  among   others
"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";  and  "Inception  (commencement  of the
Sub-Account's operation) to-date" (day of the advertisement).
 
   
STANDARDIZED TOTAL RETURNS
    
- --------------------------------------------------------------------------------
 
   
    The standardized average annual total  returns for the Sub-Accounts for  the
one-year, five-year and ten year or since inception periods are presented below:
    
 
   
<TABLE>
<CAPTION>
                                            10-YEARS OR
                                          SINCE INCEPTION*
SUB-ACCOUNT         ONE-YEAR  FIVE-YEAR      (IF LESS)
- ----------------------------- --------- --------------------
<S>                 <C>       <C>       <C>
Capital Growth......   25.44%    N/A                  8.52%
Dividend Growth.....   28.70%    14.39%              10.49%
Equity..............   34.48%    19.42%              12.36%
European Growth.....   18.83%    N/A                 14.06%
Global Dividend
 Growth.............   15.21%    N/A                  7.57%
High Yield..........    8.59%    19.74%               6.71%
Money Market........    N/A      N/A           N/A
Pacific Growth......   (0.13)%    N/A                (4.24)%
Quality Income
 Plus...............   17.39%     9.60%               8.40%
Strategist..........    3.31%    10.16%               8.27%
Utilities...........   21.42%    11.55%              10.50%
</TABLE>
    
 
   
*The  Money Market,  High Yield and  Equity Sub-Accounts  commenced operation on
 March 9, 1984. The  Quality Income Plus  and Strategist Sub-Accounts  commenced
 operation  on March  1, 1987.  The Utilities  and Dividend  Growth Sub-Accounts
 commenced operation on March  1, 1990. The Capital  Growth and European  Growth
 Sub-Accounts  commenced operation on March 1,  1991. The Global Dividend Growth
 and Pacific Growth Sub-Accounts commenced operation on February 23, 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.
    
 
   
    Such  average  annual total  return  information for  the  Sub-Accounts (not
including deduction of the Surrender Charge) is as follows:
    
 
   
<TABLE>
<CAPTION>
                                            10-YEARS OR
                                          SINCE INCEPTION*
SUB-ACCOUNT         ONE-YEAR  FIVE-YEAR      (IF LESS)
- ----------------------------- --------- --------------------
<S>                 <C>       <C>       <C>
Capital Growth......   31.60%    N/A                  9.02%
Dividend Growth.....   35.03%    14.67%              10.74%
Equity..............   41.12%    19.71%              12.42%
European Growth.....   24.64%    N/A                 14.57%
Global Dividend
 Growth.............   20.83%    N/A                 10.42%
High Yield..........   13.87%    20.02%               6.79%
Money Market........    N/A      N/A           N/A
Pacific Growth......    4.69%    N/A                 (1.74)%
Quality Income
 Plus...............   23.12%     9.88%               8.46%
Strategist..........    8.31%    10.43%               8.33%
Utilities...........   27.37%    11.83%              10.74%
</TABLE>
    
 
   
*The Money Market,  High Yield  and Equity Sub-Accounts  commenced operation  on
 March  9, 1984. The  Quality Income Plus  and Strategist Sub-Accounts commenced
 operation on  March 1,  1987. The  Utilities and  Dividend Growth  Sub-Accounts
 commenced  operation on March  1, 1990. The Capital  Growth and European Growth
 Sub-Accounts commenced operation on March  1, 1991. The Global Dividend  Growth
 and Pacific Growth Sub-Accounts commenced operation on February 23, 1994.
    
 
    The  Variable Account may also advertise the performance of the Sub-Accounts
relative to certain  performance rankings  and indexes  compiled by  independent
organizations.
 
TRANSFERS
 
    Currently  the Company  is not  enforcing certain  restrictions on transfers
and, therefore, prior to the Income Starting Date amounts may be transferred out
of Sub-Accounts of  the Variable Account  at any time.  The restrictions in  the
Contracts, which could be
 
                                       5
<PAGE>
enforced  in  the  future,  provide that  transfers  among  Sub-Accounts  of the
Variable Account, or from the Variable Account to the Fixed Account, may not  be
made  for the  first 30 days  after the  Contract is issued  and thereafter such
transfers may occur only once every 30  days. The Company reserves the right  to
enforce  these  restrictions in  the future.  However,  the Company  will notify
Owners at least 30 days prior to enforcing these restrictions.
 
TAX-FREE EXCHANGES (SECTION 1035)
 
    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-1035 Purchase Payments.
 
    The  Company  also   accepts  "rollovers"  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 between  non-qualified Contracts  and TSAs and
IRAs 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.
 
GENERAL MATTERS
- --------------------------------------------------------------------------------
 
INCONTESTABILITY
 
    The Contract will not be contested after it is issued.
 
SETTLEMENTS
 
    The Contract must be  returned to the Company  prior to any settlement.  Due
proof  of any Owner's or  Annuitant's (and any Joint  Annuitant's) death 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 Portfolio shares held by each of the Sub-Accounts.
 
    The   Dean  Witter  Variable  Investment  Series  ("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 Fund's custodian.
 
EXPERTS
 
    The  financial  statements  of  the  Variable  Account  and  the   financial
statements  and financial  statement schedule of  the Company  appearing in this
Statement of Additional Information (which  is incorporated by reference in  the
prospectus  of Northbrook Variable Annuity  Account of Northbrook Life Insurance
Company) have been audited by Deloitte  & Touche LLP, Two Prudential Plaza,  180
N.  Stetson Avenue, Chicago, Illinois, independent  auditors, as stated in their
reports appearing herein and are included  in reliance upon the reports of  such
firm given upon their authority as experts in accounting and auditing.
 
LEGAL MATTERS
 
    Certain  legal matters relating to the federal securities laws applicable to
the issue  and sale  of  the Contracts  have been  passed  upon by  Routier  and
Johnson, P.C., of Washington, D.C. 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 Northbrook Life Insurance Company.
 
                                       6
<PAGE>
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 NORTHBROOK LIFE INSURANCE COMPANY
 
    The  Company is taxed as a life insurance company under Part I of Subchapter
L of  the Internal  Revenue  Code. The  following  discussion assumes  that  the
Company is taxed as a life insurance company under Part I of Subchapter L. 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.
 
PENALTY TAX ON PREMATURE DISTRIBUTIONS
 
    There is a 10%  penalty tax on  the taxable amount  of any payment  received
from  a non-qualified annuity contract unless:  (1) made after the owner reaches
59 1/2;  (2)  attributable  to  the  owner's  disability;  (3)  attributable  to
investment  before August  14, 1982, including  earnings on  pre-August 14, 1982
investment; (4) made from certain qualified contracts; (5) made after the  death
of  the owner; (6)  made under an  immediate annuity contract;  (7) made from an
annuity purchased and held  by an employer upon  the termination of a  qualified
retirement plan; (8) made under a qualified funding asset; (9) made as part of a
series  of  substantially  equal  periodic payments  (not  less  frequently than
annually) for the life of or life expectancy of the owner or the joint lives  of
joint  life expectancies of the owner  and designated beneficiary. Similar rules
apply in the case of qualified contracts.
 
                                       7
<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.
 
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.
 
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 in the case of hardship (earnings on salary reduction contributions
may not be distributed for hardship).
 
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.
 
                                       8
<PAGE>
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. Generally, under the non-natural owner rules, such  contracts
are not treated as annuity contracts for federal income tax purposes.
 
VOTING RIGHTS
- --------------------------------------------------------------------------------
 
    The  number  of votes  which  a person  has the  right  to instruct  will be
calculated separately for each  Sub-Account. That number  will be determined  by
applying his/her percentage interest, if any, in a particular Sub-Account to the
total number of votes attributable to the Sub-Account.
 
    The  number of votes of the Portfolio which an Owner has a right to instruct
will be determined as of the date  coincident with the date established by  that
Portfolio  for determining shareholders  eligible to vote at  the meeting of the
Fund. Voting instructions will  be solicited by  written communication prior  to
such meeting in accordance with procedures established by the Fund.
 
    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.
 
    Each person having  a voting interest  in a Sub-Account  will receive  proxy
material, reports and other materials relating to the appropriate Portfolio.
 
SALES COMMISSIONS
- --------------------------------------------------------------------------------
 
    The  Company  pays  Dean Witter  for  its underwriting  and  general agent's
services a sales commission of  up to 5.75% of  the Purchase Payments and  sales
administration  expense allowance of up  to 0.125% of the  Average Net Assets of
the Fixed  Account.  These  commissions  are intended  to  cover  Dean  Witter's
expenses in distributing and selling the Contracts.
 
    Under  the  Underwriting Agreement  and  Managing General  Agent's Agreement
between Dean Witter and the Company, Dean Witter is responsible for paying costs
and expenses associated with licensing  its agents, paying agent's  commissions,
printing, mailing and distributing the Prospectus to prospective purchasers; and
preparing,  printing  and  distributing  sales  literature.  In  the  event  the
commissions fail to adequately compensate  Dean Witter for these expenses,  Dean
Witter will pay these expenses from its own funds.
 
                                       9
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
TO THE BOARD OF DIRECTORS AND SHAREHOLDER OF
NORTHBROOK LIFE INSURANCE COMPANY:
 
We  have audited the accompanying Statements of Financial Position of Northbrook
Life Insurance  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  Northbrook Life  Insurance 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 investment in fixed income securities.
 
/s/ DELOITTE & TOUCHE LLP
 
Chicago, Illinois
March 1, 1996
 
                                      F-1
<PAGE>
                       NORTHBROOK LIFE INSURANCE 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 $59,142 and $61,581)...............  $     63,229  $     59,191
    Short-term.............................................................................         8,049         3,374
                                                                                             ------------  ------------
        Total investments..................................................................        71,278        62,565
  Reinsurance recoverable from Allstate Life Insurance Company.............................     2,636,981     3,085,781
  Cash.....................................................................................            87            59
  Deferred income taxes....................................................................                          77
  Net receivable from Allstate Life Insurance Company......................................         6,183         8,895
  Other assets.............................................................................         2,164         2,233
  Separate Accounts........................................................................     3,354,910     2,604,623
                                                                                             ------------  ------------
        Total assets.......................................................................  $  6,071,603  $  5,764,233
                                                                                             ------------  ------------
                                                                                             ------------  ------------
Liabilities
  Reserve for life insurance policy benefits...............................................  $    139,509  $    134,942
  Contractholder funds.....................................................................     2,497,278     2,950,532
  Income taxes payable.....................................................................           233         4,634
  Deferred income taxes....................................................................         2,798
  Separate Accounts........................................................................     3,354,910     2,604,623
                                                                                             ------------  ------------
        Total liabilities..................................................................     5,994,728     5,694,731
                                                                                             ------------  ------------
Shareholder's equity
  Common stock ($100 par value, 25,000 shares authorized, issued and outstanding)..........         2,500         2,500
  Additional capital paid-in...............................................................        56,600        56,600
  Unrealized net capital gains (losses)....................................................         2,657        (1,553)
  Retained income..........................................................................        15,118        11,955
                                                                                             ------------  ------------
        Total shareholder's equity.........................................................        76,875        69,502
                                                                                             ------------  ------------
        Total liabilities and shareholder's equity.........................................  $  6,071,603  $  5,764,233
                                                                                             ------------  ------------
                                                                                             ------------  ------------
</TABLE>
 
                       See notes to financial statements.
 
                                      F-2
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                            STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                                                YEAR ENDED DECEMBER 31,
                                                                                            -------------------------------
                                                                                              1995       1994       1993
                                                                                            ---------  ---------  ---------
                                                                                                   ($ IN THOUSANDS)
<S>                                                                                         <C>        <C>        <C>
Revenues
  Net investment income...................................................................  $   4,782  $   2,881  $   2,934
  Realized capital gains and losses.......................................................         67       (193)       323
                                                                                            ---------  ---------  ---------
Income before income taxes................................................................      4,849      2,688      3,257
Income tax expense........................................................................      1,686        955        750
                                                                                            ---------  ---------  ---------
Net income................................................................................  $   3,163  $   1,733  $   2,507
                                                                                            ---------  ---------  ---------
                                                                                            ---------  ---------  ---------
</TABLE>
 
                       See notes to financial statements.
 
                                      F-3
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                       STATEMENTS OF SHAREHOLDER'S EQUITY
 
<TABLE>
<CAPTION>
                                                                                        UNREALIZED
                                                                           ADDITIONAL   NET CAPITAL
                                                                COMMON       CAPITAL       GAINS     RETAINED
                                                                 STOCK       PAID-IN     (LOSSES)     INCOME      TOTAL
                                                              -----------  -----------  -----------  ---------  ---------
                                                                                   ($ IN THOUSANDS)
<S>                                                           <C>          <C>          <C>          <C>        <C>
Balance, December 31, 1992..................................   $   2,500    $  31,600                $   7,715  $  41,815
  Net income................................................                                             2,507      2,507
  Change in unrealized net capital gains and losses.........                             $     747                    747
                                                              -----------  -----------  -----------  ---------  ---------
Balance, December 31, 1993..................................       2,500       31,600          747      10,222     45,069
  Net income................................................                                             1,733      1,733
  Change in unrealized net capital gains and losses.........                                (2,300)                (2,300)
  Capital contribution......................................                   25,000                              25,000
                                                              -----------  -----------  -----------  ---------  ---------
Balance, December 31, 1994..................................       2,500       56,600       (1,553)     11,955     69,502
  Net income................................................                                             3,163      3,163
  Change in unrealized net capital gains and losses.........                                 4,210                  4,210
                                                              -----------  -----------  -----------  ---------  ---------
Balance, December 31, 1995..................................   $   2,500    $  56,600    $   2,657   $  15,118  $  76,875
                                                              -----------  -----------  -----------  ---------  ---------
                                                              -----------  -----------  -----------  ---------  ---------
</TABLE>
 
                       See notes to financial statements.
 
                                      F-4
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                            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.......................................................................  $    3,163  $    1,733  $    2,507
  Adjustments to reconcile net income to net cash from operating activities
    Realized capital (gains) losses................................................         (67)        193        (323)
    Amortization and other non-cash items..........................................         903         640         415
    Net change in reserve for policy benefits and contractholder funds.............         113         (58)     18,338
    Change in deferred income taxes................................................         608        (114)      1,227
    Changes in other operating assets and liabilities..............................      (2,705)     (3,835)    (19,325)
                                                                                     ----------  ----------  ----------
      Net cash from operating activities...........................................       2,015      (1,441)      2,839
                                                                                     ----------  ----------  ----------
Cash flows from investing activities
  Fixed income securities
    Proceeds from sales............................................................       5,423       1,256      14,279
    Investment collections.........................................................       7,108       7,626      10,375
    Investment purchases...........................................................      (9,843)    (36,071)    (29,778)
  Change in short-term investments, net............................................      (4,675)      3,475       2,369
                                                                                     ----------  ----------  ----------
      Net cash from investing activities...........................................      (1,987)    (23,714)     (2,755)
                                                                                     ----------  ----------  ----------
Cash flows from financing activities
  Capital contribution.............................................................                  25,000
                                                                                     ----------  ----------  ----------
      Net cash from financing activities...........................................                  25,000
                                                                                     ----------  ----------  ----------
Net increase (decrease) in cash....................................................          28        (155)         84
Cash at beginning of year..........................................................          59         214         130
                                                                                     ----------  ----------  ----------
Cash at end of year................................................................  $       87  $       59  $      214
                                                                                     ----------  ----------  ----------
                                                                                     ----------  ----------  ----------
</TABLE>
 
                       See notes to financial statements.
 
                                      F-5
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                         NOTES TO FINANCIAL STATEMENTS
                                ($ IN THOUSANDS)
 
1.  ORGANIZATION AND NATURE OF OPERATIONS
    Northbrook  Life  Insurance  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 single  and flexible premium annuities and
flexible premium deferred and variable  annuity contracts to individuals in  the
United  States  through  Dean  Witter Reynolds  ("Dean  Witter")(Note  4). Other
products include universal life and single premium life insurance.
 
    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   federal
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 writes long-duration insurance contracts with terms that are not
fixed  and guaranteed  and single  premium life  insurance contracts,  which are
considered universal life-type contracts.  The Company also sells  long-duration
contracts  that do  not involve  significant risk  of policyholder  mortality or
morbidity  (principally  single  and  flexible  premium  annuities,   structured
settlement   annuities  and  supplemental  contracts   when  sold  without  life
contingencies)  which  are  considered  investment  contracts.  Limited  payment
contracts  (policies with premiums paid over  a period shorter than the contract
period), primarily consist of  structured settlement annuities and  supplemental
contracts when sold with life contingencies.
 
                                      F-6
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                ($ IN THOUSANDS)
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    TRADITIONAL LIFE
 
    The  reserve for life insurance policy benefits, which relates to structured
settlement  annuities   and  supplementary   contracts  when   sold  with   life
contingencies,  is computed on the basis  of assumptions as to future investment
yields, mortality,  morbidity,  terminations and  expenses.  These  assumptions,
which  for  traditional life  are applied  using the  net level  premium method,
include  provisions  for   adverse  deviation   and  generally   vary  by   such
characteristics  as plan,  year of issue  and policy  duration. Reserve interest
rates ranged from 7.3% to 9.5% during 1995.
 
    UNIVERSAL LIFE-TYPE CONTRACTS
 
    Reserves  for  universal  life-type  contracts  are  established  using  the
retrospective  deposit method. Under  this method, liabilities  are equal to the
account balance that accrues to the benefit of the policyholder.
 
    CONTRACTHOLDER FUNDS
 
    Contractholder funds arise  from the issuance  of individual contracts  that
include  an  investment  component,  including  universal  life-type  contracts.
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.
During 1995, credited interest rates on contractholder funds ranged from 3.0% to
8.0%  for those contracts  with fixed interest  rates and from  3.0% to 8.7% for
those with flexible rates.
 
    SEPARATE ACCOUNTS
 
    The Company issues 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. Assets  and liabilities  of the  Separate Accounts  represent
funds  of Northbrook  Variable Annuity  Account and  Northbrook Variable Annuity
Account II ("Separate  Accounts"), unit  investment trusts  registered with  the
Securities  and Exchange  Commission. The  assets of  the Separate  Accounts are
carried at fair value.  Investment income and realized  gains and losses of  the
Separate Accounts 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.
 
    REINSURANCE
 
    Premiums, contract charges, credited interest, and policy benefits are ceded
and reflected net of such cessions in the statements of operations.  Reinsurance
recoverable  and  the related  reserves for  policy benefits  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
 
                                      F-7
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                ($ IN THOUSANDS)
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
component  of shareholder's equity. Provisions are  made to write down the 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.
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 $747, with no impact  on
net income.
 
4.  RELATED PARTY TRANSACTIONS
 
    REINSURANCE
 
    The  Company  reinsures  substantially  all  business  with  Allstate  Life.
Premiums and contract charges ceded to Allstate Life were $2,284 and $52,348  in
1995,  $1,886 and  $38,306 in  1994, and  $2,688 and  $22,446 in  1993. Credited
interest, policy benefits and other expenses ceded to Allstate Life amounted  to
$229,525,  $243,326,  and  $525,467  in  1995,  1994,  and  1993,  respectively.
Investment income earned on  the assets which  support contractholder funds  was
excluded   from  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.
 
                                      F-8
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                ($ IN THOUSANDS)
 
4.  RELATED PARTY TRANSACTIONS (CONTINUED)
    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. 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 $5,341,
$5,483  and  $5,301 in  1995,  1994 and  1993,  respectively. Investment-related
expenses are retained by  the Company. All other  costs are assumed by  Allstate
Life under reinsurance agreements.
 
    DEAN WITTER
 
    The  Company and  Allstate Life have  formed a strategic  alliance with Dean
Witter to develop, market and distribute proprietary annuity and life  insurance
products  through Dean Witter account executives. Dean Witter provides a portion
of the funding for these products through loans to an affiliate of the Company.
 
    Under the terms  of the strategic  alliance, which is  cancelable by  either
party,  the Company has agreed  to use Dean Witter  as an exclusive distribution
channel for the Company's products. Dean  Witter is also the investment  manager
for  the Dean Witter Variable Investment Series, the fund in which the assets of
the Separate Accounts are invested.
 
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,
foreign  tax  credits,  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
 
                                      F-9
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                ($ IN THOUSANDS)
 
5.  INCOME TAXES (CONTINUED)
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>
Deferred assets
  Unrealized net capital losses on fixed income securities....................  $          $     837
                                                                                ---------  ---------
    Total deferred assets.....................................................                   837
                                                                                ---------  ---------
Deferred liabilities
  Difference in tax bases of investments......................................     (1,368)      (760)
  Unrealized net capital gains on fixed income securities.....................     (1,430)
                                                                                ---------  ---------
    Total deferred liabilities................................................     (2,798)      (760)
                                                                                ---------  ---------
Net deferred (liability) asset................................................  $  (2,798) $      77
                                                                                ---------  ---------
                                                                                ---------  ---------
</TABLE>
 
    The components of income tax expense are as follows:
 
<TABLE>
<CAPTION>
                                                                              YEAR ENDED DECEMBER 31,
                                                                          -------------------------------
                                                                            1995       1994       1993
                                                                          ---------  ---------  ---------
<S>                                                                       <C>        <C>        <C>
Current.................................................................  $   1,078  $   1,069  $     641
Deferred................................................................        608       (114)       109
                                                                          ---------  ---------  ---------
Income tax expense......................................................  $   1,686  $     955  $     750
                                                                          ---------  ---------  ---------
                                                                          ---------  ---------  ---------
</TABLE>
 
    The Company paid income taxes of $4,206, $4,219 and $1,175 in 1995, 1994 and
1993,  respectively under the  Tax Sharing Agreement.  Included in these amounts
are $2,651, $2,826 and $1,111 reimbursed  to the Company by Allstate Life  under
the terms of reinsurance agreements for 1995, 1994 and 1993, respectively.
 
    The  Company had income taxes payable to Allstate Life of $233 and $4,634 at
December 31, 1995 and 1994, respectively.
 
                                      F-10
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                ($ IN THOUSANDS)
 
5.  INCOME TAXES (CONTINUED)
    A reconciliation of the statutory federal  income tax rate to the  effective
federal income tax rate is as follows:
 
<TABLE>
<CAPTION>
                                                                               YEAR ENDED DECEMBER 31,
                                                                        -------------------------------------
                                                                           1995         1994         1993
                                                                        -----------  -----------  -----------
<S>                                                                     <C>          <C>          <C>
Statutory federal income tax rate.....................................       35.0%        35.0%        35.0%
Dividends received deduction..........................................                                (10.6)
Tax-exempt income.....................................................                                 (1.7)
Other.................................................................       (0.3)         0.5          0.3
                                                                              ---        -----        -----
Effective federal income tax rate.....................................       34.7%        35.5%        23.0%
                                                                              ---        -----        -----
                                                                              ---        -----        -----
</TABLE>
 
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   --------------------    FAIR
                                                                       COST        GAINS     LOSSES      VALUE
                                                                    -----------  ---------  ---------  ---------
<S>                                                      <C>        <C>          <C>        <C>        <C>
AT DECEMBER 31, 1995
U.S. government and agencies...........................              $   8,619   $     880  $          $   9,499
Municipal..............................................                  1,583          83                 1,666
Corporate..............................................                  4,967         349                 5,316
Mortgage-backed securities.............................                 43,973       3,003        228     46,748
                                                                    -----------  ---------  ---------  ---------
    Totals.............................................              $  59,142   $   4,315  $     228  $  63,229
                                                                    -----------  ---------  ---------  ---------
                                                                    -----------  ---------  ---------  ---------
 
<CAPTION>
 
                                                                                   GROSS UNREALIZED
                                                                     AMORTIZED   --------------------    FAIR
                                                                       COST        GAINS     LOSSES      VALUE
                                                                    -----------  ---------  ---------  ---------
<S>                                                      <C>        <C>          <C>        <C>        <C>
AT DECEMBER 31, 1994
U.S. government and agencies...........................              $   9,619   $      49  $     825  $   8,843
Municipal..............................................                  1,642          77          3      1,716
Corporate..............................................                  3,172                     63      3,109
Mortgage-backed securities.............................                 47,148          75      1,700     45,523
                                                                    -----------  ---------  ---------  ---------
    Totals.............................................              $  61,581   $     201  $   2,591  $  59,191
                                                                    -----------  ---------  ---------  ---------
                                                                    -----------  ---------  ---------  ---------
</TABLE>
 
                                      F-11
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                ($ IN THOUSANDS)
 
6.  INVESTMENTS (CONTINUED)
    SCHEDULED MATURITIES
 
    The scheduled maturities for  fixed income securities  at December 31,  1995
are as follows:
 
<TABLE>
<CAPTION>
                                                                                  AMORTIZED COST   FAIR VALUE
                                                                                  ---------------  -----------
<S>                                                                               <C>              <C>
Due in one year or less.........................................................     $     270      $     272
Due after one year through five years...........................................         3,021          3,182
Due after five years through ten years..........................................         4,647          5,124
Due after ten years.............................................................         7,231          7,903
                                                                                       -------     -----------
                                                                                        15,169         16,481
Mortgage-backed securities......................................................        43,973         46,748
                                                                                       -------     -----------
    Total.......................................................................     $  59,142      $  63,229
                                                                                       -------     -----------
                                                                                       -------     -----------
</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 included
in shareholder's equity at December 31, 1995 are as follows:
 
<TABLE>
<CAPTION>
                                                                                               UNREALIZED NET
                                                                 AMORTIZED COST   FAIR VALUE   GAINS/(LOSSES)
                                                                 ---------------  -----------  ---------------
<S>                                                              <C>              <C>          <C>
Fixed income securities........................................     $  59,142      $  63,229      $   4,087
                                                                      -------     -----------
                                                                      -------     -----------
Deferred income taxes..........................................                                      (1,430)
                                                                                                    -------
    Total......................................................                                   $   2,657
                                                                                                    -------
                                                                                                    -------
</TABLE>
 
    The change  in unrealized  net capital  gains and  losses for  fixed  income
securities is as follows:
 
<TABLE>
<CAPTION>
                                                                                          YEAR ENDED DECEMBER
                                                                                                  31,
                                                                                          --------------------
                                                                                            1995       1994
                                                                                          ---------  ---------
<S>                                                                                       <C>        <C>
Fixed income securities.................................................................  $   6,477  $  (3,539)
Deferred income taxes...................................................................     (2,267)     1,239
                                                                                          ---------  ---------
    Change in unrealized net capital gains and losses...................................  $   4,210  $  (2,300)
                                                                                          ---------  ---------
                                                                                          ---------  ---------
</TABLE>
 
                                      F-12
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                ($ IN THOUSANDS)
 
6.  INVESTMENTS (CONTINUED)
    COMPONENTS OF INVESTMENT INCOME
 
    Investment income by type of investment is as follows:
 
<TABLE>
<CAPTION>
                                                                                      YEAR ENDED DECEMBER 31,
                                                                                  -------------------------------
                                                                                    1995       1994       1993
                                                                                  ---------  ---------  ---------
<S>                                                                               <C>        <C>        <C>
Investment income:
  Fixed income securities.......................................................  $   4,633  $   2,735  $   2,793
  Short-term....................................................................        215        192        172
                                                                                  ---------  ---------  ---------
Investment income, before expense...............................................      4,848      2,927      2,965
Investment expense..............................................................         66         46         31
                                                                                  ---------  ---------  ---------
    Net investment income.......................................................  $   4,782  $   2,881  $   2,934
                                                                                  ---------  ---------  ---------
                                                                                  ---------  ---------  ---------
</TABLE>
 
    REALIZED CAPITAL GAINS AND LOSSES
 
    Realized capital gains and losses on investments are as follows:
 
<TABLE>
<CAPTION>
                                                                                          YEAR ENDED DECEMBER 31,
                                                                                      -------------------------------
                                                                                        1995       1994       1993
                                                                                      ---------  ---------  ---------
<S>                                                                                   <C>        <C>        <C>
Fixed income securities.............................................................  $      67  $    (193) $     323
Income tax (expense) benefit........................................................        (23)        68       (113)
                                                                                            ---  ---------  ---------
Net realized gains (losses).........................................................  $      44  $    (125) $     210
                                                                                            ---  ---------  ---------
                                                                                            ---  ---------  ---------
</TABLE>
 
    PROCEEDS FROM SALES OF FIXED INCOME SECURITIES
 
    The proceeds from sales of investments in fixed income securities, excluding
calls, and related gross realized gains and losses are as follows:
 
<TABLE>
<CAPTION>
                                                                                    YEAR ENDED DECEMBER 31,
                                                                                -------------------------------
                                                                                  1995       1994       1993
                                                                                ---------  ---------  ---------
<S>                                                                             <C>        <C>        <C>
Proceeds......................................................................  $   5,423  $   1,256  $  14,279
                                                                                ---------  ---------  ---------
                                                                                ---------  ---------  ---------
Gross realized gains..........................................................  $      67             $     318
Gross realized losses.........................................................             $    (179)       (34)
                                                                                ---------  ---------  ---------
Net realized gains (losses)...................................................  $      67  $    (179) $     284
                                                                                ---------  ---------  ---------
                                                                                ---------  ---------  ---------
</TABLE>
 
    SECURITIES ON DEPOSIT
 
    At  December  31, 1995,  fixed income  securities with  a carrying  value of
$8,041 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 assets and liabilities of
the Separate Accounts are carried  at the fair value of  the funds in which  the
 
                                      F-13
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                ($ IN THOUSANDS)
 
7.  FINANCIAL INSTRUMENTS (CONTINUED)
assets  are invested. 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 related  to 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 and annuities without life contingencies with fixed terms
are estimated using discounted  cash flow calculations  based on interest  rates
currently  offered for contracts with similar terms and duration. Contractholder
funds on investment contracts had a carrying value of $2,294,536 at December 31,
1995 and  a fair  value of  $2,274,053. The  carrying value  and fair  value  at
December 31, 1994 were $2,738,823 and $2,685,448, 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............................  $   3,163  $   1,733  $   2,507
  Income taxes..................................................................        (88)      (114)       825
  Non-admitted assets and statutory reserves....................................       (775)       (27)       (91)
                                                                                  ---------  ---------  ---------
Balance per statutory accounting principles.....................................  $   2,300  $   1,592  $   3,241
                                                                                  ---------  ---------  ---------
                                                                                  ---------  ---------  ---------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                         SHAREHOLDER'S EQUITY
                                                                                             DECEMBER 31,
                                                                                         --------------------
                                                                                           1995       1994
                                                                                         ---------  ---------
<S>                                                                                      <C>        <C>
Balance per generally accepted accounting principles...................................  $  76,875  $  69,502
  Income taxes.........................................................................     (1,614)       (77)
  Unrealized net capital gains (losses)................................................     (4,087)     2,390
  Non-admitted assets and statutory reserves...........................................      1,891     (1,086)
                                                                                         ---------  ---------
Balance per statutory accounting principles............................................  $  73,065  $  70,729
                                                                                         ---------  ---------
                                                                                         ---------  ---------
</TABLE>
 
    PERMITTED STATUTORY ACCOUNTING PRACTICES
 
    The Company prepares its 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
 
                                      F-14
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                ($ IN THOUSANDS)
 
8.  STATUTORY FINANCIAL INFORMATION (CONTINUED)
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 $7,057.
 
                                      F-15
<PAGE>
                       NORTHBROOK LIFE INSURANCE COMPANY
                            SCHEDULE IV--REINSURANCE
                                ($ IN THOUSANDS)
 
                                        YEAR ENDED DECEMBER 31, 1995
 
                                                GROSS               NET
                                                AMOUNT    CEDED    AMOUNT
                                               --------  --------  ------
Life insurance in force......................  $610,478  $610,478   $
                                               --------  --------  ------
                                               --------  --------  ------
Premiums and contract charges:
  Life and annuities.........................  $ 54,632  $ 54,632   $
                                               --------  --------  ------
                                               --------  --------  ------
 
                      YEAR ENDED DECEMBER 31, 1994
 
                                                GROSS               NET
                                                AMOUNT    CEDED    AMOUNT
                                               --------  --------  ------
Life insurance in force......................  $661,356  $661,356   $
                                               --------  --------  ------
                                               --------  --------  ------
Premiums and contract charges:
  Life and annuities.........................  $ 40,192  $ 40,192   $
                                               --------  --------  ------
                                               --------  --------  ------
 
                      YEAR ENDED DECEMBER 31, 1993
 
                                                GROSS               NET
                                                AMOUNT    CEDED    AMOUNT
                                               --------  --------  ------
Life insurance in force......................  $702,975  $702,975   $
                                               --------  --------  ------
                                               --------  --------  ------
Premiums and contract charges:
  Life and annuities.........................  $ 25,134  $ 25,134   $
                                               --------  --------  ------
                                               --------  --------  ------
 
                                      F-16
<PAGE>
INDEPENDENT AUDITORS' REPORT
 
TO THE BOARD OF DIRECTORS AND SHAREHOLDER OF
NORTHBROOK LIFE INSURANCE COMPANY:
 
    We  have  audited the  accompanying Statement  of  Net Assets  of Northbrook
Variable Annuity  Account (the  "Account")  as of  December  31, 1995,  and  the
related  Statements of  Operations for  the year then  ended and  Changes in Net
Assets for each of the  two years in the period  ended December 31, 1995 of  the
Money  Market,  High Yield,  Equity, Quality  Income Plus,  Strategist, Dividend
Growth, Utilities, European Growth, Capital  Growth, Global Dividend Growth  and
Pacific  Growth portfolios 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 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. 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 audits provide 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  for the year  then ended and the  changes in its  net
assets  for each of the two years in  the period ended December 31, 1995 of each
of the portfolios comprising the Account, in conformity with generally  accepted
accounting principles.
 
/s/ DELOITTE & TOUCHE LLP
Chicago, Illinois
March 1, 1996
 
                                      F-17
<PAGE>
                      NORTHBROOK VARIABLE ANNUITY ACCOUNT
                            STATEMENT OF NET ASSETS
                               DECEMBER 31, 1995
 
($ and shares in thousands)
 
<TABLE>
<CAPTION>
ASSETS
<S>                                                                                     <C>
  Investments in the Dean Witter Variable Investment Series:
    Money Market Portfolio
      27,085 shares (cost $27,085)....................................................  $  27,085
    High Yield Portfolio
      3,914 shares (cost $30,224).....................................................     24,521
    Equity Portfolio
      2,113 shares (cost $38,722).....................................................     57,328
    Quality Income Plus Portfolio
      4,040 shares (cost $40,260).....................................................     44,270
    Strategist Portfolio
      4,417 shares (cost $48,384).....................................................     54,965
    Dividend Growth Portfolio
      5,121 shares (cost $54,531).....................................................     79,843
    Utilities Portfolio
      2,839 shares (cost $31,407).....................................................     41,684
    European Growth Portfolio
      716 shares (cost $9,798)........................................................     12,551
    Capital Growth Portfolio
      256 shares (cost $3,082)........................................................      3,895
    Global Dividend Growth Portfolio
      877 shares (cost $8,950)........................................................     10,253
    Pacific Growth Portfolio
      607 shares (cost $5,815)........................................................      5,892
                                                                                        ---------
        Total assets..................................................................    362,287
 
LIABILITIES
  Payable to Northbrook Life Insurance Company --
    accrued contract maintenance charges..............................................        133
                                                                                        ---------
        Net assets....................................................................  $ 362,154
                                                                                        ---------
                                                                                        ---------
</TABLE>
 
SEE NOTES TO FINANCIAL STATEMENTS.
 
                                      F-18
<PAGE>
                 (This page has been left blank intentionally.)
 
                                      F-19
<PAGE>
                      NORTHBROOK VARIABLE ANNUITY ACCOUNT
                            STATEMENT OF OPERATIONS
                          YEAR ENDED DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                       QUALITY
                                       MONEY      HIGH                 INCOME                 DIVIDEND
                                      MARKET      YIELD     EQUITY      PLUS     STRATEGIST    GROWTH
($ in thousands)                     PORTFOLIO  PORTFOLIO  PORTFOLIO  PORTFOLIO   PORTFOLIO   PORTFOLIO
                                     ---------  ---------  ---------  ---------  -----------  ---------
<S>                                  <C>        <C>        <C>        <C>        <C>          <C>
INVESTMENT INCOME:
  Dividends........................  $   1,887  $   3,142  $     592  $   2,939   $   5,846   $   3,661
  Less mortality and expense risk
   charges from Northbrook Life....       (340)      (271)      (529)      (451)       (642)       (759)
                                     ---------  ---------  ---------  ---------  -----------  ---------
  Net investment income (loss).....      1,547      2,871         63      2,488       5,204       2,902
                                     ---------  ---------  ---------  ---------  -----------  ---------
REALIZED AND UNREALIZED GAINS AND
 LOSSES ON INVESTMENTS:
  Realized gains and losses from
   sales of investments:
    Proceeds from sales............     29,283     10,741     18,007     14,963      26,326      15,838
    Cost of investments sold.......     29,283     13,488     14,017     14,521      23,340      11,926
                                     ---------  ---------  ---------  ---------  -----------  ---------
Net realized gains and losses......         --     (2,747)     3,990        442       2,986       3,912
                                     ---------  ---------  ---------  ---------  -----------  ---------
Change in unrealized gains and
 losses............................         --      3,290     14,353      6,444      (3,230)     16,029
                                     ---------  ---------  ---------  ---------  -----------  ---------
Net gains and losses on
 investments.......................         --        543     18,343      6,886        (244)     19,941
                                     ---------  ---------  ---------  ---------  -----------  ---------
CHANGE IN NET ASSETS RESULTING FROM
 OPERATIONS........................  $   1,547  $   3,414  $  18,406  $   9,374   $   4,960   $  22,843
                                     ---------  ---------  ---------  ---------  -----------  ---------
                                     ---------  ---------  ---------  ---------  -----------  ---------
</TABLE>
 
SEE NOTES TO FINANCIAL STATEMENTS.
 
                                      F-20
<PAGE>
 
<TABLE>
<CAPTION>
                                                                            GLOBAL
                                                 EUROPEAN      CAPITAL     DIVIDEND      PACIFIC
                                     UTILITIES    GROWTH       GROWTH       GROWTH       GROWTH
($ in thousands)                     PORTFOLIO   PORTFOLIO    PORTFOLIO    PORTFOLIO    PORTFOLIO     TOTAL
                                     ---------  -----------  -----------  -----------  -----------  ----------
<S>                                  <C>        <C>          <C>          <C>          <C>          <C>
INVESTMENT INCOME:
  Dividends........................  $   1,772   $     586    $      23    $     246    $      51   $   20,745
  Less mortality and expense risk
   charges from Northbrook Life....       (402)       (131)         (38)         (96)         (57)      (3,716)
                                     ---------  -----------  -----------  -----------  -----------  ----------
  Net investment income (loss).....      1,370         455          (15)         150           (6)      17,029
                                     ---------  -----------  -----------  -----------  -----------  ----------
REALIZED AND UNREALIZED GAINS AND
 LOSSES ON INVESTMENTS:
  Realized gains and losses from
   sales of investments:
    Proceeds from sales............     12,074       5,835        2,286        3,338        3,426      142,117
    Cost of investments sold.......     10,104       4,870        2,053        3,190        3,582      130,374
                                     ---------  -----------  -----------  -----------  -----------  ----------
Net realized gains and losses......      1,970         965          233          148         (156)      11,743
                                     ---------  -----------  -----------  -----------  -----------  ----------
Change in unrealized gains and
 losses............................      6,470       1,459          826        1,500          349       47,490
                                     ---------  -----------  -----------  -----------  -----------  ----------
Net gains and losses on
 investments.......................      8,440       2,424        1,059        1,648          193       59,233
                                     ---------  -----------  -----------  -----------  -----------  ----------
CHANGE IN NET ASSETS RESULTING FROM
 OPERATIONS........................      9,810       2,879        1,044    $   1,798    $     187       76,262
                                     ---------  -----------  -----------  -----------  -----------  ----------
                                     ---------  -----------  -----------  -----------  -----------  ----------
</TABLE>
 
                                      F-21
<PAGE>
                      NORTHBROOK VARIABLE ANNUITY ACCOUNT
                       STATEMENT OF CHANGES IN NET ASSETS
                          YEAR ENDED DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                         QUALITY
                                       MONEY       HIGH                   INCOME                 DIVIDEND
($ and units in thousands,             MARKET      YIELD      EQUITY       PLUS     STRATEGIST    GROWTH
except value per unit)               PORTFOLIO   PORTFOLIO  PORTFOLIO   PORTFOLIO   PORTFOLIO   PORTFOLIO
                                     ----------  ---------  ----------  ----------  ----------  ----------
<S>                                  <C>         <C>        <C>         <C>         <C>         <C>
FROM OPERATIONS:
  Net investment income (loss).....  $    1,547  $   2,871  $       63  $    2,488  $    5,204  $    2,902
  Net realized gains and losses....                 (2,747)      3,990         442       2,986       3,912
  Net change in unrealized gains
   and losses......................                  3,290      14,353       6,444      (3,230)     16,029
                                     ----------  ---------  ----------  ----------  ----------  ----------
                                          1,547      3,414      18,406       9,374       4,960      22,843
                                     ----------  ---------  ----------  ----------  ----------  ----------
FROM CAPITAL TRANSACTIONS:
  Deposits.........................         250        207         307         317         160         768
  Benefit payments.................        (398)      (749)       (485)       (698)       (698)       (648)
  Payments on termination..........     (12,791)    (6,897)    (13,097)    (12,503)    (20,203)    (15,665)
  Contract maintenance charges.....         (19)       (24)        (44)        (27)        (47)        (62)
  Transfers among the portfolios
   and with the Fixed Account,
   net.............................      (3,451)        (1)      1,172       1,526      (4,038)      2,374
                                     ----------  ---------  ----------  ----------  ----------  ----------
                                        (16,409)    (7,464)    (12,147)    (11,385)    (24,826)    (13,233)
                                     ----------  ---------  ----------  ----------  ----------  ----------
Increase (decrease) in net
 assets............................     (14,862)    (4,050)      6,259      (2,011)    (19,866)      9,610
Net assets, beginning of period....      41,937     28,562      51,048      46,265      74,811      70,204
                                     ----------  ---------  ----------  ----------  ----------  ----------
Net assets, end of period..........  $   27,075  $  24,512  $   57,307  $   44,254  $   54,945  $   79,814
                                     ----------  ---------  ----------  ----------  ----------  ----------
                                     ----------  ---------  ----------  ----------  ----------  ----------
NET ASSET VALUE PER UNIT, END OF
 PERIOD............................  $    18.22  $   27.06  $    43.59  $    20.50  $    20.28  $    18.13
                                     ----------  ---------  ----------  ----------  ----------  ----------
                                     ----------  ---------  ----------  ----------  ----------  ----------
UNITS OUTSTANDING, END OF PERIOD...       1,486        906       1,315       2,159       2,708       4,403
                                     ----------  ---------  ----------  ----------  ----------  ----------
                                     ----------  ---------  ----------  ----------  ----------  ----------
</TABLE>
 
SEE NOTES TO FINANCIAL STATEMENTS.
 
                                      F-22
<PAGE>
 
<TABLE>
<CAPTION>
                                                                         GLOBAL
                                                 EUROPEAN     CAPITAL   DIVIDEND    PACIFIC
($ and units in thousands,           UTILITIES    GROWTH      GROWTH     GROWTH     GROWTH
except value per unit)               PORTFOLIO   PORTFOLIO   PORTFOLIO  PORTFOLIO  PORTFOLIO    TOTAL
                                     ---------  -----------  ---------  ---------  ---------  ----------
<S>                                  <C>        <C>          <C>        <C>        <C>        <C>
FROM OPERATIONS:
  Net investment income (loss).....  $   1,370   $     455   $     (15) $     150  $      (6) $   17,029
  Net realized gains and losses....      1,970         965         233        148       (156)     11,743
  Net change in unrealized gains
   and losses......................      6,470       1,459         826      1,500        349      47,490
                                     ---------  -----------  ---------  ---------  ---------  ----------
                                         9,810       2,879       1,044      1,798        187      76,262
                                     ---------  -----------  ---------  ---------  ---------  ----------
FROM CAPITAL TRANSACTIONS:
  Deposits.........................        228         142          58        240        122       2,799
  Benefit payments.................       (418)        (51)        (23)         0          0      (4,168)
  Payments on termination..........     (8,812)     (3,042)     (1,292)    (2,452)    (1,581)    (98,335)
  Contract maintenance charges.....        (30)         (8)         (3)        (7)        (4)       (275)
  Transfers among the portfolios
   and with the Fixed Account,
   net.............................        820        (823)        403      1,207      1,206         395
                                     ---------  -----------  ---------  ---------  ---------  ----------
                                        (8,212)     (3,782)       (857)    (1,012)      (257)    (99,584)
                                     ---------  -----------  ---------  ---------  ---------  ----------
Increase (decrease) in net
 assets............................      1,598        (903)        187        786        (70)    (23,322)
Net assets, beginning of period....     40,070      13,450       3,706      9,463      5,960     385,476
                                     ---------  -----------  ---------  ---------  ---------  ----------
Net assets, end of period..........  $  41,668   $  12,547   $   3,893  $  10,249  $   5,890  $  362,154
                                     ---------  -----------  ---------  ---------  ---------  ----------
                                     ---------  -----------  ---------  ---------  ---------  ----------
NET ASSET VALUE PER UNIT, END OF
 PERIOD............................  $   18.13   $   19.30   $   15.18  $   12.01  $    9.68
                                     ---------  -----------  ---------  ---------  ---------
                                     ---------  -----------  ---------  ---------  ---------
UNITS OUTSTANDING, END OF PERIOD...      2,298         650         256        853        608
                                     ---------  -----------  ---------  ---------  ---------
                                     ---------  -----------  ---------  ---------  ---------
</TABLE>
 
                                      F-23
<PAGE>
                      NORTHBROOK VARIABLE ANNUITY ACCOUNT
                       STATEMENT OF CHANGES IN NET ASSETS
                          YEAR ENDED DECEMBER 31, 1994
 
<TABLE>
<CAPTION>
                                                                       QUALITY
                                       MONEY      HIGH                 INCOME                 DIVIDEND
($ and units in thousands, except     MARKET      YIELD     EQUITY      PLUS     STRATEGIST    GROWTH
 value per unit)                     PORTFOLIO  PORTFOLIO  PORTFOLIO  PORTFOLIO   PORTFOLIO   PORTFOLIO
                                     ---------  ---------  ---------  ---------  -----------  ---------
<S>                                  <C>        <C>        <C>        <C>        <C>          <C>
FROM OPERATIONS:
  Net investment income (loss).....  $   1,120  $   3,681  $   4,298  $   4,415   $   3,667   $   1,584
  Net realized gains and losses....                (2,385)     1,793         97       1,700       1,930
  Net change in unrealized gains
   and losses......................                (2,447)    (9,687)    (9,616)     (3,086)     (6,998)
                                     ---------  ---------  ---------  ---------  -----------  ---------
                                         1,120     (1,151)    (3,596)    (5,104)      2,281      (3,484)
                                     ---------  ---------  ---------  ---------  -----------  ---------
FROM CAPITAL TRANSACTIONS:
  Deposits.........................        408        286        439        356         862       1,037
  Benefit payments.................     (1,321)      (814)      (545)      (872)       (269)       (989)
  Payments on termination..........     (9,667)    (4,449)    (5,087)    (8,061)     (9,553)     (6,457)
  Contract maintenance charges.....        (27)       (26)       (40)       (25)        (58)        (58)
  Transfers among the portfolios
   and with the Fixed Account,
   net.............................     10,730     (3,123)       799    (12,041)      1,303      (2,260)
                                     ---------  ---------  ---------  ---------  -----------  ---------
                                           123     (8,126)    (4,434)   (20,643)     (7,715)     (8,727)
                                     ---------  ---------  ---------  ---------  -----------  ---------
Increase (decrease) in net
 assets............................      1,243     (9,277)    (8,030)   (25,747)     (5,434)    (12,211)
Net assets, beginning of period....     40,694     37,839     59,078     72,012      80,245      82,415
                                     ---------  ---------  ---------  ---------  -----------  ---------
Net assets, end of period..........  $  41,937  $  28,562  $  51,048  $  46,265   $  74,811   $  70,204
                                     ---------  ---------  ---------  ---------  -----------  ---------
                                     ---------  ---------  ---------  ---------  -----------  ---------
NET ASSET VALUE PER UNIT, END OF
 PERIOD............................  $   17.41  $   23.76  $   30.88  $   16.65  $    18.73   $   13.43
                                     ---------  ---------  ---------  ---------  -----------  ---------
                                     ---------  ---------  ---------  ---------  -----------  ---------
UNITS OUTSTANDING, END OF PERIOD...      2,409      1,203      1,653      2,779       3,994       5,229
                                     ---------  ---------  ---------  ---------  -----------  ---------
                                     ---------  ---------  ---------  ---------  -----------  ---------
</TABLE>
 
SEE NOTES TO FINANCIAL STATEMENTS.
 
                                      F-24
<PAGE>
 
<TABLE>
<CAPTION>
                                                                          GLOBAL
                                                 EUROPEAN     CAPITAL    DIVIDEND      PACIFIC
($ and units in thousands, except    UTILITIES    GROWTH      GROWTH      GROWTH       GROWTH
 value per unit)                     PORTFOLIO   PORTFOLIO   PORTFOLIO   PORTFOLIO    PORTFOLIO     TOTAL
                                     ---------  -----------  ---------  -----------  -----------  ---------
<S>                                  <C>        <C>          <C>        <C>          <C>          <C>
FROM OPERATIONS:
  Net investment income (loss).....  $   1,836   $     486   $       9   $      64    $     (15)  $  21,145
  Net realized gains and losses....      2,606         698          16         (28)                   6,427
  Net change in unrealized gains
   and losses......................    (10,091)       (336)       (127)       (197)        (272)    (42,857)
                                     ---------  -----------  ---------  -----------  -----------  ---------
                                        (5,649)        848        (102)       (161)        (287)    (15,285)
                                     ---------  -----------  ---------  -----------  -----------  ---------
FROM CAPITAL TRANSACTIONS:
  Deposits.........................        464         375          67         703          616       5,613
  Benefit payments.................       (608)        (33)                    (11)         (15)     (5,477)
  Payments on termination..........     (4,577)     (1,740)       (514)     (1,003)        (444)    (51,552)
  Contract maintenance charges.....        (26)         (9)         (2)         (7)          (5)       (283)
  Transfers among the portfolios
   and with the Fixed Account,
   net.............................    (11,690)      2,929      (1,137)      9,942        6,095       1,547
                                     ---------  -----------  ---------  -----------  -----------  ---------
                                       (16,437)      1,522      (1,586)      9,624        6,247     (50,152)
                                     ---------  -----------  ---------  -----------  -----------  ---------
Increase (decrease) in net
 assets............................    (22,086)      2,370      (1,688)      9,463        5,960     (65,437)
Net assets, beginning of period....     62,156      11,080       5,394                              450,913
                                     ---------  -----------  ---------  -----------  -----------  ---------
Net assets, end of period..........  $  40,070   $  13,450   $   3,706   $   9,463    $   5,960   $ 385,476
                                     ---------  -----------  ---------  -----------  -----------  ---------
                                     ---------  -----------  ---------  -----------  -----------  ---------
NET ASSET VALUE PER UNIT, END OF
 PERIOD............................  $   14.24   $   15.48   $   11.53   $    9.94    $    9.25
                                     ---------  -----------  ---------  -----------  -----------
                                     ---------  -----------  ---------  -----------  -----------
UNITS OUTSTANDING, END OF PERIOD...      2,814         868         321         952          645
                                     ---------  -----------  ---------  -----------  -----------
                                     ---------  -----------  ---------  -----------  -----------
</TABLE>
 
                                      F-25
<PAGE>
                      NORTHBROOK VARIABLE ANNUITY ACCOUNT
                         NOTES TO FINANCIAL STATEMENTS
                       TWO YEARS ENDED DECEMBER 31, 1995
 
1.  ORGANIZATION
    Northbrook Variable Annuity Account (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 Northbrook Life Insurance  Company
("Northbrook  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').
 
    Northbrook 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 but may also invest  in
the  general account of Northbrook Life ("Fixed Account"). The Account, in turn,
invests solely  in  shares  of  the  portfolios  of  the  Dean  Witter  Variable
Investment   Series  ("Fund").  Northbrook   Life  provides  administrative  and
insurance services to the Account for a fee.
 
    Dean Witter  Reynolds,  Inc. ("Dean  Witter")  is the  sole  distributor  of
Northbrook  Life's  flexible  premium deferred  variable  annuity  contracts and
certain single and flexible premium annuities and is the investment manager  for
the  Fund.  In October,  1993,  Allstate Life  and  Northbrook Life  announced a
strategic alliance to  develop, market  and distribute  proprietary annuity  and
life  insurance  products through  Dean Witter  account executives.  Dean Witter
receives investment management fees from the Fund.
 
    Effective September 1, 1995, the name of the Managed Assets Portfolio of the
Fund changed  to  the Strategist  Portfolio.  While certain  of  the  investment
policies  of the  portfolio have  changed, the  overall investment  strategy has
remained the same.
 
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.
 
    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") basis.
 
    FEDERAL INCOME TAXES
 
    Net  investment income and  realized gains and losses  on investments of the
Account  are   reported   to  contractholders   generally   upon   distribution.
Accordingly, no provision for income taxes has been recorded.
 
                                      F-26
<PAGE>
                      NORTHBROOK VARIABLE ANNUITY ACCOUNT
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                       TWO YEARS ENDED DECEMBER 31, 1995
 
3.  MORTALITY AND EXPENSE CHARGES AND CONTRACT MAINTENANCE CHARGES
    Northbrook   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 1.0%  of the daily  net assets of  the Account. Northbrook Life
guarantees that the amount of this charge will not increase over the life of the
contract.
 
    For each year or portion of a year a contract is in effect, Northbrook  Life
deducts  a fixed annual contract maintenance  charge of $30 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.
 
                                      F-27
<PAGE>
                      NORTHBROOK VARIABLE ANNUITY ACCOUNT
                         NOTES TO FINANCIAL STATEMENTS
                       TWO YEARS ENDED DECEMBER 31, 1995
 
4.__UNITS ISSUED AND REDEEMED
 
    Units issued and redeemed by the Account during 1995 were as follows:
 
<TABLE>
<CAPTION>
                                        MONEY                                 QUALITY
                                       MARKET     HIGH YIELD     EQUITY     INCOME PLUS  STRATEGIST
(units in thousands)                  PORTFOLIO    PORTFOLIO    PORTFOLIO    PORTFOLIO    PORTFOLIO
                                     -----------  -----------  -----------  -----------  -----------
<S>                                  <C>          <C>          <C>          <C>          <C>
UNITS OUTSTANDING, DECEMBER 31,
 1994..............................       2,409        1,203        1,653        2,779        3,994
Unit activity during 1995:
  Issued...........................         866          182          212          261          144
  Redeemed.........................      (1,789)        (479)        (550)        (881)      (1,430)
                                     -----------       -----        -----        -----   -----------
UNITS OUTSTANDING, DECEMBER 31,
 1995..............................       1,486          906        1,315        2,159        2,708
                                     -----------       -----        -----        -----   -----------
                                     -----------       -----        -----        -----   -----------
</TABLE>
 
UNITS REDEEMED INCLUDES UNITS DEDUCTED FOR ACCRUED CONTRACT MAINTENANCE CHARGES.
 
                                      F-28
<PAGE>
4.__UNITS ISSUED AND REDEEMED (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                                             GLOBAL
                                      DIVIDEND                   EUROPEAN       CAPITAL     DIVIDEND      PACIFIC
                                       GROWTH      UTILITIES      GROWTH        GROWTH       GROWTH       GROWTH
(units in thousands)                  PORTFOLIO    PORTFOLIO     PORTFOLIO     PORTFOLIO    PORTFOLIO    PORTFOLIO
                                     -----------  -----------  -------------  -----------  -----------  -----------
<S>                                  <C>          <C>          <C>            <C>          <C>          <C>
UNITS OUTSTANDING, DECEMBER 31,
 1994..............................       5,229        2,814           868           321          952          645
Unit activity during 1995:
  Issued...........................         351          323           157           119          251          373
  Redeemed.........................      (1,177)        (839)         (375)         (184)        (350)        (410)
                                     -----------       -----           ---           ---          ---          ---
UNITS OUTSTANDING, DECEMBER 31,
 1995..............................       4,403        2,298           650           256          853          608
                                     -----------       -----           ---           ---          ---          ---
                                     -----------       -----           ---           ---          ---          ---
</TABLE>
 
                                      F-29


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