NORTHBROOK VARIABLE ANNUITY ACCOUNT
485BPOS, 1996-12-31
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<PAGE>

   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 31, 1996
                                                               FILE NO.: 2-82511
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
    
                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM N-4
 
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
   
                        POST-EFFECTIVE AMENDMENT NO. 21                      /X/
    
                                     AND/OR
 
        REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
   
                                AMENDMENT NO. 18                             /X/
                            ------------------------
    
                      NORTHBROOK VARIABLE ANNUITY ACCOUNT
                           (EXACT NAME OF REGISTRANT)
 
                       NORTHBROOK LIFE INSURANCE COMPANY
                              (NAME OF DEPOSITOR)
 
                               MICHAEL J. VELOTTA
                 VICE PRESIDENT, SECRETARY AND GENERAL COUNSEL
                       NORTHBROOK LIFE INSURANCE COMPANY
                               3100 SANDERS ROAD
                           NORTHBROOK, ILLINOIS 60062
                                 (847) 402-2400
                (NAME AND COMPLETE ADDRESS OF AGENT FOR SERVICE)
 
                                   COPIES TO:
 
     GREGOR B. MCCURDY, ESQUIRE            CHRISTINE A. EDWARDS, ESQUIRE
      ROUTIER AND JOHNSON, P.C.              DEAN WITTER REYNOLDS INC.
   1700 K STREET, N.W., SUITE 1003            TWO WORLD TRADE CENTER
       WASHINGTON, D.C. 20006                NEW YORK, NEW YORK 10048
 
                            ------------------------
 
                        STATEMENT PURSUANT TO RULE 24F-2
 
Pursuant  to Rule 24f-2 under the Investment Company Act of 1940, the Registrant
hereby states that, pursuant to paragraph (b)(1), it filed its Rule 24f-2 Notice
for the fiscal year ending December 31, 1995 on February 28, 1996.
                            ------------------------
   
 IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE (CHECK APPROPRIATE BOX)
        ___ immediately upon filing pursuant to paragraph (b) of Rule 485
        _X_ on December 31, 1996 pursuant to paragraph (b) of Rule 485
        ___ 60 days after filing pursuant to paragraph (a)(i) of Rule 485
        ___ on (date) pursuant to paragraph (a)(i) of Rule 485
    
            IF APPROPRIATE, CHECK THE FOLLOWING BOX:
        ___ This post-effective amendment designates a new effective date for a
            previously filed post-effective amendment.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

<PAGE>
                             CROSS REFERENCE SHEET
 
Showing  Location in Part A (Prospectus) and Part B of Registration Statement of
Information Required by Form N-4
 
<TABLE>
<CAPTION>
      ITEM OF
      FORM N-4                                                                                 PROSPECTUS CAPTION
- --------------------                                                             ----------------------------------------------
<S>        <C>        <C>        <C>                                             <C>
 1.        Cover Page..........................................................  Cover Page
 2.        Definitions.........................................................  Glossary
 3.        Synopsis............................................................  Introduction: Summary of Separate Account
                                                                                  Expenses
 4.        Condensed Financials................................................  --
           (a)        Chart....................................................  Condensed Financial Statements
           (b)        MM Yield.................................................  Not Applicable
           (c)        Location of Others.......................................  Financial Statements
 5.        General.............................................................  --
           (a)        Depositor................................................  Northbrook Life Insurance Company
           (b)        Registrant...............................................  The Variable Account
           (c)        Portfolio Company........................................  Dean Witter Variable Investment Series
           (d)        Fund Prospectus..........................................  Dean Witter Variable Investment Series
           (e)        Voting Rights............................................  Voting Rights
           (f)        Administrators...........................................  Charges & Other Deductions -- Contract
                                                                                  Maintenance Charge
 6.        Deductions & Expenses...............................................  Charges & Other Deductions
           (a)        General..................................................  Charges & Other Deductions
           (b)        Sales Load %.............................................  Surrender Charge
           (c)        Special Purchase Plans...................................  N/A
           (d)        Commissions..............................................  Sales Commission
           (e)        Expenses -- Registrant...................................  Variable Account Expenses
           (f)        Fund Expenses............................................  Dean Witter Variable Investment Series
                                                                                  Expenses
           (g)        Organizational Expenses..................................  N/A
 7.        Contracts
           (a)        Persons with Rights......................................  The Contracts; Benefits; Income Payments;
                                                                                  Voting Rights; Assignments; Beneficiaries
                                                                                  Contract Owners
           (b)        (i)        Allocation of Purchase Payments...............  Allocation of Purchase Payments
                      (ii)       Transfers.....................................  Transfers
                      (iii)      Exchanges.....................................  N/A
           (c)        Changes..................................................  Modification
           (d)        Inquiries................................................  Customer Inquiries
 8.        Annuity Period......................................................  Income Payments
           (a)        Material Factors.........................................  Amount of Variable Annuity Income Payments
           (b)        Dates....................................................  Income Starting Date
           (c)        Frequency, duration & level..............................  Amount of Variable Annuity Income Payments
           (d)        AIR......................................................  Amount of Variable Annuity Income Payments
           (e)        Minimum..................................................  Amount of Variable Annuity Income Payments
           (f)        -- Change Options........................................  Transfers
                      -- Transfer..............................................
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
      ITEM OF
      FORM N-4                                                                                 PROSPECTUS CAPTION
- --------------------                                                             ----------------------------------------------
<S>        <C>        <C>        <C>                                             <C>
 9.        Death Benefit.......................................................  Death Benefits
10.        Purchases & Contract Value
           (a)        Purchases................................................  Purchase of the Contract; Crediting of
                                                                                  Purchase Payments
           (b)        Valuation................................................  Value of Variable Account Accumulation Units
           (c)        Daily Calculation........................................  Value of Variable Account Accumulation Units;
                                                                                  Allocation of Purchase Payments
           (d)        Underwriter..............................................  Dean Witter Reynolds Inc.
11.        Redemptions
           (a)        -- By Owners.............................................  Surrender & Withdrawals
           (b)        -- By Annuitant..........................................  Annuity Options
           (c)        Texas ORP................................................  Not Applicable
           (d)        Lapse....................................................  Not Applicable
           (e)        Free Look................................................  Introduction
12.        Taxes...............................................................  Federal Tax Matters
13.        Legal Proceedings...................................................  N/A
14.        SAI Contents........................................................  SAI Table of Contents
15.        Cover Page..........................................................  Cover Page
16.        Table of Contents...................................................  Table of Contents
17.        General Information & History
           (a)        Depositor's Name.........................................  Northbrook Life Insurance Company
           (b)        Assets of Sub-Account....................................  The Variable Account
           (c)        Control of Depositor.....................................  Northbrook Life Insurance Company
18.        Services
           (a)        Fees & Expenses of Registrant............................  Contract Maintenance Charge
           (b)        Management Contracts.....................................  Contract Maintenance Charge; Sales Commissions
           (c)        Custodian                                                  SAI: Safekeeping of the Variable Account's
                                                                                  Assets
                      Independent Public Accountant............................  SAI: Experts
           (d)        Assets of Registrant.....................................  SAI: Safekeeping of the Variable Account
                                                                                  Assets
           (e)        Affiliated Persons.......................................  N/A
           (f)        Principal Underwriter....................................  Dean Witter Reynolds Inc.
19.        Purchase of Securities Being Offered
           (a)        Offering.................................................  SAI: Purchase of Contracts
           (b)        Sales load...............................................  SAI: Sales Commissions
20.        Underwriters
           (a)        Principal Underwriter....................................  SAI: Dean Witter Reynolds Inc.
           (b)        Continuous offering......................................  SAI: Purchase of Contracts
           (c)        Commissions..............................................  SAI: Sales Commissions; Dean Witter Reynolds
                                                                                  Inc.
           (d)        Unaffiliated Underwriters................................  N/A
21.        Calculation of Performance Data.....................................  SAI: Performance Data
22.        Annuity Payments....................................................  SAI; Income Payments
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
      ITEM OF
      FORM N-4                                                                                 PROSPECTUS CAPTION
- --------------------                                                             ----------------------------------------------
<S>        <C>        <C>        <C>                                             <C>
23.        Financial Statements
           (a)        Financial Statements of Registrant.......................  SAI; Northbrook Variable Annuity Account
                                                                                  Financial Statements
           (b)        Financial Statements of Depositor........................  SAI; Northbrook Life Insurance Company
                                                                                  Financial Statements
24a.       Financial Statements................................................  Part C.  Financial Statements
24b.       Exhibits............................................................  Part C.  Exhibits
25.        Directors and Officers..............................................  Part C.  Directors & Officers of Depositor
26.        Persons Controlled By or Under Common Control
           with Depositor or Registrant........................................  Part C.  Persons Controlled by or Under Common
                                                                                  Control with Depositor or Registrant
27.        Number of Contract Owners...........................................  Part C.  Number of Contract Owners
28.        Indemnification.....................................................  Part C.  Indemnification
29a.       Relationship of Principal Underwriter to Other
           Investment Companies................................................  Part C.  Relationship of Principal Underwriter
                                                                                  to Other Investment Companies
29b.       Principal Underwriters..............................................  Part C.  Principal Underwriters
29c.       Compensation of Underwriter.........................................  Part C.  Compensation of Dean Witter
30.        Location of Accounts and Records....................................  Part C.  Location of Accounts and Records
31.        Management Services.................................................  Part C.  Management Services
32.        Undertakings........................................................  Part C.  Undertakings
</TABLE>

<PAGE>
                      NORTHBROOK VARIABLE ANNUITY ACCOUNT
 
                                       OF
 
                       NORTHBROOK LIFE INSURANCE COMPANY
                                 P.O. BOX 94040
   
                         PALATINE, ILLINOIS 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 17.
    
 
   
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, Discover & Co.
    
 
   
The  Company has prepared and filed  a Statement of Additional Information dated
December 31, 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  23
of  this  Prospectus. Before  ordering,  you may  wish  to review  the  Table of
Contents of  the  Statement  of  Additional  Information  on  page  22  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 DECEMBER 31, 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
 
   
Glossary....................................................      3
Introduction................................................      5
Summary of Separate Account Expenses........................      7
Condensed Financial Information.............................      9
Performance Data............................................     10
Financial Statements........................................     10
Northbrook Life Insurance Company and the Variable
 Account....................................................     10
  Northbrook Life Insurance Company.........................     10
  Dean Witter Reynolds Inc..................................     10
  The Variable Account......................................     11
  The Dean Witter Variable Investment Series................     11
The Contracts...............................................     12
  Purchase of the Contracts.................................     12
  Crediting of Purchase Payments............................     12
  Allocation of Purchase Payments...........................     13
  Value of Variable Account Accumulation Units..............     13
  Transfers.................................................     13
  Surrender and Withdrawals.................................     14
  Default...................................................     14
Charges and Other Deductions................................     14
  Deductions from Purchase Payments.........................     14
  Contract Maintenance Charge...............................     14
  Mortality and Expense Risk Charge.........................     15
  Surrender Charge..........................................     15
  Taxes.....................................................     15
  Dean Witter Variable Investment Series Expenses...........     15
Benefits Under the Contract.................................     16
  Death Benefits Prior to the Income Starting Date..........     16
  Death Benefits After the Income Starting Date.............     16
Income Payments.............................................     16
  Income Starting Date......................................     16
  Amount of Variable Annuity Income Payments................     16
  Annuity Options...........................................     17
The Fixed Account...........................................     17
  General Description.......................................     17
  Transfers, Surrenders, and Withdrawals....................     18
General Matters.............................................     18
  Owner.....................................................     18
  Beneficiary...............................................     18
  Delay of Payments.........................................     19
  Assignments...............................................     19
  Modification..............................................     19
  Customer Inquiries........................................     19
Federal Tax Matters.........................................     19
  Introduction..............................................     19
  Taxation of Annuities in General..........................     19
    Tax Deferral............................................     19
    Non-Natural Owners......................................     19
    Diversification Requirements............................     19
    Investor Control........................................     20
    Taxation of Partial and Full Withdrawals................     20
    Taxation of Annuity Payments............................     20
    Taxation of Annuity Death Benefits......................     20
    Penalty Tax on Premature Distributions..................     20
    Aggregation of Annuity Contracts........................     20
  Tax Qualified Contracts...................................     20
    Restrictions Under Section 403(b) Plans.................     20
  Income Tax Withholding....................................     21
Voting Rights...............................................     21
Sales Commission............................................     21
Statement of Additional Information: Table of Contents......     22
Order Form..................................................     23
 
    
 
                                       2
<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.*
 
    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.
 
                                       3
<PAGE>
    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.
 
   
    FUND--The Dean Witter Variable Investment Series.
    
 
    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 thirteen Sub-Accounts of
the Variable Account constitute the fourteen 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  16.  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  thirteen  separate
Portfolios:  the Money Market Portfolio, the  Quality Income Plus Portfolio, the
High Yield Portfolio, the Utilities Portfolio, the Income Builder Portfolio, the
Dividend Growth Portfolio,  the Capital  Growth Portfolio,  the Global  Dividend
Growth  Portfolio, the European Growth  Portfolio, the Pacific Growth Portfolio,
the Capital  Appreciation Portfolio,  the Equity  Portfolio and  the  Strategist
Portfolio.
    
 
    PURCHASE PAYMENTS--The premiums paid by the Owner to the Company.
 
    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.
 
                                       4
<PAGE>
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. 13 and "Income Payments," pg. 16.
    
 
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 thirteen  Portfolios: the  Money Market Portfolio,  the Quality  Income
Plus  Portfolio, the High  Yield Portfolio, the  Utilities Portfolio, the Income
Builder Portfolio, the Dividend Growth Portfolio, the Capital Growth  Portfolio,
the Global Dividend Growth Portfolio, the European Growth Portfolio, the Pacific
Growth  Portfolio, the Capital Appreciation 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 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. 12 and "Crediting of Purchase Payments," pg. 12.
    
 
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. 13.
    
 
5.  CAN I TRANSFER AMOUNTS AMONG THE SUB-ACCOUNTS?
 
   
    Transfers can be made among the thirteen 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. 13.
    
 
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. 14.
    
 
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.
 
                                       5
<PAGE>
   
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. 14, and "Taxation of Annuities in General," pg. 19.
    
 
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. 14, 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 the
Contract Maintenance Charge. See "Mortality and Expense Risk Charge," pg. 15.
    
 
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. 16 and "Income Starting Date," pg. 16.
    
 
   
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. 17.
    
 
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. 16.
    
 
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. 21.
    
 
                    *                   *                   *
 
   
This prospectus  describes only  the variable  aspects of  the Contract,  except
where  fixed aspects are specifically mentioned. See  pg. 17 for a brief summary
of the Fixed Account.
    
 
                                       6
<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
                                                                                                                     CHARGE
ELAPSED TIME SINCE PURCHASE PAYMENT BEING 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>
 
<TABLE>
<S>                                                                                                   <C>
Exchange Fee........................................................................................       None
Annual Contract Fee.................................................................................  $      30
</TABLE>
 
SEPARATE ACCOUNT ANNUAL EXPENSES (AS A PERCENTAGE OF AVERAGE ACCOUNT VALUE)
 
<TABLE>
<S>                                                                                               <C>
Mortality and Expense Risk Charges:.............................................................         1%
Total Separate Account Annual Expenses:.........................................................         1%
</TABLE>
 
DEAN WITTER VARIABLE INVESTMENT SERIES ("FUND") EXPENSES
(AS A PERCENTAGE OF FUND AVERAGE NET ASSETS)
 
   
<TABLE>
<CAPTION>
                                                                                 MANAGEMENT       OTHER         TOTAL FUND
PORTFOLIO                                                                           FEES         EXPENSES     ANNUAL EXPENSES
- ------------------------------------------------------------------------------  -------------  ------------  -----------------
<S>                                                                             <C>            <C>           <C>
Money Market..................................................................         .50%           .03%            .53%
Quality Income Plus...........................................................         .50%(1)        .04%            .54%
High Yield....................................................................         .50%           .04%            .54%
Utilities.....................................................................         .65%(2)        .03%            .68%
Income Builder(5).............................................................         .75%           .07%            .82%
Dividend Growth...............................................................         .59%(3)        .02%            .61%
Capital Growth................................................................         .65%           .09%            .74%
Global Dividend Growth........................................................         .75%           .13%            .88%
European Growth...............................................................        1.00%           .17%           1.17%
Pacific Growth................................................................        1.00%           .44%           1.44%
Capital Appreciation(5).......................................................         .75%           .07%            .82%
Equity........................................................................         .50%(4)        .04%            .54%
Strategist....................................................................         .50%           .02%            .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%.
   
(5)  The  Income Builder Portfolio  and the Capital  Appreciation Portfolio  are
    anticipated  to  commence  operations  on  January  21,  1997.  Dean  Witter
    InterCapital Inc. has undertaken to assume all expenses for both the  Income
    Builder  Portfolio and the Capital Appreciation Portfolio until such time as
    the pertinent Portfolio has  $50 million of net  assets or until six  months
    from  the  date of  the  Portfolio's commencement  of  operations, whichever
    occurs first.
    
 
                                       7
<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
Income Builder Sub-Account.............................................   $      66    $      90    $     114    $     223
Dividend Growth Sub-Account............................................   $      64    $      84    $     103    $     200
Capital Growth Sub-Account.............................................   $      65    $      88    $     110    $     214
Global Dividend Growth Sub-Account.....................................   $      67    $      92    $     117    $     229
European Growth Sub-Account............................................   $      69    $     101    $     132    $     260
Pacific Growth Sub-Account.............................................   $      72    $     109    $     146    $     288
Capital Appreciation Sub-Account.......................................   $      66    $      90    $     114    $     223
Equity Sub-Account.....................................................   $      63    $      82    $      99    $     192
Strategist Sub-Account.................................................   $      63    $      81    $      98    $     190
</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
Income Builder Sub-Account.............................................   $      20    $      60    $     103    $     223
Dividend Growth Sub-Account............................................   $      17    $      54    $      92    $     200
Capital Growth Sub-Account.............................................   $      19    $      58    $      99    $     214
Global Dividend Growth Sub-Account.....................................   $      20    $      62    $     107    $     229
European Growth Sub-Account............................................   $      23    $      71    $     122    $     260
Pacific Growth Sub-Account.............................................   $      26    $      79    $     136    $     288
Capital Appreciation Sub-Account.......................................   $      20    $      60    $     103    $     223
Equity Sub-Account.....................................................   $      17    $      52    $      89    $     192
Strategist Sub-Account.................................................   $      16    $      51    $      88    $     190
</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.
 
                                       8
<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
                                                 ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                              <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
  Accumulation Unit Value, End of Period.......    $12.043    $12.669    $13.459    $14.532    $15.530    $16.260    $16.651
  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
QUALITY INCOME PLUS SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --    $10.000    $10.172    $10.828    $12.097    $12.798    $15.016
  Accumulation Unit Value, End of Period.......         --    $10.172    $10.828    $12.097    $12.798    $15.016    $16.096
  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
HIGH YIELD SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................    $14.019    $16.407    $15.745    $17.324    $14.993    $10.864    $17.064
  Accumulation Unit Value, End of Period.......    $16.407    $15.745    $17.324    $14.993    $10.864    $17.064    $20.008
  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
UTILITIES SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --         --         --         --    $10.000    $10.365    $12.372
  Accumulation Unit Value, End of Period.......         --         --         --         --    $10.365    $12.372    $13.797
  Number of Units Outstanding, End of Period...         --         --         --         --  3,364,215  3,655,014  3,883,303
INCOME BUILDER SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --         --         --         --         --         --         --
  Accumulation Unit Value, End of Period.......         --         --         --         --         --         --         --
  Number of Units Outstanding, End of Period...         --         --         --         --         --         --         --
DIVIDEND GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --         --         --         --    $10.000     $9.143    $11.564
  Accumulation Unit Value, End of Period.......         --         --         --         --     $9.143    $11.564    $12.383
  Number of Units Outstanding, End of Period...         --         --         --         --  5,838,210  5,646,884  6,048,975
CAPITAL GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --         --         --         --         --    $10.000    $12.735
  Accumulation Unit Value, End of Period.......         --         --         --         --         --    $12.735    $12.814
  Number of Units Outstanding, End of Period...         --         --         --         --         --    468,488    681,326
GLOBAL DIVIDEND GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --         --         --         --         --         --         --
  Accumulation Unit Value, End of Period.......         --         --         --         --         --         --         --
  Number of Units Outstanding, End of Period...         --         --         --         --         --         --         --
EUROPEAN GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --         --         --         --         --    $10.000    $10.050
  Accumulation Unit Value, End of Period.......         --         --         --         --         --    $10.050    $10.347
  Number of Units Outstanding, End of Period...         --         --         --         --         --    101,037    251,802
PACIFIC GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --         --         --         --         --         --         --
  Accumulation Unit Value, End of Period.......         --         --         --         --         --         --         --
  Number of Units Outstanding, End of Period...         --         --         --         --         --         --         --
CAPITAL APPRECIATION SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --         --         --         --         --         --         --
  Accumulation Unit Value, End of Period.......         --         --         --         --         --         --         --
  Number of Units Outstanding, End of Period...         --         --         --         --         --         --         --
EQUITY SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................    $13.511    $15.623    $14.510    $15.786    $18.580    $17.728    $27.916
  Accumulation Unit Value, End of Period.......    $15.623    $14.510    $15.786    $18.580    $17.728    $27.916    $27.681
  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
STRATEGIST SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --    $10.000    $10.036    $11.211    $12.284    $12.351    $15.684
  Accumulation Unit Value, End of Period.......         --    $10.036    $11.211    $12.284    $12.351    $15.684    $16.651
  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
 
<CAPTION>
 
                                                   1993       1994       1995
                                                 ---------  ---------  ---------
<S>                                              <C>        <C>        <C>
MONEY MARKET SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................    $16.651    $16.940    $17.411
  Accumulation Unit Value, End of Period.......    $16.940    $17.411    $18.215
  Number of Units Outstanding, End of Period...  2,402,295  2,408,602  1,486,360
QUALITY INCOME PLUS SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................    $16.096    $18.010    $16.648
  Accumulation Unit Value, End of Period.......    $18.010    $16.648    $20.498
  Number of Units Outstanding, End of Period...  3,998,449  2,779,045  2,159,205
HIGH YIELD SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................    $20.008    $24.609    $23.759
  Accumulation Unit Value, End of Period.......    $24.609    $23.759    $27.055
  Number of Units Outstanding, End of Period...  1,537,549  1,202,135    906,011
UTILITIES SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................    $13.797    $15.804    $14.235
  Accumulation Unit Value, End of Period.......    $15.804    $14.235    $18.132
  Number of Units Outstanding, End of Period...  3,932,991  2,814,866  2,298,190
INCOME BUILDER SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --         --         --
  Accumulation Unit Value, End of Period.......         --         --         --
  Number of Units Outstanding, End of Period...         --         --         --
DIVIDEND GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................    $12.383    $14.019    $13,425
  Accumulation Unit Value, End of Period.......    $14.019    $13.425    $18.128
  Number of Units Outstanding, End of Period...  5,878,916  5,229,279  4,402,940
CAPITAL GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................    $12.814    $11.799    $11.533
  Accumulation Unit Value, End of Period.......    $11.799    $11.533    $15.177
  Number of Units Outstanding, End of Period...    457,147    321,342    256,312
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
EUROPEAN GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................    $10.347    $14.433    $15.484
  Accumulation Unit Value, End of Period.......    $14.433    $15.484    $19.299
  Number of Units Outstanding, End of Period...    767,814    868.638    649,852
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
CAPITAL APPRECIATION SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................         --         --         --
  Accumulation Unit Value, End of Period.......         --         --         --
  Number of Units Outstanding, End of Period...         --         --         --
EQUITY SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................    $27.681    $32.807    $30.885
  Accumulation Unit Value, End of Period.......    $32.807    $30.885    $43.585
  Number of Units Outstanding, End of Period...  1,800,750  1,652,850  1,314,532
STRATEGIST SUB-ACCOUNT
  Accumulation Unit Value, Beginning of
   Period......................................    $16.651    $18.199    $18.728
  Accumulation Unit Value, End of Period.......    $18.199    $18.728    $20.284
  Number of Units Outstanding, End of Period...  4,409,391  3,994,684  2,708,051
</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  Income   Builder  and  Capital   Appreciation  Sub-Accounts  are
   anticipated to commence operations on January 21, 1997 and are anticipated to
   have Accumulation Unit Values initially set at $10.000. The Accumulation Unit
   Value for  each of  these  Sub-Accounts was  initially  set at  $10.000.  The
   Accumulation  Unit Values in this table  reflect a Mortality and Expense Risk
   Charge of 1%.
    
 
                                       9
<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. 23.)
    
 
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,  10048. Dean  Witter  is a  member of  the New  York  Stock
Exchange and the National Association of Securities Dealers, Inc.
    
 
   
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
    
 
                                       10
<PAGE>
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 thirteen 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 thirteen portfolios; the Money Market Portfolio, the Quality Income
Plus  Portfolio, the High  Yield Portfolio, the  Utilities Portfolio, the Income
Builder Portfolio*, the Dividend Growth Portfolio, the Capital Growth Portfolio,
the Global Dividend Growth Portfolio, the European Growth Portfolio the  Pacific
Growth  Portfolio, the Capital Appreciation Portfolio*, the 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.
 
   
* These Portfolios are anticipated to commence on January 21, 1997.
    
 
                                       11
<PAGE>
   
The  Income Builder Portfolio seeks, as its primary objective, reasonable income
by investing  primarily in  common stock  of large-cap  companies which  have  a
record  of  paying dividends  and the  potential  for maintaining  dividends, in
preferred stock and in  securities convertible into common  stocks of small  and
mid-cap companies and, as its secondary objective, growth of capital.
    
 
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  Capital  Appreciation  Portfolio seeks  long-term  capital  appreciation by
investing primarily in common stocks of U.S. companies that offer the  potential
for either superior earnings growth and/or appear to be undervalued.
    
 
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.
 
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.
 
                                       12
<PAGE>
ALLOCATION OF PURCHASE PAYMENTS
 
   
On the application the Owner instructs the Company how to allocate the  Purchase
Payment  among the  fourteen 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. 13).
    
 
   
For a brief summary of how Purchase Payments allocated to the Fixed Account  are
credited to the Contract, see "The Fixed Account" on pg. 17.
    
 
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
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 fourteen 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. 18.
    
 
                                       13
<PAGE>
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. 19.  For
withdrawals from the Fixed Account, see pg. 18.
    
 
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.  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.
Withdrawals  taken to satisfy IRS Required  Minimum Distribution rules will have
any applicable  withdrawal charges  waived. This  waiver is  permitted only  for
withdrawals  which satisfy  distributions resulting  from this  Contract. 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. 19.
    
 
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.
 
                                       14
<PAGE>
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 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>
 
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. 19.
    
 
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.
 
                                       15
<PAGE>
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.
 
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.
 
                                       16
<PAGE>
   
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 lesser  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 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
 
                                       17
<PAGE>
assets of the Fixed Account, subject  to applicable law. The Company  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.
 
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.
 
                                       18
<PAGE>
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. 18.
    
 
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.
 
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
 
                                       19
<PAGE>
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 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).
 
                                       20
<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.
 
                                       21
<PAGE>
                      STATEMENT OF ADDITIONAL INFORMATION
                               TABLE OF CONTENTS
 
   
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).................................       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
 
    
 
                                       22
<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
 
                                       23
<PAGE>
                      (This Page Left Intentionally Blank)
 
                                       24
<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 December 31, 1996, has  been filed with  the 
United States Securities and Exchange Commission.
    
   
                            DATED DECEMBER 31, 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
Standardized Total Returns................................................................          5
    Other Total Returns...................................................................          5
    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 ending December 
31, 1995 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
<PAGE>
                                     PART C
                               OTHER INFORMATION
 
24A. FINANCIAL STATEMENTS
 
    PART B: Northbrook Life Insurance Company Financial Schedules
            Northbrook Variable Annuity I
 
24B. EXHIBITS
 
   
    The following exhibits, correspond to those required by paragraph (b) of 
item 24 as to exhibits in Form N-4:
    
 
   
    
   
<TABLE>
<S>        <C>
 (1)       Form of Resolution of the Board of Directors of Northbrook Life Insurance Company authorizing
           establishment of the Variable Annuity Account
 (2)       Not Applicable
 (3)(a)    Underwriting Agreement*
    (b)    Form of General Agency Agreement*
 (4)       Specimen Contract**
 (5)       Form of application for a Contract**
 (6)(a)    Articles of Incorporation of Northbrook Life Insurance Company*
    (b)    By-laws of Northbrook Life Insurance Company*
 (7)       Not applicable
 (8)       Participation Agreement***
 (9)       Opinion of Robert S. Seiler, Senior Vice President, Secretary and General Counsel of
           Northbrook Life Insurance Company**
(10)(a)    Consent of Accountants
    (b)    Consent of Attorneys
(11)       Not applicable
(12)       Form of Agreement to Purchase Shares*
(13)       Performance Data Calculations***
(99)       Powers of Attorney
</TABLE>

 
- ------------------------
  *   Previously filed in Form N-4 Registration Statement No. 33-35412 dated 
      December 31, 1996 and incorporated by reference.

 **   Previously filed in Form N-4 Registration Statement No. 2-82511, dated 
      June 15, 1990 and incorporated by reference.

***   Previously filed in Form N-4 Registration Statement No. 2-82511 dated 
      May 1, 1996 and incorporated by reference.

    
<PAGE>
25.  DIRECTORS AND OFFICERS OF THE DEPOSITOR
   
<TABLE>
<CAPTION>
NAME AND PRINCIPAL BUSINESS
          ADDRESS                     POSITION AND OFFICE WITH DEPOSITOR OF THE TRUST
- ---------------------------  ------------------------------------------------------------------
<S>                          <C>
Louis G. Lower, II           Chairman of the Board of Directors and Chief Executive Officer
Michael J. Velotta           Director, Vice President, Secretary and General Counsel
Peter H. Heckman             Director, President and Chief Operating Officer
Marla G. Friedman            Vice President
John R. Hunter               Director and Assistant Vice President
Kevin R. Slawin              Director and Vice President
Casey J. Sylla               Director and Chief Investment Officer
James P. Zils                Treasurer
Keith Hauschildt             Assistant Vice President and Controller
Sarah R. Donahue             Assistant Vice President
Ronald Johnson               Assistant Vice President
Barry S. Paul                Assistant Vice President
Emma M. Kalaidjian           Assistant Secretary
Paul N. Kierig               Assistant Secretary
Mary J. McGinn               Assistant Secretary
Robert N. Roeters            Assistant Vice President
Theodore A. Schnell          Assistant Vice President, Assistant Secretary and Assistant
                              Treasurer
Brenda D. Sneed              Assistant Secretary and Assistant General Counsel
C. Nelson Strom              Assistant Vice President and Corporate Actuary
Charles F. Thalheimer        Assistant Vice President
Steven E. Shebik             Assistant Treasurer
</TABLE>
    
 
    The  principal business address  of the foregoing  officers and directors is
3100 Sanders Road, Northbrook, Illinois 60062.
 
26.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH DEPOSITOR OR REGISTRANT
 
    See 10-K Commission File #1-11840, The Allstate Corporation.
 
27.  NUMBER OF CONTRACT OWNERS
 
   
    As of November 30,  1996 there  were  in  force 632  qualified  and  6,103
non-qualified contracts. The Registrant began operations on February 14, 1983.
    
 
28.  INDEMNIFICATION
 
    The  Managing General  Agent's Agreement (Exhibit  3(b)) has  a provision in
which Northbrook Life agrees  to indemnify Dean  Witter Reynolds as  Underwriter
for  certain damages and expenses  that may be caused  by actions, statements or
omissions by  Northbrook  Life. The  Agreement  to Purchase  Shares  contains  a
similar provision in paragraph 16 of Exhibit 12.
 
    Insofar  as indemnification for liability arising  out of the Securities Act
of 1933 may be permitted to  directors, officers and controlling persons of  the
registrant  pursuant to the  foregoing provisions, or  otherwise, the registrant
has been advised that in the  opinion of the Securities and Exchange  Commission
such  indemnification is against public  policy as expressed in  the Act and is,
therefore,  unenforceable.  In  the  event  that  a  claim  for  indemnification
<PAGE>
against  such  liabilities (other  than payment  by  the registrant  of expenses
incurred by a director, officer or  controlling person of the registrant in  the
successful  defense  of  any  action,  suit,  or  proceeding)  is  asserted such
director, officer or controlling person in connection with the securities  being
registered, the registrant will, unless in the opinion of its counsel the matter
has  been settled  by controlling  precedent, submit  to a  court of appropriate
jurisdiction the question whether such  indemnification by it is against  public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.
 
29A.  RELATIONSHIP OF PRINCIPAL UNDERWRITER TO OTHER INVESTMENT COMPANIES
 
    Dean Witter Distributors Inc. is the principal underwriter for the following
investment companies:

Dean Witter Liquid Asset Fund Inc.

Dean Witter Tax-Free Daily Income Trust

Dean Witter California Tax-Free Daily Income Trust

Dean Witter Retirement Series

Dean Witter Dividend Growth Securities Inc.

Dean Witter Natural Resource Development
 Securities Inc.

Dean Witter World Wide Investment Trust

Dean Witter Capital Growth Securities

Dean Witter Convertible Securities Trust

Dean Witter Federal Securities Trust
   
Active Assets Tax-Free Trust
    
Active Assets Money Trust

Active Assets California Tax-Free Trust

Active Assets Government Securities Trust

Dean Witter Short-Term Bond Fund

Dean Witter Mid-Cap Growth Fund

Dean Witter U.S. Government Securities Trust

Dean Witter High Yield Securities Inc.

Dean Witter New York Tax-Free Income Fund

Dean Witter Tax-Exempt Securities Trust

Dean Witter California Tax-Free Income Fund

   
Dean Witter Limited Term Municipal Trust
    

Dean Witter World Wide Income Trust

Dean Witter Utilities Fund

Dean Witter Strategist Fund

Dean Witter New York Municipal Money Market
 Trust

Dean Witter Intermediate Income Securities
  Prime Income Trust

Dean Witter European Growth Fund Inc.

Dean Witter Developing Growth Securities Trust
   
Dean Witter Precious Metal and Minerals Trust
    
Dean Witter Pacific Growth Fund Inc.

Dean Witter Multi-State Municipal Series Trust

Dean Witter Federal Securities Trust

Dean Witter Short-Term U.S. Treasury Trust

Dean Witter Diversified Income Trust

Dean Witter Health Sciences Trust

Dean Witter Global Dividend Growth Securities
   
Dean Witter American Value Fund
    
Dean Witter U.S. Government Money Market
  Trust

Dean Witter Short-Term Income Fund Inc.
   
Dean Witter Premier Income Trust
    
Dean Witter Value-Added Market Series

Dean Witter Global Utilities Fund

Dean Witter High Income Securities

Dean Witter National Municipal Trust

Dean Witter International SmallCap Fund
   
Dean Witter Global Asset Allocation
    
Dean Witter Balanced Income Fund

Dean Witter Balanced Growth Fund

Dean Witter Hawaii Municipal Trust

Dean Witter Capital Appreciation Fund

Dean Witter Intermediate Term U.S. Treasury
  Trust

Dean Witter Information Fund

Dean Witter Japan Fund
   
Dean Witter Income Builder Fund

Dean Witter Special Value Fund
    
TCW/DW Core Equity Trust

TCW/DW North American Government Income
 Trust

TCW/DW Latin American Growth Fund

TCW/DW Income and Growth Fund

TCW/DW Small Cap Growth Fund

TCW/DW Balanced Fund
   
TCW/DW Mid-Cap Equity Trust
    
TCW/DW Total Return Trust
   
TCW/DW Global Telecom Trust

TCW/DW Stategic Income Trust
    
<PAGE>
29B.  PRINCIPAL UNDERWRITER
 
   
<TABLE>
<CAPTION>
NAME AND PRINCIPAL BUSINESS
ADDRESS OF EACH SUCH PERSON                             POSITIONS AND OFFICES WITH UNDERWRITER
- ----------------------------  ------------------------------------------------------------------------------------------
<S>                           <C>
Dean  Witter  Reynolds  Inc.  Underwriter
("Dean Witter")
Philip J. Purcell             Chairman, Chief Executive Officer and Director
Richard M. DeMartini          President and Chief Operating Officer, and Director, Dean Witter Capital 
James F. Higgins              President and Chief Operating Officer, and Director, Dean Witter Financial 
Stephen R. Miller             Senior Executive Vice President and Director
Raymond J. Drop               Executive Vice President
Robert J. Dwyer               Executive Vice President, National Sales Director and Director
Christine A. Edwards          Executive Vice President, Secretary, General Counsel and Director
Charles A. Fiumefreddo        Executive Vice President and Director
Frederick J. Frohne           Executive Vice President
Alfred J. Golden              Executive Vice President
E. Davisson Hardman           Executive Vice President
Mitchell M. Merin             Executive Vice President, Chief Administrative Officer and Director
Laurence E. Mollner           Executive Vice President
Jeremiah A. Mullins           Executive Vice President
Richard F. Powers             Executive Vice President and Director
John H. Schaefer              Executive Vice President
Thomas C. Schneider           Executive Vice President, Chief Financial Officer and Director
Robert B. Sculthorpe          Executive Vice President
William B. Smith              Executive Vice President and Director
Samuel H. Wolcott III         Executive Vice President
Anthony Basile                Senior Vice President
Ronald T. Carman              Senior Vice President, Associate General Counsel and Assistant Secretary
Michael T. Cunningham         Senior Vice President
Mary E. Curran                Senior Vice President
Raymond P. Douglas            Senior Vice President
Paul J. Dubow                 Senior Vice President and Deputy General Counsel
Michael T. Gregg              Senior Vice President and Deputy General Counsel
Erick R. Holt                 Senior Vice President and Assistant Secretary
Birendra Kumar                Senior Vice President and Treasurer
</TABLE>
    
<PAGE>
   
<TABLE>
<CAPTION>
NAME AND PRINCIPAL BUSINESS
ADDRESS OF EACH SUCH PERSON                             POSITIONS AND OFFICES WITH UNDERWRITER
- ----------------------------  ------------------------------------------------------------------------------------------
<S>                           <C>
George R. Ross                Senior Vice President
Robert P. Seass               Senior Vice President
Joseph G. Siniscalchi         Senior Vice President and Controller, Dean Witter Financial
Michael H. Stone              Senior Vice President
Laurence Volpe                Senior Vice President and Controller, Dean Witter Reynolds Inc.
                               and Dean Witter Capital
Lorena J. Kern                Senior Vice President
Kathryn M. McNamara           Senior Vice President and Director of Governmental Affairs
Michael D. Browne             Assistant Secretary
Marilyn Cranney               Assistant Secretary
Sheldon Curtis                Assistant Secretary
Sabrina Hurley                Assistant Secretary
Linda M. Butler               Assistant Secretary
</TABLE>
    
 
    The principal address of  Dean Witter is Two  World Trade Center, New  York,
New York 10048.
<PAGE>
29C.  COMPENSATION OF DEAN WITTER
 
    The  following  commissions and  other  compensation were  received  by each
principal underwriter, directly  or indirectly, from  the Registrant during  the
Registrant's last fiscal year:
 

<TABLE>
<CAPTION>
      (1)             (2)            (3)             (4)            (5)
                      NET        COMPENSATION
                 UNDERWRITING   OR REDEMPTION
    NAME OF      DISCOUNTS AND        OR          BROKERAGE
   PRINCIPAL      COMMISSIONS   ANNUITIZATION    COMMISSIONS    COMPENSATION
- ---------------  -------------  --------------  -------------  --------------
<S>              <C>            <C>             <C>            <C>
Dean Witter
Reynolds Inc.                                    $   276,052
</TABLE>

 
30.  LOCATION OF ACCOUNTS AND RECORDS
 
    Michael J. Velotta
    Northbrook Life Insurance Company
    3100 Sanders Road
    Northbrook, Illinois 60062
 
31.  MANAGEMENT SERVICES
 
    None
 
32.  UNDERTAKINGS
 
    The   Registrant  promises  to  file  a  post-effective  amendment  to  this
Registration Statement as frequently as is necessary to ensure that the  audited
financial statements in the Registration Statement are never more than 16 months
old  for  so  long as  payments  under  the variable  annuity  contracts  may be
accepted. Registrant  furthermore  agrees  to  include either  as  part  of  any
application  to purchase a contract  offered by the prospectus,  a space that an
applicant can check to request a  Statement of Additional Information or a  post
card  or similar written communication affixed  to or included in the Prospectus
that the applicant can remove to send for a Statement of Additional Information.
Finally,  the  Registrant  agrees  to   deliver  any  Statement  of   Additional
Information  and any  Financial Statements required  to be  made available under
this Form N-4 promptly upon written or oral request.
 
33.  REPRESENTATIONS PURSUANT TO SECTION 403(B) OF THE INTERNAL REVENUE CODE
 
    The Company  represents  that  it  is  relying  upon  a  November  28,  1988
Securities  and  Exchange Commission  no-action  letter issued  to  the American
Council of Life Insurance ("ACLI") and that the provisions of paragraphs 1-4  of
the no-action letter have been complied with.

   
34.  REPRESENTATION REGARDING CONTRACT EXPENSES

    Northbrook Life Insurance Company ("Northbrook Life") represents that the 
fees and charges deducted under the Individual Variable Annuity Contracts 
hereby registered by this Registration Statement, in aggregate, are 
reasonable in relation to the services rendered, the expenses expected to be 
incurred, and the risks assumed by Northbrook Life.
    

<PAGE>
                                   SIGNATURES
   

    Pursuant to the requirements of the Securities Act of 1933 (the "Act") 
and the Investment Company Act of 1940, the registrant, Northbrook Variable 
Annuity Account, certifies that it meets the requirements of Securities Act 
Rule 485(b) for effectiveness of this Registration Statement and has duly 
caused this Registration Statement to be signed on its behalf by the 
undersigned, thereunto duly authorized, and its seal to be hereunto affixed 
and attested, all in the Township of Northfield, State of Illinois, on the 
23rd day of December, 1996.
    
 

       NORTHBROOK VARIABLE ANNUITY ACCOUNT
                 (REGISTRANT)
                                         BY:  NORTHBROOK LIFE INSURANCE COMPANY
                                                       (DEPOSITOR)

 
(SEAL)       /s/ BRENDA D. SNEED                   /s/ MICHAEL J. VELOTTA
Attest: ------------------------------  By:  ----------------------------------
               Brenda D. Sneed                       Michael J. Velotta
           Assistant Secretary and             Vice President, Secretary and
          Assistant General Counsel                   General Counsel
   
    Pursuant  to  the  requirements  of  the  Securities  Act  of  1933  and the
Investment Company Act of 1940, this Registration Statement has been duly signed
below by  the following  Directors  and Officers  of Northbrook  Life  Insurance
Company on the 23rd day of December, 1996.
 
                                      Chairman of the Board of
         */LOUIS G. LOWER, II          Directors and Chief
- -----------------------------------    Executive Officer
           Louis G. Lower, II          (Principal Executive
                                       Officer)
 
       /s/ MICHAEL J. VELOTTA         Vice President,
- -----------------------------------    Secretary, General
           Michael J. Velotta          Counsel and Director

       **/PETER H. HECKMAN           President, Chief
- -----------------------------------    Operating Officer and
          Peter H. Heckman             Director
 
       */JOHN R. HUNTER              Assistant Vice
- -----------------------------------    President and
         John R. Hunter                Director

       **/KEVIN R. SLAWIN             Vice President
- -----------------------------------    and Director
          Kevin R. Slawin
 
        */CASEY J. SYLLA
- -----------------------------------   Chief Investment Officer
          Casey J. Sylla               and Director

      **/MARLA G. FRIEDMAN            Vice President
- -----------------------------------
         Marla G. Friedman

      **/KAREN C. GARDNER             Vice President
- -----------------------------------
         Karen C. Gardner
 
       */JAMES P. ZILS
- -----------------------------------   Treasurer
         James P. Zils
 
       **/KEITH HAUSCHILDT
- -----------------------------------   Assistant Vice President
          Keith Hauschildt             and Controller, (Principal
                                       Accounting Officer)
 
 */ By Michael J. Velotta, pursuant to Power of Attorney, previously filed.
**/ By Michael J. Velotta, pursuant to Power of Attorney, filed herewith.
    

<PAGE>

       Form of Resolution Establishing Northbrook Variable Annuity Account

                                       By

           The Board Of Directors Of Northbrook Life Insurance Company
<PAGE>


     BE IT RESOLVED, That the Company, pursuant to the provisions of Section
245.21 of the Illinois Insurance Code, hereby establishes a separate account
designated Northbrook Variable Annuity Account (hereinafter "Variable Account")
for the following use and purposes, and subject to such conditions as
hereinafter set forth.

     BE IT FURTHER RESOLVED, That Variable Account shall be established for the
purpose of providing for the issuance by the Company of such variable annuity or
such other contracts ("Contracts") as the President may designate for such
purpose and shall constitute a separate account into which are allocated amounts
paid to or held by the Company under such Contracts; and

     BE IT FURTHER RESOLVED, That the income, gains and loses, whether or not
realized, from assets allocated to Variable Account shall, in accordance with
the contracts, be credited to or charged against such account without regard to
other income, gains, or losses of the Company; and

     BE IT FURTHER RESOLVED, That the fundamental investment policy of Variable
Account  shall be to invest or reinvest the assets of Variable Account in
securities issued by investment companies registered under the Investment
company Act of 1940, as amended, as the Finance Committee may designate pursuant
to the provisions of the contracts; and

     BE IT FURTHER RESOLVED, That seven investment divisions be, and hereby are,
established within Variable Account to which net payments under the Contracts
will be allocated in accordance with instructions received from contractholders,
and that the President be, and hereby is, authorized to increase or decrease the
number of investment divisions in Variable Account as deemed necessary or
appropriate; and

     BE IT FURTHER RESOLVED, That each such investment division shall invest
only in the shares of a single mutual fund or a single mutual fund portfolio of
an investment company organized as a series fund pursuant to the Investment
Company Act of 1940; and

     BE IT FURTHER RESOLVED, That the President and Treasurer be and they hereby
are, authorized to deposit such amount in Variable Account or in each investment
division thereof as may be necessary to appropriate to facilitate the
commencement of the Account's operations; and

     BE IT FURTHER RESOLVED, That the President of the Company be, and is
hereby, authorized to change the designation of Variable Account to such other
designation as it may deem necessary or appropriate; and


                                       -2-
<PAGE>

     BE IT FURTHER RESOLVED, That the appropriate officers of the Company, with
such assistance from the Company's auditors, legal counsel and independent
consultants or others as they may require, be, and they hereby are, authorized
and directed to take all action necessary to: (a) register Variable Account as a
unit investment trust under the Investment Company Act of 1940, as amended; (b)
register the Contracts in such amounts, which may be an indefinite amount, as
the officers of the Company shall from time to time deem appropriate under the
Securities Act of 1933; and (c) take all other actions which are necessary in
connection with the offering of said contracts for sale and operation of  in
order to comply with the Investment Company Act of 1940, the Securities Exchange
Act of 1934, the Securities Act of 1933, and other applicable federal laws,
including the filing of any amendments to registration statements, any
undertakings, and any applications for exemptions from the Investment Company
Act of 1940 or other applicable federal laws as the officers of the Company
shall deem necessary or appropriate; and

     BE IT FURTHER RESOLVED, That the President and the General Counsel, and
either of them with full power to act without the other, hereby are severally
authorized and empowered to prepare, execute and cause to be filed with the
Securities and Exchange Commission on behalf of Variable Account and by the
Company as sponsor and depositor, a Form of Notification of Registration on Form
N-8A, a Registration Statement registering Variable Account as an investment
compay under the Investment Company Act of 1940, and a Registration Statement
under the Secirities Act of 1933; and

     BE IT FURTHER RESOLVED, That the appropriate officers of the Company be,
and they hereby are, authroized on behalf of Variable Account and on behalf of
the Company to take any and all action that they may deem necessary or advisable
in order to sell the Cotnracts, including any registrations, filings and
qualifications of the Company, its officers, agents and employees, and the
Contracts under the insurance and securities laws of any of the states of the
United States of America or other jurisdictions, and in connection thereiwth, to
prepare, execute, deliver and file all such applications, reports, covenants,
resolutions, applications for exemptions, consents to service of process and
other papers and instruments as may be required under such laws, and to take any
and all further action which said officers or counsel of the Company may deem
necessary or desirable (including entering into whatever agreements and
contracts may be necessary) in order to maintain such registrations or
qualifications for as long as said officers or counsel deem them to be in the
best interests of Variable Account and the Company; and

     BE IT FURTHER RESOLVED, That the General Counsel of the Company be, and
hereby is, authorized in the names and on behalf of Variable Account and the


                                       -3-
<PAGE>

Company to execute and file irrevocable written consents ont he part of Variable
Account and of the Company to be used in such states wherein such consents to
service of process may be requisite under the insurance or securities laws
therein in connection with said registration or qualification of Contracts and
to appoint the appropriate state official, or such other person as may be
allowed by said insurance or securities laws, agent of Variable Account and of
the Company for the purpose of receiving and accepting process; and

     BE IT FURTHER RESOLVED, That the President of the Company be, and hereby
is, authorized to establish criteria by which the Company shall institute
procedures to provide for a pass-through of voting rights to the owners of such
Contracts as required by the applicable laws with respect to securities owned by
Variable Account; and

     BE IT FURTHER RESOLVED, That the President of the Company is hereby
authorized to execute such agreement or agreements on such terms and subject to
such modifications as deemed necessary or appropriate (i) with a qualified
entity that will be appointed principal underwriter and distributor for the
Contracts and (ii) with one or more qualified banks or other qualified entities
to provide administrative and/or custodial services in connection with the
establishment and maintenance of Variable Account and the design, issuance, and
administration of the Contracts; and

     BE IT FURTHER RESOLVED, That since it is expected that  will invest in the
securities issued by one or more investment companies, the appropriate officers
of the Company are hereby authorized to execute whatever agreement or agreements
as may be necessary or appropriate to enable such investments to be made; and

     BE IT FURTHER RESOLVED, That the appropriate officers of the Company, and
each of them, are hereby authorized to execute and deliver all such documents
and papers and to do or cause to be done all such acts and things as they may
deem necessary or desirable to carry out the foregoing resolutions and the
intent and purposes thereof.


                                       -4-

<PAGE>

                                                                   EXHIBIT 10(a)

 

                             CONSENT OF ACCOUNTANTS

<PAGE>

                         INDEPENDENT AUDITORS' CONSENT

 

   
We  consent to the use  in this Post-Effective Amendment  No. 21 to Registration
Statement  No.  2-82511  on  Form  N-4,  of  our  report  dated  March  1,  1996
related to the financial statements of Northbrook Variable Annuity  Account  and
our  report  dated  March  1, 1996  related  to  the  financial  statements  and
financial statement schedule of Northbrook  Life Insurance Company contained  in
the  Statement of Additional Information (which  is incorporated by reference in
the Prospectus  of  Northbrook  Variable  Annuity  Account  of  Northbrook  Life
Insurance  Company) which  is part  of such  Registration Statement,  and to the
reference to us  under the  heading "Experts"  in such  Statement of  Additional
Information.
    

 

/s/ DELOITTE & TOUCHE LLP

 

Chicago, Illinois
December 27, 1996


<PAGE>

                               CONSENT OF COUNSEL



     We hereby consent to the reference to this firm under the caption "Legal
Matters" in the Statement of Additional Information forming part of Post-
Effective Amendment No. 21 to the Registration Statement on Form N-4 for
Northbrook Variable Annuity Account (File No. 2-82511).


                              Routier and Johnson, P.C.



                              By:   /s/ Gregor B. McCurdy
                                   --------------------------
                                   Gregor B. McCurdy



<PAGE>

                                POWER OF ATTORNEY

              WITH RESPECT TO THE NORTHBROOK LIFE INSURANCE COMPANY
                        VARIABLE ANNUITY ACCOUNT CONTRACT



     Know all men by these presents that Peter H. Heckman whose signature
appears below, constitutes and appoints Louis G. Lower, II, and Michael J.
Velotta, and each of them, his attorneys-in-fact, with power of substitution,
and him in any and all capacities, to sign any registration statements and
amendments thereto for the Northbrook Life Insurance Company Variable Annuity
Account Contract and to file the same, with exhibits thereto and other documents
in connection therewith, with the Securities and Exchange Commission, hereby
ratifying and confirming all that each of said attorneys-in-fact, or his
substitute or substitutes, may do or cause to be done by virtue hereof.



                                   December 6, 1996
                              -------------------------------
                              Date



                                 /s/ Peter H. Heckman
                              --------------------------------
                              Peter H. Heckman
                              President, Chief Operating Officer
                               and Director
                              Northbrook Life Insurance Company

<PAGE>

                                POWER OF ATTORNEY

              WITH RESPECT TO THE NORTHBROOK LIFE INSURANCE COMPANY
                        VARIABLE ANNUITY ACCOUNT CONTRACT



     Know all men by these presents that Kevin R. Slawin whose signature appears
below, constitutes and appoints Louis G. Lower, II, and Michael J. Velotta, and
each of them, his attorneys-in-fact, with power of substitution, and him in any
and all capacities, to sign any registration statements and amendments thereto
for the Northbrook Life Insurance Company Variable Annuity Account Contract and
to file the same, with exhibits thereto and other documents in connection
therewith, with the Securities and Exchange Commission, hereby ratifying and
confirming all that each of said attorneys-in-fact, or his substitute or
substitutes, may do or cause to be done by virtue hereof.



                                    December 6, 1996
                              -------------------------------
                              Date



                               /s/ Kevin R. Slawin
                              -------------------------------
                              Kevin R. Slawin
                              Vice President and Director
                              Northbrook Life Insurance Company

<PAGE>

                                POWER OF ATTORNEY

              WITH RESPECT TO THE NORTHBROOK LIFE INSURANCE COMPANY
                        VARIABLE ANNUITY ACCOUNT CONTRACT



     Know all men by these presents that Marla G. Friedman whose signature
appears below, constitutes and appoints Louis G. Lower, II, and Michael J.
Velotta, and each of them, her attorneys-in-fact, with power of substitution,
and her in any and all capacities, to sign any registration statements and
amendments thereto for the Northbrook Life Insurance Company Variable Annuity
Account Contract and to file the same, with exhibits thereto and other documents
in connection therewith, with the Securities and Exchange Commission, hereby
ratifying and confirming all that each of said attorneys-in-fact, or his
substitute or substitutes, may do or cause to be done by virtue hereof.



                                   December 6, 1996
                              -------------------------------
                              Date



                               /s/ Marla G. Friedman
                              -------------------------------
                              Marla G. Friedman
                              Vice President
                              Northbrook Life Insurance Company

<PAGE>

                                POWER OF ATTORNEY

              WITH RESPECT TO THE NORTHBROOK LIFE INSURANCE COMPANY
                        VARIABLE ANNUITY ACCOUNT CONTRACT



     Know all men by these presents that Karen C. Gardner whose signature
appears below, constitutes and appoints Louis G. Lower, II, and Michael J.
Velotta, and each of them, her attorneys-in-fact, with power of substitution,
and her in any and all capacities, to sign any registration statements and
amendments thereto for the Northbrook Life Insurance Company Variable Annuity
Account Contract and to file the same, with exhibits thereto and other documents
in connection therewith, with the Securities and Exchange Commission, hereby
ratifying and confirming all that each of said attorneys-in-fact, or his
substitute or substitutes, may do or cause to be done by virtue hereof.



                                  December 6, 1996
                              -------------------------------
                              Date



                               /s/ Karen C. Gardner
                              -------------------------------
                              Karen C. Gardner
                              Vice President
                              Northbrook Life Insurance Company


<PAGE>

                                POWER OF ATTORNEY

              WITH RESPECT TO THE NORTHBROOK LIFE INSURANCE COMPANY
                        VARIABLE ANNUITY ACCOUNT CONTRACT



     Know all men by these presents that Keith Hauschildt whose signature
appears below, constitutes and appoints Louis G. Lower, II, and Michael J.
Velotta, and each of them, his attorneys-in-fact, with power of substitution,
and his in any and all capacities, to sign any registration statements and
amendments thereto for the Northbrook Life Insurance Company Variable Annuity
Account Contract and to file the same, with exhibits thereto and other documents
in connection therewith, with the Securities and Exchange Commission, hereby
ratifying and confirming all that each of said attorneys-in-fact, or his
substitute or substitutes, may do or cause to be done by virtue hereof.



                                  December 17, 1996
                              -------------------------------
                              Date



                               /s/ Keith Hauschildt
                              -------------------------------
                              Keith Hauschildt
                              Assistant Vice President and Controller
                              Northbrook Life Insurance Company



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