AGA SEPARATE ACCOUNT A
497, 1998-10-29
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<PAGE>   1
 
                                ELITEPLUS BONUS
                                VARIABLE ANNUITY
 
                                   PROSPECTUS
                                OCTOBER 28, 1998
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
 
                             AGA SEPARATE ACCOUNT A
<PAGE>   2
 
                         Prospectus inside front cover
<PAGE>   3
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
              (FORMERLY, WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
Executive Office:                                        Annuity Service Office:
2929 Allen Parkway                                            205 E. 10th Avenue
Houston, TX 77019                                             Amarillo, TX 79101
                                                                  1-800-424-4990
 
            INDIVIDUAL FIXED AND VARIABLE DEFERRED ANNUITY CONTRACTS
                        WITH FLEXIBLE PURCHASE PAYMENTS
                                   ISSUED BY
 
                             AGA SEPARATE ACCOUNT A
                       (FORMERLY, WNL SEPARATE ACCOUNT A)
                                      AND
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
              (FORMERLY, WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
     The Individual Fixed and Variable Deferred Annuity Contracts with Flexible
Purchase Payments (the "Contracts") described in this Prospectus provide for
accumulation of Contract Values on a fixed or variable basis and payment of
annuity payments on a fixed and variable basis. The Contracts are designed for
use by individuals in retirement plans on a Qualified or Non-Qualified basis.
(See "Definitions.")
 
   
     Purchase Payments for the Contracts will be allocated to a segregated
investment account of American General Annuity Insurance Company (the
"Company"), which account has been designated AGA Separate Account A (the
"Separate Account"), or to the Company's General Account. Under certain
circumstances, however, Purchase Payments initially may be allocated to the
State Street Global Advisors Money Market Sub-Account of the Separate Account.
(See "Highlights.") The Separate Account invests in shares of AGA Series Trust
(formerly, WNL Series Trust); AIM Variable Insurance Funds, Inc.; Oppenheimer
Variable Account Funds; and Templeton Variable Products Series Fund. (See
"Investment Options.") AGA Series Trust is a series fund with seven Portfolios
currently available: Credit Suisse Growth and Income Portfolio, Credit Suisse
International Equity Portfolio, EliteValue Portfolio, State Street Global
Advisors Growth Equity Portfolio, State Street Global Advisors Money Market
Portfolio, Salomon Brothers U.S. Government Securities Portfolio, and Van Kampen
Emerging Growth Portfolio. Prior to May 1, 1998, the Credit Suisse Growth and
Income Portfolio was known as the BEA Growth and Income Portfolio, the
EliteValue Portfolio was known as the EliteValue Asset Allocation Portfolio, the
State Street Global Advisors Growth Equity Portfolio was known as the Global
Advisors Growth Equity Portfolio and the State Street Global Advisors Money
Market Portfolio was known as the Global Advisors Money Market Portfolio. Prior
to July 13, 1998, the Van Kampen Emerging Growth Portfolio was known as the Van
Kampen American Capital Emerging Growth Portfolio. AIM Variable Insurance Funds,
Inc. is a series fund with the following Portfolios available: AIM V.I.
Diversified Income Fund and AIM V.I. Capital Appreciation Fund. Oppenheimer
Variable Account Funds is a series fund with the following Portfolios available:
Oppenheimer High Income Fund, Oppenheimer Growth Fund, Oppenheimer Small Cap
Growth Fund and Oppenheimer Growth & Income Fund. Class 2 shares of the
following portfolios of Templeton Variable Products Series Fund are available:
Templeton Developing Markets Fund and Templeton International Fund.
    
 
     The Contracts are not deposits or obligations of, or guaranteed or endorsed
by any bank, and are not federally insured by the Federal Deposit Insurance
Corporation, the Federal Reserve Board, or any other agency. Investment in the
Contracts is subject to risk that may cause the value of the Owner's investment
to fluctuate, and when the Contracts are surrendered, the value may be higher or
lower than the Purchase Payments.
 
     This Prospectus concisely sets forth the information for a prospective
investor. Additional information about the Contracts is contained in the
Statement of Additional Information dated October 28, 1998 (the "SAI") which is
available at no charge. The SAI has been filed with the Securities and Exchange
Commission (the "SEC") and is incorporated herein by reference. The SEC
maintains a Web site (http://www.sec.gov) that contains the SAI, material
incorporated by reference, and other information regarding registrants that file
electronically with the SEC. The Table of Contents of the SAI can be found on
Page 39 of this Prospectus. For a free copy of the SAI, call 1-800-424-4990 or
write to the Company's Annuity Service Office at the address listed above.
 
INQUIRIES:
 
     Any inquiries can be made by telephone or in writing to the Annuity Service
Office listed above.
 
     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SEC, NOR HAS
THE SEC PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
     This Prospectus and the SAI are dated October 28, 1998.
 
     This Prospectus should be kept for future reference.
<PAGE>   4
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
DEFINITIONS.................................................    1
HIGHLIGHTS..................................................    3
FEE TABLES..................................................    5
CONDENSED FINANCIAL INFORMATION.............................   11
THE COMPANY.................................................   13
THE SEPARATE ACCOUNT........................................   13
INVESTMENT OPTIONS..........................................   13
  AGA Series Trust..........................................   13
  AIM Variable Insurance Funds, Inc.........................   14
  Oppenheimer Variable Account Funds........................   14
  Templeton Variable Products Series Fund...................   14
  Voting Rights.............................................   15
  Substitution of Securities................................   15
CHARGES AND DEDUCTIONS......................................   15
  Deduction for Contingent Deferred Sales Charge (Sales
     Load)..................................................   15
  Reduction or Elimination of the Contingent Deferred Sales
     Charge.................................................   16
  Deduction for Mortality and Expense Risk Charge...........   16
  Deduction for Enhanced Death Benefit Charge...............   17
  Deduction for Annual Step-Up Death Benefit Charge.........   17
  Deduction for Administrative Charge.......................   17
  Deduction for Contract Maintenance Charge.................   17
  Deduction for Premium and Other Taxes.....................   17
  Deduction for Expenses of the Investment Options..........   18
THE CONTRACTS...............................................   18
  Owner.....................................................   18
  Joint Owners..............................................   18
  Annuitant.................................................   18
  Assignment................................................   19
PURCHASE PAYMENTS AND CONTRACT VALUE........................   19
  Purchase Payments.........................................   19
  Allocation of Purchase Payments...........................   19
  Bonus.....................................................   20
  Dollar Cost Averaging.....................................   20
  Contract Value............................................   20
  Accumulation Units........................................   20
  Accumulation Unit Value...................................   21
TRANSFERS...................................................   21
  Transfers Prior to the Annuity Date.......................   21
  Transfers During the Annuity Period.......................   22
  Sweep Account Program.....................................   23
ASSET ALLOCATION PROGRAMS...................................   23
  Asset Allocation -- Portfolio Rebalancing.................   23
  Asset Allocation -- Financial Intermediaries..............   23
WITHDRAWALS.................................................   24
  Systematic Withdrawal Option..............................   25
  Texas Optional Retirement Program.........................   25
  Suspension or Deferral of Payments........................   25
PROCEEDS PAYABLE ON DEATH...................................   26
  Death of Owner During the Accumulation Period.............   26
</TABLE>
 
                                        i
<PAGE>   5
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
  Death Benefit Amount During the Accumulation Period
     (Standard Death Benefit)...............................   26
  Enhanced Death Benefit Amount During the Accumulation
     Period.................................................   26
  Annual Step-Up Death Benefit Amount During the
     Accumulation Period....................................   27
  Death Benefit Options During the Accumulation Period......   27
  Death of Owner During the Annuity Period..................   28
  Death of Annuitant........................................   28
  Payment of Death Benefit..................................   28
  Beneficiary...............................................   28
  Change of Beneficiary.....................................   28
ANNUITY PROVISIONS..........................................   29
  General...................................................   29
  Annuity Date..............................................   29
  Selection or Change of an Annuity Option..................   29
  Frequency and Amount of Annuity Payments..................   29
  Annuity...................................................   29
  Fixed Annuity.............................................   29
  Variable Annuity..........................................   30
  Annuity Options...........................................   30
DISTRIBUTOR.................................................   30
ADMINISTRATION OF THE CONTRACTS.............................   30
PERFORMANCE INFORMATION.....................................   31
  Money Market Sub-Account..................................   31
  Other Sub-Accounts........................................   31
FEDERAL TAX STATUS..........................................   32
  General...................................................   32
  Diversification...........................................   33
  Multiple Contracts........................................   34
  Contracts Owned by Other than Natural Persons.............   34
  Tax Treatment of Assignments..............................   34
  Income Tax Withholding....................................   34
  Tax Treatment of Withdrawals -- Non-Qualified Contracts...   34
  Qualified Plans...........................................   35
  Tax Treatment of Withdrawals -- Qualified Contracts.......   37
  Tax-Sheltered Annuities -- Withdrawal Limitations.........   37
  Section 457 -- Deferred Compensation Plans................   38
YEAR 2000 RISKS.............................................   38
FINANCIAL STATEMENTS........................................   38
LEGAL PROCEEDINGS...........................................   38
TABLE OF CONTENTS OF THE SAI................................   39
</TABLE>
 
                                       ii
<PAGE>   6
 
                                  DEFINITIONS
 
     ACCUMULATION PERIOD: The period during which Purchase Payments may be made
prior to the Annuity Date.
 
     ACCUMULATION UNIT: A unit of measure used to determine the value of the
Owner's interest in a Sub-Account of the Separate Account during the
Accumulation Period.
 
     ADJUSTED CONTRACT VALUE: The Contract Value less any applicable premium tax
and Contract Maintenance Charge. This amount is applied to the applicable
Annuity Tables to determine Annuity Payments.
 
     ADMINISTRATIVE CHARGE: A deduction from the Separate Account which equals,
on an annual basis, .15% of the average daily net asset value of the Separate
Account.
 
     AGE: The age of any Owner or Annuitant on his/her last birthday.
 
     ANNUITANT: The natural person on whose life Annuity Payments are based. On
or after the Annuity Date, the Annuitant shall also include any Joint Annuitant.
 
     ANNUITY DATE: The date on which Annuity Payments begin.
 
     ANNUITY OPTIONS: Options available for Annuity Payments.
 
     ANNUITY PAYMENTS: The series of payments made to the Owner or any named
payee after the Annuity Date under the Annuity Option selected.
 
     ANNUITY PERIOD: The period of time beginning with the Annuity Date during
which the Annuity Payments are made.
 
     ANNUITY SERVICE OFFICE: The office indicated on the Cover Page of this
Prospectus to which notices and requests must be sent.
 
     ANNUITY UNIT: A unit of measure used to calculate Variable Annuity payments
during the Annuity Period.
 
     BENEFICIARY: The person(s) or entity(ies) who/that will receive the death
benefit.
 
     BONUS: An additional amount paid by the Company, equal to 1% of the initial
Purchase Payment and, as of June 1, 1998, subject to state regulatory approval,
an amount equal to 1% of certain subsequent Purchase Payments. The Bonus will be
paid for subsequent Purchase Payments of at least $5,000 for Non-Qualified
Contracts or $2,000 for Qualified Contracts. The Bonus will not be paid for
subsequent Purchase Payments made prior to June 1, 1998. A Bonus is recapturable
by the Company under certain circumstances. See the discussion of the Bonus in
this Prospectus for more information.
 
     COMPANY: American General Annuity Insurance Company (formerly, Western
National Life Insurance Company).
 
     CONTRACT ANNIVERSARY: An anniversary of the Issue Date.
 
     CONTRACT VALUE: The sum of the Owner's interest in the General Account and
the Sub-Accounts of the Separate Account during the Accumulation Period.
 
     CONTRACT YEAR: The first Contract Year is the annual period which begins on
the Issue Date. Subsequent Contract Years begin on each Contract Anniversary.
 
     FIXED ANNUITY: A series of payments made during the Annuity Period that are
guaranteed as to dollar amount by the Company.
 
     GENERAL ACCOUNT: The Company's general investment account which contains
all the assets of the Company with the exception of the Separate Account and
other segregated asset accounts.
 
                                        1
<PAGE>   7
 
     INVESTMENT OPTION: An investment entity into which assets of the Separate
Account will be invested.
 
     ISSUE DATE: The date on which the Contract became effective.
 
     MORTALITY AND EXPENSE RISK CHARGE: An amount deducted by the Company from
the Separate Account each Valuation Period which is equal, on an annual basis,
to 1.25% of the average daily net asset value of the Separate Account.
 
     NON-QUALIFIED CONTRACTS: Contracts issued under non-qualified plans which
do not receive favorable tax treatment under Sections 401, 403(b), 408 or 457 of
the Internal Revenue Code of 1986, as amended (the "Code").
 
     OWNER: The person or entity entitled to the ownership rights stated in the
Contract.
 
     PORTFOLIO: A segment of an Investment Option which constitutes a separate
and distinct class of shares.
 
     PURCHASE PAYMENT: A payment made by or on behalf of an Owner with respect
to the Contract.
 
     QUALIFIED CONTRACTS: Contracts issued under Qualified Plans which receive
favorable tax treatment under Sections 401, 403(b), 408 or 457 of the Code.
 
     SEPARATE ACCOUNT: The Company's Separate Account designated as AGA Separate
Account A.
 
     SUB-ACCOUNT: Separate Account assets are divided into Sub-Accounts. Assets
of each Sub-Account will be invested in shares of an Investment Option or a
Portfolio of an Investment Option.
 
     VALUATION DATE: Each day on which the Company and the New York Stock
Exchange ("NYSE") are open for business. There may be dates when the New York
Stock Exchange is open for business and the Company is closed. The day after
Thanksgiving is the only such date. On such date, Owners will not have access to
their accounts and therefore, no transactions will be processed for the Separate
Account on such date. The Company will be closed each day that the New York
Stock Exchange is closed for business.
 
     VALUATION PERIOD: The period of time beginning at the close of business of
the NYSE on each Valuation Date and ending at the close of business for the next
succeeding Valuation Date.
 
     VARIABLE ANNUITY: An annuity with payments which vary as to dollar amount
in relation to the investment performance of specified Sub-Accounts of the
Separate Account.
 
     WRITTEN REQUEST: A request in writing, in a form satisfactory to the
Company, which is received by the Annuity Service Office, at the office listed
above.
 
                                        2
<PAGE>   8
 
                                   HIGHLIGHTS
 
     Purchase Payments for the Contracts will be allocated to a segregated
investment account of American General Annuity Insurance Company (the
"Company"), which account has been designated AGA Separate Account A (the
"Separate Account"), or to the Company's General Account. Under certain
circumstances, however, Purchase Payments may initially be allocated to the
State Street Global Advisors Money Market Sub-Account of the Separate Account
(see below). The Separate Account invests in shares of the Investment Options.
Owners bear the investment risk for all amounts allocated to the Separate
Account.
 
     The Contract may be returned to the Company for any reason within 10
calendar days after its receipt by the Owner (or, if the Contract is issued in
California, 30 calendar days after the date of receipt if the Owner is 60 years
old as of the Issue Date, or 20 calendar days of the date of receipt with
respect to the circumstances described in (c) below). (See "Right to Examine.")
It may be returned to the Company at its Annuity Service Office, or to the agent
through whom it was purchased. When the Contract is received by the Company at
its Annuity Service Office, it will be voided as if it had never been in force.
Upon its return, the Company will refund the Contract Value, less the Bonus (see
"Bonus" on page 20) next computed after receipt of the Contract by the Company
at its Annuity Service Office, except in the following circumstances: (a) when
the Contract is purchased pursuant to an Individual Retirement Annuity; (b) in
those states which require the Company to refund Purchase Payments, less
withdrawals; or (c) in the case of Contracts which are deemed by certain states
to be replacing an existing annuity or insurance contract and which require the
Company to refund Purchase Payments, less withdrawals. With respect to the
circumstances described in (a), (b), and (c) above, the Company will refund the
greater of Purchase Payments, less any withdrawals, or the Contract Value, less
the Bonus, and will allocate initial Purchase Payments to the State Street
Global Advisors Money Market Sub-Account until the expiration of 15 days from
the Issue Date (or 25 days in the case of Contracts described under (c) above).
Upon the expiration of the 15-day period (or 25-day period with respect to
Contracts described under (c) above), the Sub-Account value of the State Street
Global Advisors Money Market Sub-Account will be allocated to the Separate
Account and the General Account in accordance with the election made by the
Owner in the Application.
 
     Each Valuation Period, the Company deducts a Mortality and Expense Risk
Charge from the Separate Account which is equal, on an annual basis, to 1.25% of
the average daily net asset value of the Separate Account. This charge
compensates the Company for assuming the mortality and expense risks under the
Contracts. (See "Charges and Deductions -- Deduction for Mortality and Expense
Risk Charge.")
 
     An Owner may choose between the Standard Death Benefit, the Enhanced Death
Benefit or, for Contracts issued on or after June 1, 1998, the Annual Step-Up
Death Benefit.
 
     If the Owner selects the Enhanced Death Benefit, each Valuation Period
prior to the 75th birthday of the Owner, or oldest Joint Owner, the Company
deducts an Enhanced Death Benefit Charge from the Separate Account which is
equal, on an annual basis, to .05% of the average daily net asset value of the
Separate Account. This charge compensates the Company for assuming the mortality
risks for the Enhanced Death Benefit. (See "Charges and Deductions -- Deduction
for Enhanced Death Benefit Charge.")
 
     If the Owner selects the Annual Step-Up Death Benefit, each Valuation
Period prior to the 75th birthday of the Owner, or Oldest Joint Owner, the
Company deducts an Annual Step-Up Death Benefit charge from the Separate Account
which is equal, on an annual basis, to .10% of the average daily net asset value
of the Separate Account. This charge compensates the Company for assuming the
mortality risks for the Annual Step-Up Death Benefit. (See "Charges and
Deduction -- Deduction for Annual Step-Up Death Benefit.") This benefit may not
be available in your state. (Check with your registered representative regarding
availability.)
 
     Each Valuation Period, the Company deducts an Administrative Charge from
the Separate Account which is equal, on an annual basis, to .15% of the average
daily net asset value of the Separate Account. This charge compensates the
Company for costs associated with the administration of the Contracts and the
Separate Account. (See "Charges and Deductions -- Deduction for Administrative
Charge.")
 
                                        3
<PAGE>   9
 
     On each Contract Anniversary, the Company deducts a Contract Maintenance
Charge of $30 from the Contract Value by subtracting values from the General
Account and/or by canceling Accumulation Units from each applicable Sub-Account.
However, during the Accumulation Period, if the Contract Value on the Contract
Anniversary is at least $40,000, then no Contract Maintenance Charge is
deducted. If a total withdrawal is made on other than a Contract Anniversary and
the Contract Value for the Valuation Period during which the total withdrawal is
made is less than $40,000, the full Contract Maintenance Charge will be deducted
at the time of the total withdrawal. During the Annuity Period, the Contract
Maintenance Charge will be deducted pro rata from Annuity Payments regardless of
Contract size and will result in a reduction of each Annuity Payment. (See
"Charges and Deductions -- Deduction for Contract Maintenance Charge.")
 
     Premium taxes will be charged against the Contract. Some states assess
premium taxes when Purchase Payments are made. Other states assess premium taxes
upon annuitization. It is the Company's current practice to deduct for premium
taxes when they become due and payable to the states. (See "Charges and
Deductions -- Deduction for Premium and Other Taxes.")
 
     The Company will, at the time of the initial Purchase Payment and, as of
June 1, 1998 (subject to state regulatory approval), for certain subsequent
Purchase Payments, add an additional amount as a bonus (the "Bonus"), equal to
1% of such Purchase Payment made under the Contract. A Bonus will be paid for
subsequent Purchase Payments of at least $5,000 for Non-Qualified Contracts or
$2,000 for Qualified Contracts. The Bonus will not be paid for subsequent
Purchase Payments made prior to June 1, 1998. Such additional amount will be
allocated to the Sub-Accounts of the Separate Account and/or the General Account
in the same manner as the Purchase Payment. If the Owner makes a withdrawal
prior to the seventh Contract year after any applicable Purchase Payment in
excess of (a) 10% of the Contract Value each Contract Year or (b) the amount
permitted under the Systematic Withdrawal Option (see "Withdrawals -- Systematic
Withdrawal Option"), an amount equal to the Bonus allocable to such Purchase
Payment withdrawn will be deducted by the Company from the Contract Value. (See
"Purchase Payments and Contract Value -- Bonus.")
 
     There is a 10% federal income tax penalty that may be applied to the income
portion of any distribution from the Contracts. However, under certain
circumstances, the penalty is not imposed. (See "Federal Tax Status -- Tax
Treatment of Withdrawals -- Non-Qualified Contracts" and "Tax Treatment of
Withdrawals -- Qualified Contracts.") For a further discussion of the taxation
of the Contracts, see "Federal Tax Status."
 
     For Contracts purchased in connection with 403(b) plans, withdrawals of
amounts attributable to contributions made pursuant to a salary reduction
agreement (as defined in Section 403(b)(11) of the Internal Revenue Code) are
limited to circumstances only when the Owner: (a) attains age 59 1/2; (b)
separates from service; (c) dies; (d) becomes disabled (within the meaning of
Section 72(m)(7) of the Internal Revenue Code); or (e) in the case of hardship.
Withdrawals for hardship are restricted to the portion of the Owner's Contract
Value which represents contributions made by the Owner and does not include any
investment results. The limitations on withdrawals became effective on January
1, 1989, and apply only to: (a) salary reduction contributions made after
December 31, 1988; (b) income attributable to such contributions; and (c) income
attributable to amounts held as of December 31, 1988. The limitations on
withdrawals do not affect rollovers or transfers between certain Qualified
Plans. Tax penalties may also apply. (See "Federal Tax Status -- Tax Treatment
of Withdrawals -- Qualified Contracts.") Owners should consult their own tax
counsel or other tax adviser regarding any distributions. (See "Federal Tax
Status -- Tax-Sheltered Annuities -- Withdrawal Limitations.")
 
     See "Federal Tax Status -- Diversification" for a discussion of owner
control of the underlying investments in a Variable Annuity contract.
 
     Because of certain exemptive and exclusionary provisions, interests in the
General Account are not registered under the Securities Act of 1933 and the
General Account is not registered as an investment company under the Investment
Company Act of 1940, as amended. Accordingly, neither the General Account nor
any interests therein are subject to the provisions of these acts, and the
Company has been advised that the staff of the SEC has not reviewed the
disclosures in the Prospectus relating to the General Account.
                                        4
<PAGE>   10
 
Disclosures regarding the General Account may, however, be subject to certain
generally applicable provisions of the federal securities laws relating to the
accuracy and completeness of statements made in prospectuses.
 
                        AGA SEPARATE ACCOUNT A FEE TABLE
 
                      CONTRACT OWNER TRANSACTION EXPENSES
 
<TABLE>
<CAPTION>
                                      LENGTH OF TIME                     CHARGE
                                   FROM PURCHASE PAYMENT          (AS A PERCENTAGE OF
CONTINGENT DEFERRED SALES CHARGE     (NUMBER OF YEARS)             AMOUNT WITHDRAWN)
       (SEE NOTE 2 BELOW)          ---------------------          -------------------
<S>                                <C>                     <C>
                                          1                                5%
                                          2                                5%
                                          3                                5%
                                          4                                4%
                                          5                                3%
                                          6                                2%
                                          7                                1%
                                      8 or more                            0%
Transfer Fee (see Note 3
  below).........................                                         None
Contract Maintenance Charge (see
  Note 4 below)..................                          $30 per Contract per Contract Year
</TABLE>
 
                        SEPARATE ACCOUNT ANNUAL EXPENSES
                   (AS A PERCENTAGE OF AVERAGE ACCOUNT VALUE)
 
<TABLE>
<S>                                                           <C>
Mortality and Expense Risk Charge...........................  1.25%
Administrative Charge.......................................   .15%
                                                              ----
Total Separate Account Annual Expenses......................  1.40%
</TABLE>
 
                   OPTIONAL SEPARATE ACCOUNT ANNUAL EXPENSES
                   (AS A PERCENTAGE OF AVERAGE ACCOUNT VALUE)
 
<TABLE>
<S>                                                           <C>
Enhanced Death Benefit Charge (see Note 5 below)............  .05%
Annual Step-Up Death Benefit Charge (see Note 5 below)......  .10%
</TABLE>
 
                       INVESTMENT OPTION ANNUAL EXPENSES
        (AS A PERCENTAGE OF THE AVERAGE DAILY NET ASSETS OF A PORTFOLIO)
 
AGA SERIES TRUST
 
   
<TABLE>
<CAPTION>
                                                                       OTHER EXPENSES    TOTAL ANNUAL
                                                         MANAGEMENT    (AFTER EXPENSE     PORTFOLIOS
                                                           FEES*      REIMBURSEMENT)**     EXPENSES
                                                         ----------   ----------------   ------------
<S>                                                      <C>          <C>                <C>
Credit Suisse Growth and Income Portfolio..............      .75%           .12%              .87%
Credit Suisse International Equity Portfolio...........      .90%           .12%             1.02%
EliteValue Portfolio...................................      .65%           .12%              .77%
State Street Global Advisors Growth Equity Portfolio...      .61%           .12%              .73%
State Street Global Advisors Money Market Portfolio....      .45%           .12%              .57%
Salomon Brothers U.S. Government Securities
  Portfolio............................................     .475%           .12%             .595%
Van Kampen Emerging Growth Portfolio...................      .75%           .12%              .87%
</TABLE>
    
 
- ---------------
 
 * AGA Investment Advisory Services, Inc., the Trust's investment adviser
   ("Adviser"), agreed to waive that portion of its management fees which is in
   excess of the amount payable by the Adviser to each Sub-Adviser pursuant to
   the respective sub-advisory agreements for each Portfolio until May 1, 1998.
   Thereafter, the fees shown in the table above will be charged. (See the Trust
   prospectus for more information on advisory and sub-advisory fees.) The
   examples below are calculated based upon the deduction of the full management
   fees.
 
                                        5
<PAGE>   11
 
   
** The Company has undertaken to reimburse each Portfolio for all operating
   expenses, excluding management fees, that exceed .12% of each Portfolio's
   average daily net assets until May 1, 1999. Had the Company not reimbursed
   such expenses for the year ended December 31, 1997, the ratio of other
   expenses as a percentage of average net assets of each Portfolio would have
   been: 2.51% for the Credit Suisse Growth and Income Portfolio; 4.16% for the
   Credit Suisse International Equity Portfolio; 2.11% for the EliteValue
   Portfolio; 2.68% for the State Street Global Advisors Growth Equity
   Portfolio; 3.72% for the State Street Global Advisors Money Market Portfolio;
   4.36% for the Salomon Brothers U.S. Government Securities Portfolio; and
   4.90% for the Van Kampen Emerging Growth Portfolio. The examples below are
   calculated based upon such reimbursement of expenses.
    
 
AIM VARIABLE INSURANCE FUNDS, INC.
 
<TABLE>
<CAPTION>
                                                                                        TOTAL ANNUAL
                                                     MANAGEMENT FEES   OTHER EXPENSES     EXPENSES
                                                     ---------------   --------------   ------------
<S>                                                  <C>               <C>              <C>
AIM V.I. Diversified Income Fund*..................        .60%             .20%            .80%
AIM V.I. Capital Appreciation Fund*................        .63%             .05%            .68%
</TABLE>
 
- ---------------
 
* A I M Advisors, Inc. ("AIM") may from time to time voluntarily waive or reduce
  its respective fees. Effective May 1, 1998, the Funds reimburse AIM in an
  amount up to .25% of the average net asset value of each Fund, for expenses
  incurred in providing, or assuring that participating insurance companies
  provide, certain administrative services. Currently, the fee only applies to
  the average net asset value of each Fund in excess of the net asset value of
  each Fund as calculated on April 30, 1998.
 
OPPENHEIMER VARIABLE ACCOUNT FUNDS
 
<TABLE>
<CAPTION>
                                                                                        TOTAL ANNUAL
                                                     MANAGEMENT FEES   OTHER EXPENSES     EXPENSES
                                                     ---------------   --------------   ------------
<S>                                                  <C>               <C>              <C>
Oppenheimer High Income Fund.......................        .75%             .07%            .82%
Oppenheimer Growth Fund............................        .73%             .02%            .75%
Oppenheimer Small Cap Growth Fund*.................        .75%             .08%            .83%
Oppenheimer Growth & Income fund...................        .75%             .08%            .83%
</TABLE>
 
- ---------------
 
  * Because the Small Cap Growth Fund did not commence operations until May 1,
    1998, figures (other than management fees) are estimates for 1998 based on
    historical expenses of other small capitalization growth funds.
 
TEMPLETON VARIABLE PRODUCTS SERIES FUND, CLASS 2 SHARES
 
   
<TABLE>
<CAPTION>
                                                                                        TOTAL FUND
                                                                                         OPERATING
                                                MANAGEMENT   12B-1       OTHER        EXPENSES (AFTER
                                                   FEES      FEES       EXPENSES      REIMBURSEMENT)
                                                ----------   -----   --------------   ---------------
<S>                                             <C>          <C>     <C>              <C>
Templeton Developing Markets Fund*............     1.25%      .25%        .33%             1.83%
Templeton International Fund**................      .69%      .25%        .19%             1.13%
</TABLE>
    
 
- ---------------
 
   
   * Class 2 shares of the Fund has a distribution plan or "Rule 12b-1 plan".
     Because Class 2 shares were not offered until May 1, 1997, figures (other
     than 12b-1 fees) are estimates for 1998 based on the historical expenses of
     the Fund's Class 1 shares for the fiscal year ended December 31, 1997.
    
 
   
  ** Class 2 shares of the Fund has a distribution plan or "Rule 12b-1 plan".
     Because Class 2 shares were not offered until May 1, 1997, figures (other
     than 12b-1 fees) are estimates for 1998 based on the historical expenses of
     the Fund's Class 1 shares for the fiscal year ended December 31, 1997.
     Management Fees and Total Fund Operating Expenses have been restated to
     reflect the management fee schedule approved by shareholders and effective
     May 1, 1997. Actual Management Fees and Total Fund Operating Expenses
     before May 1, 1997 were lower.
    
 
                                        6
<PAGE>   12
 
                                    EXAMPLES
 
       CALCULATED WITHOUT ENHANCED DEATH BENEFIT CHARGE OR ANNUAL STEP-UP
                                 BENEFIT CHARGE
 
     A Contract Owner would pay the following expenses on a $1,000 investment,
assuming a 5% annual return on assets: (a) if the Contract is surrendered at the
end of each time period or (b) if the Contract is not surrendered or if the
Contract is annuitized.
 
   
<TABLE>
<CAPTION>
                                                                           TIME PERIODS
                                                            -------------------------------------------
                                                                  1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                                  ------   -------   -------   --------
<S>                                                         <C>   <C>      <C>       <C>       <C>
Credit Suisse Growth and Income Sub-Account...............  a)     $75      $125      $161       $278
                                                            b)      25        76       131        278
Credit Suisse International Equity Sub-Account............  a)      76       130       168        293
                                                            b)      26        81       138        293
EliteValue Sub-Account....................................  a)      67       104       122        199
                                                            b)      17        54        92        199
State Street Global Advisors Growth Equity                  a)      73       121       153        263
  Sub-Account.............................................  b)      23        72       123        263
State Street Global Advisors Money Market                   a)      72       117       145        247
  Sub-Account.............................................  b)      22        67       115        247
Salomon Brothers U.S. Government Securities Sub-Account...  a)      75       125       161        278
                                                            b)      25        76       131        278
Van Kampen Emerging Growth Sub-Account....................  a)      72       117       147        250
                                                            b)      22        68       117        250
AIM V.I. Diversified Income Sub-Account...................  a)      74       123        --         --
                                                            b)      24        74        --         --
AIM V.I. Capital Appreciation Sub-Account.................  a)      73       120        --         --
                                                            b)      23        71        --         --
Oppenheimer High Income Sub-Account.......................  a)      74       124        --         --
                                                            b)      24        75        --         --
Oppenheimer Growth Sub-Account............................  a)      74       122        --         --
                                                            b)      24        73        --         --
Oppenheimer Small Cap Growth Sub-Account..................  a)      74       124        --         --
                                                            b)      24        75        --         --
Oppenheimer Growth & Income Sub-Account...................  a)      74       124        --         --
                                                            b)      24        75        --         --
Templeton Developing Markets Sub-Account..................  a)      84       152        --         --
                                                            b)      34       105        --         --
Templeton International Sub-Account.......................  a)      77       133        --         --
                                                            b)      27        84        --         --
</TABLE>
    
 
                                        7
<PAGE>   13
 
                 CALCULATED WITH ENHANCED DEATH BENEFIT CHARGE
 (SEE "CHARGES AND DEDUCTIONS -- DEDUCTION FOR ENHANCED DEATH BENEFIT CHARGE.")
 
     A Contract Owner would pay the following expenses on a $1,000 investment,
assuming a 5% annual return on assets: (a) if the Contract is surrendered at the
end of each time period or (b) if the Contract is not surrendered or if the
Contract is annuitized.
 
   
<TABLE>
<CAPTION>
                                                                           TIME PERIODS
                                                            -------------------------------------------
                                                                  1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                                  ------   -------   -------   --------
<S>                                                         <C>   <C>      <C>       <C>       <C>
Credit Suisse Growth and Income Sub-Account...............  a)     $75      $127      $163       $283
                                                            b)      25        78       133        283
Credit Suisse International Equity Sub-Account............  a)      77       131       171        298
                                                            b)      27        82       141        298
EliteValue Sub-Account....................................  a)      68       105       125        205
                                                            b)      18        55        95        205
State Street Global Advisors Growth Equity                  a)      74       123       156        269
  Sub-Account.............................................  b)      24        74       126        269
State Street Global Advisors Money Market                   a)      72       118       148        252
  Sub-Account.............................................  b)      22        69       118        252
Salomon Brothers                                            a)      75       127       163        283
  U.S. Government Securities Sub-Account..................  b)      25        78       133        283
Van Kampen Emerging Growth Sub-Account....................  a)      73       119       149        255
b)                                                          23      70       119       255
AIM V.I. Diversified Income Sub-Account...................  a)      75       125        --         --
                                                            b)      25        76        --         --
AIM V.I. Capital Appreciation Sub-Account.................  a)      73       121        --         --
                                                            b)      23        72        --         --
Oppenheimer High Income Sub-Account.......................  a)      75       125        --         --
                                                            b)      25        76        --         --
Oppenheimer Growth Sub-Account............................  a)      74       123        --         --
                                                            b)      24        74        --         --
Oppenheimer Small Cap Growth Sub-Account..................  a)      75       126        --         --
                                                            b)      25        77        --         --
Oppenheimer Growth & Income Sub-Account...................  a)      75       126        --         --
                                                            b)      25        77        --         --
Templeton Developing Markets Sub-Account..................  a)      85       154        --         --
                                                            b)      35       106        --         --
Templeton International Sub-Account.......................  a)      78       134        --         --
                                                            b)      28        86        --         --
</TABLE>
    
 
                                        8
<PAGE>   14
 
              CALCULATED WITH ANNUAL STEP-UP DEATH BENEFIT CHARGE
   (SEE "CHARGES AND DEDUCTIONS -- DEDUCTION FOR ANNUAL STEP-UP DEATH BENEFIT
                                   CHARGE.")
 
     A Contract Owner would pay the following expenses on a $1,000 investment,
assuming a 5% annual return on assets: (a) if the Contract is surrendered at the
end of each time period or (b) if the Contract is not surrendered or if the
Contract is annuitized.
 
   
<TABLE>
<CAPTION>
                                                                           TIME PERIODS
                                                            -------------------------------------------
                                                                  1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                                  ------   -------   -------   --------
<S>                                                         <C>   <C>      <C>       <C>       <C>
Credit Suisse Growth and Income Sub-Account...............  a)     $76      $128      $166       $288
                                                            b)      26        79       136        288
Credit Suisse International Equity Sub-Account............  a)      77       132       173        302
                                                            b)      27        84       143        302
EliteValue Sub-Account....................................  a)      68       106       127        210
                                                            b)      18        57        97        210
State Street Global Advisors Growth Equity                  a)      74       124       159        274
  Sub-Account.............................................  b)      24        75       129        274
State Street Global Advisors Money Market                   a)      73       119       150        257
  Sub-Account.............................................  b)      23        70       120        257
Salomon Brothers                                            a)      76       128       166        288
  U.S. Government Securities Sub-Account..................  b)      26        79       136        288
Van Kampen Emerging Growth Sub-Account....................  a)      73       120       152        260
                                                            b)      23        71       122        260
AIM V.I. Diversified Income Sub-Account...................  a)      75       126        --         --
                                                            b)      25        77        --         --
AIM V.I. Capital Appreciation Sub-Account.................  a)      74       123        --         --
                                                            b)      24        74        --         --
Oppenheimer High Income Sub-Account.......................  a)      75       127        --         --
                                                            b)      25        78        --         --
Oppenheimer Growth Sub-Account............................  a)      75       125        --         --
                                                            b)      25        76        --         --
Oppenheimer Small Cap Growth Sub-Account..................  a)      75       127        --         --
                                                            b)      25        78        --         --
Oppenheimer Growth & Income Sub-Account...................  a)      75       127        --         --
                                                            b)      25        78        --         --
Templeton Developing Markets Sub-Account..................  a)      85       155        --         --
                                                            b)      35       108        --         --
Templeton International Sub-Account.......................  a)      78       135        --         --
                                                            b)      28        87        --         --
</TABLE>
    
 
NOTES TO FEE TABLE AND EXAMPLES
 
1. The purpose of the Fee Table is to assist Owners in understanding the various
   costs and expenses that an Owner will incur directly or indirectly. For
   additional information, see "Charges and Deductions" in this Prospectus and
   the Prospectuses for the Investment Options. The Fee Table reflects expenses
   of the Separate Account as well as the Investment Options.
 
2. After the first Contract Anniversary, a withdrawal of up to 10% of the
   Contract Value, determined as of the immediately preceding Contract
   Anniversary, may be withdrawn once each Contract Year on a non-cumulative
   basis without the imposition of the Contingent Deferred Sales Charge. The
   Systematic Withdrawal Option may be selected in lieu of the 10% free
   withdrawal amount. (See "Withdrawals -- Systematic Withdrawal Option.")
 
                                        9
<PAGE>   15
 
3. Currently, no transfer fee is imposed on transfers. The Company reserves the
   right to impose such a fee in the future which will not exceed the lesser of
   $25 or 2% of the amount transferred.
 
4. During the Accumulation Period, if the Contract Value on the Contract
   Anniversary is at least $40,000, then no Contract Maintenance Charge is
   deducted. If a total withdrawal is made on other than a Contract Anniversary
   and the Contract Value for the Valuation Period during which the total
   withdrawal is made is less than $40,000, the full Contract Maintenance Charge
   will be deducted at the time of the total withdrawal. During the Annuity
   Period, the full charge will be deducted regardless of Contract size.
 
5. An Owner may elect one of the following death benefits: the Standard Death
   Benefit, the Enhanced Death Benefit or, for Contracts issued on or after June
   1, 1998, the Annual Step-Up Death Benefit. There are three sets of Examples
   above. One set has been calculated for the Standard Death Benefit, another
   with the Enhanced Death Benefit Charge and a third with the Annual Step-Up
   Death Benefit Charge. In certain states, the Annual Step-Up Death Benefit may
   not be available.
 
6. Premium taxes are not reflected. Premium taxes may apply. (See "Charges and
   Deductions -- Deduction for Premium and Other Taxes.")
 
7. The examples should not be considered a representation of past or future
   expenses. Actual expenses may be more or less than those shown.
 
                    This space is intentionally left blank.
                                       10
<PAGE>   16
 
                        CONDENSED FINANCIAL INFORMATION
                            ACCUMULATION UNIT VALUES
 
     The following schedule includes Accumulation Unit Values for the periods
indicated. This data has been extracted from the Separate Account's Financial
Statements. The Separate Account's Financial Statements have been audited by
Ernst & Young L.L.P., independent certified public accountants, whose report
thereon is included in the SAI. This information should be read in conjunction
with the Separate Account's Financial Statements and related notes thereto,
which are included in the SAI. Two sets of unit values are presented, one with
the Enhanced Death Benefit Charge of .15%, (which was the charge for the
Enhanced Death Benefit as of December 31, 1995, 1996 and 1997) and one without
the Enhanced Death Benefit Charge. There are no unit values presented for
Contracts with the Annual Step-Up Death Benefit Charge because the Annual Step-
Up Death Benefit first became available under the Contracts on June 1, 1998.
 
<TABLE>
<CAPTION>
                                                         WITHOUT ENHANCED DEATH   WITH ENHANCED DEATH
                                                             BENEFIT CHARGE         BENEFIT CHARGE
                                                         ----------------------   -------------------
<S>                                                      <C>                      <C>
CREDIT SUISSE GROWTH AND INCOME SUB-ACCOUNT
  FOR PERIOD ENDED 12/31/95
  Unit value at beginning of period (10/20/95).........        $    10.00           Not Applicable
  Unit value at end of period..........................        $    10.62           Not Applicable
  Number of units outstanding at end of period.........             461.8           Not Applicable
  FOR YEAR ENDED 12/31/96
  Unit value at beginning of period....................        $    10.62           $        10.62
  Unit value at end of period..........................        $    11.92           $        11.90
  Number of units outstanding at end of period.........          48,634.3                 11,709.8
  FOR YEAR ENDED 12/31/97
  Unit value at beginning of period....................        $    11.92           $        11.90
  Unit value at end of period..........................        $    14.38           $        14.33
  Number of units outstanding at end of period.........         262,116.1                 44,598.0
CREDIT SUISSE INTERNATIONAL EQUITY SUB-ACCOUNT
  FOR PERIOD ENDED 12/31/95
  Unit value at beginning of period (10/20/95).........        $    10.00           Not Applicable
  Unit value at end of period..........................        $    10.36           Not Applicable
  Number of units outstanding at end of period.........             430.6           Not Applicable
  FOR YEAR ENDED 12/31/96
  Unit value at beginning of period....................        $    10.36           $        10.36
  Unit value at end of period..........................        $    11.90           $        11.88
  Number of units outstanding at end of period.........          17,186.2                  8,510.2
  FOR YEAR ENDED 12/31/97
  Unit value at beginning of period....................        $    11.90           $        11.88
  Unit value at end of period..........................        $    12.24           $        12.20
  Number of units outstanding at end of period.........         126,400.0                 19,510.4
ELITEVALUE SUB-ACCOUNT
  FOR PERIOD ENDED 12/31/96
  Unit value at beginning of period (1/2/96)...........        $    10.00           $        10.00
  Unit value at end of period..........................        $    12.45           $        12.43
  Number of units outstanding at end of period.........          69,575.7                 13,965.2
  FOR YEAR ENDED 12/31/97
  Unit value at beginning of period....................        $    12.45           $        12.43
  Unit value at end of period..........................        $    14.87           $        14.82
  Number of units outstanding at end of period.........         461,930.1                 72,104.8
STATE STREET GLOBAL ADVISORS GROWTH EQUITY SUB-ACCOUNT
  FOR PERIOD ENDED 12/31/95
  Unit value at beginning of period (10/20/95).........        $    10.00           Not Applicable
  Unit value at end of period..........................        $    10.33           Not Applicable
</TABLE>
 
                                       11
<PAGE>   17
 
   
<TABLE>
<CAPTION>
                                                         WITHOUT ENHANCED DEATH   WITH ENHANCED DEATH
                                                             BENEFIT CHARGE         BENEFIT CHARGE
                                                         ----------------------   -------------------
<S>                                                      <C>                      <C>
  Number of units outstanding at end of period.........             124.2           Not Applicable
  FOR YEAR ENDED 12/31/96
  Unit value at beginning of period....................        $    10.33           $        10.33
  Unit value at end of period..........................        $    12.35           $        12.33
  Number of units outstanding at end of period.........          68,154.9                  5,232.7
  FOR YEAR ENDED 12/31/97
  Unit value at beginning of period....................        $    12.35           $        12.33
  Unit value at end of period..........................        $    16.04           $        15.99
  Number of units outstanding at end of period.........         231,208.0                 19,281.5
STATE STREET GLOBAL ADVISORS MONEY MARKET SUB-ACCOUNT
  FOR PERIOD ENDED 12/31/95
  Unit value at beginning of period (10/10/95).........        $    10.00           $        10.00
  Unit value at end of period..........................        $    10.09           $        10.08
  Number of units outstanding at end of period.........           2,464.4                     24.9
  FOR YEAR ENDED 12/31/96
  Unit value at beginning of period....................        $    10.09           $        10.08
  Unit value at end of period..........................        $    10.46           $        10.44
  Number of units outstanding at end of period.........         109,837.9                  3,403.7
  FOR YEAR ENDED 12/31/97
  Unit value at beginning of period....................        $    10.46           $        10.44
  Unit value at end of period..........................        $    10.88           $        10.84
  Number of units outstanding at end of period.........         444,954.0                 13,476.5
SALOMON BROTHERS U.S. GOVERNMENT SECURITIES SUB-ACCOUNT
  FOR PERIOD ENDED 12/31/96
  Unit value at beginning of period (2/6/96)...........        $    10.00           $        10.00
  Unit value at end of period..........................        $    10.16           $        10.14
  Number of units outstanding at end of period.........          15,638.1                 11,806.1
  FOR YEAR ENDED 12/31/97
  Unit value at beginning of period....................        $    10.16           $        10.14
  Unit value at end of period..........................        $    10.91           $        10.87
  Number of units outstanding at end of period.........         126,832.5                 32,205.2
VAN KAMPEN EMERGING GROWTH SUB-ACCOUNT
  FOR PERIOD ENDED 12/31/96
  Unit value at beginning of period (1/2/96)...........        $    10.00           $        10.00
  Unit value at end of period..........................        $    11.70           $        11.68
  Number of units outstanding at end of period.........         107,870.9                  2,072.6
  FOR YEAR ENDED 12/31/97
  Unit value at beginning of period....................        $    11.70           $        11.68
  Unit value at end of period..........................        $    13.90           $        13.85
  Number of units outstanding at end of period.........         303,011.2                 41,160.9
</TABLE>
    
 
     There are no unit values shown for Sub-Accounts investing in the Portfolios
of AIM Variable Insurance Funds, Inc., Oppenheimer Variable Account Funds and
Templeton Variable Products Series Fund because the Sub-Accounts were not
available as of December 31, 1997.
 
                                       12
<PAGE>   18
 
                                  THE COMPANY
 
     American General Annuity Insurance Company, which had $11.7 billion in
assets as of December 31, 1997, develops, markets, and issues annuity products
through niche distribution channels. It is a wholly owned subsidiary of Western
National Corporation. Effective February 25, 1998, Western National Corporation
became a wholly-owned subsidiary of AGC Life Insurance Company, a subsidiary of
American General Corporation. The Company markets single-premium deferred
annuities to the savings and retirement markets, flexible-premium deferred
annuities to the tax-qualified retirement market, and single-premium immediate
annuities to the structured settlement and retirement markets. The Company
primarily distributes its annuity products through financial institutions,
general agents, and specialty brokers.
 
     The Company, which was incorporated in Texas in 1944, is licensed to do
business in 47 states, Puerto Rico and the District of Columbia. Effective
February 25, 1998, the Company changed its name from Western National Life
Insurance Company to American General Annuity Insurance Company. The Company's
executive offices are located at 2929 Allen Parkway, Houston, Texas 77019. Its
telephone number is 713-526-5251.
 
                              THE SEPARATE ACCOUNT
 
     The Board of Directors of the Company adopted a resolution on November 9,
1994, to establish a segregated asset account pursuant to Texas insurance law.
This segregated asset account has been designated AGA Separate Account A (the
"Separate Account"). Prior to May 1, 1998, the Separate Account was known as WNL
Separate Account A. The Company has caused the Separate Account to be registered
with the SEC as a unit investment trust pursuant to the provisions of the
Investment Company Act of 1940.
 
     The assets of the Separate Account are the property of the Company.
However, the assets of the Separate Account, equal to the reserves and other
contract liabilities with respect to the Separate Account, are not chargeable
with liabilities arising out of any other business the Company may conduct.
Income, gains, and losses, whether or not realized, are, in accordance with the
Contracts, credited to or charged against the Separate Account without regard to
other income, gains, or losses of the Company. The Company's obligations arising
under the Contracts are general obligations.
 
     The Separate Account meets the definition of a "separate account" under
federal securities laws.
 
     The Separate Account is divided into Sub-Accounts. Each Sub-Account invests
in one Portfolio of an Investment Option. There is no assurance that the
investment objectives of any of the Portfolios will be met. Owners bear the
complete investment risk for Purchase Payments allocated to a Sub-Account.
Contract Values will fluctuate in accordance with the investment performance of
the Sub-Accounts to which Purchase Payments are allocated, and in accordance
with the imposition of the fees and charges assessed under the Contracts.
 
                               INVESTMENT OPTIONS
 
     Purchasers should read the Prospectuses for the Investment Options, which
are attached to this Prospectus, carefully before investing. Additional
Prospectuses and the SAIs can be obtained by calling or writing the Company at
its Annuity Service Office.
 
     Shares of the Investment Options may be offered in connection with certain
variable annuity contracts and variable life insurance policies of various life
insurance companies which may or may not be affiliated with the Company. Shares
of certain Investment Options may also be sold directly to qualified plans. The
Investment Options do not believe that offering their shares in this manner will
be disadvantageous to Owners.
 
AGA SERIES TRUST
 
     AGA Series Trust (formerly, WNL Series Trust) (the "Trust") has been
established to act as one of the funding vehicles for the Contracts offered. The
Trust is managed by AGA Investment Advisory Services, Inc.
 
                                       13
<PAGE>   19
 
   
(formerly, WNL Investment Advisory Services, Inc.) (the "Adviser"), an affiliate
of the Company. The Adviser has retained Sub-Advisers for each Portfolio to make
investment decisions and place orders. The Sub-Advisers for the Portfolios are:
BEA Associates, a subsidiary of Credit Suisse, for the Credit Suisse Growth and
Income Portfolio; Credit Suisse Asset Management Ltd. for the Credit Suisse
International Equity Portfolio; OpCap Advisors for the EliteValue Portfolio;
State Street Global Advisors for the State Street Global Advisors Growth Equity
Portfolio and the State Street Global Advisors Money Market Portfolio; Salomon
Brothers Asset Management Inc for the Salomon Brothers U.S. Government
Securities Portfolio; and Van Kampen Asset Management, Inc. for the Van Kampen
Emerging Growth Portfolio.
    
 
     The following Portfolios are available under the Contracts:
 
   
<TABLE>
<S>                             <C>
Credit Suisse Growth and
  Income Portfolio              (formerly, the BEA Growth and Income Portfolio)
Credit Suisse International
  Equity Portfolio
EliteValue Portfolio (an asset
  allocation portfolio)         (formerly, the EliteValue Asset Allocation Portfolio)
State Street Global Advisors
  Growth Equity Portfolio       (formerly, the Global Advisors Growth Equity Portfolio)
State Street Global Advisors
  Money Market Portfolio        (formerly, the Global Advisors Money Market Portfolio)
Salomon Brothers U.S.
  Government Securities
  Portfolio
Van Kampen Emerging Growth      (formerly, the Van Kampen American Capital Emerging
  Portfolio                     Growth Portfolio)
</TABLE>
    
 
AIM VARIABLE INSURANCE FUNDS, INC.
 
     AIM Variable Insurance Funds, Inc. is a mutual fund with thirteen
investment Portfolios. A I M Advisors, Inc. serves as the investment adviser to
the Portfolios. The following two Portfolios are available under the Contracts:
 
     AIM V.I. Diversified Income Fund
     AIM V.I. Capital Appreciation Fund
 
OPPENHEIMER VARIABLE ACCOUNT FUNDS
 
     Oppenheimer Variable Account Funds is a mutual fund consisting of ten
separate Portfolios. OppenheimerFunds, Inc. is the investment manager of the
Portfolios. The following four Portfolios are available under the Contracts:
 
     Oppenheimer High Income Fund
     Oppenheimer Growth Fund
     Oppenheimer Small Cap Growth Fund
     Oppenheimer Growth & Income Fund
 
TEMPLETON VARIABLE PRODUCTS SERIES FUND
 
   
     Templeton Variable Products Series Fund is a mutual fund with nine separate
investment portfolios. Templeton Variable Products Series Fund has two classes
of shares: Class 1 and Class 2. Only Class 2 shares are available in connection
with the Contracts offered by this Prospectus. Templeton Asset Management Ltd.
is the investment manager of the Templeton Developing Markets Fund and Templeton
Investment Counsel, Inc. is the investment manager of the Templeton
International Fund. The following two Portfolios are available in connection
with the Contracts:
    
 
   
     Templeton Developing Markets Fund
    
     Templeton International Fund
                                       14
<PAGE>   20
 
VOTING RIGHTS
 
     In accordance with its view of present applicable law, the Company will
vote the shares of the Investment Options held in the Separate Account at
special meetings of the shareholders in accordance with instructions received
from persons having the voting interest in the Separate Account. The Company
will vote shares for which it has not received instructions, as well as shares
attributable to it, in the same proportion as it votes shares for which it has
received instructions.
 
     The number of shares which a person has a right to vote will be determined
as of a date to be chosen by the Company not more than 60 days prior to a
shareholder meeting of an Investment Option. Voting instructions will be
solicited by written communication at least 10 days prior to the meeting.
 
SUBSTITUTION OF SECURITIES
 
     If the shares of an Investment Option (or any Portfolio within an
Investment Option or any other Investment Option or Portfolio) are no longer
available for investment by the Separate Account or, if in the judgment of the
Company's Board of Directors, further investment in the shares should become
inappropriate in view of the purpose of the Contracts, the Company may limit
further purchase of such shares or may substitute shares of another Investment
Option or Portfolio for shares already purchased under the Contracts. No
substitution of securities may take place without prior approval of the SEC and
under the requirements it may impose.
 
                             CHARGES AND DEDUCTIONS
 
     Various charges and deductions are made from the Contract Value and the
Separate Account. These charges and deductions are:
 
DEDUCTION FOR CONTINGENT DEFERRED SALES CHARGE (SALES LOAD)
 
     The Contracts do not provide for a front-end sales charge. However, if all
or a portion of the Contract Withdrawal Value (see "Withdrawals") is withdrawn,
a Contingent Deferred Sales Charge (sales load) will be calculated at the time
of each withdrawal and will be deducted from the Contract Value. This charge
reimburses the Company for expenses incurred in connection with the promotion,
sale, and distribution of the Contracts. The Contingent Deferred Sales Charge is
based upon the length of time from when each Purchase Payment was made as
follows:
 
<TABLE>
<CAPTION>
                                                                 CHARGE
 LENGTH OF TIME FROM                                       (AS A PERCENTAGE OF
  PURCHASE PAYMENT                                               AMOUNT
  (NUMBER OF YEARS)                                            WITHDRAWN)
 -------------------                                       -------------------
<S>                                                              <C>
        1...............................................            5%
        2...............................................            5%
        3...............................................            5%
        4...............................................            4%
        5...............................................            3%
        6...............................................            2%
        7...............................................            1%
     8 or more..........................................            0%
</TABLE>
 
                                       15
<PAGE>   21
 
     After the first Contract Anniversary, a withdrawal of up to 10% of the
Contract Value, determined as of the immediately preceding Contract Anniversary,
may be withdrawn once each Contract Year on a non-cumulative basis without the
imposition of the Contingent Deferred Sales Charge (the "Free Withdrawal
Amount"). The Systematic Withdrawal Option may be selected in lieu of the Free
Withdrawal Amount. (See "Withdrawals -- Systematic Withdrawal Option.")
 
REDUCTION OR ELIMINATION OF THE CONTINGENT DEFERRED SALES CHARGE
 
     The amount of the Contingent Deferred Sales Charge may be reduced or
eliminated when sales of the Contracts are made to individuals or to a group of
individuals in a manner that results in savings of sales expenses. The
entitlement to a reduction of the Contingent Deferred Sales Charge will be
determined by the Company after examination of all the relevant factors, such
as:
 
          1. The size and type of group to which sales are to be made will be
     considered. Generally, the sales expenses for a larger group are less than
     for a smaller group because of the ability to implement large numbers of
     Contracts with fewer sales contacts;
 
          2. The total amount of Purchase Payments to be received will be
     considered. Per Contract sales expenses are likely to be less on larger
     Purchase Payments than on smaller ones;
 
          3. Any prior or existing relationship with the Company will be
     considered. Per Contract sales expenses are likely to be less when there is
     a prior existing relationship because of the likelihood of implementing the
     Contract with fewer sales contacts; and
 
          4. There may be other circumstances, of which the Company is not
     presently aware, which could result in reduced sales expenses.
 
     If, after consideration of the foregoing factors, the Company determines
that there will be a reduction in sales expenses, the Company may provide for a
reduction or elimination of the Contingent Deferred Sales Charge.
 
     The Contingent Deferred Sales Charge may be eliminated when the Contracts
are issued to an officer, director, or employee of the Company or any of its
affiliates. In no event will reductions or elimination of the Contingent
Deferred Sales Charge be permitted where reductions or elimination will be
unfairly discriminatory to any person.
 
DEDUCTION FOR MORTALITY AND EXPENSE RISK CHARGE
 
     Each Valuation Period, the Company deducts a Mortality and Expense Risk
Charge from the Separate Account which is equal, on an annual basis, to 1.25% of
the average daily net asset value of the Separate Account. The mortality risks
assumed by the Company arise from its contractual obligation to make Annuity
Payments after the Annuity Date (determined in accordance with the Annuity
Option chosen by the Owner), regardless of how long all Annuitants live. This
assures that neither an Annuitant's own longevity, nor an improvement in life
expectancy greater than that anticipated in the mortality tables, will have any
adverse effect on the Annuity Payments the Annuitant will receive under the
Contract. Further, the Company bears a mortality risk in that it guarantees the
annuity purchase rates for the Annuity Options under the Contract, whether for a
Fixed Annuity or a Variable Annuity. Also, the Company bears a mortality risk
with respect to the death benefit and with respect to the waiver of the
Contingent Deferred Sales Charge if Purchase Payments have been held in the
Contract less than seven years. The expense risk assumed by the Company is that
all actual expenses involved in administering the Contracts, including Contract
maintenance costs, administrative costs, mailing costs, data processing costs,
legal fees, accounting fees, filing fees, and the costs of other services, may
exceed the amount recovered from the Contract Maintenance Charge and the
Administrative Charge.
 
     The Mortality and Expense Risk Charge is guaranteed by the Company and
cannot be increased.
 
                                       16
<PAGE>   22
 
DEDUCTION FOR ENHANCED DEATH BENEFIT CHARGE
 
     If the Owner selects the Enhanced Death Benefit, each Valuation Period
prior to the 75th birthday of the Owner or oldest Joint Owner, the Company
deducts an Enhanced Death Benefit Charge from the Separate Account which is
equal, on an annual basis, to .05% of the average daily net asset value of the
Separate Account. This charge compensates the Company for assuming the mortality
risks for the Enhanced Death Benefit. (See "Proceeds Payable on
Death -- Enhanced Death Benefit Amount During the Accumulation Period.")
 
DEDUCTION FOR ANNUAL STEP-UP DEATH BENEFIT CHARGE
 
     For Contracts issued on or after June 1, 1998, an Owner may select the
Annual Step-Up Death Benefit in states where it is available (check with your
registered representative regarding availability). If the Owner selects the
Annual Step-Up Death Benefit, each Valuation Period prior to the 75th birthday
of the Owner or the oldest Joint Owner, the Company deducts an Annual Step-Up
Death Benefit Charge from the Separate Account which is equal, on an annual
basis, to .10% of the average daily net asset value of the Separate Account.
This charge compensates the Company for assuming the mortality risks for the
Annual Step-Up Death Benefit. (See "Proceeds Payable on Death -- Annual Step-Up
Death Benefit Amount During the Accumulation Period.")
 
DEDUCTION FOR ADMINISTRATIVE CHARGE
 
     Each Valuation Period, the Company deducts an Administrative Charge from
the Separate Account which is equal, on an annual basis, to .15% of the average
daily net asset value of the Separate Account. This charge, together with the
Contract Maintenance Charge (see below), is to reimburse the Company for the
expenses it incurs in the establishment and maintenance of the Contracts and the
Separate Account. These expenses include, but are not limited to: preparation of
the Contracts, confirmations, annual reports and statements: maintenance of
Owner records; maintenance of Separate Account records; administrative personnel
costs; mailing costs; data processing costs; legal fees; accounting fees; filing
fees; the costs of other services necessary for Owner servicing; and all
accounting, valuation, regulatory, and reporting requirements.
 
DEDUCTION FOR CONTRACT MAINTENANCE CHARGE
 
     On each Contract Anniversary, the Company deducts a Contract Maintenance
Charge from the Contract Value by subtracting values from the General Account
and/or by canceling Accumulation Units from each applicable Sub-Account to
reimburse it for expenses relating to maintenance of the Contracts. The Contract
Maintenance Charge is currently $30 each Contract Year. However, during the
Accumulation Period, if the Contract Value on the Contract Anniversary is at
least $40,000, then no Contract Maintenance Charge is deducted. If a total
withdrawal is made on other than a Contract Anniversary and the Contract Value
for the Valuation Period during which the total withdrawal is made is less than
$40,000, the full Contract Maintenance Charge will be deducted at the time of
the total withdrawal. During the Annuity Period, the Contract Maintenance Charge
will be deducted pro rata from Annuity Payments, regardless of Contract size and
will result in a reduction of each Annuity Payment. The Contract Maintenance
Charge will be deducted from the General Account and the Sub-Accounts in the
Separate Account in the same proportion that the amount of the Contract Value in
the General Account and each Sub-Account bears to the total Contract Value.
 
DEDUCTION FOR PREMIUM AND OTHER TAXES
 
     Any taxes, including any premium taxes, paid to any governmental entity
relating to the Contracts, may be deducted from the Purchase Payments or
Contract Value when incurred. The Company will, in its sole discretion,
determine when taxes have resulted from: the investment experience of the
Separate Account, receipt by the Company of the Purchase Payments, or
commencement of Annuity Payments. The Company may, at its sole discretion, pay
taxes when due and deduct that amount from the Contract Value at a later date.
Payment at an earlier date does not waive any right the Company may have to
deduct amounts at a later
 
                                       17
<PAGE>   23
 
date. The Company's current practice is to deduct for premium taxes when they
become due and payable to the states. Premium taxes generally range from 0% to
4%. While the Company is not currently maintaining a provision for federal
income taxes with respect to the Separate Account, the Company has reserved the
right to establish a provision for income taxes if it determines, in its sole
discretion, that it will incur a tax as a result of the operation of the
Separate Account. The Company will deduct for any income taxes incurred by it as
a result of the operation of the Separate Account, whether or not there was a
provision for taxes and whether or not it was sufficient.
 
     The Company will deduct any withholding taxes required by applicable law.
 
DEDUCTION FOR EXPENSES OF THE INVESTMENT OPTIONS
 
     There are other deductions from, and expenses (including management fees
paid to the investment advisers and other expenses) paid out of, the assets of
the Investment Options which are described in the Prospectuses for the
Investment Options.
 
                                 THE CONTRACTS
 
OWNER
 
     The Owner has all rights and may receive all benefits under the Contract.
The Owner is the person designated as such on the Issue Date, unless changed.
The Company will not issue a Contract to any Owner older than 85 years.
 
     The Owner may change owners at any time prior to the Annuity Date by
Written Request. A change of Owner will automatically revoke any prior
designation of Owner. The change will become effective as of the date the
Written Request is signed. A new designation of Owner will not apply to any
payment made or action taken by the Company prior to the time it was received.
 
     An Owner may make inquiries regarding his or her Contract by telephone or
in writing to the Annuity Service Office listed on the cover page of this
Prospectus.
 
     For Non-Qualified Contracts, in accordance with Code Section 72(u), a
deferred annuity contract held by a corporation or other entity that is not a
natural person is not treated as an annuity contract for tax purposes. Income on
the Contract is treated as ordinary income received by the Owner during the
taxable year. However, for purposes of Internal Revenue Code (the "Code")
Section 72(u), an annuity contract held by a trust or other entity as agent for
a natural person is considered held by a natural person and treated as an
annuity contract for tax purposes. Tax advice should be sought prior to
purchasing a Contract which is to be owned by a trust or other non-natural
person.
 
JOINT OWNERS
 
     The Contract can be owned by Joint Owners. If Joint Owners are named, any
Joint Owner must be the spouse of the other Owner. Upon the death of either
Owner, the surviving Joint Owner will be the primary Beneficiary. Any other
Beneficiary designation will be treated as a contingent Beneficiary unless
otherwise indicated in a Written Request. Unless otherwise specified, if there
are Joint Owners, both signatures will be required for all Owner transactions
except telephone transfers. If the telephone transfer option is elected and
there are Joint Owners, either Joint Owner can give telephone instructions.
 
ANNUITANT
 
     The Annuitant is the person on whose life Annuity Payments are based. The
Annuitant is the person designated by the Owner at the Issue Date, unless
changed prior to the Annuity Date. The Annuitant may not be changed in a
Contract which is owned by a non-natural person. Any change of Annuitant is
subject to the Company's underwriting rules then in effect.
 
                                       18
<PAGE>   24
 
ASSIGNMENT
 
     A Written Request specifying the terms of an assignment of the Contract
must be provided to the Annuity Service Office. Until a Written Request is
received, the Company will not be required to take notice of or be responsible
for any transfer of interest in the Contract by assignment, agreement, or
otherwise.
 
     The Company will not be responsible for the validity or tax consequences of
any assignment. Any assignment made after the death benefit has become payable
will be valid only with the Company's consent.
 
     If the Contract is assigned, the Owner's rights may only be exercised with
the consent of the assignee of record.
 
     If the Contract is issued pursuant to a retirement plan which receives
favorable tax treatment under the provisions of Sections 401, 403(b), 408, or
457 of the Code, it may not be assigned, pledged, or otherwise transferred
except as may be allowed under applicable law.
 
                      PURCHASE PAYMENTS AND CONTRACT VALUE
 
PURCHASE PAYMENTS
 
     The initial Purchase Payment is due on the Issue Date. The minimum initial
Purchase Payment for Non-Qualified Contracts is $5,000 and for Qualified
Contracts is $2,000 ($50 for Contracts issued in connection with Section 403(b)
plans). The minimum subsequent Purchase Payment for Non-Qualified Contracts is
$1,000, or if the automatic premium check option is elected, $50. The minimum
subsequent Purchase Payment for Qualified Contracts is $50. Subject to the
maximum and minimum Purchase Payments discussed herein, the Owner may make
subsequent Purchase Payments and may increase or decrease or change the
frequency of such payments. The maximum total Purchase Payments the Company will
accept without Company approval is $500,000 for issue Ages up to 75. The maximum
total Purchase Payments the Company will accept without Company approval for
issue Ages 75 and older is $250,000. The Company reserves the right to reject
any application or Purchase Payment.
 
     All Purchase Payments and sums payable to the Company under the Contract
are payable only at the Company's lock box at State Street Bank and Trust
Company at the following addresses: via mail: American General Annuity Insurance
Company, P.O. Box 5429, Boston, MA 02206-5429; via overnight delivery: State
Street Bank and Trust Company, Attn: Lock Box A3W, 1776 Heritage Drive, North
Quincy, MA 02171.
 
ALLOCATION OF PURCHASE PAYMENTS
 
     Purchase Payments are allocated to the General Account and/or the
Sub-Accounts of the Separate Account in accordance with the selection made by
the Owner. The allocation of the initial Purchase Payment is made in accordance
with the selection made by the Owner at the Issue Date. However, the Company
will, under certain circumstances, allocate initial Purchase Payments to the
State Street Global Advisors Money Market Sub-Account until the expiration of
the Right to Examine Contract period. (See "Highlights.") Unless otherwise
changed by the Owner, subsequent Purchase Payments are allocated in the same
manner as the initial Purchase Payment. Allocation of the Purchase Payments is
subject to the terms and conditions imposed by the Company. There are currently
no limitations on the number of Sub-Accounts that can be selected by an Owner.
Allocations must be in whole percentages.
 
     For initial Purchase Payments, if the forms required to issue the Contract
are in good order, the Company will apply the Purchase Payment to the Separate
Account and credit the Contract with Accumulation Units and/or to the General
Account and credit the Contract with dollars within two business days of
receipt.
 
     In addition to the underwriting requirements of the Company, good order
means that the Company has received federal funds (monies credited to a bank's
account with its regional Federal Reserve Bank). If the forms required to issue
a Contract are not in good order, the Company will attempt to get them in good
order or the Company will return the forms and the Purchase Payment within five
business days. The Company will not retain the Purchase Payment for more than
five business days while processing incomplete forms, unless it
                                       19
<PAGE>   25
 
has been so authorized by the purchaser. For subsequent Purchase Payments, the
Company will apply Purchase Payments to the Separate Account and credit the
Contract with Accumulation Units as of the end of the Valuation Period during
which the Purchase Payment was received in good order.
 
BONUS
 
     The Company will, at the time of the initial Purchase Payment and, as of
June 1, 1998, (subject to state regulatory approval) for certain subsequent
Purchase Payments, add an additional amount, as a Bonus, equal to 1% of such
Purchase Payment made under the Contract. The Bonus will be paid for subsequent
Purchase Payments of at least $5,000 for Non-Qualified Contracts or $2,000 for
Qualified Contracts. The Bonus will not be paid for subsequent Purchase Payments
made prior to June 1, 1998. The Bonus will not be paid for subsequent Purchase
Payments for Contracts issued in New Jersey. The Bonus will be allocated to the
Sub-Accounts of the Separate Account and/or the General Account in the same
manner as the Purchase Payment to which it is attributable. The Company reserves
the right to limit its payment of such Bonus to $5,000.
 
     If the Owner makes a withdrawal prior to the seventh Contract Year after
any applicable Purchase Payment that exceeds the Free Withdrawal Amount or is in
excess of the amount permitted under the Systematic Withdrawal Option, an amount
equal to the Bonus allocated to the Purchase Payments(s) withdrawn will be
deducted by the Company from the Contract Value. (This deduction is not
applicable in New Jersey.) The deduction will be pro rata from the Sub-Accounts
and/or the General Account in the proportion that the amount of Contract Value
in the Sub-Accounts and General Account bears to the total Contract Value. The
Company will not recapture any investment earnings on the Bonus. Investment
earnings are deemed to be withdrawn on a first-in, first-out basis. Owners do
not have a vested interest in the principal amount of a Bonus until seven
Contract Years from the date of the Bonus payment have elapsed; until that time,
the additional amount belongs to the Company.
 
     For purposes of distributions under the Contract, a Bonus payment and any
investment earnings thereon will be treated as taxable income and not as part of
the cost basis of the Contract. (See "Federal Tax Status -- General.")
 
DOLLAR COST AVERAGING
 
     Dollar Cost Averaging is a program which, if elected, permits an Owner to
systematically transfer amounts on a monthly, quarterly, semi-annual, or annual
basis from the State Street Global Advisors Money Market Sub-Account or the
General Account to one or more Sub-Accounts. By allocating amounts on a
regularly scheduled basis, as opposed to allocating the total amount at one
particular time, an Owner may be less susceptible to the effect of market
fluctuations. The minimum amount which may be transferred is $250 per transfer.
The amount may be specified as a percentage of Contract Values in the source
Sub-Account(s) (in whole percentages) or by dollar amount.
 
     If selected, Dollar Cost Averaging must be for at least 12 months. There is
no current charge for Dollar Cost Averaging. The standard date of the month for
transfers is the date the Owner's request for an enrollment in the program is
received and processed by the Company, and subsequent monthly, quarterly,
semi-annual, or annual anniversaries of that date. The Owner may specify a
different future date. If the Company imposes a transfer fee, transfers made
pursuant to the Dollar Cost Averaging program will not be taken into account in
determining any transfer fee.
 
CONTRACT VALUE
 
     The Contract Value is the sum of the Owner's interest in the General
Account and the Sub-Accounts of the Separate Account during the Accumulation
Period.
 
ACCUMULATION UNITS
 
     Accumulation Units will be used to account for all amounts allocated to or
withdrawn from the Sub-Accounts of the Separate Account as a result of Purchase
Payments, withdrawals, transfers, or fees and charges. The Company will
determine the number of Accumulation Units of a Sub-Account purchased or
 
                                       20
<PAGE>   26
 
canceled. This will be done by dividing the amount allocated to (or the amount
withdrawn from) the Sub-Account by the dollar value of one Accumulation Unit of
the Sub-Account as of the end of the Valuation Period during which the request
for the transaction is received at the Annuity Service Office.
 
ACCUMULATION UNIT VALUE
 
     The Accumulation Unit Value for each Sub-Account was arbitrarily set
initially at $10. The investment performance of the Investment Options, as well
as the deduction of the charges discussed in this Prospectus, affect
Accumulation Unit Values (see below). Subsequent Accumulation Unit Values for
each Sub-Account are determined by multiplying the Accumulation Unit Value for
the immediately preceding Valuation Period by the Net Investment Factor for the
Sub-Account for the current period.
 
     The Net Investment Factor for each Sub-Account is determined by dividing A
by B and subtracting C where:
 
     A is (i) the net asset value per share of the Investment Option or
          Portfolio of an Investment Option held by the Sub-Account for the
          current Valuation Period; plus
 
          (ii) any dividend per share declared on behalf of such Investment
          Option or Portfolio that has an ex-dividend date within the current
          Valuation Period; less
 
          (iii) the cumulative per share charge or credit for taxes reserved
          which is determined by the Company to have resulted from the operation
          or maintenance of the Sub-Account.
 
     B is the net asset value per share of the Investment Option or Portfolio of
          an Investment Option held by the Sub-Account for the immediately
          preceding Valuation Period, plus or minus the cumulative per share
          charge or credit for taxes reserved for the immediately preceding
          Valuation Date.
 
     C is the factor representing the cumulative per share unpaid charges for
          the Mortality and Expense Risk Charge, for the Administrative Charge,
          for the Enhanced Death Benefit Charge, if any and for the Annual
          Step-Up Death Benefit Charge, if any.
 
     The Accumulation Unit Value may increase or decrease from Valuation Period
to Valuation Period.
 
                                   TRANSFERS
 
TRANSFERS PRIOR TO THE ANNUITY DATE
 
     Subject to any limitations imposed by the Company on the number of
transfers that can be made during the Accumulation Period, the Owner may
transfer all or part of the Owner's Contract Value by Written Request without
the imposition of any fee or charge if there have been no more than the number
of free transfers. Currently, there are no restrictions on the number of
transfers that can be made each Contract Year. However, if the Company does
limit the number of transfers in the future, Owners are guaranteed four
transfers per year without a transfer fee during the Accumulation Period. All
transfers are subject to the following:
 
          1. Currently, the Company does not impose a transfer fee. The Company
     reserves the right to charge a fee for transfers in the future which will
     not exceed the lesser of $25 or 2% of the amount transferred (which will be
     deducted from the amount that is transferred). If more than the number of
     free transfers have been made in a Contract Year, the Company will deduct a
     transfer fee for each subsequent transfer permitted.
 
          2. The minimum amount which can be transferred is $250 (from (i) one
     or multiple Sub-Accounts or (ii) the General Account) or the Owner's entire
     interest in the Sub-Account or the General Account, if less. The minimum
     amount which must remain in a Sub-Account after a transfer is $500 per Sub-
     Account, or $0 if the entire amount in the Sub-Account is transferred. The
     minimum amount which must remain in the General Account after a transfer is
     $500, or $0 if the entire amount in the General Account is transferred.
 
                                       21
<PAGE>   27
 
          3. The maximum amount which can be transferred from the General
     Account to the Separate Account is 20% of the Owner's Contract Value in the
     General Account as of the last Contract Anniversary, except pursuant to a
     Dollar Cost Averaging Program. If the Sweep Account option has been
     elected, any funds transferred pursuant to that program will not be
     included in this limitation. (See "Sweep Account Program," below.)
 
          4. Transfers from any Sub-Account to the General Account may not be
     made for the six-month period following any transfer from the General
     Account into one or more of the Sub-Accounts.
 
          5. The Company reserves the right, at any time and without prior
     notice to any party, to terminate, suspend, or modify the transfer
     privilege described above.
 
     Owners can elect to make transfers by telephone. To do so, Owners must
complete a Written Request. The Company will use reasonable procedures to
confirm that instructions communicated by telephone are genuine. If it does not,
the Company may be liable for any losses due to unauthorized or fraudulent
instructions. The Company may tape record all telephone instructions. The
Company will not be liable for any loss, liability, cost, or expense incurred by
the Owner for acting in accordance with such telephone instructions believed to
be genuine. The telephone transfer privilege may be discontinued at any time by
the Company.
 
     If there are Joint Owners, unless the Company is informed to the contrary,
telephone instructions will be accepted from either of the Joint Owners.
 
     Neither the Separate Account nor the Investment Options are designed for
professional market timing organizations or other entities using programmed and
frequent transfers. A pattern of exchanges that coincides with a "market timing"
strategy may be disruptive to a Portfolio. The Company reserves the right to
restrict the transfer privilege or reject any specific Purchase Payment
allocation request for any person whose transactions seem to follow a timing
pattern. Although not contractually obligated to do so, the Company may, in its
sole discretion, provide prior or contemporaneous notice of restrictions on the
transfer privilege to Owners.
 
TRANSFERS DURING THE ANNUITY PERIOD
 
     During the Annuity Period, the Owner may make transfers by Written Request,
as follows:
 
          1. The Owner may make transfers of Contract Values between
     Sub-Accounts, subject to any limitations imposed by the Company on the
     number of transfers that can be made during the Annuity Period. Currently,
     there are no restrictions on the number of transfers that can be made.
     However, if the Company does limit the number of transfers in the future,
     Owners are guaranteed four transfers per year free of any transfer fee
     during the Annuity Period. Currently, the Company does not impose a
     transfer fee. The Company reserves the right to charge a fee for transfers
     in the future which will not exceed the lesser of $25 or 2% of the amount
     transferred (which will be deducted from the amount which is transferred).
 
          2. The Owner may, once each Contract Year, make a transfer from one or
     more Sub-Accounts to the General Account. The Owner may not make a transfer
     from the General Account to the Separate Account.
 
          3. Transfers between Sub-Accounts will be made by converting the
     number of Annuity Units being transferred to the number of Annuity Units of
     the Sub-Account to which the transfer is made, so that the next Annuity
     Payment, if it were made at that time, would be the same amount that it
     would have been without the transfer. Thereafter, Annuity Payments will
     reflect changes in the value of the new Annuity Units.
 
          The amount transferred to the General Account from a Sub-Account will
     be based on the annuity reserves for the Owner in that Sub-Account.
     Transfers to the General Account will be made by converting the Annuity
     Units being transferred to purchase fixed Annuity Payments under the
     Annuity Option in effect and based on the Age of the Annuitant at the time
     of the transfer.
 
                                       22
<PAGE>   28
 
          4. The minimum amount which can be transferred is $250 from one or
     multiple Sub-Accounts, or the Owner's entire interest in the Sub-Account,
     if less. The minimum amount which must remain in a Sub-Account after a
     transfer is $500 per Sub-Account, or $0 if the entire amount in the
     Sub-Account is transferred.
 
          5. The Company reserves the right, at any time and without prior
     notice to any party, to terminate, suspend, or modify the transfer
     privilege described above.
 
     Owners can elect to make transfers by telephone. To do so, Owners must
complete a Written Request. The Company will use reasonable procedures to
confirm that instructions communicated by telephone are genuine. If it does not,
the Company may be liable for any losses due to unauthorized or fraudulent
instructions. The Company may tape record all telephone instructions. The
Company will not be liable for any loss, liability, cost, or expense incurred by
the Owner for acting in accordance with such telephone instructions believed to
be genuine. The telephone transfer privilege may be discontinued at any time by
the Company.
 
     If there are Joint Owners, unless the Company is informed to the contrary,
telephone instructions will be accepted from either of the Joint Owners.
 
SWEEP ACCOUNT PROGRAM
 
     During the Accumulation Period, an Owner may elect to participate in the
Sweep Account Program which permits the Owner to transfer ("sweep") the income
from the General Account to the Sub-Accounts, on a quarterly basis, as long as
the General Account balance is at least $25,000. The transfer will be made on
quarterly anniversaries of the Issue Date of the Contract unless the Owner
specifies a different date.
 
                           ASSET ALLOCATION PROGRAMS
 
ASSET ALLOCATION -- PORTFOLIO REBALANCING
 
     From time to time, the Company may make available a program (Portfolio
Rebalancing) which provides for periodic pre-authorized automatic transfers
among the Sub-Accounts pursuant to written allocation instructions from the
Owner. Such transfers are made to maintain a particular percentage allocation
among the Portfolios as selected by the Owner. The minimum allocation is 1% per
selection.
 
     An Owner may elect that rebalancing occur on a monthly, quarterly,
semi-annual, or annual basis, and currently, all Portfolios are available
investment options under the Program. The General Account is not an available
investment option under the Program.
 
ASSET ALLOCATION -- FINANCIAL INTERMEDIARIES
 
     In addition, the Company may make available another Asset Allocation
program whereby certain financial intermediaries will make their services
available to Owners to provide advice for the selection of the Sub-Accounts and
the General Account under the Contracts. The Company has recognized the value to
Owners of having available (on a continuous basis) advice for the selection of
the Sub-Accounts and the General Account. An Owner participating in such a
program authorizes the financial intermediary to make transfers of his or her
Contract Values among the Sub-Accounts and/or the General Account. The Company
has not, and will not, make any independent investigation of such financial
intermediaries, their services, or the costs, if any, for such services. The
financial intermediaries will be required to comply with the Company's
administrative systems and rules, including the prohibition against market
timers. A Written Request will be required to participate in such Asset
Allocation programs.
 
     An Owner may enter into an advisory agreement with such financial
intermediaries. If such an agreement is entered into, an Owner will need to
complete certain administrative forms. Compensation, if any, for the services of
the financial intermediaries is a matter between the intermediaries and the
Owners.
 
                                       23
<PAGE>   29
 
     The selection of financial intermediaries or other advisers is solely the
responsibility of the Owner. Any compensation due any financial intermediary or
other adviser, as a result of investment advice he or she may have rendered an
Owner in connection with the Contracts, is solely the Owner's responsibility.
The Company has not made any independent investigation of the financial
intermediaries offering any asset allocation programs or of the programs they
offer. The Company does not endorse the financial intermediaries offering "Asset
Allocation Programs."
 
     The above Asset Allocation programs are only available during the
Accumulation Period. Currently, there is no minimum Contract Value required for
participants in such a program. However, the Company reserves the right to
require a minimum Contract Value for Asset Allocation programs. The Company does
not currently charge for enrollment in the programs, but reserves the right to
do so. Owners can terminate their participation in any program by Written
Request. If the Company imposes a transfer fee, transfers made pursuant to an
Asset Allocation program will not be taken into account in determining any
transfer fee. The Company reserves the right to modify, suspend, or terminate
either of the Asset Allocation programs at any time.
 
                                  WITHDRAWALS
 
     During the Accumulation Period, the Owner may, upon a Written Request, make
a total or partial withdrawal of the Contract Withdrawal Value. The Contract
Withdrawal Value is:
 
          1. The Contract Value as of the end of the Valuation Period during
     which a Written Request for a withdrawal is received; less
 
          2. Any applicable taxes not previously deducted; less
 
          3. Any applicable Contingent Deferred Sales Charge; less
 
          4. The Contract Maintenance Charge, if any.
 
     A withdrawal will result in the cancellation of Accumulation Units from
each applicable Sub-Account or a reduction in the Owner's General Account
Contract Value in the ratio that the Owner's interest in the Sub-Account and/or
General Account bears to the total Contract Value. The Owner must specify by
Written Request in advance which Sub-Account Units are to be canceled, if other
than the above method is desired.
 
     The Company will pay the amount of any withdrawal from the Separate Account
within seven days of receipt of a request in good order unless the Suspension or
Deferral of Payments provision is in effect.
 
     Each partial withdrawal must be for at least $500. The minimum Contract
Value which must remain in the Contract after a partial withdrawal is $5,000 for
Non-Qualified Contracts and $2,000 for Qualified Contracts.
 
     Certain tax withdrawal penalties and restrictions may apply to withdrawals
from the Contracts. (See "Federal Tax Status.") For Contracts purchased in
connection with 403(b) plans, the Code limits the withdrawal of amounts
attributable to contributions made pursuant to a salary reduction agreement (as
defined in Section 403(b)(11) of the Code) to circumstances only when the Owner:
(a) attains age 59 1/2; (b) separates from service; (c) dies; (d) becomes
disabled (within the meaning of Section 72(m)(7) of the Code); or (e) incurs a
qualifying hardship. However, withdrawals for hardship are restricted to the
portion of the Owner's Contract Value which represents contributions made by the
Owner and does not include any investment results. The limitations on
withdrawals became effective on January 1, 1989, and apply only to salary
reduction contributions made after December 31, 1988, to income attributable to
such contributions and to income attributable to amounts held as of December 31,
1988. The limitations on withdrawals do not affect rollovers or transfers
between certain Qualified Plans. Owners should consult their own tax counsel or
other tax adviser regarding any distributions.
 
                                       24
<PAGE>   30
 
SYSTEMATIC WITHDRAWAL OPTION
 
     The Company offers a systematic withdrawal option which enables an Owner to
pre-authorize a periodic exercise of the contractual withdrawal rights described
above. The total permitted systematic withdrawals in a Contract Year are limited
to not more than 10% of the Contract Value as of the immediately preceding
Contract Anniversary or, if during the first Contract Year, the Issue Date. The
systematic withdrawal option can be exercised at any time including during the
first Contract Year. The exercise of the systematic withdrawal option in any
Contract Year replaces the Free Withdrawal Amount which is allowable once per
Contract Year after the first Contract Anniversary without incurring a
Contingent Deferred Sales Charge.
 
     Systematic withdrawals for Non-Qualified Contracts where the Owner is under
age 59 1/2 may be subject to income tax and certain tax penalties. Other
restrictions may also apply to systematic withdrawals from the Contracts. (See
"Federal Tax Status -- Tax Treatment of Withdrawals -- Qualified Contracts" and
"Tax Treatment of Withdrawals -- Non-Qualified Contracts.") Owners entering into
such a program instruct the Company to withdraw an amount specified as a
percentage of Contract Value, or in dollars on a monthly, quarterly, or
semi-annual basis. The minimum withdrawal amount is $100 per payment. The
standard date of the month for withdrawals is the date the Owner's request for
enrollment in the program is received and processed by the Company, and
subsequent monthly (or the payment schedule selected) anniversaries of that
date. The Owner may specify a different future date.
 
TEXAS OPTIONAL RETIREMENT PROGRAM
 
     A Contract issued to a participant in the Texas Optional Retirement Program
("ORP") will contain an ORP endorsement that will amend the Contract as follows:
(a) if for any reason a second year of ORP participation is not begun, the total
amount of the State of Texas' first-year contribution will be returned to the
appropriate institution of higher education upon its request and (b) no benefits
will be payable, through surrender of the Contract or otherwise, until the
participant dies, accepts retirement, terminates employment in all Texas
institutions of higher education, or attains the age of 70 1/2. The value of the
Contract may, however, be transferred to other contracts or carriers during the
period of ORP participation. A participant in the ORP is required to obtain a
certificate of termination from the participant's employer before the value of a
Contract can be withdrawn.
 
SUSPENSION OR DEFERRAL OF PAYMENTS
 
     The Company reserves the right to suspend or postpone payments for a
withdrawal or transfer for any period when:
 
          1. The New York Stock Exchange (the "NYSE") is closed (other than
     customary weekend and holiday closings);
 
          2. Trading on the NYSE is restricted;
 
          3. An emergency exists as a result of which disposal of securities
     held in the Separate Account is not reasonably practicable or it is not
     reasonably practicable to determine the value of the Separate Account's net
     assets; or
 
          4. During any other period when the SEC, by order, so permits for the
     protection of Owners; provided that applicable rules and regulations of the
     SEC will govern as to whether the conditions described in (2) and (3)
     exist.
 
     The Company reserves the right to defer payment for a withdrawal or
transfer from the General Account for the period permitted by law, but not for
more than six months after written election is received by the Company.
 
                                       25
<PAGE>   31
 
                           PROCEEDS PAYABLE ON DEATH
 
DEATH OF OWNER DURING THE ACCUMULATION PERIOD
 
     Upon the death of the Owner or Joint Owner during the Accumulation Period,
the death benefit will be paid to the Beneficiary(ies) designated by the Owner.
Upon the death of a Joint Owner, the surviving Joint Owner, if any, will be
treated as the primary Beneficiary. Any other Beneficiary designation on record
at the time of death will be treated as a contingent Beneficiary.
 
     A Beneficiary may request that the death benefit be paid under one of the
Death Benefit Options below. If the Beneficiary is the spouse of the Owner, he
or she may elect to continue the Contract at the then-current Contract Value in
his or her own name and exercise all the Owner's rights under the Contract.
 
DEATH BENEFIT AMOUNT DURING THE ACCUMULATION PERIOD (STANDARD DEATH BENEFIT)
 
     For a death occurring prior to the 80th birthday of the Owner, or the
oldest Joint Owner, the death benefit during the Accumulation Period will be the
greatest of:
 
          1. The Purchase Payments, less any withdrawals, including any
     previously deducted Contingent Deferred Sales Charge; or
 
          2. The Contract Value determined as of the end of the Valuation Period
     during which the Company receives, at its Annuity Service Office, both due
     proof of death and an election of the payment method; or
 
          3. The highest Step-up Value prior to the date of death. The Step-up
     Value is equal to the Contract Value on each seventh Contract Anniversary,
     plus any Purchase Payments made after such Contract Anniversary, less any
     withdrawals and Contingent Deferred Sales Charge deducted after such
     Contract Anniversary.
 
     For a death occurring on or after the 80th birthday of the Owner, or the
oldest Joint Owner, the death benefit during the Accumulation Period will be the
Contract Value determined as of the end of the Valuation Period during which the
Company receives, at its Annuity Service Office, both due proof of death and an
election of the payment method.
 
ENHANCED DEATH BENEFIT AMOUNT DURING THE ACCUMULATION PERIOD
 
     If the Owner selects the Enhanced Death Benefit, for a death occurring
prior to the 75th birthday of the Owner, or the oldest Joint Owner, the death
benefit will be the greatest of:
 
          1. The Purchase Payments, less any withdrawals and previously deducted
     Contingent Deferred Sales Charge; or
 
          2. The Contract Value determined as of the end of the Valuation Period
     during which the Company receives, at its Annuity Service Office, both due
     proof of death and an election of the payment method; or
 
          3. The highest Step-up Value prior to the date of death. The Step-up
     Value is equal to the Contract Value on each seventh Contract Anniversary,
     plus any Purchase Payments made after such Contract Anniversary, less any
     withdrawals and Contingent Deferred Sales Charge deducted after such
     Contract Anniversary; or
 
          4. The total amount of Purchase Payments compounded up to the date of
     death at 3% interest, minus the total withdrawals and previously deducted
     Contingent Deferred Sales Charges compounded up to the date of death at 3%
     interest, not to exceed 200% of Purchase Payments, less withdrawals and
     previously deducted Contingent Deferred Sales Charges.
 
     For a death occurring on or after the 75th birthday and before the 80th
birthday of the Owner, or the oldest Joint Owner, the death benefit during the
Accumulation Period will be the greatest of 1, 2, or 3 above.
 
                                       26
<PAGE>   32
 
     For death occurring on or after the 80th birthday of the Owner, or the
oldest Joint Owner, the death benefit during the Accumulation Period will be the
Contract Value determined as of the Valuation Period during which the Company
receives at its Annuity Service Office both due proof of death and an election
of the payment method.
 
ANNUAL STEP-UP DEATH BENEFIT AMOUNT DURING THE ACCUMULATION PERIOD
 
     For Contracts issued on or after June 1, 1998, an Owner may select the
Annual Step-Up Death Benefit. If the Owner selects the Annual Step-Up Death
Benefit, for a death occurring prior to the 75th birthday of the Owner, or the
oldest Joint Owner, the death benefit amount during the Accumulation Period will
be the greatest of:
 
          1. The Purchase Payments, less any withdrawals and previously deducted
     Contingent Deferred Sales Charge; or
 
          2. The Contract Value determined as of the end of the Valuation Period
     during which the Company receives at its Annuity Service Office both due
     proof of death and an election of the payment method; or
 
          3. The highest Step-Up Value prior to the date of death. The Step-Up
     Value is equal to the Contract Value on any Contract Anniversary plus any
     Purchase Payments made after such Contract Anniversary less any withdrawals
     and Contingent Deferred Sales Charge deducted after such Contract
     Anniversary.
 
     For a death occurring on or after the 75th birthday of the Owner, or the
oldest Joint Owner, the death benefit during the Accumulation Period will be the
standard death benefit described above.
 
     In certain states, the Annual Step-Up Death Benefit may not be available.
(Check with your registered representative regarding availability.) Owners
should refer to their Contract and any endorsement for the applicable death
benefit provision.
 
DEATH BENEFIT OPTIONS DURING THE ACCUMULATION PERIOD
 
     A non-spousal Beneficiary must elect the death benefit to be paid under one
of the following options in the event of the death of the Owner during the
Accumulation Period:
 
     Option 1 -- lump sum payment of the death benefit; or
 
     Option 2 -- payment of the entire death benefit within five years of the
                 date of the death of the Owner; or
 
     Option 3 -- payment of the death benefit under an Annuity Option over the
                 lifetime of the Beneficiary or over a period not extending
                 beyond the life expectancy of the Beneficiary, with
                 distribution beginning within one year of the date of death of
                 the Owner or any Joint Owner.
 
     Any portion of the death benefit not applied under Option 3, within one
year of the date of the Owner's death, must be distributed within five years of
the date of death.
 
     A spousal Beneficiary may elect to continue the Contract in his or her own
name at the then-current Contract Value, elect a lump sum payment of the death
benefit, or apply the death benefit to an Annuity Option.
 
     If a lump sum payment is requested, the amount will be paid within seven
days of receipt of proof of death and the election, unless the Suspension or
Deferral of Payments provision is in effect.
 
     Payment to the Beneficiary, other than in a lump sum, may only be elected
during the 60-day period beginning with the date of receipt of proof of death.
 
                                       27
<PAGE>   33
 
DEATH OF OWNER DURING THE ANNUITY PERIOD
 
     If the Owner or a Joint Owner, who is not the Annuitant, dies during the
Annuity Period, any remaining payments under the Annuity Option elected will
continue at least as rapidly as under the method of distribution in effect at
such Owner's death. Upon the death of the Owner during the Annuity Period, the
Beneficiary becomes the Owner.
 
DEATH OF ANNUITANT
 
     Upon the death of the Annuitant, who is not the Owner, during the
Accumulation Period, the Owner may designate a new Annuitant, subject to the
Company's underwriting rules then in effect. If no designation is made within 30
days of the death of the Annuitant, the Owner will become the Annuitant. If the
Owner is a non-natural person, the death of the Annuitant will be treated as the
death of the Owner and a new Annuitant may not be designated.
 
     Upon the death of the Annuitant during the Annuity Period, the death
benefit, if any, will be as specified in the Annuity Option elected. Death
benefits will be paid at least as rapidly as under the method of distribution in
effect at the Annuitant's death.
 
PAYMENT OF DEATH BENEFIT
 
     The Company will require due proof of death before any death benefit is
paid. Due proof of death will be:
 
          1. A certified death certificate;
 
          2. A certified decree of a court of competent jurisdiction as to the
     finding of death; or
 
          3. Any other proof satisfactory to the Company.
 
     All death benefits will be paid in accordance with applicable law or
regulations governing death benefit payments.
 
BENEFICIARY
 
     The Beneficiary designation in effect on the Issue Date will remain in
effect until changed. The Beneficiary is entitled to receive the benefits to be
paid at the death of the Owner. Unless the Owner provides otherwise, the death
benefit will be paid in equal shares to the survivor(s) as follows:
 
          1. To the primary Beneficiary(ies) who survive the Owner's and/or the
     Annuitant's death, as applicable; or if there are none,
 
          2. To the contingent Beneficiary(ies) who survive the Owner's and/or
     the Annuitant's death, as applicable; or if there are none,
 
          3. To the estate of the Owner.
 
CHANGE OF BENEFICIARY
 
     Subject to the rights of any irrevocable Beneficiary(ies), the Owner may
change the primary Beneficiary(ies) or contingent Beneficiary(ies). Any change
must be made by Written Request. The change will take effect as of the date the
Written Request is signed. The Company will not be liable for any payment made
or action taken before it records the change.
 
                                       28
<PAGE>   34
 
                               ANNUITY PROVISIONS
 
GENERAL
 
     On the Annuity Date, the Adjusted Contract Value will be applied under the
Annuity Option selected by the Owner. Annuity Payments may be made on a fixed or
variable basis, or both.
 
ANNUITY DATE
 
     The Annuity Date is selected by the Owner on the Issue Date. The Annuity
Date must be the first day of a calendar month and must be at least five years
after the Issue Date. The Annuity Date may not be later than that required under
state law.
 
     Prior to the Annuity Date, the Owner, subject to the above, may change the
Annuity Date by Written Request. Any change must be requested at least 15 days
prior to the new Annuity Date.
 
SELECTION OR CHANGE OF AN ANNUITY OPTION
 
     An Annuity Option is selected by the Owner at the time the Contract is
issued. If no Annuity Option is selected, Option B, with 120 monthly payments
guaranteed, will automatically be applied. Prior to the Annuity Date, the Owner
can change the Annuity Option selected by Written Request. Any change must be
requested at least 15 days prior to the Annuity Date.
 
FREQUENCY AND AMOUNT OF ANNUITY PAYMENTS
 
     Annuity Payments are paid in monthly, quarterly, semi-annual, or annual
installments. The Adjusted Contract Value is applied to the Annuity Table for
the Annuity Option selected. If the Adjusted Contract Value to be applied under
an Annuity Option is less than $2,000, the Company reserves the right to make a
lump sum payment in lieu of Annuity Payments. If the Annuity Payment would be or
become less than $200 where only a Fixed Annuity or a Variable Annuity is
selected, or if the Annuity Payment would be or become less than $100 on each
basis when a combination of Fixed and Variable Annuities is selected, the
Company will reduce the frequency of payments to an interval which will result
in each payment being at least $200, or $100 on each basis if a combination of
Fixed and Variable Annuities is selected.
 
ANNUITY
 
     If the Owner selects a Fixed Annuity, the Adjusted Contract Value is
allocated to the General Account and the Annuity is paid as a Fixed Annuity. If
the Owner selects a Variable Annuity, the Adjusted Contract Value will be
allocated to the Sub-Account(s) of the Separate Account in accordance with the
selection made by the Owner, and the Annuity will be paid as a Variable Annuity.
The Owner can also select a combination of a Fixed and Variable Annuity and the
Adjusted Contract Value will be allocated accordingly. Unless the Owner
specifies otherwise, the payee of the Annuity Payments shall be the Annuitant
and any Joint Annuitant.
 
     The Adjusted Contract Value will be applied to the applicable Annuity Table
contained in the Contract based upon the Annuity Option selected by the Owner.
 
FIXED ANNUITY
 
     The Owner may elect to have the Adjusted Contract Value applied to provide
a Fixed Annuity. The dollar amount of each Fixed Annuity payment will be
determined in accordance with Annuity Tables contained in the Contract, which
are based on the minimum guaranteed interest rate of 3% per year. After the
initial Fixed Annuity payment, the payments will not change regardless of
investment, mortality, or expense experience.
 
                                       29
<PAGE>   35
 
VARIABLE ANNUITY
 
     Variable Annuity payments reflect the investment performance of the
Separate Account in accordance with the allocation of the Adjusted Contract
Value to the Sub-Accounts during the Annuity Period. Variable Annuity payments
are not guaranteed as to dollar amount. See the SAI regarding how Annuity
Payments and Annuity Units are calculated.
 
ANNUITY OPTIONS
 
     The following Annuity Options or any other Annuity Option acceptable to the
Company may be selected:
 
          Option A (Life Annuity) -- Monthly Annuity Payments during the life of
     the Annuitant.
 
          Option B (Life Annuity with Periods Certain of 60, 120, 180, or 240
     Months) -- Monthly Annuity Payments during the lifetime of the Annuitant
     and in any event for 60, 120, 180, or 240 months certain as selected.
 
          Option C (Joint and Survivor Annuity) -- Monthly Annuity Payments
     payable during the joint lifetime of the Annuitant and a Joint Annuitant
     and then during the lifetime of the survivor at the percentage (100%, 75%,
     66 2/3%, or 50%) selected.
 
     Annuity Options A, B, and C are available on a Fixed Annuity basis, a
Variable Annuity basis, or a combination of both. Election of a Fixed Annuity or
a Variable Annuity must be made no later than 15 days prior to the Annuity Date.
If no election is made with respect to whether the Annuity Option will be on a
Fixed Annuity basis, Variable Annuity basis, or a combination of both, the
Annuity Option will be paid to reflect the allocation of the Contract Value on
the Annuity Date between the Separate Account and the General Account, if any.
 
                                  DISTRIBUTOR
 
     AGA Brokerage Services, Inc. (formerly, WNL Brokerage Services, Inc.) ("AGA
Brokerage"), 2929 Allen Parkway, Houston, Texas 77019, is the distributor and
underwriter of the Contracts. AGA Brokerage is registered as a broker-dealer
with the SEC and is a member of the National Association of Securities Dealers,
Inc. AGA Brokerage and the Company are owned by the same corporation.
 
     Commissions will be paid to broker-dealers who sell the Contracts.
Broker-dealers will be paid commissions, up to an amount currently equal to 7%
of Purchase Payments, for promotional or distribution expenses associated with
the marketing of the Contracts. Under certain circumstances the Company, in its
sole discretion, may increase the commissions paid up to an amount equal to 10%
of Purchase Payments.
 
                        ADMINISTRATION OF THE CONTRACTS
 
     While the Company has primary responsibility for all administration of the
Contracts, it has retained the services of Financial Administrative Services,
Inc. ("FAS"), pursuant to an Insurance Service Agreement. Such administrative
services include issuance of the Contracts and maintenance of Owners' records,
for the Contracts issued prior to June 1, 1998. FAS serves as the administrator
to various insurance companies. The Company has assumed responsibility for
administration of all Contracts issued on or after June 1, 1998. The Company
intends to take over administration of the Contracts issued prior to June 1,
1998 in November, 1998.
 
                                       30
<PAGE>   36
 
                            PERFORMANCE INFORMATION
 
MONEY MARKET SUB-ACCOUNT
 
     From time to time, the Company may advertise the "yield" and "effective
yield" of the State Street Global Advisors Money Market Sub-Account ("Money
Market Sub-Account") of the Separate Account. Both yield figures are based on
historical earnings and are not intended to indicate future performance. The
"yield" of the Money Market Sub-Account refers to the income generated by
Contract Values in the Money Market Sub-Account over a seven-day period (which
period will be stated in the advertisement). This income is "annualized." That
is, the amount of income generated by the investment during that week is assumed
to be generated each week over a 52-week period and is shown as a percentage of
the Contract Value in the Money Market Sub-Account. The "effective yield" is
calculated similarly. However, when annualized, the income earned by Contract
Value is assumed to be reinvested. This results in the "effective yield" being
slightly higher than the "yield" because of the compounding effect of the
assumed reinvestment. The yield figure will reflect the deduction of any
asset-based charges and any applicable Contract Maintenance Charge.
 
OTHER SUB-ACCOUNTS
 
     From time to time, the Company may advertise performance data for the
various other Sub-Accounts under the Contract. Such data will show the
percentage change in the value of an Accumulation Unit based on the performance
of an Investment Option over a period of time, usually a calendar year,
determined by dividing the increase (decrease) in value for that Unit by the
Accumulation Unit value at the beginning of the period. This percentage figure
will reflect the deduction of any asset-based charges and any applicable
Contract Maintenance Charge under the Contracts. It will not reflect the
deduction of the Contingent Deferred Sales Charge, which if applied would reduce
any percentage increase or make greater any percentage decrease.
 
     Any advertisement will also include average annual total return figures
calculated as described in the SAI. The total return figures reflect the
deduction of all charges and deductions under the Contracts and the fees and
expenses of the Portfolios. The Company may also advertise performance
information computed on a different basis.
 
     The Company may make available yield information with respect to some of
the Sub-Accounts. Such yield information will be calculated as described in the
SAI. The yield information will reflect the deduction of all charges and
deductions under the Contracts and the fees and expenses of the Portfolios.
 
     The Company may also show historical Accumulation Unit values in certain
advertisements containing illustrations. These illustrations will be based on
actual Accumulation Unit values.
 
     In addition, the Company may distribute sales literature which compares the
percentage change in Accumulation Unit values for any of the Sub-Accounts
against established market indexes such as the Standard & Poor's 500 Composite
Stock Price Index, the Dow Jones Industrial Average, or other management
investment companies which have investment objectives similar to the underlying
Portfolio being compared. The Standard & Poor's 500 Composite Stock Price Index
is an unmanaged, unweighted average of 500 stocks, the majority of which are
listed on the NYSE. The Dow Jones Industrial Average is an unmanaged, weighted
average of 30 blue chip industrial corporations listed on the NYSE. Both the
Standard & Poor's 500 Composite Stock Price Index and the Dow Jones Industrial
Average assume quarterly reinvestment of dividends.
 
     In addition, the Company may, as appropriate, compare each Sub-Account's
performance to that of other types of investments such as certificates of
deposit, savings accounts, and U.S. Treasuries, or to certain interest rate and
inflation indexes, such as the Consumer Price Index, which is published by the
U.S. Department of Labor and measures the average change in prices over time of
a fixed "market basket" of certain specified goods and services. Similar
comparisons of Sub-Account performance may also be made with appropriate indexes
measuring the performance of a defined group of securities widely recognized by
investors as representing a particular segment of the securities markets. For
example, Sub-Account performance may be
 
                                       31
<PAGE>   37
 
compared with Donoghue Money Market Institutional Averages (money market rates),
Lehman Brothers Corporate Bond Index (corporate bond interest rates), or Lehman
Brothers Government Bond Index (long-term U.S. government obligation interest
rates).
 
     The Company may also distribute sales literature which compares the
performance of the Accumulation Unit values of the Contracts issued through the
Separate Account with the unit values of variable annuities issued through the
separate accounts of other insurance companies. Such information will be derived
from the Lipper Variable Insurance Products Performance Analysis Service, the
VARDS Report, or from Morningstar.
 
     The Lipper Variable Insurance Products Performance Analysis Service is
published by Lipper Analytical Services, Inc., a publisher of statistical data
which currently tracks the performance of over 8,400 investment companies. The
rankings compiled by Lipper may or may not reflect the deduction of asset-based
insurance charges. The Company's sales literature utilizing these rankings will
indicate whether or not such charges have been deducted. Where the charges have
not been deducted, the sales literature will indicate that if the charges had
been deducted, the ranking might have been lower.
 
     The VARDS Report is a monthly variable annuity industry analysis compiled
by Variable Annuity Research & Data Service and published by Financial Planning
Resources, Inc. The VARDS Report rankings may or may not reflect the deduction
of asset-based insurance charges. Where the charges have not been deducted, the
sales literature will indicate that if the charges had been deducted, the
rankings might have been lower.
 
     Morningstar rates a variable annuity sub-account against its peers with
similar investment objectives. Morningstar does not rate any sub-account that
has less than three years of performance data. The Morningstar rankings may or
may not reflect the deduction of charges. Where the charges have not been
deducted, the sales literature will indicate that if the charges had been
deducted, the rankings might have been lower.
 
                               FEDERAL TAX STATUS
 
GENERAL
 
NOTE: THE FOLLOWING DESCRIPTION IS BASED UPON THE COMPANY'S UNDERSTANDING OF
      CURRENT FEDERAL INCOME TAX LAW APPLICABLE TO ANNUITIES IN GENERAL. THE
      COMPANY CANNOT PREDICT THE PROBABILITY THAT ANY CHANGES IN SUCH LAWS WILL
      BE MADE. PURCHASERS ARE CAUTIONED TO SEEK COMPETENT TAX ADVICE REGARDING
      THE POSSIBILITY OF SUCH CHANGES. THE COMPANY DOES NOT GUARANTEE THE TAX
      STATUS OF THE CONTRACTS. PURCHASERS BEAR THE COMPLETE RISK THAT THE
      CONTRACTS MAY NOT BE TREATED AS "ANNUITY CONTRACTS" UNDER FEDERAL INCOME
      TAX LAWS. IT SHOULD BE FURTHER UNDERSTOOD THAT THE FOLLOWING DISCUSSION IS
      NOT EXHAUSTIVE AND THAT SPECIAL RULES NOT DESCRIBED IN THIS PROSPECTUS MAY
      BE APPLICABLE IN CERTAIN SITUATIONS. MOREOVER, NO ATTEMPT HAS BEEN MADE TO
      CONSIDER ANY APPLICABLE STATE OR OTHER TAX LAWS.
 
     Section 72 of the Code governs taxation of annuities in general. An Owner
is not taxed on increases in the value of a Contract until distribution occurs,
either in the form of a lump sum payment or as Annuity Payments under the
Annuity Option selected. For a lump sum payment received as a total withdrawal
(total surrender), the recipient is taxed on the portion of the payment that
exceeds the cost basis of the Contract. For Non-Qualified Contracts, this cost
basis is generally the Purchase Payments, while for Qualified Contracts there
may be no cost basis. The taxable portion of the lump sum payment is taxed at
ordinary income tax rates.
 
     For annuity payments, a portion of each payment in excess of an exclusion
amount is includible in taxable income. The exclusion amount for payments based
on a Fixed Annuity Option is determined by multiplying the payment by the ratio
that the cost basis of the Contract (adjusted for any period certain or refund
feature) bears to the expected return under the Contract. The exclusion amount
for payments based on a Variable Annuity Option is determined by dividing the
cost basis of the Contract (adjusted for any period certain or refund guarantee)
by the number of years over which the annuity is expected to be paid. Payments
received
 
                                       32
<PAGE>   38
 
after the investment in the Contract has been recovered (i.e., when the total of
the excludible amounts equals the investment in the Contract) are fully taxable.
The taxable portion is taxed at ordinary income tax rates. For certain types of
Qualified Plans, there may be no cost basis in the Contract within the meaning
of Section 72 of the Code. Owners, Annuitants, and Beneficiaries under the
Contracts should seek competent financial advice about the tax consequences of
any distributions.
 
     The Company is taxed as a life insurance company under the Code. For
federal income tax purposes, the Separate Account is not a separate entity from
the Company, and its operations form a part of the Company.
 
DIVERSIFICATION
 
     Section 817(h) of the Code imposes certain diversification standards on the
underlying assets of variable annuity contracts. The Code provides that a
variable annuity contract will not be treated as an annuity contract for any
period (and any subsequent period) for which the investments are not, in
accordance with regulations prescribed by the U.S. Treasury Department
("Treasury Department"), adequately diversified. Disqualification of the
Contract as an annuity contract would result in imposition of federal income tax
to the Owner with respect to earnings allocable to the Contract prior to the
receipt of payments under the Contract. The Code contains a safe harbor
provision which provides that annuity contracts such as the Contracts meet the
diversification requirements if, as of the end of each quarter, the underlying
assets meet the diversification standards for a regulated investment company,
and no more than 55% of the total assets consist of cash, cash items, U.S.
government securities, and securities of other regulated investment companies.
 
     On March 2, 1989, the Treasury Department issued Regulations (Treas. Reg.
1.817-5), which established diversification requirements for the investment
portfolios underlying variable contracts such as the Contracts. The Regulations
amplify the diversification requirements for variable contracts set forth in the
Code and provide an alternative to the safe harbor provision described above.
Under the Regulations, an investment portfolio will be deemed adequately
diversified if: (a) no more than 55% of the value of the total assets of the
portfolio is represented by any one investment; (b) no more than 70% of the
value of the total assets of the portfolio is represented by any two
investments; (c) no more than 80% of the value of the total assets of the
portfolio is represented by any three investments; and (d) no more than 90% of
the value of the total assets of the portfolio is represented by any four
investments.
 
     The Code provides that, for purposes of determining whether or not the
diversification standards imposed on the underlying assets of variable contracts
by Section 817(h) of the Code have been met, "each United States government
agency or instrumentality shall be treated as a separate issuer."
 
     The Company intends that all Portfolios of the Investment Options
underlying the Contracts will be managed by the Advisers for the Investment
Options in such a manner as to comply with these diversification requirements.
 
     The Treasury Department has indicated that the diversification Regulations
do not provide guidance regarding the circumstances in which Owner control of
the investments of the Separate Account will cause the Owner to be treated as
the owner of the assets of the Separate Account, thereby resulting in the loss
of favorable tax treatment for the Contract. At this time, it cannot be
determined whether additional guidance will be provided and what standards may
be contained in such guidance.
 
     The amount of Owner control which may be exercised under the Contract is
different, in some respects, from the situations addressed in published rulings
issued by the Internal Revenue Service in which it was held that the policy
owner was not the owner of the assets of the Separate Account. It is unknown
whether these differences, such as the Owner's ability to transfer among
investment choices or the number and type of investment choices available, would
cause the Owner to be considered as the owner of the assets of the Separate
Account, resulting in the imposition of federal income tax to the Owner with
respect to earnings allocable to the Contract, prior to receipt of payments
under the Contract.
 
     In the event any forthcoming guidance or ruling is considered to set forth
a new position, such guidance or ruling will generally be applied only
prospectively. However, if such ruling or guidance was not considered
 
                                       33
<PAGE>   39
 
to set forth a new position, it may be applied retroactively, resulting in the
Owner being retroactively determined to be the Owner of the assets of the
Separate Account.
 
     Due to the uncertainty in this area, the Company reserves the right to
modify the Contract in an attempt to maintain favorable tax treatment.
 
MULTIPLE CONTRACTS
 
     The Code provides that multiple non-qualified annuity contracts, which are
issued within a calendar year to the same contract owner by one company or its
affiliates, are treated as one annuity contract for purposes of determining the
tax consequences of any distribution. Such treatment may result in adverse tax
consequences, including more rapid taxation of the distributed amounts from such
combination of contracts. Owners should consult a tax adviser prior to
purchasing more than one non-qualified annuity contract in any calendar year.
 
CONTRACTS OWNED BY OTHER THAN NATURAL PERSONS
 
     Under Section 72(u) of the Code, the investment earnings on premiums for
the Contracts will be taxed currently to the Owner, if the Owner is a
non-natural person (e.g., a corporation or certain other entities). Such
Contracts generally will not be treated as annuities for federal income tax
purposes. However, this treatment is not applied to Contracts held by a trust or
other entity, as an agent for a natural person, nor to Contracts held by certain
Qualified Plans. Purchasers should consult their own tax counsel or other tax
adviser before purchasing a Contract to be owned by a non-natural person.
 
TAX TREATMENT OF ASSIGNMENTS
 
     An assignment or pledge of a Contract may be a taxable event. Owners should
therefore consult a competent tax adviser should they wish to assign or pledge
their Contracts.
 
INCOME TAX WITHHOLDING
 
     All distributions, or the portion thereof which is includible in the gross
income of the Owner, are subject to federal income tax withholding. Generally,
amounts are withheld from periodic payments at the same rate as wages and at the
rate of 10% from non-periodic payments. However, the Owner, in most cases, may
elect not to have taxes withheld or to have withholding done at a different
rate.
 
     Effective January 1, 1993, certain distributions from retirement plans
qualified under Section 401 or Section 403(b) of the Code, which are not
directly rolled over to another eligible retirement plan or individual
retirement account or individual retirement annuity, are subject to a mandatory
20% withholding for federal income tax. The 20% withholding requirement
generally does not apply to: (a) a series of substantially equal payments made
at least annually for the life or life expectancy of the participant or joint
and last survivor expectancy of the participant and a designated beneficiary, or
distributions for a specified period of 10 years or more; or (b) distributions
which are required minimum distributions; or (c) the portion of the
distributions not includible in gross income (i.e., returns of after-tax
contributions). Participants under such plans should consult their own tax
counsel or other tax adviser regarding withholding requirements.
 
TAX TREATMENT OF WITHDRAWALS -- NON-QUALIFIED CONTRACTS
 
     Section 72 of the Code governs treatment of distributions from annuity
contracts. It provides that if the contract value exceeds the aggregate purchase
payments made, any amount withdrawn will be treated as coming first from the
earnings and then, only after the income portion is exhausted, as coming from
the principal. Withdrawn earnings are includible in gross income. It further
provides that a 10% penalty will apply to the income portion of any
distribution. However, the penalty is not imposed on amounts received: (a) after
the taxpayer reaches age 59 1/2; (b) after the death of the Owner; (c) if the
taxpayer is totally disabled (for this purpose disability is as defined in
Section 72(m)(7) of the Code); (d) in a series of substantially equal periodic
payments made not less frequently than annually for the life (or life
expectancy) of the taxpayer, or
 
                                       34
<PAGE>   40
 
for the joint lives (or joint life expectancies) of the taxpayer and his or her
Beneficiary; (e) under an immediate annuity; or (f) which are allocable to
purchase payments made prior to August 14, 1982.
 
     The above information does not apply to Qualified Contracts. However,
separate tax withdrawal penalties and restrictions may apply to such Qualified
Contracts. (See "Tax Treatment of Withdrawals -- Qualified Contracts," below.)
 
QUALIFIED PLANS
 
     The Contracts offered by this Prospectus are designed to be suitable for
use under various types of qualified plans. Taxation of participants in each
qualified plan varies with the type of plan and terms and conditions of each
specific plan. Owners, Annuitants, and Beneficiaries are cautioned that benefits
under a Qualified Plan may be subject to the terms and conditions of the plan,
regardless of the terms and conditions of the Contracts issued pursuant to the
plan. Some retirement plans are subject to distribution and other requirements
that are not incorporated into the Company's administrative procedures. Owners,
participants, and Beneficiaries are responsible for determining that
contributions, distributions, and other transactions, with respect to the
Contracts, comply with applicable law. Following are general descriptions of the
types of qualified plans with which the Contracts may be used. Such descriptions
are not exhaustive and are for general informational purposes only. The tax
rules regarding qualified plans are very complex and will have differing
applications, depending on individual facts and circumstances. Each purchaser
should obtain competent tax advice prior to purchasing a Contract issued under a
Qualified Plan.
 
     Contracts issued pursuant to Qualified Plans include special provisions
restricting Contract provisions that may otherwise be available as described in
this Prospectus. Generally, Contracts issued pursuant to Qualified Plans are not
transferable except upon surrender or annuitization. Various penalty and excise
taxes may apply to contributions or distributions made in violation of
applicable limitations. Furthermore, certain withdrawal penalties and
restrictions may apply to surrenders from Qualified Contracts. (See "Tax
Treatment of Withdrawals -- Qualified Contracts," below.)
 
     On July 6, 1983, the Supreme Court decided, in Arizona Governing Committee
v. Norris, that optional annuity benefits provided under an employer's deferred
compensation plan could not, under Title VII of the Civil Rights Act of 1964,
vary between men and women. The Contracts sold by the Company, in connection
with certain Qualified Plans, will utilize annuity tables which do not
differentiate on the basis of sex. Such annuity tables will also be available
for use in connection with certain non-qualified deferred compensation plans.
 
  A. KEOGH PLANS
 
     Section 401 of the Code permits self-employed individuals to establish
Qualified Plans for themselves and their employees, commonly referred to as
"H.R. 10" or "Keogh" plans. Contributions made to the plan for the benefit of
the employees will not be included in the gross income of the employees until
distributed from the plan. The tax consequences to participants may vary
depending upon the particular plan design. However, the Code places limitations
and restrictions on all plans, including on such items as: amount of allowable
contributions; form, manner, and timing of distributions; transferability of
benefits; vesting and non-forfeitability of interests; nondiscrimination in
eligibility and participation; and the tax treatment of distributions,
withdrawals, and surrenders. (See "Tax Treatment of Withdrawals -- Qualified
Contracts," below.) Purchasers of Contracts for use with a Keogh plan should
obtain competent tax advice as to the tax treatment and suitability of such an
investment.
 
  B. TAX-SHELTERED ANNUITIES
 
     Section 403(b) of the Code permits the purchase of "tax-sheltered
annuities" by public schools and certain charitable, educational, and scientific
organizations described in Section 501(c)(3) of the Code. These qualifying
employers may make contributions to the Contracts for the benefit of their
employees. Such contributions are not includible in the gross income of the
employees until the employees receive distributions from the Contracts. The
amount of contributions to the tax-sheltered annuity is limited to certain
maximums
                                       35
<PAGE>   41
 
imposed by the Code. Furthermore, the Code sets forth additional restrictions
governing such items as transferability, distributions, nondiscrimination, and
withdrawals. (See "Tax Treatment of Withdrawals -- Qualified Contracts" and
"Tax-Sheltered Annuities -- Withdrawal Limitations," below.) Any employee should
obtain competent tax advice as to the tax treatment and suitability of such an
investment.
 
  C. INDIVIDUAL RETIREMENT ANNUITIES
 
  Non-Roth IRAs
 
     Section 408(b) of the Code permits eligible individuals to contribute to an
individual retirement program known as an Individual Retirement Annuity ("IRA").
Under applicable limitations, certain amounts may be contributed to an IRA which
will be deductible from the individual's gross income. These IRAs are subject to
limitations on eligibility, contributions, transferability, and distributions.
(See "Tax Treatment of Withdrawals -- Qualified Contracts," below.) Under
certain conditions, distributions from other IRAs and other Qualified Plans may
be rolled over or transferred on a tax-deferred basis into an IRA. Sales of
Contracts for use with IRAs are subject to special requirements imposed by the
Code, including the requirement that certain informational disclosures be given
to persons desiring to establish an IRA. Purchasers of Contracts to be qualified
as an IRA should obtain competent tax advice as to the tax treatment and
suitability of such an investment.
 
  Roth IRAs
 
     Beginning in 1998, individuals may purchase a new type of non-deductible
IRA, known as a Roth IRA. Purchase payments for a Roth IRA are limited to a
maximum of $2,000 per year. Lower maximum limitations apply to individuals with
adjusted gross incomes between $95,000 and $110,000 in the case of single
taxpayers, between $150,000 and $160,000 in the case of married taxpayers filing
joint returns, and between $0 and $10,000 in the case of married taxpayers
filing separately. An overall $2,000 annual limitation continues to apply to all
of a taxpayer's IRA contributions, including Roth IRA and non-Roth IRAs.
 
     Qualified distributions from Roth IRAs are free from federal income tax. A
qualified distribution requires that an individual has held the Roth IRA for at
least five years and, in addition, that the distribution is made either after
the individual reaches age 59 1/2, on the individual's death or disability, or
as a qualified first-time home purchase, subject to a $10,000 lifetime maximum,
for the individual, a spouse, child, grandchild, or ancestor. Any distribution
which is not a qualified distribution is taxable to the extent of earnings in
the distribution. Distributions are treated as made from contributions first and
therefore no distributions are taxable until distributions exceed the amount of
contributions to the Roth IRA. The 10% penalty tax and the regular IRA
exceptions to the 10% penalty tax apply to taxable distributions from a Roth
IRA.
 
     Amounts may be rolled over from one Roth IRA to another Roth IRA.
Furthermore, an individual may make a rollover contribution from a non-Roth IRA
to a Roth IRA, unless the individual has adjusted gross income over $100,000 or
the individual is a married taxpayer filing a separate return. The individual
must pay tax on any portion of the IRA being rolled over that represents income
or a previously deductible IRA contribution. However, for rollovers in 1998, the
individual may pay that tax ratably over the four taxable year periods beginning
with tax year 1998.
 
     Purchasers of Contracts to be qualified as a Roth IRA should obtain
competent tax advice as to the tax treatment and suitability of such an
investment.
 
  D. CORPORATE PENSION AND PROFIT SHARING PLANS
 
     Sections 401(a) and 401(k) of the Code permit corporate employers to
establish various types of retirement plans for employees. These retirement
plans may permit the purchase of the Contracts to provide benefits under the
Plan. Contributions to the Plan for the benefit of employees will not be
includible in the gross income of the employees until distributed from the Plan.
The tax consequences to participants may vary, depending upon the particular
plan design. However, the Code places limitations and restrictions on all plans,
including on such items as: amount of allowable contributions; form, manner, and
timing of distributions;
 
                                       36
<PAGE>   42
 
transferability of benefits; vesting and non-forfeitability of interests;
nondiscrimination in eligibility and participation; and the tax treatment of
distributions, withdrawals, and surrenders. (See "Tax Treatment of
Withdrawals -- Qualified Contracts," below.) Purchasers of Contracts for use
with Corporate Pension or Profit Sharing Plans should obtain competent tax
advice as to the tax treatment and suitability of such an investment.
 
TAX TREATMENT OF WITHDRAWALS -- QUALIFIED CONTRACTS
 
     In the case of a withdrawal under a Qualified Contract, a ratable portion
of the amount received is taxable, generally based on the ratio of the
individual's cost basis to the individual's total accrued benefit under the
retirement plan. Special tax rules may be available for certain distributions
from a Qualified Contract. Section 72(t) of the Code imposes a 10% penalty tax
on the taxable portion of any distribution from qualified retirement plans,
including Contracts issued and qualified under Code Sections 401 (Keogh and
Corporate Pension and Profit Sharing Plans), 403(b) (Tax-Sheltered Annuities),
and 408 and 408A (Individual Retirement Annuities). To the extent amounts are
not includible in gross income because they have been rolled over to an IRA or
another eligible qualified plan, no tax penalty will be imposed. The tax penalty
will not apply to the following distributions: (a) if distribution is made on or
after the date on which the Owner or Annuitant (as applicable) reaches age
59 1/2; (b) distributions following the death or disability of the Owner or
Annuitant (as applicable) (for this purpose disability is as defined in Section
72(m)(7) of the Code); (c) after separation from service, distributions that are
part of substantially equal periodic payments made not less frequently than
annually for the life (or life expectancy) of the Owner or Annuitant (as
applicable), or the joint lives (or joint life expectancies) of such Owner or
Annuitant (as applicable) and his or her designated Beneficiary; (d)
distributions to an Owner or Annuitant (as applicable) who has separated from
service after he has attained age 55; (e) distributions made to the Owner or
Annuitant (as applicable) to the extent such distributions do not exceed the
amount allowable as a deduction under Code Section 213 to the Owner or Annuitant
(as applicable) for amounts paid during the taxable year for medical care; (f)
distributions made to an alternate payee, pursuant to a qualified domestic
relations order; (g) distributions from an Individual Retirement Annuity for the
purchase of medical insurance (as described in Section 213(d)(1)(D) of the Code)
for the Contract Owner or Annuitant (as applicable) and his or her spouse and
dependents if the Contract Owner or Annuitant (as applicable) has received
unemployment compensation for at least 12 weeks (this exception will no longer
apply after the Contract Owner or Annuitant (as applicable) has been re-
employed for at least 60 days); (h) distributions from an Individual Retirement
Annuity made to the Owner or Annuitant (as applicable) to the extent such
distributions do not exceed the qualified higher education expenses (as defined
in Section 72(t)(7) of the Code) of the Owner or Annuitant (as applicable) for
the taxable year; and (i) distributions from an Individual Retirement Annuity
made to the Owner or Annuitant (as applicable) which are qualified first-time
home buyer distributions (as defined in Section 72(t)(8) of the Code). The
exceptions stated in (d) and (f) above do not apply in the case of an Individual
Retirement Annuity. The exception stated in (c) above applies to an Individual
Retirement Annuity without the requirement that there be a separation from
service.
 
     Generally, distributions from a qualified plan must commence no later than
April 1 of the calendar year following the later of: (a) the year in which the
employee attains age 70 1/2 , or (b) the calendar year in which the employee
retires. The date set forth in (b) above does not apply to an Individual
Retirement Annuity. Required distributions must be over a period not exceeding
the life expectancy of the individual or the joint lives or life expectancies of
the individual and his or her designated beneficiary. If the required minimum
distributions are not made, a 50% penalty tax is imposed as to the amount not
distributed.
 
TAX-SHELTERED ANNUITIES -- WITHDRAWAL LIMITATIONS
 
     The Code limits the withdrawal of amounts attributable to contributions
made pursuant to a salary reduction agreement (as defined in Section 403(b)(11)
of the Code) to circumstances only when the Owner: (a) attains age 59 1/2; (b)
separates from service; (c) dies; (d) becomes disabled (within the meaning of
Section 72(m)(7) of the Code); or (e) in the case of hardship. However,
withdrawals for hardship are restricted to the portion of the Owner's Contract
Value which represents contributions made by the Owner
 
                                       37
<PAGE>   43
 
and does not include any investment results. The limitations on withdrawals
became effective on January 1, 1989, and apply only to salary reduction
contributions made after December 31, 1988, to income attributable to such
contributions and to income attributable to amounts held as of December 31,
1988. The limitations on withdrawals do not affect rollovers or transfers
between certain Qualified Plans. Owners should consult their own tax counsel or
other tax adviser regarding any distributions.
 
SECTION 457 -- DEFERRED COMPENSATION PLANS
 
     Under Section 457 of the Code, governmental and certain other tax-exempt
employers may establish deferred compensation plans for the benefit of their
employees who may invest in annuity contracts. The Code, as in the case of
Qualified Plans, establishes limitations and restrictions on eligibility,
contributions, and distributions. Under these plans, contributions made for the
benefit of the employees will not be includible in the employee's gross income
until distributed from the plan. Under a Section 457 plan, all the plan assets
remain solely the property of the employer, subject only to the claims of the
employer's general creditors until such time as made available to the
participant or beneficiary. However, for plans established after August 20,
1996, it is required that plan assets be held in trust for the benefit of plan
participants and are not subject to the claims of the general creditors of the
employer. Furthermore, this requirement must be met for all plans no later than
January 1, 1999.
 
                                YEAR 2000 RISKS
 
     The Company is in the process of modifying its systems to achieve Year 2000
readiness. This endeavor is directed and managed by the Company and monitored by
the parent company, American General Corporation. The Company has developed
clearly defined and documented plans that have been implemented to minimize the
risk of significant negative impact on its operations.
 
     These plans include the following activities: (1) perform an inventory of
the Company's information technology and non-information technology systems; (2)
assess which items in the inventory may expose the Company to business
interruptions due to Year 2000 issues; (3) test systems for Year 2000 readiness;
(4) reprogram or replace systems that are not Year 2000 ready; and (5) return
the systems to operation. The Company expects to complete the forgoing
activities for all critical business systems relevant to the Separate Account by
December 1998.
 
     In addition, the Company has business relationships with various third
parties, each of which must also be Year 2000 ready. Therefore, the Company's
plans also include assessing and attempting to mitigate the risks associated
with the potential failure of third parties to achieve Year 2000 readiness. Due
to the various stages of the third parties' Year 2000 readiness, the Company's
efforts in this regard will extend through 1999.
 
     Through June 30, 1998 the Company has incurred and expensed $81,722
(pretax) related to Year 2000 readiness, including $40,369 incurred during the
first six months of 1998. The Company currently anticipates that it will incur
future costs of $1.2 million (pretax) for additional staff, third party vendors,
and other expenses to achieve Year 2000 readiness.
 
     Due to the magnitude and complexity of this project, risks and
uncertainties exist. If conversion of the Company's systems is not completed on
a timely basis (due to non-performance by significant third-party vendors or
other unforeseen circumstances), or if significant third parties fail to achieve
Year 2000 readiness on a timely basis, the Year 2000 issue could have a material
adverse impact on the operations of the Company and the Separate Account.
 
                              FINANCIAL STATEMENTS
 
     Financial Statements of the Company and the Separate Account have been
included in the SAI.
 
                               LEGAL PROCEEDINGS
 
     There are no material pending legal proceedings to which the Separate
Account, the Distributor, or the Company is a party.
 
                                       38
<PAGE>   44
 
                               TABLE OF CONTENTS
                   OF THE STATEMENT OF ADDITIONAL INFORMATION
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Company.....................................................   3
Independent Auditors........................................   3
Legal Opinions..............................................   3
Distributor.................................................   3
Yield Calculation for the State Street Global Advisors Money
  Market Sub-Account........................................   3
Performance Information.....................................   4
Annuity Provisions..........................................   6
Annuity Unit................................................   7
Financial Statements........................................   7
</TABLE>
 
                                       39
<PAGE>   45
 
                      STATEMENT OF ADDITIONAL INFORMATION
 
            INDIVIDUAL FIXED AND VARIABLE DEFERRED ANNUITY CONTRACTS
                        WITH FLEXIBLE PURCHASE PAYMENTS
 
                                   ISSUED BY
 
                             AGA SEPARATE ACCOUNT A
 
                                      AND
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
 
   
     THIS IS NOT A PROSPECTUS. THIS STATEMENT OF ADDITIONAL INFORMATION (THE
"SAI") SHOULD BE READ IN CONJUNCTION WITH THE PROSPECTUS DATED OCTOBER 28, 1998,
FOR THE INDIVIDUAL FIXED AND VARIABLE DEFERRED ANNUITY CONTRACTS WITH FLEXIBLE
PURCHASE PAYMENTS WHICH ARE REFERRED TO HEREIN.
    
 
   
     THE PROSPECTUS CONCISELY SETS FORTH INFORMATION FOR A PROSPECTIVE INVESTOR.
FOR A COPY OF THE PROSPECTUS, CALL 1-800-424-4990, OR WRITE THE COMPANY AT 205
E. 10TH AVENUE, AMARILLO, TEXAS 79101. THIS SAI IS DATED OCTOBER 28, 1998.
    
 
                                        1
<PAGE>   46
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Company.....................................................     3
Independent Auditors........................................     3
Legal Opinions..............................................     3
Distributor.................................................     3
Yield Calculation For The State Street Global Advisors Money
  Market Sub-Account........................................     3
Performance Information.....................................     4
Annuity Provisions..........................................     6
Annuity Unit................................................     7
Financial Statements........................................     7
</TABLE>
    
 
                                        2
<PAGE>   47
 
                                    COMPANY
 
     Information regarding American General Annuity Insurance Company (the
"Company") and its ownership is contained in the Prospectus. Effective February
25, 1998, the Company changed its name from Western National Life Insurance
Company to its present name.
 
     The Company contributed the initial capital to the AGA Separate Account A
(the "Separate Account"). As of December 31, 1997, the initial capital
contributed by the Company represented approximately 31% of the total assets of
the Separate Account. The Company currently intends to remove these assets from
the Separate Account on a pro rata basis in proportion to money invested in the
Separate Account by Owners.
 
                              INDEPENDENT AUDITORS
 
     The balance sheet of the Company as of December 31, 1997 and the related
statements of operations, shareholders' equity and cash flows for the year then
ended and the statement of assets and liabilities of the Separate Account as of
December 31, 1997, and the related statement of operations for the year ended
December 31, 1997, and the statement of changes in net assets for the year ended
December 31, 1997, all of which are included in the SAI, have been included
herein in reliance on the reports of Ernst & Young LLP, independent auditors
given on the authority of that firm as experts in accounting and auditing.
 
   
     The balance sheet of the Company as of December 31, 1996 and the related
statements of operations, shareholders' equity and cash flows for each of the
two years in the period ended December 31, 1996, and the statement of changes in
net assets of the Separate Account for the year ended December 31, 1996, all of
which are included in the SAI, have been included herein in reliance on the
reports of PricewaterhouseCoopers LLP, independent accountants, given on the
authority of that firm as experts in accounting and auditing.
    
 
                                 LEGAL OPINIONS
 
     Blazzard, Grodd & Hasenauer, P.C., Westport, Connecticut has provided
advice on certain matters relating to the federal securities and income tax laws
in connection with the Contracts.
 
                                  DISTRIBUTOR
 
     AGA Brokerage Services, Inc. ("AGA Brokerage"), (formerly known as WNL
Brokerage Services, Inc.) acts as the distributor. AGA Brokerage is an affiliate
of the Company. The offering is on a continuous basis.
 
                             YIELD CALCULATION FOR
           THE STATE STREET GLOBAL ADVISORS MONEY MARKET SUB-ACCOUNT
 
     The State Street Global Advisors Money Market Sub-Account of the Separate
Account will calculate its current yield based upon the seven days ended on the
date of calculation. For the seven calendar days ending December 31, 1997, the
annualized effective yield for the State Street Global Advisors Money Market
Sub-Account was 3.86% and the yield was 3.79%.
 
     The current yield of the State Street Global Advisors Money Market
Sub-Account is computed by determining the net change (exclusive of capital
changes) in the value of a hypothetical pre-existing Owner account having a
balance of one Accumulation Unit of the Sub-Account at the beginning of the
period, subtracting the Mortality and Expense Risk Charge, the Administrative
Charge, and the Contract Maintenance Charge, dividing the difference by the
value of the account at the beginning of the same period to obtain the base
period return, and multiplying the result by (365/7). The calculation does not
take into account any applicable Enhanced Death Benefit Charge or Annual Step-Up
Death Benefit Charge.
 
     For the seven calendar days ended December 31, 1997, the annualized
effective yield and yield for the State Street Global Advisors Money Market
Sub-Account calculated with the applicable Enhanced Death
 
                                        3
<PAGE>   48
 
   
Benefit Charge was 3.70% and 3.64%, respectively. There is no yield information
for the State Street Global Advisors Money Market Sub-Account calculated with
the applicable Annual Step-Up Death Benefit Charge because the Annual Step-Up
Death Benefit was not available until June 1, 1998.
    
 
     The State Street Global Advisors Money Market Sub-Account computes its
effective compound yield according to the method prescribed by the Securities
and Exchange Commission (the "SEC"). The effective yield reflects the
reinvestment of net income earned daily on State Street Global Advisors Money
Market Sub-Account assets.
 
     Net investment income for yield quotation purposes will not include either
realized capital gains and losses or unrealized appreciation and depreciation,
whether reinvested or not.
 
     The yields quoted should not be considered a representation of the yield of
the State Street Global Advisors Money Market Sub-Account in the future since
the yield is not fixed. Actual yields will depend not only on the type, quality,
and maturities of the investments held by the State Street Global Advisors Money
Market Sub-Account and changes in the interest rates on such investments, but
also on changes in the State Street Global Advisors Money Market Sub-Account's
expenses during the period.
 
     Yield information may be useful in reviewing the performance of the State
Street Global Advisors Money Market Sub-Account and for providing a basis for
comparison with other investment alternatives. However, the State Street Global
Advisors Money Market Sub-Account's yield fluctuates, unlike bank deposits or
other investments which typically pay a fixed yield for a stated period of time.
 
                            PERFORMANCE INFORMATION
 
     From time to time, the Company may advertise performance data as described
in the Prospectus. Any such advertisement will include three sets of total
return figures for the time periods indicated in the advertisement. One set of
such total return figures will reflect the deduction of a 1.25% Mortality and
Expense Risk Charge, a .15% Administrative Charge, the investment advisory fee
and expenses for the underlying Portfolio being advertised, and any applicable
Contract Maintenance Charge. A second set of such total return figures will
reflect the same deductions mentioned plus the deduction of a .05% Enhanced
Death Benefit Charge. A third set of such total return figures will reflect the
same deductions mentioned plus the deduction of .10% Annual Step-Up Death
Benefit Charge.
 
     The hypothetical value of a Contract purchased for the time periods
described in the advertisement will be determined by using the actual
Accumulation Unit values for an initial $1,000 purchase payment, and deducting
any applicable Contract Maintenance Charge to arrive at the ending hypothetical
value. The average annual total return is then determined by computing the fixed
interest rate that a $1,000 purchase payment would have to earn annually,
compounded annually, to grow to the hypothetical value at the end of the time
periods described. The formula used in these calculations is:
 
   
<TABLE>
<S>     <C>   <C>  <C>
P (1 + T)(n) = ERV
Where:    P   =    A hypothetical initial payment of $1,000
          T   =    Average annual total return
          n   =    Number of years
        ERV   =    Ending redeemable value at the end of the time periods used
                   (or fractional portion thereof) of a hypothetical $1,000
                   payment made at the beginning of the time periods used.
</TABLE>
    
 
     In addition to total return data, the Company may include yield information
in its advertisements. Each Sub-Account (other than the State Street Global
Advisors Money Market Sub-Account) for which the Company will advertise yield,
will show a yield quotation based on a 30-day (or one-month) period ended on the
date of the most recent balance sheet of the Separate Account included in the
registration statement,
 
                                        4
<PAGE>   49
 
computed by dividing the net investment income per Accumulation Unit earned
during the period by the maximum offering price per Unit on the last day of the
period, according to the following formula:
 
   
<TABLE>
<S>                              <C>         <C>    <C>     <C>   <C>  <C>  <C> 

                                               [(                  )        ]
                                                    a - b
                                   Yield = 2        -----   +1         (6) -1
                                                     cd
</TABLE>
    
 
   
<TABLE>
<S>     <C>   <C>  <C>
Where:
          a   =    Net investment income earned during the period by the
                   Portfolio attributable to shares owned by the Sub-Account.
          b   =    Expenses accrued for the period (net of reimbursements).
          c   =    The average daily number of Accumulation Units outstanding
                   during the period.
          d   =    The maximum offering price per Accumulation Unit on the last
                   day of the period.
</TABLE>
    
 
     The Company may also advertise performance data which will be computed on a
different basis.
 
     Investment operations for the Sub-Accounts which invest in Portfolios of
the AGA Series Trust (the "Trust") depicted in the chart below commenced on the
following dates:
 
   
<TABLE>
<CAPTION>
                         PORTFOLIO                             INCEPTION DATE
                         ---------                             --------------
<S>                                                            <C>
Credit Suisse Growth and Income Portfolio...................      10/20/95
Credit Suisse International Equity Portfolio................      10/20/95
EliteValue Portfolio........................................      01/02/96
State Street Global Advisors Growth Equity Portfolio........      10/20/95
State Street Global Advisors Money Market Portfolio.........      10/10/95
Salomon Brothers U.S. Government Securities Portfolio.......      02/06/96
Van Kampen Emerging Growth Portfolio........................      01/02/96
</TABLE>
    
 
     Chart 1 below shows performance figures which reflect the deduction of all
charges and deductions (except the Enhanced Death Benefit Charge or Annual
Step-Up Death Benefit Charge) under the Contracts (see "Charges and Deductions"
in the Prospectus) and also reflect the actual fees and expenses paid by the
underlying Portfolios. Chart 2 below is identical to Chart 1 except that it also
reflects the deduction of the Enhanced Death Benefit Charge, where applicable.
 
     NOTE: The figures below present investment performance information for the
periods ended June 30, 1998. While these numbers represent the returns as of
that date, they do not represent performance information of the portfolios since
that date. Performance information for periods after June 30, 1998 may be
significantly different (lower) than the numbers shown below.
 
   
AVERAGE TOTAL RETURN FOR THE PERIOD ENDED JUNE 30, 1998
    
 
  Chart 1
 
<TABLE>
<CAPTION>
                                                                              FROM
                        SUB-ACCOUNT                           ONE YEAR     INCEPTION
                        -----------                           --------     ----------
<S>                                                           <C>          <C>
Credit Suisse Growth and Income Portfolio...................    14.49%       17.52%
Credit Suisse International Equity Portfolio................   (11.46)%       8.58%
EliteValue Portfolio........................................    13.47%       21.39%
State Street Global Advisors Money Market Portfolio.........    (1.06)%       2.15%
State Street Global Advisors Growth Equity Portfolio........    23.80%       25.00%
Van Kampen Emerging Growth Portfolio........................    28.59%       22.57%
Salomon Brothers U.S. Government Securities Portfolio.......     2.50%        3.17%
</TABLE>
 
                                        5
<PAGE>   50
 
  Chart 2
 
<TABLE>
<CAPTION>
                                                                              FROM
                        SUB-ACCOUNT                           ONE YEAR     INCEPTION
                        -----------                           --------     ---------
<S>                                                           <C>          <C>
Credit Suisse Growth & Income Portfolio.....................    14.34%       17.37%
Credit Suisse International Equity Portfolio................   (11.61)%       8.43%
EliteValue Portfolio........................................    13.32%       21.24%
State Street Global Advisors Money Market Portfolio.........    (1.21)%       2.00%
State Street Global Advisors Growth Equity Portfolio........    23.65%       24.85%
Van Kampen Emerging Growth Portfolio........................    28.44%       22.42%
Salomon Brothers U.S. Government Securities Portfolio.......     2.35%        3.02%
</TABLE>
 
   
     Owners should note that the investment results of each Sub-Account will
fluctuate over time, and any presentation of the Sub-Account's total return or
yield for any period should not be considered a representation of what an
investment may earn or what an Owner's total return or yield may be in any
future period.
    
 
                               ANNUITY PROVISIONS
 
     A Variable Annuity is an annuity with payments which: (a) are not
predetermined as to dollar amount and (b) will vary in amount with the net
investment results of the applicable Sub-Accounts of the Separate Account.
Annuity Payments also depend upon the Age of the Annuitant and any Joint
Annuitant and the assumed interest factor utilized. The Annuity Table used will
depend upon the Annuity Option chosen. The dollar amount of Annuity Payments
after the first is determined as follows:
 
          1. The dollar amount of the first Variable Annuity Payment is divided
     by the value of an Annuity Unit for each applicable Sub-Account as of the
     Annuity Date. This sets the number of Annuity Units for each monthly
     payment for the applicable Sub-Account. The number of Annuity Units remains
     fixed during the Annuity Period.
 
          2. The fixed number of Annuity Units per payment in each Sub-Account
     is multiplied by the Annuity Unit Value for that Sub-Account for the last
     Valuation Period of the month preceding the month for which the payment is
     due. This result is the dollar amount of the payment for each applicable
     Sub-Account.
 
     The total dollar amount of each Variable Annuity Payment is the sum of all
Sub-Account Variable Annuity Payments reduced by the applicable portion of the
Contract Maintenance Charge.
 
     The dollar amount of the first Variable Annuity payment is determined in
accordance with the description above.
 
                                  ANNUITY UNIT
 
     The value of any Annuity Unit for each Sub-Account of the Separate Account
was set initially at $10. The Sub-Account Annuity Unit value at the end of any
subsequent Valuation Period is determined as follows:
 
          1. The Net Investment Factor for the current Valuation Period is
     multiplied by the value of the Annuity Unit for the Sub-Account for the
     immediately preceding Valuation Period.
 
          2. The result in (1) is then divided by the Assumed Investment Rate
     Factor, which equals 1.00, plus the Assumed Investment Rate for the number
     of days since the preceding Valuation Date. The Assumed Investment Rate is
     equal on an annual rate to 3%.
 
     The value of an Annuity Unit may increase or decrease from Valuation Period
to Valuation Period.
 
                                        6
<PAGE>   51
 
                              FINANCIAL STATEMENTS
 
     The financial statements of the Company included herein should be
considered only as bearing upon the ability of the Company to meet its
obligations under the Contracts.
 
                                        7
<PAGE>   52
 
                              FINANCIAL STATEMENTS
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
                     YEARS ENDED DECEMBER 31, 1997 AND 1996
<PAGE>   53
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
                              FINANCIAL STATEMENTS
                     YEARS ENDED DECEMBER 31, 1997 AND 1996
 
                                    CONTENTS
 
<TABLE>
<S>                                                            <C>
Report of Independent Auditors..............................    F-2
Report of Independent Accountants...........................    F-3
Audited Financial Statements................................    F-4
Statement of Assets and Liabilities.........................    F-4
Statement of Operations.....................................    F-6
Statement of Changes in Net Assets..........................    F-8
Notes to Financial Statements...............................   F-12
</TABLE>
 
                                       F-1
<PAGE>   54
 
                         REPORT OF INDEPENDENT AUDITORS
 
Board of Directors and Stockholders
American General Annuity Insurance Company
 
     We have audited the accompanying statement of assets and liabilities of AGA
Separate Account A (the "Company"), formerly known as WNL Separate Account A, as
of December 31, 1997, and the related statements of operations and changes in
net assets for the year ended December 31, 1997. These financial statements are
the responsibility of the Company's management. Our responsibility is to express
an opinion on these financial statements based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform our 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 shares owned as of December 31, 1997, by correspondence with AGA
Series Trust, formerly known as WNL Series Trust. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of AGA Separate Account A as of
December 31, 1997, the results of its operations, and the changes in its net
assets for the year ended December 31, 1997 in conformity with generally
accepted accounting principles.
 
                                            ERNST & YOUNG, LLP
Houston, Texas
May 12, 1998
 
                                       F-2
<PAGE>   55
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
Board of Directors and Stockholders
American General Annuity Insurance Company
 
     We have audited the accompanying statement of changes in net assets and
liabilities of AGA Separate Account A, formerly known as WNL Separate Account A,
for the year ended December 31, 1996. This financial statement is the
responsibility of the Company's management. Our responsibility is to express an
opinion on this financial statement based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statement is free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statement. Our procedures included
confirmation of securities owned as of December 31, 1996, by correspondence with
AGA Series Trust, formerly known as WNL Series Trust. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.
 
     In our opinion, the financial statement referred to above presents fairly,
in all material respects, the change in net assets of AGA Separate Account A for
the year ended December 31, 1996, in conformity with generally accepted
accounting principles.
 
                                            COOPERS & LYBRAND L.L.P.
Houston, Texas
February 20, 1997
 
                                       F-3
<PAGE>   56
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
                      STATEMENT OF ASSETS AND LIABILITIES
                               DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                                  GLOBAL         GLOBAL                    CREDIT SUISSE
                                                 ADVISORS       ADVISORS      BEA GROWTH   INTERNATIONAL
                                               MONEY MARKET   GROWTH EQUITY   AND INCOME      EQUITY
                                                PORTFOLIO       PORTFOLIO     PORTFOLIO      PORTFOLIO
                                               ------------   -------------   ----------   -------------
<S>                                            <C>            <C>             <C>          <C>
ASSETS
Investments:
  Net asset value per share..................   $     1.00     $    14.07     $    12.72    $    10.35
                                                ==========     ==========     ==========    ==========
  Number of shares...........................    5,100,264        520,790        580,614       416,640
                                                ==========     ==========     ==========    ==========
  Identified cost............................   $5,100,264     $6,388,545     $6,696,262    $4,483,037
                                                ==========     ==========     ==========    ==========
  Market value...............................   $5,100,264     $7,327,014     $7,387,997    $4,310,325
                                                ==========     ==========     ==========    ==========
Net assets...................................   $5,100,264     $7,327,014     $7,387,997    $4,310,325
                                                ==========     ==========     ==========    ==========
Net assets attributable to:
  Contract owners............................   $4,987,695     $4,016,674     $4,408,639    $1,784,958
  American General Annuity Insurance Company
     (Note 7)................................      112,569      3,310,340      2,979,358     2,525,367
                                                ----------     ----------     ----------    ----------
                                                $5,100,264     $7,327,014     $7,387,997    $4,310,325
                                                ==========     ==========     ==========    ==========
Accumulation units of contract owners:
  Standard benefit units.....................    444,954.0      231,208.0      262,116.1     126,400.0
  Enhanced benefit units.....................     13,476.5       19,281.5       44,598.0      19,510.4
Accumulation value per unit:
  Standard benefit units.....................   $    10.88     $    16.04     $    14.38    $    12.24
  Enhanced benefit units.....................   $    10.84     $    15.99     $    14.33    $    12.20
</TABLE>
 
                            See accompanying notes.
 
                                       F-4
<PAGE>   57
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
               STATEMENT OF ASSETS AND LIABILITIES -- (CONTINUED)
                               DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                                      VAN KAMPEN
                                                       AMERICAN         SALOMON
                                                       CAPITAL         BROTHERS        ELITE VALUE
                                                       EMERGING     U.S. GOVERNMENT       ASSET
                                                        GROWTH        SECURITIES       ALLOCATION
                                                      PORTFOLIO        PORTFOLIO        PORTFOLIO
                                                      ----------    ---------------    -----------
<S>                                                   <C>           <C>                <C>
ASSETS
Investments:
  Net asset value per share.........................  $    13.87      $    10.07       $    14.38
                                                      ==========      ==========       ==========
  Number of shares..................................     396,522         395,899          658,676
                                                      ==========      ==========       ==========
  Identified cost...................................  $4,916,092      $3,968,605       $8,759,846
                                                      ==========      ==========       ==========
  Market value......................................  $5,498,597      $3,985,899       $9,470,619
                                                      ==========      ==========       ==========
Net assets..........................................  $5,498,597      $3,985,899       $9,470,619
                                                      ==========      ==========       ==========
Net assets attributable to:
  Contract owners...................................  $4,781,451      $1,734,114       $7,936,388
  American General Annuity Insurance Company (Note
     7).............................................     717,146       2,251,785        1,534,231
                                                      ----------      ----------       ----------
                                                      $5,498,597      $3,985,899       $9,470,619
                                                      ==========      ==========       ==========
Accumulation units of contract owners:
  Standard benefit units............................   303,011.2       126,832.5        461,930.1
  Enhanced benefit units............................    41,160.9        32,205.2         72,104.8
Accumulation value per unit:
  Standard benefit units............................  $    13.90      $    10.91       $    14.87
  Enhanced benefit units............................  $    13.85      $    10.87       $    14.82
</TABLE>
 
                            See accompanying notes.
 
                                       F-5
<PAGE>   58
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
                            STATEMENT OF OPERATIONS
                          YEAR ENDED DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                         GLOBAL ADVISORS   GLOBAL ADVISORS   BEA GROWTH    CREDIT SUISSE
                                          MONEY MARKET      GROWTH EQUITY    AND INCOME    INTERNATIONAL
                                            PORTFOLIO         PORTFOLIO      PORTFOLIO    EQUITY PORTFOLIO
                                         ---------------   ---------------   ----------   ----------------
<S>                                      <C>               <C>               <C>          <C>
Investment income:
  Income:
     Dividends.........................     $159,789         $   69,791       $138,994       $ 125,860
  Expenses:
     Mortality and expense risk and
       administrative fees.............       40,568             32,350         31,908          14,538
                                            --------         ----------       --------       ---------
Net investment income..................      119,221             37,441        107,086         111,322
Realized and unrealized gain (loss) on
  investments:
  Net realized gain on sale of Trust
     shares............................           --            130,354        100,916          13,670
  Net unrealized gain (loss) on Trust
     shares............................           --            531,795        480,921        (288,014)
  Capital gain distributions from the
     Trust.............................           --            636,692        237,747         174,638
                                            --------         ----------       --------       ---------
Net realized and unrealized gain (loss)
  on investments.......................           --          1,298,841        819,584         (99,706)
                                            --------         ----------       --------       ---------
Increase in net assets resulting from
  operations...........................     $119,221         $1,336,282       $926,670       $  11,616
                                            ========         ==========       ========       =========
</TABLE>
 
                            See accompanying notes.
 
                                       F-6
<PAGE>   59
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
                     STATEMENT OF OPERATIONS -- (CONTINUED)
                          YEAR ENDED DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                        VAN KAMPEN
                                         AMERICAN                       SALOMON
                                         CAPITAL                       BROTHERS
                                         EMERGING     BLACKROCK     U.S. GOVERNMENT     ELITE VALUE
                                          GROWTH     MANAGED BOND     SECURITIES      ASSET ALLOCATION
                                        PORTFOLIO     PORTFOLIO        PORTFOLIO         PORTFOLIO
                                        ----------   ------------   ---------------   ----------------
<S>                                     <C>          <C>            <C>               <C>
Investment income:
  Income:
     Dividends........................   $  7,882      $199,788        $160,062           $ 86,761
  Expenses:
     Mortality and expense risk and
       administrative fees............     41,734         7,886           6,091             58,704
                                         --------      --------        --------           --------
Net investment income (loss)..........    (33,852)      191,902         153,971             28,057
Realized and unrealized gain (loss) on
  investments:
  Net realized gain on sale of Trust
     shares...........................     20,833        49,882           3,525            205,487
  Net unrealized gain on Trust
     shares...........................    581,783        62,853          58,319            403,870
  Capital gain distributions from the
     Trust............................         --        28,519              --            213,790
                                         --------      --------        --------           --------
Net realized and unrealized gain on
  investments.........................    602,616       141,254          61,844            823,147
                                         --------      --------        --------           --------
Increase in net assets resulting from
  operations..........................   $568,764      $333,156        $215,815           $851,204
                                         ========      ========        ========           ========
</TABLE>
 
                            See accompanying notes.
 
                                       F-7
<PAGE>   60
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
                       STATEMENT OF CHANGES IN NET ASSETS
                          YEAR ENDED DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                         GLOBAL ADVISORS   GLOBAL ADVISORS   BEA GROWTH    CREDIT SUISSE
                                          MONEY MARKET      GROWTH EQUITY    AND INCOME    INTERNATIONAL
                                            PORTFOLIO         PORTFOLIO      PORTFOLIO    EQUITY PORTFOLIO
                                         ---------------   ---------------   ----------   ----------------
<S>                                      <C>               <C>               <C>          <C>
Increase in net assets from operations:
  Net investment income................   $    119,221       $   37,441      $  107,086      $  111,322
  Net realized gain on investments.....             --          130,354         100,916          13,670
  Net unrealized gain (loss) on
     investments.......................             --          531,795         480,921        (288,014)
  Realized gain distributions
     reinvested........................             --          636,692         237,747         174,638
                                          ------------       ----------      ----------      ----------
Increase in net assets from
  operations...........................        119,221        1,336,282         926,670          11,616
Increase (decrease) in net assets from
  variable annuity contract
  transactions:
  Contract purchase payments...........     21,397,097          542,144         862,564         357,394
  Surrenders and withdrawals...........       (777,511)         (76,995)        (81,416)        (67,495)
  Death benefit payments...............             --          (18,871)             --              --
  Transfers (to) from general
     account...........................     (2,621,752)           2,689         (10,270)          2,524
  Intra-portfolio transfers............    (14,307,815)       2,121,299       2,545,350       1,279,304
                                          ------------       ----------      ----------      ----------
Increase (decrease) in net assets from
  variable annuity contract
  transactions.........................      3,690,019        2,570,266       3,316,228       1,571,727
Capital distribution to American
  General Annuity Insurance Company:...             --               --              --              --
                                          ------------       ----------      ----------      ----------
  Total increase (decrease) in net
     assets............................      3,809,240        3,906,548       4,242,898       1,583,343
  Net assets at beginning of year......      1,291,024        3,420,466       3,145,099       2,726,982
                                          ------------       ----------      ----------      ----------
  Net assets at end of year............   $  5,100,264       $7,327,014      $7,387,997      $4,310,325
                                          ============       ==========      ==========      ==========
</TABLE>
 
                            See accompanying notes.
 
                                       F-8
<PAGE>   61
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
               STATEMENT OF CHANGES IN NET ASSETS -- (CONTINUED)
                          YEAR ENDED DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                        VAN KAMPEN
                                         AMERICAN                       SALOMON
                                         CAPITAL                       BROTHERS
                                         EMERGING     BLACKROCK     U.S. GOVERNMENT     ELITE VALUE
                                          GROWTH     MANAGED BOND     SECURITIES      ASSET ALLOCATION
                                        PORTFOLIO     PORTFOLIO        PORTFOLIO         PORTFOLIO
                                        ----------   ------------   ---------------   ----------------
<S>                                     <C>          <C>            <C>               <C>
Increase in net assets from
  operations:
  Net investment income (loss)........  $  (33,852)  $   191,902      $  153,971         $   28,057
  Net realized gain on investments....      20,833        49,882           3,525            205,487
  Net unrealized gain on
     investments......................     581,783        62,853          58,319            403,870
  Realized gain distributions
     reinvested.......................          --        28,519              --            213,790
                                        ----------   -----------      ----------         ----------
Increase in net assets from
  operations..........................     568,764       333,156         215,815            851,204
Increase (decrease) in net assets from
  variable annuity contract
  transactions:
  Contract purchase payments..........     867,637       250,628          92,161          1,260,185
  Surrenders and withdrawals..........     (60,234)      (38,350)        (40,812)          (171,166)
  Death benefit payments..............     (16,672)           --              --                 --
  Transfers to general account........     (21,657)           --              --             (8,947)
  Intra-portfolio transfers...........   2,278,922      (521,383)      1,372,018          5,232,305
                                        ----------   -----------      ----------         ----------
Increase (decrease) in net assets from
  variable annuity contract
  transactions........................   3,047,996      (309,105)      1,423,367          6,312,377
Capital distribution to American
  General Annuity Insurance
  Company:............................          --    (3,400,169)             --                 --
                                        ----------   -----------      ----------         ----------
  Total increase (decrease) in net
     assets...........................   3,616,760    (3,376,118)      1,639,182          7,163,581
  Net assets at beginning of year.....   1,881,837     3,376,118       2,346,717          2,307,038
                                        ----------   -----------      ----------         ----------
  Net assets at end of year...........  $5,498,597   $        --      $3,985,899         $9,470,619
                                        ==========   ===========      ==========         ==========
</TABLE>
 
                            See accompanying notes.
 
                                       F-9
<PAGE>   62
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
               STATEMENT OF CHANGES IN NET ASSETS -- (CONTINUED)
                          YEAR ENDED DECEMBER 31, 1996
 
<TABLE>
<CAPTION>
                                         GLOBAL ADVISORS   GLOBAL ADVISORS   BEA GROWTH    CREDIT SUISSE
                                          MONEY MARKET      GROWTH EQUITY    AND INCOME    INTERNATIONAL
                                            PORTFOLIO         PORTFOLIO      PORTFOLIO    EQUITY PORTFOLIO
                                         ---------------   ---------------   ----------   ----------------
<S>                                      <C>               <C>               <C>          <C>
Increase in net assets from operations:
  Net investment income (loss).........    $    28,527       $   42,344      $  115,002      $   85,456
  Net realized gain (loss) on
     investments.......................             --            2,446             649           3,291
  Net unrealized gain (loss) on
     investments.......................             --          345,342         118,099          48,275
  Realized gain distributions
     reinvested........................             --          123,806         102,803         223,678
                                           -----------       ----------      ----------      ----------
Increase in net assets from
  operations...........................         28,527          513,938         336,553         360,700
Increase (decrease) in net assets from
  variable annuity contract
  transactions:
  Contract purchase payments...........      5,880,850           65,850          65,642          12,334
  Surrenders and withdrawals...........         (3,961)          (2,169)         (3,500)         (9,327)
  Death benefit payments...............             --               --              --              --
  Transfers to general account.........       (483,232)              --              --              --
  Intra-portfolio transfers............     (4,257,439)         770,208         610,085         280,251
                                           -----------       ----------      ----------      ----------
Increase in net assets from variable
  annuity contract transactions........      1,136,218          833,889         672,227         283,258
Capital distribution from American
  General Annuity Insurance Company:...             --               --              --              --
                                           -----------       ----------      ----------      ----------
  Total increase in net assets.........      1,164,745        1,347,827       1,008,780         643,958
  Net assets at beginning of year......        126,279        2,072,639       2,136,319       2,083,024
                                           -----------       ----------      ----------      ----------
  Net assets at end of year............    $ 1,291,024       $3,420,466      $3,145,099      $2,726,982
                                           ===========       ==========      ==========      ==========
</TABLE>
 
                            See accompanying notes.
 
                                      F-10
<PAGE>   63
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
               STATEMENT OF CHANGES IN NET ASSETS -- (CONTINUED)
                          YEAR ENDED DECEMBER 31, 1996
 
<TABLE>
<CAPTION>
                                      VAN KAMPEN
                                       AMERICAN                         SALOMON
                                       CAPITAL       BLACKROCK         BROTHERS
                                       EMERGING       MANAGED       U.S. GOVERNMENT      ELITE VALUE
                                        GROWTH          BOND          SECURITIES       ASSET ALLOCATION
                                      PORTFOLIO      PORTFOLIO         PORTFOLIO          PORTFOLIO
                                      ----------    ------------    ---------------    ----------------
<S>                                   <C>           <C>             <C>                <C>
Increase in net assets from
  operations:
  Net investment income (loss)......  $   (4,773)    $  187,081       $  119,192          $   20,518
  Net realized gain (loss) on
     investments....................      83,267           (116)            (225)              2,490
  Net unrealized gain (loss) on
     investments....................         622        (62,846)         (41,021)            306,894
  Realized gain distributions
     reinvested.....................      49,696             --               --              28,615
                                      ----------     ----------       ----------          ----------
Increase in net assets from
  operations........................     128,812        124,119           77,946             358,517
Increase (decrease) in net assets
  from variable annuity contract
  transactions:
  Contract purchase payments........     122,596          1,882              400              31,419
  Surrenders and withdrawals........      (4,606)          (915)         (10,042)            (12,454)
  Death benefit payments............          --             --               --                  --
  Transfers to general account......          --             --               --                  --
  Intra-portfolio transfers.........   1,135,035        251,032          278,413             929,556
                                      ----------     ----------       ----------          ----------
Increase in net assets from variable
  annuity contract transactions.....   1,253,025        251,999          268,771             948,521
Capital distribution from American
  General Annuity Insurance
  Company: .........................     500,000      3,000,000        2,000,000           1,000,000
                                      ----------     ----------       ----------          ----------
  Total increase in net assets......   1,881,837      3,376,118        2,346,717           2,307,038
  Net assets at beginning of year...          --             --               --                  --
                                      ----------     ----------       ----------          ----------
  Net assets at end of year.........  $1,881,837     $3,376,118       $2,346,717          $2,307,038
                                      ==========     ==========       ==========          ==========
</TABLE>
 
                            See accompanying notes.
 
                                      F-11
<PAGE>   64
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
                         NOTES TO FINANCIAL STATEMENTS
                               DECEMBER 31, 1997
 
1. ORGANIZATION
 
     AGA Separate Account A (the "Separate Account"), formerly known as WNL
Separate Account A, was established by (the "Company"), formerly known as
Western National Life Insurance Company, to fund variable annuity insurance
contracts issued by the Company. The Separate Account is registered with the
Securities and Exchange Commission as a unit investment trust pursuant to the
provisions of the Investment Company Act of 1940, as amended.
 
     The Separate Account is divided into seven sub-accounts. Each sub-account
invests in one portfolio of AGA Series Trust (the "Trust"), formerly known as
WNL Series Trust. The Trust is managed by AGA Investment Advisory Services, Inc.
(the "Adviser"), formerly known as WNL Investment Advisory Services, Inc., an
affiliate of the Company. As of December 31, 1997, the Trust portfolios
available to contract holders through the various sub-accounts ("Portfolios")
are as follows:
 
     AGA Series Trust:
          Global Advisors Money Market Portfolio
          Global Advisors Growth Equity Portfolio
          BEA Growth and Income Portfolio
          Credit Suisse International Equity Portfolio
          Van Kampen American Capital Emerging Growth Portfolio (formerly
              American Capital Emerging Growth Portfolio)
          Salomon Brothers U.S. Government Securities Portfolio
          Elite Value Asset Allocation Portfolio (formerly Quest for Value Asset
              Allocation Portfolio)
 
     In addition to the seven sub-accounts above, a contract owner may allocate
contract funds to a fixed account, which is part of the Company's general
account. Contract owners should refer to the "ElitePlus Bonus Variable Annuity
Prospectus" for a complete description of the Trust portfolios.
 
     During 1997, the BlackRock Managed Bond sub-account was eliminated as one
of the investment options of the contract owners. Contract owners were given the
opportunity to transfer their BlackRock Managed Bond sub-account value to any
other sub-account without limitation or changes prior to December 17, 1997.
Thereafter, shares of the Salomon Brothers U.S. Government Securities Portfolio
were substituted for shares of the BlackRock Managed Bond Portfolio.
 
     Net premiums from the contracts are allocated to the sub-accounts and
invested in the Portfolios in accordance with contract owner instructions and
are recorded as variable annuity contract transactions in the statement of
changes in net assets. There is no assurance that the investment objectives of
any of the Portfolios will be met. Contract owners bear the complete investment
risk for purchase payments allocated to a sub-account.
 
2. SIGNIFICANT ACCOUNTING POLICIES
 
     The accompanying financial statements of the Separate Account have been
prepared on the basis of generally accepted accounting principles. The
accounting principles followed by the Separate Account and the methods of
applying those principles are presented below or in the footnotes which follow.
 
  Investment Valuation
 
     The investment shares of the Portfolios are valued at the closing net asset
value (market) per share as determined by the fund on the day of measurement.
Changes in the economic environment have a direct impact on the net asset value
per share of a portfolio. It is reasonably possible that changes in the economic
                                      F-12
<PAGE>   65
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
environment will occur in the near term and that such changes will have a
material effect on the net asset value per share of the Portfolios included in
the Trust.
 
  Investment Transactions and Related Investment Income
 
     Investment transactions are accounted for on the date the order to buy or
sell is executed (trade date). Dividend income and distributions of capital
gains are recorded on the ex-dividend date. Realized gains and losses from
investment transactions are reported on the basis of first-in, first-out for
financial reporting and federal income tax purposes.
 
  Annuity Reserves
 
     At December 31, 1997, the Separate Account did not have contracts in the
annuity pay-out phase; therefore, no future policy benefit reserve was required.
 
  Federal Income Taxes
 
     The Company is taxed as a life insurance company and includes the
operations of the Separate Account in its federal income tax return. As a
result, the Separate Account is not taxed as a "Regulated Investment Company"
under subchapter M of the Internal Revenue Code. Under existing laws, taxes are
not currently payable on the investment income on the realized gains of the
Separate Account. The Company reserves the right to allocate to the Separate
Account any federal, state, or other tax liability that may result in the future
from maintenance of the Separate Account.
 
  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 reported amounts of assets and liabilities and the
reported amounts of income and expenses during the period. Actual results could
differ from those estimates.
 
3. CONTRACT CHARGES
 
     Deductions for the administrative expenses and mortality and expense risks
assumed by the Company are calculated daily, at an annual rate, on the average
daily net asset value of the Portfolios attributable to the contract owners and
are paid to the Company. The annual rate for administrative expenses is .15% and
the annual rate for the mortality and expense risks is 1.25%. The annual rate
for enhanced death benefit option is .15%. For the year ended December 31, 1997,
deductions for administrative expenses and mortality and expense risk charges
were $24,727 and $209,050, respectively.
 
     An annual maintenance charge of $30 per contract is assessed on the
contract anniversary during the accumulation period for the maintenance of the
contract. The maintenance charge is not assessed if the contract value on the
contract anniversary equals or exceeds $40,000. Maintenance charges totaled
$7,212 for the year ended December 31, 1997.
 
     A contingent deferred sales charge is applicable to certain contract
withdrawals pursuant to the contract and is payable to the Company. For the year
ended December 31, 1997, deferred sales charges totaled $20,229 and are included
as a component of surrenders and withdrawals on the statement of changes in net
assets.
 
     There are other deductions from and expenses (including management fees
paid to the investment adviser as other expenses) paid out of the assets of the
Trust. As full compensation for its services under the Investment Advisory
Agreement, the Adviser receives a monthly fee from the Trust based on annual
rates
 
                                      F-13
<PAGE>   66
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
which range from .45% to .90% based on the average daily net assets of each
Portfolio. The Adviser has waived that portion of its management fee which is in
excess of the amount payable by the Adviser to each sub-adviser pursuant to the
respective subadvisory agreements for each Portfolio through May 1, 1998. In
addition, the Company reimbursed each Portfolio for all operating expenses,
excluding management fees, that exceeded .12% of each Portfolio's average daily
net assets through May 1, 1998.
 
     For the year ended December 31, 1997, the Adviser waived advisory fees and
the Company reimbursed operating expenses as follows:
 
<TABLE>
<CAPTION>
                                                               ADVISORY       EXPENSES
                                                              FEES WAIVED    REIMBURSED
                                                              -----------    ----------
<S>                                                           <C>            <C>
Global Advisors Money Market Portfolio......................    $ 7,387       $106,355
Global Advisors Growth Equity Portfolio.....................    $13,030       $133,368
BEA Growth and Income Portfolio.............................    $12,263       $117,412
Credit Suisse International Equity Portfolio................    $ 9,113       $147,213
Van Kampen American Capital Emerging Growth Portfolio.......    $ 8,943       $170,896
Salomon Brothers U.S. Government Securities Portfolio.......    $ 6,395       $104,434
Elite Value Asset Allocation Portfolio......................    $13,732       $109,560
</TABLE>
 
4. PURCHASE AND SALE OF INVESTMENTS
 
     Portfolio shares are purchased at net asset value with net contract
payments (contract purchase payments less surrenders) and with reinvestment of
dividend and capital distributions made by the Portfolios. The aggregate cost of
purchases and proceeds from sales of investment in the Trust shares for the year
ended December 31, 1997 was $40,050,074 and $19,281,037, respectively, and
$21,165,690 and $7,804,034, respectively, for the year ended December 31, 1996.
The cost of total investments in Trust shares owned at December 31, 1997 and
1996 was the same for financial reporting and federal income tax purposes. At
December 31, 1997, gross unrealized appreciation and depreciation on Trust
shares was $2,940,777 and $172,712, respectively.
 
5. NET INCREASE (DECREASE) IN ACCUMULATION UNITS
 
     The Company offers owners standard and enhanced death benefit contracts,
which differ in the calculation of death benefits and related charges.
 
                                      F-14
<PAGE>   67
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     The increase (decrease) in accumulation units for the years ended are as
follows:
 
     For the year ended December 31, 1997:
 
<TABLE>
<CAPTION>
                                  GLOBAL ADVISORS    GLOBAL ADVISORS      BEA GROWTH        CREDIT SUISSE
                                   MONEY MARKET       GROWTH EQUITY       AND INCOME        INTERNATIONAL
                                     PORTFOLIO          PORTFOLIO          PORTFOLIO       EQUITY PORTFOLIO
                                  ---------------    ---------------    ---------------    ----------------
<S>                               <C>                <C>                <C>                <C>
Standard benefit units:
  Outstanding at beginning of
     year.......................       109,837.9         68,154.9           48,634.3            17,186.2
  Increase for payments
     received...................     1,748,815.9         35,404.8           60,968.9            26,594.6
  Decrease for surrendered
     contracts..................       (62,967.4)        (4,923.2)          (5,242.9)           (2,943.8)
  Decrease for death claims.....              --         (1,202.5)                --                  --
  Change for net interfund
     exchanges..................    (1,350,732.4)       133,774.0          157,755.8            85,563.0
                                   -------------       ----------         ----------          ----------
  Outstanding at end of
     period.....................       444,954.0        231,208.0          262,116.1           126,400.0
                                   =============       ==========         ==========          ==========
Enhanced benefit units:
  Outstanding at beginning of
     year.......................         3,403.7          5,232.7           11,709.8             8,510.2
  Increase for payments
     received...................       254,399.5            225.9              658.6                88.1
  Decrease for surrendered
     contracts..................       (10,056.9)          (312.5)            (845.4)           (2,159.1)
  Decrease for death claims.....              --               --                 --                  --
  Change for net interfund
     exchanges..................      (234,269.8)        14,135.4           33,075.0            13,071.2
                                   -------------       ----------         ----------          ----------
  Outstanding at end of
     period.....................        13,476.5         19,281.5           44,598.0            19,510.4
                                   =============       ==========         ==========          ==========
</TABLE>
 
<TABLE>
<CAPTION>
                                    VAN KAMPEN
                                     AMERICAN                               SALOMON
                                      CAPITAL                              BROTHERS          ELITE VALUE
                                     EMERGING           BLACKROCK       U.S. GOVERNMENT         ASSET
                                      GROWTH          MANAGED BOND        SECURITIES          ALLOCATION
                                     PORTFOLIO          PORTFOLIO          PORTFOLIO          PORTFOLIO
                                  ---------------    ---------------    ---------------    ----------------
<S>                               <C>                <C>                <C>                <C>
Standard benefit units:
  Outstanding at beginning of
     year.......................       107,870.9         14,436.2           15,638.1            69,575.7
  Increase for payments
     received...................        61,310.8         23,328.7            8,598.5            84,615.1
  Decrease for surrendered
     contracts..................        (4,703.4)        (2,641.1)            (674.1)           (8,707.2)
  Decrease for death claims.....        (1,147.7)              --                 --                  --
  Change for net interfund
     exchanges..................       139,680.6        (35,123.8)         103,270.0           316,446.5
                                   -------------       ----------         ----------          ----------
  Outstanding at end of
     period.....................       303,011.2               --          126,832.5           461,930.1
                                   =============       ==========         ==========          ==========
Enhanced benefit units:
  Outstanding at beginning of
     year.......................         2,072.6         11,399.4           11,806.1            13,965.2
  Increase for payments
     received...................         2,711.6               --                 --               272.4
  Decrease for surrendered
     contracts..................            (5.8)          (933.2)          (3,245.5)           (3,424.9)
  Decrease for death claims.....              --               --                 --                  --
  Change for net interfund
     exchanges..................        36,382.5        (10,466.2)          23,644.6            61,292.1
                                   -------------       ----------         ----------          ----------
  Outstanding at end of
     period.....................        41,160.9               --           32,205.2            72,104.8
                                   =============       ==========         ==========          ==========
</TABLE>
 
                                      F-15
<PAGE>   68
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     For the year ended December 31, 1996:
 
<TABLE>
<CAPTION>
                                         GLOBAL ADVISORS   GLOBAL ADVISORS   BEA GROWTH    CREDIT SUISSE
                                          MONEY MARKET      GROWTH EQUITY    AND INCOME    INTERNATIONAL
                                            PORTFOLIO         PORTFOLIO      PORTFOLIO    EQUITY PORTFOLIO
                                         ---------------   ---------------   ----------   ----------------
<S>                                      <C>               <C>               <C>          <C>
Standard benefit units:
  Outstanding at beginning of year.....       2,464.4            124.2           461.8           430.6
  Increase for payments received.......     500,186.2          5,781.3         4,927.3           978.8
  Decrease for surrendered contracts...        (386.1)          (193.0)         (308.2)         (497.1)
  Change for net interfund exchanges...    (392,426.6)        62,442.4        43,553.4        16,273.9
                                           ----------         --------        --------        --------
  Outstanding at end of period.........     109,837.9         68,154.9        48,634.3        17,186.2
                                           ==========         ========        ========        ========
Enhanced benefit units:
  Outstanding at beginning of year.....          24.9               --              --              --
  Increase for payments received.......      71,973.9              3.6           933.4           108.1
  Decrease for surrendered contracts...            --               --            (2.5)         (629.8)
  Change for net interfund exchanges...     (68,595.1)         5,229.1        10,778.9         9,031.9
                                           ----------         --------        --------        --------
  Outstanding at end of period.........       3,403.7          5,232.7        11,709.8         8,510.2
                                           ==========         ========        ========        ========
</TABLE>
 
<TABLE>
<CAPTION>
                                         VAN KAMPEN
                                          AMERICAN
                                          CAPITAL                      SALOMON BROTHERS
                                          EMERGING      BLACKROCK      U.S. GOVERNMENT      ELITE VALUE
                                           GROWTH      MANAGED BOND       SECURITIES      ASSET ALLOCATION
                                         PORTFOLIO      PORTFOLIO         PORTFOLIO          PORTFOLIO
                                         ----------   --------------   ----------------   ----------------
<S>                                      <C>          <C>              <C>                <C>
Standard benefit units:
  Outstanding at beginning of year.....         --             --                --                 --
  Increase for payments received.......   10,902.4          154.5                --            2,570.1
  Decrease for surrendered contracts...     (387.3)         (94.3)           (155.7)            (357.2)
  Change for net interfund exchanges...   97,355.8       14,376.0          15,793.8           67,362.8
                                         ---------       --------          --------           --------
  Outstanding at end of period.........  107,870.9       14,436.2          15,638.1           69,575.7
                                         =========       ========          ========           ========
Enhanced benefit units:
  Outstanding at beginning of year.....         --             --                --                 --
  Increase for payments received.......         --           41.6              41.4              237.0
  Decrease for surrendered contracts...         --             --            (855.9)            (769.0)
  Change for net interfund exchanges...    2,072.6       11,357.8          12,620.6           14,497.2
                                         ---------       --------          --------           --------
  Outstanding at end of period.........    2,072.6       11,399.4          11,806.1           13,965.2
                                         =========       ========          ========           ========
</TABLE>
 
6. DISTRIBUTION AGREEMENT
 
     AGA Brokerage Services, Inc. ("AGA Brokerage"), formerly WNL Brokerage
Services, Inc., a wholly owned subsidiary of WNL Holding Corp., acts as the
principal underwriter of the contracts funded by the Separate Account. AGA
Brokerage is registered as a broker-dealer under the Securities Exchange Act of
1934 and is a member of the National Association of Securities Dealers, Inc. The
contracts are sold by registered representatives of the Company, who are also
insurance agents under state law.
 
7. RELATED PARTIES
 
     Total capital contributed by the Company to the Separate Account was
$9,600,000 as of December 31, 1997. The capital was contributed to provide
diversification and to enhance investment performance. The capital will be
removed as the funds grow large enough to meet the diversification requirements
without the
 
                                      F-16
<PAGE>   69
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                             AGA SEPARATE ACCOUNT A
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
additional capital. During 1997, the Company received a capital distribution
from the Separate Account of $3,400,169 due to the elimination of the BlackRock
Managed Bond Portfolio as one of the available investment options to contract
owners. Dividends, realized gain distributions, and unrealized gains related to
the contributed capital as of and for the year ended were $517,091, $573,091,
and $2,149,932, respectively.
 
8. SUBSEQUENT EVENT
 
     On February 25, 1998, the Company's parent, Western National Corporation,
was acquired by American General Corporation.
 
                                      F-17
<PAGE>   70
 
                              FINANCIAL STATEMENTS
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
                     YEARS ENDED DECEMBER 31, 1997 AND 1996
<PAGE>   71
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                               PAGE
                                                               ----
<S>                                                            <C>
Reports of Independent Auditors.............................    F-2
Balance Sheet as of December 31, 1997 and 1996..............    F-4
Statement of Operations for the years ended December 31,
  1997, 1996 and 1995.......................................    F-5
Statement of Shareholder's Equity for the years ended
  December 31, 1997, 1996 and 1995..........................    F-6
Statement of Cash Flows for the years ended December 31,
  1997, 1996 and 1995.......................................    F-7
Notes to Financial Statements...............................    F-8
Report of Independent Auditors on Financial Statement
  Schedule..................................................   F-29
Financial Statement Schedule:
  Schedule VI -- Reinsurance for the years ended December
     31, 1997, 1996 and 1995................................   F-30
</TABLE>
 
                                       F-1
<PAGE>   72
 
                         REPORT OF INDEPENDENT AUDITORS
 
To the Board of Directors of
American General Annuity Insurance Company
 
     We have audited the accompanying balance sheet of American General Annuity
Insurance Company (formerly known as Western National Life Insurance Company) as
of December 31, 1997, and the related statements of Operations, shareholders
equity, and cash flows for the year ended December 31, 1997. Our audit also
included the financial statement schedule listed in the Index on page F-1 of
this Form N-4. These financial statements and schedule are the responsibility of
the Company's management. Our responsibility is to express an opinion on these
financial statements and schedules based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards and 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 audit provides a reasonable basis for our
opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of American General Annuity
Insurance Company at December 31, 1997, and the consolidated results of its
operations and its cash flows for the year ended December 31, 1997, in
conformity with generally accepted accounting principles. Also, in our opinion,
the related financial statement schedule, when considered in relation to the
basic financial statements taken as a whole, presents fairly in all material
respects the information set forth therein.
 
                                            ERNST & YOUNG LLP
 
Houston, Texas
May 12, 1998
 
                                       F-2
<PAGE>   73
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors of
American General Annuity Insurance Company
 
     We have audited the accompanying balance sheet of American General Annuity
Insurance Company, formerly known as Western National Life Insurance Company, as
of December 31, 1996, and the related statements of operations, shareholder's
equity, and cash flows for each of the two years in the period ended December
31, 1996. These financial statements are the responsibility of the Company'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. 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, the financial statements referred to above present fairly,
in all material respects, the financial position of American General Annuity
Insurance Company as of December 31, 1996, and the results of its operations and
its cash flows for each of the two years in the period ended December 31, 1996,
in conformity with generally accepted accounting principles.
 
                                            COOPERS & LYBRAND L.L.P.
 
Houston, Texas
February 5, 1997
 
                                       F-3
<PAGE>   74
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
 
                                 BALANCE SHEET
                           DECEMBER 31, 1997 AND 1996
                             (DOLLARS IN MILLIONS)
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                1997        1996
                                                              ---------   ---------
<S>                                                           <C>         <C>
Investments:
  Fixed maturities actively managed at fair value (amortized
     cost: 1997 -- $9,635.1; 1996 -- $8,738.4)..............  $ 9,989.2   $ 8,842.5
  Equity securities at fair value (cost: 1997 -- $10.1;
     1996 -- $0.0)..........................................       10.4          --
  Mortgage loans............................................      102.5       122.7
  Credit-tenant loans.......................................      217.0       208.5
  Policy loans..............................................       61.8        66.8
  Other invested assets.....................................       33.4        24.5
  Receivable for securities.................................        3.4         0.4
  Short-term investments....................................      475.6       105.4
                                                              ---------   ---------
          Total investments.................................   10,893.3     9,370.8
Accrued investment income...................................      161.7       156.6
Funds held by reinsurer and reinsurance receivables.........      220.8        98.0
Cost of policies purchased..................................        7.7        50.4
Cost of policies produced...................................      418.0       380.2
Current income taxes........................................        8.2          --
Other assets................................................       13.8         9.7
Separate account assets.....................................       29.6         6.0
                                                              ---------   ---------
          Total assets......................................  $11,753.1   $10,071.7
                                                              =========   =========
                       LIABILITIES AND SHAREHOLDER'S EQUITY
Liabilities:
  Insurance liabilities.....................................  $ 9,801.0   $ 8,679.9
  Investment borrowings and payable for securities..........      434.6       156.3
  Deferred income taxes.....................................      153.8        96.4
  Other liabilities.........................................       23.2        38.1
  Separate account liability................................       29.6         6.0
                                                              ---------   ---------
          Total liabilities.................................   10,442.2     8,976.7
                                                              ---------   ---------
Shareholder's equity:
  Common stock and additional paid-in capital (par value $50
     per share; 100,000 shares authorized; 50,000 issued and
     outstanding)...........................................      458.5       448.5
  Unrealized appreciation of investments, net...............      129.9        39.1
  Retained earnings.........................................      722.5       607.4
                                                              ---------   ---------
          Total shareholder's equity........................    1,310.9     1,095.0
                                                              ---------   ---------
          Total liabilities and shareholder's equity........  $11,753.1   $10,071.7
                                                              =========   =========
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
 
                                       F-4
<PAGE>   75
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
 
                            STATEMENT OF OPERATIONS
              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                               1997     1996     1995
                                                              ------   ------   -------
<S>                                                           <C>      <C>      <C>
Revenues:
  Insurance policy income...................................  $126.9   $ 91.0   $  26.4
  Net investment income.....................................   807.0    703.1     662.2
  Equity in earnings of partnerships investments............     0.3      7.0       3.8
  Net realized losses.......................................   (22.7)    (2.3)   (126.2)
                                                              ------   ------   -------
          Total revenues....................................   911.5    798.8     566.2
                                                              ------   ------   -------
Benefits and expenses:
  Insurance policy benefits.................................   108.8    109.6     108.3
  Change in future policy benefits and other liabilities....   114.2     74.6      14.1
  Interest expense on annuities and financial products......   425.9    381.7     364.9
  Interest expense on investment borrowing..................    17.8      8.1       8.6
  Amortization related to operations........................    48.3     41.6      37.1
  Amortization and change in future policy benefits related
     to realized gains (losses).............................    (4.0)     0.6     (29.8)
  Other operating costs and expenses........................    20.3     13.5      41.3
                                                              ------   ------   -------
          Total benefits and expenses.......................   731.3    629.7     544.5
                                                              ------   ------   -------
          Income before income taxes........................   180.2    169.1      21.7
Income tax expense..........................................    64.9     59.1       6.3
                                                              ------   ------   -------
Net income..................................................  $115.3   $110.0   $  15.4
                                                              ======   ======   =======
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
 
                                       F-5
<PAGE>   76
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
 
                       STATEMENT OF SHAREHOLDER'S EQUITY
              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                1997       1996      1995
                                                              --------   --------   -------
<S>                                                           <C>        <C>        <C>
Common stock and additional paid-in capital:
  Balance, beginning of year................................  $  448.5   $  322.6   $ 322.6
     Capital contribution...................................      10.0      125.9        --
                                                              --------   --------   -------
  Balance, end of year......................................     458.5      448.5   $ 322.6
                                                              ========   ========   =======
Unrealized appreciation (depreciation) of investments, net:
  Balance, beginning of year................................  $   39.1   $  125.2   $(322.1)
     Change in unrealized appreciation (depreciation),
       net..................................................      90.8      (86.1)    447.3
                                                              --------   --------   -------
     Balance, end of year...................................  $  129.9   $   39.1   $ 125.2
                                                              ========   ========   =======
Retained earnings:
  Balance, beginning of year................................  $  607.4   $  496.9   $ 481.5
     Beginning balance for WNL Investment Advisory Services,
       Inc..................................................        --        0.5        --
     Other..................................................      (0.2)        --        --
     Net income.............................................     115.3      110.0      15.4
                                                              --------   --------   -------
  Balance, end of year......................................  $  722.5   $  607.4   $ 496.9
                                                              ========   ========   =======
          Total shareholder's equity........................  $1,310.9   $1,095.0   $ 944.7
                                                              ========   ========   =======
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
 
                                       F-6
<PAGE>   77
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
 
                            STATEMENT OF CASH FLOWS
              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                1997        1996        1995
                                                              ---------   ---------   ---------
<S>                                                           <C>         <C>         <C>
Cash flows from operating activities:
  Net income................................................  $   115.3   $   110.0   $    15.4
  Adjustments to reconcile net income to net cash provided
     by operating activities:
     Amortization and depreciation..........................       44.9        42.6         7.3
     Realized (gains) losses on investments, net............       16.2        (2.6)      119.4
     Income taxes...........................................      (11.6)       50.4        60.7
     Increase in insurance liabilities......................       57.3         8.2       116.0
     Interest credited to insurance liabilities.............      438.4       391.8       370.2
     Fees charged to insurance liabilities..................       (6.9)       (4.4)       (4.2)
     Amortization (accrual) of investment income, net.......      (10.5)      (27.3)        3.7
     Deferral of cost of policies produced..................     (147.6)     (120.7)      (62.2)
     Other..................................................      (15.1)       (9.3)       (0.4)
                                                              ---------   ---------   ---------
          Net cash provided by operating activities.........      480.4       438.7       625.9
                                                              ---------   ---------   ---------
Cash flows from investing activities:
  Sales of investments......................................    3,091.0     3,086.8     3,151.9
  Maturities and redemptions of investments.................      581.2       431.0       376.3
  Purchases of investments..................................   (4,593.1)   (4,571.8)   (3,686.4)
                                                              ---------   ---------   ---------
          Net cash used in investing activities.............     (920.9)   (1,054.0)     (158.2)
                                                              ---------   ---------   ---------
Cash flows from financing activities:
  Deposits to insurance liabilities.........................    1,949.6     1,711.3       747.2
  Withdrawals from insurance liabilities....................   (1,440.0)   (1,402.7)   (1,052.5)
  Capital contributions from parent.........................       10.0       125.9          --
  Advances to affiliates....................................        6.0          --          --
  Investment borrowings, net................................      285.1      (128.6)      226.6
                                                              ---------   ---------   ---------
          Net cash provided by (used in) financing
            activities......................................      810.7       305.9       (78.7)
                                                              ---------   ---------   ---------
          Net increase (decrease) in short-term
            investments.....................................      370.2      (309.4)      389.0
Short-term investments beginning of year....................      105.4       414.8        25.8
                                                              ---------   ---------   ---------
Short-term investments end of year..........................  $   475.6   $   105.4   $   414.8
                                                              =========   =========   =========
Supplemental cash flow disclosure:
  Income taxes (refunded) paid, net.........................  $    75.1   $   (25.4)  $    (4.7)
                                                              =========   =========   =========
  Interest paid on investment borrowings....................  $    17.8   $     8.4   $     8.0
                                                              =========   =========   =========
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
 
                                       F-7
<PAGE>   78
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                         NOTES TO FINANCIAL STATEMENTS
 
1. SIGNIFICANT ACCOUNTING POLICIES:
 
  Organization, Nature of Operations and Basis of Presentation
 
     American General Annuity Insurance Company (the "Company") is a State of
Texas domiciled life insurance company that was founded in 1944. The Company is
a wholly-owned subsidiary of Western National Corporation ("Western National").
In February 1994, Conseco, Inc. ("Conseco") transferred ownership of the Company
to Western National, an insurance holding company formed by Conseco. The
transactions were approved by the Texas Department of Insurance. Western
National completed an initial public offering of its common stock in February
1994 whereby Conseco retained approximately 40% ownership of Western National's
common stock. On December 23, 1994, AGC Life Insurance Company ("AGC Life"), a
Missouri-domiciled life insurer, purchased the remaining shares of common stock
held by Conseco. AGC Life is a wholly-owned subsidiary of American General
Corporation, a Texas corporation ("AGC"). References to "American General" are
references to AGC and its direct and indirect majority controlled subsidiaries.
As of December 31, 1996, American General owned approximately a 46% equity
interest in Western National. The increase in American General's equity interest
was the result of Western National issuing preferred stock to American General
in September 1996. On February 25, 1998, with the approval of the Texas
Department of Insurance and the shareholders of Western National, American
General acquired the remaining 54% of the outstanding common stock of Western
National for consideration valued at approximately $1.2 billion. The financial
statements are presented on an historical basis of accounting and do not reflect
any of the push down of purchase accounting adjustments that will occur upon the
acquisition.
 
     WNL Investment Advisory Services, Inc. ("WNLIAS") was formed primarily to
manage the Company's investment portfolio and to own certain investments of the
Company. On March 27, 1998, WNLIAS changed its name to AGA Investment Advisory
Services, Inc ("AGAIAS"). AGAIAS is an investment subsidiary as defined by the
National Association of Insurance Commissioners. The Company and AGAIAS are
subsidiaries of Western National and are under common management control. The
accompanying financial statements include the accounts of WNLIAS as of and for
the years ended December 31, 1997 and 1996. The Company's investment in WNLIAS
preferred stock, intercompany investment advisory fees, and other intercompany
accounts have been eliminated.
 
     The Company develops, markets and issues annuity products through niche
distribution channels. The Company sells deferred annuities, including its
proprietary fixed annuities, to the savings and retirement markets through
financial institutions (primarily banks and thrifts), and sells deferred
annuities to both tax-qualified and nonqualified retirement markets through
personal producing general agents ("PPGAs"). The Company also sells deferred
annuities through its direct sales operations. Under a joint marketing
arrangement with American General Life Insurance Company ("AGLIC"), the Company
markets and coinsures single premium immediate annuities ("SPIAs") through
specialty brokers to the structured settlement market. The Company also sells
SPIAs (other than structured settlement SPIAs) through its financial institution
and PPGA distribution channels. The Company commenced sales of its first
variable annuity product in fourth quarter 1995. Sales of deferred annuities
through financial institutions comprised 81%, 82% and 68% of net premiums
collected in 1997, 1996 and 1995, respectively. Sales through a single financial
institution comprised 40% of net premiums collected in 1997.
 
  Overall Effect of Estimates
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities, the
disclosure of contingent assets and liabilities at the date of the financial
statements, and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
                                       F-8
<PAGE>   79
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
  Investments
 
     Fixed maturity investments ("fixed maturities") are debt securities that
have original maturities greater than one year and are comprised of investments
such as U.S. Treasury securities, mortgage-backed securities, corporate bonds,
asset-backed securities and redeemable preferred stocks. Equity securities
include common and non-redeemable preferred stocks. The Company follows the
provisions of Statement of Financial Accounting Standards No. 115, ACCOUNTING
FOR CERTAIN INVESTMENTS IN DEBT AND EQUITY SECURITIES ("SFAS 115"), and,
accordingly, classifies its fixed maturities and equity securities into the
following categories:
 
     - Actively managed fixed maturities and equity securities are securities
       that may be sold prior to maturity due to changes that might occur in
       market interest rates, changes in prepayment risk, the Company's
       management of its income tax position, general liquidity needs, increase
       in loan demand, the need to increase regulatory capital or similar
       factors. Actively managed securities are carried at estimated fair value
       and the net unrealized gains (losses) are recorded as a component of
       shareholder's equity, net of tax and related adjustments described below.
       All of the Company's fixed maturities and equity securities were
       classified as actively managed as of December 31, 1997 and 1996.
 
     - Held to maturity securities are those debt securities which the Company
       has the ability and positive intent to hold to maturity, and are carried
       at amortized cost. The Company may dispose of such securities under
       certain unforeseen circumstances, such as issuer credit deterioration or
       changes in regulatory requirements. The Company had no held to maturity
       securities in 1997 and 1996.
 
     - Trading account securities are fixed maturity and equity securities that
       are bought and held primarily for the purpose of selling them in the near
       term. Trading account securities are carried at estimated fair value and
       the net unrealized gains (losses) are included as a component of net
       trading income. The Company had no trading account activities in 1997 or
       1996.
 
     Changes in interest rates have a direct, inverse impact on the market value
of fixed-income investments. It is reasonably possible that changes in interest
rates will occur in the near term and, as a result of SFAS 115, such changes
will have a material impact on the carrying value of actively managed fixed
maturity and equity securities, with an offsetting effect to stockholder's
equity, net of the related effects on cost of policies purchased and produced
and deferred income taxes.
 
     Anticipated returns, including realized gains and losses, from the
investment of policyholder balances are considered in determining the
amortization of the cost of policies purchased and the cost of policies
produced. When actively managed fixed maturity and equity securities are stated
at fair value, an adjustment is made to the cost of policies purchased and the
cost of policies produced equal to the change in amortization that would have
been recorded if such securities had been sold at their fair value and the
proceeds reinvested at current yields. Furthermore, if future yields expected to
be earned on such securities decline, it may be necessary to increase certain
insurance liabilities. Adjustments to such liabilities are required when their
balances, in addition to future net cash flows including investment income, are
insufficient to cover future benefits and expenses.
 
     Mortgage loans and credit-tenant loans are carried at amortized cost.
Policy loans are carried at their current unpaid principal balance. Fees
received and costs incurred in connection with the Company's origination of
these loans are deferred and amortized as yield adjustments over the loan's
remaining contractual lives in accordance with SFAS 91. Short-term investments,
which principally include commercial paper, cash and other financial instruments
with original maturities of 90 days or less, are carried at amortized cost.
 
                                       F-9
<PAGE>   80
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Discounts and premiums of investment securities to par are amortized as
yield adjustments over the contractual lives of the underlying securities and
callable corporate bonds. Principal prepayments can alter the cash flow pattern
and yield of prepayment-sensitive investments such as mortgage-backed securities
("MBS") and callable bonds. The accretion of discount and amortization of
premium takes into consideration actual and estimated principal prepayments. In
the case of MBS, the Company utilizes estimated prepayment speed information
obtained from published sources or from estimates developed internally. The
effects on the yield of a security from changes in principal prepayments are
recognized retrospectively, except for interest only or residual interests in
structured securities which are recognized prospectively. The degree to which a
security is susceptible to yield adjustments is influenced by the difference
between its carrying value and par, the relative sensitivity of the underlying
assets backing the securities to changing interest rates, and the repayment
priority of the securities in the overall securitization structure. Prepayments
may also reduce future yield to the extent that proceeds are reinvested in a
lower rate environment.
 
     The Company manages the extent of these risks by (i) principally purchasing
securities which are backed by collateral with lower prepayment sensitivity
(such as MBS priced at or near par value that are highly seasoned), (ii)
avoiding securities with values heavily influenced by changes in prepayments
(such as interest-only and principal-only securities), and (iii) purchasing
securities with prepayment protected structures.
 
     The specific identification method is used to account for the disposition
of investments. The differences between the sales proceeds and the carrying
values are reported as gains (losses), or in the case of prepayments, as
adjustments to investment income. Declines in values of investments which are
considered other than temporary are recognized as realized losses. Subsequent
recoveries in value are recognized only when the investments are sold.
 
     The Company occasionally uses derivative financial instruments to alter
interest rate exposure arising from mismatches between assets and liabilities.
Certain of the Company's fixed maturity investments are floating-rate
instruments. In an effort to reasonably closely match the average duration of
assets and liabilities, the Company has entered into interest rate swap
contracts that effectively convert the floating-rate securities to fixed-rate
instruments. Specifically, the Company contracts with counterparties to
exchange, at specified intervals, the difference between fixed-rate and
floating-rate interest amounts calculated by reference to an agreed notional
amount. The Company pays the floating rate and receives the fixed rate, with the
net difference charged or credited as an adjustment to investment income. The
Company's investment guidelines provide that all swap contracts must be either
(i) with parties rated "A" or better by a nationally recognized statistical
rating service, and/or (ii) secured by collateral approved by the Company's
Investment Committee.
 
     The Company occasionally enters into mortgage dollar roll and reverse
repurchase transactions (collectively, "dollar rolls") when earnings enhancement
opportunities arise. Dollar rolls are agreements with an outside source, usually
broker/dealers, to sell mortgage-backed securities and then, at a predetermined
date, to buy back "substantially the same securities". The securities "rolled"
are agency pass-throughs [i.e., have been issued, assumed or guaranteed by the
Government National Mortgage Association ("GNMA"), the Federal National Mortgage
Association ("FNMA"), or the Federal Home Loan Mortgage Corporation ("FHLMC")].
 
     The Company enters into dollar rolls whenever a positive spread can be
realized from the implicit interest cost of the investment borrowings and the
reinvestment of the proceeds in short-term financial instruments. Because both
sides of the transaction are entered into on the basis of short-term,
money-market rates, dollar rolls involve relatively little duration risk while
providing an enhancement to investment income. The Company's dollar rolls are
accounted for as short-term investment borrowings.
 
     Other invested assets include investments in limited partnerships. The
Company follows the equity method of accounting for these investments. Limited
partnerships investments are likely to result in a higher
 
                                      F-10
<PAGE>   81
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
degree of volatility in reported earnings than is typically the case with fixed
income investments, and present a greater risk of loss, as they reflect claims
on an issuer's capital structure junior to that of most fixed-income
investments.
 
  Cost of Policies Purchased
 
     The cost of policies purchased represents the portion of Conseco's cost of
acquiring the Company in 1987 that was attributable to the value of the right to
receive future cash flows from insurance contracts existing at the date of
acquisition. The value of the cost of policies purchased is the actuarially
determined present value of the projected future cash flows from the acquired
policies.
 
     Expected future cash flows used in determining the cost of policies
purchased are based on actuarially determined projections of future premium
collection, mortality, surrenders, benefit payments, operating expenses, changes
in insurance liabilities, investment yields on the assets held to back such
policy liabilities and other factors. These projections take into account all
factors known or expected at the valuation date based on the collective judgment
of the management of the Company. Actual experience on purchased business may
vary from projections due to differences in renewal premiums collected,
investment spread, investment gains (losses), mortality and morbidity costs and
other factors. These variances from original projections, whether positive or
negative, are included in net income as they occur. To the extent that these
variances indicate that future cash flows will differ from those reflected in
the scheduled amortization of the cost of policies purchased, current and future
amortization is adjusted. Therefore, when the Company sells fixed maturities and
recognizes a gain (loss) it also reduces (increases) the future investment
spread because the proceeds from the sale of investments are reinvested at a
lower (higher) earnings rate and amortization is increased (decreased) to
reflect the change in the incidence of cash flows. The discount rate used to
determine such value is the current rate of return the Company would require to
justify the investment.
 
     The cost of policies purchased is amortized (with interest at the same rate
used to determine the discounted value of the asset) based on the incidence of
the expected cash flows. Recoverability of the cost of policies purchased is
evaluated regularly by comparing the current estimate of expected future cash
flows (discounted at the rate of interest that accrues to the policies) to the
unamortized asset balance by line of insurance business. If such current
estimate indicates that the existing insurance liabilities, together with the
present value of future net cash flows from the business, will not be sufficient
to recover the cost of policies purchased, the difference is charged to expense.
Amortization is also adjusted for the current and future years to reflect (i)
the revised estimate of future cash flows and (ii) the revised interest rate
(but not greater than the rate initially used and not lower than the rate of
interest earned on invested assets) at which the discounted present value of
such expected future profits equals the unamortized asset balance. Expected
future cash flows used in determining the amortization pattern and
recoverability of cost of policies purchased is based on historical gross
profits and management's estimates and assumptions regarding future investment
spreads, maintenance expenses, and persistency of the block of business. The
accuracy of the estimates and assumptions are impacted by several factors,
including factors outside the control of management such as movements in
interest rates and competition from other investment alternatives. It is
reasonably possible that conditions impacting the estimates and assumptions will
change and that such changes will result in future adjustments to cost of
policies purchased.
 
                                      F-11
<PAGE>   82
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
  Cost of Policies Produced
 
     Costs of producing new business (primarily commissions and certain costs of
policy issuance and underwriting) which vary with and are primarily related to
the production of new business, are deferred to the extent recoverable from
future profits. Such costs are amortized with interest as follows:
 
     - For universal life-type contracts and investment-type contracts, in
       relation to the present value of expected gross profits from these
       contracts, discounted using the interest rate credited to the policy;
 
     - For immediate annuities with mortality risks, in relation to the present
       value of benefits to be paid;
 
     - For traditional life contracts, in relation to future anticipated premium
       revenue using the same assumptions that are used in calculating the
       insurance liabilities.
 
     Recoverability of the unamortized balance of the cost of policies produced
is evaluated regularly. For universal life-type contracts and investment-type
contracts, the accumulated amortization is adjusted (whether an increase or a
decrease) whenever there is a material change in the estimated gross profits
expected over the life of a block of business in order to maintain a constant
relationship between cumulative amortization and the present value (discounted
at the rate of interest that accrues to the policies) of expected gross profits.
For most other contracts, the unamortized asset balance is reduced by a charge
to income only when the sum of the present value of future cash flows and the
policy liabilities is not sufficient to cover such asset balance. Expected gross
profits used in determining the amortization pattern and recoverability of cost
of policies produced is based on historical gross profits and management's
estimates and assumptions regarding future investment spreads, maintenance
expenses, and persistency of the block of business. The accuracy of the
estimates and assumptions are impacted by several factors, including factors
outside the control of management such as movements in interest rates and
competition from other investment alternatives. It is reasonably possible that
conditions impacting the estimates and assumptions will change and that such
changes will result in future adjustments to cost of policies produced.
 
  Insurance Liabilities, Recognition of Insurance Policy Income and Related
Benefits and Expenses
 
     Reserves for universal life-type and investment-type contracts are based on
the contract account balance, if future benefit payments in excess of the
account balance are not guaranteed, or on the present value of future benefit
payments when such payments are guaranteed. Additional increases to insurance
liabilities are made, or deferred acquisition costs are written off, if future
cash flows, including investment income, are insufficient to cover future
benefits and expenses.
 
     For investment contracts without mortality risk (such as deferred annuities
and immediate annuities with benefits paid for a period certain) and for
contracts that permit the Company or the insured to make changes in the contract
terms (such as single premium whole life and universal life), premium deposits
and benefit payments are recorded as increases or decreases in a liability
account rather than as revenue and expense. Amounts charged against the
liability account for the cost of insurance, policy administration and surrender
penalties are recorded as revenues. Interest credited to the liability account
and benefit payments made in excess of the contract liability account balance
are charged to expense.
 
     Reserves for traditional and limited-payment contracts are generally
calculated using the net level premium method and assumptions as to investment
yields, mortality, withdrawals and dividends. The assumptions are based on
projections of past experience and include provisions for possible adverse
deviation. These assumptions are made at the time the contract is issued or, in
the case of contracts acquired by purchase, at the purchase date.
 
                                      F-12
<PAGE>   83
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     For traditional insurance contracts, premiums are recognized as income when
due. Benefits and expenses are associated with earned premiums so as to result
in their recognition over the premium-paying period of the contracts. Such
recognition is accomplished through the provision for future policy benefits and
the amortization of deferred policy acquisition costs.
 
     For contracts with mortality risk, but with premiums paid for only a
limited period (such as single premium immediate annuities with benefits paid
for the life of the annuitant), the accounting treatment is similar to
traditional contracts. However, the excess of the gross premium over the net
premium is deferred and recognized in relation to the present value of expected
future benefit payments.
 
     Liabilities for incurred claims are determined using historical experience
and represent an estimate of the present value of the ultimate net cost of all
reported and unreported claims. Management believes these estimates are
adequate. Such estimates are periodically reviewed and any adjustments are
reflected in current operations.
 
  Income Taxes
 
     Pursuant to a tax sharing agreement, the Company was included in Conseco's
consolidated tax return beginning January 1, 1993. Under the agreements, income
taxes were allocated based upon separate return calculations with certain
adjustments. Commencing with the income tax reporting period ended December 31,
1994, the Company has filed separate life insurance company tax returns. WNLIAS
is included in the consolidated tax return of Western National. Income taxes are
allocated to WNLIAS on a separate return basis.
 
     Deferred income taxes are provided for the future tax effects of temporary
differences between the tax bases of assets and liabilities and their financial
reporting amounts, measured using the enacted tax rates and laws that will be in
effect when the differences are expected to reverse. The Company provides a
valuation allowance, if necessary, to reduce deferred tax assets, if any, to
their estimated realizable value.
 
2. INVESTMENTS:
 
     The amortized cost, gross unrealized gains and losses, estimated fair value
and carrying value of actively managed and held to maturity fixed maturities
were as follows:
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31, 1997
                                                   --------------------------------------------------
                                                                  GROSS         GROSS       ESTIMATED
                                                   AMORTIZED    UNREALIZED    UNREALIZED      FAIR
                                                     COST         GAINS         LOSSES        VALUE
                                                   ---------    ----------    ----------    ---------
                                                                 (DOLLARS IN MILLIONS)
<S>                                                <C>          <C>           <C>           <C>
Actively managed:
  U.S. Treasury securities and obligations of
     U.S. government corporations and agencies...  $  130.1       $  1.0        $   --      $  131.1
  Obligations of states and political
     subdivisions................................     185.7          9.4          (5.3)        189.8
  Public utility securities......................   1,015.2         37.3         (14.6)      1,037.9
  Other corporate securities.....................   5,030.8        258.3         (32.9)      5,256.2
  Asset-backed securities........................     479.6         19.0          (0.9)        497.7
  Mortgage-backed securities.....................   2,793.7         88.4          (5.6)      2,876.5
                                                   --------       ------        ------      --------
          Total actively managed.................  $9,635.1       $413.4        $(59.3)     $9,989.2
                                                   ========       ======        ======      ========
</TABLE>
 
                                      F-13
<PAGE>   84
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31, 1996
                                                   --------------------------------------------------
                                                                  GROSS         GROSS       ESTIMATED
                                                   AMORTIZED    UNREALIZED    UNREALIZED      FAIR
                                                     COST         GAINS         LOSSES        VALUE
                                                   ---------    ----------    ----------    ---------
                                                                 (DOLLARS IN MILLIONS)
<S>                                                <C>          <C>           <C>           <C>
Actively managed:
  U.S. Treasury securities and obligations of
     U.S. government corporations and agencies...  $   20.8       $  0.6        $   --      $   21.4
  Obligations of states and political
     subdivisions................................     224.1          2.6          (4.7)        222.0
  Public utility securities......................   1,251.6         21.0         (30.4)      1,242.2
  Other corporate securities.....................   4,583.6        140.0         (36.2)      4,687.4
  Asset-backed securities........................     349.3          5.2          (2.6)        351.9
  Mortgage-backed securities.....................   2,309.0         28.4         (19.8)      2,317.6
                                                   --------       ------        ------      --------
          Total actively managed.................  $8,738.4       $197.8        $(93.7)     $8,842.5
                                                   ========       ======        ======      ========
</TABLE>
 
     The following table sets forth the amortized cost and estimated fair value
of fixed maturities as of December 31, 1997, based upon the source of the
estimated fair value:
 
<TABLE>
<CAPTION>
                                                                          ESTIMATED
                                                              AMORTIZED     FAIR
                                                                COST        VALUE
                                                              ---------   ---------
                                                              (DOLLARS IN MILLIONS)
<S>                                                           <C>         <C>
Nationally recognized pricing services......................  $8,335.3    $8,663.1
Broker-dealer market makers.................................     757.4       782.9
Internally developed methods................................     542.4       543.2
                                                              --------    --------
          Total fixed maturities............................  $9,635.1    $9,989.2
                                                              ========    ========
</TABLE>
 
     The following table sets forth the quality of total fixed maturities as of
December 31, 1997, classified in accordance with the highest rating by a
nationally recognized statistical rating organization or, as to $220.3 million
of fixed maturities not commercially rated, then based on ratings assigned by
the NAIC as follows (for purposes of the table, and only for fixed maturities
not commercially rated: NAIC Class 1
 
                                      F-14
<PAGE>   85
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
securities would be included in the "A" rating; Class 2, "BBBC"; Class 3, "BBC";
and Classes 4-6, "B" and below):
 
<TABLE>
<CAPTION>
                                                                               FAIR VALUE
                                                                               ----------
                                                                  AS A % OF    AS A % OF     AS A % OF
                                           AMORTIZED     FAIR       FIXED      AMORTIZED       TOTAL
           COMMERCIAL RATING                 COST       VALUE     MATURITIES      COST      INVESTMENTS
           -----------------               ---------   --------   ----------   ----------   -----------
                                                              (DOLLARS IN MILLIONS)
<S>                                        <C>         <C>        <C>          <C>          <C>
A.......................................   $3,075.4    $3,163.4      31.7%      102.9%         29.0%
AA......................................      787.1       813.4       8.1        103.3          7.5
A.......................................    2,275.1     2,382.7      23.8        104.7         21.8
BBB+....................................      773.8       808.5       8.1        104.5          7.4
BBB.....................................    1,170.1     1,219.0      12.2        104.2         11.2
BBBC....................................      844.3       876.3       8.8        103.8          8.0
                                           --------    --------     -----        -----         ----
          Total investment grade........    8,925.8     9,263.3      92.7        103.8         84.9
                                           --------    --------     -----        -----         ----
BB+.....................................      229.2       231.4       2.3        101.0          2.1
BB......................................       93.6        96.9       1.0        103.5          0.9
BBC.....................................      130.7       137.1       1.4        104.9          1.3
B and below.............................      255.8       260.5       2.6        101.8          2.4
                                           --------    --------     -----        -----         ----
          Total below investment
            grade.......................      709.3       725.9       7.3        102.4          6.7
                                           --------    --------     -----        -----         ----
          Total fixed maturities........   $9,635.1    $9,989.2     100.0%       103.7%        91.6%
                                           ========    ========     =====        =====         ====
</TABLE>
 
     The amortized cost and estimated fair value of fixed maturities by
contractual maturity as of December 31, 1997 were as follows:
 
<TABLE>
<CAPTION>
                                                                          ESTIMATED
                                                              AMORTIZED     FAIR
                                                                COST        VALUE
                                                              ---------   ---------
                                                              (DOLLARS IN MILLIONS)
<S>                                                           <C>         <C>
Due in one year or less.....................................  $  143.4    $  148.2
Due after one year through five years.......................     673.5       690.4
Due after five years through ten years......................   2,547.9     2,619.1
Due after ten years.........................................   3,476.7     3,655.1
                                                              --------    --------
          Subtotal..........................................   6,841.5     7,112.8
Mortgage-backed securities..................................   2,793.6     2,876.4
                                                              --------    --------
          Total fixed maturities............................  $9,635.1    $9,989.2
                                                              ========    ========
</TABLE>
 
     Actual maturities will differ from contractual maturities because borrowers
may have the right to call or prepay obligations, with or without call or
prepayment penalties, and because most mortgage-backed securities provide for
periodic payments throughout their lives.
 
                                      F-15
<PAGE>   86
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Net investment income consisted of the following:
 
<TABLE>
<CAPTION>
                                                              1997     1996     1995
                                                             ------   ------   ------
                                                              (DOLLARS IN MILLIONS)
<S>                                                          <C>      <C>      <C>
Fixed maturities...........................................  $746.2   $656.8   $610.1
  Equity securities........................................     0.4      0.8      0.2
  Mortgage loans...........................................     7.9      9.7      9.4
  Credit-tenant loans......................................    17.7     19.8     23.9
  Policy loans.............................................     3.9      4.1      4.4
  Equity in earnings of partnership investment.............     0.3      7.0      3.8
  Other invested assets....................................    16.6      8.3      6.0
  Short-term investments...................................    18.6      6.8     12.8
                                                             ------   ------   ------
Gross investment income....................................   811.6    713.3    670.6
  Investment expenses......................................    (4.3)    (3.2)    (4.6)
                                                             ------   ------   ------
Net investment income and equity in earnings of partnership
  investments..............................................  $807.3   $710.1   $666.0
                                                             ======   ======   ======
</TABLE>
 
     The Company had no investments on nonaccrual status nor any fixed
maturities in default as to the payment of principal or interest at December 31,
1997 and 1996. No credit impairment write-downs were necessitated in 1997,
compared to $5.6 million in 1996 and $6.4 million in 1995.
 
     The proceeds from sales of actively managed fixed maturities were $3.1
billion, $3.1 billion, and $3.2 billion for the years ended December 31, 1997,
1996 and 1995, respectively.
 
     Net realized gains (losses) were as follows:
 
<TABLE>
<CAPTION>
                                                             1997     1996     1995
                                                            ------   ------   -------
                                                              (DOLLARS IN MILLIONS)
<S>                                                         <C>      <C>      <C>
Fixed maturities:
  Gross realized gains....................................  $ 29.9   $ 34.0   $  17.8
  Gross realized losses...................................   (47.5)   (25.6)   (128.6)
  Decline in net realizable value that is other than
     temporary............................................      --     (5.6)     (6.4)
                                                            ------   ------   -------
                                                             (17.6)     2.8    (117.2)
Equity securities.........................................      --       --       0.8
Mortgages loans...........................................      --     (0.2)       --
Other.....................................................     1.4       --      (3.0)
                                                            ------   ------   -------
  Net realized gains (losses) before expenses.............   (16.2)     2.6    (119.4)
Investment expenses.......................................    (6.5)    (4.9)     (6.8)
                                                            ------   ------   -------
  Net realized losses.....................................  $(22.7)  $ (2.3)  $(126.2)
                                                            ======   ======   =======
</TABLE>
 
                                      F-16
<PAGE>   87
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Changes in unrealized appreciation (depreciation) on investments carried at
estimated fair value, net of the effects on other balance sheet accounts, were
as follows:
 
<TABLE>
<CAPTION>
                                                            1997     1996      1995
                                                           ------   -------   -------
                                                             (DOLLARS IN MILLIONS)
<S>                                                        <C>      <C>       <C>
Investments carried at estimated fair value:
  Actively managed fixed maturities......................  $250.0   $(238.1)  $ 947.5
  Equity securities......................................     0.3        --       0.4
  Other..................................................     1.3     (10.1)     11.0
                                                           ------   -------   -------
     Change in unrealized appreciation (depreciation),
       gross.............................................   251.6    (248.2)    958.9
Less effect on other balance sheet accounts:
  Cost of policies purchased.............................   (37.7)     18.9     (63.7)
  Cost of policies produced..............................   (71.0)     68.3    (196.7)
  Insurance liabilities..................................      --      36.3     (36.3)
  Other liabilities......................................    (3.3)     (7.8)     25.8
  Deferred income taxes..................................   (48.8)     46.4    (240.7)
                                                           ------   -------   -------
     Change in unrealized appreciation (depreciation),
       net...............................................  $ 90.8   $ (86.1)  $ 447.3
                                                           ======   =======   =======
</TABLE>
 
     At December 31, 1997, the aggregate carrying value of the Company's MBS
portfolio was approximately $2.9 billion, or 26.4% of total invested assets. The
following table sets forth the carrying value of the Company's MBS portfolio by
structural type and underlying collateral coupon class as of December 31, 1997:
 
<TABLE>
<CAPTION>
                                                             COLLATERAL COUPON CLASS
                                             -------------------------------------------------------
                                             7% AND                             9.01% AND
                 MBS TYPE                    BELOW    7.01-8.00%   8.01-9.00%     ABOVE      TOTAL
                 --------                    ------   ----------   ----------   ---------   --------
                                                              (DOLLARS IN MILLIONS)
<S>                                          <C>      <C>          <C>          <C>         <C>
Agency pass-throughs.......................  $865.2     $764.9       $23.9        $ 8.4     $1,662.4
Commercial MBS.............................    34.9       61.2         1.1           --         97.2
CMOs:
  PACs, TACs and VADMs.....................   271.3      141.9         6.2           --        419.4
  Sequentials..............................   118.3      167.1        80.1         42.7        408.2
  Supports and other.......................    21.4       11.9          --           --         33.3
  Mezzanines and subordinates..............    24.5        9.4          --           --         33.9
  Z-tranches...............................    29.2        5.8        30.5           --         65.5
  ARMs and floaters........................        (a)         (a)        (a)          (a)     156.5
                                                                                            --------
          Total CMOs.......................                                                  1,116.8
                                                                                            --------
          Total MBS........................                                                 $2,876.4
                                                                                            ========
</TABLE>
 
- ---------------
 
(a) The collateral coupon rates are not meaningful as they reset periodically in
    accordance with changes in market interest rates.
 
     Asset-backed securities ("ABS") are securitized pools of assets, such as
manufactured housing loans and credit card receivables, that are collateralized
by the underlying loans. ABS are typically structured similarly to CMOs or MBS
pass-throughs, but are usually not subject to as much prepayment risk as MBS.
Senior-tranche ABS contain credit enhancement features that raise the quality of
the ABS above that of the underlying loans. At December 31, 1997, the aggregate
carrying value of the Company's ABS portfolio was
 
                                      F-17
<PAGE>   88
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
$497.7 million, or 4.6% of total invested assets. The following table sets forth
the carrying value of the Company's ABS portfolio by collateral type as of
December 31, 1997:
 
<TABLE>
<CAPTION>
                                                                 CARRYING VALUE
                                                              ---------------------
                                                              (DOLLARS IN    AS A
                      COLLATERAL TYPE                          MILLIONS)    PERCENT
                      ---------------                         -----------   -------
<S>                                                           <C>           <C>
Manufactured housing loans..................................    $214.9        43.2%
Home equity loans...........................................     133.8        26.9
Emerging markets debt.......................................      30.9         6.2
Credit card receivables.....................................      28.3         5.7
Automobile loans............................................      28.0         5.6
Commercial loans............................................      25.0         5.0
Airplane leases.............................................      14.4         2.9
Home improvement loans......................................      11.8         2.4
All other...................................................      10.6         2.1
                                                                ------       -----
          Total asset-backed securities.....................    $497.7       100.0%
                                                                ======       =====
</TABLE>
 
     At December 31, 1997, the Company had total mortgage loans of $102.5
million, or 0.9% of total invested assets, consisting of $72.7 million of
commercial mortgages and $29.8 million of mortgage investments in junior and
residual interest of CMOs ("CMO residuals"). Total mortgage loans at year-end
1997 decreased by $20.2 million from $122.7 million at year-end 1996. This
decrease reflects payoffs of $14.4 million and paydowns of $5.8 million received
during 1997. There were no commercial mortgage loan originations in 1997.
Approximately 71% of the commercial mortgages were on properties located in
three states -- Florida (29%), Texas (24%), and North Carolina (18%),
respectively. No other state comprised greater than 8% of the total commercial
mortgage loan balance.
 
     The CMO residuals entitle the Company to the excess cash flows arising from
the difference between (i) the cash flows required to make principal and
interest payments on the other tranches of the CMO and (ii) the actual cash
flows received on the mortgage loan assets backing the CMO. If prepayments or
credit losses on the underlying mortgage loan assets vary from projections, the
total cash flows to the Company could differ from projections. Changes in
projected cash flows which impact the yields of the CMO residuals are recognized
in investment income prospectively. The average yield of the Company's CMO
residuals was 9.5% at December 31, 1997.
 
     During 1996 the Company recognized $0.2 million of realized losses on
mortgage loans, compared with none in 1997 and 1995. The Company had no
nonperforming mortgage loans as of December 31, 1997 and 1996.
 
     At December 31, 1997, the Company held $217.0 million, or 2.0% of total
invested assets, of credit-tenant loans ("CTLs") compared to $208.5 million at
year-end 1996. CTLs are mortgage loans for commercial properties which require,
as stipulated by the Company's underwriting guidelines, (i) the lease of the
principal tenant to be assigned to the Company (including the direct receipt by
the Company of the tenant's lease payments) and to produce adequate cash flow to
fund the requirements of the loan and (ii) the principal tenant (or the
guarantor of such tenant's obligations) to have a credit rating of generally at
least "BBB" or its equivalent. The underwriting guidelines take into account
such factors as the lease terms on the subject property; the borrower's
management ability, including business experience, property management
capabilities and financial soundness; and such economic, demographic or other
factors that may affect the income generated by the property or its value. The
underwriting guidelines also require a loan-to-value ratio of 75% or less.
Because CTLs are principally underwritten on the basis of the creditworthiness
of the tenant rather than on the value of the underlying property, they are
classified as a separate class of securities for
 
                                      F-18
<PAGE>   89
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
financial reporting purposes. As with commercial mortgage loans, CTLs are
additionally secured by liens on the underlying property.
 
     As part of its investment strategy, the Company enters into mortgage dollar
roll and reverse repurchase transactions principally to increase investment
earnings and to improve liquidity. These transactions are typically terminable
after 30 days and are accounted for as short-term investment borrowings, with
the proceeds of such borrowings typically reinvested in short-term financial
instruments. The dollar rolls are collateralized by mortgage-backed agency
pass-throughs with fair values approximating the underlying loan value. Such
borrowings were $419.7 million and $134.6 million at December 31, 1997 and 1996,
respectively. At December 31, 1997 and 1996, the weighted average interest rate
approximated 5.5% and 5.0%, respectively.
 
     At December 31, 1997, the Company had outstanding interest rate swap
agreements with total notional contract amounts of $230.0 million, compared to
$330.0 million at December 31, 1996. The $100.0 million decrease resulted from
several contracts expiring in 1997. The remaining contracts expire at various
dates in 1998 and 1999. At December 31, 1997 and 1996, the average contractual
floating-pay rates approximated 5.9% and 5.7%, respectively, and the average
fixed-receipt rates approximated 7.2% and 7.3%, respectively. The Company's
interest rate swaps had an estimated fair value of a positive $1.1 million and
$4.4 million at year-end 1997 and 1996, respectively.
 
     Excluding investments issued, assumed or guaranteed by the U. S. government
or U.S. government agencies, the Company had no investments in any entity in
excess of 10% of shareholder's equity or $131.1 million as of December 31, 1997.
The Company's twenty non-U.S. government issuer concentrations were as follows:
 
<TABLE>
<CAPTION>
                                                              AMORTIZED   ESTIMATED
                      COLLATERAL TYPE                           COST      FAIR VALUE
                      ---------------                         ---------   ----------
                                                              (DOLLARS IN MILLIONS)
<S>                                                           <C>         <C>
 1. British Columbia Hydro & Power..........................  $   93.7     $   88.7
 2. Occidental Petroleum....................................      81.4         89.0
 3. Time Warner, Inc........................................      77.3         85.6
 4. Paine Webber Group......................................      76.0         80.8
 5. American Airlines.......................................      74.6         85.0
 6. Federal Express.........................................      68.1         73.6
 7. USX Corp................................................      67.1         71.9
 8. May Department Stores...................................      60.9         62.4
 9. Ford Motor Co./Ford Capital.............................      60.8         63.6
10. Lehman Brothers.........................................      58.4         61.6
11. Phillips Petroleum......................................      57.6         66.1
12. Long Island Lighting....................................      56.9         57.0
13. Continental Cablevision, Inc............................      56.7         59.6
14. Freeport-McMoran........................................      55.2         51.3
15. BankAmerica Corp........................................      54.1         55.1
16. Salomon, Inc............................................      52.4         54.7
17. McDonnell Douglas.......................................      50.8         58.6
18. Wal-Mart Stores.........................................      50.7         51.2
19. Northern Indiana Public Service.........................      50.4         52.4
20. United Airlines.........................................      50.2         54.0
                                                              --------     --------
                                                              $1,253.3     $1,322.2
                                                              ========     ========
</TABLE>
 
                                      F-19
<PAGE>   90
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
3. INSURANCE LIABILITIES:
 
     Insurance liabilities consisted of the following:
 
<TABLE>
<CAPTION>
                                                                     INTEREST        DECEMBER 31,
                                          WITHDRAWAL   MORTALITY       RATE      ---------------------
                                          ASSUMPTION   ASSUMPTION   ASSUMPTION     1997        1996
                                          ----------   ----------   ----------   ---------   ---------
                                                                                 (DOLLARS IN MILLIONS)
<S>                                       <C>          <C>          <C>          <C>         <C>
Future policy benefits:
  Investment contracts..................      N/A         N/A             (d)    $8,294.2    $7,274.3
  Limited-payment contracts.............     None          (b)         4%-11%     1,418.8     1,328.1
  Traditional life insurance
     contracts..........................       (a)         (c)            (e)        32.5        32.5
  Universal life-type contracts.........      N/A         N/A            N/A         36.7        43.5
  Claims payable and other
     policyholders' funds...............      N/A         N/A            N/A         18.8         1.5
                                                                                 --------    --------
          Total insurance liabilities...                                         $9,801.0    $8,679.9
                                                                                 ========    ========
</TABLE>
 
- ---------------
 
(a)  Company experience.
 
(b)  Principally the 1984 United States Population Table.
 
(c)  Principally modifications of the 1965C70 Basic, Select and Ultimate Tables.
 
(d)  In 1997 and 1996, approximately 95% of this liability represented account
     balances where future benefits were not guaranteed and 5% represented the
     present value of guaranteed future benefits determined using interest rates
     ranging from 3% to 12%.
 
(e)  Various, ranging from 3% to 6% in 1997 and 1996.
 
     Realized gains on fixed maturities during 1994 reduced the expected future
yields on the investment of policyholder balances to the extent that future cash
flows on certain products were insufficient to cover future benefits and
expenses. No additions to liabilities were required in 1997 and 1996.
 
4. REINSURANCE:
 
     In the normal course of business, the Company seeks to limit its exposure
to loss on any single policy and to recover a portion of benefits paid by ceding
reinsurance to other insurance enterprises or reinsurers under excess coverage
contracts. The Company has set its retention limit for acceptance of risk on
life insurance policies at various levels up to $0.8 million. To the extent that
reinsuring companies are unable to meet obligations under these agreements, the
Company remains contingently liable. The Company evaluates the financial
condition of its reinsurers to minimize its exposure to significant losses from
reinsurer insolvencies. Assets and liabilities relating to reinsurance contracts
are reported gross of the effects of reinsurance. Reinsurance receivables and
prepaid reinsurance premiums, including amounts related to insurance
liabilities, are reported as assets.
 
     Direct and assumed life insurance in force totaled $495.8 million, $561.5
million and $628.6 million at December 31, 1997, 1996 and 1995, respectively and
ceded life insurance in force totaled $212.8 million, $247.6 million and $286.1
million at December 31, 1997, 1996 and 1995, respectively.
 
     The cost of ceded policies containing mortality risks totaled $1.2 million
in 1997, $1.5 million in 1996, and $1.3 million in 1995, and was deducted from
insurance premium revenue. Reinsurance recoveries netted against insurance
policy benefits totaled $1.5 million, $1.4 million and $4.5 million in 1997,
1996 and 1995, respectively.
 
                                      F-20
<PAGE>   91
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Effective October 1, 1995, the Company recaptured certain annuity business
with assets approximately equal to insurance liabilities of $72.8 million that
had previously been ceded.
 
     In October 1995, the Company and American General Life Insurance Company
("AG Life") entered into a modified coinsurance agreement. Under the agreement,
AG Life issues the SPIAs, and 50% of each risk is reinsured to the Company.
Under this arrangement, the Company reports its pro rata share of premiums and
shares in its pro rata portion of the gain or loss on policies sold. Pursuant to
this arrangement, the Company assumed premiums of $126.3 million and $90.9
million for the years ended December 31, 1997 and 1996, respectively. The
arrangement resulted in $126.8 million and $91.3 million of revenues and
expenses for the Company in 1997 and 1996, respectively. As of December 31, 1997
and 1996, the funds held by reinsurer and the insurance liabilities resulting
from this agreement were $219.5 million and $96.6 million, respectively.
 
     Since 1994, the Company has been a party to a standby reinsurance agreement
for new SPDA sales through selected financial institutions, which becomes
effective only if the Company's risk-based capital ratio falls below a
prescribed level. No reinsurance pursuant to this agreement has become
effective.
 
5. INCOME TAXES:
 
     The components of income tax included in the balance sheet are as follows:
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                              ----------------------
                                                                1997         1996
                                                              ---------    ---------
                                                              (DOLLARS IN MILLIONS)
<S>                                                           <C>          <C>
Deferred income tax liabilities:
  Investments...............................................   $ 20.0       $ 21.1
  Cost of policies produced and purchased...................    176.0        143.6
  Unrealized appreciation of investments....................     69.9         21.1
                                                               ------       ------
     Gross deferred income tax liabilities..................    265.9        185.8
Deferred income tax assets:
  Insurance liabilities.....................................    105.4         80.6
  Other.....................................................      6.7          8.8
                                                               ------       ------
     Gross deferred income tax assets.......................    112.1         89.4
Net deferred income tax liabilities.........................   $153.8       $ 96.4
                                                               ======       ======
</TABLE>
 
Income tax expense was as follows:
 
<TABLE>
<CAPTION>
                                                             1997     1996      1995
                                                             -----    -----    ------
                                                              (DOLLARS IN MILLIONS)
<S>                                                          <C>      <C>      <C>
Current tax provision (benefit)............................  $55.8    $31.6    $(23.0)
Deferred tax provision.....................................    9.1     27.5      29.3
                                                             -----    -----    ------
          Income tax expense...............................  $64.9    $59.1    $  6.3
                                                             =====    =====    ======
</TABLE>
 
                                      F-21
<PAGE>   92
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Income tax expense differed from that computed at the applicable federal
statutory rate (35% during 1997, 1996 and 1995) for the following reasons:
 
<TABLE>
<CAPTION>
                                                              1997     1996     1995
                                                              -----    -----    -----
                                                               (DOLLARS IN MILLIONS)
<S>                                                           <C>      <C>      <C>
Federal tax on income before income taxes at statutory
  rates.....................................................  $63.1    $59.1    $ 7.6
State taxes.................................................    1.4      0.3      0.5
Various adjustments.........................................    0.4     (0.3)    (1.8)
                                                              -----    -----    -----
          Income tax expense................................  $64.9    $59.1    $ 6.3
                                                              =====    =====    =====
</TABLE>
 
     During 1995, the Company assigned its right to tax benefits related to
realized investment losses generated during 1995 to an affiliate in return for
cash payments equal to the tax benefits. During 1995, the Company received $36.9
million and at December 31, 1995, $9.7 million, included in other assets,
related to the remaining 1995 tax benefits receivable from the affiliate.
 
6. FAIR VALUE OF FINANCIAL INSTRUMENTS:
 
     Statement of Financial Accounting Standards No. 107, Disclosures about Fair
Values of Financial Instruments ("SFAS 107") requires disclosures of fair value
information about financial instruments, and includes assets and liabilities
recognized or not recognized in the balance sheet, for which it is practicable
to estimate their fair value. In cases where quoted market prices are not
available, fair values are based on estimates using discounted cash flow or
other valuation techniques. Those techniques are significantly affected by the
assumptions used, including the discount rates and estimates of the amount and
timing of future cash flows. SFAS 107 excludes certain insurance liabilities and
other non-financial instruments from its disclosure requirements, such as the
amount for the value associated with customer or agent relationships, the
expected interest margin (interest earnings over interest credited) to be earned
in the future on investment-type products, or other intangible items.
Accordingly, the aggregate fair value amounts presented herein do not
necessarily represent the underlying value of the Company; likewise, care should
be exercised in deriving conclusions about the Company's business or financial
condition based on the fair value information presented herein.
 
     The following methods and assumptions were used by the Company in
determining estimated fair values of financial instruments:
 
          Fixed maturities and equity securities: The estimated fair values for
     actively traded fixed maturities and equities are based on quoted market
     prices. For fixed maturities and equities not actively traded, the
     estimated fair values are determined using values obtained from independent
     pricing services or, in the case of private placements, by discounting
     expected future cash flows using a current market rate commensurate with
     the credit quality, prepayment optionality and maturity of the respective
     securities.
 
          Short-term investments: The carrying values approximate estimated fair
     value.
 
          Mortgage loans, credit-tenant loans, and policy loans: The estimated
     fair values for mortgage loans, CTLs and policy loans are determined by
     discounting future expected cash flows using interest rates currently being
     offered for similar loans to borrowers with similar credit ratings.
 
          Other invested assets: The estimated fair values are determined using
     quoted market prices for similar instruments.
 
          Insurance liabilities for investment contracts: The estimated fair
     values are determined using discounted cash flow calculations based on
     interest rates currently being offered for similar contracts with
     maturities consistent with those remaining for the contracts being valued.
     The estimated fair values of the
                                      F-22
<PAGE>   93
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     insurance liabilities for investment contracts were approximately equal to
     the carrying values as of December 31, 1997 and 1996, because interest
     rates credited on the vast majority of account balances approximate current
     rates paid on similar investments and are not generally guaranteed beyond
     one year. Fair values for the Company's insurance liabilities other than
     those for investment-type insurance contracts are not required to be
     disclosed. However, the estimated fair values of liabilities for all
     insurance contracts are taken into consideration in the Company's overall
     management of interest rate risk, which minimizes exposure to changing
     interest rates through the matching of investment maturities with amounts
     due under insurance contracts.
 
          Investment borrowings: The carrying values approximate estimated fair
     value.
 
     The estimated fair values and carrying values of the Company's financial
instruments were as follows:
 
<TABLE>
<CAPTION>
                                                                    DECEMBER 31,
                                                    --------------------------------------------
                                                            1997                    1996
                                                    --------------------    --------------------
                                                      FAIR      CARRYING      FAIR      CARRYING
                                                     VALUE       VALUE       VALUE       VALUE
                                                    --------    --------    --------    --------
                                                               (DOLLARS IN MILLIONS)
<S>                                                 <C>         <C>         <C>         <C>
Assets:
  Fixed maturities and equity securities..........  $9,999.6    $9,999.6    $8,842.5    $8,842.5
  Mortgage loans, credit-tenant loans and policy
     loans........................................     387.2       381.3       396.2       398.0
  Other invested assets...........................      33.4        33.4        24.5        24.5
  Short-term investments..........................     475.6       475.6       105.8       105.8
Liabilities:
  Insurance liabilities for investment
     contracts....................................   8,294.2     8,294.2     7,274.3     7,274.3
  Investment borrowings...........................     434.6       434.6       156.3       156.3
</TABLE>
 
7. SHAREHOLDER'S EQUITY:
 
     Generally, dividends that can be paid by the Company during any
twelve-month period cannot exceed the greater of statutory net gain from
operations (excluding realized gains on investments) for the preceding year or
10% of statutory surplus at the end of the preceding year. In 1998, the Company
can pay dividends of up to $76.3 million.
 
                                      F-23
<PAGE>   94
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     The components of the balance sheet caption "unrealized appreciation of
investments, net" in shareholder's equity are summarized as follows:
 
<TABLE>
<CAPTION>
                                       DECEMBER 31, 1997                    DECEMBER 31, 1996
                               ----------------------------------   ---------------------------------
                                           EFFECT OF                            EFFECT OF
                                 COST     FAIR VALUE    CARRYING      COST     FAIR VALUE    CARRYING
                                BASIS     ADJUSTMENTS     VALUE      BASIS     ADJUSTMENTS    VALUE
                               --------   -----------   ---------   --------   -----------   --------
                                                       (DOLLARS IN MILLIONS)
<S>                            <C>        <C>           <C>         <C>        <C>           <C>
Investments:
  Actively managed fixed
     maturities..............  $9,635.1     $354.1      $ 9,989.2   $8,738.4     $104.1      $8,842.5
  Equity securities..........      10.1        0.3           10.4         --         --            --
  Other invested assets......      31.2        2.2           33.4       23.6        0.9          24.5
                               --------     ------      ---------   --------     ------      --------
                                9,676.4      356.6       10,033.0    8,762.0      105.0       8,867.0
Other Balance Sheet Items:
  Cost of policies
     purchased...............      66.5      (58.8)           7.7       71.5      (21.1)         50.4
  Cost of policies
     produced................     517.1      (99.1)         418.0      408.3      (28.1)        380.2
  Other liabilities..........     (53.9)       1.1          (52.8)     (34.7)       4.4         (44.1)
  Deferred income taxes......     (83.9)     (69.9)        (153.8)     (75.3)     (21.1)        (96.4)
                               --------     ------      ---------   --------     ------      --------
  Unrealized appreciation of
     investments, net........               $129.9                  $   39.1
                                            ======                  ========
</TABLE>
 
     In September 1996, Western National generated net proceeds of $125.9
million from the issuance of preferred stocks to American General. Such net
proceeds were contributed to the Company.
 
8. COMMITMENTS AND CONTINGENCIES:
 
  Commitments
 
     The Company leases office space and equipment under noncancellable
operating leases. The approximate future minimum lease rental commitments under
such leases as of December 31, 1997 are as follows (dollars in thousands):
 
<TABLE>
<CAPTION>
                  YEAR ENDING DECEMBER 31,
                  ------------------------
<S>                                                           <C>
1998........................................................  1,123
1999........................................................  1,112
2000........................................................  1,028
2001........................................................    581
2002........................................................    581
Thereafter..................................................    823
                                                              -----
                                                              5,248
                                                              =====
</TABLE>
 
     Rent expense was $946,000, $1,018,000 and $752,000 in 1997, 1996, and 1995,
respectively.
 
     Until May 1, 1998, the Company is committed to reimburse the AGA Series
Trust (formerly WNL Series Trust) for administrative expenses in excess of .12%
of the market value of investments related to variable annuity policies issued
by the Company. During 1997 and 1996, the Company incurred approximately $0.9
million and $0.6 million, respectively, related to this commitment.
 
                                      F-24
<PAGE>   95
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
  Contingencies
 
     Assessments are levied on the Company from time to time by guaranty fund
associations of states in which it is licensed to provide for payment of covered
claims or to meet other insurance obligations, subject to prescribed limits, of
insolvent insurance enterprises. Assessments are allocated to an insurer based
on the ratio of premiums written by an insurer to total premiums written in the
state. The terms of the assessments depend on how each guaranty fund association
elects to fund its obligations. Assessments levied by certain states may be
recoverable through a reduction in future premium taxes. The Company provides a
liability, net of discount and estimated premium tax offsets, for estimated
future assessments of known insolvencies. Included in other liabilities is a
reserve for guaranty fund assessments of $16.6 million, $22.1 million, and $29.2
million in 1997, 1996, and 1995, respectively. The Company determines guaranty
fund liabilities by utilizing a report prepared annually by the National
Organization of Life and Health Insurance Guaranty Associations which provides
estimates of assessments by insolvency. Although management believes the
provision for guaranty fund assessments is adequate for all known insolvencies,
and does not currently anticipate the need for any material additions to the
reserve for known insolvencies. However, it is reasonably possible that the
estimates on which the provision is based will change and that such changes will
result in future adjustments.
 
     From time to time, the Company is involved in lawsuits which are related to
its operations. In most cases, such lawsuits involve claims under insurance
policies or other contracts of the Company. None of the lawsuits currently
pending, either individually or in the aggregate, is expected to have a material
effect on the Company's financial condition or results of operations.
 
9. EMPLOYEE BENEFIT PLAN:
 
     Prior to January 1, 1998, Western National sponsored a qualified defined
contribution plan (the "Plan") covering all full-time employees. The Plan
provided for the Company to match, with equivalent value of Western National
stock, 50% of a participant's voluntary contributions up to 4% of a
participant's compensation (subject to certain Internal Revenue Code
limitations). The Company could also elect to make additional discretionary
contributions to the Plan. For 1996 and 1995, the Company made a matching
contribution in an amount equal to 65% and 50%, respectively, of each
participant's elective contributions, up to 6% of annual compensation (subject
to Internal Revenue Code limitations). During 1997 the Company's matching
contribution was increased to 75% for 1997 contributions. The Company's
Supplemental Plan is an unfunded, nonqualified plan that provided to certain
employees similar benefits that could not be provided by a qualified defined
contribution plan due to Internal Revenue Code limitations. Prior to January 1,
1998, participants could defer additional amounts of salary and bonus under the
Supplemental Plan, but there was no employer match for such additional
contributions. Expense recorded related to the Company's matching contributions
under both plans was approximately $480,000, $451,000 and $247,000 in 1997,
1996, and 1995, respectively.
 
     On December 31, 1997, active employees of the Company who were plan
participants became 100% vested under the Plan. Effective March 1, 1998, the
Plan will be merged with the American General Employees' Thrift and Incentive
Plan. As of December 31, 1997, no additional contributions may be made to the
Plan or the Supplemental Plan.
 
10. RELATED PARTY TRANSACTIONS:
 
     See Note 4 for a description of the modified coinsurance agreement with AG
Life.
 
                                      F-25
<PAGE>   96
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
11. OTHER OPERATING STATEMENT DATA:
 
     Insurance policy income consisted of the following:
 
<TABLE>
<CAPTION>
                                                         1997        1996       1995
                                                       ---------   ---------   -------
                                                            (DOLLARS IN MILLIONS)
<S>                                                    <C>         <C>         <C>
Premiums collected...................................  $ 2,051.1   $ 1,625.5   $ 720.4
Reinsurance ceded....................................       (1.2)       (1.5)     (0.9)
                                                       ---------   ---------   -------
Premiums collected, net..............................    2,049.9     1,624.0     719.5
Less premiums on universal life and investment
  contracts without mortality risk which are recorded
  as additions to insurance liabilities..............   (2,040.8)   (1,613.4)   (697.8)
                                                       ---------   ---------   -------
Premiums on products with mortality risk, recorded as
  insurance policy income............................        9.1        10.6      21.7
Reinsurance assumed..................................      109.4        71.1       0.0
Amortization of deferred revenue.....................        0.6         0.5       0.5
Fees and surrender charges...........................        6.9         4.4       4.2
Other................................................        0.9         4.4       0.0
                                                       ---------   ---------   -------
          Insurance policy income....................  $   126.9   $    91.0   $  26.4
                                                       =========   =========   =======
</TABLE>
 
     The changes in the cost of policies purchased were as follows:
 
<TABLE>
<CAPTION>
                                                            1997      1996      1995
                                                           ------    ------    ------
                                                             (DOLLARS IN MILLIONS)
<S>                                                        <C>       <C>       <C>
Balance, beginning of year before effect of fair value
  adjustments of actively managed fixed maturities.......  $ 71.5    $ 75.8    $ 80.5
Scheduled amortization...................................    (5.0)     (4.3)     (4.7)
                                                           ------    ------    ------
Balance, end of year before effect of fair value
  adjustments of actively managed fixed maturities.......    66.5      71.5      75.8
Effect of fair value adjustment of actively managed fixed
  maturities.............................................   (58.8)    (21.1)    (40.0)
                                                           ------    ------    ------
Balance, end of year.....................................  $  7.7    $ 50.4    $ 35.8
                                                           ======    ======    ======
</TABLE>
 
     The changes in the cost of policies produced were as follows:
 
<TABLE>
<CAPTION>
                                                              1997     1996     1995
                                                             ------   ------   ------
                                                              (DOLLARS IN MILLIONS)
<S>                                                          <C>      <C>      <C>
Balance, beginning of year before effect of fair value
  adjustments of actively managed fixed maturities.........  $408.3   $325.1   $265.0
Acquisition costs incurred.................................   147.6    120.6     62.2
Scheduled amortization.....................................   (43.4)   (37.3)   (34.0)
Amortization related to realized gains and losses..........     4.0     (0.6)    29.8
Amortization of deferred revenue...........................     0.6      0.5      0.5
Effects of reinsurance.....................................     0.0      0.0      1.6
                                                             ------   ------   ------
Balance, end of year before effect of fair value
  adjustments of actively managed fixed maturities.........   517.1    408.3    325.1
Effect of fair value adjustment of actively managed fixed
  maturities...............................................   (99.1)   (28.1)   (96.4)
                                                             ------   ------   ------
Balance, end of year.......................................  $418.0   $380.2   $228.7
                                                             ======   ======   ======
</TABLE>
 
                                      F-26
<PAGE>   97
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
               (FORMERLY WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Based on current conditions and assumptions as to future events on all
policies in force, approximately 6% to 7% of the cost of policies purchased as
of December 31, 1997, excluding the effect of fair value adjustments for
actively managed fixed maturities, is expected to be amortized in each of the
next five years. The average discount rate for the cost of policies purchased
was approximately 19% for the year ended December 31, 1997.
 
12. STATUTORY INFORMATION:
 
     Statutory accounting practices prescribed or permitted for the Company by
regulatory authorities differ from generally accepted accounting principles. The
Company reported the following amounts to regulatory agencies:
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31,
                                                             ----------------------
                                                               1997         1996
                                                             ---------    ---------
                                                             (DOLLARS IN MILLIONS)
<S>                                                          <C>          <C>
Statutory capital and surplus..............................   $638.7       $572.4
Asset valuation reserve....................................    116.4        109.0
Interest maintenance reserve...............................    105.4        104.4
                                                              ------       ------
          Total............................................   $860.5       $785.8
                                                              ======       ======
</TABLE>
 
     Statutory accounting practices require that certain investment-related
portions of surplus, called the asset valuation reserve ("AVR") and the interest
maintenance reserve ("IMR"), be appropriated and reported as liabilities. The
purpose of these reserves is to stabilize statutory surplus against fluctuations
in the market value of investments. The AVR captures realized and unrealized
investment gains and losses related to changes in creditworthiness. The IMR
captures realized investment gains and losses on debt instruments resulting from
changes in interest rates and provides for subsequent amortization of such
amounts into statutory net income on a basis reflecting the remaining life of
the assets sold.
 
     The following table compares the pre-tax income determined on a statutory
accounting basis with such income reported herein in accordance with generally
accepted accounting principles:
 
<TABLE>
<CAPTION>
                                                             1997     1996     1995
                                                            ------   ------   -------
                                                              (DOLLARS IN MILLIONS)
<S>                                                         <C>      <C>      <C>
Pre-tax statutory net gain from operations................  $121.6   $ 65.3   $  51.6
IMR amortization..........................................   (12.6)    (8.7)     (8.7)
Realized gains (losses)...................................    12.3     15.1    (118.2)
                                                            ------   ------   -------
Pre-tax statutory income before transfers to and from and
  amortization of tax IMR.................................   121.3     71.7     (75.3)
Net effect of adjustments for generally accepted
  accounting principles...................................    58.9     97.4      97.0
                                                            ------   ------   -------
Pre-tax income, generally accepted accounting
  principles..............................................  $180.2   $169.1   $  21.7
                                                            ======   ======   =======
</TABLE>
 
13. YEAR 2000 CONTINGENCY (UNAUDITED)
 
     Management has been engaged in a program to render the Company's computer
systems (hardware and mainframe and personal applications software) Year 2000
compliant. The Company will incur internal staff costs as well as third-party
vendor and other expenses to prepare the systems for Year 2000. The cost of
testing and conversion of systems applications has not had, and is not expected
to have, a material adverse effect on the Company's results of operations or
financial condition. However, risks and uncertainties exist in most significant
systems development projects. If conversion of the Company's systems is not
completed on a timely basis, due to nonperformance by third-party vendors or
other unforeseen circumstances, the Year 2000 problem could have a material
adverse impact on the operations of the Company.
 
                                      F-27
<PAGE>   98
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
                        ON FINANCIAL STATEMENT SCHEDULE
 
To the Board of Directors of
American General Annuity Insurance Company
 
     Our report on the financial statements of American General Annuity
Insurance Company, formerly known as Western National Life Insurance Company, is
included on page F-3 of this Form N-4. In connection with our audits of such
financial statements, we have also audited the related financial statement
schedule listed in the index on page F-1 of this Form N-4.
 
     In our opinion, the financial statement schedule referred to above, when
considered in relation to the basic financial statements taken as a whole,
presents fairly, in all material respects, the information required to be
included therein.
 
                                            Coopers & Lybrand L.L.P.
 
Houston, Texas
February 5, 1997
 
                                      F-28
<PAGE>   99
 
                    WESTERN NATIONAL LIFE INSURANCE COMPANY
 
                                  SCHEDULE VI
 
                                  REINSURANCE
              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                               1997       1996       1995
                                                              -------    -------    -------
<S>                                                           <C>        <C>        <C>
Life insurance in force:
  Direct....................................................  $ 494.1    $ 559.3    $ 626.0
  Assumed...................................................      1.8        2.2        2.6
  Ceded.....................................................   (212.8)    (247.6)    (286.1)
                                                              -------    -------    -------
          Net insurance in force............................  $ 283.1    $ 313.9    $ 342.5
                                                              =======    =======    =======
          Percentage of assumed to net......................      0.6%       0.7%       0.7%
Premiums recorded as revenue for generally accepted
  accounting principles:
  Direct....................................................  $  10.3    $  12.1    $  23.0
  Assumed...................................................    109.4       71.1         --
  Ceded.....................................................     (1.2)      (1.5)      (1.3)
                                                              -------    -------    -------
          Net premiums......................................  $ 118.5    $  81.7    $  21.7
                                                              =======    =======    =======
          Percentage of assumed to net......................     92.3%      87.0%       0.0%
</TABLE>
 
                                      F-29
<PAGE>   100
 
                             AGA SEPARATE ACCOUNT A
                       (FORMERLY, WNL SEPARATE ACCOUNT A)
 
                   AMERICAN GENERAL ANNUITY INSURANCE COMPANY
              (FORMERLY, WESTERN NATIONAL LIFE INSURANCE COMPANY)
 
                       SUPPLEMENT DATED OCTOBER 28, 1998
 
The Prospectus to which this supplement is attached is hereby amended in the
following manner:
 
The Portfolios listed below are currently not available to Owners:
 
     - AIM V.I. Diversified Income Fund;
 
     - AIM V.I. Capital Appreciation Fund;
 
     - Oppenheimer High Income Fund;
 
     - Oppenheimer Growth Fund;
 
     - Oppenheimer Small Cap Growth Fund;
 
     - Oppenheimer Growth & Income Fund;
 
   
     - Templeton Developing Markets Fund; and
    
 
     - Templeton International Fund.


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