MUTUAL OF AMERICA SEPARATE ACCOUNT NO 2
497, 1999-05-10
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<PAGE>
PROSPECTUS
- --------------------------------------------------------------------------------
 
                    VARIABLE ACCUMULATION ANNUITY CONTRACTS
                                FOR THRIFT PLANS
                                   Issued By
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
                   320 Park Avenue, New York, New York 10022
                                  Through its
                             SEPARATE ACCOUNT NO. 2
   -------------------------------------------------------------------------
 
THE CONTRACTS--We offer a group variable accumulation annuity contract
(CONTRACT) for use by thrift plans or arrangements (PLANS) of employers in the
not-for-profit field (or their associations or trusts). A Plan must:
 
   -   be qualified under Section 401(a), including 401(k), of the Internal
       Revenue Code, or
 
   -   meet the requirements of Section 403(b) of the Internal Revenue Code.
 
PARTICIPANTS--A PARTICIPANT or YOU means a participating employee under a
Contract.
 
CONTRIBUTIONS--You make Contributions to your Account Balance, and your employer
may make Contributions on your behalf, depending on the Plan. Contributions are
in the amounts and at the frequency you choose, subject to restrictions in the
Plan and under Federal tax law provisions.
 
A Contract can help you accumulate funds for retirement and other long-term
financial needs. You may apply your Account Balance to provide fixed monthly
Annuity Payments that begin at a future date you select.
 
INVESTMENT ALTERNATIVES FOR YOUR ACCOUNT BALANCE--You may allocate your Account
Balance to any of the Funds of Mutual of America Separate Account No. 2 or to
our General Account, unless your Plan restricts allocations. You may transfer
all or any part of your Account Balance among the available Investment
Alternatives at any time, without charge. The Separate Account Funds invest in
similarly named funds or portfolios of mutual funds (the UNDERLYING FUNDS),
which currently are:
 
   -   MUTUAL OF AMERICA INVESTMENT CORPORATION: Equity Index, All America,
       Mid-Cap Equity Index, Aggressive Equity, Composite, Bond, Mid-Term
       Bond, Short-Term Bond and Money Market Funds;
 
   -   SCUDDER VARIABLE LIFE INVESTMENT FUND: Capital Growth, Bond and
       International Portfolios;
 
   -   FIDELITY INVESTMENTS-REGISTERED TRADEMARK- VARIABLE INSURANCE PRODUCTS
       FUNDS: Equity-Income Portfolio of the Variable Insurance Products
       Fund, and Contrafund and Asset Manager Portfolios of the Variable
       Insurance Products Fund II;
 
   -   CALVERT SOCIAL BALANCED PORTFOLIO of Calvert Variable Series, Inc.;
       and
 
   -   AMERICAN CENTURY VP CAPITAL APPRECIATION FUND of American Century
       Variable Portfolios, Inc.
 
WE DO NOT GUARANTEE THE INVESTMENT PERFORMANCE OF ANY SEPARATE ACCOUNT
FUND.  You have the entire investment risk, including the risk of a decline in
value, for amounts you allocate to a Separate Account Fund. The Underlying
Funds, and therefore the Separate Account Funds, will have varying investment
returns and performance.
 
We pay a fixed rate of interest on your Account Balance in the General Account,
and we change the rate from time to time. This Prospectus describes the Separate
Account Fund Investment Alternatives. There is a brief description of the
General Account under "Our General Account".
 
STATEMENT OF ADDITIONAL INFORMATION--You may obtain at no charge a Statement of
Additional Information (an SAI), dated May 1, 1999, about the Contracts and the
Separate Account by writing to us at the address at the top of this page or by
calling 1-212-224-1600. We have filed the SAI with the Securities and Exchange
Commission and incorporate it into this Prospectus by reference. The table of
contents for the SAI is at the end of this Prospectus for your review.
 
PROSPECTUSES--You should read this Prospectus before you purchase a Contract or
elect to become a Participant, and you should keep it for future reference. This
Prospectus is not valid unless the prospectuses of the Underlying Funds, which
you also should read, are attached to it.
 
THE SECURITIES AND EXCHANGE COMMISSION HAS NOT APPROVED OR DISAPPROVED THESE
SECURITIES OR PASSED UPON THE ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO
THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------
 
DATED: MAY 1, 1999
<PAGE>
                               TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                      <C>
                                                                              Page
                                                                         ---------
TABLE OF ANNUAL EXPENSES...............................................          1
SUMMARY OF INFORMATION IN THIS PROSPECTUS..............................          3
ABOUT MUTUAL OF AMERICA AND THE SEPARATE ACCOUNT.......................          7
UNDERLYING FUNDS INVESTED IN BY OUR SEPARATE ACCOUNT...................          8
CHARGES YOU OR YOUR EMPLOYER WILL PAY..................................         12
    Administrative Charges.............................................         12
    Distribution Expense Charge........................................         12
    Mortality and Expense Risk Charges.................................         12
    Employer Charges...................................................         13
    Expenses of the Underlying Funds...................................         13
    Premium Taxes......................................................         13
WHO MAY PURCHASE A CONTRACT AND MAKE CONTRIBUTIONS.....................         14
    Purchase of a Contract; Participation..............................         14
    Payment of Contributions...........................................         14
    Limits on Contributions............................................         15
    Allocation of Contributions........................................         15
YOUR ACCOUNT BALANCE IN THE SEPARATE ACCOUNT FUNDS.....................         16
OUR PAYMENT OF ACCOUNT BALANCE TO YOU OR A BENEFICIARY.................         17
    Your Right to Transfer Among Investment Alternatives...............         17
    Your Right to Make Withdrawals, including by Specified Payments....         17
    How to Tell Us an Amount to Transfer or Withdraw...................         18
    Loans..............................................................         18
    Death Benefit Prior to Annuity Commencement Date...................         18
    Discontinuance of a Contract.......................................         19
    When We May Postpone Payments......................................         20
YOU MAY OBTAIN AN ANNUITY WITH YOUR ACCOUNT BALANCE....................         21
    Amount of Annuity Payments.........................................         21
    Annuity Commencement Date..........................................         21
    Available Forms of Annuity.........................................         21
    Death Benefit After Annuity Commencement Date......................         22
    Lump Sum for Small Annuity Payments................................         22
OUR GENERAL ACCOUNT....................................................         23
HOW TO CONTACT US AND GIVE US INSTRUCTIONS.............................         24
ADMINISTRATIVE MATTERS.................................................         25
    Year 2000 Compliance...............................................         25
    Confirmation Statements to Participants............................         25
    Designation of Beneficiary.........................................         25
    Certain Administrative Provisions..................................         26
    Participation in Divisible Surplus.................................         26
FEDERAL TAX INFORMATION FOR PARTICIPANTS...............................         27
YOUR VOTING RIGHTS FOR MEETINGS OF THE UNDERLYING FUNDS................         31
PERFORMANCE INFORMATION FOR THE SEPARATE ACCOUNT FUNDS.................         31
FUNDING AND OTHER CHANGES WE MAY MAKE..................................         32
DEFINITIONS WE USE IN THIS PROSPECTUS..................................         33
OUR STATEMENT OF ADDITIONAL INFORMATION................................         35
APPENDIX A: UNIT VALUE INFORMATION FOR THE SEPARATE ACCOUNT FUNDS......         37
</TABLE>
 
THIS PROSPECTUS IS NOT AN OFFERING IN ANY JURISDICTION WHERE WE MAY NOT LAWFULLY
OFFER THE CONTRACTS FOR SALE. WE HAVE NOT AUTHORIZED ANY DEALER, SALESPERSON OR
OTHER PERSON TO GIVE ANY INFORMATION OR TO MAKE ANY REPRESENTATIONS ABOUT THE
CONTRACTS OTHER THAN THOSE IN THIS PROSPECTUS. A PROSPECTIVE PURCHASER WHO
RECEIVES UNAUTHORIZED INFORMATION OR REPRESENTATIONS MUST NOT RELY ON THEM TO
MAKE ANY PURCHASE DECISION.
<PAGE>
                            TABLE OF ANNUAL EXPENSES
- --------------------------------------------------------------------------------
 
      The first part of the table below shows the expenses of the Separate
      Account Funds during 1998 and the second part shows the expenses of
      the Underlying Funds during 1998, except that we have estimated the
      expenses of the Mid-Cap Equity Index Fund because it began
      operations on May 1, 1999.
<TABLE>
<CAPTION>
                                                  INVESTMENT COMPANY
                                       -----------------------------------------
                                                  ALL
                                                AMERICA,
                                               COMPOSITE,
                                                 BOND,      MID-CAP                                 FIDELITY
                                                MID-TERM    EQUITY                ---------------------------------------------
                                               BOND, AND   INDEX AND                                                  VIP II
                                       MONEY   SHORT-TERM   EQUITY    AGGRESSIVE   VIP EQUITY-        VIP II           ASSET
                                       MARKET     BOND       INDEX      EQUITY       INCOME         CONTRAFUND        MANAGER
                                       ------  ----------  ---------  ----------  -------------     -----------     -----------
<S>                                    <C>     <C>         <C>        <C>         <C>               <C>             <C>
PARTICIPANT TRANSACTION EXPENSES
  Sales Load or Deferred Sales
    Load...........................      None       None       None        None            None           None            None
  Surrender or Exchange Fees.......      None       None       None        None            None           None            None
ANNUAL CONTRACT FEE(1).............    $   24  $      24   $     24   $      24   $          24     $       24      $       24
                                       ------  ----------  ---------  ----------         ------     -----------     -----------
                                       ------  ----------  ---------  ----------         ------     -----------     -----------
SEPARATE ACCOUNT ANNUAL EXPENSES
  (as a percentage of average net
    assets)
  Mortality and Expense Risk
    Fees...........................       .50%       .50%       .50%        .50%            .50%           .50%            .50%
                                       ------  ----------  ---------  ----------         ------     -----------     -----------
  Account Fees and Expenses
      Administrative Charges (after
        reimbursement)(2)..........       .40%       .40%       .40%        .40%            .30%           .30%            .30%
      Distribution Expense
        Charge.....................       .35        .35        .35         .35             .35            .35             .35
                                       ------  ----------  ---------  ----------         ------     -----------     -----------
    Total Account Fees and
      Expenses.....................       .75        .75        .75         .75             .65            .65             .65
                                       ------  ----------  ---------  ----------         ------     -----------     -----------
  TOTAL SEPARATE ACCOUNT
    EXPENSES.......................      1.25%      1.25%      1.25%       1.25%           1.15%          1.15%           1.15%
                                       ------  ----------  ---------  ----------         ------     -----------     -----------
                                       ------  ----------  ---------  ----------         ------     -----------     -----------
UNDERLYING FUND ANNUAL EXPENSES
  (as a percentage of average net
    assets)(3)
  Management Fees..................       .25%       .50%      .125%        .85%            .49%           .59%            .54%
  Other Expenses (after
    reimbursement)(3)..............      None       None       None        None             .09            .11             .10%
                                       ------  ----------  ---------  ----------         ------     -----------     -----------
  TOTAL UNDERLYING FUND EXPENSES
    (AFTER REIMBURSEMENT)..........       .25%       .50%      .125%        .85%            .58%(4)        .70%(4)         .64%(4)
                                       ------  ----------  ---------  ----------         ------     -----------     -----------
                                       ------  ----------  ---------  ----------         ------     -----------     -----------
 
<CAPTION>
 
                                                       SCUDDER                    AMERICAN
                                       ---------------------------------------   CENTURY VP      CALVERT
                                         CAPITAL                                   CAPITAL       SOCIAL
                                         GROWTH         BOND       INTERNATIONAL APPRECIATION   BALANCED
                                       -----------   -----------   -----------   -----------   -----------
<S>                                    <C>           <C>           <C>           <C>           <C>
PARTICIPANT TRANSACTION EXPENSES
  Sales Load or Deferred Sales
    Load...........................           None          None         None          None          None
  Surrender or Exchange Fees.......           None          None         None          None          None
ANNUAL CONTRACT FEE(1).............    $        24   $        24   $       24    $       24    $       24
                                       -----------   -----------   -----------   -----------   -----------
                                       -----------   -----------   -----------   -----------   -----------
SEPARATE ACCOUNT ANNUAL EXPENSES
  (as a percentage of average net
    assets)
  Mortality and Expense Risk
    Fees...........................            .50%          .50%         .50%          .50%          .50%
                                       -----------   -----------   -----------   -----------   -----------
  Account Fees and Expenses
      Administrative Charges (after
        reimbursement)(2)..........            .40%          .40%         .40%          .20%          .40%
      Distribution Expense
        Charge.....................            .35           .35          .35           .35           .35
                                       -----------   -----------   -----------   -----------   -----------
    Total Account Fees and
      Expenses.....................            .75           .75          .75           .55           .75
                                       -----------   -----------   -----------   -----------   -----------
  TOTAL SEPARATE ACCOUNT
    EXPENSES.......................           1.25%         1.25%        1.25%         1.05%         1.25%
                                       -----------   -----------   -----------   -----------   -----------
                                       -----------   -----------   -----------   -----------   -----------
UNDERLYING FUND ANNUAL EXPENSES
  (as a percentage of average net
    assets)(3)
  Management Fees..................            .46%          .47%         .86%         1.00%          .70%
  Other Expenses (after
    reimbursement)(3)..............            .04           .10          .18          None           .18
                                       -----------   -----------   -----------   -----------   -----------
  TOTAL UNDERLYING FUND EXPENSES
    (AFTER REIMBURSEMENT)..........            .50%          .57%        1.04%         1.00%          .88%(5)
                                       -----------   -----------   -----------   -----------   -----------
                                       -----------   -----------   -----------   -----------   -----------
</TABLE>
 
   ------------------------------------
 
  (1) You pay a monthly amount of $2.00, or 1/12 of 1% of your Account Balance
     for the month if that amount would be less than $2.00. The above table
     reflects for each Separate Account Fund the full monthly charge, as
     though you had allocated your entire Account Balance only to that Fund.
     Your Employer may elect to pay the monthly charge, in which case we will
     not deduct the charge from your Account Balance. Your Employer must pay a
     monthly contract charge, which ranges up to $100 per group contract, and
     a monthly Participant charge of up to $4.00 per Participant. We waive the
     monthly Participant charge and the monthly Employer charges in some
     circumstances. SEE "Charges You or Your Employer Will Pay".
 
  (2) The investment adviser for the American Century VP Capital Appreciation
     Fund reimburses us at an annual rate of up to .20% for administrative
     expenses, and the transfer agent and distributor for the Fidelity
     Portfolios reimburse us at an annual rate of .10% for certain services we
     provide. The administrative expense for the corresponding Separate
     Account Funds would be .40% if the reimbursement arrangements ended. SEE
     "Charges You or Your Employer Will Pay--Administrative Charges".
 
  (3) The investment adviser for the Investment Company voluntarily limits the
     expenses of each Investment Company Fund to its investment advisory fee.
     The investment adviser for the American Century VP Capital Appreciation
     Fund pays the expenses of that Fund other than the investment advisory
     fee. The prospectuses of the Underlying Funds more fully describe the
     Funds' management fees and other expenses.
 
  (4) A portion of the brokerage commissions that these Portfolios pay was
     used to reduce their expenses. In addition, the Portfolios have entered
     into arrangements with their custodian and transfer agent whereby
     interest earned on uninvested cash balances reduces custodian and
     transfer agent expenses. Including these reductions, total operating
     expenses for the VIP Equity-Income Portfolio and the VIP II Contrafund
     and Asset Manager Portfolios for 1998 would have been .57%, .66% and
     .63%, respectively.
 
  (5) The Portfolio's total operating expenses have been restated to reflect
     the elimination of the performance adjustment in its management fees. The
     restatement includes the addition of 0.01% in expenses to the Portfolio.
     "Other Expenses" reflects an indirect fee, and the Portfolio's total
     operating expenses for 1998 after reductions for fees paid indirectly
     would be 0.86%.
 
                                       1
<PAGE>
EXAMPLES
- --------------------------------------------------------------------------------
 
The examples below show the expenses that you would pay, assuming a $1,000
investment and a 5% annual rate of return on assets. We do not impose a
surrender charge when you make a withdrawal of Account Balance. As a result, the
expenses would be the same whether or not you surrender the Account Balance at
the end of the applicable time period.
 
<TABLE>
<CAPTION>
                                                                                   1 YEAR       3 YEARS      5 YEARS     10 YEARS
                                                                                 -----------  -----------  -----------  -----------
<S>                                                                              <C>          <C>          <C>          <C>
EXAMPLE FOR INVESTMENT COMPANY EQUITY INDEX AND MID-CAP EQUITY INDEX FUNDS
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      17    $      53    $      93    $     212
EXAMPLE FOR INVESTMENT COMPANY ALL AMERICA, BOND, SHORT-TERM BOND, MID-TERM
 BOND AND COMPOSITE FUNDS
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      21    $      65    $     114    $     260
EXAMPLE FOR INVESTMENT COMPANY AGGRESSIVE EQUITY FUND
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      24    $      77    $     134    $     305
EXAMPLE FOR INVESTMENT COMPANY MONEY MARKET FUND
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      18    $      57    $     100    $     228
EXAMPLE FOR SCUDDER CAPITAL GROWTH FUND
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      21    $      65    $     114    $     260
EXAMPLE FOR SCUDDER BOND FUND
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      21    $      68    $     118    $     269
EXAMPLE FOR SCUDDER INTERNATIONAL FUND
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      26    $      83    $     145    $     330
EXAMPLE FOR FIDELITY VIP EQUITY-INCOME FUND
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      20    $      65    $     113    $     258
EXAMPLE FOR FIDELITY VIP II CONTRAFUND
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      22    $      68    $     120    $     273
EXAMPLE FOR FIDELITY VIP II ASSET MANAGER FUND
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      21    $      67    $     117    $     266
EXAMPLE FOR CALVERT SOCIAL BALANCED FUND
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      25    $      78    $     136    $     309
EXAMPLE FOR AMERICAN CENTURY VP CAPITAL APPRECIATION FUND
  Expenses on a $1,000 investment, assuming a 5% annual return on assets:......   $      24    $      75    $     131    $     300
</TABLE>
 
These examples are to assist you in understanding the various costs and expenses
that you will pay, directly or indirectly, under a Contract. The examples
reflect the expenses of the Separate Account, as well as those of the Underlying
Funds, as they were for the year ended December 31, 1998, except that the
expenses of the Mid-Cap Equity Index Fund are estimated because the Fund began
operations on May 1, 1999. ACTUAL EXPENSES FOR PERIODS AFTER 1998 MAY BE GREATER
OR LESS THAN THE EXPENSES ON WHICH WE BASED THE EXAMPLES.
 
We assumed a 5% annual rate of return in the examples for illustration purposes.
THE 5% RATE DOES NOT REPRESENT AND IS NOT A GUARANTEE OF THE SEPARATE ACCOUNT
FUNDS' PAST OR FUTURE INVESTMENT PERFORMANCE. Each example also assumed an
annual contract fee of $2.53 per $1,000 of value in the Separate Account Fund,
based on an average Account Balance of $9,496. The expenses shown do not include
any premium taxes that may be applicable.
 
ACCUMULATION UNIT VALUES FOR THE SEPARATE ACCOUNT FUNDS
- --------------------------------------------------------------------------------
 
For information about the Accumulation Unit values of each of the Separate
Account Funds over a period of time (other than for the Mid-Cap Equity Index
Fund, which commenced operations on May 1, 1999), you should see Appendix A to
this Prospectus. The Unit values reflect the investment performance and expenses
of the Underlying Funds and the charges we assess on the assets of the Separate
Account Funds. You may obtain a copy of the Separate Account's most recent
semi-annual or annual financial statements by calling us at 1-800-468-3785.
 
                                       2
<PAGE>
                   SUMMARY OF INFORMATION IN THIS PROSPECTUS
- --------------------------------------------------------------------------------
 
The discussion below is a summary of information in the Prospectus. The
references in the Summary direct you to particular sections in the Prospectus
where you will find more detailed explanations.
 
CONTRACTS WE OFFER
- --------------------------------------------------------------------------------
 
We offer group variable accumulation annuity contracts to assist with retirement
and long-term financial planning by not-for-profit organizations and their
employees. REFER TO "WHO MAY PURCHASE A CONTRACT AND MAKE CONTRIBUTIONS --
PURCHASE OF A CONTRACT; PARTICIPATION." The types of thrift plans or
arrangements for which we will issue a Contract are:
 
1.  TAX DEFERRED ANNUITY THRIFT PLAN (CALLED A TDA THRIFT PLAN OR A 403(b)
THRIFT PLAN).
We issue Contracts for Employers to fund annuity purchase arrangements that meet
the requirements of Section 403(b) of the Code. A Contractholder must be a
tax-exempt organization under Code Section 501(c)(3) or an eligible public
school or college, or an association that represents that type of tax-exempt
organization or eligible public school or college or its employees.
 
Under a 403(b) Thrift Plan Contract, you ordinarily make Contributions through a
voluntary salary reduction arrangement, where your Contributions are "pre-tax".
Your Employer usually matches all or part of these Contributions, under a fixed
matching formula (such as a set percentage). You may make additional
Contributions that your Employer does not match. An Employer may make
non-matched Contributions, and a formula set forth in the Plan will determine
how those Contributions are allocated to Participants. For Federal income tax
purposes, you may exclude Contributions from gross income within the limits
provided under Section 403(b). Some Plans permit only Employer Contributions.
 
2.  401(a) OR 401(k) THRIFT PLAN (CALLED A 401(a) OR 401(k) THRIFT PLAN).
We issue Contracts to fund annuity benefits under retirement plans that qualify
for special Federal income tax treatment under Section 401(a) of the Code,
including plans that are subject to the special requirements of Code Section
401(k) and "SIMPLE" plans under Section 401(k)(11). A Contractholder typically
is an Employer that has adopted a 401(a) or 401(k) Thrift Plan, although the
Contractholder may be the trustees of the Plan if a Plan provides for a trust.
 
Depending on the type of 401(a) Plan, you make Contributions:
 
   -   through a voluntary payroll deduction arrangement with the Employer,
       where the Contributions are "after-tax", meaning you may not deduct or
       exclude them from your gross income, or
 
   -   through a salary reduction agreement with the Employer, where the
       Contributions are "pre-tax", meaning you may exclude them from your
       gross income within the limits of Code Section 401(k).
 
The Employer generally matches all or a portion of your Contributions, under a
specific matching Contribution formula (such as a set percentage). You may make
additional Contributions that your Employer does not match. An Employer also may
specify or annually declare a non-matched amount to be allocated among
Participants under a specific formula set forth in the Plan.
 
We also issue Contracts to fund defined contribution pension and profit-sharing
plans that qualify under Code Section 401(a), and some of these Plans may
provide for Employer Contributions only.
 
CONTRIBUTIONS DURING THE ACCUMULATION PERIOD
- --------------------------------------------------------------------------------
 
Your Contributions and your Employer's Contributions on your behalf may be in
the amounts and made at the times a Plan permits or requires. Your Contributions
also must be in the amounts and at a frequency the Employer agrees to, based on
your payroll period.
 
MINIMUM REQUIRED.  Your Plan may require that your Contributions total $200 or
more each year.
 
                                       3
<PAGE>
LIMITS ON AMOUNTS.  The maximum annual Contributions are the amounts permitted
under the Code for the type of Plan or arrangements funded by the Contract.
REFER TO "WHO MAY PURCHASE A CONTRACT AND MAKE CONTRIBUTIONS--PAYMENT OF
CONTRIBUTIONS" AND "FEDERAL TAX INFORMATION FOR PARTICIPANTS".
 
INVESTMENT ALTERNATIVES FOR YOUR ACCOUNT BALANCE
- --------------------------------------------------------------------------------
 
You may allocate Contributions among the General Account and one or more of the
Separate Account Funds (unless your Plan restricts nonvested amounts in your
Account Balance to the General Account). At any time, you may change your
allocation instructions for future Contributions and transfer all or part of
your Account Balance among the available Investment Alternatives.
 
THE GENERAL ACCOUNT.  We pay interest on the portion of your Account Balance
allocated to our General Account, at an effective annual rate of at least 3%. In
our discretion, we change the current rate of interest from time to time. We
have the full investment risk for amounts you allocate to the General Account.
We sometimes refer to the General Account as the Interest Accumulation Account.
 
This Prospectus serves as a disclosure document for the Separate Account
Investment Alternatives under the Contracts. REFER TO "OUR GENERAL ACCOUNT" FOR
A BRIEF DESCRIPTION OF THE GENERAL ACCOUNT.
 
THE SEPARATE ACCOUNT.  The Separate Account has Funds, or sub-accounts. The name
of each Fund corresponds to the name of its Underlying Fund. When you allocate
Contributions or transfer Account Balance to a Separate Account Fund, the Fund
purchases shares in its Underlying Fund. A Separate Account Fund is called a
"variable option", because you have the investment risk that your Account
Balance in the Fund will increase or decrease based on the investment
performance of the Underlying Fund. The Mid-Cap Equity Index Fund will be
available to you following approval by your State's insurance department.
 
UNDERLYING FUNDS INVESTED IN BY THE SEPARATE ACCOUNT
- --------------------------------------------------------------------------------
 
The Separate Account Funds currently invest in seventeen Underlying Funds, which
have different investment objectives, investment policies and risks. You should
refer to "Underlying Funds Invested in by Our Separate Account" for more
information about the Underlying Funds' investment objectives, and to the
prospectuses of the Underlying Funds that are attached to this Prospectus.
 
CHARGES UNDER THE CONTRACTS
- --------------------------------------------------------------------------------
 
We deduct several charges from the net assets of each Separate Account Fund.
REFER TO "CHARGES YOU OR YOUR EMPLOYER WILL PAY". The charges include:
 
   -   an administrative expense charge at an annual rate of 0.40% (except
       that currently the annual rate for the American Century VP Capital
       Appreciation Fund is 0.20% and the annual rate for the Funds that
       invest in the Fidelity Portfolios is 0.30%);
 
   -   a charge at an annual rate of 0.35% for expenses related to the
       distribution of the Contracts; and
 
   -   a charge at an annual rate of 0.50% for assuming certain mortality and
       expense risks under the Contracts.
 
We also deduct from your Account Balance a monthly administrative expense
charge. The charge is $2.00 if you have an Account Balance of $2,400 or more
during the month, or 1/12 of 1% of the Account Balance (which will be less than
$2.00) if your Account Balance is less than $2,400 in any month. If your
Employer uses our Hotline system, we waive this charge each month your
Employer's total Contract assets are $5 million or more or there are at least
500 Participants. REFER TO "CHARGES YOU OR YOUR EMPLOYER WILL
PAY--ADMINISTRATIVE CHARGES".
 
RESERVATION OF RIGHTS.  We reserve the right to increase or decrease the
administrative expense charge, the monthly administrative charge and the expense
risk charge within the limits imposed under the Contracts, and the right to
deduct from Contributions any applicable State premium taxes. State insurance
provisions or federal securities laws may limit the amount of any additional
charges that we may impose.
 
                                       4
<PAGE>
EXPENSES OF THE UNDERLYING FUNDS.  A Separate Account Fund's value is based on
the shares it owns of the Underlying Fund. As a result, the investment
management fees and other expenses the Underlying Funds pay will impact the
value of the Separate Account Funds. You should refer to the attached
prospectuses of the Underlying Funds for a complete description of their fees
and expenses.
 
EMPLOYER CHARGES
- --------------------------------------------------------------------------------
 
We charge an Employer a monthly fee of $100 for administrative expenses we incur
for certain Plan-related services, with an additional monthly fee of $50 for
each set of separate records we maintain for affiliated Employers at different
locations. We also charge an Employer a monthly fee for each active Participant
under the Contract. The maximum fee is $4.00 per Participant, and we reduce the
fee for Employers with larger numbers of Participants. We do not charge a
monthly Participant fee if an Employer has more than 200 Active Participants.
 
We waive the monthly Employer charges and the monthly active Participant charges
if:
 
   -   an Employer elects to use a modified services arrangement under a
       Contract (which excludes certain Plan-related services); or
 
   -   the Employer's total Contract assets for the month are greater than $1
       million and the Employer uses our Hotline system.
 
We charge an Employer when a Participant who ends employment was partially
vested in the Participant's Account Balance. We will not charge for more than 50
Participants in a calendar year, and we limit the charge to the lesser of $50
and the amount of the nonvested Account Balance.
 
TRANSFERS AND WITHDRAWALS OF ACCOUNT BALANCE
- --------------------------------------------------------------------------------
 
During the Accumulation Period, you may transfer all or a portion of your
Account Balance among the Investment Alternatives, unless your Plan limits
transfers or restricts Contributions to only the General Account. If you have a
loan under a Plan, we restrict your transfer or withdrawal from the General
Account of the loan collateral amount. REFER TO "OUR PAYMENT OF ACCOUNT BALANCE
TO YOU OR A BENEFICIARY-- YOUR RIGHT TO TRANSFER AMONG INVESTMENT ALTERNATIVES".
 
During the Accumulation Period, you may withdraw all or a portion of your
Account Balance under the circumstances set forth in the Code and the Plan. You
generally may not withdraw Account Balance until you have reached the age of
59 1/2 or terminated employment with the Employer. If you are married, you may
need the consent of your Eligible Spouse in order to make a withdrawal. We may
take up to seven days following receipt of your withdrawal request to process
the request and mail a check to you. REFER TO "OUR PAYMENT OF ACCOUNT BALANCE TO
YOU OR A BENEFICIARY--YOUR RIGHT TO MAKE WITHDRAWALS, INCLUDING BY SPECIFIED
PAYMENTS".
 
Under our Specified Payments Option, if you are eligible to make withdrawals you
may instruct us to withdraw a certain amount (at least $100) each month from the
Investment Alternatives you name. You must be age 59 1/2 or older, or have
terminated employment after first reaching age 55, to elect this Option.
 
You may have taxable income upon any withdrawal of your Account Balance. You
will be taxed at ordinary income tax rates on the amount withdrawn, except for
the portion of the withdrawal that is considered to be a return of your
after-tax Contributions (if any). The taxable portion of withdrawals may be
subject to a 10% tax penalty, unless you have reached the age of 59 1/2, are
disabled or in certain other circumstances. REFER TO "FEDERAL TAX INFORMATION
FOR PARTICIPANTS".
 
The Code imposes minimum distribution requirements for the Contracts, when you
reach a certain age or in some other circumstances. You may be required to make
withdrawals of Account Balance, or may choose to begin receiving Annuity
Payments, to meet the minimum distribution requirements.
 
We currently do not assess a charge for transfers under the Contracts. We
reserve the right to impose a charge for transfers in the future.
 
                                       5
<PAGE>
HOW TO MAKE ALLOCATION CHANGES, TRANSFERS AND WITHDRAWALS
- --------------------------------------------------------------------------------
 
IN WRITING.  You may give instructions in writing on our forms to change the
allocations among Investment Alternatives for future Contributions, to transfer
your Account Balance among Investment Alternatives or to make withdrawals of
Account Balance. Certain withdrawals require the written consent of the Eligible
Spouse. REFER TO "HOW TO CONTRACT US AND GIVE US INSTRUCTIONS".
 
BY TELEPHONE.  Using the Personal Identification Number (PIN) we have assigned,
you may call us at 1-800-468-3785 to obtain information about your Account
Balance, to change the allocations among Investment Alternatives for future
Contributions and to transfer your Account Balance among Investment
Alternatives. REFER TO "HOW TO CONTACT US AND GIVE US INSTRUCTIONS".
 
OUR HOME OFFICE, PROCESSING CENTER AND REGIONAL OFFICES.  Our home office
address is 320 Park Avenue, New York, New York 10022. The address for our
Financial Transaction Processing Center, where you may send requests for
allocation changes or transfer among Investment Alternatives, is 1150 Broken
Sound Parkway NW, Boca Raton, FL 33487-3598. You may check the address of the
Regional Office that provides services for your Contract by calling
1-800-468-3785 or by visiting our Website at www.mutualofamerica.com.
 
CONFIRMATION STATEMENTS.  We will send you confirmation statements (which may be
part of your quarterly statements) for your allocation changes and for
Contributions by you or by your employer on your behalf, transfers of Account
Balance and withdrawals of Account Balance. You must promptly notify us of any
error in a confirmation statement or you will give up your right. Refer to
"ADMINISTRATIVE MATTERS-- CONFIRMATION STATEMENTS TO PARTICIPANTS".
 
DEATH BENEFITS DURING THE ACCUMULATION PERIOD
- --------------------------------------------------------------------------------
 
If you were to die before the Annuity Commencement Date, we will pay a death
benefit to your Beneficiary. If you have an Eligible Spouse, your Eligible
Spouse will be the Beneficiary unless the spouse has consented in writing to the
designation of another Beneficiary.
 
The amount of the death benefit will be your Account Balance as of the date we
receive proof of death and the election of the Beneficiary(ies) designating how
we should pay the death benefit. The Beneficiary will select the form of death
benefit, which may be a lump sum, a form of annuity or fixed payments. REFER TO
"OUR PAYMENT OF ACCOUNT BALANCE TO YOU OR A BENEFICIARY--DEATH BENEFIT PRIOR TO
ANNUITY COMMENCEMENT DATE" AND "FEDERAL TAX INFORMATION FOR PARTICIPANTS".
 
ANNUITY COMMENCEMENT DATE AND AMOUNT OF MONTHLY PAYMENT
- --------------------------------------------------------------------------------
 
You may select the Annuity Commencement Date. You must have reached the age of
55 to begin receiving Annuity Payments, unless the Annuity Payments are under a
Qualified Joint and Survivor Annuity form when the Participant's Eligible Spouse
is the Joint Annuitant. The Annuity Payments will be fixed at the same amount
every month and will be based on your Account Balance at the Annuity
Commencement Date and the form of annuity you select. Each Contract contains
tables of annuity purchase rates. We guarantee that the monthly amount of the
Annuity Payments, for the form of annuity selected, will never be less favorable
for an Annuitant than the guaranteed rate in the Contract. REFER TO "YOU MAY
OBTAIN AN ANNUITY WITH YOUR ACCOUNT BALANCE".
 
FORMS OF ANNUITY AVAILABLE.  We offer several forms of annuity, some of which
have guaranteed minimum time periods for payments. You will be the Annuitant and
may name another person as the joint Annuitant. If you were to die (and the
joint Annuitant dies, if the form is a joint and survivor annuity) before the
minimum period has ended, the Beneficiary will receive any remaining Annuity
Payments due. A life annuity protects you from outliving the time period for
receiving monthly payments, because the payments continue for your life.
 
You may select the annuity form when you designate the Annuity Commencement
Date. If you are married, you and your Eligible Spouse will receive a joint and
survivor annuity, unless your spouse consents in writing to another form of
annuity. Refer to "You May Obtain an Annuity with Your Account
Balance--Available Forms of Annuity".
 
                                       6
<PAGE>
CANCELLATION RIGHT
- --------------------------------------------------------------------------------
 
You may surrender for cancellation a 403(b) Thrift Plan Certificate within ten
days after you have received it (or within a longer period if your State
requires it). We will refund all Contributions you allocated to the General
Account, plus the value on the surrender date of your Account Balance allocated
to the Separate Account, unless your State requires that all Contributions to
the Separate Account be refunded.
                ABOUT MUTUAL OF AMERICA AND THE SEPARATE ACCOUNT
- --------------------------------------------------------------------------------
 
We are a mutual life insurance company organized under the laws of the State of
New York. We are authorized to transact business in 50 states and the District
of Columbia. Our home office address is 320 Park Avenue, New York, New York
10022. The Insurance Company was incorporated in 1945 as a nonprofit retirement
association to provide retirement and other benefits for non-profit
organizations and their employees in the health and welfare field. In 1978 we
reorganized as a mutual life insurance company.
 
We provide group and individual annuities and related services for the pension,
retirement, and long-range savings needs of non-profit, social welfare,
charitable, religious, educational and government organizations and their
employees. We invest the assets we derive from our business as permitted under
applicable state law. As of December 31, 1998, we had total assets, on a
consolidated basis, of approximately $10.1 billion. We are registered as a
broker-dealer under the Securities Exchange Act of 1934, and also are registered
as an investment adviser under the Investment Advisers Act of 1940.
 
Our operations as a life insurance company are reviewed periodically by various
independent rating agencies. These agencies, such as A.M. Best Company, Standard
& Poor's Insurance Rating Service and Duff & Phelps Credit Rating Company,
publish their ratings. From time to time we reprint and distribute the rating
reports in whole or in part, or summaries of them, to the public. The ratings
concern our operation as a life insurance company and do not imply any
guarantees of performance of the Separate Account.
 
OUR SEPARATE ACCOUNT
- --------------------------------------------------------------------------------
 
We established the Separate Account under a resolution adopted by our Board of
Directors on September 22, 1983. The Separate Account is registered with the
Securities and Exchange Commission (COMMISSION) as a unit investment trust under
the Investment Company Act of 1940 (1940 ACT). The Commission does not supervise
the management or investment practices or policies of the Separate Account or
Mutual of America. The 1940 Act, however, does regulate certain actions by the
Separate Account.
 
We divide the Separate Account into distinct Funds. Each Fund invests its assets
in an Underlying Fund, and the name of each Separate Account Fund reflects the
name of the corresponding Underlying Fund.
 
The assets of the Separate Account are our property. The Separate Account assets
attributable to Participants' Account Balances and any other annuity contracts
funded through the Separate Account cannot be charged with liabilities from
other businesses that we conduct. The income, capital gains and capital losses
of each Fund of the Separate Account are credited to, or charged against, the
net assets held in that Fund. We separately determine each Fund's net assets,
without regard to the income, capital gains and capital losses from any of the
other Funds of the Separate Account or from any other business that we conduct.
 
The Separate Account and Mutual of America are subject to supervision and
regulation by the Superintendent of Insurance of the State of New York, and by
the insurance regulatory authorities of each State.
 
                                       7
<PAGE>
OTHER VARIABLE ANNUITY CONTRACTS WE ISSUE
- --------------------------------------------------------------------------------
 
In addition to the Contracts described in this Prospectus, we offer other
individual and group variable annuity contracts, some of which are not described
in this Prospectus but which also participate in the Separate Account.
              UNDERLYING FUNDS INVESTED IN BY OUR SEPARATE ACCOUNT
- --------------------------------------------------------------------------------
 
Below are summaries of the Underlying Funds' investment objectives and certain
investment policies. The Underlying Funds sell their shares to the separate
accounts of insurance companies and do not offer them for sale to the general
public.
 
You will find more detailed information about the Underlying Funds in their
current prospectuses, which are attached to this Prospectus. You should read
each prospectus for a complete evaluation of the Underlying Funds, their
investment objectives, principal investment strategies and the risks related to
those strategies.
 
EQUITY INDEX FUND OF THE INVESTMENT COMPANY
- --------------------------------------------------------------------------------
 
The investment objective of the Equity Index Fund is to provide investment
results that correspond to the performance of the Standard & Poor's Composite
Index of 500 Stocks (the S&P 500 INDEX-Registered Trademark-).* The Fund invests
primarily in common stocks that are included in the S&P 500 Index.
 
ALL AMERICA FUND OF THE INVESTMENT COMPANY
- --------------------------------------------------------------------------------
 
The investment objective of the All America Fund is to outperform the S&P 500
Index by investing in a diversified portfolio of primarily common stocks.
 
The Fund invests approximately 60% of its assets (the INDEXED ASSETS) to provide
investment results that correspond to the performance of the S&P 500 Index. The
Fund invests the remaining approximately 40% of its assets (the ACTIVE ASSETS)
to seek to achieve a high level of total return, through both appreciation of
capital and, to a lesser extent, current income, by means of a diversified
portfolio of primarily common stocks with a broad exposure to the market.
 
MID-CAP EQUITY INDEX FUND OF THE INVESTMENT COMPANY
- --------------------------------------------------------------------------------
 
The investment objective of the Mid-Cap Equity Index Fund is to provide
investment results that correspond to the performance of the S&P MidCap 400
Index-Registered Trademark-.* The Fund invests primarily in common stocks that
are included in the S&P MidCap 400 Index.
 
AGGRESSIVE EQUITY FUND OF THE INVESTMENT COMPANY
- --------------------------------------------------------------------------------
 
The investment objective of the Aggressive Equity Fund is capital appreciation,
by investing approximately 50% of its assets in companies believed to possess
above-average growth potential and approximately 50% of its assets in companies
believed to possess valuable assets or whose securities are undervalued in the
marketplace in relation to factors such as the company's assets, earnings or
growth potential. In utilizing the investment styles of growth and value stock
selection, the Adviser anticipates that the percentage of the Fund's assets in
either category will range between 40% and 60%.
 
- ------------------------
* Standard & Poor's, S&P, S&P 500 and S&P MidCap 400 are trademarks of The
  McGraw-Hill Companies, Inc. and have been licensed for use by the Investment
  Company. Standard & Poor's does not sponsor, endorse, sell or promote the
  Equity Index Fund, All America Fund or Mid-Cap Equity Index Fund. It has no
  obligation or liability for the sale or operation of the Funds and makes no
  representations as to the advisability of investing in the Funds.
 
                                       8
<PAGE>
COMPOSITE FUND OF THE INVESTMENT COMPANY
- --------------------------------------------------------------------------------
 
The investment objective of the Composite Fund is to achieve as high a total
rate of return, through both appreciation of capital and current income, as is
consistent with prudent investment risk by means of a diversified portfolio of
publicly-traded common stocks, debt securities and money market instruments. The
Fund seeks to achieve long-term growth of its capital and increasing income by
investments in common stock and other equity-type securities, and a high level
of current income through investments in publicly-traded debt securities and
money market instruments.
 
BOND FUND OF THE INVESTMENT COMPANY
- --------------------------------------------------------------------------------
 
The primary investment objective of the Bond Fund is to provide as high a level
of current income over time as is believed to be consistent with prudent
investment risk. A secondary objective is preservation of capital.
 
The Bond Fund seeks to achieve its objective by investing primarily in
investment grade, publicly-traded debt securities, such as bonds, U.S.
Government and agency securities, including mortgage-backed securities, and zero
coupon securities. The Bond Fund may invest to a limited extent in lower-rated
or unrated securities.
 
MID-TERM BOND FUND OF THE INVESTMENT COMPANY
- --------------------------------------------------------------------------------
 
The primary investment objective of the Mid-Term Bond Fund is to provide as high
a level of current income over time as is believed to be consistent with prudent
investment risk. A secondary objective is preservation of capital. The average
maturity of the Fund's securities holdings will be between three and seven
years.
 
The Mid-Term Bond Fund seeks to achieve its objective by investing primarily in
investment grade, publicly-traded debt securities, such as bonds, U.S.
Government and agency securities, including mortgage-backed securities, and zero
coupon securities.
 
SHORT-TERM BOND FUND OF THE INVESTMENT COMPANY
- --------------------------------------------------------------------------------
 
The primary investment objective of the Short-Term Bond Fund is to provide as
high a level of current income over time as is believed to be consistent with
prudent investment risk. A secondary objective is preservation of capital. The
average maturity of the Fund's securities holdings will be between one and three
years.
 
The Short-Term Bond Fund seeks to achieve its objective by investing primarily
in investment grade, publicly-traded debt securities, such as bonds, U.S.
Government and agency securities, including mortgage-backed securities, and in
money market instruments.
 
MONEY MARKET FUND OF THE INVESTMENT COMPANY
- --------------------------------------------------------------------------------
 
The investment objective of the Money Market Fund is the realization of high
current income to the extent consistent with the maintenance of liquidity,
investment quality and stability of capital.
 
The Money Market Fund invests only in money market instruments and other
short-term securities. NEITHER THE FEDERAL DEPOSIT INSURANCE CORPORATION NOR ANY
OTHER AGENCY OF THE U.S. GOVERNMENT INSURES OR GUARANTEES THE SEPARATE ACCOUNT'S
INVESTMENT IN SHARES OF THE MONEY MARKET FUND.
 
SCUDDER CAPITAL GROWTH PORTFOLIO
- --------------------------------------------------------------------------------
 
The investment objective of Scudder Capital Growth Portfolio is to maximize
long-term capital growth through a broad and flexible investment program.
 
                                       9
<PAGE>
The Portfolio invests in marketable securities, principally common stocks and,
consistent with its objective of long-term capital growth, preferred stocks. The
Portfolio may invest up to 25% of its assets in short-term debt instruments,
depending on market and economic conditions.
 
SCUDDER BOND PORTFOLIO
- --------------------------------------------------------------------------------
 
The investment objective of the Scudder Bond Portfolio is to invest for a high
level of income consistent with a high quality portfolio of debt securities.
 
To attempt to achieve its objective, the Portfolio invests principally in
investment grade bonds, including those issued by the U.S. Government and its
agencies and by corporations, and other notes and bonds paying high current
income. The Portfolio may invest up to 20% of its assets in non-investment grade
debt securities.
 
SCUDDER INTERNATIONAL PORTFOLIO
- --------------------------------------------------------------------------------
 
The investment objective of the Scudder International Portfolio is long-term
growth of capital primarily through diversified holdings of marketable foreign
equity investments.
 
The Portfolio invests primarily in equity securities of established companies
that do business primarily outside the United States and that are listed on
foreign exchanges. In the event of exceptional conditions abroad, the Portfolio
may temporarily invest all or a portion of its assets in Canadian or U.S.
Government obligations or currencies, or securities of companies incorporated in
and having their principal activities in Canada or the United States.
 
FIDELITY VIP EQUITY-INCOME PORTFOLIO
- --------------------------------------------------------------------------------
 
The investment objective of the Equity-Income Portfolio is reasonable income by
investing primarily in income-producing equity securities. In choosing these
securities, the Portfolio also considers the potential for capital appreciation.
The Portfolio's goal is to achieve a yield that exceeds the composite yield on
the securities comprising the S&P 500 Index.
 
FIDELITY VIP II CONTRAFUND PORTFOLIO
- --------------------------------------------------------------------------------
 
The investment objective of the Contrafund Portfolio is capital appreciation. It
seeks to increase the value of an investment in the Portfolio over the long term
by investing mainly in securities of companies whose value its adviser believes
is not fully recognized by the public. These securities may be issued by
domestic or foreign companies and many may not be well known. The Portfolio
normally invests primarily in common stocks.
 
FIDELITY VIP II ASSET MANAGER PORTFOLIO
- --------------------------------------------------------------------------------
 
The investment objective of the Asset Manager Portfolio is high total return
with reduced risk over the long term by allocating its assets among domestic and
foreign stocks, bonds and short-term and money market instruments.
 
The Portfolio's adviser normally allocates the Portfolio's assets among the
three asset classes within the following investment parameters: 0-50% in
short-term/money market instruments; 20-60% in bonds; and 30-70% in stocks. The
expected "neutral mix", which the Portfolio's adviser would expect over the long
term, is 10% in short-term/money market instruments, 40% in bonds and 50% in
stocks.
 
CALVERT SOCIAL BALANCED PORTFOLIO
- --------------------------------------------------------------------------------
 
The investment objective of Calvert Social Balanced Portfolio is to achieve a
competitive total return through an actively managed non-diversified portfolio
of stocks, bonds and money market instruments that offer income and capital
growth opportunity and satisfy the social concern criteria established for the
Portfolio.
 
                                       10
<PAGE>
AMERICAN CENTURY VP CAPITAL APPRECIATION FUND
- --------------------------------------------------------------------------------
 
The investment objective of the American Century VP Capital Appreciation Fund is
capital growth by investing primarily in common stocks that meet certain
fundamental and technical standards of selection and have, in the opinion of the
Fund's manager, better-than-average prospects for appreciation.
 
INVESTMENT ADVISERS FOR THE UNDERLYING FUNDS
- --------------------------------------------------------------------------------
 
MUTUAL OF AMERICA INVESTMENT CORPORATION: The Investment Company receives
investment advice from Mutual of America Capital Management Corporation (the
ADVISER), an indirect wholly-owned subsidiary of Mutual of America. For the
Active Assets of the All America Fund, the Adviser has entered into subadvisory
agreements with Palley-Needelman Asset Management, Inc., Oak Associates, Ltd.
and Fred Alger Management, Inc. Each of these subadvisers provides investment
advice for approximately 10% of the net assets of the All America Fund.
 
SCUDDER VARIABLE LIFE INVESTMENT FUND: The Scudder Capital Growth, Bond and
International Portfolios receive investment advice from Scudder Kemper
Investments, Inc.
 
FIDELITY PORTFOLIOS: The Equity-Income Portfolio, Contrafund Portfolio and Asset
Manager Portfolio receive investment advice from Fidelity Management & Research
Company.
 
CALVERT SOCIAL BALANCED PORTFOLIO: The Portfolio receives investment advice from
Calvert Asset Management Company, Inc., which has entered into a subadvisory
agreement with NCM Capital Management Group, Inc. for the equity portion of the
Portfolio.
 
AMERICAN CENTURY VP CAPITAL APPRECIATION FUND: The Fund receives investment
advice from American Century Investment Management, Inc.
 
SHARED AND MIXED FUND ARRANGEMENTS. Shares of the Fidelity Portfolios, the
Scudder Portfolios, the American Century VP Capital Appreciation Fund and the
Calvert Social Balanced Portfolio (together, the SHARED FUNDS) currently are
available to the separate accounts of a number of insurance companies. Shares of
Mutual of America Investment Corporation and shares of certain of the Shared
Funds (together, the MIXED FUNDS) currently are available to separate accounts
for both variable annuity and variable life insurance products.
 
The Board of Directors (or Trustees) of each Shared and Mixed Fund is
responsible for monitoring that Fund for the existence of any material
irreconcilable conflict between the interests of participants in all separate
accounts that invest in the Fund. The Board must determine what action, if any,
the Shared Fund should take in response to an irreconcilable conflict. If we
believe that a response does not sufficiently protect our Contractholders or
Participants, we will take appropriate action, and we may modify or reduce the
Investment Alternatives available to you.
 
                                       11
<PAGE>
                     CHARGES YOU OR YOUR EMPLOYER WILL PAY
- --------------------------------------------------------------------------------
 
ADMINISTRATIVE CHARGES
- --------------------------------------------------------------------------------
 
We perform all administrative functions in connection with the Contracts,
including receiving and allocating Contributions, making Annuity Payments as
they become due, and preparing and filing all reports that the Separate Account
is required to file. The expenses we incur for administrative functions include,
but are not limited to, items such as state or other taxes, salaries, rent,
postage, telephone, travel, office equipment, costs of outside legal, actuarial,
accounting and other professional services, and costs associated with
determining the unit values of the Separate Account Funds.
 
We may increase or decrease the daily and monthly administrative charges
described below, subject to any limitations in the Contract or a Plan. The
aggregate fees and charges we impose under the Contracts must be reasonable in
relation to the services we provide, the expenses we expect to incur, and the
risks we have assumed.
 
SEPARATE ACCOUNT CHARGE.  We deduct, on each Valuation Day, from the value of
the net assets in each Fund of the Separate Account a charge for administrative
expenses.
 
   -   For each Fund, the charge is at an annual rate of 0.40%, except that
       we reduce the charge to the extent we receive a reimbursement for
       administrative expenses from an Underlying Fund's service provider.
 
   -   For the Separate Account Fund that invests in the American Century VP
       Capital Appreciation Fund, the annual rate currently is 0.20%, because
       the adviser for the American Century VP Capital Appreciation Fund
       reimburses us at an annual rate of up to 0.20% for administrative
       expenses.
 
   -   For the Funds that invest in the Fidelity Portfolios, the annual rate
       currently is 0.30%, because the transfer agent and distributor for the
       Fidelity Portfolios reimburse us at an aggregate annual rate of 0.10%
       for administrative expenses.
 
PARTICIPANT CHARGE.  We make an additional deduction for administrative expenses
each month from each Participant's Account Balance, unless the Employer has
elected to pay this charge on behalf of its Participants. The monthly charge is
the LESSER of:
 
   -   $2.00 per month, and
 
   -   1/12 of 1.00% of your Account Balance, which will apply if your
       Account Balance for the month is less than $2,400.
 
We waive your Participant charge for a month if:
 
   -   you are paying the monthly charge under another 403(b) or Tax Deferred
       Annuity account with us, or
 
   -   your Employer uses our Hotline System and during that month the
       Employer's Contract assets were $5 million or more or there were 500
       or more active Participants in the Plan.
 
We deduct the monthly charge from your Account Balance allocated to the General
Account, if any. If you do not have any Account Balance in the General Account,
we will deduct the charge from your Account Balance allocated to one or more of
the Separate Account Funds, in a prescribed order we have established. (You
should refer to the Statement of Additional Information for the order of the
Funds.)
 
DISTRIBUTION EXPENSE CHARGE
- --------------------------------------------------------------------------------
 
As principal underwriter, we perform all distribution and sales functions and
bear all distribution and sales expenses relative to the Contracts. These
expenses include the payment of that portion of the salaries of our registered
representatives attributable to the sale and distribution of Contracts, as well
as expenses for preparation of sales literature and other promotional
activities.
 
We deduct, on each Valuation Day, from the net assets in each Fund of the
Separate Account a charge at an annual rate of .35% to cover anticipated
distribution expenses.
 
MORTALITY AND EXPENSE RISK CHARGES
- --------------------------------------------------------------------------------
 
We have certain mortality and expense risks under the Contracts. The mortality
risk we assume arises from our guarantee to make Annuity Payments in accordance
with the annuity tables provided in a Contract, regardless of how long an
Annuitant lives or of any improvement in life expectancy generally.
 
                                       12
<PAGE>
Our mortality risk is that Annuitants as a class will live longer than we had
estimated actuarially, and as a result we make Annuity Payments for longer than
we had anticipated. This assumption of risk by us relieves Participants
(Annuitants) of the risk that they will outlive the funds that they have
accumulated for their retirement.
 
We assume certain expense risks under the Contracts. The expense risks we assume
arise from our guarantees in the Contracts to make Annuity Payments in
accordance with annuity tables in the Contracts. We have estimated expenses we
expect to incur over the lengthy period that we may make Annuity Payments. We
assume the risk that expenses will be higher than we estimated.
 
On each Valuation Day:
 
   -   for assuming the mortality risks we make a deduction at an annual rate
       of 0.35% of the net assets in each Fund, and
 
   -   for assuming the expense risks we make a deduction at an annual rate
       of 0.15% of the net assets in each Fund.
 
We guarantee that we will not increase the mortality risk charge during the life
of a Contract, and we have the right to increase the expense risk charge,
subject to any limitations in a Plan or the Contract.
 
EMPLOYER CHARGES
- --------------------------------------------------------------------------------
 
MONTHLY CHARGE.  We charge an Employer a $100 per month contract charge for
various administrative expenses that we incur in providing Plan-related
services. If we maintain separate records for affiliated Employers at different
locations, we also impose a monthly contract charge of $50 (50% of the basic
contract charge) for each affiliate. The Plan-related services we provide
include, among other services:
 
   -   assistance with preparation of summary plan description documents,
       plan documents or amendments, and
 
   -   kits for Annual Return/Report (Form 5500 Series) filings and for
       non-discrimination testing applicable to salary reduction and matching
       Contributions.
 
If an Employer elects to use a modified services arrangement under a Contract,
we waive the monthly contract charge. We also waive the charge for an Employer
for so long as its total Contract assets exceed $1 million and the Employer is
using our Hotline system.
 
PER PARTICIPANT MONTHLY CHARGE.  We charge an Employer a monthly charge for each
active Participant. The charge is $4.00 for each of the first 50 Participants;
$2.00 for each of the next 50 Participants; $1.00 for each of the next 100
Participants; and no charge for Participants in excess of 200. We waive this
charge for an Employer who elects to use a modified services arrangement under
the Contract. We also waive the charge for an Employer for each month in which
its total Contract assets exceed $1 million and the Employer is using our
Hotline system.
 
NONVESTED FORFEITURE PROCESSING CHARGE.  We impose a charge when a Participant
terminates employment and the Participant's Account Balance was partially
vested. The charge is equal to the lesser of $50 or the value of the nonvested
Account Balance. We deduct the charge from the nonvested portion of your Account
Balance before we process the forfeiture in accordance with the Plan. We limit
the number of Participants under a Contract for whom we impose the nonvested
forfeiture processing charge to 50 in any calendar year.
 
EXPENSES OF THE UNDERLYING FUNDS
- --------------------------------------------------------------------------------
 
Participants and the Separate Account Funds do not directly pay the advisory
fees and other expenses of the Underlying Funds. These fees and expenses are
deducted by the Underlying Funds and will impact the value of the shares the
Separate Account Funds own. SEE "Table of Annual Expenses" in this Prospectus,
which shows the expenses of the Underlying Funds for the most recent calendar
year. The prospectuses of the Underlying Funds, which are attached to this
Prospectus, contain a complete description of the Underlying Funds' fees and
expenses.
 
PREMIUM TAXES
- --------------------------------------------------------------------------------
 
We currently do not deduct state premium taxes from your or your employer's
Contributions. We reserve the right to deduct all or a portion of the amount of
any applicable taxes, including state premium taxes, from Contributions prior to
their allocation among the Investment Alternatives. Currently, most state
premium taxes range from 2% to 4%.
 
                                       13
<PAGE>
               WHO MAY PURCHASE A CONTRACT AND MAKE CONTRIBUTIONS
- --------------------------------------------------------------------------------
 
PURCHASE OF A CONTRACT; PARTICIPATION
- --------------------------------------------------------------------------------
 
403(b) THRIFT PLAN CONTRACTS.  A Contractholder must be a tax-exempt
organization under Section 501(c)(3) of the Code or an eligible public school or
college, or an association that represents such a tax-exempt organization or
eligible public school or college or its employees. The Contract must fund
annuity purchase arrangements that meet the requirements of Section 403(b) of
the Code.
 
401(a) THRIFT PLAN CONTRACTS, INCLUDING 401(k) PLAN CONTRACTS.  A 401(a) or
401(k) Thrift Plan Contractholder must be an employer, an employer association
or a trust for one or more employers, that has adopted a retirement plan
qualifying for special Federal income tax treatment under Section 401(a) of the
Code, including Section 401(k). The employer(s) must be in the not-for-profit
field (including governmental entities).
 
PARTICIPATION.  Each Plan specifies the eligibility requirements for an
employee's participation, which may include requirements for minimum age or
years of service. We or the Plan may require you to execute agreements and
applications on their prescribed forms, including a salary reduction agreement
or payroll deduction agreement with the Employer.
 
ACCEPTANCE OF INITIAL CONTRIBUTIONS.  When we receive your enrollment form and
initial Contribution (when required), together with any other necessary
information, we will accept them and apply the Contribution to your specified
Investment Alternatives, or reject them, within two business days of receipt. If
you did not properly complete the enrollment form, we will retain the
Contribution for up to five business days while we attempt to obtain the
information necessary to complete the form. We will accept the Contribution
within two business days after we receive the completed enrollment form. If we
do not receive a completed enrollment form for you within five business days, we
will return the Contribution at the end of that period unless we obtain consent
from you to hold the Contribution for a longer period or we notify your Employer
on your behalf of the incomplete information. We enter into agreements with
Employers that use our electronic processing system for the forwarding of
enrollment form information and Contributions to us by the Employers.
 
CANCELLATION OF 403(b) CERTIFICATE.  You may surrender a 403(b) Thrift Plan
Certificate for cancellation within ten days after receipt. We will refund all
Contributions you allocated to the General Account, plus the value on the date
of surrender of your Account Balance credited to the Separate Account. Several
states, however, require that the amount of Contributions be refunded without
deductions, and you should consult the Contract for applicable provisions. We
will return to your employer any Contributions that were sent to us by your
employer on your behalf.
 
PAYMENT OF CONTRIBUTIONS
- --------------------------------------------------------------------------------
 
Your Contributions, if the Plan permits this type of Contributions, are from:
 
   -   salary reduction arrangements under a 403(b) Thrift Plan or 401(k)
       Thrift Plan, or
 
   -   payroll deductions under a 401(a) Thrift Plan.
 
When we issue a Contract to an Employer, the Employer sends Contributions
directly to us. If a Plan provides for trustees, we issue a Contract to the Plan
trustees and the Employer sends Contributions to the trustees, who then send us
trust assets (the amount of the Contributions). An Employer (or trustees) sends
to us Contributions on behalf of Participants, as follows.
 
   -   The Employer must remit to us (or to trustees of the Plan, if any)
       your Contributions as soon as administratively reasonable but no later
       than 15 days after the end of the month in which the Employer
       collected the Contributions by salary reduction or payroll deduction.
 
   -   An Employer (or trustees) may remit to us on your behalf an amount, in
       a single sum, that arises from a transfer from any Plan the Employer
       maintains, as long as the transfer is permitted by applicable law and
       the Contract.
 
   -   Remittances to us of the Employer's Contributions (if any) generally
       must be made as required by the Plan and permitted by the Code. An
       Employer's Contributions on your behalf may be subject to a vesting
       schedule specified in the Plan. An Employer's Contributions, if made,
       are either:
 
                                       14
<PAGE>
       DIAMOND"matching", with the Employer contributing a fixed
              percentage, such as 25%, 50% or 100%, of all or a portion of
              your Contribution (up to a specified amount), or
 
       DIAMOND"nonmatching", in an amount the Employer determines, as
              limited by the Plan and the Code.
 
We will not accept Contributions for you if you have terminated participation
under a Contract or if your Contract has been discontinued. See "Discontinuance
of a Contract" below.
 
MINIMUM.  A Plan may provide that your Contributions may not be less than $200
annually.
 
LIMITS ON CONTRIBUTIONS
- --------------------------------------------------------------------------------
 
Federal tax law limits Participants' and Employers' Contributions. If you or
your Employer makes any Contributions in excess of the permitted amounts, then
 
   -   you or your Employer may be subject to tax penalties,
 
   -   the excess may be treated as a forfeiture, and/or
 
   -   the Plan may have to correct the overpayment by distributing the
       excess Contribution, resulting in taxable income to you. SEE "Federal
       Tax Information for Participants".
 
LIMITS FOR 403(b) THRIFT PLANS.  Except for a limited catch-up provision, the
maximum amount that a Participant may contribute generally is $10,000 for 1999
(indexed for inflation in later years). This limit on voluntary, pre-tax
Participant Contributions (or "elective deferrals") is reduced by any other
elective deferrals you make for the year to other employer retirement plans,
including those of a different employer.
 
The total of your Contributions and the Employer's Contributions on your behalf
for a year cannot exceed the "maximum excludable amount". This amount may be
reduced by contributions made to other employer retirement plans. In general
terms, the maximum excludable amount for a year is the LESSER of:
 
   -   (a) $30,000, OR (b) 25% of your compensation (before salary reduction
       contributions), except that compensation for this test is limited to
       $160,000 for 1999 (to be indexed for inflation in later years),
       whichever is less, and
 
   -   (a) 20% of your compensation (before salary reduction contributions),
       multiplied by your years of service, MINUS (b) any amounts contributed
       and excluded from your gross income for any prior taxable year.
       (Special rules and exceptions may allow a larger amount.)
 
You should refer to "Federal Tax Information for Participants--Exclusion of
Contributions from Gross Income--403(b) Thrift Plan Contracts" in this
Prospectus for a more detailed discussion of applicable Federal tax law limits.
 
LIMITS FOR THRIFT PLANS UNDER 401(a).  Your annual contributions to all
qualified defined contribution plans generally are limited to the lesser of
$30,000 or 25% of your annual compensation up to $160,000 in 1999 (indexed for
inflation in later years). If the Employer makes matching contributions, limits
apply to those matching contributions as well. For Thrift Plans subject to Code
Section 401(k), your Contributions are limited to $10,000 for 1999 (to be
indexed for inflation in later years). Additional limits may apply to your
Contributions based on the Contributions of all participating employees. In
addition, all of these limits may be reduced by Contributions you make to other
employer retirement plans.
 
For a Plan that is intended to meet the requirements as a SIMPLE 401(k) Plan,
the limit for your Contributions is reduced to $6,000 per year (indexed for
inflation for years after 1999), and the Employer is required to make
Contributions at specified rates.
 
ALLOCATION OF CONTRIBUTIONS
- --------------------------------------------------------------------------------
 
You may allocate Contributions among the General Account and the Funds of the
Separate Account, except that your Plan may restrict any nonvested portion of
your Account Balance to the General Account. The Mid-Cap Equity Index Fund may
not be available to Participants in all States, due to state insurance
department regulatory filings.
 
We will allocate a Contribution when we receive it from you or your Employer
according to instructions sent with the Contribution, or if no instructions are
sent, on the basis of your allocation request currently on file at our home
office. Your request for allocation must specify the percentage, in any whole
 
                                       15
<PAGE>
percentage from 0% to 100%, of each Contribution to be allocated to each of the
Investment Alternatives. The percentages you give us must add up to 100%.
 
You may change the allocation instructions for future Contributions from time to
time. You should periodically review your allocations in light of market
conditions and your financial and retirement plans.
               YOUR ACCOUNT BALANCE IN THE SEPARATE ACCOUNT FUNDS
- --------------------------------------------------------------------------------
 
ACCUMULATION UNITS IN SEPARATE ACCOUNT FUNDS
- --------------------------------------------------------------------------------
 
We use Accumulation Units to represent Account Balances in each Separate Account
Fund. We separately value the Accumulation Unit for each Fund of the Separate
Account.
 
We determine your Account Balance in the Separate Account as of any Valuation
Day by multiplying the number of Accumulation Units credited to you in each Fund
of the Separate Account by the Accumulation Unit value of that Fund at the end
of the Valuation Day.
 
Investment experience by the Separate Account Funds does not impact the number
of Accumulation Units credited to your Account Balance. The value of an
Accumulation Unit for a Fund, however, will change as a result of the Fund's
investment experience, in the manner described below.
 
CALCULATION OF ACCUMULATION UNIT VALUES
- --------------------------------------------------------------------------------
 
We determine Accumulation Unit values for the Funds as of the close of business
on each Valuation Day (generally at the close of the New York Stock Exchange). A
Valuation Period is from the close of a Valuation Day until the close of the
next Valuation Day.
 
The dollar value of an Accumulation Unit for each Fund of the Separate Account
will vary from Valuation Period to Valuation Period. The changes in Accumulation
Unit values for the Separate Account Funds will reflect:
 
   -   changes in the net asset values of the Underlying Funds, depending on
       the investment experience and expenses of the Underlying Funds, and
 
   -   Separate Account charges under the Contracts, with the annual rates
       calculated as a daily charge. (SEE "Charges You or Your Employer Will
       Pay".)
 
You may refer to "Appendix A: Unit Value Information for the Separate Account
Funds" in this Prospectus to review changes in Accumulation Unit values for each
Fund over a period of time (except for the Mid-Cap Equity Index Fund, which
began operations on May 1, 1999).
 
ACCUMULATION UNIT VALUES FOR TRANSACTIONS
- --------------------------------------------------------------------------------
 
When you allocate Contributions to a Separate Account Fund or transfer Account
Balance to a Fund, we credit Accumulation Units to your Account Balance. When
you withdraw or transfer Account Balance from a Separate Account Fund, we cancel
Accumulation Units from your Account Balance.
 
The Accumulation Unit value for a transaction is the Unit value for the
Valuation Period during which we receive the deposit or request. As a result, we
will effect the transaction at the Accumulation Unit value we determine at the
NEXT CLOSE of a Valuation Day (generally the close of the New York Stock
Exchange on that business day).
 
We calculate the number of Accumulation Units for a particular Fund by dividing
the dollar amount you have allocated to, or withdrawn from, the Fund during the
Valuation Period by the applicable Accumulation Unit value for that Valuation
Period. We round the resulting number of Accumulation Units to two decimal
places.
 
                                       16
<PAGE>
             OUR PAYMENT OF ACCOUNT BALANCE TO YOU OR A BENEFICIARY
- --------------------------------------------------------------------------------
 
YOUR RIGHT TO TRANSFER AMONG INVESTMENT ALTERNATIVES
- --------------------------------------------------------------------------------
 
You may transfer all or a portion of your Account Balance among Funds of the
Separate Account, and between the Separate Account and the General Account,
unless your Plan limits transfers. There are no tax consequences to you for
transfers among Investment Alternatives. We currently do not impose a charge for
transfers, but we reserve the right to impose a transfer charge in the future.
 
YOUR RIGHT TO MAKE WITHDRAWALS, INCLUDING BY SPECIFIED PAYMENTS
- --------------------------------------------------------------------------------
 
Your right to withdraw Account Balance is restricted by Federal tax law and the
provisions of the applicable Plan. Once you have the right to make withdrawals,
you may withdraw all or a portion of your Account Balance. If you are married,
your Eligible Spouse usually must consent to any withdrawals. We may take up to
seven days following receipt of your withdrawal request to process the request
and mail a check to you.
 
403(b) THRIFT PLANS AND 401(k) THRIFT PLANS.  If you are under age 59 1/2,
Federal tax law provisions prohibit you from withdrawing the portion of your
Account Balance that is attributable to your own salary reduction Contributions
and the earnings on those Contributions, except in certain circumstances, such
as death, disability or termination of your employment. If you are under age
59 1/2 and meet certain conditions under the Code, you may be able to withdraw
Contributions, but not the earnings on them, if you incur a financial hardship.
For 403(b) Thrift Plans, these Federal tax law restrictions on withdrawals do
not apply to any of your Contributions made before 1989 and earnings credited
before 1989 on your Contributions.
 
An Employer's Plan may impose restrictions on your ability to withdraw your
Contributions or the Employer's Contributions, or both, which are in addition to
the Federal tax law restrictions. For example, a Plan may prohibit you from
making any withdrawals until you terminate employment, or until you have reached
age 59 1/2 or completed 5 years of participation in the Plan. If an Employer's
Plan permits you to withdraw the Employer's Contributions before you terminate
employment, you may not withdraw any of the Employer's Contributions and
earnings thereon that are not fully vested to you.
 
401(a) THRIFT PLANS.  Federal tax law provisions permit you to withdraw Account
Balance if your Employer's Plan is a profit-sharing plan and does not permit you
to make before-tax Contributions. The withdrawal rules for other Thrift 401(a)
Plans are generally the same as the 401(k) Thrift rules described above (except
that there are no salary reduction Contributions). If your Employer's Plan is a
defined contribution pension plan (not a profit-sharing plan), then you may not
withdraw Account Balance until you terminate employment with the Employer.
 
An Employer's Plan may impose restrictions on withdrawals, such as prohibiting
you from making any withdrawals until you terminate employment, or until you
have reached age 59 1/2 or completed 5 years of participation in the Plan. If an
Employer's Plan permits you to withdraw the Employer's Contributions before you
terminate employment, you may not withdraw any of the Employer's Contributions
and earnings thereon that are not fully vested to you.
 
SPECIFIED PAYMENTS OPTION.  If you have reached the age of 59 1/2 or you have
terminated employment with your Employer and reached age 55 and you are
permitted to make withdrawals under the Plan, you may elect to make partial
withdrawals of Account Balance by telling us a set amount to be withdrawn each
month, under our Specified Payments Option. You must specify an amount, which
may not be less than $100, and must tell us the Investment Alternatives from
which the withdrawals should be taken.
 
When you are receiving Specified Payments, you and your Employer may continue to
make Contributions on your behalf. You also may transfer Account Balance among
Investment Alternatives and make other withdrawals when receiving Specified
Payments.
 
Specified Payments will continue until the earliest of:
 
   -   your death;
 
                                       17
<PAGE>
   -   our receipt of your written request to change or end the Specified
       Payments;
 
   -   a decline in your Account Balance (or in any Investment Alternative
       designated for withdrawals) so that the remaining balance is not large
       enough to cover the next Specified Payment due; or
 
   -   your Annuity Commencement Date.
 
If you are subject to the minimum distribution rules under the Code, you should
ensure that the Specified Payments for the year equal or exceed your minimum
required annual distribution. See "Federal Tax Information for
Participants--Minimum Required Distributions."
 
INCOME TAX CONSEQUENCES.  You should consider the possible Federal income tax
consequences of any withdrawal, including withdrawals under the Specified
Payments Option. You are taxed at ordinary income tax rates on the portion of
the withdrawal that is taxable. A Thrift Plan Participant will not be taxed on
the amount of any Contributions made with "after-tax" dollars, but there are
special rules under the Code for determining whether a withdrawal, or portion of
a withdrawal, will be considered a return to you of after-tax Contributions (SEE
"Federal Tax Information for Participants").
 
PENALTY TAX ON TAXABLE AMOUNT.  There is a 10% Federal penalty tax on the
taxable amount of your withdrawals, unless you have reached the age of 59 1/2,
are disabled or have died, or the distributions are Annuity Payments over your
life (or life expectancy) or over the joint lives (or joint life expectancies)
of you and the Beneficiary, or in certain other circumstances.
 
HOW TO TELL US AN AMOUNT TO TRANSFER OR WITHDRAW
- --------------------------------------------------------------------------------
 
To tell us the amount of your Account Balance to transfer or withdraw, you may
specify to us:
 
   -   the dollar amount to be taken from each Investment Alternative,
 
   -   for Separate Account Funds, the number of Accumulation Units to be
       transferred or withdrawn, or
 
   -   the percentage of your Account Balance in a particular Investment
       Alternative to be transferred or withdrawn.
 
For transfers, you also must specify the Investment Alternative(s) to which you
are moving the transferred amount. Your request for a transfer or withdrawal is
not binding on us until we receive all information necessary to process your
request.
 
LOANS
- --------------------------------------------------------------------------------
 
We make available to an Employer a loan option. If your Employer elects to adopt
the loan provision, you have the right to borrow funds using your Account
Balances as collateral. The amount of the loan permitted is governed by Section
72(p) of the Code and the Contract terms. We will transfer an amount sufficient
to serve as loan collateral from the Separate Account to the General Account
unless you already have allocated the necessary amount of Account Balance to the
General Account. We will not permit you to make withdrawals or transfers of the
collateral amount while the loan is outstanding. There are no tax consequences
to you from obtaining a loan, unless you do not make repayments when they are
due.
 
DEATH BENEFIT PRIOR TO ANNUITY COMMENCEMENT DATE
- --------------------------------------------------------------------------------
 
We will pay a death benefit to your designated Beneficiary upon your death
during the Accumulation Period. If you are married, your Eligible Spouse must be
the Beneficiary unless you designated a different Beneficiary with the written
consent of your spouse.
 
We will pay the death benefit after we have received:
 
   -   due proof of your death;
 
                                       18
<PAGE>
   -   notification of election by the Beneficiary(ies) of the form in which
       we are to pay the death benefit; and
 
   -   all other information and documentation necessary for us to process
       the death benefit request.
 
The amount of the death benefit will be the value of your Account Balance as of
the date on which we receive the items listed above. Until then, your Account
Balance will remain allocated as it was on the date of death (unless the
Beneficiary is the spouse and special rules apply).
 
FORM OF DEATH BENEFIT PAYMENT.  The Beneficiary will elect the form of death
benefit. Payout options include a lump sum payment, annuity payments or
installment payments. The Code imposes special requirements on the payment of a
death benefit and specifies the time period in which we must pay it.
 
In addition, Participants must begin taking minimum distributions after they
reach a certain age (called the REQUIRED BEGINNING DATE), and certain
requirements depend on whether you had reached that age at the time of death.
Beneficiaries should consult their tax advisers for any additional rules that
may apply in their particular circumstances. SEE "Federal Tax Information for
Participants--Minimum Required Distributions".
 
In general, any method of distribution that a Beneficiary selects must comply
with ONE of the following.
 
(a) FIVE YEAR RULE. The general rule is that we must pay the entire death
   benefit to the Beneficiary by December 31 of the year that is five years
   after the Participant's death, unless we pay the benefit under (b), (c), (d)
   or (e) below.
 
(b) LIFE ANNUITY RULE. If a Beneficiary selects a life annuity, the entire death
   benefit must generally be distributed to the Beneficiary in the form of
   Annuity Payments that begin within one year of the Participant's death and
   are payable over a period of time that is not more than the Beneficiary's
   life or life expectancy, whichever is longer.
 
(c) COMMENCEMENT OF MINIMUM DISTRIBUTIONS. If a Participant dies AFTER reaching
   the Required Beginning Date, the method of distribution the Beneficiary
   selects may not be slower than the method of distribution that was in effect
   before the Participant died.
 
(d) ALTERNATIVE METHOD OF DISTRIBUTION. If a Beneficiary withdraws the required
   distribution from another plan of the same type in accordance with applicable
   IRS regulations, the Beneficiary will not be required to receive a
   distribution from a 403(b) Thrift Plan under (a), (b) or (c) above.
 
(e) BENEFICIARY IS THE ELIGIBLE SPOUSE. Special rules apply if the only
   Beneficiary is your surviving Eligible Spouse. The rules apply for both the
   five year rule in (a) and the life annuity rule in (b) above. A Beneficiary
   who is an Eligible Spouse may use your Required Beginning Date for
   determining when minimum distributions must begin. As a consequence, the
   Beneficiary does not have to begin receiving benefits until the April 1
   following the calendar year in which you would have reached age 70 1/2 if
   still alive.
 
DISCONTINUANCE OF A CONTRACT
- --------------------------------------------------------------------------------
 
A Contractholder, at its discretion, may discontinue a Contract as of the first
of a month that is at least 31 days after we receive notice of the
discontinuance. We may discontinue a Contract, in whole or in part, if
 
   -   the Contractholder does not follow the terms of the Contract, or
 
   -   we determine that a modification of the Contract is necessary to
       comply with Federal or state requirements, including the Employee
       Retirement Income Security Act of 1974, as amended, and the
       Contractholder refuses to accept a substantially similar Contract we
       offer that incorporates that modification.
 
Our discontinuance of a Contract will be effective as of a date we specify in
writing that provides the Contractholder with at least 31 days' advance notice
in which to cure any remediable defaults.
 
                                       19
<PAGE>
Discontinuance of a Contract does not relieve the Contractholder of its
obligations under the Contract or the Plan, and amounts accumulated for
Participants will remain under the Contract. Upon discontinuance:
 
   -   the Contractholder may not make any further Contributions, and
 
   -   we may transfer to another insurance company or other financial
       institution all amounts accumulated under the Contract. A transfer may
       be made in any manner to which the Contractholder and we agree in
       writing, and may require the consent of Participants and
       Beneficiaries. A Participant or Beneficiary who does not consent to
       the transfer may choose to leave the accumulated amounts on deposit
       with us, or may withdraw the amount in whole or in part (subject to
       any Federal tax law restrictions on withdrawals).
 
WHEN WE MAY POSTPONE PAYMENTS
- --------------------------------------------------------------------------------
 
We will pay any amounts due from the Separate Account for a withdrawal
(including a Specified Payments Option withdrawal), death benefit or
termination, and will transfer any amount from the Separate Account to the
General Account, within seven days, unless:
 
   -   The New York Stock Exchange is closed for other than usual weekends or
       holidays, or trading on that Exchange is restricted as determined by
       the Commission; or
 
   -   The Commission by order permits postponement for the protection of
       Participants; or
 
   -   An emergency exists, as determined by the Commission, as a result of
       which disposal of securities is not reasonably practicable or it is
       not reasonably practicable to determine the value of the Separate
       Account's net assets.
 
                                       20
<PAGE>
              YOU MAY OBTAIN AN ANNUITY WITH YOUR ACCOUNT BALANCE
- --------------------------------------------------------------------------------
 
AMOUNT OF ANNUITY PAYMENTS
- --------------------------------------------------------------------------------
 
At your Annuity Commencement Date, we will apply your Account Balance to provide
a stream of monthly Annuity Payments (an annuity) from us to you (the
Annuitant). Once Annuity Payments have begun, you may no longer make
Contributions, transfers or withdrawals under the Contract and your Employer may
no longer make Contributions on your behalf. If your Plan permits and subject to
its provisions, you may elect to receive your Account Balance by making partial
or full withdrawals, including withdrawals under our Specified Payments option,
instead of receiving Annuity Payments.
 
We will fix the amount of each Annuity Payment and guarantee their payment,
according to the form of annuity you select. The amount of the Annuity Payments
depends on the annuity form you choose, the applicable annuity purchase rates
and your Account Balance. The life expectancy of the Annuitant(s) is a factor we
use in determining the amount of the monthly Annuity Payments, if the form of
annuity requires us to make payments for your life or for the lives of you and
the joint Annuitant.
 
We guarantee that the purchase rates we use to determine the amount of Annuity
Payments will never be less favorable for you than the guaranteed rates in the
Contract. We also guarantee that we will not increase expense charges under the
Contracts for the Annuity Payments, regardless of our actual expenses.
 
We will issue to your Contractholder for delivery to you an individual
certificate setting forth the amount and terms of payment of your annuity
benefits. We will send Annuity Payments directly to you at your last known
address, as filed with us by you or your Employer.
 
ANNUITY COMMENCEMENT DATE
- --------------------------------------------------------------------------------
 
You must notify us of the Annuity Commencement Date in advance, according to our
procedures. You, unless Federal or state law requires otherwise, may elect an
Annuity Commencement Date that is your:
 
   -   Normal Retirement Date (generally, when you reach age 65); or
 
   -   Early Retirement Date (up to 10 years before your Normal Retirement
       Date); or
 
   -   Later Retirement Date (any time after your Normal Retirement Date).
 
AVAILABLE FORMS OF ANNUITY
- --------------------------------------------------------------------------------
 
If you have an Eligible Spouse on the Annuity Commencement Date, you will
receive Annuity Payments in the form of a Joint and 66 2/3% Survivor Annuity
with your Eligible Spouse as joint Annuitant, unless you, no more than ninety
days before the Annuity Commencement Date, select in writing one of the other
annuity forms listed below and your spouse consents in writing to the form
selected. If you do not have an Eligible Spouse on the Annuity Commencement
Date, you will receive Annuity Payments in the form of a 10 Years Certain and
Continuous Annuity as described below, unless you, before the Annuity
Commencement Date, select in writing a different annuity form.
 
You may select a form of annuity from the list below, and in each case you will
be the Annuitant.
 
TEN YEARS CERTAIN AND CONTINUOUS FORM.  This annuity form provides for monthly
Annuity Payments to you, continuing until the LATER OF the month of your death
and the end of 10 years (the certain period). If you were to die before the end
of the 10 year certain period, your Beneficiary will receive the monthly Annuity
Payments until the end of the 10 year period. If the Beneficiary dies before the
end of the 10 year period, we will pay the commuted value of the remaining
Annuity Payments to the payee named by you.
 
JOINT AND 66 2/3% SURVIVOR LIFE WITH 10 YEAR CERTAIN FORM.  This annuity form
provides a monthly Annuity Payment during your lifetime and 66 2/3% of that
monthly Annuity Payment to the joint Annuitant after your death if the joint
annuitant survives you. If both you and the joint Annuitant die before the end
of
 
                                       21
<PAGE>
the ten year period, payments continue to the Beneficiary in the amount last
paid until the end of the 10 years (the certain period). If a person you have
named as your joint annuitant dies prior to the Annuity Commencement Date, your
election of this annuity form is cancelled automatically.
 
FULL CASH REFUND FORM.  This annuity form provides for monthly Annuity Payments
to you, continuing until the month of your death. If the aggregate amount of the
monthly Annuity Payments that we made to you is less than your Account Balance
at the Annuity Commencement Date, we will pay the difference to the Beneficiary.
The Beneficiary may elect to receive the amount in a lump sum or as an annuity
in the Ten Years Certain and Continuous Form.
 
We will calculate any commuted value on the basis of compound interest at a rate
we determine that is consistent with the interest assumption for the annuity
rates we used to determine the Annuity Payments.
 
OTHER FORMS.  In addition to the forms of annuity listed above, we may in our
discretion offer additional forms of annuity as of your Annuity Commencement
Date.
 
DEATH BENEFIT AFTER ANNUITY COMMENCEMENT DATE
- --------------------------------------------------------------------------------
 
If you (and your joint Annuitant if the form is a joint annuity) were to die on
or after the Annuity Commencement Date, your Beneficiary will receive the death
benefit (if any) provided by the form of annuity under which Annuity Payments
were due. SEE "Available Forms of Annuity" above.
 
LUMP SUM PAYMENT FOR SMALL ANNUITY PAYMENTS
- --------------------------------------------------------------------------------
 
If your Account Balance is less than $5,000 (or a higher amount if then current
law permits us to use a different amount) when you terminate employment with the
Employer, we will pay your Account Balance to you in a single sum payment, and
you may not elect to receive Annuity Payments.
 
                                       22
<PAGE>
                              OUR GENERAL ACCOUNT
- --------------------------------------------------------------------------------
 
SCOPE OF PROSPECTUS
- --------------------------------------------------------------------------------
 
We have not registered the Contracts under the Securities Act of 1933 for
allocations to the General Account, nor is the General Account registered as an
investment company under the 1940 Act. The staff of the Commission has not
reviewed the disclosures in this Prospectus that relate to the General Account.
Disclosures regarding the fixed portion of the Contracts and the General
Account, however, generally are subject to certain provisions of the Federal
securities laws relating to the accuracy and completeness of statements made in
prospectuses. This Prospectus serves as a disclosure document for the variable,
or Separate Account, interests under the Contracts. For more details regarding
the General Account, you should refer to the Contract.
 
GENERAL DESCRIPTION
- --------------------------------------------------------------------------------
 
Amounts you allocate under a Contract to the General Account become part of our
general assets. Our General Account supports our insurance and annuity
obligations. The General Account consists of all of our general assets, other
than those in the Separate Account and other segregated asset accounts.
 
We bear the full investment risk for all amounts that Participants allocate to
the General Account. We have sole discretion to invest the assets of the General
Account, subject to applicable law. Your allocation of Account Balance to the
General Account does not entitle you to share in the investment experience of
the General Account.
 
We guarantee that we will credit interest to Participant Account Balances in the
General Account at an effective annual rate of at least 3%. In our sole
discretion, we may credit a higher rate of interest to Participant Account
Balances in the General Account, although WE ARE NOT OBLIGATED TO CREDIT
INTEREST IN EXCESS OF 3% PER YEAR. We will send you notice when we change the
current rate. We credit interest daily and compound it annually.
 
We reserve the right to credit a higher interest rate than the rate otherwise
set for amounts allocated to the General Account when the Employer uses
electronic media, in compliance with our established rules and requirements, for
the transmission and receipt of certain information regarding Participants,
Contributions and other Contract information.
 
TRANSFERS AND WITHDRAWALS
- --------------------------------------------------------------------------------
 
You may transfer Account Balance to and from the General Account. To the extent
permitted by the Code and your Plan, you may withdraw Account Balance from the
General Account prior to the Annuity Commencement Date. SEE "Your Right to
Transfer Among Investment Alternatives" and "Your Right to Make Withdrawals,
including by Specified Payments" under "Our Payment of Account Balance to You or
a Beneficiary". We have the right to delay transfers and withdrawals from the
General Account for up to six months following the date that we receive the
transaction request.
 
                                       23
<PAGE>
                   HOW TO CONTACT US AND GIVE US INSTRUCTIONS
- --------------------------------------------------------------------------------
 
CONTACTING MUTUAL OF AMERICA
- --------------------------------------------------------------------------------
 
Participants and Contractholders may send in writing all notices and elections
required or permitted under the Contracts, except that you may give certain
instructions by telephone, as described below. Our home office address is:
 
                    Mutual of America Life Insurance Company
                                320 Park Avenue
                            New York, New York 10022
 
You can check the address of your Regional Office by calling 1-800-468-3785 or
by visiting our Web site at www.mutualofamerica.com.
 
TRANSFERS AND ALLOCATION CHANGES BY TELEPHONE
- --------------------------------------------------------------------------------
 
You may make requests by telephone for transfers of Account Balance among
Investment Alternatives or to change the Investment Alternatives to which we
will allocate your future Contributions. You may not make withdrawal requests by
telephone.
 
You must use a Personal Identification Number (PIN) to make telephone requests.
We mail a PIN to you, and your use of the PIN constitutes agreement to use the
PIN in accordance with our rules and requirements. You may call us to change or
cancel your PIN. Our toll-free telephone number for requests is 1-800-468-3785.
 
On any Valuation Day, we will consider requests by telephone that we receive by
4 p.m. Eastern Time (or the close of the New York Stock Exchange, if earlier) as
received that day. We will consider requests that we receive after 4 p.m. (or
the Exchange close) as received the next Valuation Day. We reserve the right to
suspend or terminate at any time the right of Participants to request transfers
or reallocations by telephone.
 
Although our failure to follow reasonable procedures may result in our liability
for any losses due to unauthorized or fraudulent telephone transfers, we will
not be liable for following instructions communicated by telephone that we
reasonably believe to be genuine. We will employ reasonable procedures to
confirm that instructions communicated by telephone are genuine. Those
procedures are to confirm your Social Security number, check the Personal
Identification Number, tape record all telephone transactions and provide
written confirmation of telephone transactions.
 
WHERE YOU SHOULD DIRECT REQUESTS
- --------------------------------------------------------------------------------
 
You should request an allocation change or a transfer of Account Balance among
Investment Alternatives by calling 1-800-468-3785 or sending your written
request to our Processing Center. The address is:
 
                    Mutual of America Life Insurance Company
                    Financial Transaction Processing Center
                          1150 Broken Sound Parkway NW
                              Boca Raton, FL 33487
 
For withdrawals, you must make your request according to our procedures, which
we may change from time to time. Under our current procedures, you should make a
withdrawal request in writing to your Regional Office. You may call our 800
number for the address and phone number of your Regional Office.
 
You should use our forms to submit written requests to us.
 
                                       24
<PAGE>
                             ADMINISTRATIVE MATTERS
- --------------------------------------------------------------------------------
 
YEAR 2000 COMPLIANCE
- --------------------------------------------------------------------------------
 
Many of the services that we provide to Participants and Contractholders depend
on the proper functioning of our computer and computer-based systems, as well as
those of our service providers. Many computer software programs, as initially
developed, could not distinguish the year 2000 from the year 1900. If not
corrected, this inability potentially could have an adverse impact on the
handling of Participant and Contractholder purchase, exchange and redemption
transactions, the crediting of Accumulation Units, accounting and other
recordkeeping services.
 
We have performed a comprehensive review of our computer systems, made the
necessary modifications or replacements and successfully completed system
testing of our in-house software, the largest and most critical project under
our Year 2000 program. For the balance of 1999, we will continue to monitor and
verify Year 2000 compliance. We also have contacted our vendors and service
providers as to the status of their Year 2000 compliance. Vendors and service
providers whose systems are material to our operations have confirmed they are,
or expect to be, Year 2000 compliant. Although we anticipate that our computer
systems and those of our providers will be adapted in time for the year 2000, it
is possible Year 2000 problems still may occur. We have developed written
contingency plans to ensure our business continuity through the year 2000.
 
CONFIRMATION STATEMENTS TO PARTICIPANTS
- --------------------------------------------------------------------------------
 
We will send you a confirmation statement each time you change your allocation
instructions, we receive a new Contribution from or for you, or you transfer any
portion of your Account Balance among the Investment Alternatives. A
confirmation statement for a new Contribution or transfer of Account Balance may
be part of your next quarterly (or monthly, if applicable) account statement.
You must notify us of any error in a confirmation statement within 30 days after
the date we processed the change or transaction, or within 30 days after the end
of the period covered by the quarterly (or monthly) statement that serves as the
confirmation statement, or you will lose the right to have us correct the error.
 
DESIGNATION OF BENEFICIARY
- --------------------------------------------------------------------------------
 
You may designate a Beneficiary to receive any payments due to your Beneficiary,
subject to any limits under a Plan or the Code. You may change the Beneficiary
while you are living, either before or after the Annuity Commencement Date, by
providing us (or your Employer when the Employer has agreed to hold such
information) with written notice of the change. The designation or change in
designation will take effect as of the date we (or your Employer, if applicable)
receive notice, whether or not you are living at the time of such receipt. We
will not be liable, however, for any payment or settlement we make before we
receive the notice of Beneficiary or change of Beneficiary.
 
If you are married, the Beneficiary will be your Eligible Spouse unless we have
received consent from the Eligible Spouse to permit another Beneficiary. The
consent must:
 
   -   be in writing,
 
   -   be signed by the Eligible Spouse and witnessed either by a notary
       public or a Plan representative,
 
   -   agree to your election to waive any qualified preretirement survivor
       annuity and qualified joint and survivor annuity forms of benefit that
       otherwise would be applicable, and
 
   -   agree to the designation of a Beneficiary other than your Eligible
       Spouse.
 
You may not make subsequent Beneficiary designations or selections of forms of
annuity benefit unless your Eligible Spouse provides written consent in the same
manner.
 
If no Beneficiary designated by you is living at the time of your death during
the Accumulation Period, or upon your death (and the death of the joint
Annuitant, if any) during the Annuity Period, we will pay a
 
                                       25
<PAGE>
single sum payment or the commuted value of any remaining periodic payments to a
Beneficiary or Beneficiaries determined under the Contract. The Contract lists
classes of Beneficiaries in an order of preference. We will pay the surviving
family member(s) in the first class of Beneficiaries we find, in this order:
 
   -   your spouse; your children; your parents; and your brothers and
       sisters.
 
If we do not find family members in these classes, we will pay the executors or
administrators of your estate.
 
CERTAIN ADMINISTRATIVE PROVISIONS
- --------------------------------------------------------------------------------
 
ASSIGNMENT OF CONTRACT.  Contractholders and Participants may not assign or
transfer a Contract or any rights under a Contract, except as otherwise required
by law.
 
MODIFICATION OF CONTRACTS.  Our rights and obligations under a Contract cannot
be changed or waived, unless one of our duly authorized officers signs a written
agreement of the change or waiver.
 
We may change a Contract at any time by amendment or replacement, without the
consent of any Participant or the consent of any other person who is or may
become entitled to benefits under the Contract. Any change we make may not
affect the amount or the terms of Annuity Payments that began before such
change.
 
EVIDENCE OF SURVIVAL.  When payment of a benefit is contingent upon the survival
of any person, we may require that evidence of that person's survival be
furnished to us, either by personal endorsement of the check drawn for payment,
or by other means satisfactory to us.
 
MISSTATEMENT OF INFORMATION.  If we pay a benefit under a Contract based on
information that you or a Beneficiary misstated to us, we will recalculate the
benefit when we learn of the misstatement. We will adjust the amount of the
benefit payments, or the amount applied to provide the benefit, or both, to the
proper amount we determine based on the corrected information.
 
If we underpaid benefits due to any misstatement, we will pay the amount of the
underpayment in full with the next payment due under the Contract. If we
overpaid any benefits due to a misstatement, we will deduct the overpayment to
the extent possible from payments as they become due under the Contract. We will
include interest on the amount of any underpayments or charge interest on
overpayments, at the effective rate then required under State insurance law
provisions.
 
INFORMATION AND DETERMINATION.  Contractholders and Participants, as
appropriate, must furnish us with the facts and information that we may require
for the operation of the Contract including, upon request, the original or
photocopy of any pertinent records held by the Contractholder or Participant. A
Contractholder should report to us any determination that the Contractholder
makes pursuant to the terms of the Plan. We may rely on reports and other
information furnished by Contractholders or Participants and are not obligated
to inquire as to the accuracy or completeness of such reports and information.
 
NON-ALIENATION OF BENEFITS.  To the extent permitted by law (a) no amount
payable with respect to you may be subject to alienation, attachment,
garnishment, levy (other than a Federal tax levy or a Qualified Domestic
Relations Order), execution, or other legal or equitable process, and (b) no
such amount will in any way be subject to any legal process that would subject
it to the payment of any claim against you or a Beneficiary.
 
PARTICIPATION IN DIVISIBLE SURPLUS
- --------------------------------------------------------------------------------
 
We are a mutual life insurance company and consequently have no stockholders.
Participants share in our earnings with respect to amounts they allocate to our
General Account. We can give no assurance as to the amount of divisible surplus,
if any, that will be available for distribution under the Contracts in the
future. The determination of such surplus is within the sole discretion of our
Board of Directors.
 
                                       26
<PAGE>
                    FEDERAL TAX INFORMATION FOR PARTICIPANTS
- --------------------------------------------------------------------------------
 
For Federal income tax purposes, the Separate Account is not separate from us,
and its operations are considered part of our operations. Under existing Federal
income tax law, we do not pay taxes on the net investment income and realized
capital gains earned by the Separate Account. We reserve the right, however, to
make a deduction for taxes if in the future we must pay tax on the Separate
Account's operations.
 
OBTAINING TAX ADVICE
- --------------------------------------------------------------------------------
 
THE DESCRIPTION BELOW OF THE CURRENT FEDERAL TAX STATUS AND CONSEQUENCES FOR
PARTICIPANTS UNDER THE CONTRACTS IS NOT EXHAUSTIVE AND IS FOR INFORMATION
PURPOSES ONLY. TAX PROVISIONS AND REGULATIONS MAY CHANGE AT ANY TIME. Tax
results may vary depending upon your individual situation, and special rules may
apply to you in certain cases. You also may be subject to State and local taxes.
For these reasons, you or a Beneficiary should consult a qualified tax adviser
for complete tax information.
 
PAYMENTS UNDER ANNUITY CONTRACTS GENERALLY
- --------------------------------------------------------------------------------
 
Section 72 of the Code describes the income taxation of payments under annuity
contracts, either during the accumulation period or after the annuity
commencement date. We intend that the provisions of Section 72 will apply to
payments we make under the Contracts.
 
The general rule is that you must receive a payment under a Plan in order to be
subject to income taxation. You do not include in your gross income the interest
and investment earnings we credit to your Account Balance until you withdraw or
otherwise receive such amounts.
 
When you receive a Plan distribution or Annuity Payments, all or part of the
payment will be taxable to you as ordinary income. An important factor in
determining the taxable portion is whether you have an INVESTMENT IN THE
CONTRACT, which generally is the amount of after-tax Contributions that you have
made and not previously withdrawn. A Participant in a 403(b) Thrift Plan will
not have any investment in the contract. A Participant in a 401(a) Thrift Plan
may have an investment in the contract, depending on whether the Plan provides
for after-tax Contributions.
 
The following are general concepts, applicable for the discussion below about
specific types of distributions.
 
   -   If you do not have an investment in the contract, you must include in
       gross income the entire amount received during the tax year.
 
   -   If you do have an investment in the contract, you may be able to
       exclude from gross income a portion of the Annuity Payments or other
       distribution received.
 
   -   The amount you may exclude from gross income each year represents a
       partial return of your Contributions, if any, that you made with
       after-tax dollars (I.E., Contributions that you did not deduct or
       exclude from gross income for the tax year when the Contributions were
       made).
 
   -   The EXCLUSION RATIO is a method of determining the percentage of
       Annuity Payments that you may exclude from gross income for a tax
       year. The percentage you may exclude is calculated by dividing your
       investment in the contract by your expected return from the Contract.
 
   -   The EXPECTED RETURN is the present (or discounted) value of the
       Annuity Payments or other periodic payments we expect to make to you.
 
WITHDRAWALS.  When you withdraw a portion of your Account Balance, the amount
withdrawn will be considered to come pro rata from amounts the Employer
contributed on your behalf and your Contributions. If you receive amounts (that
are not Annuity Payments) under a Contract when you have an investment in the
contract, you generally may exclude a portion of the payments from gross income.
You may exclude from gross income an amount determined by dividing your
investment in the contract by your vested Account Balance as of the date of the
distribution. The Internal Revenue Service may indicate another date for valuing
Account Balances for this purpose.
 
                                       27
<PAGE>
LUMP SUM PAYMENTS.  If you receive a single lump sum payment of the Account
Balance, you must include in gross income, for the tax year in which you receive
the payment, the difference between the amount of the payment and your
investment in the contract, if any. Special income tax treatment may be
available if a payment constitutes a "lump sum distribution" made from a
retirement plan meeting the requirements of Section 401(a) of the Code.
 
ANNUITY PAYMENTS.  If you begin to receive Annuity Payments, or another form of
periodic payments such as an installment method for a fixed period or a fixed
amount, you may apply the exclusion ratio method to determine the amount to
exclude from gross income for the tax year of the distribution.
 
The exclusion ratio method continues to apply until you recover the investment
in the contract. After that time, you will have to include the full amount of
each Annuity Payment in gross income for each taxable year. If your death occurs
before you have recovered the investment in the contract, the unrecovered amount
may either be deducted on the final income tax return for your last taxable year
or by the Beneficiary.
 
PENALTY TAXES FOR WITHDRAWALS
- --------------------------------------------------------------------------------
 
In addition to ordinary income taxation, Section 72 of the Code imposes a
penalty tax on your premature withdrawals, which are withdrawals before you have
reached age 59 1/2. This penalty tax is equal to 10% of the amount of the
premature withdrawal that you include in gross income.
 
The taxable amount of a withdrawal before you reach age 59 1/2 is not subject to
a penalty tax if:
 
1.  You have died or become disabled.
 
2.  The withdrawals are Annuity Payments made over your life (or life
   expectancy) or the joint lives (or joint life expectancies) of you and the
   Beneficiary.
 
3.  The withdrawals are to pay your medical expenses or those of your spouse or
   dependents, if the medical expenses would be deductible by you for federal
   income tax purposes. (Generally, a taxpayer may deduct medical expenses if
   they are not covered by health insurance or otherwise reimbursed and they
   exceed 7.5% of the taxpayer's adjusted gross income.) OR
 
4.  You ended your employment with the Employer after first reaching age 55.
 
EXCLUSION OF CONTRIBUTIONS FROM GROSS INCOME
- --------------------------------------------------------------------------------
 
403b THRIFT PLAN CONTRACTS.  We offer the Contract for TDA Thrift Plans designed
to meet the requirements of Section 403(b) of the Code. Under Section 403(b),
Participants who are employees of public schools and organizations that are
exempt from tax under Section 501(c)(3) of the Code may exclude from their gross
income the Contributions applied to purchase annuity contracts on their behalf.
This exclusion is subject to the following limits:
 
   -   The aggregate Contributions per year for each employee cannot exceed
       the "exclusion allowance" set forth in Section 403(b)(2) of the Code
       or, if applicable, the contribution limitation in Section 415(c) of
       the Code.
 
   -   If you make Contributions under a salary reduction agreement, an
       additional limitation contained in Section 402(g) of the Code is
       applicable.
 
Contributions that you may exclude usually are limited to the SMALLEST amount
under these provisions. In general, the limitations are as follows:
 
   -   The total Contribution for a year cannot exceed the excess of 20% of
       the employee's includable compensation (before salary reduction
       contributions) for that year, multiplied by the employee's years of
       service, minus any amounts contributed by the Employer and excludable
       from the employee's gross income for any prior taxable years;
 
                                       28
<PAGE>
   -   The Contributions to the Plan cannot exceed the LESSER of $30,000 or
       25% of your includable compensation (before salary reduction
       contributions), with compensation limited to $160,000 for 1999 (to be
       indexed for inflation in subsequent years);
 
   -   Your contributions through salary reduction may not exceed $10,000 in
       1999 (indexed for inflation in subsequent years). A special
       "catch-up," available to employees with 15 or more years of service
       with the same Employer who have not made maximum contributions in
       prior years, may increase that amount by up to $3,000 per year, to a
       maximum life-time "catch-up" of $15,000.
 
Contributions to other employer retirement plans by or for you may reduce the
above limits for you. Under certain circumstances, the tax law may allow you to
make special elections that would increase the amount of Contributions you may
exclude.
 
401(a) THRIFT PLAN CONTRACTS.  You may not exclude or deduct Contributions from
your gross income, unless your Plan is subject to Code Section 401(k). For
401(k) plans, you may exclude from gross income your salary reduction
Contributions of up to $10,000 in 1999 (indexed for inflation in subsequent
years). For SIMPLE 401(k) Plans, that Participant Contribution limit is reduced
to $6,000 for 1999 (indexed for inflation in later years).
 
The total amount of Contributions made by you and by the Employer on your behalf
for any year is limited to the lesser of $30,000 or 25% of your includable
compensation (but before any salary reduction contributions that are excludable
from gross income), with compensation limited to $160,000 for 1999 (indexed for
inflation for later years).
 
Contributions by or for you to other employer retirement plans may reduce the
above limits for you.
 
MINIMUM REQUIRED DISTRIBUTIONS
- --------------------------------------------------------------------------------
 
The Code contains a series of rules that require you (or your Beneficiary) to
take minimum distributions beginning at a certain time (called the REQUIRED
BEGINNING DATE) under any of the Plans for which we issue Contracts. For Plans
subject to Code Section 403(b), you may take the required amount from a Contract
we have issued, or from other contracts of the same type that you own.
 
You usually must begin taking distributions of Account Balance by April 1 of the
year following the year you reach age 70 1/2, unless you are still employed. A
Plan, however, may require you if you are still employed to begin receiving
minimum distributions at age 70 1/2. Also, if you are a TDA Plan Participant,
you generally are not required to begin taking distributions of any pre-1987
Account Balance until the year after you reach age 75.
 
You may elect to calculate the required minimum distribution amount by one of
several methods, and you should consult a tax adviser in making the election. We
will provide explanatory information to Participants before their Required
Beginning Dates. If you do not satisfy the minimum distribution requirements,
you may owe a penalty tax equal to 50% of the difference between the required
minimum and the actual amount you withdrew. In addition, the Plan may make the
minimum payment to you without your consent.
 
Federal tax law provisions concerning distributions upon the death of a
Participant may reduce the period over which a Beneficiary may take or defer
receipt of the death benefit. SEE "Our Payment of Account Balance to You or a
Beneficiary--Death Benefit Prior to Annuity Commencement Date".
 
ESTATE TAXES; TAX LIABILITY OF BENEFICIARY FOR DEATH BENEFIT
- --------------------------------------------------------------------------------
 
The death benefit payable to your Beneficiary is included in your estate for
Federal estate tax purposes, except in limited circumstances. SEE "Obtaining Tax
Advice."
 
A Beneficiary generally will not receive a "stepped-up basis" for the increase
in value under your Contract over the amount of your Contributions. The gain
under a Contract is called "income in respect of a decedent" (IRD), and the
Beneficiary may owe income tax at ordinary income rates on the IRD when the
Beneficiary receives the death benefit. See "Obtaining Tax Advice." If your
estate pays any estate tax on the death benefit, the Beneficiary may be able to
credit the estate tax paid against the
 
                                       29
<PAGE>
income tax the Beneficiary owes. A Beneficiary should consult a tax adviser for
a complete explanation of the rules that will apply to the Beneficiary's
particular situation.
 
WITHHOLDING ON ANNUITY PAYMENTS AND OTHER DISTRIBUTIONS
- --------------------------------------------------------------------------------
 
We are required to withhold Federal income tax on Annuity Payments and other
distributions, such as lump sum distributions or withdrawals. In addition,
certain states require us to withhold if Federal withholding is applicable. In
some instances, you may elect to have us not withhold Federal income tax.
 
Most withdrawals are subject to automatic 20% federal income tax withholding
unless you elect to have us pay the withdrawal directly, as a tax-free rollover,
to another eligible plan or an IRA. The same rules generally apply to payments
of death benefits to a surviving spouse Beneficiary, or to payments to a spouse
or former spouse in connection with a divorce or separation decree or court
order, except that a surviving spouse Beneficiary may have a direct rollover
made to an IRA.
 
The automatic 20% withholding does not apply to any distribution that is:
 
   -   one of a series of substantially equal periodic payments (not less
       frequently than annually) made for
 
       DIAMONDyour life (or life expectancy) or the joint lives (or joint
              life expectancies) of you and your designated Beneficiary,
              or
 
       DIAMONDa specified period of 10 years or more, or
 
   -   a minimum distribution required under Section 401(a)(9) of the Code.
 
In general, tax withholding at different rates, usually 10%, does apply to such
payments, but payees can elect to waive withholding. Death benefit payments to
non-spouse Beneficiaries generally cannot be rolled over and are subject to tax
withholding at different rates, but such payees generally also can elect to
waive withholding. Certain small payments may be exempt from direct rollover and
tax withholding rules.
 
When you (or a Beneficiary) request withdrawals or Annuity Payments, we will
give detailed information and advise you (or the Beneficiary) of possible
elections to be made. Participants and Beneficiaries should carefully review
information they receive from us.
 
                                       30
<PAGE>
            YOUR VOTING RIGHTS FOR MEETINGS OF THE UNDERLYING FUNDS
- --------------------------------------------------------------------------------
 
We will vote the shares of the Underlying Funds owned by the Separate Account at
regular and special meetings of the shareholders of the Underlying Funds. We
will cast our votes according to instructions we receive from Participants. The
number of Underlying Fund shares that we may vote at a meeting of shareholders
will be determined as of a record date set by the Board of Directors or Trustees
of the Underlying Fund.
 
We will vote 100% of the shares that a Separate Account Fund owns. If you do not
send us voting instructions, we will vote the shares attributable to your
Account Balance in the same proportion as we vote shares for which we have
received voting instructions from Participants. We will determine the number of
Accumulation Units attributable to each Participant for purposes of giving
voting instructions as of the same record date used by the Underlying Fund.
 
Each Participant who has the right to give us voting instructions for a
shareholders' meeting of an Underlying Fund will receive information about the
matters to be voted on, including the Underlying Fund's proxy statement and a
voting instructions form to return to us.
 
We may elect to vote the shares of the Underlying Funds held by our Separate
Account in our own discretion if the Investment Company Act of 1940 is amended,
or if the present interpretation of the Act changes with respect to our voting
of these shares.
             PERFORMANCE INFORMATION FOR THE SEPARATE ACCOUNT FUNDS
- --------------------------------------------------------------------------------
 
MONEY MARKET FUND
- --------------------------------------------------------------------------------
 
From time to time, we may include quotations of the YIELD and EFFECTIVE YIELD of
the Separate Account's Money Market Fund in advertisements, sales literature or
reports to Participants. These yield figures show historical performance of the
Fund assuming a hypothetical investment for the period indicated in the yield
quotation. Yield figures do not indicate future performance.
 
The yield of the Money Market Fund refers to the net investment income generated
by the Fund over a specified seven-day period (with the ending date stated). We
then annualize this income. That is, we assume that the amount of income the
Fund generates during that week is generated during each week in a 52-week
period and we show the income as a percentage.
 
The effective yield is calculated similarly to yield, except that when we
annualize income, we assume that the income earned by an investment in the Fund
is reinvested. The effective yield will be slightly higher than the yield
because of the compounding effect of this assumed reinvestment.
 
Yield and effective yield for the Money Market Fund will vary based on its
expenses and the performance of its the Investment Company Money Market Fund,
which reflects (among other things) changes in market conditions and the level
of its expenses.
 
TOTAL RETURN OF FUNDS
- --------------------------------------------------------------------------------
 
From time to time, we include quotations of a Separate Account Fund's TOTAL
RETURN in advertisements, sales literature or reports to Participants. Total
return figures for a Fund show historical performance of a Fund assuming a
hypothetical investment and that amounts under a Contract were allocated to the
Separate Account Fund when it commenced operations. Total return figures do not
indicate future performance.
 
Total return quotations are expressed in terms of average annual compounded
rates of return for all periods quoted and assume that all dividends and capital
gains distributions were reinvested. Total return for a Separate Account Fund
will vary based on its expenses and the performance of its Underlying Fund,
which reflects (among other things) changes in market conditions and the level
of the Underlying Fund's expenses.
 
                                       31
<PAGE>
                     FUNDING AND OTHER CHANGES WE MAY MAKE
- --------------------------------------------------------------------------------
 
We reserve the right to make certain changes to the Separate Account Funds and
to the Separate Account's operations. In making changes, we will comply with
applicable law and will obtain the approval of Participants and/or the
Contractholders, if required. We may:
 
   -   create new investment funds of the Separate Account at any time;
 
   -   to the extent permitted by state and federal law, modify, combine or
       remove investment funds in the Separate Account;
 
   -   transfer assets we have determined to be associated with the class of
       contracts to which the Contracts belong from one investment fund of
       the Separate Account to another investment fund;
 
   -   create additional separate accounts or combine any two or more
       accounts including the Separate Account;
 
   -   transfer assets we have determined to be associated with the class of
       contracts to which the Contracts belong from the Separate Account to
       another separate account of ours by withdrawing the same percentage of
       each investment in the Separate Account, with appropriate adjustments
       to avoid odd lots and fractions;
 
   -   operate the Separate Account as a diversified, open-end management
       investment company under the 1940 Act, or in any other form permitted
       by law, and designate an investment advisor for its management, which
       may be us, an affiliate of ours or another person;
 
   -   deregister the Separate Account under the 1940 Act; and
 
   -   operate the Separate Account under the general supervision of a
       committee, any or all the members of which may be interested persons
       (as defined in the 1940 Act) of ours or our affiliates, or discharge
       the committee for the Separate Account.
 
                                       32
<PAGE>
                     DEFINITIONS WE USE IN THIS PROSPECTUS
- --------------------------------------------------------------------------------
 
ACCOUNT BALANCE--The value of a Participant's Accumulation Units in the Separate
Account Funds plus the value of amounts held in the General Account for the
Participant, during the Accumulation Period. As used in this Prospectus, the
term "Account Balance" may mean all or any part of your total Account Balance.
 
ACCUMULATION PERIOD--For a Participant, the period under a Contract when
Contributions are made or held for the Participant. The Accumulation Period ends
at the Annuity Commencement Date, or the date the Participant withdraws the
Account Balance in full before the Annuity Commencement Date.
 
ACCUMULATION UNIT--A measure we use to calculate the value of a Participant's
interest in each of the Funds of the Separate Account. Each Fund has its own
Accumulation Unit value.
 
ANNUITANT--A person who is receiving Annuity Payments or who will receive
Annuity Payments after the Annuity Commencement Date. You must be the Annuitant;
and a Beneficiary who has elected to receive a death benefit in the form of an
annuity may be the Annuitant or name another person as the Annuitant. You or a
Beneficiary also may name a joint Annuitant, except that some Plans require the
consent of your Eligible Spouse if the Eligible Spouse is not the joint
Annuitant. We use the life expectancy of the Annuitant(s) as a factor in
determining the amount of monthly Annuity Payments for annuities with a life
contingency.
 
ANNUITY COMMENCEMENT DATE--The date Annuity Payments become payable under a
Contract or become payable as the death benefit for a Beneficiary. You, or a
Beneficiary entitled to a death benefit, selects the Annuity Commencement Date,
or the Annuity Commencement Date may be imposed under Federal tax law provisions
in certain circumstances. On the Annuity Commencement Date, all of your Account
Balance is used to provide Annuity Payments.
 
ANNUITY PAYMENTS--A series of equal monthly payments from us to an Annuitant.
The amount of the Annuity Payment will depend on your Account Balance on the
Annuity Commencement Date and the form of annuity selected. The Annuity Payments
may be for the Annuitant's life, for a minimum period of time, for the joint
lifetime of the Annuitant and the joint Annuitant, or for such other specified
period as we may permit.
 
BENEFICIARY(IES)--The person(s) named by a Participant to receive (1) during the
Accumulation Period, the death benefit under the Contract if the Participant
dies, or (2) after the Annuity Commencement Date, any remaining Annuity Payments
(or their commuted value) if the Annuitant dies and the joint Annuitant, if any,
dies.
 
CODE--The Internal Revenue Code of 1986, as amended. Depending on the context,
the term Code includes the regulations adopted by the Internal Revenue Service
for the Code section being discussed.
 
CONTRACT--The group variable accumulation annuity contract described in this
Prospectus.
 
CONTRACTHOLDER--An entity to which we have issued a Contract. A Contractholder
may be an employer, an association representing employers, or the trustee(s) of
a Plan maintained by one or more employers.
 
CONTRIBUTIONS--Amounts contributed from time to time under a Contract.
 
ELIGIBLE SPOUSE--The person to whom a Participant or Annuitant is legally
married.
 
EMPLOYER--An employer that has purchased a Contract to fund a Plan, or an
employer that makes Contributions for its employees under a Contract purchased
by a trust or other entity for the benefit of its employees.
 
FIDELITY PORTFOLIOS--The Equity-Income Portfolio of the Variable Insurance
Products Fund (FIDELITY VIP) and the Contrafund and Asset Manager Portfolios of
the Variable Insurance Products Fund II (FIDELITY VIP II).
 
                                       33
<PAGE>
FUND OF THE SEPARATE ACCOUNT (OR FUND)--One of the subaccounts of the Separate
Account. Each Fund is named for the Underlying Fund in which it invests.
 
GENERAL ACCOUNT--Assets we own that are not in a separate account, but rather
are held as part of our general assets. We sometimes refer to the General
Account as the INTEREST ACCUMULATION ACCOUNT, because amounts you allocate to
the General Account earn interest at a fixed rate that we change from time to
time.
 
INVESTMENT ALTERNATIVES--The General Account and the Funds of the Separate
Account. You may allocate your Contributions and transfer your Account Balance
among the Investment Alternatives, subject to any limitations under your Plan.
 
INVESTMENT COMPANY--Mutual of America Investment Corporation.
 
NON-VESTED ACCOUNT BALANCE--The portion of your Account Balance attributable to
your Employer's Contributions on your behalf, and earnings on those
Contributions, that under your Plan would belong to your Employer if you leave
employment before a certain period of time after the Contributions were made.
 
PARTICIPANT--An employee or former employee who participates in a Plan and for
whom we have received Contributions.
 
PLAN--An Employer-sponsored retirement savings plan (or THRIFT plan) for which
we issue a Contract, which usually permits employees to make voluntary
Contributions. A Plan must satisfy the requirements of:
 
(1) Code Section 403(b), in which case it is called a 403(b) THRIFT plan; or
 
(2) Code Section 401(a), including a plan that meets the requirements of Section
   401(k), in which case it is called a 401(a) THRIFT or a 401(k) THRIFT plan.
 
(3) Code Section 401(a) or 403(b) for certain defined contribution pension or
   profit-sharing plans that do not permit employee contributions.
 
SCUDDER PORTFOLIOS--The following three portfolios of the Scudder Variable Life
Investment Fund: the Capital Growth Portfolio, the Bond Portfolio and the
International Portfolio.
 
SEPARATE ACCOUNT--Mutual of America Separate Account No. 2, a separate account
established by us to receive and invest deposits made under variable
accumulation annuity contracts and other variable contracts. The assets of the
Separate Account are set aside and kept separate from our other assets.
 
UNDERLYING FUNDS--The funds or portfolios that are invested in by the Separate
Account Funds.
 
VALUATION DAY--Each day that the New York Stock Exchange is open for business
until the close of the New York Stock Exchange that day.
 
VALUATION PERIOD--A period beginning on the close of business of a Valuation Day
and ending on the close of the next Valuation Day. We, us, our, Mutual of
America--Refer to Mutual of America Life Insurance Company.
 
WE, US, OUR, MUTUAL OF AMERICA--Refer to Mutual of America Life Insurance
Company.
 
YOU, YOUR--Refer to a Participant.
 
                                       34
<PAGE>
                    OUR STATEMENT OF ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
The Statement of Additional Information contains more information about the
Contracts and our operations.
 
TABLE OF CONTENTS OF STATEMENT OF ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                         <C>
Distribution of the Contracts               Legal Proceedings
Calculation of Accumulation Unit Values     Legal Matters
Yield and Performance Information           Experts
Safekeeping of Separate Account Assets      Additional Information
State Regulation                            Financial Statements
Periodic Reports
</TABLE>
 
HOW TO OBTAIN A STATEMENT OF ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
You may receive a copy of the Statement of Additional Information at no charge
by calling (212) 224-1600 or by completing the Form below and mailing it to
Mutual of America Life Insurance Company, 320 Park Avenue, New York, New York
10022.
 
The Securities and Exchange Commission has an Internet web site at
http://www.sec.gov. You may obtain our Registration Statement for the Contracts,
including the SAI, and the Separate Account's semi-annual and annual financial
statement reports through the Commission's Internet site. You also may obtain
copies of these documents, upon your payment of a duplicating fee, by writing to
the Commission's Public Reference Section, Washington, DC 20549-6009.
 
(PLEASE CUT HERE)
- --------------------------------------------------------------------------------
 
To: Mutual of America Life Insurance Company
 
Please send me a copy of the Statement of Additional Information dated May 1,
1999 for the Thrift Plan Contract offered by Mutual of America. My name and
address are as follows:
 
- --------------------------------------------------------------------------------
               Name
 
- --------------------------------------------------------------------------------
               Street Address
 
- --------------------------------------------------------------------------------
               City              State                  Zip
 
                                       35
<PAGE>
                 (This page has been left blank intentionally.)
 
                                       36
<PAGE>
                                   APPENDIX A
             UNIT VALUE INFORMATION FOR THE SEPARATE ACCOUNT FUNDS
- --------------------------------------------------------------------------------
 
The tables below show changes in Accumulation Unit values and in the number of
units outstanding for each Separate Account Fund for the period from the
commencement of operations of that Fund to December 31, 1998. (The Mid-Cap
Equity Index Fund is not included because it began operations on May 1, 1999.)
Arthur Andersen LLP, the Funds' independent auditor, has audited the information
below for each of the years in the seven year period ended December 31, 1998.
The Funds' previous auditor audited information for each of the three years in
the period ended December 31, 1991. The Investment Company's financial
statements for the year ended December 31, 1998, along with Arthur Andersen
LLP's report thereon, are available to you by calling 1-800-468-3785.
 
We calculate Accumulation Unit values from the net asset values of the
Underlying Funds. The All America Fund (previously called the Stock Fund) of the
Investment Company changed its name and its investment objectives and policies
and added subadvisers on May 1, 1994. Prior to January 1, 1998, the Calvert
Social Balanced Portfolio was known as the Calvert Responsibly Invested Balanced
Portfolio, and prior to May 1, 1995, that Portfolio was known as the Calvert
Socially Responsible Series and had a different subadviser. Before May 1, 1997,
the American Century VP Capital Appreciation Fund was called the TCI Growth
Fund.
<TABLE>
<CAPTION>
                                                                  INVESTMENT COMPANY ALL AMERICA FUND
                                   -------------------------------------------------------------------------------------------------
                                     1998       1997       1996       1995       1994       1993       1992       1991       1990
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year....  $    6.76  $    5.39  $    4.52  $    3.35  $    3.36  $    3.03  $    2.97  $    2.41  $    2.47
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Unit value, end of year..........  $    8.09  $    6.76  $    5.39  $    4.52  $    3.35  $    3.36  $    3.03  $    2.97  $    2.41
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Thousands of accumulation units
 outstanding, end of year........     49,275     51,312     49,798     43,620     38,669     36,510     32,352     26,173     20,973
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
                                     1989
                                   ---------
<S>                                <C>
Unit value, beginning of year....  $    1.98
                                   ---------
                                   ---------
Unit value, end of year..........  $    2.47
                                   ---------
                                   ---------
Thousands of accumulation units
 outstanding, end of year........     20,157
                                   ---------
                                   ---------
</TABLE>
<TABLE>
<CAPTION>
                                                                   INVESTMENT COMPANY COMPOSITE FUND
                                   -------------------------------------------------------------------------------------------------
                                     1998       1997       1996       1995       1994       1993       1992       1991       1990
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year....  $    4.36  $    3.75  $    3.39  $    2.82  $    2.95  $    2.55  $    2.43  $    2.08  $    2.04
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Unit value, end of year..........  $    4.93  $    4.36  $    3.75  $    3.39  $    2.82  $    2.95  $    2.55  $    2.43  $    2.08
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Thousands of accumulation units
 outstanding, end of year........     59,833     61,359     66,715     70,558     73,239     71,215     50,944     43,115     37,461
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
                                     1989
                                   ---------
<S>                                <C>
Unit value, beginning of year....  $    1.73
                                   ---------
                                   ---------
Unit value, end of year..........  $    2.04
                                   ---------
                                   ---------
Thousands of accumulation units
 outstanding, end of year........     32,716
                                   ---------
                                   ---------
</TABLE>
<TABLE>
<CAPTION>
                                                                     INVESTMENT COMPANY BOND FUND
                                   -------------------------------------------------------------------------------------------------
                                     1998       1997       1996       1995       1994       1993       1992       1991       1990
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year....  $    3.00  $    2.75  $    2.69  $    2.28  $    2.39  $    2.13  $    1.99  $    1.73  $    1.67
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Unit value, end of year..........  $    3.17  $    3.00  $    2.75  $    2.69  $    2.28  $    2.39  $    2.13  $    1.99  $    1.73
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Thousands of accumulation units
 outstanding, end of year........     17,746     12,671     12,548     12,083     10,601     12,244      9,203      6,152      5,235
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
                                     1989
                                   ---------
<S>                                <C>
Unit value, beginning of year....  $    1.49
                                   ---------
                                   ---------
Unit value, end of year..........  $    1.67
                                   ---------
                                   ---------
Thousands of accumulation units
 outstanding, end of year........      4,164
                                   ---------
                                   ---------
</TABLE>
<TABLE>
<CAPTION>
                                                                 INVESTMENT COMPANY MONEY MARKET FUND
                                   -------------------------------------------------------------------------------------------------
                                     1998       1997       1996       1995       1994       1993       1992       1991       1990
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year....  $    1.95  $    1.87  $    1.80  $    1.72  $    1.68  $    1.65  $    1.62  $    1.54  $    1.44
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Unit value, end of year..........  $    2.03  $    1.95  $    1.87  $    1.80  $    1.72  $    1.68  $    1.65  $    1.62  $    1.54
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Thousands of accumulation units
 outstanding, end of year........     19,121     16,831     17,511     17,502     17,653     15,815     16,545     15,656     13,972
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
                                     1989
                                   ---------
<S>                                <C>
Unit value, beginning of year....  $    1.33
                                   ---------
                                   ---------
Unit value, end of year..........  $    1.44
                                   ---------
                                   ---------
Thousands of accumulation units
 outstanding, end of year........      8,570
                                   ---------
                                   ---------
</TABLE>
<TABLE>
<CAPTION>
                                                           INVESTMENT COMPANY                           INVESTMENT COMPANY
                                                           EQUITY INDEX FUND                            MID-TERM BOND FUND
                                   ------------------------------------------------------------------  --------------------
                                     1998       1997       1996       1995       1994        1993*       1998       1997
                                   ---------  ---------  ---------  ---------  ---------  -----------  ---------  ---------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>          <C>        <C>
Unit value, beginning of
 period..........................  $    2.26  $    1.72  $    1.42  $    1.05  $    1.05   $    1.00   $    1.26  $    1.19
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
Unit value, end of period........  $    2.86  $    2.26  $    1.72  $    1.42  $    1.05   $    1.05   $    1.32  $    1.26
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
Thousands of accumulation units
 outstanding, end of period......     94,019     68,462     35,660     17,109      4,644       2,135       7,325      4,478
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
 
<CAPTION>
 
                                     1996       1995       1994        1993*
                                   ---------  ---------  ---------  -----------
<S>                                <C>        <C>        <C>        <C>
Unit value, beginning of
 period..........................  $    1.16  $    1.01  $    1.06   $    1.00
                                   ---------  ---------  ---------       -----
                                   ---------  ---------  ---------       -----
Unit value, end of period........  $    1.19  $    1.16  $    1.01   $    1.06
                                   ---------  ---------  ---------       -----
                                   ---------  ---------  ---------       -----
Thousands of accumulation units
 outstanding, end of period......      3,828      2,848      1,444       1,411
                                   ---------  ---------  ---------       -----
                                   ---------  ---------  ---------       -----
</TABLE>
 
                                       37
<PAGE>
<TABLE>
<CAPTION>
                                                                                                        INVESTMENT COMPANY
                                                           INVESTMENT COMPANY                           AGGRESSIVE EQUITY
                                                          SHORT-TERM BOND FUND                                 FUND
                                   ------------------------------------------------------------------  --------------------
                                     1998       1997       1996       1995       1994        1993*       1998       1997
                                   ---------  ---------  ---------  ---------  ---------  -----------  ---------  ---------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>          <C>        <C>
Unit value, beginning of
 period..........................  $    1.19  $    1.14  $    1.10  $    1.03  $    1.03   $    1.00   $    2.15  $    1.80
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
Unit value, end of period........  $    1.24  $    1.19  $    1.14  $    1.10  $    1.03   $    1.03   $    2.02  $    2.15
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
Thousands of accumulation units
 outstanding, end of period......      3,164      2,355      2,129      1,447      1,132         747      63,176     71,468
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------       -----   ---------  ---------
 
<CAPTION>
 
                                     1996       1995        1994*
                                   ---------  ---------  -----------
<S>                                <C>        <C>        <C>
Unit value, beginning of
 period..........................  $    1.43  $    1.05   $    1.00
                                   ---------  ---------       -----
                                   ---------  ---------       -----
Unit value, end of period........  $    1.80  $    1.43   $    1.05
                                   ---------  ---------       -----
                                   ---------  ---------       -----
Thousands of accumulation units
 outstanding, end of period......     49,800     20,858       9,145
                                   ---------  ---------       -----
                                   ---------  ---------       -----
</TABLE>
<TABLE>
<CAPTION>
                                                                           SCUDDER BOND FUND
                                   -------------------------------------------------------------------------------------------------
                                     1998       1997       1996       1995       1994       1993       1992       1991       1990
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year....  $   12.37  $   11.48  $   11.30  $    9.69  $   10.32  $    9.30  $    8.78  $    7.54  $    7.05
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Unit value, end of year..........  $   13.02  $   12.37  $   11.48  $   11.30  $    9.69  $   10.32  $    9.30  $    8.78  $    7.54
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Thousands of accumulation units
 outstanding, end of year........      1,757      1,484      1,362      1,269      1,169      1,277      1,053        600        354
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
                                     1989
                                   ---------
<S>                                <C>
Unit value, beginning of year....  $    6.39
                                   ---------
                                   ---------
Unit value, end of year..........  $    7.05
                                   ---------
                                   ---------
Thousands of accumulation units
 outstanding, end of year........        221
                                   ---------
                                   ---------
</TABLE>
<TABLE>
<CAPTION>
                                                                      SCUDDER CAPITAL GROWTH FUND
                                   -------------------------------------------------------------------------------------------------
                                     1998       1997       1996       1995       1994       1993       1992       1991       1990
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year....  $   29.64  $   22.11  $   18.64  $   14.67  $   16.46  $   13.80  $   13.09  $    9.48  $   10.35
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Unit value, end of year..........  $   36.07  $   29.64  $   22.11  $   18.64  $   14.67  $   16.46  $   13.80  $   13.09  $    9.48
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Thousands of accumulation units
 outstanding, end of year........     11,462     11,094      9,266      8,556      8,121      6,582      3,698      2,138      1,103
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
                                     1989
                                   ---------
<S>                                <C>
Unit value, beginning of year....  $    8.53
                                   ---------
                                   ---------
Unit value, end of year..........  $   10.35
                                   ---------
                                   ---------
Thousands of accumulation units
 outstanding, end of year........        844
                                   ---------
                                   ---------
</TABLE>
<TABLE>
<CAPTION>
                                                                      SCUDDER INTERNATIONAL FUND
                                   -------------------------------------------------------------------------------------------------
                                     1998       1997       1996       1995       1994       1993       1992       1991       1990
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year....  $   14.46  $   13.43  $   11.85  $   10.80  $   11.06  $    8.13  $    8.48  $    7.68  $    8.41
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Unit value, end of year..........  $   16.93  $   14.46  $   13.43  $   11.85  $   10.80  $   11.06  $    8.13  $    8.48  $    7.68
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Thousands of accumulation units
 outstanding, end of year........      8,004      8,205      7,688      7,269      8,610      5,400      2,262      1,849      1,644
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
                                     1989
                                   ---------
<S>                                <C>
Unit value, beginning of year....  $    6.14
                                   ---------
                                   ---------
Unit value, end of year..........  $    8.41
                                   ---------
                                   ---------
Thousands of accumulation units
 outstanding, end of year........        721
                                   ---------
                                   ---------
</TABLE>
<TABLE>
<CAPTION>
                                                                                                                           FIDELITY
                                                                                                                            VIP II
                                                                                                                             ASSET
                                                  FIDELITY VIP                                                              MANAGER
                                               EQUITY-INCOME FUND                     FIDELITY VIP II CONTRA FUND            FUND
                                   ------------------------------------------  ------------------------------------------  ---------
                                     1998       1997       1996       1995*      1998       1997       1996       1995*      1998
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Unit value, beginning of
 period..........................  $   27.77  $   21.93  $   19.43  $   16.30  $   20.36  $   16.59  $   13.85  $   11.43  $   21.14
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Unit value, end of period........  $   30.65  $   27.77  $   21.93  $   19.43  $   26.16  $   20.36  $   16.59  $   13.85  $   24.04
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Thousands of accumulation units
 outstanding, end of period......      4,018      3,491      2,342        728      6,742      5,656      3,880      1,792      1,488
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
                                     1997       1996       1995*
                                   ---------  ---------  ---------
<S>                                <C>        <C>        <C>
Unit value, beginning of
 period..........................  $   17.72  $   15.66  $   14.04
                                   ---------  ---------  ---------
                                   ---------  ---------  ---------
Unit value, end of period........  $   21.14  $   17.72  $   15.66
                                   ---------  ---------  ---------
                                   ---------  ---------  ---------
Thousands of accumulation units
 outstanding, end of period......      1,150        613        184
                                   ---------  ---------  ---------
                                   ---------  ---------  ---------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                   CALVERT SOCIAL BALANCED FUND
                                   --------------------------------------------------------------------------------------------
                                     1998       1997       1996       1995       1994        1993         1992         1991*
                                   ---------  ---------  ---------  ---------  ---------  -----------  -----------  -----------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>          <C>          <C>
Unit value, beginning of
 period..........................  $    2.65  $    2.23  $    2.01  $    1.57  $    1.64   $    1.54    $    1.44    $    1.32
                                   ---------  ---------  ---------  ---------  ---------       -----        -----        -----
                                   ---------  ---------  ---------  ---------  ---------       -----        -----        -----
Unit value, end of period........  $    3.04  $    2.65  $    2.23  $    2.01  $    1.57   $    1.64    $    1.54    $    1.44
                                   ---------  ---------  ---------  ---------  ---------       -----        -----        -----
                                   ---------  ---------  ---------  ---------  ---------       -----        -----        -----
Thousands of accumulation units
 outstanding, end of period......     14,257     12,479     10,713      7,849      5,986       5,151        2,742          678
                                   ---------  ---------  ---------  ---------  ---------       -----        -----        -----
                                   ---------  ---------  ---------  ---------  ---------       -----        -----        -----
</TABLE>
<TABLE>
<CAPTION>
                                                             AMERICAN CENTURY VP CAPITAL APPRECIATION FUND
                                   -------------------------------------------------------------------------------------------------
                                     1998       1997       1996       1995       1994       1993       1992       1991       1990
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year....  $   11.04  $   11.53  $   12.18  $    9.39  $    9.61  $    8.81  $    9.01  $    6.40  $    6.53
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Unit value, end of year..........  $   10.69  $   11.04  $   11.53  $   12.18  $    9.39  $    9.61  $    8.81  $    9.01  $    6.40
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Thousands of accumulation units
 outstanding, end of year........      3,303      4,510      7,264      8,061      6,361      5,946      5,280      3,056      1,518
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                   ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
                                     1989
                                   ---------
<S>                                <C>
Unit value, beginning of year....  $    5.11
                                   ---------
                                   ---------
Unit value, end of year..........  $    6.53
                                   ---------
                                   ---------
Thousands of accumulation units
 outstanding, end of year........        791
                                   ---------
                                   ---------
</TABLE>
 
* The dates the Funds of the Separate Account commenced operation are as
  follows: Investment Company Money Market, All America, Bond and Composite
  Funds--January 1, 1985; Scudder Capital Growth, Bond and International Funds
  and American Century VP Capital Appreciation Fund--January 3, 1989; Calvert
  Social Balanced Fund--May 13, 1991; Investment Company Equity Index,
  Short-Term Bond and Mid-Term Bond Funds--February 5, 1993; Investment Company
  Aggressive Equity Fund--May 2, 1994; Fidelity VIP Equity-Income Fund and
  Fidelity VIP II Contra and Asset Manager Funds--May 1, 1995; and Investment
  Company Mid-Cap Equity Index Fund--May 1, 1999.
 
                                       38
<PAGE>
- --------------------------------------------------------------------------------
 
                      STATEMENT OF ADDITIONAL INFORMATION
                                FOR THRIFT PLAN
                    VARIABLE ACCUMULATION ANNUITY CONTRACTS
 
                                   Issued By
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
                    320 Park Avenue New York, New York 10022
 
                                  Through its
                             SEPARATE ACCOUNT NO. 2
     ---------------------------------------------------------------------
 
This Statement of Additional Information expands upon subjects we discuss in the
current Prospectus for the Thrift Plan Contract (CONTRACT) that we offer.
 
You may obtain a copy of the Prospectus, dated May 1, 1999, by calling
1-800-468-3785, or by writing to us at 320 Park Avenue, New York, New York
10022, Attn: Eldon Wonacott. The Prospectus contains definitions of various
terms, and we incorporate those terms by reference into this Statement of
Additional Information.
 
THIS STATEMENT OF ADDITIONAL INFORMATION IS NOT A PROSPECTUS AND YOU SHOULD READ
IT IN CONJUNCTION WITH THE PROSPECTUS FOR THE CONTRACT.
                               TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                    <C>
                                                                            PAGE
                                                                       ---------
Distribution of the Contracts........................................          2
Calculation of Accumulation Unit Values..............................          2
Yield and Performance Information....................................          2
Safekeeping of Separate Account Assets...............................          7
State Regulation.....................................................          7
Periodic Reports.....................................................          8
Legal Proceedings....................................................          8
Legal Matters........................................................          8
Experts..............................................................          8
Additional Information...............................................          9
Financial Statements.................................................          9
</TABLE>
 
- --------------------------------------------------------------------------------
 
DATED: MAY 1, 1999
<PAGE>
                         DISTRIBUTION OF THE CONTRACTS
- --------------------------------------------------------------------------------
 
We offer the Contracts for sale on a continuous basis through certain of our
employees. The only compensation we pay for sales of the Contracts is in the
form of salary. We also serve as principal underwriter of the Contracts.
 
We are registered with the Securities and Exchange Commission ("Commission") as
a broker-dealer and are a member of the National Association of Securities
Dealers, Inc. All persons engaged in selling the Contracts are our licensed
agents and are duly qualified registered representatives.
                    CALCULATION OF ACCUMULATION UNIT VALUES
- --------------------------------------------------------------------------------
 
When a Participant allocates or transfers Account Balance to a Separate Account
Fund, the Participant's interest in the Fund is represented by Accumulation
Units. Each Fund's Accumulation Units have a different value, based on the value
of the Fund's investment in shares of the related Underlying Fund and the
charges we deduct from the Separate Account. To determine the change in a Fund's
Accumulation Unit value from the close of one Valuation Day to the close of the
next Valuation Day (which we call a Valuation Period), we use an Accumulation
Unit Change Factor. The Accumulation Unit Change Factor for each Fund of the
Separate Account for any Valuation Period is:
 
 (a) the ratio of (i) the asset value of that Fund at the end of the current
     Valuation Period, before any amounts are allocated to or withdrawn from the
     Fund with respect to that Valuation Period, to (ii) the asset value of the
     Fund at the end of the preceding Valuation Period, after all allocations
     and withdrawals were made for that period,
 
divided by
 
 (b) 1.000000 plus the component of the annual rate of mortality and expense
     risk, distribution expense and Separate Account administrative charges
     against the Fund's assets for the number of days from the end of the
     preceding Valuation Period to the end of the current Valuation Period.
                       YIELD AND PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
MONEY MARKET FUND
- --------------------------------------------------------------------------------
 
Regulations adopted by the Commission require us to disclose the current
annualized yield of the Money Market Fund of the Separate Account for a
seven-day period in a manner that does not take into consideration any realized
or unrealized gains or losses on shares of the Money Market Fund of the
Investment Company or on its portfolio securities. This is called YIELD. The
Commission also permits us to disclose the effective yield of the Money Market
Fund of the Separate Account for the same seven-day period, determined on a
compounded basis. This is called the EFFECTIVE YIELD.
 
Yield and effective yield reflect our deductions from the Separate Account Fund
for administrative and distribution expenses or services and the mortality and
expense risk charge accrued during the period. Because of these deductions, the
yield for the Money Market Fund
 
                                     - 2 -
<PAGE>
of the Separate Account will be lower than the yield for the Money Market Fund
of the Investment Company.
 
From time to time, we will include quotations of the yield or performance of the
Separate Account's Money Market Fund in advertisements, sales literature or
shareholder reports. These performance figures are calculated in the following
manner:
 
 A. YIELD is the net annualized yield based on a specified seven calendar-days
    calculated at simple interest rates. Yield is calculated by determining the
    net change, exclusive of capital changes, in the value of a hypothetical
    preexisting account having a balance of one accumulation unit at the
    beginning of the period and dividing the difference by the value of the
    account at the beginning of the base period to obtain the base period
    return. The yield is annualized by multiplying the base period return by
    365/7. The yield figure is stated to the nearest hundredth of one percent.
 
 B. EFFECTIVE YIELD is the net annualized yield for a specified seven calendar
    days, assuming a reinvestment of the income (compounding). Effective yield
    is calculated by the same method as yield, except the yield figure is
    compounded by adding 1, raising the sum to a power equal to 365 divided by
    7, and subtracting one from the result, according to the following formula:
 
    Effective Yield = [(Base Period Return +1)(365/7)]-1.
 
The current yield of the Money Market Fund of the Separate Account for the
seven-day period ended December 29, 1998 was 3.61%.
 
Yield and effective yield are based on historical earnings and show the
performance of a hypothetical investment. The yield on amounts held in the Money
Market Fund of the Separate Account normally will fluctuate on a daily basis,
and therefore the yield for any past period is not an indication or
representation of future yield. The Money Market Fund's actual yield and
effective yield are affected by changes in interest rates on money market
securities, average portfolio maturity of the Money Market Fund of the
Investment Company, the types and quality of portfolio securities held by the
Money Market Fund of the Investment Company, and its operating expenses.
 
When communicating total return to current or prospective Participants, we also
may compare the Money Market Fund's figures to the performance of other variable
annuity accounts tracked by mutual fund rating services or to unmanaged indices
that may assume reinvestment of dividends but generally do not reflect
deductions for administrative and management costs.
 
BOND FUNDS
- --------------------------------------------------------------------------------
 
From time to time, we may include quotations of the yield of the Separate
Account's Investment Company Bond Funds and Scudder Bond Fund in advertisements,
sales literature or shareholder reports. Yield is computed by annualizing net
investment income, as determined by the Commission's formula, calculated on a
per Accumulation Unit basis, for a recent one month or 30-day period and
dividing that amount by the unit value of the Fund at the end of the period.
 
                                     - 3 -
<PAGE>
FUNDS OTHER THAN MONEY MARKET
- --------------------------------------------------------------------------------
 
From time to time, we may include quotations of a Fund's TOTAL RETURN in
advertisements, sales literature or shareholder reports. These performance
figures are calculated in the following manner:
 
 A. AVERAGE ANNUAL TOTAL RETURN is the average annual compounded rate of return
    for the periods of one year, five years and ten years, if applicable, all
    ended on the date of a recent calendar quarter. In addition, the total
    return for the life of the Fund is given. Total return quotations reflect
    changes in the price of a Fund's shares and assume that all dividends and
    capital gains distributions during the respective periods were reinvested in
    Fund shares. Total return is calculated by finding the average annual
    compounded rates of return of a hypothetical investment over such periods,
    according to the following formula (total return is then expressed as a
    percentage):
 
    T = (ERV/P)(1/n) - 1
 
Where:
 
    P = a hypothetical initial payment of $1,000
    T = average annual total return
    n = number of years
    ERV = ending redeemable value: ERV is the value, at the end of the
          applicable period, of a hypothetical $1,000 investment made at the
          beginning of the applicable period.
 
B.CUMULATIVE TOTAL RETURN is the compound rate of return on a hypothetical
  initial investment of $1,000 for a specified period. Cumulative total return
  quotations reflect changes in the value of a Fund's unit values and assume
  that all dividends and capital gains distributions during the period were
  reinvested in Fund shares. Cumulative total return is calculated by finding
  the compound rates of return of a hypothetical investment over such periods,
  according to the following formula (cumulative total return is then expressed
  as a percentage):
 
    C = (ERV/P) - 1.
 
Where:
 
    C = Cumulative Total Return
    P = hypothetical initial payment of $1,000
    ERV = ending redeemable value: ERV is the value, at the end of the
          applicable period, of a hypothetical $1,000 investment made at the
          beginning of the applicable period.
 
                                     - 4 -
<PAGE>
                          AVERAGE ANNUAL TOTAL RETURN
                      FOR PERIODS ENDED DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                                                                                  INCEPTION
FUND                                                      ONE YEAR     FIVE YEARS    TEN YEARS   LIFE OF FUND       DATE
- -------------------------------------------------------  -----------  ------------  -----------  -------------  -------------
<S>                                                      <C>          <C>           <C>          <C>            <C>
Investment Company Equity Index........................       26.6%         22.0%       N/A            19.2%        02/05/93
Investment Company All America.........................       19.4%         18.9%        14.7%         15.1%        01/01/85
Investment Company Aggressive Equity...................       (6.6)%      N/A           N/A             15.9  %     05/02/94
Investment Company Composite...........................       12.7  %       10.5  %      10.6  %        11.1  %     01/01/85
Investment Company Bond................................        5.6  %        5.6  %       7.5  %         7.6  %     01/01/85
Investment Company Mid-Term Bond.......................        4.8  %        4.3  %     N/A              4.6  %     02/05/93
Investment Company Short-Term Bond.....................        4.1  %        3.6  %     N/A              3.5  %     02/05/93
Scudder Capital Growth.................................       21.4  %       16.7  %      15.1  %        15.1  %     01/03/89
Scudder Bond...........................................        5.0  %        4.5  %       7.0  %         7.0  %     01/03/89
Scudder International..................................       16.7  %        8.6  %      10.3  %        10.3  %     01/03/89
Fidelity VIP Equity-Income.............................       10.1  %     N/A           N/A             18.5  %     05/01/95
Fidelity VIP II Contra.................................       28.1  %     N/A           N/A             25.0  %     05/01/95
Fidelity VIP II Asset Manager..........................       13.4  %     N/A           N/A             15.5  %     05/01/95
Calvert Social Balanced................................       14.5  %       12.9  %     N/A             12.2  %     05/23/93
American Century VP Capital Appreciation...............       (3.4  )%        1.9  %       7.3  %         6.6  %     01/03/89
</TABLE>
 
                            CUMULATIVE TOTAL RETURNS
                      FOR PERIODS ENDED DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                                                                              INCEPTION
FUND                                                    ONE YEAR    FIVE YEARS    TEN YEARS   LIFE OF FUND      DATE
- -----------------------------------------------------  -----------  -----------  -----------  ------------  -------------
<S>                                                    <C>          <C>          <C>          <C>           <C>
Investment Company Equity Index......................       26.6%       169.8%       N/A           182.7%       02/05/93
Investment Company All America.......................       19.4%       138.1%       294.1%        652.6%       01/01/85
Investment Company Aggressive Equity.................       (6.6)%      N/A          N/A            99.2  %     05/02/94
Investment Company Composite.........................       12.7  %      65.1  %     175.1  %      335.4  %     01/01/85
Investment Company Bond..............................        5.6  %      41.2  %     105.1  %      180.3  %     01/01/85
Investment Company Mid-Term Bond.....................        4.8  %      23.4  %     N/A            30.6  %     02/05/93
Investment Company Short-Term Bond...................        4.1  %      19.1  %     N/A            22.8  %     02/05/93
Scudder Capital Growth...............................       21.4  %     116.4  %     309.2  %      309.2  %     01/03/89
Scudder Bond.........................................        5.0  %      24.7  %      97.1  %       97.1  %     01/03/89
Scudder International................................       16.7  %      51.2  %     165.8  %      165.8  %     01/03/89
Fidelity VIP Equity-Income...........................       10.1  %     N/A          N/A            86.4  %     05/01/95
Fidelity VIP II Contra...............................       28.1  %     N/A          N/A           126.7  %     05/01/95
Fidelity VIP II Asset Manager........................       13.4  %     N/A          N/A            69.2  %     05/01/95
Calvert Social Balanced..............................       14.5  %      83.2  %     N/A            51.1  %     05/13/91
American Century VP Capital Appreciation.............       (3.4  )%       9.9  %     101.9  %       89.5  %     01/03/89
</TABLE>
 
The returns for the All America Fund (previously called the "Stock Fund") prior
to May 1, 1994 reflect the results of the Underlying Fund prior to a change in
its investment objectives and policies and the addition of subadvisers on that
date. The commencement dates are for the Funds in Separate Account No. 2. The
Mid-Cap Equity Index Fund is not included in the tables because it commenced
operations on May 1, 1999.
 
                                     - 5 -
<PAGE>
The above figures for the Money Market and other Funds, both for average annual
total return and cumulative total return, reflect charges made to the Separate
Account, including a monthly service charge. In the above table, we deducted the
$2.00 monthly contract fee from each Separate Account Fund, calculated as a cost
per $1,000 based on the average Account Balance for all of our individually
allocated contracts. For any Participant, the actual treatment of the monthly
contract fee and its effect on total return will depend on the Participant's
actual allocation of Account Balance.
 
If you have Account Balance in the General Account, the monthly contract fee
would be deducted from the General Account, not any Separate Account Fund.
Accordingly, the illustration of your Account Balance held in any of the Funds
of the Separate Account would experience a higher total return than shown above.
If you do not have Account Balance allocated to the General Account, but you do
have Account Balance allocated to more than one Fund of the Separate Account,
the fee would only be deducted from one of the Funds so that an illustration of
total return figures of the other Funds would be higher than shown above and the
Separate Account Fund from which the fee was deducted would illustrate a lower
total return than shown above.
 
If you do not have any Account Balance in the General Account, we will deduct
the $2.00 monthly charge from your Account Balance allocated to one or more of
the Separate Account Funds, in the following order:
 
(a) Investment Company Money Market Fund,
 
(b) Investment Company Short-Term Bond Fund,
 
(c) Investment Company Mid-Term Bond Fund,
 
(d) Investment Company Bond Fund,
 
(e) Scudder Bond Fund,
 
(f) Investment Company Composite Fund,
 
(g) Fidelity VIP II Asset Manager Fund,
 
(h) Calvert Social Balanced Fund,
 
(i) Fidelity VIP Equity-Income Fund,
 
(j) Investment Company All America Fund,
 
(k) Investment Company Equity Index Fund,
 
(l) Investment Company Mid-Cap Equity Index Fund,
 
(m) Fidelity VIP II Contra Fund,
 
(n) Investment Company Aggressive Equity Fund,
 
(o) Scudder Capital Growth Fund,
 
(p) Scudder International Fund, and
 
(q) American Century VP Capital Appreciation Fund.
 
Performance figures are based on historical earnings and are not guaranteed to
reoccur. They are not necessarily indicative of the future investment
performance of a particular Fund. Total return and yield for a Fund will vary
based on changes in market conditions and the
 
                                     - 6 -
<PAGE>
performance of the Underlying Fund. Unit values will fluctuate so that, when
redeemed, they may be worth more or less than their original cost.
 
When communicating total return to current or prospective Participants, we also
may compare a Fund's figures to the performance of other variable annuity
accounts tracked by mutual fund rating services or to unmanaged indices that may
assume reinvestment of dividends but generally do not reflect deductions for
administrative and management costs.
                     SAFEKEEPING OF SEPARATE ACCOUNT ASSETS
- --------------------------------------------------------------------------------
 
We hold title to the Separate Account's assets, including shares of the
Underlying Funds. We maintain records of all purchases and redemptions of
Underlying Fund shares by each of the Separate Account Funds.
                                STATE REGULATION
- --------------------------------------------------------------------------------
 
We are subject to regulation by the New York State Superintendent of Insurance
("Superintendent") as well as by the insurance departments of all the other
states and jurisdictions in which we does business.
 
We must file with the Superintendent an annual statement on a form specified by
the National Association of Insurance Commissioners. We also must file with New
York and other states a separate statement covering the separate accounts that
we maintain, including the Separate Account. Our books and assets are subject to
review and examination by the Superintendent and the Superintendent's agents at
all times. The Superintendent makes a full examination into our affairs at least
every five years. Other states also may periodically conduct a full examination
of our operations.
 
The laws of New York and of other states in which we are licensed to transact
business specifically provide for regulation and supervision of the variable
annuity activities of life insurance companies. Regulations require certain
contract provisions and require us to obtain approval of contract forms. State
regulation does not involve any supervision or control over the investment
policies of the Separate Account, or the selection of investments therefor,
except for verification that any such investments are permissible under
applicable law. Generally, the states in which we do business apply the laws of
New York in determining permissible investments for us.
 
                                     - 7 -
<PAGE>
                                PERIODIC REPORTS
- --------------------------------------------------------------------------------
 
Prior to your Annuity Commencement Date, we will provide you, at least
quarterly, with a statement as of a specified date covering the period since the
last statement. The statement will set forth, for the covered period:
 
(1) Amounts added to your Account Balance, which will be Deferred Compensation
   deposits under 457 Contracts or Contributions under Thrift, IRA, FPA and TDA
   Contracts made by you or on your behalf, including
 
   -  the allocation of contributed amounts to the Separate and General
      Accounts;
 
   -  the date Deferred Compensation was deducted from your salary or the
      Contribution was made; and
 
   -  the date the amount was credited to your account.
 
(2) Interest accrued on amounts allocated for you to the General Account.
 
(3) The number and dollar value of Accumulation Units credited to you in each
   Fund of the Separate Account; and
 
(4) The total amounts of all withdrawals and transfers from the General Account
   and each Fund.
 
We have advised Employers that they should remit your Contributions to us within
seven days of the date the Contribution was withheld from your pay.
 
The statement we send to you also will specify your Account Balance available to
provide a periodic benefit, cash return or death benefit. We will transmit to
Participants, at least semi-annually, reports showing the financial condition of
the Separate Account and showing the schedules of investments held in each
Underlying Fund.
                               LEGAL PROCEEDINGS
- --------------------------------------------------------------------------------
 
We are engaged in litigation of various kinds, which in our judgment is not of
material importance in relation to our total assets. There are no legal
proceedings pending to which the Separate Account is a party.
                                 LEGAL MATTERS
- --------------------------------------------------------------------------------
 
All matters of applicable state law pertaining to the Contracts, including our
right to issue the Contracts, have been passed upon by Patrick A. Burns, Senior
Executive Vice President and General Counsel of Mutual of America. Legal matters
relating to Federal securities laws have been passed upon by Stanley M.
Lenkowicz, Senior Vice President and Deputy General Counsel of Mutual of
America.
                                    EXPERTS
- --------------------------------------------------------------------------------
 
Arthur Andersen LLP, our independent public accountants, have audited the
financial statements included in this Statement of Additional Information, as
indicated in their reports relating to the statements. We have included the
reports of Arthur Andersen LLP in reliance upon the authority of the firm as
experts in giving such reports.
 
                                     - 8 -
<PAGE>
                             ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
We have filed with the Commission a registration statement under the Securities
Act of 1933, as amended, concerning to the Contracts. Not all of the information
set forth in the registration statement, amendments and exhibits thereto has
been included in this Statement of Additional Information or in the current
Prospectus for the Contracts. Statements contained herein concerning the content
of the Contracts and other legal instruments are intended to be summaries. For a
complete statement of the terms of those documents, reference should be made to
the materials filed with the Commission. The Commission has an Internet web site
at http://www.sec.gov, or you may write to the Commission's Public Reference
Section, Washington, DC 20549-6009 and obtain copies upon payment of a
duplicating fee.
                              FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------
 
When you allocate Account Balance to the Separate Account Funds, the value of
the Account Balance in those Funds is impacted primarily by the investment
results of the Underlying Fund(s). Financial Statements of the Separate Account
for 1998 are included as follows:
 
Financial Statements of the Separate Account for 1998 are included as follows:
 
<TABLE>
<S>                                                                      <C>
Statement of Assets and Liabilities....................................         10
Statement of Operations................................................         12
Statements of Changes in Net Assets....................................         14
Notes to Financial Statements..........................................         17
Report of Independent Public Accountants...............................         23
</TABLE>
 
You should consider our financial statements included in this Statement of
Additional Information as bearing on our ability to meet our obligations under
the Contracts and to support our General Account.
 
Financial Statements of Mutual of America for 1998 are included as follows:
 
<TABLE>
<S>                                                                      <C>
Report of Independent Public Accountants...............................         24
Consolidated Statements of Financial Condition.........................         25
Consolidated Statements of Operations and Surplus......................         26
Consolidated Statements of Cash Flows..................................         27
Notes to Consolidated Financial Statements.............................         28
</TABLE>
 
                                     - 9 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
                      STATEMENT OF ASSETS AND LIABILITIES
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                                         MUTUAL OF AMERICA
                                                  ---------------------------------------------------------------
                                                  MONEY MARKET    ALL AMERICA     EQUITY INDEX         BOND
                                                      FUND            FUND            FUND             FUND
                                                  -------------  --------------  --------------  ----------------
<S>                                               <C>            <C>             <C>             <C>
Assets:
Investments in Mutual of America Investment
  Corporation at market value
  (Cost:
  Money Market Fund--$39,380,057
  All America Fund--$314,846,209
  Equity Index Fund--$208,860,111
  Bond Fund--$57,089,249)
  (Notes 1 and 2)...............................   $38,794,254   $  400,667,622  $  268,859,036   $   56,229,192
Due From (To) Mutual of America General
  Account.......................................        60,443       (1,972,421)        427,185           53,002
                                                  -------------  --------------  --------------  ----------------
Net Assets......................................   $38,854,697   $  398,695,201  $  269,286,221   $   56,282,194
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
Unit Value at December 31, 1998 (Note 5)........   $      2.03   $         8.09  $         2.86   $         3.17
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
Number of Units Outstanding at December 31, 1998
  (Note 5)......................................    19,121,114       49,275,431      94,019,102       17,745,706
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                         MUTUAL OF AMERICA
                                                  ---------------------------------------------------------------
                                                                                                    AGGRESSIVE
                                                   SHORT-TERM       MID-TERM       COMPOSITE          EQUITY
                                                    BOND FUND      BOND FUND          FUND             FUND
                                                  -------------  --------------  --------------  ----------------
<S>                                               <C>            <C>             <C>             <C>
Assets:
Investments in Mutual of America Investment
  Corporation at market value
  (Cost:
  Short-Term Bond Fund--$3,989,514
  Mid-Term Bond Fund--$10,128,129
  Composite Fund--$279,954,844
  Aggressive Equity Fund--$126,609,916)
  (Notes 1 and 2)...............................   $ 3,915,558   $    9,709,998  $  294,734,308   $  127,225,340
Due From (To) Mutual of America General
  Account.......................................        22,080          (15,440)        158,200          144,542
                                                  -------------  --------------  --------------  ----------------
Net Assets......................................   $ 3,937,638   $    9,694,558  $  294,892,508   $  127,369,882
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
Unit Value at December 31, 1998 (Note 5)........   $      1.24   $         1.32  $         4.93   $         2.02
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
Number of Units Outstanding at December 31, 1998
  (Note 5)......................................     3,164,391        7,325,150      59,833,037       63,175,525
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                     - 10 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
                      STATEMENT OF ASSETS AND LIABILITIES
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                                     SCUDDER                     AMERICAN CENTURY
                                                  ---------------------------------------------  ----------------
                                                                    CAPITAL                         VP CAPITAL
                                                      BOND           GROWTH      INTERNATIONAL     APPRECIATION
                                                      FUND            FUND            FUND             FUND
                                                  -------------  --------------  --------------  ----------------
<S>                                               <C>            <C>             <C>             <C>
Assets:
Investments in Scudder Portfolios and American
  Century VP Capital Appreciation Fund at market
  value
  (Cost:
  Scudder Bond Fund--$22,860,803
  Scudder Capital Growth Fund-- $269,953,351
  Scudder International Fund-- $122,545,170
  American Century VP Capital Appreciation
    Fund--$37,696,440)
  (Notes 1 and 2)...............................  $  22,876,887  $  413,363,547  $  135,499,688   $   35,269,693
Due From (To) Mutual of America General
  Account.......................................            989          91,296         (18,735)          24,550
                                                  -------------  --------------  --------------  ----------------
Net Assets......................................  $  22,877,876  $  413,454,843  $  135,480,953   $   35,294,243
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
Unit Value at December 31, 1998 (Note 5)........  $       13.02  $        36.07  $        16.93   $        10.69
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
Number of Units Outstanding at December 31, 1998
  (Note 5)......................................      1,757,491      11,462,117       8,004,295        3,302,870
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
</TABLE>
 
<TABLE>
<CAPTION>
                                                     CALVERT                         FIDELITY
                                                  -------------  ------------------------------------------------
                                                     SOCIAL           VIP            VIP II           VIP II
                                                    BALANCED     EQUITY-INCOME       CONTRA       ASSET MANAGER
                                                      FUND            FUND            FUND             FUND
                                                  -------------  --------------  --------------  ----------------
<S>                                               <C>            <C>             <C>             <C>
Assets:
Investments in Calvert Responsibly Invested
  Portfolio and Fidelity Portfolios at market
  value
  (Cost:
  Calvert Responsibly Invested Portfolio--
    $36,579,163
  VIP Equity-Income Fund--$102,105,966
  VIP II Contra Fund--$122,795,284
  VIP II Asset Manager Fund-- $32,517,836)
    (Notes 1 and 2).............................  $  43,340,973  $  123,143,902  $  175,975,729   $   35,916,658
Due From (To) Mutual of America General
  Account.......................................          9,166           9,264         359,027         (149,852)
                                                  -------------  --------------  --------------  ----------------
Net Assets......................................  $  43,350,139  $  123,153,166  $  176,334,756   $   35,766,806
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
Unit Value at December 31, 1998 (Note 5)........  $        3.04  $        30.65  $        26.16   $        24.04
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
Number of Units Outstanding at December 31, 1998
  (Note 5)......................................     14,257,171       4,018,401       6,741,574        1,487,673
                                                  -------------  --------------  --------------  ----------------
                                                  -------------  --------------  --------------  ----------------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                     - 11 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
                            STATEMENT OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1998
<TABLE>
<CAPTION>
                                                                           MUTUAL OF AMERICA
                                                     -------------------------------------------------------------
                                                     MONEY MARKET    ALL AMERICA   EQUITY INDEX         BOND
                                                         FUND           FUND           FUND             FUND
                                                     -------------  -------------  -------------  ----------------
<S>                                                  <C>            <C>            <C>            <C>
Investment Income and Expenses:
Income (Notes 1 and 4):
  Dividends........................................   $ 1,752,196   $  47,402,384  $  20,729,224   $    3,838,355
                                                     -------------  -------------  -------------  ----------------
Total income.......................................     1,752,196      47,402,384     20,729,224        3,838,355
                                                     -------------  -------------  -------------  ----------------
Expenses (Note 3):
  Fees.............................................       439,058       4,632,136      2,649,161          568,911
  Administrative Expenses..........................        71,769         178,081        121,206           65,912
                                                     -------------  -------------  -------------  ----------------
Total Expenses.....................................       510,827       4,810,217      2,770,367          634,823
                                                     -------------  -------------  -------------  ----------------
Net Investment Income (Loss).......................     1,241,369      42,592,167     17,958,857        3,203,532
                                                     -------------  -------------  -------------  ----------------
Net Realized and Unrealized Gain (Loss) on
  Investments (Note 1):
  Net realized gain (loss) on investments..........        94,044      10,190,529      3,546,239          196,930
  Net unrealized appreciation (depreciation) of
    investments....................................        (8,215)     12,779,143     26,951,145         (981,434)
                                                     -------------  -------------  -------------  ----------------
Net Realized and Unrealized Gain (Loss) on
  Investments......................................        85,829      22,969,672     30,497,384         (784,504)
                                                     -------------  -------------  -------------  ----------------
Net Increase (Decrease) in Net Assets Resulting
  from Operations..................................   $ 1,327,198   $  65,561,839  $  48,456,241   $    2,419,028
                                                     -------------  -------------  -------------  ----------------
                                                     -------------  -------------  -------------  ----------------
 
<CAPTION>
 
                                                                           MUTUAL OF AMERICA
                                                     -------------------------------------------------------------
                                                                                                     AGGRESSIVE
                                                      SHORT-TERM      MID-TERM       COMPOSITE         EQUITY
                                                       BOND FUND      BOND FUND        FUND             FUND
                                                     -------------  -------------  -------------  ----------------
<S>                                                  <C>            <C>            <C>            <C>
Investment Income and Expenses:
Income (Notes 1 and 4):
  Dividends........................................   $   179,684   $     508,247  $  12,314,050   $    1,141,598
                                                     -------------  -------------  -------------  ----------------
Total income.......................................       179,684         508,247     12,314,050        1,141,598
                                                     -------------  -------------  -------------  ----------------
Expenses (Note 3):
  Fees.............................................        41,775          92,737      3,545,242        1,700,257
  Administrative Expenses..........................         8,743          11,324        207,511           57,962
                                                     -------------  -------------  -------------  ----------------
Total Expenses.....................................        50,518         104,061      3,752,753        1,758,219
                                                     -------------  -------------  -------------  ----------------
Net Investment Income (Loss).......................       129,166         404,186      8,561,297         (616,621)
                                                     -------------  -------------  -------------  ----------------
Net Realized and Unrealized Gain (Loss) on
  Investments (Note 1):
  Net realized gain (loss) on investments..........         3,822         (28,267)       554,735         (632,431)
  Net unrealized appreciation (depreciation) of
    investments....................................        (6,616)        (46,309)    24,996,236       (8,050,244)
                                                     -------------  -------------  -------------  ----------------
Net Realized and Unrealized Gain (Loss) on
  Investments......................................        (2,794)        (74,576)    25,550,971       (8,682,675)
                                                     -------------  -------------  -------------  ----------------
Net Increase (Decrease) in Net Assets Resulting
  from Operations..................................   $   126,372   $     329,610  $  34,112,268   $   (9,299,296)
                                                     -------------  -------------  -------------  ----------------
                                                     -------------  -------------  -------------  ----------------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                     - 12 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
                            STATEMENT OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                                                          AMERICAN
                                                             SCUDDER                       CENTURY       CALVERT
                                            ------------------------------------------  -------------  ------------
                                                             CAPITAL                     VP CAPITAL       SOCIAL
                                                BOND         GROWTH      INTERNATIONAL  APPRECIATION     BALANCED
                                                FUND          FUND           FUND           FUND           FUND
                                            ------------  -------------  -------------  -------------  ------------
<S>                                         <C>           <C>            <C>            <C>            <C>
Investment Income and Expenses:
Income (Notes 1 and 4):
  Dividends...............................  $  1,222,480  $  21,046,614  $  15,648,053  $   2,169,052  $  3,132,097
                                            ------------  -------------  -------------  -------------  ------------
Total income..............................     1,222,480     21,046,614     15,648,053      2,169,052     3,132,097
                                            ------------  -------------  -------------  -------------  ------------
Expenses (Note 3):
  Fees....................................       252,137      4,669,765      1,625,423        406,935       475,473
  Administrative Expenses.................        36,639         95,388         16,719          8,081        60,528
                                            ------------  -------------  -------------  -------------  ------------
Total Expenses............................       288,776      4,765,153      1,642,142        415,016       536,001
                                            ------------  -------------  -------------  -------------  ------------
Net Investment Income (Loss)..............       933,704     16,281,461     14,005,911      1,754,036     2,596,096
                                            ------------  -------------  -------------  -------------  ------------
Net Realized and Unrealized Gain (Loss) on
  Investments (Note 1):
  Net realized gain (loss) on
    investments...........................       (12,188)     7,179,053      7,712,372     (1,068,586)      276,019
  Net unrealized appreciation
    (depreciation) of investments.........        56,186     46,681,634     (2,792,240)    (2,044,118)    2,332,229
                                            ------------  -------------  -------------  -------------  ------------
Net Realized and Unrealized Gain (Loss) on
  Investments.............................        43,998     53,860,687      4,920,132     (3,112,704)    2,608,248
                                            ------------  -------------  -------------  -------------  ------------
Net Increase (Decrease) in Net Assets
  Resulting from Operations...............  $    977,702  $  70,142,148  $  18,926,043  $  (1,358,668) $  5,204,344
                                            ------------  -------------  -------------  -------------  ------------
                                            ------------  -------------  -------------  -------------  ------------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                       FIDELITY
                                                                     --------------------------------------------
                                                                          VIP          VIP II          VIP II
                                                                     EQUITY-INCOME     CONTRA      ASSET MANAGER
                                                                         FUND           FUND            FUND
                                                                     -------------  -------------  --------------
<S>                                                                  <C>            <C>            <C>
Investment Income and Expenses:
Income (Notes 1 and 4):
  Dividends........................................................   $ 6,472,639   $   6,753,142   $  3,312,566
                                                                     -------------  -------------  --------------
Total income.......................................................     6,472,639       6,753,142      3,312,566
                                                                     -------------  -------------  --------------
Expenses (Note 3):
  Fees.............................................................     1,322,031       1,599,575        355,427
  Administrative Expenses..........................................       144,647          69,906         54,809
                                                                     -------------  -------------  --------------
Total Expenses.....................................................     1,466,678       1,669,481        410,236
                                                                     -------------  -------------  --------------
Net Investment Income (Loss).......................................     5,005,961       5,083,661      2,902,330
                                                                     -------------  -------------  --------------
Net Realized and Unrealized Gain (Loss) on Investments (Note 1):
  Net realized gain (loss) on investments..........................       853,854       2,644,396        (12,448)
  Net unrealized appreciation (depreciation) of investments........     4,356,202      27,595,754        895,986
                                                                     -------------  -------------  --------------
Net Realized and Unrealized Gain (Loss) on Investments.............     5,210,056      30,240,150        883,538
                                                                     -------------  -------------  --------------
Net Increase (Decrease) in Net Assets Resulting from Operations....   $10,216,017   $  35,323,811   $  3,785,868
                                                                     -------------  -------------  --------------
                                                                     -------------  -------------  --------------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                     - 13 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
                      STATEMENTS OF CHANGES IN NET ASSETS
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
 
<TABLE>
<CAPTION>
                                                             INVESTMENT COMPANY
                                 --------------------------------------------------------------------------
                                   MONEY MARKET FUND         ALL AMERICA FUND         EQUITY INDEX FUND
                                 ----------------------  ------------------------  ------------------------
                                    1998        1997        1998         1997         1998         1997
                                 ----------  ----------  -----------  -----------  -----------  -----------
<S>                              <C>         <C>         <C>          <C>          <C>          <C>
Increase (Decrease) in Net
 Assets:
From Operations:
  Net investment income
    (loss).....................  $1,241,369  $1,562,015  $42,592,167  $38,428,360  $17,958,857  $ 1,775,466
  Net realized gain (loss) on
    investments................      94,044     132,331   10,190,529    6,823,750    3,546,239    1,092,959
  Net unrealized appreciation
    (depreciation) of
    investments................      (8,215)   (446,463)  12,779,143   22,669,697   26,951,145   24,542,212
                                 ----------  ----------  -----------  -----------  -----------  -----------
Net Increase (Decrease) in net
 assets resulting from
 operations....................   1,327,198   1,247,883   65,561,839   67,921,807   48,456,241   27,410,637
                                 ----------  ----------  -----------  -----------  -----------  -----------
From Unit Transactions:
  Contributions................   7,176,418   5,788,009   33,052,837   31,724,926   38,144,487   22,975,557
  Withdrawals..................  (4,295,360) (4,229,179) (27,468,692) (21,956,687) (16,569,868)  (6,932,093)
  Net transfers................   1,797,850  (2,770,906) (19,139,304)     360,521   44,795,692   49,789,027
                                 ----------  ----------  -----------  -----------  -----------  -----------
Net Increase (Decrease) from
 unit transactions.............   4,678,908  (1,212,076) (13,555,159)  10,128,760   66,370,311   65,832,511
                                 ----------  ----------  -----------  -----------  -----------  -----------
Net Increase (Decrease) in Net
 Assets........................   6,006,106      35,807   52,006,680   78,050,567  114,826,552   93,243,148
Net Assets:
Beginning of Year..............  32,848,591  32,812,784  346,688,521  268,637,954  154,459,669   61,216,521
                                 ----------  ----------  -----------  -----------  -----------  -----------
End of Year....................  $38,854,697 $32,848,591 $398,695,201 $346,688,521 $269,286,221 $154,459,669
                                 ----------  ----------  -----------  -----------  -----------  -----------
                                 ----------  ----------  -----------  -----------  -----------  -----------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                 INVESTMENT COMPANY
                                         ------------------------------------------------------------------
                                               BOND FUND         SHORT-TERM BOND FUND   MID-TERM BOND FUND
                                         ----------------------  --------------------  --------------------
                                            1998        1997       1998       1997       1998       1997
                                         ----------  ----------  ---------  ---------  ---------  ---------
<S>                                      <C>         <C>         <C>        <C>        <C>        <C>
Increase (Decrease) in Net Assets:
From Operations:
  Net investment income (loss).........  $3,203,532  $1,945,958  $ 129,166  $ 133,338  $ 404,186  $ 278,336
  Net realized gain (loss) on
    investments........................     196,930     111,901      3,822     17,305    (28,267)   (98,969)
  Net unrealized appreciation
    (depreciation) of investment.......    (981,434)    889,880     (6,616)   (40,822)   (46,309)   101,700
                                         ----------  ----------  ---------  ---------  ---------  ---------
Net Increase (Decrease) in net assets
 resulting from operations.............   2,419,028   2,947,739    126,372    109,821    329,610    281,067
                                         ----------  ----------  ---------  ---------  ---------  ---------
From Unit Transactions:
  Contributions........................   7,033,074   4,701,303    734,187    668,221  1,120,290    813,398
  Withdrawals..........................  (4,982,221) (4,020,196)  (427,168)  (647,104)  (627,755)  (586,994)
  Net transfers........................  13,841,212    (136,699)   696,139    252,496  3,231,316    585,047
                                         ----------  ----------  ---------  ---------  ---------  ---------
Net Increase (Decrease) from unit
 transactions..........................  15,892,065     544,408  1,003,158    273,613  3,723,851    811,451
                                         ----------  ----------  ---------  ---------  ---------  ---------
Net Increase (Decrease) in Net
 Assets................................  18,311,093   3,492,147  1,129,530    383,434  4,053,461  1,092,518
Net Assets:
Beginning of Year......................  37,971,101  34,478,954  2,808,108  2,424,674  5,641,097  4,548,579
                                         ----------  ----------  ---------  ---------  ---------  ---------
End of Year............................  $56,282,194 $37,971,101 $3,937,638 $2,808,108 $9,694,558 $5,641,097
                                         ----------  ----------  ---------  ---------  ---------  ---------
                                         ----------  ----------  ---------  ---------  ---------  ---------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                     - 14 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
                      STATEMENTS OF CHANGES IN NET ASSETS
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
 
<TABLE>
<CAPTION>
                                                                           INVESTMENT COMPANY
                                                           --------------------------------------------------
                                                                COMPOSITE FUND        AGGRESSIVE EQUITY FUND
                                                           ------------------------  ------------------------
                                                              1998         1997         1998         1997
                                                           -----------  -----------  -----------  -----------
<S>                                                        <C>          <C>          <C>          <C>
Increase (Decrease) in Net Assets:
From Operations:
  Net investment income (loss)...........................  $ 8,561,297  $55,725,648  $  (616,621) $13,631,161
  Net realized gain (loss) on investments................      554,735    3,228,464     (632,431)     808,445
  Net unrealized appreciation (depreciation) of
    investments..........................................   24,996,236  (20,441,501)  (8,050,244)   5,321,047
                                                           -----------  -----------  -----------  -----------
Net Increase (Decrease) in net assets resulting from
 operations..............................................   34,112,268   38,512,611   (9,299,296)  19,760,653
                                                           -----------  -----------  -----------  -----------
From Unit Transactions:
  Contributions..........................................   25,635,215   23,905,684   28,696,822   29,301,342
  Withdrawals............................................  (23,076,061) (24,479,468) (12,588,115)  (9,246,392)
  Net transfers..........................................   (9,295,063) (20,666,992) (33,256,371)  24,458,890
                                                           -----------  -----------  -----------  -----------
Net Increase (Decrease) from unit transactions...........   (6,735,909) (21,240,776) (17,147,664)  44,513,840
                                                           -----------  -----------  -----------  -----------
Net Increase (Decrease) in Net Assets....................   27,376,359   17,271,835  (26,446,960)  64,274,493
Net Assets:
Beginning of Year........................................  267,516,149  250,244,314  153,816,842   89,542,349
                                                           -----------  -----------  -----------  -----------
End of Year..............................................  $294,892,508 $267,516,149 $127,369,882 $153,816,842
                                                           -----------  -----------  -----------  -----------
                                                           -----------  -----------  -----------  -----------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                        SCUDDER
                                       --------------------------------------------------------------------------
                                             BOND FUND           CAPITAL GROWTH FUND        INTERNATIONAL FUND
                                       ----------------------  ------------------------  ------------------------
                                          1998        1997        1998         1997         1998         1997
                                       ----------  ----------  -----------  -----------  -----------  -----------
<S>                                    <C>         <C>         <C>          <C>          <C>          <C>
Increase (Decrease) in Net Assets:
From Operations:
  Net investment income (loss).......  $  933,704  $  791,376  $16,281,461  $14,929,366  $14,005,911  $ 1,048,262
  Net realized gain (loss) on
    investments......................     (12,188)    (87,907)   7,179,053    3,989,169    7,712,372   10,918,585
  Net unrealized appreciation
    (depreciation) of investments....      56,186     447,914   46,681,634   53,719,471   (2,792,240)  (3,147,476)
                                       ----------  ----------  -----------  -----------  -----------  -----------
Net Increase (Decrease) in net assets
 resulting from operations...........     977,702   1,151,383   70,142,148   72,638,006   18,926,043    8,819,371
                                       ----------  ----------  -----------  -----------  -----------  -----------
From Unit Transactions:
  Contributions......................   3,111,360   2,487,844   45,075,165   34,121,380   15,352,696   15,851,344
  Withdrawals........................  (1,812,991) (1,538,662) (27,386,892) (19,076,131) (11,406,891)  (9,604,601)
  Net transfers......................   2,253,912     610,052   (3,209,197)  36,296,377   (6,070,868)     377,532
                                       ----------  ----------  -----------  -----------  -----------  -----------
Net Increase (Decrease) from unit
 transactions........................   3,552,281   1,559,234   14,479,076   51,341,626   (2,125,063)   6,624,275
                                       ----------  ----------  -----------  -----------  -----------  -----------
Net Increase (Decrease) in Net
 Assets..............................   4,529,983   2,710,617   84,621,224  123,979,632   16,800,980   15,443,646
Net Assets:
Beginning of Year....................  18,347,893  15,637,276  328,833,619  204,853,987  118,679,973  103,236,327
                                       ----------  ----------  -----------  -----------  -----------  -----------
End of Year..........................  $22,877,876 $18,347,893 $413,454,843 $328,833,619 $135,480,953 $118,679,973
                                       ----------  ----------  -----------  -----------  -----------  -----------
                                       ----------  ----------  -----------  -----------  -----------  -----------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                     - 15 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
                      STATEMENTS OF CHANGES IN NET ASSETS
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
 
<TABLE>
<CAPTION>
                                                                 AMERICAN CENTURY
                                                             ------------------------         CALVERT
                                                                                       ----------------------
                                                                    VP CAPITAL
                                                                APPRECIATION FUND       SOCIAL BALANCED FUND
                                                             ------------------------  ----------------------
                                                                1998         1997         1998        1997
                                                             -----------  -----------  ----------  ----------
<S>                                                          <C>          <C>          <C>         <C>
Increase (Decrease) in Net Assets:
From Operations:
  Net investment income (loss).............................  $ 1,754,036  $   710,068  $2,596,096  $1,887,424
  Net realized gain (loss) on investments..................   (1,068,586)   1,238,144     276,019     235,099
  Net unrealized appreciation (depreciation) of
    investments............................................   (2,044,118)  (4,227,421)  2,332,229   2,600,706
                                                             -----------  -----------  ----------  ----------
Net Increase (Decrease) in net assets resulting from
 operations................................................   (1,358,668)  (2,279,209)  5,204,344   4,723,229
                                                             -----------  -----------  ----------  ----------
From Unit Transactions:
  Contributions............................................    5,340,709    8,707,773   7,547,920   6,373,996
  Withdrawals..............................................   (4,483,088)  (6,920,015) (2,809,892) (2,497,692)
  Net transfers............................................  (13,981,957) (33,483,832)    365,285     521,192
                                                             -----------  -----------  ----------  ----------
Net Increase (Decrease) from unit transactions.............  (13,124,336) (31,696,074)  5,103,313   4,397,496
                                                             -----------  -----------  ----------  ----------
Net Increase (Decrease) in Net Assets......................  (14,483,004) (33,975,283) 10,307,657   9,120,725
Net Assets:
Beginning of Year..........................................   49,777,247   83,752,530  33,042,482  23,921,757
                                                             -----------  -----------  ----------  ----------
End of Year................................................  $35,294,243  $49,777,247  $43,350,139 $33,042,482
                                                             -----------  -----------  ----------  ----------
                                                             -----------  -----------  ----------  ----------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                        FIDELITY
                                        -------------------------------------------------------------------------
                                                  VIP                     VIP II                   VIP II
                                             EQUITY-INCOME                CONTRA               ASSET MANAGER
                                                 FUND                      FUND                     FUND
                                        -----------------------  ------------------------  ----------------------
                                           1998         1997        1998         1997         1998        1997
                                        -----------  ----------  -----------  -----------  ----------  ----------
<S>                                     <C>          <C>         <C>          <C>          <C>         <C>
Increase (Decrease) in Net Assets:
From Operations:
  Net investment income (loss)........  $ 5,005,961  $4,699,779  $ 5,083,661  $ 1,128,152  $2,902,330  $1,194,878
  Net realized gain (loss) on
    investments.......................      853,854     278,906    2,644,396      992,567     (12,448)     25,536
  Net unrealized appreciation
    (depreciation) of investments.....    4,356,202  11,806,259   27,595,754   16,333,421     895,986   1,637,367
                                        -----------  ----------  -----------  -----------  ----------  ----------
Net Increase (Decrease) in net assets
 resulting from operations............   10,216,017  16,784,944   35,323,811   18,454,140   3,785,868   2,857,781
                                        -----------  ----------  -----------  -----------  ----------  ----------
From Unit Transactions:
  Contributions.......................   22,499,025  16,485,680   25,700,149   21,050,465   8,419,597   5,663,920
  Withdrawals.........................   (9,180,957) (5,431,923) (11,133,735)  (6,172,824) (2,785,815) (1,306,235)
  Net transfers.......................    2,658,613  17,763,089   11,315,492   17,442,009   2,047,842   6,221,869
                                        -----------  ----------  -----------  -----------  ----------  ----------
Net Increase (Decrease) from unit
 transactions.........................   15,976,681  28,816,846   25,881,906   32,319,650   7,681,624  10,579,554
                                        -----------  ----------  -----------  -----------  ----------  ----------
Net Increase (Decrease) in Net
 Assets...............................   26,192,698  45,601,790   61,205,717   50,773,790  11,467,492  13,437,335
Net Assets:
Beginning of Year.....................   96,960,468  51,358,678  115,129,039   64,355,249  24,299,314  10,861,979
                                        -----------  ----------  -----------  -----------  ----------  ----------
End of Year...........................  $123,153,166 $96,960,468 $176,334,756 $115,129,039 $35,766,806 $24,299,314
                                        -----------  ----------  -----------  -----------  ----------  ----------
                                        -----------  ----------  -----------  -----------  ----------  ----------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                     - 16 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
 
                         NOTES TO FINANCIAL STATEMENTS
 
1. SIGNIFICANT ACCOUNTING POLICIES AND ORGANIZATION
 
Separate Account No. 2 of Mutual of America Life Insurance Company ("the
Company") was established in conformity with New York Insurance Law and
commenced operations on June 4, 1984. On October 31, 1986, Separate Account No.
2 was reorganized into a unit investment trust consisting of four Funds: the
Money Market Fund, the All America Fund, the Bond Fund and the Composite Fund.
These Funds invest in corresponding funds of Mutual of America Investment
Corporation ("Investment Company"). Prior to May 2, 1994, the All America Fund
was known as the Stock Fund and had different investment objectives and no
sub-advisors.
 
On January 3, 1989, the following funds became available to Separate Account No.
2 as investment alternatives: Scudder Bond, Scudder Capital Growth, Scudder
International and VP Capital Appreciation Fund. The Scudder Funds invest in
corresponding portfolios of Scudder Variable Life Investment Fund ("Scudder").
The VP Capital Appreciation Fund invests in a corresponding fund of American
Century Variable Portfolios Inc. ("American Century"). Effective May 13, 1991,
the Calvert Social Balanced Fund (formerly, Calvert Responsibly Invested
Balanced Portfolio) became available as an investment alternative. The Calvert
Social Balanced Fund invests in a corresponding fund of Calvert Social Balanced
Portfolio of Calvert Variable Series, Inc. (formerly, the Calvert Responsibly
Invested Balanced Portfolio of Acacia Capital Corporation) ("Calvert").
 
On February 5, 1993 the Mutual of America Equity Index, Short-Term Bond and
Mid-Term Bond funds became available to Separate Account No. 2 as investment
alternatives. On May 2, 1994 the Mutual of America Aggressive Equity Fund became
available. These funds invest in corresponding funds of the Investment Company.
 
On May 1, 1995, Fidelity Investments Equity-Income, Contrafund and Asset Manager
portfolios became available. The Fidelity Equity-Income Portfolio invests in a
corresponding portfolio of Fidelity Variable Insurance Products Fund and the
Contrafund Portfolio and Asset Manager Portfolio invest in corresponding
portfolios of Fidelity Variable Insurance Products Fund II (collectively,
"Fidelity").
 
Separate Account No. 2 was formed by the Company to support the operations of
the Company's group and individual variable accumulation annuity contracts
("Contracts"). The assets of Separate Account No. 2 are the property of the
Company. The portion of Separate Account No. 2's assets applicable to the
Contracts will not be charged with liabilities arising out of any other business
the Company may conduct.
 
The significant accounting policies of Separate Account No. 2 are as follows:
 
INVESTMENT VALUATION--Investments are made in shares of the Investment Company,
Scudder, American Century, Calvert and Fidelity and are valued at the reported
net asset values of the respective funds or portfolios.
 
INVESTMENT TRANSACTIONS--Investment transactions are recorded on the trade date.
Realized gains and losses on sales of investments are determined based on the
average cost of the investment sold.
 
                                     - 17 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
1. SIGNIFICANT ACCOUNTING POLICIES AND ORGANIZATION (CONTINUED)
FEDERAL INCOME TAXES--Separate Account No. 2 will be treated as a part of the
Company and will not be taxed separately as a "regulated investment company"
under existing law. The Company is taxed as a life insurance company under the
life insurance tax provisions of the Internal Revenue Code of 1986. No provision
for income taxes is required in the accompanying financial statements.
 
2. INVESTMENTS
 
The number of shares owned by Separate Account No. 2 and their respective net
asset values (rounded to the nearest cent) per share at December 31, 1998 are as
follows:
 
<TABLE>
<CAPTION>
                                                                   NUMBER OF      NET ASSET
                                                                     SHARES         VALUE
                                                                 --------------  -----------
<S>                                                              <C>             <C>
Investment Company Funds:
  Money Market Fund............................................      32,754,324   $    1.18
  All America Fund.............................................     138,352,892        2.90
  Equity Index Fund............................................     109,673,279        2.45
  Bond Fund....................................................      39,470,522        1.42
  Short-Term Bond Fund.........................................       3,804,353        1.03
  Mid-Term Bond Fund...........................................      10,667,632        0.91
  Composite Fund...............................................     165,687,292        1.78
  Aggressive Equity Fund.......................................      84,338,638        1.51
Scudder Portfolios:
  Bond Portfolio...............................................       3,325,129        6.88
  Capital Growth Portfolio--Class "A"..........................      17,259,438       23.95
  International Portfolio--Class "A"...........................       9,306,297       14.56
American Century VP Capital Appreciation Fund..................       3,910,166        9.02
Calvert Social Balanced Portfolio..............................      20,281,223        2.14
Fidelity Portfolios:
  Equity-Income--"Initial" Class...............................       4,844,371       25.42
  Contrafund--"Initial" Class..................................       7,200,316       24.44
  Asset Manager--"Initial" Class...............................       1,977,790       18.16
</TABLE>
 
3. EXPENSES
 
Administrative Charges--In connection with its administrative functions, the
Company deducts daily, at an annual rate of .40%, an amount from the value of
the net assets of all funds except the American Century VP Capital Appreciation
Fund for which the annual rate is .20% and each Fidelity fund, for which the
annual rate is .30%.
 
In addition, a deduction of up to $2.00 may be made at the end of each month
from a participant's account, except that such charge shall not exceed 1/12 of
1% of the balance in such account in any month.
 
Distribution Expense Charge--As principal underwriter, the Company performs all
distribution and sales functions and bears all distribution and sales expenses
relative to the Contracts. For
 
                                     - 18 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
3. EXPENSES (CONTINUED)
providing these services, the Company deducts daily, at an annual rate of .35%,
an amount from the value of the net assets of each fund to cover such expenses.
 
Mortality and Expense Risk Charge--The Company assumes the risk to make annuity
payments in accordance with annuity tables provided in the Contracts regardless
of how long a participant lives and also assumes certain expense risks
associated with such annuity payments. For assuming this risk, the Company
deducts daily, at an annual rate of .50%, an amount from the value of the net
assets of each fund.
 
4. DIVIDENDS
 
All dividend distributions are reinvested in additional shares of the respective
funds or portfolios at net asset value. On December 31, 1998 a dividend
distribution was made by the Investment Company to shareholders of record as of
December 30, 1998. Prior thereto, the Investment Company declared and paid a
dividend distribution on September 15, 1998. The combined amount of these
dividends was as follows:
 
<TABLE>
<S>                                                          <C>
Money Market Fund..........................................  $ 1,752,196
All America Fund...........................................   47,402,384
Equity Index Fund..........................................   20,792,224
Bond Fund..................................................    3,838,355
Short-Term Bond Fund.......................................      179,684
Mid-Term Bond Fund.........................................      508,247
Composite Fund.............................................   12,314,050
Aggressive Equity Fund.....................................    1,141,598
</TABLE>
 
On January 28, 1998, February 25, 1998, April 28, 1998, July 29, 1998 and
October 28, 1998, dividends were paid by the Scudder Bond Portfolio. The
combined amount of the dividends was $1,222,480.
 
On January 28, 1998, February 25, 1998, April 28, 1998, July 29, 1998 and
October 28, 1998, dividends were paid by the Scudder Capital Growth Portfolio.
The combined amount of the dividends was $21,046,614.
 
On February 25, 1998, a dividend was paid by the Scudder International
Portfolio. The amount of the dividend was $15,648,053.
 
On March 13, 1998, a dividend was paid by the American Century VP Capital
Appreciation Fund. The amount of the dividend was $2,169,052.
 
On December 30, 1998, a dividend was paid by the Calvert Social Balanced
Portfolio. The amount of the dividend was $3,132,097.
 
On February 6, 1998, a dividend was paid by the Fidelity Equity-Income
Portfolio. The amount of the dividend was $6,472,639.
 
On February 6, 1998, a dividend was paid by the Fidelity Contrafund Portfolio.
The amount of the dividend was $6,753,142.
 
                                     - 19 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
4. DIVIDENDS (CONTINUED)
On February 6, 1998, a dividend was paid by the Fidelity Asset Manager
Portfolio. The amount of the dividend was $3,312,566.
 
5. FINANCIAL HIGHLIGHTS
 
Shown below are financial highlights for a Unit outstanding throughout each of
the five years ended December 31, 1998, or, if not in existence a full year, the
initial period ended December 31:
<TABLE>
<CAPTION>
                                                                      INVESTMENT COMPANY MONEY MARKET FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $    1.95  $    1.87  $    1.80  $    1.72  $    1.68
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $    2.03  $    1.95  $    1.87  $    1.80  $    1.72
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................     19,121     16,831     17,511     17,502     17,653
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
                                                                       INVESTMENT COMPANY ALL AMERICA FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $    6.76  $    5.39  $    4.52  $    3.35  $    3.36
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $    8.09  $    6.76  $    5.39  $    4.52  $    3.35
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................     49,275     51,312     49,798     43,620     38,669
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                      INVESTMENT COMPANY EQUITY INDEX FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $    2.26  $    1.72  $    1.42  $    1.05  $    1.05
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $    2.86  $    2.26  $    1.72  $    1.42  $    1.05
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................     94,019     68,462     35,660     17,109      4,644
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                          INVESTMENT COMPANY BOND FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $    3.00  $    2.75  $    2.69  $    2.28  $    2.39
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $    3.17  $    3.00  $    2.75  $    2.69  $    2.28
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................     17,746     12,671     12,548     12,083     10,601
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                     INVESTMENT COMPANY SHORT-TERM BOND FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $    1.19  $    1.14  $    1.10  $    1.03  $    1.03
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $    1.24  $    1.19  $    1.14  $    1.10  $    1.03
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................      3,164      2,355      2,129      1,447      1,132
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
</TABLE>
 
                                     - 20 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
5. FINANCIAL HIGHLIGHTS (CONTINUED)
<TABLE>
<CAPTION>
                                                                      INVESTMENT COMPANY MID-TERM BOND FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $    1.26  $    1.19  $    1.16  $    1.01  $    1.06
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $    1.32  $    1.26  $    1.19  $    1.16  $    1.01
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................      7,325      4,478      3,828      2,848      1,444
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                        INVESTMENT COMPANY COMPOSITE FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $    4.36  $    3.75  $    3.39  $    2.82  $    2.95
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $    4.93  $    4.36  $    3.75  $    3.39  $    2.82
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................     59,833     61,359     66,715     70,558     73,239
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                    INVESTMENT COMPANY AGGRESSIVE EQUITY FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $    2.15  $    1.80  $    1.43  $    1.05  $    1.00
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $    2.02  $    2.15  $    1.80  $    1.43  $    1.05
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................     63,176     71,468     49,800     20,858      9,145
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                                SCUDDER BOND FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $   12.37  $   11.48  $   11.30  $    9.69  $   10.32
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $   13.02  $   12.37  $   11.48  $   11.30  $    9.69
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................      1,757      1,484      1,362      1,269      1,169
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                           SCUDDER CAPITAL GROWTH FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $   29.64  $   22.11  $   18.64  $   14.67  $   16.46
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $   36.07  $   29.64  $   22.11  $   18.64  $   14.67
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................     11,462     11,094      9,266      8,556      8,121
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                           SCUDDER INTERNATIONAL FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $   14.46  $   13.43  $   11.85  $   10.80  $   11.06
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $   16.93  $   14.46  $   13.43  $   11.85  $   10.80
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................      8,004      8,205      7,688      7,269      8,610
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
</TABLE>
 
                                     - 21 -
<PAGE>
                    MUTUAL OF AMERICA SEPARATE ACCOUNT NO. 2
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
5. FINANCIAL HIGHLIGHTS (CONTINUED)
<TABLE>
<CAPTION>
                                                                                AMERICAN CENTURY
                                                              -----------------------------------------------------
                                                                          VP CAPITAL APPRECIATION FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $   11.04  $   11.53  $   12.18  $    9.39  $    9.61
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $   10.69  $   11.04  $   11.53  $   12.18  $    9.39
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................      3,303      4,510      7,264      8,061      6,361
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                                     CALVERT
                                                              -----------------------------------------------------
                                                                              SOCIAL BALANCED FUND
                                                              -----------------------------------------------------
                                                                1998       1997       1996       1995       1994
                                                              ---------  ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $    2.65  $    2.23  $    2.01  $    1.57  $    1.64
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $    3.04  $    2.65  $    2.23  $    2.01  $    1.57
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................     14,257     12,479     10,713      7,849      5,986
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                               FIDELITY
                                                              ------------------------------------------
                                                                        VIP EQUITY-INCOME FUND
                                                              ------------------------------------------
                                                                1998       1997       1996       1995
                                                              ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $   27.77  $   21.93  $   19.43  $   16.30
                                                              ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $   30.65  $   27.77  $   21.93  $   19.43
                                                              ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................      4,018      3,491      2,342        728
                                                              ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                               FIDELITY
                                                              ------------------------------------------
                                                                          VIP II CONTRA FUND
                                                              ------------------------------------------
                                                                1998       1997       1996       1995
                                                              ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $   20.36  $   16.59  $   13.85  $   11.43
                                                              ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $   26.16  $   20.36  $   16.59  $   13.85
                                                              ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................      6,742      5,656      3,880      1,792
                                                              ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------
<CAPTION>
 
                                                                               FIDELITY
                                                              ------------------------------------------
                                                                      VIP II ASSET MANAGER FUND
                                                              ------------------------------------------
                                                                1998       1997       1996       1995
                                                              ---------  ---------  ---------  ---------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Unit value, beginning of year...............................  $   21.14  $   17.72  $   15.66  $   14.04
                                                              ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------
Unit value, end of year.....................................  $   24.04  $   21.14  $   17.72  $   15.66
                                                              ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------
Thousands of units outstanding, end of year.................      1,488      1,150        613        184
                                                              ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------
</TABLE>
 
                                     - 22 -
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To Mutual of America Life Insurance Company:
 
We have audited the accompanying statement of assets and liabilities of Mutual
of America Separate Account No. 2 as of December 31, 1998, and the related
statement of operations for the year then ended, the statements of changes in
net assets for each of the two years in the period then ended, and the financial
highlights for each of the five years in the period then ended. These financial
statements and financial highlights are the responsibility of the Separate
Account's management. Our responsibility is to express an opinion on these
financial statements and financial highlights 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 and financial highlights referred to
above present fairly, in all material respects, the financial position of Mutual
of America Separate Account No. 2 as of December 31, 1998, the results of its
operations for the year then ended, the changes in its net assets for each of
the two years in the period then ended, and the financial highlights for each of
the five years in the period then ended, in conformity with generally accepted
accounting principles.
 
        [SIGNATURE]
 
New York, New York
February 19, 1999
 
                                     - 23 -
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To Mutual of America Life Insurance Company:
 
We have audited the accompanying consolidated statements of financial condition
of Mutual of America Life Insurance Company and its subsidiaries as of December
31, 1998 and 1997, and the related consolidated statements of operations and
surplus and cash flows for the years then ended. 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.
 
As described in Note 1, the accompanying statutory-basis financial statements
were prepared in conformity with the accounting practices prescribed or
permitted by the State of New York Insurance Department which practices differ
from generally accepted accounting principles. The variances between such
practices and generally accepted accounting principles and the effects on the
accompanying financial statements are described in Note 9.
 
In our opinion, because of the effects of the matter described in the third
paragraph and more fully discussed in Note 9, the financial statements referred
to above do not present fairly, in conformity with generally accepted accounting
principles, the financial position of Mutual of America Life Insurance Company
and its subsidiaries as of December 31, 1998 and 1997, or the results of their
operations or their cash flows for the years then ended. Furthermore, in our
opinion, the supplemental data included in Note 9 reconciling net income and
surplus as shown in the financial statements to net income and surplus as
determined in conformity with generally accepted accounting principles, present
fairly, in all material respects, the information shown therein.
 
However, in our opinion, the statutory-basis consolidated financial statements
referred to above present fairly, in all material respects, the financial
position of Mutual of America Life Insurance Company and its subsidiaries as of
December 31, 1998 and 1997, and the results of their operations and their cash
flows for the years then ended in conformity with accounting practices
prescribed or permitted by the State of New York Insurance Department.
 
        [SIGNATURE]
 
New York, New York
February 19, 1999
 
                                     - 24 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
                 CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION
 
                           DECEMBER 31, 1998 AND 1997
 
<TABLE>
<CAPTION>
                                                                                1998                 1997
                                                                         -------------------  ------------------
<S>                                                                      <C>                  <C>
                                                     ASSETS
GENERAL ACCOUNT ASSETS
  Bonds and notes......................................................  $     4,874,244,008  $    4,795,022,564
  Common stocks........................................................          339,524,394         413,939,170
  Preferred stocks.....................................................           55,771,462          59,466,239
  Cash and short-term investments......................................           98,685,966          67,164,422
  Guaranteed funds transferable (Note 3)...............................          115,902,196         121,130,991
  Mortgage loans.......................................................           19,289,253          41,315,430
  Real estate..........................................................          324,024,030         331,991,341
  Policy loans.........................................................          100,633,395          97,854,314
  Other invested assets................................................           33,606,096          20,137,960
  Investment income accrued............................................           90,018,584          79,087,631
  Receivables..........................................................            8,363,971           9,307,851
  Other assets.........................................................           10,847,128          31,266,929
                                                                         -------------------  ------------------
    Total general account assets.......................................        6,070,910,483       6,067,684,842
SEPARATE ACCOUNT ASSETS................................................        4,039,275,044       3,456,072,983
                                                                         -------------------  ------------------
TOTAL ASSETS...........................................................  $    10,110,185,527  $    9,523,757,825
                                                                         -------------------  ------------------
                                                                         -------------------  ------------------
 
                                            LIABILITIES AND SURPLUS
GENERAL ACCOUNT LIABILITIES
  Insurance and annuity reserves.......................................  $     4,925,407,081  $    4,929,073,256
  Other contract liabilities and reserves..............................           12,086,713          11,303,835
  Dividends payable to contract and policyholders......................               93,791             106,329
  Note payable (Note 5)................................................          137,021,175         137,021,175
  Interest maintenance reserve.........................................          213,674,120         253,944,200
  Other liabilities....................................................           69,310,429          95,801,345
                                                                         -------------------  ------------------
    Total general account liabilities..................................        5,357,593,309       5,427,250,140
SEPARATE ACCOUNT RESERVES AND OTHER LIABILITIES........................        4,039,275,044       3,456,072,983
                                                                         -------------------  ------------------
    Total liabilities..................................................        9,396,868,353       8,883,323,123
                                                                         -------------------  ------------------
ASSET VALUATION RESERVE................................................          118,485,383         116,494,396
                                                                         -------------------  ------------------
SURPLUS
  Assigned surplus.....................................................            1,150,000           1,150,000
  Unassigned surplus...................................................          593,681,791         522,790,306
                                                                         -------------------  ------------------
    Total surplus......................................................          594,831,791         523,940,306
                                                                         -------------------  ------------------
TOTAL LIABILITIES AND SURPLUS..........................................  $    10,110,185,527  $    9,523,757,825
                                                                         -------------------  ------------------
                                                                         -------------------  ------------------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                     - 25 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
               CONSOLIDATED STATEMENTS OF OPERATIONS AND SURPLUS
 
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
 
<TABLE>
<CAPTION>
                                                                                  1998                1997
                                                                           ------------------  ------------------
<S>                                                                        <C>                 <C>
INCOME
  Annuity considerations and deposits....................................  $      824,131,791  $      740,959,658
  Life and disability insurance premiums.................................          27,318,300          28,214,541
                                                                           ------------------  ------------------
    Total considerations and premiums....................................         851,450,091         769,174,199
  Separate account investment and administration fees....................          43,186,358          35,376,990
  Net investment income (Notes 2 and 3)..................................         414,565,840         441,059,670
  Other, net.............................................................          (1,966,715)           (336,265)
                                                                           ------------------  ------------------
    Total income.........................................................       1,307,235,574       1,245,274,594
                                                                           ------------------  ------------------
DEDUCTIONS
  Increase in insurance and annuity reserves.............................          81,812,257          41,301,697
  Annuity and surrender benefits.........................................         999,743,408         973,365,824
  Death and disability benefits..........................................          20,153,378          20,161,949
  Operating expenses.....................................................         151,448,387         147,172,396
                                                                           ------------------  ------------------
    Total deductions.....................................................       1,253,157,430       1,182,001,866
                                                                           ------------------  ------------------
    Net gain before dividends............................................          54,078,144          63,272,728
DIVIDENDS TO CONTRACT AND POLICYHOLDERS..................................             117,182             147,104
                                                                           ------------------  ------------------
    Net gain from operations.............................................          53,960,962          63,125,624
FEDERAL INCOME TAX BENEFIT...............................................           1,150,189             367,818
NET REALIZED CAPITAL GAINS (Note 2)......................................          16,642,540          10,778,415
                                                                           ------------------  ------------------
    Net income...........................................................          71,753,691          74,271,857
SURPLUS TRANSACTIONS
  Change in asset valuation reserve......................................          (1,990,987)         (8,818,100)
  Change in net unrealized capital gains.................................           7,239,633          32,160,963
  Change in non-admitted assets and other, net...........................          (6,110,852)         (4,719,810)
                                                                           ------------------  ------------------
    Net change in surplus................................................          70,891,485          92,894,910
SURPLUS, AT BEGINNING OF YEAR............................................         523,940,306         431,045,396
                                                                           ------------------  ------------------
SURPLUS, AT END OF YEAR..................................................  $      594,831,791  $      523,940,306
                                                                           ------------------  ------------------
                                                                           ------------------  ------------------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                     - 26 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
 
<TABLE>
<CAPTION>
                                                                                1998                1997
                                                                         ------------------  -------------------
<S>                                                                      <C>                 <C>
CASH PROVIDED
  Premium and annuity funds received...................................  $      851,727,947  $       769,846,793
  Investment income received...........................................         338,956,078          437,472,096
  Separate account investment and administrative fees..................          43,186,358           35,376,990
  Other, net...........................................................           1,739,776           (1,619,142)
                                                                         ------------------  -------------------
    Total receipts.....................................................       1,235,610,159        1,241,076,737
                                                                         ------------------  -------------------
  Benefits paid........................................................       1,019,758,402          989,719,884
  Dividends paid to contract and policyholders.........................             129,722              147,127
  Insurance and operating expenses paid................................         155,490,995          146,405,004
  Net transfers to separate accounts...................................          84,395,589          286,778,743
                                                                         ------------------  -------------------
    Total payments.....................................................       1,259,774,708        1,423,050,758
                                                                         ------------------  -------------------
    Net cash used by operations........................................         (24,164,549)        (181,974,021)
  Proceeds from long-term investments sold, matured or repaid..........       4,672,189,185       10,907,067,504
  Proceeds from dollar roll transactions--repurchase agreements........                  --          700,714,763
  Other, net...........................................................          47,407,939           44,741,139
                                                                         ------------------  -------------------
    Total cash provided................................................       4,695,432,575       11,470,549,385
                                                                         ------------------  -------------------
CASH APPLIED
  Cost of long-term investments acquired...............................       4,606,240,005       10,730,606,933
  Repayment of dollar roll transactions--repurchase agreements.........                  --          700,714,763
  Other, net...........................................................          57,671,026           32,548,605
                                                                         ------------------  -------------------
    Total cash applied.................................................       4,663,911,031       11,463,870,301
                                                                         ------------------  -------------------
    Net change in cash and short-term investments......................          31,521,544            6,679,084
CASH AND SHORT-TERM INVESTMENTS
  Beginning of year....................................................          67,164,422           60,485,338
                                                                         ------------------  -------------------
  End of year..........................................................  $       98,685,966  $        67,164,422
                                                                         ------------------  -------------------
                                                                         ------------------  -------------------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                     - 27 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
                           DECEMBER 31, 1998 AND 1997
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
PRINCIPLES OF CONSOLIDATION
 
The accompanying financial statements include the consolidated accounts of
Mutual of America Life Insurance Company ("Mutual of America") and its wholly
owned subsidiaries (collectively referred to as the "Company"). Significant
intercompany balances and transactions have been eliminated in consolidation.
 
NATURE OF OPERATIONS
 
Mutual of America provides retirement and employee benefit plans in the small to
medium size case area, principally to employees in the not-for-profit social
health and welfare field. In recent years, through a wholly owned subsidiary,
the Company has expanded the scope of the field it serves to include for-profit
organizations in the small to medium size case area. The principal insurance
companies in the group are licensed in all fifty states and the District of
Columbia. Operations are conducted primarily through a network of regional field
offices staffed by salaried consultants.
 
BASIS OF PRESENTATION
 
The financial statements are presented in conformity with statutory accounting
practices prescribed or permitted by the State of New York Insurance Department,
which practices differ from generally accepted accounting principles ("GAAP").
The variances between such practices and GAAP and the effects on the
accompanying financial statements are described in Note 9. The ability of the
Company to fulfill its obligations to contractholders and policyholders is of
primary concern to insurance regulatory authorities. As such, the financial
statements are oriented to the insuring public.
 
The preparation of financial statements requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
the disclosure of contingent 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 these estimates.
 
Certain 1997 amounts included in the accompanying consolidated financial
statements have been reclassified to conform with the 1998 presentation.
 
Accounting policies applied in the preparation and presentation of these
financial statements follow.
 
ASSET VALUATIONS
 
Investment valuations are prescribed by the National Association of Insurance
Commissioners ("NAIC"). Bonds qualifying for amortization are stated at
amortized cost; short-term investments in good standing are stated at cost. Fair
value for these securities (approximately $5.0 billion in 1998 and $4.9 billion
in 1997) is determined by reference to market prices quoted
 
                                     - 28 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
by the NAIC. If quoted market prices are not available, fair value is determined
using quoted prices for similar securities. All other bonds and short-term notes
are stated at market value which approximates fair value.
 
Common stocks in good standing are stated at market value, which approximates
fair value. Market value is determined by reference to valuations quoted by the
NAIC. Unrealized gains and losses are applied directly to unassigned surplus.
 
Mortgage loans are carried at amortized indebtedness. Fair value for these loans
(approximately $19.6 million in 1998 and $46.8 million in 1997) is determined by
discounting the expected future cash flows using the current rate at which
similar loans would be made to borrowers with similar credit ratings and
remaining maturities. Impairments of individual assets that are considered other
than temporary are recognized when incurred. There were no impairments recorded
during 1998 or 1997.
 
Real estate, which is classified as Company occupied property, is carried at
cost, including capital improvements, net of accumulated depreciation, and
depreciated on a straight line basis over 39 years. Tenant improvements on real
estate investments are depreciated over the shorter of the lease term or the
estimated life of the improvement.
 
Policy loans are stated at the unpaid balance of the loan. The majority of such
loans are issued with variable interest rates which are periodically adjusted
based on changes in the rates credited to these policies and therefore are
considered to be stated at fair value.
 
Certain other assets, such as furniture and fixtures and prepaid expenses, are
excluded from the consolidated statements of financial condition ("non-admitted
assets").
 
INTEREST MAINTENANCE AND ASSET VALUATION RESERVES
 
Realized gains and losses, net of applicable taxes, arising from changes in
interest rates are accumulated in the Interest Maintenance Reserve ("IMR") and
are amortized into net investment income over the estimated remaining life of
the investment sold. All other realized gains and losses are reported in the
consolidated statements of operations and surplus.
 
An Asset Valuation Reserve ("AVR") applying to the specific risk characteristics
of all invested asset categories excluding cash, policy loans and investment
income accrued has been established based on a statutory formula. Realized and
unrealized gains and losses arising from changes in the creditworthiness of the
borrower are included in the appropriate subcomponent of the AVR. Changes in the
AVR are applied directly to unassigned surplus.
 
GUARANTEED FUNDS TRANSFERABLE
 
Guaranteed funds transferable consist of funds held by a former reinsurer and
are stated at the total principal amount of future guaranteed transfers to
Mutual of America, which approximates fair value.
 
                                     - 29 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
SEPARATE ACCOUNT OPERATIONS
 
Certain annuity considerations may be invested at the participant's discretion
in separate accounts; either a multifund account, which is managed by Mutual of
America Capital Management Corporation, or certain other funds, which are
managed by outside investment advisors. All of the funds' investment experience,
including net realized and unrealized capital gains in the separate accounts
(net of investment advisory fees and administration fees assessed), is allocated
to participants. Charges for investment advisory fees and administration fees
are assessed as a percentage of the assets under management and vary based upon
the investment objectives of the fund and level of administrative services
provided. During 1998 and 1997 such fees were equal to approximately 1.10% of
the total average assets under management.
 
Investments held in the separate accounts are stated at market value, which
approximates fair value. Participants' corresponding equity in the separate
accounts are reported as liabilities in the accompanying statements. Premiums
and benefits related to the separate accounts are combined with the general
account in the accompanying statements. Net operating gains are offset by
increases to reserve liabilities in the respective separate accounts.
 
INSURANCE AND ANNUITY RESERVES
 
Reserves for annuity contracts are computed on the net single premium method and
represent the estimated present value of future retirement benefits. These
reserves are based on mortality and interest rate assumptions (ranging
predominately from 5.00% to 9.25%) which meet or exceed statutory requirements.
Reserves for contractual funds not yet used for the purchase of annuities are
accumulated at various interest rates which, during 1998 and 1997, averaged
5.00% and 5.50%, respectively and are deemed sufficient to provide for
contractual surrender values of these funds. Reserves for life and disability
insurance are based on mortality, morbidity and interest rate assumptions which
meet statutory requirements.
 
Contractual funds not yet used to purchase retirement annuities and other
deposit liabilities are stated at their cash surrender value, which approximates
fair value ($7.6 billion and $7.0 billion), at December 31, 1998 and 1997,
respectively. The fair value of annuity contracts (approximately $1.6 billion
and $1.5 billion at December 31, 1998 and 1997, respectively) was determined by
discounting expected future retirement benefits using current mortality tables
and interest rates based on the duration of expected future benefits. Weighted
average interest rates of 5.38% and 6.12% were used at December 31, 1998 and
1997, respectively.
 
PREMIUMS, ANNUITY CONSIDERATIONS, INVESTMENT INCOME AND EXPENSES
 
Insurance premiums and annuity considerations derived from defined contribution
plans are recognized as income when due. Voluntary savings-type and defined
benefit considerations and other deposits are recognized as income when
received. Group life and disability insurance premiums are recognized as income
over the contract period.
 
                                     - 30 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
General account investment income is reported as earned and is presented net of
related investment expenses; operating expenses, including acquisition costs for
new business and income taxes, are charged to operations as incurred.
 
DIVIDENDS
 
Dividends are based on formulas and scales approved by the Board of Directors
and are accrued currently for payment subsequent to plan anniversary dates.
 
2. FIXED MATURITY AND EQUITY SECURITIES
 
The statement values and NAIC market values of investments in fixed maturity
securities (bonds and notes) at December 31, 1998 are shown below. Excluding
U.S. government and government agency investments, the Company is not exposed to
any significant concentration of credit risk.
 
<TABLE>
<CAPTION>
                                                                              GROSS        GROSS
                                                              STATEMENT    UNREALIZED   UNREALIZED       NAIC
CATEGORY                                                        VALUE         GAINS       LOSSES     MARKET VALUE
- ----------------------------------------------------------  -------------  -----------  -----------  -------------
                                                                               (000'S OMITTED)
<S>                                                         <C>            <C>          <C>          <C>
U.S. Treasury securities and obligations of U.S.
  Government corporations and agencies....................  $   2,030,666   $  15,527    $   1,071   $   2,045,122
Obligations of states and political subdivisions..........         10,727       2,086           --          12,813
Debt securities issued by foreign governments.............        106,243       6,112           --         112,355
Corporate securities......................................      2,834,819      50,542       33,067       2,852,294
                                                            -------------  -----------  -----------  -------------
    Total.................................................  $   4,982,455   $  74,267    $  34,138   $   5,022,584
                                                            -------------  -----------  -----------  -------------
                                                            -------------  -----------  -----------  -------------
</TABLE>
 
Short-term fixed maturity securities with a statement value and NAIC market
value of $108.2 million at December 31, 1998 are included in the above table. As
of December 31, 1998, the Company had $6.2 million (par value $6.0 million) of
its long-term fixed maturity securities on deposit with various state regulatory
agencies.
 
The statement values and NAIC market values of investments in fixed maturity
securities by contractual maturity (except for mortgage-backed securities which
are stated at expected maturity) at December 31, 1998 are shown below. Expected
maturities may differ from
 
                                     - 31 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
2. FIXED MATURITY AND EQUITY SECURITIES (CONTINUED)
contractual maturities because borrowers may have the right to prepay
obligations with or without prepayment penalties.
 
<TABLE>
<CAPTION>
                                                                STATEMENT        NAIC
                                                                  VALUE      MARKET VALUE
                                                              -------------  -------------
                                                                    (000'S OMITTED)
<S>                                                           <C>            <C>
Due in one year or less.....................................  $     261,253  $     263,498
Due after one year through five years.......................      1,553,255      1,567,426
Due after five years through ten years......................      1,417,466      1,498,422
Due after ten years.........................................      1,750,481      1,693,238
                                                              -------------  -------------
    Total...................................................  $   4,982,455  $   5,022,584
                                                              -------------  -------------
                                                              -------------  -------------
</TABLE>
 
Proceeds from the sale of investments in fixed maturity securities during 1998
were $4.2 billion. Gross gains of $20.0 million and gross losses of $6.0 million
were realized on these sales, of which $14.0 million of gains were accumulated
in the IMR. Such amounts will be amortized into net investment income over the
estimated remaining life of the investment sold.
 
During 1998, $54.2 million of the IMR was amortized and included in net
investment income. Included in IMR amortization income for the year is a $34.5
million net adjustment related to realized capital gains that should have been
exempted from IMR since they were associated with higher than normal general
account withdrawal activity (including transfers to the Separate Account) that
occurred last year.
 
The statement values and NAIC market values of investments in fixed maturity
securities at December 31, 1997 are as follows:
 
<TABLE>
<CAPTION>
                                                                              GROSS        GROSS
                                                              STATEMENT    UNREALIZED   UNREALIZED       NAIC
CATEGORY                                                        VALUE         GAINS       LOSSES     MARKET VALUE
- ----------------------------------------------------------  -------------  -----------  -----------  -------------
                                                                               (000'S OMITTED)
<S>                                                         <C>            <C>          <C>          <C>
U.S. Treasury securities and obligations of U.S.
  Government corporations and agencies....................  $   2,414,115   $   7,846    $     412   $   2,421,549
Obligations of states and political subdivisions..........         13,421       1,704           --          15,125
Debt securities issued by foreign governments.............        101,186       4,624           28         105,782
Corporate securities......................................      2,329,186      25,640        9,123       2,345,703
                                                            -------------  -----------  -----------  -------------
    Total.................................................  $   4,857,908   $  39,814    $   9,563   $   4,888,159
                                                            -------------  -----------  -----------  -------------
                                                            -------------  -----------  -----------  -------------
</TABLE>
 
Short-term fixed maturity securities with a statement value and NAIC market
value of $62.9 million at December 31, 1997, are included in the above table. As
of December 31, 1997, the Company had $6.2 million (par value $6.0 million) of
its long-term fixed maturity securities on deposit with various state regulatory
agencies.
 
                                     - 32 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
2. FIXED MATURITY AND EQUITY SECURITIES (CONTINUED)
Proceeds from the sale of investments in fixed maturity securities during 1997
were $11.1 billion. Gross gains of $145.1 million and gross losses of $16.0
million were realized on those sales, of which $126.4 million of gains were
accumulated (net of applicable tax benefits of $2.7 million) in the IMR. Such
amounts will be amortized into net investment income over the estimated
remaining life of the investment sold. During 1997, $18.0 million of the IMR was
amortized and included in net investment income.
 
Net realized capital gains (losses) reflected in the statements of operations
for the years ended December 31, 1998 and 1997 were as follows:
 
<TABLE>
<CAPTION>
                                                                       1998       1997
                                                                     ---------  ---------
                                                                       (000'S OMITTED)
<S>                                                                  <C>        <C>
Equity securities (common and preferred stocks)....................  $  16,010  $  19,606
Mortgage loans and other...........................................        633     (8,828)
                                                                     ---------  ---------
    Net realized capital gains.....................................  $  16,643  $  10,778
                                                                     ---------  ---------
                                                                     ---------  ---------
</TABLE>
 
At December 31, 1998 and 1997, net unrealized appreciation of common equity
securities was $51.3 million and $44.1 million, respectively.
 
3. REINSURANCE AND RELATED TRANSACTIONS
 
In 1980, Mutual of America terminated a reinsurance arrangement and assumed
direct ownership of funds held by the reinsurer and direct liability for the
contractual obligations of the reinsurer. Such amounts are reported as
guaranteed funds transferable and as insurance and annuity reserves in the
consolidated statements of financial condition.
 
The guaranteed funds are transferable to Mutual of America over time and are
stated at the total principal amount of future guaranteed transfers to Mutual of
America of $115.9 million and $121.1 million at December 31, 1998 and 1997,
respectively.
 
The guaranteed interest and other allocated investment earnings on the funds
held by the reinsurer, amounting to $12.2 million and $33.8 million in 1998 and
1997, respectively, are included in net investment income. Such amounts include
participating dividends from a contingency fund that was previously held by the
reinsurer (but not recorded as an asset of Mutual of America) of $25.9 million
in 1997. This amount includes the receipt of a $21.5 million special dividend
related to the termination of the contingency fund previously held by the
reinsurer.
 
4. REAL ESTATE
 
Real estate consists primarily of an office building that Mutual of America
purchased for its corporate headquarters. The purchase price of the building was
fully financed. The Company occupies approximately one-third of this office
building as its corporate headquarters and leases the remaining space.
Depreciation expense for 1998 and 1997 was $5.2 million in both years.
 
                                     - 33 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
5. NOTE PAYABLE
 
In connection with the acquisition of its corporate headquarters, Mutual of
America obtained a $135.0 million, seven-year, 6.91% fixed rate secured term
note. Fair value of the note was approximately $137.0 million at December 31,
1998 and 1997. The note matures and is payable in full on October 15, 1999 and
is not redeemable prior to that date. Interest on the note is payable
semiannually in April and October. The terms of the note require that Mutual of
America pledge collateral, consisting of securities issued by the United States
Government or its agencies. The aggregate book and market values of the
collateral must be maintained at a level greater than or equal to 100% and 110%,
respectively, of the outstanding balance of the note. At December 31, securities
with a book and market value of approximately $166.7 million and $169.9 million
in 1998 and $167.9 million and $167.5 million in 1997, respectively, were
pledged as collateral.
 
6. PENSION PLAN AND POSTRETIREMENT BENEFITS
 
The Company has a qualified, non-contributory defined benefit pension plan
covering virtually all employees. Benefits are generally based on years of
service and final average salary. The Company's funding policy is to contribute
annually, at a minimum, the amount necessary to satisfy the funding requirements
under the Employee Retirement Income Security Act of 1974 ("ERISA"). The Company
also maintains two non-qualified defined benefit pension plans. The first
provides benefits to employees whose total compensation exceeds the maximum
allowable compensation limits for qualified retirement plans under ERISA. The
second provides benefits to non-employee members of the Board of Directors.
 
The Company has two defined benefit postretirement plans covering substantially
all salaried employees. Employees may become eligible for such benefits upon
attainment of retirement age while in the employ of the Company and upon
satisfaction of service requirements. One plan provides medical and dental
benefits and the second plan provides life insurance benefits. The
postretirement plans are contributory for those individuals who retire with less
than twenty years of eligible service, with retiree contributions adjusted
annually and contain other cost-sharing features, such as deductibles and
coinsurance.
 
Pension expense for all pension plans in 1998 and 1997 was $8.9 million and $5.4
million, respectively. The 1998 amount includes $2.8 million of expense related
to the lump-sum settlement of approximately $24.2 million in pension benefits
during the year. Prior to 1997, pension plan expense was computed on a modified
GAAP basis. Effective January 1, 1997 the expense and liability related to all
of the Company's pension plans and its long term incentive compensation plan
(described below) are calculated in accordance with GAAP. This change resulted
in a charge to surplus, net of the change in the prepaid pension cost, of $9.7
million at January 1, 1997.
 
                                     - 34 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
6. PENSION PLAN AND POSTRETIREMENT BENEFITS (CONTINUED)
The components of net pension expense related to all of the Company's pension
plans are as follows:
 
<TABLE>
<CAPTION>
                                                                        1998       1997
                                                                      ---------  ---------
                                                                        (000'S OMITTED)
<S>                                                                   <C>        <C>
Service cost........................................................  $   5,353  $   4,596
Interest cost on projected benefit obligation.......................      6,189      5,159
Expected return on plan assets......................................     (6,870)    (5,469)
Amortization of initial net asset...................................       (211)      (211)
Amortization of unrecognized loss...................................      1,639      1,291
Settlement loss.....................................................      2,768         --
                                                                      ---------  ---------
    Net pension expense.............................................  $   8,868  $   5,366
                                                                      ---------  ---------
                                                                      ---------  ---------
</TABLE>
 
The funded status of all of the Company's pension plans at December 31, 1998 and
1997 is as follows:
 
<TABLE>
<CAPTION>
                                                                      1998        1997
                                                                   ----------  ----------
                                                                      (000'S OMITTED)
<S>                                                                <C>         <C>
Projected benefit obligation.....................................  $  (93,544) $  (77,322)
Plan assets at fair value........................................      60,470      58,619
                                                                   ----------  ----------
Projected benefit obligation in excess of plan assets............     (33,074)    (18,703)
Remaining unrecognized initial net asset.........................        (450)       (841)
Unrecognized prior service cost..................................       4,564       5,177
Unrecognized net loss from past experience different from that
  assumed........................................................      40,079      17,546
                                                                   ----------  ----------
Prepaid pension cost, end of year................................  $   11,119  $    3,179
                                                                   ----------  ----------
                                                                   ----------  ----------
</TABLE>
 
For financial reporting purposes, the prepaid pension cost at December 31, 1998
and 1997, has been classified as a non-admitted asset. At December 31, 1998 all
of the qualified pension plan assets are invested in one of the Company's
separate accounts (consisting primarily of equity securities) and participation
in certain other funds managed by outside investment advisors.
 
The discount rate used in determining the actuarial present value of the
projected benefit obligation was 6.80% and 7.25% at December 31, 1998 and 1997,
respectively. This .45% decrease in the discount rate together with a change in
employee mortality and turnover rates resulted in a $17.3 million increase in
the projected benefit obligation (PBO) for the year. The assumed rate of
increase in future compensation levels was 4.00% in 1998 and 1997. The
 
                                     - 35 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
6. PENSION PLAN AND POSTRETIREMENT BENEFITS (CONTINUED)
assumed long-term rate of return on assets used in determining the net periodic
pension cost was 11.30% in 1998 and 1997. The change in the PBO during 1998 and
1997 is as follows:
 
<TABLE>
<CAPTION>
                                                                       1998       1997
                                                                    ----------  ---------
                                                                       (000'S OMITTED)
<S>                                                                 <C>         <C>
January 1 balance.................................................  $   77,322  $  60,351
Service cost......................................................       5,353      4,596
Interest cost.....................................................       6,189      5,159
Change in assumptions.............................................      17,298      7,850
Actuarial loss....................................................      11,775      4,326
Benefits and expenses paid........................................     (24,393)    (4,960)
                                                                    ----------  ---------
December 31 balance...............................................  $   93,544  $  77,322
                                                                    ----------  ---------
                                                                    ----------  ---------
</TABLE>
 
The Company funds the qualified non-contributory defined benefit pension plan in
accordance with the requirements of ERISA. Plan assets at fair value for the
qualified pension plan were $52.3 million and $47.4 million at December 31, 1998
and 1997, respectively. The actuarial present value of accumulated benefits for
the qualified pension plan were $32.6 million and $50.0 million at December 31,
1998 and 1997, respectively. During 1998 and 1997, the Company made
contributions to the qualified plan of $13.3 million and $4.4 million,
respectively.
 
The change in plan assets for all of the Company's pension plans is as follows:
 
<TABLE>
<CAPTION>
                                                                       1998       1997
                                                                    ----------  ---------
                                                                       (000'S OMITTED)
<S>                                                                 <C>         <C>
January 1 balance.................................................  $   58,619  $  43,718
Employer contributions............................................      16,807     12,127
Return on Plan assets.............................................       9,437      7,734
Benefits and expenses paid........................................     (24,393)    (4,960)
                                                                    ----------  ---------
December 31 balance...............................................  $   60,470  $  58,619
                                                                    ----------  ---------
                                                                    ----------  ---------
</TABLE>
 
In addition to the above noncontributory plans, all employees may participate in
a 401(k) savings plan under which the Company matches half of the employees'
basic contribution up to 6% of salary. The cost of this plan was approximately
$1.7 million and $1.6 million in 1998 and 1997, respectively. The Company also
has a long-term performance based incentive compensation plan for certain
employees. Shares are granted each year and generally vest over a three-year
period. The value of such shares is based upon increases in the Company's
statutory surplus and the maintenance of certain financial ratios. Compensation
expense recognized in 1998 and 1997 related to this plan was $3.2 million and
$3.0 million respectively.
 
                                     - 36 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
6. PENSION PLAN AND POSTRETIREMENT BENEFITS (CONTINUED)
The components of net postretirement benefit cost are as follows:
 
<TABLE>
<CAPTION>
                                                                          1998       1997
                                                                        ---------  ---------
                                                                          (000'S OMITTED)
<S>                                                                     <C>        <C>
Service cost..........................................................  $     609  $     600
Interest cost on projected benefit obligation.........................      1,272      1,175
Actuarial loss........................................................        156         --
                                                                        ---------  ---------
Net postretirement benefit cost.......................................  $   2,037  $   1,775
                                                                        ---------  ---------
                                                                        ---------  ---------
</TABLE>
 
The following table shows the plans' combined status reconciled with the amounts
reported in the Company's consolidated statements of financial condition:
 
<TABLE>
<CAPTION>
                                                                       1998       1997
                                                                     ---------  ---------
                                                                       (000'S OMITTED)
<S>                                                                  <C>        <C>
Accumulated postretirement benefit obligation ("APBO"):
  Retirees.........................................................  $   7,854  $   5,911
  Fully eligible active plan participants..........................      3,367      3,456
  Other active plan participants...................................      6,817      6,239
                                                                     ---------  ---------
      Total APBO...................................................     18,038     15,606
Plan assets at fair value..........................................         --         --
                                                                     ---------  ---------
APBO in excess of plan assets......................................     18,038     15,606
Unrecognized net loss..............................................     (5,615)    (4,920)
                                                                     ---------  ---------
Accrued postretirement obligation..................................  $  12,423  $  10,686
                                                                     ---------  ---------
                                                                     ---------  ---------
</TABLE>
 
The weighted average annual assumed rate of increase in the per capita cost of
covered benefits (i.e., health care cost trend rate) for the medical plan is
approximately 7.00% in 1998. The health care cost trend rate assumption has a
significant affect on the amounts reported. For example, increasing the assumed
health care cost trend rate by one percentage point in each year would increase
the accumulated postretirement obligation for the plan as of December 31, 1998
by $1.3 million and the aggregate of the service and interest cost components of
the net periodic benefit cost for 1998 by $.3 million.
 
The discount rate used in determining the APBO was 6.80% at December 31, 1998
and 7.25% at December 31, 1997.
 
7. COMMITMENTS AND CONTINGENCIES
 
Rental expenses were $17.3 million and $16.7 million in 1998 and 1997,
respectively. The approximate minimum rental commitments under noncancelable
operating leases are as follows: 1999, $2.8 million, 2000, $2.1 million, 2001,
$1.7 million, 2002, $1.6 million and 2003,
 
                                     - 37 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
7. COMMITMENTS AND CONTINGENCIES (CONTINUED)
$1.0 million, and 2004 and beyond, $.8 million. Such leases are principally for
leased office space, furniture and equipment. Certain office space leases
provide for adjustments to reflect changes in real estate taxes and other
operating expenses.
 
The Company is involved in various legal actions which have arisen in the course
of the Company's business. In the opinion of management, the ultimate liability
with respect to such lawsuits as well as other contingencies is not considered
to be material in relation to the Company's consolidated financial statements.
 
8. FEDERAL INCOME TAXES
 
Mutual of America's pension business was exempt from federal income taxation
under Section 501(a) of the Internal Revenue Code ("Code") in 1997. Effective
January 1, 1998 Mutual of America's pension business became subject to federal
income tax. Mutual of America and its life subsidiary file federal tax returns
on a separate company basis. Mutual of America's non-insurance subsidiaries file
a consolidated tax return. The Federal income tax benefit for the year ended
December 31, 1998 amounted to $1.2 million as compared to benefit of $.4 million
in 1997. The 1998 and 1997 tax benefits reflected in the accompanying statements
of operations and surplus arose principally from the operating results of its
insurance and non-insurance subsidiaries.
 
The difference between the actual tax benefit reflected in the accompanying
consolidated statements of operations and the expected tax provision computed by
applying the statutory rate of 35% to operating income arises principally from
the differing statutory and tax treatment of IMR income and realized capital
gains and losses on investment transactions and from the differences between the
tax and statutory basis of Mutual of America's assets and liabilities. Such
differences resulted from transition rules under the Code as of January 1, 1998,
which accompanied the change in taxation of Mutual of America's pension
business. These transition rules will moderate Mutual of America's tax expense
over the next several years.
 
9. RECONCILIATION OF STATUTORY BASIS FINANCIAL RESULTS TO A GENERALLY ACCEPTED
   ACCOUNTING PRINCIPLES BASIS
 
The accompanying financial statements are presented in conformity with statutory
accounting practices prescribed or permitted by the State of New York Insurance
Department which practices differ from GAAP. The variances between such
practices and GAAP and the effects on the accompanying financial statements
follow:
 
ASSET VALUATIONS AND INVESTMENT INCOME RECOGNITION
 
GAAP requires the Company's bonds and notes to be classified as either held to
maturity ("HTM") or available for sale ("AFS"); whereas for statutory accounting
no such classification is required. In addition, for GAAP, AFS bonds and notes
are carried at their fair market value
 
                                     - 38 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
9. RECONCILIATION OF STATUTORY BASIS FINANCIAL RESULTS TO A GENERALLY ACCEPTED
   ACCOUNTING PRINCIPLES BASIS (CONTINUED)
with the unrealized gains and losses applied directly to surplus; whereas for
statutory accounting all bonds and notes are carried at their amortized cost.
 
Realized capital gains and losses, net of applicable taxes, arising from changes
in interest rates are recognized in income currently for GAAP accounting, rather
than accumulated in the IMR and amortized into income over the remaining life of
the security sold for statutory accounting. Additionally, capital gains and
losses are not recognized when a security is sold and the same or substantially
the same security is repurchased, unless the repurchase occurs after a
reasonable exposure to market risk.
 
A general formula based Asset Valuation Reserve (AVR) is recorded for statutory
accounting purposes, whereas such reserves are established under GAAP only when
an asset's impairment is considered to be other than temporary.
 
Certain assets, principally furniture and fixtures and prepaid expenses, for
statutory accounting, are excluded from the statement of financial condition by
a charge to surplus; whereas under GAAP, such assets are carried at their
amortized cost.
 
POLICY ACQUISITION COSTS
 
Under GAAP, policy acquisition costs that are directly related to and vary with
the production of new business are deferred and amortized over the estimated
life of the applicable policies, rather than being expensed as incurred.
 
INSURANCE AND ANNUITY RESERVES
 
Under statutory accounting practices the interest rates and mortality and
morbidity assumptions used are those which are prescribed or permitted by the
State of New York Insurance Department. Under GAAP, for annuities the interest
rate assumptions used are generally those assumed in the pricing of the contract
at issue; for disability benefits the interest rates assumed are those
anticipated to be earned over the duration of the benefit period. Mortality and
morbidity assumptions are based on Company experience.
 
PREMIUM RECOGNITION
 
Insurance contracts that do not subject the insurer to significant mortality or
morbidity risk are considered, under GAAP, to be primarily investment contracts.
GAAP requires all amounts received from policyholders under these investment
contracts to be recorded as a policyholder deposit rather than as premium
income.
 
                                     - 39 -
<PAGE>
                    MUTUAL OF AMERICA LIFE INSURANCE COMPANY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                           DECEMBER 31, 1998 AND 1997
 
9. RECONCILIATION OF STATUTORY BASIS FINANCIAL RESULTS TO A GENERALLY ACCEPTED
   ACCOUNTING PRINCIPLES BASIS (CONTINUED)
DEFERRED INCOME TAXES
 
GAAP requires that a deferred tax asset or liability be established to provide
for temporary differences between the tax and financial reporting bases of
assets and liabilities. Deferred income taxes are not recorded for statutory
accounting purposes.
 
The tables that follow provide a reconciliation of the 1998 and 1997 statutory
financial results reflected in the accompanying financial statements to a GAAP
basis (000's omitted):
 
<TABLE>
<CAPTION>
RECONCILIATION OF STATUTORY TO GAAP SURPLUS                         1998          1997
- --------------------------------------------------------------  -------------  -----------
<S>                                                             <C>            <C>
STATUTORY SURPLUS.............................................  $     594,832  $   523,940
  Market value adjustment related to AFS bonds and notes......        170,821      160,980
  Realized capital gains......................................        136,019      163,422
  AVR.........................................................        118,485      116,494
  Deferred policy acquisition costs...........................         39,761       36,905
  Policy reserve adjustments..................................        (21,815)     (17,510)
  Non-admitted assets.........................................         16,196        9,563
  Federal income taxes........................................        163,130      (20,571)
  Other.......................................................          1,663        1,135
                                                                -------------  -----------
GAAP SURPLUS..................................................  $   1,219,092  $   974,358
                                                                -------------  -----------
                                                                -------------  -----------
</TABLE>
 
<TABLE>
<CAPTION>
RECONCILIATION OF STATUTORY TO GAAP NET INCOME                       1998         1997
- ----------------------------------------------------------------  -----------  -----------
<S>                                                               <C>          <C>
STATUTORY NET INCOME............................................  $    71,754  $    74,272
  Investment income adjustments.................................      (52,750)      (8,020)
  Realized capital gains........................................       25,342      145,791
  Policy reserve adjustments....................................       (3,463)       3,781
  Deferred acquisition costs....................................        5,969        2,518
  Deferred income taxes.........................................      237,051       (6,559)
  Dividend related to termination of contingency fund (Note
    3)..........................................................           --      (20,920)
  Other.........................................................       (1,488)      (4,485)
                                                                  -----------  -----------
GAAP NET INCOME.................................................  $   282,415  $   186,378
                                                                  -----------  -----------
                                                                  -----------  -----------
</TABLE>
 
<TABLE>
<CAPTION>
RECONCILIATION OF GAAP TO STATUTORY PREMIUMS                         1998         1997
- ----------------------------------------------------------------  -----------  -----------
<S>                                                               <C>          <C>
GAAP PREMIUM INCOME.............................................  $    61,073  $   104,129
  Premiums from investment contracts............................      790,377      665,045
                                                                  -----------  -----------
STATUTORY PREMIUM INCOME........................................  $   851,450  $   769,174
                                                                  -----------  -----------
                                                                  -----------  -----------
</TABLE>
 
                                     - 40 -


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