MINNESOTA MUTUALS VARIABLE FUND D
497, 1997-05-02
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<PAGE>
VARIABLE FUND D PROSPECTUS
GROUP AND INDIVIDUAL VARIABLE ANNUITY CONTRACT
OF MINNESOTA MUTUAL'S VARIABLE FUND D
 
THE  VARIABLE  ANNUITY  CONTRACTS,  WHICH  ARE  MORE  FULLY  DESCRIBED  IN  THIS
PROSPECTUS, ARE DESIGNED TO PROVIDE  BENEFITS UNDER CERTAIN RETIREMENT  PROGRAMS
OR PLANS WHICH QUALIFY FOR SPECIAL FEDERAL INCOME TAX TREATMENT.
  The  owner of a contract or a participant  under a group contract may elect to
have contract values accumulated on a completely variable basis, on a completely
fixed basis (as  part of  Minnesota Mutual's General  Account and  in which  the
safety  of principal and interest are guaranteed)  or on a combination fixed and
variable basis. To the extent that contract values are accumulated on a variable
basis, they will be a part of the  Variable Fund D. The Variable Fund D  invests
its  assets in  shares of  Advantus Series Fund,  Inc. (the  "Series Fund"). The
variable accumulation value  of the  contract and  the amount  of each  variable
annuity payment will vary in accordance with the performance of the Portfolio or
Portfolios of the Series Fund selected by the contract owner or participant. The
contract  owner or participant bears the  entire investment risk for any amounts
allocated to the Portfolios of the Series Fund.
  This Prospectus sets forth information that a prospective investor should know
before investing in  the Variable Fund  D, and it  should be read  and kept  for
future  reference. A Statement of Additional Information, bearing the same date,
which contains further contract and Variable Fund D information, has been  filed
with  the Securities  and Exchange Commission  and is  incorporated by reference
into this Prospectus. A copy of  the Statement of Additional Information may  be
obtained  without charge by  calling (612) 665-3500, or  by writing the Variable
Fund D  at its  principal office  at Minnesota  Mutual Life  Center, 400  Robert
Street  North,  St. Paul,  Minnesota  55101-2098. A  Table  of Contents  for the
Statement of Additional Information appears in this Prospectus on page 29.
 
This Prospectus is not valid unless attached to a current prospectus of Advantus
Series Fund, Inc.
 
THESE SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES  AND
EXCHANGE COMMISSION, NOR HAS THE COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
THIS PROSPECTUS SHOULD BE READ CAREFULLY AND RETAINED FOR FUTURE REFERENCE.
 
   [LOGO]
The Minnesota Mutual Life Insurance Company
400 Robert Street North
St. Paul, MN 55101-2098
(612) 665-3500
http://www.minnesotamutual.com
 
The date of this document and the Statement of Additional Information is: May 1,
1997.
 
F.16106 Rev. 5-1997
<PAGE>
- ------------------------------------------------------------------------
DEFINITIONS
 
As used in this Prospectus, the following terms have the indicated meanings:
 
ACCUMULATION  UNIT:  an  accounting device  used  to  determine the  value  of a
contract before annuity payments begin.
 
ACCUMULATION VALUE:  the sum  of the  values  under a  contract in  the  General
Account and in the Variable Fund D.
 
ANNUITY:  a  series of  payments for  life; for  life with  a minimum  number of
payments guaranteed; for the joint lifetime of the annuitant and another  person
and thereafter during the lifetime of the survivor; or for a period certain.
 
ANNUITY  UNIT:  an accounting  device used  to determine  the amount  of annuity
payments.
 
CODE: the Internal Revenue Code of 1986, as amended.
 
CONTRACT OWNER: the owner of the contract, which could be the annuitant, his  or
her employer, or a trustee acting on behalf of the employer.
 
CONTRACT  YEAR:  a period  of one  year beginning  with the  contract date  or a
contract anniversary.
 
FIXED  ANNUITY:  an  annuity  providing  for  payments  of  guaranteed   amounts
throughout the payment period.
 
FUND:  the mutual fund  or separate investment portfolio  within a series mutual
fund which has been designated as  an eligible investment for the Variable  Fund
D, namely, Advantus Series Fund, Inc. and its Portfolios.
 
GENERAL ACCOUNT: all of our assets other than those in the Variable Fund D or in
other separate accounts established by us.
 
PARTICIPANT:  a person for whom an interest  is maintained under a group annuity
contract, prior to the time that annuity payments begin.
 
PLAN: a tax-qualified employer pension, profit-sharing, or annuity purchase plan
under which  benefits are  to  be provided  by  the variable  annuity  contracts
described herein.
 
PURCHASE PAYMENTS: amounts paid to us under a contract.
 
VALUATION DATE: each date on which a Fund Portfolio is valued.
 
VARIABLE  ANNUITY:  an  annuity  providing for  payments  varying  in  amount in
accordance with the investment experience of the Variable Fund D.
 
VARIABLE FUND  D: a  separate  investment account  called the  Minnesota  Mutual
Variable  Fund D, where the investment experience of its assets is kept separate
from our other assets. This separate account has several sub-accounts.
 
2
<PAGE>
  SYNOPSIS  CONTAINS A BRIEF  SUMMARY OF SOME  OF THE IMPORTANT  FEATURES OF THE
VARIABLE ANNUITY CONTRACTS DESCRIBED  IN THIS PROSPECTUS.  THE SUMMARY DOES  NOT
PROVIDE  A FULL  DESCRIPTION OF  THE CONTRACTS,  WHICH IS  PROVIDED ONLY  IN THE
PROSPECTUS. YOU MAY FIND  IT HELPFUL TO RE-READ  THIS SUMMARY AFTER READING  THE
PROSPECTUS, WHICH SHOULD BE RETAINED FOR FUTURE REFERENCE. A GLOSSARY OF SPECIAL
TERMS USED IN THIS PROSPECTUS MAY BE FOUND ON THE PRECEDING PAGE.
  This Prospectus describes variable annuity contracts which are offered for use
in  connection with  certain retirement  plans or  programs entitled  to special
federal income  tax benefits.  These  plans or  programs include:  (a)  employer
pension  or profit-sharing plans qualified under Section 401(a) or 403(a) of the
Internal Revenue Code  (the "Code");  (b) pension plans  established by  persons
entitled  to the benefits of the Self-Employed Individuals Tax Retirement Act of
1962, as amended (H.R. 10 or Keogh plans); (c) annuity purchase plans adopted by
public school systems and certain  tax exempt organizations pursuant to  Section
403(b)  of  the  Code;  (d)  individual  retirement  annuity  plans  adopted  by
individuals pursuant to Section 408 of the Code; and (e) eligible state deferred
compensation plans described in Section 457 of the Code.
  Three  types  of   variable  annuity  contracts   are  offered  by   Minnesota
Mutual--Individual  Accumulation Annuity, Group  Accumulation Annuity, and Group
Deposit Administration. The minimum purchase payment for the first contract year
under a Group Deposit  Administration Contract is  $3,000. The minimum  periodic
purchase  payment under  an Individual Accumulation  Annuity Contract  and as to
each participant under a Group Accumulation Annuity Contract is $10.  Currently,
Minnesota  Mutual is waiving  the enforcement of this  provision. For a detailed
description of each type of contract, see "Description of the Contracts" on page
15.
  For contracts used  as individual  retirement annuities  there is  a right  of
revocation  after the contract is established. See "Right of Revocation" on page
15.
  The contracts are combined fixed and variable annuity contracts which  provide
for  monthly annuity payments.  These payments may begin  immediately or at some
future date. Purchase payments received under a contract are allocated either to
our General Account  or to  Variable Fund D.  In the  General Account,  purchase
payments receive interest and principal guarantees; in the Variable Fund D, your
purchase  payments are  invested in  one or  more Portfolios  of Advantus Series
Fund, Inc. and receive no interest or principal guarantees.
  To the extent amounts are invested in the sub-accounts of the Variable Fund D,
the value of the contract before the date annuity payments begin, and the amount
of monthly variable annuity benefits payable  after that date, will increase  or
decrease  depending  on  increases  or  decreases in  the  market  value  of the
securities held by the Portfolios of the Series Fund.
  This Prospectus describes only the  variable aspects of the contracts,  except
where  fixed aspects are specifically mentioned.  Please look to the language of
the contracts for a description of the fixed portion of the contracts. For  more
information  on the contracts, see the heading "Description of the Contracts" in
this Prospectus.
  Currently, purchase payments  allocated to  the Variable Fund  D are  invested
exclusively  in shares of Advantus Series Fund, Inc. The Series Fund is a mutual
fund of the series  type, which means that  it has several different  portfolios
which it offers for investment. Shares of the Series Fund will be made available
at  net  asset  value  to the  Variable  Fund  D to  fund  the  variable annuity
contracts. The Series Fund is  also required to redeem  its shares at net  asset
value  at our  request. We  reserve the  right to  add, combine  or remove other
eligible funds. The investment objectives and certain policies of the Portfolios
of the Series Fund are as follows:
      The Growth Portfolio seeks the long-term accumulation of capital.  Current
    income, while a factor in portfolio selection, is a secondary objective. The
    Growth  Portfolio will  invest primarily in  common stocks  and other equity
    securities. Common stocks are more volatile than debt securities and involve
    greater investment risk.
      The Bond Portfolio seeks as high a level of long-term total rate of return
    as is consistent with prudent investment  risk. A secondary objective is  to
    seek  preservation of capital.  The Bond Portfolio  will invest primarily in
    long-term, fixed-income, high-quality  debt instruments. The  value of  debt
    securities will tend to rise
 
                                                                               3
<PAGE>
    and fall inversely with the rise and fall of interest rates.
      The  Money Market  Portfolio seeks  maximum current  income to  the extent
    consistent with liquidity  and the  stability of capital.  The Money  Market
    Portfolio  will invest in money market instruments and other debt securities
    with maturities  not  exceeding  one  year. The  return  produced  by  these
    securities will reflect fluctuation in short-term interest rates.
      AN  INVESTMENT  IN  THE  MONEY MARKET  PORTFOLIO  IS  NEITHER  INSURED NOR
    GUARANTEED BY THE  U.S. GOVERNMENT AND  THERE CAN BE  NO ASSURANCE THAT  THE
    PORTFOLIO  WILL BE ABLE  TO MAINTAIN A  STABLE NET ASSET  VALUE OF $1.00 PER
    SHARE.
      The Asset Allocation Portfolio  seeks as high a  level of long-term  total
    rate  of return  as is  consistent with  prudent investment  risk. The Asset
    Allocation  Portfolio  will  invest  in  common  stocks  and  other   equity
    securities,  bonds  and  money  market  instruments.  The  Asset  Allocation
    Portfolio involves  the risks  inherent  in stocks  and debt  securities  of
    varying  maturities and the risk  that the Portfolio may  invest too much or
    too little of its assets in each type of security at any particular time.
      The Mortgage Securities  Portfolio seeks  a high level  of current  income
    consistent  with prudent investment risk. In  pursuit of this objective, the
    Mortgage Securities Portfolio will follow  a policy of investment  primarily
    in  mortgage-related securities. Prices  of mortgage-related securities will
    tend to rise and fall inversely with the rise and fall of the general  level
    of interest rates.
      The Index 500 Portfolio seeks investment results that correspond generally
    to  the price  and yield  performance of the  common stocks  included in the
    Standard & Poor's Corporation 500 Composite Stock Price Index (the "Index").
    It is designed to provide an economical and convenient means of  maintaining
    a  broad position  in the  equity market  as part  of an  overall investment
    strategy. All common stocks, including  those in the Index, involve  greater
    investment  risk  than  debt securities.  The  fact  that a  stock  has been
    included in the Index affords no assurance against declines in the price  or
    yield performance of that stock.
      The  Small Company Portfolio  seeks long-term accumulation  of capital. In
    pursuit of this objective, the Small Company Portfolio will follow a  policy
    of investing primarily in common preferred stocks issued by small companies,
    defined  in  terms  of  either  market  capitalization  or  gross  revenues.
    Investments in small companies usually involve greater investment risks than
    fixed income  securities or  corporate  equity securities  generally.  Small
    companies  will typically  have a  market capitalization  of less  than $1.5
    billion or annual gross revenues of less than $1.5 billion.
  There is no assurance that any Portfolio will meet its objectives.  Additional
information  concerning the investment objectives and policies of the Portfolios
can be found in the current prospectus for the Series Fund, which is attached to
this Prospectus.
  Subject to the  limitations of the  type of retirement  program or a  specific
plan,  the contracts may be surrendered in whole or in part at any time prior to
the time  that annuity  payments  begin for  their  accumulation value,  less  a
deferred  sales charge, if any. See  the discussion on withdrawals and surrender
on page 23. A surrender or a withdrawal may result in adverse tax  consequences.
Once  an annuity option has  been selected and payments  begin, payments will be
made only in accordance with the terms of that option. These options, along with
a description  of the  method used  to  determine the  amount of  each  variable
annuity payment, are found on page 18.
  The  allocation of  future purchase payments  may be made  by giving Minnesota
Mutual written  or  telephone  notice.  And before  annuity  payments  begin,  a
contract   owner  or  participant  may  transfer  all  or  a  part  of  existing
accumulation values  between the  General Account  and the  separate account  or
among  the  sub-accounts of  Variable Fund  D.  These transfers  may be  made by
written request to  Minnesota Mutual and,  generally, must be  in amounts of  at
least  $250.  Currently, Minnesota  Mutual is  waiving  the enforcement  of this
provision. For additional  information on  transfers please see  the section  on
page 21.
  A  sales charge  of up  to 7% of  the payment  received is  deducted from each
purchase payment. A deduction  may also be made  from each purchase payment  for
any  applicable premium  taxes (currently  such premium  taxes range  from 0% to
3.50%, depending upon the
 
4
<PAGE>
applicable law  and are  deducted  as of  the  annuity commencement  date).  The
maximum  sales charge of 7% (exclusive of any applicable premium taxes) is 7.53%
of the amount initially invested.
  A deduction at  the rate  of .795% per  year is  made from the  value of  each
sub-account  of  Variable  Fund  D.  This deduction  is  for  the  assumption by
Minnesota Mutual of mortality and  expense risks. For additional information  on
this deduction, see page 13.
  In  addition, Advantus Capital Management, Inc.,  a subsidiary of MIMLIC Asset
Management Company,  which is  a subsidiary  of Minnesota  Mutual, acts  as  the
investment  adviser to the Series  Fund and deducts from  the net asset value of
each Portfolio of  the Series Fund  a fee  for its services  which are  provided
under  an  investment  advisory  agreement.  To  the  extent  that  the  cost of
investment advisory services in the Series Fund exceeds .265%, Minnesota  Mutual
will  make a reimbursement to Variable Fund D contracts. For more information on
this reimbursement, please see the section in this Prospectus entitled "Contract
Deductions."
  Each Portfolio of the Series Fund  is subject to certain expenses in  addition
to its advisory fee. For funds allocated to the Growth Sub-Account, a portion of
these  expenses  may  be reimbursed.  For  more  information on  this,  see this
Prospectus under the heading "Contract Deductions." For more information on  the
Series  Fund, see the prospectus of Advantus Series Fund, Inc. which is attached
to this Prospectus.
  MIMLIC Sales Corporation  ("MIMLIC Sales") acts  as the principal  underwriter
for the Variable Fund D. This firm is also affiliated with Minnesota Mutual.
 
- ------------------------------------------------------------------------
EXPENSE TABLE
The following contract expense information is intended to illustrate the expense
of  a Variable Fund D variable annuity  contract. All expenses shown are rounded
to the  nearest  dollar.  The  information  contained  in  the  tables  must  be
considered with the narrative information which immediately follows them in this
heading.
 
INDIVIDUAL ACCUMULATION ANNUITY AND PARTICIPANT INTERESTS UNDER THE GROUP
ANNUITY CONTRACTS
 
<TABLE>
<S>                                                           <C>
CONTRACT OWNER TRANSACTION EXPENSES
 
    Sales Charges on Purchase Payments (as a percentage of
      purchase payments)....................................        7%
 
    SEPARATE ACCOUNT ANNUAL EXPENSES--GROWTH SUB-ACCOUNT
      (as a percentage of average daily sub-account net
      assets)
 
        Investment Management Fee Reimbursement.............    (.235)%
        Mortality and Expense Risk Fees.....................     .795%
        Other Expense Reimbursement.........................    (.090)%
                                                              -------
            Total Sub-Account Annual Expenses...............     .470%
                                                              -------
                                                              -------
 
    ADVANTUS SERIES FUND, INC. ANNUAL EXPENSES
      (as a percentage of Advantus Series Fund average net
      assets for the Growth Portfolio)
 
        Growth Portfolio
 
        Investment Management Fees..........................     .500%
        Other Expenses......................................     .090%
                                                              -------
            Total Growth Portfolio Annual Expenses..........     .590%
                                                              -------
                                                              -------
</TABLE>
 
                                                                               5
<PAGE>
EXAMPLE--For contracts using the Growth Portfolio:
 
<TABLE>
<CAPTION>
                                                               1 YEAR    3 YEARS    5 YEARS    10 YEARS
                                                              --------   --------   --------   --------
<S>                                                           <C>        <C>        <C>        <C>
If you surrender your contract at the end of the applicable
  time period:
    You would pay the following expenses on a $1,000
      investment, assuming 5% annual return on assets.......      $80       $101       $124       $190
</TABLE>
 
<TABLE>
<S>                                                           <C>
    SEPARATE ACCOUNT ANNUAL EXPENSES--BOND SUB-ACCOUNT
      (as a percentage of average daily sub-account net
      assets)
        Investment Management Fee Reimbursement.............    (.235)%
        Mortality and Expense Risk Fees.....................     .795%
                                                              -------
            Total Sub-Account Annual Expenses...............     .560%
                                                              -------
                                                              -------
    ADVANTUS SERIES FUND, INC. ANNUAL EXPENSES
      (as a percentage of Advantus Series Fund average net
      assets for the Bond Portfolio)
        Bond Portfolio
        Investment Management Fees..........................     .500%
        Other Expenses......................................     .060%
                                                              -------
            Total Bond Portfolio Annual Expenses............     .560%
                                                              -------
                                                              -------
</TABLE>
 
EXAMPLE--For contracts using the Bond Portfolio:
 
<TABLE>
<CAPTION>
                                                               1 YEAR    3 YEARS    5 YEARS    10 YEARS
                                                              --------   --------   --------   --------
<S>                                                           <C>        <C>        <C>        <C>
If you surrender your contract at the end of the applicable
  time period:
    You would pay the following expenses on a $1,000
      investment, assuming 5% annual return on assets.......      $81       $103       $127       $197
</TABLE>
 
<TABLE>
<S>                                                           <C>
    SEPARATE ACCOUNT ANNUAL EXPENSES--MONEY MARKET
      SUB-ACCOUNT
      (as a percentage of average daily sub-account net
      assets)
        Investment Management Fee Reimbursement.............    (.235)%
        Mortality and Expense Risk Fees.....................     .795%
                                                              -------
            Total Sub-Account Annual Expenses...............     .560%
                                                              -------
                                                              -------
 
    ADVANTUS SERIES FUND, INC. ANNUAL EXPENSES
      (as a percentage of Advantus Series Fund average net
      assets for the Money Market Portfolio)
        Money Market Portfolio
        Investment Management Fees..........................     .500%
        Other Expenses......................................     .100%
                                                              -------
            Total Money Market Portfolio Annual Expenses....     .600%
                                                              -------
                                                              -------
</TABLE>
 
EXAMPLE--For contracts using the Money Market Portfolio:
 
<TABLE>
<CAPTION>
                                                               1 YEAR    3 YEARS    5 YEARS    10 YEARS
                                                              --------   --------   --------   --------
<S>                                                           <C>        <C>        <C>        <C>
If you surrender your contract at the end of the applicable
  time period:
    You would pay the following expenses on a $1,000
      investment, assuming 5% annual return on assets.......      $81       $104       $129       $201
</TABLE>
 
6
<PAGE>
 
<TABLE>
<S>                                                           <C>
    SEPARATE ACCOUNT ANNUAL EXPENSES--ASSET ALLOCATION
      SUB-ACCOUNT
      (as a percentage of average daily sub-account net
      assets)
 
        Investment Management Fee Reimbursement.............    (.235)%
        Mortality and Expense Risk Fees.....................     .795%
                                                              -------
            Total Sub-Account Annual Expenses...............     .560%
                                                              -------
                                                              -------
 
    ADVANTUS SERIES FUND, INC. ANNUAL EXPENSES
      (as a percentage of Advantus Series Fund average net
      assets for the Asset Allocation Portfolio)
 
        Asset Allocation Portfolio
 
        Investment Management Fees..........................     .500%
        Other Expenses......................................     .040%
                                                              -------
            Total Asset Allocation Portfolio Annual
              Expenses......................................     .540%
                                                              -------
                                                              -------
</TABLE>
 
EXAMPLE--For contracts using the Asset Allocation Portfolio:
 
<TABLE>
<CAPTION>
                                                               1 YEAR    3 YEARS    5 YEARS    10 YEARS
                                                              --------   --------   --------   --------
<S>                                                           <C>        <C>        <C>        <C>
If you surrender your contract at the end of the applicable
  time period:
    You would pay the following expenses on a $1,000
      investment, assuming 5% annual return on assets.......      $80       $103       $126       $195
</TABLE>
 
<TABLE>
<S>                                                           <C>
    SEPARATE ACCOUNT ANNUAL EXPENSES--MORTGAGE SECURITIES
      SUB-ACCOUNT
      (as a percentage of average daily sub-account net
      assets)
 
        Investment Management Fee Reimbursement.............    (.235)%
        Mortality and Expense Risk Fees.....................     .795%
                                                              -------
            Total Sub-Account Annual Expenses...............     .560%
                                                              -------
                                                              -------
 
    ADVANTUS SERIES FUND, INC. ANNUAL EXPENSES
      (as a percentage of Advantus Series Fund average net
      assets for the Mortgage Securities Portfolio)
 
        Mortgage Securities Portfolio
 
        Investment Management Fees..........................     .500%
        Other Expenses......................................     .080%
                                                              -------
            Total Mortgage Securities Portfolio Annual
              Expenses......................................     .580%
                                                              -------
                                                              -------
</TABLE>
 
EXAMPLE--For contracts using the Mortgage Securities Portfolio:
 
<TABLE>
<CAPTION>
                                                               1 YEAR    3 YEARS    5 YEARS    10 YEARS
                                                              --------   --------   --------   --------
<S>                                                           <C>        <C>        <C>        <C>
If you surrender your contract at the end of the applicable
  time period:
    You would pay the following expenses on a $1,000
      investment, assuming 5% annual return on assets.......      $81       $104       $128       $199
</TABLE>
 
<TABLE>
<S>                                                           <C>
    SEPARATE ACCOUNT ANNUAL EXPENSES--INDEX 500 SUB-ACCOUNT
      (as a percentage of average daily sub-account net
      assets)
 
        Investment Management Fee Reimbursement.............    (.135)%
        Mortality and Expense Risk Fees.....................     .795%
                                                              -------
            Total Sub-Account Annual Expenses...............     .660%
                                                              -------
                                                              -------
</TABLE>
 
                                                                               7
<PAGE>
<TABLE>
<S>                                                           <C>
    ADVANTUS SERIES FUND, INC. ANNUAL EXPENSES
      (as a percentage of Advantus Series Fund average net
      assets for the Index 500 Portfolio)
 
        Index 500 Portfolio
 
        Investment Management Fees..........................     .400%
        Other Expenses......................................     .050%
                                                              -------
            Total Index 500 Portfolio Annual Expenses.......     .450%
                                                              -------
                                                              -------
</TABLE>
 
EXAMPLE--For contracts using the Index 500 Portfolio:
 
<TABLE>
<CAPTION>
                                                               1 YEAR    3 YEARS    5 YEARS    10 YEARS
                                                              --------   --------   --------   --------
<S>                                                           <C>        <C>        <C>        <C>
If you surrender your contract at the end of the applicable
  time period:
    You would pay the following expenses on a $1,000
      investment, assuming 5% annual return on assets.......      $81       $103       $127       $196
</TABLE>
 
<TABLE>
<S>                                                           <C>
    SEPARATE ACCOUNT ANNUAL EXPENSES--SMALL COMPANY
      SUB-ACCOUNT
      (as a percentage of average daily sub-account net
      assets)
 
        Investment Management Fee Reimbursement.............    (.485)%
        Mortality and Expense Risk Fees.....................     .795%
                                                              -------
            Total Sub-Account Annual Expenses...............     .310%
                                                              -------
                                                              -------
 
    ADVANTUS SERIES FUND, INC. ANNUAL EXPENSES
      (as a percentage of Advantus Series Fund average net
      assets for the Small Company Portfolio)
 
        Small Company Portfolio
 
        Investment Management Fees..........................     .750%
        Other Expenses......................................     .060%
                                                              -------
            Total Small Company Portfolio Annual Expenses...     .810%
                                                              -------
                                                              -------
</TABLE>
 
EXAMPLE--For contracts using the Small Company Portfolio:
 
<TABLE>
<CAPTION>
                                                               1 YEAR    3 YEARS    5 YEARS    10 YEARS
                                                              --------   --------   --------   --------
<S>                                                           <C>        <C>        <C>        <C>
If you surrender your contract at the end of the applicable
  time period:
    You would pay the following expenses on a $1,000
      investment, assuming 5% annual return on assets.......      $81       $103       $127       $197
</TABLE>
 
  The  tables shown above  are to assist  a contract owner  in understanding the
costs and expenses that  a contract will bear  directly or indirectly. For  more
information on contract costs and expenses, see the Prospectus heading "Contract
Charges"  and the information immediately following.  The table does not reflect
deductions for any applicable premium taxes which may be made from each purchase
payment depending upon the applicable law. In addition, Variable Fund D  amounts
in  the Growth Portfolio are shown after the reimbursement (which is made to the
Separate Account Sub-Account for management fees). For additional information on
this reimbursement, see page 13 of this Prospectus.
  Prior to May 3, 1993, several of the Portfolios were known by different names.
The Growth Portfolio was the Stock Portfolio, the Asset Allocation Portfolio was
the Managed Portfolio and the Index 500 Portfolio was the Index Portfolio.
 
8
<PAGE>
TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            Page
<S>                                                                         <C>
Definitions...............................................................     2
 
Synopsis..................................................................     3
 
Expense Table.............................................................     5
 
Condensed Financial Information...........................................    10
 
Financial Statements......................................................    11
 
Performance Data..........................................................    11
 
General Descriptions......................................................    11
 
Contract Deductions
    Sales Charges.........................................................    13
    Premium Taxes.........................................................    13
    Investment Management.................................................    14
    Mortality and Expense Risks...........................................    14
    Expenses..............................................................    14
    Other Expenses........................................................    14
 
Description of the Contracts..............................................    15
 
Voting Rights.............................................................    17
 
Annuity Period............................................................    18
 
Death Benefit.............................................................    20
 
Crediting Accumulation Units..............................................    21
 
Withdrawals and Surrender.................................................    23
 
Distribution..............................................................    24
 
Federal Tax Status........................................................    25
 
Legal Proceedings.........................................................    29
 
Statement of Additional Information.......................................    29
</TABLE>
 
                                                                               9
<PAGE>
CONDENSED FINANCIAL INFORMATION
 
The  financial statements of Minnesota Mutual  Variable Fund D and The Minnesota
Mutual Life  Insurance Company  may  be found  in  the Statement  of  Additional
Information.
  The table below gives per unit information about the financial history of each
sub-account  for  the six  years ended  December  31, 1996  and the  period from
October 26,  1990 to  December 31,  1990.  This information  should be  read  in
conjunction  with the financial statements and related notes of Minnesota Mutual
Variable Fund D included in the Statement of Additional Information.
 
<TABLE>
<CAPTION>
                                                                                                        PERIOD FROM
                                                                                                        OCTOBER 26,
                                                        YEAR ENDED DECEMBER 31,                           1990 TO
                                  -------------------------------------------------------------------   DECEMBER 31,
                                    1996       1995       1994         1993        1992       1991         1990*
                                  ---------  ---------  ---------  ------------  ---------  ---------  --------------
<S>                               <C>        <C>        <C>        <C>           <C>        <C>        <C>
Growth Sub-Account:
    Unit value at beginning of
      period....................    $11.877     $9.604     $9.573     $9.196        $8.803     $6.595       $6.061
    Unit value at end of
      period....................    $13.839    $11.877     $9.604     $9.573        $9.196     $8.803       $6.595
    Number of units outstanding
      at end of period..........  4,666,243  4,918,859  5,406,377  5,785,198     5,758,220  5,842,088    6,024,553
Bond Sub-Account:
    Unit value at beginning of
      period....................     $1.567     $1.316     $1.386     $1.264        $1.191     $1.021       $1.000
    Unit value at end of
      period....................     $1.604     $1.567     $1.316     $1.386        $1.264     $1.191       $1.021
    Number of units outstanding
      at end of period..........    296,978    321,612    386,750    480,411       177,794     66,385       20,037
Money Market Sub-Account:
    Unit value at beginning of
      period....................     $1.186     $1.131     $1.097     $1.074        $1.047     $1.000        --   **
    Unit value at end of
      period....................     $1.238     $1.186     $1.131     $1.097        $1.074     $1.047        --
    Number of units outstanding
      at end of period..........    395,596    352,735    457,011    774,078       357,877    171,773        --
Asset Allocation Sub-Account:
    Unit value at beginning of
      period....................     $1.831     $1.473     $1.502     $1.419        $1.330     $1.038       $1.000
    Unit value at end of
      period....................     $2.048     $1.831     $1.473     $1.502        $1.419     $1.330       $1.038
    Number of units outstanding
      at end of period..........  2,804,901  2,960,127  3,175,751  2,903,712     1,463,845    364,314       13,616
Mortgage Securities Sub-Account:
    Unit value at beginning of
      period....................     $1.473     $1.255     $1.307     $1.203        $1.137     $1.000        --   **
    Unit value at end of
      period....................     $1.542     $1.473     $1.255     $1.307        $1.203     $1.137        --
    Number of units outstanding
      at end of period..........    175,022    136,987    160,939    286,125       265,381      5,173        --
Index 500 Sub-Account:
    Unit value at beginning of
      period....................     $2.148     $1.580     $1.572     $1.442        $1.352     $1.049       $1.000
    Unit value at end of
      period....................     $2.596     $2.148     $1.580     $1.572        $1.442     $1.352       $1.049
    Number of units outstanding
      at end of period..........    923,905    951,303    886,632    684,210       332,893    174,242        5,000
Small Company Sub-Account:
    Unit value at beginning of
      period....................     $1.535     $1.169     $1.107     $1.000
    Unit value at end of
      period....................     $1.624     $1.535     $1.169     $1.107***
    Number of units outstanding
      at end of period..........    114,187    124,882     72,272     14,148
 
<FN>
 
  * The condensed financial information is presented for the period from October
    26, 1990 to December 31,  1990. October 26, 1990  was the effective date  of
    the  1933 Act  Registration for Minnesota  Mutual Variable Fund  D after its
    reorganization as a unit investment trust.
 
 ** As of December 31, 1990, no contract owners had elected to allocate payments
    to the  Money  Market  and Mortgage  Securities  sub-accounts;  accordingly,
    condensed financial information is not presented for the period from October
    26, 1990 to December 31, 1990.
 
***  The information for the sub-account is shown  for the period May 3, 1993 to
    December 31,  1993. May  3, 1993  was the  effective date  of the  1933  Act
    Registration Statement for the sub-account.
</TABLE>
 
10
<PAGE>
- ------------------------------------------------------------------------
FINANCIAL STATEMENTS
 
The  complete financial statements  of Minnesota Mutual Variable  Fund D and The
Minnesota   Mutual Life  Insurance  Company are  included  in the  Statement  of
Additional Information.
 
- ------------------------------------------------------------------------
PERFORMANCE DATA
 
From  time to  time the  Variable Fund  D may  publish advertisements containing
performance data relating to its sub-accounts.  In the case of the Money  Market
Sub-Account,  the  Variable  Fund  D  will  publish  yield  or  effective  yield
quotations for a seven-day or other specified  period. In the case of the  other
sub-accounts,  performance  data will  consist  of average  annual  total return
quotations for a one-year period, five-year period, ten-year period, and for the
period since the sub-account became available pursuant to the Variable Fund  D's
registration  statement, and may also include cumulative total return quotations
for  the  period  since  the  sub-account  became  available  pursuant  to  such
registration statement. The Money Market Sub-Account may also quote such average
annual  and cumulative  total return  figures. Performance  figures used  by the
Variable Fund D  are based  on historical  information of  the sub-accounts  for
specified  periods,  and  the figures  are  not  intended to  suggest  that such
performance will continue  in the  future. Performance figures  of the  Variable
Fund D will reflect only charges made pursuant to the terms of contracts offered
by  this prospectus.  The various  performance figures  used in  Variable Fund D
advertisements relating  to  the  contracts described  in  this  Prospectus  are
summarized  below. More detailed information on the computations is set forth in
the Statement of Additional Information.
 
MONEY MARKET SUB-ACCOUNT YIELD.
Yield quotations  for the  Money  Market Sub-Account  are  based on  the  income
generated  by an investment in the  sub-account over a specified period, usually
seven days.  The  figures  are  "annualized," that  is,  the  amount  of  income
generated  by the investment during the period is assumed to be generated over a
52-week period and is shown as  a percentage of the investment. Effective  yield
quotations are calculated similarly, but when annualized the income earned by an
investment  in  the sub-account  is assumed  to  be reinvested.  Effective yield
quotations will  be  slightly  higher  than  yield  quotations  because  of  the
compounding  effect  of this  assumed  reinvestment. Yield  and  effective yield
figures quoted  by  the  sub-account  will not  reflect  the  deduction  of  any
applicable deferred sales charges.
 
TOTAL RETURN FIGURES.
Cumulative  total  return  figures  may also  be  quoted  for  all sub-accounts.
Cumulative total return  is based  on a  hypothetical $1,000  investment in  the
sub-account  at the  beginning of  the advertised  period, and  is equal  to the
percentage change between the $1,000 net  asset value of that investment at  the
beginning of the period and the net asset value of that investment at the end of
the period.
  Prior  to May  3, 1993,  several of the  sub-accounts were  known by different
names. The Growth Sub-Account  was the Stock  Sub-Account, the Asset  Allocation
Sub-Account  was the Managed Sub-Account, and  the Index 500 Sub-Account was the
Index Sub-Account.
  All cumulative  total  return  figures  published  for  sub-accounts  will  be
accompanied  by  average  annual total  return  figures for  a  one-year period,
five-year period,  ten-year period,  and for  the period  since the  sub-account
became  available pursuant to the Variable Fund D's registration statement. With
respect to  the Growth  Sub-Account, cumulative  total return  quotations  which
include  periods prior to October 1990  assume investment in the underlying fund
for the period prior to the actual  availability of that investment option as  a
result  of  the  Variable Fund  D  reorganization. Average  annual  total return
figures will show  for the specified  period the average  annual rate of  return
required  for an initial  investment of $1,000  to equal the  surrender value of
that investment  at the  end of  the period.  Such average  annual total  return
figures  may also be accompanied by average  annual total return figures for the
same or other periods.
 
- ------------------------------------------------------------------------
GENERAL DESCRIPTIONS
 
A.  THE MINNESOTA MUTUAL LIFE INSURANCE COMPANY
The Minnesota Mutual Life Insurance Company  is a mutual life insurance  company
organized  in 1880 under the laws of Minnesota. Its home office is at 400 Robert
Street North, St. Paul, Minnesota 55101-2098  (612 665-3500). It is licensed  to
do  a life  insurance business in  all states  of the United  States (except New
York, where it is  an authorized reinsurer), the  District of Columbia,  Canada,
Puerto Rico, and Guam.
 
                                                                              11
<PAGE>
B.  MINNESOTA MUTUAL VARIABLE FUND D
On  October 16, 1967,  the Board of  Trustees of Minnesota  Mutual established a
separate account in  accordance with certain  provisions of Minnesota  Insurance
Law.  Minnesota Mutual  Variable Fund  D is  the name  by which  this account is
designated. The  Variable  Fund D  was  registered as  an  open-end  diversified
management  investment  company under  the Investment  Company  Act of  1940, as
amended (the  "1940  Act"). The  separate  account  meets the  definition  of  a
separate account under the federal securities laws.
  The  Minnesota law  under which the  Variable Fund D  was established provides
that the assets of the Variable Fund D shall not be chargeable with  liabilities
arising  out of any other business which Minnesota Mutual may conduct, but shall
be held and applied exclusively for the benefit of the holders of those variable
annuity contracts for which the Variable Fund D was established. The  investment
performance  of  the  Variable  Fund  D  is  entirely  independent  of  both the
investment performance of our general account and of any other separate  account
which  we may have established or may later establish. All obligations under the
contracts are general corporate obligations of Minnesota Mutual.
  At a Special Meeting  of contract owners and  participants of Variable Fund  D
held  October  23,  1990,  the  contract  owners  and  participants  approved an
Agreement and  Plan of  Reorganization  whereby Variable  Fund  D (which  was  a
management  investment  company investing  primarily  in a  portfolio  of equity
securities, mainly common stocks)  transferred all of its  assets to the  Growth
Portfolio  of the  Advantus Series  Fund, Inc.  in exchange  for shares  of that
Portfolio. Variable Fund D was reconstituted and registered as a unit investment
trust under the  1940 Act. As  part of  that Reorganization it  now consists  of
seven  sub-accounts, each investing  its assets solely  in the shares  of one of
seven of the Series Fund Portfolios. The Series Fund has a number of  Portfolios
which are not available to Variable Fund D. Registration with the Securities and
Exchange  Commission  (the "Commission")  does  not involve  supervision  of the
management or investment  policies or practices  of the Variable  Fund D by  the
Commission.
 
C.  ADVANTUS SERIES FUND, INC.
  The  Variable Fund  D currently invests  exclusively in  Advantus Series Fund,
Inc. (the "Series  Fund"), a mutual  fund of the  series type. Prior  to May  1,
1997,  the name of the Series Fund was "MIMLIC Series Fund, Inc." On January 14,
1997, the Series Fund's Board of  Directors approved an amendment of the  Series
Fund's  Articles of Incorporation  for the purpose  of changing the  name of the
Series Fund to "Advantus Series Fund,  Inc." effective May 1, 1997. The  purpose
of  the name change is  to provide the Series Fund  with a more distinctive name
which may provide greater  visibility and name  recognition, which reflects  the
name  of its adviser,  and which may  provide additional marketing opportunities
for variable contracts investing in shares of the Series Fund. The change in the
Series Fund's  name will  not result  in any  change in  investment  objectives,
policies  or practices for the Series Fund  or any of its portfolios. The Series
Fund is registered with the Securities and Exchange Commission as a diversified,
open-end management investment company, but  such registration does not  signify
that  the Commission supervises  the management, or  the investment practices or
policies, of the Series Fund. The Series Fund issues its shares, continually and
without sales charge, only to our separate accounts, which currently include the
Variable Annuity Account, the Variable Life Account, Variable Fund D, the  Group
Variable  Annuity Account, and the Group Universal Life Account. The Series Fund
may be made available to other separate accounts as new products are  developed,
and may be used as the underlying investment medium for separate accounts of the
Northstar  Life Insuarance Company, a  wholly-owned subsidiary of ours domiciled
in the State of New  York. Shares are sold and  redeemed at net asset value.  In
the  case of a newly  issued contract, purchases of  shares of the Portfolios of
the Series Fund in connection with the  first purchase payment will be based  on
the  values next determined after issuance of the contract by us. Redemptions of
shares of the Portfolios of the Series Fund are made at the net asset value next
determined from the day we receive a request for transfer, partial withdrawal or
surrender at our home office. In the case of outstanding contracts, purchases of
shares of the Portfolio of the Series Fund  for the Variable Fund D are made  at
the  net  asset value  of such  shares next  determined after  receipt by  us of
contract purchase payments.
  The Series  Fund's investment  adviser is  Advantus Capital  Management,  Inc.
("Advantus  Capital"). Advantus Capital  is a wholly-owned  subsidiary of MIMLIC
Asset Management
 
12
<PAGE>
Company ("MIMLIC Management") which, prior to May 1, 1997, served as  investment
adviser  to the Series  fund. MIMLIC Management is  a wholly-owned subsidiary of
Minnesota Mutual. The same portfolio managers and other personnel who previously
provided  investment  advisory  services  to  the  Series  Fund  through  MIMLIC
Management  continue  to provide  the  same services  through  Advantus Capital.
Advantus Capital acts as an investment adviser to the Series Fund pursuant to an
advisory agreement.
  A prospectus for  the Series  Fund is attached  to this  Prospectus. A  person
should  carefully read this Variable  Fund D Prospectus and  that for the Series
Fund before investing in the contracts.
  It is conceivable that  in the future it  may be disadvantageous for  variable
life  insurance  separate accounts  and  variable annuity  separate  accounts to
invest in the  Series Fund  simultaneously. Although Minnesota  Mutual does  not
currently  foresee  any such  disadvantages  either to  variable  life insurance
policy owners or to variable annuity contract owners, the Series Fund's Board of
Directors intends to monitor events in order to identify any material  conflicts
between  such policy owners and contract owners and to determine what action, if
any, should be taken in response thereto. Such action could include the sale  of
Series  Fund shares by  one or more  of the separate  accounts, which could have
adverse consequences. Material  conflicts could  result from,  for example,  (1)
changes  in state  insurance law,  (2) changes in  Federal income  tax laws, (3)
changes in the  investment management  of any of  the Portfolios  of the  Series
Fund,  or (4) differences  in voting instructions between  those given by policy
owners and those given by contract owners.
 
D.  ADDITIONS, DELETIONS OR SUBSTITUTIONS
We retain the right, subject to  any applicable law, to make substitutions  with
respect  to  the investments  of the  sub-accounts  of the  Variable Fund  D. If
investment in a fund should no longer be possible or if we determine it  becomes
inappropriate  for contracts of this class, we may substitute another fund for a
sub-account. Substitution may be with  respect to existing accumulation  values,
future purchase payments and future annuity payments.
  We  may also establish additional  sub-accounts in the Variable  Fund D and we
reserve the right  to add, combine  or remove any  sub-accounts of the  Variable
Fund  D. Each additional sub-account will purchase  shares in a new portfolio or
mutual fund. Such sub-accounts may be established when, in our sole  discretion,
marketing,  tax,  investment or  other conditions  warrant such  action. Similar
considerations will be used by us  should there be a determination to  eliminate
one  or more  of the sub-accounts  of the Variable  Fund D. The  addition of any
investment option will  be made available  to existing contract  owners on  such
basis as may be determined by us.
 
  We  also reserve the right, when permitted by law, to de-register the Variable
Fund D under the Investment  Company Act of 1940,  to restrict or eliminate  any
voting  rights of the contract  owners, and to combine  the Variable Fund D with
one or more of our other separate accounts.
 
- ------------------------------------------------------------------------
CONTRACT DEDUCTIONS
 
SALES CHARGES
MIMLIC Sales  acts as  principal underwriter  and performs  all sales  functions
relative  to the contracts, for which a certain amount is deducted from purchase
payments received under the contracts.
  Minnesota  Mutual  performs  all  administrative  functions  relative  to  the
contracts.  Minnesota Mutual  bears all  expenses associated  with the  sale and
administration of the contracts, such as sales commissions, fees and expenses of
the Committee, salaries, rent, postage, telephone, travel, office equipment  and
stationery, and legal, actuarial and auditing fees.
  The  sales charge  is equal to  7% of  purchase payments (7.53%  of the amount
invested) on  all contracts.  For the  treatment of  certain Group  Accumulation
Annuity Contracts, see the section on divisible surplus on page 17.
  To  the extent that sales charges  are insufficient to recover sales expenses,
Minnesota Mutual will pay sales expenses from its other assets or surplus. These
assets may include proceeds from the mortality and expense risk charge described
below.
 
PREMIUM TAXES
Deductions for  any applicable  premium taxes  may be  made from  each  purchase
payment  (currently such premium taxes range from 0% to 3.5%) depending upon the
applicable law.
 
                                                                              13
<PAGE>
INVESTMENT MANAGEMENT
Under contracts funded by Variable Fund D, all costs of operating Variable  Fund
D  as an investment management company  originally were covered by an investment
management fee of .265%  of contract or  account values on  an annual basis.  As
Variable  Fund D is now a unit investment trust rather than a managed investment
company, that  investment  management  fee  no longer  will  be  paid.  However,
contract  values that are allocated  to sub-accounts of Variable  Fund D will be
invested in Series Fund  Portfolios that do pay  investment advisory fees (at  a
rate  of .40% on an annual basis for the Index 500 Portfolio, .75% for the Small
Company Portfolio and .50% for each of the five other available Portfolios)  and
do  incur other  operating expenses.  Those other  operating expenses  have been
voluntarily subsidized  by Minnesota  Mutual  to the  extent that  the  expenses
exceed  .15% on an annual basis for any Portfolio. While Minnesota Mutual has no
present intention to alter that practice, it is under no obligation to  continue
it.
  To  ensure that Contract Owners and Participants continue to get at least what
they originally  expected under  their contracts,  Minnesota Mutual  has  agreed
that,  each valuation period,  in calculating the net  investment factor for the
Growth sub-account of Variable  Fund D, it will  make adjustments that have  the
effect of reimbursing the excess of any expenses indirectly incurred as a result
of  the investment advisory fee paid and  the operating expenses incurred by the
Growth Portfolio of the Series Fund over the former .265% investment  management
fee.  Accordingly, to the extent that the contract or account values continue to
be allocated to the sub-account that,  in effect, continues the Variable Fund  D
investment  objective when it was operating  as a management investment company,
there will be no change in the level of charges for the provision of  investment
management  services. In  calculating the  net investment  factor for  the other
sub-accounts of Variable Fund D, Minnesota Mutual will make adjustments that, in
effect, reimburse the excess  of the investment  advisory fees incurred  through
indirect  investment  in  the  Series  Fund  Portfolios  and  the  former  .265%
investment management fee;  however, any other  Series Fund Portfolio  operating
expenses  would not be subject to  the reimbursement. Accordingly, to the extent
that a Contract  Owner or Participant  chose to take  advantage of the  Variable
Fund  D sub-accounts other  than the Growth  Sub-Account, he or  she could incur
additional expenses.
 
MORTALITY AND EXPENSE RISKS
Minnesota Mutual assumes the mortality risk under the contract by its obligation
to continue to make monthly annuity payments, determined in accordance with  the
annuity  rate tables  and other  provisions contained  in the  contracts to each
annuitant regardless of how long he or she lives and regardless of how long  all
annuitants  as a group live.  Thus, neither an annuitant's  own longevity nor an
improvement in life  expectancy generally  will have  an adverse  effect on  the
monthly annuity payments an annuitant will receive under the contract.
  Minnesota  Mutual assumes an expense risk by assuming the risk that deductions
provided for in  the contracts  for expenses may  be insufficient  to cover  the
actual expenses incurred.
  For  assuming these risks,  Minnesota Mutual currently  makes a deduction from
the Variable Fund D at the rate of  .1325% per annum for the mortality risk  and
 .6625%  per annum  for the  expense risk. These  deductions may  be increased or
decreased by resolution of  the Board of Trustees  of Minnesota Mutual, but  not
more  often than annually, and  in no event will  the combined deductions exceed
the amount of  the present  deduction of  .795% per annum.  If the  sum of  such
deductions  is insufficient to  cover the risks  assumed, the loss  will fall on
Minnesota Mutual. Conversely,  if the deductions  provide more than  sufficient,
any excess will be credited to the surplus of Minnesota Mutual.
 
EXPENSES
The  Variable Fund  D has no  expenses which  are not covered  by the deductions
listed  above.  Minnesota  Mutual  performs  all  the  administrative  functions
relative  to the contracts  and it also  bears all expenses  associated with the
administration of the  contracts. These  include such items  as salaries,  rent,
postage,   telephone,  travel,  office  equipment  and  stationery,  and  legal,
actuarial and auditing fees.
 
OTHER EXPENSES
The underlying Portfolios also  bear certain expenses.  See the Advantus  Series
Fund, Inc. prospectus for more information.
 
14
<PAGE>
- ------------------------------------------------------------------------
DESCRIPTION OF THE CONTRACTS
 
DESCRIPTION
The  following material is intended to provide a general description of contract
terms. In the event that there are questions concerning the contracts which  are
not discussed or should you desire additional information, then inquiries may be
addressed  to us at: Minnesota Mutual Life  Center, 400 Robert Street North, St.
Paul, Minnesota 55101-2098.
 
1.  TYPES OF CONTRACTS
Minnesota Mutual continuously offers three  types of variable annuity  contracts
pursuant to this Prospectus:
 
    (a)  Individual Accumulation Annuity.  This type of contract  may be used in
        connection  with   all  types   of  qualified   plans,  state   deferred
        compensation plans or with individual retirement annuities adopted by or
        on  behalf  of individuals  pursuant  to Section  408  of the  Code. The
        contract provides for a  variable annuity or a  fixed dollar annuity  to
        begin  at some future date, the purchase payments for the contract to be
        paid prior to  the annuity  commencement date  in a  series of  payments
        flexible in respect to the date and amount of payment. The amount of the
        first  monthly annuity payment at retirement  is determined by the value
        of the contract at that time.
 
    (b) Group  Accumulation  Annuity. This  type  of  contract may  be  used  in
        connection  with  any type  of qualified  plan  and with  state deferred
        compensation plans. Purchase payments on behalf of each participant  are
        determined  by a formula specified in  the plan. Individual accounts are
        maintained for each  participant. The contract  provides for a  variable
        annuity  or a fixed  dollar annuity to begin  at a participant's annuity
        commencement date. The amount  of the first  monthly annuity payment  at
        retirement is determined by the value of a participant's account at that
        time.
 
        Under  some  circumstances  group  contract  owners  may  limit purchase
        payments, allocations and  transfers only  to a limited  number of  sub-
        accounts.  In those cases, not all of the sub-accounts offered under the
        contracts will be available to participants in those groups.
 
    (c)  Group  Deposit  Administration.  This  type  of  contract  is  used  in
        connection  with noncontributory  pension plans  qualified under Section
        401(a) or  403(a)  of the  Code,  and  is designed  to  provide  maximum
        flexibility  to the contract  owner in funding  the benefits promised by
        the plan.  No allocation  of purchase  payments is  made for  individual
        participants,  and individual accounts are not maintained. The amount of
        a participant's first monthly annuity payment is determined by the terms
        of the plan. Annuity payments to a participant may be provided on either
        a fixed dollar or a variable annuity basis. The contract owner has  wide
        latitude  in  determining the  appropriate  level of  purchase payments,
        including assumptions with respect to discounts for mortality, turnover,
        and an assumed rate of investment return.
 
2.  ISSUANCE OF CONTRACTS
The contracts are  issued to the  contract owner named  in the application.  The
owner  may be the  annuitant or someone  else; however, once  the owner has been
named in the application the ownership of the contract may not be changed.
 
3.  RIGHT OF REVOCATION
The purchaser  of an  Individual Accumulation  Annuity Contract  may revoke  the
contract  within  ten days  after its  delivery,  for any  reason, on  notice to
Minnesota Mutual at 400 Robert Street North, St. Paul, Minnesota, of his or  her
intention  to revoke. If the contract  is revoked and returned, Minnesota Mutual
will refund  to  the purchaser  the  greater of  the  total amount  of  purchase
payments or the surrender value of the contract, adjusted in the latter case for
deductions  and sales charges as described in this Prospectus under "Withdrawals
and Surrender" on page 23.
  In some states, such as California, the  free look period may be extended.  In
California,  the free look period is extended to thirty days' time for contracts
issued or delivered to owners that are 60  years of age or older at the time  of
delivery. These rights are subject to change and may vary among the states.
 
                                                                              15
<PAGE>
4.  ANNUITY PAYMENTS
Variable annuity payments are determined on the basis of (a) the mortality table
specified in the contract, which reflects the age of the annuitant, (b) the type
of  annuity payment option  selected, and (c) the  investment performance of the
Variable Fund  D.  The amount  of  the variable  annuity  payments will  not  be
affected by adverse mortality experience or by an increase in Minnesota Mutual's
expenses  in excess of the expense deductions  provided for in the contract. The
annuitant will receive the value of a fixed number of annuity units each  month.
The  value of such  units and thus  the amounts of  the monthly annuity payments
will, however, reflect investment gains and losses and investment income of  the
Variable  Fund D, and  thus the annuity  payments will vary  with the investment
experience of the assets of the Variable Fund D.
 
5.  MODIFICATION OF THE CONTRACT
The contract may be modified at any time by written agreement between  Minnesota
Mutual  and the  contract owner.  However, no  such modification  will adversely
effect the rights of a participant under the contract unless the modification is
made to comply with a law or government regulation.
 
6.  ASSIGNMENT
The contract may not  be assigned, sold, transferred,  discounted or pledged  as
collateral for a loan or as security for the performance of an obligation or for
any  other purpose, and to the maximum extent permitted by law, benefits payable
under the contract shall be exempt from the claims of creditors.
 
7.  LIMITATIONS ON PURCHASE PAYMENTS
The minimum purchase payment for the  first contract year under a Group  Deposit
Administration Contract is $3,000.
  The  minimum periodic purchase payment which  may be allocated to the Variable
Fund D on behalf  of each participant under  an Individual Accumulation  Annuity
Contract  and under  a Group Accumulation  Annuity Contract is  $10. If purchase
payments under such contracts are allocated in  part to the Variable Fund D  and
in part to Minnesota Mutual's general assets, the minimum which may be allocated
on  behalf of a participant on either  basis is $10. Currently, Minnesota Mutual
is waiving the enforcement of this provision.
  Under the terms  of the contracts,  Minnesota Mutual may  limit the amount  of
purchase  payments which  will be  accepted on behalf  of a  participant for any
contract year  to  the greater  of  (a) the  purchase  payments made  under  the
contract  on behalf of  such participant for  the immediately preceding contract
year, or (b) the average purchase payments made under the contract on behalf  of
such participant for all prior contract years.
  There  may be  limits on  the maximum  contributions to  retirement plans that
qualify for special tax treatment.
 
8.  DISCONTINUANCE OF PURCHASE PAYMENTS
Purchase payments  for  a contract  may  be  discontinued under  either  of  the
following circumstances:
 
    (a)  The  contract owner  may  discontinue purchase  payments  as of  a date
        specified in a written  notice to Minnesota  Mutual, provided that  such
        date  may not  be earlier than  the date Minnesota  Mutual receives such
        notice.
 
    (b) Minnesota  Mutual may  discontinue acceptance  of purchase  payments  by
        giving written notice to the contract owner if the contract is no longer
        part  of a plan qualified under Section 401(a), 403(a), 403(b), 408, 457
        or other provisions of the Code allowing similar tax treatment.
 
  Upon discontinuance of purchase payments, the contract will continue in  force
in  a paid-up  status. Purchase  payments may  subsequently be  resumed under an
Individual Accumulation  Annuity  Contract at  any  date prior  to  the  annuity
commencement  date unless  the contract value  has previously  been disbursed by
Minnesota Mutual. Under a group contract, purchase payments may be resumed  only
with  the  written  consent  of  Minnesota  Mutual.  Discontinuance  of purchase
payments will have no effect on participants who are receiving annuity payments.
 
9.  CONTRACT SETTLEMENT
Whenever any payment under  a contract is  to be made in  a single sum,  payment
will  be made within seven days after the date such payment is called for by the
terms of the contract, except as payment may be subject for postponement for:
 
    (a) any period during which the New York Stock Exchange is closed other than
        customary weekend and holiday closings,  or during which trading on  the
        New   York  Stock   Exchange  is   restricted,  as   determined  by  the
 
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<PAGE>
        Securities and Exchange Commission;
 
    (b) any  period  during which  an  emergency  exists as  determined  by  the
        Commission  as  a result  of  which it  is  not reasonably  practical to
        dispose of securities in the Variable Fund D or to fairly determine  the
        value of the assets of the Variable Fund D; or
 
    (c)  such  other periods  as  the Commission  may  by order  permit  for the
        protection of the contract owners.
 
10.  PARTICIPATION IN DIVISIBLE SURPLUS
The  contracts  participate  in  the  divisible  surplus  of  Minnesota  Mutual,
according  to  the annual  determination  of its  Board  of Trustees  as  to the
portion, if any, of the divisible surplus of Minnesota Mutual which has  accrued
on the contracts.
  No  assurance can be given as to the amount of divisible surplus, if any, that
will be distributable under these contracts in the future. Such amount may arise
if  mortality  and  expense  experience  is  more  favorable  than  assumed.  No
distributions  of divisible surplus have been declared on these contracts except
as to certain  Group Accumulation  Annuity Contracts,  sold under  circumstances
which reduce sales expenses to Minnesota Mutual. In such contracts, the dividend
is  credited to purchase payments in anticipation of reduced expenses. When this
application of the  dividend is made  it has  the effect of  reducing the  sales
charge  and  results  in  the crediting  of  additional  accumulation  units. No
distributions of divisible surplus arising  from mortality experience have  been
declared,  but  such  surplus could  arise  in  the future  under  certain Group
Accumulation Annuity Contracts where mortality experience is more favorable than
assumed. When a distribution of divisible  surplus from this source is made,  it
may take the form of additional payments to retired participants.
 
- ------------------------------------------------------------------------
VOTING RIGHTS
 
The  Series Fund shares held in  the Variable Fund D will  be voted by us at the
regular and special meetings of the Series  Fund. Shares will be voted by us  in
accordance with instructions received from contract owners with voting interests
in  each sub-account of  the Variable Fund  D. In the  event no instructions are
received from a contract owner, we will  vote such shares of the Series Fund  in
the  same proportion as  shares of the  Series Fund for  which instructions have
been received from contract owners with voting interests in each sub-account  of
the  Variable Fund D. In the event  no instructions are received from a contract
owner, with respect to  shares of a Portfolio  held by a sub-account,  Minnesota
Mutual  will vote such  shares of the  Portfolio and shares  not attributable to
contracts in  the  same proportion  as  shares of  the  Portfolio held  by  such
sub-account for which instructions have been received. The number of votes which
are  available  to  a contract  owner  will  be calculated  separately  for each
sub-account of the Variable Fund D.  If, however, the Investment Company Act  of
1940 or any regulation under that Act should change so that we may be allowed to
vote shares in our own right, then we may elect to do so.
  During  the accumulation period of each contract, the contract owner holds the
voting interest in  each contract.  The number of  votes will  be determined  by
dividing the accumulation value of the contract attributable to each sub-account
by  the net asset value  per share of the underlying  Series Fund shares held by
that sub-account.
  During the annuity  period of each  contract, the annuitant  holds the  voting
interest  in each contract. The  number of votes will  be determined by dividing
the reserve for  each contract allocated  to each sub-account  by the net  asset
value  per share of the underlying Series  Fund shares held by that sub-account.
After an annuity begins, the votes attributable to any particular contract  will
decrease   as  the  reserves  decrease.  In  determining  any  voting  interest,
fractional shares will be recognized.
  We  shall  notify  each  contract  owner   or  annuitant  of  a  Series   Fund
shareholders'  meeting if the shares held  for the contract owner's contract may
be voted  at such  meeting. We  will also  send proxy  materials and  a form  of
instruction so that you can instruct us with respect to voting.
 
                                                                              17
<PAGE>
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ANNUITY PERIOD
 
1.  ELECTING THE RETIREMENT DATE AND FORM OF ANNUITY
The  contracts provide for four optional annuity  forms, any one of which may be
elected if permitted  by law. Each  annuity option  may be elected  on either  a
variable  annuity or  a fixed  dollar annuity  basis, or  a combination thereof.
Other annuity options may be available on request to Minnesota Mutual.
  While the contracts require that notice of election to begin variable  annuity
payments  must be received by Minnesota Mutual at least thirty days prior to the
annuity  commencement  date,   Minnesota  Mutual  is   currently  waiving   that
requirement  for such  annuity elections  received at  least two  valuation days
prior to the  fifteenth of  the month. Minnesota  Mutual reserves  the right  to
enforce  the  thirty day  notice requirement  at  its option  at anytime  in the
future.
  Annuity payments are always made as of the first day of a month. The contracts
require that notice of election to begin annuity payments must be received by us
at least thirty days prior to the annuity commencement date. However,  Minnesota
Mutual  currently waives  this requirement,  and at  the same  time reserves the
right to enforce the thirty day notice at its option in the future.
  Money will be transferred to the  General Account for the purpose of  electing
fixed annuity payments, or to the appropriate variable sub-accounts for variable
annuity payments, on the valuation date coincident with the first valuation date
following  the  fourteenth day  of the  month  preceding the  date on  which the
annuity is to begin.
  If a request for a fixed annuity is received between the first valuation  date
following  the fourteenth day of the month and the second to last valuation date
of the month  prior to commencement,  the transfer will  occur on the  valuation
date  coincident  with  or next  following  the  date on  which  the  request is
received. If a fixed  annuity request is  received after the  third to the  last
valuation  day  of the  month prior  to commencement,  it will  be treated  as a
request received the following month, and the commencement date will be  changed
to the first of the month following the requested commencement date. The account
value  used to determine fixed annuity payments will be the value as of the last
valuation date of the month preceding the date the fixed annuity is to begin.
  If a  variable annuity  request is  received after  the third  valuation  date
preceding  the first  valuation date following  the fourteenth day  of the month
prior to the commencement  date, it will  be treated as  a request received  the
following  month, and the commencement date will  be changed to the first of the
month following  the requested  commencement  date. The  account value  used  to
determine the initial variable annuity payment will be the value as of the first
valuation  date following the fourteenth day of  the month prior to the variable
annuity begin date.
  If an election has not been made  otherwise, and the plan does not specify  to
the  contrary, the  annuitant's retirement  date shall be  the first  day of the
calendar month next following his or her 65th birthday, the annuity option shall
be Option 2A, a life annuity with a period certain of 120 months. In this event,
a fixed annuity will be provided by any general account accumulation value and a
variable annuity will be provided by any Variable Fund D accumulation value. The
minimum first monthly annuity payment on either a variable or fixed dollar basis
is $20. If such first monthly payment  would be less than $20, Minnesota  Mutual
may  fulfill its obligation by paying in a  single sum the value of the contract
which would otherwise have been applied to provide annuity payments.
  The contracts permit annuity payments to begin  on the first day of any  month
after the 50th birthday and before the 75th birthday of the annuitant.
  Once  annuity payments have  commenced, the annuitant  cannot surrender his or
her annuity benefit and receive a single sum settlement in lieu thereof.
  Benefits under  retirement  plans  that  qualify  for  special  tax  treatment
generally  must commence no later  than the April 1  following the year in which
the participant  reaches age  70 1/2  and are  subject to  other conditions  and
restrictions.
  The mortality and expense risks charge continues to be deducted throughout the
annuity  period under each of the available annuity options, including Option 4,
under which there is no mortality risk to Minnesota Mutual.
 
2.  OPTIONAL ANNUITY FORMS
 
OPTION 1--LIFE ANNUITY
This is an  annuity payable  monthly during the  lifetime of  the annuitant  and
terminating  with the last monthly payment preceding the death of the annuitant.
This option offers the maximum
 
18
<PAGE>
amount of monthly payments since  there is no guarantee  of a minimum number  of
payments  or  provision  for a  death  benefit  for beneficiaries.  It  would be
possible under this option for the annuitant to receive only one annuity payment
if he or she died prior to the due date of the second annuity payment, two if he
or she died before the due date of the third annuity payment, etc.
 
OPTION 2--LIFE ANNUITY WITH A PERIOD CERTAIN OF 120 MONTHS (OPTION 2A), 180
MONTHS (OPTION 2B), OR 240 MONTHS (OPTION 2C)
This is an annuity  payable monthly during the  lifetime of the annuitant,  with
the  guarantee that if the annuitant dies before payments have been made for the
period certain elected,  payments will  continue to the  beneficiary during  the
remainder  of the period  certain; or if  the beneficiary so  elects at any time
during the remainder of the period  certain, the present value of the  remaining
guaranteed  number of payments, based  on the then current  dollar amount of one
such payment shall be paid in a single sum to the beneficiary.
 
OPTION 3--JOINT AND LAST SURVIVOR ANNUITY
This is an annuity  payable monthly during the  joint lifetime of the  annuitant
and  a designated joint annuitant and continuing thereafter during the remaining
lifetime of the survivor. Under this option  there is no guarantee of a  minimum
number of payments or provision for a death benefit for beneficiaries.
 
OPTION 4--PERIOD CERTAIN ANNUITY
This  is an annuity payable monthly for a  Period Certain of from 3 to 15 years,
as elected. If the annuitant dies before payments have been made for the  Period
Certain  elected, payments will continue to the beneficiary during the remainder
of such Period Certain.  At any time  during the payment  period, the payee  may
elect that (1) the present value of the remaining guaranteed number of payments,
based  on the then current dollar amount of  one such payment and using the same
interest rate which served as a basis for the annuity, shall be paid in a single
sum, or (2) such commuted amount shall be applied to effect a life annuity under
Option 1 or Option 2.
 
3.  VALUE OF THE ANNUITY UNIT
The value of an annuity unit is determined  monthly as of the first day of  each
month.  The  value  of the  annuity  unit on  the  first  day of  each  month is
determined by multiplying the value on the  first day of the preceding month  by
the  product of (a) .997137, and (b) the  ratio of the value of the accumulation
unit for the valuation date next  following the fourteenth day of the  preceding
month  to  the  value of  the  accumulation  unit for  the  valuation  date next
following the fourteenth day of the second preceding month. (.997137 is a factor
to neutralize the assumed net investment rate, discussed in Section 4 below,  of
3.5%  per annum built into the annuity rate tables contained in the contract and
which is  not applicable  because the  actual net  investment rate  is  credited
instead.)  The value of an annuity unit as  of any date other than the first day
of a month is  equal to its  value as of  the first day  of the next  succeeding
month.
 
4.  DETERMINATION OF AMOUNT OF FIRST MONTHLY ANNUITY PAYMENT
Under the Group Deposit Administration Contract, the amount of the first monthly
annuity  payment is determined as provided in the plan. Under the other types of
contracts described in  this Prospectus,  the first monthly  annuity payment  is
determined  by the value at retirement  of the participant's individual account.
In addition, a number of states do, however, impose a premium tax on the  amount
used to purchase annuity benefits, depending on the type of plan involved. These
taxes,  where applicable, currently range from 0%  to 3.5% and are deducted from
the contract value applied to provide annuity payments, though Minnesota  Mutual
reserves  the right to make  such deductions from purchase  payments as they are
received.
  When annuity payments commence, the value of the contract is determined as the
product of  (a) the  number of  accumulation units  credited to  the  individual
account  as  of the  date annuity  payments commence,  and (b)  the value  of an
accumulation unit for the  valuation date next following  the fourteenth day  of
the month prior to the month in which annuity payments commence.
  The  contracts contain tables  indicating either (a) the  dollar amount of the
first monthly payment under each optional annuity form for each $1,000 of  value
applied,  or (b) the dollar amount of  value required to provide a first monthly
payment of  $1.00 under  each optional  annuity form.  The amount  of the  first
monthly  payment depends on  the optional annuity form  elected and the adjusted
age of the annuitant.
  A formula for determining the adjusted  age is contained in the contract.  The
tables are
 
                                                                              19
<PAGE>
determined  from the Progressive Annuity Table with interest at the rate of 3.5%
per annum, assuming  births in the  year 1900. The  total first monthly  annuity
payment is determined by multiplying the number of thousands of dollars of value
applied  (less  any applicable  premium taxes  not  previously deducted)  by the
amount of the first monthly payment per  $1,000 of value from the tables in  the
contract.  The 3.5%  interest rate assumed  in the annuity  tables would produce
level annuity payments if the net investment rate remained constant at 3.5%  per
year. Subsequent payments will be less than, equal to, or greater than the first
payment  depending upon  whether the  actual net  investment rate  is less than,
equal to, or  greater than  3.5%. A  higher interest  rate would  mean a  higher
initial  payment, but a more  slowly rising (or more  rapidly falling) series of
subsequent payments. A lower assumption would have the opposite effect.
 
5.  AMOUNT OF SECOND AND SUBSEQUENT MONTHLY ANNUITY PAYMENTS
The amount of the first monthly annuity payment, determined as described  above,
is  divided by  the then  current annuity unit  value on  the date  of the first
payment to  determine the  number  of annuity  units  represented by  the  first
payment.  This number  of annuity  units remains  constant during  the period of
annuity payments, and in each subsequent month, the dollar amount of the annuity
payment is determined by  multiplying this constant number  of annuity units  by
the then current value of an annuity unit.
  The  Statement  of  Additional  Information contains  an  illustration  of the
calculation of annuity unit values and of a variable annuity payment showing the
method used for the calculation of both the initial and subsequent payments.
 
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DEATH BENEFIT
 
Death proceeds, if  any, payable  under Group  Deposit Administration  Contracts
shall  be in such  amount as is  determined by the  provisions of the applicable
qualified  trust  or  plan.  The  Individual  Accumulation  Annuity  and   Group
Accumulation  Annuity Contracts provide  that in the  event of the  death of the
participant prior  to  the  commencement of  annuity  payments,  death  proceeds
payable  will be the value of the participant's individual account determined as
of the valuation date coincident  with or next following  the date due proof  of
death  is received by Minnesota Mutual. Death  proceeds will be paid in a single
sum to  the beneficiary  designated by  the contract  owner, unless  an  annuity
option  is elected by  the beneficiary. Payment  will be made  within seven days
after we receive due proof of death and return of the contract. Except as  noted
below, the entire interest in the contract must be distributed within five years
of  the owner's death. If the annuitant  dies after annuity payments have begun,
Minnesota Mutual will pay to the  beneficiary any death benefit provided by  the
annuity  option selected. The person selected by the owner as the beneficiary of
any remaining interest after the death of the annuitant under the annuity option
may  be  a  person  different  from  that  person  designated  as  the  contract
beneficiary prior to the annuity commencement date.
  Certain  group accumulation annuity contracts have  been endorsed to provide a
death benefit which is different from that described above. For those contracts,
the death benefit payable to the beneficiary on the death of a participant prior
to the  annuity  commencement  date  shall  be  determined  separately  for  the
participant's  general  account and  separate  account accumulation  values. For
general account  accumulation values,  the death  benefit shall  be the  general
account  accumulation value. For separate account accumulation values, the death
benefit shall be equal to  the greater of: (1)  the amount of the  participant's
separate  account accumulation  value payable  at death; or  (2) the  sum of all
purchase payments  applied  to  the  separate  account by  or  on  behalf  of  a
participant,  plus  transfers  to  the separate  account,  less  all participant
withdrawals and transfers from that value.  As a matter of company practice,  we
use   this  method  except  that  total   purchase  payments  will  include  all
contributions, even those made  after 12 months to  determine the death  benefit
for all contracts offered by this Prospectus.
  The  beneficiary  will  be  the  person  or  persons  named  in  the  contract
application unless  the  owner subsequently  changes  the beneficiary.  In  that
event,  we will pay the amount payable at death to the beneficiary named in your
last change of beneficiary  request. The owner's written  request to change  the
beneficiary  will not  be effective until  it is recorded  in Minnesota Mutual's
home office records. After it has been  recorded, it will take effect as of  the
date the owner signed the request. However, if the
 
20
<PAGE>
annuitant  or the owner dies  before the request has  been recorded, the request
will not be effective as to those death proceeds we have paid before the request
was recorded in our home office records.
 
- ------------------------------------------------------------------------------
CREDITING ACCUMULATION UNITS
 
During the accumulation  period--the period before  the commencement of  annuity
payments--the  purchase  payment  (on  receipt  of  a  completed  application or
subsequently) is  credited  on  the  valuation  date  coincident  with  or  next
following  the date such  purchase payment is received.  If the initial purchase
payment is accompanied by an  incomplete application, the purchase payment  will
not  be credited until the valuation date  coincident with or next following the
date a completed application is received. Minnesota Mutual will offer to  return
the  initial  purchase  payment  accompanying an  incomplete  application  if it
appears that  the application  cannot be  completed within  five business  days.
Purchase  payments will be credited to the  contract in the form of accumulation
units. The number of accumulation units  credited with respect to each  purchase
payment  is determined by dividing the portion of the purchase payment allocated
to each sub-account by  the then current accumulation  unit value for that  sub-
account.  The  total  of  these  separate  account  accumulation  values  in the
sub-accounts will be the separate  account accumulation value. Interests in  the
sub-accounts will be valued separately.
  The  number of accumulation  units so determined  shall not be  changed by any
subsequent change in  the value of  an accumulation  unit, but the  value of  an
accumulation unit will vary from valuation date to valuation date to reflect the
investment experience of the Portfolios of the Series Fund.
  Minnesota Mutual will determine the value of accumulation units on each day on
which  the Portfolios of the Series Fund are  valued. The net asset value of the
Series Fund's shares shall  be computed once  daily, and, in  the case of  Money
Market Portfolio, after the declaration of the daily dividend, as of the primary
closing  time for business on the New York Stock Exchange (as of the date hereof
the primary close of trading is 3:00  p.m. (Central Time), but this time may  be
changed) on each day, Monday through Friday, except (i) days on which changes in
the  value of such Series Fund's portfolio securities will not materially affect
the current net asset value of such Series Fund's shares, (ii) days during which
no such  Series  Fund's shares  are  tendered for  redemption  and no  order  to
purchase  or sell such Series Fund's shares  is received by such Series Fund and
(iii) customary national business holidays on which the New York Stock  Exchange
is  closed for trading (as of the  date hereof, New Year's Day, Presidents' Day,
Good Friday, Memorial  Day, Independence  Day, Labor Day,  Thanksgiving Day  and
Christmas Day).
  Accordingly,  the value  of accumulation units  will be  determined daily, and
such determinations  will be  applicable to  all purchase  payments received  by
Minnesota  Mutual at its home office on that  day prior to the close of business
of the Exchange. The value of accumulation units applicable to purchase payments
received subsequent to the close of business of the Exchange on that day will be
the value determined as of the close of business on the next day the Exchange is
open for trading.
  In determining the value of the Series Fund on a valuation date, each security
traded on a  national securities exchange  is valued at  the last reported  sale
price  on that date, as of the close  of trading on the New York Stock Exchange.
If there has been no sale on such  day, then the security is valued at the  last
reported  bid  price  on that  day.  Any  security not  traded  on  a securities
exchange, but  traded in  the over-the-counter  market, is  valued at  the  last
quoted bid price. Any securities or other assets for which market quotations are
not  readily available  are valued  at fair market  value as  determined in good
faith by the Series Fund Board of Directors.
  In addition  to providing  for  the allocation  of  purchase payments  to  the
sub-accounts  of the Variable Fund D,  the contracts also provide for allocation
of purchase payments to Minnesota Mutual's General Account for accumulation at a
guaranteed  interest  rate.  Purchase   payments  received  without   allocation
instructions will be allocated to the General Account.
 
TRANSFER OF VALUES
Upon  your written request, values under the contract may be transferred between
the General Account and  the Variable Fund  D or among  the sub-accounts of  the
Variable  Fund D. We  will make the  transfer on the  basis of accumulation unit
values on  the valuation  date coincident  with  or next  following the  day  we
receive the request at our home office. No
 
                                                                              21
<PAGE>
deferred  sales charge  will be imposed  on such transfers.  While the contracts
currently provide that transfer amounts must be of an amount not less than  $250
we are waiving this restriction and allowing transfers of any amount.
  The  contracts permit us to  limit the frequency and  amount of transfers from
the General Account to  the Variable Fund D  sub-accounts. Currently, except  as
provided  below, we limit  such transfers to  a single such  transfer during any
calendar year and to any amount which is no more than 20% of the General Account
accumulation value at  the time of  the transfer. No  transfers will be  allowed
after annuity payments have begun.
  There  is a situation which is an  exception to the above restriction. This is
where the contract owner has established a systematic transfer arrangement  with
us. The contract owner may transfer General Account current interest earnings or
a specified amount from the General Account on a monthly, quarterly, semi-annual
or  annual basis. For transfers  of a specified amount  from the General Account
the maximum initial amount  that may be  transferred may not  exceed 10% of  the
current  General Account accumulation  value at the time  of the first transfer.
For contracts where the General  Account accumulation value is increased  during
the  year because of  transfers into the General  Account or additional purchase
payments, made  after  the  program is  established,  systematic  transfers  are
allowed  to the extent of  the greater of the current  transfer amount or 10% of
the then  current  General Account  accumulation  value. Even  with  respect  to
systematic  transfer plans,  we reserve  the right  to alter  the terms  of such
programs once established where funds are  being transferred out of the  General
Account.  Our  alteration  of  existing  systematic  transfer  programs  will be
effective only upon our written notice  to contract owners of changes  affecting
their election.
  Transfer  arrangements may be established to begin  on the 10th or 20th of any
month and  if a  transfer  cannot be  completed  it will  be  made on  the  next
available transfer date. In the absence of specific instructions, transfers will
be  made on a monthly basis and will remain active until the appropriate General
Account accumulation value or sub-account is depleted.
  Also, you or persons authorized  by you may effect  transfers, or a change  in
the  allocation of future premiums, by means  of a telephone call. Transfers and
requests made pursuant to  such a call  are subject to  the same conditions  and
procedures  as are outlined above for  written transfer requests. During periods
of marked economic or market changes, contract owners may experience  difficulty
in  implementing a telephone transfer due to  a heavy volume of telephone calls.
In such a  circumstance, contract  owners should consider  submitting a  written
transfer  request while continuing  to attempt a  telephone transfer. We reserve
the  right  to  restrict  the  frequency  of--or  otherwise  modify,  condition,
terminate  or  impose  charges  upon--telephone  transfer  privileges.  For more
information on telephone transfers, contact Minnesota Mutual.
  While for some contract owners we have used a form to pre-authorize  telephone
transactions,  we now make this service  automatically available to all contract
owners.  We  will  employ  reasonable  procedures  to  satisfy  ourselves   that
instructions  received from contract owners are  genuine and, to the extent that
we do not, we  may be liable  for any losses due  to unauthorized or  fraudulent
instructions.  We  require  contract  owners  to  identify  themselves  in those
telephone conversations through  contract numbers, social  security numbers  and
such  other information  as we  may deem to  be reasonable.  We record telephone
transfer instruction conversations  and we  provide the contract  owners with  a
written confirmation of the telephone transfer.
  The  interests  of contract  owners arising  from  the allocation  of purchase
payments or the transfer of contract  values to the general assets of  Minnesota
Mutual are not registered under the Securities Act of 1933, and Minnesota Mutual
is  not registered as an investment company  under the Investment Company Act of
1940. Accordingly, such interests  and Minnesota Mutual are  not subject to  the
provisions  of those acts that would apply  if registration under such acts were
required.
 
VALUE OF THE CONTRACT
The value of  the contract  at any  time prior  to the  commencement of  annuity
payments can be determined by multiplying the total number of accumulation units
credited  to the contract by the current value of an accumulation unit. There is
no assurance that such  value will equal or  exceed the purchase payments  made.
The  contract  owner and,  where applicable,  each  participant will  be advised
periodically of the number of accumulation units credited to the contract or  to
the participant's individual account, the current value of an accumulation unit,
and the total value of the contract or the individual account.
 
22
<PAGE>
ACCUMULATION UNIT VALUE
The  value of an accumulation  unit was set at  $1.000000 on the first valuation
date of the Variable Fund D. The value of an accumulation unit on any subsequent
valuation date is determined by multiplying the value of an accumulation unit on
the immediately preceding valuation date by the net investment factor (described
below) for the valuation period just ended. The value of an accumulation unit as
of any date  other than  a valuation  date is  equal to  its value  on the  next
succeeding valuation date.
 
NET INVESTMENT FACTOR
The  separate account net investment factor describes the investment performance
of a sub-account of  Variable Fund D.  It is for the  period from one  valuation
period  to the next. For  any such sub-account, the  net investment factor for a
valuation period  is the  gross investment  rate for  such sub-account  for  the
valuation  period less a deduction for the  mortality and expense risk charge at
the rate of .795%. The net investment factor for each sub-account other than the
sub-account holding shares of the Growth Portfolio of the Series Fund, shall  be
increased  by Minnesota Mutual.  It will be  increased to the  extent that on an
annual basis the investment advisory fee  accrued by the Portfolio in which  the
sub-account  invests, as a percentage of the  value of the average net assets of
such Portfolio, exceeds .265% per annum. The net investment factor for the  sub-
account  holding shares of the Growth Portfolio of the Series Fund shall also be
adjusted by Minnesota Mutual. It will be adjusted so that on an annual basis the
expenses, including  the  investment  advisory  fee, of  that  Portfolio,  as  a
percentage  of the average net assets of such Portfolio, exceed .265% per annum.
For purposes of this computation, "expenses" shall be determined on the basis of
generally accepted  accounting principles  applicable to  registered  investment
companies.  However, they  shall exclude  any expenses  of the  Growth Portfolio
which are  reimbursed by  Minnesota Mutual  or any  other person,  any  interest
expense or amortization of debt discount or any income tax expense.
  The  gross investment rate is equal to: (1) the net asset value per share of a
fund share held in a sub-account of  the separate account determined at the  end
of  the current valuation period; plus (2)  the per share amount of any dividend
or capital  gain distribution  by such  fund if  the "ex-dividend"  date  occurs
during  the current  valuation period;  divided by (3)  the net  asset value per
share of  that fund  share determined  at  the end  of the  preceding  valuation
period. The gross investment rate may be positive or negative.
 
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WITHDRAWALS AND SURRENDER
 
Under certain circumstances a contract owner may have the right to surrender his
or  her  contract  in  whole  or  in  part,  subject  to  possible  adverse  tax
consequences. (See  discussion  under  heading "Federal  Tax  Status"  on  pages
25-28.)
  The  Individual Accumulation Annuity Contract provides  that at any time prior
to the  death  of the  participant  and prior  to  the commencement  of  annuity
payments,  the contract owner may elect to surrender the contract and receive in
a single sum the  value of the participant's  individual account computed as  of
the  valuation date coincident with or next following the date of surrender. The
contract also provides for partial withdrawal of the value of the  participant's
individual  account, in amounts of at least  $250. All such payments are subject
to any limitations contained in  an applicable qualified trust  or plan or in  a
state deferred compensation plan.
  The  Group  Accumulation Annuity  Contract provides  that upon  termination of
purchase payments for  an individual  participant prior to  the commencement  of
annuity  payments, the participant  shall have a  vested interest in  his or her
individual account to the extent specified in the plan. If purchase payments are
discontinued for all  participants under  the contract,  each participant  shall
have  a vested  interest in his  or her  individual account as  specified in the
plan. The  contract  provides  that  the vested  portion  of  the  participant's
individual  account may be surrendered, in which event Minnesota Mutual will pay
to the participant in a single sum the value of such vested portion, computed as
of the valuation date coincident with  or next following the date of  surrender.
The  contract also provides  for partial withdrawal  of the value  of the vested
portion of a  participant's individual  account, in  amounts of  at least  $250.
However,  the  provisions  of  the applicable  qualified  trust,  plan  or state
deferred compensation plan may limit the right of the participant to elect  such
payments.
 
                                                                              23
<PAGE>
  The  Group  Deposit Administration  Contract does  not provide  for individual
allocation of  purchase  payments  or maintenance  of  individual  accounts  for
participants.  The dollar amount of any payment  made on behalf of a participant
by reason of his or her  individual termination of employment or termination  of
participation  in  the  plan  shall  be  determined  by  the  provisions  of the
applicable qualified trust or plan, and is not dependent upon the provisions  of
the  contract. If discontinuance of purchase payments for all participants under
such a  contract  occurs, and  the  accumulated value  of  the contract  is  not
transferred  to another funding vehicle, the participants  in the plan as of the
date of discontinuance  shall receive  a 100%  vested interest  in all  benefits
earned  under the terms  of the plan  to the extent  provided by the accumulated
value of the  contract. Such  accumulated value  may be  transferred to  another
funding  vehicle if, prior  to the date of  discontinuance of purchase payments,
the contract owner gives written notice to Minnesota Mutual certifying that  the
plan  is to be continued as a qualified  plan and requesting such transfer to be
made. The transfer date shall be the first valuation date to occur following the
effective  date  of  discontinuance  of   purchase  payments.  Payment  of   the
accumulated value of the contract which is a part of the Variable Fund D will be
made in a single sum as of the transfer date.
  We  will waive the applicable dollar  amount limitation on withdrawals where a
systematic withdrawal program is  in place and such  a smaller amount  satisfies
the minimum distribution requirements of the Code.
  Under  any contract,  once annuity payments  have commenced  for a participant
under Options 1, 2 or  3 of the optional  annuity forms, the participant  cannot
surrender his or her annuity benefit and receive a single sum settlement in lieu
thereof.  For a  discussion of  commutation rights  of payees  and beneficiaries
subsequent to  the  annuity commencement  date,  see heading  "Optional  Annuity
Forms" on page 18.
  Contract  owners may also submit their  signed written withdrawal or surrender
requests to  us  by  facsimile  (FAX) transmission.  Our  FAX  number  is  (612)
665-7942,  ATTN: U of  M Plan Services.  Transfer instructions or  changes as to
future allocations of  premium payments may  be communicated to  us by the  same
means.
  The surrender of a contract or a partial withdrawal thereunder may result in a
credit  against  Minnesota  Mutual's  premium  tax  liability.  In  such  event,
Minnesota Mutual will pay in addition to the cash value paid in connection  with
the  surrender or withdrawal,  the lesser of  (1) the amount  by which Minnesota
Mutual's premium tax liability is reduced, or (2) the amount previously deducted
from purchase payments  for premium taxes.  No representation can  be made  that
upon  any such  surrender or  withdrawal any  such payment  will be  made, since
applicable  tax  laws  at  the  time   of  surrender  or  withdrawal  would   be
determinative.
 
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DISTRIBUTION
 
The  contracts will be  sold by Minnesota  Mutual life insurance  agents who are
also  registered   representatives  of   MIMLIC  Sales   Corporation  or   other
broker-dealers  who  have  entered  into selling  agreements  with  MIMLIC Sales
Corporation. MIMLIC Sales Corporation acts  as the principal underwriter of  the
contracts. MIMLIC Sales Corporation is a wholly-owned subsidiary of MIMLIC Asset
Management  Company, which  in turn  is a  wholly-owned subsidiary  of Minnesota
Mutual. MIMLIC Asset Management Company is also the sole owner of the shares  of
Advantus  Capital Management, Inc., the investment  adviser for the Series Fund.
MIMLIC Sales Corporation is registered  as a broker-dealer under the  Securities
Exchange  Act of 1934 and is a  member of the National Association of Securities
Dealers, Inc.
  Commissions to dealers, paid in connection with the sale of the contracts, may
not exceed an amount which is equal  to 3.75% of the purchase payments  received
for  the Individual Accumulation  Annuity. Commissions on  group cases may vary,
but will not exceed that amount shown above.
  In addition, MIMLIC  Sales Corporation  or Minnesota Mutual  will pay  credits
which allow registered representatives (Agents) who are responsible for sales of
the  contracts to attend  conventions and other  meetings sponsored by Minnesota
Mutual or its  affiliates for  the purpose of  promoting the  sale of  insurance
and/or  investment products offered by Minnesota Mutual and its affiliates. Such
credits  may  cover  the   registered  representatives'  transportation,   hotel
accommodations, meals, registration fees and the like. Minnesota Mutual may also
pay registered representatives additional amounts
 
24
<PAGE>
based  upon their production  and the persistency of  life insurance and annuity
business placed with Minnesota Mutual.
 
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FEDERAL TAX STATUS
 
INTRODUCTION
The discussion contained herein is general in nature and is not intended as  tax
advice. Each person concerned should consult a competent tax adviser. No attempt
is  made to consider any  applicable state or other  tax laws. In addition, this
discussion is based on our understanding of federal income tax laws as they  are
currently  interpreted. No  representation is  made regarding  the likelihood of
continuation of current income  tax laws or the  current interpretations of  the
Internal Revenue Service.
  Minnesota  Mutual is  taxed as a  "life insurance company"  under the Internal
Revenue Code. The  operations of the  Variable Fund D  form a part  of, and  are
taxed  with, our other business activities.  Currently, no federal income tax is
payable by us on income dividends received by the Variable Fund D or on  capital
gains arising from the Variable Fund D's investment activities.
 
TAXATION OF ANNUITY CONTRACTS IN GENERAL
Section  72  of  the  Internal Revenue  Code  governs  taxation  of nonqualified
annuities in general and  some aspects of tax  qualified programs. No taxes  are
imposed  on  increases in  the value  of a  contract until  distribution occurs,
either in the form of a payment in a single sum or as annuity payments under the
annuity option elected.
  As a general rule, deferred annuity contracts held by a corporation, trust  or
other similar entity, as opposed to a natural person, are not treated as annuity
contracts  for federal tax purposes. The  investment income on such contracts is
taxed as  ordinary income  that  is received  or accrued  by  the owner  of  the
contract during the taxable year.
  For  payments made in the event of a full surrender of an annuity, the taxable
portion is generally  the amount  in excess of  the cost  basis (i.e.,  purchase
payments) of the contract. Amounts withdrawn from the variable annuity contracts
not  part of  a qualified  program are  treated first  as taxable  income to the
extent of the excess of the contract value over the purchase payments made under
the contract. Such taxable portion is taxed at ordinary income tax rates.
  In the case  of a  withdrawal under  an annuity that  is part  of a  qualified
program,  a portion of the amount received is  taxable based on the ratio of the
"investment in the contract" to the individual's balance in the retirement plan,
generally the value of the annuity.  The "investment in the contract"  generally
equals  the portion of any deposits made by  or on behalf of an individual under
an annuity which was not excluded from  the gross income of the individual.  For
annuities  issued in  connection with  qualified plans,  the "investment  in the
contract" can be zero.
  For annuity payments, the taxable portion is generally determined by a formula
that establishes the  ratio that the  cost basis  of the contract  bears to  the
expected  return  under the  contract. Such  taxable part  is taxed  at ordinary
income rates.
  If a taxable  distribution is  made under  the variable  annuity contracts,  a
penalty  tax of 10%  of the amount  of the taxable  distribution may apply. This
additional tax does  not apply  where the  taxpayer is  59 1/2  or older,  where
payment  is made on  account of the  taxpayer's disability, or  where payment is
made by reason of the death of the owner, and in certain other circumstances.
  The Code also provides  an exception to the  penalty tax for distributions  in
periodic payments, of substantially equal installments, be made for the life (or
life expectancy) of the taxpayer or the joint lives (or joint life expectancies)
of the taxpayer and beneficiary.
  For  some types of qualified  plans, other tax penalties  may apply to certain
distributions.
  A transfer of  ownership of  a contract, the  designation of  an annuitant  or
other  payee who is not also the contract owner, or the assignment of a contract
may result in certain income or gift tax consequences to the contract owner that
are beyond the scope of this  discussion. A contract owner who is  contemplating
any  such transfer,  designation or  assignment should  consult a  competent tax
adviser with respect to the potential tax effects of that transaction.
  For purposes of determining a contract owner's gross income, the Code provides
that all nonqualified deferred annuity contracts issued by the same company  (or
its  affiliates) to the  same contract owner  during any calendar  year shall be
treated as one annuity contract. Additional rules may be promulgated under  this
 
                                                                              25
<PAGE>
provision  to  prevent  avoidance  of its  effect  through  serial  purchases of
contracts or otherwise.  For further information  on these rules,  see your  tax
adviser.
 
DIVERSIFICATION REQUIREMENTS
Section  817(h)  of  the  Code  authorizes  the  Treasury  to  set  standards by
regulation or  otherwise  for the  investments  of the  Variable  Fund D  to  be
"adequately  diversified" in order for the contract  to be treated as an annuity
contract for Federal  tax purposes. Variable  Fund D, through  the Series  Fund,
intends   to  comply   with  the  diversification   requirements  prescribed  in
Regulations Section 1.817-5, which  affect how the Series  Fund's assets may  be
invested.  Although the investment adviser is  an affiliate of Minnesota Mutual,
Minnesota Mutual does not have control over the Series Fund or its  investments.
Nonetheless, Minnesota Mutual believes that each Portfolio of the Series Fund in
which  the Variable Fund D  owns shares will be  operated in compliance with the
requirements prescribed by the Treasury.
  In  certain  circumstances,  owners  of  variable  annuity  contracts  may  be
considered  the owners, for  federal income tax  purposes, of the  assets of the
separate account used to support their contracts. In those circumstances, income
and gains from the separate account  assets would be includable in the  variable
annuity  contract owner's gross income. The  IRS has stated in published rulings
that a variable contract owner will be considered the owner of separate  account
assets  if the contract owner possesses  incidents of ownership in those assets,
such as the ability to exercise investment control over the assets. The Treasury
Department has also announced,  in connection with  the issuance of  regulations
concerning  investment diversification,  that those regulations  "do not provide
guidance  concerning  the  circumstances  in  which  investor  control  of   the
investments  of a  segregated asset  account may  cause the  investor (i.e., the
contract owner), rather than the insurance  company, to be treated as the  owner
of the assets in the account." This announcement also states that guidance would
be issued by way of regulations or rulings on the "extent to which policyholders
may direct their investments to particular sub-accounts without being treated as
owners  of the underlying  assets." As of  the date of  this Prospectus, no such
guidance has been issued.
  The ownership  rights under  the contract  are similar  to, but  different  in
certain  respects from, those  described by the  IRS in rulings  in which it was
determined that contract owners were not owners of separate account assets.  For
example, the owner of a contract has the choice of several sub-accounts in which
to  allocate  net purchase  payments and  contract  values, and  may be  able to
transfer  among  sub-accounts  more  frequently  than  in  such  rulings.  These
differences  could result in a contract owner  being treated as the owner of the
assets of Variable  Fund D.  In addition, Minnesota  Mutual does  not know  what
standards  will be set  forth, if any,  in the regulations  or rulings which the
Treasury Department has stated it  expects to issue. Minnesota Mutual  therefore
reserves  the right to modify the contract  as necessary to attempt to prevent a
contract owner from being considered the owner of a pro rata share of the assets
of Variable Fund D.
 
REQUIRED DISTRIBUTIONS
In order to be treated as an  annuity contract for Federal income tax  purposes,
Section  72(s)  of  the Code  requires  any nonqualified  contract  issued after
January 18, 1985 to provide  that (a) if an owner  dies on or after the  annuity
starting date but prior to the time the entire interest in the contract has been
distributed, the remaining portion of such interest will be distributed at least
as rapidly as under the method of distribution being used as of the date of that
owner's  death; and (b) if an owner dies prior to the annuity starting date, the
entire interest in the contract must be distributed within five years after  the
date  of the owner's death. These  requirements shall be considered satisfied if
any portion of the owner's interest which is payable to or for the benefit of  a
"designated  beneficiary" is  distributed over the  life of  such beneficiary or
over a period not extending beyond  the life expectancy of that beneficiary  and
such  distributions begin  within one  year of  that owner's  death. The owner's
"designated beneficiary" is the person designated by such owner as a beneficiary
and to whom ownership of  the contract passes by reason  of death and must be  a
natural  person.  However,  if  the  owner's  "designated  beneficiary"  is  the
surviving spouse of the owner, the contract may be continued with the  surviving
spouse as the new owner.
  Nonqualified  contracts issued after January 18, 1985 contain provisions which
are intended  to comply  with the  requirements of  Section 72(s)  of the  Code,
although no
 
26
<PAGE>
regulations  interpreting  these requirements  have  yet been  issued. Minnesota
Mutual intends to review such provisions and modify them if necessary to  assure
that  they comply with the requirements of  Code Section 72(s) when clarified by
regulation or otherwise.
  Other rules may apply to qualified contracts.
 
TAXATION OF DEATH BENEFIT PROCEEDS
Amounts may be distributed from  a contract because of  the death of the  owner.
Generally,  such  amounts  are includable  in  the  income of  the  recipient as
follows: (1) if distributed in a lump sum, they are taxed in the same manner  as
a  full surrender  of the  contract, as described  above, or  (2) if distributed
under an annuity option, they are taxed in the same manner as annuity  payments,
as described above.
 
POSSIBLE CHANGES IN TAXATION
In  past years, legislation has been proposed that would have adversely modified
the federal taxation of certain annuities. For example, one such proposal  would
have  changed  the tax  treatment of  nonqualified annuities  that did  not have
"substantial life  contingencies" by  taxing income  as it  is credited  to  the
annuity.  Although as of  the date of  this Prospectus Congress  is not actively
considering any legislation regarding the taxation of annuities, there is always
the possibility that the tax treatment of annuities could change by  legislation
or  other means (such  as IRS regulations,  revenue rulings, judicial decisions,
etc.). Moreover, it is also possible that any change could be retroactive  (that
is, effective prior to the date of the change).
 
TAX QUALIFIED PROGRAMS
The  annuity is  designed for  use with several  types of  retirement plans that
qualify for special tax treatment. The tax rules applicable to participants  and
beneficiaries  in retirement plans  vary according to  the type of  plan and the
terms and  conditions  of the  plan.  Special  favorable tax  treatment  may  be
available  for  certain types  of contributions  and distributions.  Adverse tax
consequences may  result  from  contributions in  excess  of  specified  limits;
distributions prior to age 59 1/2 (subject to certain exceptions); distributions
that   do  not  conform  to  specified  minimum  distribution  rules;  aggregate
distributions in excess  of a specified  annual amount; and  in other  specified
circumstances.
  We  make no  attempt to  provide more  than general  information about  use of
annuities with the various  types of retirement  plans. Owners and  participants
under  retirement plans  as well as  annuitants and  beneficiaries are cautioned
that the  rights of  any person  to any  benefits under  annuities purchased  in
connection  with these plans may  be subject to the  terms and conditions of the
plans themselves, regardless of the terms  and conditions of the annuity  issued
in  connection with such a  plan. Some retirement plans  are subject to transfer
restrictions, distribution and other requirements that are not incorporated into
the annuity or our annuity  administration procedures. Owners, participants  and
beneficiaries  are responsible for determining that contributions, distributions
and other transactions with respect to the annuities comply with applicable law.
Purchasers of annuities for  use with any retirement  plan should consult  their
legal counsel and tax adviser regarding the suitability of the contract.
 
PUBLIC SCHOOL SYSTEMS AND CERTAIN TAX EXEMPT ORGANIZATIONS
Under  Code Section 403(b),  payments made by public  school systems and certain
tax exempt organizations to purchase  annuity contracts for their employees  are
excludable   from  the  gross  income  of   the  employee,  subject  to  certain
limitations. However, these payments  may be subject  to FICA (Social  Security)
taxes.
  Code  Section 403(b)(11) restricts the  distribution under Code Section 403(b)
annuity contracts of: (1) elective  contributions made in years beginning  after
December 31, 1988; (2) earnings on those contributions; and (3) earnings in such
years  on amounts  held as of  the last  year beginning before  January 1, 1989.
Distribution of  those  amounts may  only  occur  upon death  of  the  employee,
attainment  of age  59 1/2,  separation from  service, disability,  or financial
hardship. In addition, income attributable to elective contributions may not  be
distributed in the case of hardship.
 
INDIVIDUAL RETIREMENT ANNUITIES
Code Sections 219 and 408 permit individuals or their employers to contribute to
an  individual retirement program known as an "Individual Retirement Annuity" or
"IRA". Individual Retirement Annuities are subject to limitations on the  amount
which  may  be contributed  and  deducted and  the  time when  distributions may
commence. In  addition, distributions  from certain  other types  of  retirement
plans  may be  placed into  an Individual Retirement  Annuity on  a tax deferred
basis. Employers  may  establish Simplified  Employee  Pension (SEP)  Plans  for
making IRA contributions on behalf of their employees.
 
                                                                              27
<PAGE>
CORPORATE PENSION AND PROFIT-SHARING PLANS AND H.R. 10 PLANS
Code  Section 401(a) permits employers to  establish various types of retirement
plans  for  employees,  and  permits  self-employed  individuals  to   establish
retirement  plans for themselves and their employees. These retirement plans may
permit the purchase of the contracts to accumulate retirement savings under  the
plans.  Adverse tax or other legal consequences  to the plan, to the participant
or to  both  may result  if  this annuity  is  assigned or  transferred  to  any
individual as a means to provide benefit payments, unless the plan complies with
all  legal requirements  applicable to  such benefits  prior to  transfer of the
annuity.
 
DEFERRED COMPENSATION PLANS
Code Section 457 provides for  certain deferred compensation plans. These  plans
may be offered with respect to service for state governments, local governments,
political  subdivisions, agencies,  instrumentalities and  certain affiliates of
such entities, and tax exempt  organizations. The plans may permit  participants
to  specify the form of investment for their deferred compensation account. With
respect to non-governmental Section 457 plans, all investments are owned by  the
sponsoring  employer and are subject  to the claims of  the general creditors of
the employer and, depending  on the terms of  the particular plan, the  employer
may  be  entitled to  draw on  deferred  amounts for  purposes unrelated  to its
Section 457 plan obligations. In general,  all amounts received under a  Section
457 plan are taxable and are subject to federal income tax withholding as wages.
 
WITHHOLDING
In  general,  distributions from  annuities are  subject  to federal  income tax
withholding unless  the recipient  elects not  to have  tax withheld.  Different
rules  may apply  to payments delivered  outside the United  States. Some states
have enacted similar  rules. Recent changes  to the Code  allow the rollover  of
most  distributions  from  tax-qualified  plans  and  Section  403(b)  annuities
directly to other tax-qualified plans that will accept such distributions and to
individual   retirement   accounts   and   individual   retirement    annuities.
Distributions  which may not  be rolled over are  those which are:  (1) one of a
series of substantially equal annual (or  more frequent) payments made (a)  over
the  life  or life  expectancy of  the employee,  (b) the  joint lives  or joint
expectancies of the employee and  the employee's designated beneficiary, or  (c)
for   a  specified  period  of  ten  years  or  more;  (2)  a  required  minimum
distribution; or (3) the non-taxable portion of a distribution. Depending on the
terms of the particular plan, the employer  may be entitled to draw on  deferred
amounts  for purposes unrelated to its Section 457 plan obligations. In general,
all amounts received under  a Section 457  plan are taxable  and are subject  to
federal income tax withholding as wages.
  Any  distribution  eligible  for rollover,  which  may include  payment  to an
employee, an employee's  surviving spouse or  an ex-spouse who  is an  alternate
payee,  will be  subject to  federal tax  withholding at  a 20%  rate unless the
distribution is made  as a  direct rollover  to a  tax-qualified plan  or to  an
individual  retirement account or annuity. It may be noted that amounts received
by individuals which are  eligible for rollover may  still be placed in  another
tax-qualified  plan or  individual retirement  account or  individual retirement
annuity if the transaction is completed within sixty days after the distribution
has been received.  Such a  taxpayer must  replace withheld  amounts with  other
funds to avoid taxation on the amount previously withheld.
 
SEE YOUR OWN TAX ADVISER
It should be understood that the foregoing description of the federal income tax
consequences  under these contracts is not exhaustive and that special rules are
provided with respect  to situations  not discussed  herein. It  should also  be
understood  that should  a plan lose  its qualified status,  employees will lose
some of the tax  benefits described. Statutory changes  in the Internal  Revenue
Code  with varying effective dates, and  regulations adopted thereunder may also
alter the tax consequences of specific factual situations. Due to the complexity
of the applicable laws, tax advice may  be needed by a person contemplating  the
purchase  of a  variable annuity contract  or exercising elections  under such a
contract. For further information a qualified tax adviser should be consulted.
 
28
<PAGE>
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LEGAL PROCEEDINGS
 
There are no pending legal proceedings in which the Variable Fund D is a  party.
There  are no  material pending legal  proceedings, other  than ordinary routine
litigation incidental  to  their business,  in  which Minnesota  Mutual,  MIMLIC
Management, Advantus Capital or MIMLIC Sales is a party.
 
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STATEMENT OF ADDITIONAL INFORMATION
A  Statement of Additional  Information, which contains  additional contract and
Variable Fund D  information including financial  statements, is available  from
the  offices of the Variable  Fund D at your request.  The Table of Contents for
that Statement of Additional Information is as follows:
 
    Variable Fund D
    Trustees and Principal Management Officers of Minnesota Mutual
    Other Contracts
    Distribution of Contracts
    Performance Data
    Annuity Payments
    Auditors
    Financial Statements
    Appendix A--Calculation of Unit Values
 
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