NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
497, 1999-05-17
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<PAGE>

[GRAPHIC]

PROSPECTUSES


April 30, 1999

NORTHWESTERN
MUTUAL LIFE-Registered Trademark-
The Quiet Company-Registered Trademark-


             Northwestern Mutual Variable CompLife-Registered Trademark-

                              Variable Whole Life Policy
                              with Additional Protection

This prospectus describes seven new investment divisions which we expect to be
available on June 30, 1999.  We have filed an amendment to the Policy form with
the insurance commissioner of your state to include these new divisions.  If you
own a Policy issued before the date when the new divisions become available in
your state, we will send you an amendment to your Policy soon after that date.
Please read the prospectus for more information.



CompLife-Registered Trademark- is a registered service mark of The Northwestern
Mutual Life Insurance Company.



Northwestern Mutual Series Fund, Inc. and Russell Insurance Funds

The Northwestern Mutual Life Insurance Company
720 East Wisconsin Avenue
Milwaukee, WI  53202
(414) 271-1444


<PAGE>
CONTENTS FOR THIS PROSPECTUS
<TABLE>
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                                                                            Page
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<S>                                                                         <C>
Prospectus................................................................    1
Summary...................................................................    2
  Variable Life Insurance.................................................    2
  The Account and its Divisions...........................................    2
  The Policy..............................................................    2
    Premiums..............................................................    2
    Death Benefit.........................................................    2
    Cash Value............................................................    2
    Deductions and Charges................................................    3
      From Premiums.......................................................    3
      From Policy Value...................................................    3
      From the Assets of the Account......................................    3
      Transaction Charges.................................................    3
      Surrender Charges...................................................    3
      From the Mutual Funds...............................................    3
The Northwestern Mutual Life Insurance Company,
  Northwestern Mutual Variable Life Account, Northwestern Mutual Series
   Fund, Inc. and Russell Insurance Funds.................................    5
  Northwestern Mutual Life................................................    5
  The Account.............................................................    5
  The Funds...............................................................    5
   Northwestern Mutual Series Fund, Inc...................................    5
    Small Cap Growth Stock Portfolio......................................    5
    Aggressive Growth Stock Portfolio.....................................    6
    International Equity Portfolio........................................    6
    Index 400 Stock Portfolio.............................................    6
    Growth Stock Portfolio................................................    6
    Growth and Income Stock Portfolio.....................................    6
    Index 500 Stock Portfolio.............................................    6
    Balanced Portfolio....................................................    6
    High Yield Bond Portfolio.............................................    6
    Select Bond Portfolio.................................................    6
    Money Market Portfolio................................................    6
   Russell Insurance Funds................................................    6
    Multi-Style Equity Fund...............................................    7
    Aggressive Equity Fund................................................    7
    Non-U.S. Fund.........................................................    7
    Real Estate Securities Fund...........................................    7
    Core Bond Fund........................................................    7
Detailed Information About the Policy.....................................    7
    The Policy Design.....................................................    7
    Requirements for Insurance............................................    8
    Premiums..............................................................    8
    Death Benefit.........................................................   10
    Policy Value and Paid-Up Additional Insurance.........................   11
    Allocations to the Account............................................   11
 
<CAPTION>
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<S>                                                                         <C>
  Deductions and Charges..................................................   12
    Deductions from Premiums..............................................   12
    Charges Against the Policy Value......................................   12
    Charges Against the Account Assets....................................   13
    Transaction Charges...................................................   13
    Surrender Charges.....................................................   13
  Guarantee of Premiums, Deductions and Charges...........................   14
    Cash Value............................................................   14
    Annual Dividends......................................................   14
    Loans and Withdrawals.................................................   15
    Excess Amount.........................................................   16
    Paid-Up Insurance.....................................................   16
    Reinstatement.........................................................   16
    Right to Return Policy................................................   17
    Right to Exchange for a Fixed Benefit Policy..........................   17
    Other Policy Provisions...............................................   17
      Owner...............................................................   17
      Beneficiary.........................................................   17
      Incontestability....................................................   17
      Suicide.............................................................   17
      Misstatement of Age or Sex..........................................   17
      Collateral Assignment...............................................   17
      Payment Plans.......................................................   17
      Deferral of Determination and Payment...............................   17
  Voting Rights...........................................................   18
  Substitution of Fund Shares and Other Changes...........................   18
  Reports.................................................................   18
  Special Policy for Employers............................................   18
  Distribution of the Policies............................................   19
  Tax Treatment of Policy Benefits........................................   19
Other Information.........................................................   20
  Management..............................................................   20
  Regulation..............................................................   21
  Year 2000 Issues........................................................   22
  Legal Proceedings.......................................................   22
  Registration Statement..................................................   22
  Experts.................................................................   22
Financial Statements......................................................   23
  Report of Independent Accountants (for the two years ended December 31,
   1998)..................................................................   23
  Financial Statements of the Account (for the two years ended December
   31, 1998)..............................................................   24
  Financial Statements of Northwestern Mutual Life (for the three years
   ended December 31, 1998)...............................................   30
  Report of Independent Accountants (for the three years ended December
   31, 1998)..............................................................   43
Appendix..................................................................   44
</TABLE>
<PAGE>
PROSPECTUS
 
NORTHWESTERN MUTUAL VARIABLE COMPLIFE-REGISTERED TRADEMARK-
 
VARIABLE WHOLE LIFE POLICY WITH ADDITIONAL PROTECTION This prospectus describes
the Variable CompLife-Registered Trademark- Policy (the "Policy") offered by The
Northwestern Mutual Life Insurance Company. We have designed the Policy to
provide lifetime insurance coverage on the insured named in the Policy. We use
Northwestern Mutual Variable Life Account (the "Account") to keep the money you
invest separate from our general assets. Both the death benefit and the cash
value provided by the Policy will vary daily to reflect the investment
experience of the Account.
 
You may allocate the net premiums to one or more of the sixteen divisions of the
Account. The assets of each division will be invested in a corresponding
Portfolio of Northwestern Mutual Series Fund, Inc. or one of the Russell
Insurance Funds. The prospectuses for these mutual funds, attached to this
prospectus, describe the investment objectives for all of the Portfolios and
Funds.
 
The Policy provides for a scheduled premium payable at least annually, but you
may pay more than the scheduled amount. In some situations you may pay less than
the scheduled amount. We guarantee that the death benefit will never be less
than the Policy's initial amount of whole life insurance, regardless of the
Account's investment experience, so long as you pay scheduled premiums when they
are due and no Policy debt is outstanding. The Policy may include insurance
which we guarantee for only a specified number of years. There is no guaranteed
minimum cash value.
 
In the early years of a Policy it is likely that the cash value will be less
than the premium amounts accumulated at interest. This is because of the sales
and insurance costs for a new Policy. We make deductions for sales costs and
administrative expenses from the cash values of Policies surrendered during the
early Policy years. Therefore you should purchase a Policy only if you intend to
keep it in force for a reasonably long period.
 
You may return a Policy for a full refund for a limited period of time. See
"Right to Return Policy", p.17.
 
IT MAY NOT BE ADVANTAGEOUS TO REPLACE EXISTING INSURANCE WITH A VARIABLE LIFE
INSURANCE POLICY. SEE DEDUCTIONS AND CHARGES AND CASH VALUE.
 
THIS PROSPECTUS IS VALID ONLY WHEN ACCOMPANIED BY THE CURRENT PROSPECTUSES FOR
NORTHWESTERN MUTUAL SERIES FUND, INC. AND THE RUSSELL INSURANCE FUNDS WHICH ARE
ATTACHED HERETO, AND SHOULD BE RETAINED FOR FUTURE REFERENCE.
 
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.
 
                                       --
                                       1
<PAGE>
SUMMARY
 
THE FOLLOWING SUMMARY PROVIDES A BRIEF OVERVIEW OF THE ACCOUNT AND THE POLICY.
IT OMITS DETAILS WHICH ARE INCLUDED ELSEWHERE IN THIS PROSPECTUS, IN THE
ATTACHED MUTUAL FUND PROSPECTUSES AND IN THE TERMS OF THE POLICY.
 
VARIABLE LIFE INSURANCE
 
Variable life insurance is cash value life insurance and is similar in many ways
to traditional fixed benefit life insurance. Variable life insurance allows the
policyowner to direct the premiums, after certain deductions, among a range of
investment options. The variable life insurance death benefit and cash value
vary daily to reflect the performance of the selected investments. Since a
substantial part of the premium pays for the insurance risk of death you should
not consider variable life insurance unless your primary need is life insurance
protection.
 
THE ACCOUNT AND ITS DIVISIONS
 
Northwestern Mutual Variable Life Account is the investment vehicle for the
Policies. The Account has sixteen divisions. You determine how net premiums are
to be apportioned. You may select up to ten divisions at any one point in time.
We invest the assets of each division in a corresponding Portfolio of
Northwestern Mutual Series Fund, Inc. or one of the Russell Insurance Funds. The
eleven Portfolios of Northwestern Mutual Series Fund, Inc. are the Small Cap
Growth Stock Portfolio, Aggressive Growth Stock Portfolio, International Equity
Portfolio, Index 400 Stock Portfolio, Growth Stock Portfolio, Growth and Income
Stock Portfolio, Index 500 Stock Portfolio, Balanced Portfolio, High Yield Bond
Portfolio, Select Bond Portfolio and Money Market Portfolio. The five Russell
Insurance Funds are the Multi-Style Equity Fund, Aggressive Equity Fund,
Non-U.S. Fund, Real Estate Securities Fund, and Core Bond Fund. For additional
information about the funds see the attached prospectuses.
 
THE POLICY
 
PREMIUMS  The Policy provides for a scheduled premium for the Minimum Guaranteed
Death Benefit and any Additional Protection you purchase as part of the Policy.
The Minimum Guaranteed Death Benefit is the initial amount of whole life
insurance provided by the Policy. Additional Protection is insurance which does
not have a lifetime guarantee, but we guarantee this insurance for a specified
period. The scheduled premium may include additional amounts to purchase
variable paid-up additional insurance or to increase Policy Value. The scheduled
premium also includes the amount required for any additional benefits that you
purchase with the Policy. You may pay optional unscheduled additional premiums,
within limits, to purchase variable paid-up additional insurance or to increase
Policy Value. You may suspend payment of premiums if we determine under a
certain set of assumptions that the Policy Value is already sufficient to cover
future insurance costs. You may have to resume payment of premiums in the future
if the Policy Value becomes insufficient. The Policy Value reflects investment
experience as well as premiums paid and the cost of insurance and other charges.
After a Policy is issued you may increase or decrease the amount of scheduled
premiums within limits. Premiums are payable at least annually.
 
DEATH BENEFIT  We guarantee that the Minimum Guaranteed Death Benefit provided
by a Policy will be paid upon the death of the insured, regardless of investment
experience, if you have paid scheduled premiums when they are due and no Policy
debt is outstanding. The death benefit will be increased by the amount of any
Additional Protection in force. We guarantee Additional Protection for a period
which depends on the sex and risk classification and age of the insured when the
Policy is issued and on the proportions of Minimum Guaranteed Death Benefit and
Additional Protection. The death benefit will also be increased by the amount of
any variable paid-up additional insurance, any excess Policy Value and any
amount needed to meet federal income tax requirements for life insurance.
 
CASH VALUE  The cash value of a Policy is not guaranteed and varies daily to
reflect investment experience. You may surrender a Policy for its cash value. A
surrender charge applies during the first 15 policy years. We permit partial
surrenders by administrative practice if the remaining Policy meets our minimum
size requirements.
 
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                                       2
<PAGE>
DEDUCTIONS AND CHARGES
 
FROM PREMIUMS
 
- - Deduction of 3.5% for state and federal taxes attributable to premiums
 
- - Sales load of 4.5%
 
- - Annual charge of $84, currently expected to be reduced to $60 after ten years
 
- - Annual charge of $0.12 per $1,000 of Minimum Guaranteed Death Benefit
 
- - Annual expense charge of $0.12 per $1,000 of Minimum Guaranteed Death Benefit
  and Additional Protection (currently expected to be charged for ten years
  only)
 
- - Any extra premium charged for insureds who do not qualify as select, standard
  plus or standard risks
 
- - Any extra premium for additional benefits purchased with the Policy
 
FROM POLICY VALUE
 
- - An annual charge, based on the amount at risk and the attained age and risk
  classification of the insured, with rates based on the 1980 CSO Mortality
  Tables. This charge also applies for the values which support any paid-up
  additional insurance.
 
- - Any surrender charges, administrative charges or decrease in Policy debt that
  may result from a partial withdrawal, a decrease in the face amount of
  insurance or a transfer of Policy Value to paid-up insurance
 
FROM THE ASSETS OF THE ACCOUNT
 
- - A daily charge at the annual rate of .60% of the Account assets for mortality
  and expense risks
 
TRANSACTION CHARGES
 
- - Fee of up to $25 (currently waived) for transfers among the Account Divisions
- - Fee of up to $25 (currently waived) for withdrawals of Excess Amount
- - Charge for administrative costs to process a partial surrender, currently
  expected to be $250
 
SURRENDER CHARGES
 
- - Surrender charges for sales and issuance expenses we deduct from Policy
  proceeds if you surrender the Policy during the first 15 years. See "Surrender
  Charges", p. 13.
 
FROM THE MUTUAL FUNDS
 
- - A daily charge for investment advisory and other services provided to the
  mutual funds. The total expenses vary by Portfolio or Fund and currently fall
  in an approximate range of .21% to 2.37% of assets on an annual basis.
 
The following table shows the annual expenses for each of the Portfolios and
Funds, as a percentage of their average net assets of the Portfolio, based on
1998 operations. Expenses for the Portfolios and Funds which were not in
operation during 1998 are estimated.
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
 
<TABLE>
<CAPTION>
                                INVESTMENT
                                 ADVISORY           OTHER           TOTAL
PORTFOLIO                          FEE            EXPENSES         EXPENSES
- ---------------------------  ----------------  ---------------  --------------
<S>                          <C>               <C>              <C>
Small Cap Growth Stock*....           .80%             .46%            1.26%
Aggressive Growth Stock....           .52%             .00%             .52%
International Equity.......           .67%             .09%             .76%
Index 400 Stock*...........           .25%             .23%             .48%
Growth Stock...............           .45%             .01%             .46%
Growth and Income Stock....           .57%             .01%             .58%
Index 500 Stock............           .20%             .01%             .21%
Balanced...................           .30%             .00%             .30%
High Yield Bond............           .49%             .01%             .50%
Select Bond................           .30%             .00%             .30%
Money Market...............           .30%             .00%             .30%
</TABLE>
 
*Small Cap Growth Stock and Index 400 Stock Portfolios  Northwestern Mutual
Investment Services, LLC (NMIS), investment adviser to Northwestern Mutual
Series Fund, Inc., has voluntarily agreed to waive a portion of its advisory
fee, up to the full amount of that fee, equal to the amount by which total
operating expenses exceed (1) 0.92% of the Small Cap Growth Stock Portfolio's
average daily net assets on an annual basis, and (2) 0.35% of the Index 400
Stock Portfolio's average daily net assets. In addition, NMIS has voluntarily
agreed to reimburse each of these portfolios for all remaining expenses after
fee waivers which exceed (1) 0.92% in the case of the Small Cap Growth Stock
Portfolio, and (2) 0.35% in the case of the Index 400 Stock Portfolio, of the
average daily net assets on an annual basis. This waiver and reimbursement, in
each case, may be revised or eliminated at any time without notice to
shareholders. Operating expenses are based on average net assets expected to be
invested during the period ending on December 31, 1999. During the course of
this period, expenses may be more or less than the amounts shown.
 
                            RUSSELL INSURANCE FUNDS
 
<TABLE>
<CAPTION>
                              INVESTMENT
                               ADVISORY           OTHER           TOTAL
FUND                             FEE*           EXPENSES*        EXPENSES
- --------------------------  ---------------  ---------------  --------------
<S>                         <C>              <C>              <C>
Multi-Style Equity Fund...         0.78%            0.43%            1.21%
Aggressive Equity Fund....         0.95%            0.72%            1.67%
Non-U.S. Fund.............         0.95%            1.42%            2.37%
Real Estate Securities
 Fund.....................         0.85%            0.30%            1.15%
Core Bond Fund............         0.60%            0.68%            1.28%
</TABLE>
 
*Multi-Style Equity Fund  Frank Russell Investment Company's (FRIC's) advisor,
Frank Russell Investment Management Company (FRIMCo) has voluntarily agreed to
waive a portion of its 0.78% management fee, up to the full amount of that fee,
equal to the amount by which the Fund's total operating expenses exceed 0.92%
 
                                       --
                                       3
<PAGE>
of the Fund's average daily net assets on an annual basis. FRIMCo has
voluntarily agreed to reimburse the Fund for all remaining expenses after fee
waivers which exceed 0.92% of the average daily net assets on an annual basis.
This waiver may be revised or eliminated at any time without notice to
shareholders. Taking the fee waivers into account, the actual annual total
operating expenses were 0.92% of the average net assets of the Multi-Style Fund.
 
Aggressive Equity Fund  FRIMCo has voluntarily agreed to waive a portion of its
0.95% management fee, up to the full amount of that fee, equal to the amount by
which the Fund's total operating expenses exceed 1.25% of the Fund's average
daily net assets on an annual basis. FRIMCo has voluntarily agreed to reimburse
the Fund for all remaining expenses after fee waivers which exceed 1.25% of the
average daily net assets on an annual basis. This waiver may be revised or
eliminated at any time without notice to shareholders. Taking the fee waivers
into account, the actual annual total operating expenses were 1.25% of the
average net assets of the Aggressive Equity Fund.
 
Non-U.S. Fund  FRIMCo has voluntarily agreed to waive a portion of its 0.95%
management fee, up to the full amount of that fee, equal to the amount by which
the Fund's total operating expenses exceed 1.30% of the Fund's average daily net
assets on an annual basis. FRIMCo has voluntarily agreed to reimburse the Fund
for all remaining expenses after fee waivers which exceed 1.30% of the average
daily net assets on an annual basis. This waiver may be revised or eliminated at
any time without notice to shareholders. Taking the fee waivers into account,
the actual annual total operating expenses were 1.30% of the average net assets
of the Non-U.S. Fund.
 
Real Estate Securities Fund  FRIMCo has voluntarily agreed to waive a portion of
its .85% management fee, up to the full amount of that fee, equal to the amount
by which the Fund's total operating expenses exceed 1.15% of the Fund's average
daily net assets on an annual basis. FRIMCo has voluntarily agreed to reimburse
the Fund for all remaining expenses after fee waivers which exceed 1.15% of the
average daily net assets on an annual basis. This waiver may be revised or
eliminated at any time without notice to shareholders. Operating expenses are
based on average net assets expected to be invested during the year ending
December 31, 1999. During the course of this period, expenses may be more or
less than the amount shown.
 
Core Bond Fund  FRIMCo has voluntarily agreed to waive a portion of its 0.60%
management fee, up to the full amount of that fee, equal to the amount by which
the Fund's total operating expenses exceed .80% of the Fund's average daily net
assets on an annual basis. FRIMCo has voluntarily agreed to reimburse the Fund
for all remaining expenses after fee waivers which exceed .80% of the average
daily net assets on an annual basis. This waiver may be revised or eliminated at
any time without notice to shareholders. Taking the fee waivers into account,
the actual annual total operating expenses were .80% of the average net assets
of the Core Bond Fund.
 
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                                       4
<PAGE>
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY,
NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT,
NORTHWESTERN MUTUAL SERIES FUND, INC. AND
RUSSELL INSURANCE FUNDS
 
NORTHWESTERN MUTUAL LIFE
The Northwestern Mutual Life Insurance Company is a mutual life insurance
company organized by a special act of the Wisconsin Legislature in 1857. It is
the nation's fourth largest life insurance company, based on total assets in
excess of $77 billion on December 31, 1998 and is licensed to conduct a
conventional life insurance business in the District of Columbia and in all
states of the United States. Northwestern Mutual Life sells life and disability
insurance policies and annuity contracts through its own field force of
approximately 6,000 full time producing agents. The Internal Revenue Service
Employer Identification Number of Northwestern Mutual Life is 39-0509570.
 
"We" in this prospectus means Northwestern Mutual Life.
 
THE ACCOUNT
 
We established Northwestern Mutual Variable Life Account by action of our
Trustees on November 23, 1983, in accordance with the provisions of Wisconsin
insurance law. Under Wisconsin law the income, gains and losses, realized or
unrealized, of the Account are credited to or charged against the assets of the
Account without regard to our other income, gains or losses. We use the Account
only for variable life insurance policies. However, the policies issued prior to
the introduction of Variable CompLife-Registered Trademark- (October 11, 1995 in
most states) are different from the Variable CompLife-Registered Trademark-
Policies described in this prospectus. The older policies are described in a
separate prospectus and are no longer offered. We also use the Account for other
variable life insurance policies which are described in other prospectuses.
 
The Account is registered with the Securities and Exchange Commission as a unit
investment trust under the Investment Company Act of 1940. This registration
does not involve supervision of management or investment practices or policies.
The Account has sixteen divisions. All of the assets of each division are
invested in shares of the corresponding Portfolio or Fund described below.
 
THE FUNDS
 
NORTHWESTERN MUTUAL SERIES FUND, INC.
 
Northwestern Mutual Series Fund, Inc. is a mutual fund of the series type
registered under the Investment Company Act of 1940 as an open-end diversified
management investment company. The Account buys shares of each Portfolio at
their net asset value without any sales charge.
 
The investment adviser for the Fund is Northwestern Mutual Investment Services,
LLC ("NMIS"), our wholly-owned subsidiary. The investment advisory agreements
for the respective Portfolios provide that NMIS will provide services and bear
certain expenses of the Fund. For providing investment advisory and other
services and bearing Fund expenses, the Fund pays NMIS a fee at an annual rate
which ranges from .20% of the aggregate average daily net assets of the Index
500 Stock Portfolio to a maximum of .67% for the International Equity Portfolio,
based on 1998 asset size. Other expenses borne by the Portfolios range from 0%
for the Select Bond, Money Market and Balanced Portfolios to .09% for the
International Equity Portfolio. We provide the people and facilities NMIS uses
in performing its investment advisory functions and we are a party to the
investment advisory agreement. NMIS has retained J.P. Morgan Investment
Management, Inc. and Templeton Investment Counsel, Inc. under investment
sub-advisory agreements to provide investment advice to the Growth and Income
Stock Portfolio and the International Equity Portfolio.
 
The investment objectives and types of investments for each of the eleven
Portfolios of the Fund are set forth below. There can be no assurance that the
Portfolios will realize their objectives. For more information about the
investment objectives and policies, the attendant risk factors and expenses see
the attached prospectus for Northwestern Mutual Series Fund, Inc.
 
SMALL CAP GROWTH STOCK PORTFOLIO.  The investment objective of the Small Cap
Growth Stock Portfolio is long-term growth of capital. The Portfolio will seek
to achieve this objective primarily by investing in the common stocks of
companies which can reasonably be
 
                                       --
                                       5
<PAGE>
expected to increase sales and earnings at a pace which will exceed the growth
rate of the U.S. economy over an extended period. WE EXPECT THE SMALL CAP GROWTH
STOCK PORTFOLIO TO BE AVAILABLE FOR USE WITH THE POLICIES BEGINNING ON JUNE 30,
1999.
 
AGGRESSIVE GROWTH STOCK PORTFOLIO.  The investment objective of the Aggressive
Growth Stock Portfolio is to achieve long-term appreciation of capital primarily
by investing in the common stocks of companies which can reasonably be expected
to increase their sales and earnings at a pace which will exceed the growth rate
of the nation's economy over an extended period.
 
INTERNATIONAL EQUITY PORTFOLIO.  The investment objective of the International
Equity Portfolio is long-term capital growth. It pursues its objective through a
flexible policy of investing in stocks and debt securities of companies and
governments outside the United States.
 
INDEX 400 STOCK PORTFOLIO.  The investment objective of the Index 400 Stock
Portfolio is to achieve investment results that approximate the performance of
the Standard & Poor's MidCap 400 Index ("S&P 400 Index"). The Portfolio will
attempt to meet this objective by investing in stocks included in the S&P 400
Index. WE EXPECT THE INDEX 400 STOCK PORTFOLIO TO BE AVAILABLE FOR USE WITH THE
POLICIES BEGINNING ON JUNE 30, 1999.
 
GROWTH STOCK PORTFOLIO.  The investment objective of the Growth Stock Portfolio
is long-term growth of capital; current income is secondary. The Portfolio will
seek to achieve this objective by selecting investments in companies which have
above average earnings growth potential.
GROWTH AND INCOME STOCK PORTFOLIO.  The investment objective of the Growth and
Income Stock Portfolio is long-term growth of capital and income. Ordinarily the
Portfolio pursues its investment objectives by investing primarily in
dividend-paying common stock.
 
INDEX 500 STOCK PORTFOLIO.  The investment objective of the Index 500 Stock
Portfolio is to achieve investment results that approximate the performance of
the Standard & Poor's 500 Composite Stock Price Index ("S&P 500 Index"). The
Portfolio will attempt to meet this objective by investing in stocks included in
the S&P 500 Index. Stocks are generally more volatile than debt securities and
involve greater investment risks.
 
BALANCED PORTFOLIO.  The investment objective of the Balanced Portfolio is to
realize as high a level of long-term total rate of return as is consistent with
prudent investment risk. The Balanced Portfolio will invest in common stocks and
other equity securities, bonds and money market instruments. Investment in the
Balanced Portfolio necessarily involves the risks inherent in stocks and debt
securities of varying maturities, including the risk that the Portfolio may
invest too much or too little of its assets in each type of security at any
particular time.
 
HIGH YIELD BOND PORTFOLIO.  The investment objective of the High Yield Bond
Portfolio is to achieve high current income and capital appreciation by
investing primarily in fixed income securities that are rated below investment
grade by the major rating agencies.
 
SELECT BOND PORTFOLIO.  The primary investment objective of the Select Bond
Portfolio is to provide 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 shareholders' capital. The Select Bond Portfolio will invest
primarily in debt securities. The value of debt securities will tend to rise and
fall inversely with the rise and fall of interest rates.
 
MONEY MARKET PORTFOLIO.  The investment objective of the Money Market Portfolio
is to realize maximum current income consistent with liquidity and stability of
capital. The Money Market Portfolio will invest in money market instruments and
other debt securities with maturities generally not exceeding one year. The
return produced by these securities will reflect fluctuations in short-term
interest rates.
 
RUSSELL INSURANCE FUNDS
 
The Russell Insurance Funds also comprise a mutual fund of the series type
registered under the Investment Company Act of 1940 as an open-end diversified
management investment company. The Account buys shares of each of the Russell
Insurance Funds at their net asset value without any sales charge.
 
The assets of each of the Russell Insurance Funds are invested by one or more
investment management organizations researched and recommended by Frank Russell
Company ("Russell"), and an affiliate of Russell, Frank Russell Investment
Management Company ("FRIMCo"). FRIMCo also advises, operates and
 
                                       --
                                       6
<PAGE>
administers the Russell Insurance Funds. Russell is our majority-owned
subsidiary.
 
The investment objectives and types of investments for each of the five Russell
Insurance Funds are set forth below. There can be no assurance that the Funds
will realize their objectives. A table showing the expense ratios for each of
the Russell Insurance Funds is included in the Summary above, at page 3. For
more information about the investment objectives and policies, the attendant
risk factors and expenses see the attached prospectus for the Russell Insurance
Funds. WE EXPECT THE RUSSELL INSURANCE FUNDS TO BE AVAILABLE FOR USE WITH THE
POLICIES BEGINNING ON JUNE 30, 1999.
 
MULTI-STYLE EQUITY FUND.  The investment objective of the Multi-Style Equity
Fund is to provide income and capital growth by investing principally in equity
securities. The Multi-Style Equity Fund invests primarily in common stocks of
medium and large capitalization companies. These companies are predominately
US-based, although the Fund may invest a limited portion of its assets in non-US
firms from time to time.
 
AGGRESSIVE EQUITY FUND.  The investment objective of the Aggressive Equity Fund
is to provide capital appreciation by assuming a higher level of volatility than
is ordinarily expected from Multi-Style Equity Fund by investing in equity
securities. The Aggressive Equity Fund invests primarily in common stocks of
small and medium capitalization companies. These companies are predominately
US-based, although the Fund may invest in non-US firms from time to time.
 
NON-U.S. FUND.  The investment objective of the Non-U.S. Fund is to provide
favorable total return and additional diversification for US investors by
investing primarily in equity and fixed-income securities of non-US companies,
and securities issued by non-US governments. The Non-U.S. Fund invests primarily
in equity securities issued by companies domiciled outside the United States and
in depository receipts, which represent ownership of securities of non-US
companies.
 
REAL ESTATE SECURITIES FUND.  The investment objective of the Real Estate
Securities Fund is to generate a high level of total return through above
average current income, while maintaining the potential for capital
appreciation. The Fund seeks to achieve its objective by concentrating its
investments in equity securities of issuers whose value is derived primarily
from development, management and market pricing of underlying real estate
properties.
 
CORE BOND FUND.  The investment objective of the Core Bond Fund is to maximize
total return, through capital appreciation and income, by assuming a level of
volatility consistent with the broad fixed-income market, by investing in
fixed-income securities. The Core Bond Fund invests primarily in fixed-income
securities. In particular, the Fund holds debt securities issued or guaranteed
by the US government, or to a lesser extent by non-US governments, or by their
respective agencies and instrumentalities. It also holds mortgage-backed
securities, including collateralized mortgage obligations. The Fund also invests
in corporate debt securities and dollar-denominated obligations issued in the US
by non-US banks and corporations (Yankee Bonds). A majority of the Fund's
holdings are US dollar-denominated. From time to time the Fund may invest in
municipal debt obligations.
 
- --------------------------------------------------------------------------------
 
DETAILED INFORMATION ABOUT THE POLICY
 
THE POLICY DESIGN
 
We have included this simplified description of the Variable CompLife-Registered
Trademark- Policy design in this section to help you understand how the Policy
is constructed. It omits details and important qualifications which are
discussed in the following sections.
 
The Policy combines a Minimum Guaranteed Death Benefit with Additional
Protection in an integrated policy design. The Minimum Guaranteed Death Benefit
represents permanent life insurance guaranteed for the lifetime of the insured
if premiums are paid when due and no Policy debt is outstanding. The Additional
Protection is guaranteed for a period of years which depends on the sex and risk
classification and age of the insured when the Policy is issued and the relative
proportions of Minimum Guaranteed Death Benefit and Additional Protection. For
an insured aged less than 43 the guaranteed period is not less than ten years.
It is generally longer for younger insureds and shorter for insureds who are
older, but will not be less than six years.
 
                                       --
                                       7
<PAGE>
We place net premiums in the Account divisions you select. The net premiums
increase the Policy Value. The Policy Value is the cumulative amount invested,
adjusted for investment results, reduced by the cost of insurance. The cost of
insurance is based on the net amount at risk. This is the amount of insurance in
force less the Policy Value. The cost of insurance also reflects the attained
age of the insured each year. If you pay premiums when they are due, and
investment experience is favorable, the Policy Value will increase year by year.
 
We have designed the Policy so that the increase in Policy Value over time
should reduce the net amount at risk. The reduction in the net amount at risk
offsets the rising cost of the mortality risk as the age of the insured
increases, reducing the total cost of insurance which we subtract from the
Policy Value each year. This scenario depends, however, on the investment
experience which is a principal factor in determining Policy Value. Investment
experience is not guaranteed. If investment experience does not produce a
sufficient rate of return, the amount of Additional Protection will be reduced
in later Policy years, or you will need to pay additional premium to keep the
Additional Protection from falling. For a typical Policy the average annual net
investment rate of return required to maintain the initial amount of Additional
Protection, without additional premium, should be between 4% and 6%, based on
the current charges and dividend scale. Any excess Policy Value (we call it the
"Excess Amount") is simply added to the death benefit and the cash value, dollar
for dollar, unless a greater increase in the death benefit is required to meet
tax requirements for life insurance. See "Excess Amount", p.16.
 
The Policy also allows you to pay of additional premiums to purchase variable
paid-up additional insurance. We calculate the values for the additional
insurance separately from those which support the initial amount of insurance.
The values for the variable paid-up additional insurance do not affect the
Policy Value. We allow unscheduled additional premiums to purchase variable
paid-up additional insurance, subject to insurability of the insured when we
accept the premiums.
 
REQUIREMENTS FOR INSURANCE
 
The minimum amount we require for the Minimum Guaranteed Death Benefit is
$100,000, reduced to $50,000 if the insured is below age 15 or over age 59. If
the initial premium is at least $10,000 ($5,000 for ages below 15) the required
minimum for the Minimum Guaranteed Death Benefit is $1,000. A lower minimum may
apply in some circumstances and will apply if the Policy is purchased for an
employer-sponsored benefit plan. See "Special Policy for Employers", p. 18. The
Minimum Guaranteed Death Benefit must always be at least $1,000.
 
Before issuing a Policy, we will require satisfactory evidence of insurability.
Non-smokers who meet preferred underwriting requirements are considered select
risks. Nonsmokers in the second best classification are considered standard plus
risks. The best class of smokers are considered standard risks. The premium is
different for each risk classification. We charge a higher premium for insureds
who do not qualify as select, standard plus or standard risks. The amount of
extra premium depends on the risk classification in which we place the insured.
 
PREMIUMS
 
The Policy provides for a level scheduled premium to be paid annually at the
beginning of each Policy year. Premiums are payable at our Home Office or to an
authorized Agent of Northwestern Mutual Life.
 
By administrative practice, we accept premiums on a monthly, quarterly or
semi-annual schedule. If you pay premiums more frequently than annually, we
place the scheduled net annual premium in the Account on each Policy
anniversary. We advance this amount on this date and we are reimbursed as we
receive your premium payments. You have no obligation to repay the amount that
we have advanced, but failure to pay the premiums when due will cause (a)
premium payments to be suspended (subject to the conditions described later in
this section), (b) the Policy to continue in force as a reduced amount of
paid-up insurance, or (c) the Policy to terminate. If you do not pay premiums
when they are due, we will reduce the Account assets supporting the Policy to
reflect the premiums due later in the Policy year.
 
Premiums you pay other than on an annual basis are increased to (1) reflect the
time value of money, based on an 8% interest rate, and (2) cover the
administrative costs to process the additional premium payments. A monthly
premium is currently equal to the annual premium times .0863 plus 50 cents.
Thus, the total of monthly premiums for a year is currently 3.56% plus $6.00
higher than a premium paid annually. You may pay monthly premiums only through
an automatic
 
                                       --
                                       8
<PAGE>
payment plan arranged with your bank. A quarterly premium is currently equal to
the annual premium times .2573 plus $2.00. A semiannual premium is equal to the
annual premium times .5096 plus $1.35.
 
The scheduled premium includes the premium for the Minimum Guaranteed Death
Benefit and the premium for any Additional Protection. The amount of the premium
depends on the amount of the Minimum Guaranteed Death Benefit and the amount of
Additional Protection, as well as the insured's age and risk classification. The
amount of the premium also reflects the sex of the insured except where state or
federal law requires that premiums and other charges and values be determined
without regard to sex. We send a notice to you not less than two weeks before
each premium is due.
 
You may select the proportions of Minimum Guaranteed Death Benefit and
Additional Protection, subject to the required minimum amount for the Minimum
Guaranteed Death Benefit. See "Requirements for Insurance", above.
 
Policies that include Additional Protection are subject to a minimum premium
that is equal to 70% of the premium for a Policy that consists solely of Minimum
Guaranteed Death Benefit. The premium for the Additional Protection consists of
two times the cost of term insurance (for the insured's age when the Policy was
issued) as long as this amount in combination with the premium for the Minimum
Guaranteed Death Benefit meets the 70% requirement. If this combination does not
meet the 70% requirement the premium for Additional Protection is increased to
bring the total up to the 70% level. We apply the amount by which the premium is
increased, after deductions, to increase the
Policy Value. In most cases we will also guarantee the Additional Protection for
a longer period.
 
In addition to the premium required for the Minimum Guaranteed Death Benefit and
any Additional Protection, the scheduled premium may include additional premium
to purchase paid-up additional insurance or to increase the Policy Value. The
scheduled premium will also include the premium required for any additional
benefit included as part of the Policy.
 
After the Policy is issued we will reduce the additional premium included in the
scheduled premium at any time upon your request. You may increase the additional
premium included in the scheduled premium, or you may pay optional unscheduled
additional premiums, at any time before the Policy anniversary nearest to the
insured's 85th birthday, subject to our insurability requirements and issue
limits.
 
If the Policy includes Additional Protection, we may require an increased
premium after the guaranteed period to prevent a reduction of the amount of
Additional Protection. We determine the increased premium, if required, each
year as of the date 25 days before the Policy anniversary. You are entitled to
pay the increased premium required to keep the Additional Protection from
falling until the insured reaches age 80 but this right terminates as of the
first Policy anniversary on which you do not pay the increased premium when it
is due.
 
You may suspend payment of scheduled premiums, at your option, if as of 25 days
prior to the Policy anniversary on or before the due date of the premium, (1)
the Excess Amount exceeds one year's minimum premium, and (2) the Policy Value
exceeds the sum of the net single premium for the amount of insurance then in
force, plus the present value of future charges for expenses, additional
benefits, and any extra mortality. See "Excess Amount", p. 16. The minimum
premium is the sum of the premiums for the Minimum Guaranteed Death Benefit, the
Additional Protection and any additional benefit included in the Policy. We will
calculate the net single premium and the present value of future charges using
the mortality basis for the cost of insurance charges with 6% interest. See
"Charges Against the Policy Value", p. 12. While payment of premiums is
suspended, certain charges ordinarily deducted from premiums will reduce the
Policy Value instead. You may resume payment of scheduled premiums as of any
Policy anniversary. You must resume payment of scheduled premiums as of the next
Policy anniversary if the Excess Amount, as of 25 days prior to the Policy
anniversary, is determined to be less than one year's minimum premium. You may
pay unscheduled additional premiums while suspension of scheduled premiums is in
effect, subject to our insurability requirements and issue limits.
 
The Policy provides for a grace period of 31 days for any premium that is not
paid when due. The Policy remains in force during this period. If you pay a
premium during the grace period, the values for the Policy will be the same as
if you had paid the premium when it was due. If you do not pay the premium
within the grace period, and the Policy does not qualify for premium suspension,
the Policy will terminate as of the date when the premium was due and will no
longer be in force, unless it is continued as
 
                                       --
                                       9
<PAGE>
paid-up insurance. See "Paid-Up Insurance", p. 16. If you surrender a Policy,
its cash value will be paid. See "Cash Value", p. 14.
 
The following table shows representative annual premiums for a Policy with an
initial amount of $400,000, divided equally between Minimum Guaranteed Death
Benefit and Additional Protection, for male select, standard plus and standard
risks, at three ages.
 
<TABLE>
<CAPTION>
                                                             MINIMUM      PREMIUM FOR
                                                            GUARANTEED      MINIMUM                     PREMIUM FOR
                                                              DEATH       GUARANTEED     ADDITIONAL     ADDITIONAL       TOTAL
                      AGE AT ISSUE                           BENEFIT     DEATH BENEFIT   PROTECTION     PROTECTION      PREMIUM
- ---------------------------------------------------------  ------------  -------------  -------------  -------------  -----------
<S>                                                        <C>           <C>            <C>            <C>            <C>
                                                                                           SELECT
15.......................................................   $  200,000     $   1,292     $   200,000     $     588     $   1,880
35.......................................................      200,000         2,610         200,000         1,010         3,620
55.......................................................      200,000         6,618         200,000         3,320         9,938
                                                                                       STANDARD PLUS
15.......................................................   $  200,000     $   1,406     $   200,000     $     608     $   2,014
35.......................................................      200,000         2,874         200,000         1,118         3,992
55.......................................................      200,000         7,196         200,000         4,428        11,624
                                                                                          STANDARD
15.......................................................   $  200,000     $   1,612     $   200,000     $     740     $   2,352
35.......................................................      200,000         3,362         200,000         1,310         4,672
55.......................................................      200,000         8,650         200,000         6,380        15,030
</TABLE>
 
DEATH BENEFIT
 
The death benefit for a Policy includes the Minimum Guaranteed Death Benefit,
any Additional Protection in effect, any Excess Amount and any paid-up
additional insurance. It is reduced by the amount of any Policy debt outstanding
and by an adjustment for any unpaid premiums which have been applied to purchase
paid-up additional insurance.
 
The Minimum Guaranteed Death Benefit you select when the Policy is issued will
neither increase nor decrease, regardless of the investment experience of the
Account divisions where assets for the Policy are held, so long as you pay
scheduled premiums when they are due and no Policy debt is outstanding. In
setting the premium rates for the Minimum Guaranteed Death Benefit we have
assumed that the Account assets will grow at a net annual rate of 4%. We bear
the risk that the rate of growth will be less. A higher rate of growth results
in an increase in the Policy Value.
 
The Additional Protection included in a Policy when it is issued will not
increase by reason of investment experience more favorable than the assumed 4%
net annual rate of growth. It will not decrease, regardless of investment
experience, until expiration of the guaranteed period, so long as you pay
scheduled premiums when they are due and no Policy debt is outstanding. A
condition for this guarantee is that you must use any dividends paid on the
Policy to increase Policy Value until the end of the guaranteed period unless
the Policy has an Excess Amount. See "Excess Amount" p. 16. After the guaranteed
period, the Additional Protection may be reduced unless the Policy Value exceeds
the amount defined by the formula in the Policy. We calculate the amount of
Policy Value, and the amount of increased premium required to prevent a
reduction in the Additional Protection, 25 days before each Policy anniversary.
You may pay any increased premium required to prevent a reduction in the
Additional Protection each year until the Policy anniversary nearest the
insured's 80th birthday, but this right terminates the first time you do not pay
any required increased premium when it is due.
 
The Policy Value represents the total cumulative net premiums for the Minimum
Guaranteed Death Benefit and the Additional Protection, including any additional
net premiums or Policy dividends which have been used to increase the Policy
Value, adjusted for investment experience, less the cost of insurance which we
deduct from the Policy Value on each Policy anniversary. The Policy Value may
exceed the amount required to support the Minimum Guaranteed Death Benefit and
the Additional Protection. This may result
 
                                       --
                                       10
<PAGE>
from favorable investment experience or from additional premium or Policy
dividends used to increase the Policy Value. The amount by which the Policy
Value exceeds the amount needed to support the Minimum Guaranteed Death Benefit
and the Additional Protection under a specified set of assumptions is called the
Excess Amount. See "Excess Amount", p. 16. Any Excess Amount will increase the
death benefit for the Policy, dollar-for-dollar, except as described in the next
paragraph. The Policy Value and any Excess Amount change daily.
 
We have designed the Policy to meet the definitional requirements for life
insurance in Section 7702 of the Internal Revenue Code. See "Tax Treatment of
Policy Benefits," p. 19. These rules require that the death benefit will never
be less than the Policy Value divided by the net single premium per dollar of
death benefit. The required difference between the death benefit and the Policy
Value is higher at younger ages than at older ages. The Policy provides for an
increase in the death benefit to the extent required to meet this test. After
the death benefit has been increased to meet this requirement an increase in the
Policy Value will cause a greater than dollar-for-dollar increase in the death
benefit, and a decrease in the Policy Value will cause a greater than
dollar-for-dollar decrease in the death benefit.
 
The death benefit is increased by the amount of any paid-up additional insurance
purchased with additional premium or Policy dividends. The amount and value of
the paid-up additional insurance vary daily to reflect investment experience and
are not guaranteed. The amount of any paid-up additional insurance is its value
used as a net single premium at the attained age of the insured.
 
POLICY VALUE AND PAID-UP ADDITIONAL INSURANCE
 
We determine the Policy Value and the value of any paid-up additional insurance
daily by separate calculations. An increase or decrease in the Policy Value has
no effect on the value of any paid-up additional insurance, and an increase or
decrease in the value of any paid-up additional insurance has no effect on the
Policy Value. You may increase or decrease the amount of scheduled additional
premium which you are paying to increase the Policy Value or to increase the
amount of paid-up additional insurance, and you may change the allocation for
applying this additional premium. You must make changes in the scheduled
additional premium and its allocation by written request. We may require
evidence of insurability. We do not permit increases in the scheduled additional
premium after the Policy anniversary nearest the insured's 85th birthday.
 
You may transfer the value of paid-up additional insurance to increase the
Policy Value by written request. This will generally result in a decrease in the
total death benefit. You may not transfer Policy Value to the value of paid-up
additional insurance.
 
ALLOCATIONS TO THE ACCOUNT
 
We place the first net annual premium for the Policy, including any net
scheduled additional premium, in the Account on the Policy date. We place the
net scheduled annual premium in the Account on each Policy anniversary
thereafter even if you are paying premiums on an other-than-annual frequency. We
will place net unscheduled premiums in the Account on the date they are received
at our Home Office. Net premiums are premiums less the deductions from premiums.
See "Deductions from Premiums", p. 12.
 
We invest premiums placed in the Account prior to the initial allocation date in
the Money Market Division of the Account. The initial allocation date is
identified in the Policy and is the latest of the Policy date, 45 days after the
date of the completed application or 32 days after we approve the application.
On the initial allocation date we invest the amount in the Money Market Division
in the Account divisions as you have directed in the application for the Policy.
You may change the allocation for future net premiums at any time by written
request and the change will be effective for premiums placed in the Account
thereafter. If you allocate any portion of a premium to a division, the division
must receive at least 10% of that premium.
 
You may apportion the Account assets supporting your Policy among as many as ten
divisions of the Account at any one time.
 
You may transfer accumulated amounts from one division of the Account to another
as often as twelve times in a Policy year. Transfers are effective on the date
we receive a written request at our Home Office. We reserve the right to charge
a fee of up to $25 to cover administrative costs of transfers. No fee is
presently charged.
 
                                       --
                                       11
<PAGE>
DEDUCTIONS AND CHARGES
 
DEDUCTIONS FROM PREMIUMS  We deduct a charge for taxes attributable to premiums
from each premium. The total amount of this deduction is 3.5% of the premium. Of
this amount 2.25% is for state premium taxes. Premium taxes vary from state to
state and currently range from .5% to 3.5% of life insurance premiums. The 2.25%
rate is an average. The tax rate for a particular state may be lower, higher, or
equal to the 2.25% deduction. We do not expect to profit from this charge. The
remainder of the deduction, 1.25% of each premium, is for federal income taxes
measured by premiums. We believe that this charge does not exceed a reasonable
estimate of an increase in our federal income taxes resulting from a change in
the Internal Revenue Code relating to deferred acquisition costs.
 
We deduct a charge of 4.5% for sales costs from each premium. We expect to
recover our sales expenses from this amount, over the period while the Policies
are in force, and from the surrender charges described below. The amounts we
deduct for sales costs in a Policy year are not specifically related to sales
costs incurred that year. To the extent that sales expenses exceed the amounts
deducted, we will pay the expenses from our other assets. These assets may
include, among other things, any gain realized from the charge against the
assets of the Account for the mortality and expense risks we have assumed. See
"Charges Against the Account Assets", p. 13. To the extent that the amounts
deducted for sales costs exceed the amounts needed, we will realize a gain.
 
We deduct an annual charge of $60 from premiums each year for administrative
costs to maintain the Policy. These expenses include costs of premium billing
and collection, processing claims, keeping records and communicating with
Policyowners. We retain the right to increase this charge after 10 years, but it
is guaranteed not to exceed $84 plus 12 cents per $1,000 of both the Minimum
Guaranteed Death Benefit and the Additional Protection. We do not expect to
profit from this charge.
 
We deduct an annual charge from premiums each of the first 10 years to
compensate us for expenses, other than sales expenses, incurred in conjunction
with issuance of the Policy. These expenses include the costs of processing
applications, medical examinations, determining insurability and establishing
records. The annual amount of this charge is $24 plus 12 cents per $1,000 of
Minimum Guaranteed Death Benefit and Additional Protection. If you surrender the
Policy before these charges have been deducted for 10 years, the remaining
charges will be reflected in the administrative surrender charge. See "Surrender
Charges", p. 13.
 
We deduct an annual charge of 12 cents per $1,000 of Minimum Guaranteed Death
Benefit from premiums each year to compensate us for the risk we have assumed by
guaranteeing the Minimum Guaranteed Death Benefit, as long as you pay all
premiums when they are due, no matter how unfavorable investment performance may
be.
 
We will also deduct any extra amounts we charge for insureds who do not qualify
as select, standard plus or standard risks, plus the cost of any additional
benefits purchased with the Policy, to determine the net annual premium.
 
CHARGES AGAINST THE POLICY VALUE  We deduct a cost of insurance charge from the
Policy Value on each Policy Anniversary. We determine the amount by multiplying
the net amount at risk by the cost of insurance rate. The net amount at risk is
the projected insurance amount, discounted at 4%, less the Policy Value. The
projected insurance amount is the amount of insurance at the end of the Policy
year, assuming that the Policy Value increases by the 4% annual growth rate
assumed in constructing the Policy. The cost of insurance rate reflects the
attained age of the insured. For select and standard risks, the cost of
insurance rate is based on the Commissioners 1980 Standard Ordinary Smoker and
Non-Smoker Mortality Tables. For other risks, the cost of insurance rate is
based on the Commissioners 1980 Standard Ordinary Mortality Tables. The cost of
insurance rates are included in the Policy. We also deduct a cost of insurance
charge from the cash value of any paid-up additional insurance on each Policy
anniversary. If we receive an unscheduled premium on a day other than a Policy
anniversary and the net amount at risk increases as a result, we will deduct a
cost of insurance charge on that day, reflecting the increase in the net amount
at risk and the portion of the Policy year remaining.
 
While payment of premiums is suspended, a portion of the annual charges which we
would ordinarily deduct from premiums will be deducted from the Policy Value
instead. We will also make this deduction on the Policy anniversary each year.
 
                                       --
                                       12
<PAGE>
We will also reduce the Policy Value by any surrender charges, administrative
charges or decrease in Policy debt that may result from a withdrawal, a decrease
in the face amount of insurance or a change to variable benefit paid-up
insurance.
 
CHARGES AGAINST THE ACCOUNT ASSETS  There is a daily charge to the Account for
the mortality and expense risks that we have assumed. The charge is at the
annual rate of .60% of the assets of the Account. The mortality risk is that
insureds may not live as long as we estimated. The expense risk is that expenses
of issuing and administering the Policies may exceed the estimated costs. We
will realize a gain from this charge to the extent it is not needed to provide
benefits and pay expenses under the Policies. The actual mortality and expense
experience under the Policies will be the basis for determining dividends. See
"Annual Dividends", p. 14.
 
The Policies provide that a charge for taxes may be made against the assets of
the Account. We are not currently making a daily charge for federal income taxes
we have incurred. In no event will the charge for taxes exceed that portion of
our actual tax expenses which is fairly allocable to the Policies.
 
TRANSACTION CHARGES  The Policy provides for a fee of up to $25 for a transfer
of assets among the Account divisions and for a fee of up to $25 for a
withdrawal of Excess Amount. We are currently waiving these charges.
 
SURRENDER CHARGES  If you surrender the Policy before you have paid the premium
that is due at the beginning of the fifteenth year, we will deduct surrender
charges from the Policy Value. A table of surrender charges is in the Policy.
 
The surrender charges consist of an administrative surrender charge and a
premium surrender charge. The administrative surrender charge is equal to the
sum of the issue expense charges which we have not deducted. The administrative
surrender charge in the first Policy year is $216, plus $1.08 per $1,000 of
Minimum Guaranteed Death Benefit and Additional Protection. This charge grades
down linearly each year as you pay the premium (or payment of premiums is
suspended) and is zero after you have paid the premium that is due at the
beginning of the tenth Policy year (or it is suspended).
 
The premium surrender charge is a percentage (shown in the table below) of the
surrender charge base. If payment of the premium for a Policy year has been
suspended, the premium surrender charge percentage will be as if you had paid
the annual premium. During the first five policy years, if you pay premiums more
frequently than annually we will adjust the premium surrender charge percentages
to reflect the actual period for which you have paid premiums.
 
If none of the premium payments during the first five Policy years have been
suspended, the surrender charge base equals the sum of an annual premium for the
Minimum Guaranteed Death Benefit (exclusive of the Policy fee and exclusive of
any charge for extra mortality) plus a term insurance premium for the initial
amount of Additional Protection.
 
If any of the premium payments during the first five Policy years have been
suspended, the surrender charge base equals the lesser of (1) the sum of an
annual premium for the Minimum Guaranteed Death Benefit (exclusive of the Policy
fee and exclusive of any charge for extra mortality) plus a term insurance
premium for the initial amount of Additional Protection, and (2) the sum of the
total premiums paid (exclusive of any premiums for additional benefits purchased
with the Policy, and premiums for extra mortality, and any extra amount for
premiums paid more often than annually) divided by the number of years
(including fractions), but not more than five, for which premiums have been paid
or suspended.
 
For a Policy that has a Minimum Guaranteed Death Benefit of $50,000 or more, the
surrender charges will not exceed $41.16 per $1,000 of Minimum Guaranteed Death
Benefit. For a Policy that has a Minimum Guaranteed Death Benefit of $100,000 or
more, issued for an insured ages 15-59, the surrender charges will not exceed
$22.86 per $1,000 of Minimum Guaranteed Death Benefit. The surrender charges
could equal or exceed the Policy Value but we will not apply the
 
                                       --
                                       13
<PAGE>
surrender charges to the value of any paid-up additional insurance.
 
<TABLE>
<CAPTION>
     FOR POLICIES                 PREMIUM SURRENDER CHARGE
  SURRENDERED AFTER                      PERCENTAGE
    PAYMENT OF THE      --------------------------------------------
  BEGINNING OF YEAR       ISSUE AGE 65 AND UNDER      ISSUE AGE 75
- ----------------------  ---------------------------  ---------------
<S>                     <C>                          <C>
          1                            24%                    24%
          2                            28%                  25.5%
          3                            32%                    27%
          4                            36%                  28.5%
     5 through 10                      40%                    30%
          11                           32%                    24%
          12                           24%                    18%
          13                           16%                    12%
          14                            8%                     6%
     15 and later                       0%                     0%
</TABLE>
 
For issue ages 66 through 74, the percentages are determined by linear
interpolation between the percentages shown.
 
GUARANTEE OF PREMIUMS, DEDUCTIONS AND CHARGES
 
We guarantee and may not increase the premiums for the Minimum Guaranteed Death
Benefit and the charge for mortality and expense risks. These amounts will not
increase regardless of future changes in longevity or increases in expenses.
 
CASH VALUE
 
The cash value for the Policy will change daily in response to investment
results. No minimum cash value is guaranteed. The cash value is equal to the
Policy Value plus the value of any paid-up additional insurance, reduced by any
Policy debt outstanding and the surrender charges. If you are not paying
premiums on an annual basis we reduce the cash value for any premiums due later
in the Policy year.
 
We determine the cash value for a Policy at the end of each valuation period.
Each business day, together with any non-business days before it, is a valuation
period. A business day is any day on which the New York Stock Exchange is open
for trading. In accordance with the requirements of the Investment Company Act
of l940, we may also determine the cash value for a Policy on any other day on
which there is sufficient trading in securities to materially affect the value
of the securities held by the Portfolios or Funds.
 
You may surrender your Policy for the cash value at any time during the lifetime
of the insured. Alternatively, you may request that we apply the cash value to
provide a reduced amount of fixed or variable paid-up insurance. See "Paid-Up
Insurance", p.16.
 
We will permit partial surrenders of the Policies so long as the Policy that
remains meets the regular minimum size requirements. A partial surrender will
cause the Policy to be split into two Policies. One Policy will be surrendered;
the other will continue in force on the same terms as the original Policy except
that the premiums will be based on the reduced amount of insurance. You will
receive a new Policy document. The cash value and the death benefit will be
proportionately reduced. We will make a deduction from the Policy proceeds for a
proportionate part of the surrender charges if a partial surrender takes place
before you have paid the premium that is due at the beginning of the fifteenth
Policy year. We will make a transaction charge when a partial surrender is
effected. The amount of the transaction charge will not exceed the actual
administrative costs for the transaction. We currently expect this charge to be
$250.
 
ANNUAL DIVIDENDS
 
The Policies share in divisible surplus to the extent we determine annually. We
will distribute a Policy's share annually as a dividend payable on each Policy
anniversary. Dividends under participating policies may be described as refunds
of premiums which adjust the cost of a policy to the actual level of cost
emerging over time after the policy's issue. Thus participating policies
generally have gross premiums which are higher than those for comparable
non-participating policies. Both federal and state tax law recognize that a
dividend is considered to be a refund of a portion of the premium paid.
 
Dividend illustrations published at the time a life insurance policy is issued
reflect the actual recent experience of the issuing company with respect to
investment earnings, mortality and expenses. State law generally prohibits a
company from projecting or estimating future results. State law also requires
that dividends be paid out of surplus, after certain necessary amounts are set
aside, and that such surplus be apportioned equitably among participating
policies. In summary, dividends must be based on actual experience and cannot be
guaranteed at issue of a policy.
 
                                       --
                                       14
<PAGE>
Our actuary annually examines current and recent experience and compares these
results with those which were assumed in determining premium rates when each
class of policies was issued. We determine classes by such factors as year of
issue, age, plan of insurance and risk classification. The actuary then
determines the amount of dividends to be equitably apportioned to each class of
policies. Following the actuary's recommendations, our Trustees adopt a dividend
scale each year, thereby authorizing the distribution of the dividend.
 
We have no significant actual mortality experience with variable life insurance
policies. For purposes of the current dividend scale used for the illustrations
in this prospectus, we have assumed that mortality experience in connection with
the Policies will be comparable to that actually experienced with fixed benefit
life insurance.
 
Dividends for variable life insurance are generally lower than those for
participating fixed benefit life insurance, primarily because a variable life
insurance policy provides a contractual mechanism for translation of investment
experience into a variable death benefit and variable cash value. For
participating fixed benefit life insurance the dividend includes amounts
produced by favorable investment results. Dividends based on the Minimum
Guaranteed Death Benefit for the Policies described in this prospectus are
expected be relatively low during the first 15 Policy years.
 
The prospectus illustrations show dividends being used to increase the Policy
Value. If the Policy has Additional Protection in force, the dividends will be
used to increase the Policy Value unless the Policy has Excess Amount. See
"Excess Amount", p. 16. If the Policy has Excess Amount, or if no Additional
Protection is in force, you may use dividends to purchase variable benefit
paid-up additional insurance, or to pay premiums, or we will pay the dividend in
cash. If the Policy is in force as fixed benefit paid-up insurance, you may use
dividends to purchase fixed benefit paid-up additional insurance or we will pay
you the dividend in cash. If the Policy is in force as variable benefit paid-up
insurance, you may use the dividends to purchase variable benefit paid-up
additional insurance or we will pay you the dividend in cash.
 
LOANS AND WITHDRAWALS
 
You may borrow up to 90% of the Policy's cash value using the Policy as
security. If a Policy loan is already outstanding, the maximum amount for any
new loan is 90% of the amount of cash value the Policy would have if there were
no loan, less the amount already borrowed. You may take loan proceeds in cash or
you may apply them to pay premiums on the Policy.
 
Interest on a Policy loan accrues and is payable on a daily basis. We add unpaid
interest to the amount of the loan. If the amount of the loan equals or exceeds
the Policy's cash value, the Policy will terminate. We will send you a notice at
least 31 days before the termination date. The notice will show how much you
must repay to keep the Policy in force.
 
You select the Policy loan interest rate. A specified annual effective rate of
5% is one choice. The other choice is a variable rate based on a corporate bond
yield index. We will adjust the variable rate annually, but it will not be less
than 5%.
 
We will take the amount of a Policy loan, including interest as it accrues, from
the Account divisions in proportion to the amounts in the divisions. We will
transfer the amounts withdrawn to our general account and will credit those
amounts on a daily basis with an annual earnings rate equal to the Policy loan
interest rate less a charge for the mortality and expense risks we have assumed
and for expenses, including taxes. The aggregate charge is currently at the
annual rate of .90% for the 5% specified Policy loan interest rate and .90% for
the variable Policy loan interest rate. For example, the earnings rate
corresponding to the specified 5% Policy loan interest rate is currently 4.10%.
A Policy loan, even if it is repaid, will have a permanent effect on the Policy
Value and cash value because the amounts borrowed will not participate in the
Account's investment results while the loan is outstanding. The effect may be
either favorable or unfavorable depending on whether the earnings rate credited
to the loan amount is higher or lower than the rate credited to the unborrowed
amount left in the Account.
 
Except when the Policy is in force as fixed benefit paid-up insurance, we will
allocate a Policy loan between Policy Value and variable paid-up additional
insurance in proportion to the amount of cash value attributable to each.
 
                                       --
                                       15
<PAGE>
You may repay a Policy loan, and any accrued interest outstanding, in whole or
in part, at any time. We will credit payments as of the date we receive them and
transfer them from our general account to the Account divisions, in proportion
to the amounts in the divisions, as of the same date.
 
You may make a withdrawal if the Excess Amount is sufficient. See "Excess
Amount", p. 16. A withdrawal may neither decrease the Excess Amount to less than
the surrender charge which would apply if the Policy were surrendered nor reduce
the loan value to less than any Policy debt outstanding. The minimum amount for
withdrawals is $250. An administrative charge of up to $25 may apply, but we are
currently waiving that charge.
 
A withdrawal of Policy Value decreases the death benefit by the same amount. If
the death benefit for a Policy has been increased to meet the federal tax
requirements for life insurance, the decrease in the death benefit caused by a
subsequent withdrawal may be larger than the amount of the withdrawal.
 
If cumulative withdrawals exceed the cumulative additional premiums which have
been used to increase the Policy Value, with both withdrawals and premiums
increased by 4% annual interest, subsequent unfavorable investment experience
may cause the Policy to lapse unless you pay an additional unscheduled premium
to increase the Policy Value. The due date for this premium is the Policy
anniversary following written notice to you.
 
EXCESS AMOUNT
 
The Excess Amount is the amount by which the Policy Value exceeds the Tabular
Cash Value for the sum of the Minimum Guaranteed Death Benefit and any
Additional Protection in effect. The Tabular Cash Value is an amount equal to a
Policy Value calculated assuming (1) a whole life Policy with a face amount
equal to the sum of the Minimum Guaranteed Death Benefit and the Additional
Protection, (2) all premiums are paid when due, (3) no additional premiums or
dividends used to increase Policy Value, (4) a 4% level annual rate of return,
and (5) maximum Policy charges apply. If you are not paying premiums on an
annual basis, the Excess Amount is reduced for any premiums due later in the
Policy year.
 
PAID-UP INSURANCE
 
If you do not pay a premium within the 31-day grace period, and the Policy does
not qualify for suspension of premium payments, the Policy will continue in
force as a reduced amount of fixed benefit paid-up insurance. Alternatively you
may select a reduced amount of variable benefit paid-up insurance. You must make
this selection during the grace period or sooner.
 
If the Policy is in force as a reduced amount of fixed benefit paid-up
insurance, we will transfer the amount of the cash value from the Account to our
general account. Thereafter the Policy will not participate in the Account's
investment results unless the Policy is subsequently reinstated. See
"Reinstatement", below. The minimum cash value for fixed benefit paid-up
insurance is $1,000. If the cash value is less than $1,000 as of the last day of
the grace period we will treat the Policy as surrendered. You may select
variable benefit paid-up insurance only if the cash value of the Policy is at
least $5,000.
 
We determine the amount of paid-up insurance by applying the amount of cash
value plus any Policy debt as a net single premium at the attained age. Paid-up
insurance has cash and loan values. For fixed benefit paid-up insurance the
amounts of these are guaranteed. For variable paid-up insurance neither the
death benefit or the cash value is guaranteed. Paid-up insurance remains in
force for the lifetime of the insured unless you surrender or terminate the
Policy. While the Policy is in force as either fixed or variable benefit paid-up
insurance the Minimum Guaranteed Death Benefit and any Additional Protection
will not be in effect. Any Policy debt will continue.
 
REINSTATEMENT
 
If a premium is due and remains unpaid after the grace period expires, the
Policy may be reinstated while the insured is alive within three years after the
premium due date. The insured must provide satisfactory evidence of insurability
unless reinstatement takes place within 31 days after the end of the grace
period. We may require a substantial payment. Following reinstatement the Policy
will have the same Minimum Guaranteed Death Benefit, Additional Protection,
Policy Value and paid-up additional insurance as if minimum premiums had been
paid when due. We will credit a 4% rate of investment earnings for the period
from the due date of the overdue premium to the date
 
                                       --
                                       16
<PAGE>
of reinstatement. We will make an adjustment for any Policy debt or the debt may
be reinstated. The Policy may not be reinstated if you have surrendered it for
its cash value.
 
RIGHT TO RETURN POLICY
 
You may return a Policy for a full refund of the premium you paid within 45 days
after you sign the application for insurance, or within 10 days after you
received the Policy, or within 10 days after a Notice of Cancellation Right is
mailed or delivered to you, whichever date is latest. You may mail or deliver
the Policy to the agent who sold it or to our Home Office. If returned, we will
consider the Policy void from the beginning.
 
RIGHT TO EXCHANGE FOR A FIXED BENEFIT POLICY
 
You may exchange a Policy for a whole life insurance policy with benefits that
do not vary with the investment experience of a separate account. You may elect
the exchange at any time within twenty-four months after the issue date of the
Policy provided premiums are duly paid. We do not require evidence of
insurability.
 
The new policy will be on the life of the same insured and will have the same
initial guaranteed death benefit, policy date and issue age. The premiums and
cash values will be the same as those for fixed benefit policies we issued on
the issue date of the Policy.
 
The exchange will be subject to an equitable cash adjustment. The amount will
recognize the difference in premiums and investment performance of the two
policies.
 
An exchange will be effective when we receive a proper written request, as well
as the Policy and any amount due on the exchange.
 
You may also exchange a Policy for a fixed benefit policy if either of the
mutual funds changes its investment adviser or if there is a material change in
the investment policies of a Portfolio or Fund. You will be given notice of any
such change and will have 60 days to make the exchange.
 
OTHER POLICY PROVISIONS
 
OWNER.  The owner is identified in the Policy. The owner may exercise all rights
under the Policy while the insured is living. Ownership may be transferred to
another. Written proof of the transfer must be received by Northwestern Mutual
Life at its Home Office. In this prospectus "you" means the owner or prospective
purchaser of a Policy.
 
BENEFICIARY.  The beneficiary is the person to whom the death benefit is
payable. The beneficiary is named in the application. After the Policy is issued
you may change the beneficiary in accordance with the Policy provisions.
 
INCONTESTABILITY.  We will not contest a Policy after it has been in force
during the lifetime of the insured for two years from the date of issue.
 
SUICIDE.  If the insured dies by suicide within one year from the date of issue,
the amount payable under the Policy will be limited to the premiums paid, less
the amount of any Policy debt and withdrawals and less the cash value of any
variable paid-up insurance surrendered.
 
MISSTATEMENT OF AGE OR SEX.  If the age or sex of the insured has been
misstated, we will adjust benefits under a Policy to reflect the correct age and
sex.
 
COLLATERAL ASSIGNMENT.  You may assign a Policy as collateral security. We are
not responsible for the validity or effect of a collateral assignment and will
not be deemed to know of an assignment before receipt of the assignment in
writing at our Home Office.
 
PAYMENT PLANS.  The Policy provides a variety of payment plans for Policy
benefits. Any Northwestern Mutual Life agent authorized to sell the Policies can
explain these provisions on request.
 
DEFERRAL OF DETERMINATION AND PAYMENT.  So long as premiums have been paid when
due, we will ordinarily pay Policy benefits within seven days after we receive
all required documents at our Home Office. However, we may defer determination
and payment of benefits during any period when it is not reasonably practicable
to value securities because the New York Stock Exchange is closed or an
emergency exists or the Securities and Exchange Commission, by order, permits
deferral for the protection of Policyowners.
 
If a Policy is in force as fixed benefit paid-up insurance, we have the right to
defer payment of the cash value for up to six months from the date of a Policy
loan or
 
                                       --
                                       17
<PAGE>
surrender. If payment is deferred for 30 days or more we will pay interest at an
annual effective rate of 4%.
 
VOTING RIGHTS
 
We are the owner of the mutual fund shares in which all assets of the Account
are invested. As the owner of the shares we will exercise our right to vote the
shares to elect directors of the funds, to vote on matters required to be
approved or ratified by mutual fund shareholders under the Investment Company
Act of 1940 and to vote on any other matters that may be presented to any
shareholders' meeting of the funds. However, we will vote the mutual fund shares
held in the Account in accordance with instructions from owners of the Policies.
We will vote any shares held in our general account in the same proportions as
the shares for which voting instructions are received. If the applicable laws or
regulations change so as to permit us to vote the shares in our own discretion,
we may elect to do so.
 
The number of mutual fund shares for each division of the Account for which the
owner of a Policy may give instructions is determined by dividing the amount of
the Policy's cash value apportioned to that division, if any, by the per share
value for the corresponding Portfolio or Fund. The number will be determined as
of a date we choose, but not more than 90 days before the shareholders' meeting.
Fractional votes are counted. We will solicit voting instructions with written
materials at least 14 days before the meeting. We will vote shares as to which
we receive no instructions in the same proportion as the shares as to which we
receive instructions.
 
We may, if required by state insurance officials, disregard voting instructions
which would require mutual fund shares to be voted for a change in the sub-
classification or investment objectives of a Portfolio or Fund, or to approve or
disapprove an investment advisory agreement for either of the mutual funds. We
may also disregard voting instructions that would require changes in the
investment policy or investment adviser for either a Portfolio or a Fund,
provided that we reasonably determine to take this action in accordance with
applicable federal law. If we disregard voting instructions we will include a
summary of the action and reasons therefor in the next semiannual report to the
owners of the Policies.
 
SUBSTITUTION OF FUND SHARES AND OTHER CHANGES
 
If, in our judgment, a Portfolio or Fund becomes unsuitable for continued use
with the Policies because of a change in investment objectives or restrictions,
we may substitute shares of another Portfolio or Fund or another mutual fund.
Any substitution of shares will be subject to any required approval of the
Securities and Exchange Commission, the Wisconsin Commissioner of Insurance or
other regulatory authority. We have also reserved the right, subject to
applicable federal and state law, to operate the Account or any of its divisions
as a management company under the Investment Company Act of 1940, or in any
other form permitted, or to terminate registration of the Account if
registration is no longer required, and to change the provisions of the Policies
to comply with any applicable laws.
 
REPORTS
 
For each Policy year (unless a Policy is in force as fixed benefit paid-up
insurance) you will receive a statement showing the death benefit, cash value
and any Policy loan (including interest charged) as of the anniversary date.
This report will show the apportionment of invested assets among the Account
divisions. You will also receive annual and semiannual reports for the Account
and both of the mutual funds, including financial statements.
 
SPECIAL POLICY FOR EMPLOYERS
 
A reduced minimum amount applies for Policies where the insurance involves an
employer sponsored benefit plan or arrangement. The sum of the Minimum
Guaranteed Death Benefit and the Additional Protection must be at least $10,000,
of which the Minimum Guaranteed Death Benefit must be at least $1,000. The
premium for the Additional Protection is two times the cost of term insurance
for the insured's age when the Policy is issued.
 
These Policies for employers may include a provision to permit the amount of
Additional Protection to increase after issue. Any such increase amount must be
based on the terms of the benefit plan or arrangement and may not be subject to
the discretion of the insured or the insured's beneficiary. A description of the
method of determining the amount of any increase is included in the Policy.
Changes to the amount of Additional Protection will be effective on Policy
anniversaries. The surrender charge and all charges for
 
                                       --
                                       18
<PAGE>
issue and administrative expenses will be based on the initial amount of
Additional Protection.
 
For certain situations where the insurance involves an employer sponsored
benefit plan or arrangement, federal law and the laws of certain states may
require that premiums and annuity rates be determined without regard to sex.
Special Policies are available for this purpose. You are urged to review any
questions in this area with qualified counsel.
 
DISTRIBUTION OF THE POLICIES
 
We sell the Policies through individuals who, in addition to being licensed life
insurance agents of Northwestern Mutual Life, are registered representatives of
Northwestern Mutual Investment Services, LLC ("NMIS"), our wholly-owned
subsidiary. NMIS is a registered broker-dealer under the Securities Exchange Act
of 1934 and is a member of the National Association of Securities Dealers. NMIS
was organized in 1968 and is a Wisconsin limited liability company. Its address
is 720 East Wisconsin Avenue, Milwaukee, Wisconsin 53202. The Internal Revenue
Service Employer Identification Number of NMIS is 39-0509570.
 
Commissions paid to the agents will not exceed 40% of the premium for the first
year, 6% of the premium for the second through tenth years, and 2 3/4% of the
premium thereafter.
 
Agents who meet certain productivity and persistency standards receive
additional compensation. We may pay new agents differently during a training
period. General agents and district agents who are registered representatives of
NMIS and have supervisory responsibility for sales of the Policies receive
commission overrides and other compensation.
 
TAX TREATMENT OF POLICY BENEFITS
 
The Policies are "life insurance contracts" as that term is defined in Sections
7702 and 817(h) of the Internal Revenue Code. Increases in cash value under a
Policy are not taxable until actual surrender of the Policy. Upon surrender, the
amount received is taxable at ordinary income rates under Section 72(e) of the
Code to the extent it exceeds the amount of the premiums paid under the Policy
less any dividends or other amounts previously received tax-free (basis of the
Policy). Death benefits are excludable from the beneficiary's gross income under
Section 101(a) of the Code.
 
Under certain limited circumstances, all or part of a partial surrender or a
withdrawal during the first 15 years may be taxable on a "gain first basis" to
the extent that the cash value of the Policy exceeds the basis of the Policy.
This means the amount surrendered or withdrawn may be taxable even if that
amount is less than the basis of the Policy.
 
We believe that loans received under the Policies (except modified endowment
contracts as described below) will be construed as indebtedness of an owner in
the same manner as loans under a fixed benefit life insurance policy and that no
part of any loan under a Policy will constitute income to the owner.
 
Policies will be classified as modified endowment contracts under Section 7702A
of the Internal Revenue Code if the aggregate premium paid during the first 7
years exceeds a defined "7-pay limit". Generally, this can occur if significant
additional premiums are paid or the death benefit is reduced within the first 7
years or if additional benefits are added to the Policy.
 
For Policies that are modified endowment contracts, withdrawals, partial
surrenders, Policy loans and dividends paid in cash are taxable as income on a
gain first basis. The taxable portion of these distributions would also be
subject to a 10% penalty if received prior to age 59 1/2, disability or
annuitization. For purposes of determining taxable income, all Policies that are
modified endowment contracts (including any fixed dollar policies that are
modified endowment contracts) issued by Northwestern Mutual Life to the
Policyowner during the same calendar year are aggregated.
 
Federal estate and state and local estate, inheritance and other tax
consequences of ownership or receipt of Policy proceeds depend upon the
circumstances of each Policy owner or beneficiary.
 
The foregoing summary does not purport to be complete or to cover all
situations. You should consult counsel and other competent advisers for more
complete information.
 
                                       --
                                       19
<PAGE>
- --------------------------------------------------------------------------------
 
OTHER INFORMATION
 
MANAGEMENT
 
Northwestern Mutual Life is managed by a Board of Trustees. The Trustees and
senior officers of Northwestern Mutual Life and their positions including Board
committee memberships, and their principal occupations, are as follows:
 
TRUSTEES
 
<TABLE>
<CAPTION>
NAME                                                            PRINCIPAL OCCUPATION DURING LAST FIVE YEARS
- ---------------------------------------------  ------------------------------------------------------------------------------
<S>                                            <C>
R. Quintus Anderson (A)......................  Chairman, Aarque Capital Corporation since 1997, prior thereto; Chairman, The
                                               Aarque Companies, Jamestown, NY (diversified metal products manufacturing)
 
Edward E. Barr (HR)..........................  Chairman, Sun Chemical Corporation, Fort Lee, New Jersey (graphic arts) since
                                               1998; prior thereto, President and Chief Executive Officer. President and
                                               Chief Executive Officer, DIC Americas, Inc., Fort Lee, NJ
 
Gordon T. Beaham, III (OT)...................  Chairman of the Board and President, Faultless Starch/Bon Ami Company, Kansas
                                               city, MO (consumer products manufacturer)
 
Robert C. Buchanan (A, E, F).................  President and Chief Executive Officer, Fox Valley Corporation, Appleton, WI
                                               (manufacturer of gift wrap and writing paper)
 
Robert E. Carlson (E)........................  Executive Vice President of Northwestern Mutual Life
 
George A. Dickerman (AM).....................  Chairman Emeritus, Spalding Sports Worldwide, Chicopee, MA (manufacturer of
                                               sporting equipment) since 1999; Chairman of the Board from 1998 to 1999; prior
                                               thereto, President
 
Pierre S. du Pont (AM).......................  Attorney, Richards, Layton and Finger, Wilmington, DE
 
James D. Ericson (AM, E, F, HR, OT)..........  President and Chief Executive Officer of Northwestern Mutual Life
 
J. E. Gallegos (A)...........................  Attorney at Law; President, Gallegos Law Firm, Santa Fe, New Mexico
 
Stephen N. Graff (E, F, OT)..................  Retired Partner, Arthur Andersen LLP (public accountants)
 
Patricia Albjerg Graham (HR).................  Professor, Graduate School of Education, Harvard University, Cambridge, MA,
                                               and President, The Spencer Foundation (social and behavioral sciences)
 
Stephen F. Keller (HR).......................  Attorney. Former Chairman, Santa Anita Realty Enterprises since 1997; prior
                                               thereto, Chairman
 
Barbara A. King (AM).........................  President, Landscape Structures, Inc., Delano, MN (manufacturer of playground
                                               equipment)
 
J. Thomas Lewis (HR).........................  Attorney (retired), New Orleans, LA since 1998; prior thereto, Attorney with
                                               Monroe & Lemann, New Orleans, LA
 
Daniel F. McKeithan, Jr. (E, F, HR)..........  President, Tamarack Petroleum Company, Inc., Milwaukee, WI (operator of oil
                                               and gas wells); President, Active Investor Management, Inc., Milwaukee, WI
 
Guy A. Osborn (E, F, OT).....................  Retired Chairman of Universal Foods Corporation, Milwaukee, WI since 1997;
                                               prior thereto, Chairman and Chief Executive Officer
 
Timothy D. Proctor (A).......................  Director, Worldwide Human Resources of Glaxo Wellcome plc, Greenford,
                                               Middlesex UB60NN, United Kingdom, since 1998; prior thereto, Senior Vice
                                               President Human Resources, General Counsel & Secretary (pharmaceuticals)
</TABLE>
 
                                       --
                                       20
<PAGE>
<TABLE>
<CAPTION>
NAME                                                            PRINCIPAL OCCUPATION DURING LAST FIVE YEARS
- ---------------------------------------------  ------------------------------------------------------------------------------
<S>                                            <C>
Donald J. Schuenke (AM, E, F)................  Retired Chairman of Northwestern Mutual Life
 
H. Mason Sizemore, Jr. (AM)..................  President and Chief Operating Officer, The Seattle Times, Seattle, WA
                                               (publishing)
 
Harold B. Smith (OT).........................  Chairman, Executive Committee, Illinois Tool Works, Inc., Chicago, IL
                                               (engineered components and industrial systems and consumables)
 
Sherwood H. Smith, Jr. (AM)..................  Chairman of the Board of Carolina Power & Light since 1997; prior thereto,
                                               Chairman of the Board and Chief Executive Officer
 
John E. Steuri (OT)..........................  Chairman, Advanced Thermal Technologies, Little Rock, AR since 1997 (heating,
                                               air-conditioning and humidity control). Retired since 1996 as Chairman and
                                               Chief Executive Officer of ALLTEL Information Services, Inc., Little Rock, AR
                                               (application software)
 
John J. Stollenwerk (AM, E, F)...............  President and Owner, Allen-Edmonds Shoe Corporation, Port Washington, WI
 
Barry L. Williams (HR).......................  President and Chief Executive Officer of Williams Pacific Ventures, Inc.,
                                               Redwood City, CA (venture capital)
 
Kathryn D. Wriston (A).......................  Director of various corporations, New York, NY
</TABLE>
 
<TABLE>
<S>  <C>  <C>                               <C>  <C>  <C>
A     --  Member, Audit Committee           F     --  Member, Finance Committee
AM    --  Member, Agency and Marketing      HR    --  Member, Human Resources and Public Policy
          Committee
E     --  Member, Executive Committee       OT    --  Member, Operations and Technology Committee
</TABLE>
 
SENIOR OFFICERS (OTHER THAN TRUSTEES)
 
<TABLE>
<CAPTION>
                                         POSITION WITH
         NAME                      NORTHWESTERN MUTUAL LIFE
- -----------------------  ---------------------------------------------
<S>                      <C>
John M. Bremer           Executive Vice President, General Counsel and
                         Secretary
Peter W. Bruce           Executive Vice President
Edward J. Zore           Executive Vice President
Deborah A. Beck          Senior Vice President
William H. Beckley       Senior Vice President
Mark G. Doll             Senior Vice President
Richard L. Hall          Senior Vice President
William C. Koenig        Senior Vice President and Chief Actuary
Donald L. Mellish        Senior Vice President
Mason G. Ross            Senior Vice President
John E. Schlifske        Senior Vice President
Leonard F. Stecklein     Senior Vice President
Frederic H. Sweet        Senior Vice President
Dennis Tamcsin           Senior Vice President
Walter J. Wojcik         Senior Vice President
Gary E. Long             Vice President and Controller
</TABLE>
 
REGULATION
 
We are subject to the laws of Wisconsin governing insurance companies and to
regulation by the Wisconsin Commissioner of Insurance. We file an annual
statement in a prescribed form with the Department of Insurance on or before
March 1 in each year covering operations for the preceding year and including
financial statements. Regulation by the Wisconsin Insurance Department includes
periodic examination to determine solvency and compliance with insurance laws.
We are also subject to the insurance laws and
 
                                       --
                                       21
<PAGE>
regulations of the other jurisdictions in which we are licensed to operate.
 
YEAR 2000 ISSUES
 
Since early 1996 we have been preparing for the computer requirements associated
with the approaching turn of the century. We completed assessment of our
internal systems in 1996. As of the date of this prospectus the necessary system
changes are substantially complete. System testing is in process and we expect
testing of all critical systems to be completed during the first six months of
1999.
 
The work on these computer systems extends to software packages we purchase from
vendors. In addition, we have been communicating formally with our business
partners to identify and assess potential exposure that could result from their
failure to address these computer issues on a timely basis. Each of our
departments has prepared a contingency plan.
 
We and our business partners bear all of the costs of identifying and resolving
the computer systems issues associated with the year 2000. These costs will have
no effect on the performance of the Account. The Policies permit some charges
for administrative expenses to be increased up to the guaranteed maximum rates.
However, we do not expect our costs for year 2000 compliance to have any
significant effect on the benefits or values provided by the Policies.
 
We believe that our computer systems will be ready for the year 2000 well in
advance of the deadline. By their nature, however, the issues in this area carry
the risk of unforeseen problems, both at Northwestern Mutual Life and at all the
other sites where supporting functions and interaction take place. There can be
no assurance that these problems will not have a material adverse impact on the
operations of Northwestern Mutual Life and the Account.
 
LEGAL PROCEEDINGS
 
We are engaged in litigation of various kinds which in our judgment is not of
material importance in relation to our total assets. There are no legal
proceedings pending to which the Account is a party.
 
REGISTRATION STATEMENT
 
We have filed a registration statement with the Securities and Exchange
Commission, Washington, D.C. under the Securities Act of 1933, as amended, with
respect to the Policies. This prospectus does not contain all the information
set forth in the registration statement. A copy of the omitted material is
available from the main office of the SEC in Washington, D.C. upon payment of
the prescribed fee. Further information about the Policies is also available
from the Home Office of Northwestern Mutual Life. The address and telephone
number are on the cover of this prospectus.
 
EXPERTS
 
The financial statements of Northwestern Mutual Life as of December 31, 1998 and
1997 and for each of the three years in the period ended December 31, 1998 and
of the Account as of December 31, 1998 and for each of the two years in the
period ended December 31, 1998 included in this prospectus have been so included
in reliance on the reports of PricewaterhouseCoopers LLP, independent
accountants, given on the authority of said firm as experts in auditing and
accounting. Actuarial matters included in this prospectus have been examined by
William C. Koenig, F.S.A., Senior Vice President and Chief Actuary of
Northwestern Mutual Life. His opinion is filed as an exhibit to the registration
statement.
 
                                       --
                                       22
<PAGE>
                     [LOGO]
 
REPORT OF INDEPENDENT ACCOUNTANTS
 
To The Northwestern Mutual Life Insurance Company and
Policyowners of Northwestern Mutual Variable Life Account
 
In our opinion, the accompanying combined statement of assets and liabilities
and the related combined and separate statements of operations and changes in
equity present fairly, in all material respects, the financial position of
Northwestern Mutual Variable Life Account and Aggressive Growth Stock Division,
International Equity Division, Growth Stock Division, Growth and Income Stock
Division, Index 500 Stock Division, Balanced Division, High Yield Bond Division,
Select Bond Division, and the Money Market Division thereof at December 31,
1998, the results of each of their operations and the changes in each of their
equity for each of the two years in the period ended December 31, 1998, in
conformity with generally accepted accounting principles. These financial
statements are the responsibility of The Northwestern Mutual Life Insurance
Company's management; our responsibility is to express an opinion on these
financial statements based on our audits. We conducted our audits of these
financial statements in accordance with generally accepted auditing standards
which require that we plan and perform the audit to obtain reasonable assurance
about whether the financial statements are free of material misstatement. An
audit includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, and evaluating the overall
financial statement presentation. We believe that our audits, which included
direct confirmation of the number of shares owned at December 31, 1998 with
Northwestern Mutual Series Fund, Inc., provide a reasonable basis for the
opinion expressed above.
 
/s/ PricewaterhouseCoopers LLP
 
Milwaukee, Wisconsin
January 25, 1999
 
                                       --
                                       23
<PAGE>
NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
Financial Statements
DECEMBER 31, 1998
STATEMENT OF ASSETS AND LIABILITIES
(IN THOUSANDS)
 
<TABLE>
<S>                                                 <C>         <C>
ASSETS
  Investments at Market Value:
    Northwestern Mutual Series Fund, Inc.
      Aggressive Growth Stock
       34,420 shares (cost $102,404)..............  $ 119,230
      International Equity
       46,760 shares (cost $73,163)...............     78,416
      Growth Stock
       29,383 shares (cost $49,267)...............     66,025
      Growth and Income Stock
       43,428 shares (cost $60,081)...............     70,528
      Index 500 Stock
       58,115 shares (cost $126,062)..............    191,141
      Balanced
       71,092 shares (cost $108,217)..............    158,110
      High Yield Bond
       15,509 shares (cost $16,804)...............     14,516
      Select Bond
       10,143 shares (cost $12,181)...............     12,669
      Money Market
       39,300 shares (cost $39,300)...............     39,300   $ 749,935
                                                    ---------
Due from Sale of Fund Shares..................................         95
Due from Northwestern Mutual Life Insurance Company...........        328
                                                                ---------
Total Assets..................................................  $ 750,358
                                                                ---------
                                                                ---------
LIABILITIES
  Due to Northwestern Mutual Life Insurance Company...........  $      95
  Due on Purchase of Fund Shares..............................        328
                                                                ---------
      Total Liabilities.......................................        423
                                                                ---------
EQUITY (NOTE 8)
  Variable Life Policies Issued Before October 11, 1995.......    392,772
  Variable Complife Policies Issued On or After October 11,
   1995.......................................................    356,862
  Variable Executive Life Policies Issued On or After March 2,
   1998.......................................................        301
                                                                ---------
      Total Equity............................................    749,935
                                                                ---------
      Total Liabilities and Equity............................  $ 750,358
                                                                ---------
                                                                ---------
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                       --
                                       24
<PAGE>
NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
Statements of Operations and Changes in Equity
(IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                      AGGRESSIVE GROWTH             INTERNATIONAL EQUITY
                                          COMBINED                     STOCK DIVISION                     DIVISION
                                -----------------------------   -----------------------------   -----------------------------
                                 YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED
                                DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,
                                    1998            1997            1998            1997            1998            1997
                                -------------   -------------   -------------   -------------   -------------   -------------
<S>                             <C>             <C>             <C>             <C>             <C>             <C>
INVESTMENT INCOME
Dividend Income...............    $ 24,922        $ 24,262        $  3,287         $3,345         $ 3,591         $ 1,286
Mortality and Expense Risks...       2,755           1,788             424            271             308             197
Taxes.........................       1,178             767             181            116             132              85
                                -------------   -------------   -------------   -------------   -------------   -------------
Net Investment Income.........      20,989          21,707           2,682          2,958           3,151           1,004
                                -------------   -------------   -------------   -------------   -------------   -------------
REALIZED AND UNREALIZED GAIN
  (LOSS) ON INVESTMENTS
  Realized Gain on
    Investments...............       4,332           4,871             523            231             284             203
  Unrealized Appreciation
    (Depreciation) of
    Investments During the
    Period....................      68,780          42,532           4,928          5,109          (1,424)          2,358
                                -------------   -------------   -------------   -------------   -------------   -------------
  Net Gain (Loss) on
    Investments...............      73,112          47,403           5,451          5,340          (1,140)          2,561
                                -------------   -------------   -------------   -------------   -------------   -------------
  Increase in Equity Derived
    from Investment
    Activity..................      94,101          69,110           8,133          8,298           2,011           3,565
                                -------------   -------------   -------------   -------------   -------------   -------------
EQUITY TRANSACTIONS
  Policyowners' Net
    Deposits..................     258,672         170,672          30,145         21,502          20,672          12,656
  Policy Loans, Surrenders,
    and Death Benefits........     (37,427)        (23,728)         (6,454)        (4,003)         (4,327)         (2,787)
  Mortality and Other (net)...     (39,611)        (28,427)         (5,193)        (3,791)         (3,785)         (2,368)
  Transfers from Other
    Divisions.................     133,775          86,366          20,371         19,008          15,743          14,866
  Transfers to Other
    Divisions.................    (133,773)        (86,366)         (6,419)        (4,091)         (5,013)         (2,149)
                                -------------   -------------   -------------   -------------   -------------   -------------
Increase in Equity Derived
  from Equity Transactions....     181,636         118,517          32,450         28,625          23,290          20,218
                                -------------   -------------   -------------   -------------   -------------   -------------
Net Increase in Equity........     275,737         187,627          40,583         36,923          25,301          23,783
EQUITY
  Beginning of Year...........     474,198         286,571          78,647         41,724          53,116          29,333
                                -------------   -------------   -------------   -------------   -------------   -------------
  End of Year.................    $749,935        $474,198        $119,230         $78,647        $78,417         $53,116
                                -------------   -------------   -------------   -------------   -------------   -------------
                                -------------   -------------   -------------   -------------   -------------   -------------
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                      ---
                                       25
<PAGE>
NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
Statements of Operations and Changes in Equity
(IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                       GROWTH & INCOME                    INDEX 500
                                    GROWTH STOCK DIVISION              STOCK DIVISION                  STOCK DIVISION
                                -----------------------------   -----------------------------   -----------------------------
                                 YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED
                                DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,
                                    1998            1997            1998            1997            1998            1997
                                -------------   -------------   -------------   -------------   -------------   -------------
<S>                             <C>             <C>             <C>             <C>             <C>             <C>
INVESTMENT INCOME
Dividend Income...............    $   956         $ 1,413         $   537         $ 7,776         $  4,530        $  2,579
Mortality and Expense Risks...        211             105             234             120              671             395
Taxes.........................         91              45             100              52              287             169
                                -------------   -------------   -------------   -------------   -------------   -------------
Net Investment Income.........        654           1,263             203           7,604            3,572           2,015
                                -------------   -------------   -------------   -------------   -------------   -------------
REALIZED AND UNREALIZED GAIN
  (LOSS) ON INVESTMENTS
  Realized Gain on
    Investments...............        143             172             220             173            1,125           2,375
  Unrealized Appreciation
    (Depreciation) of
    Investments During the
    Period....................     10,533           4,151          10,574          (1,823)          31,738          17,772
                                -------------   -------------   -------------   -------------   -------------   -------------
  Net Gain (Loss) on
    Investments...............     10,676           4,323          10,794          (1,650)          32,863          20,147
                                -------------   -------------   -------------   -------------   -------------   -------------
  Increase in Equity Derived
    from Investment
    Activity..................     11,330           5,586          10,997           5,954           36,435          22,162
                                -------------   -------------   -------------   -------------   -------------   -------------
EQUITY TRANSACTIONS
  Policyowners' Net
    Deposits..................     12,991           7,334          14,771           7,537           29,665          19,733
  Policy Loans, Surrenders,
    and Death Benefits........     (2,859)         (1,314)         (2,902)         (1,842)          (8,924)         (5,039)
  Mortality and Other (net)...     (2,494)         (1,329)         (2,847)         (1,457)          (5,367)         (4,127)
  Transfers from Other
    Divisions.................     16,839           8,851          17,225          10,673           37,076          20,024
  Transfers to Other
    Divisions.................     (2,015)         (1,341)         (3,106)         (1,104)          (5,443)         (3,783)
                                -------------   -------------   -------------   -------------   -------------   -------------
Increase in Equity Derived
  from Equity Transactions....     22,462          12,201          23,141          13,807           47,007          26,808
                                -------------   -------------   -------------   -------------   -------------   -------------
Net Increase in Equity........     33,792          17,787          34,138          19,761           83,442          48,970
EQUITY
  Beginning of Year...........     32,233          14,446          36,389          16,628          107,699          58,729
                                -------------   -------------   -------------   -------------   -------------   -------------
  End of Year.................    $66,025         $32,233         $70,527         $36,389         $191,141        $107,699
                                -------------   -------------   -------------   -------------   -------------   -------------
                                -------------   -------------   -------------   -------------   -------------   -------------
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                      ---
                                       26
<PAGE>
NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
Statements of Operations and Changes in Equity
(IN THOUSANDS)
<TABLE>
<CAPTION>
                                      BALANCED DIVISION           HIGH YIELD BOND DIVISION          SELECT BOND DIVISION
                                -----------------------------   -----------------------------   -----------------------------
                                 YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED
                                DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,
                                    1998            1997            1998            1997            1998            1997
                                -------------   -------------   -------------   -------------   -------------   -------------
<S>                             <C>             <C>             <C>             <C>             <C>             <C>
INVESTMENT INCOME
Dividend Income...............    $  8,344        $  5,105        $ 1,489          $1,370         $   743          $  436
Mortality and Expense Risks...         681             558             53              29              51              35
Taxes.........................         292             239             22              12              22              15
                                -------------   -------------   -------------   -------------   -------------   -------------
Net Investment Income.........       7,371           4,308          1,414           1,329             670             386
                                -------------   -------------   -------------   -------------   -------------   -------------
REALIZED AND UNREALIZED GAIN
  (LOSS) ON INVESTMENTS
  Realized Gain on
    Investments...............       1,893           1,655             47              26              97              36
  Unrealized Appreciation
    (Depreciation) of
    Investments During the
    Period....................      14,317          15,262         (1,828)           (531)            (58)            234
                                -------------   -------------   -------------   -------------   -------------   -------------
  Net Gain (Loss) on
    Investments...............      16,210          16,917         (1,781)           (505)             39             270
                                -------------   -------------   -------------   -------------   -------------   -------------
  Increase in Equity Derived
    from Investment
    Activity..................      23,581          21,225           (367)            824             709             656
                                -------------   -------------   -------------   -------------   -------------   -------------
EQUITY TRANSACTIONS
  Policyowners' Net
    Deposits..................      17,811          15,394          3,490           1,922           2,004           1,820
  Policy Loans, Surrenders,
    and Death Benefits........      (8,879)         (7,260)          (690)           (349)           (620)           (311)
  Mortality and Other (net)...      (3,232)         (3,395)          (641)           (339)           (250)           (560)
  Transfers from Other
    Divisions.................       7,905           4,266          5,399           3,276           3,951           2,000
  Transfers to Other
    Divisions.................      (5,398)         (4,734)        (1,476)           (425)         (2,217)           (756)
                                -------------   -------------   -------------   -------------   -------------   -------------
Increase in Equity Derived
  from Equity Transactions....       8,207           4,271          6,082           4,085           2,868           2,193
                                -------------   -------------   -------------   -------------   -------------   -------------
Net Increase in Equity........      31,788          25,496          5,715           4,909           3,577           2,849
EQUITY
  Beginning of Year...........     126,322         100,826          8,801           3,892           9,092           6,243
                                -------------   -------------   -------------   -------------   -------------   -------------
  End of Year.................    $158,110        $126,322        $14,516          $8,801         $12,669          $9,092
                                -------------   -------------   -------------   -------------   -------------   -------------
                                -------------   -------------   -------------   -------------   -------------   -------------
 
<CAPTION>
 
                                    MONEY MARKET DIVISION
                                -----------------------------
 
                                 YEAR ENDED      YEAR ENDED
                                DECEMBER 31,    DECEMBER 31,
                                    1998            1997
                                -------------   -------------
<S>                             <C>             <C>
INVESTMENT INCOME
Dividend Income...............    $ 1,445         $   952
Mortality and Expense Risks...        122              78
Taxes.........................         51              34
                                -------------   -------------
Net Investment Income.........      1,272             840
                                -------------   -------------
REALIZED AND UNREALIZED GAIN
  (LOSS) ON INVESTMENTS
  Realized Gain on
    Investments...............         --              --
  Unrealized Appreciation
    (Depreciation) of
    Investments During the
    Period....................         --              --
                                -------------   -------------
  Net Gain (Loss) on
    Investments...............         --              --
                                -------------   -------------
  Increase in Equity Derived
    from Investment
    Activity..................      1,272             840
                                -------------   -------------
EQUITY TRANSACTIONS
  Policyowners' Net
    Deposits..................    127,123          82,774
  Policy Loans, Surrenders,
    and Death Benefits........     (1,772)           (823)
  Mortality and Other (net)...    (15,802)        (11,061)
  Transfers from Other
    Divisions.................      9,266           3,402
  Transfers to Other
    Divisions.................   (102,686)        (67,983)
                                -------------   -------------
Increase in Equity Derived
  from Equity Transactions....     16,129           6,309
                                -------------   -------------
Net Increase in Equity........     17,401           7,149
EQUITY
  Beginning of Year...........     21,899          14,750
                                -------------   -------------
  End of Year.................    $39,300         $21,899
                                -------------   -------------
                                -------------   -------------
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                      ---
                                       27
<PAGE>
NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
Notes to Financial Statements
DECEMBER 31, 1998
 
NOTE 1 -- Northwestern Mutual Variable Life Account (the "Account") is
registered as a unit investment trust under the Investment Company Act of 1940
and is a segregated asset account of The Northwestern Mutual Life Insurance
Company ("Northwestern Mutual") used to fund variable life insurance policies.
 
NOTE 2 -- The preparation of the financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates. Principal
accounting policies are summarized below.
 
NOTE 3 -- All assets of each Division of the Account are invested in shares of
the corresponding Portfolio of Northwestern Mutual Series Fund, Inc. (the
"Fund"). The shares are valued at the Fund's offering and redemption price per
share. The Fund is a diversified open-end investment company registered under
the Investment Company Act of 1940.
 
NOTE 4 -- Dividend income from the Fund is recorded on the record date of the
dividends. Transactions in Fund shares are accounted for on the trade date. The
basis for determining cost on sale of Fund shares is identified cost. Purchases
and sales of Fund shares for the year ended December 31, 1998 by each Division
are shown below:
 
<TABLE>
<CAPTION>
                                    PURCHASES       SALES
                                   ------------  ------------
<S>                                <C>           <C>
Aggressive Growth Division.......  $ 36,381,397  $  1,248,015
International Equity Division....    27,429,118       990,001
Growth Stock Division............    23,393,892       279,458
Growth & Income Stock
  Division.......................    24,059,882       715,896
Index 500 Stock Division.........    52,625,759     2,046,627
Balanced Division................    20,647,579     5,068,597
High Yield Bond Division.........     8,131,249       635,946
Select Bond Division.............     5,351,461     1,813,834
Money Market Division............    47,332,350    29,930,945
</TABLE>
 
NOTE 5 -- A deduction for mortality and expense risks is determined daily and
paid to Northwestern Mutual. Generally, for Variable Life policies issued before
October 11, 1995, and Variable Complife policies issued on or after October 11,
1995 the deduction is at an annual rate of .50% and .60%, respectively, of the
net assets of the Account. A deduction for the mortality and expense risks for
the Variable Executive Life policies issued on or after March 3, 1998 is
determined monthly at an annual rate of .75% of the amount invested in the
Account for the Policy for the first ten Policy years, and .30% thereafter. The
mortality risk is that insureds may not live as long as estimated. The expense
risk is that expenses of issuing and administering the policies may exceed the
estimated costs.
 
Certain deductions are also made from the annual, single or other premiums
before amounts are allocated to the Account. These deductions are for (1) sales
load, (2) administrative expenses, (3) taxes and (4) a risk charge for the
guaranteed minimum death benefit.
 
Additional mortality costs are deducted from the policy annually and are paid to
Northwestern Mutual to cover the cost of providing insurance protection. This
cost is actuarially calculated based upon the insured's age, the 1980
Commissioners Standard Ordinary Mortality Table and the amount of insurance
provided under the policy.
 
NOTE 6 -- Northwestern Mutual is taxed as a "life insurance company" under the
Internal Revenue Code. The variable life insurance policies which are funded in
the Account are taxed as part of the operations of Northwestern Mutual. Policies
provide that a charge for taxes may be made against the assets of the Account.
Generally, for Variable Life policies issued before October 11, 1995,
Northwestern Mutual charges the Account at an annual rate of .20% of the
Account's net assets and reserves the right to increase, decrease or eliminate
the charge for taxes in the future. Generally, for Variable Complife policies
issued on or after October 11, 1995, and for Variable Executive Life policies
issued on or after March 3, 1998, there is no charge being made against the
assets of the Account for federal income taxes, but Northwestern Mutual reserves
the right to charge for taxes in the future.
 
NOTE 7 -- The Account is credited for the policyowners' net annual premiums at
the respective policy anniversary dates regardless of when policyowners actually
paid their premiums. Northwestern Mutual's equity represents any unpaid portion
of net annual premiums. This applies to Variable Life and Variable Complife
policies only.
 
                                       --
                                       28
<PAGE>
NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
Notes to Financial Statements
(in thousands)
DECEMBER 31, 1998
NOTE 8 -- Equity Values by Division are shown below:
 
<TABLE>
<CAPTION>
                                                                                                VARIABLE LIFE
                                                                                            POLICIES ISSUED BEFORE
                                                                                               OCTOBER 11, 1995
                                                                                                  EQUITY OF:
                                                                                           ------------------------    TOTAL
                                                                                           POLICYOWNERS      NML      EQUITY
                                                                                           -------------  ---------  ---------
<S>                                                                                        <C>            <C>        <C>
Aggressive Growth Stock Division.........................................................    $  42,391    $   3,793  $  46,184
International Equity Division............................................................       32,539        3,074     35,613
Growth Stock Division....................................................................       22,888        1,510     24,398
Growth and Income Stock Division.........................................................       26,309        1,808     28,117
Index 500 Stock Division.................................................................       95,615        4,943    100,558
Balanced Division........................................................................      134,029        5,006    139,035
High Yield Bond Division.................................................................        4,916          428      5,344
Select Bond Division.....................................................................        6,911          417      7,328
Money Market Division....................................................................        5,918          277      6,195
                                                                                           -------------  ---------  ---------
                                                                                             $ 371,516    $  21,256  $ 392,772
                                                                                           -------------  ---------  ---------
                                                                                           -------------  ---------  ---------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                             VARIABLE COMPLIFE
                                                                                           POLICIES ISSUED ON OR
                                                                                           AFTER OCTOBER 11, 1995
                                                                                                 EQUITY OF:
                                                                                          ------------------------    TOTAL
                                                                                          POLICYOWNERS      NML      EQUITY
                                                                                          -------------  ---------  ---------
<S>                                                                                       <C>            <C>        <C>
Aggressive Growth Stock Division........................................................    $  54,132    $  18,846  $  72,978
International Equity Division...........................................................       31,302       11,492     42,794
Growth Stock Division...................................................................       30,575       11,026     41,601
Growth and Income Stock Division........................................................       30,515       11,841     42,356
Index 500 Stock Division................................................................       65,609       24,890     90,499
Balanced Division.......................................................................       14,142        4,909     19,051
High Yield Bond Division................................................................        6,565        2,594      9,159
Select Bond Division....................................................................        4,161        1,171      5,332
Money Market Division...................................................................       13,154       19,938     33,092
                                                                                          -------------  ---------  ---------
                                                                                            $ 250,155    $ 106,707  $ 356,862
                                                                                          -------------  ---------  ---------
                                                                                          -------------  ---------  ---------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                         VARIABLE EXECUTIVE LIFE
                                                                                                          POLICIES ISSUED ON OR
                                                                                                           AFTER MARCH 2, 1998
                                                                                                        -------------------------
                                                                                                                  TOTAL
                                                                                                                 EQUITY
                                                                                                        -------------------------
<S>                                                                                                     <C>
Aggressive Growth Stock Division......................................................................          $      67
International Equity Division.........................................................................                 10
Growth Stock Division.................................................................................                 25
Growth and Income Stock Division......................................................................                 55
Index 500 Stock Division..............................................................................                 84
Balanced Division.....................................................................................                 24
High Yield Bond Division..............................................................................                 13
Select Bond Division..................................................................................                  9
Money Market Division.................................................................................                 14
                                                                                                                    -----
                                                                                                                $     301
                                                                                                                    -----
                                                                                                                    -----
</TABLE>
 
                                      ---
                                       29
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
CONSOLIDATED STATEMENT OF FINANCIAL POSITION
 
(IN MILLIONS)
 
The following financial statements of Northwestern Mutual should be considered
only as bearing upon the ability of Northwestern Mutual Life to meet its
obligations under the Policies.
 
<TABLE>
<CAPTION>
                                                        DECEMBER 31,
                                                    ---------------------
                                                      1998        1997
                                                    ---------   ---------
<S>                                                 <C>         <C>
ASSETS
    Bonds.........................................  $  34,888   $  32,359
    Common and preferred stocks...................      6,576       6,524
    Mortgage loans................................     12,250      10,835
    Real estate...................................      1,481       1,372
    Policy loans..................................      7,580       7,163
    Other investments.............................      1,839       2,026
    Cash and temporary investments................      1,275         572
    Due and accrued investment income.............        827         795
    Other assets..................................      1,313       1,275
    Separate account assets.......................      9,966       8,160
                                                    ---------   ---------
        Total assets..............................  $  77,995   $  71,081
                                                    ---------   ---------
                                                    ---------   ---------
LIABILITIES AND SURPLUS
    Reserves for policy benefits..................  $  51,815   $  47,343
    Policy benefit and premium deposits...........      1,709       1,624
    Policyowner dividends payable.................      2,870       2,640
    Interest maintenance reserve..................        606         461
    Asset valuation reserve.......................      1,994       1,974
    Income taxes payable..........................      1,161       1,043
    Other liabilities.............................      3,133       3,735
    Separate account liabilities..................      9,966       8,160
                                                    ---------   ---------
        Total liabilities.........................     73,254      66,980
    Surplus.......................................      4,741       4,101
                                                    ---------   ---------
        Total liabilities and surplus.............  $  77,995   $  71,081
                                                    ---------   ---------
                                                    ---------   ---------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                       --
                                       30
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
CONSOLIDATED STATEMENT OF OPERATIONS
 
(IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                     FOR THE YEAR ENDED DECEMBER 31,
                                                    ---------------------------------
                                                      1998        1997        1996
                                                    ---------   ---------   ---------
<S>                                                 <C>         <C>         <C>
REVENUE
    Premium income................................  $  8,021    $  7,294    $  6,667
    Net investment income.........................     4,536       4,171       3,836
    Other income..................................       922         861         759
                                                    ---------   ---------   ---------
        Total revenue.............................    13,479      12,326      11,262
                                                    ---------   ---------   ---------
BENEFITS AND EXPENSES
    Benefit payments to policyowners and
     beneficiaries................................     3,602       3,329       2,921
    Net additions to policy benefit reserves......     4,521       4,026       3,701
    Net transfers to separate accounts............       564         566         579
                                                    ---------   ---------   ---------
        Total benefits............................     8,687       7,921       7,201
    Operating expenses............................     1,297       1,138       1,043
                                                    ---------   ---------   ---------
        Total benefits and expenses...............     9,984       9,059       8,244
                                                    ---------   ---------   ---------
Gain from operations before dividends and taxes...     3,495       3,267       3,018
Policyowner dividends.............................     2,869       2,636       2,341
                                                    ---------   ---------   ---------
Gain from operations before taxes.................       626         631         677
Income tax expense................................       301         356         452
                                                    ---------   ---------   ---------
Net gain from operations..........................       325         275         225
Net realized capital gains........................       484         414         395
                                                    ---------   ---------   ---------
        Net income................................  $    809    $    689    $    620
                                                    ---------   ---------   ---------
                                                    ---------   ---------   ---------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                       --
                                       31
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
CONSOLIDATED STATEMENT OF CHANGES IN SURPLUS
 
(IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                      FOR THE YEAR ENDED DECEMBER 31,
                                                      -------------------------------
                                                       1998        1997        1996
                                                      -------     -------     -------
<S>                                                   <C>         <C>         <C>
BEGINNING OF YEAR BALANCE.........................    $4,101      $3,515      $2,786
  Net income......................................       809         689         620
  Increase (decrease) in net unrealized gains.....      (147)        576         295
  Increase in investment reserves.................       (20)       (526)       (176)
  Other, net......................................        (2)       (153)        (10)
                                                      -------     -------     -------
  Net increase in surplus.........................       640         586         729
                                                      -------     -------     -------
END OF YEAR BALANCE...............................    $4,741      $4,101      $3,515
                                                      -------     -------     -------
                                                      -------     -------     -------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                       --
                                       32
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
CONSOLIDATED STATEMENT OF CASH FLOWS
 
(IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                       FOR THE YEAR ENDED DECEMBER 31,
                                                      ----------------------------------
                                                        1998         1997         1996
                                                      --------     --------     --------
<S>                                                   <C>          <C>          <C>
CASH FLOWS FROM OPERATING ACTIVITIES
  Insurance and annuity premiums..................    $ 8,876      $ 8,093      $ 7,361
  Investment income received......................      4,216        3,928        3,634
  Disbursement of policy loans, net of
   repayments.....................................       (416)        (360)        (326)
  Benefits paid to policyowners and
   beneficiaries..................................     (3,572)      (3,316)      (2,912)
  Net transfers to separate accounts..............       (564)        (565)        (579)
  Policyowner dividends paid......................     (2,639)      (2,347)      (2,105)
  Operating expenses and taxes....................     (1,749)      (1,722)      (1,663)
  Other, net......................................        (83)         124          (59)
                                                      --------     --------     --------
    NET CASH PROVIDED BY OPERATING ACTIVITIES.....      4,069        3,835        3,351
                                                      --------     --------     --------
CASH FLOWS FROM INVESTING ACTIVITIES
  PROCEEDS FROM INVESTMENTS SOLD OR MATURED
    Bonds.........................................     28,720       38,284       31,942
    Common and preferred stocks...................     10,359        9,057        4,570
    Mortgage loans................................      1,737        1,012        1,253
    Real estate...................................        159          302          178
    Other investments.............................        768          398          316
                                                      --------     --------     --------
                                                       41,743       49,053       38,259
                                                      --------     --------     --------
  COST OF INVESTMENTS ACQUIRED
    Bonds.........................................     30,873       41,169       35,342
    Common and preferred stocks...................      9,642        9,848        4,463
    Mortgage loans................................      3,135        2,309        2,455
    Real estate...................................        268          202          125
    Other investments.............................        567          359          255
                                                      --------     --------     --------
                                                       44,485       53,887       42,640
                                                      --------     --------     --------
  NET INCREASE (DECREASE) IN SECURITIES LENDING
   AND OTHER......................................       (624)         440        1,617
                                                      --------     --------     --------
    NET CASH USED IN INVESTING ACTIVITIES.........     (3,366)      (4,394)      (2,764)
                                                      --------     --------     --------
NET INCREASE (DECREASE) IN CASH AND TEMPORARY
 INVESTMENTS......................................        703         (559)         587
CASH AND TEMPORARY INVESTMENTS, BEGINNING OF
 YEAR.............................................        572        1,131          544
                                                      --------     --------     --------
CASH AND TEMPORARY INVESTMENTS, END OF YEAR.......    $ 1,275      $   572      $ 1,131
                                                      --------     --------     --------
                                                      --------     --------     --------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                       --
                                       33
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
NOTES TO CONSOLIDATED STATUTORY FINANCIAL STATEMENTS
 
DECEMBER 31, 1998, 1997 AND 1996
 
1. PRINCIPAL ACCOUNTING POLICIES
 
The accompanying consolidated statutory financial statements include the
accounts of The Northwestern Mutual Life Insurance Company ("Company") and its
wholly-owned life insurance subsidiary, Northwestern Long Term Care Insurance
Company ("Subsidiary"). The Company and its Subsidiary offer life, annuity,
disability income and long term care products to the personal, business, estate
and tax-qualified markets.
 
The consolidated financial statements have been prepared using accounting
policies prescribed or permitted by the Office of the Commissioner of Insurance
of the State of Wisconsin ("statutory basis of accounting").
 
In 1998, the National Association of Insurance Commissioners ("NAIC") adopted
the Codification of Statutory Accounting Principles, which will replace the
current Accounting Practices and Procedures manual as the NAIC's primary
guidance on statutory accounting. The NAIC is now considering amendments to the
codification guidance that would also be effective upon its planned
implementation effective January 1, 2001. It is expected that the Office of the
Commissioner of Insurance of the State of Wisconsin ("OCI") will adopt the
codification, but it is not known whether the OCI will make any changes to that
guidance. The potential effect of the codification on the Company will depend
upon the guidance adopted by the OCI.
 
Financial statements prepared on the statutory basis of accounting vary from
financial statements prepared on the basis of Generally Accepted Accounting
Principles ("GAAP") primarily because on a GAAP basis (1) policy acquisition
costs are deferred and amortized, (2) investment valuations and insurance
reserves are based on different assumptions, (3) funds received under
deposit-type contracts are not reported as premium revenue, and (4) deferred
taxes are provided for temporary differences between book and tax basis of
certain assets and liabilities. The effects on the financial statements of the
differences between the statutory basis of accounting and GAAP are material to
the Company.
 
The preparation of financial statements in conformity with the statutory basis
of accounting requires management to make estimates and assumptions that affect
the reported amounts of assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual future results could differ from these estimates.
 
INVESTMENTS
 
The Company's investments are valued on the following bases:
 
<TABLE>
<S>                             <C>  <C>
Bonds                           --   Amortized cost using the interest method; loan-backed and
                                     structured securities are amortized using estimated
                                     prepayment rates and, generally, the prospective adjustment
                                     method
Common and preferred stocks     --   Common stocks are carried at fair value, preferred stocks
                                     are generally carried at cost, and unconsolidated
                                     subsidiaries are recorded using the equity method
Mortgage loans                  --   Amortized cost
Real estate                     --   Lower of cost, less depreciation and encumbrances, or
                                     estimated net realizable value
Policy loans                    --   Unpaid principal balance, which approximates fair value
Other investments               --   Consists primarily of joint venture investments which are
                                     valued at equity in ventures' net assets
Cash and temporary investments  --   Amortized cost, which approximates fair value
</TABLE>
 
                                       --
                                       34
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
NOTES TO CONSOLIDATED STATUTORY FINANCIAL STATEMENTS
 
DECEMBER 31, 1998, 1997 AND 1996
 
TEMPORARY INVESTMENTS
 
Temporary investments consist of debt securities that have maturities of one
year or less at acquisition.
 
NET INVESTMENT INCOME
 
Net investment income includes interest and dividends received or due and
accrued on debt securities and stocks, equity in unconsolidated subsidiaries'
earnings and the Company's share of joint venture income. Net investment income
is reduced by investment management expenses, real estate depreciation,
depletion related to energy assets and costs associated with securities lending.
 
INTEREST MAINTENANCE RESERVE
 
The Company is required to maintain an interest maintenance reserve ("IMR"). The
IMR is used to defer realized gains and losses, net of tax, on fixed income
investments resulting from changes in interest rates. Net realized gains and
losses deferred to the IMR are amortized into investment income over the
approximate remaining term to maturity of the investment sold.
 
INVESTMENT RESERVES
 
The Company is required to maintain an asset valuation reserve ("AVR"). The AVR
establishes a general reserve for invested asset valuation using a formula
prescribed by state regulations. The AVR is designed to stabilize surplus
against potential declines in the value of investments. In addition, the Company
maintained a $200 million voluntary investment reserve at December 31, 1998 and
1997 to absorb potential investment losses exceeding those considered by the AVR
formula. Increases or decreases in these investment reserves are recorded
directly to surplus.
 
SEPARATE ACCOUNTS
 
Separate account assets and related policy liabilities represent the segregation
of funds deposited by "variable" life insurance and annuity policyowners.
Policyowners bear the investment performance risk associated with variable
products. Separate account assets are invested at the direction of the
policyowner in a variety of Company-managed mutual funds. Variable product
policyowners also have the option to invest in a fixed interest rate annuity in
the general account of the Company. Separate account assets are reported at fair
value.
 
PREMIUM REVENUE AND OPERATING EXPENSES
 
Life insurance premiums are recognized as revenue at the beginning of each
policy year. Annuity and disability income premiums are recognized when received
by the Company. Operating expenses, including costs of acquiring new policies,
are charged to operations as incurred.
 
OTHER INCOME
 
Other income includes considerations on supplementary contracts, ceded
reinsurance expense allowances and miscellaneous policy charges.
 
                                       --
                                       35
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
NOTES TO CONSOLIDATED STATUTORY FINANCIAL STATEMENTS
 
DECEMBER 31, 1998, 1997 AND 1996
 
BENEFIT PAYMENTS TO POLICYOWNERS AND BENEFICIARIES
 
Benefit payments to policyowners and beneficiaries include death, surrender and
disability benefits, matured endowments and supplementary contract payments.
 
RESERVES FOR POLICY BENEFITS
 
Reserves for policy benefits are determined using actuarial estimates based on
mortality and morbidity experience tables and valuation interest rates
prescribed by the Office of the Commissioner of Insurance of the State of
Wisconsin. See Note 3.
 
POLICYOWNER DIVIDENDS
 
Almost all life insurance policies, and certain annuity and disability income
policies, issued by the Company are participating. Annually, the Company's Board
of Trustees approves dividends payable on participating policies in the
following fiscal year, which are accrued and charged to operations when
approved.
 
RECLASSIFICATION
 
Certain financial statement balances for 1997 and 1996 have been reclassified to
conform to the current year presentation.
 
2. INVESTMENTS
 
DEBT SECURITIES
 
Debt securities consist of all bonds and fixed-maturity preferred stocks. The
estimated fair values of debt securities are based upon quoted market prices, if
available. For securities not actively traded, fair values are estimated using
independent pricing services or internally developed pricing models. The Company
records unrealized losses for debt securities considered impaired.
 
                                       --
                                       36
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
NOTES TO CONSOLIDATED STATUTORY FINANCIAL STATEMENTS
 
DECEMBER 31, 1998, 1997 AND 1996
 
Statement value, which principally represents amortized cost, and estimated fair
value of the Company's debt securities at December 31, 1998 and 1997 were as
follows:
<TABLE>
<CAPTION>
                                                                RECONCILIATION TO ESTIMATED FAIR VALUE
                                                                ---------------------------------------
                                                                   GROSS          GROSS       ESTIMATED
                                                    STATEMENT    UNREALIZED     UNREALIZED      FAIR
DECEMBER 31, 1998                                     VALUE     APPRECIATION   DEPRECIATION     VALUE
- --------------------------------------------------  ---------   ------------   ------------   ---------
                                                                       (IN MILLIONS)
<S>                                                 <C>         <C>            <C>            <C>
US Government and political obligations...........  $ 3,904       $  461          $ (11)      $ 4,354
Mortgage-backed securities........................    7,357          280            (15)        7,622
Corporate and other debt securities...............   23,627        1,240           (382)       24,485
                                                    ---------   ------------     ------       ---------
                                                     34,888        1,981           (408)       36,461
Preferred stocks..................................      189            4             (1)          192
                                                    ---------   ------------     ------       ---------
Total.............................................  $35,077       $1,985          $(409)      $36,653
                                                    ---------   ------------     ------       ---------
                                                    ---------   ------------     ------       ---------
 
<CAPTION>
 
                                                                RECONCILIATION TO ESTIMATED FAIR VALUE
                                                                ---------------------------------------
                                                                   GROSS          GROSS       ESTIMATED
                                                    STATEMENT    UNREALIZED     UNREALIZED      FAIR
DECEMBER 31, 1997                                     VALUE     APPRECIATION   DEPRECIATION     VALUE
- --------------------------------------------------  ---------   ------------   ------------   ---------
                                                                       (IN MILLIONS)
<S>                                                 <C>         <C>            <C>            <C>
US Government and political obligations...........  $ 3,695       $  336          $  (3)      $ 4,028
Mortgage-backed securities........................    7,015          264             (4)        7,275
Corporate and other debt securities...............   21,649        1,098           (208)       22,539
                                                    ---------   ------------     ------       ---------
                                                     32,359        1,698           (215)       33,842
Preferred stocks..................................      167            4             (2)          169
                                                    ---------   ------------     ------       ---------
Total.............................................  $32,526       $1,702          $(217)      $34,011
                                                    ---------   ------------     ------       ---------
                                                    ---------   ------------     ------       ---------
</TABLE>
 
The statement value of debt securities by contractual maturity at December 31,
1998 and 1997 is shown below. Expected maturities may differ from contractual
maturities because borrowers may have the right to call or prepay obligations
with or without call or prepayment penalties.
 
<TABLE>
<CAPTION>
                                                    DECEMBER 31,   DECEMBER 31,
                                                        1998           1997
                                                    ------------   ------------
                                                           (IN MILLIONS)
<S>                                                 <C>            <C>
Due in one year or less...........................    $   655        $   605
Due after one year through five years.............      5,031          4,878
Due after five years through ten years............     10,286          9,760
Due after ten years...............................     11,748         10,268
                                                    ------------   ------------
                                                       27,720         25,511
Mortgage-backed securities........................      7,357          7,015
                                                    ------------   ------------
                                                      $35,077        $32,526
                                                    ------------   ------------
                                                    ------------   ------------
</TABLE>
 
STOCKS
 
The estimated fair values of common and perpetual preferred stocks are based
upon quoted market prices, if available. For securities not actively traded,
fair values are estimated using independent pricing services or internally
developed pricing models.
 
                                       --
                                       37
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
NOTES TO CONSOLIDATED STATUTORY FINANCIAL STATEMENTS
 
DECEMBER 31, 1998, 1997 AND 1996
 
The adjusted cost of common and preferred stock held by the Company at December
31, 1998 and 1997 was $4.8 billion and $5.0 billion, respectively.
 
MORTGAGE LOANS AND REAL ESTATE
 
Mortgage loans are collateralized by properties located throughout the United
States and Canada. The Company attempts to minimize mortgage loan investment
risk by diversification of geographic locations and types of collateral
properties.
 
The fair value of mortgage loans as of December 31, 1998 and 1997 was
approximately $12.9 billion and $11.5 billion, respectively. The fair value of
the mortgage loan portfolio is estimated by discounting the future estimated
cash flows using current interest rates of debt securities with similar credit
risk and maturities, or utilizing net realizable values.
 
At December 31, 1998 and 1997, real estate includes $61 million acquired through
foreclosure at each date and $120 million and $124 million, respectively, of
home office real estate. In 1998, 1997 and 1996, the Company recorded unrealized
losses of $5 million, $2 million and $43 million, respectively, for the excess
of statement value over fair value of certain real estate investments and
mortgage loans.
 
REALIZED GAINS AND LOSSES
 
Realized investment gains and losses for the years ended December 31, 1998, 1997
and 1996 were as follows:
 
<TABLE>
<CAPTION>
                                      FOR THE YEAR ENDED               FOR THE YEAR ENDED               FOR THE YEAR ENDED
                                      DECEMBER 31, 1998                DECEMBER 31, 1997                DECEMBER 31, 1996
                                ------------------------------   ------------------------------   ------------------------------
                                                        NET                              NET                              NET
                                                      REALIZED                         REALIZED                         REALIZED
                                REALIZED   REALIZED    GAINS     REALIZED   REALIZED    GAINS     REALIZED   REALIZED    GAINS
                                 GAINS      LOSSES    (LOSSES)    GAINS      LOSSES    (LOSSES)    GAINS      LOSSES    (LOSSES)
                                --------   --------   --------   --------   --------   --------   --------   --------   --------
                                                                         (IN MILLIONS)
<S>                             <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Bonds.........................  $   514     $ (231)    $  283    $   518     $ (269)    $ 249     $   396     $ (383)    $   13
Common and preferred stocks...      885       (240)       645        533       (150)      383         580       (115)       465
Mortgage loans................       18        (11)         7         14        (14)        -           2        (15)       (13)
Real estate...................       41          -         41        100         (2)       98          36          -         36
Other investments.............      330       (267)        63        338       (105)      233         204        (51)       153
                                --------   --------   --------   --------   --------   --------   --------   --------   --------
                                  1,788       (749)     1,039      1,503       (540)      963       1,218       (564)       654
                                --------   --------   --------   --------   --------   --------   --------   --------   --------
Less: Capital gains taxes.....                            358                             340                               224
Less: IMR deferrals...........                            197                             209                                35
                                                      --------                         --------                         --------
Net realized capital gains....                         $  484                           $ 414                            $  395
                                                      --------                         --------                         --------
                                                      --------                         --------                         --------
</TABLE>
 
SECURITIES LENDING
 
The Company has entered into a securities lending agreement whereby certain
securities are loaned to third parties, primarily major brokerage firms. The
Company's policy requires a minimum of 102 percent of the fair value of the
loaned securities as collateral, calculated on a daily basis in the form of
either cash or securities. Collateral assets received and related liability due
to counterparties of $1.5 billion are included in the consolidated
 
                                       --
                                       38
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
NOTES TO CONSOLIDATED STATUTORY FINANCIAL STATEMENTS
 
DECEMBER 31, 1998, 1997 AND 1996
 
statements of financial position for each of the periods ended at December 31,
1998 and 1997, and approximate the statement value of securities loaned at those
dates.
 
INVESTMENT IN MGIC
 
The Company owns 11.0% (11.9 million shares) of the outstanding common stock of
MGIC Investment Corporation ("MGIC"). This investment is accounted for using the
equity method. At December 31, 1998 and 1997, the fair value of the Company's
investment in MGIC exceeded the statement value of $180 million and $273
million, respectively, by $296 million and $768 million, respectively.
 
In July 1995, the Company entered into a forward contract with a brokerage firm
to deliver 8.9 million to 10.7 million shares of MGIC (or cash in an amount
equal to the market value of the MGIC shares at contract maturity) in August,
1998, in exchange for a fixed cash payment of $247 million ($24 per share). The
Company's objective in entering into the forward contract was to hedge against
depreciation in the value of its MGIC holdings during the contract period below
the initial spot price of $24, while partially participating in appreciation, if
any, during the forward contract's duration. In August 1998, the Company
delivered 8.9 million shares to settle the forward contract. In conjunction with
the settlement, the Company recorded a $114 million realized gain.
 
DERIVATIVE FINANCIAL INSTRUMENTS
 
In the normal course of business, the Company enters into transactions to reduce
its exposure to fluctuations in interest rates, foreign currency exchange rates
and market volatility. These hedging strategies include the use of forwards,
futures, options and swaps.
 
The Company held the following positions for hedging purposes at December 31,
1998 and 1997:
 
<TABLE>
<CAPTION>
DERIVATIVE FINANCIAL INSTRUMENT                         NOTIONAL AMOUNTS                          RISKS REDUCED
- -------------------------------------------  ---------------------------------------   -----------------------------------
                                                          (IN MILLIONS)
                                                DECEMBER 31,
                                                    1998          DECEMBER 31, 1997
                                             ------------------   ------------------
<S>                                          <C>                  <C>                  <C>
Foreign Currency Forward                                                               Currency exposure on
 Contracts.................................         $601                 $564          foreign-denominated investments.
Common Stock Futures.......................          657                  327          Stock market price fluctuation.
Bond Futures...............................          379                   95          Bond market price fluctuation.
Options to acquire Interest Rate Swaps.....          419                  530          Interest rates payable on certain
                                                                                       annuity and insurance contracts.
Foreign Currency and Interest Rate Swaps...           94                  209          Interest rates on variable rate
                                                                                       notes and currency exposure on
                                                                                       foreign-denominated bonds.
</TABLE>
 
The notional or contractual amounts of derivative financial instruments are used
to denominate these types of transactions and do not represent the amounts
exchanged between the parties.
 
In addition to the use of derivatives for hedging purposes, equity swaps were
held for investment purposes during 1997 and 1998. The notional amount of equity
swaps outstanding at December 31, 1998 and 1997 was $188 million and $143
million, respectively.
 
Foreign currency forwards, foreign currency swaps, stock futures and equity
swaps are reported at fair value. Resulting gains and losses on these contracts
are unrealized until expiration of the contract. There is no statement
 
                                       --
                                       39
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
NOTES TO CONSOLIDATED STATUTORY FINANCIAL STATEMENTS
 
DECEMBER 31, 1998, 1997 AND 1996
 
value reported for interest rate swaps, bond futures and options to acquire
interest rate swaps prior to the settlement of the contract, at which time
realized gains and losses are deferred to IMR. Changes in the value of
derivative instruments are expected to offset gains and losses on the hedged
investments. During 1998, net realized and unrealized gains on investments were
partially offset by net realized losses of $104 million and net unrealized
losses of $58 million on derivative instruments. The effect of derivative
instruments in 1997 and 1996 was not material to the Company's results of
operations.
 
3. RESERVES FOR POLICY BENEFITS
 
Life insurance reserves on substantially all policies issued since 1978 are
based on the Commissioner's Reserve Valuation Method with interest rates ranging
from 3 1/2% to 5 1/2%. Other life policy reserves are primarily based on the net
level premium method employing various mortality tables at interest rates
ranging from 2% to 4 1/2%.
 
Deferred annuity reserves on contracts issued since 1985 are valued primarily
using the Commissioner's Annuity Reserve Valuation Method with interest rates
ranging from 3 1/2% to 6 1/4%. Other deferred annuity reserves are based on
contract value. Immediate annuity reserves are based on present values of
expected benefit payments at interest rates ranging from 3 1/2% to 7 1/2%.
 
Active life reserves for disability income ("DI") policies issued since 1987 are
primarily based on the two-year preliminary term method using a 4% interest rate
and the 1985 Commissioner's Individual Disability Table A ("CIDA") for
morbidity. Active life reserves for prior DI policies are based on the net level
premium method, a 3% to 4% interest rate and the 1964 Commissioner's Disability
Table for morbidity. Disabled life reserves for DI policies are based on the
present values of expected benefit payments primarily using the 1985 CIDA
(modified for Company experience in the first two years of disability) with
interest rates ranging from 3% to 5 1/2%.
 
Use of these actuarial tables and methods involves estimation of future
mortality and morbidity based on past experience. Actual future experience could
differ from these estimates.
 
4. EMPLOYEE AND AGENT BENEFIT PLANS
 
The Company sponsors noncontributory defined benefit retirement plans for all
eligible employees and agents. The expense associated with these plans is
generally recorded by the Company in the period contributions to the plans are
funded. As of January 1, 1998, the most recent actuarial valuation date
available, the qualified defined benefit plans were fully funded. The Company
recorded a liability of $98 million and $87 million for nonqualified defined
benefit plans at December 31, 1998 and 1997, respectively. In addition, the
Company has a contributory 401(k) plan for eligible employees and a
noncontributory defined contribution plan for all full-time agents. The
Company's contributions are expensed in the period contributions are made to the
plans. The Company recorded $29 million, $27 million and $25 million of total
expense related to its defined benefit and defined contribution plans for the
years ended December 31, 1998, 1997 and 1996, respectively. The defined benefit
and defined contribution plans' assets of $1.9 billion and $1.7 billion at
December 31, 1998 and 1997, respectively, were primarily invested in the
separate accounts of the Company.
 
In addition to pension and retirement benefits, the Company provides certain
health care and life insurance benefits ("postretirement benefits") for retired
employees. Substantially all employees may become eligible for these benefits if
they reach retirement age while working for the Company. Postretirement benefit
costs for the years ended December 31, 1998, 1997 and 1996 were a net expense
(benefit) of $1.8 million, ($1.3) million and
 
                                       --
                                       40
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
NOTES TO CONSOLIDATED STATUTORY FINANCIAL STATEMENTS
 
DECEMBER 31, 1998, 1997 AND 1996
 
($12.0) million, respectively. Net benefits were primarily a result of favorable
differences between actuarial assumptions and actual experience.
 
<TABLE>
<CAPTION>
                                    DECEMBER 31,          DECEMBER 31,
                                        1998                  1997
                                --------------------  --------------------
<S>                             <C>                   <C>
Unfunded postretirement
 benefit obligation for
 retirees and other fully
 eligible employees (Accrued
 in statement of financial
 position)....................  $35 million           $34 million
Estimated postretirement
 benefit obligation for active
 non-vested employees (Not
 accrued until employee
 vests).......................  $56 million           $50 million
Discount rate.................  7%                    7%
Health care cost trend rate...  10% to an ultimate    10% to an ultimate
                                5%, declining 1% for  5%, declining 1% for
                                5 years               5 years
</TABLE>
 
If the health care cost trend rate assumptions were increased by 1%, the accrued
postretirement benefit obligation as of December 31, 1998 and 1997 would have
been increased by $5 million and $4 million, respectively.
 
At December 31, 1998 and 1997, the recorded postretirement benefit obligation
was reduced by $23 million and $20 million, respectively, for assets funded for
postretirement health care benefits.
 
5. REINSURANCE
 
In the normal course of business, the Company seeks to limit its exposure to
loss on any single insured and to recover a portion of benefits paid by ceding
to reinsurers under excess coverage and coinsurance contracts. The Company
retains a maximum of $25 million of coverage per individual life and $35 million
maximum of coverage per joint life. The Company has an excess reinsurance
contract for disability income policies with retention limits varying based upon
on coverage type.
 
The amounts shown in the accompanying consolidated financial statements are net
of reinsurance. Policy benefit reserves at December 31, 1998 and 1997 were
reported net of ceded reserves of $518 million and $435 million, respectively.
The effect of reinsurance on premiums and benefits for the years ended December
31, 1998, 1997 and 1996 was as follows:
 
<TABLE>
<CAPTION>
                                                     1998      1997      1996
                                                    -------   -------   -------
                                                           (IN MILLIONS)
<S>                                                 <C>       <C>       <C>
Direct premiums...................................  $8,426    $7,647    $7,064
Premiums ceded....................................    (405)     (353)     (397)
                                                    -------   -------   -------
Net premium revenue...............................  $8,021    $7,294    $6,667
                                                    -------   -------   -------
                                                    -------   -------   -------
Benefits to policyowners and beneficiaries........  $8,869    $8,057    $7,348
Benefits ceded....................................    (182)     (136)     (147)
                                                    -------   -------   -------
Net benefits to policyowners and beneficiaries....  $8,687    $7,921    $7,201
                                                    -------   -------   -------
                                                    -------   -------   -------
</TABLE>
 
                                       --
                                       41
<PAGE>
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
 
NOTES TO CONSOLIDATED STATUTORY FINANCIAL STATEMENTS
 
DECEMBER 31, 1998, 1997 AND 1996
 
In addition, the Company received $121 million, $115 million and $93 million for
the years ended December 31, 1998, 1997 and 1996, respectively, from reinsurers
representing allowances for reimbursement of commissions and other expenses.
These amounts are included in other income in the consolidated statement of
operations.
 
Reinsurance contracts do not relieve the Company from its obligations to
policyowners. Failure of reinsurers to honor their obligations could result in
losses to the Company; consequently, allowances are established for amounts
deemed uncollectible. The Company evaluates the financial condition of its
reinsurers and monitors concentrations of credit risk arising from similar
geographic regions, activities or economic characteristics of the reinsurers to
minimize its exposure to significant losses from reinsurer insolvencies.
 
6. INCOME TAXES
 
Provisions for income taxes are based on current income tax payable without
recognition of deferred taxes. The Company files a consolidated life-nonlife
federal income tax return. Federal income tax returns for years through 1988 are
closed as to further assessment of tax. Adequate provision has been made in the
financial statements for any additional taxes which may become due with respect
to the open years.
 
The Company's effective tax rate on gains from operations before taxes for the
years ended December 31, 1998, 1997 and 1996 was 48%, 56%, and 67% respectively.
The Company's effective tax rate exceeds the federal corporate rate of 35%
primarily because, (1) the Company pays a tax that is assessed only on the
surplus of mutual life insurance companies ("equity tax"), and (2) the Company
must capitalize and amortize (as opposed to immediately deducting) an amount
deemed to represent the cost of acquiring new business ("DAC tax").
 
7. ACQUISITION OF FRANK RUSSELL COMPANY
 
Pursuant to an Agreement and Plan of Merger, dated as of August 10, 1998, the
Company acquired Frank Russell Company effective January 1, 1999 for a purchase
price of approximately $950 million. Frank Russell is a leading investment
management and consulting firm, providing investment advice, analytical tools
and investment vehicles to institutional and individual investors in more than
30 countries.
 
In connection with its acquisition of Frank Russell Company, the Company will be
required in 1999 to charge-off directly from surplus approximately $341 million,
which represents the amount of acquisition goodwill less 10% of the Company's
surplus at December 31, 1998. In addition, the Company will request permission
from the OCI to charge-off the remaining $474 million of acquisition goodwill in
1999 and currently intends to do so.
 
In connection with the acquisition, the Company has unconditionally guaranteed
certain debt obligations of Frank Russell Company, including $350 million of
senior notes and up to $150 million of other credit facilities.
 
8. CONTINGENCIES
 
The Company has guaranteed certain obligations of its affiliates. These
guarantees totaled approximately $133 million at December 31, 1998 and are
generally supported by the underlying net asset values of the affiliates.
 
In addition, the Company routinely makes commitments to fund mortgage loans or
other investments in the normal course of business. These commitments aggregated
to $2.1 billion at December 31, 1998 and were extended at market interest rates
and terms.
 
The Company is engaged in various legal actions in the normal course of its
investment and insurance operations. In the opinion of management, any losses
resulting from such actions would not have a material effect on the Company's
financial position.
 
                                       --
                                       42
<PAGE>
                               [LETTERHEAD]
 
REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Trustees and Policyowners of
The Northwestern Mutual Life Insurance Company
 
We have audited the accompanying consolidated statement of financial position of
The Northwestern Mutual Life Insurance Company and its subsidiary as of December
31, 1998 and 1997, and the related consolidated statements of operations, of
changes in surplus and of cash flows for each of the three years in the period
ended December 31, 1998. These consolidated financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these consolidated financial statements based on our audits.
 
We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
As described in Note 1, these consolidated financial statements were prepared in
conformity with accounting practices prescribed or permitted by the Office of
the Commissioner of Insurance of the State of Wisconsin (statutory basis of
accounting), which practices differ from generally accepted accounting
principles. Accordingly, the consolidated financial statements are not intended
to represent a presentation in accordance with generally accepted accounting
principles. The effects on the consolidated financial statements of the
variances between the statutory basis of accounting and generally accepted
accounting principles, although not reasonably determinable, are presumed to be
material.
 
In our opinion, the consolidated financial statements audited by us (1) do not
present fairly in conformity with generally accepted accounting principles, the
financial position of The Northwestern Mutual Life Insurance Company and its
subsidiary at December 31, 1998 and 1997, or the results of their operations or
their cash flows for each of the three years in the period ended December 31,
1998 because of the effects of the variances between the statutory basis of
accounting and generally accepted accounting principles referred to in the
preceding paragraph and (2) do present fairly, in all material respects, the
financial position of The Northwestern Mutual Life Insurance Company and its
subsidiary at December 31, 1998 and 1997 and the results of their operations and
their cash flows for each of the three years in the period ended December 31,
1998, on the basis of accounting described in Note 1.
 
/s/ PricewaterhouseCoopers LLP
 
January 25, 1999
 
                                       --
                                       43
<PAGE>
APPENDIX
 
ILLUSTRATIONS OF DEATH BENEFITS, CASH VALUES AND ACCUMULATED PREMIUMS.  The
tables on the following pages illustrate how the death benefit and cash value
for a Policy would vary over time based on hypothetical investment results. The
tables assume gross (after tax) investment return rates of 0%, 6% and 12% on
assets of the Account. The Policies illustrated are for male insureds, select
risks, age 35. The first two illustrations, on pages 45-46, are for a policy
with a Minimum Guaranteed Death Benefit of $200,000 and no Additional
Protection, based (1) on current charges and the current dividend scale and (2)
on maximum charges and zero dividends. The other two illustrations are for a
Policy with a Minimum Guaranteed Death Benefit of $200,000 and Additional
Protection of $200,000.
 
The death benefits and cash values would be different from those shown if the
gross investment return rate averaged 0%, 6% or 12%, but fluctuated over and
under the average rate at various points in time. The values would also be
different, depending on the Account divisions selected by the owner of the
Policy, if the Portfolios or Funds return rate averaged 0%, 6% or 12%, but the
rates for each individual Portfolio or Fund varied over and under the average.
 
The amounts shown as the death benefits and cash values reflect the deductions
from premiums, deductions from Policy Value and the charge at the annual rate of
 .60% of the Account's assets for mortality and expense risks. The amounts shown
as the cash values reflect the deduction of the surrender charge during the
first fifteen Policy years. The amounts shown also reflect the average of the
investment advisory fees and other expenses applicable to each of the Portfolios
and Funds at the annual rate of .66% of their net assets. In calculating this
average rate we used the actual expenses for 1998 for the nine Portfolios which
were in operation, and estimated expense ratios which we expect the two new
Portfolios and five Funds to incur in 1999 on an annualized basis. See "The
Funds", p. 5. Thus the 0%, 6% and 12% gross hypothetical return rates on the
Fund's assets are equivalent to the net rates of -1.26%, 4.74% and 10.74% on the
assets of the Account.
 
The second column of each table shows the amount which would accumulate if an
amount equal to the annual premium were invested to earn interest, after taxes,
at a 5% interest rate compounded annually.
 
The death benefits and corresponding cash values shown on pages 45 and 47
illustrate benefits which we would pay if investment returns of 0%, 6% and 12%
are realized, if mortality and expense experience in the future is as currently
experienced and if the current dividend scale remains unchanged. See "Annual
Dividends," p. 14. HOWEVER, THERE IS NO GUARANTEE AS TO THE AMOUNT OF DIVIDENDS,
IF ANY, THAT WE WILL PAY UNDER A POLICY. Although the tables are based on the
assumption that dividends will be used to increase the Policy Value, other
dividend options are available. The use of dividends for other purposes during
the guaranteed period for Additional Protection may cause the guaranteed period
to terminate. See "Death Benefit", p. 10.
 
We will prepare a comparable illustration based on a proposed insured's age, sex
and risk classification and proposed face amount or premium upon request.
 
                                       --
                                       44
<PAGE>
        VARIABLE WHOLE LIFE WITH ADDITIONAL PROTECTION INSURANCE POLICY
                 MALE ISSUE AGE 35 -- SELECT UNDERWRITING RISK
             $200,000 VARIABLE WHOLE LIFE, $0 ADDITIONAL PROTECTION
                           $2,610 ANNUAL PREMIUM (1)
                     CURRENT CHARGES AND DIVIDEND SCALE (2)
                    DIVIDENDS USED TO INCREASE POLICY VALUE
 
<TABLE>
<CAPTION>
                                                DEATH BENEFIT (3)                 CASH SURRENDER VALUE (3)
                                       ------------------------------------  -----------------------------------
                           PREMIUM
                         ACCUMULATED       ASSUMING HYPOTHETICAL GROSS           ASSUMING HYPOTHETICAL GROSS
                            AT 5%          ANNUAL INVESTMENT RETURN OF           ANNUAL INVESTMENT RETURN OF
        END OF          INTEREST PER   ------------------------------------  -----------------------------------
     POLICY YEAR            YEAR           0%          6%          12%          0%          6%          12%
- ----------------------  -------------  ----------  ----------  ------------  ---------  ----------  ------------
<S>                     <C>            <C>         <C>         <C>           <C>        <C>         <C>
1.....................   $     2,741   $  200,000  $  200,021  $    200,139  $     901  $    1,019  $      1,136
2.....................         5,618      200,000     200,060       200,431      2,752       3,109         3,480
3.....................         8,639      200,000     200,118       200,899      4,561       5,284         6,064
4.....................        11,812      200,000     200,195       201,564      6,329       7,547         8,917
5.....................        15,143      200,000     200,294       202,456      8,051       9,899        12,062
6.....................        18,641      200,000     200,411       203,598      9,824      12,442        15,630
7.....................        22,313      200,000     200,556       205,033     11,549      15,080        19,556
8.....................        26,169      200,000     200,734       206,799     13,228      17,820        23,884
9.....................        30,218      200,000     200,951       208,943     14,862      20,669        28,661
10....................        34,470      200,000     201,211       211,515     16,457      23,637        33,940
15....................        59,136      200,000     204,524       234,256     25,567      42,344        72,076
20....................        90,617      200,000     211,868       311,403     33,818      65,864       136,024
25....................       130,796      200,000     223,245       478,073     40,168      94,823       241,250
30 (age 65)...........       182,076      200,000     240,400       715,956     43,890     130,508       412,469
35....................       247,523      200,000     269,334     1,062,685     43,553     174,483       688,439
40....................       331,052      200,000     316,374     1,569,971     34,736     226,644     1,124,696
45....................       437,658      200,000     368,476     2,317,209      7,349     286,166     1,799,591
</TABLE>
 
(1) If premiums are paid more frequently than annually the payments would be
    $1,331.41 semiannually, $673.55 quarterly, or $225.74 monthly.
 
(2) Dividends illustrated are based on current scale and experience and are not
    guaranteed.
 
(3) Assumes no policy loan has been made.
 
IT IS EMPHASIZED THAT THE HYPOTHETICAL INVESTMENT RESULTS ARE ILLUSTRATIVE ONLY
AND SHOULD NOT BE DEEMED A REPRESENTATION OF PAST OR FUTURE INVESTMENT RESULTS.
ACTUAL INVESTMENT RESULTS MAY BE MORE OR LESS THAN THOSE SHOWN AND WILL DEPEND
UPON A NUMBER OF FACTORS, INCLUDING THE INVESTMENT ALLOCATIONS MADE BY AN OWNER
AND THE DIFFERENT RATES OF RETURN OF THE FUND PORTFOLIOS. THE DEATH BENEFIT AND
CASH VALUE FOR A POLICY WOULD BE DIFFERENT FROM THOSE SHOWN IF THE ACTUAL
INVESTMENT RATES OF RETURN AVERAGED 0%, 6% AND 12% OVER A PERIOD OF YEARS, BUT
FLUCTUATED ABOVE OR BELOW THOSE AVERAGES FOR INDIVIDUAL POLICY YEARS. NO
REPRESENTATIONS CAN BE MADE THAT THESE HYPOTHETICAL RATES OF RETURN CAN BE
ACHIEVED FOR ANY ONE YEAR OR SUSTAINED OVER A PERIOD OF TIME.
 
                                       --
                                       45
<PAGE>
        VARIABLE WHOLE LIFE WITH ADDITIONAL PROTECTION INSURANCE POLICY
                   MALE ISSUE AGE 35 -- SELECT UNDERWRITING RISK
               $200,000 VARIABLE WHOLE LIFE, $0 ADDITIONAL PROTECTION
                             $2,610 ANNUAL PREMIUM (1)
                         MAXIMUM CHARGES AND ZERO DIVIDENDS
 
<TABLE>
<CAPTION>
                                                DEATH BENEFIT (2)                 CASH SURRENDER VALUE (2)
                                       ------------------------------------  -----------------------------------
                           PREMIUM
                         ACCUMULATED       ASSUMING HYPOTHETICAL GROSS           ASSUMING HYPOTHETICAL GROSS
                            AT 5%          ANNUAL INVESTMENT RETURN OF           ANNUAL INVESTMENT RETURN OF
        END OF          INTEREST PER   ------------------------------------  -----------------------------------
     POLICY YEAR            YEAR           0%          6%          12%          0%          6%          12%
- ----------------------  -------------  ----------  ----------  ------------  ---------  ----------  ------------
<S>                     <C>            <C>         <C>         <C>           <C>        <C>         <C>
1.....................   $     2,741   $  200,000  $  200,014  $    200,132  $     895  $    1,012  $      1,130
2.....................         5,618      200,000     200,046       200,416      2,739       3,095         3,465
3.....................         8,639      200,000     200,096       200,872      4,542       5,262         6,038
4.....................        11,812      200,000     200,162       201,521      6,304       7,514         8,873
5.....................        15,143      200,000     200,249       202,390      8,021       9,854        11,996
6.....................        18,641      200,000     200,354       203,504      9,794      12,386        15,536
7.....................        22,313      200,000     200,484       204,897     11,516      15,007        19,421
8.....................        26,169      200,000     200,638       206,605     13,190      17,724        23,691
9.....................        30,218      200,000     200,819       208,663     14,812      20,536        28,381
10....................        34,470      200,000     201,024       211,112     16,381      23,450        33,538
15....................        59,136      200,000     202,537       231,095     24,092      40,357        68,915
20....................        90,617      200,000     205,046       285,062     28,878      59,042       124,518
25....................       130,796      200,000     208,876       420,175     30,617      80,454       212,033
30 (age 65)...........       182,076      200,000     214,415       601,198     27,427     104,523       346,356
35....................       247,523      200,000     222,125       845,898     15,135     130,829       547,998
40....................       331,052      200,000     232,559     1,178,418          0     159,033       844,195
45....................       437,658      200,000     246,356     1,631,754          0     188,446     1,267,253
</TABLE>
 
(1) If premiums are paid more frequently than annually the payments would be
    $1,331.41 semiannually, $673.55 quarterly, or $225.74 monthly.
 
(2) Assumes no policy loan has been made.
 
IT IS EMPHASIZED THAT THE HYPOTHETICAL INVESTMENT RESULTS ARE ILLUSTRATIVE ONLY
AND SHOULD NOT BE DEEMED A REPRESENTATION OF PAST OR FUTURE INVESTMENT RESULTS.
ACTUAL INVESTMENT RESULTS MAY BE MORE OR LESS THAN THOSE SHOWN AND WILL DEPEND
UPON A NUMBER OF FACTORS, INCLUDING THE INVESTMENT ALLOCATIONS MADE BY AN OWNER
AND THE DIFFERENT RATES OF RETURN OF THE FUND PORTFOLIOS. THE DEATH BENEFIT AND
CASH VALUE FOR A POLICY WOULD BE DIFFERENT FROM THOSE SHOWN IF THE ACTUAL
INVESTMENT RATES OF RETURN AVERAGED 0%, 6% AND 12% OVER A PERIOD OF YEARS, BUT
FLUCTUATED ABOVE OR BELOW THOSE AVERAGES FOR INDIVIDUAL POLICY YEARS. NO
REPRESENTATIONS CAN BE MADE THAT THESE HYPOTHETICAL RATES OF RETURN CAN BE
ACHIEVED FOR ANY ONE YEAR OR SUSTAINED OVER A PERIOD OF TIME.
 
                                       --
                                       46
<PAGE>
        VARIABLE WHOLE LIFE WITH ADDITIONAL PROTECTION INSURANCE POLICY
                   MALE ISSUE AGE 35 -- SELECT UNDERWRITING RISK
        $200,000 VARIABLE WHOLE LIFE PLUS $200,000 ADDITIONAL PROTECTION (1)
                             $3,620 ANNUAL PREMIUM (2)
                       CURRENT CHARGES AND DIVIDEND SCALE (3)
                      DIVIDENDS USED TO INCREASE POLICY VALUE
 
<TABLE>
<CAPTION>
                                                DEATH BENEFIT (4)                 CASH SURRENDER VALUE (4)
                                       ------------------------------------  -----------------------------------
                           PREMIUM
                         ACCUMULATED       ASSUMING HYPOTHETICAL GROSS           ASSUMING HYPOTHETICAL GROSS
                            AT 5%          ANNUAL INVESTMENT RETURN OF           ANNUAL INVESTMENT RETURN OF
        END OF          INTEREST PER   ------------------------------------  -----------------------------------
     POLICY YEAR            YEAR           0%          6%          12%          0%          6%          12%
- ----------------------  -------------  ----------  ----------  ------------  ---------  ----------  ------------
<S>                     <C>            <C>         <C>         <C>           <C>        <C>         <C>
1.....................   $     3,801   $  400,000  $  400,000  $    400,000  $   1,343  $    1,495  $      1,648
2.....................         7,792      400,000     400,000       400,000      3,944       4,417         4,908
3.....................        11,983      400,000     400,000       400,000      6,491       7,458         8,503
4.....................        16,383      400,000     400,000       400,000      8,985      10,626        12,469
5.....................        21,003      400,000     400,000       400,000     11,415      13,916        16,839
6.....................        25,854      400,000     400,000       400,000     13,891      17,443        21,767
7.....................        30,948      400,000     400,000       400,000     16,297      21,099        27,187
8.....................        36,296      400,000     400,000       400,000     18,639      24,893        33,160
9.....................        41,912      400,000     400,000       400,000     20,919      28,838        39,752
10....................        47,809      400,000     400,000       401,333     23,147      32,950        47,043
15....................        82,020      400,000     400,000       423,375     35,180      58,140        99,015
20....................       125,684      400,000     400,000       477,445     45,132      88,871       185,437
25....................       181,411      400,000     400,000       651,812     51,120     125,398       328,924
30 (age 65)...........       252,534      395,465     400,000       977,145     51,379     168,832       562,943
35....................       343,307      364,419     403,552     1,451,214     43,843     220,960       940,140
40....................       459,160      330,617     429,362     2,144,716     22,153     282,310     1,536,432
45....................       607,020      211,272     468,606     3,166,179          0     352,786     2,458,917
</TABLE>
 
(1) Additional Protection is guaranteed to be $100,000 for at least 15 years, so
    long as all premiums are paid when due and all dividends are used to
    increase Policy Value.
 
(2) If premiums are paid more frequently than annually the payments would be
    $1,846.10 semiannually, $933.43 quarterly, or $312.91 monthly.
 
(3) Dividends illustrated are based on current scale and experience and are not
    guaranteed.
 
(4) Assumes no policy loan has been made.
 
IT IS EMPHASIZED THAT THE HYPOTHETICAL INVESTMENT RESULTS ARE ILLUSTRATIVE ONLY
AND SHOULD NOT BE DEEMED A REPRESENTATION OF PAST OR FUTURE INVESTMENT RESULTS.
ACTUAL INVESTMENT RESULTS MAY BE MORE OR LESS THAN THOSE SHOWN AND WILL DEPEND
UPON A NUMBER OF FACTORS, INCLUDING THE INVESTMENT ALLOCATIONS MADE BY AN OWNER
AND THE DIFFERENT RATES OF RETURN OF THE FUND PORTFOLIOS. THE DEATH BENEFIT AND
CASH VALUE FOR A POLICY WOULD BE DIFFERENT FROM THOSE SHOWN IF THE ACTUAL
INVESTMENT RATES OF RETURN AVERAGED 0%, 6% AND 12% OVER A PERIOD OF YEARS, BUT
FLUCTUATED ABOVE OR BELOW THOSE AVERAGES FOR INDIVIDUAL POLICY YEARS. NO
REPRESENTATIONS CAN BE MADE THAT THESE HYPOTHETICAL RATES OF RETURN CAN BE
ACHIEVED FOR ANY ONE YEAR OR SUSTAINED OVER A PERIOD OF TIME.
 
                                       --
                                       47
<PAGE>
        VARIABLE WHOLE LIFE WITH ADDITIONAL PROTECTION INSURANCE POLICY
                   MALE ISSUE AGE 35 -- SELECT UNDERWRITING RISK
        $200,000 VARIABLE WHOLE LIFE PLUS $200,000 ADDITIONAL PROTECTION (1)
                             $3,620 ANNUAL PREMIUM (2)
                         MAXIMUM CHARGES AND ZERO DIVIDENDS
 
<TABLE>
<CAPTION>
                                                DEATH BENEFIT (3)                 CASH SURRENDER VALUE (3)
                                       ------------------------------------  -----------------------------------
                           PREMIUM
                         ACCUMULATED       ASSUMING HYPOTHETICAL GROSS           ASSUMING HYPOTHETICAL GROSS
                            AT 5%          ANNUAL INVESTMENT RETURN OF           ANNUAL INVESTMENT RETURN OF
        END OF          INTEREST PER   ------------------------------------  -----------------------------------
     POLICY YEAR            YEAR           0%          6%          12%          0%          6%          12%
- ----------------------  -------------  ----------  ----------  ------------  ---------  ----------  ------------
<S>                     <C>            <C>         <C>         <C>           <C>        <C>         <C>
1.....................   $     3,801   $  400,000  $  400,000  $    400,000  $   1,164  $    1,316  $      1,469
2.....................         7,792      400,000     400,000       400,000      3,571       4,033         4,512
3.....................        11,983      400,000     400,000       400,000      5,911       6,842         7,848
4.....................        16,383      400,000     400,000       400,000      8,181       9,744        11,504
5.....................        21,003      400,000     400,000       400,000     10,375      12,739        15,508
6.....................        25,854      400,000     400,000       400,000     12,606      15,942        20,012
7.....................        30,948      400,000     400,000       400,000     14,749      19,232        24,931
8.....................        36,296      400,000     400,000       400,000     16,806      22,615        30,313
9.....................        41,912      400,000     400,000       400,000     18,768      26,084        36,199
10....................        47,809      400,000     400,000       400,000     20,636      29,647        42,648
15....................        82,020      400,000     400,000       410,613     29,066      49,499        86,253
20....................       125,684      333,952     400,000       445,801     33,673      69,731       153,793
25....................       181,411      283,402     400,000       518,053     35,287      89,532       261,209
30 (age 65)...........       252,534      250,500     400,000       744,954     32,093     105,438       429,175
35....................       343,307      230,680     400,000     1,051,808     20,040     109,608       681,392
40....................       459,160      218,221     227,808     1,468,440          0     131,534     1,051,961
45....................       607,020      211,257     227,808     2,036,184          0     150,474     1,581,341
</TABLE>
 
(1) Additional Protection is guaranteed to be $100,000 for at least 15 years, so
    long as all premiums are paid when due and all dividends are used to
    increase Policy Value.
 
(2) If premiums are paid more frequently than annually the payments would be
    $1,846.10 semiannually, $933.43 quarterly, or $312.91 monthly.
 
(3) Assumes no policy loan has been made.
 
IT IS EMPHASIZED THAT THE HYPOTHETICAL INVESTMENT RESULTS ARE ILLUSTRATIVE ONLY
AND SHOULD NOT BE DEEMED A REPRESENTATION OF PAST OR FUTURE INVESTMENT RESULTS.
ACTUAL INVESTMENT RESULTS MAY BE MORE OR LESS THAN THOSE SHOWN AND WILL DEPEND
UPON A NUMBER OF FACTORS, INCLUDING THE INVESTMENT ALLOCATIONS MADE BY AN OWNER
AND THE DIFFERENT RATES OF RETURN OF THE FUND PORTFOLIOS. THE DEATH BENEFIT AND
CASH VALUE FOR A POLICY WOULD BE DIFFERENT FROM THOSE SHOWN IF THE ACTUAL
INVESTMENT RATES OF RETURN AVERAGED 0%, 6% AND 12% OVER A PERIOD OF YEARS, BUT
FLUCTUATED ABOVE OR BELOW THOSE AVERAGES FOR INDIVIDUAL POLICY YEARS. NO
REPRESENTATIONS CAN BE MADE THAT THESE HYPOTHETICAL RATES OF RETURN CAN BE
ACHIEVED FOR ANY ONE YEAR OR SUSTAINED OVER A PERIOD OF TIME.
 
                                       --
                                       48
<PAGE>

More information about Northwestern Mutual Series Fund, Inc. is included in the
Fund's Statement of Additional Information (SAI), incorporated by reference in
this prospectus, which is available free of charge.

More information about the Fund's investments is included in the Fund's annual
and semi-annual reports, which discuss the market conditions and investment
strategies that significantly affected each Portfolio's performance during the
previous fiscal period.

To request a free copy of the Fund's SAI, or current annual or semi-annual
report, call us at 1-800-519-4665.  Information about the Fund (including the
SAI) can be reviewed and copied at the Public Reference Room of the Securities
and Exchange Commission (SEC) in Washington, DC.  Information on the operation
of the Public Reference Room may be obtained by calling the SEC at
1-800-SEC-0330.  Reports and other information about the Fund are available on
the SEC's Internet site at http://www.sec.gov.  Copies of the information may be
obtained, upon payment of a duplicating fee by writing the Public Reference
Section of the SEC, Washington, DC  20549-6009.



NORTHWESTERN MUTUAL LIFE

Northwestern Mutual Variable CompLife-Registered Trademark-

Northwestern Mutual Variable Life Account

Northwestern Mutual Series Fund, Inc.
Russell Insurance Funds


90-1944 (4-99)


P R O S P E C T U S E S

Investment Company Act File Nos. 811-3990 and 811-5371


                                                                   -------------
NORTHWESTERN                                                         PRSRT STD
MUTUAL LIFE-Registered Trademark-                                   U S POSTAGE
                                                                        PAID
PO Box 3095                                                         MILWAUKEE WI
Milwaukee WI  53201-3095                                           PERMIT NO 426
                                                                   -------------


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