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

April 30, 1999

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

Northwestern Mutual Variable Executive Life

Flexible Premium Variable Life Insurance Policy


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.



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


EARNINGS
GROWTH
QUALITY
RELIABILITY
COMMITMENT
CAPITAL
INVESTMENT STRATEGY
QUALITY
INVESTED

PROSPECTUSES
<PAGE>
CONTENTS FOR THIS PROSPECTUS
<TABLE>
<CAPTION>
                                    Page
                                    ----
<S>                                 <C>
Prospectus........................    1
Summary...........................    2
  Variable Life Insurance.........    2
  The Account and its Divisions...    2
  The Policy......................    2
    Availability Limitations......    2
    Premiums......................    2
    Death Benefit.................    2
    Cash Value....................    2
    Deductions and Charges........    2
      From Premiums...............    2
      From Policy Value...........    2
      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.....    4
  Northwestern Mutual Life........    4
  The Account.....................    4
  The Funds.......................    4
   Northwestern Mutual Series
   Fund, Inc......................    4
    Small Cap Growth Stock
     Portfolio....................    4
    Aggressive Growth Stock
     Portfolio....................    5
    International Equity
     Portfolio....................    5
    Index 400 Stock Portfolio.....    5
    Growth Stock Portfolio........    5
    Growth and Income Stock
     Portfolio....................    5
    Index 500 Stock Portfolio.....    5
    Balanced Portfolio............    5
    High Yield Bond Portfolio.....    5
    Select Bond Portfolio.........    5
    Money Market Portfolio........    5
   Russell Insurance Funds........    5
    Multi-Style Equity Fund.......    6
    Aggressive Equity Fund........    6
    Non-U.S. Fund.................    6
    Real Estate Securities Fund...    6
    Core Bond Fund................    6
Detailed Information About the
 Policy...........................    6
  Premiums........................    6
  Death Benefit...................    7
    Death Benefit Options.........    7
    Choice of Tests for Tax
     Purposes.....................    7
    Death Benefit Changes.........    7
  Allocations to the Account......    8
 
<CAPTION>
                                    Page
                                    ----
<S>                                 <C>
  Deductions and Charges..........    8
    Deductions from Premiums......    8
    Charges Against the Policy
     Value........................    8
    Expenses of the Funds.........    9
Cash Value........................    9
Policy Loans......................    9
Withdrawals of Policy Value.......   10
Termination and Reinstatement.....   10
    Right to Return Policy........   10
    Other Policy Provisions.......   10
        Owner.....................   10
        Beneficiary...............   10
        Incontestability..........   11
        Suicide...................   11
        Misstatement of Age or
         Sex......................   11
        Collateral Assignment.....   11
        Deferral of Determination
         and Payment..............   11
        Dividends.................   11
    Voting Rights.................   11
    Substitution of Fund Shares
     and Other Changes............   12
Reports...........................   12
Distribution of the Policies......   12
Tax Considerations................   12
    General.......................   12
    Life Insurance
     Qualification................   12
    Tax Treatment of Life
     Insurance....................   13
    Modified Endowment
     Contracts....................   13
    Other Tax Considerations......   14
Other Information.................   15
    Management....................   15
    Regulation....................   17
    Year 2000 Issues..............   17
    Legal Proceedings.............   18
    Registration Statement........   18
    Experts.......................   18
Financial Statements..............   19
  Report of Independent
   Accountants (for the two years
   ended December 31, 1998).......   19
  Financial Statements of the
   Account (for the two years
   ended December 31, 1998).......   20
  Financial Statements of
   Northwestern Mutual Life (for
   the three years ended December
   31, 1998)......................   26
  Report of Independent
   Accountants (for the three
   years ended December 31,
   1998)..........................   39
Appendix..........................   40
</TABLE>
<PAGE>
PROSPECTUS
 
NORTHWESTERN MUTUAL VARIABLE EXECUTIVE LIFE
 
    - FLEXIBLE PREMIUM VARIABLE LIFE INSURANCE POLICY
 
This prospectus describes the Variable Executive Life Policy (the "Policy")
offered by The Northwestern Mutual Life Insurance Company. The Policy is an
individual flexible premium variable life insurance policy designed to be used
for a variety of business purposes.
 
The Policy offers flexible premium payments, sixteen investment funding options
and a choice of three death benefit options.
 
The investment options correspond to the eleven Portfolios of Northwestern
Mutual Series Fund, Inc. and the five Funds which comprise 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 values provided by the Policy vary daily depending on investment results.
These values are not guaranteed. The Portfolios and Funds present varying
degrees of investment risk.
 
You may return a Policy for a limited period of time. See "Right to Return
Policy", p. 10.
 
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 POLICY. IT OMITS DETAILS
WHICH ARE INCLUDED ELSEWHERE IN THIS PROSPECTUS AND 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. Both kinds of life insurance
provide an income tax-free death benefit and a cash value that grows
tax-deferred. 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 to reflect the
performance of the selected investments.
 
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. 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
 
AVAILABILITY LIMITATIONS  We have designed the Variable Executive Life Policy
for use with non-tax qualified executive benefit plans. We offer the Policy for
use with corporate-sponsored plans where at least five Policies will be issued,
each on the life of a different eligible insured person, and the first year
premium for the group will be at least $250,000. We will permit exceptions in
some cases and additional requirements may apply. Each case must be approved at
our Home Office.
 
PREMIUMS  You may pay premiums at any time and in any amounts, within limits,
but additional premiums will be required to keep the Policy in force if values
become insufficient to pay current charges.
 
DEATH BENEFIT  The Policy offers a choice of three death benefit options:
 
    - SPECIFIED AMOUNT (OPTION A)
 
    - SPECIFIED AMOUNT PLUS POLICY VALUE (OPTION B)
 
    - SPECIFIED AMOUNT PLUS PREMIUMS PAID (OPTION C)
 
In each case, the death benefit will be at least the amount needed to meet
federal income tax requirements for life insurance. You select the Specified
Amount when you purchase the Policy. You may increase or decrease the Specified
Amount, within limits and subject to conditions, after a Policy is issued. The
minimum amount is $50,000.00. No minimum death benefit is guaranteed.
 
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.
The Policy also includes loan and withdrawal provisions.
 
DEDUCTIONS AND CHARGES
 
FROM PREMIUMS
 
    - Deduction of 3.6% for local, state and federal taxes attributable to
      premiums
 
    - Sales load of 15% up to the Target Premium for first Policy year, and 3%
      of all other premiums. The Target Premium is based on the modified
      endowment contract seven-pay limit for the Specified Amount and the age
      and sex of the insured. See "Modified Endowment Contracts", p. 13. A
      Policy receiving the 3% deduction in the first Policy year on any portion
      of the premium will be classified as a modified endowment contract.
 
FROM POLICY VALUE
 
    - Cost of insurance charge deducted monthly, is based on the net amount at
      risk, the age, sex and risk classification of the insured, and the Policy
      duration. Current charges are based on our experience. Maximum charges are
      based on the 1980 CSO Mortality Tables.
 
    - Monthly mortality and expense risk charge. The current charge is at the
      annual rate of .75%
 
                                       --
                                       2
<PAGE>
      (0.06250% monthly rate) of the amount invested in the Account for the
      Policy for the first 10 Policy years, and .30% (0.02500% monthly rate)
      thereafter. The maximum annual rate is .90% (0.07500% monthly rate).
 
    - Monthly administrative charge. The current charge is $15.00 in the first
      Policy year and $5.00 thereafter. The maximum charge is $15 in the first
      Policy year and $10 thereafter.
 
    - Charge for expenses and taxes associated with the Policy loan, if any. The
      aggregate charge is at the current annual rate of .75% (0.06250% monthly
      rate) of the Policy debt for the first ten Policy years and .20%
      (0.01667%) thereafter.
 
    - Any transaction charges that may result from a withdrawal, a transfer, a
      change in the Specified Amount or a change in the death benefit option. We
      are currently waiving these charges. The maximum charge is $250 for death
      benefit option changes and $25 for each of the other transactions.
 
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 the average net assets, based on 1998 operations.
Expenses for the Portfolios and Funds which were not in operation during 1998
are estimated.
 
<TABLE>
<CAPTION>
                  NORTHWESTERN MUTUAL SERIES FUND, INC.
- --------------------------------------------------------------------------
                            INVESTMENT
PORTFOLIO                  ADVISORY FEE    OTHER EXPENSES   TOTAL 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.
 
<TABLE>
<CAPTION>
                         RUSSELL INSURANCE FUNDS
- --------------------------------------------------------------------------
                            INVESTMENT        OTHER EX-       TOTAL EX-
FUND                       ADVISORY FEE*       PENSES*          PENSES
- ------------------------  ---------------  ---------------  --------------
 
<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% 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.
 
                                       --
                                       3
<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, including 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
 
                                       --
                                       4
<PAGE>
common stocks of companies which can reasonably be 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
 
                                       --
                                       5
<PAGE>
Russell, Frank Russell Investment Management Company ("FRIMCo"). FRIMCo also
advises, operates and 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
 
PREMIUMS
 
The Policy permits you to pay premiums at any time before the Policy anniversary
that is nearest the insured's 95th birthday and in any amounts within the limits
described in this section.
 
We use the Specified Amount you select when you purchase the Policy to determine
the minimum initial premium. The minimum initial premium is approximately equal
to three times the initial monthly Cost of Insurance Charge and other
deductions.
 
We calculate a Target Premium when the Policy is issued and we use the Target
Premium to determine the sales load for the first Policy year. The Target
Premium is based on the Specified Amount and the age and sex of the insured.
 
                                       --
                                       6
<PAGE>
After a Policy is issued, there are no minimum premiums, except that we will not
accept a premium of less than $25. The Policy will remain in force during the
insured's lifetime so long as the Policy Value, less the amount of any Policy
debt, is sufficient to pay the monthly cost of insurance charge and other
current charges.
 
The Policy sets no maximum on premiums, but we will accept a premium that would
increase the net amount at risk only if the insurance, as increased, will be
within our issue limits, the insured meets our insurability requirements and we
receive the premium prior to the anniversary nearest the insured's 75th
birthday. We will not accept a premium if it would disqualify the Policy as life
insurance for federal income tax purposes. We will accept a premium, however,
even if it would cause the Policy to be classified as a modified endowment
contract. See "Tax Considerations", p. 12.
 
DEATH BENEFIT
 
DEATH BENEFIT OPTIONS  The Policy provides for three death benefit options:
 
SPECIFIED AMOUNT (OPTION A) You select the Specified Amount when you purchase
the Policy.
 
SPECIFIED AMOUNT PLUS POLICY VALUE (OPTION B) The Policy Value is the cumulative
amount invested, adjusted for investment results, reduced by the charges for
insurance and other expenses.
 
SPECIFIED AMOUNT PLUS PREMIUMS PAID (OPTION C)
 
In addition, under any of the Options, we will increase the Death Benefit if
necessary to meet the definitional requirements for life insurance for federal
income tax purposes as discussed below.
 
Under any of the death benefit options the death benefit will be equal to the
Policy Value at all times on and after the Policy anniversary nearest the 100th
birthday of the insured.
 
CHOICE OF TESTS FOR TAX PURPOSES  A Policy must satisfy one of two testing
methods to qualify as life insurance for federal income tax purposes. You may
choose either the Guideline Premium/Cash Value Corridor Test or the Cash Value
Accumulation Test. Both tests require the Policy to meet minimum ratios, or
multiples, of death benefit to the Policy Value. The minimum multiple decreases
as the age of the insured advances. You make the choice of testing methods when
you purchase a Policy and it may not be changed.
 
For the Guideline Premium/Cash Value Corridor Test the minimum multiples of
death benefit to the Policy Value are shown below.
 
                          GUIDELINE PREMIUM/CASH VALUE
                            CORRIDOR TEST MULTIPLES
 
<TABLE>
<CAPTION>
   ATTAINED        POLICY         ATTAINED        POLICY
     AGE           VALUE %          AGE           VALUE %
- --------------  -------------  --------------  -------------
<S>             <C>            <C>             <C>
40 or under...          250    61............          128
41............          243    62............          126
42............          236    63............          124
43............          229    64............          122
44............          222    65............          120
45............          215    66............          119
46............          209    67............          118
47............          203    68............          117
48............          197    69............          116
49............          191    70............          115
50............          185    71............          113
51............          178    72............          111
52............          171    73............          109
53............          164    74............          107
54............          157    75-90.........          105
55............          150    91............          104
56............          146    92............          103
57............          142    93............          102
58............          138    94............          101
59............          134    95 or over....          100
60............          130
</TABLE>
 
For the Cash Value Accumulation Test the minimum multiples of death benefit to
the Policy Value are calculated using net single premiums based on the attained
age of the insured and the Policy's underwriting classification, using a 4%
interest rate.
 
The Guideline Premium/Cash Value Corridor Test has lower minimum multiples than
the Cash Value Accumulation Test, usually resulting in better cash value
accumulation for a given amount of premium. But the Guideline Premium/Cash Value
Corridor Test limits the amount of premium that may be paid in each Policy year.
The Cash Value Accumulation Test has no such annual limitation, and allows more
premium to be paid during the early Policy years.
 
DEATH BENEFIT CHANGES  After we issue a Policy you may change the death benefit
option, or increase or decrease the Specified Amount, subject to our approval.
Changes are subject to insurability requirements and issue limits. We will not
permit a change if
 
                                       --
                                       7
<PAGE>
it results in a Specified Amount less than the minimum for a new Policy that we
would issue on that date.
 
A change in the death benefit option, or an increase or decrease in the
Specified Amount, will be effective on the monthly processing date next
following receipt of a written request at our Home Office.
 
Administrative charges of up to $250 for a change in the death benefit option,
and up to $25 for each of more than one change in the Specified Amount in a
Policy year, may apply. We will deduct any such charges from the Policy Value.
We are currently waiving these charges.
 
A change in the death benefit option, or an increase or decrease in the
Specified Amount, may have important tax effects. See "Tax Considerations", p.
12. The cost of insurance charge will increase if a change results in a larger
net amount at risk. See "Charges Against the Policy Value," below.
 
ALLOCATIONS TO THE ACCOUNT
 
We place the initial net premium in the Account on the Policy date. Net premiums
you pay thereafter are placed in the Account on the date we receive them at our
Home Office. Net premiums are premiums less the deductions from premiums. See
"Deductions from Premiums", below.
 
We invest premiums we place in the Account prior to the initial allocation date
in the Money Market Division of the Account. The initial allocation date will be
one day after the end of the period during which the policyowner has the right
to return the Policy, based on the applicable state laws. See "Right to Return
Policy," p. 10. 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 we place
in the Account thereafter. Allocation must be in whole percentages.
 
You may transfer accumulated amounts from one division of the Account to
another. 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, if there are more than twelve transfers in a
Policy year. We are currently waiving these charges.
 
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 3.6% of the premium. Of
this amount 2.35% 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 2.35%
rate is an average. The tax rate for a particular state may be lower, higher, or
equal to the 2.35% 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 our federal income taxes attributable to the treatment of deferred
acquisition costs.
 
We deduct a charge for sales costs from each premium. The charge is 15% of
premiums paid during each of the first ten Policy years up to the Target Premium
and 3% of all other premiums. The Target Premium is based on the Specified
Amount and the age and sex of the insured. 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 monthly
charge against the Policy Value for the mortality and expense risks we have
assumed, as described below.
 
CHARGES AGAINST THE POLICY VALUE  We deduct a cost of insurance charge from the
Policy Value on each monthly processing date. We determine the amount by
multiplying the net amount at risk by the cost of insurance rate. The net amount
at risk is equal to the death benefit currently in effect less the Policy Value.
The cost of insurance rate reflects the issue age, policy duration and risk
classification of the insured. The maximum cost of insurance rates are included
in the Policy.
 
We also deduct a charge for the mortality and expense risks we have assumed. The
maximum amount of the charge is equal to an annual rate of .90% (0.07500%
monthly rate) of the Policy Value. Currently the charge is equal to an annual
rate of .75% (0.06250% monthly rate) of Policy Value for the first ten Policy
years and .30% (0.0250% monthly rate) thereafter. 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
 
                                       --
                                       8
<PAGE>
to the extent it is not needed to provide benefits and pay expenses under the
Policies.
 
There is a monthly administrative charge of not more than $15 for the first
Policy year and $10 thereafter. Currently this charge will be $5 after the first
Policy year. This charge is for administrative expenses, including costs of
premium collection, processing claims, keeping records and communicating with
Policyowners. We do not expect to profit from this charge.
 
We make a charge for the expenses and taxes associated with the Policy debt, if
any. The aggregate charge is at the current annual rate of 0.75% (0.06250%
monthly rate) of the Policy debt for the first ten Policy years and 0.20%
(0.01667% monthly rate) thereafter.
 
The Policy provides for transaction fees to be deducted from the Policy Value on
the dates on which transactions take place. These charges are $25 for changes in
the Specified Amount, withdrawals or transfers of assets among the divisions of
the Account if more than twelve transfers take place in a Policy year. The fee
for a change in the death benefit option is $250. Currently we are waiving all
of these fees.
 
We will apportion deductions from the Policy Value among the divisions of the
Account in proportion to the amounts invested in the divisions.
 
EXPENSES OF THE FUNDS  The investment performance of each division of the
Account reflects all expenses borne by the corresponding Portfolio or Fund. The
expenses are summarized above on page 4. See the attached mutual fund
prospectuses for more information about those expenses.
 
CASH VALUE
 
You may surrender a Policy for the cash value at any time during the lifetime of
the insured. 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 reduced by any Policy debt outstanding. During the first
Policy year the cash value is increased by the amount of sales load previously
deducted from premiums, and during the second Policy year the cash value is
increased by 50% of previous sales load deductions. This increase in cash value
during the first two Policy years does not apply if the Policy is in a grace
period on the date on which you surrender the Policy.
 
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.
 
POLICY LOANS
 
You may borrow up to 90% of the Policy Value using the Policy as security. If a
Policy loan is already outstanding, the maximum amount for any new loan is 90%
of the Policy Value, less the amount already borrowed.
 
Interest on a Policy loan accrues and is payable on a daily basis at an annual
effective rate of 5%. We add unpaid interest to the amount of the loan. If the
amount of the loan equals or exceeds the Policy Value on a monthly processing
date, the Policy will enter the grace period. See "Termination and
Reinstatement", p. 10. We will send you a notice at least 61 days before the
termination date. The notice will show how much you must pay to keep the Policy
in force.
 
We will take the amount of a Policy loan 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 them on a daily basis with an
annual earnings rate equal to the 5% Policy loan interest rate. A Policy loan,
even if you repay it, will have a permanent effect on the Policy 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.
 
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
will transfer those amounts from our general account to the Account divisions,
in proportion to the premium allocation in effect, as of the same date.
 
                                       --
                                       9
<PAGE>
A Policy loan may have important tax consequences. See "Tax Considerations", p.
12.
 
WITHDRAWALS OF POLICY VALUE
 
You may make a withdrawal of Policy Value. A withdrawal may not reduce the loan
value to less than any Policy debt outstanding. The loan value is 90% of the
Policy Value, less any Policy debt already outstanding. Following a withdrawal
the remaining Policy Value, less any Policy debt outstanding, must be at least
three times the current monthly charges for the cost of insurance and other
expenses. The minimum amount for withdrawals is $250. We permit up to four
withdrawals in a Policy year. An administrative charge of up to $25 may apply,
but we are currently waiving this 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 will be larger than the amount of the withdrawal. If
Option A or Option C is in effect a withdrawal of Policy Value will reduce the
Specified Amount by the amount of the withdrawal. Following a withdrawal the
remaining death benefit must be at least the minimum amount that we would
currently issue.
 
We will take the amount withdrawn from Policy Value from the Account divisions
in proportion to the amounts in the divisions. The Policy makes no provision for
repayment of amounts withdrawn. A withdrawal of Policy Value may have important
tax consequences. See "Tax Considerations", p. 12.
 
TERMINATION AND REINSTATEMENT
 
If the Policy Value, less any Policy debt outstanding, is less than the monthly
charges for the cost of insurance and other expenses on any monthly processing
date, we allow a grace period of 61 days for the payment of sufficient premium
to keep the Policy in force. The grace period begins on the date that we send
you a notice. The notice will state the minimum amount of premium required to
keep the Policy in force and the date by which you must pay the premium. The
Policy will terminate unless you pay the required amount before the grace period
expires.
 
After a Policy has terminated, it may be reinstated within one year. The insured
must provide satisfactory evidence of insurability. The minimum amount of
premium required for reinstatement will be the monthly charges that were due
when the Policy terminated plus the charges for three more months.
 
Reinstatement of a Policy will be effective on the first monthly processing date
after an application for reinstatement is received at our Home Office, subject
to our approval. Any Policy debt that was outstanding when the Policy terminated
will also be reinstated.
 
The Policy Value when a Policy is reinstated is equal to the premium paid, after
the deduction for taxes and sales load, less the sum of all monthly charges for
the cost of insurance and other expenses for the grace period and for the
current month. We will allocate the Policy Value among the Account divisions
based on the allocation for premiums currently in effect.
 
A Policy may not be reinstated after the Policy has been surrendered for its
cash value.
 
See "Tax Considerations", p. 12, for a discussion of the tax effects associated
with termination and reinstatement of a Policy.
 
RIGHT TO RETURN POLICY
 
You may return a Policy within 45 days after you signed the application for
insurance or within 10 days (or later where required by state law) after you
receive the Policy, whichever is later. You may mail or deliver the Policy to
the agent who sold it or to our Home Office. If you return it, we will consider
the Policy void from the beginning. We will refund the sum of the amounts
deducted from the premium paid plus the value of the Policy in the Account on
the date we receive the returned Policy. In some states, the amount we refund
will not be less than the premium you paid.
 
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. We must receive written proof of the transfer at our Home Office. "You"
in this prospectus 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 we issue the Policy
you may
 
                                       --
                                       10
<PAGE>
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. We will
not contest an increase in the amount of insurance that was subject to
insurability requirements after the increased amount has been in force during
the lifetime of the insured for two years from the date of issuance of the
increase.
 
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. If the insured dies by suicide
within one year of the date of issuance of an increase in the amount of
insurance, which was subject to insurability requirements, the amount payable
with respect to the increase will be limited to the amounts charged for the cost
of insurance and other expenses attributable to the increase.
 
MISSTATEMENT OF AGE OR SEX.  If the age or sex of the insured has been
misstated, we will adjust the charges for cost of insurance and other expenses
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.
 
DEFERRAL OF DETERMINATION AND PAYMENT.  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.
 
DIVIDENDS.  The Policies will share in divisible surplus to the extent we
determine annually. Since we do not expect the Policies to contribute to
divisible surplus, we do not expect to pay any dividends.
 
VOTING RIGHTS
 
We are the owner of the shares of both mutual funds 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 mutual 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 mutual fund shareholders' meeting. 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 of the mutual funds held in our
general account in the same proportions as the shares for which we have received
voting instructions. 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 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.
 
                                       --
                                       11
<PAGE>
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,
shares of another Portfolio or Fund or another mutual fund may be substituted.
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
 
At least once each Policy year you will receive a statement showing the death
benefit, cash value, Policy Value and any Policy loan, including loan interest.
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.
 
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 as a Wisconsin corporation. 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 15% of the premium for the first
year and 2 3/4% of the premium thereafter. During the sixth Policy year and
thereafter agents will receive compensation at the annual rate of .20% of the
cash value of a Policy.
 
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 CONSIDERATIONS
 
GENERAL  The following discussion provides a general description of federal
income tax considerations relating to the Policy. The discussion is based on
current provisions of the Internal Revenue Code ("Code") as currently
interpreted by the Internal Revenue Service. We do not intend this as tax
advice. The discussion is not exhaustive, it does not address the likelihood of
future changes in federal income tax law or interpretations thereof, and it does
not address state or local tax considerations which may be significant in the
purchase and ownership of a Policy.
 
LIFE INSURANCE QUALIFICATION  Section 7702 of the Code defines life insurance
for federal income tax purposes. The Code provides two alternative tests for
determining whether the death benefit is a sufficient multiple of the Policy
Value. See "Choice of Tests for Tax Purposes", p. 7. We have designed the Policy
to comply with these rules. We will return premiums that would cause a Policy to
be disqualified as life insurance.
 
Section 817(h) of the Code authorizes the Secretary of the Treasury to set
standards for diversification of the investments underlying variable life
insurance policies. Final regulations have been issued pursuant to this
authority. Failure to meet the diversification requirements would disqualify the
Policies as life insurance for purposes of Section 7702 of the Code. We intend
to comply with these requirements.
 
The Treasury Department, in connection with the diversification requirements,
stated that it expected to issue guidance about circumstances where a
policyowner's control of separate account assets would cause the policyowner,
and not the life insurance company, to be treated as the owner of those assets.
These guidelines have not been issued. If the owner of a Policy were treated as
the owner of the Fund shares held in the Account, the income and gains related
to those shares would be included in the owner's gross income for federal income
tax purposes. We believe that we own the assets of the Account under current
federal income tax law.
 
                                       --
                                       12
<PAGE>
TAX TREATMENT OF LIFE INSURANCE  While a Policy is in force, increases in the
Policy Value as a result of investment experience are not subject to federal
income tax until there is a distribution as defined by the Code. The death
benefit received by a beneficiary will not be subject to federal income tax.
 
Unless the Policy is a modified endowment contract, as described below, we
believe that a loan received under a Policy will be construed as indebtedness of
the owner and no part of the loan will be treated as a distribution subject to
current federal income tax. Interest paid by individual owners of the Policies
will ordinarily not be deductible. You should consult a qualified tax adviser as
to the deductibility of interest paid, or accrued, by other purchasers of the
Policies. See "Other Tax Considerations", p. 14.
 
As a general rule, the proceeds from a withdrawal of Policy Value will be
taxable only to the extent that the withdrawal exceeds the basis of the Policy.
The basis of the Policy is generally equal to the premiums paid less any amounts
previously received as tax-free distributions. In certain circumstances, a
withdrawal of Policy Value during the first 15 Policy years may be taxable to
the extent that the Policy Value exceeds the basis of the Policy. This means
that the amount withdrawn may be taxable even if that amount is less than the
basis of the Policy. In addition, if a Policy terminates while a Policy loan is
outstanding, the cancellation of the loan and accrued interest will be treated
as a distribution from the Policy and may be taxable under these rules.
 
Special tax rules may apply when ownership of a Policy is transferred. You
should seek qualified tax advice if you plan a transfer of ownership.
 
MODIFIED ENDOWMENT CONTRACTS  A Policy will be classified as a modified
endowment contract if the cumulative premium paid during the first seven Policy
years exceeds a defined "seven-pay" limit. The seven-pay limit is based on a
hypothetical life insurance policy issued on the same insured person and for the
same initial death benefit which, under specified conditions (which include the
absence of expense and administrative charges) will be fully paid for after
seven level annual payments. A Policy will be treated as a modified endowment
contract unless cumulative premiums paid under the Policy, at all times during
the first seven Policy years, are less than or equal to the cumulative seven-pay
premiums which would have been paid under the hypothetical policy on or before
such times.
 
Whenever there is a "material change" under a Policy, it will generally be
treated as a new contract for purposes of determining whether the Policy is a
modified endowment contract, and subjected to a new seven-pay period and a new
seven-pay limit. The new seven-pay limit would be determined taking into account
the Policy Value of the Policy at the time of such change. A materially changed
Policy would be considered a modified endowment contract if it failed to satisfy
the new seven-pay limit. A material change could occur as a result of a change
in the death benefit option, a change in the Specified Amount, and certain other
changes.
 
If the benefits are reduced during the first seven Policy years after entering
into the Policy (or within seven years after a material change), for example, by
requesting a decrease in the Specified Amount or, in some cases, by making a
withdrawal of Policy Value, the seven-pay premium limit will be redetermined
based on the reduced level of benefits and applied retroactively for purposes of
the seven-pay test. If the premiums previously paid are greater than the
calculated seven-pay premium level limit, the Policy will become a modified
endowment contract. A life insurance policy which is received in exchange for a
modified endowment contract will also be considered a modified endowment
contract.
 
If a Policy is a modified endowment contract, any distribution from the Policy
will be taxed on a gain-first basis. Distributions for this purpose include a
loan (including any increase in the loan amount to pay interest on an existing
loan or an assignment or a pledge to secure a loan) or a withdrawal of Policy
Value. Any such distributions will be considered taxable income to the extent
the Policy Value exceeds the basis in the Policy. For modified endowment
contracts, the basis would be increased by the amount of any prior loan under
the Policy that was considered taxable income. For purposes of determining the
taxable portion of any distribution, all modified endowment contracts issued by
Northwestern Mutual Life to the same policyowner (excluding certain qualified
plans) during any calendar year are to be aggregated. The Secretary of the
Treasury has authority to prescribe additional rules to prevent avoidance of
gain-first taxation on distributions from modified endowment contracts.
 
                                       --
                                       13
<PAGE>
A 10% penalty tax will apply to the taxable portion of a distribution from a
modified endowment contract. The penalty tax will not, however, apply to
distributions (i) to taxpayers 59 1/2 years of age or older, (ii) in the case of
a disability (as defined in the Code) or (iii) received as part of a series of
substantially equal periodic annuity payments for the life (or life expectancy)
of the taxpayers or the joint lives (or joint life expectancies) of the taxpayer
and his beneficiaries. If a Policy is surrendered, the excess, if any, of the
Policy Value over the basis of the Policy will be subject to federal income tax
and, unless one of the above exceptions applies, the 10% penalty tax. The
exceptions generally do not apply to life insurance policies owned by
corporations or other entities. If a Policy terminates while there is a Policy
loan, the cancellation of the loan and accrued loan interest will be treated as
a distribution to the extent not previously treated as such and could be subject
to tax, including the penalty tax, as described under the above rules.
 
If a Policy becomes a modified endowment contract, distributions that occur
during the Policy year it becomes a modified endowment contract and any
subsequent Policy year will be taxed as described in the two preceding
paragraphs. In addition, distributions from a Policy within two years before it
becomes a modified endowment contract will be subject to tax in this manner.
This means that a distribution made from a Policy that is not a modified
endowment contract could later become taxable as a distribution from a modified
endowment contract. The Secretary of the Treasury has been authorized to
prescribe rules which would treat similarly other distributions made in
anticipation of a policy becoming a modified endowment contract.
 
OTHER TAX CONSIDERATIONS  Business-owned life insurance may be subject to
certain additional rules. Section 264(a)(1) of the Code generally disallows a
deduction for premiums paid on Policies by anyone who is directly or indirectly
a beneficiary under the Policy. Increases in Policy Value may also be subject to
tax under the corporation alternative minimum tax provisions.
 
Section 264(a)(4) of the Code limits the Policyowner's deduction for interest on
loans taken against life insurance policies to interest on an aggregate total of
$50,000 of loans per covered life only with respect to life insurance policies
covering key persons. Generally, a key person means an officer or a 20% owner.
However, the number of key persons will be limited to the greater of (a) five
individuals, or (b) the lesser of 5% of the total officers and employees of the
taxpayer or 20 individuals. Deductible interest for these Policies will be
subject to limits based on current market rates.
 
In addition, Section 264(f) disallows a proportionate amount of a business'
interest deduction based on the amount of unborrowed cash value of non-exempt
life insurance policies held in relation to other business assets. Exempt
policies include policies held by natural persons unless the business is a
direct or indirect beneficiary under the policy and policies owned by a business
and insuring employees, directors, officers and 20% owners (as well as joint
policies insuring 20% owners and their spouses).
 
Finally, life insurance subject to a split dollar arrangement is taxable to the
employee in the amount of the annual value of the economic benefit to the
employee measured by the issuer's lowest one-year term rates as defined by
various Internal Revenue Service rulings or the government's P.S. 58 table
rates. There is also a risk that the accrued earnings in equity split dollar
policies may be taxable in the year earned. Although the Internal Revenue
Service has not issued a formal ruling on this issue, it issued a technical
advise memorandum in 1996 to this effect (which is applicable only to the
taxpayer under audit) and is currently reviewing the taxation of split dollar
arrangements generally.
 
Depending on the circumstances, the exchange of a Policy, a change in the death
benefit option, a Policy loan, a withdrawal of Policy Value, a change in
ownership or an assignment of the Policy may have federal income tax
consequences. In addition, federal, state and local transfer, estate,
inheritance, and other tax consequences of Policy ownership, premium payments
and receipt of Policy proceeds depend on the circumstances of each Policyowner
or beneficiary. If you contemplate any such transaction you should consult a
qualified tax adviser.
 
                                       --
                                       14
<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, as of the date of this
prospectus, are listed below. Unless otherwise indicated, the business address
of each Trustee and senior officer is c/o The Northwestern Mutual Life Insurance
Company, 720 East Wisconsin Avenue, Milwaukee, Wisconsin 53202.
 
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, 111 West Second Street, P.O. Box 310, Jamestown, NY
                                               14702-0310 (diversified metal products manufacturing)
 
Edward E. Barr (HR)..........................  Chairman, Sun Chemical Corporation, 222 Bridge Plaza South, Fort Lee, New
                                               Jersey 07024 (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, 1025
                                               West Eighth Street, Kansas City, MO 64101 (consumer products manufacturer)
 
Robert C. Buchanan (A, E, F).................  President and Chief Executive Officer, Fox Valley Corporation, 100 West
                                               Lawrence Street, P.O. Box 727, Appleton, WI 54911 (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, 425 Meadow Street, P.O. Box 901,
                                               Chicopee, MA 01021-0901 (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, P.O. Box 551, 1 Rodney Square,
                                               Wilmington, DE 19899
 
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, 460 St. Michaels Drive,
                                               Building 300, Santa Fe, NM 87505
 
Stephen N. Graff (E, F, OT)..................  Retired Partner, Arthur Andersen LLP (public accountants). Address: 805 Lone
                                               Tree Road, Elm Grove, WI 53122-2014
 
Patricia Albjerg Graham (HR).................  Professor, Graduate School of Education, Harvard University, 420 Gutman,
                                               Cambridge, MA 02138. President, The Spencer Foundation (social and behavioral
                                               sciences)
 
Stephen F. Keller (HR).......................  Attorney. Former Chairman, Santa Anita Realty Enterprises since 1997; prior
                                               thereto, Chairman. Address: 101 South Las Palmas Avenue, Los Angeles, CA 90004
 
Barbara A. King (AM).........................  President, Landscape Structures, Inc., Rt 3, 601 - 7th Street South, Delano,
                                               MN 55328 (manufacturer of playground equipment)
 
J. Thomas Lewis (HR).........................  Attorney (retired), 228 St. Charles Avenue, Suite 1024, New Orleans, LA 70130,
                                               since 1998; prior thereto, Attorney, Monroe & Lemann, New Orleans, LA
</TABLE>
 
                                       --
                                       15
<PAGE>
<TABLE>
<CAPTION>
NAME                                           PRINCIPAL OCCUPATION DURING LAST FIVE YEARS
- ---------------------------------------------  ------------------------------------------------------------------------------
<S>                                            <C>
Daniel F. McKeithan, Jr. (E, F, HR)..........  President, Tamarack Petroleum Company, Inc., 777 East Wisconsin Avenue,
                                               Milwaukee, WI 53202 (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, 433 East Michigan Street,
                                               Milwaukee, WI 53202 since 1997; prior thereto, Chairman and Chief Executive
                                               Officer
 
Timothy D. Proctor (A).......................  Director, Worldwide Human Resources of Glaxo Wellcome plc, Glaxo Wellcome
                                               House, Berkeley Avenue, Greenford, Middlesex UB60NN, United Kingdom, since
                                               1998; prior thereto, Senior Vice President Human Resources, General Counsel &
                                               Secretary (pharmaceuticals)
 
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, Fairview Avenue
                                               North and John Street, P.O. Box 70, Seattle, WA 98109 (publishing)
 
Harold B. Smith (OT).........................  Chairman, Executive Committee, Illinois Tool Works, Inc., 3600 West Lake
                                               Avenue, Glenview, IL 60025-5811 (engineered components and industrial systems
                                               and consumables)
 
Sherwood H. Smith, Jr. (AM)..................  Chairman of the Board of Carolina Power & Light, 411 Fayetteville Street Mall,
                                               P.O. Box 1551, Raleigh, NC 27602, since 1997; prior thereto, Chairman of the
                                               Board and Chief Executive Officer.
 
John E. Steuri (OT)..........................  Chairman, Advanced Thermal Technologies, 2102 Riverfront Drive, Suite 120,
                                               Little Rock, AR 72202-1747 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, 201 East Seven Hills
                                               Road, P.O. Box 998, Port Washington, WI 53074-0998
 
Barry L. Williams (HR).......................  President and Chief Executive Officer of Williams Pacific Ventures, Inc., 100
                                               First Street, Suite 2350, San Francisco, CA 94105-2634 (venture capital)
 
Kathryn D. Wriston (A).......................  Director of various corporations. Address: c/o Shearman & Sterling, 599
                                               Lexington Avenue, Room 1126, New York, NY 10022
 
A -- Member, Audit Committee                   F -- Member, Finance Committee
AM -- Member, Agency and Marketing Committee   HR -- Member, Human Resources and Public Policy Committee
                                               OT -- Member, Operations and Technology Committee
E  -- Member, Executive Committee
</TABLE>
 
                                       --
                                       16
<PAGE>
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 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 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 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
 
                                       --
                                       17
<PAGE>
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 its 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.
 
                                       --
                                       18
<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.
 
                   [SIG]
 
Milwaukee, Wisconsin
January 25, 1999
 
                                       --
                                       19
<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
 
                                       --
                                       20
<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
 
                                      ---
                                       21
<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
 
                                      ---
                                       22
<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
 
                                      ---
                                       23
<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.
 
                                       --
                                       24
<PAGE>
NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
 
NOTES TO FINANCIAL STATEMENTS
 
DECEMBER 31, 1998
 
(IN THOUSANDS)
 
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>
 
                                       --
                                       25
<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.
 
                                       --
                                       26
<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.
 
                                       --
                                       27
<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.
 
                                       --
                                       28
<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.
 
                                       --
                                       29
<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>
 
                                       --
                                       30
<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.
 
                                       --
                                       31
<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.
 
                                       --
                                       32
<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.
 
                                       --
                                       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
 
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
 
                                       --
                                       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
 
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,   DECEMBER 31,
                                                   1998           1997
                                               ------------   ------------
<S>                                            <C>            <C>            <C>
Foreign Currency Forward                                                     Currency exposure on foreign-denominated
 Contracts...................................      $601           $564       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
 
                                       --
                                       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
 
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
 
                                       --
                                       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
 
($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>
 
                                       --
                                       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
 
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.
 
                                       --
                                       38
<PAGE>
                            [LOGO]
 
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
 
                                       --
                                       39
<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 investment return rates of 0%, 6% and 12% on assets of the
Account. The Policies illustrated are on a sex-neutral basis, age 45, $500,000
Specified Amount and death benefit Option A with a $10,000 annual planned
premium. The first four illustrations, on pages 41-44, are for a Policy issued
to a guaranteed issue, non-Tobacco risk using 1) the guideline premium/cash
value corridor test, and 2) the cash value accumulation test for the definition
of life insurance, based on both current charges and on maximum charges. The
next four illustrations are for a Policy issued to a select risk using the two
different definition of life insurance tests and based on both current charges
and on maximum charges.
 
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 Portfolio 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 and deductions from Policy Value. The amounts shown as the cash
values reflect the fact that the Company will refund a portion of the sales load
for a policy surrendered during the first two 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. 4. Thus the 0%, 6% and 12% gross
hypothetical return rates on the Fund's assets are equivalent to the net rates
of -.66%, 5.34% and 11.34% 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 41, 43, 45 and
47 illustrate benefits which would be paid if investment returns of 0%, 6% and
12% are realized, if mortality and expense experience in the future is as
currently experienced. HOWEVER, CURRENT MONTHLY COST OF INSURANCE AND EXPENSE
CHARGES MAY CHANGE SUBJECT TO THE STATED MAXIMUM CHARGES.
 
A comparable illustration based on a proposed insured's age, sex and risk
classification and proposed face amount or premium is available upon request.
 
                                       --
                                       40
<PAGE>
                FLEXIBLE PREMIUM VARIABLE LIFE INSURANCE POLICY
            SEX-NEUTRAL ISSUE AGE 45 -- GUARANTEED ISSUE NON-TOBACCO
                           $500,000 SPECIFIED AMOUNT
                             DEATH BENEFIT OPTION A
                             $10,000 ANNUAL PREMIUM
                  GUIDELINE PREMIUM / CASH VALUE CORRIDOR TEST
 
                                CURRENT CHARGES
 
<TABLE>
<CAPTION>
                                                         DEATH BENEFIT                       CASH VALUE
                                                --------------------------------  --------------------------------
                                  PREMIUM         ASSUMING HYPOTHETICAL GROSS       ASSUMING HYPOTHETICAL GROSS
                               ACCUMULATED AT     ANNUAL INVESTMENT RETURN OF       ANNUAL INVESTMENT RETURN OF
           END OF               5% INTEREST     --------------------------------  --------------------------------
         POLICY YEAR              PER YEAR         0%         6%         12%         0%         6%         12%
- -----------------------------  --------------   --------  ----------  ----------  --------  ----------  ----------
<S>                            <C>              <C>       <C>         <C>         <C>       <C>         <C>
1............................        10,500      500,000     500,000     500,000     8,650       9,107       9,565
2............................        21,525      500,000     500,000     500,000    16,358      17,794      19,284
3............................        33,101      500,000     500,000     500,000    23,605      26,560      29,747
4............................        45,256      500,000     500,000     500,000    31,541      36,569      42,208
5............................        58,019      500,000     500,000     500,000    39,326      46,998      55,948
6............................        71,420      500,000     500,000     500,000    46,909      57,816      71,055
7............................        85,491      500,000     500,000     500,000    54,298      69,046      87,681
8............................       100,266      500,000     500,000     500,000    61,497      80,714     105,999
9............................       115,779      500,000     500,000     500,000    68,462      92,796     126,155
10...........................       132,068      500,000     500,000     500,000    75,249     105,371     148,407
15...........................       226,575      500,000     500,000     500,000   107,789     179,430     306,159
20 (age 65)..................       347,193      500,000     500,000     700,369   134,107     271,755     574,073
25...........................       501,135      500,000     500,000   1,184,378   151,814     389,773   1,021,016
30...........................       697,608      500,000     583,497   1,889,588   154,116     545,325   1,765,970
35...........................       948,363      500,000     781,441   3,164,856   126,629     744,229   3,014,149
40...........................     1,268,398      500,000   1,039,078   5,318,749    31,803     989,598   5,065,476
45...........................     1,676,852            0   1,347,562   8,789,959         0   1,283,392   8,371,389
</TABLE>
 
ASSUMES NO POLICY LOAN OR WITHDRAWAL 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
TO THE DIVISIONS OF THE VARIABLE ACCOUNT AND THE DIFFERENT RATES OF RETURN OF
THE VARIABLE ACCOUNT.
 
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. THEY WOULD ALSO BE DIFFERENT IF PREMIUMS WERE PAID IN DIFFERENT
AMOUNTS OR FREQUENCIES THAN SHOWN. 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.
 
                                       --
                                       41
<PAGE>
                FLEXIBLE PREMIUM VARIABLE LIFE INSURANCE POLICY
            SEX-NEUTRAL ISSUE AGE 45 -- GUARANTEED ISSUE NON-TOBACCO
                           $500,000 SPECIFIED AMOUNT
                             DEATH BENEFIT OPTION A
                             $10,000 ANNUAL PREMIUM
                  GUIDELINE PREMIUM / CASH VALUE CORRIDOR TEST
 
                               GUARANTEED CHARGES
 
<TABLE>
<CAPTION>
                                                             DEATH BENEFIT                    CASH VALUE
                                                     ------------------------------  -----------------------------
                                       PREMIUM        ASSUMING HYPOTHETICAL GROSS     ASSUMING HYPOTHETICAL GROSS
                                    ACCUMULATED AT    ANNUAL INVESTMENT RETURN OF     ANNUAL INVESTMENT RETURN OF
              END OF                 5% INTEREST     ------------------------------  -----------------------------
           POLICY YEAR                 PER YEAR         0%        6%        12%        0%        6%        12%
- ----------------------------------  --------------   --------  --------  ----------  -------  --------  ----------
<S>                                 <C>              <C>       <C>       <C>         <C>      <C>       <C>
1.................................        10,500      500,000   500,000     500,000    7,235     7,646       8,059
2.................................        21,525      500,000   500,000     500,000   13,379    14,632      15,938
3.................................        33,101      500,000   500,000     500,000   18,978    21,513      24,257
4.................................        45,256      500,000   500,000     500,000   25,241    29,504      34,304
5.................................        58,019      500,000   500,000     500,000   31,217    37,665      45,219
6.................................        71,420      500,000   500,000     500,000   36,916    46,012      57,110
7.................................        85,491      500,000   500,000     500,000   42,291    54,507      70,040
8.................................       100,266      500,000   500,000     500,000   47,352    63,170      84,142
9.................................       115,779      500,000   500,000     500,000   52,107    72,020      99,564
10................................       132,068      500,000   500,000     500,000   56,459    80,974     116,378
15................................       226,575      500,000   500,000     500,000   72,185   127,807     228,593
20 (age 65).......................       347,193      500,000   500,000     507,493   75,097   177,668     415,978
25................................       501,135      500,000   500,000     841,911   56,470   228,214     725,785
30................................       697,608            0   500,000   1,308,408        0   277,899   1,222,812
35................................       948,363            0   500,000   2,131,270        0   322,455   2,029,781
40................................     1,268,398            0   500,000   3,463,907        0   362,079   3,298,959
45................................     1,676,852            0   500,000   5,512,562        0   394,699   5,250,059
</TABLE>
 
ASSUMES NO POLICY LOAN OR WITHDRAWAL 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
TO THE DIVISIONS OF THE VARIABLE ACCOUNT AND THE DIFFERENT RATES OF RETURN OF
THE VARIABLE ACCOUNT.
 
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. THEY WOULD ALSO BE DIFFERENT IF PREMIUMS WERE PAID IN DIFFERENT
AMOUNTS OR FREQUENCIES THAN SHOWN. 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.
 
                                       --
                                       42
<PAGE>
                FLEXIBLE PREMIUM VARIABLE LIFE INSURANCE POLICY
            SEX-NEUTRAL ISSUE AGE 45 -- GUARANTEED ISSUE NON-TOBACCO
                           $500,000 SPECIFIED AMOUNT
                             DEATH BENEFIT OPTION A
                             $10,000 ANNUAL PREMIUM
                          CASH VALUE ACCUMULATION TEST
 
                                CURRENT CHARGES
 
<TABLE>
<CAPTION>
                                                         DEATH BENEFIT                       CASH VALUE
                                                --------------------------------  --------------------------------
                                                  ASSUMING HYPOTHETICAL GROSS       ASSUMING HYPOTHETICAL GROSS
                                  PREMIUM                    ANNUAL                            ANNUAL
                               ACCUMULATED AT         INVESTMENT RETURN OF              INVESTMENT RETURN OF
           END OF               5% INTEREST     --------------------------------  --------------------------------
         POLICY YEAR              PER YEAR         0%         6%         12%         0%         6%         12%
- -----------------------------  --------------   --------  ----------  ----------  --------  ----------  ----------
<S>                            <C>              <C>       <C>         <C>         <C>       <C>         <C>
1............................        10,500      500,000     500,000     500,000     8,650       9,107       9,565
2............................        21,525      500,000     500,000     500,000    16,358      17,794      19,284
3............................        33,101      500,000     500,000     500,000    23,605      26,560      29,747
4............................        45,256      500,000     500,000     500,000    31,541      36,569      42,208
5............................        58,019      500,000     500,000     500,000    39,326      46,998      55,948
6............................        71,420      500,000     500,000     500,000    46,909      57,816      71,055
7............................        85,491      500,000     500,000     500,000    54,298      69,046      87,681
8............................       100,266      500,000     500,000     500,000    61,497      80,714     105,999
9............................       115,779      500,000     500,000     500,000    68,462      92,796     126,155
10...........................       132,068      500,000     500,000     500,000    75,249     105,371     148,407
15...........................       226,575      500,000     500,000     610,291   107,789     179,430     305,585
20 (age 65)..................       347,193      500,000     500,000     989,179   134,107     271,755     561,933
25...........................       501,135      500,000     607,479   1,530,330   151,814     386,442     973,504
30...........................       697,608      500,000     741,887   2,307,023   154,116     521,732   1,622,414
35...........................       948,363      500,000     885,515   3,435,244   126,629     676,241   2,623,393
40...........................     1,268,398      500,000   1,035,317   5,052,457    31,803     846,424   4,130,637
45...........................     1,676,852            0   1,189,346   7,349,067         0   1,025,216   6,334,896
</TABLE>
 
ASSUMES NO POLICY LOAN OR WITHDRAWAL 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
TO THE DIVISIONS OF THE VARIABLE ACCOUNT AND THE DIFFERENT RATES OF RETURN OF
THE VARIABLE ACCOUNT.
 
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. THEY WOULD ALSO BE DIFFERENT IF PREMIUMS WERE PAID IN DIFFERENT
AMOUNTS OR FREQUENCIES THAN SHOWN. 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.
 
                                       --
                                       43
<PAGE>
                FLEXIBLE PREMIUM VARIABLE LIFE INSURANCE POLICY
            SEX-NEUTRAL ISSUE AGE 45 -- GUARANTEED ISSUE NON-TOBACCO
                           $500,000 SPECIFIED AMOUNT
                             DEATH BENEFIT OPTION A
                             $10,000 ANNUAL PREMIUM
                          CASH VALUE ACCUMULATION TEST
 
                               GUARANTEED CHARGES
 
<TABLE>
<CAPTION>
                                                            DEATH BENEFIT                     CASH VALUE
                                                    ------------------------------  ------------------------------
                                                     ASSUMING HYPOTHETICAL GROSS     ASSUMING HYPOTHETICAL GROSS
                                      PREMIUM                   ANNUAL                          ANNUAL
                                   ACCUMULATED AT        INVESTMENT RETURN OF            INVESTMENT RETURN OF
             END OF                 5% INTEREST     ------------------------------  ------------------------------
           POLICY YEAR                PER YEAR         0%        6%        12%         0%        6%        12%
- ---------------------------------  --------------   --------  --------  ----------  --------  --------  ----------
<S>                                <C>              <C>       <C>       <C>         <C>       <C>       <C>
1................................        10,500      500,000   500,000     500,000     7,235     7,646       8,059
2................................        21,525      500,000   500,000     500,000    13,379    14,632      15,938
3................................        33,101      500,000   500,000     500,000    18,978    21,513      24,257
4................................        45,256      500,000   500,000     500,000    25,241    29,504      34,304
5................................        58,019      500,000   500,000     500,000    31,217    37,665      45,219
6................................        71,420      500,000   500,000     500,000    36,916    46,012      57,110
7................................        85,491      500,000   500,000     500,000    42,291    54,507      70,040
8................................       100,266      500,000   500,000     500,000    47,352    63,170      84,142
9................................       115,779      500,000   500,000     500,000    52,107    72,020      99,564
10...............................       132,068      500,000   500,000     500,000    56,459    80,974     116,378
15...............................       226,575      500,000   500,000     500,000    72,185   127,807     228,593
20 (age 65)......................       347,193      500,000   500,000     715,520    75,097   177,668     406,472
25...............................       501,135      500,000   500,000   1,050,331    56,470   228,214     668,157
30...............................       697,608            0   500,000   1,487,001         0   277,899   1,045,734
35...............................       948,363            0   500,000   2,061,929         0   322,455   1,574,634
40...............................     1,268,398            0   500,000   2,823,235         0   362,079   2,308,136
45...............................     1,676,852            0   500,000   3,836,833         0   394,699   3,307,350
</TABLE>
 
ASSUMES NO POLICY LOAN OR WITHDRAWAL 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
TO THE DIVISIONS OF THE VARIABLE ACCOUNT AND THE DIFFERENT RATES OF RETURN OF
THE VARIABLE ACCOUNT.
 
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. THEY WOULD ALSO BE DIFFERENT IF PREMIUMS WERE PAID IN DIFFERENT
AMOUNTS OR FREQUENCIES THAN SHOWN. 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.
 
                                       --
                                       44
<PAGE>
                FLEXIBLE PREMIUM VARIABLE LIFE INSURANCE POLICY
              SEX-NEUTRAL ISSUE AGE 45 -- SELECT UNDERWRITING RISK
                           $500,000 SPECIFIED AMOUNT
                             DEATH BENEFIT OPTION A
                             $10,000 ANNUAL PREMIUM
                  GUIDELINE PREMIUM / CASH VALUE CORRIDOR TEST
 
                                CURRENT CHARGES
 
<TABLE>
<CAPTION>
                                                                  DEATH BENEFIT                            CASH VALUE
                                                      -------------------------------------   -------------------------------------
                                        PREMIUM        ASSUMING HYPOTHETICAL GROSS ANNUAL      ASSUMING HYPOTHETICAL GROSS ANNUAL
                                     ACCUMULATED AT           INVESTMENT RETURN OF                    INVESTMENT RETURN OF
              END OF                  5% INTEREST     -------------------------------------   -------------------------------------
            POLICY YEAR                 PER YEAR         0%           6%            12%          0%           6%            12%
- -----------------------------------  --------------   ---------   -----------   -----------   ---------   -----------   -----------
<S>                                  <C>              <C>         <C>           <C>           <C>         <C>           <C>
1..................................        10,500       500,000       500,000       500,000       9,001         9,470         9,938
2..................................        21,525       500,000       500,000       500,000      16,992        18,469        20,002
3..................................        33,101       500,000       500,000       500,000      24,514        27,557        30,839
4..................................        45,256       500,000       500,000       500,000      32,771        37,954        43,764
5..................................        58,019       500,000       500,000       500,000      40,813        48,727        57,953
6..................................        71,420       500,000       500,000       500,000      48,701        59,952        73,601
7..................................        85,491       500,000       500,000       500,000      56,332        71,549        90,764
8..................................       100,266       500,000       500,000       500,000      63,819        83,646       109,716
9..................................       115,779       500,000       500,000       500,000      71,165        96,269       130,655
10.................................       132,068       500,000       500,000       500,000      78,373       109,447       153,799
15.................................       226,575       500,000       500,000       500,000     113,567       187,550       317,999
20 (age 65)........................       347,193       500,000       500,000       725,983     141,840       284,262       595,068
25.................................       501,135       500,000       500,000     1,225,043     159,737       406,829     1,056,072
30.................................       697,608       500,000       607,203     1,952,123     162,524       567,479     1,824,414
35.................................       948,363       500,000       810,902     3,267,379     136,320       772,288     3,111,789
40.................................     1,268,398       500,000     1,076,141     5,488,885      44,695     1,024,896     5,227,509
45.................................     1,676,852             0     1,393,645     9,069,014           0     1,327,281     8,637,156
</TABLE>
 
ASSUMES NO POLICY LOAN OR WITHDRAWAL 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
TO THE DIVISIONS OF THE VARIABLE ACCOUNT AND THE DIFFERENT RATES OF RETURN OF
THE VARIABLE ACCOUNT.
 
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. THEY WOULD ALSO BE DIFFERENT IF PREMIUMS WERE PAID IN DIFFERENT
AMOUNTS OR FREQUENCIES THAN SHOWN. 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>
                FLEXIBLE PREMIUM VARIABLE LIFE INSURANCE POLICY
              SEX-NEUTRAL ISSUE AGE 45 -- SELECT UNDERWRITING RISK
                           $500,000 SPECIFIED AMOUNT
                             DEATH BENEFIT OPTION A
                             $10,000 ANNUAL PREMIUM
                  GUIDELINE PREMIUM / CASH VALUE CORRIDOR TEST
                               GUARANTEED CHARGES
 
<TABLE>
<CAPTION>
                                                             DEATH BENEFIT                    CASH VALUE
                                                     ------------------------------  -----------------------------
                                       PREMIUM        ASSUMING HYPOTHETICAL GROSS     ASSUMING HYPOTHETICAL GROSS
                                    ACCUMULATED AT    ANNUAL INVESTMENT RETURN OF     ANNUAL INVESTMENT RETURN OF
              END OF                 5% INTEREST     ------------------------------  -----------------------------
           POLICY YEAR                 PER YEAR         0%        6%        12%        0%        6%        12%
- ----------------------------------  --------------   --------  --------  ----------  -------  --------  ----------
<S>                                 <C>              <C>       <C>       <C>         <C>      <C>       <C>
1.................................        10,500      500,000   500,000     500,000    7,235     7,646       8,059
2.................................        21,525      500,000   500,000     500,000   13,379    14,632      15,938
3.................................        33,101      500,000   500,000     500,000   18,978    21,513      24,257
4.................................        45,256      500,000   500,000     500,000   25,241    29,504      34,304
5.................................        58,019      500,000   500,000     500,000   31,217    37,665      45,219
6.................................        71,420      500,000   500,000     500,000   36,916    46,012      57,110
7.................................        85,491      500,000   500,000     500,000   42,291    54,507      70,040
8.................................       100,266      500,000   500,000     500,000   47,352    63,170      84,142
9.................................       115,779      500,000   500,000     500,000   52,107    72,020      99,564
10................................       132,068      500,000   500,000     500,000   56,459    80,974     116,378
15................................       226,575      500,000   500,000     500,000   72,185   127,807     228,593
20 (age 65).......................       347,193      500,000   500,000     507,493   75,097   177,668     415,978
25................................       501,135      500,000   500,000     841,911   56,470   228,214     725,785
30................................       697,608            0   500,000   1,308,408        0   277,899   1,222,812
35................................       948,363            0   500,000   2,131,270        0   322,455   2,029,781
40................................     1,268,398            0   500,000   3,463,907        0   362,079   3,298,959
45................................     1,676,852            0   500,000   5,512,562        0   394,699   5,250,059
</TABLE>
 
ASSUMES NO POLICY LOAN OR WITHDRAWAL 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
TO THE DIVISIONS OF THE VARIABLE ACCOUNT AND THE DIFFERENT RATES OF RETURN OF
THE VARIABLE ACCOUNT.
 
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. THEY WOULD ALSO BE DIFFERENT IF PREMIUMS WERE PAID IN DIFFERENT
AMOUNTS OR FREQUENCIES THAN SHOWN. 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>
                FLEXIBLE PREMIUM VARIABLE LIFE INSURANCE POLICY
              SEX-NEUTRAL ISSUE AGE 45 -- SELECT UNDERWRITING RISK
                           $500,000 SPECIFIED AMOUNT
                             DEATH BENEFIT OPTION A
                             $10,000 ANNUAL PREMIUM
                          CASH VALUE ACCUMULATION TEST
                                CURRENT CHARGES
 
<TABLE>
<CAPTION>
                                                         DEATH BENEFIT                       CASH VALUE
                                                --------------------------------  --------------------------------
                                  PREMIUM         ASSUMING HYPOTHETICAL GROSS       ASSUMING HYPOTHETICAL GROSS
                               ACCUMULATED AT     ANNUAL INVESTMENT RETURN OF       ANNUAL INVESTMENT RETURN OF
           END OF               5% INTEREST     --------------------------------  --------------------------------
         POLICY YEAR              PER YEAR         0%         6%         12%         0%         6%         12%
- -----------------------------  --------------   --------  ----------  ----------  --------  ----------  ----------
<S>                            <C>              <C>       <C>         <C>         <C>       <C>         <C>
1............................        10,500      500,000     500,000     500,000     9,001       9,470       9,938
2............................        21,525      500,000     500,000     500,000    16,992      18,469      20,002
3............................        33,101      500,000     500,000     500,000    24,514      27,557      30,839
4............................        45,256      500,000     500,000     500,000    32,771      37,954      43,764
5............................        58,019      500,000     500,000     500,000    40,813      48,727      57,953
6............................        71,420      500,000     500,000     500,000    48,701      59,952      73,601
7............................        85,491      500,000     500,000     500,000    56,332      71,549      90,764
8............................       100,266      500,000     500,000     500,000    63,819      83,646     109,716
9............................       115,779      500,000     500,000     500,000    71,165      96,269     130,655
10...........................       132,068      500,000     500,000     500,000    78,373     109,447     153,799
15...........................       226,575      500,000     500,000     633,861   113,567     187,550     317,387
20 (age 65)..................       347,193      500,000     500,390   1,027,731   141,840     284,262     583,833
25...........................       501,135      500,000     631,884   1,586,392   159,737     401,966   1,009,168
30...........................       697,608      500,000     768,709   2,388,304   162,524     540,594   1,679,575
35...........................       948,363      500,000     915,082   3,553,438   136,320     698,820   2,713,654
40...........................     1,268,398      500,000   1,067,798   5,223,735    44,695     872,978   4,270,664
45...........................     1,676,852            0   1,224,822   7,595,840         0   1,055,796   6,547,614
</TABLE>
 
ASSUMES NO POLICY LOAN OR WITHDRAWAL 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
TO THE DIVISIONS OF THE VARIABLE ACCOUNT AND THE DIFFERENT RATES OF RETURN OF
THE VARIABLE ACCOUNT.
 
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. THEY WOULD ALSO BE DIFFERENT IF PREMIUMS WERE PAID IN DIFFERENT
AMOUNTS OR FREQUENCIES THAN SHOWN. 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>
                FLEXIBLE PREMIUM VARIABLE LIFE INSURANCE POLICY
              SEX-NEUTRAL ISSUE AGE 45 -- SELECT UNDERWRITING RISK
                           $500,000 SPECIFIED AMOUNT
                             DEATH BENEFIT OPTION A
                             $10,000 ANNUAL PREMIUM
                          CASH VALUE ACCUMULATION TEST
                               GUARANTEED CHARGES
 
<TABLE>
<CAPTION>
                                                             DEATH BENEFIT                    CASH VALUE
                                                     ------------------------------  -----------------------------
                                       PREMIUM        ASSUMING HYPOTHETICAL GROSS     ASSUMING HYPOTHETICAL GROSS
                                    ACCUMULATED AT    ANNUAL INVESTMENT RETURN OF     ANNUAL INVESTMENT RETURN OF
                                     5% INTEREST     ------------------------------  -----------------------------
        END OF POLICY YEAR             PER YEAR         0%        6%        12%        0%        6%        12%
- ----------------------------------  --------------   --------  --------  ----------  -------  --------  ----------
<S>                                 <C>              <C>       <C>       <C>         <C>      <C>       <C>
1.................................        10,500      500,000   500,000     500,000    7,235     7,646       8,059
2.................................        21,525      500,000   500,000     500,000   13,379    14,632      15,938
3.................................        33,101      500,000   500,000     500,000   18,978    21,513      24,257
4.................................        45,256      500,000   500,000     500,000   25,241    29,504      34,304
5.................................        58,019      500,000   500,000     500,000   31,217    37,665      45,219
6.................................        71,420      500,000   500,000     500,000   36,916    46,012      57,110
7.................................        85,491      500,000   500,000     500,000   42,291    54,507      70,040
8.................................       100,266      500,000   500,000     500,000   47,352    63,170      84,142
9.................................       115,779      500,000   500,000     500,000   52,107    72,020      99,564
10................................       132,068      500,000   500,000     500,000   56,459    80,974     116,378
15................................       226,575      500,000   500,000     500,000   72,185   127,807     228,593
20 (age 65).......................       347,193      500,000   500,000     715,520   75,097   177,668     406,472
25................................       501,135      500,000   500,000   1,050,331   56,470   228,214     668,157
30................................       697,608            0   500,000   1,487,001        0   277,899   1,045,734
35................................       948,363            0   500,000   2,061,929        0   322,455   1,574,634
40................................     1,268,398            0   500,000   2,823,235        0   362,079   2,308,136
45................................     1,676,852            0   500,000   3,836,833        0   394,699   3,307,350
</TABLE>
 
ASSUMES NO POLICY LOAN OR WITHDRAWAL 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
TO THE DIVISIONS OF THE VARIABLE ACCOUNT AND THE DIFFERENT RATES OF RETURN OF
THE VARIABLE ACCOUNT.
 
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. THEY WOULD ALSO BE DIFFERENT IF PREMIUMS WERE PAID IN DIFFERENT
AMOUNTS OR FREQUENCIES THAN SHOWN. 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.
 
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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 Executive Life
Northwestern Mutual Variable Life Account
Northwestern Mutual Series Fund, Inc.
Russell Insurance Funds


34-1011 (4-99)

PROSPECTUSES

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


NORTHWESTERN 
MUTUAL LIFE-Registered Trademark-
PO Box 3095
Milwaukee WI 53201-3095


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