MAIRS & POWER INCOME FUND INC
485BPOS, 1997-04-30
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<PAGE>

                                                     Registration Number 2-18269


                          SECURITIES AND EXCHANGE COMMISSION
                                Washington D.C.  20549

                                      FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

    Post-Effective Amendment No. 41

and

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940

    Amendment No. 41

                          Mairs and Power Income Fund, Inc.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                  (Exact Name of Registrant as Specified in Charter)
                         W-2062 First National Bank Building
                                 332 Minnesota Street
                               St. Paul, MN  55101-1363
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                (Address of Principal Executive Offices)    (Zip Code)

       Registrant's Telephone Number, Including Area Code:  (612) 222-8478
                             William B. Frels, President
                         W-2062 First National Bank Building
                                 332 Minnesota Street
                               St. Paul, MN  55101-1363
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       (Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box)

/ / immediately upon filing pursuant to paragraph  (b)
/X/ on April 30, 1997 pursuant to paragraph   (b)
/ / 60 days after filing pursuant to paragraph  (a)
/ / on (date) pursuant to paragraph  (a)  of Rule 485

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

The registrant has registered an indefinite number of shares of Common Stock,
par value $.10 per share, pursuant to Rule 24f-2 under the Investment Company
Act of 1940, as amended.  On February 25, 1997, the registrant filed a Rule
24f-2 Notice for the fiscal year ended December 31, 1996.

<PAGE>

                          MAIRS AND POWER INCOME FUND, INC.
                          ---------------------------------
                                CROSS REFERENCE SHEET
                                ---------------------
FORM N-1A ITEM

Part A - Prospectus                         Heading in Prospectus
- ---------------------------------------     ----------------------------------
1.  Cover Page                              Prospectus

2.  Synopsis                                Fund Expenses

3.  Condensed Financial Information         Financial Highlights

4.  General Description of Registrant       Investment Objective and Policies;
                                            the Fund; Risks

5.  Management of the Fund                  Management of the Fund

5A. Management's Discussion of Fund         Management's Discussion of Fund
    Performance                             Performance

6.  Capital Stock and Other Securities      The Fund; Distributions and Tax
                                            Consequences

7.  Purchase of Securities Offered          Purchasing Shares; Determining Net
                                            Asset Value Per Share

8.  Redemption or Repurchase                Redeeming Shares

9.  Pending Legal Proceedings               Not Applicable

Part B - Statement of Additional            Heading in Statement of Additional
Information                                 Information
- ---------------------------------------     ----------------------------------

10. Cover Page                              Statement of Additional Information

11. Table of Contents                       Table of Contents

12. General Information and History         Not Applicable

13. Investment Objectives and Policies      Investment Objective and Policies;
                                            Investment Limitation; Portfolio
                                            Turnover

14. Management of the Fund                  Officers and Directors

<PAGE>

                          MAIRS AND POWER INCOME FUND, INC.
                          ---------------------------------
                                CROSS REFERENCE SHEET
                                ---------------------

FORM N-1A ITEM

Part B - Statement of Additional            Heading in Statement of Additional
Information                                 Information
- ---------------------------------------     ----------------------------------

15. Control Persons and Principal           Officers and Directors; Principal
    Holders of Securities                   Holders of Securities

16. Investment Advisory and Other           Investment Adviser; Transfer Agent
    Services                                and Custodian

17. Brokerage Allocation and Other          Portfolio Transactions
    Practices

18. Capital Stock and Other Securities      (Included in Prospectus Under "The
                                            Fund")

19. Purchase, Redemption and Pricing        Purchasing and Redeeming Shares
    of Securities Being Offered

20. Tax Status                              (Included in Prospectus Under
                                            "Distributions and Tax
                                            Consequences")

21. Underwriters                            Not Applicable

22. Calculation of Performance Data         Not Applicable

23. Financial Statements                    Financial Statements
<PAGE>
                                MAIRS AND POWER
                                 BALANCED FUND
 
                                                 W-2062 FIRST NATIONAL BANK
                                                 BLDG.
                                                 332 MINNESOTA STREET
                                                 ST. PAUL, MN 55101-1363
                                                 612-222-8478
 
                                            OBJECTIVE
 
                                                 The objective of the Fund
                                                 (formerly known as the Mairs
                                                 and Power Income Fund) is to
                                                 provide regular current income,
                                                 the potential for capital
                                                 appreciation and a moderate
                                                 level of volatility by
                                                 investing in a diversified list
                                                 of securities including bonds,
                                                 preferred stocks, common stocks
                                                 and other securities
                                                 convertible into common stock.
 
                                                 This Prospectus, which should
                                                 be retained for future
                                                 reference, is designed to set
                                                 forth concisely the information
                                                 you should know before you
                                                 invest. A "Statement of
                                                 Additional Information" dated
                                                 April 30, 1997, and
                                                 incorporated herein by
                                                 reference, has been filed with
                                                 the Securities and Exchange
                                                 Commission. A copy of the
                                                 Statement may be obtained,
                                                 without charge, by writing to
                                                 or calling the Fund.
 
                                            A NO-LOAD FUND
 
                                                 There is no sales charge for
                                                 the purchase or sale of Fund
                                                 shares.
 
                                                 THESE SECURITIES HAVE NOT BEEN
                                                 APPROVED OR DISAPPROVED BY THE
                                                 SECURITIES AND EXCHANGE
                                                 COMMISSION OR ANY STATE
                                                 SECURITIES COMMISSION, NOR HAS
                                                 THE SECURITIES AND EXCHANGE
                                                 COMMISSION OR ANY STATE
                                                 SECURITIES COMMISSION PASSED
                                                 UPON THE ACCURACY OR ADEQUACY
                                                 OF THE PROSPECTUS. ANY
                                                 REPRESENTATION TO THE CONTRARY
                                                 IS A CRIMINAL OFFENSE.
PROSPECTUS
April 30, 1997
<PAGE>
- --------------------------------------------------------------------------------
                               TABLE OF CONTENTS
 
<TABLE>
<S>                                                                                       <C>
Fund Expenses...........................................................................          2
Condensed Financial Information.........................................................          3
Financial Highlights Chart..............................................................          3
Investment Objective and Policies.......................................................          4
Management of the Fund..................................................................          4
Management's Discussion of Fund Performance.............................................          5
Comparison Chart (Fund, S & P 500 Index, Consumer Price Index)..........................          5
The Fund................................................................................          6
Purchasing Shares.......................................................................          6
Redeeming Shares........................................................................          6
Distributions and Tax Consequences......................................................          7
Determining Net Asset Value Per Share...................................................          8
Other Services..........................................................................          8
Risks...................................................................................          8
</TABLE>
 
- --------------------------------------------------------------------------------
 
FUND EXPENSES
 
  The purpose of the following table is to assist investors in understanding the
various  costs and expenses that  an investor in the  Fund will bear directly or
indirectly, and importantly, to compare the expense of an investment in the Fund
with other similar investments.
 
<TABLE>
<S>                                                                          <C>
                           SHAREHOLDER TRANSACTION EXPENSES
Maximum Sales Load Imposed on Purchases....................................  None
Maximum Sales Load Imposed on Reinvested Dividends and Other
 Distributions.............................................................  None
Deferred Sales Load........................................................  None
Redemption Fees............................................................  None
Exchange Fee...............................................................  None
</TABLE>
 
<TABLE>
<S>                                                                          <C>
         ANNUAL FUND OPERATING EXPENSES FOR THE YEAR ENDED DECEMBER 31, 1996
                       (AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management Fees............................................................      0.60%
12b-1 Fees.................................................................      0.00
Other Expenses.............................................................      0.48
                                                                             ---------
Total Operating Expenses...................................................      1.08%
                                                                             ---------
</TABLE>
 
<TABLE>
<CAPTION>
               EXAMPLE                    1 year       3 years      5 years     10 years
                                        -----------  -----------  -----------  -----------
<S>                                     <C>          <C>          <C>          <C>
You would pay  the following  expenses
on  a $1,000  investment, assuming (1)
5% annual return and (2) redemption at
the end of each time period:             $      11    $      35    $      60    $     132
</TABLE>
 
Although this example is  based on actual  expenses in the  most recent year  it
should  not be  considered a representation  of past or  future expenses; actual
expenses in future years may be greater or less than those shown.
 
                                       2
<PAGE>
CONDENSED FINANCIAL INFORMATION
 
  The following table shows certain important financial information which may be
helpful  in evaluating the  Fund's results. The information  is derived from the
Fund's financial  statements, which  have been  audited by  Ernst &  Young  LLP,
independent auditors. The financial statements and auditors' report may be found
in  the Fund's most recent annual report  which may be obtained, without charge,
by writing to  or calling the  Fund at the  number listed on  the front of  this
Prospectus.
 
                              FINANCIAL HIGHLIGHTS
 
            (SELECTED PER SHARE DATA AND RATIOS -- FOR EACH SHARE OF
               CAPITAL STOCK OUTSTANDING THROUGHOUT EACH PERIOD)
 
<TABLE>
<CAPTION>
                                                                       YEAR ENDED DECEMBER 31
                                       1996     1995     1994     1993     1992     1991     1990     1989     1988     1987
                                      ----------------------------------------------------------------------------------------
<S>                                   <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>
 
PER SHARE
Net asset value, beginning of year    $ 65.39  $ 52.42  $ 56.38  $ 53.82  $ 53.34  $ 44.11  $ 45.78  $ 41.39  $ 39.08  $ 42.53
Investment operations:
  Net investment income                  2.19     2.01     2.09     2.00     2.00     1.98     2.12     2.13     2.24     2.00
  Net realized and unrealized gains
    (losses) on investments              9.38    13.55   (3.25)     3.79     1.07     9.24   (1.53)     5.07     3.14   (1.16)
                                      -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
Total from investment operations        11.57    15.56   (1.16)     5.79     3.07    11.22     0.59     7.20     5.38     0.84
Less distributions:
  Dividends (from net investment
    income)                            (2.20)   (2.04)   (2.06)   (1.98)   (1.99)   (1.99)   (2.13)   (2.15)   (2.23)   (2.11)
 
  Distributions (from capital gains)   (1.08)   (0.55)   (0.74)   (1.25)   (0.60)        -   (0.13)   (0.66)   (0.84)   (2.18)
                                      -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
Total distributions                    (3.28)   (2.59)   (2.80)   (3.23)   (2.59)   (1.99)   (2.26)   (2.81)   (3.07)   (4.29)
                                      -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
Net asset value, end of year          $ 73.68  $ 65.39  $ 52.42  $ 56.38  $ 53.82  $ 53.34  $ 44.11  $ 45.78  $ 41.39  $ 39.08
                                      -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
 
TOTAL INVESTMENT RETURN                 17.9%    30.0%   (2.1)%    10.9%     5.9%    25.9%     1.4%    17.7%    13.9%     1.7%
                                      -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
                                      -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
NET ASSETS, END OF YEAR (000'S
 OMITTED)                              20,565   16,979   12,973   13,442   11,536   10,676    8,075    7,886    6,570    5,772
 
RATIOS/SUPPLEMENTAL DATA:
  Ratio of expenses to average net
    assets                              1.08%    1.12%    1.11%    1.06%    1.13%    1.25%    1.20%    1.22%    1.22%    1.20%
  Ratio of net investment income to
    average net assets                  3.16%    3.47%    3.80%    3.50%    3.72%    4.02%    4.78%    4.78%    5.33%    4.43%
 
  Portfolio turnover rate               8.25%    3.95%   17.28%   24.10%   16.12%   24.37%   20.15%   14.18%   25.83%   20.83%
 
  Average commission rate paid        $ .1201        -        -        -        -        -        -        -        -        -
</TABLE>
 
                                       3
<PAGE>
INVESTMENT OBJECTIVE AND POLICIES
 
  The  Fund's  objective is  to provide  its  shareholders with  regular current
income,  the  potential  for  capital  appreciation  and  a  moderate  level  of
volatility  by investing  in a diversified  list of  securities including bonds,
preferred stocks, common  stocks and  other securities  convertible into  common
stock.  It is expected that the Fund's  assets will be invested in various types
of securities, the proportion of which will vary from time to time in accordance
with the judgment of Mairs and  Power, Inc., the Fund's investment adviser.  The
Fund  seeks to achieve its objective by investing  in a list of holdings that is
diversified by both security type and by industry. While it is expected that  at
least  25% of the Fund's assets will be invested in non-convertible fixed income
securities, the dominant portfolio  emphasis will be on  common stock and  other
securities  convertible into common stock. Assets of the Fund are expected to be
reasonably fully  invested  at all  times.  Cash equivalent  investments  (money
market  funds and other short-term investments) may be held from time to time as
a buying reserve  to better  enable the Fund  to meet  its objective.  Portfolio
turnover  is expected  to be relatively  modest when compared  to other balanced
mutual funds. Although the Fund will invest primarily in higher rated investment
grade fixed  income securities  (Baa or  better by  Moody's Investors  Service),
lower  rated fixed income securities may be  purchased if, in the opinion of the
Investment Adviser, the potential reward outweighs the incremental risk.
 
  A detailed description of  the Fund's investment  limitations is contained  in
the  Statement  of  Additional  Information.  Such  limitations  are fundamental
policies which  cannot be  changed without  the approval  of a  majority of  the
Fund's shareholders, as defined in the Statement of Additional Information.
 
MANAGEMENT OF THE FUND
 
  The  Board  of Directors  has overall  responsibility for  the Fund.  The Fund
employs Mairs  and  Power,  Inc.,  W-2062  First  National  Bank  Building,  332
Minnesota  Street,  St. Paul,  MN 55101-1363,  to  manage the  Fund's investment
portfolio and certain other business  affairs under a contract that  compensates
Mairs  and Power, Inc. at the rate of one-twentieth of one percent of the Fund's
month-end net asset value (0.6% annually),  computed and paid each month.  Mairs
and  Power, Inc. has managed mutual funds since 1958 and has provided investment
counsel services in St. Paul since 1931.
 
  William B. Frels,  Vice President and  Treasurer of Mairs  and Power, Inc.  is
primarily responsible for the day-to-day management of the Fund's portfolio. Mr.
Frels  has been  an officer and  director of  Mairs and Power,  Inc. since July,
1992. Prior to that time he was  a Vice President and Senior Investment  Officer
for  American  National  Bank and  Trust  Company  of St.  Paul,  Minnesota from
September 1990 to June 1992.
 
  Mairs and  Power,  Inc.  acts  as  the  Fund's  Transfer  Agent  and  Dividend
Disbursing  Agent  and  is  reimbursed  for  all  expenditures  incurred  in the
discharge of these duties. The  ratio of the transfer  agent fee to average  net
assets in 1996 was 0.11%.
 
  Effective May 1, 1996, Firstar Trust Company was retained as Custodian for the
Fund  pursuant to  the terms  of a  custodial agreement  which must  be approved
annually by  the  Board  of  Directors.  Prior to  May  1,  1996,  Norwest  Bank
Minnesota,  N.A. acted as Custodian for the Fund. Firstar Trust Company controls
all securities  and  cash  for  the  Fund,  receives  and  pays  for  securities
purchased,  delivers against payment for  securities sold, receives and collects
income from investments, makes all payments for Fund expenses and performs other
administrative services, all as  directed in writing  by authorized officers  of
the  Fund. The  ratio of  the custodial fee  to average  net assets  in 1996 was
0.03%.
 
  The ratio of the management  fee to average net assets  in 1996 was 0.6%;  the
ratio  of total Fund operating expenses  to average net assets ("expense ratio")
was 1.08%. Mairs and Power, Inc. has agreed with the Fund that the expense ratio
will not exceed the lowest expense limitation  of any state in which the  Fund's
shares are sold.
 
                                       4
<PAGE>
MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE
 
1996 IN REVIEW
 
  Looking  back over the past  year, the Fund set a  number of records just like
the overall stock market. The Fund's total  net assets and net assets per  share
both reached all-time highs during the year. The total investment return for the
full  year reached 17.9% after adjustment for the reinvestment of cash dividends
and capital  gain distributions.  This  compared to  returns  of 23.0%  for  the
Standard & Poor's Stock Index and 2.9% for the Lehman Brothers Gov't./Corp. Bond
Index.  The Fund did relatively well compared  to other balanced mutual funds as
represented by  a  CDA/Wiesenberger universe  of  314 funds  which  produced  an
average return of 13.2% in 1996.
 
  The  near perfect stock market environment  of recent years continued in 1996.
Full year real GDP rose  at a moderate 2.5% rate  compared to 2.0% the  previous
year.  Inflation remained well contained with  the GDP deflator pretty stable at
2.1% and  the  Consumer Price  Index  inching up  only  slightly more  to  3.3%.
Corporate  profits again grew nicely at around  10% in response to steady demand
growth and continuing productivity improvement. Historically high net investment
in mutual  funds provided  the liquidity  to  move stock  prices higher  in  the
absence of more attractive investment alternatives. Over the course of the year,
the  Fund continued to hold more than half of its assets in common stocks (62.8%
at year end) with the balance invested in a combination of bonds (corporate  and
Federal  Government),  convertible bonds  and  preferred stock  (convertible and
non-convertible). The fund  remained pretty fully  invested throughout the  year
with cash reserves of only 2.7% at year end.
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
COMPARISON OF CHANGE IN VALUE OF $10,000 INVESTMENT
  IN FUND, S&P 500 INDEX, AND THE CONSUMER PRICE
                       INDEX
<S>                                                  <C>        <C>        <C>
                                                          Fund        S&P        CPI
1986                                                     10000      10000      10000
1987                                                     10172      10520      10370
1988                                                     11586      12266      10795
1989                                                     13633      16142      11313
1990                                                     13819      15626      11924
1991                                                     17395      20392      12425
1992                                                     18414      21962      12798
1993                                                     20412      24180      13143
1994                                                     19987      24494      13498
1995                                                     25992      33690      13836
1996                                                     30652      41432      14292
Average Annual Total Return
                                                        1 Year     5 Year    10 Year
                                                         17.9%      12.0%      11.9%
Past investment results should not
be taken as necessarily representative
of future performance.
</TABLE>
 
                                       5
<PAGE>
THE FUND
 
  The  Fund  is issued  by Mairs  and  Power Income  Fund, Inc.,  an open-ended,
diversified management company which was incorporated in Minnesota in 1961.  The
Fund  has authorized  capital stock  of 10,000,000  shares, $0.10  par value per
share. Each  share entitles  the holder  to one  vote at  all meetings  of  Fund
shareholders  and to participate equally in dividends and distributions declared
by the Fund, and in its  remaining net assets on liquidation after  satisfaction
of  outstanding liabilities. Fund shares are  fully paid and non-assessable when
issued, have  no  preemptive,  conversion,  or  cumulative  voting  rights,  are
transferable without restrictions and are redeemable at net asset value.
 
PURCHASING SHARES
 
  Shares  of the  Fund may  be purchased,  with no  sales charge,  at the Fund's
office in St. Paul.  Shares are purchased at  the next-computed net asset  value
after receipt and acceptance of a purchase application in proper form. Net asset
value  will be  calculated as  of the  close of  trading of  the New  York Stock
Exchange on the last business day of each week (normally a Friday), on the final
business day of  each month, and  on any day  in which an  order to redeem  Fund
shares  is received  (a "special" valuation).  All subscriptions  are subject to
acceptance by  authorized officers  of the  Fund and  are not  binding until  so
accepted. An initial purchase must be a least $2,500 ($1,000 for an IRA account)
and  each subsequent purchase must be at  least $100, although the Fund reserves
the right to waive or change these minimums at its discretion. The Fund will not
accept currency. Stock  certificates will  not ordinarily be  issued unless  the
investor  requests a  certificate in  writing. The  Fund will  invest the entire
dollar amount of  each purchase order  in full and  fractional Fund shares  and,
unless  otherwise  instructed, will  reinvest all  income dividends  and capital
gains distributions in  additional full  and fractional  shares. Investors  may,
however,  request that  income dividends  and/or capital  gains distributions be
paid in cash.
 
REDEEMING SHARES
 
  Shareholders may  redeem  for  cash  all  or a  portion  of  their  shares  by
instructing  the Fund at its office in St.  Paul. Shares will be redeemed at the
net asset value next computed after the receipt of a redemption order.  Although
the  net asset value of Fund shares is  normally determined only as of the close
of trading  on the  New York  Stock Exchange  each Friday  and at  month-end,  a
special  net asset value determination will be made  as of the close of New York
Stock Exchange trading  on any  day that  an order  for the  redemption of  Fund
shares  is received.  A redemption  request must be  in "good  order" before the
proceeds can be released. This means the following will be required:
 
(a) A  letter of  instruction or  a stock  assignment specifying  the number  of
    shares  or dollar amount to be redeemed,  signed by all owners of the shares
    exactly as  their  names  appear  in  the  Fund's  shareholder  records.  If
    certificates  have been issued representing shares to be redeemed, they must
    accompany the letter.
 
(b) A  guarantee  of  the signature  of  each  owner by  an  eligible  signature
    guarantor  such as a U.S.  commercial bank, trust company,  or member of the
    New York Stock Exchange for redemption requests greater than $10,000.
 
(c) In the case of estates, trusts, guardianships, custodianships,  corporations
    and  pension and profit-sharing plans,  other supporting legal documents may
    be required.
 
(d) A  guarantee  of  the signature  of  each  owner by  an  eligible  signature
    guarantor  such as a U.S.  commercial bank, trust company,  or member of the
    New York Stock Exchange if the address of record has been changed within the
    15 days preceding any liquidation.
 
  If the proceeds of any redemption are requested to be made payable to or  sent
to  other  than the  address  of record,  signature(s)  on the  request  must be
guaranteed by an eligible signature guarantor  such as a commercial bank,  trust
company, or a member of the New York Stock Exchange.
 
                                       6
<PAGE>
  If  any portion of the shares to  be redeemed represents an investment made by
check, the  Fund may  delay the  payment of  the redemption  proceeds until  the
Transfer  Agent is reasonably satisfied that the check has been collected, which
may take up to twelve days from the purchase date.
 
  Payment for shares redeemed will be mailed to you typically within one or  two
business  days, but no later than the  seventh business day after receipt by the
Transfer Agent of the redemption request  in good order, or within such  shorter
period as may legally be required.
 
  The  Fund may  be required  to withhold federal  income tax  at a  rate of 31%
(backup withholding)  from  dividend  payments,  distributions,  and  redemption
proceeds  if a  shareholder fails  to furnish  the Fund  with his  or her social
security or tax identification  number. The shareholder  also must certify  that
the  number is correct and that he or  she is not subject to backup withholding.
The certification is included as part of the share purchase application form. If
the shareholder  does  not have  a  social security  number,  he or  she  should
indicate on the purchase form that an application to obtain a number is pending.
The  Fund is required to withhold taxes if a number is not delivered to the fund
within seven days.
 
  No redemption  request will  become effective  until all  documents have  been
received in proper form by the Fund. The shareholder should contact the Fund for
further  information concerning documentation required  for a redemption of Fund
shares.
 
  Shareholders who have an IRA or  other retirement plan must indicate on  their
redemption  request whether  or not to  withhold federal  income tax. Redemption
requests failing  to indicate  an election  not  to have  tax withheld  will  be
subject to withholding.
 
  The  right  of redemption  may  be suspended  or the  date  of payment  may be
postponed (1) during weekend or holiday closings, or when trading is  restricted
as  determined by the Securities and Exchange Commission ("SEC"), (2) during any
period when an emergency exists as determined by the SEC as a result of which it
is not reasonably practicable for the Fund to dispose of securities owned by  it
or to fairly determine the value of its net assets, and (3) for such a period as
the  SEC may permit.  A redemption order may  not be canceled  or revoked by the
shareholder once redemption instructions have been received and accepted by  the
Fund.  Since the redemption price is net asset value per share determined at the
same time and in the same manner as for a purchase order received at that  time,
it  reflects  the  market  value  of  the  Fund's  investments  at  the  time of
redemption. This value may be  more or less than  the price originally paid  for
the shares, and the investor may realize a gain or loss on redemption.
 
DISTRIBUTIONS AND TAX CONSEQUENCES
 
  The  Fund distributes all of its net  investment income to shareholders in the
form of quarterly dividends, normally in March, June, September and December. If
net capital gains are realized, the  Fund will distribute them near year-end  in
the year in which such gains are realized. The Fund intends to comply, as it did
in  1996, with the  special provisions of  Subchapter M of  the Internal Revenue
Code that  relieve it  from federal  income  tax on  net investment  income  and
capital  gains currently distributed to  shareholders. The Internal Revenue Code
requires all regulated investment  companies to pay a  non deductible 4%  excise
tax if at least 98% of ordinary income and 98% of capital gains are not paid out
to  shareholders during the year in which  they are earned or realized. The Fund
intends to distribute income and capital gains in such a manner as to avoid  the
imposition of this excise tax.
 
  Fund  shareholders will be subject to federal  income tax at ordinary rates on
distributions of investment income  and short-term capital gains.  Distributions
of  net long-term  capital gains are  taxable to Fund  shareholders as long-term
capital gain regardless  of the  length of  time shares  of the  Fund are  held.
Short-term  capital gains are taxed at the same rate as an individual's ordinary
income; long-term capital gains  are taxed at a  maximum rate of 28%.  Dividends
and  distributions will  be taxable  whether received  in cash  or reinvested in
additional shares of the Fund.
 
                                       7
<PAGE>
Shareholders will be advised annually as to the source of distributions for  tax
purposes.   Distributions  may  also  be  subject  to  state  and  local  taxes.
Shareholders not subject to  tax on income  will not be required  to pay tax  on
amounts distributed from the Fund.
 
  The  Fund's dividends and distributions are paid  on a per share basis. At the
time of such payment, therefore, the value of each share will be reduced by  the
amount  of the payment. If shares are  purchased shortly before the payment of a
dividend or a capital gains distribution, purchasers will pay the full price for
the shares and then receive some portion of the price back as a taxable dividend
or distribution.
 
  The foregoing is a general summary of current federal income tax law regarding
the Fund. Investors should consult with their own tax adviser regarding federal,
state and local tax consequences of an investment in the Fund.
 
DETERMINING NET ASSET VALUE PER SHARE
 
  The net asset value per share for purchase and redemption orders is determined
on the  days  set  forth  under  the  paragraphs  for  "Purchasing  Shares"  and
"Redeeming  Shares," as of the  close of regular trading  hours on the New Stock
Exchange (currently 3:00  p.m., Central  time) on each  day the  New York  Stock
Exchange is open for trading. As a result, shares of the Fund will not be priced
on  the days which the Exchange observes:  New Year's Day, Presidents' Day, Good
Friday,  Memorial  Day,  Independence  Day,  Labor  Day,  Thanksgiving  Day  and
Christmas Day. The net asset value per share is determined by dividing the total
market value of the Fund's investment and other assets, less any liabilities, by
the total outstanding shares of the Fund. Each security traded on one or more of
the  national securities  exchanges are  valued at  the last  sale price  on the
securities exchange on which such securities are primarily traded or a the  last
sale price on the national securities market, or on the day of the valuation, or
if  there were  no sales  on that day,  the most  recent sales  price. All other
securities are valued  at the  mean between  the bid  and the  asked price.  For
securities  where quotations are not readily available, or where the last quoted
price is not considered representative of the value of that security if it  were
to  be sold on that day, the security will be valued at fair value as determined
in good faith by Mairs and Power, Inc.
 
  The Fund's  securities  may be  valued  based  on valuations  provided  by  an
independent  pricing service. These valuations are  reviewed by Mairs and Power,
Inc. If  Mairs and  Power, Inc.  believes  that a  valuation received  from  the
service does not represent a fair value, it values the security by a method that
Mairs and Power, Inc. believes will determine a fair value.
 
OTHER SERVICES
 
  Shareholder  Reports  -- Shareholders  will  receive a  confirmation statement
reflecting each purchase  and redemption  of Fund  shares, as  well as  periodic
statements  detailing distributions made by the Fund. In addition, the Fund will
send shareholders quarterly  and annual reports  showing its portfolio  holdings
and will provide tax information annually.
 
  Systematic  Withdrawals  --  Shareholders  may arrange  to  have  quarterly or
monthly withdrawals of cash from an  account by sending a systematic  withdrawal
request  to  the  Fund.  Withdrawal payments  are  derived  from  liquidation of
sufficient shares from a shareholder's account to meet the designated  payments.
The  withdrawal plan may be  terminated at any time by  writing to the Fund. The
minimum investment to establish a systematic withdrawal program is $10,000.
 
  Retirement Plans -- The Fund sponsors IRA, SEP-IRA and Keogh retirement plans,
information on which is available on request from the Fund's office in St. Paul.
 
RISKS
 
  All investments have risks.  Although the Fund cannot  eliminate all risk,  it
seeks  to  moderate  risk by  investing  in a  diversified  portfolio. Long-term
investors, for  whom  the  Fund  is  designed,  should  be  prepared  to  accept
 
                                       8
<PAGE>
fluctuations  in portfolio  value as  the Fund  seeks to  achieve its investment
objective of  regular  current  income  along with  the  potential  for  capital
appreciation.  There can be no assurance, of  course, that the Fund will achieve
its objective.
 
  The Fund  is subject  to the  general risk  of adverse  market conditions  for
equity  securities,  which include  common and  preferred stocks  and securities
convertible into  common  stock. The  market  prices of  equity  securities  are
generally  subject to greater volatility than prices of fixed income securities,
such as  bonds  and other  debt  obligations. Although  equity  securities  have
generally  demonstrated long-term increases in value, their prices may fluctuate
markedly over the short  term due to changing  market conditions, interest  rate
fluctuations and various economic and political factors.
 
  The  debt securities  in which  the Fund invests  are subject  to credit risk,
which is the risk that the issuer of a debt security will fail to make  payments
when  due. Corporate bonds and certain debt securities issued by agencies of the
United States are also  subject to call  risk, which is the  risk that the  debt
will be redeemed prior to its maturity. This risk increases when market interest
rates  are  declining, because  issuers may  find it  desirable to  refinance by
issuing new bonds at lower interest rates.
 
  Fixed-rate debt securities are  also subject to interest  rate risk, which  is
the  risk  that the  value of  a fixed-rate  debt security  will decline  due to
changes in market  interest rates.  In general,  when interest  rates rise,  the
value  of a fixed-rate  debt security declines.  Conversely, when interest rates
decline, the value of a fixed-rate debt security generally increases. The length
of maturity of the Fund's debt  securities may also affect the price  volatility
of  the Fund's  portfolio, because  debt securities  with longer  maturities are
subject  to  greater  price  volatility   than  debt  securities  with   shorter
maturities.
 
                                       9
<PAGE>
                             OFFICERS AND DIRECTORS
- --------------------------------------------------------------------------------
 
William B. Frels ........................................ President and Director
 
George A. Mairs, III .................................... Secretary and Director
 
Peter G. Robb ...................................... Vice President and Director
 
Lisa J. Hartzell ..................................................... Treasurer
 
Litton E. S. Field .................................................... Director
 
Donald E. Garretson ................................................... Director
 
J. Thomas Simonet ..................................................... Director
 
<TABLE>
<S>                                <C>
INVESTMENT ADVISER                 CUSTODIAN
 
Mairs and Power, Inc.              Firstar Trust Company
W-2062 First National Bank         615 East Michigan Street
Building                           P.O. Box 701
332 Minnesota Street               Milwaukee, Wisconsin 53201-0701
Saint Paul, Minnesota 55101-1363
 
TRANSFER AGENT                     INDEPENDENT AUDITORS
 
Mairs and Power, Inc.              Ernst & Young LLP
W-2062 First National Bank         1400 Pillsbury Center
Building                           200 South Sixth Street
332 Minnesota Street               Minneapolis, Minnesota 55402
Saint Paul, Minnesota 55101-1363
</TABLE>
 
                                       10
<PAGE>
                                MAIRS AND POWER
                                 BALANCED FUND
                                   PROSPECTUS
 
                                 APRIL 30, 1997
<PAGE>

                            MAIRS AND POWER BALANCED FUND

                         STATEMENT OF ADDITIONAL INFORMATION

                                 Dated April 30, 1997

    Mairs and Power Balanced Fund (the "Fund") (formerly known as the Mairs 
and Power Income Fund) is a no-load mutual fund that has as its investment 
objective to provide regular current income along with the potential 
for capital appreciation and a moderate level of volatility by investing in a 
diversified list of securities including bonds, preferred stocks, common 
stocks and other securities convertible into common stock.  The Fund is 
issued by Mairs and Power Income Fund, Inc., a Minnesota corporation.

    This Statement of Additional Information is not a prospectus, but 
contains information in addition to and more detailed than what is contained 
in the Fund's Prospectus.  It should be read in conjunction with the 
Prospectus, dated April 30, 1997, which has been filed with the Securities 
and Exchange Commission and can be obtained, without charge, by calling or 
writing the Fund.  This Statement of Additional Information has been 
incorporated by reference into the Prospectus.  The address of the Fund is 
W-2062 First National Bank Building, 332 Minnesota Street, St. Paul, MN 
55101-1363 and its telephone number is (612) 222-8478.

                                  Table of Contents


Investment Objective and Policies. . . . . . . . . . . . . . . . . . .   2

Investment Limitations . . . . . . . . . . . . . . . . . . . . . . . .   2

Portfolio Turnover . . . . . . . . . . . . . . . . . . . . . . . . . .   3

Purchasing and Redeeming Shares. . . . . . . . . . . . . . . . . . . .   3

Principal Holders of Securities. . . . . . . . . . . . . . . . . . . .   3

Officers and Directors . . . . . . . . . . . . . . . . . . . . . . . .   3

Investment Adviser . . . . . . . . . . . . . . . . . . . . . . . . . .   5

Transfer Agent and Custodian . . . . . . . . . . . . . . . . . . . . .   5

Portfolio Transactions . . . . . . . . . . . . . . . . . . . . . . . .   6

Financial Statements . . . . . . . . . . . . . . . . . . . . . . . . .   6

<PAGE>

INVESTMENT OBJECTIVE AND POLICIES

    As discussed in "Investment Objective and Policies" in the Fund's 
Prospectus, the Fund will normally invest in a diversified list of 
securities, including bonds, preferred stocks, common stocks, and other 
securities convertible into common stock.  The percentage of the Fund's 
assets that may be held in each category will vary in accordance with the 
judgment of the Fund's investment adviser, Mairs and Power, Inc.  While 
equities and securities convertible into equities are expected to remain the 
dominant holdings in the Fund, it is expected that at least 25% of the Fund's 
assets will be invested in non-convertible fixed income securities. It is 
also the objective of the Fund to provide a current income yield of at least 
25% greater than that of the Standard & Poor's 500 Stock Index, although 
there can be no assurance that this objective will be met.

INVESTMENT LIMITATIONS

    The Fund is subject to the following restrictions which may not be 
changed without the approval of a majority of the shareholders of the Fund.  
The vote of a majority of the shareholders means the vote, at the annual or a 
special meeting of the security holders, of holders representing (a) 67% or 
more of the voting securities present at such meeting, if the holders of more 
than 50% of the outstanding voting securities are present or represented by 
proxy; or (b) more than 50% of the outstanding voting securities, whichever 
is less.  The Fund may not:

    (1)  Purchase securities of any issuer if as a result, (a) more than 5% 
         of the value of the total assets of the Fund would then be invested 
         in the securities of a single issuer (other than U.S. Government     
         obligations), or (b) more than 10% of any class of securities, or 
         more than 10% of the outstanding voting securities, of the issuer 
         would then be held by the Fund;

    (2)  Purchase securities of other investment companies if as a result more 
         than 5% of the Fund's total assets would then be (a) invested in the 
         securities of that investment company, or (b) more than 10% of the 
         Fund's assets would then be invested in securities of all investment 
         companies;

    (3)  Concentrate more than 20% of its investments in a particular industry;

    (4)  Purchase or sell real estate, real estate investment trusts, or other 
         interests in real estate which are not readily marketable;

    (5)  Write, purchase or sell puts, calls, or combinations thereof;

    (6)  Make loans (although it may acquire portions of an issuer's publicly 
         distributed securities);

    (7)  Purchase securities on margin or sell short;

    (8)  Borrow money, except that the Fund may borrow from banks up to 5% of 
         its total assets to pay capital gains distributions, to pay income 
         dividends, or to relieve an extraordinary or emergency situation, but 
         not for investment purposes;

    (9)  Mortgage, pledge, hypothecate, or in any manner transfer, as security 
         for indebtedness, any securities owned or held by the Fund;

    (10) Participate on a joint or a joint and several basis in any trading 
         account in securities;


                                          2

<PAGE>



    (11) Invest in companies for the purpose of exercising control of 
         management;

    (12) Act as an underwriter of securities of other issuers;

    (13) Purchase or retain the securities of any issuer if officers and 
         directors of the Fund or its investment adviser who own individually 
         more than one-half of one percent of the securities of such issuer, 
         together own more than 5% of the securities of such issuer;

    (14) Purchase or sell commodities or commodity contracts in the ordinary 
         course of its business;

    (15) Purchase or sell "restricted securities" in such a way as to become an
         "underwriter" within the meaning of that term as used in the   
         Securities Act of 1933.

PORTFOLIO TURNOVER

    The following table sets forth the annual portfolio turnover rates for the
Fund for the periods indicated.  

                                            Year Ended
                                            December 31,
                                          1996      1995
                                          ----      ----
       Common Stocks                      3.40%     3.22%
       All Other Securities               4.85%     0.73%

    The Fund has not placed any limit on its rate of portfolio turnover and 
securities may be sold without regard to the time they have been held when in 
the opinion of the Investment Adviser investment considerations warrant such 
action.  Portfolio turnover rate is calculated by dividing the lesser of the 
Fund's annual sales or purchases of portfolio securities (exclusive of 
securities with maturities of one year or less at the time the Fund acquired 
them) by the monthly average value of the securities in the Fund's portfolio 
during the year.

PURCHASING AND REDEEMING SHARES

    The purchase and redemption of the Fund's shares are subject to the 
procedures described in "Purchasing Shares" and "Redeeming Shares" in the 
Fund's Prospectus, which is incorporated herein by reference.

PRINCIPAL HOLDERS OF SECURITIES

    As of March 31, 1997, the only shareholder holding more than 5% of the 
Fund's outstanding shares was Smyth Profit Sharing and Savings Plan, St. 
Paul, MN (24,195 shares or 8.4%).

OFFICERS AND DIRECTORS

    The Officers and Directors of the Fund and their principal occupations 
for the last five years are set forth below.  Unless otherwise noted, the 
address for each Director and Officer is 332 Minnesota Street, W-2062 First 
National Bank Bldg., St. Paul, MN  55101.

                                          3

<PAGE>

<TABLE>
<CAPTION>

                             Position(s) Held         Principal Occupation(s) During 
Name, Address and Age        With Registrant          Past 5 Years             
- -------------------------    ----------------         ------------------------------------------
<S>                          <C>                      <C>

William B. Frels,* 68        President and            Vice President and Secretary of the
                             Director                 Investment Adviser (July 1992 to Present);
                                                      Vice President and Senior Investment
                                                      Officer, American National 
                                                      Bank and Trust Company of St. Paul, MN
                                                      (September 1990 to June 1992)

George A. Mairs, III,* 57    Secretary and            President of the Investment Adviser
                             Director

Peter G. Robb,* 48           Vice President           Vice President of the Investment Adviser 
                             and Director             (June 1994 to Present); Vice President and
                                                      Portfolio Manager, First Trust N.A., 
                                                      St. Paul, MN (June 1986 to April 1994)

Lisa J. Hartzell, 52         Treasurer                Manager of Mutual Fund Services of the 
                                                      Investment Adviser (May 1996 to Present);
                                                      Fund Administrator of the Investment 
                                                      Adviser (February 1993 to April 1996);
                                                      Paralegal, Oppenheimer Wolff & Donnelly
                                                      Law Firm (October 1983 to February 1993)

Litton E.S. Field, 74        Director                 Chairman, T.C. Field & Co. Insurance
530 North Robert Street                               Agency
St. Paul, MN  55101

Donald E. Garretson, 75      Director                 Retired Vice President, 3M Company
709 Linwood Avenue
St. Paul, MN  55105

J. Thomas Simonet, 70        Director                 Retired Chief Executive Officer, First
315 Stonebridge Blvd.                                 Trust Company
St. Paul, MN  55105

</TABLE>

*Interested person of the Fund, as defined in the Investment Company Act of
1940.

    All of the above listed persons serve in the same officer and/or director 
capacities with Mairs and Power Growth Fund, Inc., an open-end investment 
company which also retains Mairs and Power, Inc. as its investment adviser, 
except that Mr. Mairs is President and Mr. Frels is Secretary of that fund.

    The Fund's non-interested Directors are members of the Audit Committee 
which makes recommendations to the Board regarding the selection of auditors 
and confers with the auditors regarding the scope and results of the annual 
audit. The Fund does not pay any remuneration to its officers and Directors 
other than fees to Directors who are not officers, directors, employees or 
holders of 5% or more of the outstanding voting securities of the Fund's 
Investment Adviser, which 


                                       4

<PAGE>

totaled $4,725 in 1996.  As of March 31, 1997, the Directors and Officers of 
the Fund, as a group, and their spouses and minor children owned beneficially 
9,638 shares, or 3.3% of the Fund.

INVESTMENT ADVISER

    Mairs and Power, Inc., a Minnesota corporation, is the Investment Adviser 
of the Fund.  Mairs and Power, Inc. shareholders, all of whom are officers 
and directors of the Fund, along with their percentage ownership positions in 
Mairs and Power, Inc., are listed below:

                   George A. Mairs, III          44.4%
                   William B. Frels              35.4%
                   Peter G. Robb                 19.5%

    Mairs and Power, Inc. has furnished continuous investment supervision to 
the Fund since 1961.  Mairs and Power, Inc. currently provides similar 
services to one other mutual fund, Mairs and Power Growth Fund, Inc., the net 
assets of which as of December 31, 1996 were $150,161,759.

    Mairs and Power, Inc. serves as Investment Adviser to the Fund under the 
terms of an Investment Advisory Agreement dated March 20, 1972.  The 
Investment Advisory Agreement must be approved annually by the Board of 
Directors of the Fund, including a majority of those directors who are not 
parties to such contract or "interested persons" of any such party as defined 
in the Investment Company Act of 1940, by vote cast in person at a meeting 
called for such purpose.  The Agreement may be terminated at any time, 
without penalty, on sixty days' written notice by the Fund's Board of 
Directors, by the holders of a majority of the Fund's outstanding voting 
securities or by the Investment Adviser.  The Agreement automatically 
terminates in the event of its assignment (as defined in the Investment 
Company Act of 1940 and the rules thereunder).

    As compensation for its services to the Fund, the Investment Adviser 
receives monthly compensation at the rate of one-twentieth of one percent of 
month-end net asset value (0.6% annually), computed and paid each month.  The 
ratio of the management fee to average net assets in 1996 was 0.6%; the ratio 
of total expenses to average net assets was 1.08%.  Mairs and Power, Inc. has 
agreed with the Fund that the expense ratio will not exceed the expense 
limitation of any state in which the Fund's share are sold.
 
    Advisory fees paid by the Fund to Mairs and Power, Inc. amounted to 
$113,288 in 1996, $90,626 in 1995, and $81,084 in 1994.  Under the terms of 
the Investment Advisory Agreement, the Investment Adviser agrees to render 
research, statistical and advisory services to the Fund, pay for office 
rental, executive salaries and executive expenses and pay all expenses 
related to the distribution and sale of Fund shares.  All other expenses, 
such as brokerage commissions, fees charged by the Securities and Exchange 
Commission, custodian and transfer agent fees, legal and auditing fees, 
taxes, premiums on fidelity bonds, supplies, and all other miscellaneous 
expenses are borne by the Fund.  No compensation was paid to any other 
director or officer of the Fund.

TRANSFER AGENT AND CUSTODIAN

    Mairs and Power, Inc. acts as the Fund's Transfer Agent and Dividend 
Disbursing Agent and is reimbursed for all expenditures incurred in the 
discharge of these responsibilities.  Reimbursements amounted to $20,177 in 
1996, $18,833 in 1995, and $19,196 in 1994.


                                       5

<PAGE>

    Custodial services for the Fund are performed by Firstar Trust Company, 
615 East Michigan Street, Milwaukee, WI  53201, pursuant to the terms of a 
Custodial Agreement reviewed annually by the Board of Directors.  As 
Custodian, Firstar Trust Company controls all securities and cash for the 
Fund, receives and pays for securities purchased, delivers against payment 
for securities sold, receives and collects income from investments, makes all 
payments for Fund expenses and performs other administrative services, as 
directed in writing by authorized officers of the Fund.  For these services, 
Firstar Trust Company received $2,329 for the period May 1, 1996 through 
December 31, 1996.  Prior to May 1, 1996, Norwest Bank Minnesota, N.A. acted 
as Custodian for the Fund.  For their services as Custodian, Norwest Bank 
Minnesota N.A. received $2,581 in 1996, $14,100 in 1995, and $15,287 in 1994.

PORTFOLIO TRANSACTIONS

    Subject to policies established by the Board of Directors of the Fund, 
the Investment Adviser is responsible for the Fund's portfolio decisions and 
the placing of orders to effect the Fund's portfolio transactions.  With 
respect to such transactions, the Investment Adviser seeks to obtain the best 
net results for the Fund taking into account such factors as price (including 
the applicable brokerage commission or dealer spread), size of order, 
difficulty of execution and operational facilities of the firm involved.  
While the Investment Adviser generally seeks reasonably competitive 
commission rates, the Fund will not necessarily be paying the lowest 
commission or spread available.  The Fund has no obligation to deal with any 
broker or dealer in the execution of its portfolio transactions, and there is 
no affiliation between the Fund's officers or directors, or its Investment 
Adviser, and any broker-dealer or affiliated persons of any broker-dealer who 
executes transactions for the Fund.

    Investment decisions for the Fund are made independently from those of 
Mairs and Power Growth Fund, Inc., also managed by Mairs and Power, Inc.  
When these funds are simultaneously engaged in the purchase or sale of the 
same securities the transactions are averaged as to price and allocated as to 
amount in accordance with a formula deemed equitable to each fund.  In some 
cases this system may adversely affect the price paid or received by the 
Fund, or the size of the position obtainable for the Fund.

    Decisions with respect to allocations of portfolio brokerage will be made 
by the Investment Adviser.  Portfolio transactions are normally placed with 
broker-dealers which provide the Fund's Investment Adviser with research and 
statistical assistance.  Recognizing the value of these factors, the Fund may 
pay brokerage commissions in excess of those which another broker might 
charge for effecting the same transaction, even though the research services 
furnished by brokers through whom the Fund effects securities transactions 
may benefit other clients of Mairs and Power, Inc.

    For the year 1996, the Fund paid $4,554 in brokerage fees on purchase and
sale of portfolio securities.  All of this amount was paid to brokers or dealers
who supplied research services to the Investment Adviser.  Total brokerage fees
for 1995 and 1994 amounted to $2,756 and $6,927, respectively.

FINANCIAL STATEMENTS

    The Fund's financial statements, including a listing of portfolio 
securities as of December 31, 1996, are included in the Fund's Annual Report 
to Shareholders for the year ended December 31, 1996 and are incorporated 
herein by reference.  The financial statements have been audited by Ernst & 
Young LLP, independent auditors, 1400 Pillsbury Center, 200 South Sixth 
Street, Minneapolis, 


                                       6

<PAGE>

Minnesota 55402, as set forth in their report appearing 
in the Annual Report and incorporated herein by reference.  Additional copies 
of the Annual Report may be obtained, without charge, by writing or calling 
the Fund.


                                       7
<PAGE>

PART C.  OTHER INFORMATION

Item 24. FINANCIAL STATEMENTS AND EXHIBITS

         (a)  Financial Statements

         The financial statements identified with an asterisk (*) in the index
         below, together with the report of Ernst & Young LLP dated January 14,
         1997, appearing on pages 3 to 13 of the 1996 Annual Report to
         Shareholders are incorporated by reference.  With the exception of the
         preceding information, the Annual Report is not incorporated herein by
         reference and is not deemed filed as part of this Form N-1A.
 <TABLE>
<CAPTION>

                                                               Page Number In:

                                                       Prospectus     Annual Report
                                                      -------------   -------------
<S>                                                   <C>             <C>

         *Financial Highlights for each of the ten
         years in the period ended December 31,
         1996                                             3                 3

         *Statement of Assets and Liabilities at
         December 31, 1996                                                  4

         *Schedule of Investments at December 31,
         1996                                                              5-8

         *Statement of Operations for the year
         ended December 31, 1996                                            9

         *Statement of Changes in Net Assets for
         the years ended December 31, 1996 and
         1995                                                               10

         *Notes to Financial Statements                                     11

         Report of Independent Auditors                                     12

</TABLE>

 
Schedules are omitted for the reason that they are not required or are not
applicable, or the required information is shown in the financial statements or
notes thereto.

    (b)  Exhibits

         1.   Articles of Incorporation.  Incorporated by reference to
              registrant's Registration Statement on Form N-1A, No. 2-18269,
              Post-Effective Amendment No. 33, filed on April 9, 1990.

         2.   By-laws.  Incorporated by reference to registrant's Registration
              Statement on Form N-1A, No. 2-18269, Post-Effective Amendment No.
              33, filed on April 9, 1990.

         3.   None.

         4.   Articles of Incorporation, Article V.  Incorporated by reference
              to registrant's Registration Statement on Form N-1A, No. 2-18269,
              Post-Effective Amendment No. 33, filed on April 9, 1990.

<PAGE>


         5.   Investment Advisory Contract.  Incorporated by reference to
              registrant's Registration Statement on Form N-1, No. 2-18269,
              Post-Effective Amendment No. 14, filed April, 1972.

         6.   None.

         7.   None.

         8.   Custodian Agreement entered into between the Fund and Firstar
              Trust Company on April 15, 1996.  Incorporated by reference to
              registrant's Registration Statement on Form N-1A, No. 2-18269,
              Post-Effective Amendment No. 39, filed April 29, 1996.

         9.   None.

         10.  None.

         11.  Consent of Independent Auditors

         12.  Financial Statements contained in 1996 Annual Report to
              Shareholders (See Index, Item 24 (a), Part C, Other Information).

         13.  None.

         14.  Mairs and Power, Inc. Prototype Self-Employed Money Purchase and
              Pension Plan, Trust, Summary Plan Description, Adoption
              Agreements Nos. 001 and 002, and Custody Agreement.  Incorporated
              by reference to registrant's Registration Statement on Form N-1A,
              No. 2-18269, Post-Effective Amendment No. 36, filed on April 27, 
              1993.

         15.  None.

         16.  None.

         17.  Financial Data Schedule.

         18.  None.


Item 25. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT

         Inapplicable

Item 26. NUMBER OF HOLDERS OF SECURITIES

         Title of Class  (1)                   Number of Record Holders   (2)
         --------------                        ------------------------

         Capital Stock, 10,000,000 shares                384
         Par Value ten cents ($.10)              (As of March 31, 1997)

<PAGE>

Item 27. INDEMNIFICATION

         The Fund's Amended and Restated Articles of Incorporation state that a
         director of the corporation shall have no personal liability to the
         corporation or its shareholders for monetary damages for breach of
         fiduciary duty as a director to the full extent such immunity is
         permitted from time to time under the Minnesota Business Corporation
         Act, as now enacted or hereafter amended, except as prohibited by the
         Investment Company Act of 1940, as amended.

         Section 302A.521 of the Minnesota Business Corporation Act provides
         that a Minnesota corporation shall indemnify any director, officer, or
         employee of the corporation made or threatened to be made a party to a
         proceeding, by reason of the former or present official capacity of
         the person, against judgments, penalties, fines, settlements and
         reasonable expenses incurred by the person in connection with the
         proceeding, provided that certain statutory standards are met.
         "Proceeding" means a threatened, pending or completed civil, criminal,
         administrative, arbitration or investigative proceeding, including one
         by or in the right of the corporation.  Indemnification is required
         under Section 302A.521 only if the person (i) has not been indemnified
         by any other organization with respect to the same acts or omissions,
         (ii) acted in good faith, (iii) received no improper personal benefit,
         (iv) in the case of a criminal proceeding, had no reasonable cause to
         believe the conduct was unlawful, and (v) reasonably believed that the
         conduct was in the best interests of the corporation.

Item 28. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER

         Inapplicable

Item 29. PRINCIPAL UNDERWRITERS

         Inapplicable

Item 30. LOCATION OF ACCOUNTS AND RECORDS

         Custodian:               Firstar Trust Company
                                  615 East Michigan Street
                                  P.O. Box 701
                                  Milwaukee, WI  53201-0701

         Transfer Agent:          Mairs and Power, Inc.
                                  W-2062 First National Bank Bldg.
                                  332 Minnesota Street
                                  St. Paul, MN  55101-1363

         Investment Adviser:      Mairs and Power, Inc.
                                  W-2062 First National Bank Bldg.
                                  332 Minnesota Street
                                  St. Paul, MN  55101-1363

<PAGE>

Item 31. MANAGEMENT SERVICES

         Inapplicable

Item 32. UNDERTAKINGS

         Inapplicable

<PAGE>

                                      SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment
Company Act of 1940, the Registrant certifies that it meets all of the
requirements for effectiveness of the Registration Statement pursuant to Rule
485 (b) under the Securities Act of 1933 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of St. Paul, and State of Minnesota on the 30th day of
April 1997.

                        MAIRS AND POWER INCOME FUND, INC.

                           /s/ William B. Frels
                        ----------------------------------------------------
                        William B. Frels, President

    Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed below by the following persons in the
capacities and on the dates indicated.


/s/ William B. Frels
- --------------------       President and Director             April 30, 1997
William B. Frels           (Principal Executive Officer)


/s/ George A. Mairs, III
- --------------------       Secretary and Director             April 30, 1997
George A. Mairs, III       (Principal Financial and
                           Accounting Officer)

/s/ Peter G. Robb
- --------------------       Vice-President and Director        April 30, 1997
Peter G. Robb

/s/ Litton E.S. Field
- --------------------       Director                           April 30, 1997
Litton E.S. Field

/s/ Donald E. Garretson
- --------------------       Director                           April 30, 1997
Donald E. Garretson

/s/ J. Thomas Simonet
- --------------------       Director                           April 30, 1997
J. Thomas Simonet

<PAGE>

                                    EXHIBIT INDEX


Item          Description
- ----          -----------

1-10          Not filed herewith.

11            Consent of Independent Auditors.

12            Financial Statements contained in 1996 Annual Report to 
              Shareholders (See Index Under Item 24 (a) in Part C).

13-16         Not filed herewith.

17            Financial Data Schedule.

18            Not filed herewith.


<PAGE>
                                                                      Exhibit 11


                           Consent of Independent Auditors


We consent to the reference to our firm under the captions "Condensed Financial
Information" and "Financial Statements" in Amendment No. 41 to the Registration
Statement (Form N-1A, No. 2-18269) and related Prospectus of Mairs and Power
Income Fund, Inc. and to the incorporation by reference therein of our report
dated January 14, 1997, with respect to the financial statements and financial
highlights of Mairs and Power Income Fund, Inc. included in its Annual Report
for the year ended December 31, 1996, filed with the Securities and Exchange
Commission.

                                               ERNST & YOUNG LLP

Minneapolis, Minnesota
April 28, 1997


<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ANNUAL
REPORT DATED DECEMBER 31, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATMENTS.
</LEGEND>
<CIK> 0000061630
<NAME> MAIRS & POWER INCOME FUND, INC.
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                         11959192
<INVESTMENTS-AT-VALUE>                        20019473
<RECEIVABLES>                                   123196
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                            432996
<TOTAL-ASSETS>                                20575665
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        10651
<TOTAL-LIABILITIES>                              10651
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      12417826
<SHARES-COMMON-STOCK>                           279117
<SHARES-COMMON-PRIOR>                           259636
<ACCUMULATED-NII-CURRENT>                        70526
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        (11531)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       8060281
<NET-ASSETS>                                  20565014
<DIVIDEND-INCOME>                               417047
<INTEREST-INCOME>                               378837
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (203079)
<NET-INVESTMENT-INCOME>                         592805
<REALIZED-GAINS-CURRENT>                        298179
<APPREC-INCREASE-CURRENT>                      2237463
<NET-CHANGE-FROM-OPS>                          3128447
<EQUALIZATION>                                    2499
<DISTRIBUTIONS-OF-INCOME>                     (592863)
<DISTRIBUTIONS-OF-GAINS>                      (299429)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          36141
<NUMBER-OF-SHARES-REDEEMED>                    (26306)
<SHARES-REINVESTED>                               9645
<NET-CHANGE-IN-ASSETS>                         3586261
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                        (47432)
<OVERDIST-NET-GAINS-PRIOR>                     (10369)
<GROSS-ADVISORY-FEES>                           113288
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 203079
<AVERAGE-NET-ASSETS>                          18744799
<PER-SHARE-NAV-BEGIN>                            65.39
<PER-SHARE-NII>                                   2.19
<PER-SHARE-GAIN-APPREC>                           9.38
<PER-SHARE-DIVIDEND>                            (2.20)
<PER-SHARE-DISTRIBUTIONS>                       (1.08)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              73.68
<EXPENSE-RATIO>                                   1.08
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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