SOUTHERN MICHIGAN BANCORP INC
S-3D, 1998-04-30
STATE COMMERCIAL BANKS
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<PAGE>   1
                                            Registration No. 333-
                                                                 ---------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                     -------------------------------------

                                    FORM S-3
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                     -------------------------------------
                        SOUTHERN MICHIGAN BANCORP, INC.
             (Exact name of registrant as specified in its charter)

        MICHIGAN                                    38-2407501
(State or other jurisdiction             (I.R.S. Employer Identification Number)
of incorporation or organization)

                              51 WEST PEARL STREET
                           COLDWATER, MICHIGAN 49036
                                 (517) 279-5500
            (Addressed, including zip code, and telephone number,
                    including area code, of registrant's
                        principal executive offices)
                     -------------------------------------

JAMES T. GROHALSKI                        Copy to:                              
EXECUTIVE VICE PRESIDENT AND              Timothy E. Kraepel, Esq.              
SECRETARY/TREASURER                       Howard & Howard Attorneys, P.C.       
SOUTHERN MICHIGAN BANCORP, INC.           1400 North Woodward Avenue, Suite 101 
51 WEST PEARL STREET                      Bloomfield Hills, Michigan 48304-2856 
COLDWATER, MICHIGAN 49036                 (248) 645-1483                        
(517) 279-5500                                                                  
(Name and address, including                                                    
zip code, and telephone number,                                                 
including area code, of agent             
for service)
                     -------------------------------------
                     Approximate date of commencement of
                  proposed sale to the public: FROM TIME TO
                    TIME AFTER THE REGISTRATION STATEMENT
                             BECOMES EFFECTIVE.
                     -------------------------------------

   If only securities being registered on this form are being offered pursuant
 to dividend or interest reinvestment plans, check the following box.  [ X ]
                     -------------------------------------

   If any of the securities being registered on the Form are to be offered on a
 delayed or continuous basis pursuant to Rule 415 under the Securities Act of
 1933, other than securities offered only in connection with dividend or
 interest reinvestment plans, check the following box.  [   ]
                     -------------------------------------

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
==============================================================================================================================
   Title of Each Class                                   Proposed Maximum           Proposed Maximum            Amount of
   of Securities to be          Amount to be            Aggregate Offering         Aggregate Offering          Registration
        Registered               Registered              Price Per Share                 Price                     Fee
- - ------------------------------------------------------------------------------------------------------------------------------
   <S>                          <C>                     <C>                        <C>                         <C>
       Common Stock                70,822                    $43.125*                $3,054,198.75              $ 901
                                   Shares
==============================================================================================================================
</TABLE>



* Estimated solely for the purpose of determining the registration fee pursuant
to Rule 457(c) as the average of the closing bid and asked prices on April 27,
1998.

Pursuant to Rule 429 under the Securities Act of 1933, as amended, this
Registration Statement also constitutes Post-Effective Amendment No. 1 to the
Registrant's Registration Statement on Form S-3 (File No. 33-24977) relating
75,000 shares of the Registrant's Common Stock, and the Prospectus included
herein is a combined Prospectus which also relates to Registration No.
33-24977.  A total of 4,178 shares of the Registrant's Common Stock are being
carried forward, and a filing fee of $480 was previously paid with respect to
such shares upon filing Registration Statement No. 33-24977.

<PAGE>   2

                        SOUTHERN MICHIGAN BANCORP, INC.
                             CROSS REFERENCE SHEET
                                      for
                       Registration Statement on Form S-3


<TABLE>
<CAPTION>
 PART I                                                                          PAGE(S) IN
 ITEM NO.             ITEM                                                       PROSPECTUS
 --------             ----                                                       ----------
   <S>                <C>                                                        <C>
    1.                Forepart of Registration Statement and Outside             Facing Page, Cross         
                      Front Cover Page of Prospectus                             Reference Sheet, Outside   
                                                                                 Front Cover Page of        
                                                                                 Prospectus                 
                                                                                                            
                                                                                 
    2.                Inside Front and Outside Back Cover Pages of               2, Outside Back Cover      
                      Prospectus                                                 Page of Prospectus         
                                                                                                            
    3.                Summary Information, Risk Factors, and Ratio of            Outside Front Cover Page   
                      Earnings to Fixed Charges                                  of Prospectus              
                                                                                                            
    4.                Use of Proceeds                                            10                         
                                                                                                            
    5.                Determination of Offering Price                            5                       
                                                                                
                                                                                                            
    6.                Dilution                                                   Not Applicable             
                                                                                                            
    7.                Selling Security Holders                                   Not Applicable             
                                                                                                            
    8.                Plan of Distribution                                       5                          
                                                                                                            
    9.                Description of Securities to be Registered                 9 - 10                     
                                                                                                            
   10.                Interests of Named Experts and Counsel                     10                         
                                                                                                            
   11.                Material Changes                                           Not Applicable             
                                                                                                            
   12.                Incorporation of Certain Information by Reference          2                          
                                                                                                            
   13.                Disclosure of Commission Position on                                                  
                      Indemnification for Securities Act Liabilities             10                         
                                                                                                            
</TABLE>
<PAGE>   3

PROSPECTUS                                                         75,000 SHARES


                        SOUTHERN MICHIGAN BANCORP, INC.
                              51 West Pearl Street
                           Coldwater, Michigan 49036
                           Telephone:  (517) 279-7511


                          SHAREHOLDERS INVESTMENT PLAN


                                  COMMON STOCK
                               ($2.50 par value)




    This Prospectus describes the Southern Michigan Bancorp, Inc. (the 
"Company") Shareholders Investment Plan (the "Plan") under which shares of
Southern Michigan Bancorp, Inc. Common Stock ("Common Stock") will be purchased
by the Plan for participants from the Company with automatically reinvested
dividends and with optional cash payments.  Holders of Common Stock are eligible
for participation in the Plan.
        
    This Prospectus sets forth the terms of the Plan as amended and relates to
authorized and unissued shares of Common Stock registered for issuance under
the Plan.  IT IS SUGGESTED THAT THIS PROSPECTUS 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.

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




                 The date of this Prospectus is April 30, 1998.
<PAGE>   4

                             AVAILABLE INFORMATION

    The Company is subject to the informational requirements of the Securities
Exchange Act of 1934 and, in accordance therewith, files reports and other
information with the Securities and Exchange Commission.  These reports and
other information filed can be inspected and copied at the public reference
facilities of the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549,
and at the Commission's Regional Offices located at 7 World Trade Center, New
York, New York 10048; 1401 Brickell Avenue, Suite 200, Miami, Florida  33131;
500 W. Madison Street, Suite 1400, Chicago, Illinois 60661-2511; 1801
California Street, Suite 4800, Denver, Colorado  80202-2648; and 5670 Wilshire
Boulevard, 11th Floor, Los Angeles, California  90036-3648.  Copies may be
obtained from the Public Reference Section of the Commission, Washington, D.C.
20549, at prescribed rates.  The Commission also maintains a Web site
(http:\\www.sec.gov) that contains reports and other information regarding the
Company.

                      DOCUMENTS INCORPORATED BY REFERENCE

    The following documents filed by the Company with the Securities and 
Exchange Commission are incorporated herein by reference:
        
       (a) the Company's Annual Report on Form 10-K filed with the Securities 
    and Exchange Commission for the year ended December 31, 1997.

       (b) All documents subsequently filed by the Company after the date of 
    this Prospectus pursuant to Section 13, 14 or 15(d) of the Securities
    Exchange Act of 1934 prior to the termination of this offering shall be
    deemed to be incorporated by reference in this Prospectus and to be a part
    hereof from the date of filing of such documents.  Any statement contained
    herein or in a document incorporated or deemed to be incorporated by
    reference herein shall be modified or superseded for purposes of this
    Prospectus to the extent that a statement contained herein or in any
    subsequently filed document which is or is deemed to be incorporated by
    reference herein modifies or supersedes such statement.  Any such statement
    so modified or superseded shall not, except as so modified or superseded,
    constitute a part of this Prospectus.
        
    Any person to whom a copy of this Prospectus is delivered, including any
beneficial owner, may obtain without charge, upon written or oral request, a
copy of any of the documents incorporated by reference herein (not including
exhibits to the documents incorporated by reference unless such exhibits are
specifically incorporated by reference into the documents this Prospectus
incorporates by reference).  Requests should be made to Southern Michigan
Bancorp, Inc. (Attention:  Secretary), 51 West Pearl Street, Coldwater,
Michigan 49036, (517) 279-7511.





                                       2
<PAGE>   5

                                  THE COMPANY

    The Company is a Michigan business corporation and a one-bank holding 
company registered under the federal Bank Holding Company Act with its corporate
headquarters in Coldwater, Michigan.  Its principal activity is owning and
operating its wholly-owned subsidiary, Southern Michigan Bank & Trust (the
"Bank"), a national bank engaged in the business of commercial banking.

        
    This Prospectus relates to newly issuable Common Stock offered by the 
Company pursuant to the Plan.
        
                                    THE PLAN

     Following is a statement of the Plan in numbered question and answer form.

     PURPOSE

     1.   What is the purpose of the Plan?

     The Plan offers holders of Common Stock a systematic method of investing 
their cash dividends or optional cash payments (not to exceed $5,000 in any
calendar quarter; $25 minimum payment) in Common Stock without payment of any
brokerage commission, service charge, or other expense.  Because the Common
Stock will usually be purchased from the Company, the Plan will also provide the
Company with a means of raising new capital.
        
     2.   What are some of the advantages of the Plan?

     A participant in the Plan who authorizes reinvestment of dividends will 
have cash dividends on all shares of Common Stock held in his or her name and in
the Plan automatically reinvested in shares of Common Stock at the then current
market price (see Question 10).  Each participant may invest up to an additional
$5,000 each calendar quarter (minimum payment of $25) in Common Stock at the
then current market price without the payment of any brokerage commission,
service charge or other expense.  Full investment of funds is possible under the
Plan because the Plan permits fractions of shares, as well as full shares, to be
credited to the participant's account.  Dividends with respect to fractions of
shares, as well as full shares, will be credited to the participant's account. 
The need for the participant's safekeeping of certificates is avoided and
regular statements of accounts provide simplified record keeping.
        
        



                                       3
<PAGE>   6

     ADMINISTRATION
     
     3.   Who administers the Plan for participants?

     The Bank acts as Plan Administrator for participants and arranges for the
custody of stock certificates, keeps records, sends statements of accounts to
participants, and performs other duties relating to the Plan.

     WITHHOLDING OF TAX

     4.   Will any tax be withheld on dividends ?

     There will be no withholding from dividends for most participants who are
not foreign participants.  However, the Internal Revenue Service may direct the
Company to withhold 20 percent of any dividend or interest payment to specified
participants who under-report dividend income.  In such a case, the amount
withheld will not be reinvested under the Plan.
        
     PARTICIPATION

     5.   Who is eligible to participate?

     A person must be a holder of record of Common Stock to be eligible to
participate in the Plan.

     6.   How does an eligible shareholder participate?

     A holder of record of Common Stock may join the Plan by completing and 
signing an appropriate Authorization Card in accordance with the instructions
and returning it to the Bank.
        
     Any participant may, by so indicating on an Authorization Card, authorize
reinvestment of all dividends on Common Stock registered in his or her name and
of dividends on Common Stock held in his or her account in the Plan.  Any
participant may make optional cash payments into the Plan which will be
invested in Common Stock.  Authorization Cards may be obtained at any time by
written request to the Bank at 51 West Pearl Street, Coldwater, Michigan 49036;
Attention:  Shareholders Investment Plan.  A new Authorization Card need be
submitted only with respect to the first dividend on Common Stock to be
reinvested or the first optional payment.

     7.   When may a shareholder join the Plan?

     A shareholder may join the Plan at any time.  If the Authorization Card
authorizing dividend reinvestment is received by the Bank on or before the
dividend record date, the dividend (net of any withholding) will be used to
purchase newly issuable shares of Common Stock for the participant.  If the
Authorization Card is received by the Bank after the record





                                       4
<PAGE>   7

date, that dividend will be paid in cash and participation in the Plan will
commence with the following dividend.  The dividend record date is ordinarily
approximately three weeks before the payment date.

     8.   What does the Authorization Card provide?

     The Authorization Card enrolls the participant in the Plan and, if
reinvestment is authorized by checking the box, it directs the Bank to collect
all dividends on Common Stock registered in the participant's own name.  If
reinvestment of dividends is authorized, it also authorizes reinvestment of
dividends on the shares held in the Plan for the participant.  The
Authorization Card provides for the investment of any optional cash payments
made by the participant.

     The Authorization Card also appoints the Bank as agent for the 
participant and directs the Bank to purchase directly or through its agent
shares of Common Stock with the payments into the Plan.
        
     COSTS

     9.   Are there any out-of-pocket expenses to a shareholder who 
          participates in the Plan?

     No.  There are no brokerage commissions if shares are purchased from the
Company.  Brokerage costs, if any, on shares purchased other than from the
Company will be borne by the Company.  If, however, a participating shareholder
instructs the Bank to sell his or her shares, the brokerage fees and any
transfer taxes on such sale will be borne by the participant.

     PURCHASES

     10.  What will be the price of Common Stock purchased under the Plan?

     The price of shares of Common Stock purchased from the Company will be the
average of the closing bid and asked prices for such shares on the payment
date, or, in the case of shares purchased with optional cash payments, on such
date as the shares are purchased (see Question 14).

     Under no circumstances, however, will Common Stock be sold by the Company
at less than its par value, which is currently $2.50 per share.  The Company
will bear the entire cost of brokerage commissions.  The price of shares
purchased from a source other than the Company will be the average price of all
shares purchased with the aggregate of any dividends or the optional cash
payments for one month.
        




                                       5
<PAGE>   8

     11.  How many shares of Common Stock will be purchased for a participant?

     The number of shares to be purchased depends on the amount of the
participant's dividend, the amount, if any, required by law to be withheld, if
any, the optional cash payments, and the average of the closing bid and asked
prices of the Common Stock on the payment date or the date of purchase for
shares purchased with optional cash payments.  When shares are purchased on the
open market, the number of shares will depend on the average actual purchase
price.  Each participant's account will be credited with that number of shares,
including fractions computed to four decimal places, equal to the amount of the
dividends, net of withholding, or the amount of his or her optional cash
payment, each divided by the applicable purchase price.

     OPTIONAL CASH PAYMENTS

     12.  How does the optional cash payment work?

     The Plan permits participants to make optional cash payments from $25 to
$5,000 each calendar quarter.  Any optional cash payment received from a
participant, subject to the minimum payment and the quarterly maximum, will be
applied to purchase additional shares.  Dividends on shares purchased with
optional cash payments will be automatically reinvested in shares of Common
Stock if reinvestment of dividends is authorized.

     13.  How are optional cash payments made?

     After receiving a statement from the Bank confirming the first investment
under the Plan, a participant may send to the Bank optional cash payments for
the purchase of additional shares of Common Stock.  Optional cash payments,
which are in addition to any dividend reinvested, must be in an amount of at
least $25 and may not exceed a total of $5,000 in any calendar quarter.

     An optional cash payment may be made by a participant by sending a check
payable to Southern Michigan Bank & Trust, 51 West Pearl Street, Coldwater,
Michigan 49046; Attention:  Shareholders Investment Plan.

     The optional cash payment feature is designed to meet the participant's
particular cash situations at any given time.  A participant is not obligated
to make optional cash payments or to continue to do so each succeeding quarter.
The amount of optional cash payments may also vary, subject to the minimum
payment of $25 and the calendar quarterly maximum of $5,000.

     14.  When should optional cash payments be sent to the Bank?

     Optional cash payments may be made by a participant at any time, subject to
the minimum payment of $25 and the calendar quarterly maximum of $5,000.
Optional cash payments received by the Bank by the 25th day of the month will
be used by the Bank to purchase shares on behalf of the participant on the
first day of the following month.  (In the





                                       6
<PAGE>   9

event that the first day of the month is a Saturday, Sunday, or holiday, shares
will be purchased on the next succeeding business day.) Optional cash payments
received after the 25th day of the month will be held by the Bank, without
interest, until the next purchase date.

    OPTIONAL CASH PAYMENTS MUST BE RECEIVED BY THE 25TH DAY OF THE MONTH FOR
SHARES TO BE PURCHASED ON THE FIRST BUSINESS DAY OF THE FOLLOWING MONTH.

    REPORTS

    15.  What kind of reports will be sent to a participant in the Plan?

    A participant in the Plan will receive a statement of his or her account
following each reinvestment of dividends and each investment of an optional
cash payment.  These statements are the participant's continuing record of the
cost of his or her purchases and should be retained for income tax purposes.
All notices will be addressed to the participant at his or her last address of
record with the Bank and will satisfy all duties to give notice to any
participant.  A participant should promptly notify the Bank of any change of
address.  As a shareholder of the Company, a participant will continue to
receive copies of reports and other materials sent to shareholders (see
"Reports to Shareholders").

    DIVIDENDS

    16.  Will a participant be credited with dividends on fractional shares?

    Yes.  If a dividend or an optional cash payment is, after any withholding,
not large enough to purchase a full share, the participant will be credited with
a fractional share computed to four decimal points.  Fractional shares will be
entitled to dividends in the same manner as full shares.
        
    CERTIFICATES

    17.  Will certificates be issued to participants for Common Stock purchased?

    Normally, certificates for shares of Common Stock purchased under the Plan,
whether through the reinvestment of dividends or optional cash payments, will
be issued to and registered in the name of Southern Michigan Bank & Trust, or
its designee, as agent for the participants in the Plan.  The number of shares
credited to an account under the Plan will be shown on the participant's
statement of account.

    Shares credited to the account of a participant under the Plan may not be
pledged.  A participant who wishes to pledge his or her shares must request
that certificates for the shares be issued in the participant's name.





                                       7
<PAGE>   10

    Upon the written request of a participant, a certificate for the number of
whole shares credited to the participant's account will be issued to,
registered in the name of, and delivered to the participant.  This request
should be mailed to Southern Michigan Bank & Trust, 51 West Pearl Street,
Coldwater, Michigan 49036; Attention:  Shareholders Investment Plan.  Any
remaining full shares and fractions of a share will continue to be credited to
the participant's account.

    A certificate for fractions of a share will not be issued to a participant
under any circumstances.

    WITHDRAWAL

    18.  How does a participant withdraw from the Plan?

    A participant must notify the Bank in writing in order to withdraw from the
Plan.  Upon withdrawal from the Plan or upon termination of the Plan by the
Company, a certificate for whole shares credited to the participant's account
under the Plan will be delivered to the participant and cash payment will be
made for any fractional shares.  Cash payments for fractional shares under the
Plan will be calculated based on the average of the closing bid and asked
prices on the date a written withdrawal request is received by the Bank.  Upon
withdrawal from the Plan, a participant may request that all shares, both whole
and fractional, credited to his or her account in the Plan, be sold for the
participant's account on the open market.  Any such request must be signed by
the participant with his or her signature guaranteed by a bank.  A participant
will receive the proceeds of the sale, less any brokerage commissions and
transfer taxes payable.  Cash payments for fractional shares will be paid by
the Bank based on the selling price of such whole shares.

    19.  When may a participant withdraw from the Plan?

    A participant may withdraw from the Plan at any time.

    A participant may stop the reinvestment of dividends without withdrawing 
from the Plan by written instructions which will be effective as to all
dividends for which the record date falls after the instructions are received by
the Bank.  (The record date for a dividend ordinarily is approximately three
weeks before the payment date.)  If the instructions are received after the
record date, the payment of dividends will be reinvested.
        
    OTHER INFORMATION

    20.  What happens when a participant sells or transfers all of the shares
registered in his or her name?

    If a participant disposes of all securities registered in his or her name,
the Bank will continue to reinvest the dividends on the shares credited to his
or her account under the Plan,
        




                                       8
<PAGE>   11

if he or she has authorized reinvestment of dividends, until otherwise notified
in writing.  If a participant then holds less than one full share in the Plan,
payment for the fractional share will be made by the Bank based on the average
closing bid and asked prices on date notice is received, and the net proceeds
mailed directly to the participant.

    21.  When may a shareholder rejoin the Plan?

    A participant who withdraws from the Plan may again become a participant at
any time as long as he or she is then an eligible shareholder (see Questions 5
and 6).

    22.  What happens if the Company issues a stock dividend, declares a stock
split, or has a rights offering?

    Any Common Stock distributed by the Company in the event of a stock dividend
or split will be credited to participants' Plan accounts.  If the Company
should have a rights offering on Common Stock, a shareholder's entitlement will
be based upon total stock holdings of Common Stock, which will include both the
shares registered in his or her name and the shares (including fractional
shares) credited to his or her Plan account.  In the event of a rights
offering, the purchasing agent will sell rights on the open market and
proportionately credit each participant's account with the net proceeds of the
sale, which then will be invested in additional shares as optional cash
payments.  If the Company is required by law to withhold any portion of such a
distribution and pay it over to any government, it will do so as required by
law and credit the balance to participants' accounts for investment in
additional Common Stock as optional cash payments.

    23.  How will a participant's shares be voted at meetings of shareholders?

    Any shares held in the Plan for participant will be voted as the participant
directs.  For each meeting of shareholders, a participant will receive proxy
cards which will enable the participant to vote all the shares entitled to vote
either registered in the participant's name or held for the participant's
account under the Plan, including fractional shares calculated to four decimal
places.

    24.  What is the responsibility of the Bank and its agent under the Plan?

    The Bank, in administering the Plan, will not be liable for any act 
performed in good faith or for any good faith omission to act, including,
without limitation, any claim of liability (a) arising out of failure to
terminate a participant's account upon such participant's death before the
Bank's actual receipt of a notice in writing of such death from a person
authorized to give such notice, and (b) with respect to the prices at which
shares of Common Stock are purchased or sold for a participant's account and the
times when such purchases or sales are made.
        
    All transactions in connection with the Plan, including the optional cash
payments, shall be governed by the laws of the State of Michigan.





                                       9
<PAGE>   12
    25.  May the Plan be changed or discontinued?

    The Company reserves the right to suspend, modify, or terminate the Plan at
any time.  Notice will be sent to all participants at their last known
addresses of any such suspension, modification, or termination.

                                THE COMMON STOCK

    The Common Stock offered pursuant to the Plan and this offering has a 
current par value of $2.50 per share.  As of March 31, 1998, there were
4,000,000 shares of authorized Common Stock, 1,921,513 shares of which were
issued and outstanding.
        
    Holders of Common Stock are entitled to dividends when, as and if declared
by the Company's Board of Directors out of funds legally available therefor.
Funds for the payment of cash dividends are expected to be obtained primarily
from cash dividends paid on the Common Stock of the Bank held by the Company.
Exclusive voting rights are vested in holders of Common Stock, each share being
entitled to one vote.  Holders of Common Stock do not have cumulative voting
rights in electing directors.  Holders of Common Stock have no preemptive rights
to subscribe to any additional shares of Common Stock that the Company may
issue.  Upon liquidation, holders of Common Stock are entitled to receive pro
rata any assets distributable to shareholder after providing for the payment of
creditors.
        
    When issued, the Common Stock issuable under the Plan will be fully paid and
non-assessable.

    Article IX of the Company's Articles of Incorporation provides under certain
circumstances that, unless a majority of the Board of Directors approves the
transaction, the affirmative vote of holders of two-thirds of the outstanding
shares of the company entitled to vote will be necessary to approve any merger,
consolidation or dissolution, or the sale, lease, transfer, exchange, mortgage,
or pledge of all or substantially all of the assets of the Company.  The
circumstances under which the two-thirds vote is required are those in which
the person with which the Company will merge, consolidate, or exchange assets,
or to which the Company will sell, lease, transfer, mortgage, or pledge assets,
is or has recently been the beneficial owners of five percent or more of the
voting stock of the Company.

    Article XII to the Articles of Incorporation requires the affirmative vote
of the holders of not less than two-thirds (2/3) of the voting stock in order
to alter, amend, repeal, or adopt any new provision of the Articles of
Incorporation to permit action to be taken by shareholders by less than
unanimous written consent.  In addition, Article XII of the Articles of
Incorporation requires the same two-thirds (2/3) supermajority in order to
amend Article XII or the provision in the Articles of Incorporation discussed
in the previous paragraph.  Finally, Article XII requires a two-thirds (2/3)
supermajority vote or the affirmative vote of Directors constituting not less
than 80% of the Directors then in office to alter, amend, repeal, or adopt any
provision inconsistent with Bylaw provisions Article XII Section 2 (governing
special meetings) or Section 4 (governing notice and shareholder proposals) or
Article III, Section 2 (governing size of board), Section 3 (governing 
procedures for nominating directors), Section 6 (governing special meetings of
the Board of Directors), or Section 11 (governing the manner of filling
director vacancies) or Article XII (governing redemption of "Control Shares")
or Article XIII (governing the manner of amending the Bylaws).

                                USE OF PROCEEDS

    The Company cannot estimate either the number of shares of Common Stock that
will ultimately be sold pursuant to the Plan or the prices at which such shares
will be sold.  The proceeds from any such sale will be added to the working
capital of the Company and will be available for general corporate purposes.





                                       10
<PAGE>   13

                            REPORTS TO SHAREHOLDERS

    Shareholders of the Company receive Annual Reports containing audited
financial statements opined upon by independent certified public accountants.
Shareholders also receive quarterly reports containing unaudited interim
financial statements and other information.

                   INDEMNIFICATION OF DIRECTORS AND OFFICERS

    The Michigan Business Corporation Act and provisions of the Company's 
Articles of Incorporation and By-Laws provide for indemnification of the
Company's directors and officers in a variety of circumstances against
liabilities arising in connection with the performance of their duties.  The
Company maintains insurance against such liabilities on behalf of its directors
and officers.  Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors or officers of the Company
pursuant to the foregoing provisions, the Company has been informed that, in the
opinion of the Securities and Exchange Commission, such indemnification is
against public policy as expressed in the Act and is therefore unenforceable.
        
                                 LEGAL MATTERS

    Legal matters in connection with the issuance of the Common Stock under the
Plan will be passed upon by the firm of Howard & Howard Attorneys, P.C.,
Bloomfield Hills, Michigan.

                                    EXPERTS

    The financial statements of Southern Michigan Bancorp, Inc.  incorporated by
reference in this Registration Statement have been audited by Crowe, Chizek and
Company LLP, independent accountants, for the periods indicated in their report
thereon which is included in the Annual Report on Form 10-K for the year ended
December 31, 1997.  The financial statements audited by Crowe, Chizek and
Company LLP have been incorporated herein by reference in reliance upon their
report given on their authority as experts in accounting and auditing.





                                       11
<PAGE>   14

                        [back cover page of Prospectus]

                               TABLE OF CONTENTS


AVAILABLE INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . .   2
                                                    
DOCUMENTS INCORPORATED BY REFERENCE . . . . . . . . . . . . . . . . . .   2
                                                    
THE COMPANY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                                                    
THE PLAN  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     Purpose  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3 
     Administration   . . . . . . . . . . . . . . . . . . . . . . . . .   4 
     Withholding of Tax   . . . . . . . . . . . . . . . . . . . . . . .   4 
     Participation  . . . . . . . . . . . . . . . . . . . . . . . . . .   4 
     Costs  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5 
     Purchases  . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5 
     Optional Cash Payments   . . . . . . . . . . . . . . . . . . . . .   6 
     Reports  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7 
     Dividends  . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7 
     Certificates   . . . . . . . . . . . . . . . . . . . . . . . . . .   7 
     Withdrawal   . . . . . . . . . . . . . . . . . . . . . . . . . . .   8 
     Other Information  . . . . . . . . . . . . . . . . . . . . . . . .   8 
                                                          
THE COMMON STOCK  . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                                                    
USE OF PROCEEDS . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                                                    
REPORTS TO SHAREHOLDERS . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                    
INDEMNIFICATION OF DIRECTORS AND OFFICERS . . . . . . . . . . . . . . .  11
                                                    
LEGAL MATTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                    
EXPERTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11


NO PERSON IS AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY REPRESENTATIONS
NOT CONTAINED IN THIS PROSPECTUS IN CONNECTION WITH THE OFFER CONTAINED HEREIN,
AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED
UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY.  THIS PROSPECTUS DOES NOT
CONSTITUTE AN OFFER OF ANY SECURITIES OTHER THAN THOSE TO WHICH IT RELATES OR
AN OFFER OF THOSE TO WHICH IT RELATES IN ANY JURISDICTION TO ANY PERSON TO WHOM
IT IS UNLAWFUL TO MAKE SUCH OFFER.  THE DELIVERY OF THIS PROSPECTUS AT ANY TIME
DOES NOT IMPLY THAT THE INFORMATION HEREIN IS CORRECT AS OF ANY TIME AFTER ITS
DATE.
<PAGE>   15

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS


    ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

    The following is an itemized statement of expenses in connection with the
issuance and distribution of the securities to be registered.

    Registration Fee                         901
    Printing                                  -0-
    Legal                                 $3,000*
    Accounting                            $2,000*

*Estimated

    ITEM 15.  INDEMNIFICATION OF OFFICERS AND DIRECTORS

    Sections 551 through 569 of the Michigan Business Corporation Act (the 
"Act"), Article VIII of the Registrant's Articles of Incorporation, and Article
V of the Registrant's By-Laws relate to indemnification of the Registrant's
directors and officers, among others, in a variety of circumstances against
liabilities arising in connection with the performance of their duties.
Registrant's Articles of Incorporation permit indemnification to the maximum
extent provided by Michigan law.
        
    The Act provides for indemnification of directors and officers acting in 
good faith and in a manner they reasonably believe to be in or not opposed to
the best interests of the Registrant (and, if a criminal proceeding, who have no
reasonable cause to believe their conduct to be unlawful) against (i) expenses,
judgments, fines, and settlements reasonably incurred in connection with any
threatened, pending, or completed action, suit, or proceeding arising out of a
position with, the Registrant (or with some other entity at the Registrant's
request), and (ii) expenses actually and reasonably incurred in defending
against or settling, a threatened, pending, or completed action or suit by or in
the right of the Registrant, unless the director or officer is found liable for
negligence or misconduct in his or her corporate duties and an appropriate court
does not determine that he or she is nevertheless fully and reasonably entitled
to indemnity.
        
    The Act requires indemnification for expenses to the extent that a 
director or officer is successful in defending against any such action, suit, or
proceeding, and otherwise requires in general that indemnification provided for
in (i) and (ii) above be made only on a determination by the Board of Directors,
independent legal counsel, or the shareholders that the applicable standards
have been met.  The Act further permits advances to cover such expenses before a
final determination that indemnification is permissible upon receipt of an
undertaking by or on
        




                                     II - 1
<PAGE>   16

behalf of the directors or officers to repay such amounts unless it shall
ultimately be determined that they are entitled to indemnification.

    Indemnification under the Act is not exclusive of other rights to
indemnification to which a person may be entitled under the articles of
incorporation, by-laws, or a contractual agreement.

    The Act permits the Registrant to purchase insurance on behalf of its
directors and officers against liabilities arising out of their positions with
the Registrant, whether or not such liabilities would be within the foregoing
indemnification provisions.  Pursuant to this authority, the Registrant
maintains such insurance on behalf of its directors and officers.

    ITEM 16.  EXHIBITS

    The Exhibits filed pursuant to this Item 16 immediately follow the Exhibit
Index.  The following is a description of the applicable Exhibits required for
Form S-3 by Item 601 of Regulation S-K.

<TABLE>
<CAPTION>
   EXHIBIT NUMBER                            DESCRIPTION
   --------------                            -----------
        <S>                    <C>
        (1)                    Not applicable.
   
        (2)                    Not applicable.
   
        (3)                    (I)   Certificate of Amendment to the Articles of Incorporation as filed with 
                               the Michigan Department of Consumer and Industry Services on April 21, 1998 
                               is attached hereto as Exhibit 3.
   
                               (II)  Incorporated by reference to Exhibit 3 to the Registrant's Annual
                               Report on Form 10-K for the year ended December 31, 1997 (File No. 2-78178).
   
        (4)                    Not applicable.
   
        (5)                    Opinion of Howard & Howard Attorneys, P.C. regarding legality.
   
        (8)                    Not applicable.
   
       (12)                    Not applicable.
            
       (15)                    Not applicable.
            
       (23)                    (I)    Consent of Crowe, Chizek and Company LLP
            
</TABLE>






                                    II - 2
<PAGE>   17


<TABLE>
        <S>                    <C>

                               (II)  Consent of Howard & Howard Attorneys, P.C. (contained in the firm's
                               Opinion regarding legality included herein as Exhibit (5)).

   
        (24)                   Not applicable.
   
        (25)                   Not applicable.
   
        (26)                   Not applicable.
   
        (27)                   Not applicable.

</TABLE>

    ITEM 17.  UNDERTAKINGS

    (a)  The undersigned registrant hereby undertakes as follows:

         (1) to file, during any period in which offers or sales are being 
    made, a post-effective amendment to this registration statement:

             (i)   to include any prospectus required by Section 10(a)(3) of 
         the Securities Act of 1933;

             (ii)  to reflect in the prospectus any facts or events arising 
         after the effective date of the registration statement (or the
         most recent post-effective amendment thereof) which, individually or in
         the aggregate, represent a fundamental change in the information set
         forth in the registration statement;
        
           (iii)  to include any material information with respect to the plan 
         of distribution not previously disclosed in the registration statement
         or any material change to such information in the Registration
         Statement.
        
           Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not 
         apply if the information required to be included in a post-effective
         amendment by those paragraphs is contained in periodic reports filed by
         the registrant pursuant to Section 13 or Section 15(d) of the
         Securities Exchange Act of 1934 that are incorporated by reference in
         the registration statement.
        
         (2) that, for the purpose of determining any liability under the 
    Securities Act of 1933, each such post-effective amendment shall be deemed
    to be a new registration statement relating to the securities offered
    therein, and the offering of such securities at the time shall be deemed to
    be the initial bona fide offering thereof.
        
         (3) to remove from registration by means of a post-effective 
    amendment any of the securities being registered which remain unsold at the
    termination of the offering.
        




                                     II - 3

<PAGE>   18


    (b)  The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 that is incorporated by reference in the
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.





                                     II - 4

<PAGE>   19

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Coldwater, state of Michigan, on April 21, 1998.

                                SOUTHERN MICHIGAN BANCORP, INC.


                                By: /s/ James T. Grohalski
                                   -------------------------------------
                                   James T. Grohalski

                                Its:  Executive Vice President and 
                                      Secretary/Treasurer


     Pursuant to the requirements of the Securities Act of 1933, this 
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated:
        
<TABLE>
<CAPTION>
              SIGNATURE                                 TITLE                             DATE
 <S>                                  <C>                                         <C>

 /s/ Jerry L. Towns                   Director, President and Chief Executive     April 21, 1998
 ----------------------------------   Officer (Principal Executive Officer)
 Jerry L. Towns

 /s/ James T. Grohalski               Director, Executive Vice President and      April 21, 1998
 ----------------------------------   Secretary/Treasurer (Principal Financial
 James T. Grohalski                   and Accounting Officer)
                                      


 /s/ James Briskey                    Director                                    April 21, 1998
 ----------------------------------                                                             
 James Briskey


 /s/ H. Kenneth Cole                  Director                                    April 21, 1998
 ----------------------------------                                                             
 H. Kenneth Cole

 /s/ William E. Galliers              Director                                    April 21, 1998
 ----------------------------------                                                             
 William E. Galliers
</TABLE>

                                    II - 5

<PAGE>   20

<TABLE>
<CAPTION>
              SIGNATURE                                 TITLE                             DATE
 <S>                                  <C>                                         <C>


/s/ Nolan E. Hooker                   Director                                    April 21, 1998 
- - -----------------------------------
Nolan E. Hooker 

/s/ Gregory J. Hull                   Director                                    April 21, 1998 
- - -----------------------------------
Gregory J. Hull 


/s/ Thomas E. Kolassa                 Director                                    April 21, 1998 
- - -----------------------------------
Thomas E. Kolassa 


/s/ James J. Morrison                 Director                                    April 21, 1998 
- - -----------------------------------
James J. Morrison 

                                      Director                                    April 21, 1998 
- - -----------------------------------
Jane L. Randall 


/s/ Freeman E. Riddle                 Director                                    April 21, 1998 
- - -----------------------------------
Freeman E. Riddle 

</TABLE>






                                     II - 6
<PAGE>   21

                                 EXHIBIT INDEX

    EXHIBIT NO.                               EXHIBIT

          3          Certificate of Amendment to the Articles of Incorporation,
                     as filed with the Michigan Department of Consumer and 
                     Industry Services on April 21, 1998.

          5          Opinion of Howard & Howard Attorneys, P.C. regarding 
                     legality

         23          Consent of Crowe, Chizek and Company LLP







                                     II - 7

<PAGE>   1
<TABLE>
<S><C>
                                                                                                                          EXHIBIT 3
- - ------------------------------------------------------------------------------------------------------------------------------------
  MICHIGAN DEPARTMENT OF CONSUMER AND INDUSTRY SERVICES - CORPORATION, SECURITIES & LAND DEVELOPMENT BUREAU
- - ------------------------------------------------------------------------------------------------------------------------------------
      Date Received                                                                 (FOR BUREAU USE ONLY)

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


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


- - ---------------------------------------------------------------------------------
Name     Timothy E. Kraepel, Esq.
         Howard & Howard Attorneys, P.C.
- - ---------------------------------------------------------------------------------
Address  The Pinehurst Office Center, Suite 101
         1400 North Woodward Avenue
- - --------------------------------------------------------------------------------- EFFECTIVE DATE:
 City                       State                     Zip
Bloomfield Hills            MI                        48304-2856
- - ---------------------------------------------------------------------------------
- - ------------------------------------------------------------------------------------------------------------------------------------

 Document will be returned to the name and address you enter above.

          CERTIFICATE OF AMENDMENT TO THE ARTICLES OF INCORPORATION
              FOR USE BY DOMESTIC PROFIT AND NONPROFIT CORPORATIONS
         (Please read information and instructions on the last page)

         Pursuant to the provisions of Act 284, Public Acts of 1972 (profit
corporations), or Act 162, Public Acts of 1982 (nonprofit corporations), the
undersigned corporation executes the following Certificate:

- - ------------------------------------------------------------------------------------------------------------------------------------
1.      The present name of the corporation is: Southern Michigan Bancorp, Inc.


2.      The identification number assigned by the Bureau is: 242-955


3.      The location of its registered office is:

        51 West Pearl                                           Coldwater                                    MICHIGAN      49036
        ------------------------------------------------------------------------------------------------------------------------
        (Street Address)                                        (City)                                           (ZIP Code)

- - ------------------------------------------------------------------------------------------------------------------------------------
- - ------------------------------------------------------------------------------------------------------------------------------------
- - ------------------------------------------------------------------------------------------------------------------------------------
4.      Article III of the Articles of Incorporation is hereby amended to read as follows:

        See Attachment A hereto.

        Article VII of the Articles of Incorporation is deleted in its entirety.

        A new Article XI is added to the Articles of Incorporation to read as set forth in Attachment B hereto.

        A new Article XII is added to the Articles of Incorporation to read as set forth in Attachment C hereto.


- - ---------------------------------------------------------------------------------------------------------------------------------->
</TABLE>


<PAGE>   2


5. (FOR AMENDMENTS ADOPTED BY UNANIMOUS CONSENT OF INCORPORATORS BEFORE THE
FIRST MEETING OF THE BOARD OF DIRECTORS OR TRUSTEES.)

The foregoing amendment to the Articles of Incorporation were duly adopted on
the   day of , 19 , in accordance with the provisions of the Act by the 
unanimous consent of the incorporator(s) before the first meeting of the Board
of Directors or Trustees.

Signed this               day of                                       , 19
           ---------------      ---------------------------------------    --


- - --------------------------------              ----------------------------------
       (Signature)                                       (Signature)


- - --------------------------------              ----------------------------------
  (Type or Print Name)                                 (Type or Print Name)


- - --------------------------------              ----------------------------------
       (Signature)                                          (Signature)


- - --------------------------------              ----------------------------------
  (Type or Print Name)                                 (Type or Print Name)




6. FOR PROFIT CORPORATIONS, AND FOR NONPROFIT CORPORATIONS WHOSE ARTICLES STATE
THE CORPORATION IS ORGANIZED ON A STOCK OR ON A MEMBERSHIP BASIS.)

The foregoing amendment to the Articles of Incorporation was duly adopted on
20th day of April, 1998, by the shareholders if a profit corporation, or by the
shareholders or members if a nonprofit corporation (check one of the following)

[X]      at a meeting.  The necessary votes were cast in favor of the amendment.

[ ]      by written consent of the shareholders or members having not less than
         the minimum number of votes required by statute in accordance with
         Section 407(1) and (2) of the Act if a nonprofit corporation, or
         Section 407(1) of the Act if a profit corporation. Written notice to
         shareholders or members who have not consented in writing has been
         given. (Note: Written consent by less than all of the shareholders or
         members is permitted only if such provision appears in the Articles of
         Incorporation.)

[ ]      by written  consent of all the  shareholders  or members  entitled to 
         vote in accordance with Section 407(3) of the Act if a nonprofit 
         corporation, or Section 407(2) of the Act if a profit corporation.


                                Signed this 20th day of April, 1998




                                By: /s/ James T.Grohalski
                                   --------------------------------------------
                                   James T. Grohalski, Executive Vice President 
                                                   and Secretary
                                          (Type or Print Name and Title)


<PAGE>   3


7. (FOR A NONPROFIT CORPORATION WHOSE ARTICLES STATE THE CORPORATION IS
ORGANIZED ON A DIRECTORSHIP BASIS.)

The foregoing amendment to the Articles of Incorporation was duly adopted on the
____ day of _______, 19__ , by the directors of a nonprofit corporation whose 
articles of incorporation state it is organized on a directorship basis (check 
one of the following)


         at a meeting.  The necessary votes were cast in favor of the amendment.
- - --
         by written consent of all directors pursuant to Section 525 of the Act.
- - --


         Signed this               day of                          , 19
                    --------------       -------------------------      -- 

                            By
                              -------------------------------------------------
                              (Signature of President, Vice-President, 
                               Chairperson or Vice-Chairperson)


                              -------------------------------------------------
                                        (Type or Print Name)


<PAGE>   4



         Name of Person or Organization             Preparer's Name and Business
         Remitting Fees:                            Telephone Number:

         Howard & Howard Attorneys, P.C.            Timothy E. Kraepel, Esq.

                                                                  (248) 723-0347


- - --------------------------------------------------------------------------------
                          INFORMATION AND INSTRUCTIONS

1.   The amendment cannot be filed until this form, or a comparable document, is
     submitted.

2.   Submit one original of this document. Upon filing, the document will be
     added to the records of the Corporation, Securities and Land Development
     Bureau. The original will be returned to the address appearing in the box
     on front as evidence of filing.

     Since this document will be maintained on optical disk media, it is 
     important that the filing be legible. Documents with poor black and white 
     contrast, or otherwise illegible, will be rejected.

3.   This document is to be used pursuant to the provisions of section 631 of
     the Act for the purpose of amending the articles of incorporation of a
     domestic profit or nonprofit corporation. Do not use this form for restated
     articles. A nonprofit corporation is one incorporated to carry out any
     lawful purpose or purposes not involving pecuniary profit or gain for its
     directors, officers, shareholders, or members.

4.   Item 2 - Enter the identification number previously assigned by the Bureau.
     If this number is unknown, leave it blank.

5.   Item 4 - The article(s) being amended must be set forth in its entirety.
     However, if the article being amended is divided 5. into separately
     identifiable sections, only the sections being amended need be included.

6.   This document is effective on the date endorsed "filed" by the Bureau. A
     later effective date, no more than 90 days after 6. the date of delivery,
     may be stated as an additional article.

7.   If the amendment is adopted before the first meeting of the board of
     directors, Item 5 must be completed and signed in ink 7. by at least a
     majority of the incorporators listed in Article V of the Articles of
     Incorporation if a profit corporation, and all the incorporators if a
     nonprofit corporation. If the amendment is otherwise adopted, Item 6 or 7
     must be completed and signed in ink by the president, vice-president,
     chairperson or vice-chairperson of the corporation.

8.   FEES: Make remittance payable to the State of Michigan. Include corporation
     name and identification number on check or money order.

<TABLE>
<CAPTION>
<S>                                                                                                      <C>             <C>
     NON-REFUNDABLE FEE ........................................................................                           $10.00
     TOTAL MINIMUM FEE .........................................................................                           $10.00
     ADDITIONAL FEES DUE FOR INCREASED AUTHORIZED SHARES OF PROFIT CORPORATIONS ARE:
     each additional 20,000 authorized shares or portion thereof ...............................               $30.00       
     maximum fee for first 10,000,000 authorized shares ........................................            $5,000.00       
     each additional 20,000 authorized shares or portion thereof in excess of 10,000,000 shares                $30.00       
     maximum fee per filing for authorized shares in excess of 10,000,000 shares                          $200,000.00       


9.   Mail form and fee to: The office is located at:

     Michigan Department of Consumer & Industry Services    6546 Mercantile Way
     Corporation, Securities & Land Development Bureau      Lansing, MI  48910
     Corporation Division
     P.O. Box 30054                                         Telephone: (517) 334-6302
     Lansing, Michigan  48909-7554
</TABLE>
- - --------------------------------------------------------------------------------


<PAGE>   5

                                 ATTACHMENT A TO
                           CERTIFICATE OF AMENDMENT TO
                          THE ARTICLES OF INCORPORATION
                                       FOR
                         SOUTHERN MICHIGAN BANCORP, INC.
                                 CID NO. 242-955


                                   ARTICLE III

                  The total authorized capital stock is: 4,100,000 shares

1.       Common shares:    4,000,000, common par value $2.50 per share

         Preferred shares: 100,000

2.       A statement of all or any of the relative rights, preferences and 
         limitations of the shares of each class is as follows:

         A.       Each share of common stock shall have equal voting rights, 
preferences and privileges.

         B. The Board of Directors is authorized, subject to limitations
prescribed by law and the provisions of this Article III to divide and issue the
shares of Preferred Stock in series, and by filing a certificate containing the
resolution of the Board pursuant to the applicable law of the State of Michigan,
to establish from time to time the number of shares to be included in each
series, and to prescribe the designation, powers, relative preferences and
rights of the shares of each series and the qualifications, limitations or
restrictions thereof.

         The authority of the Board with respect to each series shall include,
but not be limited to, determination of the following:

                  (a) the number of shares constituting that series and the
         distinctive designation of that series;

                  (b) the dividend rate on the shares of that series, whether
         dividends shall be cumulative, and, if so, from which date or dates,
         and the relative rights of priority, if any, of payment of dividends on
         shares of that series;

                  (c) whether shares of that series shall have voting rights, in
         addition to the voting rights provided by law, and, if so, the terms of
         such voting rights;

                  (d) whether shares of that series shall be convertible into
         shares of any class or into shares of any series of any class at the
         option of the holder, or the Corporation, or upon the happening of a
         specified event; and, if so, the terms and conditions of such
         conversion, including provision for adjustment of the conversion rate
         in such events as the Board of Directors shall determine;

                  (e) whether or not the shares of that series shall be
         redeemable, and, if so, the terms and conditions of such redemption,
         including the date or dates upon or after which they shall be
         redeemable, and the amount per share payable in case of redemption,
         which amount may vary under different conditions and at different
         redemption dates;

                  (f) whether that series shall have a sinking fund for the
         redemption or purchase of shares of that series, and, if so, the terms
         and amounts of such sinking fund;

                  (g) the rights of the shares of that series in the event of
         voluntary or involuntary liquidation, dissolution or winding up of the
         corporation, and the relative rights of priority, if any, of payment of
         shares of that series;

                  (h) any other relative rights, preferences and limitations of
         that series as well as other variations in the relative rights and
         preferences as among different series.



<PAGE>   6


                                 ATTACHMENT B TO
                           CERTIFICATE OF AMENDMENT TO
                          THE ARTICLES OF INCORPORATION
                                       FOR
                         SOUTHERN MICHIGAN BANCORP, INC.
                                 CID NO. 242-955

                                   ARTICLE XI

         Subject to the rights of the holders of any particular class or series
of preferred stock or preference stock of this Corporation:

         A. The number of directors of this Corporation shall be fixed from time
to time by a resolution adopted by not less than 80% of the directors then in
office. The directors shall be divided into three classes, as nearly equal in
number as possible, with the term of office of the first class to expire at the
1999 Annual Meeting of shareholders, the term of office of the second class to
expire at the 2000 Annual Meeting of shareholders and the term of office of the
third class to expire at the 2001 Annual Meeting of shareholders. At each Annual
Meeting of shareholders following such initial classification and election, the
class of directors whose terms of office shall expire at such time shall be
elected to hold office for terms expiring at the third succeeding Annual Meeting
of shareholders following their election. Each director shall hold office until
his successor shall be elected and shall qualify.

         B. (i) Newly created directorships resulting from any increase in the
total number of authorized directors may be filled by the affirmative vote of
not less than 80% of the directors then in office, or by a sole remaining
director, at any regular or special meeting of the Board of Directors, or by the
shareholders in accordance with the By-Laws, and (ii) any vacancies on the Board
of Directors resulting from death, resignation, retirement, disqualification,
removal from office or other cause may be filled only by the affirmative vote of
not less than 80% of the directors then in office, or by a sole remaining
director, at any regular or special meeting of the Board of Directors. If the
number of directors is increased or decreased, any increase or decrease shall be
apportioned as nearly as possible among each class so as to maintain the number
of directors in each class as nearly equal as possible, and any additional
director of any class elected to fill any vacancy resulting from any increase in
such class shall hold office for a term which shall coincide with the remaining
term of that class. No decrease in the total number of authorized directors
constituting the Board of Directors shall shorten the term of any incumbent
director.

         C. Any director may be removed only for cause and only by the
affirmative vote of the holders of not less than a majority of the voting power
of the then outstanding shares of capital stock of the Corporation entitled to
vote generally in the election of directors, voting together as a single class,
at any regular or special meeting of the shareholders.




<PAGE>   7


                                 ATTACHMENT C TO
                           CERTIFICATE OF AMENDMENT TO
                          THE ARTICLES OF INCORPORATION
                                       FOR
                         SOUTHERN MICHIGAN BANCORP, INC.
                                 CID NO. 242-955


                                   ARTICLE XII

         Subject to the rights of the holders of any particular class or series
of preferred stock or preference stock of this Corporation:

         A. Except as provided in Article X and this Article XII of the Articles
of Incorporation, the Articles of Incorporation of this Corporation shall be
subject to alteration, amendment or repeal, and new provisions thereof may be
adopted, by the affirmative vote of the holders of not less than a majority of
the voting power of the then outstanding shares of capital stock entitled to
vote generally in the election of directors (the "Voting Stock"), voting
together as a single class. Notwithstanding the foregoing and notwithstanding
any other provisions of these Articles of Incorporation or the By-Laws of the
Corporation and in addition to any other requirements of applicable law, the
alteration, amendment or repeal of, or the adoption of any provision
inconsistent with Article X or this Article XII of the Articles of Incorporation
shall require the affirmative vote of the holders of not less than two-thirds
(2/3) of the Voting Stock, voting together as a single class.

         B. No amendment, alteration, repeal or adoption of any new provision of
the Articles of Incorporation shall be made which permits action required or
permitted to be taken by shareholders to be taken by written consent by less
than all of the holders of Voting Stock unless such amendment, alteration,
repeal or adoption of such new provision of the Articles of Incorporation shall
have been approved by the affirmative vote of the holders of not less than
two-thirds (2/3) of the Voting Stock, voting together as a single class.

         C. The By-Laws of this Corporation shall be subject to alteration,
amendment or repeal, and new By-Laws may be adopted, (i) by the affirmative vote
of the holders of not less than a majority of the Voting Stock, voting together
as a single class, or (ii) by the affirmative vote of not less than a majority
of the members of the Board of Directors then in office; provided, that any
alternation, amendment or repeal, or the adoption of any provision inconsistent
with Article II, Section 2 or Section 4, or Article III, Section 2, Section 3,
Section 6, or Section 11, or Article XII or Article XIII of the By-Laws shall
require, in the case of shareholder action, the affirmative vote of the holders
of not less than two thirds (2/3) of the Voting Stock, voting together as a
single class, or, in the case of action by the Board of Directors, the
affirmative vote of such number of directors constituting not less than 80% of
the directors then in office, or by the sole remaining director, at any regular
or special meeting of the Board of Directors.



<PAGE>   1

                                                                       EXHIBIT 5

                 [LETTERHEAD OF HOWARD & HOWARD ATTORNEYS, P.C]

                                 April 28, 1998

SOUTHERN MICHIGAN BANCORP, INC.
ATTN:  JAMES T. GROHALSKI
51 West Pearl Street
Coldwater, Michigan 49036

Gentlemen:

     We have acted as counsel to Southern Michigan Bancorp, Inc. in connection 
with the preparation and filing of a registration statement on Form S-3 (the
"Registration Statement"), under the Securities Act of 1933, covering 75,000
shares of Southern Michigan Bancorp, Inc. Common Stock ("Common Stock") offered
pursuant to the Southern Michigan Bancorp, Inc. Shareholders Investment Plan
(the "Plan").  The Plan is a dividend reinvestment plan with purchases of
authorized and unissued Common Stock for the account of participants being made
with cash dividend payments and optional cash payments made by participants. The
price of the Common Stock issuable under the Plan will be the average of the
closing bid and asked prices on the payment date, or in the case of shares
purchased with optional cash payments, on the date of purchase.
        
     We have examined originals or copies, certified or otherwise identified 
to our satisfaction, of such corporate records, certificates, and other
documents and conducted interviews with officers as we considered necessary or
appropriate for purpose of this opinion.
        
     It is our opinion that the Common Stock issuable under the Plan, when 
issued, will be legally issued, fully paid, and non-assessable.

     We consent to the use of our name under the caption "Legal Matters" in the
Prospectus which forms a part of the Registration Statement.

                                                VERY TRULY YOURS,

                                                HOWARD & HOWARD ATTORNEYS, P.C.

                                                /s/ TIMOTHY E. KRAEPEL

                                                TIMOTHY E. KRAEPEL

cc: Joseph B. Hemker


<PAGE>   1

                                                                      EXHIBIT 23

                        CONSENT OF INDEPENDENT AUDITORS


 We consent to the incorporation by reference in the Registration Statement of
 Southern Michigan Bancorp, Inc. on Form S-3, of our report dated February 2,
 1998 on the consolidated financial statements of Southern Michigan Bancorp,
 Inc., which report is included in the 1997 Annual Report on Form 10-K of
 Southern Michigan Bancorp, Inc.




                                               /s/ Crowe, Chizek and Company LLP
                                                   Crowe, Chizek and Company LLP




Grand Rapids, Michigan
April 28, 1998







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