UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-Q

(Mark One)

(517) 279-5500
(Registrant's Telephone Number, Including Area Code)

Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes       X      No       

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes ___    No ___

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act (Check one):

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).           Yes             No    X   

The number of shares outstanding of the Registrant's Common Stock, $2.50 par value, as of May 14, 2010, was 2,340,717 shares.

Forward-Looking Statements

This report contains forward-looking statements that are based on management's beliefs, assumptions, current expectations, estimates and projections about the financial services industry, the economy, and Southern Michigan Bancorp, Inc. Such statements are based upon current beliefs and expectations and involve substantial risks and uncertainties which could cause actual results to differ materially from those expressed or implied by such forward-looking statements. These statements include, among others, statements related to real estate valuation, future levels of non-performing loans, the rate of asset dispositions, dividends, future growth and funding sources, future liquidity levels, future profitability levels, the effects on earnings of changes in interest rates and the future level of other revenue sources. Management's determination of the provision and allowance for loan losses, the appropriate carrying value of intangible assets (including goodwill, mortgage servicing rights and deferred tax assets) and the fair value of investment securities (including whether any impairment on any investment security is temporary or other-than-temporary and the amount of any impairment) involves judgments that are inherently forward-looking. All of the information concerning interest rate sensitivity is forward-looking. Management's assumptions regarding pension and other post retirement plans involve judgments that are inherently forward-looking. Our ability to successfully implement new programs and initiatives, increase efficiencies, respond to declines in collateral values and credit quality, maintain our current level of deposits and other sources of funding, and improve profitability is not entirely within our control and is not assured. The future effect of changes in the real estate, financial and credit markets and the national and regional economy on the banking industry, generally, and Southern Michigan Bancorp, Inc., specifically, are also inherently uncertain. These statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions ("risk factors") that are difficult to predict with regard to timing, extent, likelihood and degree of occurrence. Therefore, actual results and outcomes may materially differ from what may be expressed or forecasted in such forward-looking statements.

Risk factors include, but are not limited to, the risk factors described in "Item 1A - Risk Factors" of our Annual Report on Form 10-K for the year ended December 31, 2009; the timing and level of asset growth; changes in market interest rates; changes in FDIC assessment rates; changes in banking laws and regulations; changes in tax laws; changes in prices, levies and assessments; the impact of technological advances and issues; governmental and regulatory policy changes; opportunities for acquisitions and the effective completion of acquisitions and integration of acquired entities; the possibility that anticipated cost savings and revenue enhancements from acquisitions, restructurings, reorganizations and bank consolidations may not be realized at amounts projected, at all or within expected time frames; the local and global effects of current and future military actions; changes in value and credit quality of investment securities; and current uncertainties and fluctuations in the financial markets and stocks of financial services providers due to concerns about credit availability and concerns about the Michigan economy in particular. These and other factors are representative of the risk factors that may emerge and could cause a difference between an ultimate actual outcome and a preceding forward-looking statement. We undertake no obligation to update or revise our forward-looking statements to reflect developments that occur or information obtained after the date of this report.

Part I.  Financial Information

See accompanying notes to interim consolidated financial statements.

See accompanying notes to interim consolidated financial statements.

See accompanying notes to interim consolidated financial statements.

See accompanying notes to interim consolidated financial statements.

SOUTHERN MICHIGAN BANCORP, INC.
NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

NOTE A - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation: The consolidated financial statements include the accounts of Southern Michigan Bancorp, Inc. (the Company) and its wholly-owned subsidiary, Southern Michigan Bank & Trust (SMB&T), after elimination of significant inter-company balances and transactions. FNB Financial was a wholly-owned subsidiary of the Company until its consolidation with and into SMB&T in April 2009. SMB&T also owns FNB Financial Services, which conducts a brokerage business and is also consolidated into SMB&T's financial statements. During 2004, the Company formed a special purpose trust, Southern Michigan Bancorp Capital Trust I, for the sole purpose of issuing trust preferred securities. Under generally accepted accounting principles in the United States of America, the trust is not consolidated into the financial statements of the Company.

The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and with the instructions for Form 10-Q and Rule 8-03 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. In the opinion of management, all adjustments considered necessary in order to make the financial statements not misleading have been included. Operating results for the three months ended March 31, 2010 are not necessarily indicative of the results that may be expected for the year ending December 31, 2010.

The accompanying consolidated financial statements should be read in conjunction with the consolidated financial statements and footnotes of the Company for December 31, 2009 included in the Company's Annual Report on Form 10-K for the year ended December 31, 2009, filed with the Securities and Exchange Commission on March 26, 2010.

Reclassifications
Some items in the prior period consolidated financial statements have been reclassified to conform to the current year presentation.

NOTE B - NEW ACCOUNTING PRONOUNCEMENTS

Adoption of New Accounting Standards: ASC 860-10 addresses accounting for transfers of financial assets. Among other requirements, the ASC removes the concept of a qualifying special-purpose entity and removes the exception from applying consolidation of variable interest entities to qualifying special-purpose entities. The objective is to improve the relevance, representational faithfulness, and comparability of the information that a reporting entity provides in its financial statements about a transfer of financial assets; the effects of a transfer on its financial position, financial performance, and cash flows; and a transferor's continuing involvement, if any, in transferred financial assets. Among other things, ASC 860-10 applies to any transfer of financial assets, which for the Company primarily relates to loan participations sold. The adoption of ASC 860-10 effective January 1, 2010 did not have any impact on the Company's March 31, 2010 consolidated financial statements since SMB&T did not sell any loan participations during the quarter.

In January 2010, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2010-06, Fair Value Measurements and Disclosures, which provides amendments to ASC 820-10 and is intended to improve disclosure requirements related fair value measurements. The Update clarifies that a reporting entity should provide fair value measurement disclosures for each class of assets and liabilities measured at fair value. A class is often a subset of assets or liabilities within a line item in the statement of financial assets. Reporting entities should also provide disclosures about the valuation techniques and inputs used to measure fair value for fair value measurements falling within Level 2 or 3. The new disclosures and clarifications of existing disclosures are effective for interim and annual reporting periods beginning after December 15, 2009, except for the purchases, sales, issuances, and settlements in the roll forward of activity in Level 3 fair value measurements. Those disclosures are effective for fiscal years beginning after December 15, 2010, and for interim periods within those fiscal years. Information on fair value measurements is included in Note F to the consolidated financial statements.

In September 2009, the FASB issued guidance with respect to how entities calculate net asset value per share or "NAV" of investments considered "alternative investments", such as hedge funds, private equity funds, or funds of funds. This guidance provides a practical expedient for measuring the fair value of investments in a limited number of entities that calculate NAV. This guidance provides enhanced disclosure requirements and is effective for a reporting entity's first annual reporting period beginning after December 15, 2009. Early application is permitted in

financial statements that have not yet been issued. The Company did not early adopt this guidance. The effect of adopting this new guidance did not have any material effect on the Company's operating results or financial condition.

NOTE C - EARNINGS PER SHARE

Basic earnings per common share is net income divided by the weighted average number of common shares outstanding during the period. ESOP shares are considered outstanding for this calculation unless unearned. Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable under stock options. Earnings and dividends per common share are restated for all stock splits and stock dividends through the date of issue of the financial statements.

A reconciliation of the numerators and denominators of basic and diluted earnings per share for the three month periods ended March 31, 2010 and 2009 is as follows (dollars in thousands, except per share data):

Stock option awards outstanding that were anti-dilutive, and therefore not included in the computation of diluted earnings per share, were as follows: 211,730 and 229,778 as of March 31, 2010 and 2009, respectively.

NOTE D - STOCK OPTIONS

Shareholders of the Company approved a stock option plan in April 2000 and a stock incentive plan in June 2005. The plans were authorized to issue up to 115,500 and 157,500 shares, respectively. In May 2008, shareholders of the Company ratified amendments to the Stock Incentive Plan of 2005, which among other things increased the authorized shares from 157,500 to 300,000. On March 20, 2010, the April 2000 plan terminated. As of March 31, 2010, there were 104,726 shares available for future issuance under the 2005 plan.

A summary of stock option activity is as follows for the three months ended March 31, 2010:

The fair value of each option award is estimated on the date of grant using a Black-Scholes option valuation model that uses the weighted average assumptions noted in the following table. The expected volatility and life assumptions are based on historical experience. The interest rate is based on the U.S. Treasury yield curve and the dividend assumption is based on the Company's history and expected dividend payouts. Following are the assumptions used in calculating the fair value of the options issued during the first quarter of 2010:

The Company recorded compensation expense of $20,000 and $22,000, respectively, related to the stock options during the three month periods ended March 31, 2010 and 2009.

Restricted Stock - Shares of restricted stock may also be granted under the Stock Incentive Plan of 2005 described above. Compensation expense is recognized over the vesting period of the shares based on the market value of the shares on the grant date. All shares of restricted stock issued and outstanding vest 20% per year over five years. Compensation expense related to the award of shares of restricted stock of $15,000 was recorded during the three months ended March 31, 2010. As of March 31, 2010, there was $408,000 of total unrecognized compensation expense related to non-vested shares of restricted stock granted under the plan which is expected to be recognized over a weighted average period of 3.9 years.

NOTE E - FAIR VALUE INFORMATION

The following methods and assumptions were used by the Company in estimating fair values for financial instruments:

While these estimates of fair value are based on management's judgment of appropriate factors, there is no assurance that if the Company had disposed of such items at March 31, 2010 or December 31, 2009, the estimated

fair values would have been achieved. Market values may differ depending on various circumstances not taken into consideration in this methodology. The estimated fair values at March 31, 2010 and December 31, 2009, should not be considered to apply at subsequent dates.

In addition, other assets and liabilities that are not defined as financial instruments are not included in the following disclosures, such as property and equipment. Also, non-financial instruments typically not recognized in financial statements may have value but are not included in the following disclosures. These include, among other items, the estimated earnings power of core deposit accounts, trained work force, customer goodwill and similar items.

The estimated fair values of the Company's financial instruments are as follows (in thousands):

The preceding table does not include net cash surrender value of life insurance and dividends payable which are also considered financial instruments. The estimated fair value of such items is considered to be their carrying amount.

The Company also has unrecognized financial instruments which include commitments to extend credit and standby letters of credit. The estimated fair value of such instruments is considered to be their contract amount.

NOTE F - FAIR VALUE MEASUREMENTS

The Fair Value Measurements Topic of ASC 820-10 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. ASC 820-10-20 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability shall not be adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact, and (iv) willing to transact.

ASC 820-10 requires the use of valuation techniques that are consistent with the market approach, the income approach, and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert future amounts, such as cash flows or earnings, to a single present amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost). Valuation techniques should be consistently applied. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Inputs may be

observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity's own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. In that regard, ASC Topic 820-10-55 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows:

Level 1 Inputs - Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.

Level 2 Inputs - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risks, etc.), or inputs that are derived principally from or corroborated by market data by correlation or other means.

Level 3 Inputs - Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity's own assumptions about the assumptions that market participants would use in pricing the assets or liabilities.

A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, follows. These valuation methodologies were applied to all of the Company's financial and nonfinancial assets and liabilities carried at fair value.

In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality, the company's creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. The Company's valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company's valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date.

Securities Available for Sale. Securities classified as available for sale are reported at fair value utilizing Level 1, Level 2 and Level 3 inputs. Unadjusted quoted prices in active markets for identical assets are utilized to determine fair value at the measurement date for Level 1 securities.  For all other securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the bond's terms and conditions, among other things. When there are unobservable inputs, such securities are classified as Level 3.

Securities available for sale classified as Level 3 inputs represent non-publicly traded municipal issues with limited trading activity from entities within the Company's market area. The fair value of these investments was determined using Level 3 valuation techniques, as there is no market available to price these investment securities. The method used for determining the fair value for these investment securities included a comparison to the fair value of other investment securities valued with Level 2 inputs with similar characteristics (credit, time to maturity, call structure, etc.) and the interest yield curve for comparable debt investment securities.

Impaired Loans. The Company does not record impaired loans at fair value on a recurring basis. However, periodically, a loan is considered impaired and is reported at the fair value of the underlying collateral, less estimated costs to sell, if repayment is expected solely from the collateral. Impaired loans measured at fair value typically consist of loans on nonaccrual status and loans with a portion of the allowance for loan losses allocated specific to the loan. Some loans may be included in both categories whereas other loans may only be included in one category. Collateral values are estimated using level 2 inputs, including recent appraisals, and Level 3 inputs

based on customized discounting criteria.  Due to the significance of the level 3 inputs, impaired loans have been classified as level 3.

Other Real Estate Owned (OREO). The Company values OREO at the fair value of the underlying collateral less expected selling costs. Collateral values are estimated primarily using appraisals and reflect a market value approach.

The following table presents the fair value measurements of assets recognized in the accompanying consolidated balance sheet measured at fair value on a recurring basis and the level within the FASB ASC fair value hierarchy in which the fair value measurements fall at March 31, 2010 (in thousands):

The following table presents the fair value measurements of assets recognized in the accompanying consolidated balance sheet measured at fair value on a non recurring basis and the level within the FASB ASC fair value hierarchy in which the fair value measurements fall at March 31, 2010 (in thousands):

Impaired loans are reported net of a $1,337,000 allowance for loan losses.

The following table summarizes financial and nonfinancial assets (there were no financial or nonfinancial liabilities) measured at fair value as of December 31, 2009, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):

Impaired loans are reported net of a $1,550,000 allowance for loan losses.

The following is a reconciliation of the beginning and ending balances of securities available for sale which are measured at fair value on a recurring basis using significant unobservable (Level 3) inputs during the quarter ending March 31, 2010 (in thousands):

NOTE G - SUBSEQUENT EVENT

Management evaluated subsequent events through the date the financial statements were issued. Events or transactions occurring after March 31, 2010, but prior to when the financial statements were issued, that provided additional evidence about conditions that existed at March 31, 2010, have been recognized in the financial statements for the three month period ended March 31, 2010. Events or transactions that provided evidence about conditions that did not exist at March 31, 2010, but arose before the financial statements were issued, have not been recognized in the financial statements for the three month period ended March 31, 2010.

          The following discussion provides information about the financial condition and results of operations of the Company and its subsidiary, Southern Michigan Bank & Trust (SMB&T) for the three month periods ended March 31, 2010 and 2009.

Executive Summary

          For the first three months of 2010, the Company recorded net income of $702,000 and basic and diluted earnings per share of $0.30, compared with a net loss of $271,000 and basic and diluted loss per share of $0.12 for the first three months of 2009. A $1.25 million decrease in the provision for loan losses, as compared to the same period last year, was the primary reason for the increase in net income. Other reasons included an increase in non-interest income of $136,000, or 9.1%, and a reduction in non-interest expenses of $57,000, or 1.2%, offset by a $49,000, or 1.2%, decrease in net interest income in the first quarter of 2010 compared to the same quarter of 2009. The increase in non-interest income was principally due to the $156,000 gain on life insurance proceeds during the first quarter of 2010 as a result of the death of a former director. Details of the changes in the various components of net income are discussed further below.

          Return on average assets was 0.60% for the first three months of 2010 compared to -0.23% for the first three months of 2009. Return on average shareholders' equity was 6.08% for the first three months of 2010 compared to -2.40% for the same period in 2009.

          Total consolidated assets at March 31, 2010 were $464.2 million compared to $462.4 million at December 31, 2009. Cash balances remained elevated as of March 31, 2010, as compared to December 31, 2009, due to maturities in the securities portfolio awaiting reinvestment and anticipated first quarter reduction in the loan portfolio.

Results of Operations

          Net Interest Income

          The Company derives the greatest portion of its income from net interest income. Declining interest rates over the past two years have reduced the Company's yield on earning assets, as well as reducing its cost of funds. During the first quarter of 2010, the Company was able to lower its cost of funds by 31 basis points compared to the first quarter of 2009, and tax equivalent yields on average interest earning assets for the same comparable periods declined by 24 basis points. While this resulted in an improvement in the interest rate spread, the tax equivalent net interest margin was reduced due to a $9.6 million reduction in total interest earning assets.

          The following tables provide information regarding interest income and expense for the three-month periods ended March 31, 2010 and 2009, respectively. Table 1 shows the year-to-date daily average balances for interest earning assets and interest bearing liabilities, interest earned or paid, and the annualized effective rate for the three-month periods ended March 31, 2010 and 2009. Table 2 shows the effect on interest income and expense of changes in volume and interest rates on a tax equivalent basis.

Table 1 - Average Balances and Tax Equivalent Interest Rates

(Dollars in Thousands):