Michigan Business Tax Quarterly Estimated Returns and instructions will be mailed to businesses in early January 2008. Form 160 Combined Return for Michigan Taxes may also be used to make estimated payments; Form 160 will be mailed to businesses beginning in November 2007.

Filing/Payment Due Dates

Taxpayers expecting a 2008 tax liability to exceed $800 must file quarterly estimates as follows:

• Calendar Year Filers: Return and payment due April 15, 2008; July 15, 2008; October 15, 2008; and January 15, 2009.
• Fiscal Year Filers: Return and payment due the 15th day of the first month after each quarter.

Computing the Estimated Tax

• Sum of estimated payments must equal at least 85% of tax liability and the amount paid approximate the quarter's liability.
• Tax Year 2009 and After: If prior year's tax is $20,000 or less, estimated tax will be prior year's amount in 4 equal payments.

• Annual Returns are due the last day of the 4th month after tax year end with payment of final liability. Taxpayers (other than Insurance Companies or Financial Organizations) are not required to file or pay if apportioned gross receipts are less than $350,000.
• Filing threshold is annualized for tax year less than 12 months.
• Extension granted by department for good cause with application and payment of tax due. If federal extension, automatic extension granted to last day of 8th month with copy of federal request for extension with tentative return and payment of estimated tax.

May elect one of the following:

• Annual method, reporting the taxpayer's full year multiplied by a ratio of the number of months in the tax year included under the MBT over 12.
• Actual method, reporting only those months included under the MBT.

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