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The Michigan Department of Treasury does not require that you file for an extension of time to file your state tax return if you are filing for a federal extension. Michigan will grant an automatic six-month extension of time to file until October 15, 2015 with a federal extension.
You can file an amended return for any tax year if the original return was accepted by the IRS and/or state. You cannot amend a tax return for 2015 or a prior year to claim Earned Income Credit, Child Tax Credit or American Opportunity Credit if you or the dependent did not have their current SSN or ITIN prior to the due date for that tax year.