Michigan Filing Due Date: Business tax returns are due by April 30 — or by the last day of the 4th month following the close of the taxable year (for fiscal year filers).
Extended Deadline with Michigan Tax Extension: Michigan offers a 4-month business extension, which moves the filing deadline to the last day of the 8th month following the original deadline of your return (August 30 for calendar year filers).
Michigan Tax Extension Form: To request a Michigan extension, file Form 4 by the original deadline of your return.
Michigan Extension Payment Requirement: An extension of time to file is not an extension of time to pay. Your Michigan tax balance must be paid by the original due date to avoid penalties and interest. If you owe tax, you must include your Michigan extension payment with Form 4.
Michigan Tax Extension Tip: A Federal tax extension (IRS Form 7004) will not automatically extend your Michigan business filing deadline. In order to obtain a Michigan tax extension, you must make a request using Form 4.