State of Maine Business Income Tax Extensions

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General Instructions

Maine corporate income tax returns are due by the 15th day of the 3rd month following the close of the tax year. For calendar year filers, this date is March 15. If you cannot file on time, you can get a Maine tax extension.

Maine business extensions are automatic, which means there is no form or application to submit. As long as 90% of your Maine tax liability is paid by the original deadline (March 15), you will automatically receive more time to file. A Maine tax extension gives you 7 extra months to file your return, moving the due date to October 15.

You can make a state extension payment using Form 1120EXT-ME (Maine Extension Tax Payment Voucher for Corporations). Tax payments can also be made online via Maine EZ Pay:

For more information, please visit the Maine Revenue Services website:

Maine State Income Tax Extension Forms


Tax Return Forms (Maine Extension Tax Payment Voucher for Corporations):


Mail with payment to the following address:

Maine Revenue Services

P.O. Box 9101

Augusta, ME  04332-9101