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Home > FAQs > Corporate Income Tax FAQs 4. When is the Maine corporate income tax return due?The Maine corporate income tax return (Form 1120ME) is due on the same date as your federal corporate income tax return (the fifteenth day of the third month after the end of the tax year), without regard to an extension to file. The Maine filing due date for tax exempt entities subject to tax on unrelated business income (as reported on federal Form 990T) is 4 ½ months after the end of the tax year (May 15 for calendar year filers). 12/3/12 |
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