Maine State Tax Guide
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Maine State Tax Guide
Extension rules
Extension type: Automatic State Extension · Form 1040EXT-ME
If you do not owe a tax liability then you are granted an automatic 6-month extension. However, if you owe a tax liability you must file Form 1040EXT-ME by April 15th along with your estimated tax payment
If you owe tax: However, if you owe a tax liability you must file Form 1040EXT-ME by April 15th along with your estimated tax payment
If you owe $0: If you do not owe a tax liability then you are granted an automatic 6-month extension.
To avoid a late-payment penalty, Maine requires you to have paid at least 90% of your total tax liability by the original April 15 deadline.
Maine Key deadlines (tax year 2025, return filed in 2026)
- Filing deadline: Apr 15, 2026
- Extension request deadline: Apr 15, 2026 — Automatic unless you owe a tax liability then the deadline to file is April 15, 2026
- Extended return deadline: Oct 15, 2026 (6-month extension)
- Payment deadline: Apr 15, 2026
- Differs from federal: No
To avoid a late-payment penalty, Maine requires you to have paid at least 90% of your total tax liability by the original April 15 deadline.
If the due date for filing your return falls on a Saturday, Sunday, or legal holiday, your return is due by the next regular working day.
October 15, 2026 (6-month extension)
Payment rules
To avoid a late-payment penalty, Maine requires you to have paid at least 90% of your total tax liability by the original April 15 deadline.
Payment options
Filing forms
Extension
- Form 1040EXT-ME · Download form
Maine Refund Tracking
Do I need to file?
If you do not owe a tax liability then you are granted an automatic 6-month extension. However, if you owe a tax liability you must file Form 1040EXT-ME by April 15th along with your estimated tax payment
Filing methods
Online filing
Automatic unless you owe a tax liability, then you must file form 1040EXT-ME by mail or via Maine electronic filing
Mail filing
Automatic unless you owe a tax liability, then you must file form 1040EXT-ME by mail or via Maine electronic filing
