Maine Personal Tax ExtensionForm 1040EXT-ME

Maine’s Automatic Personal Income Tax Extension – 90% Payment Rule

Maine provides an automatic six-month extension for filing personal income tax returns – no form, no federal extension, and no application required. The Maine Revenue Services automatically extends the filing deadline from April 15, 2026, to October 15, 2026. The key requirement is paying at least 90% of your tax liability by April 15. Maine also offers an optional additional two-month extension beyond October 15 for taxpayers who need it.

Maine’s 90% Payment Requirement

Maine’s automatic extension covers filing only – not payment. To avoid both failure-to-file and failure-to-pay penalties, at least 90% of your total Maine tax liability must be paid by April 15, 2026. You can pay any remaining balance when you file. Falling short of the 90% threshold triggers both penalties on the underpaid amount.

Optional Additional Two-Month Extension

If October 15 isn’t enough time, Maine allows a written request for an additional two-month extension to December 15, 2026. The request must be submitted to Maine Revenue Services before the October 15 deadline. This is useful for complex returns requiring extra preparation time.

Using Form 1040EXT-ME

Form 1040EXT-ME (Extension Payment Voucher for Individual Income Tax) is used when mailing a payment. If paying through Maine Tax Portal, no form is required – ACH debit is free. An account may be required to log in.

Late Filing and Payment Penalties

Maine’s failure-to-file penalty is the greater of $25 or 10% of unpaid tax if filed within 60 days of a demand notice, rising to the greater of $25 or 25% after that. The failure-to-pay penalty is 1% per month, up to 25%. Both penalties are eliminated by paying 90% by April 15 and filing by October 15.

Best Practices

• ✓No form or federal extension needed – Maine’s extension is fully automatic.
• ✓Pay at least 90% of your Maine tax liability by April 15, 2026.
• ✓Use Maine Tax Portal (revenue.maine.gov) for free ACH debit – no login required.
• ✓If you need more time, submit a written request for the additional 2-month extension before October 15.
• ✓File your completed Maine return by October 15, 2026 (or December 15 if the extra extension is obtained).

Maine’s extension is one of the most straightforward available – automatic, no paperwork, no federal dependency, and with the option for additional time if you need it. Pay 90% by April 15 and file by October 15.

Quick Reference Table

Mailing Address with Payment