New England · ME
How to file Maine sales tax
2026 due dates, filing frequencies, form ST-7, and official filing resources.
- State return: ST-7
- Monthly returns due: 15th of the month following the period
- Filing frequencies: Monthly, Quarterly, Semi-annual, Annual
When is Maine sales tax due?
Monthly Maine sales tax returns are due the 15th of the month following the period. Quarterly returns are due the 15th of the month following the quarter (calendar quarters). When a due date lands on a weekend or federal holiday it moves to the next business day; the 2026 calendar on this page already applies that adjustment.
Maine sales tax due dates for 2026
Every date below comes from the state's published deadline rule (dataset 2026.07.0) and is already moved to the next business day when it lands on a weekend or federal holiday. Your account's assigned filing frequency decides which table applies.
Monthly Maine sales tax due dates
Rule: 15th of the month following the period.
| Period | Period ends | Return due |
|---|---|---|
| January 2026 | Jan 31, 2026 | Feb 17, 2026 (moved: 2026-02-15 falls on a Sunday) |
| February 2026 | Feb 28, 2026 | Mar 16, 2026 (moved: 2026-03-15 falls on a Sunday) |
| March 2026 | Mar 31, 2026 | Apr 15, 2026 |
| April 2026 | Apr 30, 2026 | May 15, 2026 |
| May 2026 | May 31, 2026 | Jun 15, 2026 |
| June 2026 | Jun 30, 2026 | Jul 15, 2026 |
| July 2026 | Jul 31, 2026 | Aug 17, 2026 (moved: 2026-08-15 falls on a Saturday) |
| August 2026 | Aug 31, 2026 | Sep 15, 2026 |
| September 2026 | Sep 30, 2026 | Oct 15, 2026 |
| October 2026 | Oct 31, 2026 | Nov 16, 2026 (moved: 2026-11-15 falls on a Sunday) |
| November 2026 | Nov 30, 2026 | Dec 15, 2026 |
| December 2026 | Dec 31, 2026 | Jan 15, 2027 |
Quarterly Maine sales tax due dates
Rule: 15th of the month following the quarter (calendar quarters).
| Period | Period ends | Return due |
|---|---|---|
| Q1 2026 | Mar 31, 2026 | Apr 15, 2026 |
| Q2 2026 | Jun 30, 2026 | Jul 15, 2026 |
| Q3 2026 | Sep 30, 2026 | Oct 15, 2026 |
| Q4 2026 | Dec 31, 2026 | Jan 15, 2027 |
Semi-annual Maine sales tax due dates
Rule: 15th after the half-year (due Jul 15 / Jan 15).
| Period | Period ends | Return due |
|---|---|---|
| January–June 2026 | Jun 30, 2026 | Jul 15, 2026 |
| July–December 2026 | Dec 31, 2026 | Jan 15, 2027 |
Annual Maine sales tax due dates
Rule: January 15 following the calendar year.
| Period | Period ends | Return due |
|---|---|---|
| Calendar year 2026 | Dec 31, 2026 | Jan 15, 2027 |
Maine filing notes
No additional state-specific filing notes are recorded for this cadence set.
Return and form
The principal repository-tracked return is ST-7. Paper eligibility is taxpayer-specific; electronic filing or a waiver may control.
Tracked form version: ST-7 Revised 01/2026
Paper filing posture: taxpayer specific
Official Maine filing resources
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Workflow support does not by itself establish registration, filing authority, credentials, agency acceptance, or tax advice. Confirm your assigned filing frequency with the state.
Maine sales tax filing questions
When is Maine sales tax due?
Monthly Maine sales tax returns are due the 15th of the month following the period. Quarterly returns are due the 15th of the month following the quarter (calendar quarters). When a due date lands on a weekend or federal holiday it moves to the next business day; the 2026 calendar on this page already applies that adjustment.
How often do you file sales tax in Maine?
Maine assigns a filing frequency to each account. The published cadences are monthly, quarterly, semi-annual and annual filing; the state assigns the frequency based on tax volume and notifies the account, so confirm the assigned basis before relying on a calendar.
What form is used to file Maine sales tax?
The Maine return tracked here is ST-7. The principal repository-tracked return is ST-7. Paper eligibility is taxpayer-specific; electronic filing or a waiver may control.
What happens if a Maine due date falls on a weekend or holiday?
The due date moves to the next business day. In 2026, 4 of the Maine due dates listed on this page are adjusted for a weekend or federal holiday; each adjusted date is marked in the calendar.
Can Maine sales tax be filed on paper?
Paper filing posture tracked for Maine: taxpayer specific. The principal repository-tracked return is ST-7. Paper eligibility is taxpayer-specific; electronic filing or a waiver may control.