LoginStart free trial

How to file Maine sales tax

2026 due dates, filing frequencies, form ST-7, and official filing resources.

State returnST-7
Monthly returns due15th of the month following the period
Filing frequenciesMonthly, Quarterly, Semi-annual, Annual
Rules verifiedJuly 2, 2026

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.

01

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.

PeriodPeriod endsReturn due
January 2026Jan 31, 2026Feb 17, 2026 (moved: 2026-02-15 falls on a Sunday)
February 2026Feb 28, 2026Mar 16, 2026 (moved: 2026-03-15 falls on a Sunday)
March 2026Mar 31, 2026Apr 15, 2026
April 2026Apr 30, 2026May 15, 2026
May 2026May 31, 2026Jun 15, 2026
June 2026Jun 30, 2026Jul 15, 2026
July 2026Jul 31, 2026Aug 17, 2026 (moved: 2026-08-15 falls on a Saturday)
August 2026Aug 31, 2026Sep 15, 2026
September 2026Sep 30, 2026Oct 15, 2026
October 2026Oct 31, 2026Nov 16, 2026 (moved: 2026-11-15 falls on a Sunday)
November 2026Nov 30, 2026Dec 15, 2026
December 2026Dec 31, 2026Jan 15, 2027

Quarterly Maine sales tax due dates

Rule: 15th of the month following the quarter (calendar quarters).

PeriodPeriod endsReturn due
Q1 2026Mar 31, 2026Apr 15, 2026
Q2 2026Jun 30, 2026Jul 15, 2026
Q3 2026Sep 30, 2026Oct 15, 2026
Q4 2026Dec 31, 2026Jan 15, 2027

Semi-annual Maine sales tax due dates

Rule: 15th after the half-year (due Jul 15 / Jan 15).

PeriodPeriod endsReturn due
January–June 2026Jun 30, 2026Jul 15, 2026
July–December 2026Dec 31, 2026Jan 15, 2027

Annual Maine sales tax due dates

Rule: January 15 following the calendar year.

PeriodPeriod endsReturn due
Calendar year 2026Dec 31, 2026Jan 15, 2027
02

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

03
04

File Maine sales tax from reviewed data, not spreadsheets

Prophit.ai tracks every Maine due date above inside the return workspace, builds the period from your transaction data, and produces worksheet for portal entry that a reviewer approves before anything is submitted.

See sales tax filing softwareCompare plans — from $199/month

Need every state at once? Download the 2026 sales tax filing calendar (CSV + ICS, all states, weekend/holiday-adjusted).

Workflow support does not by itself establish registration, filing authority, credentials, agency acceptance, or tax advice. Confirm your assigned filing frequency with the state.

05

Maine sales tax filing questions

01When 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.

02How 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.

03What 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.

04What 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.

05Can 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.

Reviewed and current as of August 22, 2026. Read the full Maine sales tax guide for rates, sourcing, products, exemptions, and marketplace rules.