Maine sales tax is filed online through the Maine Tax Portal (MeRevenue, at revenue.maine.gov), run by Maine Revenue Services, on the state's Sales and Use Tax Return. Returns are due on the 15th of the month after the reporting period, and a return is required every period, even when there are no taxable sales. Maine Revenue Services requires sales and use tax returns to be filed electronically unless the Department grants a waiver.
This guide covers who files and how often, how to file in the Maine Tax Portal, how Maine's rates work, how to handle a return with no sales, how to amend a return, how to pay, and what late filing costs.
This article is educational information, not tax advice. Filing rules, thresholds, and penalties can change, so confirm current requirements with Maine Revenue Services before you file.
Maine sales tax filing at a glance
- Who administers it: Maine Revenue Services, Sales, Fuel & Special Tax Division.
- Online portal: Maine Tax Portal, at revenue.maine.gov.
- Return: Sales and Use Tax Return. Businesses report use tax on the same return.
- Filing frequency: Monthly, quarterly, semiannual, or annual, based on average tax liability.
- Due dates: The 15th of the month after the reporting period. If the 15th falls on a weekend or holiday, the return is due the next day that is not a weekend or state holiday.
- Zero returns: Required. The return must be filed even if there are no taxable sales to report.
- Payment: Pay when you file, by ACH debit scheduled in the portal or by check with a payment voucher.
- Economic nexus: More than $100,000 in gross revenue from sales delivered into Maine in the previous or current calendar year.
Who has to file, and how often
A business located in Maine that regularly sells tangible personal property or taxable services must register for a sales tax account and file returns. Remote sellers must register in the same way as a seller with a physical presence in Maine once gross revenue from sales of tangible personal property, products transferred electronically, or taxable services delivered into Maine exceeds $100,000 in the previous or current calendar year. The Department's Business Guide applies the same $100,000 measure to marketplace facilitators. Our Maine sales tax guide covers registration and nexus in more detail. For a related question on the buying side, see our post on whether retailers are exempt from sales tax in Maine.
Your filing frequency depends on your average tax liability. Under Maine Revenue Services Rule 304, and as summarized in the Department's FAQ:
| Frequency | Average tax liability | Reporting periods | Due dates |
|---|---|---|---|
| Monthly | $600 or more per month | Each calendar month | The 15th of the following month |
| Quarterly | $100 or more but less than $600 per month | Jan to Mar, Apr to Jun, Jul to Sep, Oct to Dec | April 15, July 15, October 15, and January 15 |
| Semiannual | Less than $100 per month but more than $50 per year | Jan to Jun, Jul to Dec | July 15 and January 15 |
| Annual | Less than $50 per year | Calendar year | January 15 |
The default under Rule 304 is monthly filing. Maine Revenue Services reviews account liabilities each year and adjusts frequencies as needed, and it notifies taxpayers of a change. Retailers may also request a different or more frequent schedule. A business that is completely closed for one or more calendar months on a regular schedule each year can register as a seasonal filer and skip the periods when it is closed.
Before you start: get into the Maine Tax Portal
You need a Maine sales tax account before you can file; our sales tax permit overview explains the process. Registration is done through the Maine Tax Portal, and the Department's Business Guide says there is no fee. Anyone other than a sole proprietor needs a federal EIN to register. To file, you create a username and password in the portal, and first-time users are prompted to set up two-step verification with an authentication app, text, or email. Your registration number is an 8-digit number on your retailer certificate and in your filing reminder notification.
Before filing, gather gross sales for the period, sales you treat as exempt, and records for any credits you claim. For wholesale sales, see our Maine resale certificate guide for what to collect from buyers.
Step-by-step: filing a Maine return in the Maine Tax Portal
The Department's FAQ describes the steps this way:
- Log in to the Maine Tax Portal at revenue.maine.gov with your username and password.
- Open the Summary tab, select the tax type, such as Sales and Use Tax, and click View and File Returns.
- Choose the period. You will see a list of filing periods. Click File Now for the period you are filing.
- Complete the return. Click Next and follow the prompts. Report gross sales, exempt sales, and taxable sales by rate category, then any credits.
- Pay or print a voucher. If you owe tax, the portal asks for a payment method and lets you schedule payment while you file.
- Save your confirmation number. The portal shows a success message with a confirmation number once the return is filed.
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Rates and other pitfalls
Maine Revenue Services publishes one set of statewide rates by category, and its rates page lists no city or county rates. The general sales tax rate is 5.5%. Prepared food is 8%, rentals of lodging are 9%, and short-term auto rentals are 10%, with separate rates for cannabis. Use tax is 5.5%. Our Maine sales tax calculator shows current rates.
A few points trip up new filers:
- Sales shipped out of state. The Department says sales tax does not apply when the seller delivers the property to a location outside Maine or arranges direct shipment out of state by common or contract carrier. Keep the sales slip and shipping invoice showing that.
- Exempt sales still count as gross sales. Gross sales include sales for resale and other exempt sales, but not the sales tax charged to customers.
- Resale certificates. To qualify for a Maine resale certificate, a retailer must have an active account and report gross sales of $3,000 or more per year.
- Rates change. Some services formerly subject to Maine's service provider tax became subject to sales tax on January 1, 2026, so check which line your sales belong on.
Due dates and the weekend rule
Returns are due on the 15th of the month after the reporting period ends. You can see them alongside other states on our Maine sales tax due dates page. If the 15th falls on a weekend or holiday, the return is due on the next day that is not a weekend or state holiday. Retailers may apply to the State Tax Assessor for a 30-day extension to file for good cause, but the extension does not extend the time to pay.
Filing a zero return
You must file even if you had no taxable sales. The Department's return instructions say the return must be filed even if there are no taxable sales to report, and its Business Guide says paper filers with a waiver must file by the due date whether or not any tax is due. If you sell only in some months, ask about seasonal filing rather than skipping returns. Use tax returns for people who are not required to be registered as retailers are different, and are needed only in periods when tax is due.
Amending a return
To amend a return in the Maine Tax Portal, follow the same steps as filing. When you reach the list of filing periods, click View or Amend Return instead of File Now. The portal has instructional guides for single-location and multiple-location accounts.
Payment methods
- ACH debit through the portal: When you file, the portal asks whether you want to make a payment right now. If you say yes, you enter your bank information and schedule the payment before completing the return.
- Check with a payment voucher: If you say no, you finish the return and print a voucher to send with your check, payable to the State Treasurer.
- Electronic payments may be required: The Business Guide says Rule 102 requires businesses whose prior-year combined liability meets certain thresholds to pay electronically. Confirm with the Department whether that applies to you.
A return must be filed for the period before a payment can be made. If you see a "Return not filed for period" error, you most likely chose Make Payment instead of File My Return.
Penalties and interest for late payment
The Department's FAQ lists these penalties:
- Failure to file: $25 or 10% of the tax due, whichever is greater, if the return is not filed by the due date. If it is not filed within 60 days after a formal demand, the penalty is $25 or 25% of the tax due.
- Failure to pay: 1% of the unpaid tax per month or part of a month, up to a maximum of 25%.
Interest is charged on unpaid tax and is compounded monthly. The rate is set each January 1, and the Department's interest rate page lists 9% for January 1 through December 31, 2026. Filing an extension does not extend the time to pay.
Common mistakes to avoid
- Skipping returns with no sales. File every period, even at zero.
- Choosing Make Payment instead of File My Return. The return must be filed first.
- Including sales tax in gross sales. Gross sales exclude the tax you charged customers.
- Missing a change in frequency. The Department reviews accounts annually and notifies you, so check your assigned schedule.
- Forgetting nexus counts revenue, not just taxable sales. The $100,000 test looks at gross revenue from sales delivered into Maine.
- Paying after the due date. The failure to pay penalty and interest run from the due date.
If you receive a sales tax notice
A missed or late return often leads to a letter. Our Maine sales tax notices guide explains what notices from Maine Revenue Services mean, why businesses usually receive them, and what to do next. It also points to how to ask for penalty relief where the state publishes a process. Check the date on the notice, match it to your filing period, and follow the instructions on the notice itself.
More state filing guides
Filing in more than one state? These step-by-step guides cover the portals, due dates, and penalties in other states. See them all in our state-by-state guide to filing sales tax online.
- How to file Massachusetts sales tax online
- How to file Connecticut sales tax online
- How to file New York sales tax online
Let Kintsugi file for you
If you sell in Maine and other states, Kintsugi's sales tax filing software prepares and files returns on each state's assigned schedule and remits payment. Monitoring across every US state is free, so you know when you cross a threshold. Filing starts at $75 per filing, with no per-state subscription. See pricing, start free, or book a demo.
Frequently asked questions
Can I file Maine sales tax online?
Yes. Maine Revenue Services requires electronic filing of sales and use tax returns through the Maine Tax Portal, unless you get a waiver from the Department.
When is Maine sales tax due?
The 15th of the month after the reporting period. Quarterly returns are due April 15, July 15, October 15, and January 15. Semiannual returns are due July 15 and January 15, and annual returns are due January 15. If the 15th is a weekend or holiday, the due date moves to the next day that is not a weekend or state holiday.
Do I have to file if I had no sales?
Yes. The Department's instructions say the return must be filed even if there are no taxable sales to report.
How often do I file in Maine?
It depends on your average tax liability: monthly at $600 or more per month, quarterly from $100 up to $600, semiannual below $100 per month but above $50 per year, and annual below $50 per year. The Department reviews your frequency annually.
What is the economic nexus threshold in Maine?
Gross revenue from sales into Maine above $100,000 in the previous or current calendar year.
What if I miss the deadline?
File and pay as soon as possible. The failure to file penalty is $25 or 10% of the tax due, whichever is greater, the failure to pay penalty is 1% per month up to 25%, and interest accrues on unpaid tax.
Sources
Checked September 29, 2026.
- Maine Revenue Services, Sales and Use Tax FAQ
- Maine Revenue Services, Sales and Use Tax Rates & Due Dates
- Maine Revenue Services, Rule 304, Sales and Use Tax Returns and Payments
- Maine Revenue Services, Business Guide to Sales and Use Tax (revised December 22, 2025)
- Maine Revenue Services, Sales and Use Tax Return and instructions
- Maine Revenue Services, Interest rates, 1992 to present
- Maine Tax Portal
