You cannot legally collect Maine sales tax without a Retailer’s Certificate. Remote sellers who cross $100,000 in Maine sales trip this requirement without noticing. Maine Revenue Services (MRS) issues the certificate for free through its Sales and Use Tax program. This guide covers who must register, how to do it online, what it costs, how long it takes, the rate you collect, and how to file afterward.
Whether you run a storefront in Portland, sell at seasonal markets, or ship ecommerce orders from another state, the same rules apply once you have nexus.
What Is a Maine Sales Tax Permit (Retailer’s Certificate)?
A Maine sales tax permit is officially a Retailer’s Certificate, issued free by Maine Revenue Services when you register to collect and remit sales and use tax, per the MRS Sales, Use & Service Provider Tax FAQ. It displays your sales tax registration number. MRS and sellers also call it a registration number, sales tax account, retailer number, or sales tax ID number.
What is the difference between a Retailer’s Certificate and a Resale Certificate?
A Retailer’s Certificate authorizes you to collect and remit sales tax. A Resale Certificate is different: it lets a registered retailer buy inventory tax-free for resale, per MRS Instructional Bulletin 54 (IB54). MRS issues a Resale Certificate only to retailers reporting $3,000 or more in annual gross sales, and it is valid for up to 5 calendar years (IB54).
Do You Need a Sales Tax Permit in Maine?
Yes, if you have physical or economic nexus in Maine. Physical nexus means a physical presence such as a store, staff, or inventory in the state. Economic nexus means enough remote sales to trigger registration. The table below lists each trigger and its source.
| Nexus trigger | Type | Source |
|---|---|---|
| Retail store, warehouse, or office in Maine | Physical | MRS Business Guide |
| Taxable sales made with a physical presence in Maine | Physical | MRS Business Guide |
| Selling at trade shows, markets, or temporary events in Maine | Physical | MRS Business Guide |
| Remote seller over $100,000 in gross Maine sales (current or prior calendar year) | Economic | 36 M.R.S. §1754-B |
| Marketplace facilitator over $100,000 in Maine sales | Economic | 36 M.R.S. §1754-B |
What Is Maine’s Economic Nexus Threshold in 2026?
Maine’s economic nexus threshold is $100,000 in gross sales delivered into Maine in the current or previous calendar year, per 36 M.R.S. §1754-B. Maine uses no transaction-count test. Many states still apply a 200-transaction rule; Maine’s only trigger is revenue.
Maine removed the old 200-transaction alternative through LD 1216, enacted as Public Law 2021, chapter 181 (Maine Legislature). Once you cross $100,000, you must register and start collecting no later than the first day of the first month beginning within 30 days of crossing it, per MRS Instructional Bulletin 43. See Commenda’s US economic nexus guide for every state’s thresholds and the Maine sales tax guide for Maine specifics.
What Are Maine’s Marketplace Facilitator Rules?
A marketplace facilitator that exceeds $100,000 in Maine sales must collect and remit tax for its third-party sellers, per 36 M.R.S. §1754-B. Maine treats the facilitator as the retailer for each facilitated sale (36 M.R.S. §1951-C), and this collection law took effect for sales on or after October 1, 2019.
Selling through a collecting marketplace does not automatically exempt you from registering. You may still need your own Retailer’s Certificate if you also sell direct or across multiple platforms.
How Do You Register for a Sales Tax Permit in Maine Online?
Register free through the Maine Tax Portal at revenue.maine.gov. In the Businesses panel, click “Register a New Business – Start Here” and follow the prompts (MRS FAQ). MRS typically approves online applications in 3 to 5 business days. Follow the five steps below.
1. Gather your business information
Collect your EIN or SSN, legal business name and structure, business address and contact details, responsible party information, NAICS code, and estimated Maine sales.
2. Create a Maine Tax Portal account
Go to the Maine Tax Portal and create an account if you do not already have one.
3. Complete the Sales and Use Tax application
Select “Sales and Use Tax” as the tax type and enter your business details. Check everything carefully to avoid delays.
4. Submit your application
Review and submit your application online. There is no fee.
5. Receive your Retailer’s Certificate
MRS delivers your Retailer’s Certificate by email or mail after approval.
What Information Do You Need to Register?
You need your EIN (Employer Identification Number) or SSN (Social Security Number), legal name and entity type, business addresses and contact details, responsible party details, a NAICS code, estimated Maine sales, and your start date. Any entity other than a sole proprietor must supply an EIN (MRS FAQ).
| Category | Item | Notes |
|---|---|---|
| Business identification | EIN or SSN | Sole proprietors may use an SSN; other entities must supply an EIN (MRS FAQ) |
| Business identification | Legal name and DBA | DBA means “doing business as” |
| Business identification | Entity type | LLC (limited liability company), corporation, sole proprietor, and similar |
| Contact | Physical and mailing address | Required for the account |
| Contact | Phone and email | MRS uses these to reach you |
| Contact | Responsible party details | Name and SSN of the person with authority over the business’s tax matters |
| Tax profile | NAICS code | Identifies your primary business activity |
| Tax profile | Estimated Maine sales | Used to set your filing frequency |
| Tax profile | Start date | When Maine sales activity begins |
What is a NAICS code and how do you find yours?
NAICS stands for North American Industry Classification System. It is a code describing your primary business activity, and every Maine registrant must enter one (MRS FAQ). Find yours with the U.S. Census Bureau’s NAICS search tool.
How Much Does a Maine Sales Tax Permit Cost?
Registration is free. Maine charges no fee to register and no renewal fee (MRS Business Guide). The Retailer’s Certificate has no expiration date and stays valid until you cancel it or MRS revokes it, per IB54.
How Long Does It Take to Get a Maine Sales Tax Permit?
MRS typically approves online applications in 3 to 5 business days, then delivers your Retailer’s Certificate by email or mail. MRS contacts you directly if it needs more information. Check your inbox and spam folder after applying. For help, call MRS at (207) 624-9693 or email taxpayerassist@maine.gov.
What Sales Tax Rate Will You Collect in Maine?
Maine’s general state sales tax rate is 5.5% in 2026, and Maine has no local sales taxes, so one statewide rate applies everywhere, per the MRS Sales, Use & Service Provider Tax rates page. Higher rates apply to prepared food, lodging, and short-term auto rentals, shown below.
| Sale type | Rate (2026) | Source |
|---|---|---|
| General tangible personal property | 5.5% | MRS rates page |
| Prepared food | 8% | MRS rates page |
| Rental of living quarters (lodging) | 9% | MRS rates page |
| Short-term auto or light-truck rental | 10% | MRS rates page |
Maine also levies a separate Service Provider Tax on certain services, distinct from the general sales tax (MRS).
What Happens After You Register?
You collect Maine sales tax on taxable sales, file returns on your assigned schedule, and remit what you collect. File a zero return even in periods with no sales. Manage everything in the Maine Tax Portal. MRS sets your filing frequency by sales volume.
How does Maine set your filing frequency?
MRS assigns your frequency by average monthly tax liability, per the MRS FAQ.
| Filing frequency | Average monthly tax liability | Source |
|---|---|---|
| Monthly | $600 or more | MRS FAQ |
| Quarterly | $100 to $599 | MRS FAQ |
| Semiannual | Under $100/month but over $50/year | MRS FAQ |
| Annual | Under $50/year | MRS FAQ |
Use tax applies when you use taxable goods in Maine and paid no sales tax at purchase. You report use tax on the same returns (MRS).
What Are the Penalties for Not Registering or Filing Late?
Failing to register when required exposes you to back taxes, penalties, and interest. Late or missed filings, including missed zero returns, draw penalties and possible account suspension. Selling without registering when required is a Class E crime under Maine law (36 M.R.S. §1754-B). File on time every period, even with no sales.
How Commenda Helps With Maine Sales Tax Registration and Compliance
Commenda’s indirect tax software tracks your physical and economic nexus across every state, then handles registrations and filings from one place. It flags Maine before you cross the $100,000 threshold, files returns on the schedule MRS assigns, and keeps your zero returns on time.
Check thresholds with Commenda’s US economic nexus guide and the Maine sales tax guide, and look up rates with the sales tax calculator. Commenda connects to 100+ ERPs, APIs, and platform integrations like QuickBooks, NetSuite, and Shopify.
Book a demo for a free nexus exposure assessment covering Maine and every other state you sell into.
