Maine Contractor Taxes and Licensing: What Builders and Trades Should Know

Maine doesn't license general contractors, roofers or framers at the state level, but it does license electricians, plumbers and oil, solid fuel and gas technicians. For sales tax, a contractor is usually the last user of its materials: it pays Maine's 5.5% tax when buying them and doesn't add tax to the customer's bill.

What stands out about Maine for contractors?

Two things. First, the Maine Attorney General's office says that in Maine, "general contractors - and trades such as roofing and framing - are not licensed or regulated." Anyone can call themselves a builder. Second, Maine makes up for that with consumer contract law: the Home Construction Contracts Act requires a written contract for any home construction or repair work over $3,000. So your paperwork carries more weight here than a license card would.

Licensed trades still exist. Electricians, plumbers and oil, solid fuel, propane and natural gas technicians all answer to state boards. If you also take jobs in New Hampshire, note that state's different tax setup; Maine even refunds its sales tax on materials you install there (more below). For a contrast, West Virginia taxes repair labor outright.

Does Maine charge sales tax on contractor labor?

Usually not on construction contracts. Maine Revenue Services' Instructional Bulletin No. 4 (last revised December 22, 2025) says a contractor performing a construction contract is the last user of the materials as tangible personal property, so it pays sales or use tax when buying them. Title passes to the customer only once the materials become real property. In MRS's carpenter example, the contractor pays tax on materials and "does not add sales tax to the lump-sum charge to the customer." The same goes for an electrician who bills time and materials without adding tax and isn't registered as a retailer.

There's a second route. MRS says title can pass to the customer before installation. A written agreement is preferred, but a business practice of invoicing all customers for time, materials and sales tax is enough evidence. In that case you register as a retailer, buy materials tax-free on a resale certificate, and charge tax on the materials' sale price. Pick one approach and use it consistently.

The general rate under 36 M.R.S. § 1811 is 5.5% on tangible personal property and taxable services. One 2026 change: fabrication services, where a customer supplies materials and you produce an item that's handed over as personal property, became subject to sales tax on January 1, 2026; before that, MRS says they fell under the service provider tax. For how other states handle this, see sales tax on labor vs. materials.

How do Maine contractors handle tax on materials and tools?

• Tools and equipment: trucks, scaffolding, machinery, tools and consumable supplies are taxable to you, even on a job for an exempt organization.
• Exempt customers: materials permanently built into real property for the federal or state government, a Maine municipality, or an organization holding an MRS exemption certificate can be bought tax-free with Form ST-A-119 (Contractor's Exempt Purchase Certificate), one per project.
• Refunds: some situations use a refund instead of an exemption, filed on Form APP-153, such as tax paid on exempt repair parts for manufacturing equipment.
• Out-of-state jobs: MRS refunds Maine sales tax on goods built into real property in a jurisdiction with no sales or use tax. Its example: cabinets installed in a New Hampshire house qualify; the same job in Massachusetts doesn't.
• Untaxed purchases: if a seller doesn't charge Maine tax, you report use tax directly to MRS. Registered retailers report it as "Other Taxable Purchases" on their sales and use tax return.

Gravel is its own case. MRS says dumping or truck-spreading loam or aggregate is a taxable sale, but grading and compacting it into a driveway makes it real property, so you pay tax on your purchase and don't charge the customer. Read more on use tax for contractors.

Which trades need a state license in Maine?

Maine regulates specific trades through boards within the Office of Professional and Occupational Regulation (OPOR), not builders as a group.

Local rules fill the gap. The AG says any municipality with more than 4,000 residents must enforce the Maine Uniform Building and Energy Code (MUBEC) for new construction and additions, so permits and inspections come from the town. Smaller towns may have their own ordinances. And for any home job over $3,000, your written contract must include the items listed in 10 M.R.S. § 1487, such as the total price, start and completion dates, a work description, a warranty statement and the AG's consumer addendum. More: contractor license.

What are Maine's income tax rates for contractors?

Business profit from a sole proprietorship, partnership, LLC or S corp generally lands on the owners' Maine returns. Maine indexes its brackets each year. MRS's 2026 rate schedule for single filers:

New for 2026, MRS adds a 2% surcharge on Maine taxable income over $1,000,000 for single filers ($1,500,000 joint or head of household). We didn't find an elective pass-through entity tax on MRS's 2026 forms, so ask a CPA how your entity choice plays out in Maine.

Estimated payments. Form 1040ES-ME says you generally must pay estimated tax if your Maine tax after withholding and credits is $1,000 or more and last year's liability was also $1,000 or more. The 2026 due dates are April 15, June 15 and September 15, 2026, and January 15, 2027. Use quarterly estimated taxes for contractors and the quarterly estimated tax calculator to plan.

Do Maine contractors need workers' comp?

Yes, once you hire. Under 39-A M.R.S. § 401, every private employer, including an independent contractor who hires and pays employees, is subject to the Act; the exemptions are narrow (domestic service and some agricultural labor). The Bureau of Insurance's employer guide says:

• A sole proprietor without employees isn't required to have coverage and doesn't need a waiver form. Add an employee and you need coverage for that person.
• LLC owners aren't required to be covered and don't need waiver forms.
• A bona fide owner of at least 20% of a corporation's voting stock may waive benefits in writing.
• Failing to carry required coverage can bring a civil penalty of up to $10,000 or 108% of the premium that should have been paid, whichever is larger.

Hiring subs? The Workers' Compensation Board says that since October 25, 2023, an individual can file an Independent Contractor Statement (Form WCB-267) to create a rebuttable presumption of independent contractor status; the Board no longer approves predetermination applications. See workers' compensation.