How to Register a Contracting Company in Maine

Step one: pick the structure, because it decides which offices you visit

Maine's Secretary of State lists five entity types that file with the state: business corporation, nonprofit corporation, limited liability company, limited partnership and limited liability partnership. It also states that sole proprietorships and general partnerships are not filed with that office. That single fact does most of the work in deciding your registration path. A sole proprietor contractor in Maine has no state entity filing at all, and their only name-related filing is municipal.

For most contracting companies the choice is between operating as a sole proprietor and forming an LLC, described by the Secretary of State as combining corporate liability protection with partnership flexibility for the distribution of profit and loss. This page does not tell you which to pick, because that is a tax and liability question for your own accountant and lawyer against your own numbers. What it can tell you is what each one costs to file and what it commits you to afterwards.

Note that neither choice affects your licensing position. Maine does not licence general contractors, so forming an LLC does not "register you as a contractor" and does not entitle you to describe yourself as state registered for construction purposes. It registers a business entity, nothing more.

Official sources: Maine Secretary of State: Types of Businesses; Maine Attorney General: Home Construction and Repair

Step two: clear the name, then file it in the right place

Before you print anything, run the name against the Secretary of State's corporate name search, which covers entities on file with the state. If you want to hold a name before you are ready to file, form MLLC-1 reserves an LLC name for $20.00.

If you are forming an LLC, the Certificate of Formation is form MLLC-6 and the fee published on the Secretary of State's own LLC forms page is $175.00. Budget the calendar as well as the money: the same page states that "Corporate filings processing time is 40 - 55 business days". If your first job depends on a business bank account in the entity's name, start this months before you think you need to. An out-of-state company qualifying to do business in Maine files a Statement of Foreign Qualification, form MLLC-12, at $250.00.

If you stay a sole proprietor and trade under anything other than your own name, the filing is with your town. The Secretary of State quotes the statute directly: a sole proprietor who intends "to adopt any business name, style or designation other than his own name exclusively" shall, "before commencing business, deposit in the office of the clerk of the city or town in which such business is to be carried on a certificate", signed and sworn, giving the proprietor's name and residence, the business name and a statement that the person is the sole proprietor. The authority cited is Title 31, chapter 1, section 2. We do not print a fee for this because no statewide schedule is published; call your clerk.

Official sources: Maine Secretary of State: Corporate Name Search; Maine Secretary of State: Limited Liability Company Forms; Maine Secretary of State: Trade Name Protection

Step three: register for tax, and set your filing frequency deliberately

Maine Revenue Services runs new business registration through the Maine Tax Portal. Its FAQ states that businesses making "regular sales of tangible personal property or taxable services" must register for a sales tax account. Maine's general sales and use tax rate is 5.5 percent and the service provider tax is 6 percent.

Filing frequency follows liability. Maine Revenue Services states that "Generally, every retailer with an average tax liability of $600 or more per month must file a monthly tax return", with quarterly, semi-annual and annual options for lower liability, and that returns "are due no later than the 15th of the month" after the reporting period. On the published schedule, monthly and seasonal filers report the following month, quarterly filers in April, July, October and January, semi-annual filers in July and January, and annual filers in January.

Whether you need a sales tax account at all depends on how you contract, and this is the decision to make deliberately rather than by accident. Instructional Bulletin No. 4 sets the default: a contractor performing a construction contract is "the last user of the materials as tangible personal property" and "pays a sales or use tax when purchasing the materials", adding no tax to a lump-sum customer charge. A contractor working that way is not making retail sales and may not need a retailer certificate. But the bulletin also describes the alternative, where title passes before installation, and states that "the contractor's business practice of invoicing all customers for time, materials, and sales tax, is sufficient evidence to support the intent that title passes to the customer before affixing the materials to real property". That contractor registers as a retailer, buys on a resale certificate and bills the customer tax on materials.

You can also become a retailer without meaning to. Section 5 of the bulletin states that a contractor is a retailer when it "Purchases and sells materials and supplies at retail" or "Builds and sells tangible personal property at retail, such as cabinets, furniture, and other items, without incorporating them into real property". It gives a worked aggregate example too: dumping eight yards of loam at $10 a yard with a $25 delivery fee is a taxable retail sale on the full $105, while delivering the same material and then grading and compacting it is affixing it to real property, with no tax charged to the customer and the tax owed on your own purchase instead.

Official sources: Maine Revenue Services: Sales, Use and Service Provider Tax; Maine Revenue Services: Sales, Use and Service Provider Tax FAQ; Maine Revenue Services: Sales and Use Tax Rates and Due Dates; Maine Revenue Services Instructional Bulletin No. 4: Contractors and Subcontractors

Step four: the registrations that only start once you hire

Workers' compensation is the first one and the one with real teeth. 39-A M.R.S. section 401 provides that "Every private employer, including an independent contractor who hires and pays employees, is subject to this Act", and requires that employer to secure payment of compensation by insuring or self-insuring. The statute's exemptions cover domestic service and certain seasonal agricultural and aquacultural labour, not construction.

Whether a person on your job is an employee is decided by a checklist, not by what your invoice calls them. Maine's Workers' Compensation Board explains that under 39-A M.R.S. section 102(13-A) the person must be "free from the essential direction and control of the employing unit, both under the person's contract of service and in fact", must meet all five of the first-group criteria, and must meet at least three of the seven in the second group. The first group includes the essential right to control the means and progress of work, being customarily engaged in an independently established trade, opportunity for profit and loss, hiring and supervising assistants, and making services available to the customer community. The Board also notes that predeterminations issued before October 25, 2023 remain valid for a year and that the older forms are no longer accepted.

Then register with the Department of Labor for unemployment insurance, through the ReEmployME system or the Employer Registration Form. The Department states that unemployment tax is paid "on the first $12,000 only in gross wages an employer pays to an individual in a calendar year", reported on the UC-1 Quarterly Unemployment Contributions Report. The employer page does not publish the quarterly deadlines, so take those from the portal or the form rather than from any summary, including this one.

Official sources: 39-A M.R.S. section 401 (security for compensation); Maine Workers' Compensation Board: Independent Contractor FAQ; Maine Department of Labor: Unemployment Insurance for Employers

Step five: the local layer, and the calendar you keep afterwards

Maine.gov states that "Construction permits and inspections, including electrical and plumbing, are managed at the town level in Maine", and points new businesses at Business Answers, its online Business Licensing Assistant, which "will lead you through a series of questions about the type of business you are trying to start, and provide a list of licenses, permits or qualifications you need", plus a searchable directory by keyword, category or agency. Run it for your actual trade and town rather than assuming general construction needs nothing.

Remember that the building code binds you regardless of the town. The Division of Building Codes and Standards states that municipalities over 4,000 population must enforce the Maine Uniform Building and Energy Code, smaller ones may choose to, and "compliance with the MUBEC is mandatory and the responsibility of the owner, regardless of whether a building is located in a municipality that enforces the MUBEC". Your own contract warranty under 10 M.R.S. section 1487 promises code compliance in writing, so this is a contractual exposure as well as a regulatory one.

Once everything is filed, the ongoing calendar for a registered Maine contracting company is short but unforgiving: the annual report by June 1 at $85 domestic or $150 foreign, sales and use tax returns by the 15th at your assigned frequency, quarterly unemployment reports once you have staff, workers' compensation coverage maintained continuously, and renewal of any trade licence held by you or your qualifying staff on its own two-year cycle. Missing the annual report is the one that escalates fastest, because non-payment of the late penalty leads to administrative dissolution of the entity you just paid $175 to create.

Official sources: Maine.gov: Starting a Business in Maine; Maine Office of Community Affairs: Division of Building Codes and Standards; 10 M.R.S. section 1487 (home construction contracts); Maine Secretary of State: Filing Requirement Reminders; Maine Revenue Services: Sales and Use Tax Rates and Due Dates; Maine Professional and Financial Regulation: Licensee Search

Check the official page yourself before you file or sign

Maine spreads contractor rules across at least six places: the Attorney General for the home construction contract rules, the Secretary of State for the entity, Maine Revenue Services for sales and use tax, the Office of Professional and Occupational Regulation for the licensed trades, the Workers' Compensation Board for coverage, and your own town clerk and code office for assumed names and permits. No single page carries all of it.

The licensing landscape is also genuinely unsettled. LD 1226 got as far as a divided committee report before it died on adjournment on April 29, 2026, and a bill that nearly passed once tends to come back. Before you sign a contract or file anything, open the specific official page for your question, confirm the figure, and keep a dated copy of what you read. Maine.gov states that "Construction permits and inspections, including electrical and plumbing, are managed at the town level in Maine", so your town office is the last call, not the first thing to skip.

Official sources: Maine Legislature: LD 1226 Text and Status, 132nd Legislature; Maine.gov: Starting a Business in Maine