How to Start an LLC in Maine

Filing fee: $175 (Certificate of Formation, Form MLLC-6)

Processing time: 40–55 business days standard; next-business-day for $50 extra; same-day for $100 extra

State agency: Maine Secretary of State, Division of Corporations, UCC and Commissions

Annual report due: Annually; $85 filing fee

State tax rate: No state-level LLC franchise tax; Maine income tax applies to members on their share of LLC income

To start an LLC in Maine, you file Form MLLC-6 — the Certificate of Formation — with the Maine Secretary of State and pay a $175 state filing fee. Standard processing takes 40–55 business days. You'll also need a registered agent with a Maine street address, a business address, an Employer Identification Number (EIN), and a written operating agreement.

Why form an LLC in Maine

A Maine LLC gives you personal liability protection — meaning your personal finances are generally not on the hook for business debts or lawsuits — while keeping taxes and paperwork simpler than a corporation. Members report income on their personal returns, so the business itself doesn't pay a separate state income tax.

Maine also offers business incentives worth knowing about. The Maine Department of Economic and Community Development administers programs like the Small Enterprise Growth Fund, which provides patient capital investments — typically between $150,000 and $350,000 — to small businesses with high-growth potential. Forming an LLC first puts you in a position to pursue those opportunities.

Step 1: Choose a business name

Your LLC's name must be distinguishable from every other business entity already on file with the Maine Secretary of State — that includes corporations, other LLCs, and limited partnerships. It also needs to include "Limited Liability Company," "LLC," or "L.L.C." somewhere in the name.

Check availability using the Maine Secretary of State's online name search tool before you file. If you're not ready to file yet but want to lock in a name, you can reserve it for 120 days by filing Form MLLC-1 and paying a $20 fee.

Step 2: Provide a business address

Every Maine LLC needs a designated street address on file. It can be a home address, an office, or a location outside Maine — but it cannot be a P.O. Box. This address appears in your formation documents and is part of the public record.

Step 3: Assign a registered agent

Maine law requires every LLC to have and continuously maintain a registered agent in the state. The registered agent receives service of process, legal notices, and official state correspondence on behalf of your LLC. Their name and Maine street address go directly on your Certificate of Formation.

The registered agent must be available during normal business hours. You can serve as your own registered agent if you have a Maine street address, or you can use a registered agent service. Many business owners choose a service to keep their personal address off public filings.

Step 4: File your Certificate of Formation

Form MLLC-6 is the Certificate of Formation for a Maine LLC. It asks for your LLC name, your registered agent's name and street address, and whether the LLC will be member-managed or manager-managed. You'll also need to include a Customer Contact Cover Letter with your submission.

Maine does not accept LLC formation filings online. You'll need to mail or hand-deliver the completed form to the Maine Secretary of State, Division of Corporations, UCC and Commissions. The state filing fee is $175. Standard processing runs 40–55 business days — if that timeline doesn't work, expedited options are available for an extra $50 (next business day) or $100 (same day).

Step 5: Get an EIN

An Employer Identification Number (EIN) is a federal tax ID issued by the IRS. You'll need one to open a business bank account, file federal taxes, and hire employees. Single-member LLCs without employees can sometimes use a Social Security number instead, but an EIN keeps your personal number off business documents.

Apply for an EIN free at irs.gov. The online application gives you your EIN immediately after you complete it. If you'd rather not apply online, file IRS Form SS-4 by fax or mail instead.

Step 6: Create an operating agreement

Maine law requires every LLC to adopt a written operating agreement. It's an internal document — you don't file it with the state — but it's legally required and needs to be kept with your business records. Both single-member and multi-member LLCs need one.

The operating agreement covers how decisions get made, how ownership is divided among members, how profits and losses are distributed, and what happens if a member leaves. Getting this right at the start saves real headaches later — especially in a multi-member LLC where disagreements can get expensive.

Other Maine LLC types

If you work in a licensed profession — things like law, medicine, or accounting — you may need to form a Professional Limited Liability Company (PLLC) instead of a standard LLC. PLLCs follow the same basic formation process but carry additional licensing requirements tied to your specific field. Check with your state licensing board to confirm which entity type applies to your profession.