New Hampshire LLC Name Rules: How to Name Your Business

Filing fee: [STATE_FEE]

Processing time: [PROCESSING_TIME]

State agency: New Hampshire Secretary of State, Corporations Division

Annual report due: [STATE_FEE]

State tax rate: No state income tax on wages; business profits tax applies to certain entities

Naming a New Hampshire LLC comes down to 4 core requirements: your name must include an approved LLC designator, it must be distinguishable from every other registered or reserved business name on file with the New Hampshire Secretary of State, it can't use restricted professional or government terms without authorization, and it must be filed on your Certificate of Formation.

General naming rules for a New Hampshire LLC

Every New Hampshire LLC name must end with an approved designator that signals limited liability company status. Accepted options are "Limited Liability Company," "LLC," or "L.L.C." — all 3 are valid on your Certificate of Formation. You can include or omit a comma before the designator, so both "Granite Peak LLC" and "Granite Peak, LLC" are acceptable.

Beyond the suffix, your name must be distinguishable from every other business name already on file with the New Hampshire Secretary of State — not just identical names, but names that are confusingly similar. The Corporations Division can reject a name even when an online search suggests it's available, if the proposed name differs only slightly from an existing one.

Your name also can't imply a connection to a government agency or use words that suggest a purpose your LLC isn't authorized to carry out. Those restrictions are covered in the restricted terms section below.

How to search for an available New Hampshire LLC name

Run your name through the New Hampshire Secretary of State's NH QuickStart business entity search before you file anything. The database lets you search by business name, business ID, filing number, or registered agent, and supports filters including Starts With, Exact Match, Contains, and All Words.

Search results show the business name, business ID, entity type, status, home state, and any previous names — all details you need to judge whether an existing name could conflict with yours. Don't stop at an exact-match search. Run a "Contains" search on your most distinctive word to catch names that are close but not identical.

A clean search result is a good sign, but it's not a guarantee. The Corporations Division makes the final call on distinguishability when you file.

Restricted and prohibited terms in New Hampshire LLC names

Some words require state authorization before you can use them in your LLC name. Using them without approval means your filing will be rejected — or worse, you could face regulatory action after the fact.

• Insurance: requires compliance with New Hampshire Insurance Department rules
• Engineer or engineering: requires registration with the New Hampshire Joint Board for Licensure and Certification and licensed professionals on staff
• Architect or architecture: requires compliance with state architectural licensing requirements and licensed architects associated with the practice
• CPA or certified public accountant: requires meeting New Hampshire Board of Accountancy licensing and registration requirements
• Physician, surgeon, or medical doctor: requires organization as a professional entity with appropriately licensed principals

If your business operates in one of these fields, talk to a legal professional before filing to confirm what authorization you need.

How to reserve a New Hampshire LLC name

New Hampshire lets you reserve an LLC name for 120 days before you're ready to file your Certificate of Formation. Reserving a name holds it against other filers while you get your paperwork together — it doesn't form the LLC.

The New Hampshire Department of State's Corporations Division handles name reservations. Check name availability through the NH QuickStart portal first, since the same distinguishability rules that apply to formation also apply at the reservation stage — a name that conflicts with an existing entity can't be reserved.

Processing takes several business days after the Department of State receives your reservation filing. Plan ahead if you're working toward a specific formation date.

How to register a trade name (DBA) in New Hampshire

If you want to run your business under a name that's different from your LLC's legal name, New Hampshire requires you to register that name as a trade name — what most people call a DBA. Trade names in New Hampshire are governed by RSA Chapter 349.

You register a trade name by filing an Application for Registration of Trade Name with the New Hampshire Secretary of State, Corporations Division. Your proposed trade name must be distinguishable from existing business and trade names already on file — the same availability check you'd run for an LLC name applies here too.

A trade name registration doesn't create a new legal entity. Your LLC remains the legal entity behind the name — the trade name is just what the public sees.

Trademarks and your New Hampshire LLC name

State registration doesn't protect you from trademark conflicts. A name can clear the New Hampshire Secretary of State's database and still infringe on a federally registered trademark — and that's a problem that can force a costly rebrand after you've already built brand recognition.

Before you commit to a name, search the USPTO's trademark database at the U.S. Patent and Trademark Office website. Look for registered marks that are identical or confusingly similar to your proposed name in your industry. If you find a conflict, pick a different name before you file.

If your name is clear, consider filing for federal trademark protection once your business is up and running. State registration alone doesn't give you exclusive rights to the name nationwide.