Sole Proprietorship in New Hampshire: How to Start One

A New Hampshire sole proprietorship is the simplest way to legally run a business in the state. There is no formation filing with the Secretary of State, no annual report, and no franchise tax that applies specifically to this structure. That simplicity is exactly why it is the default choice for freelancers, consultants, tradespeople, and small local retailers who want to start earning money without wading through paperwork.

This guide walks through what a sole proprietorship actually is under New Hampshire law, what you need before you start, and the specific steps to set one up correctly, including when you need to register a trade name, when you owe state business taxes, and which licenses actually apply to you.

This article is informational only and is not legal or tax advice. New Hampshire's rules can change, and your specific situation (industry, revenue, location) may require steps not covered here. Talk to a New Hampshire attorney or CPA before making structural or tax decisions for your business.

What Is a Sole Proprietorship in New Hampshire?

A sole proprietorship is an unincorporated business owned and run by one person, where there is no legal separation between the owner and the business. If you start doing business under your own legal name and haven't filed anything with the state to create an LLC or corporation, you are already operating as a sole proprietor under New Hampshire law.

The tradeoff for that simplicity is liability. There is no legal shield between your personal assets and your business debts or lawsuits. If the business is sued or can't pay a debt, your personal bank account, car, and other property are exposed. This is the single biggest reason business owners eventually convert to an LLC (formed with a Certificate of Formation for a $100 filing fee through NH QuickStart) once revenue or risk increases.

What You Need Before You Start

A business name, either your own legal name or a trade name ("doing business as" name) you plan to register
A Social Security Number or EIN for tax filing purposes
$52 to $102 for trade name registration, if you're using one (see Step 2)
A New Hampshire business address (home office is fine for most businesses)
Any industry-specific license or certification your profession or trade requires
A separate bank account for business income and expenses (highly recommended, not legally required)

Step-by-Step: How to Start a Sole Proprietorship in New Hampshire

Step 1: Decide on Your Business Name

If you plan to operate under your own legal name, for example "Sarah Mitchell Photography" where Sarah Mitchell is your actual name, you don't need to register anything with the state to use that name. The moment you start doing business this way, you're a sole proprietor.

If you want to operate under any other name, such as "Granite State Photography" or "White Mountain Consulting," New Hampshire law requires you to register that name as a trade name. Before you commit to a name, search the NH QuickStart business name database to confirm no one else is already using it. This isn't a legal requirement for a sole proprietorship the way it is for an LLC, but operating under a name that's confusingly close to an existing registered business invites trademark and customer-confusion problems down the road.

Step 2: Register a Trade Name (If You're Using One)

Under RSA 349, anyone conducting business under a name other than their own legal name must register a trade name with the New Hampshire Secretary of State, Corporation Division. This is filed on Form TN-1.

The cost is $50 to register, plus a $2 electronic handling charge if you file online through NH QuickStart. Registration must be renewed for another $50 (changes to the trade name information itself, like a new address, are free to update). This filing is done at the state level; New Hampshire does not register trade names at the county level.

Skipping this step when you're required to file is a common mistake. It generally will not stop you from opening a bank account or invoicing clients in the short term, but it can complicate things if you ever need to enforce a contract in court under that business name, or if a bank or client asks for proof of registration.

Step 3: Get an EIN From the IRS

A sole proprietor with no employees can generally use their Social Security Number for tax purposes and isn't required to get an Employer Identification Number (EIN). That said, most business owners get one anyway, and for good reason: banks typically require an EIN to open a business checking account, and using an EIN instead of your SSN on invoices and vendor forms reduces how often you have to hand out your Social Security Number.

You'll need an EIN regardless if you plan to hire employees, or if your business structure changes later. The IRS issues EINs for free, and the application takes a few minutes online.

Step 4: Understand New Hampshire's Tax Picture

This is where New Hampshire genuinely stands out. The state has no personal income tax, so your sole proprietorship's profits, which pass through to your personal return, are not taxed at the state level the way they would be in most other states.

However, two business-level taxes can still apply depending on your revenue, both administered by the New Hampshire Department of Revenue Administration:

Business Profits Tax (BPT): 7.5% for taxable periods ending on or after December 31, 2023. This only applies to business organizations with more than $109,000 of gross business income. Many small, early-stage sole proprietorships fall under this threshold and owe no BPT.
Business Enterprise Tax (BET): 0.55%, and it only applies to enterprises with more than $298,000 of gross receipts or an enterprise value tax base over $298,000. If you owe both, BET paid is a credit against your BPT liability, so you're not paying both in full.

New Hampshire also has no general state sales tax, so unlike most states, you generally don't need to register for a sales tax permit just to sell taxable goods. Confirm your specific situation with the DRA or a CPA, since thresholds and exceptions can shift, and this is exactly the kind of detail that changes with new legislation.

Step 5: Check for Industry-Specific Licenses and Local Permits

New Hampshire has no general statewide business license requirement, so as a sole proprietor you likely won't need a blanket state license just to open your doors. But several categories of business do need specific state or local approval:

Regulated trades and professions (contractors, cosmetologists, real estate agents, and dozens of others) need a license from the Office of Professional Licensure and Certification
Anyone operating a hotel, offering sleeping accommodations, selling taxable meals, or renting motor vehicles needs a Meals and Rooms (Rentals) Operator's License under RSA 78-A:4, applied for through the Granite Tax Connect portal
Food service businesses need a health license from the Department of Health and Human Services
Your city or town clerk may require local permits, such as a home occupation permit, zoning approval, or a local business registration, depending on where you operate

Check with your specific city or town clerk's office early. This is one of the most commonly skipped steps because it isn't centralized at the state level, and local permit requirements vary a lot between somewhere like Manchester or Nashua and a smaller town.

Step 6: Open a Business Bank Account

New Hampshire law doesn't require a sole proprietor to keep a separate bank account, but mixing personal and business funds is one of the most common mistakes new owners make. It muddies your bookkeeping, makes tax time harder, and weakens any argument that your business is a real, separate operation if you're ever audited or sued. Bring your trade name registration (if applicable) and EIN to the bank when you open the account.

Step 7: Get Business Insurance

Because a sole proprietorship offers no liability protection, insurance is doing a lot of the work that an LLC's legal structure would otherwise do. At minimum, most sole proprietors should look into general liability insurance, and professionals in fields like consulting, coaching, or design should consider professional liability (errors and omissions) coverage. If you have even one employee, New Hampshire requires workers' compensation insurance.

Step 8: Keep Up With Ongoing Requirements

Unlike an LLC or corporation, a sole proprietorship has no annual report to file with the Secretary of State and no $100 annual fee. Your main ongoing obligations are renewing your trade name registration every few years if you have one, filing your federal and any applicable state business taxes on time, and keeping any professional or local licenses current.

Common Mistakes to Avoid

Assuming you need to "register" your sole proprietorship with the state. If you're using your own legal name, there's nothing to file. Many new owners waste time looking for a formation filing that doesn't exist for this structure.
Operating under a trade name without registering it. If your business name isn't your own legal name, Form TN-1 is not optional under RSA 349.
Ignoring the liability exposure. Sole proprietorships offer no separation between you and the business. If that risk matters to your industry, budget for the $100 LLC filing fee sooner rather than later.
Forgetting local permits. The absence of a state license doesn't mean the absence of a local one. Check with your town or city clerk.
Not tracking the BPT and BET thresholds. Growing past $109,000 in gross business income or $298,000 in gross receipts changes your tax obligations. Track this rather than finding out at filing time.

What You Can Expect

Following these steps, a straightforward New Hampshire sole proprietorship using the owner's own legal name can typically be up and running the same day, since there is no state filing to wait on. If you're registering a trade name, expect that filing to be processed according to the Corporation Division's current posted turnaround time on the NH QuickStart login page; in-person filing in the Concord office can be expedited for an additional $25 if you need it faster. Actual timelines and outcomes may vary based on your specific business type, location, and how quickly local permitting offices respond, so treat these as general expectations rather than guarantees.

Where to Get Help

For free, hands-on guidance specific to your business plan, the New Hampshire Small Business Development Center and the SBA's New Hampshire district office both offer no-cost consulting for new business owners. For anything involving liability exposure, contracts, or tax elections beyond the basics covered here, consult a licensed New Hampshire attorney or CPA before you commit to a structure or start invoicing clients.