Can a sole proprietorship become an LLC in New Hampshire?

Yes. A sole proprietorship is not a legal entity separate from its owner, so you convert by forming a new New Hampshire LLC and moving the business into it. File a Certificate of Formation with the New Hampshire Secretary of State and pay the $100 filing fee. On the EIN, the IRS says a single-member LLC can keep using your sole proprietor EIN if it does not choose corporate or S-Corporation tax treatment, has no employees and owes no excise tax; otherwise it needs its own EIN, which you apply for on Form SS-4. Update your business licenses, bank accounts and contracts so they name the LLC, and check whether any state tax registrations must be reissued in the LLC's name. Forming the LLC gives you limited liability protection that a sole proprietorship lacks. File your Certificate of Formation with the New Hampshire Secretary of State to get started.

Does an LLC reduce self-employment tax in New Hampshire?

No, forming a New Hampshire LLC doesn't by itself reduce self-employment tax. By default, a single-member LLC is taxed like a sole proprietorship and a multi-member LLC like a partnership, and the owners generally owe 15.3% self-employment tax on net self-employment earnings. Self-employment tax is a federal tax paid to the IRS, not to the New Hampshire Department of Revenue Administration: it is 12.4% for Social Security, which applies only up to an annual earnings cap, plus 2.9% for Medicare. However, an eligible LLC can file Form 2553 (Election by a Small Business Corporation) with the IRS to be taxed as an S-Corporation. You then pay yourself a reasonable salary, which is subject to Social Security and Medicare payroll taxes, and take remaining profits as distributions, which are not. The trade-off: an S-Corporation must run payroll, file payroll tax returns and a separate federal return (Form 1120-S), and pay for the accounting that requires. An S election does not change the New Hampshire picture: New Hampshire taxes an S corporation itself under the Business Profits Tax and Business Enterprise Tax. Whether the tax savings exceed those costs depends on your profits. Next step: consult a New Hampshire CPA to model the savings based on your projected income before filing Form 2553.

How much does it cost to form an LLC in New Hampshire?

The New Hampshire Secretary of State charges a flat $100 to file a Certificate of Formation (RSA 304-C:191). If a paper filing is accepted, the Secretary of State says you will receive a filed-stamped copy within 30 days. Starting the year after the LLC forms, it files a $100 annual report between January 1 and April 1 each year, though an LLC formed in December skips the report in the year that follows. Missing April 1 adds a $50 late fee, making the report $150. New Hampshire's larger cost can be tax rather than filing fees: the 7.5% Business Profits Tax applies once gross business income exceeds $109,000, and the 0.55% Business Enterprise Tax once gross receipts or the enterprise value tax base exceed $298,000. Every New Hampshire LLC must name a registered agent, and the Secretary of State's instructions say an application will not be processed without one. If you use a paid formation service, Northwest Registered Agent charges $39 plus state fees with a year of registered agent service included (then $125 a year), and ZenBusiness charges $0 plus state fees, with registered agent service at $99 for the first year when you form with them (then $199 a year). File your Certificate of Formation with the New Hampshire Secretary of State to get started.

Does an LLC protect personal assets in New Hampshire?

Yes. Under RSA 304-C:23, I, the debts, obligations and liabilities of a New Hampshire LLC, whether arising in contract, tort or otherwise, are solely the LLC's, and no member or manager is obligated personally for them solely by reason of being a member or acting as a manager. That protection has limits: paragraph II lets a member or manager agree, in an operating agreement or another agreement, to be personally liable, which is what a personal guarantee does. Keeping a separate business bank account and never mixing personal and business funds are still sensible practices, because courts can in some cases disregard an LLC and reach its owners ("piercing the veil"), and commingled funds invite that argument. If a creditor wins a judgment against your LLC for a company obligation you did not guarantee, it generally collects from the LLC's assets, not your personal home and savings. To secure this protection, file your Certificate of Formation with the New Hampshire Secretary of State and open a dedicated business bank account from day one.

Can one person own an LLC in New Hampshire?

Yes. RSA 304-C:20 says a New Hampshire LLC "must have at least one member but may have any greater number of members," so one person can own and control an LLC and also manage it. For federal tax purposes, the IRS treats a single-member LLC as a disregarded entity by default, so the LLC's income is reported on your personal return, just as with a sole proprietorship. An eligible LLC can instead elect S-Corporation tax treatment by filing Form 2553 with the IRS, which can reduce self-employment taxes on profits taken as distributions. The practical benefit: you gain personal liability protection for business debts while keeping tax filing simple. New Hampshire's filing fee is $100 for the Certificate of Formation, and the LLC files a $100 annual report by April 1 each year. Next step: file your Certificate of Formation with the New Hampshire Secretary of State, then open a business bank account to keep business and personal finances separate. The IRS says a single-member LLC with no employees, no excise tax and no corporate tax election can use your sole proprietor EIN instead of getting a new one.

Is a sole proprietorship legal without registration in New Hampshire?

Yes, sole proprietorships don't require state registration in New Hampshire. You become a sole proprietor the moment you start doing business, with no formation filing with the New Hampshire Secretary of State. There are still caveats. If you do business under any name other than your own name, RSA 349:1 requires you, as a sole proprietor, to register the trade name. Also note that New Hampshire's Business Profits Tax reaches a proprietorship with gross business income above the filing threshold, so staying a sole proprietor does not avoid it. Check with your city or county whether your type of business needs a local license, since local requirements and fees vary, and certain professions need a state license from their licensing board. The practical implication: while you avoid LLC filing fees, you remain personally liable for all business debts and legal judgments, unlike an LLC owner. Your next step: contact your city or county to confirm licensing requirements and fees for your specific business type and location.

LLC Guide

New Hampshire LLC vs Sole Proprietorship: Complete 2026 Comparison

Discover the key differences between forming an LLC and staying a sole proprietor in New Hampshire, including costs, taxes, and liability protection.

Last updated: September 2026

In New Hampshire, an LLC fits when you have personal assets to protect from business liabilities; a sole proprietorship fits when you're testing a business idea with minimal startup costs. Compare both structures in detail below.

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Comparison chart for New Hampshire LLC versus Sole Proprietorship, contrasting liability, taxation and ongoing filing burden across 8 factors. — Side-by-side on the factors that decide the choice, for New Hampshire. Source: New Hampshire Secretary of State.

LLC vs Sole Proprietorship: Side-by-Side

Factor	LLC	Sole Proprietorship
Personal liability protection	Limited liability: members are not personally liable for the LLC's debts and obligations solely because they are members	No protection: you're personally liable for all business debts and legal claims
Formation cost & paperwork	$100 New Hampshire filing fee for a Certificate of Formation with the Secretary of State	No state formation filing required, just start doing business
Taxation	Pass-through by default (no double taxation), with the option to elect corporate or S-Corporation tax treatment	Pass-through only: all business income is reported on your personal return (Schedule C)
Self-employment tax	15.3% self-employment tax on net self-employment earnings by default (Social Security part capped yearly); an S-Corp election may reduce it at higher profits	15.3% self-employment tax on net self-employment earnings, with the Social Security part capped each year; a sole proprietorship cannot elect S-Corp status
Business credibility	Professional appearance with 'LLC' designation helps with customers, vendors, and lenders	May appear less established: operates under your personal name or a trade name
Banking & contracts	Separate business bank account recommended to keep LLC and personal funds apart; easier to get business credit cards and loans	Can use personal accounts, though a separate account makes business records and taxes easier to track
State fees in New Hampshire	$100 to form, then a $100 annual report due by April 1 each year ($150 if late)	$0 in state formation fees; a trade name registration is required if you do business under a name other than your own
Conversion path to LLC	Already an LLC: can elect different tax treatments as the business grows	You can form a New Hampshire LLC later by filing a Certificate of Formation with the Secretary of State

When an LLC Makes More Sense

You have personal assets to protect from business liabilities
Your profits are high enough that an S-Corp election's federal self-employment tax savings would outweigh the added payroll and accounting costs
You want to build business credit separate from your personal credit
You plan to have business partners or investors in the future

When a Sole Proprietorship Makes More Sense

You're testing a business idea with minimal startup costs
Your business has low liability risk
You want to avoid the $100 filing fee and the $100 annual report
Your income is modest and you want maximum tax simplicity

Tax Deep Dive

Sole Prop Tax

Sole proprietorships report business income on Schedule C of your personal federal return. You pay regular income tax plus 15.3% self-employment tax on net self-employment earnings, with the 12.4% Social Security part applying only up to an annual earnings cap, and a sole proprietorship cannot elect S-Corporation tax treatment. New Hampshire does not tax wages, and its Interest and Dividends Tax was repealed for taxable periods beginning after December 31, 2024. But New Hampshire's Business Profits Tax is not limited to corporations: RSA 77-A:1 defines a taxable business organization to include a proprietorship, so a sole proprietorship with gross business income above the filing threshold ($109,000 for taxable periods beginning on or after January 1, 2025) is subject to the 7.5% tax on its taxable business profits too.

Llc Default Tax

By default, a single-member LLC is a 'disregarded entity' for federal tax purposes, taxed like a sole proprietorship, and a multi-member LLC is taxed as a partnership. Either way, you generally still owe self-employment tax on net self-employment earnings, but an LLC can elect a different tax treatment as your business grows. New Hampshire taxes an LLC at the entity level whatever its federal classification: an LLC with gross business income above $109,000 owes the 7.5% Business Profits Tax, and one with gross receipts or an enterprise value tax base above $298,000 owes the 0.55% Business Enterprise Tax.

Llc S Corp Election

New Hampshire LLCs can elect S-Corporation tax status with the IRS to split income into a reasonable salary (subject to Social Security and Medicare payroll taxes) and distributions (not subject to those taxes). An S election does not change the New Hampshire picture: New Hampshire taxes an S corporation itself under the Business Profits Tax and Business Enterprise Tax. Whether it saves money depends on your profits and the added payroll and accounting costs, so have a CPA model it before electing.

This guide is general information, not legal or tax advice, and reading it does not create an attorney-client relationship. It reports published tax rates and statutory attributes, with the sources this page cites. It cannot tell you which structure is better for you: that turns on your profit, the salary you could defend as reasonable compensation, every state you owe tax in, and plans for owners, investors and exit that no figure on this page measures. Confirm your own position with a CPA or tax attorney licensed in your state before you elect anything, because some elections are slow or costly to reverse.

Frequently Asked Questions

: Yes. A sole proprietorship is not a legal entity separate from its owner, so you convert by forming a new New Hampshire LLC and moving the business into it. File a Certificate of Formation with the New Hampshire Secretary of State and pay the $100 filing fee. On the EIN, the IRS says a single-member LLC can keep using your sole proprietor EIN if it does not choose corporate or S-Corporation tax treatment, has no employees and owes no excise tax; otherwise it needs its own EIN, which you apply for on Form SS-4. Update your business licenses, bank accounts and contracts so they name the LLC, and check whether any state tax registrations must be reissued in the LLC's name. Forming the LLC gives you limited liability protection that a sole proprietorship lacks. File your Certificate of Formation with the New Hampshire Secretary of State to get started.
: No, forming a New Hampshire LLC doesn't by itself reduce self-employment tax. By default, a single-member LLC is taxed like a sole proprietorship and a multi-member LLC like a partnership, and the owners generally owe 15.3% self-employment tax on net self-employment earnings. Self-employment tax is a federal tax paid to the IRS, not to the New Hampshire Department of Revenue Administration: it is 12.4% for Social Security, which applies only up to an annual earnings cap, plus 2.9% for Medicare. However, an eligible LLC can file Form 2553 (Election by a Small Business Corporation) with the IRS to be taxed as an S-Corporation. You then pay yourself a reasonable salary, which is subject to Social Security and Medicare payroll taxes, and take remaining profits as distributions, which are not. The trade-off: an S-Corporation must run payroll, file payroll tax returns and a separate federal return (Form 1120-S), and pay for the accounting that requires. An S election does not change the New Hampshire picture: New Hampshire taxes an S corporation itself under the Business Profits Tax and Business Enterprise Tax. Whether the tax savings exceed those costs depends on your profits. Next step: consult a New Hampshire CPA to model the savings based on your projected income before filing Form 2553.
: The New Hampshire Secretary of State charges a flat $100 to file a Certificate of Formation (RSA 304-C:191). If a paper filing is accepted, the Secretary of State says you will receive a filed-stamped copy within 30 days. Starting the year after the LLC forms, it files a $100 annual report between January 1 and April 1 each year, though an LLC formed in December skips the report in the year that follows. Missing April 1 adds a $50 late fee, making the report $150. New Hampshire's larger cost can be tax rather than filing fees: the 7.5% Business Profits Tax applies once gross business income exceeds $109,000, and the 0.55% Business Enterprise Tax once gross receipts or the enterprise value tax base exceed $298,000. Every New Hampshire LLC must name a registered agent, and the Secretary of State's instructions say an application will not be processed without one. If you use a paid formation service, Northwest Registered Agent charges $39 plus state fees with a year of registered agent service included (then $125 a year), and ZenBusiness charges $0 plus state fees, with registered agent service at $99 for the first year when you form with them (then $199 a year). File your Certificate of Formation with the New Hampshire Secretary of State to get started.
: Yes. Under RSA 304-C:23, I, the debts, obligations and liabilities of a New Hampshire LLC, whether arising in contract, tort or otherwise, are solely the LLC's, and no member or manager is obligated personally for them solely by reason of being a member or acting as a manager. That protection has limits: paragraph II lets a member or manager agree, in an operating agreement or another agreement, to be personally liable, which is what a personal guarantee does. Keeping a separate business bank account and never mixing personal and business funds are still sensible practices, because courts can in some cases disregard an LLC and reach its owners ("piercing the veil"), and commingled funds invite that argument. If a creditor wins a judgment against your LLC for a company obligation you did not guarantee, it generally collects from the LLC's assets, not your personal home and savings. To secure this protection, file your Certificate of Formation with the New Hampshire Secretary of State and open a dedicated business bank account from day one.
: Yes. RSA 304-C:20 says a New Hampshire LLC "must have at least one member but may have any greater number of members," so one person can own and control an LLC and also manage it. For federal tax purposes, the IRS treats a single-member LLC as a disregarded entity by default, so the LLC's income is reported on your personal return, just as with a sole proprietorship. An eligible LLC can instead elect S-Corporation tax treatment by filing Form 2553 with the IRS, which can reduce self-employment taxes on profits taken as distributions. The practical benefit: you gain personal liability protection for business debts while keeping tax filing simple. New Hampshire's filing fee is $100 for the Certificate of Formation, and the LLC files a $100 annual report by April 1 each year. Next step: file your Certificate of Formation with the New Hampshire Secretary of State, then open a business bank account to keep business and personal finances separate. The IRS says a single-member LLC with no employees, no excise tax and no corporate tax election can use your sole proprietor EIN instead of getting a new one.
: Yes, sole proprietorships don't require state registration in New Hampshire. You become a sole proprietor the moment you start doing business, with no formation filing with the New Hampshire Secretary of State. There are still caveats. If you do business under any name other than your own name, RSA 349:1 requires you, as a sole proprietor, to register the trade name. Also note that New Hampshire's Business Profits Tax reaches a proprietorship with gross business income above the filing threshold, so staying a sole proprietor does not avoid it. Check with your city or county whether your type of business needs a local license, since local requirements and fees vary, and certain professions need a state license from their licensing board. The practical implication: while you avoid LLC filing fees, you remain personally liable for all business debts and legal judgments, unlike an LLC owner. Your next step: contact your city or county to confirm licensing requirements and fees for your specific business type and location.

Sources

Each entry below is a document recorded in our verified New Hampshire sources, and each entry says what the document is. Some statutory text is read from an accurate mirror rather than from the state's own host, and those say so.

sos.nh.gov/corporations-0New Hampshire Secretary of State: business entity filings
gc.nh.gov/rsa/html/XXVIII/304-C/304-C-191.htmNew Hampshire LLC filing fees

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