Sole proprietorship vs S corp in New Hampshire: which costs less (2026)

At $100,000 profit in New Hampshire, a sole proprietorship costs $23,668 a year in tax and fees and an LLC taxed as an S corp costs $21,299. An LLC taxed as an S corp starts to cost less from about $67,500 of profit.

$2,369 a year

saved by switching from a sole proprietorship to an LLC taxed as an S corp in New Hampshire, at these numbers.

Switching from a sole proprietorship to an LLC taxed as an S corp starts to pay at about $67,500 of profit, with the same settings. Setting up costs $100 once in state filing fees.

New Hampshire, 2026: $100,000 profit, single filer

Item	Sole prop	LLC as S corp	Change
New Hampshire business profits tax (sole proprietors and LLCs)revenue.nh.gov, checked Oct 23, 2026	$1,875	$0	−$1,875
Self-employment taxirs.gov, 2026 rates	$13,865	$0	−$13,865
Federal income taxirs.gov, 2026 rates	$7,928	$8,884	+$956
Annual Reportquickstart.sos.nh.gov, checked Oct 23, 2026	$0	$100	+$100
Payroll tax on your salaryirs.gov, 2026 rates	$0	$6,400	+$6,400
Payroll service and tax return (estimate)	$0	$1,800	+$1,800
New Hampshire business profits tax (S corporations and LLCs taxed as S corps)revenue.nh.gov, checked Oct 23, 2026	$0	$4,115	+$4,115
Yearly cost	$23,668	$21,299	−$2,369

What these figures count

State income tax, and state taxes on the business itself: franchise, LLC, S corp, gross receipts and excise taxes.
Social Security and Medicare on both sides of an owner salary, federal unemployment tax and the state's new-employer rate.
The 20% qualified business income deduction with its income limits and the professional-service rule.
Yearly report fees, and a cost you can change for payroll and the business tax return.

Many S corp calculators leave out state taxes and the QBI deduction, which can make the election look better than it is.

Yearly cost at each profit level

Profit	Sole prop	LLC as S corp	Difference
$30,000	$5,181	$6,944	+$1,763
$50,000	$9,732	$10,740	+$1,008
$75,000	$15,495	$14,835	−$660
$100,000	$23,668	$21,299	−$2,369
$150,000	$41,518	$35,529	−$5,989
$200,000	$59,830	$50,575	−$9,255
$300,000	$99,950	$82,832	−$17,118

Federal and New Hampshire tax and fees, single filer, revenue 1.5 times profit, default salary for S and C corps. "Difference" is LLC taxed as an S corp minus Sole proprietorship.

What the switch takes in New Hampshire

File the Certificate of Formation (Form LLC-1) with the state: $100 (fee).
Get an EIN from the IRS (free, online) and open a business bank account in the new name.
Check the business can elect: no more than 100 shareholders, all of them US citizens or residents (no nonresident alien owners), and one class of stock. IRS
File IRS Form 2553 to elect S corp tax treatment, within 2 months and 15 days of the start of the tax year it should apply to. See how the S corp election works.
New Hampshire does not follow the S election: the state taxes the company as a corporation, which the figures above include.
Register with New Hampshire as an employer and run payroll for your own salary: federal Forms 941 each quarter, Form 940 and a W-2 each year. New employers pay New Hampshire unemployment tax at 1.7% on the first $14,000 of wages. nhes.nh.gov See what payroll costs.
Federal return each year: Form 1120-S, due March 15, plus your own Form 1040.
State upkeep each year: Annual Report, $100 a year, due April 1. New for you: New Hampshire business profits tax (S corporations and LLCs taxed as S corps).

What changes between the two

A sole proprietor pays self-employment tax of 15.3% on 92.35% of all profit, up to the Social Security wage base of $184,500. Taxed as an S corp, the business pays you a salary, and only the salary carries Social Security and Medicare tax. The rest comes out as a distribution.

The election adds costs: a payroll service, a separate business tax return (Form 1120-S), federal and New Hampshire unemployment tax on the salary, and New Hampshire business profits tax (S corporations and LLCs taxed as S corps). The calculator counts $1,800 a year for payroll and the return. The IRS expects a reasonable salary for the work, so it cannot be set near zero.

A sole proprietor cannot elect S corp status alone: forming an LLC first ($100 in New Hampshire) and electing on Form 2553 is the usual route.

Questions

At what profit does an S corp election pay in New Hampshire?

About $67,500 a year, on the default salary (40% of profit, at least $30,000 where profit allows) and $1,800 of yearly payroll and return costs. Change the salary in the calculator to see how the point moves.

How much does it save at $100,000 in New Hampshire?

$2,369 a year: Sole proprietorship $23,668, LLC taxed as an S corp $21,299.

Does New Hampshire recognise the S corp election?

No. New Hampshire taxes S corporations as corporations, and the calculator includes that.

More for New Hampshire

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