Key takeaways
- The state treats an S corporation like a regular corporation: the return is Form NH-1120, built from the federal Form 1120-S.
- Two taxes can apply: the business profits tax at 7.5 percent and the business enterprise tax at 0.55 percent.
- For a calendar-year S corporation the state return is due April 15, 2027, a month after the federal return.
- Filing thresholds are set by statute and indexed, so check the current NH-1120 instructions for the exact dollar figure.
- Collect NH-specific payroll, property and sales data in addition to the federal package.
How New Hampshire treats an S corporation
The state's administrative rule on S corporations (Rev 302.01) says an S corporation is treated the same as a corporation that files as a regular corporation for the business profits tax. The computation starts from federal Form 1120-S, then applies the state adjustments for items such as rents, interest, dividends, royalties and capital gains.
So the usual pass-through habit of handing each shareholder a K-1 and letting them sort it out does not end the New Hampshire analysis. The entity files its own state return and pays its own tax. The shareholders still get Schedule K-1 (Form 1120-S) for the federal return, but a New Hampshire entity-level liability exists before any distribution.
The two taxes and the rates for 2026
The business profits tax rate in RSA 77-A:2 is 7.5 percent for periods ending on or after December 31, 2023. The statute steps down from 7.7 percent in 2019 to 7.6 percent in 2022 and 7.5 percent in 2023, and it contains no lower rate after that. A tax year 2026 return therefore uses 7.5 percent, unless a later law changes it, which is worth a quick check when you open the 2026 forms.
The business enterprise tax in RSA 77-E:2 is 0.55 percent of the enterprise value tax base, the rate for periods ending on or after December 31, 2022. That base is roughly compensation paid, interest paid and dividends paid, so a payroll-heavy S corporation with thin profit can owe more business enterprise tax than profits tax.
Worked example, tax year 2026: an S corporation with $200,000 of taxable business profits owes $15,000 of profits tax at 7.5 percent. If its enterprise value tax base is $1,000,000, the enterprise tax is $5,500 at 0.55 percent. The two are computed separately, and the enterprise tax is generally creditable against the profits tax with limits, so build the credit on the NH-1120 schedule rather than from memory.
Who has to file
Under RSA 77-A:6 a business organization must file a profits tax return when its gross business income exceeds $92,000. The statute indexes that amount every two years, beginning with tax years starting January 1, 2023, so the figure on the current NH-1120 instructions is higher than $92,000. Pull the instructions for the exact number rather than quoting the statute figure to a client.
Gross business income here is defined in RSA 77-A:1 as all income for federal income tax purposes from whatever source derived in the conduct of business, with no deduction for costs. A restaurant S corporation can clear the threshold at a loss. A return is also required for any period in which the entity realizes a gain or loss on the sale of an interest, whatever its income.
The enterprise tax has its own test in RSA 77-E:5: gross business receipts, or an enterprise value tax base, above $250,000 through December 31, 2026. The statute raises that to $400,000 starting January 1, 2027, again indexed every two years. Which figure applies to a given period depends on the period dates, so read the form year for the return you are preparing.
Decision rule: if the client is an S corporation with any New Hampshire activity, a New Hampshire office, employees, property or sales, assume a return is needed until the gross income and base figures say otherwise. Run the test for each tax separately. An entity can be under the profits tax threshold and over the enterprise tax threshold.
Due dates, estimates and extensions
RSA 77-A:6 sets the due date for business organizations other than partnerships and exempt organizations at the fifteenth day of the fourth month after the period ends. For a calendar-year S corporation that is April 15. For tax year 2026 that is April 15, 2027. The federal Form 1120-S is due a month earlier, on March 15, 2027, a Monday.
Estimated payments are due on the 15th day of the fourth, sixth, ninth and twelfth months of the taxable period under Rev 307.02, so a calendar-year client pays four times a year. RSA 77-A:6 says no declaration of estimated tax is needed when the estimated tax is under $200. RSA 77-E:6 describes the enterprise tax estimates as four equal 25 percent installments.
On extensions, the federal one is clear: Form 7004 gives an automatic 6-month extension of time to file. The state sets its own rules, and the DRA ties its extension to paying the tax by the original due date. We could not open the current DRA extension instructions while preparing this page, so confirm the length and any state form on the current business tax instructions before telling a client they are covered.
Nonresident shareholders, composite returns and PTE tax
New Hampshire does not tax individuals on wages, and the entity pays at the entity level, so the NH-1120 does not turn on shareholder residency the way a multistate pass-through return does. We found nothing in the statutes we reviewed that creates an elective pass-through entity tax, a composite return or nonresident shareholder withholding for S corporations here, but we could not confirm the absence on the DRA site, so check before promising a client there is none.
The state that does care is the shareholder's home state. A Massachusetts or Maine resident who owns a New Hampshire S corporation reports the K-1 income on a home-state return, usually with a credit question for the New Hampshire entity tax. Ask the client where each shareholder lives on December 31 and whether any shareholder works from another state.
Reported by news coverage and DRA statements, the old Interest and Dividends Tax on shareholder-level interest and dividends was repealed for periods beginning after 2024, so it should not appear on tax year 2026 shareholder returns. Verify with the current DRA guidance if a client's prior preparer still lists it.
Documents to collect from the client
Ask for the federal package first: the filed or draft Form 1120-S with Schedules K, K-1, L, M-1 and M-2, depreciation detail, the Form 7004 if one was filed and the Form 2553 acceptance letter. The NH-1120 cannot be started without it. Ask also for the prior-year NH-1120 so that carryforwards, credits and apportionment history are visible.
Then the New Hampshire items that the federal return never shows: payroll by state and by work location, interest paid and dividends or distributions paid for the enterprise value tax base, real and tangible property used in New Hampshire, sales by destination, and a list of every estimated payment made with dates and amounts. Without the payment list the balance due is a guess.
Ask for any sale, redemption or transfer of an ownership interest during the year, since a gain or loss on one triggers a filing. Request it by name. Clients rarely volunteer a buy-out as a tax event.
Send the request as a short file-upload list, not an email with attachments, and keep Social Security numbers out of the message body. Usual can hold this as a recurring annual request with reminders, so the New Hampshire items are asked for each year without a rewrite.