Sullivan County, NH follows the New Hampshire statutory schedule. This page shows that schedule, the county's own website, and the late penalty — the county can still set its own dates, so confirm before you pay.
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…until annual bill — December 2, 2026
Instalment
Due date
Notes
Annual bill
December 2, 2026
Interest starts on taxes unpaid after December 1 following assessment.
First half
July 2, 2027
Towns that adopt RSA 76:15-a also collect a July 1 partial payment, with the balance due December 1.
Schedule: gc.nh.gov · New Hampshire statute · not yet county-verified
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Statewide schedule — read this before you rely on it
Municipalities choose annual billing (December 1), semiannual billing (July 1 and December 1) or quarterly billing (July 1, October 1, January 2 and March 31), so coupon dates genuinely differ by town. Variation between counties here is high — treat the dates above as a starting point only.
Unpaid tax bears interest at 8% per annum from the delinquency date, and the town may place a tax lien on the property.
The collector must mail bills within 30 days of receiving the tax list, so most bills arrive in the fall ahead of the December 1 due date.
Sullivan County at a glance
Population: 43,969 (Census estimate, 2023) — the 9th largest of 10 New Hampshire counties and county equivalents.
Typical tax bill: $5,554 a year (median for owner-occupied homes, ACS 2022 5-year estimate) — the New Hampshire median is $6,372.
Land area: 537.9 sq mi, about 81.7 people per sq mi.
By post: mail to the county treasurer; the postmark usually counts, not the arrival date.
In person: the treasurer's office, with your bill or parcel number.
Escrow: if your mortgage escrows taxes, the servicer pays — you still owe any shortfall.
Is this county verified?
Not yet. Sullivan County is on the queue: we publish a county's own published dates once they have been checked against the county website. Ask for it and it moves up. Until then, the New Hampshire statutory schedule above is the reliable starting point.
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StacyApproved is an independent reference and is not a government agency. Deadlines change and exceptions apply — always confirm with your county treasurer using the official link on this page. Nothing here is tax, legal or financial advice.