Short answer
They can. Your bill is your assessed value times the town's tax rate, and the rate is set again each fall. New Hampshire towns must reappraise every property at least once every five years (RSA 75:8-a), and assessors review assessments every year, so your assessment can change too.
How is my property tax bill figured?
Your bill is your home's assessed value multiplied by the town's tax rate per $1,000. The NH Department of Revenue Administration sets each town's rate in the fall, after the town, school and county budgets are final; see when NH sets 2026 tax rates.
How often are NH homes reassessed?
State law (RSA 75:8-a) requires every town to reappraise all real estate at least once every five years so assessments reflect full and true value. A revaluation can raise or lower your assessment, and the town's rate usually moves the other way when values rise across town, since the rate is based on the total value.
Can my assessment change between revaluations?
Yes. Under RSA 75:8, assessors adjust assessments each year to keep them in proportion, and they consider properties with a physical change, a change in ownership, a zoning change, a subdivision or other changes that affect value. Adding a garage or finishing a basement can raise your assessment.
How does a tax change affect my mortgage payment?
If your taxes are paid through escrow, your servicer pays the bill and reviews the account once a year. A higher bill can mean a shortage and a higher payment; a lower one can mean a lower payment. The tax bills and escrow guide explains how.
What can I do if my assessment seems too high?
You can apply to the town for an abatement by its deadline, and some owners qualify for credits or exemptions. See NH property tax relief. Before you buy, check the town's rate on its town page.
Sources
- NH RSA 75:8-a, Assessments (reappraisal at least every five years)
- NH RSA 75:8, Revised inventory (annual adjustments)
Checked October 27, 2026. Rules and dates change, so confirm current details before you rely on them.
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