How to Appeal Your Property Tax in New Hampshire: Step-by-Step Guide for 2026

A New Hampshire property tax appeal begins as an abatement request to your own town or city. State statute sets the deadlines, and they count from the “date of notice of tax.” If that date is on or before December 31, file with the selectmen or assessors by March 1 (RSA 76:16). If it is after December 31, file within 2 months of it (RSA 76:16-d, II). If they deny the request or don’t answer, you can appeal to the Board of Tax and Land Appeals or to superior court, but not both. The appeal deadline is September 1, or 8 months after the notice of tax when that date is after December 31 (RSA 76:16-a, 76:17, 76:16-d, II).

The abatement calendar in RSA 76

Every deadline counts from the “date of notice of tax.” RSA 76:1-a defines that as the date the Board of Tax and Land Appeals (BTLA) determines to be the last mailing date of the final tax bill. Which bill is final depends on how your municipality bills (RSA 76:1-a, I). A town that bills once a year counts from that bill, and a town that bills twice a year under RSA 76:15-a counts from the second one. A town on an optional fiscal year counts from the first bill, provided that bill sets the whole year’s tax and tells you abatements must be sought from it. A municipality that bills quarterly counts from the bill due January 2. The table shows both versions of the calendar: one for a final bill mailed by December 31, and one for a bill mailed later.

RSA 76:16, 76:16-a and 76:17 were last amended in 2014 (2014, 175:1–3, effective September 9, 2014), and the BTLA’s property tax page printed the same calendar as of mid-2025. The BTLA, not your bill, fixes the notice-of-tax date: it sets the date from the mailing date your town reports and keeps a list of those dates (Tax 301.05(b)). Ask your assessing office, or the BTLA at (603) 271-2578, which date the board set for your town. If the town sends amended bills to all taxpayers, the board sets a new date. If it sends you an amended bill that raises your tax, your own notice-of-tax date becomes the date that amended bill was sent (Tax 301.05(c)). In an unincorporated town or unorganized place, the abatement application goes to the county commissioners instead of selectmen or assessors (RSA 81:5).

What counts as filed on time

For the town application and a BTLA appeal, BTLA rule Tax 102.26 treats a document as filed on the date it is hand delivered and received, postmarked by the U.S. Postal Service, or marked as receipted by a courier such as FedEx or UPS. RSA 76:16-e applies this mailing rule to filings with a municipality or the BTLA only. RSA 80:55 puts the risk of a missing or unreadable postmark on the sender. A postage-meter stamp is not proof of mailing. The BTLA now warns that under USPS Domestic Mail Manual § 608.11, mail may not be postmarked until processed. It suggests a counter receipt or Certified Mail when you are close to a deadline. For the same two filings, when a period’s last day is a Saturday, Sunday, legal holiday or a day the filing office is closed, Tax 201.03(a) does not count that day as the last day. That rollover stops at the courthouse door. The BTLA’s appeal form says it applies “for appeals to the BTLA only and not the superior court,” so don’t count on it for a superior court petition. The postmark rule is not a court rule either, so make sure the superior court receives your petition by the deadline.

Filing too early is also a defect. Tax 203.04(b) treats an application as untimely if it is filed “on or before the notice of tax date.” A late municipal application ends the case: the BTLA “shall dismiss appeals when the abatement application was not timely filed with the municipality” (Tax 203.04(c)). The only exception, in Tax 203.04(d), requires you to show all four of these: the town gave you the wrong filing deadline, you did not know the correct one, the town should have known you would rely on what it told you, and you did rely on it to your detriment, such as by missing the deadline.

The municipal application: form, signature, specifics

The BTLA prescribes the form: the Taxpayer’s RSA 76:16 Abatement Application to Municipality, revised June 2023 (Tax 203.02(b)). You can file a letter that contains the same items, and RSA 76:16, IV says failing to use the form “shall not affect the right to seek tax relief.” A town may charge a fee to cover the cost of the form (RSA 76:16, I(b)). Three requirements trip people up:

• You sign it yourself. Under Tax 203.02(d), an attorney or agent cannot sign in place of the owner. A missing owner signature blocks a BTLA appeal unless it was due to reasonable cause and not willful neglect.
• Give reasons, not conclusions. Tax 203.02(c) says “Conclusory statements without supporting arguments or data shall be insufficient.”
• List all your property in the town. The form asks for every parcel you own there, because the whole estate is considered when deciding whether you are disproportionately assessed.

RSA 76:16, I(b) also limits relief to a person “who has complied with the requirements of RSA 74.” That is the annual inventory chapter. If your town mails you an inventory blank, return it.

Proving disproportion rather than a high bill

The taxpayer carries the burden of “proving the assessment was disproportionate or illegal, resulting in the taxpayer paying a disproportionate share of taxes” (Tax 203.09(a), citing Appeal of Town of Sunapee, 126 N.H. 214 (1985)). The standard is a preponderance of the evidence (Tax 201.27(f)). Tax 203.03(e) names three kinds of proof:

1. physical data, such as an incorrect description or measurement of the property;
2. market data for the property’s value on the April 1 assessment date, supported by comparable sales or a professional opinion of value;
3. assessment data showing that the property’s assessment, compared with its market value, exceeds the town’s general level of assessment.

The BTLA form explains the test. Divide your assessment by your municipality’s equalization ratio to get the “equalized assessment,” then show that this figure exceeds your property’s market value. The Department of Revenue Administration publishes the median ratios. Since April 1, 2025, RSA 76:16-f works the math in the other direction for any abatement that finds a market value. That value is multiplied by the prior year’s median ratio, except in a full reassessment year, when it is equalized at 100 percent.

BTLA or superior court

You pick one. The BTLA’s page describes the path as an appeal “with BTLA (or the superior court, but not both).” To use the board, mail or hand deliver its appeal form to the BTLA at Johnson Hall, 107 Pleasant Street, Concord, with a $65 check or money order payable to “Treasurer, State of NH.” The board does not accept electronic filings. The appeal must state your opinion of market value and the comparables you rely on (Tax 203.03(b)). The grounds in the appeal document, not the town application, control the issues (Tax 203.03(g)). If you had already paid the taxes and the BTLA abates because of a clerical error or a plain and clear error of fact, and not of interpretation, the town treasurer reimburses the $65 (RSA 76:17-b).

New Hampshire abatement questions

My town never answered. Do I wait?

No. If the notice of tax was on or before December 31, the town’s silence by July 1 is a denial (RSA 76:16, II). If it was after December 31, the town’s decision is due within 6 months of the notice of tax (RSA 76:16-d, II). A town’s failure to respond “shall not extend the deadlines” for appealing (Tax 203.02(f)). Your appeal deadline still runs: September 1, or 8 months after the notice of tax if that date was after December 31.

Do I keep paying the bill while I contest it?

Yes. The BTLA’s application form says it “does not stay the collection of taxes; taxes should be paid as assessed.” If taxes were paid and an abatement is granted, RSA 76:17-a adds interest at 4 percent a year from payment to refund (rate set by 2022, 164:1, effective April 1, 2022).

If I win, do I have to file again next year?

Not to keep the corrected value. After a BTLA or court abatement, RSA 76:17-c requires the town to use the corrected value for later years until a good-faith reappraisal of the property or a general reassessment. The town must also abate later years’ taxes assessed on the wrong value while the appeal was pending. You must file again for a later year if you want to raise issues or arguments not stated in the original appeal, appeal a parcel you did not appeal before, or if the assessment you appealed has changed significantly for a good-faith reason or adjustment. That list is not exhaustive (Tax 203.05(h), (m)).

A revaluation just raised my assessment. Is that appealable?

Yes. Use the same abatement application for the year of the new bill. The deadline is March 1, or 2 months after the notice of tax if the final bill went out after December 31 (RSA 76:16; 76:16-d, II). RSA 75:8-a requires every municipality to reappraise at least every fifth year. Since July 1, 2026, a municipality doing that reappraisal must give public notice of the changes in assessed value at least 45 days before it issues the final tax bill (RSA 75:8-c). In a full reassessment year, a market value found in an abatement is equalized at 100 percent (RSA 76:16-f).

Can hardship support an abatement even if the value is right?

RSA 76:16 lets officials abate “for good cause shown.” The form’s instructions say good cause “can also be established by showing poverty and inability to pay the tax.” That is a separate ground from disproportion, and it follows the same deadlines.

More on New Hampshire and nearby states

• New Hampshire property tax explained: rates and exemptions
• Property tax calculator
• Buying a home in New Hampshire
• New Hampshire vs Vermont
• Grieving a Vermont appraisal
• Maine property tax and abatement
• Massachusetts abatement appeals
• Grieving an assessment in New York

Primary sources: RSA 76:16, RSA 76:16-a, RSA 76:16-d; BTLA rules Tax 100–500; BTLA property tax page.