Commercial & Business Property
New Hampshire Commercial Property Tax Appeals
Office, retail, industrial, multifamily, and special-purpose buildings in New Hampshire are frequently over-assessed. Here's how commercial assessments work, the deadline to challenge yours, and what it takes to win.
How commercial is assessed
New Hampshire has no sales or income tax, so property tax rates are high and commercial value accuracy is critical. Municipalities assess at (or adjusted toward) market value.
Burden of proof
The property owner (or their authorized agent) bears the burden of proving the assessment exceeds market value. The assessor's value is presumed correct until rebutted with credible evidence.
Key to a New Hampshire commercial appeal: High rates magnify every dollar
With property tax as the primary revenue source, NH's elevated rates mean a value cut yields large dollar savings. Abate to the municipality first, then the Board of Tax and Land Appeals or Superior Court.
New Hampshire Filing Deadline & Where to File
File With
Local Board of Tax and Land Appeals (BTLA) or Superior Court
Deadline
March 1 following final tax bill (or September 1 for spring bills)
Window Opens
After final tax bill (usually December)
Typical Duration
3–12 months
No sales tax or income tax — property tax is primary revenue source. High rates statewide. Abatement application to selectmen/assessors first, then BTLA.
How commercial value is proven
Income-producing commercial property is usually valued by capitalizing net operating income (NOI ÷ market cap rate). The strongest appeals come with a clean rent roll, a trailing-12-month operating statement, current vacancy, and market cap-rate support. Where the property is owner-occupied or special-purpose, the cost and sales-comparison approaches carry more weight.
Evidence that wins a commercial appeal
- Current rent roll and a trailing-12-month operating statement
- Actual vacancy and collection loss (vs the assessor's stabilized assumption)
- Market capitalization rate support for the property type and submarket
- Recent arm's-length sales of comparable commercial buildings
- Evidence of physical, functional, or economic obsolescence
- Any change in use, tenancy, or condition since the assessment date
How to appeal a commercial assessment in New Hampshire
- 1Pull the assessment — confirm the assessed value, the assessment ratio/class, and how the assessor derived it (income, cost, or sales).
- 2Build the valuation — capitalize actual net operating income and gather comparable sales to establish market value as of the assessment date.
- 3File before the deadline — submit to Local Board of Tax and Land Appeals (BTLA) or Superior Court by March 1 following final tax bill (or September 1 for spring bills), with the authorization signed by someone able to bind the owning entity.
- 4Present at the hearing — commercial hearings are evidence-driven; a clean income approach and credible comps carry the day.
Think your New Hampshire commercial property is over-assessed?
We pull the assessment, build the income-approach case, and file the appeal. Fee: 20% of first-year savings — only if we win. Nothing upfront, and the reduction can hold for years.
Related resources
Assessment ratios, class rates, and deadlines in New Hampshire are set by statute and can change year to year, and often vary by county or municipality. Verify current figures and dates with your county assessor or clerk of the board before filing. This page is general information, not legal or tax advice. TaxedFairly is a product of WebLab LLC.