Housing & Real Estate Reviewed July 2026
How to appeal your NYC property tax assessment
If you think the city over-assessed your building, there is a real, free, first-stop appeal before you ever see a courtroom, and the whole window is open for only a few weeks each winter.
The numbers that matter
- Who hears it
- The NYC Tax Commission, an independent body of a president plus six commissioners appointed by the mayor (NYC Charter § 153, 2021 edition, read July 2026)
- The four grounds
- That the assessment is excessive, unequal, or unlawful, or that the property is misclassified (NYC Charter § 163, 2021 edition, read July 2026)
- The filing window
- Class 1 homes: January 15 to March 15. Class 2, 3, and 4 property: on or before March 1 (NYC Charter §§ 163-164-b, 2021 edition, read July 2026)
- Decision deadline
- The Tax Commission's final determination is due no later than May 25 (NYC Charter § 165, 2021 edition, read July 2026)
The Tax Commission is your first stop
The Department of Finance sets your assessment. A different body reviews it, and knowing the two are separate is the whole trick to appealing. The Charter creates the reviewer and hands it one job.
The tax commission shall be charged with the duty of reviewing and correcting all assessments of real property made pursuant to the provisions of section fifteen hundred six.
Finance assesses; the Tax Commission corrects. It sits in the Office of Administrative Tax Appeals, deliberately walled off from the assessors whose work it second-guesses.
You cannot appeal just because your tax bill went up. You have to fit one of a short list of legal grounds, and the Charter spells them out.
The grounds for review of an assessment shall be that the assessment complained of is excessive, unequal, or unlawful, or that the real property is misclassified.
Four doors in, in plain English: excessive (assessed above market value), unequal (assessed at a higher ratio than comparable property), unlawful (taxing something exempt or outside the city), or misclassified (in the wrong tax class). Most homeowner cases walk through excessive or unequal.
The window is short, and it moves by tax class
This is where people lose before they start. The appeal window opens in the dead of winter and closes fast, and the date depends on what kind of property you own.
any party claiming to be aggrieved by the assessed valuation of a parcel designated class one pursuant to the provisions of article eighteen of the real property tax law may apply for correction of such assessment from the fifteenth day of January until the fifteenth day of March
Class 1 is most one-, two-, and three-family homes, and it gets the longest runway: mid-January to mid-March. For class 2, 3, and 4 property the books close earlier, on the first of March, so a co-op or rental owner has even less slack.
And the assessment roll itself is open only for a set stretch, which is the outer limit on when a challenge can even be filed.
The books of the annual record of the assessed valuation of real estate shall be opened to the public not later than the fifteenth day of January in each year, not a Saturday, Sunday or legal holiday, and remain open during the usual business hours for public inspection and examination until the first day of March thereafter.
Mid-January to the first of March: the same rhythm the whole appeal calendar hangs on. Miss it and you wait a full year for the next roll.
What the Commission can do, and when you'll hear back
The Commission can lower your assessment or leave it, and it is on a clock of its own.
The final determination of the tax commission upon any application for the correction of an assessment shall be rendered not later than the twenty-fifth day of May.
If the Commission blows the deadline, the Charter treats the original assessment as its final answer, which is your cue to go to the next level.
If the Commission's offer is not enough, the next stop is court, through a tax-certiorari proceeding or, for a house, Small Claims Assessment Review, but that is a separate track with its own filing. The Tax Commission stage is the free one, and it is where most corrections actually happen.
None of this changes how the bill is built in the first place. For that machinery, the classes, the caps, and the assessment ratios, read how NYC property taxes work.
The questions New Yorkers actually ask
How do I appeal my NYC property taxes?
File an application for correction with the New York City Tax Commission during the winter window: for class 1 homes, January 15 to March 15; for class 2, 3, and 4 property, on or before March 1. You must claim one of four grounds: excessive, unequal, or unlawful assessment, or misclassification.
What does it cost to challenge my assessment?
Filing an application for correction with the Tax Commission is free. Only if you go on to court, through tax certiorari or Small Claims Assessment Review, do filing fees and, usually, a lawyer come in.
What are the grounds to challenge a property assessment?
By Section 163 of the City Charter, that the assessment is excessive, unequal, or unlawful, or that the property is misclassified. A rising tax bill by itself is not a ground.
When will the Tax Commission decide my case?
No later than May 25, by Section 165. If it does not decide by then, the original assessment stands as the final determination, which lets you take the case to court.
The documents
The public records this page draws on. Read them yourself:
Now watch the machinery move.
These pages explain how the city works on paper. The morning brief is how it worked today: what changed, what it means for your rent, your commute, and your block, in plain language.
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