State Guide
How to Appeal Your Property Taxes in New York (2026 Guide)
If you own a home in New York, your town, city, or village assessor sets its value, and that number drives your tax bill. Every year you have a window to challenge it — but New York works differently from most states in two ways: there's no single statewide assessment ratio, and the deadline (Grievance Day) depends on where you live.
The New York deadline: Grievance Day
In most towns, the Board of Assessment Review meets on the fourth Tuesday in May — the day commonly called Grievance Day — under Real Property Tax Law §512. You file a complaint with that board on or before that date, on the state's prescribed form, Form RP-524 (§524).
But the date is not uniform statewide: cities and villages often set their own grievance dates, and New York City (through the NYC Tax Commission) and Nassau County (through its Assessment Review Commission) run entirely separate calendars with earlier winter/spring deadlines. The one reliable source is your assessment notice — read it for your assessing unit's exact Grievance Day. If the Board of Assessment Review doesn't lower your value, the next rung for most homeowners is a Small Claims Assessment Review (SCAR) petition or an Article 7 court proceeding.
How New York assesses your home
Here's the part that trips up most New York owners: the state does not use one assessment ratio. Each assessing unit sets its own level of assessment — some assess at 100% of market value, many at a fraction of it. That means the number on your notice may not be your home's market value, and you can't just compare it to recent sale prices directly.
To translate, New York State publishes two tools for each area: the residential assessment ratio (RAR) and the equalization rate. Dividing your assessed value by the applicable ratio converts it to an implied market value you can then test against comparable sales. Look up your assessing unit's current ratio — don't assume a statewide figure, because there isn't one.
| Category | New York |
|---|---|
| Assessment basis | Set locally — each assessing unit picks its own level of assessment (use the RAR / equalization rate to convert) |
| Grievance deadline | Grievance Day — fourth Tuesday in May in most towns (§512); NYC and Nassau differ — check your notice |
| Where you file | Board of Assessment Review, via Form RP-524 |
| Assessment cap | No single statewide cap (New York City runs its own class-based system) |
| Can the board raise your value? | No — it can lower or leave unchanged, not raise, on your grievance |
Building your case
Because the question is your home's market value (translated through your area's ratio), the winning evidence is recent, nearby comparable sales — homes like yours in size, age, and condition — not listing prices or online estimates. The strongest grievances show the board that your assessed value, converted to market value using the local ratio, is higher than what comparable homes actually sold for. Three or four solid comps with clear adjustments carry far more weight than a complaint that the number "feels high."
The reassuring part, specific to New York: on your own grievance, the Board of Assessment Review can lower your assessment or leave it unchanged — it can't raise it. That makes a well-supported grievance a genuinely low-risk filing, so it's worth doing whenever your comps point to a lower value.
Filing at the local level
New York runs assessments assessing-unit by assessing-unit — roughly a thousand towns, cities, and villages, each with its own assessor, level of assessment, and Grievance Day, plus the separate New York City and Nassau systems. We're building out local guides with the exact filing office, ratio, and deadline for each. In the meantime, use PROppeal to pull licensed comparable sales for your address and confirm your Grievance Day on your notice.
Get your case built
You don't need to wait on a local guide to start. PROppeal pulls licensed comparable sales for your address, helps you translate your assessed value to market value using your area's ratio, and gives you a straight answer on whether your assessment is out of line — before Grievance Day arrives.
Sources
- N.Y. Real Property Tax Law §512 — Board of Assessment Review meets on the fourth Tuesday in May (commonly called Grievance Day)
- N.Y. Real Property Tax Law §524 — complaint on a form prescribed by the commissioner (Form RP-524)
- N.Y. Real Property Tax Law §525 — board's determination may be the same as or less than the original assessment (cannot raise on your own complaint)
- N.Y. Dept. of Taxation & Finance — Equalization rates and the residential assessment ratio (RAR)
- N.Y. Dept. of Taxation & Finance — Contest your assessment (grievance procedures)
Property tax rules and deadlines vary by jurisdiction and can change — verify with your county before relying on this.
See if your New York assessment is too high
PROppeal checks your case against real, recent comparable sales and gives you an honest verdict — then builds the board-ready letter to file, all in one price.
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