Nassau County, New York · Mineola
Nassau County property tax appeal guide
Nassau uses its own Assessment Review Commission with an earlier deadline (typically spring) — NOT the statewide Grievance Day. File online with ARC. You appeal through the Nassau County Assessment Review Commission (ARC); New York uses Form RP-524 (Complaint on Real Property Assessment) filed with the Board of Assessment Review (BAR).
Nassau County appeal deadline
Grievance Day — in most of the state the fourth Tuesday in May, but it varies by municipality.
Outside New York City and Nassau County, you file Form RP-524 on your municipality's Grievance Day, commonly the fourth Tuesday in May — but towns set their own dates. New York City (NYC Tax Commission) and Nassau County (Assessment Review Commission) run entirely separate systems with earlier deadlines. Always confirm with your local assessor.
How to appeal in Nassau County
1. Check your tentative assessment roll
Most towns publish a tentative assessment roll on May 1. Compare your assessment to recent sales of similar homes and to your municipality's residential assessment ratio.
2. File Form RP-524 by Grievance Day
File the Complaint on Real Property Assessment (Form RP-524) with your Board of Assessment Review by Grievance Day — commonly the fourth Tuesday in May, but confirm your municipality's date. There is no filing fee.
3. Board of Assessment Review
The BAR reviews your complaint and may reduce your assessment. Bring comparable sales and, if relevant, evidence of an above-ratio assessment.
4. Small Claims Assessment Review (optional)
If the BAR denies relief, owner-occupants of a one-, two-, or three-family home can file for Small Claims Assessment Review (SCAR) within 30 days of the final roll for a modest court filing fee.
5. NYC and Nassau are different
New York City files with the NYC Tax Commission (around March), and Nassau County files with the Assessment Review Commission (deadline typically in spring) — both separate from the statewide Grievance Day process.
Nassau County property tax FAQ
What is the property tax appeal deadline in Nassau County, New York?
Grievance Day — in most of the state the fourth Tuesday in May, but it varies by municipality. Outside New York City and Nassau County, you file Form RP-524 on your municipality's Grievance Day, commonly the fourth Tuesday in May — but towns set their own dates. New York City (NYC Tax Commission) and Nassau County (Assessment Review Commission) run entirely separate systems with earlier deadlines. Always confirm with your local assessor.
What form do I use to appeal in Nassau County?
New York uses Form RP-524 (Complaint on Real Property Assessment), filed with the Board of Assessment Review (BAR). There is no filing fee to appeal.
When is Grievance Day in New York?
In most of the state, the fourth Tuesday in May — but each municipality sets its own date, so confirm with your local assessor. New York City and Nassau County use separate, earlier deadlines.
Other New York counties
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