New York property tax answers · Updated June 2026
How do I protest my property taxes in Nassau County?
The short answer
Nassau County does not use the statewide Grievance Day. You file with the county's own Assessment Review Commission (ARC), online, by its deadline, which typically falls in spring (often early March). Submit 3 to 5 comparable properties assessed lower than yours, since the county's reassessment created exactly those disparities. If ARC denies you, you can escalate to a Small Claims Assessment Review in Nassau County Supreme Court for a modest fee.
Nassau's own process, step by step
- Look up your property on the Nassau County Assessment Review Commission (ARC) site and note your assessed value. Compare it to similar homes on your street or in your neighborhood.
- File your grievance online through the ARC portal by its deadline. Nassau's date is set by the county and typically falls in spring, often around early March, and it moves year to year, so confirm the current date before you rely on it.
- Attach 3 to 5 comparable properties, similar square footage, lot, age, and condition, that are assessed lower than yours. The county's reassessment created wide disparities, so unequal-assessment arguments are unusually strong here.
- ARC reviews and may offer a reduction. If it denies you, file for Small Claims Assessment Review (SCAR) in Nassau County Supreme Court within the statutory window, for a modest filing fee.
Why Nassau is a strong place to grieve
Nassau's reassessment swung many assessments in ways that did not track each home's value relative to its neighbors, which is precisely the gap an unequal-assessment grievance exploits. Long Island also carries some of the highest effective rates in the country, so even a single-digit percentage reduction is real money that carries forward until the next reassessment.
The broader New York picture, and your own county's data, is on our New York page. The mechanics of the statewide process (for everywhere except NYC and Nassau) are in how to grieve in New York.
Bring data, not grievances
ARC and SCAR both respond to comparables, not to how high your bill feels. The free check compares your assessment to similar properties in about 30 seconds, no signup, so you walk in knowing whether you have a case and how big. If you do, the $49 protest kit comes with the comparable table pre-filled and ready to sign and submit, and you keep every dollar of the savings.
See if your home is over-assessed, free
Search your address and see how your assessment compares against similar properties from the public assessment roll. Free, no signup, about 30 seconds. If the record shows a gap, the $49 protest kit comes pre-filled with your comparable evidence and the filing steps for your jurisdiction, you sign and submit, and you keep 100% of the savings. No contingency, ever.
Check my address · FreeFlat $49, one time. Filing your own appeal is free in every state; what you're buying is the evidence and the steps, done.