How Suffolk grievance differs from Nassau
Suffolk follows the standard NY State grievance calendar: Grievance Day is the third Tuesday of May. For 2026, that’s May 19, 2026. The filing window opens May 1, 2026, giving owners about 13 business days.
Unlike Nassau (centralized Assessment Review Commission), Suffolk grievances are filed at the town level. Each of Suffolk’s 10 towns has its own Board of Assessment Review (BAR), and you file with the BAR for the town your property sits in.
You use NY State Form RP-524 — the same form used statewide outside Nassau and NYC. The completed form goes to the assessor’s office of your town, in person or by certified mail postmarked by May 19, 2026.
Suffolk Boards of Assessment Review (by town)
File with the BAR for the town your property is in. All Suffolk BARs meet on Grievance Day (third Tuesday of May, May 19, 2026).
- Town of Babylon — View Babylon property tax data · Babylon Town Assessor’s office accepts RP-524 May 1, 2026 – May 19, 2026
- Town of Brookhaven — View Brookhaven property tax data · Brookhaven Town Assessor’s office, by 4:30pm May 19, 2026
- Town of East Hampton — View East Hampton property tax data · East Hampton Town Assessor’s office
- Town of Huntington — View Huntington property tax data · Huntington Town Assessor’s office
- Town of Islip — View Islip property tax data · Islip Town Assessor’s office
- Town of Riverhead — View Riverhead property tax data · Riverhead Town Assessor’s office
- Town of Shelter Island — View Shelter Island property tax data · Shelter Island Town Assessor’s office
- Town of Smithtown — View Smithtown property tax data · Smithtown Town Assessor’s office
- Town of Southampton — View Southampton property tax data · Southampton Town Assessor’s office
- Town of Southold — View Southold property tax data · Southold Town Assessor’s office
What Suffolk BARs want to see
Suffolk BARs evaluate three main types of evidence (in order of weight):
- Recent purchase price. If you bought in the last 18-24 months for less than your assessor’s market value, this is the strongest single piece of evidence.
- Comparable sales. Three to five similar homes that sold nearby (same town, similar size, similar features) for less than your assessed market value.
- Independent appraisal. Most useful for unique properties (waterfront, large acreage, recent fire damage, etc.). Cost: $400-$700.
Suffolk towns generally use market value on the assessment roll (unlike Nassau’s Level of Assessment system). So if your assessor lists your home at $750,000 and you can show recent comps at $675,000, you’re asking for a $75,000 reduction.
Frequently asked questions
Is the Suffolk grievance deadline always May 19?
No — it’s always the third Tuesday of May. In 2026 that falls on May 19, 2026. The date rotates every year because the third Tuesday changes. This is set by NY State law, not by Suffolk County.
Do I have to attend a hearing in Suffolk?
No. You can file Form RP-524 by mail (certified, postmarked by May 19, 2026) without ever appearing in person. If you want to add oral testimony, you can request a hearing — but most grievances are decided on the written submission.
What’s the success rate in Suffolk?
Historical reports from grievance firms suggest Suffolk BAR success rates of 40–60% (varies by town and case strength). Suffolk BARs tend to be stricter than Nassau’s ARC, so evidence quality matters more.
Can I grieve more than my recent purchase price suggests?
The strongest case is a reduction to your purchase price (or below, if you can show comps lower). Asking for a reduction far below market is rarely successful — Suffolk BARs are conservative.
What happens if I miss May 19?
Your next opportunity is May 2027 (Grievance Day 2027 is May 18, 2027). There is no late filing in Suffolk. Mark your calendar.
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Sources and citations
- NY Tax & Finance — Contest your assessment tax.ny.gov
- NY State Form RP-524 (grievance complaint form) tax.ny.gov
- NY Tax & Finance — Completing the grievance form tax.ny.gov
- Suffolk County Comptroller — Information for taxpayers suffolkcountyny.gov
- Suffolk County Clerk — Small Claims Assessment Review suffolkcountyny.gov
- JDSupra — 2026 Suffolk grievance filing period jdsupra.com
Last verified October 7, 2026. Tax rules change; we re-check every page each quarter.
Educational content and estimates only, not legal, tax or financial advice. Verify with your county or town receiver, an attorney or a CPA before making financial decisions.