Suffolk County's grievance deadline is Tuesday, May 19, 2026. Unlike Nassau's centralized ARC, Suffolk files grievances at the town level with each Town's Board of Assessment Review (BAR). Roughly 461,685 Suffolk homeowners are eligible to file each year.
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.
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).
Suffolk BARs evaluate three main types of evidence (in order of weight):
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.
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.
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.
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.
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.
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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