Nassau County, N.Y. · Dates checked September 20, 2026
Nassau County tax grievance deadlines for 2027
Every date in the cycle, from the County’s own calendar.
Or add to Google or Outlook, or download the file. A subscribed calendar updates if the County moves a date.
The filing window
January 4–March 1, 2027. Confirm the dates on Nassau County’s appeal instructions before filing.
- Jan 2 Exemptions dueNew County exemptions, and yearly renewals of the senior and disability exemptions, for the 2027–28 tax year. Which exemptions need renewing
- Jan 4 Tentative rollThis is the assessment you appeal. Check your record once it is out. What to check on the tentative roll
- Jan 4 Filing opensFor the 2028–29 assessment year. Filing with ARC is free and does not require an attorney. County appeal instructions
- Mar 1 Last day to fileThe last day of the published window. Keep the confirmation the County’s system gives you. County appeal instructions
After you file
2027
to ARC reviews appeals and issues decisions
The Assessment Review Commission examines filed appeals and decides by March 31, 2028. County assessment review calendar
2028
Final roll published
The final 2028–29 roll includes changes ARC approved. County assessment review calendar
SCAR filing deadline
The County lists both April 28 and May 1, 2028; file by the earlier one. If ARC decides after April 1, you have 30 days from its decision. County SCAR page
School tax bills mailed
The first bills calculated from the 2028–29 roll. The first half is due October 1. County assessment review calendar
2029
General tax bills mailed
County and town taxes calculated from the 2028–29 roll. The first half is due January 1. County assessment review calendar
Remind me before the filing window opens
The published ARC filing window is January 4–March 1, 2027. Leave your email and we’ll send one reminder before it opens.
We’ll only use your details to send that reminder. No newsletter, no sharing, and nothing is filed with the County.Paying your tax bills
Town receivers bill the school and general tax in two halves each. Each half can be paid without penalty for about 40 days, then picks up a monthly penalty counted from the due date. Villages, Long Beach, and Glen Cove bill on their own dates. More on due dates
| Installment | Due | Last day without penalty |
|---|---|---|
| School tax, first half | ||
| General tax, first half | ||
| School tax, second half | ||
| General tax, second half |
Villages and cities on their own calendar
If your village or city assesses on its own roll, its grievance is separate from ARC’s. Villages on the County roll are covered by ARC. Which villages assess
| Where | Grievance due | Calendar |
|---|---|---|
| Freeport | November 17, 2026 (notice) | Add Freeport dates to my calendar |
| Thomaston | November 17, 2026, expected (notice) | Add Thomaston dates to my calendar |
| City of Long Beach | January 4 to January 19, 2027 (notice) | Add City of Long Beach dates to my calendar |
| 22 other villages | February 16, 2027 | By village |
| City of Glen Cove | June 1 to June 15, 2027 (notice) | Add City of Glen Cove dates to my calendar |
Keep reading
How to grieve your taxes in Nassau County
Check your assessment, file free with ARC by March 1, then go to SCAR if ARC doesn’t cut it.
The grievance form: filing online with ARC
Free, with no attorney needed. Gather your record, your view of the value and your evidence, then keep the confirmation.
Small Claims Assessment Review (SCAR)
An optional review after ARC, with eligibility rules, a $30 fee and a short deadline.