NASSAU COUNTY HOMEOWNER RESOURCES
Nassau County tax grievance deadlines for 2027
The dates that matter for a Nassau County property tax grievance, on one page, each linked to the County source it comes from.
The published ARC filing window is January 4–March 1, 2027. Confirm the dates on Nassau County’s appeal instructions before filing.
The 2027 cycle at a glance
| When | What happens |
|---|---|
| Before January 4 | The County publishes the tentative assessment rollThis is the assessment you appeal. Check your record once it is out. What to check on the tentative roll |
| January 4, 2027 | The ARC filing window opensFor the 2028–29 assessment year. Filing with ARC is free and does not require an attorney. County appeal instructions |
| March 1, 2027 | The ARC filing deadlineThe last day of the published window. Keep the confirmation the County’s system gives you. County appeal instructions |
| Usually April 1 | The Department of Assessment publishes the assessment rollThe County’s Small Claims Assessment Review deadline is counted from this publication. County SCAR page |
| Last business day in April | The SCAR filing deadlineIf ARC has not decided your appeal by then, the County describes a window of 30 days from ARC’s decision instead. County SCAR page |
If the County changes a date
The County sets these dates and can change them. If ARC publishes a different deadline, we will update this page and note the change here. Until then, treat the County’s own page as the final word, and file early rather than on the last day.
Village and city assessments run separately
These dates cover the County assessment reviewed by ARC. A village, the City of Long Beach, or the City of Glen Cove assesses separately, with its own process and deadlines, so check with the local assessor rather than assuming the ARC window applies.
BEFORE THE WINDOW OPENS
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.Keep reading
How the tax grievance process works
The full sequence, from the tentative assessment roll through ARC’s review and Small Claims Assessment Review.
Filing your grievance online with ARC
What to gather before you open the County’s online application, how a filing proceeds in outline, and which confirmation to keep.
Small Claims Assessment Review (SCAR)
Who is eligible, the $30 filing fee, and the short deadline that runs from the roll or from ARC’s decision.