Taxpayers have the right to file a grievance regarding their property’s assessed value. Grievances may be filed with the Nassau County Assessment Review Commission during the “grievance period,” occurring January 2nd to March 1st. During the grievance period, you may examine the assessment rolls and obtain grievance applications Form AR1 at the Nassau County Assessment Review Commission, 240 Old Country Road, Mineola New York 11501, or call 516-571-3214. Taxpayers may also file a grievance online.

Are you over assessed?
To determine if you are over assessed, insert the market value of your home into the following equation. (The assessed value of your property is listed on the receipt.)

     Market Value X .0025 = Claimed Assessed Value

     Assessed Value/.0025 = Assessed Market Value


Grievance Period
DATE: January 2nd – March 1st
TIME: Monday-Friday, 9:00 am-4:45 pm
PLACE: Nassau County Board of Assessors, 240 Old Country Road, Mineola, NY 11501
For further information , visit

For applications or further information about the grievance process, please call 516-571-3214 after December 31st.