Whether a Clarkstown assessment is too high usually comes down to three checks on the 2026 tentative roll. Here is the decision frame in plain English.
Yes, a Clarkstown 2026 assessment can be too high when the town priced a home against a different school-district stack than the one it actually sits in. Clarkstown Central, Nanuet, and Pearl River are not interchangeable, and Grievance Day is Tuesday, May 26, 2026.
If yes, what is the next move?
If the three checks line up, the case is an grievance filing with the Clarkstown Board of Assessment Review on or before Tuesday, May 26, 2026. Fair Appeal handles the full property tax appeal in Clarkstown and only charges a percentage of first-year tax savings when the value comes down. The Clarkstown assessment calendar is published by the Town of Clarkstown Assessor.
If no, what then?
If the checks do not line up, this is probably not the year. The Rockland County equalization rate moves annually and each school district resets its mill rate, which is why FairAppeal monitors the Clarkstown roll every year, not just once. A year that does not read appealable can shift quickly once next year's comp set lands. For the full Clarkstown picture see the Clarkstown property tax appeal guide.
Look up if you are overpaying on your Clarkstown home.
Clarkstown's grievance window closes the fourth Tuesday in May; sales data and the town's model often diverge.