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.
Whether a Clarkstown assessment is too high usually comes down to three checks on the 2026 tentative roll. The strongest signal across all three is a same-school-district comp set that closes below the tentative assessed value. When that pattern lands, the case is typically worth a Grievance Day filing.
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.