Key Dates

May 1st (Taxable Status Date):

Assessments reflect the ownership and physical condition of a property as of this date.  In addition, exemption applications must be filed / postmarked by this day. 

June 1st (Tentative Assessment Roll):

Date tentative assessments are made available (online and in office). This is also the date that change of assessment notices are mailed for any property seeing a change in assessment including changes resulting from a systematic analysis or revaluation, building permit, inventory discrepancy, demolition, etc.   Please note, the Town of Mamaroneck mails “change of assessment” notices to ALL property owners, even if the assessment remains the same. If a property owner disagrees with the assessed value of their property, a grievance may be filed beginning this day.

June 1st thru Third Tuesday in June (Time frame to file a grievance):   

The Board of Assessment Review will convene on the third Tuesday in June (Grievance Day). At this time we are hopeful that the Town can continue to receive grievances by mail as well as in person, as in past years.  For the safety of our residents and staff, an update to this site will be made if it is necessary to change procedures on “in person” filings.

September 15th (Final Assessment Roll): 

Date on which final assessments are made available and the first day to file Small Claims Assessment Review / Certiorari petitions.  Final assessments include all changes made by the Board of Assessment Review.

July 1st of Preceding Year (Valuation Date):

The Valuation Date is the date upon which the value of your property is based. In the Town of Mamaroneck the Valuation Date is July 1st of the prior year.   For instance, assessments on the 2023 assessment roll are based on the value of your property as of July 1, 2022.