Challenge & Lower Your Taxes

Your Home's Assessment

Your property’s assessed value, or assessment, represents the market value of your house, as calculated by the Nassau County Department of Assessment and is the figure upon which your property taxes are based.   Normally, the County Assessor updates your property’s assessment each year to reflect new market conditions, although current assessments are frozen at last year’s value.  Whether frozen or not, each January the County mails a “Notice of Tentative Assessed Value” to inform each Nassau County homeowner of their updated assessed value.

Challenge Your Tax Assessment

The “Notice of Tentative Assessed Value” will help determine future property tax bills and should be checked by homeowners every year to ensure accuracy.  If you believe your tentative assessed value is too high, you may file an Application for Correction of Assessment with the Nassau County Assessment Review Commission (ARC).  The Assessment Review Commission is an independent County agency that is responsible for reviewing and ruling on each Application for Correction.  It is important to note that assessments cannot be increased by the Assessment Review Commission; ARC can keep a Tentative Assessed Value unchanged or lower an assessment, but it cannot raise the assessment of a homeowner who files an application for correction. 

How to Challenge

Filing Period

You may file an appeal to challenge your property's assessment from January 3, 2022, to March 1, 2022.


Application for Correction of Assessment forms will be available online from the Assessment Review Commission website after January 3rd. Applications may be filed electronically through the county's online appeal system called AROW-Assessment Review through March 1, 2022, with the same effect as filing on paper. Successful transmissions generate an appeal number immediately, and an email message after a short delay.

By Phone

You may request an Application for Correction of Assessment form be mailed to you by calling the Assessment Review Commission at 516-571-3214.


Application for Correction of Assessment forms may be obtained and submitted in person at:
240 Old Country Road
5th Floor
Mineola, NY 11501

Hours are from 9 am to 4:30 pm, Monday to Friday, except holidays.

By Mail

Applications can be mailed to the Assessment Review Commission at:
240 Old Country Road
5th Floor
Mineola, NY 11501

Mail must be postmarked by the USPS no later than March 1, 2022.

Assessment Review Commission

The Assessment Review Commission is an independent agency that is responsible for reviewing all applications for correction and making decisions on grievances filed in Nassau County. The commission reviews appeals that have been filed and makes determinations if the assessed value of a property is excessive or not.

Small Claims Assessment Review

Owners who are not satisfied with the Assessment Review Commission's decision have the right to file an appeal called a Small Claims Assessment Review (SCAR) Petition in the Nassau County Clerk's Office to seek further review of their assessment. At the SCAR hearing, individuals or their representatives may present evidence of unequal or excessive assessment to a SCAR hearing officer. 

A filing fee of $30 applies but may be reimbursed by the county if there is a successful outcome. Forms and instructions are available  online or at the Nassau County Clerk's Office located at:
240 Old Country Road
Room 108
Mineola, NY 11501

Taxpayers who have won assessment reductions through SCAR should continue to pay their taxes as originally billed until they receive a corrected tax bill. The Nassau County Treasurer's Office will recalculate any payment made at the higher assessment and send refunds of the difference owed to you at a later date.

Incorporated Villages

Incorporated villages within the Town of Hempstead have the right to utilize their own assessments for village tax purposes, or they may choose to utilize the county's assessment roll as a basis for their assessments. If you live in an incorporated village, you must file separately to challenge your village assessment. Contact your village assessor for information on how to challenge that assessment.