Ask The County Assessor


County Executive Curran Extends Property Assessment Grievance Period  Providing Homeowners with 60 Additional Days to File

ARC 2022/23 application grace period Applications received by the Assessment Review Commission  up through April 30, 2021 shall be deemed timely. The Commission recommends that to the extent possible property owners that plan to file do so as soon as possible.

Due to the current COVID-19 pandemic, the Nassau County Department of Assessment will be granting an extension for the filing of 2019 ASIE statements to June 1, 2020. Please stay safe during this trying time.

County Executive Laura Curran’s Taxpayer Protection Plan

How TPP works:

County Executive Curran’s Taxpayer Protection Plan (TPP) provides property tax exemptions that will protect homeowners from significant immediate increases in their property taxes as a result of the recently-completed countywide property reassessment, which was necessary to fix the County’s broken and corrupt assessment system.

TPP will phase in increases in property value due to the reassessment, effectively spreading out any changes in property taxes over a five-year period starting with the 2020-2021 assessment roll.

For more information, an updated FAQ on TPP is available here.

Status of TPP:

County Executive Curran secured authorization for the phase-in plan from New York State in April 2019.

Although TPP has been authorized by the State, it must be passed by the Nassau County Legislature to be implemented.  

The County Legislative Majority has been stalling since April 2019, refusing to allow a vote on the local legislation that will enact TPP and ease the tax burden of the reassessment.

Commercial property owners automatically will continue to have a five-year phase-in of their new values. Nassau’s residential property owners would be provided the same protection with the passage of the TPP. Also, a recently-released report by the New York City Advisory Commission on Property Tax Reform recommends that annual valuation changes for NYC residential properties be phased in over five years.

If approved by the County Legislature, homeowners would see the effects of the TPP in their school tax bill in October 2020 and their general tax bill in January 2021.

County Executive Curran recommends that residents contact their local legislator by calling 516-571-6200, ext. 7, to urge them to pass this crucial legislation.  

How will TPP affect you?

To continue to provide transparency for taxpayers, the Department of Assessment in 2019 prepared Taxpayer Protection Plan statements for every homeowner.  The TPP statements show hypothetical estimated property taxes for the 2020-2021 tax year and are available online here.

These estimates factor in:

  • eligibility for tax exemptions including Senior Citizen, STAR, Enhanced STAR and Veterans;
  • County, town, special district and school district tax levies for the 2018-2019 tax year;
  • successful grievances with the Assessment Review Commission (ARC) for 2018-2019 and 2019-2020 assessment rolls; and
  • the impact of the County Executive’s Taxpayer Protection Plan.      

The Department of Assessment is preparing new statements based on the most up-to-date information possible, including school and general budgets for the 2019-2020 tax year.

Check back soon!

Now Available: Notice of Tentative Assessed Value for 2021/2022

Notice of Tentative Assessed Value is an annual statement from the Nassau County Department of Assessment (DOA). It provides every property owner with an updated value of their property. In addition to being posted online here, Nassau County property owners were mailed this notice in January 2020. 

If your property assessment increases, it does not necessarily mean your taxes increase.  The property value shown in your Notice of Tentative Assessed Value is only one of several factors in determining your property taxes for the 2021/2022 tax year.

Trending Sales Study Percentages

On January 2, 2020, the Department of Assessment published the 2021-2022 Tentative Assessment Roll, providing homeowners with an updated value of their property based on the local real estate market and trends of homes sales in each school district, over the past year. In addition to being posted online, an annual Notice of Tentative Assessment with these updated values were mailed to every homeowner. 

Note - If your property assessment increases, it does not necessarily mean your taxes increase. The property value shown in your Notice of Tentative Assessed Value is only one of several factors in determining your property taxes for the 2021-2022 tax year.

A majority of Tax Class 1 2020-2021 values were trended up by the factors in a chart you can review in the link below. Properties excluded from the trending were properties that had new construction or substantial alterations, properties that had a tax lot merger or apportionments, and properties with values exceeding $2.3 million in market value. The trends were applied to the 2020-2021 assessed values incorporating any Assessment Review Commission offers made as of December 15, 2019. 

File:  Sales Trends Study Percentages by School District 2021-2022

Keeping property assessments up-to-date

The County recently completed a reassessment, producing up-to-date market values for every property in the County for the first time in almost a decade to restore fairness and accuracy to the assessment system. The County is continuing to utilize state-of-the-art technology to keep market values current and reflective of the real estate market. 

Good news!  Property value in Nassau County is increasing

Our assessments reflect the real estate market which shows that home values are generally increasing, which is a great thing for Nassau County’s homeowners.  Increased home values validate home investments here in Nassau County.  It means that homes are worth more than they were the year prior.

SCAR 20/21 Filing Period

Nassau County’s Department of Assessment has published the 2020/21 Final Assessment Roll and the Assessment Review Commission has issued its Final Determinations for the 2020/21 year. ARC’s Final Determinations detail that the filing period to challenge ARC’s determinations runs from April 1st through April 30th

However, due to the current public safety and health concerns, Governor Cuomo and the NYS Unified Court System have taken measures to extend this filing period. 

The SCAR filing period began Monday, May 25, 2020 and will run through Wednesday, August 5, 2020.

Understanding Property Assessment Powerpoint

County Assessor David Moog as well as DOA staff will be on hand to answer questions and to review information on individual properties. All handouts and brochures will be provided in English and Spanish. 

DOA’s planned series of community information sessions will be conducted separate from the Assessment Review Commission’s (ARC) grievance workshops and DOA’s property tax exemptions workshops. DOA will continue to support and participate in both workshop series.

Newsday: Nassau reassessment fairer and more accurate, analysis shows

April 29, 2019 - Newsday published an in-depth analysis, endorsed by several industry professionals, of the first countywide property reassessment in nearly a decade. The comprehensive study concluded that the reassessment eliminated the inaccurate and unfair wide disparities among home values that developed under the Mangano Administration. The study found that the new assessments are well within every major professional standard, with experts quoted saying, “Getting much better than this is not really feasible.” For the full story, visit:

About the Department of Assessment

The Department of Assessment is responsible for developing fair and equitable assessments for all residential and commercial properties in Nassau County on an annual basis. The County’s assessment roll includes over 423,000 properties with a value of $264 billion. It is the second largest assessing entity in the State of New York after New York City.


  • Collecting and recording relevant residential, commercial, and industrial property information.
  • Validating building permits by confirming all new construction and including the new value on the next assessment roll.
  • Maintaining property records and tax maps.
  • Answering public inquiries.
  • Assisting the public through the Department’s outreach program.
  • Processing applications for property tax exemption and the Basic and Enhanced STAR programs for qualifying Nassau County homeowners.

Schedule a Physical Inspection of Your Property

If you would like to schedule a physical inspection of your property, please send an email to or a letter to 240 Old Country Road, 4th floor, Mineola, NY 11501. In your correspondence with the Department of Assessment, please include the address of the property you wish to have inspected and your contact information.

Verification of Tax Map Info

To File Electronically - Click Here