Nassau County Real Property Owners: Check Your Mail

Nassau County 2020-2021 Tax Assessment

In letter, predated November 1, 2018, the Nassau County Department of Assessment reported to all Nassau County real property owners that Nassau County is in the process of finalizing the reassessment of all properties in the County for the first time since 2011. Enclosed with this letter, and pursuant to Real Property Tax Law Section 511, Nassau County is sending to all property owners a notice of the tentative assessment, entitled Assessment Disclosure Notice, for the 2020/2021 tax year. You should receive your written notice by November 1, 2018.

According to this notice, your tax liability will be affected by several factors in addition to your assessment, including municipal budgets and levies, assessments of other properties, and applicable exemptions, if any. For information concerning exemptions, such as senior citizen and veteran exemptions, visit

The Assessment Disclosure Notice includes a preliminary updated estimate of the market value and the assessed value for your property. To view the information contained on your Assessment Notice online, visit Due to the predated letter, we presume the information contained on this site will be current as of November 1, 2018.

To date, the County has not sent out any notice regarding what real property owners can expect to pay in taxes for the 2020-2021 year. The County intends to mail out this tentative tax payment information by January 2, 2019. County Executive Curran is seeking state approval to phase in the tax increases for the under-assessed properties and decreases for the over-assessed properties over a five-year period.

Curran has ordered the assessment ratio for residential properties lowered from 0.25 percent to 0.10. Keep in mind, those who successfully grieved their taxes over the course of the past seven years saw an assessment ratio lower than 0.25 percent. By lowering the assessment ratio uniformly, Curran intends to correct the discrepancy between how much is paid by property owners who grieved their taxes and those who did not. This could prove to create big increases and decreases in what people owe in taxes.

Nassau County Assessor David Moog has provided levels of assessment for the tentative 2020/2021 tax roll. He has set the new class one level of assessment at .10%, and has set the levels of assessment for property classes two, three and four at 1%. According to the Department of Assessment website, this initiative will “create an accurate assessment roll for the first time since the roll was frozen” in 2011.

The Department of Assessment is directing real property owners to a new website: There, you can view a list of frequently asked questions and make an appointment to meet with the Department of Assessment staff to discuss your questions and concerns.

We have a meeting scheduled with the Nassau County Department of Assessment on November 2, 2018. At that time, we expect to have more details concerning this development. Stay tuned…