Nassau County, New YorkProperty records & tax offices
Links open the listed public-office or service-provider website in a new tab. This directory does not collect payments.
Find the right property record
Use the property portal for ownership and assessed value, the collector for a bill or balance, and the map for parcel location. Have the address, owner name, or parcel number ready.
Tax bills & filing dates
These are the dates and qualifications recorded in the directory. Confirm your tax year and current deadline with the official office and your property’s notice.
- Tax bill mailing
- For the 2026/27 tax year, school tax bills are mailed October 1, 2026 and town/city general tax bills are mailed January 4, 2027.
- Assessment appeal
- January 2 through March 2, 2026 is Nassau County's ARC filing period for the 2027/28 assessment; April 30, 2027 is the judicial-review petition deadline. The county's 2026/27 filing period was January 2–March 3, 2025.
Exemptions & appeals
View exemption application (opens in a new tab)Exemption filing
Applications for the 2027/28 Nassau property-tax year must be received by January 4, 2027; STAR is applied for through New York State, not Nassau County.
Senior relief
Nassau's Senior Citizens Property Tax Exemption is for eligible homeowners age 65 or older with income of $58,399 or less and may reduce assessed value by up to 50%; Nassau also has New York's Enhanced STAR benefit with a 2026 income limit of $110,750.
Valuation limits
For Nassau Class 1 residential property, New York Real Property Tax Law §1805 limits assessed-value increases to 6% in one year and 20% over five years, excluding additions and renovations. Class 2 and 4 property uses transitional assessments rather than that Class 1 cap.
For a valuation appeal, use the appeal date in the tax and filing section above. Keep your notice, supporting evidence, and proof of submission.
More exemption & appeal guidance →