Find Property Tax Records in Nassau County

Nassau County property tax records are available through MyNassauProperty.com and the county's Department of Assessment. Unlike most New York counties where local town assessors set values, Nassau County handles assessments at the county level for all towns and cities within its borders. You can search assessment rolls, view tax maps, check exemptions, and look at comparable sales data online at no cost. The Assessment Review Commission in Mineola processes grievances each year between January 2 and March 1 with no filing fee. Property owners in Hempstead, Oyster Bay, and North Hempstead all use these same county-level tools.

Nassau County Property Tax Records Online

The primary search tool for Nassau County property tax records is MyNassauProperty.com. This Land Records Viewer gives access to assessment roll data, district info, tax maps, property photos, past taxes, tax rates, exemptions, and comparable sales. The system links to the county's Geographic Information System and shows maps of every parcel in Nassau County. You can search by section, block, and lot number or by address. Tax map copies can also be purchased at the Tax Map Division window from 9 AM to 4:30 PM.

One thing to keep in mind with Nassau County is that the County Assessor and County Clerk databases use different formats for section, block, and lot numbers. Make sure your SBL matches the format used by whatever office you are searching. The Clerk's office at (516) 571-2660 can help if you run into trouble matching records between the two systems.

Nassau County Property Tax Assessment Grievances

Nassau County handles property assessments differently from most of New York. The county Department of Assessment sets values for all properties rather than leaving it to individual town assessors. This centralized approach means one office manages assessments across Hempstead, Oyster Bay, and North Hempstead. If you disagree with your assessed value, you file a grievance with the Nassau County Assessment Review Commission (ARC) at 240 Old Country Road in Mineola.

The filing period runs from January 2 to March 1 each year. There is no fee to file. Your assessment can only go down or stay the same through this process. It will never go up as a result of your grievance. You can file yourself online, by mail, or hire a representative to do it for you. The ARC reviews each case and issues a decision. If you still disagree after the ARC ruling, you can take the matter to court under RPTL Article 7.

This is a big deal for Nassau County homeowners. Thousands of grievances get filed each year because property values on Long Island can shift fast. The free filing and no-risk nature of the process make it worth trying if you believe your assessment is too high.

Paying Nassau County Property Taxes

Tax collection in Nassau County happens at the town level. Each town has a Receiver of Taxes who handles billing and payment. The Town of Hempstead Tax Office can be reached at (516) 538-1500. The Nassau County Treasurer at (516) 571-2090 manages county-level tax matters. School taxes are billed separately and collected by the individual school districts.

Payment options vary by town but generally include in-person payment at town hall, mail-in checks, and online payment through the town's website. Credit card payments usually carry a convenience fee of 2% to 3%. Late payments trigger penalties that increase each month. Under RPTL Section 922, not receiving a tax bill does not excuse late payment. If your bill did not arrive, contact your town tax office right away for a duplicate copy. Nassau County has some of the highest property tax rates in the state, so staying on top of due dates matters.

State Tools for Nassau County Tax Research

The Municipal Data Portal lists Nassau County assessment contacts and links to local search tools. The Check Your Assessment page explains how to review your value and decide if a grievance is warranted. SalesWeb provides years of sales data for Nassau County municipalities that you can use as comparables when challenging your assessment.

The full Real Property Tax Law is on the New York State Senate website. Key provisions for Nassau County include the assessment grievance process under RPTL Article 5, court review under Article 7, and exemption rules. The state ORPTS office provides oversight for the county assessment system and can answer questions about how Nassau County's centralized model works compared to the rest of the state.

Cities in Nassau County

Nassau County has three major towns with pages on this site. All three use the Nassau County Department of Assessment for property valuations, though each town collects its own taxes.

Nearby Counties

Nassau County borders Queens to the west and Suffolk to the east. Both counties handle property tax records differently from Nassau's centralized system.