Long Island property tax data

We estimate the property tax bill for every home on Long Island: each residential property on New York State’s assessment roll for Nassau and Suffolk (847,826 one-, two- and three-family houses and other residential classes; apartment and co-op buildings are not included), using the same calculator as the address lookup on this site.

• Line by line where we can. 97% of homes are priced from the towns’ own tax rate sheets (all ten Suffolk towns) and Nassau County’s tax records: assessed value times each school, town, county, fire, library, water, sewer and lighting district’s rate, plus flat charges like garbage districts.
• The rest from state rate tables. Where the town or county rate data doesn’t cover a home, it is priced from New York State’s published tax rates and an estimate of market value from recent sales, with a correction for special districts measured against real bills.
• Before exemptions. Medians and rankings use each home’s bill before personal exemptions such as STAR, senior and veterans’ exemptions: the bill on the house itself, what a buyer would pay in the first year, and the same basis for every home. “Where the money goes” uses the bills owners pay, with their exemptions.
• Special districts in Suffolk. Fire, water, library and similar districts depend on exactly where a home sits. Where we have already placed a home on the district maps, we use that; otherwise its bill uses the combination of districts, among those it could be in, that covers the most taxable value. So a single home’s figure here can differ from its own address page, which looks the location up.
• Where a property is. Towns and ZIP codes are by the property’s own location from the county parcel maps, not the owner’s mailing address.

What to keep in mind

• These are estimates, not tax bills. Incorporated village taxes are estimated where we have the village’s rate and otherwise not included, so bills in villages can run higher.
• Medians for places with few homes swing more; we don’t publish a median for a school district with fewer than 50 homes or a town or ZIP code with fewer than 100, and we rank only places with at least 500 to 1,000.
• The numbers recalculate on their own whenever new assessment rolls, tax rates or sales are loaded. The date at the top of this page is when they were last computed.

Sources: New York State assessment rolls and tax rates, the ten Suffolk towns’ tax rate sheets, Nassau County’s tax records, the counties’ parcel maps, and the State Education Department’s Property Tax Report Card data. More on the calculator: how the estimate works.