Nassau County, N.Y.Good GrievesSources reviewed September 20, 2026

How your Nassau County property tax bill is calculated

A Nassau County tax bill looks complicated because it combines many small decisions made by different bodies. The arithmetic underneath is simple, and knowing which part is which tells you what a grievance can and cannot change.

The formula

Nassau County states it plainly: “The tax receiver multiplies the rates for the districts in which your property is located by the assessed value of your property to determine your bills for school and general taxes.” Each part of that sentence comes from a different place.

1. Market value. The Department of Assessment estimates what your property would sell for under ordinary circumstances.
2. Assessed value. The County applies a uniform level of assessment to that market value. For the 2027–28 roll, appealed in early 2026, the County FAQ lists 0.1% for residential Class 1 property. At that level, a home the County values at $700,000 would carry an assessed value of $700.
3. Taxable assessed value. Any exemptions you receive are subtracted from the assessed value for the taxes they apply to.
4. Tax rates. Each district’s rate is stated per $100 of assessed value. The County describes adding the rates of every jurisdiction your property is in and multiplying that “consolidated tax rate (per hundred)” by your assessment.

Because the assessed values are small, the rates are large. Neither figure means much on its own; only the product does.

Two bills, many districts

Nassau County’s taxing jurisdictions range from the County itself to towns, cities, villages, school districts, library districts, and other special districts, and the County notes that the exact set depends on where you live. They reach you on separate bills:

• The school tax bill carries your school district’s tax. The County’s FAQ says school bills based on a final assessment roll go out in October.
• The general tax bill carries county and town taxes and any special districts, such as sanitation or fire districts, according to the Town of Hempstead. General bills from the same roll go out the following January.
• Village and city taxes are billed separately, by the village or city.

Two neighbors on either side of a district boundary can have the same assessment and different bills, because a different combination of rates applies to each. When you compare your bill with someone else’s, compare the districts first. Our guide to property tax due dates explains when each bill is payable and to whom.

How a district sets its rate

Rates are the output of budgets, not an input. Nassau County explains that “the tax revenue required is divided by the assessed value of all property in the district to determine the tax rate.” Put another way, a district decides how much to raise, and the rate spreads that amount across every property in the district according to its assessed value. The Department of Assessment assigns property to one of four classes, and one, two, and three-family homes and residential condominiums of three stories or less that were not converted from rental or cooperative use are Class One; the class affects which level of assessment applies.

Where exemptions fit

An exemption lowers the taxable assessed value for the taxes it covers; it does not change the County’s estimate of what your home is worth. The County lists the Basic and Enhanced STAR school tax exemptions and other partial exemptions based on age, income, disability, and military or volunteer service. New York State says the STAR exemption is no longer available to new homeowners, who register for the STAR credit instead; the State pays the credit by check or direct deposit rather than as a reduction on the school tax bill. Apply for County exemptions through the Department of Assessment; our exemptions guide separates them from an appeal.

What a grievance changes

A grievance asks the Assessment Review Commission to lower the assessed value in step 2 above. It does not touch the rates. Since each district divides its levy across all assessed value, a lower assessment means your property carries a smaller share of each levy than it otherwise would. Your neighbors’ assessments, and the district’s budget, are unaffected by your appeal.

That is also why the result is not a fixed dollar figure. If a district’s budget grows, your bill can rise even after a reduction, only by less than it would have. For Class 1 homes the County also limits how fast an assessment may rise: the County FAQ states that the total assessment may not increase more than 6% in one year or more than 20% in five years. Filing with ARC is free, according to the County’s appeal instructions, and ARC will never increase an assessment.

Put your own numbers next to your area’s

Start with your record, then look at the districts around you. Check your property to see the available County figures for your home, and see property taxes by area for how bills compare across Nassau County. If the assessed value looks too high for the home you own, the filing deadlines show when you can ask ARC to review it. This page is general information, not legal or tax advice, and savings are never guaranteed.