Guide · Sources reviewed September 20, 2026

Is it worth grieving your Nassau County property taxes?

For most Nassau homeowners, yes. Filing with ARC is free and can’t raise your assessment, most homes that file win something, and a lower assessment lowers your share of every levy on the bill. The main cost is your time, or a firm’s fee if you hire one.

What it costs

Filing with ARC is free. The County charges no fee and requires no attorney. See its appeal instructions.
It can’t backfire on your assessment. The County states that ARC will never increase an assessment.
Your time. An evening to look up your record, find a few comparable sales, and file online between January 4–March 1, 2027.
A firm’s fee, if you hire one. Usually a share of the savings, owed only if you win.

How often Nassau homes win

For the 2028 roll, 62% of Nassau’s one-to-three family homes had a grievance filed. On the 2027 roll, 59% ended with a final assessment below what the County would otherwise have set, up from 47% on the 2024 roll. Because about as many homes win as file, most homes that file come away with some reduction. Winners’ cuts averaged about 9%.

The rates differ a lot by area. In some school districts fewer than a third of homes file; in others three in four do. See your town and district.

Common questions

Is it worth grieving property taxes in Nassau County?

For most homeowners, yes. Filing with the Assessment Review Commission is free, the County states it will never raise an assessment, and 59% of Nassau’s one-to-three family homes won a reduction on the 2027 roll. The cost is the time it takes to file, or a firm’s fee if you hire one.

The County’s assessment FAQ says the Commission will either reduce an assessment or leave it unchanged. Our grievance statistics show how many homes file and win in each town and school district.

How much does a Nassau tax grievance save?

Homes that won a reduction on the 2027 roll had their assessment cut by about 9% on average. Your saving depends on your tax rates and on how many neighbors also won, so no one can promise a dollar figure in advance.

As an illustration only: on a $12,000 school and general tax bill, a 9% cut in your share of the levies is worth roughly $1,000 for the year. Districts set their levies regardless of grievances, so filing mostly protects your share rather than lowering what the district collects.

When is grieving not worth it?

When the County already values your home at or below what it would sell for. ARC needs evidence that the market value is too high, usually sales of similar homes, and a home valued below its comparables has little to argue.

Check your home against similar homes nearby to see where the County’s value sits, and read how comparable sales are used.

Should I file myself or hire a grievance company?

Filing yourself is free and the County does not require an attorney. Most Nassau filings are made by firms, which usually charge a share of the first year’s savings. Paying for help makes sense if you won’t gather evidence yourself or expect to need SCAR.

See what a grievance costs and how to choose a company before signing anything.

Decide with your own record

The countywide odds are a starting point, not a verdict on your home. Look up your property to compare its County value with similar homes nearby, then read how the process works. This page is general information, not legal or tax advice, and savings are not guaranteed.