Guide · Sources reviewed September 20, 2026

How to grieve your property taxes in Nassau County

Check your assessment record, file free with ARC from January 4 to March 1, 2027, and expect its decision by March 31 of the next year. SCAR is a separate, optional step if ARC doesn’t cut it.

Step 1: The County publishes a tentative assessment

Nassau County issues a new assessment for each year, and each year’s assessment is appealed on its own. An appeal you filed last year does not carry forward. Before doing anything else, note which assessment year you are looking at and the date you retrieved the record. Our assessment guide explains how market value, assessed value, and your eventual tax bill differ.

Step 2: You file with the Assessment Review Commission

The Assessment Review Commission (ARC) is the County body that reviews assessment appeals. Two facts from the County’s own instructions matter to most homeowners:

• There is no fee to file with ARC.
• You are not required to use an attorney.

You should not file for yourself if someone is already filing on your behalf, for example, if you own a condominium and the board of managers files for the building. Duplicate applications and overlapping authorizations create avoidable problems, so check any existing agreement first.

Step 3: ARC reviews the assessment

ARC’s review can end in a reduction or in no change. The County states the outcome plainly: “The Assessment Review Commission will either reduce your assessment or leave it unchanged.” If you have been putting off an appeal because you fear the number could move the wrong way, see our guide on whether filing can raise your assessment.

Step 4: The roll becomes final

The Department of Assessment publishes the assessment roll, usually on April 1. That publication is what starts the clock on the next step, so it is worth watching if you expect to go further.

Step 5: Small Claims Assessment Review, if you want to go further

Homeowners who are not satisfied can pursue Small Claims Assessment Review (SCAR), an optional judicial review that the County describes as one “most homeowners may pursue on their own, without an attorney or representative.” It is limited by property type, carries a $30 filing fee, and has a short deadline measured from the roll’s publication or from ARC’s decision. Read our SCAR guide or the County’s SCAR page before relying on those dates.

Why to file every year

A school district’s levy is shared across its homes by assessed value. When your neighbors win reductions and you don’t file, your share of the levy grows, even if your own assessment never changed. Filing costs nothing at ARC and the County says it cannot raise your assessment, so many homeowners file each year until they are confident their home and their neighbors’ are valued correctly.

A village or city assessment is a separate track

If your property is assessed by a village, the City of Long Beach, or the City of Glen Cove, that assessment is appealed with the local Board of Assessment Review rather than through ARC. The County FAQ explains the distinction. Long Beach takes grievances in January and Glen Cove in June; the deadlines page lists every village and city date.

What to do between now and the filing window

The useful preparation is unglamorous: know your record, know your questions, and know your deadlines. Look up your property to see the available County figures, note the details you want to verify, and read the filing-window guide for a checklist. To see how assessments compare nearby, browse our school district and village pages. Good Grieves does not file anything with the County on your behalf through this website, and savings are never guaranteed.