Nassau County Property Tax Appeal Guide (2026)
You might be wondering how to lower my property taxes in Nassua County? Follow this proven step-by-step process from Abode Money to successfully challenge your Nassau County property assessment and potentially save thousands on your property tax bill.
Mar 1
Filing Deadline
FREE
Filing Fee
RP-524
Required Form
Important Timeline
Your assessment notice is mailed in January. You have until March 1st to file your grievance with the Assessment Review Commission.
3 Steps to File Your Grievance
Follow this proven process to successfully challenge your Nassau County property assessment and maximize your chances of a successful reduction.
Gather Your Evidence
Collect comprehensive documentation that proves your property is overassessed compared to similar properties in your area.
File Your Grievance
Complete the RP-524 grievance form and submit it online or by mail to the Nassau County Assessment Review Commission before the March 1st deadline.
Attend Your Hearing
Present your case to the Assessment Review Commission at your scheduled hearing (hearings typically run from March through May).
Complete Filing Guide
Follow these detailed steps to successfully file your property tax grievance with Nassau County. Each step includes specific requirements and deadlines you must meet.
Gather Your Evidence
Our Competitive Market Analysis will provide a strong foundation for your appeal, but you can absolutely supplement it for an even stronger case with:
Evidence Checklist:
Pro Tip
Nassau County uses a unique assessment system with class ratios. Our Comparative Market Analysis (CMA) accounts for these ratios and provides the comparable sales evidence that makes the difference between winning and losing your grievance.
File Your Grievance
Complete your RP-524 grievance form and submit it online or by mail to the Nassau County Assessment Review Commission before the March 1st deadline.
Critical Deadline Warning
Missing the March 1st deadline means you cannot grieve your assessment this year. No extensions are granted, so submit as early as possible.
Filing Requirements:
Attend Your Hearing
Present your case to the Assessment Review Commission during the hearing period from March through May.
Hearing Process
After filing, you'll receive a hearing date by mail. Hearings are typically held at the Nassau County Assessment Review Commission offices in Mineola. You can attend in person or, in some cases, submit additional documentation in lieu of appearing.
Hearing Preparation:
Hearing Best Practices
Practice explaining your case beforehand. Focus on your strongest comparable sales and be ready to explain why your property's assessed value exceeds its market value. The commissioners want to hear factual evidence, not emotional arguments.
Receive Your Decision
The Assessment Review Commission will mail their decision after the hearing process concludes.
What to Expect:
✓ Success Timeline
Successful grievances typically see the reduction reflected on the next property tax bill. Keep all documentation for future reference and potential annual grievances.
Nassau County Quick Facts
Filing Method
Online or Mail-In Filing
Filing Fee
FREE - No Cost to File
Deadline
March 1st
Form Required
RP-524 Grievance Form
Assessment Notice
Mailed in January
Hearing Format
In-Person at ARC Office
Need More Information?
For complete New York property tax information including rates, exemptions, and appeal processes for other counties, visit our New York property tax guide.
Don't Miss Your Chance to Save
With the March 1st deadline approaching, now is the time to act. File your grievance today or get professional help from Abode Money, the best property tax appeal company, to maximize your chances of success.
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