Should I Grieve My Nassau County Property Assessment?
Questions to ask before filing a Nassau County grievance: assessment accuracy, comparable sales, recent purchase price, property condition, filing cost, and downside.
Reviewed by Chris Ambrosio, CPA · Updated October 7, 2026There is no single “magic number” that answers this question
A sensible decision starts with the current assessment and the evidence available for the property. The strongest reason to file is a supportable belief that the assessment is excessive or otherwise incorrect—not simply that property taxes feel high.
Reasons to take a closer look
- recent comparable sales suggest a lower market value;
- you recently purchased the home for materially less than the County’s indicated market value;
- the County’s property description contains a meaningful error;
- the home has condition issues or location factors not well reflected in the valuation;
- you want ARC to independently review the current annual assessment.
What is the downside of filing?
Nassau County does not charge a filing fee for an owner filing directly with ARC. Hiring a representative is optional. The principal costs are time and, if you hire help, the representative’s fee. A filing is not a guarantee of a reduction.
Why some homeowners hire GrieveItNow anyway
The appeal is accessible enough to DIY, but homeowners still have to research the property, understand Nassau terminology, prepare the filing, handle authorization requirements when represented, submit on time, and track the result. GrieveItNow’s value proposition is convenience and process execution for $99—not pretending the homeowner is incapable of filing.
Official filing dates and procedural references are based on current Nassau County Assessment Review Commission and Department of Assessment materials. County notices and rules control if they change. Educational information is not a guarantee of a reduction.
Reviewed by Chris Ambrosio, CPA
A Certified Public Accountant with over 13 years of financial experience. Chris spent more than six years at a Big Four accounting firm auditing financial services companies, followed by a year in private equity before nearly six years in the real estate industry as a Senior Manager of Accounting. He brings institutional-grade financial analysis to every property tax grievance filing.