Nassau Fair Share by Tax Fair Share

How to file your Nassau County grievance

You file online with the Assessment Review Commission (ARC) on its free AROW site. No lawyer or firm is needed, and filing costs nothing. Here's every step.

January 4, 2027AROW opens (9 am)
March 1, 2027Last day to file
2028/29Assessment roll you're grieving

Haven't checked your home yet? Start there: it builds the numbers you'll enter below.

Check my home
Before you start. If you signed with a grievance firm for this year, don't file yourself too. Many firm contracts renew each year, and ARC can deny both filings when two people file for the same property (ARC rule 9.3). Cancel with the firm in writing first, or let them file.

Step by step

Building your evidence on the Nassau homepage takes about 15 minutes; filing on AROW takes 15 to 30 more. Have your comparison results or Evidence Pack open in another tab.

  1. Wait for the window

    AROW takes grievances from January 4, 2027 (9 am) to March 1, 2027. In early January, the county publishes the new tentative value for your home. Check it, and recheck your case on the Nassau homepage if it changed.

  2. Register on AROW

    Go to AROW and choose "Register With ARC". Use the owner's name exactly as on the deed, pick representative type Self, and choose your own user ID and password.

  3. Find your property

    Search by house number, street and ZIP. Confirm the Section, Block and Lot match the ones shown on the Nassau homepage.

  4. Check the house details

    If AROW's living area, bathrooms, lot size or year built are wrong, correct them with "Change Values". A wrong record is a reason to grieve on its own.

  5. Pick your comparable sales

    AROW's Sales Locator lists recent sales near you. Tick up to 5: use the same sales as your comparison results, the ones most like your home in size, style and location.

  6. Fill in the application

    For a 1 to 3 family house this is form AR1. Your claim is that the market value is too high. Enter the requested market value from your comparison results.

    • Ask for the full reduction your evidence supports. ARC won't go lower than the value you request.
    • ARC converts market value to assessed value at its published level of assessment.

  7. Attach your evidence

    Upload your Evidence Pack PDF, or your own write-up of the comparison results saved as a PDF. If you bought recently, add your closing statement or an appraisal.

  8. Review and submit

    Check every page, then submit it yourself. Save the appeal number and the confirmation email. No email within 48 hours? Check your AROW account.

  9. Wait for the decision

    ARC reviews grievances over the following months and mails a decision. It may offer a lower value first; you can accept it or ask for a full review. If you disagree with the final decision, the notice explains how to go to Small Claims Assessment Review (SCAR).

Common questions

Can my taxes go up because I filed?

No. ARC can lower your assessment or leave it as it is. It never raises an assessment because you grieved.

Do I have to file every year?

Each grievance covers one assessment roll. If you think your value is still too high next year, file again in the next window.

Can I file for a home I don't own?

Only the owner, or a representative the owner has authorized in writing, can file. This guide is for owners filing for themselves.

Ready? Build your evidence first, then come back here to file.

Go to the Nassau homepage

Tax Fair Share is an independent, free self-help tool. It is not affiliated with Nassau County or the Assessment Review Commission, and it does not provide legal advice or file grievances on anyone's behalf. Check dates and rules on ARC's own site before you file.