01
Review the record
We confirm the parcel, the market value behind your assessment, and the home's recorded size, rooms and features. We also check whether a city or village assesses it too.
Nassau County property tax grievances
Lower an over-assessed Nassau County home
Homespring checks your Nassau County record, gathers the sales that support a lower value, files your grievance with the Assessment Review Commission and follows it through review. You pay only if your property taxes go down.
No upfront feeARC window opens January 4, 2027Filing and ARC review included
Start with the property
Check your potential savings
Enter the address to find the Nassau County record and see whether the home should move into a deeper grievance review before the January window.
No credit card is required. An address check does not file an appeal. Availability depends on your property and filing year.
Mar 1, 2027
last day to grieve the 2028/29 Nassau roll with ARC
25%
of first-year savings only when Homespring succeeds
$0
upfront and no fee when there are no savings
The Nassau County process
One county window each winter
In most of Nassau County, the county Department of Assessment sets your value and the independent Assessment Review Commission (ARC) hears grievances. The Department publishes the 2028/29 tentative roll on January 4, 2027, and ARC accepts grievances from January 4 through March 1, 2027. The 2027 window has not opened yet, so now is the time to check the record and gather sales.
02
Build the evidence
We compare recent sales of similar nearby homes and document condition problems that the county value does not reflect.
03
File and represent
With your signed ARC authorization (Form AR10), we file the grievance through AROW, ARC's online system, and respond to ARC during its review, including any settlement offer.
A complete case, not a generic form
What makes a Nassau grievance persuasive
New York lets places assess at a fraction of market value, called the level of assessment. So the small number on your notice is not what the county thinks your home is worth. Divide the assessed value by the level of assessment to find the full market value the county is using. If that is more than your home would sell for, you may be over-assessed.
See what evidence helps a property tax appealComparable sales
Recent sales of similar homes nearby that sold for less than the full market value the county assigned to yours.
Property-record accuracy
Square footage, bedrooms, baths, finished basement, lot and other details on the county record that may overstate value.
Condition and flood exposure
Dated photos and repair estimates for an aging roof, water damage or other problems, plus flood zone or storm history where it affects price.
A specific requested value
A clear market value the sales support, which becomes your estimate on the application and the basis for the lower assessment.
Compare the options
Filing is free. Representation is the service.
Nassau County does not charge homeowners to file with ARC, and you can file yourself through AROW or on paper Form AR1. Hire Homespring if you would rather hand off the research, the filing and the back and forth with ARC, with a fee only when your taxes go down.
What you receiveFile yourselfHomespring
Nassau ARC filing fee$0$0
Record review and comparable salesYou prepareIncluded
AROW application and evidenceYou prepareIncluded
ARC review and settlement offersYou handleIncluded
Service fee$025% of first-year savings if successful
New York homeowner feedback
Reviews tied to real Homespring appeals
Verified New York homeowner
“The overall experience was strong. I had one minor delay getting a document together on my side, but once it was uploaded everything moved along smoothly.”
Brenda Y.
Verified New York homeowner
“The platform was clear and the process felt dependable. We did not end up with a dramatic dollar result, but I still felt the work was handled professionally from beginning to end.”
Frank D.
Verified New York homeowner
“My biggest concern was whether this would turn into another half-finished online form. It did not. The follow-through was consistent and the end result was better than I expected.”
Helen P.
Nassau County property tax grievance questions
Does my city or village have its own grievance process?
Most Nassau homeowners grieve with the county Assessment Review Commission. The cities of Glen Cove and Long Beach, and some villages such as Freeport, also set their own assessments. ARC says filing with it does not protect your right to challenge a city or village assessment, so those need their own filing by their own deadline.
When is the next Nassau County grievance deadline?
The 2026 ARC window is closed. The next one opens January 4, 2027, when the Department of Assessment publishes the 2028/29 tentative roll, and closes March 1, 2027. ARC says no extension is available after the deadline unless it announces one on its website.
I live in Freeport. Is my deadline different?
Yes, for the village part of your taxes. The Village of Freeport accepts grievances from November 1 until 8 p.m. on the third Tuesday of November, which is November 17, 2026. The application must physically reach the village Assessor's Office by then. A postmark is not enough. Your county ARC filing is separate.
Can I file a Nassau grievance myself?
Yes. Filing with ARC is free when you represent yourself, through AROW online or on paper Form AR1 for a one, two or three family home. Homespring is for homeowners who want the research, filing and follow-up handled. To act for you, ARC requires an owner-signed authorization, Form AR10, for each tax year.
How does Homespring charge?
There is no upfront fee. If Homespring lowers your property taxes, the fee is 25% of the first year's tax savings. If there are no savings, there is no fee.
What happens after ARC decides, and when do I save?
ARC can lower your assessment or leave it unchanged. It does not raise it because you filed. For the 2028/29 roll, ARC sends final decisions by March 31, 2028, and a reduction shows up on the October 2028 school tax bill and the January 2029 general tax bill. If you disagree, homeowners can ask a court for Small Claims Assessment Review (SCAR) on their own by May 1, 2028. Homespring's service covers the ARC grievance, not SCAR.
Get ready before the January 4 window opens
Start with the address. Homespring will check the Nassau County record and whether the home should move into a grievance review. An address check does not file an appeal. Availability depends on your property and filing year.