Nassau's ARC vs. Suffolk's Town-by-Town Grievance Process
What's the difference between Nassau's ARC and Suffolk's grievance process?
Nassau County assesses property countywide and routes initial grievances through the Assessment Review Commission (ARC), a single administrative body. Suffolk County has no countywide assessor — each of its ten towns maintains its own assessment roll and its own Board of Assessment Review, so the process, forms, and filing window can differ from one Suffolk town to the next.
One Assessor vs. Ten
The structural difference between the two counties starts with who does the assessing. Nassau County has a single Department of Assessment covering the entire county, producing one countywide assessment roll. Suffolk County has no equivalent countywide office — assessment is a town function, so Babylon, Brookhaven, Huntington, Islip, Smithtown, and Suffolk's other towns each maintain their own roll and their own review process.
Nassau: ARC as the Gatekeeper
In Nassau, a property owner who wants to challenge an assessment files with the Assessment Review Commission, an administrative agency separate from the Department of Assessment that reviews the challenge and can adjust the assessment before it becomes final. ARC operates on its own countywide filing calendar.
Suffolk: The Town Board of Assessment Review
In Suffolk, the equivalent first step is filing with the individual town's Board of Assessment Review (BAR), typically around what's commonly called Grievance Day for that town. Because each town runs its own calendar and process, a homeowner needs to confirm the specific filing window and procedure with their own town assessor's office — what applies in one town doesn't necessarily apply next door.
What Happens After the Initial Review
In both counties, if the initial administrative review doesn't produce a satisfactory result, an owner-occupied one-, two-, or three-family home generally has access to Small Claims Assessment Review (SCAR) as the next step. SCAR is a state-level process that works similarly regardless of county, but reaching it starts from a different administrative door depending on where the property sits.
Why the Difference Matters in Practice
Because Suffolk's system is decentralized, information that applies to a friend's or relative's experience in one town — deadlines, required forms, whether electronic filing is available — may not carry over to a different Suffolk town, or to Nassau at all. Confirming the specific process with the correct office, rather than relying on a general sense of how it works, avoids missing a narrow filing window.
When it is worth a call
- You're not sure which system applies to a specific property
- You've moved between Suffolk and Nassau and aren't sure how the process changed
- You want help confirming your town's specific filing window in Suffolk
- You're preparing an ARC filing in Nassau
Common questions
- Does Nassau County use Grievance Day?
- Not in the same sense Suffolk towns do. Nassau's process runs through ARC on a countywide calendar rather than a single town-based Grievance Day.
- Can I file with ARC if my property is in Suffolk County?
- No, ARC only handles properties within Nassau County. A Suffolk property goes through that property's own town Board of Assessment Review.
- Is the evidence needed the same in both counties?
- Broadly, yes — comparable sales, appraisals, and documentation of factual errors are useful in both systems — but the forms, filing procedures, and deadlines differ enough that each should be confirmed separately.
Talk it through with Mitch
Bring the situation, not a diagnosis. A short conversation usually makes the next step obvious.