Suffolk County property taxes are among the highest in the nation, with effective tax rates often exceeding 2% of market value. If your property is over-assessed, filing a grievance can reduce your tax bill significantly. Here is exactly how the process works.
How Suffolk County Assessments Work
Each of Suffolk County's 10 towns maintains its own tax assessor who determines property assessments. The towns are: Babylon, Brookhaven, East Hampton, Huntington, Islip, Riverhead, Shelter Island, Smithtown, Southampton, and Southold.
Assessment practices vary by town. Some towns assess properties at a percentage of market value using an equalization rate (also called the Level of Assessment or LOA). For example, if a town's equalization rate is 0.50% and your property's market value is $500,000, the assessed value should be approximately $2,500.
You can find your town's current equalization rate on the NYS Department of Taxation and Finance website at tax.ny.gov.
Step 1: Review Your Assessment
Check your property's assessment on your town assessor's website or the Suffolk County Real Property Tax Service Agency (RPTSA) portal. Key figures to review:
- Assessed Value: The value assigned by the assessor
- Market Value: Assessed value divided by the equalization rate — this is what the assessor thinks your property is worth
- Property Class: Residential, commercial, vacant, etc.
- Exemptions: STAR, veterans, senior citizens, etc.
If the implied market value is higher than what your property would actually sell for, you have grounds for a grievance.
Step 2: Gather Evidence
The strongest evidence for residential properties includes:
- Comparable sales: 3–5 recent sales (within the past 1–2 years) of similar properties in your area that sold for less than your implied market value
- Recent appraisal: A licensed appraiser's opinion of value carries significant weight
- Property condition issues: Document needed repairs, structural problems, environmental issues (flood zone, contamination), or functional obsolescence
- MLS listings: Properties similar to yours that are listed or sold below your assessed market value
For commercial and investment properties, an income approach — using actual rental income and expenses to derive value via a capitalization rate — is often more effective than comparable sales.
Step 3: File the Grievance (Assessment Review Board)
File NYS Form RP-524 (Complaint on Real Property Assessment) with your town's Board of Assessment Review (BAR). Key details:
- Filing deadline: The third Tuesday of May in most Suffolk County towns (this is called "Grievance Day"). Check with your specific town assessor for the exact date, as some towns have different schedules.
- Where to file: The town assessor's office. Some towns accept online or mail filings; others require in-person delivery.
- Supporting documents: Attach your comparable sales data, appraisal, photographs, and any other evidence supporting your claim of overvaluation.
The BAR will review your application and may schedule a hearing. You or your representative should attend to present your case.
Step 4: BAR Decision
The BAR issues its decision after Grievance Day. If the BAR grants a reduction, the new assessment takes effect for the current tax year. If the BAR denies your grievance or grants an insufficient reduction, you have further options.
Step 5: Small Claims Assessment Review (SCAR)
If the BAR denies your grievance, residential property owners (1–3 family, condos, vacant residential lots under 10 acres) can file for Small Claims Assessment Review (SCAR) in NYS Supreme Court. SCAR is an informal hearing process:
- Filing deadline: 30 days after the BAR filing deadline
- Filing fee: $30
- No attorney required: SCAR is designed for property owners to represent themselves
- Hearing: A hearing officer reviews your evidence and the assessor's evidence, then issues a decision
SCAR decisions can be appealed to State Supreme Court, but this is rare for residential properties.
Step 6: Tax Certiorari (For Larger Properties)
Owners of commercial, industrial, or high-value properties can file a Tax Certiorari proceeding in NYS Supreme Court instead of (or after) SCAR. This is a formal legal proceeding and typically requires an attorney. Many tax certiorari attorneys work on contingency — typically 25–40% of the first year's tax savings.
Important Tips
- File every year. Assessment reductions are not permanent. If market conditions change or the town adjusts assessments, your reduction may not carry forward automatically.
- Check your STAR exemption. Make sure you are receiving the Basic STAR or Enhanced STAR exemption if you are eligible. A missing STAR exemption can add $500–$1,500 to your annual tax bill.
- Watch for town-wide reassessments. When a town conducts a reassessment, all assessments reset. Your prior grievance reduction is wiped out, and you may need to file again.
- Consider hiring a grievance company. Several firms in Suffolk County specialize in tax grievances and work on contingency. They handle all paperwork and appearances for a percentage of the savings (typically 40–50% of the first year's reduction).
How RegWatch Helps
RegWatch provides assessment data and comparable sales for Suffolk County properties, giving you the evidence you need for a successful grievance. Look up any Suffolk County property or sign up free for full access.