How to Challenge Your NYC Property Tax Assessment: A Step-by-Step Guide to Filing a Tax Commission Appeal

Every January, the NYC Department of Finance mails property owners an Annual Notice of Property Value (NOPV). Most New Yorkers glance at it, set it down, and forget about it. That’s a costly mistake. If the city has overestimated your property’s assessed value — even slightly — you could be paying hundreds or thousands of dollars more in property taxes than the law requires.

The good news: New York City has a formal process for challenging that number, entirely separate from the Department of Finance. It’s called the NYC Tax Commission, and filing an appeal with it is one of the most underused, most legitimate ways a NYC property owner can reduce their tax bill.

This guide walks you through how the process works, which forms to file, what the deadlines are, and what happens after you submit your application.

What Is the NYC Tax Commission?

The NYC Tax Commission is an independent city agency — separate from the Department of Finance — authorized under New York State and local law to review real property tax assessments. It is not the same office that set your assessment. The Commission comprises a president and six commissioners, all appointed by the Mayor with City Council consent, each serving staggered six-year terms. Every member must have at least three years of business experience in real estate or real estate law.

That independence matters. When you file with the Tax Commission, you’re not asking Finance to reconsider its own work. You’re asking a different body — one with its own hearing officers, its own guidelines, and its own authority under NYC Administrative Code §11-201 et seq. and New York Real Property Tax Law (RPTL) — to evaluate whether the assessment is correct.

The Tax Commission can review four types of claims:

1. Wrong tax class — your property is classified under the wrong tier (Class 1, 2, 3, or 4)
2. Assessment too high — the assessed value exceeds the property’s actual market value
3. Inequality — your property is assessed at a higher proportion of market value than comparable properties in the same class
4. Unlawfulness — your property was improperly denied a full or partial exemption from real property tax

Note what the Commission cannot do: it cannot change the property tax rates set by the City Council. It can only correct the assessed value or tax class that those rates are applied to.

Start Here: Read Your Notice of Property Value

Your Annual Notice of Property Value, mailed each January by the NYC Department of Finance, is the document that triggers your right to appeal. Page 3 of that notice tells you whether you have grounds to file and which form applies to your situation.

Before filling out anything, read Form TC600 — “How to Appeal a Tentative Assessment.” The Tax Commission itself calls this essential reading. TC600 explains the four-class system, which forms apply to which property types, income-and-expense requirements for Class 2, 3, and 4 properties, and the filing rules. You can download TC600 from the Tax Commission’s forms page at nyc.gov/site/taxcommission/forms/forms.page.

Filing Deadlines: Mark These Dates for 2027

The deadlines to appeal are set by the NYC City Charter and are absolute. The Tax Commission states plainly: these deadlines cannot be waived or extended for any reason.

For the 2026/27 tax year, the deadlines were:

• Class 2, 3, and 4 properties: 5:00 PM on March 2, 2026
• Class 1 properties: 5:00 PM on March 16, 2026

Those windows have closed for this cycle. But if you missed 2026, the time to act is now — before January 2027 when the next cycle begins. When your new NOPV arrives in the mail, you’ll have roughly six weeks (Class 2/3/4) or eight weeks (Class 1) to decide and file.

Mark your calendar for early January 2027: open that NOPV the day it arrives, read page 3, and decide within days whether the numbers look wrong.

Filing in 2026: In Person or By Mail Only

Beginning with the 2026/27 cycle, the Tax Commission is not accepting applications by email. All filings must be submitted in person or by mail. This is a policy change from prior years when electronic submission was sometimes available. Plan accordingly: if you miss the postal window, you lose the appeal for that tax year.

The Tax Commission’s office is located at:

1 Centre Street, Room 2400, New York, NY 10007

For general questions, call the Tax Commission at (212) 669-4410.

Which Form Do You File?

The Tax Commission uses different application forms depending on what kind of property you own. Here is the basic breakdown for 2026/27:

Class 1 Properties (1–3 family homes, small condos)

• Form TC101 — Application for Correction of Assessed Value of Real Property (Class 1)
• Class 1 properties are valued by DOF using comparable sales, not income. Your appeal should focus on the accuracy of those comparable sales and the property’s condition.

Class 2 Properties (rental buildings, co-ops, condos with 4+ units)

• Form TC201 — Application for Correction (income-producing residential property)
• Form TC203 — Income and Expense Schedule (required with TC201 for most income-producing properties)
• Class 2 income-producing properties require you to submit income and expense data. The Tax Commission’s hearing officers will compare your numbers to the agency’s published capitalization rate guidelines for your neighborhood and property type.

Class 4 Properties (commercial, office, retail, industrial)

• Form TC109 — Application for Correction (commercial/industrial property)
• Form TC214 — Income and Expense Schedule for commercial properties
• For Class 4, the assessed value threshold for filing a Form TC309 (required for larger properties seeking formal review) increased to $5,400,000 for the 2026/27 tax year under NYC Administrative Code §11-216.b(2)(d).

Important: The New $175 Filing Fee

For the 2026/27 cycle, the Tax Commission adopted a rule imposing a $175 fee on applications where the assessed value on the NOPV is $2 million or more. If multiple condominium units file on a single application, the fee applies if the aggregate assessed value hits $2 million. The fee is not paid with your application — it will be added to your real property tax bill by the Department of Finance. There is no fee if you waive review before your application is scheduled for hearing. If the fee goes unpaid, the Tax Commission may deny your review and revoke any offer of correction already made.

What Happens After You File

Once you submit a complete application by the deadline, here is what the process looks like:

1. Administrative Review

The Tax Commission assigns your application to a hearing officer. For Class 1 properties, the review is often administrative — meaning no in-person hearing is required unless the officer needs more information or finds the matter unusually complex.

2. Income and Expense Review (Class 2 and 4)

If you own income-producing property, the hearing officer compares your reported income and expenses to the Commission’s published capitalization rate guidelines. These guidelines are updated annually and vary by property type, borough, and neighborhood — the Commission publishes separate rate tables for Manhattan offices, Manhattan retail, outer borough retail, industrial, residential, and hotels. The 2026/27 guidelines are available at the Commission’s website. Remember: the guidelines are an aid, not a hard rule. The hearing officer’s judgment and your specific property’s data take precedence.

3. Offer of Correction

If the hearing officer concludes your assessment should be lowered, the Commission will issue an Offer of Correction — a proposed reduced assessed value. You can accept it or reject it. If you accept, the reduction is applied to your tax bill. If you reject it (perhaps because the reduction wasn’t large enough), you can proceed to formal hearing or, ultimately, to Small Claims Assessment Review (SCAR) or Tax Certiorari proceedings in court.

4. Formal Hearing

You can request a formal hearing before a Tax Commission commissioner. This is typically done by larger property owners or those whose cases involve significant disputed value. Attorneys and real estate professionals frequently represent clients at this stage.

5. After the Tax Commission: SCAR and Certiorari

If you exhaust the Tax Commission process without a satisfactory result, you have two further options:

• Small Claims Assessment Review (SCAR) — available to Class 1 homeowners and owner-occupied Class 2 properties with 3 or fewer units. SCAR is heard by the New York State court system, not the city. It is designed for property owners who do not want to hire an attorney. The filing fee is $30. You file in the Supreme Court of the county where your property is located.
• Tax Certiorari (Article 7 RPTL proceeding) — available to all property types. This is a formal court action under New York Real Property Tax Law Article 7, typically handled by attorneys specializing in real estate tax. It is the route used by major commercial landlords and large co-op/condo boards.

What the Tax Commission Cannot Do

A few important limits to understand before you file:

• It cannot change your property description. If DOF has your square footage, building age, or lot size wrong, you need to submit a correction request to the Department of Finance directly — not the Tax Commission. Use DOF’s property data update form at nyc.gov/site/finance/taxes/property.page. A descriptive correction request does not substitute for a timely Tax Commission application.
• It cannot adjust your tax rate. The rates set by the City Council each year are outside the Commission’s jurisdiction.
• It cannot handle bills, liens, or delinquent interest. Those issues go to the Department of Finance directly. Call DOF at (212) 440-4040.
• It cannot extend its own deadlines. The March deadlines are set by the City Charter. No hardship, illness, or oversight changes them.

A Practical Timeline for Class 1 Homeowners

If you own a one-to-three-family home in New York City, here is the year-round rhythm that keeps you in control of your assessment:

Tips for Strengthening Your Appeal

Pull comparable sales yourself. The NYC Department of Finance publishes the Rolling Sales dataset for every borough — a free spreadsheet of every arm’s-length sale in the city. If comparable homes on your block sold for meaningfully less than the city’s estimated market value for your property, print those comps and include them with your TC101.

Document every physical defect. If your home has a structural issue, outdated systems, or deferred maintenance that a comparable “average” home would not, photograph it. Condition affects market value, and market value affects assessed value.

Don’t confuse assessed value and market value. For Class 1 properties, DOF targets an assessed value equal to 6% of the estimated market value. If DOF estimates your home’s market value at $800,000, the assessed value should be around $48,000. A common mistake is appealing the assessed value figure itself rather than the underlying market value estimate that produces it.

For income properties, keep meticulous records. The Tax Commission’s hearing officers for Class 2 and 4 properties live in the income and expense data. If your actual income and expenses show a lower net operating income than DOF assumed, your capitalized value — and thus your assessed value — should be lower. TC203 and TC214 are the vehicles for making that case.

Key Resources

• NYC Tax Commission: nyc.gov/site/taxcommission
• Tax Commission phone: (212) 669-4410
• Tax Commission address: 1 Centre Street, Room 2400, New York, NY 10007
• Form TC600 (How to Appeal): nyc.gov/site/taxcommission/forms/forms.page
• Form TC101 (Class 1 application): same forms page
• NYC Department of Finance (property tax): nyc.gov/site/finance/taxes/property.page
• DOF phone: (212) 440-4040
• NYC Admin Code §11-201 et seq. — statutory authority for the Tax Commission
• NY Real Property Tax Law Article 7 — governing Tax Certiorari proceedings

Tax advice in this article is informational. Consult a tax professional or the NYC Department of Finance for your specific situation.