Kings County property is administered as the Borough of Brooklyn within New York City's assessment system. The Department of Finance sets the tentative market value, assessed value, tax class, and exemptions shown on the annual Notice of Property Value; the independent NYC Tax Commission hears timely applications to correct those determinations. The ordinary 2026/27 filing period is closed: Class 1 applications were due March 16, 2026, and Classes 2, 3, and 4 were due March 2. Those were receipt deadlines, not postmark deadlines. A qualifying later revised notice can create a separate short window, so read its date and change carefully. FairPath can organize notice facts and owner-selected evidence, but it cannot revive a missed deadline, select a Tax Commission form, or file a Brooklyn application.
Assessment context: A Brooklyn owner should begin with the 2026/27 Notice of Property Value and identify borough, block and lot, tax class, Department of Finance market value, assessed value, effective market value if shown, exemptions, and descriptive property data. Tax Class 1 generally includes one- to three-family homes; larger rentals, cooperatives, condominiums, mixed-use property, utilities, and commercial property can require different forms and evidence. Brooklyn's row houses, detached homes, small multifamily buildings, cooperative shares, condominium units, converted industrial buildings, and income-producing corridors are not interchangeable. Location within a neighborhood, building class, frontage, lot, condition, legal use, rental regulation, unit count, and income can drive value. A Request for Review or Request to Update filed with Finance addresses a different administrative task and does not replace a timely Tax Commission application.
Filing process: The correct application depends on the claim and property. The Tax Commission lists TC108 for Class 1 valuation claims, TC101 for Class 2 or 4 property other than condominiums, TC109 for Class 2 or 4 condominium units, and TC106 for classification, exemption, or other claims. Income-producing property may require TC201; a cooperative or condominium board filing may require TC203. For 2026/27, applications had to be received by the applicable 5 p.m. deadline. The Tax Commission says filing was by mail or in person, not email. Brooklyn filers could use the Department of Finance Business Center at 210 Joralemon Street, but the Tax Commission remains the deciding authority. A TC10 receipt form can document in-person delivery; mailed filings can include a self-addressed stamped TC10. Keep the complete signed application, schedules, notice, proof of receipt, and every later request or offer.
Evidence to review: Evidence must fit New York City's tax-class and valuation framework. For a Class 1 Brooklyn home, analyze sales around the relevant valuation period and explain differences in building class, width, lot, gross square footage, condition, legal units, garage, and immediate location. If the notice shows an effective market value, Finance warns that the owner must establish a current market value below that figure to win the assessment challenge. Income-producing property requires disciplined rent, vacancy, operating-expense, and capitalization support on the prescribed schedules rather than a residential comparable list alone. Condominium applications have their own forms and supplemental instructions. Photographs, permits, floor-area records, appraisals, closing documents, leases, and corrected descriptions should be dated and tied to the claim. Do not confuse a property-data correction, exemption appeal, class claim, and overvaluation claim; each has distinct forms and deadlines.
Current deadline guidance: 2026/27 deadline passed: March 16 for Class 1; March 2 for Classes 2, 3, and 4. For New York City's 2026/27 assessment roll, Tax Commission applications had to be received by 5 p.m. March 16, 2026 for Tax Class 1 and by 5 p.m. March 2, 2026 for Classes 2, 3, and 4. The deadlines cannot be extended. A revised notice dated after February 1 that increases assessed value or reduces or removes an exemption can trigger a separate 20-calendar-day rule.
Kings County appeals are handled by city agencies under the Borough of Brooklyn identity; the NYC Department of Finance values property and the independent NYC Tax Commission reviews applications.
The 2026/27 deadlines moved to the next business day: March 16 for Class 1 and March 2 for Classes 2, 3, and 4, with receipt required by 5 p.m.
Brooklyn's Department of Finance Business Center at 210 Joralemon Street was an authorized in-person intake location, but it did not change the applicable Tax Commission form or deadline.
A 2026/27 application with assessed value of at least $2 million can incur the Tax Commission's $175 review fee, and higher-value filings may require additional accountant documentation.
Official filing authority: New York City Tax Commission. https://www.nyc.gov/site/taxcommission/forms/forms.page
Source: New York City Tax Commission, NYC Tax Commission, https://www.nyc.gov/site/taxcommission/. Reviewed 2026-07-16.
Source: New York City Tax Commission, Challenging Notice of Property Valuation, https://www.nyc.gov/site/taxcommission/about/challenging-notice-of-property-value.page. Reviewed 2026-07-16.
Source: New York City Tax Commission, 2026/27 Assessment Application Forms and Instructions, https://www.nyc.gov/site/taxcommission/forms/forms.page. Reviewed 2026-07-16.
Source: New York City Department of Finance, Challenge Your Property's Assessed Value, https://www.nyc.gov/site/finance/property/challenge-your-assessment.page. Reviewed 2026-07-16.