DOF — Department of Finance

The New York City Department of Finance (DOF) administers the city's property tax system, generating over $30 billion annually — the single largest source of city revenue. DOF assesses the value of every property in NYC, calculates property taxes, manages exemptions and abatements, and conducts the annual tax lien sale.

For anyone involved in NYC real estate, DOF data is essential. Property tax assessments directly affect carrying costs and investment returns. Outstanding DOF balances and tax liens can block transactions and, in extreme cases, lead to foreclosure.

DOF manages property taxation across four tax classes:

• Tax Class 1: One-to-three family residential (6% assessment ratio)
• Tax Class 2: Apartment buildings, co-ops, condos (45% with phase-in caps)
• Tax Class 3: Utility company property (special rates)
• Tax Class 4: Commercial and industrial property (45% assessment ratio)

DOF also administers property tax exemptions including STAR, 421-a, J-51, ICIP, Senior Citizen, Disabled, Veterans, and nonprofit/religious exemptions.

DOF does not issue building violations, but administers critical financial processes:

• Tax lien sale: Annual sale of liens on properties with unpaid taxes, water/sewer, and other municipal charges
• Property tax bills: Semi-annual (Class 1) or quarterly (Classes 2-4)
• Notice of Property Value (NOPV): Annual assessment notice
• RPIE filing: Real Property Income and Expense reports for income-producing properties
• Transfer tax: NYC and NYS transfer taxes on property sales

Failure to pay property taxes results in interest charges (currently 18% per year for amounts under $250,000), inclusion in the annual tax lien sale, and ultimately potential foreclosure. Tax lien sale purchasers can charge 18% interest and begin foreclosure proceedings after a waiting period. DOF also imposes penalties for late RPIE filings — $100/day up to $10,000, plus the property loses its assessment cap.

RegWatch pulls daily-refreshed DOF data including assessed value, market value, tax class, annual tax amount, outstanding balances, lien status, exemptions, abatements, and historical assessment trends. Our tax liability scoring identifies properties at risk of lien sale inclusion. Portfolio monitoring alerts you to assessment changes, new liens, and approaching tax deadlines.