421a Tax Abatement in NYC: What Every Buyer & Seller Should Know

Navigate NYC real estate with confidence. Our guide to the 421-a tax abatement explains the rules, benefits, and which buildings still have this property tax-saving program.
Tony InJe Yeo's avatar
Nov 11, 2025
421a Tax Abatement in NYC: What Every Buyer & Seller Should Know

421a Tax Abatement in NYC: What Every Buyer & Seller Should Know

For decades, the 421-a tax abatement was one of the most talked-about and sought-after incentives in New York City real estate. While the program has now expired, its legacy lives on in thousands of condo, co-op, and rental buildings across the five boroughs. For anyone looking to buy, sell, or rent in NYC, understanding what a 421-a tax abatement is and how it works is essential.


What Is the 421-a Tax Abatement?

The 421-a tax abatement was a New York City property tax exemption program designed to encourage residential development. Enacted in 1971, the program offered developers a significant reduction in property taxes for building new multi-family housing. The primary goal was to stimulate new construction, particularly during periods of economic downturn when building was less financially viable.

In exchange for the tax break, developers were required to meet certain criteria, which evolved over the years. The most recent iteration, known as the "Affordable New York" program, required developers to include a percentage of affordable units in their projects to be eligible for the benefit. The tax exemption applied to the increased assessed value of the property resulting from the new construction, not the land itself.


How Does a 421-a Abatement Work?

The 421-a tax benefit is not a permanent exemption. It’s a temporary program that reduces or eliminates property taxes for a set number of years, typically 10 to 35, depending on when the building was completed and its location. The abatement phases out over time, meaning the property taxes gradually increase until they reach their full amount.

Here's a simplified look at a common 15-year phase-out schedule, although specific schedules vary by building and the version of the law it was built under:

  • Years 1-11: 100% tax exemption on the increase in assessed value.

  • Year 12: 80% exemption.

  • Year 13: 60% exemption.

  • Year 14: 40% exemption.

  • Year 15: 20% exemption.

  • Year 16 and beyond: Full property taxes are due.

For buyers, this means you enjoy significantly lower property taxes for a period, which can dramatically reduce your monthly carrying costs. However, it's crucial to understand the remaining term of the abatement. The closer a building is to the end of its abatement period, the more important it is to factor the future, full tax bill into your budget.


Is the 421-a Program Still in Effect?

No. The most recent version of the 421-a program, the "Affordable New York" housing program, expired on June 15, 2022. This means that no new construction projects can apply for or receive a 421-a tax abatement.

However, any buildings that were already approved for the program before the 2022 deadline continue to receive the tax benefits for the remainder of their designated abatement period. This is why you will still see many new and recently built buildings with an active 421-a abatement.

The expiration of the program has been a major point of contention in the real estate industry, with discussions ongoing about a potential replacement program.


FAQ for Buyers & Sellers

For Buyers: How Do I Know if a Building Has a 421-a Abatement?

Since the program is no longer active for new projects, the best way to determine if a building has an abatement is to check for yourself. While there is no single, comprehensive public database for all buildings with a 421-a abatement, you can find this information through official channels and due diligence:

  • NYC Department of Finance (DOF) Website: The most reliable source. You can search for a specific property's address on the NYC Department of Finance website's property search tool. The property's tax bill and other details will show if a tax benefit, like a 421-a, is in effect and for how long.

  • Building's Offering Plan: When a new condo or co-op is first sold, the offering plan is a public document that details every aspect of the project, including the tax abatement schedule.

  • Listing Descriptions: Real estate listings for condos with a tax abatement almost always highlight it as a key selling point.

For Sellers: What Does It Mean to Sell a Building With an Abatement?

For sellers, having an active 421-a abatement is a major advantage. It makes your property more attractive to potential buyers because of the lower carrying costs. When selling, be prepared to:

  • Provide the Abatement Schedule: Share the official schedule, including the start date and the phase-out timeline, so buyers can accurately calculate their future tax burden.

  • Market the Low Taxes: Clearly state the current property tax amount and the benefits of the abatement in your marketing materials.

  • Anticipate Questions: Be ready to answer questions about when the abatement expires and what the full tax amount is expected to be.


Tips & Takeaways

  • A 421-a abatement is not a forever deal. It's a temporary tax reduction, and understanding its expiration date is crucial for long-term financial planning.

  • The benefit applies to the assessed value of the building, not the land. As the exemption phases out, you will eventually pay full taxes on the entire property's assessed value.

  • Rent Stabilization: Many rental buildings with a 421-a tax abatement are subject to rent stabilization during the abatement period. This is a key benefit for renters in these buildings, as it limits annual rent increases.

  • Due Diligence is Key: Never take a listing's word for it. Always verify the existence and terms of a 421-a abatement with official NYC government records before making an offer.

Navigating the complexities of New York City real estate requires a trusted and knowledgeable partner. At Yeo Real Estate, we specialize in helping buyers, sellers, and renters understand the intricate details of the market, including tax abatements and other financial factors. **** Contact us today to learn how our expert guidance can help you achieve your real estate goals.

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