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NYC New-Development Tax Abatements (421-a and 485-x): How Much Do You Actually Save?

By Christina (Yan Xue) Zheng · May 30, 2026 · 8 min read

NYC New-Development Tax Abatements (421-a and 485-x): How Much Do You Actually Save?

Brian W. Schaller — FAL · Wikimedia Commons

You walk into a brand-new condo, the numbers pencil out, and then you notice the monthly property tax line is surprisingly small — sometimes a fraction of what a similar older apartment a block away pays. That gap is almost always a tax abatement, and in New York it usually has a name and an expiration date. Understanding it is the difference between a real bargain and a payment that quietly balloons a few years after you move in.

This guide explains what the 421-a program did, the 485-x program that replaced it in 2024, how an abatement actually lowers your tax bill, what to verify before you sign, and how it all plays out when you go to sell.

As of June 2026. Property-tax rules, program deadlines, and assessment figures change frequently, and the City sets new tax rates each year. Verify any specific number against NYC HPD, the NYC Department of Finance (DOF), and the current building documents before relying on it.

What 421-a actually did

Section 421-a of the New York Real Property Tax Law dates to 1971. Its purpose was to encourage residential construction by exempting the new value a developer builds from property tax for a set number of years. In plain terms: the city keeps taxing the land roughly as it was before, but the value of the new building on top is exempted — partially or fully — for the benefit period.

Its last major version, renewed in 2017 and branded "Affordable New York," typically ran for a 35-year benefit in enhanced-affordability areas: full (100%) exemption for the first 25 years, then a phase-out over the final 10 years, with affordability requirements that ran longer still. Older versions of 421-a came in 10-, 15-, 20- and 25-year flavors, which is why two new-ish buildings can have very different abatement clocks.

Crucially, 421-a stopped accepting new projects after June 15, 2022. It was not renewed. But thousands of existing buildings still carry active 421-a benefits, and projects that broke ground before the cutoff were later given until June 15, 2031 to finish construction and still qualify. So you will keep seeing "421-a" on listings for years.

485-x: the 2024 replacement

In April 2024, New York State enacted a successor program, Real Property Tax Law Section 485-x, marketed as "Affordable Neighborhoods for New Yorkers" (ANNY). It is administered by NYC HPD and applies to projects that commence construction between June 16, 2022 and June 15, 2034, with a construction-completion deadline of June 15, 2038.

485-x is built around tiers that scale benefits to project size and affordability. Per HPD and legal summaries, rental tiers include:

Project typeAffordabilityBenefit length
Very large (150+ units, designated zones)25% of unitsConstruction period + 40 years at 100%
Large (100+ units)25% of unitsConstruction + 35 years at 100%
Modest (6–99 units)20% of unitsConstruction + 35 years (25 at 100%, then 10 at the affordability share)
Small (6–10 units, outside Manhattan)None requiredConstruction + 10 years at 100%

For homeownership (condo/co-op) projects, the relevant track requires 6+ units located outside Manhattan, with every unit averaging an assessed value of no more than $89 per square foot, a 5-year owner-occupancy requirement, and a 20-year exemption. The headline takeaways versus 421-a: deeper affordability requirements, longer top benefits (up to 40 years), and — importantly for buyers — the condo track is geographically limited and capped on assessed value, so brand-new abated condos under 485-x will concentrate outside Manhattan.

How an abatement lowers your tax — and then doesn't

The mechanics matter because the savings are not permanent. An abatement reduces the taxable assessed value of your unit; your annual bill is that assessed value times the City's Class 2 tax rate (set each year by DOF). While the benefit is at 100%, the new-construction value is largely shielded and the tax line is small.

Then it phases out. Depending on the program version, the exemption steps down over the back end of the term — for example dropping in increments until the building reaches its full, unabated tax. When the benefit fully expires, the unit is taxed on its full assessed value like any other Class 2 condo. In practice that can add several hundred to a couple thousand dollars a month to carrying costs, which is why the phase-out schedule is not a footnote — it is the whole story.

A quick vocabulary note: people say "abatement" loosely, but 421-a and 485-x are technically exemptions (they reduce taxable value). NYC also has true abatements (such as the co-op/condo property tax abatement and J-51) that reduce the tax owed directly. Different programs, different rules, sometimes stacked on the same unit.

What buyers should check before signing

Treat the tax line on a new-development offering as a temporary number and ask for the details in writing:

  • Which program and which version? 421-a (and which year/term) or 485-x changes the length and the phase-out.
  • How many years are left? A 25-year benefit that started in 2014 is more than half gone. The remaining runway is what you're actually buying.
  • What does the phase-out schedule look like, year by year? Get the projected tax for the first year, the step-down years, and the first fully-taxed year — not just today's number.
  • Is there a separate co-op/condo abatement? It has its own primary-residence rules and can change if you rent the unit out.
  • Verify independently. A unit's exemption status and assessed value are on its NYC DOF property tax bill and Notice of Property Value — look them up rather than relying on a brochure.

Our team can walk through a specific building's tax documents with you; contact our team and we'll pull the DOF records together. You can also browse current listings and new developments to compare how abatements are disclosed.

Resale impact

An active abatement cuts both ways. While the benefit is healthy, it's a selling point: lower carrying costs make a unit easier to market and can support price. But buyers are increasingly savvy about the expiration cliff. A unit two years from full taxation is worth less, all else equal, than the same unit with 15 years of benefit left, because the next owner inherits the rising-tax schedule. If you buy near the end of a phase-out, model the post-abatement bill into your hold and your eventual exit — and price accordingly when you sell.

The bottom line: a tax abatement is a real, often substantial saving, but it is a clock, not a permanent feature. Know which program applies, how many years remain, and what the bill looks like the day after it ends.

Disclaimer. This article is general educational information, not legal, tax, financial, or investment advice. Tax programs, deadlines, rates, and eligibility rules change, and individual buildings differ. Verify any specific figure with NYC HPD, the NYC Department of Finance, the building's offering documents, and a licensed attorney, tax professional, or real-estate professional before making decisions.

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