New York’s state legislature approved a two-year extension of New York City’s class-size law on June 1, 2026, giving the nation’s largest school system until the 2029-30 academic year to fully comply with the 2022 mandate to shrink classes — and pairing the delay with a new deal that pays teachers stuck in oversized classrooms thousands of dollars more.

A slower phase-in

The 2022 law, signed by Gov. Kathy Hochul, caps New York City class sizes at 20 students in grades K-3, 23 in grades 4-8, and 25 in high school. It was supposed to phase in over five years, reaching full compliance by 2027-28. The law had called for 80% of classes to comply by fall 2025.

The June extension resets that timeline. Under the revised schedule, 70% of classes must be in compliance this school year, with an additional 10% added in each of the next three years — pushing the finish line to 2029-30.

The shift follows a year in which the city met interim targets only by leaning on exemptions. To clear a 60% compliance bar, officials declared roughly 10,500 of the city’s more than 150,000 classes exempt; without those carve-outs, compliance sat closer to 64%.

The UFT pay differential

Tied to the extension is a separate agreement between the United Federation of Teachers and the Education Department. Teachers whose classes remain above the caps can become eligible for additional pay: up to $8,500 in the first year and $9,500 in the second.

The union was careful to note the money is not universal. “Not every teacher whose class is out of compliance with the class size limits will receive the differential,” the UFT said, adding that distribution will be determined each November based on a school’s economic need.

UFT President Michael Mulgrew framed the trade-off as pragmatic. “If giving this new administration two more years gets us a partner committed to building the necessary seats, then it is the fastest way to turn the law into reality,” he said.

The mayor’s case

Mayor Zohran Mamdani backed the extension, saying it “gives our schools the opportunity to reduce class sizes in a way that is sustainable and responsible.” His administration had tied the broader question of mayoral control — extended through June 2028 in the late state budget — to its ability to meet the class-size mandate.

The financial logic is hard to miss. The city had already spent roughly $400 million and hired about 3,700 teachers to hit early targets, and reaching 80% compliance was projected to cost an additional $687 million to $782 million in operating costs. City officials estimated the delay saves hundreds of millions of dollars, money that helps address a multibillion-dollar budget gap.

What’s still unresolved

The central tension the law was meant to address remains: smaller classes require more teachers and more classrooms, and the city’s building stock and budget have not kept pace. Advocates who pushed the 2022 cap have warned that exemptions and extensions risk hollowing out the mandate, while administrators have argued the original timeline was never realistic given space and staffing constraints.

The two-year delay buys time but not a solution. By 2029-30, the city will still need to bring the vast majority of its classes under the caps — a target that, on current spending, runs well into the billions.

Verification

Frequently Asked Questions

What is the 2022 class-size law?
A state law signed by Gov. Kathy Hochul in September 2022 capping NYC class sizes at 20 students in grades K-3, 23 in grades 4-8, and 25 in high school, phased in over several years.
What did the June 2026 extension change?
It pushed full compliance from the 2027-28 school year to 2029-30. The revised schedule requires 70% of classes to comply this school year, then an additional 10% in each of the next three years.
What do teachers in oversized classes get?
Under a separate UFT–DOE agreement, eligible teachers in classes above the caps can receive a differential of up to $8,500 next school year and $9,500 the following year. Not every teacher in an out-of-compliance class qualifies; distribution is set each November based on school economic need.
Why did the city want more time?
Compliance is expensive — the city had spent about $400 million and hired roughly 3,700 teachers to reach interim targets, with far more needed. Officials said the delay saves hundreds of millions amid a multibillion-dollar budget gap.