New Study Puts Mamdani Child Care Plan at $9 Billion a Year, 50% Above His Campaign Number

Mayor Zohran Mamdani built his campaign on a promise: free, universal child care for every New York City kid from 6 weeks old to age five, funded by taxing the wealthy. A new independent analysis says that promise is going to cost far more than advertised.

The Center for New York City Affairs, a nonpartisan research group affiliated with The New School, released a report Monday estimating the full program would run $8.7 to $9.3 billion a year. That's roughly $3 billion more than the $6 billion figure Mamdani used on the campaign trail, according to the New York Post.

The average cost per child comes out to about $27,000 a year under the model, the Center's report shows.

Much of the gap traces to staffing. The Center's researchers project the city would need to hire around 23,000 new childcare workers, most of them to serve infants and children under three, plus create roughly 10,000 new seats for kids younger than pre-K age.

The Center's model isn't a one-off guess. It's built from population data by age, state-mandated staffing ratios, and real operating cost and workforce data, and the group says it plans to release a public online version so policymakers and advocates can run their own scenarios. A webinar walking through the findings is scheduled for Thursday, August 20.

The report also flags a pattern that should worry anyone tracking the city budget: New York consistently lowballs what these programs actually cost once they're running. The city budgeted $2.5 billion for childcare services in fiscal year 2025 and ended up spending $3.8 billion. The researchers call this "emblematic of the regular under-estimation of service delivery costs" and warn the city will need to find an additional $4.9 to $5.5 billion just to sustain a fully universal system once it's built out.

That history matters here. If the city missed its own childcare budget by $1.3 billion in one fiscal year on a much smaller existing program, a mayor's promise to nearly double the system's scope for only 50% more money deserves real skepticism.

City Hall has not released its own official cost model for the program and declined to comment on the $9 billion figure when asked, according to the Post. That's a problem. A policy this size, funded by a specific tax scheme aimed at the state's highest earners, needs a public number the administration is willing to defend, not silence when an outside estimate lands 50% above the sales pitch.

The funding plan itself remains murky. Mamdani has said the tax burden should fall on wealthy New Yorkers, but that requires action in Albany, not City Hall. Governor Kathy Hochul has committed $1.2 billion to kickstart pilot programs in select neighborhoods and says she intends to keep funding it. But Hochul said in January that money would come from "existing" state revenues, not new taxes, and specifically ruled out the wealth tax Mamdani and his supporters wanted.

The city already runs free pre-K for 3- and 4-year-olds and is expanding limited 2-K seats this fall, so a phase-in toward full universality isn't starting from zero.

But a phase-in is not what Mamdani sold voters. He promised a fully universal system at a specific price tag, and independent researchers now say that price tag is off by billions. The Center for NYC Affairs report explicitly says rolling out the full program is "essentially impossible" without major support from both state and federal government, support that, as of today, does not exist at anywhere near the scale required.

The unresolved question is simple: where does the extra $3 billion a year, and potentially another $5 billion beyond that to sustain the system, actually come from? Until City Hall publishes its own cost model or Albany and Mamdani reconcile their competing funding visions, that number stays open. New Yorkers won't know the real price of universal child care until someone in charge is willing to put one on paper.