New York's Millionaire Exodus Is Costing Billions In Lost Revenue

Mayor Zohran Mamdani stood outside Ken Griffin's $238 million Manhattan penthouse in April and declared victory. "When I ran for mayor, I said I was going to tax the rich. Well, today we're taxing the rich," he said in a social media video marking the debut of New York City's first pied-à-terre tax, an annual fee on luxury properties worth more than $5 million whose owners do not live in the city full time. He promised the tax would raise "at least $500 million directly for the city," money he said would fund free child care, cleaner streets, and safer neighborhoods. "This is a fundamentally unfair system that hurts working New Yorkers," Mamdani said. "Now it's coming to an end."

BREAKING: Mamdani announces new tax on all property worth over $5 million if the owner doesn’t live in NYC full time pic.twitter.com/qN7pU3xEDg

— Libs of TikTok (@libsoftiktok) April 15, 2026

Three months later, a new study suggests the mayor picked an odd moment to celebrate.

The Citizen Budget Commission published an analysis Monday, finding that New York's shrinking share of the nation's millionaires cost the state an estimated $10.7 billion in lost personal income tax revenue in 2022 alone. New York's share of the country's millionaires fell from 12.7 percent in 2010 to 8.7 percent in 2022, the steepest decline of any state over that period. Had New York simply held its 2010 share, the Commission concluded, the state would have collected roughly $10.7 billion more in personal income tax that year.

So Mamdani, who took office in January, had inherited a tax base already showing signs of flight. His pied-à-terre push targets exactly the kind of high earners the CBC says have been leaving in growing numbers, and critics view the timing as more provocation than plan. Gov. Kathy Hochul, who is running for reelection in November, has stopped short of backing an outright tax increase on wealthy New Yorkers this year, though she supports the pied-à-terre concept for luxury second homes in the city.

"In New York, the top 1% of earners pay about 45% of all state income taxes in any given year, so New York's revenue is very reliant on high earners to stay in New York, and that has been a challenge in recent years," said Jared Walczak, an economist and senior fellow at the Tax Foundation think tank, told the New York Post.

Walczak said city-level measures like Mamdani's cannot fix the underlying problem, since any meaningful tax change requires action in Albany. He also warned that continued hikes combined with more competitive alternatives elsewhere could accelerate departures.

Abir Mandel, senior state policy analyst at the Tax Foundation, said New York currently ranks last in the nation for tax competitiveness. She pointed to Elon Musk relocating his companies from California to Texas as the kind of decision New York risks inviting without reform, cautioning that the state will otherwise struggle to attract both population and business. Of Wall Street's outsized role in propping up state revenue, Mandel offered a blunt assessment. "Wall Street is the golden goose," she said. "But for how long?"

The CBC report traces the stagnation back well before Mamdani ever took office. Former Gov. Andrew Cuomo raised income taxes on high earners during the COVID pandemic, and Hochul now oversees Medicaid spending, which is on pace to reach $58 billion by the end of the decade. Ken Girardin, a research fellow at the Manhattan Institute, pointed to the state's 2019 rent-control overhaul and its green-energy mandate as a one-two punch that reduced housing supply and raised energy costs. "Albany is directly responsible for the stagnation," he said.

New York has lost more residents to every other state than it has gained from any of them, with Florida and Texas among the top destinations for departing New Yorkers, and that's a huge problem.

Justin Wilcox, executive director of Upstate United, called the study's findings hard to ignore. "It's difficult to not be alarmed by this data," he said. "With this CBC tool, Upstate New Yorkers can see for themselves the devastating impacts of Albany's policies - businesses failing to grow, population decline, and the loss of revenue. NYS needs to course correct now before it's too late and we become permanently entrenched in a cycle of fewer people."

Asked about the study on Monday during an unrelated event, Mamdani dismissed concerns that higher earners will flee the city, arguing that New York gained millionaires after past tax increases by Albany. He defended his broader philosophy without addressing the CBC's specific findings. "I've been very clear about the fact that we live in the wealthiest city in the wealthiest country in the history of the world, and it's unacceptable that one in four New Yorkers are living in poverty, and I believe that the wealthiest can do a little bit more to ensure that everyone can afford to live here," he said.