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
