New York’s Shrinking Millionaire Edge Puts Mamdani’s Tax Gamble Under Pressure

New York has never lacked wealthy residents. Its towers, finance firms, and luxury neighborhoods have long made extraordinary fortunes feel almost ordinary.

But a growing political fight is exposing a weakness beneath that image. New York’s share of America’s million-dollar earners has fallen sharply, while Mayor Zohran Mamdani is asking Albany to let the city collect more from those who remain.

The decline began years before Mamdani entered City Hall, meaning his policies did not create the trend. Still, the numbers are now complicating his push for higher taxes on wealthy residents.

The clash is not simply about whether rich people should pay more. It is about how far New York can lean on a small, mobile group of taxpayers before a crucial revenue source begins to shrink.

The Millionaire Count Grew, but New York Lost Ground

A Citizens Budget Commission analysis found that New York held 12.7 percent of the nation’s millionaire tax filers in 2010. By 2022, that share had fallen to 8.7 percent, the largest decline recorded by any state during the period.

New York did not run out of millionaires. Their number roughly doubled. The problem is that millionaire populations expanded much faster elsewhere. California and Texas tripled their totals, while Florida’s increased fourfold.

New York consequently fell from second to fourth place among states with the most millionaire filers. New York City’s national share also dropped from 6.5 percent to 4.2 percent.

The commission estimated that New York State would have collected about $10.7 billion more in personal income tax revenue in 2022 if it had maintained its 2010 share. The city could have received another $2.5 billion.

Mamdani Is Betting on the Tax Base

Mamdani has proposed a two-percentage-point increase in the city income tax on people earning more than $1 million annually. Supporters estimate that the surcharge could generate roughly $3 billion a year and affect about 0.7 percent of city taxpayers.

The money would help close future budget gaps and support his affordability agenda, which emphasizes housing, child care, transportation, and other public services. New York City faces a projected multibillion-dollar gap for the 2027 fiscal year, although estimates vary depending on the assumptions used.

The mayor has also joined Governor Kathy Hochul in advancing a pied-à-terre tax on luxury second homes valued at more than $5 million. City officials project that the measure could raise approximately $500 million each year.

Mamdani’s argument is direct: New York remains one of the world’s richest cities, and residents benefiting most from its economy can contribute more to keeping it livable.

Critics See a Revenue Trap

Opponents argue that the plan could weaken the very tax base it is designed to rely on.

High earners contribute a disproportionately large share of New York’s personal income tax revenue. Losing a relatively small number can therefore create a much larger budget effect than the departure of thousands of average-income households.

Florida and Texas are central to that concern. Their lower-tax environments have helped make them powerful competitors for wealthy households, businesses, and investment.

The Citizens Budget Commission’s findings do not prove taxes alone caused New York’s falling share. Housing costs, business conditions, remote work, family decisions, and quality-of-life concerns can also influence migration.

Still, critics argue that another tax increase could become the final reason for a wealthy household already considering a move.

Recent Data Complicates the Exodus Story

New York’s tax department provides a less dramatic picture of recent movement.

Nearly 1,700 millionaire filers changed their addresses to another state during 2024. That was well below the pandemic-era peak of more than 3,300 in 2020. The departure rate fell from 6.09 percent in 2020 to 2.49 percent in 2024, approaching earlier levels.

The total number of millionaire filers also rose from about 45,100 in 2017 to more than 67,400 in 2024.

Those figures challenge claims that millionaires are currently fleeing in an uncontrolled wave. Yet New York can still lose ground if other states attract wealthy households faster.

That distinction matters. New York’s problem may be less about a sudden disappearance of wealthy residents and more about failing to capture the same pace of wealth creation seen elsewhere.

Supporters Say the Rich Rarely Leave So Easily

Economists skeptical of the exodus argument say wealthy residents are often less mobile than political warnings imply.

Their businesses, professional networks, schools, and social lives are deeply connected to New York. Changing legal residence may be possible, but replacing the city’s financial ecosystem, clients, and influence is harder.

Research by Cornell sociologist Cristobal Young finds that high earners tend to leave New York at lower rates than working- and middle-income households in normal years. Supporters say that makes targeted increases less dangerous than critics claim.

Mamdani’s popularity also suggests the tax message has not frightened most voters. A June Siena poll found that 58 percent of New Yorkers approved of his performance, while 26 percent disapproved.

Albany Holds the Most Important Cards

Mamdani cannot impose the proposed surcharge on its own. New York City needs authorization from state lawmakers and the governor before changing its local income tax rate.

Hochul has resisted broad income tax increases, even as she worked with Mamdani on targeting expensive second homes with taxes. That difference leaves the larger revenue plan uncertain.

Albany must weigh two risks. Rejecting higher taxes could mean service cuts, delayed programs, or deeper budget gaps. Approving them could encourage more high earners to reconsider where they live and pay taxes.

New York’s Challenge Is Bigger Than One Tax

The debate is often presented as a choice between protecting millionaires and helping working families. In reality, both groups are connected to the same fiscal system.

New York needs revenue for schools, hospitals, transit, policing, and housing. It also needs a competitive economy capable of retaining the incomes that generate that revenue.

Mamdani is betting that the city’s opportunity, culture and global status are valuable enough to survive higher taxes. His critics believe wealthy residents have more choices than City Hall understands.

The coming years will reveal which side has judged New York’s appeal more accurately. By the time the answer becomes obvious, however, the people and money involved may already have moved.