In 2026, the American tax landscape has fractured into two distinct movements. While a group of "high-service" states is doubling down on progressive surtaxes to fund social programs, a competing block of "low-tax" states is moving aggressively to eliminate income taxes for their wealthiest residents.
This trend, often termed the "Millionaire Tax Proliferation,” is no longer just a coastal state phenomenon. It has become a high-stakes competition for capital, residents, and social equity.
The Surtax Wave: Funding the Future
Several states have recently implemented or expanded taxes specifically targeting those earning over $1 million annually. The primary driver is a need for sustainable revenue to fund education, transportation, and climate initiatives
Washington State:
Long known as a "no-income-tax" state, Washington made a historic shift in March 2026. On March 30th, 2026, Washington enacted a 9.9% income tax on earnings exceeding $1 million (scheduled to begin in 2028). This follows the state’s successful (and legally upheld) 7% tax on high-end capital gains.
Massachusetts:
Since voters approved a 4% surtax on income over $1 million in 2022, the state has collected over $6 billion. In 2026, the threshold for this tax is indexed to inflation at $1,083,150. While the revenue has bolstered public transit, IRS migration data from early 2026 suggests a $4.2 billion outflow of adjusted gross income, indicating that some high earners may be voting with their feet.
California:
California already maintains the nation's highest top marginal rate at 13.3%. However, for the November 2026 ballot, activists have proposed the Billionaire Tax Act, which would impose a one-time 5% excise tax on residents with a net worth exceeding $1 billion.
New York:
Despite political pressure, the state continues to debate extending "temporary" high-earner surtaxes. In New York City, a 2026 proposal to hike taxes on millionaires to fill a $5 billion budget hole remains a point of contention between the Mayor and the Governor.
The Race to Lower Taxes
While some states hike rates, others are moving in the opposite direction, viewing the "Millionaire Tax" trend as an opportunity to poach high-net-worth individuals and their businesses.
The Elimination States:
In 2025 and 2026, states like Mississippi and Oklahoma approved plans to phase out their state income taxes entirely. In Mississippi, the goal is full elimination by 2040, providing an average annual tax cut of $141,000 for millionaires.
The Flat Tax Shift:
Kansas and Ohio recently adopted flat-tax systems. These moves lower the rates for the highest earners, costing each state approximately $1 billion in annual revenue but theoretically increasing their "tax competitiveness."
Missouri:
In early 2026, Missouri became the first state to fully exempt capital gains income from taxation, a policy aimed squarely at attracting investors and retirees.
The Washington Millionaires Tax and the Capital Gains Tax may be interpreted as a gradual move toward imposing income taxes on all state residents. The Millionaires Tax will almost certainly be challenged in court, but Washington residents need to manage their financial planning with an increasingly complex tax policy background.
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