California voters have decisively rejected Proposition 40, a first-of-its-kind ballot measure that would have imposed a one-time 5% tax on the net worth of residents worth more than $1 billion. The Associated Press projected the measure’s defeat after 83% of votes were counted, with 53.8% voting against it and 47.2% in favor. The result marks the most significant test yet of a wealth tax in the United States, an idea long championed by progressive politicians as a way to raise revenue from the ultra-rich by taxing their investment wealth rather than only their income.
Key outcomes and reactions
Proposition 40 proposed a one-time 5% levy on the net worth of Californians with assets exceeding $1 billion, targeting approximately 214 individuals as of January 2026. The measure’s primary revenue allocation would have replaced an estimated $100 billion in federal healthcare funding cuts over five years, with 10% of proceeds directed to education and food-assistance programs. Supporters, including SEIU United Healthcare Workers West, argued the tax was necessary to offset state losses from federal healthcare funding reductions tied to the 2017 Tax Cuts and Jobs Act. Progressive figures such as Senator Bernie Sanders campaigned in support of the measure, emphasizing its potential to address economic inequality.
Opponents, including California Governor Gavin Newsom and prominent business leaders, contended that the tax could drive billionaires to leave the state, harming California’s economy and tax base. Google co-founder Sergey Brin contributed over $100 million to the opposition campaign, while other tech executives such as Larry Page, Eric Schmidt, and Mark Zuckerberg took steps to prepare for potential tax liabilities, including moving entities out of California. The opposition campaign raised more than $400 million, with over 90% of funds directed against Proposition 40, making it one of the most expensive ballot initiative fights in California history.
Policy details and economic debate
The proposed tax would have applied only to individuals with net worth exceeding $1 billion as of January 1, 2026, and would have been levied on their total assets, including stocks, real estate, and other investments. Proponents, including economists Gabriel Zucman, Emmanuel Saez, and Gabriel Zucman, argued that California’s billionaires had accumulated $2.3 trillion in wealth by mid-2026, with fortunes growing 144% between 2023 and 2025 amid the AI boom. They estimated the tax could have raised tens of billions of dollars over several years, providing critical funding for healthcare and social programs.
Critics, including Stanford economist Joshua Rauh, countered that the tax could trigger an exodus of wealthy residents, citing the “Billionaires Paradox”—where the same wealth that makes taxation appealing also provides the means to resist it. Opponents warned that billionaires could relocate to states with lower tax burdens, such as Nevada, or restructure their assets to minimize liability. Some supporters, including Representative Ro Khanna, dismissed these concerns as “total propaganda,” arguing that the tax’s impact on the state’s economy would be minimal.
Political and demographic divides
The campaign over Proposition 40 revealed sharp political and demographic divides. Los Angeles and San Francisco counties, home to many of the state’s billionaires, showed the strongest support for the measure, while Orange County voted against it by a wide margin. Younger voters were more likely to back the tax, while older voters opposed it. The measure also faced opposition from rival labor unions, which criticized its focus on a one-time tax with revenues earmarked primarily for healthcare, potentially sidelining other priorities.
In a related development, voters approved Proposition 3, which makes permanent the higher income-tax rates paid by the state’s top 2%. This suggests that while Californians support taxing the wealthy, they were unconvinced by the specific structure of Proposition 40. Additionally, voters appeared poised to pass Proposition 42, a measure that would bar the state from enacting future taxes on many types of wealth, further constraining progressive tax efforts.
Long-term implications
The defeat of Proposition 40 represents a setback for progressive efforts to tax concentrated wealth in the U.S., particularly as a model for other states. The measure’s failure underscores the challenges of implementing wealth taxes at the state level, where economic mobility and political resistance can undermine even popular initiatives. The outcome may influence future debates over wealth taxation in Congress and the 2028 presidential election, where candidates like Gavin Newsom could face pressure to address economic inequality without alienating wealthy constituents.
Supporters of wealth taxes argue that the fight is far from over, pointing to polls showing broad public support for taxing the ultra-rich. Opponents, however, view the result as a validation of their concerns about economic harm and capital flight. The debate over Proposition 40 highlights the tension between progressive policy goals and the practical realities of taxing mobile capital in a globalized economy.