There is arguably no state better suited to taxing billionaires than California; the state leans politically to the left, requires funding for its healthcare sector, and is home to as many as 250 billionaires with a combined net worth exceeding $2 trillion.
However, political analysts consider the outcome of "Initiative 40" far from certain. Set for a vote in California on November 3, the initiative proposes a one-time, 5% levy on the state's billionaires—a move sparking debate over income inequality and the future of the state's business climate.
The debate over taxing the ultra-wealthy extends well beyond the Hollywood Hills and Silicon Valley. In New York, Democratic Socialist Zahran Mamdani filmed a video outside the apartment of billionaire investor Ken Griffin as part of a campaign that ultimately succeeded in securing taxes on luxury properties not used as primary residences.
According to Reuters, a poll conducted in 2025 indicated that a majority of Republicans believe billionaires contribute to worsening economic injustices and problems.
A Reuters/Ipsos poll conducted in August showed that 64% of registered independent voters support raising taxes on corporations and billionaires, while 15% oppose the idea. Emmanuel Saez, a UC Berkeley economics professor, wealth inequality researcher, and co-author of the initiative, stated, "Billionaires are no longer very popular."
He added that they possess "enormous wealth and enormous influence." Saez describes the initiative simply as a "tax on billionaires to fund healthcare."
According to Forbes estimates from last year, California is home to more billionaires than any other U.S. state and hosts some of the country's most valuable companies, including tech giants Google, Apple, Meta, and Nvidia.
Political analysts note that ballot initiatives in California typically require strong early support to succeed on Election Day, as undecided voters tend to vote "no" when the time comes, and opponents have not yet ramped up large-scale advertising campaigns.
Supporters say the measure could generate $100 billion to fund healthcare, food assistance, and education in California.
However, skeptics estimate revenues at only around $40 billion and argue that the move could drive some billionaires to leave the state, depriving it of tax revenue and future investment. The opposition has been bolstered by support from billionaires such as Google co-founder Sergey Brin, who spent over $100 million to defeat Proposition 40 and back counter-measures on the same ballot that would effectively nullify it.
