A $100 Billion Gamble: California's Proposed Billionaire Tax

The fate of California's healthcare system hangs on a single ballot measure that targets the state's wealthiest residents.

Proposition 40, scheduled for a November vote, proposes a one-time 5% tax on the net worth of the more than 200 billionaires residing in the state. If approved, this levy would apply retroactively to anyone with a net worth of at least $1 billion who lived in California as of January 1, 2026. Advocates argue the measure is a necessary response to federal funding cuts stemming from the current administration's tax and spending bill. Suzanne Jimenez of Service Employees International Union-United Healthcare Workers West described the proposal as a short-term solution to prevent a collapse in the healthcare system while longer-term funding strategies are developed.

The state faces a complex economic landscape. While California possesses the largest economy in the United States and ranks fourth globally, it also holds the nation's largest share of homeless people and one of its widest wealth gaps. Francesco Trebbi, a public policy professor at the University of California, Berkeley, noted that this appears to be the first billionaire tax targeting such an extreme percentile of the wealth distribution. He suggested the initiative is driven by an anti-elite sentiment aimed at re-balancing the scale, rather than just a specific policy fix.

Opposition is strong, led by Governor Gavin Newsom, whose tenure is ending. Newsom warns the tax could drive wealthy residents and their income tax revenue out of the state. Google cofounder Sergey Brin has contributed over $100 million to a political organization funding measures that could block the proposal. A September poll by the Los Angeles Times and the Berkeley Institute of Governmental Studies found 45% of likely voters in favor, 42% opposed, and 13% undecided, meaning a clear majority is required for passage.

The potential financial impact is significant for individual billionaires. Mark Zuckerberg told Meta's board last month he was considering moving his primary residence out of the state. Meta agreed to a stock deal giving him more shares to offset potential losses, with his liability reaching as high as $12.5 billion. At least six billionaires, including Larry Page, Peter Thiel, Travis Kalanick, and Don Hankey, have reportedly left the state. Hankey told Forbes he moved to Nevada because the proposal made him feel unwanted despite the jobs his companies created.

Supporters argue the tax aligns with a broader trend. Nvidia chief Jensen Huang told CBS he does not mind paying taxes and that higher earners should pay more. Senator Bernie Sanders predicted that voters would send a powerful lesson to billionaires on November 3. This debate fits into a wider national conversation, as Washington state also considers a 9.9% tax on income over $1 million. Data from the third quarter of 2025 shows the top 1% of households hold nearly 32% of wealth, a level near its highest in over three decades.

Dr. Kristian Niemietz of the Institute of Economic Affairs noted that while wealth taxes were once common in Europe, only Spain, Norway, and Switzerland still maintain them, calling such levies more trouble than they are worth. Ultimately, the vote represents a test of whether Californians are willing to use a historic tax tool to address deepening economic divides.