California Voters Defeat Proposed Billionaires' Wealth Tax in Record Battle

California voters have defeated a contentious ballot measure that proposed a one-time tax on the state's ultra-wealthy residents. The bruising battle over Proposition 40 marked the most expensive opposition campaign in state history, drawing heavy financial backing and strategic maneuvering from Silicon Valley executives, major labor unions, and political leaders. The defeated measure, known as Proposition 40, sought to impose a one-time 5% levy on any individual in California holding a net worth exceeding $1 billion as of January 1, 2026. Sponsored by the healthcare union SEIU-United Healthcare Workers West, the initiative aimed to direct proceeds toward healthcare programs, along with education and food assistance. Supporters framed the tax as a necessary response to healthcare funding cuts stemming from federal legislation. However, wealthy opponents and tech executives pushed back forcefully against the proposal, arguing it would function as a tax on everyone rather than just the elite. Donors to the opposition campaign included high-profile executives from companies such as Google, Palantir, DoorDash, Stripe, and Reddit. Google co-founder Sergey Brin emerged as the largest individual contributor, investing at least $132 million to defeat the measure. Overall, the opposition coalition amassed nearly $425 million to fight Prop 40, with daily spending surging past $2.5 million during the first half of October. The opposition also deployed two counter-measures on the ballot, designated Proposition 41 and 42. While Prop 41 directly targeted the wealth tax, Prop 42 aimed to restrict certain new taxes entirely. Supporters of the billionaire tax labeled these parallel measures as "poison pills" designed to nullify the initiative even if it gained voter approval. Prominent political figures divided along distinct lines, with major state unions and progressive leaders backing the tax, while both Democratic and Republican gubernatorial candidates, alongside figures like Governor Gavin Newsom, opposed it. > California voters defeated a historic ballot measure proposing a one-time tax on billionaire wealth. ## Why California Voters Rejected Prop 40 The failure of Proposition 40 could stall broader nationwide momentum aimed at enacting similar taxes on ultra-wealthy individuals and compelling billionaires to contribute higher shares. With the defeat of this high-profile measure, future legislative efforts targeting billionaire fortunes face significant new hurdles following Silicon Valley's record-setting campaign.