California Prop 40 Wealth Tax Fails: A Blow to Progressives

• by Shimanta Das
• November 11, 2026

California billionaires secured a decisive victory in one of the most expensive ballot measure campaigns in state history, defeating Proposition 40, a proposed one-time 5% wealth tax on the state’s ultra-wealthy. The measure’s failure marks a major loss for progressives who had hoped it would serve as a model for other states or even a federal wealth tax. The bruising campaign over Prop 40 was the most expensive in California history, characterized by back-and-forth dealings from tech billionaires and Democratic leaders, including Governor Gavin Newsom, who steadfastly opposed the measure.

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Supporters of Prop 40 framed it as a solution to drastic healthcare cuts stemming from Donald Trump’s One Big Beautiful Bill Act. However, opponents, led by prosperous billionaires, mounted an influential campaign that characterized the billionaire tax as “an everyone tax.” Proposition 40 was the nation’s biggest test yet on an idea progressives have long championed: raising taxes on the ultra-rich by targeting the main way they make their money — through their investments as opposed to the paychecks they receive from work. The measure’s defeat signals a significant setback for those seeking to address wealth inequality through taxation.

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Notable backers of Prop 40 included another potential White House hopeful, who held several rallies in the state ahead of Election Day. Despite their efforts, the opposition’s messaging resonated with voters. According to the AP Voter Poll, the majority of young voters in California — those younger than 30 — voted “yes” on Proposition 40, indicating a generational divide on the issue. KQED’s Sukey Lewis contributed to this report.

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The outcome underscores the challenges of enacting wealth taxes even in a deep-blue state. It also highlights the influence of billionaires in political campaigns and the difficulty of overcoming well-funded opposition. As progressives regroup, the defeat of Prop 40 may slow momentum for similar initiatives elsewhere. For now, California billionaires have won a contentious battle, but the debate over wealth inequality and tax policy is far from over. You turn to us for voices you won’t hear anywhere else. Sign up for ‘s Daily Digest to get our latest headlines and stories delivered