California’s Proposition 40: A Contested Billionaire Tax

California voters appeared to be against Proposition 40, a proposed one-time tax on billionaires. By Wednesday afternoon, the measure had 44.4 percent support, with 55.6 percent opposed and around 60 percent of votes counted.

Despite its likely defeat, Proposition 40’s supporters are already planning future efforts. The Service Employees International Union-United Healthcare Workers West (SEIU-UHW), the measure’s sponsor, hinted at potentially reintroducing the proposal in 2028. Suzanne Jimenez, chief of staff at SEIU-UHW, stated the aim to hold billionaires accountable if solutions remain inadequate.

“If Sacramento fails to protect patients and deliver a real solution that makes billionaires pay their fair share, healthcare workers will pursue every available avenue, up to and including returning to the ballot in 2028 with a billionaire tax,” Jimenez said in a statement.

This unprecedented tax aimed at billionaires would impose a 5 percent levy on residents with a net worth over $1 billion. The idea has stirred disagreement among Democrats and faced strong opposition from California’s tech sector.

Wealthy tech figures like Google’s Sergey Brin have invested significant sums opposing Proposition 40. Brin contributed $102 million to the group ‘Building a Better California,’ which seeks to defeat this measure and promote alternative propositions, 41 and 42.

A spokesperson for Building a Better California highlighted worries about Proposition 40’s potential effects on state services and the economy, citing concerns over healthcare, education, and the state’s financial health.

Understanding Proposition 40

Proposition 40, or the Billionaire Tax Act, proposed taxing Californians with over $1 billion in net worth as a one-time measure. Sponsored by SEIU-UHW, proponents saw it as a way to fill gaps left by expected federal healthcare funding cuts.

This proposal became one of the most controversial issues on California’s 2026 ballot, causing rifts among Democrats and receiving pushback from business and tech leaders.

Supporters, including Senator Bernie Sanders, argued that wealthier citizens should contribute more to public services, claiming Prop 40 as a pivotal measure in American politics.

In contrast, Governor Gavin Newsom opposed it, fearing it might drive wealthy individuals out of California.

Details of the Billionaire Tax

Proposition 40 would demand a one-time payment based on net worth, unlike an annual tax. This covers financial assets such as stocks and property. Tax liability would start in 2027, with potential payment plans extending over five years, incurring extra costs.

Revenue projections from supporters estimate around $100 billion over five years, though the state’s Legislative Analyst’s Office provides less optimistic figures, predicting losses below $1 billion annually if billionaires leave. The proposal allocates 90 percent to healthcare and the rest to education and support programs.

Eligibility and Impact

The tax targets billionaires residing in California on January 1, 2026, affecting around 200 individuals, as reported by Newsweek. Significant attention centers on residency rules, notably after some billionaires sought residences outside California before the deadline.

Sergey Brin, for example, registered to vote in Nevada, questioning the success of relocating.

Timing and Potential Legal Issues

If passed, the tax would commence in 2027. Legal issues, such as retroactivity and residency, might delay or obstruct implementation.

Challenges from Propositions 41 and 42

Proposition 40 faces threats from competing measures. Proposition 41 would prevent state taxes that exclude revenue from the spending cap and mandate audits. Proposition 42 would ban new taxes on financial assets and restrict retroactive taxes.

If either Proposition 41 or 42 gathers more support, Proposition 40 may not become law even with majority approval. Legal conflicts could arise according to the Legislative Analyst’s Office.

Californian Labor leader Lorena Gonzalez mentioned that Proposition 40 might fail. She indicated willingness to explore more effective strategies for taxing the wealthy.