California voters are deciding today whether to pass Proposition 40, a 5% one-time tax on residents with over $1 billion in net worth, but two competing "poison pill" measures—Propositions 41 and 42—funded by tech billionaires could nullify it if they receive more votes. The Public Policy Institute of California found 51% of likely voters support Proposition 41 and 54% support Proposition 42, both designed to invalidate Proposition 40.
California’s billionaire tax faces 'poison pill' vote that could nullify it
Proposition 40 is a ballot measure that would impose a one-time 5% tax on California residents with a net worth exceeding $1 billion, excluding real estate and retirement assets. The revenue generated would primarily fund healthcare programs, with 10% allocated to education and food assistance.
Key numbers
| Stat | Figure | Date | Source |
|---|---|---|---|
| $1 billion | Net worth threshold for Proposition 40 tax | 2026-11-03 | CBS News |
| 5% | One-time tax rate on billionaires under Proposition 40 | 2026-11-03 | CBS News |
| $100 billion | Estimated revenue from Proposition 40 over five years (proponents) | 2026-11-03 | CBS News |
| $30 billion | Estimated revenue from Proposition 40 (Stanford study) | 2026-11-03 | CBS News |
| $250 million | Funding raised by Building a Better California against Proposition 40 (as of Oct. 28) | 2026-11-03 | CBS News |
| $540 billion | Billionaire wealth removed from California by billionaires who left the state | 2026-11-03 | CBS News |
What happened
California voters are casting ballots today on Proposition 40, a measure that would impose a one-time 5% tax on residents with over $1 billion in net worth, excluding real estate and retirement assets. The tax is designed to generate revenue for healthcare and education, but its passage hinges on whether two competing "poison pill" measures—Propositions 41 and 42—funded by tech billionaires like Sergey Brin and Larry Page, could outpoll it. If either Proposition 41 or 42 receives more votes than Proposition 40, the billionaire tax would be nullified entirely.Who is affected
The measure directly affects California’s roughly 250 billionaires, but its broader implications extend to the state’s economy, healthcare system, and middle-class residents. Supporters argue it will generate billions for public services, while opponents warn it could drive wealthy residents—and their investments—out of the state. Labor unions like SEIU Healthcare Workers West support Proposition 40, while major healthcare organizations, including the California Medical Association, oppose it. Tech billionaires, including Nvidia CEO Jensen Huang, have taken opposing stances: Huang supports the tax, while others like Brin and Thiel have funded campaigns to defeat it. See the table above for verified figures, including the $1 billion net worth threshold, the 5% tax rate, and the estimated revenue projections from Proposition 40.What to do next
Voters in California have already cast their ballots for Proposition 40, Propositions 41, and 42. Results will be tallied and certified by local election officials over the coming days, with official outcomes expected within the next two weeks. The state’s Secretary of State will release preliminary results, followed by a final certification. For now, voters should check their local election websites for updates on vote counts and deadlines for requesting mail-in ballots if they missed today’s election.What we know and don’t know
We know that Proposition 40 would impose a one-time 5% tax on billionaires’ net worth, with 90% of revenue earmarked for healthcare and 10% for education and food assistance. We also know that Propositions 41 and 42, funded by tech billionaires, could nullify Proposition 40 if they receive more votes. However, we don’t yet know the final vote totals or how Proposition 40’s revenue estimates will compare to projections. Additionally, the long-term economic impact of the tax—or its repeal—remains uncertain, as does whether wealthy residents will leave the state in response.Timeline of the poison pill measures
1. September 16, 2026: The Public Policy Institute of California releases a poll showing 52% support for Proposition 40, 51% for Proposition 41, and 54% for Proposition 42. 2. October 28, 2026: Building a Better California reports raising over $250 million to oppose Proposition 40 and support Propositions 41 and 42. 3. November 3, 2026: California voters cast ballots on Propositions 40, 41, and 42. 4. November 4–17, 2026: Local election officials begin tallying and certifying vote results. 5. November 17, 2026 (estimated): Final certification of election results by the California Secretary of State.Why it matters
The outcome of today’s vote could set a precedent for how states tax extreme wealth and fund public services. Proposition 40 represents a bold attempt to address economic inequality, while Propositions 41 and 42 highlight the power of wealthy donors to shape ballot measures. If Proposition 40 passes, it could generate billions for healthcare and education, but if the "poison pills" prevail, it would signal a major victory for billionaire-funded opposition campaigns. The result will also influence similar debates in other states and at the federal level.How to vote or check results
Voting has already concluded for today’s election. To check results, visit your local county election website or the California Secretary of State’s election page. For official vote counts and certifications, follow updates from the California Secretary of State’s office.Frequently asked questions
What is Proposition 40?
Proposition 40 is a ballot measure that would impose a one-time 5% tax on California residents with a net worth exceeding $1 billion, excluding real estate and retirement assets. The revenue generated would primarily fund healthcare programs, with 10% allocated to education and food assistance.
What are Propositions 41 and 42?
Propositions 41 and 42 are "poison pill" measures funded by tech billionaires, including Sergey Brin and Larry Page. If either measure receives more votes than Proposition 40, it would nullify the billionaire tax entirely. Proposition 42 specifically bans any new state tax on personal property, including retirement accounts.
Who supports and opposes Proposition 40?
Proposition 40 is supported by the California Democratic Party, labor unions like SEIU Healthcare Workers West, and economists including Nobel Prize winners Daron Acemoglu and Joseph Stiglitz. It is opposed by Governor Gavin Newsom, former Rep. Katie Porter, and major healthcare organizations such as the California Medical Association. Tech billionaires like Sergey Brin, Larry Page, and Peter Thiel have funded opposition campaigns.
How much revenue would Proposition 40 generate?
Proponents estimate Proposition 40 would generate $100 billion over five years, with 90% allocated to healthcare. However, a Stanford University study suggests the tax could yield only about $30 billion due to billionaires leaving the state.
Can Proposition 40 be expanded to middle-class taxpayers?
Proponents of Proposition 40 argue it allows the state legislature to expand the tax to middle-class residents with a two-thirds vote, though opponents claim this is misleading. The measure explicitly targets billionaires, but its language could theoretically be interpreted to include broader tax increases in the future.
What happens if Proposition 40 fails?
If Proposition 40 fails, the billionaire tax would not take effect. However, if either Proposition 41 or 42 receives more votes than Proposition 40, the billionaire tax would be nullified regardless of its individual vote total. This could signal a major setback for efforts to tax extreme wealth in California.
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Sources
- The 'poison pill' ballot measure that could kill the California billionaire tax — cnbc.com, 2026-11-03
- Californians to decide whether to tax billionaires with Proposition 40 vote — cbsnews.com, 2026-11-03