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California’s Proposition 40 would impose a one-time tax of 5% on the covered net worth of billionaires who were California residents on January 1, 2026. The measure is on the November 3, 2026 ballot, and it has split Democratic allies: SEIU-United Healthcare Workers West and U.S. Sen. Bernie Sanders support it, while Gov. Gavin Newsom and several major health, education, labor, and business groups oppose it. The central dispute is whether a large but uncertain one-time tax can protect health-care funding—or whether revenue volatility, valuation problems, and legal risks make the proposal too costly and unpredictable.
What would Proposition 40 do?
The initiative would tax covered billionaires who met its California-residency test on January 1, 2026. The tax would be due in 2027. Taxpayers could pay over five years, but spreading payments would cost more. The California Legislative Analyst’s Office (LAO) describes the rate as 5% of covered net worth.
The Secretary of State’s official summary says covered assets include businesses, securities, art, collectibles, and intellectual property. Real property and some pensions and retirement accounts would generally be excluded. That makes the measure relevant to wealth held in company ownership, investments, and other non-real-estate assets, but the precise treatment of particular holdings would depend on the initiative’s rules and their application.
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Ninety percent of the proceeds would have to fund public health-care services. The rest would support education, food assistance, and tax administration. The initiative would also exempt the proceeds from certain constitutional spending rules, including rules for school funding, budget reserves, and state spending limits.
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Why are Democrats on opposite sides?
Supporters see a way to direct substantial money toward health care at a time when federal cuts threaten coverage and put pressure on state services. Opponents question whether the measure can deliver dependable net revenue without harming California’s economy and budget, and whether its safeguards and implementation rules are adequate. The split does not follow a simple party line: labor organizations themselves are divided, and the opposition includes groups representing health care, educators, firefighters, and construction workers.
| Position | Core case | Examples named in reporting |
|---|---|---|
| Support | Raise new money from billionaires to protect health-care services amid federal funding cuts. | SEIU-United Healthcare Workers West and Sen. Bernie Sanders. |
| Opposition | A one-time tax could damage the economy and state finances, while its design may not reliably reduce health-care costs. | Gov. Gavin Newsom; California Teachers Association; California Medical Association; California Children’s Hospital Association; California Professional Firefighters; and State Building and Construction Trades Council of California. |
The official Yes-on-40 argument in the California voter guide says: “Trump slashed healthcare funding to pay for billionaire tax breaks, eliminating coverage for over a million Californians and doubling health insurance premiums for millions more. It’s time to make billionaires pay their fair share and stop sticking the middle class with the bill.” Those statements are the campaign’s claims, not independent findings.
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The official No-on-40 argument calls the measure “a flawed, one-time tax scheme that hurts our economy, damages our state budget, and contains a loophole exposing all Californians to taxes we can’t afford—but does nothing to lower healthcare costs.” It ends: “No safeguards, no accountability.” That language, too, is the campaign’s argument rather than a settled assessment.
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SEIU-UHW offered Newsom a proposed compromise, according to the Associated Press: a 2% tax instead of 5%, in exchange for his support of a legislative alternative and withdrawal of the initiative. The governor’s office said the lower rate did not change his opposition. UCLA political science professor Martin Gilens told the AP, “There’s kind of a perfect storm that sort of bolsters preexisting inclinations to be sympathetic to the idea of raising taxes on the well-to-do.”
How much money could it raise—and what could reduce the net?
The LAO estimates Proposition 40 probably would raise tens of billions of dollars over several years. It says both the amount and timing are very hard to predict because asset values change and taxpayers may take steps to reduce their liability. This is a forecast, not money already collected.
SEIU-UHW has stated a goal of raising $100 billion, mainly for California’s Medicaid system following federal cuts, the AP reported. That is the union’s target, not the LAO’s estimate.
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The LAO also warns that responses by affected taxpayers could reduce state income-tax revenue by less than $1 billion per year. It estimates that administering the tax could cost tens of millions of dollars per year for several years. Those figures are forecasts; they are not observed costs or a prediction of the tax’s final net yield.
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California does not traditionally value and tax personal property in the way Proposition 40 would require. CalMatters reports that implementation would involve valuing assets such as shares, investment accounts, business interests, art, wine, and cars. The difficulty would vary: publicly traded shares have observable market prices, while private businesses and bespoke assets can be harder to value and more likely to prompt disagreement.
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Experts interviewed by CalMatters differed on how difficult the work would be, and the outlet reported that they expect litigation. That is a reported expectation, not a court ruling or proof that any particular asset valuation would fail. The question matters to the fiscal debate because disputes, taxpayer responses, and the time required to resolve valuations could affect how much revenue arrives and when.
Could another ballot measure or a court change the outcome?
Yes. The LAO says Proposition 40 could be prevented from taking effect even if it receives more yes than no votes if Proposition 41 or Proposition 42 receives more yes votes and a court finds the measures conflict. The proposed act also anticipates validation litigation and calls for expedited proceedings. Whether either ballot interaction or a legal challenge will alter Proposition 40’s fate remains unresolved.
What is at stake in the campaign?
The measure qualified for the ballot after California announced eligibility on June 17, 2026. The Secretary of State set 874,641 valid signatures as the qualification threshold; 962,106 projected valid signatures was the random-sampling threshold. These are qualification figures, not vote totals.
Campaign spending is also substantial. CalMatters reported on October 1, 2026, that Sergey Brin had spent more than $138 million and opponents had raised more than $205 million. These are time-sensitive campaign-finance totals and may have changed since that report.
For voters, the key trade-off is not simply whether health care needs money or whether billionaires should pay more. It is whether a one-time levy with uncertain timing can fund urgent services without creating larger problems through asset disputes, reduced recurring income-tax receipts, administrative expense, or conflict with other measures. The LAO’s estimate supports neither a guaranteed windfall nor a claim that the tax would raise nothing: it points to potentially large receipts alongside unusually high uncertainty about their size and timing.
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