Election Day explainer | November 3, 2026. This story describes proposals and pre-election polling, not election results.
California voters are deciding whether to impose a one-time tax on billionaire wealth, with most of the money reserved for health care. California Proposition 40 pairs an ambitious funding plan with a difficult question: how much can a state collect from its richest residents without losing future revenue?
The measure appears on the November 3 ballot alongside two proposals that could prevent it from taking effect. California’s official summary describes a tax of up to 5% on certain taxpayers’ covered wealth, rather than a flat bill for every person who reaches $1 billion.
The implications of California Proposition 40 extend beyond just taxes; it may redefine how wealth is taxed in the state.
Who would pay the tax?
The proposed law ties residency to January 1, 2026, and values wealth as of December 31, 2026. It covers qualifying individuals and certain trusts. Married couples count as one individual for filing purposes.
For individuals, the rate phases in between $1 billion and $1.1 billion. The full 5% rate applies at $1.1 billion. That rate applies to covered net worth, not just the portion above $1 billion. Business interests, securities and collectibles are among the covered assets; real estate and certain retirement assets are excluded.
Payment would begin in 2027. A five-installment option carries an annual 7.5% charge on the remaining unpaid balance. The text also includes separate deferral rules for qualifying assets.
What would the money fund?
After administrative expenses, 90% would go to health care and 10% to education and food assistance. The official summary says the revenue could not replace existing funding for those purposes.
The Legislative Analyst’s Office estimates that collections would total tens of billions of dollars over several years. It also projects a possible ongoing income-tax revenue loss of less than $1 billion annually as wealthy taxpayers change their behavior, including leaving California. Administrative costs could reach tens of millions of dollars a year for several years.
That is different from the roughly $100 billion revenue figure promoted by supporters. In their ballot argument, supporters say the tax would help replace federal health funding cuts and protect access to care. Their estimate is a campaign claim, not the state’s official revenue forecast.
A split over health funding and economic risk
SEIU-United Healthcare Workers West is a leading sponsor. Supporters include Sen. Bernie Sanders and the California Nurses Association. Their argument centers on asking the wealthiest residents to help pay for services threatened by funding cuts.
Opponents listed in the voter guide include Gov. Gavin Newsom, the California Teachers Association and Planned Parenthood Affiliates of California. They argue that the tax could push investment and wealthy residents out of state and would not provide a lasting funding source. The guide cautions that campaign arguments are the authors’ opinions and are not fact-checked by election officials.
CalMatters’ independent explainer describes another obstacle: valuing assets that rarely trade, such as private businesses and collections. Those assessments could require additional staff and invite disputes. Its reporting also documents disagreement over whether the new funds would reliably protect health services.
Two other measures could change the outcome
Proposition 41 would require audits linked to new special taxes and restrict exemptions from the state spending limit. Proposition 42 would prohibit new state personal-property taxes and certain retroactive taxes, applying to taxes enacted or effective on or after January 1, 2026.
The legislative analyst warns that Proposition 40 could be stopped even if it wins a majority, if Proposition 41 or 42 receives more yes votes and courts find a conflict. Approval of the wealth tax alone would therefore not settle whether it can take effect.
Campaign money and polling
Secretary of State records through October 22 list $33,413,577 in reported contributions supporting Proposition 40 and $130,344,804 opposing it. These are contributions, not spending totals, and the page is not a combined accounting of the campaigns for Propositions 41 and 42.
A Public Policy Institute of California survey conducted October 16–22 found 46% of likely voters supported Proposition 40, 52% opposed it and 2% did not know. The likely-voter sample was 1,086, with a margin of error of 3.8 percentage points.
Ipsos conducted the survey online in English and Spanish using its probability-based KnowledgePanel. Support was lower than in PPIC’s September survey, which found 52% in favor. Neither survey determines the outcome.
For New York readers, this is a California proposal, not a new New York tax or benefit. The practical issue to watch is whether a one-time levy can support services while preserving future revenue. Ballot counting and any legal disputes will determine the next steps.
