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California voters will decide Proposition 40 on November 3, 2026. As of October 4, 2026, it is a ballot proposal, not an enacted tax. If approved, it would impose a one-time tax on certain people and trusts tied to California residency on January 1, 2026.
How the proposed tax would work
The California Legislative Analyst’s Office (LAO) describes Proposition 40 as a one-time state tax equal to 5% of net worth for covered people who were California residents on January 1, 2026. Payment would be due in 2027. A taxpayer could elect to spread payments over five years, but doing so would cost more. These are proposed terms; the tax is not currently due.
The official voter-guide summary describes the tax as “up to 5%” on taxpayers and trusts with covered assets valued over $1 billion. The LAO’s overview uses the shorthand “billionaires” and describes the levy as 5% of net worth. Because those descriptions frame the threshold differently, the summary alone does not establish how every person’s assets or trust interests would be treated.
Who could owe the tax?
The central date in the LAO analysis is January 1, 2026. The proposal focuses on whether a taxpayer was a California resident on that date—not simply whether the person lives in California when payment would be due.
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- A person who became a California resident after January 1, 2026 does not appear to meet the stated residency cutoff.
- A person who was a California resident on January 1, 2026 should not assume that leaving California later removes them from the proposal’s stated cutoff.
- The voter-guide summary refers to taxpayers and trusts with more than $1 billion in covered assets; the LAO overview describes covered people in terms of billionaire net worth.
These are applications of the proposal’s stated terms, not decisions about any individual’s residency, trust interests, or tax liability. The official materials do not resolve every case-specific question.
Which assets would count?
The voter-guide summary lists businesses, securities, art, collectibles, and intellectual property among the covered asset categories. It says real property and some pensions and retirement accounts are excluded. The LAO likewise describes real estate, pensions, and retirement accounts as generally excluded.
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“Generally excluded” does not mean that every pension or retirement account is automatically exempt. The initiative’s precise terms and their implementation would matter for unusual or disputed assets; the official summary does not settle how every privately held or specialized asset would be valued.
Where the money would go
Proposition 40 would allocate 90% of revenue to health care services and 10% to food assistance or education-related programs. The official summary says the revenue could not be used to replace existing funding for the purposes described. It also describes exemptions from constitutional requirements related to school funding, budget reserves, and the state spending limit.
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What the LAO says about revenue and other fiscal effects
The LAO estimates that the measure would bring in tens of billions of dollars temporarily, spread over several years. It cautions that both the amount and timing are very hard to predict: taxpayer responses and changes in the value of stock-based wealth could affect collections. As the LAO puts it in its voter-guide analysis, “Exactly when and how much the state would collect is very hard to predict for many reasons.”
The LAO also identifies a possible ongoing decrease of less than $1 billion per year in state income-tax revenue collected from billionaires. That is a possible indirect effect, not a guaranteed loss. Administration could cost tens of millions of dollars per year for several years.
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Current status and what remains unsettled
The Secretary of State announced on June 17, 2026, that Proposition 40 had qualified for the November 3, 2026, general-election ballot. It appears in the official voter guide, and voters have not yet decided it as of October 4, 2026. The official materials explain the proposal but do not determine how courts would rule on future legal challenges or how administrators would value every unusual asset.
Sources: California Secretary of State, Proposition 40 Official Title and Summary; California Legislative Analyst’s Office, Proposition 40 Analysis; California Secretary of State, June 17, 2026 press release.
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