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What Proposition 40 proposes
Proposition 40 is on California’s November 3, 2026 ballot. It became eligible for the ballot on June 17, 2026, according to the Secretary of State’s announcement. As of October 4, 2026, voters have not decided whether it will take effect.
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The official voter-guide summary describes a tax of up to 5% on taxpayers and trusts with covered assets valued over $1 billion. The LAO’s analysis uses the simpler shorthand of a one-time 5% tax on the net worth of qualifying billionaires. Those descriptions are useful for understanding the proposal, but they do not establish how every person’s assets, trust interests, or circumstances would be treated.
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The proposal’s asset and payment details are described in the California Official Voter Information Guide, Proposition 40 summary and the accompanying LAO analysis.
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Who could owe the tax
The LAO identifies California residency on January 1, 2026 as the key date. Under its description, people who were California residents on that date and meet the measure’s wealth threshold could owe the tax. The voter-guide summary also identifies trusts with covered assets above $1 billion.
- A person who became a California resident after January 1, 2026 does not appear to meet the stated residency cutoff.
- A person who left California after January 1, 2026 should not assume that leaving later removes them from the cutoff described in the analysis.
These are applications of the proposal’s stated date, not determinations about any individual’s legal residence or tax liability. The official summary and LAO analysis do not resolve every question about residency, trust interests, or unusual asset arrangements.
Which assets count, and which are excluded
The official 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.
“Some” and “generally” matter: the available descriptions do not establish that every pension or retirement account is exempt, or how every unusual or privately held asset would be valued. Asset-specific outcomes would depend on the initiative’s text and any implementation rules.
How much, when, and how payment could be made
For qualifying taxpayers, the LAO describes a one-time tax equal to 5% of net worth, due in 2027. Taxpayers could elect to spread payment over five years, but doing so would cost more. The voter-guide summary’s “up to 5%” wording and reference to covered assets and trusts should be kept in view when considering cases that do not fit the LAO’s shorthand description of billionaires.
Where the revenue would go
The measure would allocate 90% of receipts 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 described purposes. It also describes exemptions from constitutional requirements concerning school funding, budget reserves, and the state spending limit.
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What the LAO says about revenue and fiscal effects
Temporary tax collections
The LAO estimates that the measure probably would raise tens of billions of dollars over several years. It cautions that the total and timing are very hard to predict because taxpayer responses and the value of stock-based wealth can change. As the LAO puts it: “Exactly when and how much the state would collect is very hard to predict for many reasons.”
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The voter-guide analysis says California could see an ongoing decrease of less than $1 billion per year in state income-tax revenue collected from billionaires. This is a possible indirect effect, not a guaranteed loss. The LAO also says administration could cost tens of millions of dollars per year for several years.
The temporary wealth-tax receipts and possible ongoing income-tax decrease are different fiscal effects, and neither should be read as a precise forecast. The LAO notes substantial uncertainty in both the amount and timing of collections.
What remains unresolved
The official materials explain the broad design and fiscal outlook, but do not settle how courts would rule on possible legal challenges or how administrators would value every unusual asset. They also do not provide enough detail to calculate a specific person’s liability. Anyone facing a possible exposure would need advice based on their actual residency, assets, and trust arrangements.
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