What Proposition 40 actually does
Confirmed: The measure labels its levy an excise tax on the activity of sustaining excessive accumulations of wealth. It applies to applicable California-resident individuals and applicable trusts that have net worth of at least $1 billion. A married couple is treated as one individual for filing. The tax obligation date is January 1, 2026; the valuation date is December 31, 2026.
The stated 5 percent rate applies to net worth. For an individual below $1.1 billion, the text reduces the rate by 0.1 percentage point for every $2 million below $1.1 billion, not below zero. A taxpayer can pay with the 2026 income-tax return or use five annual installments; later installments carry a 7.5 percent annual nondeductible deferral charge on the unpaid balance.
Confirmed: The official title and summary lists businesses, securities, art, collectibles, and intellectual property among covered assets. The full text uses fair-market valuation rules for public securities and business interests, includes many trust interests, and generally counts property transferred for less than fair value after October 15, 2025. Genuine qualifying debts can reduce net worth, subject to limits.
Confirmed: Real property held directly or through a revocable trust is excluded. Qualified pensions and most retirement arrangements are excluded; Roth-type retirement accounts are excluded only up to a $10 million aggregate present value. Tangible personal property outside California for at least 270 days in 2026 may be excluded, subject to an anti-avoidance rule. The measure also permits a combined $5 million exclusion for certain other assets, including art, collectibles, non-public financial instruments, intellectual-property rights, and vehicles.
How much money could it raise?
Confirmed: The Legislative Analyst's Office estimates a temporary increase of tens of billions of dollars, collected across several years. It does not assign a single number, explaining that collection depends on taxpayer efforts to reduce liability and the movement of asset values, especially stock prices.
Attributed: The official pro argument says Proposition 40 would raise about $100 billion. The official opposition argument says a Stanford-economist study predicts $25 billion in lost revenue from taxpayers and companies leaving. Those are campaign arguments, and the Secretary of State expressly says ballot arguments have not been checked for accuracy by any official agency. They should not be substituted for the LAO's range and uncertainty.
Confirmed: After administrative costs, 90 percent of the reserve fund goes to a health account and 10 percent to an education and food-assistance account. The Legislature may appropriate up to $22.5 billion annually from the health account and up to $2.5 billion annually from the education and food-assistance account, but may appropriate less to retain a reserve. The measure says the money cannot be used to supplant existing state appropriations for those purposes.
Would billionaires leave California? What the official estimate actually says
Confirmed: The LAO says some billionaires may respond in ways that reduce their income-tax payments, including by leaving California. It estimates those responses would probably reduce ongoing state income-tax revenue by less than $1 billion per year. It does not estimate that every affected taxpayer will leave, and it does not give a specific number of departures.
Assessed: The LAO's finding is a fiscal-risk estimate, not a prediction that migration will erase the one-time revenue. The official record supports saying behavioral response matters; it does not support presenting any campaign number for revenue loss as an independently established outcome.
Why Propositions 41 and 42 matter
Confirmed: Proposition 41 would require specified audits for new or increased special taxes and says that new special-tax spending might not be excluded from the state spending limit. Its own text applies to statewide initiatives submitted on or after January 1, 2026, including measures on the same ballot. Proposition 40 expressly excludes its revenue and spending from Article XIII B's limit. That is the concrete textual overlap between 40 and 41.
Confirmed: Proposition 42 would prohibit a post-January 1, 2026 state law or constitutional provision from creating, imposing, or authorizing a tax on ownership or control of its defined personal property. Its definition includes financial assets, investment accounts, business interests, digital assets, intellectual property, personal belongings, and other listed property. It separately bars a new tax that produces liability based on conduct, activity, or status before its effective date, expressly including residency status.
Assessed: Proposition 42 presents two apparent routes to a conflict with 40: the ownership-based tax on financial and other personal property, and the use of January 1, 2026 residency for a measure that would take effect after the election. Proposition 40's own constitutional authorization and severability language are countervailing text, but they do not make the conflict question disappear.
What happens if voters approve conflicting measures?
Confirmed: California Constitution Article II, section 10(b) provides that when provisions of two or more measures approved at the same election conflict, the provisions of the measure with the highest number of affirmative votes prevail. It does not say that the measure with fewer votes automatically vanishes in every respect.
Confirmed: Propositions 41 and 42 go further in their proposed conflicting-measures clauses. Each says that if it receives more yes votes than a specified conflicting initiative, its provisions prevail in their entirety and all provisions of the other measure are null and void. Each calls a same-ballot measure within its defined category a conflict.
Unresolved: If multiple measures pass, the vote totals are not known. Nor is it known whether a court would enforce the initiatives' all-or-nothing clauses to the full extent they claim, identify a narrower conflict, or conclude that portions can coexist. The LAO captures the practical bottom line cautiously: if 41 or 42 receives more yes votes than 40, Proposition 40 could be stopped from becoming law even if 40 has a majority.
What voters may not realize when they see all three measures on the ballot
Confirmed: A voter can vote yes on more than one measure. Nothing in the ballot titles alone tells a voter that Proposition 41 and Proposition 42 each expressly define particular same-ballot measures as conflicts and condition their own priority on a higher yes-vote total.
Assessed: A voter could reasonably support auditing, personal-savings protections, and funding for health care without realizing that the three measures may not all take effect as a single package. The relevant question is not partisan alignment; it is the particular language that each initiative adds to the Constitution or statutes.
What the measures do NOT establish
- They do not establish a final amount of revenue Proposition 40 would collect.
- They do not establish how many affected taxpayers would leave California or how much ongoing income-tax revenue would be lost.
- They do not establish that a majority vote for Proposition 40 alone guarantees collection of the tax.
- They do not establish that a higher yes-vote total for 41 or 42 automatically resolves every legal question without judicial interpretation.
- They do not establish that any particular health-care, education, or food-assistance program will receive a fixed amount in a particular fiscal year.
- They do not recommend a yes or no vote. That decision belongs to voters.
Evidence ledger
Proposition 40 uses a January 1, 2026 tax-obligation date, a December 31, 2026 valuation date, and a 5 percent statutory rate subject to its phase-in rule.
Proposition 40 excludes its revenue from the state spending limit; Proposition 41 expressly targets a same-ballot tax measure that does that.
Proposition 42 expressly reaches ownership-based taxes on a broad range of personal property and retroactive liability tied to past residency status.
The LAO estimates temporary revenue in the tens of billions and possible ongoing income-tax loss of less than $1 billion annually.
Proponents' official ballot argument says the measure would raise about $100 billion; opponents' official ballot argument cites $25 billion in lost revenue.
42 appears to present the more direct textual conflict with 40; 41 targets 40's spending-limit treatment and audit framework.
The results, relative yes-vote totals, taxpayer behavior, implementation rules, and judicial resolution of any conflict.
What evidence could change this assessment
- Official certified results for all three measures.
- A California court ruling on whether and how the measures conflict.
- Franchise Tax Board implementation guidance or regulations if Proposition 40 takes effect.
- Updated official fiscal analyses based on actual tax returns, asset values, and collection data.
- Any statutory or constitutional change before the election that alters the ballot or governing law.