Not if the move happens after the date specified in the proposal. As of October 4, 2026, Proposition 40 is a proposed measure on California’s November 3, 2026 ballot, not enacted law. Its terms would generally cover qualifying billionaires who were California residents on January 1, 2026. A move afterward would not, by itself, undo that date-based residency condition. Whether someone was a California resident on January 1 is a fact-specific legal question.
What Proposition 40 would do
The California Legislative Analyst’s Office (LAO) describes Proposition 40 as a proposed one-time tax of 5% of net worth for qualifying billionaires who were California residents on January 1, 2026. Payment would generally be due in 2027. The initiative text calls January 1 the “tax obligation date” and December 31, 2026 the “valuation date”: the former is the proposed date for determining residency, while the latter is the proposed date for valuing assets.
The summaries describe covered wealth as including businesses, securities, art, collectibles, and intellectual property. Real estate, pensions, and retirement accounts generally would be excluded, but those summaries do not cover every statutory definition or exception. The initiative text would set standard apportionment without reducing it based on residency history, including whether the person was a California resident before the tax-obligation date. It also provides a process for alternative apportionment in certain circumstances. These are proposed terms, not rules currently in effect.
The LAO says a taxpayer could spread payment over five years for an additional cost. The official voter guide proposes allocating 90% of revenue to health care and 10% to food assistance or education-related programs, while prohibiting replacement of existing funding for those purposes with the new revenue.
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Why a move after January 1 may not change the result
The proposal specifies residency on January 1, 2026, rather than residency on the later valuation date or on the date a return is filed. So moving out after January 1 would not, on its own, change the residency condition stated in the proposal. A move before that date could matter only if the person had in fact ceased to be a California resident by then under the applicable rules; changing an address or another single record would not establish that conclusion by itself.
The LAO’s January 27, 2026 explanation of current California income-tax residency rules says: “The state does not have a single rule for determining whether a taxpayer is a resident or nonresident for tax purposes.” Instead, California reviews a person’s professional, personal, and social connections. The initiative text refers to residency under cited California statutes as of its tax-obligation date. The LAO’s income-tax explanation helps describe the state’s current approach, but it is not an individualized determination under Proposition 40’s proposed terms.
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Moving out does not end every California tax obligation
California’s current income-tax guidance treats a change of residency separately from whether particular income remains taxable in California. Nonresidents may still owe California income tax on California-source income. The Franchise Tax Board’s Publication 1100, revised October 2024, covers nonresidents and people who change residency into or out of California, and points to Publication 1031, Guidelines for Determining Resident Status, for help assessing status and income taxation. Leaving the state therefore does not automatically remove California tax on income connected to California.
A separate residency proposal is not Proposition 40
A different initiative, A.G. File No. 2025-039, proposed changing personal-income-tax residency definitions. The LAO analyzed it on January 27, 2026, and a Secretary of State notice said it entered signature circulation in February 2026. It is not the residency test in Proposition 40, and its proposed standards should not be treated as current law.
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| Question | Proposition 40 | A.G. File No. 2025-039 |
|---|---|---|
| Subject | Proposed one-time net-worth tax for qualifying billionaires. | Proposed changes to state personal-income-tax residency definitions. |
| Proposed residency approach | Whether the person was a California resident on January 1, 2026. | The proposal described a day-count approach involving time in California and whether a person had out-of-state identification and voter registration. It described nonresident treatment for people spending less than half the year in California with those out-of-state records, and additional tax treatment for some high-income nonresidents spending more than two months in the state. |
| Status in the cited materials | Listed for the November 3, 2026 general-election ballot; not enacted as of October 4, 2026. | Reported as a separate proposal that entered signature circulation in February 2026; the cited materials do not establish that it is current law or on the ballot. |
| Tax question | Potential liability under a proposed wealth tax. | Potential classification and income-tax treatment, including treatment of California-source income. |
What is known—and not known—about moving
- A move after January 1: It does not by itself change the proposal’s specified residency date.
- A move before January 1: The relevant issue would be actual residency status on that date, assessed under the applicable law and facts—not simply the move date.
- One changed record: A new driver’s license, voter registration, home, or mailing address alone does not guarantee a residency result.
- Personal exposure: The official summaries cannot decide an individual’s residency status, the application of statutory exceptions, or how a particular fact pattern would be resolved. A California tax professional can evaluate the person’s circumstances.
What the official revenue estimates mean
The LAO estimated that Proposition 40 could produce tens of billions of dollars in temporary state revenue spread across several years, while stressing that the timing and amount are very hard to predict. It also forecast a possible ongoing decrease of less than $1 billion per year in state income-tax revenue from billionaires. These are forecasts, not observed collections. The LAO cited more than $200 billion per year in state and federal spending on state health-care programs as context; that figure is not an estimate of Proposition 40 revenue.
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