California’s Proposition 40 would impose a one-time 5% tax on the covered net worth of people who were California residents on January 1, 2026. The measure is on the November 3, 2026 ballot, and it has split Democratic alliances: SEIU-United Healthcare Workers West and Sen. Bernie Sanders support it, while Gov. Gavin Newsom and several health, education, labor and business groups oppose it. The dispute is not simply over whether health care needs money; it is over whether a large, one-time tax can deliver that money reliably without unacceptable fiscal and implementation risks.
What would Proposition 40 do?
If approved, Proposition 40 would levy a one-time tax of 5% on the covered net worth of people who were California residents on January 1, 2026. Payment would be due in 2027. Taxpayers could pay in installments over five years, but spreading the payments would cost more.
The California Legislative Analyst’s Office (LAO) and the Secretary of State describe covered assets as including businesses, securities, art, collectibles and intellectual property. Real estate, pensions and some retirement accounts generally would be excluded. The measure would direct 90% of proceeds to public health-care services; the balance would support education, food assistance and tax administration.
The initiative would also exempt its proceeds from certain constitutional spending rules, including requirements concerning school funding, budget reserves and state spending limits. Those provisions affect how the money is handled under existing rules; they do not make the revenue estimate more certain.
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Who would pay, and how would the state value assets?
The proposed tax is tied to California residency on January 1, 2026, not simply to whether someone lives in the state when payment is due. Its reach would depend on the measure’s rules for identifying covered people, assets, liabilities and net worth.
California does not traditionally value and tax personal property in the way Proposition 40 would require. CalMatters reported that implementation would involve valuing assets such as shares, investment accounts, business interests, art, wine and cars. Publicly traded stock has observable market prices; privately held companies and bespoke assets can be harder to value and may invite disputes. Experts interviewed by CalMatters differed on the overall difficulty, and the publication reported that they expect litigation. Those are expert assessments, not settled legal findings about how every asset would be valued.
The proposed act anticipates challenges to its validity and provides for expedited proceedings. That does not resolve whether the measure would survive a court challenge or how particular assets would be assessed.
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How much money might it raise?
The LAO forecasts that Proposition 40 probably would raise tens of billions of dollars over several years. It cautions that both the amount and timing are very hard to predict because wealth values fluctuate and taxpayers may take steps to reduce their liability. This is a forecast, not money already collected or a guaranteed amount available in a particular year.
The LAO also says taxpayer responses could reduce state income-tax revenue by less than $1 billion per year, and estimates that administration could cost tens of millions of dollars per year for several years. Both figures are forecasts. They describe potential effects alongside the tax receipts, not a definitive calculation of the initiative’s net fiscal result.
SEIU-UHW has stated a goal of raising $100 billion, mainly for the state’s Medicaid system following federal cuts, according to the Associated Press. That is the union’s target, not the LAO’s independent estimate.
Why are Democrats on opposite sides?
Supporters argue that federal health-care cuts make new state resources urgent and that billionaires should contribute to protect services. The official Yes-on-40 argument in the California voter guide says: “Trump slashed healthcare funding to pay for billionaire tax breaks, eliminating coverage for over a million Californians and doubling health insurance premiums for millions more.” It concludes, “It’s time to make billionaires pay their fair share and stop sticking the middle class with the bill.” These are campaign claims, not independent findings.
Opponents focus on the risks of a one-time tax, its possible effects on the broader tax base and the difficulty of implementing it. The official No-on-40 argument calls the proposal “a flawed, one-time tax scheme that hurts our economy, damages our state budget, and contains a loophole exposing all Californians to taxes we can’t afford—but does nothing to lower healthcare costs.” It ends: “No safeguards, no accountability.” That is the opposition campaign’s characterization, not an independent fiscal conclusion.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problems| Question | Supporters’ case | Opponents’ case |
|---|---|---|
| Health-care funding | A large infusion could help protect public health-care services when federal cuts are putting pressure on coverage and state programs. | A one-time levy does not provide a recurring funding stream, and opponents argue it would not lower health-care costs. |
| Revenue and budget risk | The tax could bring in tens of billions of dollars over several years, according to the LAO. | The LAO warns that receipts and timing are hard to predict, while taxpayer responses could reduce income-tax revenue and administration would carry costs. |
| Administration | Supporters see the proceeds as a way to fund services; SEIU-UHW has proposed a lower-rate alternative as part of a compromise effort. | Asset valuation across businesses and personal property could be complex, and opponents contend the design lacks adequate safeguards. |
The named supporters in the voter guide include Sanders and SEIU-UHW. Named opponents include the California Teachers Association, California Medical Association, California Children’s Hospital Association, California Professional Firefighters and State Building and Construction Trades Council of California. Newsom is also opposed. The split therefore crosses labor, health and education constituencies rather than tracking a simple party line.
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SEIU-UHW offered Newsom a compromise of a 2% tax instead of the initiative’s 5%, in exchange for his support of a legislative alternative and withdrawal of Proposition 40. The governor’s office said the lower rate did not change his opposition, the Associated Press reported. UCLA political science professor Martin Gilens told AP: “There’s kind of a perfect storm that sort of bolsters preexisting inclinations to be sympathetic to the idea of raising taxes on the well-to-do.”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What could complicate the measure even if voters approve it?
The LAO identifies a specific interaction with two other proposed ballot measures. Proposition 40 could be prevented from becoming law even if it receives a majority of yes votes if Proposition 41 or Proposition 42 receives more yes votes and a court finds the measures conflict. Whether either measure will affect Proposition 40’s outcome remains unresolved.
Implementation and litigation are separate uncertainties: the state would need to value varied assets and administer the tax, while courts could be asked to decide legal questions about the initiative. Neither the outcome of such challenges nor their effect on collections is established.
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What is the status of Proposition 40?
California announced on June 17, 2026, that the measure qualified for the November 3 general-election ballot. The Secretary of State listed 874,641 valid signatures as the qualification threshold and 962,106 projected valid signatures as the random-sampling threshold. These are signature figures, not votes or polling results.
As of its October 1, 2026 explainer, CalMatters reported more than $138 million in campaign spending by Sergey Brin and more than $205 million raised by opponents. Campaign-finance totals can change quickly; these figures describe the reported status on that date, not final totals.
What is at stake for voters?
The central choice is whether the prospect of substantial, near-term health-care funding justifies a one-time tax whose receipts are difficult to forecast and whose administration could involve contested valuations. The LAO’s estimate supports the possibility of very large revenue, but its warnings about timing, taxpayer responses and administration mean that the estimate is not a promise of a stable annual funding source.
For voters, the practical questions are whether the proposed destination for most proceeds is worth the fiscal uncertainty, whether the state can value and collect the tax as written, and whether legal conflicts or court challenges could alter the result. The campaigns answer those questions differently; the revenue forecast and implementation concerns should be weighed separately from their claims.
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