SACRAMENTO, California, November 10, 2026 — California voters have rejected Proposition 40, a ballot measure that would have imposed a one-time tax on the covered wealth of the state’s billionaires, dealing a setback to labour unions and progressive politicians who argued that the money was needed to protect healthcare and other public services from federal funding cuts.
The Associated Press projected the measure’s defeat on Monday, with the count reported by CalMatters showing 52.8% against and 47.2% in favour. The result is politically significant, but it is not yet a certified final tally: California’s official canvass continues, county election officials have until December 3 to complete final results, and the Secretary of State is scheduled to certify them on December 11.
Proposition 40 was unusual because it sought to tax accumulated wealth rather than annual income. It would have applied a one-time levy to certain assets held by California residents with billionaire-level wealth, with most of the proceeds directed to healthcare. Its defeat leaves unresolved a national argument over whether large fortunes should contribute more directly to the cost of public services, and whether a state can impose such a tax without encouraging wealthy residents and businesses to move elsewhere.
The official voter guide described Proposition 40 as a one-time tax on certain taxpayers. Under the proposal, people who were California residents on January 1, 2026, and whose covered wealth exceeded the threshold would have faced a tax of 5% of their net worth. The payment would have been due in 2027, although taxpayers could spread it over five years by paying an additional amount. Real estate, pensions and retirement accounts generally would have been excluded from the calculation.
The measure was not an annual tax on billionaires and it was not a tax on every asset a person owned. The official summary covered businesses, securities, art, collectibles and intellectual property, subject to the measure’s valuation rules and exclusions. That distinction mattered because the proposal was aimed at wealth accumulated through ownership and investment, including stakes in companies, rather than only at wages or other income earned in a particular year.
Proposition 40 also set rules for how the money could be spent. Ninety per cent of the revenue would have been reserved for healthcare services for the public. The remainder would have gone to education, food assistance and administration of the tax. The measure’s supporters argued that the funding could help replace part of the federal support being withdrawn from health programmes and protect people who rely on Medi-Cal and other services.
The state’s Legislative Analyst said the tax could raise tens of billions of dollars over several years, but warned that the total was difficult to predict. The value of shares and privately held businesses can change sharply, while taxpayers may take steps to reduce their liability. The analysis also said that some billionaires could leave California, reducing the state income-tax revenue they currently pay. The projected ongoing loss from such responses was estimated at less than $1 billion a year, although the actual effect would depend on how taxpayers reacted.
Supporters put forward a much larger campaign estimate. Service Employees International Union-United Healthcare Workers West said the one-time tax could generate about $100 billion for healthcare and education. That was a campaign estimate, not the official Legislative Analyst’s forecast. The difference between the two figures became part of the wider argument about how much revenue the measure could realistically deliver and how much uncertainty the state would take on in exchange.
The proposal had prominent support from Senator Bernie Sanders and labour organisations, including the union that sponsored the initiative. Supporters framed it as a way to make the wealthiest residents contribute more to services that benefit the wider population, particularly at a time when federal healthcare policy was expected to put additional pressure on state budgets. They argued that a one-time charge on a small group of exceptionally wealthy people was preferable to asking lower- and middle-income households to absorb the consequences of funding cuts.
But the proposal also divided California Democrats. Governor Gavin Newsom opposed it, warning that a wealth tax could make the state less attractive to entrepreneurs and investors. His concern was that people with large business holdings could relocate, shift assets or change where they establish new ventures. If that happened, California could lose some of the income-tax revenue and employment activity associated with the companies and investors it has attracted over many years.
The opposition was not limited to Republicans or business groups. Several Democratic leaders and organisations that usually support public-service funding measures questioned whether a one-time levy was a reliable way to finance long-term healthcare commitments. Some argued that a temporary pool of money could not provide a durable answer to recurring costs, particularly if the state had to manage the tax’s administration, valuation disputes and possible legal challenges.
Those concerns were sharpened by the proposal’s treatment of assets. A publicly traded share has a visible market price, but the value of a privately held company, a founder’s stake, intellectual property or a complex investment structure can be harder to establish. A tax authority would need rules for valuation, appeals, payment timing and the treatment of assets whose value changes between the assessment date and collection. The official guide recognised that stock prices and taxpayer responses could affect how much money the state ultimately received.
The debate also exposed a tension between California’s identity as a centre of technology entrepreneurship and its desire to raise more revenue from the people who benefited most from that growth. Supporters said the state’s economic success had produced fortunes large enough to make a one-time contribution reasonable. Opponents argued that the same mobile capital could move elsewhere, weakening the tax base and making it harder for California to compete for new companies.
Neither argument by itself establishes what would have happened if the measure had passed. The state’s fiscal analysis identified possible revenue and behavioural effects, but it could not predict how many people would leave, how businesses might reorganise or how courts would resolve disputes over particular assets. The ballot campaign therefore asked voters to choose between competing assessments of risk as well as competing views of tax fairness.
Campaign spending became one of the defining features of the contest. CalMatters reported that opponents of Proposition 40 and related measures contributed about $378 million, while the campaign supporting the billionaire tax raised roughly $33.5 million. Reuters separately reported that Google co-founder Sergey Brin and at least 11 other billionaires contributed a collective $269 million to a political committee that spent more than $300 million opposing Proposition 40.
The figures reflect different committees and campaign totals, but both accounts show the scale of the financial imbalance. Opponents argued that the measure would encourage wealthy residents to leave and could weaken the state’s economy. Advertising also sought to portray the proposal as a threat to retirement savings or a precedent for wider taxation. Supporters said the spending demonstrated how much influence billionaires could exert when a proposal directly affected their assets.
Money was not the only factor. Newsom’s opposition gave moderate and business-oriented Democrats a prominent reason to reject the measure, while divisions among labour groups complicated the campaign’s effort to present it as a straightforward choice between wealthy taxpayers and public services. CalMatters reported that support had weakened during the campaign and that the union behind the initiative had indicated it might return with another proposal if the Legislature failed to find a solution for healthcare funding.
Affordability concerns also formed part of the political backdrop. Voters were weighing the proposal during a period of pressure from household costs, including fuel prices, while the campaign connected the tax to the effects of federal healthcare changes. Those issues did not produce a single, uniform response. Some voters saw a one-time contribution from billionaires as a way to protect services; others were unconvinced that the proposed tax would deliver the promised revenue without creating longer-term costs.
The rejection does not show that Californians oppose every tax increase on the wealthy. It records the outcome of one particular proposal, with a specific rate, asset base, funding allocation and implementation timetable. The result should not be read as a direct referendum on all forms of wealth taxation or on every policy designed to protect healthcare funding.
The immediate consequence is that Proposition 40 will not create the proposed one-time revenue stream for healthcare, education and food assistance. State lawmakers and the governor will have to address those funding pressures through the existing budget process and other policy choices. The vote does not itself determine the size of future federal cuts, the level of state spending or whether California will adopt a different tax measure.
For healthcare providers and residents who rely on public programmes, the central question is how the state will respond to any reduction in federal support. The proposal’s supporters argued that a dedicated fund could provide a buffer. Its opponents questioned whether a one-off tax could reliably support services that require funding every year. Those are different fiscal problems: a temporary windfall can help meet immediate costs, but it cannot automatically replace a recurring source of revenue.
The result is also likely to be studied by lawmakers in other states considering wealth-tax proposals. California has a large concentration of technology founders, investors and high-value businesses, making it a prominent test case for policies aimed at taxing accumulated wealth. The campaign showed how questions of valuation, migration, administrative capacity and political spending can shape a proposal long before any tax is collected.
At the federal level, the debate is not over. Reuters reported that incoming Senate Finance Committee Chairman Ron Wyden has signalled that Democrats will continue to pursue policies aimed at making billionaires pay more. Sanders and other supporters of Proposition 40 have also argued that the issue should remain part of the national discussion. A future proposal could take a different form, including a recurring tax, a change to capital-gains rules or a different approach to closing tax advantages used by very wealthy households.
For the union that backed Proposition 40, the next step will depend partly on whether state lawmakers produce an alternative healthcare funding plan. SEIU-United Healthcare Workers West said it could try again in 2028 if the Legislature fails to deliver what it considers a workable solution. That is a stated intention, not a formal filing or a confirmed future ballot campaign.
The official election process will continue after the media projection. California’s Secretary of State says county officials must complete final results by December 3 and the state will certify the results on December 11. The final canvass may adjust vote totals, but the AP projection and the reported margin point to a clear defeat for the measure.
Proposition 40’s failure leaves two questions in place. One is practical: how California will protect healthcare and other services if federal support is reduced. The other is political: whether voters will support a different way of taxing large fortunes, or whether the concerns raised about capital mobility and the state’s business climate will continue to dominate the debate. The November vote answers the first ballot question, but it does not settle either argument.