California Proposition 40 Puts Billionaire Wealth Tax at Center of Health Care Funding Battle

The November ballot measure proposes a one-time 5% tax on billionaires’ wealth, directing most of the proceeds toward health care as California confronts looming funding cuts.

California voters are preparing to decide whether the state should impose a one-time wealth tax on billionaires to help fund health care, putting Proposition 40 at the center of a growing debate over economic inequality, public spending and the future of Silicon Valley.

Scheduled for the November 3, 2026, general election, Proposition 40 would impose a tax of up to 5% on the covered assets of qualifying billionaires who were California residents on January 1, 2026.

Supporters say the measure could generate tens of billions of dollars to help protect essential services as federal funding reductions threaten the state’s health care system.

How Proposition 40 Would Work

The proposed tax targets people with more than $1 billion in covered assets, including stocks, business interests, artwork, collectibles and intellectual property. Real estate and certain pensions and retirement accounts would generally be excluded.

Under the measure, 90% of the revenue would be allocated to health care, with the remaining 10% directed toward food assistance or education-related programs. The money could not be used simply to replace existing state funding for those purposes.

Payments would begin in 2027, with an option to spread them over five years at a higher overall cost.

The state’s nonpartisan Legislative Analyst’s Office estimates that the measure could generate tens of billions of dollars over several years, although the final amount remains uncertain.

Supporters Say Health Care Needs the Money

The initiative was championed by Service Employees International Union–United Healthcare Workers West, which argues that California needs additional resources to offset federal health care funding cuts.

Supporters contend that the tax could help preserve access to medical care, protect hospitals and clinics, and reduce the risk that vulnerable residents lose coverage.

They argue that billionaires who have accumulated enormous fortunes can contribute more toward maintaining public services.

The proposal has also attracted support from progressive political figures, including U.S. Sen. Bernie Sanders, alongside labor unions and other advocates for taxing extreme wealth.

Silicon Valley Pushback

The proposal has sparked fierce opposition among business leaders, technology investors and some health care and labor organizations.

Critics warn that taxing accumulated wealth could encourage billionaires to move out of California, potentially reducing future income tax revenue and weakening the state’s appeal as a destination for entrepreneurs and investors.

Opponents also question whether a one-time tax can provide a reliable solution to long-term health care funding challenges. They argue that California needs sustainable funding strategies rather than a measure that generates a large but temporary financial windfall.

The debate is particularly significant in the Bay Area, where technology companies and billionaire founders play a major role in the regional economy.

A Costly Political Fight

Proposition 40 has also become the focus of a major campaign spending battle. According to The Guardian, opponents had raised more than $340 million by mid-October, substantially exceeding the funding available to supporters.

The campaign has exposed divisions among California Democrats, with some labor groups backing the tax while others oppose it.

The measure also faces a complication from Propositions 41 and 42, competing ballot measures designed to counter its effects. Under the ballot framework described by CalMatters, Proposition 40 would take effect only if it receives more votes than both competing measures.

What It Means for California Residents

For ordinary Californians, the outcome could influence access to health care, state budget priorities and the future of public services.

Supporters see the measure as a way to cushion the impact of federal cuts, while opponents warn that its economic consequences could extend well beyond the billionaires who would pay the tax.

The November vote will test whether California voters are willing to pursue an unprecedented state-level wealth tax to support essential services, despite concerns about investment, tax revenues and the state’s long-term economic competitiveness.

Proposition 40 is therefore about more than taxing billionaires. It is a debate over who should pay for California’s public services, how those services should be funded and what trade-offs the state is willing to accept to protect health care.