California’s Billionaire Tax: Who Pays, and Why It May Still Fail

California’s proposed billionaire tax would take 5% of the net worth of the state’s richest residents, and the 10 wealthiest alone would owe about $31.5 billion. With the vote days away, support is slipping, rival measures could cancel it, and its fiscal case is under serious challenge.

On November 3, California voters will decide whether to impose a one-time 5% tax on the net worth of the state’s billionaires. On recent valuations, the ten wealthiest residents alone would owe roughly $31.5 billion. Meta chief executive Mark Zuckerberg faces an estimated bill of $10.9 billion. Nvidia chief executive Jensen Huang faces about $9.5 billion.

The measure, Proposition 40, is the most serious test yet of whether an American state can tax accumulated wealth rather than annual income. The result will reach well beyond California’s health budget. It will affect where founders choose to live, how boards design executive equity, and whether other high-tax states see wealth as a usable revenue base. With three days to go, the measure is losing support. Even a majority “yes” vote may not be enough to put it into effect.

How the California Billionaire Tax Would Work

The tax applies to individuals with a net worth above $1 billion who were California residents on January 1, 2026. Real estate, pensions and retirement accounts are generally excluded. Payment would be due in 2027. Taxpayers could spread it over five years, at an added cost.

Ninety percent of the proceeds would go to public health care services. The remaining 10% would fund education, food assistance and the cost of running the tax. The revenue would sit outside the state’s constitutional spending limit and its school-funding guarantee.

The state’s nonpartisan Legislative Analyst projects collections in the “tens of billions of dollars” over several years. The office stresses that both the timing and the amount are hard to predict. It also expects the state to lose less than $1 billion a year in ongoing income tax as some billionaires reduce their exposure, including by leaving.

The residency date is the measure’s least discussed and most important design feature. Because the tax is fixed to a January 2026 snapshot, a billionaire who leaves this year does not escape the one-time levy. High-profile departures, including those of Google cofounders Sergey Brin and Larry Page, matter for a different reason. They shrink the base that pays California’s income tax every year after the wealth tax is collected.

The measure’s main sponsor is the healthcare workers’ union SEIU-UHW, which has raised about $31 million. The California Democratic Party supports it. Governor Gavin Newsom opposes it, as do doctors’ groups and clinics. Newsom argues that it would not fix the state’s structural budget gap and would push wealthy residents and businesses out of the state.

A Tax Bill Concentrated in Two Names

The estimated liability is highly concentrated. Zuckerberg and Huang together account for about two-thirds of the top-ten total. Zuckerberg, now the richest person in the state with a fortune above $200 billion, is reportedly staying. Meta’s board agreed to create a new class of stock that he can sell to pay the tax.

Huang, worth more than $170 billion, has publicly backed the measure. “I’m not afraid of paying taxes. I’m just afraid of being poor,” he said.

Others are fighting it. Former Google chief executive Eric Schmidt, with an estimated bill of $1.8 billion, and venture capitalist John Doerr, at $1.1 billion, have each spent about $40 million against the measure. The remaining names in the top ten have not taken public positions. They are Broadcom cofounder Henry Samueli, Ubiquiti’s Robert Pera, Kingston Technology cofounders John Tu and David Sun, OpenAI president Greg Brockman and Figure founder Brett Adcock.

This concentration creates a revenue risk that headline totals hide. The state’s take would depend heavily on the share prices of two companies and on the decisions of a few individuals. As an illustration, a 20% fall in the value of the Meta and Nvidia stakes would remove about $4 billion from the top-ten total.

Liquidity events can also change who pays. Anthropic’s newly filed initial public offering could lift cofounders Dario and Daniela Amodei from about $13 billion each to more than $20 billion. That would raise each of their estimated bills from roughly $680 million to over $1 billion.

Why the Estimates Are Softer Than They Look

All published figures, including those above, rest on market-style valuations. The measure uses its own valuation rules. Assets held in certain trusts may lower taxable net worth. Private companies, which make up a large share of many founders’ fortunes, would be valued by a statutory method that could produce figures well above or below private-market estimates.

The practical result is that no one, including the taxpayers themselves, can yet state their liability with confidence. That uncertainty favors those with the resources to dispute valuations. It also makes early revenue projections unreliable inputs for budget planning.

The Three-Gate Test Facing Proposition 40

The measure’s prospects are best understood as three gates it must pass in sequence.

The electoral gate. A UC Berkeley poll conducted with the Los Angeles Times and released October 29 found 50% of likely voters opposed, 42% in favor and 8% undecided. Six weeks earlier, a narrow majority supported the measure. Spending explains part of the shift. Brin alone had given more than $100 million to the opposition coalition by August.

The countermeasure gate. Two rival measures appear on the same ballot. Proposition 41 would subject new taxes to the state’s 1979 spending limit, which the billionaire tax does not satisfy. Proposition 42 would ban new taxes on personal property and retroactive taxes. Under California’s conflicting-measure rules, if either receives more “yes” votes than Proposition 40, the wealth tax does not take effect, even if it wins a majority. Building a Better California, the billionaire-funded group behind both countermeasures, has raised $131 million.

The fiscal gate. Even if the tax is collected, its net value to the state is disputed. A National Bureau of Economic Research working paper by Stanford researchers modeled 100,000 scenarios. In 85% of them, lost income tax from departing billionaires exceeded the one-time windfall. The Legislative Analyst’s more modest estimate of income-tax losses points the other way. The gap between the two reflects differing assumptions about how many billionaires leave and how much income they would have reported over many years. A one-time payment is finite. A lost taxpayer is a permanent loss.

Supporters respond that the residency snapshot locks in the base, and that migration was already under way for unrelated reasons. Both points have merit. Neither fully addresses the long-term income-tax question. The retroactive design is also a likely target for legal challenge, which could delay collection beyond 2027.

Estimated Proposition 40 Liability, California’s Ten Richest Residents

Why This Matters for Business Leaders

The Meta arrangement sets a governance precedent. Creating a share class to fund a chief executive’s personal tax bill raises questions about dilution, disclosure and fairness to other shareholders. Boards elsewhere should expect to be asked whether their companies would do the same.

The measure also makes domicile a board-level issue. Where founders and controlling shareholders live now affects succession planning, key-person risk and, in some cases, the location of headquarters.

Finally, the installment option reduces but does not remove the risk of forced selling. Holders of concentrated stakes facing multi-billion-dollar liabilities will need structured selling programs, collateralized borrowing or the kind of company-facilitated liquidity Meta has offered.

Executive Takeaways

• What changed: California voters will decide on November 3 whether to impose a one-time 5% tax on billionaire net worth, with roughly $31.5 billion at stake from the ten richest residents alone.
• Why it matters: The measure tests whether wealth can be taxed at the state level, and it turns residency, valuation and liquidity into strategic questions for founders and boards.
• What leaders should do next: Companies with California-based controlling shareholders should review how a tax-driven sale, pledge or new share class would affect governance, disclosure and the share register, whatever the outcome of the vote.

The vote is only the first gate. If Proposition 40 survives the ballot, executives should watch four things over the next 12 to 24 months: court rulings on its retroactive design, the regulations governing private-company valuation, the size and timing of 2027 collections, and income-tax data showing whether wealthy taxpayers are leaving the state. The most important uncertainty is not whether California can collect tens of billions once. It is whether doing so costs the state more in the years that follow.

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