California voters appear to have rejected Proposition 40, the landmark initiative that would have imposed a one-time 5% tax on the state's billionaires, handing Silicon Valley's wealthiest residents their most expensive ballot victory ever. Votes are still being tallied, but the direction is clear — and the strategic consequences reach well beyond one state.

Voters also appear to favor Proposition 42, a countermeasure that would hamstring future attempts to tax financial assets — the holdings that separate the rich from the really rich. More than 200 billionaires live in California, holding an estimated $2.3 trillion in combined wealth. UC Berkeley economist Gabriel Zucman notes that sum roughly equals the combined annual income of every resident in the state.

That the most progressive state, with the highest wealth inequality in the country, made these choices in the bluest national election in recent history reads either as a failure of populism or a victory of free enterprise, depending on who you ask. Mike Solana of Peter Thiel's Founders Fund celebrated Prop 40's apparent defeat on X with the words: "Eat shit, communists."

What did the money buy?

The opposition coalition — including Sergey Brin, Patrick Collison, Eric Schmidt and John Doerr — spent more than $300 million to defeat the measure, including a reported $148 million ad campaign. That is the most ever spent by one side on a single ballot initiative. Supporters spent about $2 million on ads.

"The disparity in money in this thing was too high," says Cooper Teboe, a political strategist in Silicon Valley. "There was a genuine marketing gap."

The scale of the spending gap matters for anyone planning policy campaigns against concentrated wealth: a 150-to-1 advertising advantage is now the documented price of defeating a billionaire tax in a sympathetic state.

Why the tax targeted assets, not income

Wealth for this class is not a matter of salary but of assets. Most tech fortunes sit in company equity, untaxed until shares are sold. That structure has allowed some of the state's richest people to pay remarkably little in income tax — Mark Zuckerberg, Larry Ellison and Larry Page all famously take $1 salaries.

"The way this system works is they can literally create gigantic fortunes without paying tax," says Tom Steyer, the investor and former gubernatorial candidate, and one of the few billionaires to back the tax. "We know where we need to go, which is a fairer tax system."

Supporters framed Prop 40 as a long-overdue correction that would still leave billionaires very, very rich. "The poorest billionaire in California will make about $300 million this year. If we pass the CA wealth tax, he will only make $235 million," Saikat Chakrabarti, a former Stripe engineer and political adviser, wrote on X.

Critics argued that demanding cash on paper wealth would ruin the tech economy, force billionaires to sell stakes in private companies and trigger an exodus. Earlier this year, investor Balaji Srinivasan noted on X that Larry Page, Sergey Brin, Elon Musk and Peter Thiel had already "exited the failed state of California." Y Combinator CEO Garry Tan warned that a billionaire tax would push startup founders to avoid the state entirely.

Money is not everything — Texas proves it

The California result does not mean spending guarantees outcomes. In Texas, Elon Musk spent nearly $500 million trying to keep Republicans in office; voters elected a Democratic governor for the first time since 1991 and a Democratic senator who made reining in data centers a central campaign theme. Both campaigns ran on "top versus bottom" rather than "left versus right" politics — class alignment above partisan identity.

The contrast sets up the next round: roughly 46% of California voters backed the tax despite what many saw as significant flaws, and national polling runs strongly against the ultra-wealthy. One national survey from last year found 73% of Americans would favor a "special additional tax on billionaires." An April Pew survey found 60% of people believed corporations and the very wealthy do not pay "their fair share."

Where the fight moves next

Some Prop 40 detractors, including Governor Gavin Newsom, argued they would rather tax wealth federally than at the state level. Other opponents — those with grievances about the measure's fiscal impact, how the state would assess wealth, and where the revenue would go — have come out in support of wealth taxes in general.

Steyer, who backs a federal tax on billionaires, says that if Prop 40 is "not the way to skin the cat, don't come back and tell me there's no way to skin the cat."

The stakes will grow. Companies like Anthropic and OpenAI are preparing world-historic IPOs; Anthropic's alone could mint close to a thousand centimillionaires, swelling the ranks of exactly the asset-holding class any wealth tax would target.

For practitioners, the lesson is sequencing: a credible plan for taxing the ultra-rich "becomes almost a prerequisite for whoever ends up as the dominant 2028 candidate," Teboe says.

"The war continues."