Venture capitalist Peter Thiel has written his largest political check in years, contributing $3 million to a California business group that is leading the battle against a proposed billionaire wealth tax. This action positions the co – founder of Palantir as one of the earliest and most prominent financiers in an emerging campaign to halt the 2026 Billionaire Tax Act before it goes to the voters.
On December 29, Thiel made a $3 million donation to the California Business Roundtable, a powerful lobbying group based in Sacramento that represents large employers and corporate interests. This donation is the first publicly – linked seven – figure check opposing the billionaire tax proposal and is Thiel’s largest disclosed political gift since the 2022 mid – term elections. During those elections, he spent over $35 million supporting populist conservative candidates. on the donation, citing a public disclosure.
Although the money is not formally set aside only for the wealth – tax fight, the Roundtable is expected to be the central means for organizing and financing the business community’s efforts to defeat the measure. Rob Lapsley, the group’s president, across the state as part of a broader effort to rally corporate and elite support against the tax initiative and other proposals seen as unfriendly to business.
Inside California’s billionaire wealth tax
The proposal would impose a one – time 5% tax on the net worth of California residents whose wealth surpasses $1 billion. It targets assets such as privately held businesses, stocks, bonds, art, collectibles, and intellectual property rather than income. Real estate and certain pension and retirement accounts would be excluded, but otherwise, the measure aims to cover a wide range of financial and intangible assets in the portfolios of the ultra – wealthy.
If approved by voters, the tax would apply to anyone who is a California resident or part – year resident as of January 1, 2026. The tax bill would be calculated based on asset values at the end of 2026 and would be payable starting in 2027. Billionaires could choose to spread the payments over five years, but they would face an additional 7.5% annual non – deductible charge on the unpaid balance, effectively increasing the long – term cost for those who choose to defer.
Billionaires weigh exit or resistance
The news of the proposal has already triggered a wave of self – reflection among California’s ultra – wealthy. Some high – profile founders and investors are considering moving to other states or further reducing their ties to California. In recent years, at least several billionaires have already left the state, and business leaders warn that the tax could speed up an exodus and undermine the innovation ecosystem that supports California’s tech economy.
Thiel himself but remains closely connected to Silicon Valley through his investments and board positions, and his donation indicates a decision to fight the measure politically rather than just observing from a distance. He in 2023 that, in his view, real estate prices in Miami were too high. Other tech figures, such as investors Chamath Palihapitiya and Bill Ackman, have publicly criticized the tax, arguing that it would dampen entrepreneurship and risk – taking in the state.
A rare point of agreement with Newsom
In an unexpected alignment, some billionaire donors and Democratic Governor Gavin Newsom are on the same side of this fight. Newsom has come out against the billionaire tax, labeling it a bad policy and warning that just floating the idea has already damaged California’s reputation among the global wealthy.
The campaign regarding the tax is still in its early stages: supporters must collect nearly 900,000 valid signatures to get the measure on the November ballot, leading to months of high – stakes organizing on both sides. Opponents predict that more than $75 million could ultimately be spent to defeat the initiative, with Thiel’s $3 million check being the opening move in what is likely to be one of 2026’s most closely watched economic battles.
For this story, journalists used generative AI as a research tool. An editor verified the accuracy of the information before publishing.