Silicon Valley’s wealthiest figures are escalating their opposition to a proposed California tax on billionaires, with Google co-founder Sergey Brin more than doubling his financial contribution to the effort. New filings reveal Brin has donated an additional $25 million to a Super PAC working to block the tax, bringing his total investment to $45 million. The surge in funding underscores the high stakes surrounding the “California Billionaire Tax Act,” a ballot measure that could reshape the state’s revenue landscape and significantly impact its wealthiest residents.
The proposed tax, if approved by voters this November, would impose a one-time 5% levy on the assets of California residents worth more than $1 billion. Proponents, led by the Service Employees International Union-United Healthcare Workers West, argue the tax would generate much-needed funds for education, food assistance, and healthcare programs. However, opponents contend it’s poorly designed and could drive wealth—and the individuals who create it—out of the state. The debate over the billionaire tax highlights a growing tension between progressive taxation and concerns about economic competitiveness in California.
Brin isn’t alone in his opposition. Former Google CEO Eric Schmidt has likewise increased his financial stake, contributing $1.02 million on top of a previous $2 million donation, for a total of just over $3 million. Both are directing their funds to Building a Better California, a Super PAC formed to fight the tax and advance what it describes as “long-term policy reforms” for the state. The PAC also supports a separate ballot measure, dubbed “Protect Retirements,” which aims to prevent the retroactive application of the tax, a key concern for those who fear it could impact previously realized gains.
The potential financial impact on Brin himself is substantial. Valued at approximately $247 billion, according to Bloomberg, he could face a tax bill exceeding $12 billion under the proposed measure. This financial exposure appears to have factored into his decision to relocate from California to a $42 million estate on the northeastern shore of Lake Tahoe in Nevada, a move documented by Realtor.com. His PAC donations now list Reno, Nevada, as his address, signaling a formal shift in residency.
Concerns Over Tax Implementation and Scope
Critics of the billionaire tax raise concerns about its practical implementation. The Tax Foundation, a non-profit research organization, has pointed out that the proposal’s language could artificially inflate the taxable wealth of company founders by treating their voting shares as equivalent to full ownership. This, they argue, could force founders to sell off significant portions of their shares, potentially destabilizing stock prices and harming tech employees and investors.
Further fueling opposition is the argument that the tax could extend beyond its intended target. Former Facebook executive Chamath Palihapitiya recently wrote on X (formerly Twitter) that the bill’s wording allows the California legislature to apply the asset tax to non-billionaires, potentially encompassing assets like cars, homes, and jewelry. “California isn’t coming just for the rich,” he asserted, suggesting the tax could become a broader revenue grab.
Broader Political Implications
The fight over the billionaire tax is unfolding against the backdrop of a closely watched California gubernatorial election. Brin has also contributed financially to the campaigns of both Steve Hilton, the Republican frontrunner, and Democrat Matt Mahan, who is viewed as tech-friendly and enjoys support within Silicon Valley. These contributions suggest a broader effort to influence the political landscape in a direction favorable to the tech industry.
Building a Better California has also attracted significant donations from other prominent tech leaders, including Palantir co-founder Peter Thiel ($3 million), Ring founder James Siminoff ($100,000), and crypto billionaire Chris Larsen ($750,000). DoorDash CEO Tony Xu ($2 million) and Stripe CEO Patrick Collison ($7 million) have also contributed to the PAC. The California Business Roundtable, another Super PAC opposing the tax, has received $1.04 million from Schmidt, as well as contributions from Thiel, Siminoff, and Larsen.
A Pattern of Political Engagement
Brin’s increased political involvement extends beyond financial contributions. He attended a White House dinner last year where, according to reports, former President Trump referred to his girlfriend, wellness influencer Gerelyn Gilbert-Soto, as a “really wonderful Maga girlfriend.” Brin’s former wife, Nicole Shanahan, was previously Robert F. Kennedy Jr.’s running mate in the 2024 presidential election. Schmidt, whereas less visible in the Trump White House, has a history of engagement with both Democratic and Republican administrations.
Abby Lunardini, a spokesperson for Building a Better California, stated the group is “thankful for the billionaires’ support” and remains focused on “long-term policy reforms” in the state. “We believe in public investments in housing, infrastructure, and education, but also that Californians deserve more accountability and safeguards for their tax dollars,” she said.
The next key step in the process is gathering enough signatures to qualify the “California Billionaire Tax Act” for the November ballot. The outcome of this effort, and the subsequent vote, will have significant implications for California’s budget, its wealthiest residents, and the broader debate over wealth inequality. The state’s election officials are expected to announce whether enough signatures have been collected by late summer.
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