Google co-founder Sergey Brin has spent more than $100 million opposing California’s proposed billionaire tax, according to a report by TechCrunch, after making another $20 million contribution to a campaign group fighting the measure. The latest donation takes Brin’s reported spending against Proposition 40 beyond the $100 million mark, as the proposal heads towards a statewide vote in November.

Proposition 40 would impose a one-time 5% tax on the net wealth of roughly 200 billionaires who are residents of California. The measure is designed to raise billions of dollars, with a substantial share of the proceeds earmarked for healthcare. Based on estimates cited in the report, Brin’s potential liability under the proposal could reach about $13.3 billion given his reported fortune of roughly $267 billion.

The proposed tax has become part of a wider debate over California’s ability to retain its wealthiest residents and the businesses associated with them. Supporters argue that taxing billionaire wealth could provide significant resources for public services, while opponents warn that wealthy residents could relocate to states with lower taxes. The debate has intensified as California faces potential changes to federal healthcare funding.

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Brin is not the only technology billionaire whose finances and residency have come under scrutiny amid the discussion. Meta founder Mark Zuckerberg reportedly purchased a $170 million property near Miami this year, while former Uber CEO Travis Kalanick, venture capitalist Peter Thiel and Google co-founder Larry Page have also been reported to have left California. Such moves have added to concerns that a wealth tax could encourage high-net-worth residents to move elsewhere.

California Governor Gavin Newsom has also opposed the proposal, although his position is focused on pursuing a broader national approach to taxing billionaire wealth. Newsom has argued that the current tax system allows extremely wealthy individuals to access financial advantages that are unavailable to ordinary workers and has advocated changes targeting the use of stock-based borrowing and other strategies.

Californians are scheduled to vote on Proposition 40 in November. The campaign group receiving Brin’s financial support is also backing measures intended to restrict the introduction of new taxes, which could affect the proposal’s prospects. Meanwhile, Nvidia co-founder Jensen Huang has taken a different position, indicating that he is comfortable paying the proposed tax, highlighting the divide among America’s wealthiest technology executives over how billionaire wealth should be taxed.

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