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Tech Billionaires Spend Over $120M to Block California Wealth Tax

WireByte Staff · July 5, 2026

Tech billionaires have poured over $120 million into fighting California's Proposition 40, a one-time 5% wealth tax on billionaires. Google co-founder Sergey Brin leads the opposition with $82 million, while supporters have raised $31 million. The tax, proposed for November's ballot, aims to fund healthcare, food assistance, and education.

Key points

  • Proposition 40, a one-time 5% wealth tax on California's roughly 200 billionaires, is set to appear on November's ballot.
  • The opposition, led by Google co-founder Sergey Brin, has raised over $120 million to block the tax.
  • Brin, the world's third-richest person according to Bloomberg, has moved his assets out of state and donated $82 million to the opposition.
  • Supporters, backed by unions, have raised $31 million to fund the tax, which would generate an estimated $100 billion in revenue.
  • The tax would fund healthcare, food assistance, and education, with proponents arguing it's necessary to address California's wealth gap.

Tech billionaires have poured over $120 million into fighting California's Proposition 40, a one-time 5% wealth tax on billionaires. Google co-founder Sergey Brin leads the opposition with $82 million, while supporters have raised $31 million. The tax, proposed for November's ballot, aims to fund healthcare, food assistance, and education.

The opposition has been vocal in their criticism of the tax, with Brin comparing it to Soviet socialism. He has also moved his assets out of state, taking advantage of a key January deadline. Other tech billionaires, including Doerr, Moritz, Collison, Schmidt, Larsen, and Thiel, have also donated to the opposition.

Supporters of the tax, backed by unions, argue that it's necessary to address California's wealth gap. They estimate that the tax would generate $100 billion in revenue, which would be used to fund healthcare, food assistance, and education. The tax would apply to residents and trusts worth over $1 billion.

The outcome of the ballot measure is uncertain, but one thing is clear: the tech industry is pulling out all the stops to block it. As the November election approaches, the debate over Proposition 40 will only continue to intensify.

Sources

WireByte Staff — Editorial Team

The WireByte editorial team synthesises technology news from multiple primary sources, verifies the facts, and links every source. Articles are produced with AI assistance and reviewed under our editorial policy.