# Sergey Brin Builds Lasting Political Infrastructure Against California Wealth Tax Google cofounder shifts from political sidelines to leading a massive billionaire-funded campaign. - **Source:** [Fortune | FORTUNE](https://brifing.si/source/769282ef-327a-4454-909a-3c7936216004) - **Published:** 2026-11-02 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/9742d096-125a-4a97-9f02-eba979279dcb ## Shift in Political Engagement Google cofounder Sergey Brin has transitioned from a political bystander to a central financier for California’s ultrawealthy. He established the organization Building a Better California to coordinate opposition against a proposed wealth tax. Brin has personally contributed $102 million to this vehicle, signaling a long-term commitment to shaping state policy beyond immediate ballot fights. ## The Wealth Tax Mechanism Proposition 40 proposes a 5% tax on assets for California residents worth over $1 billion as of January 1, 2026. Sponsored by the Service Employees International Union-United Healthcare Workers West, the measure aims to offset federal healthcare funding cuts. Proceeds are designated 90% for healthcare and 10% for education and food assistance. ## Strategic Counter-Ballot Measures Building a Better California has spent over $304 million to defeat Proposition 40 while advancing Propositions 41 and 42. Proposition 41 mandates state audits of special tax programs, while Proposition 42 outlaws retroactive taxation. These measures create a legal framework where the wealth tax could be blocked even if voters approve the primary initiative. ## Billionaire Coalition Dynamics The organization serves as a hub for Silicon Valley elites, including John Doerr, Eric Schmidt, Patrick Collison, and Michael Moritz. Mark Cuban also joined the opposition, publicly criticizing the tax on social media. This coalition represents a record $612 million in total spending by billionaires during the 2026 California election cycle to influence state policy. ## Brin’s Personal Financial Stakes With a fortune estimated at $231 billion, Brin faces substantial exposure to the proposed 5% asset levy. He relocated to Nevada in December 2025 to potentially avoid the tax’s residency requirements. Brin has publicly compared the proposal to socialism, citing his upbringing in the Soviet Union as a primary driver for his vocal opposition. ## Internal Coalition Disagreements While the group is united against the wealth tax, internal friction exists regarding broader political spending. Eric Schmidt reportedly diverged from Brin’s strategy of funding unrelated measures like Proposition 45, which addresses environmental review processes. Schmidt’s advisors clarified his focus remains strictly on defeating the billionaire tax rather than the group’s wider policy platform. ## Legislative and Political Support The wealth tax initiative maintains backing from prominent progressive figures, including Senator Bernie Sanders and Representative Ro Khanna. Proponents argue that the state requires these additional funds to protect healthcare coverage for residents. The Legislative Analyst’s Office projects the tax could generate tens of billions of dollars for the state over several years. ## Long-term Political Infrastructure Brin’s investment indicates a permanent shift in how tech billionaires engage with state-level governance. By building a lasting political organization, these donors are creating a mechanism to influence California’s direction long after the November 3 vote. This infrastructure marks a new era of organized, high-capital intervention in state electoral politics by private individuals. ## Sources covering this story - https://fortune.com/2026/11/02/sergey-brin-political-102-million-prop-40-billionaire/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._