When the math works out to spending $100 million to avoid a $13.3 billion obligation, most people would call that a sound investment. Sergey Brin, Google co-founder and the world’s fourth-richest person with a net worth hovering around $267 billion, appears to see it exactly that way. A recent campaign finance filing confirms Brin donated another $20 million to Build a Better California, pushing his total contribution against the state’s proposed billionaire tax past the nine-figure mark.
What California’s Prop 40 Actually Does
California’s Proposition 40, commonly called the billionaire tax, would impose a one-time 5% levy on the net worth of roughly 200 billionaires residing in the state. For Brin, that figure lands at an estimated $13.3 billion. The revenue generated would primarily fund California’s healthcare programs, which is no small concern given that the state’s Medicaid program alone faces a potential loss of up to $30 billion in federal funding once recently announced budget cuts take effect.
The math behind the opposition spending is striking. Brin has now committed more than $100 million to campaigns and ballot measure organizations working to block or counter Prop 40. The organization he funds has backed opposing ballot measures that, if passed, would effectively restrict the introduction of new taxes in California entirely.
Tech Billionaires Are Voting With Their Zip Codes
Brin is far from alone in his resistance. Former Uber CEO Travis Kalanick, venture capitalist Peter Thiel, and Google co-founder Larry Page have all relocated out of California in recent years. Mark Zuckerberg reportedly purchased a $170 million estate near Miami this year, a move widely interpreted as strategic given Florida’s lack of state income tax.
Governor Gavin Newsom has broken with progressive supporters of Prop 40, expressing concern that driving billionaires and their companies out of California could damage the broader economy. Newsom has instead championed the idea of a national billionaires’ tax, arguing that the real problem is systemic. He has specifically called out the practice of ultra-wealthy individuals borrowing against stock portfolios to fund their lifestyles while reporting little to no taxable income, a strategy sometimes called the buy-borrow-die approach.
Not every tech titan is playing defense. Nvidia co-founder Jensen Huang, who would owe an estimated $8 billion under Prop 40, has publicly stated he has not given the tax a second thought and is fully prepared to pay whatever California asks. His stance has earned him an unusual amount of goodwill from the general public.
What This Means for Tech Investment and Consumer Confidence
California voters will decide on Prop 40 in November, and the outcome carries real consequences for the tech industry’s footprint in the state. If major technology companies follow their founders to lower-tax states, that migration reshapes where talent concentrates, where startups get funded, and ultimately where consumers find the most competitive products and services. For anyone tracking tech adoption trends or evaluating where the next generation of innovation will emerge, this ballot measure is worth watching very closely.
