A high-stakes political battle is intensifying in California as some of the world’s wealthiest individuals launch a massive campaign to block a new tax proposal. The “2026 Billionaire Tax Act” seeks to impose a one-time 5% excise tax on the global net worth of California residents who are worth $1 billion or more. If passed by voters in November 2026, the measure would apply to approximately 200 individuals and is estimated to raise $100 billion for state healthcare, education, and food assistance programs.
The Massive Financial Pushback
The tech industry is not waiting for the election to start fighting. Recent state filings show that Google co-founder Sergey Brin has contributed $45 million to a Super PAC called “Building a Better California.” This group is dedicated to stopping the wealth tax and promoting other measures that would make it harder for the state to collect such a levy.
Brin is joined by a long list of Silicon Valley elite who are funding the opposition. Other major donors to anti-tax efforts include:
Eric Schmidt (former Google CEO): $3 million
Patrick Collison (Stripe CEO): $7 million
Peter Thiel (Palantir co-founder): $3 million
Tony Xu (DoorDash CEO): $2 million
These leaders argue that the tax is not just about money, but about the ability to keep control of the companies they built. Because many billionaires have their wealth tied up in company stock, a 5% tax might force them to sell large amounts of shares quickly. This could cause stock prices to drop and lead to them losing voting control over their own businesses.
The Threat of “Billionaire Flight”
One of the biggest concerns for California’s economy is the potential exodus of its wealthiest citizens. Since the tax uses a residency date of January 1, 2026, many billionaires reportedly moved their official homes out of the state before the start of the year to avoid being caught by the law.
Sergey Brin recently relocated to an estate in Nevada, and Peter Thiel has reportedly moved his primary residence to Florida. Even Governor Gavin Newsom has expressed worry about the proposal, calling it “really damaging” and warning that it could drive away the people who provide a large portion of the state’s income tax revenue.
Abby Lunardini, a spokesperson for the Building a Better California PAC, explained the group’s perspective:
“We believe in public investments in housing, infrastructure, and education, but also that Californians deserve more accountability and safeguards for their tax dollars.”
Why Supporters Say the Tax is Fair
The group behind the proposal, the Service Employees International Union-United Healthcare Workers West (SEIU-UHW), argues that the ultra-wealthy have seen their fortunes grow massively while public services struggle. They point out that the combined wealth of California’s billionaires has grown by 140% over the last three years, reaching a total of $2 trillion.
The revenue from the tax would be split, with 90% going toward healthcare and 10% toward education and food programs. Supporters believe this is a necessary “emergency tax” to protect vulnerable people, as federal funding for programs like Medicaid is expected to decrease.
Emmanuel Saez, a Berkeley economist who helped design the tax, defended the idea during a recent debate:
“The 2026 Billionaire Tax therefore asks billionaires to contribute something more like a fair share of their wealth to sustain the state in which they have built their fortunes.”
Legal and Economic Challenges Ahead
Even if voters approve the measure, it faces a difficult path. Experts believe it will be “litigated up to the Supreme Court.” Opponents claim the tax is unconstitutional because it tries to tax people retroactively and applies to wealth held in other states or countries.
Some economic studies suggest the plan could backfire. Research from the Hoover Institution at Stanford University claims that the loss of future income tax from departing billionaires could actually cost California $25 billion in the long run.
