California’s wealthiest residents may soon face a financial earthquake. A citizen-led proposal, known as the “2026 Billionaire Tax Act,” aims to impose a one-time 5% tax on individuals worth over $1 billion. This includes full-time and part-time California residents, as well as certain trusts.
It is bold, controversial, and could raise up to $100 billion.
But don’t confuse it with law just yet. This idea is still in the proposal stage. To become real, it needs to pass a gauntlet of signature drives, legal checks, and voter approval by 2026. Even then, big-money lawyers and fierce political headwinds stand in the way.
What Is in the 2026 Billionaire Tax Act?
The plan is pretty straightforward. If you are a billionaire in California on December 31, 2026, you would owe 5% of your net worth. That includes everything, like stocks, businesses, art, real estate, and any other assets.
Giorgio / Unsplash / The goal of the 2026 Billionaire Tax Act is to plug a looming $30 billion annual hole in Medi-Cal, California’s version of Medicaid. The state expects federal cuts to leave millions vulnerable.
Supporters also want to send a slice of the revenue to K-12 schools. They say billionaires can easily afford it, and that the middle class shouldn’t have to carry the burden.
For the tax to even make it onto the November 2026 ballot, supporters have to collect at least 870,000 valid signatures by the spring of that year. Right now, they are just starting. The Attorney General’s office gave them the green light to begin gathering names.
Even if voters say yes, that is just the beginning. A tax of this magnitude and complexity would likely face court challenges from wealthy residents and business groups. And because it targets total wealth rather than just income, the legal path could become complicated. It might be years before California sees any money from it, if it happens at all.
Why This Is Blowing Up
Supporters are framing it as a fairness issue. Emmanuel Saez, a well-known economist at UC Berkeley, says the ultra-rich have made huge gains in recent years. A one-time tax, he argues, is just a drop in the ocean for them. Meanwhile, the money could keep basic health services alive for millions of low-income Californians.
They also argue that California's budget needs creative solutions. Raising taxes on the middle class or cutting public services would hit working families the hardest. A targeted tax on a small group of ultra-wealthy people is, in their eyes, the cleanest fix.
Mark / Unsplash / Opponents say this is a dangerous move. They argue it could drive billionaires out of California, and take a huge chunk of state revenue with them.
According to the Pacific Research Institute, those 200 billionaires already pay nearly a quarter of California’s income tax revenue. If even a few leave, the state could lose more than it gains.
They also warn that taxing net worth isn’t as easy as it sounds. Most billionaires don’t have that kind of cash lying around. Their wealth is tied up in assets, like businesses, shares, and real estate. Selling off those assets just to pay a tax could trigger big losses and cause economic ripple effects that hurt more than help.
Adding more drama, Governor Gavin Newsom has been cool on ideas like this in the past. He has avoided supporting wealth taxes and has voiced concern about the risks of pushing high-income residents away. His stance might not kill the bill, but it could slow momentum or turn key voters against it.
Newsom’s position matters, not just politically but practically. If the tax passes, it would still need his administration to help implement and enforce it. Without strong leadership, it could stall or fail in practice, even if voters approve it.