Supporters of the “2026 California Billionaire Tax Act” filled San Francisco’s Moscone Center on Feb. 21, 2026, carrying signs and expecting a groundswell. They got Bernie Sanders. They got Robert Reich. What they didn’t get was the progressive infrastructure that was supposed to make this thing actually move.
That’s the story. Not the rally. The silence behind it.
The proposal’s mechanics aren’t complicated: a one-time 5% tax on any California resident sitting on more than $1 billion in net worth. According to Forbes, that’s about 200 people. The projected take is $100 billion, which backers want directed toward plugging holes left by federal cuts to the program that funds Medi-Cal and related services. Taxing Californians who are billionaires to pay for healthcare for people who aren’t. Simple pitch.
The reality’s messier.
As LAist reported, three union leaders and five members of the Legislative Progressive Caucus told reporters they have serious reservations about the measure. Only one would say it publicly. That’s not a fringe skepticism situation. That’s a pattern. When 21 progressive insiders won’t attach their names to a criticism, it means the political cost of honesty is higher than the cost of pretending.
The practical objections start with measurement. How do you calculate what a billionaire actually owes when most of their wealth isn’t liquid? Private equity positions, real estate holdings, art collections, they don’t come with a price tag you can audit in April. Assessing that accurately, then collecting it, is genuinely hard. Critics argue California doesn’t have the administrative capacity to do it cleanly, and a botched implementation would hand opponents a permanent argument against wealth taxes going forward.
Then there’s mobility. California’s income tax rate is already among the highest anywhere in the country. If a 5% wealth tax clears the ballot, some of those 200 people will leave. The income taxes and capital gains taxes they currently pay don’t go with them. Some economists think California is already closer to a revenue ceiling than the official projections show, and chasing out that much taxable wealth could leave the state worse off, not better.
But the sharpest complaint isn’t about enforcement or migration. It’s about who designed this measure and what they designed it to do.
SEIU-United Healthcare Workers West, the union that put the initiative together, represents workers in the healthcare sector. Critics inside the progressive movement say the money was structured specifically to benefit those members’ employers and working conditions, not to flow freely into the general fund where the legislature could direct it toward housing, childcare, education, or any other need. That’s a different thing than a broad progressive revenue grab. It’s a sector-specific funding mechanism wearing the clothes of a wealth tax.
“It’s not that taxing billionaires in itself is wrong,” said Keely Martin Bosler, a Democratic consultant who’s worked with major labor groups including the Service Employees International Union of California. “The way in which this tax specifically is constructed is problematic.”
Bosler spent years as California’s top budget officer under two governors. She’s not a centrist critic looking for reasons to protect the wealthy. When someone with her record says the construction is the problem, that’s worth taking seriously.
The Sanders-Reich endorsements gave the campaign its headline moment in San Francisco. They won’t be enough. “The Labor Federation won’t take it up for an endorsement until July,” according to a source familiar with the campaign’s timeline, which means the institutional muscle Democrats would need to pass something like this is still unresolved months into the 2026 cycle.
Behind the Moscone Center photo-op, Democrats who’d normally be lining up for a wealth tax measure are hanging back. That’s not opposition you can paper over with a rally. The bill’s backers have $100 billion in projected revenue as a selling point and a genuinely popular premise. What they don’t have yet is the left.