The proposal, backed by the Service Employees International Union Healthcare Workers West, would impose a one-time, 5% tax on individuals whose net worth exceeds $1 billion and who were living in the state as of Jan. 1, 2026. The goal is to generate $100 billion in revenue, which would largely be used to offset federal funding cuts to healthcare for low-income people.

“California’s health is at stake,” said Liz Perlman, executive director of a chapter of the American Federation of State, County and Municipal Employees, a major labor union. “Hospitals are closing and people will die. Why? So billionaires can get another tax cut that they don’t need.”

The California Secretary of State still has to verify the signatures and officially place the measure on the ballot. Backers say they collected more than 1.5 million signatures, well over the roughly 875,000 they needed. California allows ballot initiative campaigns to pay people per signature they gather. The cost of gathering petition signatures can vary widely, but it typically runs around $15 for each signature.

If the measure goes before voters in November, it could prompt one of the costliest ballot fights ever and will draw national attention as a litmus test for voter attitudes on raising taxes on the rich. An effort to oppose the tax has already raised millions and led to proposals designed to nullify the tax. Meanwhile, Vermont Sen. Bernie Sanders has campaigned in support of the idea.

Democratic Gov. Gavin Newsom and Silicon Valley tech moguls are adamantly opposed. They warn it will drive California’s wealthiest residents out of the state. Nearly half of California’s personal income tax revenue comes from the top 1% of earners. Some have already purchased properties out of state in case it passes.

“After playing with matches since October the SEIU has succeeded in lighting a ‘Tax the Rich’ wildfire by getting enough signatures,” said David Lesperance, a tax consultant who’s advised some of his wealthy clients who left California because of the proposal. “The many billionaire targets of their efforts have already responded by executing fire escape plans by relocating to other states.”

Brian Brokaw, a longtime Newsom adviser who is leading a political committee opposing the tax, said the measure was poorly constructed and would deal a huge blow to the state’s budget.

“Enacting a so-called wealth tax in just one state wouldn’t target a small group — it would impact all 40 million Californians,” he said in a statement. “This proposal trades a short-term revenue bump for long-term losses.”

At least 25 billionaires listed among Forbes magazine’s 2025 rankings of the world’s 500 wealthiest people either lived in California or had some significant ties to the state, based on a review by The Associated Press. But determining whether they were full-time residents or just frequent visitors could turn into a matter of dispute, since many of them own property elsewhere.

The big tax and spending cuts law President Donald Trump signed last year will cut more than $1 trillion nationwide over a decade from Medicaid and federal food assistance.

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Taxing the rich to backfill Trump-induced federal funding cuts might sound like a no-brainer policy for the party’s left flank, which counts wealth inequality among its top issues. 

But despite a strong show of support from prominent national figures, including Sen. Bernie Sanders of Vermont and liberal economist Robert Reich, the “2026 California Billionaire Tax Act” has become a hot potato for labor leaders.

The proposed initiative would levy a one-time tax of 5% on any resident of California whose net worth exceeds $1 billion, which applies to around 200 people, according to Forbes. That money would plug an estimated $100 billion hole left by federal cuts to Medi-Cal and other social service programs.

Publicly, prominent labor and progressive players have largely kept quiet, unlike Gov. Gavin Newsom who has aired his disdain loud and clear. Yet in private, some union leaders and their allies in the Legislature rail against the measure. Of the critics who spoke with CalMatters for this story — three union leaders and five members of the Legislative Progressive Caucus — only one lawmaker would criticize the measure openly. 

Critics question its feasibility and whether the state even knows how to accurately appraise a billionaire’s total wealth, a crucial step to evaluating how much tax they would owe. They fear long-term revenue loss by driving wealthy people out of California. And some resent that the union sponsoring the initiative, SEIU-United Healthcare Workers West, designed the measure to predominantly benefit its members rather than boost the state’s general fund, where it could go to all budget needs. 

“It’s not that taxing billionaires in itself is wrong,” said Keely Martin Bosler, formerly the top state budget officer to Newsom and former Gov. Jerry Brown. She is now a Democratic consultant who has advised several of California’s most powerful labor groups, including the Service Employees International Union of California, the parent union of SEIU-UHW. “The way in which this tax specifically is constructed is problematic.”

Many progressive state lawmakers and Capitol heavyweights, such as Sen. Scott Wiener of San Francisco and the powerful California Labor Federation, have sidestepped the question of whether they’d support it, declining for now to take a position on an initiative that has yet to officially qualify for the ballot. 

“The Labor Federation won’t take it up for an endorsement until July,” said Lorena Gonzalez, the organization’s president, in a text message.

Yet if the tax lands on the November ballot, as it appears on track to do, progressive critics will be saddled with the tricky optics of opposing — or at least not supporting — a measure that embodies one of their base’s core tenets: taxing the rich.

Even the mere threat the measure could qualify for the ballot has already spurred a torrent of opposition spending — more than $50 million in total so far — from billionaires such as Google co-founder Sergey Brin and cryptocurrency mogul Chris Larsen. Brin’s group, known as “Building a Better California,” has also spawned three new competing ballot measures designed to undermine the billionaires’ tax. 

Critics fear that if billionaires like Brin become even bigger perennial spenders in California politics, they could neuter the progressive agenda by bankrolling more business-friendly candidates and ousting left-leaning, labor-aligned legislators. 

But the measure’s proponents say they are undeterred by the secretive detractors and challenge their critics to put their names behind their words.

“What we have is a group of so-called leaders who are not reflecting the attitudes of their own constituents,” said Dave Regan, president of SEIU-UHW and the de facto leader of the billionaire tax measure. “That’s why they want to be anonymous.”

Regan said he’s confident the initiative will amass enough signatures to qualify for the ballot before the end of April. Then, he said, “We believe a lot of those people are going to come around and change because this makes sense, because the public is supportive, because their own members are supportive.”

The case for, and against, the billionaires’ tax

So far, polling has shown the billionaire tax is relatively popular with voters. Recent surveys show just over half of Californians surveyed said they’re inclined to vote for it. 

Critics point out that California’s existing state tax structure is entirely based on income, rather than net worth. The state would have to appraise each person’s assets, including real estate, art, automobiles and private and public businesses. The billionaires could pay in installments, handing over 1% of their wealth annually for five years.

Bosler said that with income tax filings, the Franchise Tax Board can use data from federal tax returns to verify its own analysis. Since there’s no federal wealth tax, California would be forging uncharted territory with no tax compliance support from any other source or agency — a risky move that could invite legal challenges. 

“The state is not a miracle worker, like, they’re not going to suddenly be able to do all of this like perfectly,” said Bosler. “I mean they will do their best, but I just think this is expertise that they have built up over 50-plus years. Like, none of this is in their wheelhouse at this point.”

But champions of the tax argue it is the only real solution on the table so far to save hospitals, health care jobs and, ultimately, patient lives they say are at risk due to federal funding cuts to Medi-Cal and food assistance programs. 

Supporters note that the tax is not intended to solve California’s structural budget problems. 

“It’s one-time funding to fill what we hope is a one-time hole,” said Brian Galle, a tax law professor at UC Berkeley who helped craft the measure. Galle said only around 200 people would be subjected to the tax, so the extra burden on the Franchise Tax Board wouldn’t be too great. 

“It’s not like FTB is going to get a blizzard of tens of thousands of new returns that they’re going to have to figure out a whole new data system for cracking,” said Galle.

Why some progressives aren’t on board

Those who have qualms with the initiative have largely kept their criticisms private. 

One liberal state legislator, who spoke on the condition of anonymity, said the infighting among the unions puts progressive lawmakers in a difficult position. While he empathizes with the urgency that health care workers feel, he and other Democrats are not convinced the policy could withstand legal challenges and worry about the wealthy employing savvy accounting maneuvers to skirt the tax altogether.

Some organizations that are synonymous with progressive politics in California, such as the Working Families Party, also haven’t taken a position, even as other unions such as the Teamsters and AFSCME California support it. 

Even the powerhouse labor union SEIU California is choosing not to take a position on the measure, which is spearheaded by one of its local affiliates, SEIU-United Healthcare Workers West. 

Assemblymember Chris Ward, a member of the progressive caucus, called the measure a “well-meaning effort by UHW,” but criticized the proposal for being just a one-time tax primarily benefiting the health care sector rather than boosting the state’s overall revenues. Regan said SEIU-UHW made the tax one-time to nullify the argument that it would push billionaires out of the state.

Ward noted that he and his colleagues are considering “superior” bills, such as one that would close a corporate tax loop to generate $3 billion per year, and another that would create a new tax on corporations that pay workers so little that they qualify for Medi-Cal and nutrition assistance.

Regan argued these measures would only make California more unaffordable, since businesses would pass their increased costs along to consumers. 

Ward, the sole state lawmaker who would candidly share his concerns about the initiative with CalMatters, said he and his colleagues have heard pushback from “a number of other labor organizations that don’t support that initiative,” primarily because its members would not directly benefit from any of the revenue. Uniting labor, he said, is the key to any successful revenue solution.

“There’s a need to look at a wealth tax for a more broad range, including health care workers but other purposes that are state priorities,” Ward said, “and that will be left off of the table if this is the only question we’re seeing.”

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