A sweeping proposal to impose a one-time tax on California’s billionaires is now officially headed for the November ballot after organizers say they have cleared the signature threshold by a wide margin. The measure has ignited a high-stakes political and economic battle, pulling in tech billionaires, labor unions, and Governor Gavin Newsom as tensions escalate over wealth, inequality, and the future of state funding.

The initiative, which targets some of the richest individuals in the country, arrives amid a surge of political spending, legal maneuvering, and growing fears of capital flight from California’s wealthiest residents.

Ballot Qualification Confirmed After Massive Signature Drive

Backers of the proposal say they have collected more than 1.5 million signatures, far exceeding the 870,000 required to qualify for the ballot.

The campaign is sponsored by the Service Employees International Union-United Healthcare Workers West labor union. The group formally announced on Monday that it would submit signatures for verification, setting the stage for one of the most closely watched ballot fights in the state.

Supporters framed the initiative as a response to widening inequality and federal cuts to health services.

At a press conference, healthcare workers stood alongside union organizers holding signs reading “keep hospitals and ERs open” as they urged voters to support the measure.

“Ultra-wealthy billionaires have seen their fortunes skyrocket, even as food, rent, gas prices increase,” said Mayra Castañeda, a healthcare worker who campaigned for the proposal. “We say that those who have prospered from here in California can afford to invest a little more in keeping California running.”

A One-Time Wealth Shock Targeting Billionaire Assets

The proposal would impose a one-time 5% tax on the assets of California billionaires, including stocks, art, businesses, collectibles, and intellectual property.

The revenue would be used to offset federal funding cuts to healthcare services for lower-income residents that were signed by Donald Trump last year.

The tax would apply retroactively to billionaires residing in California as of January 1, intensifying its scope and potential financial impact.

Advocates argue the measure is designed to stabilize strained public health systems and reduce inequality during a period of rising living costs.

“Being taxed like every other resident will not hurt the billionaires,” Liz Perlman, a California labor leader, said at the press conference. “It will not reduce the number of yachts they get to waterski behind, but it will help our hospitals and the workers who have been unfairly punished by Trump’s cruelty.”

Tech Titans Mobilize Against Billionaire Tax

Opposition to the measure has triggered one of the most expensive political counteroffensives in recent California ballot history, fueled by Silicon Valley’s wealthiest figures.

Executives and former executives tied to Google, DoorDash, Reddit, LinkedIn, and Facebook have poured money into efforts to defeat the proposal.

Alphabet president Sergey Brin has donated at least $45 million to the Super Pac Building a Better California, which is dedicated to blocking the tax. Former Alphabet CEO Eric Schmidt has contributed more than $3 million.

Larry Page, who co-founded Google with Brin, recently spent about $173 million on two Miami mansions and has moved several limited liability companies out of California.

Meta CEO Mark Zuckerberg also purchased a $170 million property in Miami earlier this year, moves that critics say reflect growing concerns among the ultra-wealthy about California’s tax climate.

Newsom and Progressive Allies Split Over Wealth Tax Fight

The proposal has opened a deep political divide between Governor Gavin Newsom and influential members of the Democratic Party’s progressive wing, including Bernie Sanders, who has endorsed the measure and promoted it as a potential model for other states.

Newsom has long opposed state-level wealth taxes, arguing they could weaken the world’s fourth-largest economy. The governor, who is widely seen as a potential 2028 presidential contender, has said he is actively working to block the initiative.

He has stated he would “do what I have to do to protect the state”.

Analysts warn that even the possibility of passage could accelerate capital relocation and reduce tax revenues.

“It’s one of the reasons why Newsom’s path to the Democratic nomination is not going to be an easy one,” said Jack Pitney, a political scientist at Claremont McKenna College. “He’s already facing a [budget] deficit the size of which is uncertain … and in the years to come, a billionaires tax that could backfire badly.”

Economic Stakes and Fear of Wealth Exodus

California currently has more billionaires than any other state, estimated at several hundred. Nearly half of the state’s personal income tax revenue, which supports its nearly $350 billion budget, comes from the top 1% of earners.

Economists and political strategists say even a small exodus of high-net-worth individuals could translate into hundreds of millions in lost tax revenue, adding pressure to an already complex fiscal outlook.

Supporters of the tax reject those concerns.

The Service Employees International Union argues that warnings of an exodus are exaggerated and politically motivated.

Suzanne Jimenez, chief of staff of SEIU-United Healthcare Workers West, called the proposal a “workable response to a crisis created by Congress”. She said it would “keep emergency rooms open, hospitals staffed and health care systems functioning”.

Business Opposition Intensifies as Campaign Fight Escalates

Opposition is being led by the California Business Roundtable, which has received major funding from billionaire donors including Larry Page and Palantir co-founder Peter Thiel.

The group argues the tax would harm economic stability and raise costs across the state.

It claims the measure would “undermine our economy, decimate the state budget, drive investment out of the state and ultimately make everyday life more expensive for working families”.

With signature thresholds cleared and both sides now fully mobilized, California is heading toward a political showdown that could redefine the state’s approach to wealth taxation, billionaire influence, and public funding for years to come.