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California voters are being urged to put a poison-pill effort on the November ballot that would nullify a controversial proposed tax on the state’s billionaires.

Neither proposal has yet qualified for the ballot — supporters of each need to gather the verified signatures of hundreds of thousands of voters. But petitions that have been mailed and texted to California voters in recent days demonstrate the stakes in a contest that has drawn tens of millions of dollars in campaign spending.

“Government has wasted billions of our tax dollars on homelessness and many other failed programs with little to show for it,” reads the new mailing to voters. “We can’t afford more wasteful spending!”

The proposal is aimed at countering a proposed one-time 5% tax on billionaires assets that would fund healthcare for the state’s neediest residents, but opponents say it would lead to lost tax revenues as California’s wealthiest flee the state.

Mailers and texts recently sent to voters describe the new proposal as an effort to create a more accountable, transparent and effective state government that would require auditing of new state taxes and ensuring they comply with existing law.

The small-font description of the proposed initiative included in the mailing specifies that any new tax enacted after Jan. 1 must be deposited into the state’s general fund and conform with current state tax policy, which is an oblique reference to a prior voter-approved ballot measure requiring that a significant portion of the state’s tax revenue be spent on education.

If competing proposals appear on a ballot and are successful, the one that receives the most votes nullifies the other. There are other ballot measure proposals aimed at thwarting the billionaires tax.

The mailers and texts were funded by a committee called Californians for a More Transparent and Effective Government, which was funded by another group, called Building a Better California, according to the California secretary of state’s office.

Earlier this year, the latter group received a $20-million donation from Google co-founder Sergey Brin, $2 million from former Google Chief Executive Eric Schmidt and $2 million from Stripe CEO Patrick Collison, among donations from other Silicon Valley leaders, according to fundraising disclosure reports.

Attempts to reach spokespeople connected with the effort were unsuccessful Monday night.

Suzanne Jimenez, chief of staff at SEIU-United Healthcare Workers West, the primary union backing the billionaire tax, decried what she described as an effort by a small number of the state’s wealthiest residents to avoid paying their fair share.

“So far, those few billionaires are failing,” she said in a statement. “Despite the expensive and wasteful tactics by a small group of billionaires that aim to deny voters a choice on the billionaire tax in November, our growing coalition and volunteer base is on track with signature collection and gaining momentum. The public is crystal clear on the fact that keeping ERs and clinics open is more important than billionaires getting more tax breaks.”

California’s budget is notoriously volatile because it is largely dependent on taxes paid by its wealthiest residents. Revenue hinges on capital gains from investments, bonuses to executives and windfalls from new stock offerings, all of which are grossly unpredictable.

The billionaire tax would cost more than 200 of the state’s richest residents about $100 billion if a majority of voters support it on the November ballot.

The proposed tax would retroactively apply to billionaires’ assets as of Jan. 1, and has already prompted some of California’s wealthiest residents to leave the state. It has also created a wedge among Democrats. Some argue that it is necessary to address tax inequities that benefit the rich and harm everyone else. Among the supporters is Sen. Bernie Sanders (I-Vt.), who kicked off the billionaire tax proposal drive in February.

But others, notably Gov. Gavin Newsom, oppose the effort, saying policies that vary by state would drive innovators and businesses outside of California.

WASHINGTON — As progressives seek to place a new tax on billionaires on California’s November ballot, a Republican congressman is moving in the opposite direction — proposing federal legislation that would block states from taxing the assets of former residents.

Rep. Kevin Kiley (R-Rocklin), who faces a tough re-election challenge under California’s redrawn congressional maps, says he will introduce the “Keep Jobs in California Act of 2026” on Friday. The measure would prohibit any state from levying taxes retroactively on individuals who no longer live there.

The proposed legislation adds another layer to what has already been a fiery debate over California’s approach to taxing the ultra-wealthy. It has created divisions among Democrats and has placed Los Angeles at the center of a broader political fight, with Bernie Sanders set to hold a rally on Wednesday night in support of the wealth tax.

Kiley said he drafted the bill in reaction to reports that several of California’s most prominent billionaires — including Meta Chief Executive Mark Zuckerberg and Google co-founders Larry Page and Sergey Brin — are planning to leave the state in anticipation of the wealth tax being enacted.

“California’s proposed wealth tax is an unprecedented attempt to chase down people who have already left as a result of the state’s poor policies,” Kiley said in a statement Wednesday. “Many of our state’s leading job creators are leaving preemptively.”

Kiley said it would be “fundamentally unfair” to retroactively impose taxes on former residents.

“California already has the highest income tax of any state in the country, the highest gas tax, the highest overall tax burden,” Kiley said in a House floor speech earlier this month. “But a wealth tax is something unique because a wealth tax is not merely the taxation of earned income, it is the confiscation of assets.”

The fate of Kiley’s proposal is just as uncertain as his future in Congress. His 5th Congressional District, which hugs the Nevada border, has been sliced up into six districts under California’s voter-approved Proposition 50, and he has not yet picked one to run in for re-election.

The Billionaire Tax Act, which backers are pushing to get on the November ballot, would charge California’s 200-plus billionaires a onetime 5% tax on their net worth in order to backfill billions of dollars in Republican-led cuts to federal healthcare funding for middle-class and low-income residents. It is being proposed by the Service Employees International Union-United Healthcare Workers West.

In his floor speech, Kiley worried that the tax, if approved, could cause the state’s economy to collapse.

“What’s especially threatening about this is that our state’s tax structure is essentially a house of cards,” Kiley said. “You have a system that is incredibly volatile, where top 1% of earners account for 50% of the tax revenue.”

But supporters of the wealth tax argue the measure is one of the few ways that can help the state seek new revenue as it faces economic uncertainty.

Sanders, an independent from Vermont who caucuses with the Democrats, is urging Californians to back the measure, which he says would “provide the necessary funding to prevent more than 3 million working-class Californians from losing the healthcare they currently have — and would help prevent the closures of California hospitals and emergency rooms.”

“It should be common sense that the billionaires pay just slightly more so that entire communities can preserve access to life-saving medical care,” Sanders said in a statement earlier this month. “Our country needs access to hospitals and emergency rooms, not more tax breaks for billionaires.”

Other Democrats are not so sure.

Gov. Gavin Newsom, who is eyeing a presidential bid in 2028, has opposed the measure. He has warned a state-by-state approach to taxing the wealthy could stifle innovation and entrepreneurship.

Some of he wealthiest people in the world are also taking steps to defeat the measure.

Brin is donating $20 million to a California political drive to prevent the wealth tax from becoming law, according to a disclosure reviewed by the New York Times. Peter Thiel, the co-founder of PayPal and the chairman of Palantir, has also donated millions to a committee working to defeat the proposed measure, the New York Times reported.