Lining up alongside them is a coalition of prominent Democratic voices and party allies like Gov. Gavin Newsom<\/a>, Planned Parenthood and the California Teachers Association, as well as most Republicans. They say it will drive wealthy people \u2014 and their tax money \u2014 out of California, creating bigger budget problems in the years ahead.<\/p>\n They have raised more than $300 million in opposition to the measure, with nearly a third of that coming solely from Google co-founder Sergey Brin. That is roughly 10 times the amount raised by the \u201cyes\u201d side, which includes some labor unions, California Rep. Ro Khanna and Vermont Sen. Bernie Sanders. With much less money to spend, the \u201cyes\u201d campaign is relying heavily on Sanders and the attention he commands among progressives to make their case ahead of the Nov. 3 deadline to vote.<\/p>\n \u201cAre we destined to live in an oligarchic society begging for crumbs while our economic and political lives are controlled by a handful of the wealthiest people on Earth?\u201d Sanders declared at one of three recent California rallies. \u201cBrothers and sisters, that is the question on the ballot.\u201d<\/p>\n The measure, known as Proposition 40<\/a>, is not a long-term wealth tax like the one Sanders and some other progressives have long championed. It would impose a one-time, 5% tax on the wealth of Californians whose net worth exceeds $1 billion, with most of the revenue dedicated to replacing federal funding cuts to healthcare. It would be the nation\u2019s first tax on the wealth of billionaires \u2014 targeting the main way the ultra-wealthy make their money, through their investments, rather than simply raising taxes on the paycheck they receive from work.<\/p>\n Voters were largely split on the measure in a September poll by the Public Policy Institute of California. About half, 52%, of likely voters said they would vote yes on the measure, while 46% said they would vote no.<\/p>\n With mail ballots being sent to voters, opponents are aggressively ramping up their campaign, spending or booking roughly $96 million of airtime and digital messaging, compared with just $209,000 by supporters, according to data compiled by the ad-tracker AdImpact.<\/p>\n Rapper Common performs during a campaign rally in support of California Proposition 40, known as the billionaire tax, in Los Angeles, Monday, Oct. 5, 2026. (AP Photo\/Jae C. Hong)\n<\/p>\n Nvidia CEO Jensen Huang, from left, Google co-Founder Sergey Brin, Microsoft CEO Satya Nadella and Lisa Su, CEO of Advanced Micro Devices, listen to Donald Trump speak at the U.S. Institute of Peace, Thursday, Oct. 8, 2026, in Washington. (AP Photo\/Julia Demaree Nikhinson)\n<\/p>\n California Gov. Gavin Newsom pauses while discussing environmental issues in San Francisco, Tuesday, Sept. 29, 2026. (AP Photo\/Rich Pedroncelli)\n<\/p>\n Show Caption<\/p>\n 1 of 3<\/p>\n Rapper Common performs during a campaign rally in support of California Proposition 40, known as the billionaire tax, in Los Angeles, Monday, Oct. 5, 2026. (AP Photo\/Jae C. Hong)\n<\/p>\n Expand<\/a> A few hundred billionaires live in California, according to the nonpartisan Legislative Analyst\u2019s Office.<\/p>\n Opponents are concerned the proposal is already driving wealthy people away. That could deal a blow to California\u2019s budget because the state relies on its top 1% of earners<\/a> for nearly half its personal income tax revenue.<\/p>\n \u201cWe\u2019re not opposed to the concept of a wealth tax,\u201d said Jodi Hicks, CEO of Planned Parenthood\u2019s California chapter. \u201cWe just believe this proposal is seriously flawed and could do more damage than good.\u201d<\/p>\n Some Silicon Valley tech moguls began cutting ties with the state in anticipation of the tax, including Brin and his fellow Google co-founder, Larry Page. The tax would apply to billionaires living in the state as of Jan. 1, 2026.<\/p>\n Newsom has walked a fine line on the issue as he prepares to leave office and considers a bid for president in 2028. He has largely opposed tax increases during his eight years as governor. But he has called for a national tax on billionaires<\/a>, arguing a single-state proposal will not be effective and could hurt California\u2019s bottom line.<\/p>\n His opposition to the California proposal wasn\u2019t enough to dissuade the state Democratic Party\u2019s executive board from endorsing the measure earlier this year.<\/p>\n Billionaires including Brin, venture capitalist John Doerr and former Google CEO Eric Schmidt have given millions to a political committee called Building a Better California. The committee is fighting the tax and backing other ballot measures that would nullify it, including a proposal to ban new taxes on financial assets and other personal property, excluding real estate.<\/p>\n In one ad funded in part by Building a Better California, doctors wearing white coats warn it will cost California revenue in the long run and force the state to cut funding to hospitals and clinics.<\/p>\n Under the measure, 90% of the money would go toward funding healthcare, and the rest would go toward education and food assistance programs.<\/p>\n Debra Schade, president of the California School Boards Association, said there is no guarantee public schools will substantially benefit from the tax.<\/p>\n \u201cThe devil is in the details,\u201d she said.<\/p>\n Cristobal Young, a sociology professor at Cornell University, said previous California tax increases on millionaires didn\u2019t lead to a mass exodus of wealthy people.<\/p>\n \u201cThese really high-income folks \u2014 they\u2019re already doing great, and they don\u2019t need to move somewhere else,\u201d he said.<\/p>\n But the latest proposal is poorly designed, he said. The state, and the country, should instead pass tax code reforms to prevent wealthy people from shielding their financial assets from taxation, he said.<\/p>\n Supporters say it\u2019s the only way to stave off a healthcare crisis<\/p>\n The SEIU United Healthcare Workers West, the union behind the ballot measure, says it is necessary to replace an estimated $100 billion that will be lost in federal healthcare funding over five years. The union forged ahead<\/a> earlier this year despite pleas from fellow Democrats to drop the measure.<\/p>\n The campaign has raised $32.4 million, and another group backing the billionaire tax, Tax the Ultra-Rich Now, has received about $369,000.<\/p>\n One ad the campaign plans to release digitally and on cable next week warns that children make about 1.5 million emergency room visits a year in California, and the federal funding cuts could threaten the hospitals that serve them.<\/p>\n They have also released ads urging voters to \u201cjoin Bernie Sanders, tax the billionaires, stop California\u2019s healthcare collapse\u201d and showing a Planned Parenthood employee object to Hicks\u2019 opposition to the measure.<\/p>\n![\"Rapper](\"https:\/\/www.mercurynews.com\/wp-content\/uploads\/2026\/10\/Election_2_26_California_Billionaires_Tax_14781.jpg?w=620\")
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\nSome critics say the measure will have unintended consequences<\/p>\n