2026-11-05 · contested story
California billionaire wealth tax Prop 40 trailing after $300M opposition push
California's Proposition 40 — a one-time 5% wealth tax on the state's roughly 200-250 billionaires, designed to raise tens of billions (supporters claimed $100 billion) mostly to backfill federal Medicaid cuts — appeared headed for defeat on November 4, 2026, trailing 56% to 44% with around 60% of votes counted. The fight became one of the most expensive ballot campaigns in California history: billionaires led by Google co-founder Sergey Brin (over $100 million) poured more than $300 million into the group Building a Better California, which opposed Prop 40 and funded two 'poison pill' countermeasures (Props 41 and 42) that could nullify it. Supporters, led by the SEIU-United Healthcare Workers West union, raised roughly $32-34 million. Gov. Gavin Newsom and much of the Democratic establishment opposed it, while Sen. Bernie Sanders, Rep. Ro Khanna, and the state Democratic Party backed it.
How each side frames it
left
"If you spend enough on ads, you really can get people to vote against their own interests"
"California billionaires cry over possibility of paying their share"
"He'd rather working class kids die because they can't afford healthcare than pay his fair share in taxes"
"Proposition 40 would be the first-ever tax on billionaire wealth enacted anywhere in the world. California is the right place to take this historic step."
"Greed is on the California ballot, and it appears to be winning."
center
"If Proposition 40 fails, California will have to confront a bigger question: Where does the state's debate over taxing extreme wealth go from here?"
"On one side of this debate is economist Gabriel Zucman... On the other side of the debate is Stanford economist and Hoover Institution senior fellow Joshua Rauh."
"Some progressives think the governor — who is eyeing a possible 2028 presidential run — is just wary of angering a donor class with deep pockets."
"If you try to read Proposition 40, as I have, it's not easy to understand. I think ballot-box budgeting is difficult."
"What could $300 million get you? A boatload of television ads, millions of signatures, and a small army of consultants."
right
"I fled socialism with my family in 1979 and know the devastating, oppressive society it created in the Soviet Union. I don't want California to end up in the same place."
"We're taking the means of production out of the hands of people that built those businesses... and giving them to Bernie Sanders and AOC and politicians to run them. That's socialism."
"We calculate that Proposition 40 would cost the state of California $39 billion."
"its success could potentially see a rollout elsewhere"
"You can usually tell a controversial idea like the 'billionaire tax' is bad when proponents start trotting out teams of Nobel Prize winners to defend it... as if there were a Nobel Prize for groupthink."
What each side left out
The left left out — covered by the Reason & Business Insider & The Daily Economy
- The Jaros/Rauh Stanford-Hoover finding that 85% of simulations show a net revenue LOSS of ~$39B
- The administrative/valuation difficulty of taxing illiquid assets like art and private businesses
The left left out — covered by the TaxProf Blog
- That economists and accountants who study tax overwhelmingly oppose the measure (71% economists, 85% accountants in Hoopes survey)
The right left out — covered by the Common Dreams & Daily Kos & Democracy Now!
- That California attracted ~80% of national venture capital in 2026 after Prop 40 was announced, undercutting the capital-flight-kills-innovation claim
- That Nvidia's Jensen Huang and United's Scott Kirby publicly support paying the tax
The right left out — covered by the NPR & Boston Herald & Daily Kos
- That the Jan. 1, 2026 residency cutoff makes it legally difficult for billionaires to escape the one-time tax by moving
- That Zuckerberg struck a deal to STAY in California for eight years
The center left out — covered by the Common Dreams & Fox News
- The explicitly moral/oligarchy framing (billionaires 'buying democracy') that dominates left coverage
- The explicit 'socialism' framing that dominates right coverage
The left left out — covered by the New York Post & The American Prospect
- Serious treatment of sponsor Dave Regan's alleged misconduct (assault/intimidation allegations) as a credibility problem — mostly dismissed or defended
What's actually true?
[verified] Prop 40 was losing by roughly 56% to 44% with around 60% of votes counted on Nov. 4, 2026
[verified] Opponents (Building a Better California) raised/spent over $300 million, led by Sergey Brin at over $100 million, while supporters raised roughly $32-34 million
[verified] Prop 40 would impose a one-time 5% tax on net worth of California residents with over $1 billion in assets who lived in the state as of Jan. 1, 2026, affecting roughly 200-250 people
[verified] The California Legislative Analyst's Office estimated the tax would raise 'tens of billions of dollars' over several years (not the $100 billion backers claimed), with possible ongoing income-tax losses under $1 billion per year
[contested] Stanford economists Jaros and Rauh estimated the tax could generate only ~$28-36 billion and that in 85% of simulations the state would see a net loss, projecting an average net fiscal loss of ~$38.9 billion
[verified] Mark Zuckerberg considered moving but struck a deal with Meta's board to stay in California for eight years, with a new class of non-voting shares he could sell to pay the estimated ~$11-12.5 billion tax
[verified] Nvidia CEO Jensen Huang said paying the tax (estimated ~$8 billion over five years) would be a 'privilege'
[verified] Gov. Gavin Newsom opposed Prop 40 and endorsed Prop 42, arguing a wealth tax should be done at the national level, not state level, because wealth is mobile
The narrative clash
How much revenue the tax would actually raise
Left: SEIU-UHW says it would raise $103 billion in revenue; the Nobel laureates and Zucman/Saez estimate about $100 billion
Right: the proposed levy on wealth is projected to fall short of its backers' revenue projections — bringing in some $30 billion as opposed to the hoped-for $100 billion... the tax would end up costing California some $40 billion in lost revenue
Whether billionaires will actually flee the state
Left: in 2026, after Prop. 40 was announced, California has attracted 80% of the nation's venture capital funding, compared to just 50% prior to 2025
Right: the seven billionaires who have publicly said they are leaving the state represent more than $539 billion of the nearly $1.9 trillion aggregate net worth of California's billionaires
Whether the one-time tax will stay one-time
Left: Any change in the tax would require a two-thirds majority in the assembly and would need to stay true to the spirit of the tax... Prop 40 supporters say the claim... is just a scare tactic
Right: Critics warn the billionaire tax could eventually be expanded to hit ordinary Californians... Two-thirds of registered voters lacked confidence that the supposedly one-time tax would stay that way
Whether federal Medicaid funding was actually 'cut'
Left: Trump's cuts could cost Medi-Cal more than $30bn a year, and this tax would help fill that gigantic hole
Right: many of the so-called 'cuts' actually save the state money... even after the 'cuts,' a Hoover Institution analysis concluded that 'federal spending on Medi-Cal will be 50% higher in 2034 than in 2019.'
What the tax is — fair share or confiscation
Left: Billionaires are simply being asked to pay a share they can easily afford, and their resistance is self-interest, not principle.
Right: Taxing accumulated wealth is a step toward state seizure of private enterprise, not ordinary taxation.
101 sources analyzed
Common Dreams USA Today Palm Springs Desert Sun New York Post Fox News Daily Kos Capital & Main Macau Business New York Post Fox News HuffPost NPR NBC Bay Area New York Post City Journal Mother Jones Los Angeles Times Bloomberg Government News The Dispatch Newsmax Common Dreams The Mercury News Billionaires.Africa New York Post The New York Sun The Boston Globe Los Angeles Times Yahoo Reason City Journal Common Dreams Los Angeles Times Forbes Reason Newsmax The Daily Beast Business Insider The Daily Economy The Center Square Fox News Mother Jones The Guardian Truthout Boston Herald Fox News Common Dreams Al Jazeera TaxProf Blog Manhattan Institute Washington Examiner Vox USA Today Pacific Research Institute Cato Institute The New York Sun The American Prospect NPR Annenberg Media Boston Herald Newsmax The New Republic USA Today Democracy Now! Boston Herald Newsmax Mother Jones CNN KQED The Center Square National Review MSNBC The Washington Post Noozhawk Reason Magazine The New York Sun MSNBC NBC News Newsroom | UCLA Fox Business City Journal The Boston Globe CNN The San Francisco Standard Boston Herald Fox News Salon PBS NewsHour Morning Brew Reason National Review Mother Jones Politico CNBC Reason The Federalist The Daily Beast NBC News otherwords.org RealClearMarkets City Journal The Boston Globe