The architect of California’s wealth tax proposal called out The Washington Post and its multibillionaire owner, Amazon founder Jeff Bezos, on Thursday for peddling what he said is “misinformation” to readers.Emmanuel Saez, a French economist and professor at the University of California, Berkeley, who was tapped by California’s largest union to design the tax proposal, singled out an opinion piece by the Washington Post editorial board from earlier this week that argues the proposal would backfire and cost California billions of dollars in tax revenue each year.Saez said the article contains glaring falsehoods and omits key information about the proposal, which aims to create a one-time tax of 5% on the total assets of California’s roughly 200 billionaire residents in order to recoup about $100 billion in revenue for healthcare, food assistance, and education stripped from the state by last year’s Republican federal budget legislation, which will hand $1 trillion in tax breaks to the wealthiest 1% of Americans over the next 10 years.The piece, published on Monday with the headline “California already losing with billionaire tax referendum,” argues that even if California voters don’t ultimately approve the measure, “the specter of such a wealth tax has already cost the state more in lost future revenue from income taxes than it would raise” due to an exodus of wealthy people from the state—an oft-used but weakly substantiated talking point by opponents of the measure.The Post cited a paper by Jared Walczak, a visiting fellow at the California Tax Foundation, which it said demonstrates that billionaire flight “will cost California’s state government somewhere between $3.5 billion and $4.5 billion every year in other tax collections, and up to $19 billion in lost [gross domestic product].”But Saez argued that his study makes a “basic mistake” by “modeling a mobility response of billionaires to a permanent annual and recurrent 5% wealth tax.” In reality, though, the tax would be imposed only once and would apply to any billionaires who resided in the state after January 1, 2026, which has already passed, so it no longer creates an incentive to move.Saez argued that in any case, “Walczak’s estimation of the California income tax paid by billionaires who have threatened to leave is also wildly exaggerated.”Walczak’s figure for lost tax revenue, he said, hinges on the idea that the three richest men who’ve threatened to leave the state, Google co-founders Sergey Brin and Larry Page, and Meta CEO Mark Zuckerberg, pay $1.7 billion in California income taxes each year.“If only they paid so much!” Saez quipped.“In reality, using Securities and Exchange Commission data on stock sales, stock donations, dividends, and executive compensation, we can directly estimate that they paid only [$269 million] in California income tax in 2025, 6.3 times less than Walczak’s assumption,” he said, citing a paper he co-wrote in March responding to a similar argument by a conservative think tank.He cited tax data showing that the tech tycoons—who own a combined $810 billion according to Forbes—only collectively paid about [$22 million] per year on average between 2019-25, with Brin and Page paying no taxes on their wealth from stock in Google’s parent company Alphabet during three of those years because they didn’t sell stock, get dividends, or receive executive compensation. This is despite 90% of their wealth coming from those holdings.“The one-time wealth tax finally makes them contribute in proportion to their enormous wealth gains,” Saez said.The Post also claimed that the Service Employees International Union (SEIU) United Healthcare Workers West, the union leading the charge in support of the referendum, is “pretend[ing] that the tax is needed to save California’s health system from ‘collapse’” and is instead dishonestly using that framing to covertly pursue the “redistribution of wealth.”But Saez said that the federal cuts of roughly $20 billion annually are already having devastating effects on Californians that could be alleviated with more tax revenue.As a result of the cuts, “more than 400 California hospitals have already laid off more than 3,400 healthcare workers as of mid-March, with a second wave of layoffs expected as funding cuts tied to recent federal policy changes are phased in over the next several years,” he said. “Statewide, projections show the cuts could result in the loss of up to 145,000 healthcare jobs, impacting hospitals, clinics, and home care providers alike.”Eighty-three more hospitals in California may be at risk of closing due to the federal funding cuts, according to a recent nationwide analysis by Public Citizen.