Investing legend Warren Buffett used his first sit-down interview since retiring as Berkshire Hathaway CEO to deliver a sweeping indictment of prediction markets, legalized sports betting, and day trading, calling them all variations of a single phenomenon: a 'tax on stupidity' that quietly shifts the tax burden onto lower-income households while subsidizing the wealthy. The interview, conducted by CNBC's Becky Quick on March 31, marks Buffett's most extensive public commentary since handing the CEO reins to Greg Abel at the start of the year.
The Interview: No Distinctions Drawn
When Quick asked Buffett whether he disapproved of 'prediction markets, of legalized sports gambling, even of day trading,' the 95-year-old investor did not separate the categories. 'To the extent that the states raise money from people who [think] the dollar really means something to them, actually relieves the taxes on me or other rich people,' Buffett replied. 'I mean, it's not direct, but it's the net effect.' Pressed by Quick to agree with the old line that a lottery is a tax on the stupid, Buffett confirmed: 'It's a tax on stupidity.'
This position is consistent with his past remarks. At Berkshire's 2007 annual meeting, he called gambling in general 'a tax on ignorance' and described state-sponsored betting as 'socially revolting.' What is new is the explicit inclusion of prediction markets alongside legal sports betting and retail day trading. For the past 18 months, platforms like Kalshi and Polymarket have actively argued that event contracts are federally regulated derivatives, not gambling. Buffett accepted the framing without modification, effectively rejecting the industry's core premise.
Mainstream Media Missed the Prediction-Markets Angle
Initial coverage of the interview on March 31 focused on Buffett's investment outlook, his comments on Apple, and his retirement narrative. The sports-betting angle did not gain traction until April 27, when The Growth Podcast host Aakash Gupta extracted the gambling clip and highlighted Buffett's math: nine U.S. states have no state income tax, seven of those nine run state lotteries, and seven of those nine have legalized sports betting. Front Office Sports picked up the story the same day, with Yahoo Sports syndicating it. Yet none of the major trade press — including CNBC's own follow-up coverage — has flagged the fact that Buffett explicitly grouped prediction markets with sports betting. The omission is particularly notable given that CNBC disclosed a commercial relationship and minority investment in Kalshi in its April 14 prediction-markets coverage but not in the Buffett interview transcript.
The Regulatory Crossroads
Buffett's rebuke comes at a critical moment for prediction markets. Bernstein projects that prediction market volume will hit $240 billion in 2026, up from a fraction of that in prior years. The industry is pressing for federal recognition as derivatives under the Commodity Futures Trading Commission (CFTC), a position that enjoyed favor under the Trump administration. However, state regulators in Arizona, New Jersey, Romania, and elsewhere continue to argue that these platforms operate unlicensed gambling under different branding. Buffett's interview gives rhetorical ammunition to those who see event contracts as no different from sports wagers.
Adam Hoffer, director of excise tax policy at the Tax Foundation, told Front Office Sports that he understood Buffett's position. 'Gambling, in general, is a losing proposition,' Hoffer said. 'The house always wins. Piling on taxes only makes the return on investment even worse for gamblers.' He added that wealthier Americans spend a smaller share of their income on gambling than lower-income households — a pattern, he said, 'governments know.' The numbers support the concern: U.S. sports-betting revenue alone hit $16.96 billion in 2025, up nearly 23% year-over-year, and state-regulated sportsbooks generated $3.71 billion in taxes, up 32.4% from 2024. Forty states plus Washington, D.C., now offer legal online sports betting.
Industry Pushback and New ETF Filings
Prediction-market advocates maintain that the regulatory framework around event contracts is fundamentally different — federally regulated derivatives rather than state-licensed gambling. Buffett's interview does not engage with that argument. Yet the stakes are rising. CNBC reported last week that new ETF filings would allow retail investors to buy event-contract exposure inside retirement accounts, a move that would push the products further into the mainstream financial system. Meanwhile, Kalshi faces potential legal action regarding its Iran regime change market resolution, with CEO Tarek Mansour insisting the platform does not list markets tied to the death of any individual.
Whether Buffett's 'tax on stupidity' framing breaks through the industry's carefully constructed narrative depends on what regulators and courts do next. The state-versus-CFTC fight continues, and Buffett — now retired but still the most quoted living investor in American business — has placed prediction markets squarely on the wrong side of his sucker-game test. The industry's challenge is to prove that event contracts are something more than a tax on the poor.