Missouri attorney general says prediction markets owe sports betting taxes

Andrew Bailey did not file a lawsuit. He did not issue a cease-and-desist. What the Missouri Attorney General did, according to reporting by Sports Betting Dime, was say out loud what several state officials have been thinking quietly for months: that prediction markets operating in states with sports betting tax frameworks should probably be paying into them.

That word — probably — is doing real work here. It is not a legal opinion. It is not a regulatory action. It is a public positioning move by an elected official in a state that legalized sports betting and now watches platforms like Kalshi generate volume on NFL games without contributing to the tax base that Missouri's licensed operators fund. Bailey is putting a marker down before someone else puts one down for him.

The argument has surface logic. If a contract resolves on whether a quarterback's first pass is complete, and a sports betting license covers exactly that kind of wager, the question of why one product pays tax and the other does not is not a complicated question to ask. It is a complicated question to answer, and that distinction matters enormously for how this plays out.

Kalshi's position — consistent across its litigation in Michigan, New Jersey, and now before the Supreme Court — is that its contracts are federally regulated financial instruments, not gambling products subject to state licensing or taxation. The CFTC's approval of its event contracts is the shield. Federal preemption is the argument. It has worked in some courts and failed in others, which is precisely why the Supreme Court petition exists.

What Bailey's statement introduces is a different pressure vector. Litigation is slow. Tax liability is immediate. If a state attorney general were to formally conclude that prediction market sports contracts fall within an existing state tax framework — not a new law, the existing one — the collection mechanism is already built. The licensed operators who pay those taxes have every incentive to support that interpretation and the resources to argue it.

I want to flag my own bias here: I find the tax exposure argument more structurally threatening to the prediction market model than most of the litigation coverage suggests, which means I am probably weighting it too heavily. The federal preemption argument is real and the CFTC's posture has generally favored Kalshi. But I have watched regulatory arbitrage close faster than expected when state revenue officers get involved, because tax enforcement does not require the same evidentiary standard as a gambling violation proceeding.

The NFL's parallel campaign — its second formal letter this year demanding platforms delist injury, officiating, and single-play contracts — adds another layer. If platforms voluntarily remove the contract types that look most like traditional sports wagers, the tax argument gets harder to make. If they do not, the argument gets easier. Kalshi's MLB partnership and its 83% sports volume share suggest the commercial imperative is running ahead of the legal settlement.