Kalshi has taken Illinois to court rather than pay a tax bill that no other state is sending.
Last Tuesday, Kalshi sued Illinois Attorney General Kwame Raoul, Governor J.B. Pritzker, and other state officials after Illinois classified the prediction market — and others like it — as unlicensed sports wagering operators. The lawsuit lands at a fragile moment: prediction markets just logged their biggest week ever, buoyed by the NBA Finals, the World Cup, and the Stanley Cup running simultaneously. If Illinois prevails, Kalshi faces a tax burden unique among U.S. states and potential felony exposure for past violations. The company has the most to lose here — it is the largest prediction market for sports bets.
The core dispute is a familiar one dressed in new clothes: states argue prediction markets are taking the same bets as licensed sportsbooks, just without the licensing fees, tax obligations, or consumer protections that come with state gambling frameworks. Prediction markets operate under federal CFTC oversight and have long insisted they are financial instruments, not gambling products — a distinction states are increasingly unwilling to accept. Illinois is not the first state to push back, but it is the first to attach felony-level consequences to the argument.
The outcome could set a template that other revenue-hungry states copy quickly — or hand Kalshi a precedent that keeps regulators at bay for years.