Prediction market operator Kalshi has sued the State of Illinois in federal court to stop a new law that would tax and license its sports event contracts as if they were sports bets, escalating a fight that pits federal commodities oversight against state gambling regulators. Kalshi filed the case in the U.S. District Court for the Northern District of Illinois on 26 June 2026, as reported by Capitol News Illinois.
The target is Senate Bill 3019, which amended the Illinois Sports Wagering Act to bring prediction markets inside the state's betting regime. The measure imposes a 1.75% tax on the first five million sports-linked wagers per fiscal year and 3.5% on volume above that, alongside a sports wagering licence requirement. The new obligations are set to take effect on 1 July 2026.
The licensing terms are steep. SB 3019 would require a $15 million initial fee covering four years, with $1 million renewals thereafter, plus geolocation controls that limit access to people physically inside Illinois. Kalshi has asked the court for a temporary restraining order and a preliminary injunction to block the rules before they bite.
Kalshi named Governor JB Pritzker, Attorney General Kwame Raoul, Illinois Gaming Board Administrator Marcus Fruchter and four board members as defendants in their official capacities. Its central argument is that event contracts are financial instruments regulated exclusively by the federal Commodity Futures Trading Commission, and that Illinois violates the Supremacy Clause by treating them as sports wagers.
The dispute sits inside a wider jurisdictional clash. The CFTC itself sued Illinois in April 2026, asserting that prediction market contracts resemble commodity futures more than bets. Several states, including New York and Wisconsin, have moved to classify the products as gambling and pull them under state licensing.
For bettors, the stakes are practical. If prediction markets are forced into state sportsbook regimes, the products, pricing and tax treatment they offer could change, and access in individual states could narrow. For operators, the case may set a precedent on whether a federally registered exchange can offer sports outcome contracts nationwide without state betting licences. A ruling on the injunction is the next milestone to watch, with the 1 July effective date bearing down.