Missouri challenges prediction markets' sports wagering tax status
Missouri is challenging prediction markets over their treatment of sports wagering, citing concerns about state sports betting tax revenue. The markets use probability-based pricing rather than traditional American odds, a distinction that affects how they are classified and taxed. The Treasury Inspector General for Tax Administration has also issued compliance recommendations for managers. The scrutiny adds Missouri to a growing list of states examining whether CFTC-registered event contract platforms should pay gambling taxes.
Kalshi and Polymarket now face tax classification risk in Missouri on top of active enforcement orders in multiple states. The probability-based pricing that distinguishes prediction markets from traditional sportsbooks is exactly what Missouri regulators are targeting. A tax reclassification would force platforms to either reprice contracts in American odds or absorb state gambling tax rates that erode thin margins.
Traders hold positions whose regulatory treatment shifts with state borders, not federal rules. The Treasury Inspector General's parallel compliance push adds a federal layer that could standardize reporting requirements across states. Each new state that treats event contracts as gambling narrows the operational gap between CFTC registration and state gaming licenses. Platforms must build tax-engineering capacity before more states follow Missouri's reasoning.
Missouri's tax scrutiny joins state enforcement actions in Connecticut, Nevada, and Washington that are fragmenting the preemption shield CFTC-registered platforms have relied on.