Illinois Republican files bill to exempt prediction markets from taxes

A Republican state representative introduced a bill last week that would erase Illinois's tax on sports-event contracts before those contracts generate a single dollar in state revenue — and before the legal architecture holding that tax in place has been tested.

The bill, House Bill 5811, introduced by state Rep. Travis Weaver, would remove the definition of "exchange wager" from Illinois's Sports Wagering Act and repeal the transaction tax that sits on top of it: 1.75% on the first five million contracts a platform executes in a fiscal year, 3.5% on every contract after that. The tax was signed into law as part of Governor JB Pritzker's fiscal-year 2027 budget. Weaver wants it gone before it has the chance to become politically load-bearing.

His logic is straightforward and worth taking seriously. A tax that generates no revenue is easy to repeal. A tax that funds a line item in the state budget is not. Weaver told CDC Gaming directly: "if the tax is determined to be legal and begins generating revenue for the state, then it gets hard to kill it." That is not ideology. That is a legislator reading the institutional physics of his own chamber correctly.

The Illinois framework is more aggressive than any other state's attempt to capture prediction market revenue. It requires platforms to obtain a state license — initial fee of fifteen million dollars, valid for four years — and taxes every trade on a contract tied to a sporting event. Kalshi and the CFTC have already challenged those provisions in court on preemption grounds. The state appropriated money for its attorney general to defend the law. It did not appropriate revenue from the law, because none has arrived.

Here is where I part from the consensus read on this bill. Most observers will treat HB 5811 as a long shot — a minority-party filing with no Democratic co-sponsors in a state where Democrats control the chamber, scheduled for consideration in a six-day veto session or, more likely, the January 2027 session. That framing is accurate but incomplete.

The relevant question is not whether Weaver's bill passes. It is whether the Illinois preemption litigation resolves before the legislature reconvenes. If the Supreme Court takes the Kalshi case and signals that federal derivatives jurisdiction covers sports-event contracts, Illinois's exchange-wager framework collapses on its own — and Weaver's bill becomes moot in the best way possible for Kalshi. If the Court declines or rules narrowly, Illinois keeps its statute, the revenue eventually materializes, and Weaver's window closes exactly as he predicts it will.

I have watched legislatures treat a legal challenge to a tax line as sufficient reason to leave the underlying policy alone. They are not wrong to do that — litigation is cheaper than repeal, and the outcome might do the work for them. But Weaver's bet is that the litigation timeline runs long enough for the tax to embed itself institutionally before any court resolves the preemption question.

The standard that governs this analysis is the one the 10th Circuit applied to Kalshi in Utah last week: likelihood of success on the merits, threat of irreparable harm, balance of equities, public interest. Kalshi failed that test in Utah. Illinois has constructed a more elaborate statutory foundation than Utah did, which gives its framework more surface area to defend. The preemption argument that could displace HB 5811's target was not strong enough to earn injunctive relief in two circuits. Whether it is strong enough to earn a merits ruling from the Supreme Court is a different calculation — and a slower one than Weaver's veto session window allows.