Federal Judge Blocks Illinois From Enforcing Key Prediction-Market Rules

A federal judge in Illinois has dealt a significant setback to the state’s attempt to regulate prediction markets as a form of sports wagering, ruling that much of Illinois’ regulatory framework is likely preempted by federal law.

U.S. District Judge Martha M. Pacold of the Northern District of Illinois granted preliminary injunction relief sought by Kalshi, the Commodity Futures Trading Commission (CFTC) and Coinbase, concluding that the sports-related contracts at issue are likely “swaps” governed by the federal Commodity Exchange Act. The decision prevents Illinois, at least while the litigation proceeds, from enforcing a range of licensing and operating requirements against the federally regulated prediction-market business.

The ruling, issued October 2, does not resolve every issue. In particular, Pacold declined to make a final determination on Illinois’ transaction fees and other charges imposed on prediction-market activity, ordering additional briefing on whether those fees are sufficiently burdensome to amount to prohibited state regulation.

The case represents an important victory for prediction-market operators in an increasingly broad legal fight between states seeking to treat event contracts as gambling and federal authorities insisting that such markets fall principally within the CFTC’s jurisdiction.

How prediction markets work

Pacold’s opinion begins by explaining the mechanics of Kalshi’s platform. Users can purchase contracts based on whether a particular event will occur. Unlike a conventional sportsbook, where the bookmaker establishes odds, prices on Kalshi are determined by users buying and selling contracts.

The court illustrated the system with sports and entertainment examples. A contract might trade for 35 cents, effectively reflecting the market’s collective assessment that an event has roughly a 35% chance of occurring. Users who believe the market has mispriced a contract can buy what they consider an undervalued position or sell one they consider overpriced.

That distinction became central to the jurisdictional dispute. Illinois viewed at least some of these products as sports wagers subject to its gambling laws, while Kalshi and federal regulators argued that the contracts are financial instruments falling within the federal derivatives regime.

Illinois sought to regulate Kalshi as a sports-wagering operator

The dispute intensified after Kalshi began listing sports-related contracts. Illinois sent cease-and-desist correspondence asserting that the company's activities violated the state Sports Wagering Act.

Under the state's framework, operators engaging in sports wagering must obtain a license and comply with extensive restrictions. Among other requirements, Kalshi would have been required to prevent people under 21 from buying and selling its contracts and could accept wagers only from people physically located in Illinois.

The rules also govern which sporting events could serve as the basis for contracts and impose requirements concerning the data sources used in administering those contracts. Violations of the civil requirements can also trigger criminal consequences.

Pacold concluded that these provisions do considerably more than regulate conduct between individual customers and businesses. They attempt to dictate how a federally regulated market itself operates.

The judge said compliance could effectively require Kalshi to create a market specifically tailored to Illinois, with the company facing criminal penalties if it failed to follow the state's requirements. Such regulation, she concluded, conflicts with the federal government's interest in maintaining a uniform regulatory system for federally regulated derivatives markets.

The Commodity Exchange Act was decisive

At the center of the ruling is the Commodity Exchange Act, which gives the CFTC exclusive jurisdiction over specified financial instruments traded on federally designated markets.

Kalshi operates as a designated contract market, a type of federally regulated marketplace for financial instruments. The court therefore examined whether its sports contracts fit the statutory definition of a “swap.”

Pacold found that many of the contracts at issue likely do.

The relevant portion of the federal statute covers contracts whose value depends on the occurrence or nonoccurrence of an event associated with a potential financial, economic or commercial consequence. The judge concluded that the statutory language is broad enough to encompass at least the representative sports contracts presented by the parties.

A contract based on the winner of a championship, for example, can have the requisite connection to a potential financial, economic or commercial consequence. The court emphasized, however, that the definition is not limitless. A contract based on an event whose consequences are too remote or trivial would not necessarily qualify.

The judge pointed to an example discussed during oral argument: a contract predicting what color sports drink might be dumped on a coach after a Chicago Bears victory. That type of outcome, she concluded, lacks the concrete and material consequences necessary to fall within the statutory definition of a swap.

The distinction means the decision is not necessarily a blanket ruling that every prediction-market contract is federally protected. Pacold deliberately limited the analysis to the types of contracts presented in the litigation.

Illinois' licensing requirements were the clearest problem

Once the sports contracts were deemed likely to be swaps, the court turned to whether Illinois could nevertheless impose its own rules on them.

The answer was largely no, at least with respect to the licensing and operational provisions challenged in the case.

Pacold relied heavily on Seventh Circuit precedent emphasizing Congress' goal of placing federally regulated futures and derivatives markets under a uniform regulatory system. State requirements that directly interfere with the operation of such markets can therefore be preempted.

Illinois' requirements were found to cross that line because they would determine what Kalshi could sell, which sporting events could underlie contracts, where transactions could occur and who could participate.

The court also rejected the argument that Illinois could regulate the contracts because they might themselves violate federal restrictions concerning gaming-related contracts.

Federal rules allow the CFTC to prohibit certain event contracts that are contrary to the public interest, including contracts involving gaming. Illinois argued that if Kalshi's contracts were improperly listed under those federal provisions, state laws could not be interfering with legally permissible trading.

Pacold found that argument unpersuasive at this stage. The CFTC has substantial authority over what may be traded on designated contract markets, but it has not determined that Kalshi's contracts are impermissible gaming contracts and has not ordered the company to remove them. Moreover, the federal regulator is supporting Kalshi's position in the litigation.

The judge concluded that allowing Illinois to regulate the same federally regulated activity would effectively subject Kalshi to non-uniform requirements imposed by a state.

Fees remain an unresolved issue

The court drew an important distinction between Illinois' licensing and operating requirements and the state's attempt to impose fees.

Illinois' fiscal 2027 budget added a transaction charge on “exchange wagers,” defined broadly to include agreements, contracts, transactions or swaps offered, traded or executed on a prediction market or exchange tied to a sporting contest or event.

The new law establishes a 1.75% transaction fee on a platform's first five million exchange wagers in a fiscal year and a 3.5% fee on subsequent exchange wagers.

Those charges sit alongside existing sports-wagering fees, including a 15% fee on gross sports-wagering receipts and a separate 25-cent or 50-cent charge per wager, depending on the applicable provision.

Pacold did not extend the preliminary injunction to definitively resolve whether those fees are preempted.

The judge noted that states can sometimes impose taxes or other costs on federally regulated activities without impermissibly regulating the underlying activity. A fee that merely produces an indirect economic effect is not necessarily the same thing as a law dictating how a market must operate.

At the same time, the court left open the possibility that a sufficiently severe fee could become a form of regulation in disguise.

Pacold summarized the principle by observing that what a state cannot do directly may not necessarily be accomplished indirectly through an excessively burdensome fee. The court therefore ordered additional briefing and potentially evidence concerning the actual effect of Illinois' fees.

The issue could ultimately turn on whether the charges merely increase the cost of doing business or instead make the federally regulated activity economically impracticable.

The plaintiffs themselves acknowledged that the answer may depend on how the fees are calculated and applied, with the possibility that they could “effectively operat[e] as an outright ban” on Kalshi's swaps.

The court found the threat of enforcement sufficient to justify an injunction

Pacold also concluded that Kalshi, Coinbase and the federal government had demonstrated irreparable harm sufficient to warrant preliminary relief.

Without an injunction, the private companies would have faced a choice between stopping their activities in Illinois or continuing while risking civil and criminal penalties under laws the court believed were likely preempted.

The judge found that ordinary monetary damages would not provide an adequate remedy. Illinois enjoys sovereign immunity from damages claims in the circumstances at issue, while the companies also alleged that losses to their businesses and profits would be difficult to calculate after the fact.

Illinois had argued that the plaintiffs waited too long to seek relief and that the doctrine of laches should prevent an injunction.

Pacold rejected that argument. Coinbase had waited until after announcing its partnership with Kalshi before bringing its challenge, and the court found that timing understandable because Coinbase's standing to sue earlier was questionable.

Kalshi and the federal government had waited longer to challenge some of the older provisions, but the judge said delay by itself was insufficient to establish laches. Illinois also had not demonstrated the kind of prejudice that would justify denying equitable relief.

Consumer-protection concerns did not change the result

Illinois argued that unregulated sports prediction markets create serious public-policy problems, particularly because wagering can be addictive and may be especially attractive to younger people.

The court acknowledged those concerns but concluded that they could not overcome the federal allocation of regulatory authority.

In a pointed passage, Pacold wrote that such concerns had been assigned by Congress to the CFTC rather than to the courts.

The judge ultimately found that Illinois and the public had little interest in enforcing laws that were likely preempted, while the federal government had a strong interest in preserving the authority Congress had assigned to it.

The court cited the public interest in ensuring that federal agencies operate according to federal law and in preserving federal supremacy.

A significant but preliminary victory

Pacold's ruling is not a final judgment on the merits. The court granted the plaintiffs' motions only in part and continued them in part, leaving the fee questions for additional proceedings.

Still, the decision establishes a substantial preliminary finding: Illinois is likely barred by federal law from imposing its own licensing and market-operating requirements on the sports-related swaps at issue.

The ruling also carries significance beyond Illinois because it adds another decision to a growing nationwide dispute over who has authority to regulate prediction markets.

States have increasingly argued that products offered by companies such as Kalshi resemble conventional sports betting and should therefore be subject to state gambling laws, including licensing, taxation, age restrictions and consumer-protection rules. Federal authorities, by contrast, have maintained that qualifying event contracts traded on federally regulated markets fall within the CFTC's exclusive jurisdiction.

That conflict has already produced divergent decisions in other jurisdictions, increasing the likelihood that the question will eventually require resolution at a higher appellate level. A recent federal appellate ruling elsewhere had favored state authority, while the Illinois decision now provides a significant counterpoint.

For Kalshi, the immediate consequence is that Illinois cannot proceed as though its prediction-market licensing regime automatically applies to the company's federally regulated sports contracts. For Illinois, however, the decision does not eliminate every avenue for taxing the activity. The unresolved fee question could become the next major battleground.

Pacold's bottom line was that many of the financial instruments before the court are likely swaps under federal law, even though they are presented to users in an entertaining and wager-like format. The judge described them as instruments “that people find entertaining and fun,” but concluded that their character under federal law turns on the statutory definition rather than on how much they resemble traditional gambling.

The preliminary injunction therefore gives prediction-market operators a major temporary shield in Illinois while leaving open one of the most consequential questions in the dispute: how far a state may go in taxing a federally regulated prediction market before a fee becomes regulation that federal law forbids.

By fLEXI tEAM