Illinois did not ban Kalshi. It taxed it and asked for a licence

Illinois took the approach nobody else did. Rather than argue about whether event contracts are gambling, it wrote prediction markets into its Sports Wagering Act, applied a tax, and required the same licence a sportsbook needs.

Kalshi sued to stop it, and the numbers in that fight are the most concrete on this whole subject.

Three questions get answered as though they were one

Most state lists you will find are answering a different question from the one in their headline. The three that get run together:

1. Is it lawful for me to trade here? State law.
2. Will the platform let me in? Geofencing, which the platform sets and can change without notice.
3. Am I eligible for the sign-up promo? A marketing offer.

The state legality hub sets out which attorneys general have taken a position on the record, across all fifty-one jurisdictions, and Kalshi legality by state indexes every state with a court record in one line each.

What follows, and where it comes from

Illinois signed the 37-state brief. The rest of this page is Illinois specific. Where a claim rests on reporting rather than on a document we read ourselves, it says so at that point rather than in a footnote.

What Senate Bill 3019 actually does

SB 3019 amended the Illinois Sports Wagering Act to apply a tax of 1.75% on the first 5 million sports wagers made on prediction markets in a fiscal year, and 3.5% on wagers after that. It also requires an Illinois sports betting licence. Both were set to take effect on 1 July. Illinois classifies Kalshi and its peers as unlicensed sports wagering operators offering the same bets as DraftKings and FanDuel without paying taxes or meeting reporting standards.

The licence is not a formality

The initial licence fee for an online and mobile sports wagering operator in Illinois is $15 million, valid for four years, with renewals at $1 million per four years. Kalshi, reported at a $22 billion valuation, called the licensing “costly and burdensome” in its complaint. Whatever you make of that, it is a real number attached to a real requirement, which is more than most of this debate offers.

The geolocation clause is the interesting one

Illinois requires that a licensee “may only accept an entry from a person physically located in the state”, which means geolocation tracking. Kalshi says complying would put it in “direct violation” of the CFTC requirement that contract markets offer nationwide and uniform access. That is not a rhetorical conflict: it is the same impossibility argument a federal court accepted in Arizona, where CFTC rules requiring impartial access were held to conflict with state licensure.

Kalshi's ground, in its own words

The complaint opens by saying it “challenges the State of Illinois's clear violation of the Supremacy Clause with respect to the regulation of event contracts”, arguing event contracts are exclusively for the CFTC. Kalshi filed before the law took effect, seeking to block it rather than defend a prosecution afterwards.

The federal regulator sued Illinois too

In April the CFTC sued Illinois to assert its own jurisdiction, after the Illinois Gaming Board sent cease-and-desist letters to operators including Kalshi and Polymarket. The regulator's argument, as reported, is that sports event contracts are closer to grain futures than to sports wagers. Illinois is therefore defending on two fronts, against the exchange and against the federal government.

The provisions in play

Section numbers are given so you can look them up. Where we have not read the provision directly, the sources list says so.

What we could not verify

• The complaint and the docket. We read reporting that quotes the complaint, not the filing itself, so the case caption and number are absent here.
• Whether the law took effect on 1 July as scheduled, or was enjoined.
• The CFTC's suit against Illinois. We have its existence and its month from reporting, not the filing.
• The current tax take, if any. Not published that we found.

Questions people actually type

Is Kalshi legal in Illinois? There is no yes or no here that would be honest. This page sets out what Illinois has actually done, what its law says, and what a court has or has not decided, so you can see the state of play rather than a verdict nobody has issued.

Has Illinois taken action against Kalshi? The section above answers this for Illinois specifically. Across the country, reporting we read describes fifteen states having sued, investigated or sent cease-and-desist orders over gambling licensure. The states differ, and a page that gives one national answer is flattening that.

Does the CFTC designation settle it? No. Kalshi is a CFTC-designated contract market and nobody disputes that. Whether the designation displaces state gaming law is the contested question, argued through 7 U.S.C. section 2(e) and the clear-statement rule in Whitman, 531 U.S. 457, 468 (2001). Two federal district courts have answered it differently.

Can I be prosecuted for trading in Illinois? We are not lawyers and this is not legal advice. The filings we read are about whether the exchange may offer the contracts, not about individual traders. If that is your real question it is one for someone licensed to answer it in Illinois.

Is the app blocked in Illinois? We have not tested it. Geofencing is a platform setting that changes without notice and is a different question from legality.

How many states are arguing this? Thirty-seven states plus the District of Columbia signed the brief, which is 38 jurisdictions, and Massachusetts is separately the party bringing the case. The full signature block is on the state legality hub.

What this page is not

It is not legal advice and we are not lawyers. It is a reading of public documents and reporting, all linked, so you can check it yourself.