In its first month, Missouri took about 25.6 million sports wagers. Only 48,637 of them were placed at a counter. Everything else, roughly 99.8 percent, came through a phone. For a state that took years to legalize sports betting at all, the market that opened on December 1, 2025 went mobile almost immediately.
The status in one paragraph
Sports betting Missouri residents and visitors can use is now fully legal: online statewide, plus in-person sportsbooks, for anyone 21 or older who is physically inside the state. The Missouri Gaming Commission, which has regulated the state’s riverboat casinos for decades, licenses the operators and approves what can be bet on. Live wagering is part of that menu from the first day.
Missouri is the newest of the legal sports betting states with an online market. No state launched after it in the ten months that followed.
How it became legal: a ballot measure, not a bill
Years of failed bills
Missouri lawmakers filed sports betting bills session after session and never passed one. The sticking point was not sports betting itself. In the Senate, a small group of members insisted that any gambling bill also legalize video lottery terminals, and the chamber kept stalling. In April 2023 an eight-hour debate ended with the VLT proposal rejected 20 to 11 and the sports wagering bill never brought to a vote.
Amendment 2, November 5, 2024
Supporters went around the Legislature with an initiative petition. The campaign, Winning for Missouri Education, was fronted by the state’s six major professional teams, the Cardinals, Blues, St. Louis City SC, Chiefs, Royals and Current, which put in a combined $2 million. National sportsbook companies supplied almost all of the rest of a $43 million effort, a record for a Missouri ballot measure. Amendment 2 asked voters to add sports wagering to the Missouri Constitution, with online and retail betting, a 10 percent tax on operator revenue, and the Gaming Commission as regulator.
The result was about as close as a statewide vote gets. State officials certified Amendment 2 with 50.05 percent support, a margin of under 7,500 votes out of nearly three million cast, about a quarter of one percentage point. Missouri lets the losing side request a recount when the margin is 0.5 percent or less, but there are no automatic recounts, and the opposition committee said it would not ask for one.
The December 1 deadline
The amendment required betting to begin no later than December 1, 2025, and the Commission’s own history page confirms that mandate. Retail sportsbooks and mobile apps launched together on that date, unlike most states, where counters opened months before apps.
Rules a bettor actually meets
Age and location
The minimum age is 21. Apps verify identity at signup and check the phone’s location before accepting wagers. The account works anywhere inside Missouri’s borders and nowhere outside them, unless the bettor is standing in another state where that operator holds a license, in which case that state’s rules govern the bet.
The college rule
Missouri allows betting on college games, including games involving Mizzou, Saint Louis University and the state’s other schools. What it bars is narrower: player props on athletes in games involving Missouri colleges and universities. Props on players in other college games stay on the board. Reports differ on the exact scope of the ban, so the event catalog shown in the app on game day is the practical reference.
In January 2026, after a college basketball betting scandal, the NCAA wrote to state regulators asking them to ban college player props and certain halftime-spread bets. The Commission took the request up on January 22, 2026, and declined to act for now. Its staff told commissioners that only four of the 39 states with sports betting had agreed to the ban: Louisiana, Maryland, Ohio and Vermont.
Taxes
The 10 percent tax is paid by sportsbooks on their revenue, matching the rate in Kansas and among the lowest in the country. For the bettor, winnings are income. Missouri taxes them at its regular graduated rates, with a top rate under 5 percent, and the IRS taxes them federally. Losses are deductible only on an itemized federal return, and from tax year 2026 only 90 percent of losses count.
Live betting in practice, from a Cardinals game
Baseball is where Missouri’s in-play markets get the heaviest daily use from April to September, simply because there is a game almost every night. During a Cardinals game the app reprices after each plate appearance and sometimes after each pitch, with markets on the inning total, the next batter’s result and the live moneyline.
Here is a worked example. In the sixth inning, trailing by one, the home team’s live moneyline is +135. A $20 bet returns $20 × 135 ÷ 100 = $27.00 in profit if the team wins, plus the stake back for $47.00 total.
The implied probability behind +135 is 100 ÷ (135 + 100) = 42.55 percent. If the other side is priced at -160, its implied probability is 160 ÷ (160 + 100) = 61.54 percent. The two add up to 104.09 percent, and the 4.09 points above 100 are the sportsbook’s margin on that market. Live markets often carry a wider margin than pregame ones, so adding up the two implied probabilities before you bet is a quick way to see how expensive a price is.
On the tax side, the $27.00 is income. At Missouri’s top rate, just under 5 percent, the state’s share would be roughly $1.27 to $1.30, and federal tax depends on the bettor’s bracket.
Very short-horizon markets, like the result of the next pitch, are sometimes called micro bets; the micro betting page covers how they are priced and why the margin on them tends to be high.
A second market on the same game
Totals work the same way. Suppose the live total for the rest of that game is 4.5 runs, with the over at -105 and the under at -115. A $21 bet on the over at -105 pays $21 × 100 ÷ 105 = $20.00 in profit, because negative odds show how much must be staked to win $100. If the under wins instead, the bettor loses the $21.
Those two prices imply 51.22 percent and 53.49 percent, a combined 104.71. That is almost exactly the margin on a standard pregame line priced at -110 on both sides, which totals 104.76, so this particular live total is fairly priced by sportsbook standards. The catch is timing. A live line can move again during the short acceptance delay, and if it moves against you the app either rejects the ticket or asks you to accept the new price. A total that looked fair at 4.5 can come back at 5.5 two pitches later.
Missouri among its neighbors
Missouri touches eight states, tied with Tennessee for the most of any state, and the map around it is a patchwork. Iowa, Illinois, Kentucky, Tennessee, Arkansas and Kansas all have statewide online betting. Nebraska allows betting in person only, and Oklahoma has no legal sports betting at all.
That matters most at the two big metro edges. In St. Louis, the Illinois side of the Mississippi has had online betting since June 2020, so a bettor crossing the Poplar Street Bridge moves from one legal market into another. Each state’s rules then apply: Illinois, for one, bans bets on its own college teams, so an in-play prop that is available in Missouri can disappear a mile east. Down at the Bootheel, a bettor in Missouri is a short drive from both Kentucky and Tennessee, which also run online markets.
Oklahoma is the one border where crossing removes access entirely. A Joplin resident heading southwest on Interstate 44 loses the ability to bet a few minutes after leaving the state.
College rules shift at each of those borders too. The snapshot records that Iowa bans props on athletes from its own schools, Tennessee bans all college player props and in-play college team props, and Kansas reports no college ban. A Mizzou player prop that Missouri refuses in a home game could be available in Kansas City, Kansas, a few blocks west.
The side-track: the Kansas years
Before December 2025, the Kansas City metro had a strange geography. Kansas launched online betting on September 1, 2022. For more than three years, a Chiefs fan living in Missouri could drive a few minutes across State Line Road into Kansas, confirm the location in an app, and bet legally on a game being played at Arrowhead Stadium in Missouri.
The line still matters in reverse. A Missouri bettor who crosses into Kansas today is betting under Kansas licenses and Kansas rules for as long as the phone stays there.
Before December 2025, that traffic ran one way. Sportsbooks on the Kansas side collected Missouri bettors’ money, and Kansas collected the tax. Supporters of Amendment 2 leaned on that point, and the amendment’s 10 percent rate is the same one Kansas charges.
The arithmetic of the first month suggests the argument was right about demand. At 25.6 million wagers in December 2025 and 48,637 of them at retail, the counters handled about 1 in every 526 bets placed in the state.