The day before Thanksgiving 2022, Maryland’s mobile market went live. Thanksgiving Day brought three NFL games, so within roughly 24 hours of launch the new apps had a full slate of live football to price. It was the fastest way imaginable to stress-test a state’s geolocation system.
Maryland in one paragraph
Sports betting Maryland bettors can use is legal online statewide and at retail sportsbooks, for anyone 21 or older who is physically in the state. Retail opened on December 9, 2021; mobile followed on November 23, 2022. The Maryland Lottery and Gaming Control Agency licenses operators. In-play betting is widely available, with one firm exception: player props on college athletes are not offered, before or during a game.
Every neighbor is legal too. Pennsylvania, Delaware, Virginia, West Virginia and Washington, D.C. all have online markets, so the Baltimore-Washington corridor is effectively one large regulated region split into separately licensed pieces.
From ballot question to launch
Question 2, November 2020
Maryland put the question to voters before writing a single rule. Question 2 asked whether to authorize sports and events betting for the primary purpose of raising revenue for education. It passed with about 66.3 percent of the vote, 1,319,439 yes against 671,988 no in the state’s posted results, and it won majorities in all 23 counties and Baltimore City.
Two launches a year apart
The referendum authorized betting; it did not set it up. The General Assembly then wrote the licensing framework, and the first retail sportsbooks, at casinos, took bets on December 9, 2021. Online licensing took almost another year. Mobile wagering finally opened on November 23, 2022, the Wednesday before Thanksgiving.
The field grew from there. CBS Sports counts twelve online sportsbooks operating in Maryland, one of the larger menus in the country, which matters for live bettors because more books means more prices to compare during a game.
The rules that shape a live bet
Age and location
The minimum age is 21. The phone must be inside Maryland when the bet is placed. Near the Potomac this matters: a phone in Bethesda is in Maryland, a phone in Arlington is in Virginia, and a phone at Nationals Park is in D.C., each under its own rules. The age rule shifts at that border too. Washington, D.C. sets its minimum at 18, one of only a few US markets that low, so a 19-year-old can bet legally on a phone at Nationals Park and be refused a few miles north in Silver Spring, Maryland. A phone that has drifted across a river since the last location check will usually be asked to verify again before the next live bet goes through.
The college player prop ban
Maryland does not allow player props on college athletes. A July 2026 compilation of state rules dates the current ban to March 2024, and Missouri Gaming Commission staff listed Maryland in January 2026 as one of four states that had banned college player props outright, along with Louisiana, Ohio and Vermont.
The practical effect for live bettors is clear. During a Terrapins basketball game, the live spread, total and moneyline are on the board. Markets on one player’s points, rebounds or three-pointers are not, pregame or in-play.
Professional sports
Bets on the Ravens, the Orioles or the Commanders face no such limit. The Capitals and Wizards play their home games inside D.C., so a Maryland fan betting from a seat at the arena is under the District’s rules, not Maryland’s. In-play player props on pro athletes, quarter and inning markets, and live same game parlays are all available, subject to each sportsbook’s catalog.
The neighbors draw the college line differently. Virginia keeps its own schools and all college player props off the board, per the snapshot used for the state table, while West Virginia reports no college restrictions. A Terrapins fan in Cumberland who crosses into West Virginia moves from a market with no college props to one where they may be on offer.
Tax: the operator’s rate and the bettor’s rate
What sportsbooks pay
Maryland originally taxed sports wagering revenue at 15 percent. In 2025 the governor proposed raising the mobile rate to 30 percent. Lawmakers settled on 20 percent in the Budget Reconciliation and Financing Act, House Bill 352, which Governor Wes Moore signed in May 2025. The retail rate stayed at 15 percent. Sources disagree on exactly when the higher rate took effect, so the date is left out here.
Most of the money goes to the Blueprint for Maryland’s Future Fund, the state’s long-term education plan. A small slice goes to the general fund.
What a bettor pays
Winnings are income. Maryland’s state income tax is graduated, with brackets of 6.25 percent from $500,001 to $1 million and 6.5 percent above $1 million for single filers, and every county and Baltimore City adds its own local tax, generally in the 2.25 to 3.2 percent range. Most filers sit far below the top brackets; Maryland’s scale starts at 2 percent on the first slice of taxable income. The IRS taxes gambling winnings federally, and from tax year 2026 losses are deductible only up to 90 percent of their amount, on an itemized return.
A worked example: a live parlay on Ravens Sunday
Same game parlays are a big part of in-play betting, and Maryland allows them on pro games. Suppose that early in the third quarter a bettor combines two live legs on a Ravens game: Ravens moneyline at -150 and the game total over 44.5 at -110.
Convert each leg to decimal odds. For negative American odds, decimal = 1 + 100 ÷ |odds|. So -150 becomes 1 + 100 ÷ 150 = 1.6667, and -110 becomes 1 + 100 ÷ 110 = 1.9091. A standard parlay multiplies them: 1.6667 × 1.9091 = 3.1818. In American odds that is (3.1818 − 1) × 100 = +218.
A $15 parlay at those prices would return $15 × 3.1818 = $47.73, a profit of $32.73. In practice, same game parlays are usually priced below the straight multiplication, because the legs are correlated: a Ravens win and a high-scoring game are not independent events. The quote on the screen will often be lower than +218, and the gap is part of the sportsbook’s margin. If the app offers +190, the same $15 earns $15 × 190 ÷ 100 = $28.50 in profit, $4.23 less than the uncorrelated price. Whether that discount is fair depends on how strongly the two legs move together, which nobody outside the book can measure precisely. The parlay calculator shows the uncorrelated price, which is a useful ceiling to compare against.
On the tax side, the $32.73 profit is income for a Maryland resident at both state and county rates.
Twelve books, one game: why price shopping matters live
A large menu of licensed sportsbooks changes what a careful bettor can do during a game. Prices on the same live market rarely match across apps, because each book runs its own model and its own risk position.
Suppose the Orioles trail by a run in the seventh. One app shows their live moneyline at +150, another at +165. On a $20 bet the first pays $20 × 150 ÷ 100 = $30.00 profit, the second $20 × 165 ÷ 100 = $33.00. The implied probabilities are 100 ÷ 250 = 40.00 percent and 100 ÷ 265 = 37.74 percent, so the better price asks the team to be about 2.3 points less likely to win for the same payout.
Three dollars on one ticket is small. Across a season of in-play bets it is the difference between paying the full margin and paying part of it. The limit is speed: during a live game, the better price can vanish before a second app opens, and a bet delay applies on both.
Self-exclusion and help in Maryland
The Maryland Lottery and Gaming Control Agency runs a Voluntary Exclusion Program that covers sports wagering along with casinos, the Lottery, bingo halls and daily fantasy contests. Enrollment lasts at least two years or a lifetime, and an enrollee who wants back in has to apply to be removed; it does not lapse on its own. Someone who excludes from casinos is also barred from those casinos’ affiliated mobile sportsbooks. Breaking an exclusion can lead to a criminal trespassing charge.
The Maryland Center of Excellence on Problem Gambling offers free counseling to Maryland residents and refers callers to the exclusion program. The national lines on the responsible gambling page also answer calls from Maryland. If you notice in-play betting creeping from one game a night to every game on the screen, the exclusion can be set for sports wagering alone.
The side-track: what the referendum promised
Question 2’s wording promised that betting revenue would go primarily to education, and that promise has shaped every later tax fight. When the governor sought 30 percent in 2025, the education fund was the stated reason, and lawmakers trimmed the request by a third.
The compromise at 20 percent left Maryland’s mobile rate level with Ohio’s and Illinois’ base rate. By one 2025 count, sports betting had sent more than $160 million to the Blueprint fund since December 2021. At the new mobile rate, every $100 a sportsbook keeps from Maryland bettors now sends $20 to the state instead of $15.