How Is Sports Betting Regulated in the US, and How Do You File a Complaint?

In the United States, sports betting is regulated state by state. Each legal state decides whether to allow it, licenses the operators, sets the tax rate and rules, and runs a regulator — usually a gaming commission or a lottery — that can fine or pull a license. Where tribes offer betting, they do it under gaming compacts with the state that the federal government has to approve. Contracts on sports traded on federally registered exchanges, such as Kalshi, fall under the Commodity Futures Trading Commission, and whether states also get a say is being litigated as of September 27, 2026.

For a bettor, the practical version: if your problem is with a licensed sportsbook, you complain to the book first and then to your state regulator. The rest of this guide explains who that is, what they make the book do, and how to file.

General information, not legal advice.

Who regulates what?

State regulators license sportsbooks. Since Murphy v. NCAA struck down the federal ban in 2018, each state writes its own sports betting law. The American Gaming Association's State of the States 2026 report shows how much the rules differ. Headline tax rates on sportsbook revenue run from 6.75% in Iowa and Nevada to 51% on online betting in New York, and Illinois's graduated scale tops out at 52.25% plus a per-bet charge on online wagers. Tennessee taxes 1.85% of the amount wagered instead of revenue. Some states forbid betting on in-state college teams. Others, Ohio among them, ban player props on college athletes. Every one of those rules comes from the state, not Washington.

What the tax rate means in dollars: a sportsbook's taxable revenue is roughly what bettors lost to it. On $10 million of that revenue, the state's cut would be $675,000 at 6.75% and $5.1 million at 51%.

The regulator varies. In some states it's a dedicated commission: the Pennsylvania Gaming Control Board, the Ohio Casino Control Commission, the Michigan Gaming Control Board. In New Jersey it's the Division of Gaming Enforcement. In a few states — Delaware, New Hampshire and Rhode Island in the AGA's table — the state takes a share of 50% or more of revenue rather than levying a conventional tax. Whatever its name, the agency that publishes your state's list of licensed books is the one you'd complain to.

Tribes regulate gaming on their lands, under compacts. The Indian Gaming Regulatory Act says casino-style ("Class III") gaming is lawful on Indian lands only if three conditions hold. It must be authorized by a tribal ordinance approved by the National Indian Gaming Commission's chairman. It must be in a state that permits such gaming. And it must be conducted under a Tribal-State compact that is in effect. The Secretary of the Interior approves compacts. In practice that means tribal sports betting, including mobile betting in states where tribes run it, requires the state and tribe to agree terms and Washington to sign off. Florida's statewide mobile betting is tribal only. Wisconsin's new online law, signed in April 2026, is waiting on exactly that compact process.

The CFTC oversees event contracts on registered exchanges. Prediction markets registered as designated contract markets are supervised federally. Several states argue their gambling laws still apply to sports contracts on those exchanges. As of September 27, 2026, the federal appeals courts have split: the Third Circuit sided with Kalshi, while the Ninth and Sixth sided with the states. Our prediction markets vs sportsbooks guide has the dated rundown.

Federal criminal law targets unlicensed operators. Statutes such as the Wire Act and the Unlawful Internet Gambling Enforcement Act are why offshore and interstate operators can't simply serve the whole country; see are offshore sportsbooks safe.

What does a licensed sportsbook have to do?

Rules differ by state, so we'll use one state's regulations as the worked example. New Jersey's online gaming rules are detailed and publicly posted.

Know who you are. Before an account opens, the operator must collect and verify your legal name, date of birth, and, if you provide it, the full or last four digits of your Social Security number. It must use "multi-source authentication," checking third-party and government data, and confirm you are 21 and not on the self-exclusion list. After five consecutive failed deposit attempts within 10 minutes, it must temporarily block the account to investigate fraud.

Know where you are. Every wager must come from inside the state, verified by geolocation at login and at intervals; see how sportsbook geolocation works.

Offer responsible-gaming tools. New Jersey requires operators to offer:

• deposit limits by day, week and month
• spend limits by day, week and month
• a daily time limit
• a patron-requested account suspension ("cooling off") of at least 72 hours

Once your lifetime deposits pass $2,500, the operator must have you acknowledge that these limits exist and show you the 1-800-GAMBLER helpline.

Honor self-exclusion. When a player self-excludes, pending wagers must be voided within three days and cashable funds refunded within 90 days.

Handle complaints. The Division of Gaming Enforcement "requires all operators to have effective systems in place for receiving, recording, managing and investigating Internet gaming customer complaints."

Other states' rules look similar in outline and differ in detail. Books must also publish house rules on how they settle bets, which is where most disputes are decided; the Academy's sportsbook house rules and settlement rules guides explain the common ones. What regulators generally don't do is force a book to keep accepting your bets. Books can and do limit winning customers, which the Academy covers in why sportsbooks limit bettors.

How do I file a complaint with a regulator?

The sequence is the same almost everywhere.

1. Complain to the sportsbook first, in writing. Use its support channel, keep the ticket or case number, and save screenshots of the bet slip, the market, the time, and the book's response. Regulators expect this step, and some require it.
2. Read the house rule the book is relying on. Many disputes turn on a published rule (a player not starting, an obvious-error price, overtime), and knowing which rule applies tells you whether you have a case.
3. Escalate to your state regulator with the book's response attached. Be specific: the bet ID, the amount, what you think should have happened and why.

Three real examples, checked September 27, 2026:

Pennsylvania. The Gaming Control Board's complaint and dispute page has a separate Online Sportsbook form. It distinguishes a complaint, a disagreement that doesn't involve money, from a dispute, "a claim for a specific amount of cash or merchandise." You have 30 calendar days from the incident to file. Every filing gets a case number and an investigator, and alleged criminal violations are referred to the Pennsylvania State Police.

New Jersey. The Division of Gaming Enforcement's Internet gaming disputes page defines a dispute as an "unresolvable complaint after all reasonable means have been exhausted" with the operator. You must file with the operator first and attach both your original complaint and its response to the Internet Gaming Dispute Form. Questions go to (609) 984-0909 or igaming@njdge.gov.

Ohio. The Casino Control Commission's complaint page directs anyone with an issue involving "an online sportsbook application or website, or brick-and-mortar sportsbook facility in Ohio" to its Patron Inquiry Form. The Commission is candid about limits: it can't give legal advice or "bring any legal action on your behalf," it recommends going to the business first, and what you submit may become a public record.

For a prediction market, a state gaming regulator has no process. Complain to the exchange, then to the CFTC, whose tip and complaint page offers a Complaint Form, the whistleblower Form TCR, a toll-free line (866-366-2382), and a Reparations Program for customer complaints against futures industry professionals.

For an offshore or sweepstakes site, there's usually no regulator whose complaint process applies to you. That gap is the main risk; see offshore sportsbooks and sweepstakes sportsbooks.

What can a regulator actually do for me?

Less than a court and more than nothing. A regulator investigates whether the operator broke the rules it's licensed under, and it can fine or discipline the operator. Pennsylvania's process explicitly covers disputes over "a specific amount of cash." Ohio says outright it can't act as your lawyer. If the issue falls outside a regulator's jurisdiction, a private lawyer is the next step.

The honest summary: the complaint process is the single most valuable thing a license gives you, and it only exists at books your state has licensed. Start with where sports betting is legal to see which ones those are.

Checked September 27, 2026.