California prediction-market law: court cases and what changed
California's guide to legal, CFTC-regulated prediction markets: compare Kalshi, Polymarket and Novig, plus tax rules, bonuses and CA-specific markets.
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Californians 21+ can use several CFTC-regulated prediction market platforms. For sports contracts, courts are still deciding whether state gambling law also applies: the Ninth Circuit, whose rulings cover California, ruled against Kalshi at the preliminary stage in August 2026. Here's where to start, what changed, what's tradable, and how taxes work.
Looking for the apps first? Start with our guide to California prediction markets. The plain-English legal answer is in Are prediction markets legal in California?; this page keeps the court cases and the dated change log.
Kalshi's status in California: Available — dispute pending (as of October 3, 2026). Details, court rulings and the change-log: Is Kalshi legal in California?
Platforms available in California
| Platform | Regulation | Best for | CA status | Visit |
|---|---|---|---|---|
| Polymarket | CFTC-regulated | Deepest live order book | Available in CA | Visit → |
| ProphetX | CFTC-licensed Designated Contract Market and Derivatives Clearing Organization | Sports-only traders | Available in CA | Visit → |
| Kalshi | CFTC-regulated DCM | Politics and elections | Available in CA | Visit → |
| OG (by Crypto.com) | CFTC-regulated event contracts (via OG) | New traders seeking rewards | Available in CA | Visit → |
| Novig | Peer-to-peer sports event contracts | Experienced sports traders | Available in CA | Visit → |
Also worth knowing: travel-only options
These platforms are not available to California residents at home, but you can use them when physically located in an eligible state.
| Rebet | Social-first peer-to-peer sports prediction. Travel-only: not available to California residents. | Travel-only |
What changed: California legal timeline
Dated court rulings, regulator actions and state moves that affect prediction markets in California, newest first. Each entry links to its source.
- October 9, 2026
CFTC issues interim final rule excluding casino-style gambling products from the definition of swap
The CFTC issued an interim final rule writing into its regulations its position that "casino-style gambling products", such as wagers placed at sportsbooks and on casino games, are not swaps. The rule is final but not yet in effect: it takes effect when it is published in the Federal Register, and it had not been published there as of October 13, 2026.
- October 9, 2026
CFTC proposes to include event contracts in the definition of swap
In a separate notice of proposed rulemaking, the CFTC proposed to define "swap" expressly to include event contracts, including those based on sports, politics, cultural and weather-related events. This is a proposal, not a final rule: public comments are due 30 days after it is published in the Federal Register.
- October 8, 2026
Ninth Circuit mandate issued in the tribes' case against Kalshi
The Ninth Circuit issued its mandate in Blue Lake Rancheria v. Kalshi (N.D. Cal. No. 3:25-cv-06162), which returns the case to the district court. The district court set a status conference for October 21, 2026. No injunction has been entered.
Source: CourtListener docket, Blue Lake Rancheria v. Kalshi Inc.
- September 25, 2026
Sixth Circuit rules against Kalshi in Ohio and Tennessee appeals
The Sixth Circuit held that Kalshi had not shown that federal commodities law overrides Ohio or Tennessee gambling laws for its sports event contracts. The ruling is at the preliminary-injunction stage and covers Ohio, Tennessee, Kentucky and Michigan, not California.
Source: U.S. Court of Appeals for the Sixth Circuit (opinion)
- September 24, 2026
Kalshi disables its markets on three California tribes' lands
Bloomberg Tax reported that Kalshi told a federal court it had voluntarily switched off its prediction markets on the lands of three California tribes, following the Ninth Circuit ruling of September 16.
- September 16, 2026
Ninth Circuit sides with two California tribes against Kalshi
In Blue Lake Rancheria v. Kalshi, the court found the tribes likely to succeed on claims that Kalshi sports contracts offered on their lands violate the Indian Gaming Regulatory Act. It sent the case back to the district court to weigh the remaining injunction factors.
Source: U.S. Court of Appeals for the Ninth Circuit (opinion)
- September 14, 2026
Crypto.com reported to have asked the Supreme Court to review the Ninth Circuit ruling
Sports Betting Dime reported that Crypto.com filed a petition asking the U.S. Supreme Court to decide whether federal commodities law overrides state regulation of sports event contracts.
- September 10, 2026
Kalshi seeks Ninth Circuit rehearing; Robinhood petitions the Supreme Court
Sports Betting Dime reported that Kalshi asked the full Ninth Circuit to rehear its Nevada case, and that Robinhood asked the U.S. Supreme Court to review the same ruling.
- September 2, 2026
New Jersey asks the Supreme Court to review the Kalshi ruling
New Jersey's Attorney General filed a petition asking the Supreme Court to decide whether prediction markets can offer sports contracts without following state sports-gambling laws. The Court has not yet said whether it will hear the case.
- August 28, 2026
Ninth Circuit rules for Nevada regulators in Kalshi case
In KalshiEX v. Assad, a three-judge panel found Kalshi had not shown that federal commodities law likely overrides Nevada gaming rules for its sports event contracts. It is a preliminary-stage ruling. Ninth Circuit rulings bind federal courts in California.
Source: U.S. Court of Appeals for the Ninth Circuit (opinion)
- August 13, 2026
Class action over DraftKings Predictions filed in California federal court
Event Horizon, quoting SBC Americas, reported a proposed class action alleging that DraftKings offers illegal sports betting through its prediction market product and seeking to block it in California.
- June 12, 2026
California Attorney General joins multistate brief against Kalshi
Attorney General Rob Bonta joined 37 other attorneys general in a Sixth Circuit brief supporting Ohio's authority to enforce its gambling laws against Kalshi. His office said it was the seventh such multistate brief California had joined.
- June 10, 2026
CFTC proposes a framework for sports and other event contracts
The CFTC published a proposed rule setting out how it would evaluate event contracts involving gaming and other listed activities, including contracts on sporting events. The proposal was opened for public comment and is not final.
- April 6, 2026
Third Circuit sides with Kalshi against New Jersey regulators
A divided Third Circuit panel upheld an injunction blocking New Jersey from enforcing its gambling laws against Kalshi's sports event contracts. The Ninth and Sixth Circuits later reached the opposite result.
Source: U.S. Court of Appeals for the Third Circuit (opinion)
- March 27, 2026
Governor Newsom extends insider-betting ban for state officials to prediction markets
An executive order extended existing bans on state officials profiting from inside knowledge so that they cover prediction markets. It applies to state officials and appointees, not to the platforms themselves.
- March 18, 2026
California lawmakers announce bill on prediction market ads to minors
CDC Gaming reported that Assemblymembers Mia Bonta and Pilar Schiavo announced a bill to bar fantasy sports and prediction market apps from advertising to minors or letting them use the services. It has not become law. The date shown is the report date.
- November 10, 2025
Federal judge denies California tribes' bid to block Kalshi on tribal lands
CDC Gaming reported that a federal district judge denied a preliminary injunction sought by three California tribes against Kalshi's sports event contracts on their lands. The Ninth Circuit partly reversed this ruling in September 2026.
- July 22, 2025
Three California tribes sue Kalshi and Robinhood
Event Horizon reported that the Blue Lake Rancheria, Chicken Ranch Rancheria and Picayune Rancheria sued in the Northern District of California, alleging that sports event contracts offered on their reservations violate the Indian Gaming Regulatory Act.
This is a factual summary, not legal advice.
California-specific guides
- California's November 2026 Ballot: All 14 Propositions and What Prediction Markets Actually Price
- LeBron James Signed With the 76ers: How the Biggest NBA Prediction Market of 2026 Got It Wrong
- Recap: World Cup 2026 Cinderellas: Morocco 2.35%, Switzerland 0.85%, Egypt 0.15%, Paraguay 0.05%
- Spain Won the 2026 World Cup: How the $3.88B Winner Market Priced the Final
- Recap: NBA Free Agency 2026 on Prediction Markets: Cavaliers 52%, Warriors 18.5%, Lakers 0.55%
- Super Bowl LXI at SoFi 2027: NFL 2026 Season Odds & California Trading Guide
- California 2026 Congressional Races on Prediction Markets: CA-22, CA-27, CA-41, CA-45, CA-47, CA-11
- Robinhood Prediction Markets in California: What to Know
- Is Sports Betting Legal in California? (2026 Guide)
Sources & further reading
Every figure and legal claim on this page traces back to a primary source. These are the ones we checked, open them and verify us.
- Commodity Exchange Act (7 U.S.C. § 1 et seq.)
The federal statute that platforms cite as overriding state gambling law for event contracts; courts are still deciding how far it reaches.
- California Secretary of State
Official source for California ballot measures, propositions, and certified election results.
- California Attorney General: gambling in California
The state's own summary of what is and isn't legal wagering in California.
- CFTC: Commodity Futures Trading Commission
The federal regulator that authorizes and supervises every event-contract exchange we cover.
- National Council on Problem Gambling
Free, confidential help and self-assessment tools (1-800-522-4700).
Frequently asked questions
Are prediction markets legal in California?
The platforms on this page accept California residents 21+. Kalshi, Polymarket US, ProphetX and OG run CFTC-regulated exchanges under federal commodities law. For sports contracts, whether state gambling law also applies is disputed: the Ninth Circuit, whose rulings cover California, ruled against Kalshi at the preliminary stage in August 2026. California's Attorney General has not sued the platforms but has joined multistate court briefs supporting other states.
Which platform is best for California residents?
Polymarket is our #1 overall pick for California traders: deepest live in-play book, CFTC-regulated. ProphetX is #2 and our top sports-first pick. Kalshi is #3, the broadest CFTC-regulated platform and best for politics. OG by Crypto.com is #4, with a Trade $25 Get $25 in Rewards! offer and broad device support. Rebet is #5 (travel-only for Californians) and Novig #6, available in California. Sleeper and Chalkboard are fantasy and pick'em apps, not CFTC-regulated exchanges.
Do I have to pay California state tax on prediction-market winnings?
Yes. Prediction-market profits are taxable at both the federal and California state levels. Kalshi provides a profit-and-loss statement for your trades; report your profit whether or not you get a form. See our prediction-market taxes guide for details.
Can I use Polymarket in California?
Available — dispute pending (as of October 3, 2026). Polymarket US is a CFTC-regulated app that opened to US users in December 2025, and it accepts California residents (Polymarket's minimum age is 18; we recommend 21+). The web version remains restricted in the US.
What is the difference between prediction markets and sports betting?
Prediction markets are CFTC-regulated event contracts that trade on federally regulated exchanges, while sports betting is regulated state by state and is not legal in California. Whether sports event contracts count as gambling under state law is now disputed: the Ninth Circuit ruled against Kalshi at the preliminary stage in August 2026, and Supreme Court petitions are pending.
Where can I follow upcoming California-relevant markets?
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18+ · T&Cs apply · Terms
Certain limitations apply. The offer is available to new users only, subject to the terms and conditions at kalshi.com/tc/500. 18+ only. Restrictions and eligibility requirements apply. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information.