Prediction Markets in South Dakota

The Deadwood Geofence Problem

When South Dakota voters approved a ballot measure in November 2020, they legalized sports betting. However, the enabling legislation (HB 4102) narrowly defined its scope, confining all state-licensed sports wagering—both in-person and mobile—to the town of Deadwood. For context, Deadwood has a population of roughly 1,200 people. Sioux Falls, the state's largest city, has a population of nearly 200,000.

This creates a "geofence" problem. A geofence is a virtual perimeter for a real-world geographic area. Mobile sports betting apps licensed by South Dakota are required to use location services to ensure a user is physically within the approved zone—in this case, the city of Deadwood. If you are a resident of Sioux Falls, you cannot legally place a bet on a state-licensed sportsbook app from your home. You would have to drive nearly six hours across the state to Deadwood to do so.

This restriction effectively disenfranchises the overwhelming majority of the state's population from participating in the mobile sports betting market, creating a significant demand for a legal, accessible alternative.

Status in South Dakota as of October 3, 2026

Platform	Status	Why (source)	Welcome offer in South Dakota
Kalshi	Available	Kalshi accepts South Dakota residents; no court ruling or state enforcement action on prediction markets in South Dakota was found in our legal timeline. (source (opens in a new tab))	Valid: Trade $25 and Get $25!
Polymarket US	Available	Polymarket US accepts South Dakota residents; no court ruling or state enforcement action on prediction markets in South Dakota was found in our legal timeline. (source (opens in a new tab))	Valid: Deposit $10 get a $25 Trading Bonus!
ProphetX	Available	ProphetX accepts South Dakota residents; no court ruling or state enforcement action on prediction markets in South Dakota was found in our legal timeline. (source (opens in a new tab))	Valid: Trade $50, Earn $75!
OG (by Crypto.com)	Available	OG accepts South Dakota residents; no court ruling or state enforcement action on prediction markets in South Dakota was found in our legal timeline. (source (opens in a new tab))	Valid: Trade $25 Get $50 in Rewards! (New users only)
Novig	Available	Novig accepts South Dakota residents; no court ruling or state enforcement action on prediction markets in South Dakota was found in our legal timeline. (source (opens in a new tab))	Valid: Deposit $10 Get $50 in Trade Credits!
Rebet	Available	Rebet is a sweepstakes app, not a CFTC-regulated exchange; its sweepstakes rules include South Dakota. (source (opens in a new tab))	Valid: Get a 100% purchase match up to $100!

What changed (newest first)

• Sep 25, 2026 (federal) — Sixth Circuit rules against Kalshi in Ohio and Tennessee appeals. Source: U.S. Court of Appeals for the Sixth Circuit (opinion, Nos. 26-3196/26-5235) (opens in a new tab)
• Sep 11, 2026 (federal) — Crypto.com asks Supreme Court to review Ninth Circuit ruling (No. 26-344). Source: Supreme Court of the United States, docket No. 26-344 (opens in a new tab)
• Sep 10, 2026 (federal) — Kalshi seeks Ninth Circuit rehearing; Robinhood petitions Supreme Court. Source: Sports Betting Dime (opens in a new tab)
• Sep 2, 2026 (federal) — New Jersey asks U.S. Supreme Court to review Kalshi preemption ruling. Source: New Jersey Office of the Attorney General (opens in a new tab)
• Aug 28, 2026 (federal) — Ninth Circuit rules for Nevada regulators in Kalshi case. Source: U.S. Court of Appeals for the Ninth Circuit (opinion, No. 25-7516) (opens in a new tab)
• Apr 6, 2026 (federal) — Third Circuit sides with Kalshi against New Jersey regulators. Source: U.S. Court of Appeals for the Third Circuit (opinion, No. 25-1922) (opens in a new tab)

_No South Dakota-specific entry is in the legal timeline; the list shows the federal rulings and Supreme Court petitions that shape the national picture._

What You Can Trade

The scope of markets available on these platforms is extensive and caters to a wide variety of interests, including the high sports interest in South Dakota.

* Sports: While direct betting on a team to win is often structured differently, you can trade on sports-related outcomes. Examples include: "Will an NFL team score over 40.5 points in Week 10?" or "Will a specific player achieve a statistical milestone?" Given the 13 South Dakotans on Super Bowl rosters in recent years and the strong regional interest in college football (especially Wyoming and neighboring teams), these markets are a popular mobile sports betting South Dakota alternative. * Politics: Trade on the outcomes of elections, legislative actions, and political appointments. Markets could include "Who will win the 2028 Presidential Election?" or "Will a specific bill pass Congress by June 30th?" * Economics & Finance: These are core markets for platforms like Kalshi. You can trade on whether the Federal Reserve will raise interest rates, the monthly inflation rate, GDP growth figures, and more. * Weather & Climate: Trade on tangible, verifiable events like "Will the temperature in Rapid City exceed 95°F this week?" or "Will the Missouri River water level at Pierre reach a certain height?"

Tax and Compliance for South Dakota

South Dakota is one of the few states with no state income tax. This presents a significant advantage for residents participating in prediction markets. Any net profits you earn from trading on platforms like Kalshi or Polymarket US are not subject to state-level income tax.

However, it is crucial to remember that these earnings are still subject to federal income tax. The IRS↗ (opens in a new tab) treats gains from these activities as income, and you are required to report them on your federal tax return. Platforms provide statements of your activity (Kalshi: a profit-and-loss statement), but you report your profit either way. As with any financial activity, it is highly recommended to consult with a qualified tax professional to ensure full compliance with federal law.

What could change the status

Dates we are watching: Nevada's responses to the Robinhood and Crypto.com Supreme Court petitions are now due November 13 and 16, 2026 (both extended in October), and Kalshi's response to New Jersey's petition is due November 9, 2026 (deadlines can be extended); the earliest the Supreme Court could act on the petitions is a conference in December 2026 or January 2027 (our estimate, not a scheduled date). We re-check this page when any of these happen and log the change above.

Best Platforms Compared

Prediction markets in other states

• Alaska
• California
• Colorado
• Connecticut
• Florida
• Hawaii
• Illinois
• Kansas
• Maryland
• Massachusetts
• Minnesota
• Nebraska
• New Hampshire
• New Jersey
• New York
• North Dakota
• Oregon
• Pennsylvania
• Rhode Island
• Texas
• Utah
• Vermont
• Virginia
• Washington
• Wyoming
• Alabama
• Arizona
• Arkansas
• Delaware
• Georgia
• Idaho
• Indiana
• Iowa
• Kentucky
• Louisiana
• Maine
• Michigan
• Mississippi
• Missouri
• Montana
• Nevada
• New Mexico
• North Carolina
• Ohio
• Oklahoma
• Puerto Rico
• South Carolina
• South Dakota
• Tennessee
• Washington DC
• West Virginia
• Wisconsin

§ References & Sources

1. Commodity Futures Trading Commission (CFTC) (opens in a new tab)— U.S. federal regulator
2. CFTC Designated Contract Markets list (opens in a new tab)— CFTC
3. 26 U.S. Code § 1256 — Section 1256 contracts marked to market (opens in a new tab)— Cornell Law / U.S. Code
4. IRS Form 6781 — Gains and Losses From Section 1256 Contracts (opens in a new tab)— Internal Revenue Service
5. National Council on Problem Gambling — 1-800-GAMBLER (opens in a new tab)— NCPG

Frequently asked questions

Are prediction markets legal in South Dakota?

We don't give legal verdicts, but here is the status as of October 3, 2026: Kalshi, Polymarket US, ProphetX, OG and Novig: Available. No court ruling or state enforcement action on prediction markets in South Dakota was found in the legal timeline (absence is not proof). Nationally, federal appeals courts are split on sports event contracts, all at the preliminary-injunction stage, and three Supreme Court petitions are pending; none has been granted.

Can I use Kalshi in South Dakota?

Status as of October 3, 2026: Available. Kalshi accepts South Dakota residents; no court ruling or state enforcement action on prediction markets in South Dakota was found in our legal timeline. Kalshi's welcome offer (Trade $25 and Get $25!) applies to South Dakota residents. Kalshi's minimum age is 18; we recommend 21+.

Has South Dakota taken action against prediction markets?

Our legal timeline has no court ruling or state enforcement action on prediction markets in South Dakota (that is not proof none exists). No federal appeals court covering South Dakota has ruled on sports event contracts.

What could change the status in South Dakota?

Dates we are watching: Nevada's responses to the Robinhood and Crypto.com Supreme Court petitions are now due November 13 and 16, 2026 (both extended in October), and Kalshi's response to New Jersey's petition is due November 9, 2026 (deadlines can be extended); the earliest the Supreme Court could act on the petitions is a conference in December 2026 or January 2027 (our estimate, not a scheduled date). We re-check this page when any of these happen and log the change above.