Kalshi: Sports App or Financial Exchange? Billions at Stake

A fierce legal and regulatory battle is brewing over whether Kalshi, a federally regulated prediction market platform, should be classified as a sports gambling app. The outcome could determine billions of dollars in state tax revenue and fundamentally reshape the landscape of online betting in the United States, just as the 2026 World Cup drives record wagering volumes.

Kalshi, which launched in July 2021 after obtaining a license from the Commodity Futures Trading Commission (CFTC), argues it is a financial derivatives exchange — not a sportsbook. But with 80 to 90 percent of its activity tied to sports wagering and monthly volumes exceeding $30 billion during the World Cup, critics contend the platform is an unlicensed sportsbook operating through a legal loophole. More than 20 federal lawsuits are pending, and legal experts expect the question to eventually reach the U.S. Supreme Court.

The Core Dispute

At the heart of the matter is a fundamental question: Is Kalshi a novel financial product or simply gambling dressed in regulatory clothing? The company maintains that its peer-to-peer model, where bettors wager against each other rather than against “the house,” distinguishes it from traditional sportsbooks. Kalshi does not profit when users lose; instead, it charges a fee on every transaction.

“Just like the stock market, you can exit your position at any time. It’s a fairer, less predatory platform,” Kalshi spokeswoman Elisabeth Diana told NPR.

Critics, however, see little difference. “From a bettor’s standpoint, Kalshi and sportsbooks are basically identical,” said Victor Matheson, an economics professor at the College of the Holy Cross who specializes in sports gambling. “I don’t see why they should be regulated and taxed any differently than sportsbooks.”

David Forman, vice president of research at the American Gaming Association, put it more bluntly: “Kalshi is a sportsbook with a small prediction market business attached to it.”

The World Cup Effect

The 2026 World Cup has supercharged Kalshi’s growth. The platform has taken in approximately $40 billion in World Cup wagers, according to analytics firm Ticker Tracker. By comparison, analysts expect traditional online sportsbooks like DraftKings and FanDuel to log about $4 billion in bets across all 104 matches. Kalshi’s monthly trading volume reached $31 to $33 billion in June 2026 — a 70 percent month-over-month increase — and combined prediction market volumes exceeded $50 billion, as CNBC reported.

The Tax Revenue Question

The financial stakes extend well beyond the platforms themselves. State-licensed sportsbooks pay approximately $4 billion per year in taxes, with rates ranging from 6.7 percent in Nevada to 51 percent in New York. These taxes fund public education, water preservation programs, and infrastructure projects. Kalshi, by contrast, pays none of these state gaming taxes.

The American Gaming Association estimates that prediction markets have cost states $1 billion in lost tax revenue — a figure that Kalshi disputes but that experts say underscores the scale of the issue. “Prediction markets circumventing state gambling taxes — even if, to a customer, the product is indistinguishable from sports betting — was bound to get a reaction from state governments that feel cheated,” Danny Funt, author of “Everybody Loses: The Tumultuous Rise of American Sports Gambling,” told NPR.

North Carolina recently became the first state to tax prediction markets, imposing a 6 percent rate compared to 23 percent for online sportsbooks. Kalshi has signaled openness to more such arrangements, with Diana stating: “We comply with all corporate tax laws and believe in responsible state taxation, even as a federally regulated derivatives exchange.”

A Patchwork of Legal Challenges

States have not waited for Congress to act. Arizona filed the first criminal charges against Kalshi in March 2026 — 20 misdemeanor counts alleging illegal gambling operations, as NPR reported. A federal judge temporarily paused the prosecution, but the case marked a significant escalation.

Other states have pursued their own actions. Massachusetts secured a preliminary injunction requiring Kalshi to geofence sports betting. Michigan obtained a temporary restraining order. Minnesota enacted the first outright state ban on prediction markets, effective August 1, though the Department of Justice immediately sued to block it. Ohio, Nevada, Washington, Wisconsin, and New York have all filed lawsuits or obtained restraining orders.

The Trump Administration’s Role

The federal government has taken Kalshi’s side. Under President Trump, the CFTC has filed lawsuits against at least nine states — including Illinois, Arizona, and Connecticut — arguing that prediction markets fall under exclusive federal jurisdiction. CFTC Chairman Michael Selig said in a statement: “States cannot circumvent the clear directive of Congress.”

President Trump’s eldest son, Donald Trump Jr., serves as a strategic advisor to both Kalshi and Polymarket and holds equity in both companies, adding a political dimension to the regulatory battle.

Analysis: A Defining Moment for Prediction Markets

The Kalshi controversy represents a watershed moment for the rapidly growing prediction market industry. Valued at $22 billion as of May 2026, Kalshi has transformed from a niche financial experiment into a mainstream platform with partnerships at Robinhood, CNN, and CNBC. Its success has prompted even its critics — DraftKings and FanDuel — to launch their own prediction market services.

Yet the legal foundation remains precarious. A federal judge in Ohio ruled in March 2026 that Kalshi’s products constitute gambling under state law, a decision the company is appealing. The question of whether prediction markets are finance or gambling will likely reach the Supreme Court, and the answer could make or break an industry.

As Matheson observed: “If I were just some guy in a smokey back room of a bar doing what Kalshi and Polymarket are doing, I’d be in jail.”

What to Watch For

Several developments will shape the outcome. The Supreme Court may take up a case as early as its next term. The CFTC continues to fill its vacant commissioner seats, which could shift regulatory priorities. And a potential change in administration in 2028 could reverse the federal government’s embrace of prediction markets entirely.

For now, billions of dollars in tax revenue — and the future of online betting in America — hang in the balance.