US Sports Betting Growth Halts as Prediction Markets Siphon Billions
Washington, Saturday, 5 September 2026.
Legal NFL sports betting will stall at $29.5 billion this season. Unregulated prediction markets have diverted $1.3 billion in tax revenue while attracting over $5 billion from underage gamblers.
Market Maturation and Revenue Plateau
The American Gaming Association (AGA) released projections on September 4, 2026, indicating that U.S. domestic sportsbooks are expected to collect $29.5 billion in wagers during the 2026 NFL season [1]. This figure represents a nominal year-over-year increase from the $29.4 billion handle recorded in the previous season, signaling a significant deceleration in market growth [1]. The calculated growth rate stands at approximately 0.34 percent, highlighting a shift from aggressive expansion to market maturity across established state jurisdictions [1]. This stagnation suggests that major operators like DraftKings and FanDuel may pivot strategies from customer acquisition toward profitability and revenue optimization ahead of the new football season [1].
Prediction Markets and Regulatory Gaps
A primary factor contributing to this stall is the rapid expansion of unregulated prediction markets, such as Kalshi and Polymarket, which operate outside standard regulatory frameworks [1]. These platforms are active across all 50 states and Washington, D.C., bypassing laws in the 11 states that have not legalized sports betting and avoiding compliance in the 40 jurisdictions where it is legal [1]. The AGA estimates that these prediction markets have siphoned more than $1.3 billion in potential state gaming tax revenue since 2025 [1]. While the legal, regulated gaming industry generates roughly $18 billion annually in sports betting tax revenue for community projects, the rise of these backdoor betting options poses a challenge to state coffers [1].
Consumer Protection and Economic Impact
Concerns regarding consumer protection have intensified, particularly regarding underage participation in these unregulated markets [1]. Sports bets constitute about 80% of Kalshi’s volume, including an estimated $5.1 billion in volume from users between the ages of 18 and 20, which is below the legal age in 35 of the 40 jurisdictions where sports betting is legal [1]. AGA President and CEO Bill Miller warned that these platforms misleadingly market sports wagers as investments rather than entertainment, lacking the oversight and accountability of the legal market [1]. As the NFL season kicks off, the AGA urges fans to distinguish between licensed sportsbooks and prediction markets to ensure wagering occurs within state- and tribal-regulated environments [1].