When the Supreme Court struck down PASPA in May 2018, making it possible for US states to legalise sports betting, the arguments made by both proponents and critics were vivid and confident. Proponents predicted a major economic windfall for states through tax revenue and tourism, the elimination of the illegal market, and a new engagement mechanism for sports fans. Critics warned of dramatic increases in problem gambling, the corruption of sport, and the exploitation of vulnerable populations. Five years into the large-scale US legalisation experiment, the data is rich enough to evaluate these predictions with some precision — and the reality is more complicated than either side predicted.
What the Revenue Numbers Actually Show
State tax revenue from sports betting has been significant but lower than the most optimistic projections. The states that moved fastest to legalise — New Jersey, Pennsylvania, Illinois, Colorado — have generated hundreds of millions in annual tax revenue, providing genuine fiscal benefit that has funded state programmes in several states. The aggregate revenue across all legalised states exceeds $3 billion annually as of 2025. These are real numbers with real fiscal impact, though they fall short of the projections used to build political support for legalisation in several states.
The reason revenues have been lower than some projections is that operator economics have compressed the tax base. The aggressive promotional spending — large sign-up bonuses, risk-free bets, deposit matches — that operators deployed to acquire users in newly opened markets is typically deductible from taxable gross gaming revenue in most state frameworks. In the first years after market opening, promotional spending effectively reduced operator net revenue — and therefore the tax base — significantly. As markets mature and promotional spending moderates, the tax base expands, but the early-year projections that assumed full handle-based revenue were significantly overstated.
The elimination of the illegal market — one of the primary policy arguments for legalisation — has occurred partially but not completely. Legal channels have captured a large majority of the sports betting that now occurs in the US, but the illegal market has not disappeared. Its persistence is concentrated among: bettors who exceed legal operator credit limits and turn to illegal books for higher stakes; recreational bettors who maintain existing illegal market relationships from before legalisation; and markets that operators find commercially unattractive to price competitively (very low-profile leagues, specific exotic bet types).
The Problem Gambling Debate
The most contested empirical question about US sports betting legalisation is its impact on problem gambling rates. Prior to legalisation, research predicted significant increases in problem gambling prevalence. The empirical evidence from states with several years of legal betting data is more ambiguous than these predictions suggested. Several state surveys have found no statistically significant increase in problem gambling prevalence following legalisation. Others have found modest increases concentrated in specific demographic segments.
The picture is complicated by several methodological challenges: problem gambling prevalence surveys have significant measurement error; baseline rates before legalisation were poorly established in many states; the counterfactual — what would have happened to illegal market betting if legalisation had not occurred — is unknowable; and the effect of legalisation on gambling-related harm may operate with time lags that the available data does not yet capture. The honest answer is that the problem gambling impact of US sports betting legalisation is genuinely uncertain, with some evidence suggesting modest increases in help-seeking behaviour that may reflect either increased problem gambling or improved awareness and access to support services.
The League Revenue Transformation
For professional sports leagues, the impact of legal betting has been significant and largely positive from a commercial perspective. Betting engagement has measurably increased broadcast viewership — bettors watch significantly more game content than non-bettors and engage more deeply with secondary content related to events on which they have wagered. The leagues that negotiated commercial relationships with sportsbook operators — official data feeds, official odds providers, marketing partnerships — have generated new revenue streams that were not available before legalisation. The NFL, NBA, MLB, and NHL have all incorporated betting-adjacent content into their media products in ways that reflect the changed relationship between betting and league commercial strategy since PASPA.
What the Next Five Years Look Like
The US sports betting market in 2026 is entering a maturation phase after the rapid growth of the 2018-2023 expansion period. New state openings — the remaining unlegalised states — represent smaller addressable markets than the large states that opened earlier, reducing the growth rate driven by geographic expansion. Operator consolidation is continuing, with the major operators investing in product differentiation and customer lifetime value optimisation rather than new market acquisition. The regulatory framework is becoming more sophisticated, with several states tightening advertising restrictions, responsible gambling requirements, and data sharing obligations. The next five years will be defined less by market growth than by the quality of the regulatory and product frameworks that govern a large, now-established sector — with significant implications for consumer protection outcomes that will determine the long-term political sustainability of legal sports betting in the US.
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