Iowa Is Taking a Different Path on Prediction Markets: Tax Them, Don’t Ban Them

While a growing number of states have spent the past year fighting prediction markets in court and slapping platforms like Kalshi and Polymarket with cease-and-desist letters, Iowa just did something different. On April 1, 2026, the Iowa Senate passed Senate File 2470 by a staggering 45-1 vote, making it the first legislative chamber in the United States to pass a bill regulating — rather than banning — prediction markets. The move is a sharp departure from the enforcement-first approach adopted by more than ten other states, and it could signal a new direction in how America handles one of the fastest-growing corners of financial speculation.

The debate over prediction markets has escalated dramatically in recent months. Tennessee issued cease-and-desist orders to Kalshi, Polymarket, and Crypto.com. Arizona filed criminal charges — the first in the country — against Kalshi for offering sports-related event contracts without a state gambling license. Nevada obtained a court order temporarily shutting Kalshi down. Utah’s governor signed a bill outright banning proposition-style wagers including prediction markets. And Congress is now considering bipartisan legislation that would effectively ban CFTC-registered platforms from listing sports contracts at all. The overwhelming trend has been restriction. Iowa looked at all of that and decided the more productive question was not whether to let prediction markets operate — it was how to make sure the state got paid while they did.

What SF 2470 Actually Does — and What It Costs to Play

Senate File 2470, which began as SF 2085 when Sen. Mike Klimesh (R) introduced it to the Ways and Means Committee in January 2026, would create a comprehensive licensing and taxation framework for prediction market operators serving Iowa residents. The bill defines the platforms it covers as designated contract markets — digital marketplaces for trading event-driven contracts, which are federally regulated binary financial products tied to specific real-world outcomes. The bill covers sporting activities, elections, legislative actions, and economic indicators. Traditional sports betting, horse racing, and fantasy sports contests already licensed under Iowa law are explicitly excluded.

To operate legally in Iowa under SF 2470, a prediction market platform would be required to obtain a permit from the Iowa Department of Revenue. The initial application fee is set at $10 million — a steep price of entry that critics argue will concentrate the market among only the best-capitalized players. Annual renewal fees come in at $100,000, with permits expiring every June 30. The bill imposes a 20% tax on adjusted revenues generated from Iowa users, with all permit and tax revenue flowing into the state’s general fund.

The adjusted revenue calculation works like this: it starts with the total fees and premiums collected from all traders on a platform, subtracts the payouts made to winning traders, and then applies a formula to determine what portion of the net is attributable to Iowa-based users. This is functionally similar to the adjusted gross revenue framework used in most state sports betting tax regimes — essentially taxing the house’s take, not total handle. Beyond the platform-level charges, the bill also modifies how individual Iowa taxpayers treat prediction market earnings. Gains from event-driven contracts must be reported as Iowa taxable income, and platforms would be required to withhold state income taxes on payouts exceeding $600. Loss deductions are capped at 90% of gains for those who itemize.

One State Zigging While the Rest Zag

Iowa’s regulatory approach puts it in a genuinely unusual position on the national map. Across the country, more than ten states have issued cease-and-desist orders against Kalshi and its peers. Several have filed or threatened legal action. Utah’s governor signed a bill outright banning proposition-style wagers including prediction markets. Arizona became the first state to file criminal charges against a prediction market operator, with 20 misdemeanor counts leveled against Kalshi in March 2026. The pattern has been increasingly punitive: regulators treating these platforms as unlicensed gambling operations that need to be shut down, not structured into existing tax frameworks.

The argument from those states is straightforward. Tennessee’s Sports Wagering Council, which sent cease-and-desist letters to Kalshi, Polymarket, and Crypto.com in January 2026, argued that the platforms were running unlicensed sports wagering operations and posed an immediate and significant threat to the public interest. The council’s executive director noted that Tennessee’s 12 licensed sports betting operators generated taxes on more than $305 million in wagers in a single month, and that unregulated platforms were siphoning revenue away from both licensed operators and state coffers. If prediction markets look like sports betting and act like sports betting, the logic goes, they should be treated like sports betting — and that means getting a license or getting out.

Iowa’s lawmakers looked at the same set of facts and landed differently. Rather than treating the absence of a license as grounds for prohibition, they built a licensing structure from scratch. The 45-1 Senate vote suggests this was not a particularly controversial position once the framework was laid out. By creating a permit system with clear fees, taxes, and consumer protections, Iowa is betting that it can capture revenue from a fast-growing market while still giving the state meaningful oversight over how these platforms operate within its borders. Whether that approach survives the House — and survives the inevitable legal challenges — remains to be seen.

What This Means for the Industry and the People Who Use These Markets

For platforms like Kalshi and Polymarket, Iowa’s approach is a double-edged proposition. A regulatory framework — even an expensive one — is arguably preferable to the chaotic patchwork of cease-and-desist orders and court battles that have defined the past year. A state that says here are the rules, pay up and operate provides at least some predictability. On the other hand, the $10 million initial permit fee is not a small number. The Iowa Department of Revenue’s own fiscal note on the bill assumed only two platforms would enter the market and pay the fee in the first year. That tracks: only Kalshi and Polymarket hold enough market share to justify the cost. Smaller platforms and new entrants would likely find Iowa’s barrier to entry prohibitive, a concern raised by industry attorneys who warned that heavy fees will concentrate activity among larger, well-capitalized firms.

It is also worth noting that Kalshi preemptively sued Iowa’s attorney general on March 11, 2026 — before the Senate vote — arguing that the CFTC’s exclusive jurisdiction over derivatives markets preempts state regulation. That legal battle will continue regardless of whether SF 2470 becomes law, and it mirrors similar fights playing out in Nevada, Maryland, Ohio, and Arizona. The federal preemption question — whether CFTC registration shields these platforms from state gambling enforcement entirely — is the central unresolved issue in the industry, and no state legislature can settle it on its own.

For everyday users of prediction markets, Iowa’s bill represents a potential model where access is preserved under regulated conditions rather than cut off entirely. States that ban these platforms leave bettors with no legal option. States that regulate and tax them, as Iowa proposes, at least preserve a market — though platforms may pass some compliance costs on to users through wider spreads or reduced payouts. Whether other state legislatures follow Iowa’s lead will depend largely on how the courts rule in the coming months and whether the overwhelming 45-1 Senate vote translates into the same pragmatic consensus in the Iowa House.