Kalshi and prediction markets in Iowa: taxes and legal status

Iowa's flat income tax rate is 3.8%. The 2025 expanded instructions and the Tax Foundation's 2026 table both show this rate.

Iowa taxes short-term trading gains as ordinary income at the flat rate.

Iowa lets you deduct gambling losses only if you itemize, and only up to your winnings. If you take the standard deduction, you cannot deduct losses but you still report winnings. Iowa starts from federal taxable income, so the federal Schedule A figure carries over.

• Iowa taxes gambling winnings in full, even for nonresidents. Residents report winnings as other income on the IA 1040. Nonresidents must file if Iowa-source income is $1,000 or more and total income is over $9,000 (single) or $13,500 (married). Winnings at Iowa tribal casinos are exempt from Iowa withholding.
• Iowa starts from federal taxable income, so your federal choice of standard or itemized deductions carries to Iowa.
• Iowa withholds on prizes over $600, including multistate lottery tickets bought in Iowa. Thresholds are over $600 for prizes, over $1,000 for parimutuel winnings and over $1,200 for slot machines. Noncash prizes over $600 are withheld at 3.8%. Federal withholding applies above $5,000.
• It is unclear whether Iowa follows the federal 90% gambling-loss limit from 2026, though it starts from federal taxable income and follows federal tax law changes automatically.

As of October 27, 2026, no court order stops Kalshi in Iowa or protects it. A federal judge in Des Moines refused on September 8, 2026 to bar Iowa officials from enforcing state gambling law against Kalshi, and Kalshi has appealed to the Eighth Circuit. Iowa hasn't filed an enforcement action against Kalshi.

States say prediction market sports contracts are bets that their gambling laws cover, while Kalshi and the CFTC say they are swaps, a kind of derivative that only the federal Commodity Exchange Act and the CFTC regulate. The Third Circuit appeals court sided with Kalshi against New Jersey in April 2026, while the Ninth Circuit (Nevada, August 2026) and the Sixth Circuit (Ohio and Tennessee, September 2026) ruled for the states, all at the preliminary stage. The Fourth Circuit (Maryland) heard argument in May 2026 and had not ruled as of October 27. New Jersey's petition to the Supreme Court, Flaherty v. KalshiEX (No. 26-299), is waiting on Kalshi's response due November 9, 2026, and the Court has not yet said whether it will hear the case. On October 9, 2026 the CFTC proposed a rule defining event contracts as swaps.

The IRS hasn’t said how prediction market trades are taxed, so you pick one of four federal methods: capital gains, ordinary income, gambling or Section 1256. Iowa starts from your federal figures, so the method you choose federally generally carries onto your state return. If you report as gambling, the loss rules above apply. The four methods, compared.

The court cases are about whether Iowa can license or stop the platforms. None of them decides how your trades are taxed. Trades you already made, including positions an order made you close, still count in your tax year.