If Event Contracts Become Swaps, What Happens to Your Taxes? The CFTC's 2026 Proposal

Nothing about your taxes changes today. The CFTC's October 2026 proposal to define event contracts as swaps is a proposed rule under commodities law, and the CFTC itself says federal tax treatment is determined under the Internal Revenue Code and IRS guidance. The real effect is indirect: if event contracts are swaps, the case for Section 1256 treatment gets weaker, because that section excludes swap-type agreements. Tax classification stays unsettled.

OddsFile is software, not tax advice. The IRS has not issued guidance on how prediction-market contracts are taxed. This article explains the options and the sources behind them; a tax professional can tell you which position fits your situation.

What the CFTC proposed

The notice, "Further Definition of 'Swap'—Inclusions" (RIN 3038-AF82), was published in the Federal Register on October 19, 2026. Comments are due by November 18, 2026.

The proposal text would add a new paragraph to the swap definition in CFTC Regulation 1.3:

"Event contracts, including those based on sports-, politics-, cultural, and weather-related events."

A companion interim final rule says the swap definition doesn't cover casino-style gambling, including sportsbook wagers and casino games.

It's a proposal. It can change, and it may be challenged.

The sentence that matters for taxes

The proposal states:

"The classifications proposed here are for purposes of the Commodity Exchange Act. Federal tax treatment and associated information reporting, withholding, registration, and payment obligations are determined under the Internal Revenue Code and applicable Treasury regulations and IRS guidance."

So the CFTC is saying plainly that it isn't deciding your tax treatment. Even a final rule wouldn't bind the IRS. A tax definition can differ from a regulatory one.

Effect on each treatment

Section 1256

The Section 1256 argument was always hard. The statute requires a qualifying contract type, and a regulated futures contract needs a mark-to-market deposit system. Section 1256(b)(2) then lists swap-type exclusions. An event contract isn't on the named list, so the fight would be over "similar agreement." But a trader claiming 60/40 now faces a federal regulator calling the same contract a swap.

If you've been leaning on 60/40, this is a good moment to reread Section 1256 and prediction markets with your preparer.

Would swap tax rules apply?

Tax law has no general rule called "swap." It has rules for notional principal contracts. Treas. Reg. §1.446-3 defines one as a financial instrument providing for payments at specified intervals, calculated by reference to a specified index on a notional principal amount, in exchange for specified consideration or a promise to pay similar amounts.

An event contract is a poor fit. It usually has one payment at the end, not payments at intervals, and $1-or-$0 settlement doesn't look like an index on a notional amount. The regulation also excludes options and forwards, and an event contract can look like one of those. So we would not assume that the notional principal contract rules apply. That is our reading. We found no IRS or court statement on it.

Capital or ordinary?

If a contract were treated as a derivative of some kind, whether its gain is capital could turn on Section 1234A, which covers termination of certain rights with respect to capital assets, and on how a contract settles. These questions were already open before this proposal.

Gambling

The proposal's reasoning is that event contracts are CFTC-regulated, not casino-style wagers. That helps someone arguing they didn't make a wager. But Section 165(d) doesn't define "wagering transaction" by reference to the Commodity Exchange Act, and a court could still see a bet on a game as a wager for tax purposes.

State tax and state gambling law

The proposal aims at federal jurisdiction, and it relates to live disputes with states. Those affect whether a venue can operate. They don't set your state income tax. See the Illinois prediction market tax for how a related state fight plays out.

Forms

A swap label doesn't automatically create a tax form. Information reporting is set by the tax code and Treasury. The CFTC sentence quoted above says as much for reporting and withholding. So don't expect a new form because of this rule alone.

What to do

• Don't change your 2026 approach because of a proposal. File based on the law as it stands when you file.
• Don't claim 60/40 without a fresh review if you were relying on regulated-exchange status.
• Write your reasoning down. Note what was pending when you filed, in case a later rule lands.
• Watch for IRS guidance. That's what would change your return, and we've found none as of October 31, 2026.
• Check the final rule before filing if it arrives in time, along with any court challenge.

Your raw data matters more than the label. Per-market P&L, gross figures and dates carry over to any treatment, so build that now. Run the free OddsFile check: paste a Polymarket or Hyperliquid address and see your 2026 P&L under each treatment, no signup.

For the wider map, read are prediction market winnings taxable?

FAQ

Does this mean prediction markets aren't gambling?

For CFTC purposes, the proposal treats event contracts as swaps, not casino-style wagers. It doesn't answer the income tax question.

Do I owe tax differently on my Kalshi contracts now?

No. It's a proposed rule, and the CFTC says it doesn't determine tax.

Does it cover Polymarket?

The proposed definition is general. How it applies to any venue depends on CFTC jurisdiction, which is a separate question from tax.

Could the IRS follow the CFTC?

It could, but nothing requires it to, and we've seen no statement from the IRS on this.