Are Prediction Market Winnings Taxable? Yes, Even Without a 1099

TL;DR

• Any gain you realize trading a Yes or No contract on Kalshi, Polymarket, Limitless, Predict.Fun, or Opinion is taxable US income, whether or not a tax form ever shows up.
• No platform in this group, Kalshi included, issues a form covering your event-contract trading gains and losses. Kalshi's identity verification only produces a 1099-INT for interest and a 1099-MISC for rewards, neither of which touches your trading P&L.
• The IRS has not ruled on whether event-contract gains count as ordinary income or capital gains. That classification question is still open and depends on your specific trading pattern.
• Track your own entry price, exit price or resolution value, and transaction date for every closed position. No platform will reconstruct that for you.

Just closed out a winning contract on Kalshi or Polymarket and wondering whether the IRS gets a cut? It does, and that's true even if nothing shows up in your inbox come tax season.

Any gain you realize trading event contracts on Polymarket, Kalshi, Limitless, Predict.Fun, or Opinion is taxable income in the US. That obligation exists no matter which of the five platforms you used, and, this is the part that surprises people, no matter whether a tax form arrives. Not even Kalshi, the one CFTC-regulated exchange in the group, sends you a form covering your trading gains.

This is the part most explainers get backwards. They either treat a missing 1099 as a missing tax obligation, or assume Kalshi's identity verification means it reports your profit and loss the way a stock brokerage does. Neither is right. The trigger for tax liability is the gain itself. Identity verification alone doesn't produce a tax form for trading activity, it just makes a narrower kind of form possible.

Why Do Some Platforms Send Tax Forms and Others Don't?

Kalshi is a CFTC-regulated exchange. It verifies identity at signup, the same way a stock brokerage does, and that verification is what makes any tax reporting possible at all.

But per Kalshi's own Help Center, that verification produces two specific forms, not a general one. A 1099-INT arrives if you earn $10 or more in interest on your cash balance. A 1099-MISC arrives if credits or rewards, referral bonuses mostly, total $600 or more. Kalshi can also issue a 1099-B or 1099-DA, but only for limited digital-asset transfer activity, not for the gains and losses on your actual event-contract trades.

In other words, Kalshi's KYC buys it two narrow forms that have nothing to do with whether your Yes contract paid off. There is no comprehensive form covering contract-level trading P&L on Kalshi, any more than there is on the other four platforms.

Polymarket, Limitless, Predict.Fun, and Opinion don't have that identity-verification infrastructure at all. They run on crypto rails, settle through wallets rather than bank accounts, and, in Polymarket's case, restrict US retail access directly because it isn't a CFTC-regulated exchange. A platform that never confirms who you are can't issue any tax form, not even the narrow interest and rewards ones Kalshi manages.

So the real gap isn't "Kalshi reports, the other four don't." It's that Kalshi's KYC produces two forms unrelated to your trading gains, while the other four produce nothing at all. On the one question that actually matters, whether you owe tax on a winning position, every platform leaves the answer to you.

Does No Tax Form Mean No Tax Obligation?

Here's the durable fact that survives every platform change and every regulatory update: according to the IRS, all income is taxable unless the law specifically excludes it, regardless of whether you received an information return for it.

A missing 1099, or a 1099 that only covers interest and referral bonuses, doesn't erase a trading gain. It just means the IRS is relying on you, not a third party, to disclose it.

This is the same principle that applies to cash tips, freelance income under the reporting threshold, or gains from a private stock sale. The absence of a form has never been a legal shield. It just changes who carries the documentation burden.

If you trade event contracts on any of these five platforms, that burden sits with you: track your own cost basis, your own realized gains, your own losses. Kalshi does provide a running profit-and-loss statement in its app, useful for reconstructing your own numbers, but the platform is explicit that the statement isn't tax advice and doesn't substitute for your own records.

How Do Event Contracts Fit Into the Tax Code?

A Yes contract pays $1 if the event resolves correctly and $0 if it doesn't. The two sides of a binary market sum to roughly $1.00 before fees. That structure means every position you close, whether you sell early or hold to resolution, produces a realized gain or loss the moment it settles.

Say you buy a Yes contract at $0.40 and sell it at $0.70 before resolution. That $0.30 difference is a realized gain, taxable in the year you sold, regardless of whether the underlying event has happened yet.

Say instead you hold to resolution and the contract pays out at $1.00. Your gain is the difference between what you paid and what you received. Either way, the tax event is triggered by the transaction, not by whether the platform tracked it for you.

How that gain gets classified, ordinary income versus capital gains, is where things get genuinely unsettled, and it's also where this article stops. The IRS has not issued clear, contract-specific guidance for event contracts the way it has for securities or even for regulated futures. Some tax preparers have floated Section 1256's 60/40 capital-gains treatment, the same rule used for regulated futures, but without an IRS ruling confirming event contracts qualify, that position is considered aggressive rather than settled.

That's a real gap, and it's exactly the kind of question that depends on your specific trading pattern, your holding period, and your broader tax situation. This is informational, not individualized advice. Talk to a tax professional who can look at your actual activity.

What's the Practical Tax-Form Difference Between Platforms?

The pattern holds across all five platforms, Kalshi included: none of them issues a form covering event-contract trading gains and losses. Kalshi's KYC produces two forms addressing interest and rewards, nothing more. The self-reporting obligation for your actual trading P&L falls on you everywhere.

Our Kalshi vs. Polymarket comparison covers where the two diverge beyond tax reporting, on custody, regulation, and dispute handling.

Why Does This Matter More as Prediction Markets Grow?

Cross-platform trading is becoming normal. A trader who compares odds across Polymarket, Kalshi, Limitless, Predict.Fun, and Opinion for the same event, which is the entire premise of using an aggregator, ends up with a tax record scattered across five platforms.

None of them documents your trading gains for you, Kalshi included. Consolidating your own trade history, entry price, exit price, and dates, becomes a personal responsibility rather than something you can outsource to a January email from a broker.

Sources

• IRS. "Publication 525, Taxable and Nontaxable Income." irs.gov
• Kalshi Help Center. "What Tax Documentation Does Kalshi Provide?" help.kalshi.com
• Camuso CPA. "Kalshi Tax Reporting: What Your 1099 Leaves Out." camusocpa.com
• Camuso CPA. "Section 1256 and Prediction Markets: Do Kalshi and Event Contracts Qualify?" camusocpa.com

PredictionHero aggregates publicly available prediction market data for informational purposes only. This is not financial advice. Prediction markets may not be available in all jurisdictions.