Polymarket Taxes 2026: How to Report Winnings With No 1099
Polymarket winnings are taxable income in the United States, even though Polymarket sends you no 1099 and reports nothing to the IRS. The absence of a form does not remove the obligation — it just moves the entire burden of tracking, valuing and reporting onto you. That is the single most important thing to understand before you file: no paperwork from the platform is not the same as no tax.
This is general information, not tax advice. The tax treatment of prediction markets is genuinely unsettled — the IRS has issued no guidance specific to event contracts. Consult a qualified tax professional before you file.
What follows is a data-first walkthrough of how these gains are most commonly reported in the 2026 tax year, why two reasonable professionals can reach two different answers, the One Big Beautiful Bill Act change that raises the cost of being treated as a gambler, and how to rebuild the transaction history Polymarket never gives you. Every form line and rate below was checked against current professional guidance and IRS form structure as of June 2026.
Are Polymarket Winnings Taxable?
Yes. Polymarket winnings are taxable. US tax law requires you to report income from all sources unless a specific provision excludes it — and no provision excludes prediction-market gains. There is no minimum threshold below which a profit becomes invisible, no exemption for crypto-denominated gains, and no carve-out for offshore platforms.
The confusion comes from a reasonable but wrong assumption: that if no third party files a form on your behalf, the income wasn't reported and therefore isn't owed. The 1099 is an information return — a copy the IRS receives so it can cross-check your return. Its absence changes what the IRS automatically knows. It does not change what you owe. So the practical question is not whether you owe tax. It's which framework you use to calculate it, and how you document a profit-and-loss record the platform won't hand you.
Why Polymarket Doesn't Send You a 1099
Polymarket doesn't send a 1099 because the entity most US traders interact with — Polymarket International — operates offshore and outside the US information-reporting regime that obligates domestic brokers and casinos to file. Settlement happens on the Polygon blockchain in stablecoins, not through a US bank or broker that would trigger a 1099-B, 1099-MISC or W-2G. There is no custodial intermediary cutting you a check and copying the IRS.
That architecture is exactly why the reporting burden lands entirely on the trader. A US brokerage tracks your cost basis, proceeds and holding period, then mails you a tidy summary. Polymarket tracks none of that for tax purposes. Your "statement" is the blockchain: a public, permanent ledger of every buy, sell and resolution — but one denominated in USDC, timestamped in block time, and indifferent to your filing deadline.
"No 1099" Does Not Mean "No Tax"
This is the line that trips up the most people, so it's worth stating bluntly: a missing 1099 is a missing information return, not a missing obligation. The IRS expects you to self-report income it has no automatic record of. Doing so is the default legal posture; not doing so is underreporting. The fact that enforcement is harder when there's no form does not make the income tax-free — it makes accurate self-documentation more important, not less, because you have no third-party paper trail to fall back on if you're ever asked to substantiate your numbers.
How the IRS Treats Prediction-Market Gains (and Why It's Unsettled)
The honest answer is that the IRS has not said. There is no ruling, no published guidance and no regulation that tells you, definitively, how a Polymarket profit should be classified. Into that vacuum, tax professionals have advanced two main positions — and a third, weaker one that mostly doesn't apply to Polymarket. The choice between them materially changes what you pay, especially in a losing or break-even year.
Capital Gains Treatment
The most common position among crypto and prediction-market CPAs is to treat each Polymarket position as a capital asset: you buy shares of an outcome, you sell or redeem them, and the difference between proceeds and cost basis is a capital gain or loss. Under this approach you report each disposition on Form 8949, the totals flow to Schedule D, and the net result lands on the capital-gains line of your Form 1040.
Because nearly every prediction-market position resolves in well under a year, the gains are almost always short-term, which means they're taxed at your ordinary income rate — the 10% to 37% federal brackets, depending on total income. The advantage of this framework isn't the rate; it's the loss mechanics. Capital losses net directly against capital gains, and net losses can offset up to a set amount of ordinary income with the remainder carried forward to future years. That symmetry is why most professionals describe capital-gains treatment as the more favorable default.
Gambling-Income Treatment
The alternative treatment argues that betting on a binary event outcome is functionally gambling, and should follow gambling tax rules. Under this view, your winning positions are reported as ordinary income — commonly on Schedule 1, line 8z ("Other income") — and your losing positions become an itemized deduction on Schedule A, line 16, deductible only up to the amount of your winnings, and only if you itemize at all.
This framework is structurally worse for most traders for three reasons. First, you can't net wins against losses before reporting — gross winnings go on top of your income. Second, the loss deduction is useless if you take the standard deduction. Third, beginning in the 2026 tax year, that loss deduction is capped at 90% of winnings (more on this below). A professional gambler — someone who trades as a trade or business — may instead use Schedule C, where losses and expenses offset winnings without itemizing, but the same overall limits still apply.
Why the Section 1256 "60/40" Argument Is Weak Here
There's a third theory you'll see floated: that prediction-market contracts qualify as Section 1256 contracts, which receive a favorable 60/40 split — 60% taxed as long-term, 40% as short-term, regardless of holding period. The catch is that Section 1256 treatment generally hinges on a contract trading on a CFTC-regulated exchange. That argument has at least a foothold for Kalshi, which is a CFTC-regulated designated contract market. It has very little footing for Polymarket, which operates offshore on Polygon and is not a CFTC exchange in the same sense. The IRS has never blessed the Section 1256 approach for event contracts at all, and applying it to an unregulated offshore venue is the weakest version of an already-untested argument. Most professionals treat it as off the table for Polymarket specifically.
Capital Gains vs. Gambling: The Difference That Actually Matters
| Capital Gains Treatment | Gambling-Income Treatment | |
|---|---|---|
| Where it's reported | Form 8949 → Schedule D → Form 1040 | Winnings: Schedule 1, line 8z. Losses: Schedule A, line 16 (or Schedule C if a professional) |
| Tax rate on gains | Short-term = ordinary rates (10%–37%); long-term rare but preferential | Ordinary income rates (10%–37%) |
| Can losses net against wins? | Yes — losses offset gains directly | No — gross winnings reported; losses are a separate deduction |
| Losses if you take the standard deduction | Still usable (net against gains) | Lost entirely — deduction requires itemizing |
| Excess losses | Carry forward to future years | No carryforward |
| 2026 loss-deduction cap | Not subject to the 90% gambling cap | Capped at 90% of winnings (OBBBA) |
| Status | Most common professional position | The alternative, generally less favorable |
The table makes the stakes concrete: in a break-even or losing year, the two frameworks can produce wildly different tax bills, and the gambling framework can make you owe tax on income you didn't net.
Kalshi vs Polymarket: The Tax-Reporting Difference
The headline difference is regulatory, and it flows straight into your paperwork: Kalshi is a US, CFTC-regulated exchange and can issue tax forms; Polymarket is offshore and issues nothing. Because Kalshi operates inside the US reporting regime, it has the infrastructure to produce information returns and year-end summaries, and its CFTC status is what gives the Section 1256 argument any traction at all. Polymarket's offshore, on-chain structure means there's no form, no summary and a much weaker case for any treatment beyond plain short-term capital gains.
For a deeper structural comparison of the two platforms — custody, fees, regulation and trading experience — see our breakdown of Polymarket vs Kalshi. The regulatory gap that shapes their tax reporting is the same gap that shapes nearly everything else about them. If you trade Polymarket from the US, it's also worth understanding whether Polymarket is legal in the US before you worry about how to report it.
The 2026 Change Every Trader Should Know
If you're tempted by the gambling-income framework, the One Big Beautiful Bill Act made it meaningfully worse starting in the 2026 tax year. The Act — signed into law on July 4, 2025 — caps the deduction for gambling losses at 90% of gambling winnings, where previously losses were deductible up to 100% of winnings.
The consequence is "phantom income." Win $100,000 and lose $100,000 over the year, and under the old rule you owed nothing — losses fully offset wins. Under the 2026 rule, you can deduct only $90,000 of those losses, leaving $10,000 of taxable income on a year where you broke even in reality. For a high-volume trader who churns through many positions, the gross-winnings figure can dwarf the net result, and a 90% cap on the offsetting losses turns a flat year into a tax liability.
This change only bites if your activity is treated as gambling. It is one of the strongest practical arguments cited for the capital-gains framework, where losses net against gains without any percentage haircut. As always, which framework legitimately applies to your activity is a question for your tax professional — not a setting you get to pick for convenience.
How to Reconstruct Your Polymarket Records
Since Polymarket hands you no statement, your tax record has to be rebuilt from the only authoritative source: the blockchain. Every position you ever opened, closed or redeemed is recorded on Polygon, tied to your wallet address, with an exact timestamp and a USDC amount. That on-chain history is your brokerage statement — it just isn't formatted like one.
The reconstruction has two hard parts. The first is completeness: you need every buy, every sell and every market resolution, not just the trades you remember. The second is cost basis in USD. Your entries and exits are denominated in USDC, but the IRS wants dollars, so each transaction has to be valued at its USD equivalent at the time it happened. For most of a position's life that's close to 1:1, but you can't assume it — you have to document it. Remember too that Polymarket fees affect your cost basis: the taker fee you pay on entry is part of what the position cost you, and the fee on exit reduces your proceeds, so a clean record has to capture both.
This is exactly why a clean, auditable on-chain profit-and-loss record is worth more than a vague mental tally. A wallet's history is verifiable by anyone — including you, your accountant and, if it ever comes to it, the IRS. Tools that surface verifiable on-chain PnL turn that raw ledger into a position-by-position record of proceeds, basis and realized gain, which is the form a tax preparer actually needs. The same on-chain transparency that lets you vet a trader before copying them is what lets you substantiate a number on your return.
If you want that record kept continuously rather than reconstructed in a panic each April, the cleanest approach is to track your prediction-market activity as it happens, so your realized-gain ledger is always current instead of something you scrape together after the fact.
How to Report Polymarket on Your Taxes
Reporting Polymarket comes down to turning your on-chain history into a defensible profit-and-loss figure and placing it on the right form for the treatment you've chosen with a professional. Here's the sequence:
- Export your full trade history: pull every buy, sell and resolution from your wallet's on-chain record.
- Establish cost basis in USD: convert each USDC entry/exit to its USD value at transaction time.
- Calculate gain or loss per position: proceeds minus basis for each resolved or sold market.
- Choose your reporting treatment: capital gains or gambling income — decide with a professional.
- File and keep records: retain your reconciled ledger in case of audit.
The fifth step is the one people skip and regret. With no 1099 backing you up, your reconciled ledger is the only evidence you have. Keep it.
Frequently Asked Questions
Does Polymarket send a 1099?
No. Polymarket does not send a 1099 or any other US tax form, and it does not report your activity to the IRS. The platform's offshore, on-chain structure sits outside the US information-reporting regime. You are still required to report your gains yourself — the missing form changes nothing about the obligation.
Are Polymarket winnings taxable if I never withdraw to my bank?
Yes. A gain is generally taxable when it's realized — when you sell a position or a market resolves in your favor — not when you cash out to a bank account. Leaving your profits sitting in USDC on-chain does not defer the tax. Withdrawal is a separate, later event and doesn't determine when income is recognized.
Should I report Polymarket as capital gains or gambling income?
There's no IRS guidance settling this, so there is no single "correct" answer. Most prediction-market tax professionals lean toward capital-gains treatment (Form 8949 and Schedule D), which generally produces better loss mechanics. The gambling-income treatment is the alternative and is usually less favorable, especially under the 2026 loss cap. Decide with a qualified professional based on your specific facts.
How do I get my Polymarket transaction history for taxes?
Pull it from the blockchain. Every trade and resolution tied to your wallet is recorded permanently on Polygon. You'll need every buy, sell and resolution, each valued in USD at the time it occurred. Tools that surface verifiable on-chain PnL can turn that raw ledger into the position-by-position record your accountant needs.
Do I owe taxes on Polymarket if I lost money overall?
It depends on the treatment. Under capital-gains treatment, a net loss generally means no tax on the activity and may even offset other income. Under gambling treatment, you can owe tax even on a break-even year, because winnings are reported gross and the 2026 loss cap limits your deduction to 90% of winnings — leaving "phantom income" on a year you didn't actually profit.
Is Kalshi taxed differently than Polymarket?
Potentially, yes — because the platforms are regulated differently. Kalshi is a US, CFTC-regulated exchange that can issue tax forms and has a plausible (though still untested) Section 1256 argument. Polymarket is offshore, issues no forms, and is most commonly treated as plain short-term capital gains. See our full Polymarket vs Kalshi comparison for the structural differences behind this.
Reminder: this is general information, not tax advice. The tax treatment of prediction markets is unsettled, and the IRS has issued no guidance specific to event contracts. Nothing here is a substitute for consulting a qualified tax professional about your own situation.
If you're going to trade prediction markets seriously, the discipline that protects you at tax time is the same one that makes you a better trader: keep a clean, verifiable, position-by-position record of everything. A copy trading bot for Polymarket that logs your activity on-chain as it happens gives you that record by default — so when April comes, the ledger is already built.
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