Polymarket Tax Reporting: What Traders Owe

Polymarket tax reporting falls entirely on you. The platform does not send 1099 forms. It does not report your trades to the IRS. And because Polymarket sits outside CFTC regulation, the tax classification of your gains is genuinely unsettled.

This is the practical guide: how your Polymarket profits are likely taxed, how to calculate what you owe under each scenario, and exactly what records you need to keep.

For the full picture on prediction market taxation across all platforms, start with our complete guide to how prediction markets are taxed.

Why Polymarket Is Different From Kalshi

Kalshi is a CFTC-regulated designated contract market based in the US. It issues 1099 forms and operates under clear regulatory oversight. Our Kalshi 1099 guide covers that process in detail.

Polymarket is none of those things. It is a global platform built on the Polygon blockchain. You trade using USDC (a stablecoin). Your positions are on-chain smart contracts, not exchange-cleared event contracts.

This distinction matters for taxes in three ways:

Robinhood and Coinbase event contracts route through Kalshi's exchange, so they inherit the same 1099 reporting and Section 1256 eligibility. CME-partnered platforms like DraftKings and FanDuel also issue 1099 forms and carry a similar Section 1256 argument. ForecastEx, operated by Interactive Brokers, issues 1099s but operates as an exempt board of trade rather than a DCM, making its Section 1256 status less certain.

The bottom line: Kalshi and most regulated platforms do some of the tax work for you. Polymarket does zero.

Three Possible Tax Classifications

The IRS has not issued specific guidance on prediction market contracts traded through crypto-native platforms. Your Polymarket gains could fall into one of three buckets.

1. Short-Term Capital Gains (Property Treatment)

If the IRS treats Polymarket contracts as property (the same way it treats most crypto assets), your gains are taxed as capital gains. Since most prediction market positions resolve in under a year, that means short-term capital gains taxed at your ordinary income rate.

Under this classification, each contract purchase is an acquisition of property, and each resolution or sale is a disposition. You calculate gain as sale price minus cost basis minus fees.

2. Gambling Income

If the IRS views Polymarket trades as wagers rather than investments, your profits are gambling income reported on Schedule 1. The effective tax rate is the same (ordinary income), but the mechanics differ. Gambling losses can only offset gambling gains, not other income. And if you itemize deductions, the reporting requirements are stricter.

2026 update: The One Big Beautiful Bill Act now caps gambling loss deductions at 90% starting in 2026. If your Polymarket activity is classified as gambling, you can only deduct 90% of your losses. Break even on the year and you still owe tax on 10% of your losses as "phantom income." This makes the gambling classification even more costly for Polymarket traders.

3. Section 1256 Contract Treatment

CFTC-regulated exchanges like Kalshi may qualify for Section 1256 treatment, which applies a favorable 60/40 tax split: 60% of gains taxed at long-term rates, 40% at short-term rates. Because Polymarket is not CFTC-regulated, this classification almost certainly does not apply. We mention it only for completeness.

Our event contract tax treatment guide breaks this down further.

For most Polymarket traders, the realistic question is: capital gains or gambling income? Consult a tax professional who understands crypto. The answer affects your entire filing strategy.

How to Calculate Your Polymarket Tax Liability

Let's work through a concrete example under the two most likely scenarios.

The Trade

You deposit 1,000 USDC into Polymarket. You buy 2,000 YES contracts on a political event at $0.30 each (spending 600 USDC). The event resolves YES, and your contracts pay out at $1.00 each. Polymarket charges approximately 2% in fees on entry.

Here are the raw numbers:

• Cost basis: 2,000 contracts x $0.30 = $600.00
• Entry fees (2%): $12.00
• Total invested: $612.00
• Payout: 2,000 contracts x $1.00 = $2,000.00
• Gross gain: $2,000.00 - $612.00 = $1,388.00

Use our prediction market fee calculator to get precise fee amounts for your actual trades.

Scenario A: Capital Gains Treatment

Under property treatment, you report the $1,388.00 gain on Schedule D. If you are in the 24% federal tax bracket and held for under one year:

• Federal tax owed: $1,388.00 x 0.24 = $333.12
• Net profit after federal tax: $1,388.00 - $333.12 = $1,054.88
• Effective return on investment: $1,054.88 / $612.00 = 172.4%

State taxes apply on top of this. A California resident at 9.3% owes an additional $129.08, bringing the total tax to $462.20.

Scenario B: Gambling Income Treatment

Under gambling treatment, you report the same $1,388.00 on Schedule 1 as other income. The federal rate is identical at your ordinary income bracket. The difference: if you had $500 in Polymarket losses on other trades that year, those losses can only offset your Polymarket (gambling) gains under this classification. They cannot reduce your W-2 or freelance income.

Run your expected value calculations before entering any trade with our PM EV calculator. Knowing your pre-tax expected value makes post-tax planning much easier.

The USDC Complication

Polymarket trades happen in USDC, not USD. This adds a crypto layer that creates additional taxable events to track.

Acquiring USDC: When you buy USDC with USD, you establish a cost basis in that USDC. Stablecoins are pegged to $1.00, so in practice this basis is straightforward. But if USDC ever depegs (it briefly traded at $0.87 in March 2023), the difference between your acquisition price and disposal price is itself a taxable event.

Bridging to Polygon: Moving USDC from Ethereum to Polygon involves gas fees. These fees are paid in ETH or MATIC and are part of your cost basis for the trade. Track them.

Withdrawing: When you convert winnings back to USD, that conversion is a disposal of USDC. Again, if the value is $1.00 per USDC, the gain on the stablecoin itself is zero. But you still need the records.

Most traders will not owe meaningful extra tax from the USDC layer. But the IRS expects you to track every step. Do not skip this.

What Records to Keep

Polymarket does not generate tax documents for you. You need to maintain your own records throughout the year.

Here is the reporting workflow from start to finish:

Track every one of these:

• Deposit records: Date, amount, and source of every USDC deposit
• Trade confirmations: Entry price, number of contracts, market, and timestamp for every buy and sell
• Fee receipts: Entry fees, exit fees, and any gas fees for bridging or withdrawing
• Resolution records: Final payout per contract and resolution date
• Wallet records: On-chain transaction hashes for deposits, withdrawals, and bridging
• Cost basis calculations: Per-trade cost basis including fees

Polymarket's interface shows your trade history. Export it regularly. On-chain data is permanent, but having organized records saves hours at tax time.

Third-Party Tools for Polymarket Tax Tracking

Several crypto tax platforms support Polymarket transaction imports:

• Koinly connects to Polygon wallets and can categorize prediction market trades
• CoinTracker supports custom transaction labeling for event contracts
• TokenTax handles DeFi and on-chain activity, including Polymarket

None of these tools are Polymarket-specific. You will likely need to review and manually categorize some transactions. But they handle the heavy lifting of matching buys to sells, calculating cost basis, and generating Schedule D or Schedule 1 forms.

Before importing, use our breakeven calculator to verify your cost basis numbers match what the tax tool calculates. Discrepancies are common with on-chain data.

Honest Assessment: This Is Murky Territory

We are not going to pretend this is straightforward. The tax treatment of crypto-native prediction markets is genuinely unsettled.

The IRS has not issued specific guidance on Polymarket or similar platforms. Different tax professionals will give different advice on classification. The regulatory landscape is shifting as prediction markets gain mainstream adoption.

Here is what we know for certain:

1. You owe taxes on Polymarket profits. The classification is debatable. The obligation is not.
2. Polymarket will not do the reporting for you. This is entirely self-service.
3. Records matter more than classification. Whatever treatment you choose, consistent and thorough documentation protects you.
4. A crypto-savvy CPA is worth the cost. The money you save on correct classification will likely exceed the fee.

For a side-by-side look at how different platforms handle taxes, our prediction market tax guide covers the full landscape. And understanding platform fees is essential for accurate cost basis calculations.