You made a killing on Kalshi or Polymarket this year predicting the Fed's next rate cut or a major political upset. Your account balance looks amazing. You feel like a financial genius. Then April rolls around, and you realize nobody actually knows how prediction markets taxed transactions are supposed to be reported to the IRS.
The IRS hasn't issued explicit guidance on event contracts. They haven't told us if it's gambling, capital gains, or something else entirely. This means you are essentially playing tax roulette with your portfolio. If you guess wrong on your tax return, you could end up facing a brutal audit, massive back-taxes, or a phantom tax bill on money you actually lost.
The explosive growth of these platforms has left the tax code in the dust. With multi-billion dollar trading volumes and the legalization of major US platforms, the IRS will notice you. Ignoring this or picking a random reporting strategy without understanding the risks is a recipe for financial disaster.
The Four Ways Your Profits Could Be Taxed
Because the federal government hasn't drawn a clear line in the sand, accountants are currently using four radically different tax frameworks to report prediction market income. The path you choose changes everything about what you owe.
The Ordinary Income Route
This is the most conservative approach. Many tax professionals choose to report net profits as Other Income on Schedule 1, Line 8z of Form 1040. You basically label it prediction market earnings, take your net profit, and add it to your ordinary income.
Your gains are hit at your standard marginal tax rate, which runs anywhere from 10% to 37%. If you're in the 24% bracket and you netted $10,000, you owe $2,400. It's simple, but it doesn't give you any of the preferential rates that traditional investors enjoy.
The Capital Gains Treatment
A lot of traders argue that these positions are financial assets under Internal Revenue Code Section 1221. When you buy a "Yes" or "No" contract, you're buying a property asset that resolves to a set value, usually a dollar. Under this method, you use Form 8949 and Schedule D, treating it just like trading stocks or crypto.
The upside here is that your losses offset your gains directly. If you hold a contract for over a year, you get long-term capital gains rates of 0% to 20%. The reality is that almost everyone trades these contracts in days or weeks, meaning they remain short-term gains taxed at ordinary income rates anyway.
The Section 1256 Loophole
This is the holy grail for active traders, though it comes with high audit risks. Platforms like Kalshi and the recently compliant US wing of Polymarket operate as Designated Contract Markets regulated by the Commodity Futures Trading Commission. Some aggressive tax pros argue their contracts should fall under Section 1256, which governs regulated futures and options.
Section 1256 grants an automatic 60/40 split. No matter how fast you flip the contract, 60% of your net gains are taxed at the lower long-term capital gains rate, and only 40% are taxed at your short-term rate. On a large trading profit, this can save you tens of thousands of dollars compared to ordinary income treatment. The catch is that the IRS has never explicitly stated that event contracts qualify, and utilizing this framework might put a giant bullseye on your tax return.
The Gambling Nightmare
If the IRS decides prediction markets are just dressed-up sports books, you are in serious trouble. Treating these markets under Section 165(d) wagering rules triggers the most punitive tax structure possible. Under gambling rules, you must report your total gross winnings as income.
The new rules under the One Big Beautiful Bill Act capped gambling loss deductions at 90% of your winnings. You also have to forgo the standard deduction and itemize on Schedule A just to claim those limited losses.
The Devastating Reality of Phantom Income
Let's look at how the gambling framework completely ruins a high-volume trader. Imagine you spend the year aggressively trading politics and economic data on Kalshi. You have $500,000 in winning trades and $500,000 in losing trades. Economically, you made zero dollars. You broke even.
If the IRS forces gambling treatment, your taxable gross income is $500,000. Under the 90% loss cap, you can only deduct $450,000. This leaves you with $50,000 of taxable income on an actual economic profit of zero. At a high marginal tax bracket, you are stuck paying close to $20,000 in cash taxes for a year where you didn't make a single cent.
This phantom income trap is driving active traders crazy. This is precisely why the choice of how you file matters so much right now.
The Crypto Double Tax Wrinkle on Polymarket
If you use Polymarket, your tax situation gets even messier because of how the platform operates behind the scenes. Kalshi lets you deposit and trade directly in US dollars. Polymarket uses USDC, a stablecoin running on the Polygon blockchain.
The IRS views crypto as property. Every single time you use USDC to buy a prediction contract, you are disposing of a digital asset. This creates two completely separate taxable events for a single trade:
- The disposal of your USDC, which can trigger a capital gain or loss depending on your original cost basis for that stablecoin.
- The ultimate outcome or sale of the prediction contract itself.
Even though stablecoins generally stay pegged to one dollar, small price fluctuations or the way you acquired the USDC can create micro-gains and losses that must be tracked. If you are manually calculating hundreds of blockchain transactions, you will fail.
You also can't hide behind the fact that Polymarket doesn't mail you a 1099 form. The IRS explicitly asks on the very front page of Form 1040 whether you received, sold, or exchanged digital assets. Checking "No" while hiding profitable blockchain volume is a fast track to criminal tax fraud territory. The blockchain is public; the IRS can trace your wallet straight back to your bank account.
What You Need to Do Right Now
Sitting around waiting for the IRS to issue a formal ruling isn't an option. They move slowly, and your tax deadline won't wait. You have to take control of your reporting strategy immediately.
- Pull your complete history. Don't rely on account summaries. Export raw CSV files of every trade, fee, and deposit from your platforms. For Polymarket, connect your public wallet address to dedicated crypto tax software to parse the data.
- Pick a strategy and stick to it. Consistency is your best defense against an auditor. If you choose the capital gains approach, apply it to all your trades and don't switch to Section 1256 next year just because it favors your math.
- Hire an expert who actually understands Web3 and derivatives. Your local strip-mall tax preparer will look at you like you are speaking a foreign language. Find a CPA who understands the intersection of CFTC regulations, digital assets, and the IRS code.
- Set aside cash for quarterly estimates. If you are racking up significant net profits, your standard payroll withholdings won't cover the bill. Pay quarterly estimated taxes to avoid compounding penalties when you file.
The wild west era of untaxed prediction market profits is officially over. Treat these trades with the same administrative rigor you would use for an active stock portfolio, or prepare to face the consequences when the tax authorities inevitably catch up.
