Prediction Markets vs Sports Betting: The Real Differences (Legality, Taxes, Odds)
A sportsbook sets the odds and takes the other side. A prediction market lets you trade against other people. What that changes for legality, taxes and odds.
A prediction market is an exchange where you trade contracts with other people, and the price is the crowd’s odds. A sportsbook is the house. It sets the odds, takes the other side of your bet, and prices in a margin called the vig.
That one structural difference drives everything else: what you can trade, who regulates it, when you can get out, and how your winnings are taxed.
Disclosure: Nika builds a prediction-markets app, so we are not neutral about the category. We rate it on the record rather than on vibes, including the research showing most traders lose money, and we say plainly where a sportsbook is the better fit.
The 30 second answer
- Structure: you trade with another user. A sportsbook takes the other side itself.
- Cost: a disclosed trading fee, charged separately from the price. Not the vig, which is baked into the odds.
- Scope: elections, economics, weather, court rulings and sports. Sportsbooks do sports.
- Regulator: the CFTC, federally. Sports betting is licensed state by state.
- Tax: unsettled, with no IRS guidance. Sports betting is gambling income. Starting with tax year 2026, you can deduct only 90% of your losses.
What is the difference between prediction markets and sports betting?
The difference is who takes the other side of your position. On a prediction market you buy a contract from another user, and if nobody wants to sell at your price, nothing happens.
At a sportsbook the operator is always willing to take your bet, because it has priced the odds to make money over time no matter who wins.
Everything below follows from that.
| Prediction market | Sportsbook | |
|---|---|---|
| Who takes the other side | Another user, on a two-sided exchange | The house |
| How the price is set | By what buyers and sellers agree to pay. A contract at 62 cents implies a 62% chance | By the operator, then adjusted for how the money is coming in |
| What it costs you | A disclosed trading fee, charged separately from the price. Not zero: Polymarket has charged taker fees since 2026, makers pay nothing, and Kalshi charges a fee that peaks near even odds | The vig, built into the odds. Standard US pricing is -110 on both sides of a spread, so you need about 52.4% winners to break even. Reduced-juice books price tighter |
| Getting out early | Sell the contract to another user at the current market price, any time before it resolves | Cash out is widely offered, but the price comes from the book, with its own margin on top of the vig you already paid |
| What you can trade | Elections, economic data, weather, culture, court rulings and sports | Sports, and in most books only sports |
| Who regulates it | The CFTC, federally, for contracts listed on a designated contract market | Each state, separately, since the Supreme Court struck down the federal ban in 2018 |
| How it is taxed | Unsettled. No IRS guidance exists on event contracts. Practitioners use at least four different tax treatments and do not agree | As gambling income, with a new 90% cap on deducting losses from tax year 2026 |
As of August 2026. Fee schedules, availability and litigation all change. Confirm current rules before funding any account.
Are prediction markets gambling?
Legally, in the United States, no. Practically, you’re still risking money on an uncertain outcome, and most people who trade lose.
Contracts listed on a CFTC-designated contract market are regulated as derivatives under the Commodity Exchange Act, not as gambling under state gaming law. That’s a real distinction with real consequences, and it’s the reason these platforms operate nationally while sportsbooks operate state by state.
But the regulatory label isn’t a risk label.
The research is blunt about how it goes. An academic working paper from researchers at the University of Toronto, HEC Montréal and ESSEC Business School analysed 2.4 million Polymarket users and found 68.8% of them lost money. The top 1% captured 76.5% of all profits.
An independent on-chain analysis of about 2.5 million wallet addresses put the losing share at 84.1%.
So the useful framing isn’t gambling versus investing. It’s that a prediction market is structured like a futures exchange and regulated like one, while carrying loss rates you’d expect from betting.
Both halves of that sentence are true. Anyone selling you only the first half is selling you something.
Are prediction markets legal in the US?
Yes, when the contracts trade on a CFTC-designated contract market. Kalshi has held that designation since November 2020, and the CFTC publishes the full list of designated exchanges.
The reason is jurisdictional. Event contracts are treated as derivatives, and derivatives are federal territory. That’s why a legal prediction market can be available in states that have never authorized a sportsbook.
Sports betting works the other way around. The Supreme Court struck down the federal ban in Murphy v. NCAA in 2018 and handed the question back to the states, which is why the map is a patchwork.
Where it gets contested is the overlap. Several states argue that sports event contracts are sports betting wearing a derivatives costume, and the courts have split on it.
In April 2026 the Third Circuit held that CFTC jurisdiction over sports event contracts is likely exclusive, and that federal law preempts New Jersey’s gambling statutes. In July 2026 a federal court in the Southern District of New York went the other way. The question isn’t resolved.
The practical upshot for you: the platform is probably available where you live, but its sports contracts may not be, and the list of restricted states has changed repeatedly this year.
Check the platform’s own availability page rather than any article, including this one. We deliberately don’t publish a state list here, because every published list we checked disagreed with the others.
How are prediction markets taxed vs sports betting?
Sports betting is settled law. Prediction market taxes are not. There is no IRS guidance on event contracts, so the tax treatment is genuinely unsettled.
Most pages that tell you otherwise are overstating what’s actually known.
Sports betting. Winnings are fully taxable and reported as other income on Schedule 1. You can only deduct losses if you itemize on Schedule A, and only up to your winnings.
Then there’s the change nobody saw coming.
From tax years beginning after 31 December 2025, the deduction for wagering losses is capped at 90% of losses. Not 100%.
So a bettor who wins $100,000 and loses $100,000 in the same year deducts $90,000 and pays tax on $10,000 of income that doesn’t exist.
That hits returns filed in 2027. IRS Topic 419 hasn’t been updated to describe it yet, so checking the IRS page today still shows you the old rule.
Prediction markets. Nobody knows for certain, and that’s the accurate answer rather than a dodge. The IRS has issued no ruling, regulation or notice addressing event contracts. Practitioners currently apply at least four different treatments:
- Wagering under section 165(d). Same rules as sports betting, including the 90% cap
- Capital gain or loss under section 1221. Losses offset capital gains plus $3,000 of ordinary income a year, carried forward indefinitely
- Ordinary income. Fact-specific and less common
- Section 1256, the 60/40 split. 60% long-term and 40% short-term regardless of holding period
That last one is the treatment you’ll see quoted most often, usually as though it were settled. It isn’t. Green Trader Tax, a firm that specialises in trader taxation, calls section 1256 treatment for event contracts “uncertain and may be considered aggressive,” on the grounds that these contracts don’t fit the statutory definitions.
Two more things worth knowing.
Tax practitioners report that Kalshi does not issue a Form 1099-B for event-contract trades, so the transaction record is yours to keep. And if the IRS eventually characterises event contracts as wagering, the 90% cap applies to them too, which would erase most of the tax advantage people currently assume they have.
If you trade enough for this to matter, talk to an accountant before you file, not after.
Are prediction markets more accurate than sportsbooks?
As probability estimates, generally yes, and the reason is the vig rather than superior insight.
A sportsbook line isn’t a pure forecast. It’s a forecast plus a margin, and often plus an adjustment for which side the public is loading up on.
Strip out the vig and the implied probabilities on both sides of a -110 line add up to about 105%, not 100%. A prediction-market price sits closer to a clean probability, because the fee sits outside the price rather than inside it.
The research on market forecasting is well established. Wolfers and Zitzewitz, writing in the Journal of Economic Perspectives in 2004, found that market-generated forecasts are typically fairly accurate and outperform most moderately sophisticated benchmarks. Work on the Iowa Electronic Markets pointed the same way across multiple election cycles.
Now the part that usually gets left out.
A 2026 working paper from researchers at London Business School and Yale, covering 1.72 million Polymarket accounts and $13.76 billion of volume, found that about 3% of traders account for most of the price discovery. The other 97% are, in aggregate, on the losing side.
Accuracy comes from a small group of informed traders, not from crowd wisdom. And being in the crowd isn’t the same as being in that 3%.
Sportsbook lines are sharp too, for what it’s worth. Their pricing teams are good and their liquidity is deep. The difference is that you’re reading a number designed to balance a book, not a number designed to be a probability.
So which should you use?
It depends on what you actually want, and for a lot of people the honest answer is a sportsbook.
Use a sportsbook if you bet on sports specifically, you want parlays, boosts and promos, you like knowing your exact payout the moment you place the bet, and you want a product built end to end for that one job. Prediction markets do not do any of that well.
Use a prediction market if you want to trade things other than sports, you want to exit a position at a market price instead of a price the house quotes you, you care that the number in front of you is closer to a real probability, or you live somewhere a sportsbook is not available.
Use neither if you can’t afford to lose the money. The loss data above applies to both.
If you want the mechanics first, start with how Nika’s prediction markets work. If you are weighing a specific platform, we looked at the biggest one on its own terms in is Kalshi legit, and at the field around it in Kalshi alternatives.
Where Nika fits
Nika offers prediction markets powered by Polymarket inside a single non-custodial app, alongside spot trading, perpetuals, staking and yield. Your funds stay in a wallet you control rather than on a company balance sheet, and the rest of your onchain positions sit in one place instead of spread across four apps.
Nika is not a CFTC-regulated exchange and does not claim to be. It’s not a sportsbook either, and it will never give you a parlay or a same-game boost.
So if you want regulated dollar event contracts with US tax paperwork at the end of the year, Kalshi is the better fit and we would say so.
If you want to bet on the NFL with promos and a familiar app, a licensed sportsbook in your state is the better fit, and we’d say that too.
If you want self-custody, and you’d rather not run a separate app for every product, that’s the gap Nika fills.
Prediction markets vs sports betting: FAQ
What is the difference between prediction markets and betting? The difference is who takes the other side. A prediction market matches you against another user on an exchange, and the price is the crowd’s implied probability. A sportsbook takes the other side itself and builds a margin called the vig into the odds. Prediction markets also cover elections, economics and weather, while sportsbooks cover sports.
Are prediction markets more accurate than sportsbooks? As probability estimates, generally yes, mostly because sportsbook odds include the vig. Strip out that margin and the two sides of a standard -110 line imply about 105% total probability, not 100%. Wolfers and Zitzewitz found in 2004 that market forecasts beat most moderately sophisticated benchmarks. A 2026 working paper adds a caveat: about 3% of traders drive most price discovery.
Why are prediction markets not considered gambling? They aren’t considered gambling because contracts listed on a CFTC-designated contract market are regulated as derivatives under the Commodity Exchange Act, not under state gaming law. That is a jurisdictional distinction, not a statement about risk. Several states dispute it for sports contracts specifically, and courts split on the question in 2026.
Do prediction markets count as gambling? Legally, in the US, no. Practically, you are risking money on an uncertain outcome and most people lose. An academic working paper covering 2.4 million Polymarket users found 68.8% of them lost money. Treat the regulatory label as a description of who oversees the venue, not as a measure of how risky it is.
Do people actually make money on prediction markets? A small minority do. The same working paper found the top 1% of users captured 76.5% of all profits, and an independent on-chain analysis put the share of traders in the red at 84.1%. Profits are heavily concentrated among a few informed, repeat traders.
How are prediction markets taxed? There’s no IRS guidance on event contracts, so the answer is genuinely unsettled. Practitioners apply four treatments: wagering under section 165(d), capital gain or loss under section 1221, ordinary income, or the section 1256 60/40 split. The 60/40 treatment is the one most often quoted online, and it’s considered aggressive. Practitioners also report that Kalshi issues no 1099-B for event-contract trades. Talk to an accountant.
Are prediction markets legal in all 50 states? The platforms operate under federal CFTC oversight rather than state licensing, so they are broadly available. Sports contracts specifically are restricted or unavailable in a number of states, that list has changed repeatedly through 2026, and the preemption question is being litigated. Check the platform’s own availability page for where you live.
Are prediction markets haram? The mainstream view is yes. Scholars generally treat staking money on an uncertain outcome, where the loser pays the winner and no asset changes hands, as maysir, with the contract’s uncertainty raising gharar. Being regulated as a derivative does not settle it, because AAOIFI’s Shariah standards already treat conventional futures as impermissible. Ask someone qualified in your own tradition.
This is information, not financial, legal or tax advice. Prediction markets and sports betting both carry real financial risk, the research shows most participants lose money, and legal status varies by state and country. Tax treatment of event contracts is unsettled and the rules on deducting wagering losses changed for the 2026 tax year. Confirm current rules with a qualified professional before funding any account.
Sources
- Wolfers, J. and Zitzewitz, E., “Prediction Markets”, Journal of Economic Perspectives 18(2), 2004 (primary): https://www.aeaweb.org/articles?id=10.1257/0895330041371321
- Berg, J., Nelson, F. and Rietz, T., “Prediction market accuracy in the long run”, International Journal of Forecasting 24(2), 2008: https://www.sciencedirect.com/science/article/abs/pii/S0169207008000320
- Only 3% of traders drive prediction markets’ accuracy, CoinDesk, 26 April 2026, on the London Business School and Yale working paper: https://www.coindesk.com/markets/2026/04/26/only-3-of-traders-drive-prediction-markets-accuracy-not-the-crowd-study-finds
- Most Polymarket users lose money while the top 1% claim 76.5% of gains, on the University of Toronto, HEC Montréal and ESSEC working paper: https://finance.yahoo.com/markets/options/articles/prediction-markets-hit-milestones-most-042140220.html
- Polymarket profitability analysis of 2.5 million wallet addresses, The Defiant, April 2026: https://thedefiant.io/news/research-and-opinion/polymarket-profitability-report-april-2026
- 26 U.S. Code section 165(d), wagering losses, as amended (primary): https://www.law.cornell.edu/uscode/text/26/165
- IRS Topic no. 419, gambling income and losses (primary): https://www.irs.gov/taxtopics/tc419
- Prediction market taxes: capital gains, gambling, or something else, Green Trader Tax, 23 April 2026: https://greentradertax.com/prediction-market-taxes-capital-gains-gambling-or-something-else/
- Prediction market contracts are showing up on client returns, National Association of Tax Professionals: https://www.natptax.com/news-insights/blog/prediction-market-contracts-are-showing-up-on-client-returns/
- New law cuts gambling loss deductions, Forbes, 13 January 2026: https://www.forbes.com/sites/nathangoldman/2026/01/13/gambling-tax-alert-new-law-cuts-loss-deductions-bettors-face-big-hit/
- CFTC designates KalshiEX LLC as a contract market, November 2020 (primary): https://www.cftc.gov/PressRoom/PressReleases/8302-20
- CFTC list of designated contract markets (primary): https://www.cftc.gov/IndustryOversight/TradingOrganizations/DCMs/index.htm
- Murphy v. NCAA, 584 U.S. 453 (2018) (primary): https://www.supremecourt.gov/opinions/17pdf/16-476_dbfi.pdf
- Third Circuit opinion, KalshiEX LLC v. Flaherty (primary): https://www2.ca3.uscourts.gov/opinarch/251922p.pdf
- Third Circuit affirms Kalshi’s preliminary injunction, Skadden, April 2026: https://www.skadden.com/insights/publications/2026/04/third-circuit-affirms-kalshis-preliminary-injunction
- Prediction markets for those who don’t predict and those who do, Cleary Gottlieb, April 2026: https://www.clearygottlieb.com/news-and-insights/publication-listing/prediction-markets-for-those-who-dont-predict-and-those-who-do
- What is vig and how is vigorish calculated, Legal Sports Report: https://www.legalsportsreport.com/how-to-bet/vigorish/
- Early cash out betting explained, BettingUSA: https://www.bettingusa.com/sports/cash-out/
- Polymarket fee schedule by category (primary): https://docs.polymarket.com/polymarket-learn/trading/fees
- Kalshi fee schedule, July 2026 revision (primary): https://kalshi.com/docs/kalshi-fee-schedule.pdf
- Are prediction markets halal or haram, Islamic Finance Guru, reviewed by Ibrahim Khan (MA Islamic Finance, Alimiyyah): https://www.islamicfinanceguru.com/articles/are-prediction-markets-halal-or-haram
- AAOIFI Shariah standards, which treat conventional futures contracts as impermissible: https://aaoifi.com/shariaa-standards/?lang=en
Prediction markets are worth understanding whether or not you ever trade one. If you do decide to, the version we build keeps your funds in a wallet you control. No urgency, and no rush to fund anything before you have read the tax section twice.