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 event 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, what the trade costs, and how your winnings are taxed.
Disclosure: This guide is published by Nika, a non-custodial trading app. Nika’s prediction markets are powered by Polymarket international. We are not neutral about the category. We rate it on the record, including research showing most traders lose money, and we say plainly where a sportsbook is the better fit.
The 30-second answer
- Structure: On a prediction market you trade with another user. A sportsbook takes the other side itself.
- Cost: Prediction markets charge a disclosed trading fee, often separate from the contract price. Sportsbooks bake the vig into the odds. Compare total execution cost, not only the headline fee or the juice.
- Scope: Prediction markets list elections, economics, weather, court rulings, culture, and sports. Sportsbooks focus on sports, with parlays, boosts, and promos.
- Regulator: US event contracts on designated exchanges sit under the CFTC. Sports betting is licensed state by state after Murphy v. NCAA (2018).
- Tax: Sports betting is gambling income. Event-contract taxes remain unsettled; there is no IRS guidance specific to them. From tax years beginning after 31 December 2025, wagering-loss deductions are capped at 90% of losses.
How we compared them
This article compares the products on five criteria:
- Counterparty and pricing: Who takes the other side, and how is the number in front of you set?
- Cost to enter and exit: Vig versus trading fees, including maker and taker treatment and spread.
- Access and legality: Federal derivatives rules versus state sportsbook licensing, and where sports event contracts are contested.
- Taxes: Settled gambling rules versus unsettled event-contract treatment.
- Fit: When a sportsbook is the better product, and when an exchange is.
We used platform fee documentation, CFTC records, court materials, tax primary sources, and published research. We did not open or fund sportsbook or exchange accounts for this article. Prediction-market examples name the exact product: Kalshi, Polymarket US, or Polymarket international. Those products do not share one fee schedule, custody model, or availability map.
Prediction markets vs sports betting at a glance
| 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 about a 62% chance | By the operator, then adjusted for liability and public money |
| What it costs you | A disclosed trading fee, usually charged when you take liquidity. Fee formulas and category exceptions differ by venue | The vig, built into the odds. Standard US pricing is often -110 on both sides of a spread |
| Getting out early | Sell the contract to another user at a market price, subject to available size and any exit fee | Cash out is widely offered, but the price comes from the book, with its own margin |
| What you can trade | Elections, economic data, weather, culture, court rulings, and sports | Sports, and in most books mainly sports |
| Who regulates it | The CFTC for contracts listed on a designated contract market; Polymarket international is onchain and not CFTC-regulated | Each state, separately, since the Supreme Court struck down the federal ban in 2018 |
| How it is taxed | Unsettled for event contracts. Practitioners apply several treatments and do not agree | As gambling income, with a 90% cap on deducting losses from tax years beginning after 31 December 2025 |
As of 9 October 2026. Fee schedules, availability, and litigation change. Confirm current rules before funding any account.
How a prediction-market trade works
For a typical binary event contract, a winning contract pays $1 and a losing contract pays $0. You buy exposure to a defined outcome at a price between those endpoints. The following examples are hypothetical and exclude fees unless stated otherwise; the contract’s own terms govern settlement.
Suppose a YES contract costs 60 cents and you buy 100 contracts:
| Outcome | Contract cost | Settlement payout | Profit or loss before fees |
|---|---|---|---|
| YES wins | $60 | $100 | $40 profit |
| YES loses | $60 | $0 | $60 loss |
The $100 winning payout includes the return of the $60 you spent. It is not $100 of profit. A market price of 60 cents can be read as roughly a 60% implied probability, but it is not a guarantee or a verified forecast.
You may also sell before the event resolves, provided another trader will buy at a price you accept. If the same 100 contracts sell at 70 cents, you receive $70 and make $10 before fees. If they sell at 40 cents, you receive $40 and lose $20 before fees. Fees can apply to both the entry and the exit.
An early exit is useful when your view changes or you want to reduce exposure, but it depends on available buyers. A displayed portfolio value does not promise that your entire position can be sold at that price.
Similar questions can have different settlement rules
Two markets can look identical in their headlines while using different deadlines, data sources, or definitions. A sports contract might treat postponements one way on an exchange and another way at a sportsbook. Before comparing prices, confirm that you are comparing the same outcome under the same conditions.
Cost: vig versus trading fees
What the vig costs on a sportsbook
A sportsbook’s margin is usually inside the odds rather than shown as a separate commission. Standard US pricing of -110 on both sides of a spread means you risk $110 to win $100. To break even over many bets of that type, you need about 52.4% winners, not 50%. Reduced-juice books price tighter; parlays and boosted props can carry a larger effective margin.
That break-even figure is about the house edge baked into the price. It is not a prediction that you will lose every session, and it does not include bonuses, limits, or cash-out adjustments.
What prediction-market fees look like
On major US and international venues, taker fees often use a coefficient times contracts times price times (1 − price). Price is in dollars, so 50 cents is 0.50. Dollar fees peak near even odds and fall toward either extreme. Rounding and product exceptions differ by venue.
| Venue and category | Taker coefficient | Fee for 100 contracts at 50 cents |
|---|---|---|
| Kalshi, general schedule (effective 7 July 2026) | 0.07 | $1.75 |
| Polymarket US, standard straight trades (schedule effective 7 October 2026) | 0.0695 | $1.74 |
| Polymarket international, crypto | 0.07 | $1.75 |
| Polymarket international, sports, economics, culture, weather, other | 0.05 | $1.25 |
| Polymarket international, politics, finance, tech, mentions | 0.04 | $1.00 |
| Polymarket international, geopolitics | 0 | $0.00 |
These examples describe direct venue fees, not the total cost through every app or funding method. Sources: Kalshi fee schedule, Polymarket US fees, and Polymarket international fees, reviewed on 9 to 10 October 2026.
Polymarket’s international category schedule has applied since 30 March 2026, and its sports rate rose from 0.03 to 0.05 on 10 July 2026 (changelog).
Product exceptions matter. Kalshi lists series with different maker or taker multipliers. Polymarket US uses a separate combo taker curve. Under its schedule effective 7 October 2026, table-tennis markets carry a 0.10 taker coefficient and combo fills earn no maker rebate; standard straight trades remain at 0.0695. Always check the fee shown for the order you are about to place.
A coefficient is not a flat percentage of your stake
Using Kalshi’s general schedule, buying 100 contracts at 50 cents costs $50 before fees. The calculation is 0.07 × 100 × 0.50 × 0.50 = $1.75. Your entry cost is $51.75, and a $100 winning payout leaves $48.25 of profit before any other costs.
That $1.75 is 3.5% of the $50 contract purchase, not 7% of it. The coefficient and the effective percentage of money spent are different measures. If you sell before settlement, include any exit fee when calculating the result.
Maker orders, taker orders, and limit orders
A maker adds a resting order to the book; a taker executes against an order already available. A limit order can do either. Setting a price limit does not automatically make an order fee-free.
For example, if contracts are offered at 60 cents and your buy limit is 60 cents, your order can fill immediately as a taker. If your limit is 58 cents and no seller accepts it, the order may rest as a maker until a match occurs. An order can also fill partly immediately and leave the remainder resting.
Kalshi generally waives maker fees except on specified series. Polymarket US offers maker rebates on eligible straight trades. Polymarket international charges no maker fee and runs rebate programs subject to their own rules. Rebates have conditions; they are not guaranteed trading profits.
Compare total execution cost, not only the fee column
A one-cent difference between two venue fee examples rarely decides the best place to trade. Spreads, available size, funding charges, cash-out margins, and any intermediary fee can matter more.
Hypothetical sportsbook path: You bet $100 at -110 on a side. Your stake is $100; a win pays $90.91 of profit plus the stake back. If you cash out early, the book quotes its own price, which can sit inside the already-vigged market.
Hypothetical exchange path: You buy 100 YES contracts at 52 cents for $52, plus a taker fee. On Polymarket international sports at coefficient 0.05, that fee is 0.05 × 100 × 0.52 × 0.48 ≈ $1.25. Entry cost is about $53.25. A win at settlement pays $100, so profit before any other costs is about $46.75. If you instead sell early, your result depends on the bid you can hit and any exit fee.
Neither path is automatically cheaper. Compare the quote for your size, the fee on that fill, and the cost of getting money in and out.
Deposit clearance, withdrawal eligibility, and payout arrival
These are different stages. On a custodial exchange or sportsbook, buying power after a deposit is not the same as cleared funds, and cleared funds are not the same as money that has arrived in your bank. On Polymarket international, the venue lists no platform fee to deposit or withdraw USDC, while on-ramps, bridges, and other intermediaries can still charge. Do not convert a typical processing window into a guaranteed end-to-end withdrawal time.
Getting out early
Prediction markets let you sell a position to another trader while the market is open. That is useful for cutting a loser, locking a gain, or reducing exposure before resolution. It is not a promised cash-out price. Thin books, wide spreads, and large orders can move the price against you.
Sportsbook cash out is widely offered and often easier for casual users: the operator quotes a price and you accept or decline. That convenience is part of the product. The quote already reflects the book’s margin on top of the vig you paid at entry.
If early exit is central to how you bet, compare both the typical cash-out offer at your sportsbook and the live bid-ask on the exchange contract you would actually trade.
What you can trade
Sportsbooks are built for sports. Parlays, same-game parlays, boosts, live betting, and promotional credits are core features. Prediction markets do not replicate that product well.
Prediction markets also list non-sports events: elections, economic releases, weather, culture, and court outcomes, depending on the venue and your eligibility. Sports volume is large on the leading exchanges, but aggregate volume does not prove that the specific game or prop you want is deep enough to trade at a fair price. Compare the contract terms, spread, and available size for the market you intend to trade.
For platform-level comparisons among exchanges, see Kalshi vs Polymarket, is Kalshi legit, and Kalshi alternatives.
Are prediction markets gambling?
Legally, in the United States, 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 is a jurisdictional distinction with real consequences: it is why regulated event exchanges can operate nationally while sportsbooks are licensed state by state.
Practically, you are still risking money on an uncertain outcome, and most people who trade lose.
An academic working paper from researchers at the University of Toronto, HEC Montréal, and ESSEC Business School analysed about 2.4 million Polymarket users and found 68.8% of them lost money, with the top 1% capturing 76.5% of all profits (Yahoo Finance summary). An independent on-chain analysis of about 2.5 million wallet addresses put the losing share at 84.1% (The Defiant, April 2026).
So the useful framing is not gambling versus investing. A prediction market can be structured and regulated like a derivatives exchange while still showing loss rates you would expect from betting. Both halves of that sentence can be true. Anyone selling you only the first half is selling you something.
Polymarket international is onchain and not CFTC-regulated. Its legal and tax posture can differ from Kalshi or Polymarket US even when the trading interface looks similar.
Are prediction markets legal in the US?
Yes, when the contracts trade on a CFTC-designated contract market. Kalshi has held that designation since 4 November 2020 (CFTC press release). Polymarket US, operated by QCX LLC, is also listed in the CFTC’s designated contract market records.
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 federal courts have split on preemption.
In April 2026 the Third Circuit affirmed a preliminary injunction for Kalshi against New Jersey, finding Kalshi had a reasonable chance of showing that federal law preempts the state’s gambling laws (opinion). That is an interim ruling, not a final decision on the merits. Later 2026 decisions and state actions have gone in different directions in other circuits and forums. Green Trader Tax’s 1 September 2026 update notes the Ninth Circuit’s late-August sports-contract analysis and the widening circuit split. The question is not settled nationwide.
The practical upshot: a platform may be available where you live while particular sports contracts are restricted, and the restricted list has changed repeatedly through 2026. Check the platform’s own availability page rather than any article, including this one. We deliberately do not publish a state list here, because published lists disagree with each other.
Polymarket international does not accept US users. Eligibility for Kalshi international accounts and for Polymarket international outside the US also depends on each venue’s geographic rules.
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 is 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. See IRS Topic no. 419.
From tax years beginning after 31 December 2025, IRC section 165(d) limits the deduction for wagering losses to 90% of those losses, and still only to the extent of wagering gains. 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 does not exist economically.
That change hits returns filed in 2027 for calendar-year filers. As of 24 September 2026, IRS Topic 419 still describes the older loss-matching rule and does not yet spell out the 90% cap, so checking the IRS page alone can still show incomplete guidance.
Prediction markets
Nobody knows for certain, and that is 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 treatments:
- Wagering under section 165(d). Same family of rules as sports betting, including the 90% cap if the contracts are treated as wagering.
- Capital gain or loss under section 1221. Losses offset capital gains plus $3,000 of ordinary income a year, with carryforward.
- 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 will see quoted most often, usually as though it were settled. It is not. Green Trader Tax calls section 1256 treatment for event contracts uncertain and potentially aggressive, on the grounds that these contracts do not clearly fit the statutory definitions.
Kalshi’s Help Center says users who meet IRS thresholds can receive 1099-INT, 1099-MISC, and certain crypto-related forms (1099-B / 1099-DA), plus a yearly profit and loss statement. Receiving no form does not establish that no tax is due, and a P&L statement is not a determination of character. On Polymarket international, you trade from your own wallet, so keep your own records. If the IRS eventually characterises event contracts as wagering, the 90% cap would apply to them too.
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 often the vig rather than superior insight.
A sportsbook line is a forecast plus a margin, and often plus an adjustment for which side the public is loading. At -110 on both sides, each side implies about 52.4%, so the two implied probabilities add up to about 104.8%, not 100%. The extra 4.8 points is the vig. A prediction-market price sits closer to a clean probability because the trading fee usually 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 (AEA). Work on the Iowa Electronic Markets pointed the same way across multiple election cycles.
A 2026 working paper from researchers at London Business School and Yale, covering about 1.72 million Polymarket accounts and $13.76 billion of volume, found that about 3% of traders account for most of the price discovery (CoinDesk summary, 26 April 2026). The other 97% are, in aggregate, on the losing side.
Accuracy comes from a small group of informed traders, not from crowd wisdom by itself. Being in the crowd is not the same as being in that 3%.
Sportsbook lines are sharp too. Pricing teams are good and liquidity is deep. The difference is that you are often reading a number designed to balance a book, not a number designed only 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 licensed sportsbook is not available and an eligible exchange is.
Within prediction markets, match the product to the job:
- Kalshi for dollar-funded event trading on a CFTC-designated exchange, including a large sports and combo menu where you are eligible.
- Polymarket US for a separate regulated US dollar account under Polymarket’s US exchange.
- Polymarket international for wallet-based trading where it is available; it is not available to US users.
Use neither if you cannot afford to lose the money. The loss data above applies to exchange trading; sports betting carries its own house edge and personal-finance risk.
If you want exchange mechanics first, start with decentralized prediction markets. If you are weighing a specific platform, see is Kalshi legit, Kalshi vs Polymarket, and Kalshi alternatives.
Where Nika fits
Nika brings prediction markets into the same non-custodial app as spot trading, perpetual futures, yield, and portfolio tools. Its prediction market access is powered by Polymarket international, not Polymarket US. That distinction matters for custody, eligibility, fees, and which contracts you are using.
For an eligible user who already holds digital assets, the benefit is managing event positions alongside other trading activity in one interface. Nika is available on web, iOS, and Android; individual product availability still depends on location.
Nika is not a CFTC-regulated exchange and does not claim to be. It is not a sportsbook either, and it will never give you a parlay or a same-game boost. It does not provide a route around Polymarket’s geographic restrictions, and prediction market access is unavailable to US users.
If you want regulated dollar event contracts with US tax paperwork at the end of the year, Kalshi or Polymarket US 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 would say that too.
If you want self-custody and would rather not run a separate app for every product, that is the gap Nika fills. Trades through Nika can also include Nika fees, so review the total shown before confirming an order rather than assuming the direct Polymarket international schedule is your complete cost.
For more on the experience, see prediction markets on Nika.
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. The two sides of a standard -110 line imply about 105% total probability, not 100%; the excess is the book’s margin. 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?
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 have split on the question in 2026. Polymarket international is a separate, onchain product.
Do prediction markets count as gambling?
Legally, for US CFTC-listed event contracts, no. Practically, you are risking money on an uncertain outcome and most people lose. An academic working paper covering about 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 is 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 is considered aggressive. Talk to an accountant.
Are prediction markets legal in all 50 states?
Regulated platforms operate under federal CFTC oversight rather than state sportsbook 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.
Is a limit order always fee-free on a prediction market?
No. A limit order sets the worst price you will accept. If it immediately matches a resting order, that fill is a taker trade and can incur a taker fee. If it rests and another trader later accepts it, it can be a maker trade. One order can have both types of fills.
Are prediction markets haram?
The mainstream view among many scholars is yes. Staking money on an uncertain outcome, where the loser pays the winner and no asset changes hands, is often treated 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. See Islamic Finance Guru and AAOIFI Shariah standards.
Sources
- Wolfers and Zitzewitz, “Prediction Markets,” Journal of Economic Perspectives 18(2), 2004
- CoinDesk summary of London Business School and Yale working paper on price discovery, 26 April 2026
- Yahoo Finance summary of University of Toronto / HEC Montréal / ESSEC Polymarket profitability working paper
- The Defiant: Polymarket profitability analysis of about 2.5 million wallet addresses, April 2026
- 26 U.S. Code section 165(d), wagering losses
- IRS Topic no. 419, gambling income and losses
- Green Trader Tax: prediction market taxes, updated 1 September 2026
- Forbes: new law cuts gambling loss deductions, 13 January 2026
- CFTC: KalshiEX LLC designated as a contract market, November 2020
- CFTC: QCX LLC d/b/a Polymarket US
- Murphy v. NCAA, Cornell LII
- Third Circuit opinion, KalshiEX LLC v. Flaherty
- Kalshi fee schedule (PDF; last updated and effective 7 July 2026)
- Kalshi: tax documentation and profit and loss statements
- Polymarket US: fees and rebates
- Polymarket international: trading fees
- Legal Sports Report: what is vig
- Islamic Finance Guru: are prediction markets halal or haram
- AAOIFI Shariah standards
- Polymarket: Predictions changelog (fee effective dates)
Explore prediction markets with Nika
Prediction markets are worth understanding whether or not you ever trade one. If you 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.
This article is for informational purposes and is not financial, legal, or tax advice. Prediction markets and sports betting both carry real financial risk, the research shows most prediction-market 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 tax years beginning after 31 December 2025. Confirm current rules with a qualified professional before funding any account.