Kalshi Fees vs Sportsbook Vig: The Real Cost Math
Reviewed by Benny Ricciardi
Kalshi charges a small taker fee on each fill — at most 1.75¢ per contract. Sportsbooks embed vig in every line. Same trade, very different cost structure — and it diverges fast once you stack legs. Here is what you actually pay on each platform across real trade types, computed from the published formula rather than quoted.
The Two Fee Models in One Paragraph
A sportsbook takes its cut up front. A -110 line pays you $0.91 per dollar risked on a 50/50 outcome — about 4.5% vig per side. The book pockets that whether you win or lose. Kalshi takes a published, per-contract taker fee when your order fills: 7% × price × (1 − price), rounded up to the cent, so a 50¢ contract costs 1.75¢ and a 90¢ contract 0.63¢ — paid whether the position wins or loses, with nothing owed at settlement. No hidden spread, no embedded multiplier compression. Two completely different cost shapes. Which is cheaper depends entirely on what kind of trade you are running.
Real Cost by Trade Type
| Scenario | Stake | Kalshi | Sportsbook | Cheaper |
|---|---|---|---|---|
| Single 60¢ YES contract, $100 stake | $100 stake | $2.79 taker fee at the fill (7% × 0.60 × 0.40 on 166 contracts) | ~$4.50 vig on equivalent -150 line | Kalshi |
| Single 40¢ YES contract, $100 stake | $100 stake | $4.20 taker fee at the fill (7% × 0.40 × 0.60 on 250 contracts) | ~$10 vig on equivalent +150 line | Kalshi |
| 2-leg combo (both 60¢) | $100 stake | $4.47 — one fee on a ~36¢ combo contract | 8–10% compounded vig (-110 × -110) | Kalshi |
| 3-leg parlay / combo (60¢ legs) | $100 stake | $5.46 — one fee on a ~22¢ combo contract | 12–18% compounded vig | Kalshi |
| 4-leg player-prop parlay (60¢ legs) | $100 stake | $6.09 — one fee on a ~13¢ combo contract | 15–25% implied hold | Kalshi |
| Losing position (60¢ single, $100 stake) | $100 stake | Stake plus the $2.79 fee already paid at entry | Stake only — the vig was in the price | Book |
Why Kalshi Wins on Multi-Leg Trades
Sportsbook parlays compound vig multiplicatively. Each -110 leg keeps roughly 4.5% for the book; chain four of them together and the implied hold blows past 20% by the time the multipliers are normalized to fair odds. Kalshi combos do not compound — a combo is one contract priced at the combined probability, and it pays one taker fee on that price, whether it has 2 legs or 7.
Worked example: A four-leg combo of 60¢ contracts prices near 13¢ (0.6⁴). A $100 stake buys about 770 combo contracts and pays about $6 in taker fees at the fill (7% × 0.13 × 0.87 per contract); all four hit → roughly $770 back, about $663 net of stake and fee. Same four +120 sportsbook parlays at $100 stake → fair payout ~$2,200 if legs were +130 each, but standard parlay multipliers compress that to ~$1,800–$1,900. That gap — typically $200–$400 on a 4-leg ticket of this size — is the parlay vig.
Price your own combo on the Kalshi parlay calculator →When the Sportsbook Is Actually Cheaper
Honest math: on a single position the book is rarely cheaper. A -110 line embeds about 4.5% of stake; Kalshi's taker fee on a 50¢ contract is 3.5% of stake, and it shrinks as the price moves away from 50¢. Where a book can win is a long shot priced around 5¢ (Kalshi's fee is 0.33¢ on a 5¢ contract — 6.7% of stake) or a contract you would have to cross a wide Kalshi spread to fill. The structural cost gap widens further on:
- →Multi-leg combos or parlays (Kalshi gets cheaper every additional leg)
- →Player props (sportsbook props typically carry 6–8% vig per leg)
- →Long-tail futures (sportsbook books pad futures hold to 25–35%)
- →Politics, economics, weather (sportsbooks rarely list these at all)
- →Active traders qualifying for Kalshi Pro fee reductions
How DraftKings Predict and FanDuel Predicts Compare
DraftKings Predict and FanDuel Predicts both embed fees in the price spread the same way their sportsbook products embed vig in the line. The exact spread varies by market and is not published as a flat fee. That makes the effective cost less transparent than Kalshi's published per-contract taker fee — you do not always know what you are paying until you compare equivalent prices side by side.
Fees FAQ
How much does Kalshi charge in fees?
Kalshi charges a trading fee on each fill, not on winnings: 7% × contracts × price × (1 − price), rounded up to the cent, so it peaks at 1.75¢ per contract on a 50¢ contract and shrinks toward zero at the extremes. It is paid at entry whether the position wins or loses; there is no settlement fee. Resting (maker) orders pay no fee on most standard markets. Active traders qualify for reduced trading fees under the Kalshi Pro program. There is no embedded spread the way a sportsbook builds vig into every line.
What is the vig at a typical sportsbook?
Standard sportsbook vig on a two-sided market is around 4–5% (-110/-110 lines). Parlays compound: a 4-leg parlay typically carries 15–25% implied hold once the multipliers are normalized to fair odds. Player props frequently price at 6–8% vig per leg.
Is Kalshi cheaper than a sportsbook?
Usually, yes — and on singles too. A $100 position on a 60¢ Kalshi contract pays about $2.80 in taker fees (7% × 0.60 × 0.40 on 166 contracts) against roughly $4.50 of vig baked into the equivalent -150 line; at 40¢ it is about $4.20 against $10. Kalshi's fee peaks at 1.75¢ per contract on a 50¢ contract and falls toward zero at the extremes, while a book's vig is a flat share of every line. On parlays and player props the gap widens further, because a Kalshi combo pays one fee on one contract and a parlay compounds vig on every leg.
How does DraftKings Predict pricing compare?
DraftKings Predict embeds fees in the price spread the same way the DraftKings sportsbook embeds vig in the line. The exact spread varies by market and is not published as a flat fee. Kalshi's taker fee is a published formula — 7% × price × (1 − price) per contract — charged at the fill, win or lose.
Can I reduce Kalshi fees?
Yes. Kalshi Pro tiers reduce trading fees for traders meeting volume thresholds. Active traders, market makers, and high-frequency participants typically qualify. Fee reductions kick in incrementally as volume grows.
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