Kalshi Fees Explained: How Much Does It Actually Cost to Trade in Florida?
Kalshi's variable fee structure confuses new traders. Here's exactly how fees work, with real Florida examples.
- Contract price: $0.58 (58% implied probability)
- Buy 100 contracts = $58 cost
- Approx. fee at $0.58: ~$2.32 (4% effective)
- If Dolphins win: receive $100, net profit = $39.68
- If Dolphins lose: lose $58 (no fee on losing trades)
The Honest Answer: Kalshi's Fee Structure, Fully Explained
Kalshi charges a variable trading fee on every contract. There is no flat percentage — the fee depends on the contract's current price. Understanding this structure is essential before you start trading, because it directly affects your profitability on different types of trades.
How Kalshi's Fee Formula Works
Kalshi's fee is calculated as a percentage of the expected profit on a winning contract, not on the total trade value. The exact formula varies by market.
Key principle: Fees are highest near $0.50 (where uncertainty — and therefore expected value — is greatest) and lowest near $0.01 or $0.99 (where outcomes are near-certain).
| Contract Price | Approx. Effective Fee |
|---|---|
| $0.01–$0.05 (longshots) | ~0.5–1% |
| $0.10–$0.20 | ~1–2% |
| $0.40–$0.60 (coin flips) | ~3–4% |
| $0.80–$0.90 | ~2–3% |
| $0.95–$0.99 (near certainties) | ~0.5–1% |
The counterintuitive result: Longshot and near-certainty contracts are the most fee-efficient. Mid-probability contracts near $0.50 carry the highest effective fee.
Real Florida Trade Examples with Fees
Example 1: Dolphins to win (slight favorite)
- •Contract price: $0.58 (58% implied probability)
- •Buy 100 contracts = $58 cost
- •Approx. fee at $0.58: ~$2.32 (4% effective)
- •If Dolphins win: receive $100, net profit = $39.68
- •If Dolphins lose: lose $58 (no fee on losing trades)
Example 2: Donalds wins Republican primary (near certainty)
- •Contract price: $0.83
- •Buy 100 contracts = $83 cost
- •Approx. fee at $0.83: ~$2.49 (3% effective)
- •If Donalds wins: net profit = $14.51 (~17.5% ROI)
Example 3: Long shot — hurricane makes landfall in Miami
- •Contract price: $0.08
- •Buy 200 contracts = $16 cost
- •Approx. fee at $0.08: ~$0.32 (very low)
- •If hurricane hits Miami: net profit = $183.68
ACH vs. Debit Card: The Deposit Fee Trap
Kalshi charges 2% on debit card deposits. ACH (bank transfer) deposits are free. On a $500 deposit, that's $10 lost before you make a single trade.
Rule: Always deposit via ACH. It takes 1–3 business days to clear, but the 2% saving is worth the wait for any deposit over $100.
How Kalshi Compares to Polymarket on Fees
| Fee Type | Kalshi | Polymarket (US App) |
|---|---|---|
| Trading fee | Variable ~1–4% | 0% currently |
| Deposit fee (bank) | Free | Free |
| Deposit fee (card) | 2% | Varies |
| Withdrawal fee | Free | Free |
Polymarket's US app currently charges 0% for sports — but it's still in beta and covers sports only. For politics, hurricanes, economics, and culture, Kalshi is the only option.
The Kalshi Platinum Program
In January 2026, Kalshi launched its Platinum program for high-volume traders, including branded merchandise, early access to new features, private events, and potential fee improvements for top traders. Worth investigating if you're trading $10,000+ per month.
Fee Calculator: Estimate Your Trade Cost
Net profit if you win = (Contracts × $1.00) − (Contracts × Entry Price) − Estimated Fee. Net loss if you lose = Contracts × Entry Price (no fee on losing trades).
- •For a $0.50 contract: assume ~4% fee on net profit
- •For a $0.75 contract: assume ~2.5% fee on net profit
- •For a $0.90 contract: assume ~1.5% fee on net profit
Kalshi displays the exact fee before you confirm any trade in the app. Always check this before executing.
Frequently Asked Questions
Kalshi is a CFTC-regulated event-contract exchange where you trade Yes/No on real-world outcomes — sports, politics, weather, economics — at peer-to-peer prices.
Related guides
Pillar pages
Sources & references
- 1.Commodity Futures Trading Commission — Event Contracts — CFTC.gov
- 2.CFTC Final Rule on Event Contracts — CFTC.gov
- 3.Kalshi wins court battle to offer election contracts — Reuters
- 4.National Council on Problem Gambling — 1-800-GAMBLER — NCPG
External links open in a new tab. We cite primary regulatory and major news sources where possible. Citations to trusted regulators (CFTC, SEC, IRS, NOAA, .gov, .edu) are dofollow; commercial outbound links are not endorsements.
Catie Di Stefano has spent 15 years working with online gambling across some of the most regulated and competitive gambling markets in the world.
Starting at Betsson Group in Malta in 2011, she has in recent years worked her way through VIP management, CRM, gamification and marketing leadership across European and North American operations. Catie was a licensed consultancy for Hard Rock Casino in New Jersey, where she held a DGE vendor license and owned the execution of the online CRM program from launch day in 2018.