All-In Trade Cost Calculator

Do prediction markets charge fees on losing trades?

Kalshi and Polymarket charge taker fees only when you enter a trade on winning-side contracts. If your market resolves against you, you lose your stake but pay no additional fee. PredictIt charges its 10% profit fee only on winning trades.

What is the maximum fee I can pay on Kalshi?

Kalshi's fee peaks at 1.75¢ per contract at a 50¢ market price (50% probability). At more extreme prices — say 10¢ or 90¢ — the fee drops significantly because the probability-weighted formula reduces toward zero at the extremes.

Why does Polymarket have different fees for different market types?

Polymarket introduced category-specific fees in early 2026 to balance liquidity incentives across market types. High-volatility categories like crypto carry higher fee rates. Geopolitical and world-events markets remain fee-free.

Does it cost money to deposit into Kalshi or Polymarket?

ACH and wire deposits on Kalshi are free. Debit card and Apple Pay deposits carry a fee of up to 2%. Polymarket uses USDC on the Polygon network — there are no Polymarket platform fees to deposit or withdraw, but Polygon gas fees of approximately $0.01–$0.05 apply.

How does the PredictIt withdrawal fee compound with the profit fee?

PredictIt applies the 10% profit fee first, then the 5% withdrawal fee to the remaining net proceeds. So if you invest $50 at 65¢ and win: gross payout is $76.92, the 10% profit fee on $26.92 profit is $2.69, leaving $74.23 in net proceeds. The 5% withdrawal fee on $74.23 is $3.71, leaving you $70.52 net.

Are these fees the same for every market on the platform?

Not always. Kalshi has specific series with different fee multipliers — some markets use a reduced multiplier, lowering the effective fee. Polymarket fees apply only to markets with fees enabled; pre-existing markets may be fee-free. Always check the specific market's fee schedule.

Where can I confirm current fee rates before I trade?

Kalshi publishes its official fee schedule at kalshi.com/fee-schedule. Polymarket publishes its fee structure at docs.polymarket.com/trading/fees. PredictIt fee terms are available at predictit.org/fees. Always verify at the primary source before trading.