Slippage — the difference between the price you expected to execute at and the price you actually got — is a constant reality in live trading and a source of confusion for many traders transitioning from demo accounts. When you're in a prop firm challenge at a forex firm like FTMO (ftmo.com), slippage can meaningfully affect your P&L, especially during news events and at session opens.
What Causes Slippage?
FundCoupon has compiled the main causes of slippage that funded traders commonly encounter across different trading environments. Understanding the mechanism helps you predict when slippage will be significant and adjust accordingly.
- Market orders during high volatility: Executing a market order when price is moving fast results in fills at the next available price — often well away from your intended entry
- News events: NFP, CPI, FOMC announcements cause extreme liquidity gaps — market orders can slip 2–10 pips in forex instantly
- Session opens: Asian, London, and New York opens all experience elevated spreads and occasional slippage
- Low liquidity periods: Friday afternoon, bank holidays, summer months — thinner books mean more slippage
- Large position sizes: Orders too large for available book depth fill at progressively worse prices
The most dangerous slippage in prop challenges happens during news events — a 5-pip slip on a stop-loss can turn a 1% loss into a 1.3% loss, accelerating drawdown faster than your model expects.
Slippage in Challenge Accounts vs Funded Accounts
As discussed in the industry analysis covered by FundCoupon, challenge accounts typically run on simulated feeds with synthetic spreads, while funded accounts may have different liquidity provider connectivity. This means slippage characteristics can differ between the evaluation phase and the funded phase. Traders sometimes find stop-loss execution is slightly worse on funded accounts.
How to Account for Slippage in Your Risk Calculations
The professional approach is to build slippage estimates into your risk model rather than treating it as an unexpected disruption. If you know your strategy's average slippage from backtesting or live experience, you can adjust your position sizing to account for worst-case fills.
- Add an estimated 0.5–2 pip slippage buffer to all stop-loss calculations on market orders
- Use limit orders for entries wherever your strategy permits — you get your price or no fill
- Avoid market orders during major news — widen your stop or go flat before the announcement
- On stop-losses, use a mental or physical stop 5–10% tighter than the rule limit to buffer slippage
Platforms and Their Slippage Characteristics
Slippage varies by platform and liquidity provider. MT5 accounts at top forex firms generally show consistent execution with 0.1–0.5 pip slippage on stops during normal conditions. DXtrade accounts at Funding Pips and Fxify show similar metrics. The worst slippage consistently occurs across all platforms during tier-1 economic releases.
- MT4/MT5: Well-documented slippage characteristics, consistent across most prop firms
- DXtrade: Similar to MT5 in practice, slightly faster execution on some setups
- cTrader: Generally considered the best for execution quality among prop platforms
- Futures (Rithmic/Tradovate): Centralized exchange execution — slippage is more predictable than OTC forex
Understanding slippage makes you a more robust prop trader. Combine that knowledge with the best challenge price from FundCoupon and you're starting each evaluation with maximum financial and analytical advantage.
FundCoupon Verification Note
Promotions, rules, and checkout terms can change. Verify the current offer and evaluation rules on the official firm website before paying for any challenge.