Drawdown rules are the most misunderstood element of prop firm trading. Failing to understand exactly how your firm calculates drawdown is the single most common reason traders lose funded accounts they were otherwise profitable on. This guide explains every major drawdown type in plain English.
Static Drawdown vs Trailing Drawdown
A static drawdown limit is fixed from the moment you open the account and never changes. If you have a $100,000 account with a 10% static maximum drawdown, your account cannot drop below $90,000 at any point. Simple. A trailing drawdown follows your highest point. If your account grows to $110,000, your drawdown floor rises to $100,000 and stays there even if you give back profits. This is significantly more aggressive and catches many traders off guard, particularly those using scaling strategies.
Balance-Based vs Equity-Based Drawdown
Balance-based drawdown only updates when you close positions. This means open floating losses do not count toward your drawdown limit until you close the trade. Equity-based drawdown counts your real-time open position losses. If you have a $5,000 open loss on a position that is still running, that counts against your drawdown immediately under equity-based rules. Most prop firms use equity-based drawdown. Always check which method your firm uses before opening a position.
End of Day vs Real Time Trailing
Some firms including certain funded futures providers use end-of-day (EOD) trailing drawdown, which only updates at market close rather than intraday. This gives traders more breathing room during volatile sessions. However, it requires discipline around overnight positioning, since large adverse moves overnight can immediately breach your limit when markets open and the EOD calculation updates.
How to Calculate Your Safe Position Size
Take your daily loss limit in dollars (e.g. $500 on a $10,000 account with a 5% daily limit). Divide by your typical stop loss in pips multiplied by your pip value per standard lot. This gives you your maximum lot size for that session. Most professional funded traders risk 0.25-0.5% per trade, which means they need 10-20 consecutive stop losses before approaching the daily limit. Build this calculation into your trading plan before each session.
Why Some Firms Change Drawdown Rules After Purchase
This is a major red flag that our audit process specifically checks for. Firms that bury drawdown rule changes in updated terms and conditions, or that apply different rules to funded accounts than those advertised during the challenge, are violating the trust of their trader base. We maintain a running log of rule changes by firm on ResponsibleTrading so you always know what you agreed to versus what is currently applied.
