Stop-Loss
Risk ManagementSource review:
According to Vigil's prop trading glossary, Stop-Loss is a pre-set order to close a position at a specified price to limit losses. In prop trading, stop-losses are not optional -- trading without them means a single adverse move could breach drawdown limits and terminate the account. In prop trading, understanding stop-loss is critical because it directly affects your drawdown limits, position sizing, and whether you pass or fail an evaluation.
This term is part of the full prop firm glossary.
View in full glossaryStop-losses in prop firm trading serve a dual purpose: protecting individual trade risk and protecting account-level drawdown. Without a stop-loss, a trade can run against you indefinitely, and in fast markets, the loss can exceed your daily or overall drawdown limit before you can react.
There are several stop-loss types: fixed (set number of pips/ticks from entry), ATR-based (set based on market volatility), structure-based (placed below/above key support/resistance levels), and trailing (follows price in your favor). Structure-based stops are most popular among prop firm traders because they align with logical market levels.
The width of your stop-loss directly determines your position size (through the risk-per-trade calculation). A wider stop requires smaller position size to maintain the same dollar risk. Prop firm traders often debate tight vs wide stops -- tight stops get stopped out more frequently but allow larger position sizes, while wide stops have higher win rates but smaller position sizes.
FTMO $100K, risking 1% ($1,000). Trading EUR/USD: (A) 20-pip stop = 5 standard lots ($50/pip). (B) 50-pip stop = 2 standard lots ($20/pip). Both risk $1,000. Option A: more contracts, tighter stop, stopped out more often. Option B: fewer contracts, wider stop, survives more noise. With 1:2 R:R, Option A targets 40 pips ($2,000), Option B targets 100 pips ($2,000). Same reward, different trade characteristics.
Stop-Loss under prop firm constraints is different from retail. A 10% drawdown on a personal account is recoverable. On a funded account, it ends the account. Size accordingly.
Practical example across firms: FTMO: 2-step, static drawdown, 5% daily loss, from €155. TopStep: 1-step, trailing drawdown, 2% daily loss, from $49.
Common mistake: The most common mistake with stop-loss: using retail position sizing on a funded account. Prop accounts have hard breach levels that personal accounts do not. Size so your worst-case losing streak stays inside the drawdown limit.
Reviewed | Rules verified against official firm websites