Risk Management5 min read
What Is a Stop Loss? Placement, Types and Common Mistakes
A stop loss is an instruction to close a position automatically once price reaches a specified level. Its purpose is to convert an open-ended loss into a known, capped one before the trade begins.
On an account with a drawdown limit, trading without one is not a style choice. A single unstopped position in a fast market can end an account that took weeks to build.
Place stops at invalidation, not at a dollar amount
The stop belongs at the price where your reason for the trade stops being true. If you are long because a support zone is holding, the stop goes below that zone. If you are long because structure is bullish, it goes below the swing low that would break structure.
Choosing the stop first and then calculating size is the correct order. Choosing a comfortable loss amount and then placing the stop that distance away puts it wherever the arithmetic lands — usually inside the noise, where it gets hit on a routine wick while the idea remains valid.
Stop types
A market stop triggers a market order at your level; it always fills but may slip in fast conditions. A stop-limit triggers a limit order, which controls the price but may not fill at all in a gap — leaving you in a losing position with no protection.
For risk control, a market stop is the safer default. The point of a stop is certainty of exit, and a stop-limit trades that certainty away for a slightly better price.
- Market stop — guaranteed exit, possible slippage
- Stop-limit — price control, risk of no fill
- Trailing stop — follows price by a fixed distance to lock in gains
- Time stop — exit if the trade has not worked within a set period
The most expensive habit
Moving a stop further away as price approaches it converts a planned, sized loss into an unplanned one. It is also the moment your risk calculation becomes fiction: the position was sized for the original distance.
The habit is self-reinforcing because it often works. Price comes back, the trade recovers, and the behaviour is rewarded. It works until the one occasion it does not, and that occasion costs more than every rescue combined. Stops may be tightened or moved to breakeven; they should never be widened.
Slippage and gaps
A stop is a trigger, not a guarantee of price. In fast markets — major news, thin liquidity, a weekend gap — the fill can be materially worse than the level.
This is why avoiding holding size through scheduled high-impact events matters more than any stop setting. The protection you think you have is only as good as the liquidity available at the moment it triggers.
Frequently asked questions
Where should I place my stop loss?
At the price where your reason for entering is proven wrong — beyond the level, swing point, or zone your trade depends on — plus a small volatility buffer so ordinary noise does not trigger it. Then size the position to that distance.
Should I ever move my stop loss?
Tighten it or move it to breakeven, yes. Widen it, no. Widening breaks the position sizing the trade was built on and turns a planned loss into an unplanned one.
Can I trade without a stop loss?
Not safely on an account with a drawdown limit. A single fast move against an unprotected position can breach the daily or maximum limit and end the account in one trade.
Related guides
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ReadTrade it on a funded account
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