What Is a Stop Loss? The Order That Keeps One Trade From Ending You

What is a stop loss?

A stop loss is an order you place in advance that automatically closes a trade once the price reaches a level you chose. You decide, before the trade goes wrong, the maximum you are willing to lose on it. The order then does that job for you, without needing you to be watching or to make the decision in the moment.

That last part is the whole point. Deciding to cut a loss while it is happening is the hardest thing in trading, because every instinct tells you to wait for the price to come back. A stop loss takes the decision out of your hands at the one moment you are least able to make it well.

How does a stop loss work?

You attach the stop to your position at a specific price. If the market reaches that price, your broker closes the trade at the next available price. That is the small but important caveat: a stop is a trigger, not a guarantee of the exact exit price. In fast markets the fill can be slightly worse than the level you set, which is called slippage.

Here is a worked example on gold:

You now know your worst case before you enter: roughly $200. If gold falls to 4,480 the trade closes and the loss stops there. If gold rises, you keep the upside. You have capped the downside and left the upside open, which is the entire purpose.

Where should you place a stop loss?

Not at a round number, and not at whatever distance gives you the position size you want. Those are the two most common mistakes.

Place the stop where your reason for the trade would be proven wrong. If you bought because a support level held, the stop belongs just below that level, because if price breaks it your idea was incorrect and there is no reason to still be in the trade. The distance to that level then tells you how large a position you can take, not the other way round.

This is the discipline most beginners get backwards. They decide the position size first, then put the stop wherever keeps the risk comfortable, which usually means too tight. A stop placed to fit your desired size rather than the chart gets hit by normal noise and taken out of a trade that would have worked.

There is also a moving version called a trailing stop, which follows the price as the trade moves into profit and locks in gains along the way, while never moving backwards against you. It is useful for letting a winning trade run without giving all the profit back, but the principle is unchanged: you set the rule in advance and let it execute, rather than adjusting it in the moment based on how you feel.

Can a stop loss fail?

It can be filled at a worse price than you set, yes. Over a weekend gap, or in the seconds after major news, price can jump straight past your level, and the stop executes at the first price available on the other side. This is why our explainer on what the spread is matters: spreads widen violently at exactly these moments, and that widening is part of why fills slip.

What a stop loss cannot do is fail to protect you from the far larger danger, which is having no plan at all. A stop that fills 5 points worse than intended still saved you from the trader next to you who moved their stop lower "just this once" and watched a 20-point loss become a 200-point one.

Why do traders skip stop losses?

Because hope is cheaper than acceptance. Closing a losing trade means admitting the idea was wrong, and a position with no stop lets you keep believing it will come back. It usually does, often enough to reinforce the habit, until the one time it does not and takes a large share of the account with it.

Removing or widening a stop while a trade is underwater is the single most common way retail accounts are destroyed. It is also invisible in hindsight, because the winning "held on and recovered" trades are remembered and the account-ending one is blamed on bad luck. A trading journal is how you catch yourself doing it.

The professional habit is the opposite: the stop is decided before entry, sized to the plan, and left alone. At TIC, strict predefined risk limits are built into every strategy for exactly this reason, and the maximum drawdown figure you can inspect on our Myfxbook record is the visible result of never letting one trade run unchecked.