What Is a Stop Loss, and Why It Matters More Than Your Entry

What it actually is

A stop loss is a pending instruction attached to your trade: if price reaches here, close it. The broker executes it automatically, whether you are at the screen or asleep.

Concretely: you buy gold at $2,400 an ounce and set a stop at $2,390. If price falls to $2,390 the trade closes, you lose ten dollars an ounce, and the bleeding stops there. Without a stop, price can fall to $2,350 while you sleep, and nothing halts it but a margin call.

The difference between those two outcomes is not luck. In the first you decided your maximum loss before entering. In the second you let the market decide it for you.

The three kinds you will see at your broker

It is one word, but what you pick from the platform menu is not one thing:

• Standard stop: an order to close at the first available price once your level is reached. This is the default, and it is free.
• Trailing stop: it follows price automatically at a fixed distance. If price rises it rises too; if price falls it stays put. It locks in part of a gain without you watching.
• Guaranteed stop: it promises the exact price whatever happens, even across a gap. Not every broker offers one, and it carries an extra fee per trade.

The trailing stop is useful but has a second face: in a choppy market it will take you out of a winning trade on the first ordinary pullback. And it moves toward profit only - it never travels back.

The guaranteed stop is the only one that gives you a final number, and its fee is the price of that certainty. Ask your broker whether it is available and what it costs; the answer varies a great deal between firms.

Slippage: why a stop is not a guaranteed price

A standard stop loss is not a promise of a price. It is an instruction to sell at the first available price once your level is reached.

In a quiet market the difference is negligible. But on a major news release, or at the Sunday open after a weekend, price can jump straight over your level without trading at it, and the position closes further away than planned. This is slippage. It is real and it happens to everyone.

That does not make stops useless. It means a stop limits a loss without freezing it at a guaranteed figure. Anyone promising you an absolute guarantee is selling something they do not own.

Moving the stop: once acceptable, once fatal

Moving it in the direction of profit - raising it behind a winning long to lock in part of the gain - is sound management. It is called a trailing stop.

Widening it in the direction of the loss, pushing it away because price is getting close, is the moment most accounts are lost. At that instant you have cancelled the one decision you made while calm and replaced it with a decision made while afraid.

One rule covers it: the stop moves in one direction only, toward profit. And if you find yourself wanting to widen it, the problem is not the stop - it is that your position was larger than you could carry from the start.

So where exactly does it go?

This page covered what a stop is and how it executes. Where it belongs on the chart, and how position size is chosen once it is placed, is a risk management question with its own page in this guide - and that is the page we suggest reading straight after this one.

The line that ties the two together: the distance comes from the market, the size comes from you.