Scalping explained: how it works and why costs weigh so heavily

In short

• Scalping means opening and closing positions within seconds to a few minutes, aiming for a small price move on each trade.
• Because you make many trades, spread, commission and slippage count heavily. Costs and execution speed often shape the result more than your analysis does.
• Scalping demands full attention, fast and reliable technology, and strict rules. It does not suit most beginners.
• Losses are a normal part of this style. A fixed stop-loss and a maximum loss per day are essential.

What is scalping?

Scalping is a form of day trading. A day trader closes positions on the same day. A scalper goes one step further and often holds a position for only seconds to a few minutes. On each trade the aim is a small price move, for example a few cents per share or a few ticks. A tick is the smallest step a price can move.

You earn little on a single trade. That is why scalpers make dozens or hundreds of trades a day. This makes the style intensive and costly. You pay costs on every trade, and they add up quickly.

How does it work?

Scalpers look for situations where the price seems to move briefly and predictably. They therefore trade mostly instruments with high liquidity. That means there is a lot of trading and you can buy and sell quickly without the price changing much.

Commonly used tools:

• Short charts, such as 1 minute or 5 minutes, with one or two simple indicators. Examples are a moving average or VWAP.
• The order book: the list of open buy and sell orders. It shows how many participants want to trade at each price level.
• Trading volume: how much is traded. See also the tutorial on volume analysis.
• Orders with a fixed exit: when you open a trade you immediately set a stop-loss and a profit target.

Common approaches

These describe how traders do it. They say nothing about the outcome.

• Pullback in a trend: the price briefly moves against the trend, and the scalper enters once it turns back in the trend direction.
• Breakout from a small range: the price leaves a narrow price area. You can read more about breakouts in our guide to breakout patterns.
• Return to the average: the price has moved quickly far from an average, and the scalper expects it to partly return.

All three can go wrong. A price can reverse immediately after you enter.

Worked example: why costs weigh so heavily

This example is made up to show the principle. The amounts are not advice.

Suppose a share has a bid of €20.00 and an ask of €20.01. The spread, the difference between the two, is therefore €0.01. You buy 500 shares with a market order at €20.01. In this example your broker charges €1.00 per order.

The gain is smaller than the loss, even though the price move was the same size. With these numbers, more than half of your trades must win to break even: €27 divided by €50 is 54%. That is an arithmetic consequence of the example, not an expectation.

Slippage comes on top. This is the difference between the price you expected and the price you got. If your order fills one cent worse, that costs €5.00 extra on 500 shares. Over a hundred trades a day this adds up fast.

Costs and execution speed matter a lot

Scalping is about margins of a few cents. Three things therefore play a large role:

• Spread. You pay it on every trade, in and out. A wide spread makes scalping almost impossible.
• Commission. A fixed amount per order weighs more the less you earn per trade. Also check whether a broker charges extra for certain exchanges or for market data. See trading costs for an explanation.
• Slippage and speed. A slow internet connection, a delayed price feed or a busy market can cause your order to fill at a worse price. A limit order gives price certainty, but your order may then not be filled.

Brokers differ in costs and in how they execute orders. Compare them yourself based on how many trades you expect to make. You can start with the comparison tool. Treat it as a starting point, not as advice.

Common mistakes

• Too many trades. Out of boredom, or to win back a loss, you trade more than your plan says. Every extra trade costs money.
• Moving or removing the stop-loss. This turns a small loss into a large one.
• Looking only at the profit per trade. Only count after costs.
• Trading around news or the market open. Spreads are wider and slippage is larger then.
• Positions that are too large. With leverage or a large position, a small price move already causes a large loss.
• Carrying on after a bad run. Losses make you impulsive. Stop at the limit you set in advance.

Risk management

Risk management is not a side issue in scalping. Set rules in advance and stick to them.

1. Risk per trade. Decide the most you are willing to lose on one trade, for example a small percentage of your account. Calculate it with the risk-per-trade tool.
2. Position size. This follows from your risk amount and the distance to your stop-loss. Use the position size calculator.
3. Stop-loss. Set it as soon as you open the trade. A stop-loss gives no certainty about the execution price: in a fast price jump the fill can be worse than your stop.
4. Maximum loss per day. Choose a limit, for example a fixed amount or a percentage. If you reach it, you stop for the day.
5. Record keeping. Note every trade, including costs, in a trading journal. This shows what you actually keep.

You can read more about the basics in our tutorial on risk management.

Is scalping for beginners?

For most beginners it is not. There are three reasons:

• You must decide quickly under time pressure. That is hard while you are still learning the basics.
• Costs weigh heavily. A small mistake in your plan or your cost calculation makes the whole result negative.
• It requires reliable technology and a lot of screen time.

If you still want to try, start by practising without real money in a demo environment. Read the tutorial on paper trading. Include spread, commission and slippage in your practice results. Practice results are often better than reality, because a demo environment does not reproduce all execution problems.

Summary

• Scalping is many short trades for small price moves.
• Spread, commission and slippage count on every trade. Because of the number of trades, they often decide the result.
• Always use a stop-loss, a fixed position size and a maximum loss per day.
• For most beginners this style is unsuitable. Practise without real money first.

This article is educational and not investment advice. Trading involves risk, and you can lose all or part of your money.