Why Traders Must Understand Slippage and How to Reduce Its Impact on Profits

Many traders experience the problem where they intend to enter an order at 1.1000, but when the order is actually executed they get a price of 1.1003, or they set a stop loss at 1.0950 but the order is closed at 1.0945. This small difference is called "Slippage", and although it may seem like only a few pips, when accumulated over the long term, slippage can erode your profits significantly, especially for traders who trade frequently or use scalping strategies. This article will explain what slippage is, what causes it, and most importantly, how to reduce its impact—methods that every trader should apply.

What Is Slippage and How Does It Occur?

Slippage is the difference between the price you expect or intend to enter an order at and the price at which your order is actually executed in the market. For example, you press the Buy button at a price of 1.2000, but because the market is moving very quickly, your order may be filled at 1.2003, putting you at a disadvantage of 3 pips from the start.

Slippage can occur for several main reasons, including:

• Market Volatility: During periods when important news is released, such as interest rate announcements, Non-Farm Payroll, or political events, prices can move dozens of pips in a fraction of a second, making slippage easy to occur.
• Low Liquidity: During times when market trading is low, such as late at night or on holidays, some currency pairs may have few buyers and sellers, causing spreads to widen and slippage to occur more easily.
• Execution Speed: Some brokers or servers may have delays in sending orders to the market, causing prices to change before the order is filled.
• Order Type: Market Orders tend to have more slippage than Limit Orders because Market Orders execute immediately at the current market price, whatever that price may be.

The Impact of Slippage on Profits That Traders Often Overlook

Many people think that 2-3 pips of slippage per trade is not a big deal, but when calculated over the long term, the numbers are higher than you might think. Suppose you trade 100 times per month and lose an average of 2 pips in slippage per trade—that's 200 pips per month, or 2,400 pips per year. If you trade one standard lot (pip value approximately $10), that means you lose $2,000 per year from slippage alone.

For traders who use scalping or day trading strategies that trade frequently and aim for only a few pips of profit per trade, slippage can turn a strategy that should be profitable into a losing one. For example, if your strategy aims for 5 pips profit per trade but you lose 2 pips in slippage both on entry and exit, that means your net profit is only 1 pip, which may not be worth the risk and time invested.

Additionally, slippage also affects your Risk-Reward Ratio. If you plan to trade with 10 pips of risk to aim for 20 pips of profit (1:2), but slippage increases your risk to 12 pips and reduces your profit to 18 pips, your ratio changes to 1:1.5, which affects the expectancy of your trading system in the long run.

How to Measure and Monitor Slippage in Your Trading

Before you can reduce slippage, you need to know how much slippage you're losing first. The best way to measure is to keep detailed trading records, logging the following information:

• The price you intended to enter the order at
• The price at which the order was actually executed
• The difference in pips
• The time you entered the order and the market conditions at that time

If you use MT5 and connect to Thaifxbook, you will get very detailed trading statistics, which can help analyse which orders have more slippage than usual and under what market conditions they occur. Having clear data will help you improve your trading plan and make better decisions.

Additionally, you should calculate average slippage per month and compare it to total profits. If slippage erodes more than 10-15% of your profits, that's a sign that you need to take serious corrective action.

Techniques to Reduce Slippage That Traders Should Apply

Choose a Quality Broker with Fast Execution

A good broker will have a fast execution system and high liquidity. Choosing a broker with ECN or STP execution typically provides lower slippage than market maker brokers. Additionally, you should choose a broker with servers close to where you are or with quality VPS to reduce delays in sending orders.

Avoid Trading During Major News Events

If you're not a trader who specialises in news trading, you should avoid trading 15-30 minutes before and after major news events such as Non-Farm Payroll, interest rate announcements, or GDP, because slippage during these periods can be as high as 10-20 pips or more.

Use Limit Orders Instead of Market Orders When Possible

Limit Orders allow you to control the price at which you enter an order better. Although there is a risk that the order may not be filled, if it is filled you will get the price you want or better, which significantly reduces slippage.

Trade During Times of High Liquidity

The period when the European and American markets overlap (approximately 20:00-24:00 Thai time) typically has the highest liquidity, narrow spreads, and low slippage. Avoid trading late at night or during periods of low market activity.

Adjust Your Strategy to Account for Slippage

If you find that your average slippage is 2 pips per trade, you should incorporate this figure into the expectancy of your trading system and adjust your take profit targets high enough to cover slippage. For example, if you previously set a target of 10 pips, you may need to increase it to 12-13 pips to achieve the original net profit target.

Test and Compare Brokers

If you suspect your current broker is giving you excessive slippage, try opening demo accounts with other brokers and trade with the same strategy, then compare average slippage. Having comparative data will help you make an informed decision about changing brokers.

Slippage from a Long-Term Risk Management Perspective

Reducing slippage is not just about saving a few pips, but is part of good risk management. Professional traders calculate all trading costs including spread, commission, and slippage into their position sizing and trading planning.

Keeping records and monitoring slippage regularly will help you see the overall picture of your true trading costs and enable you to improve your strategy for greater efficiency. If you use Thaifxbook to keep statistics, you will be able to see these insights clearly and use them to make better strategic decisions.

Additionally, understanding and managing slippage also helps you have better trading psychology, because you won't feel frustrated or surprised when the price you get doesn't match what you intended, but will understand that it's part of the trading costs that need to be managed.

Summary

Slippage is a factor that many traders overlook, but it can erode profits significantly in the long term. Understanding what causes slippage, how to measure its impact, and techniques to reduce slippage will help you become a more efficient trader. Choosing a good broker, avoiding major news events, using Limit Orders when possible, and trading during times of high liquidity are all methods that help reduce slippage. Most importantly, keep records and monitor statistics regularly so that you have clear data to improve your strategy and increase profits sustainably in the long term.