Slippage occurs when your order executes at a different price than expected. You click buy at 1.1000, but your trade fills at 1.1003. That 3-pip difference is slippage. Understanding why it happens helps you manage its impact.
How Slippage Works
When you place an order, your broker sends it to the market. Between the time you click and the trade executes, the price may change:
- You see EUR/USD at 1.1000 and click buy
- Your order travels to the broker's server
- The broker routes it to a liquidity provider
- In those milliseconds, price moves to 1.1002
- Your order fills at 1.1002, not 1.1000
You experienced 2 pips of negative slippage.
Positive vs. Negative Slippage
Slippage can work for or against you:
Negative Slippage:
- Buy order fills higher than expected
- Sell order fills lower than expected
- You start at a worse position
Positive Slippage:
- Buy order fills lower than expected
- Sell order fills higher than expected
- You start at a better position
Positive slippage happens but is less commonly discussed.
Why Slippage Happens
Market Volatility
During fast-moving markets, prices change rapidly. By the time your order reaches the market, the price you saw no longer exists.
High-volatility situations:
- Major news releases (NFP, FOMC)
- Economic surprises
- Geopolitical events
- Central bank announcements
Low Liquidity
When fewer buyers and sellers exist, your order might not find a match at your desired price:
- Off-hours trading (Asian session for EUR/USD)
- Exotic currency pairs
- Holiday periods
- Market gaps
Large Orders
Big positions may exceed available liquidity at one price level. The order fills partially at several prices, creating average slippage.
Execution Speed
Slow broker technology or internet connection increases the gap between your click and execution.
Where Slippage Occurs Most
Market Orders
Market orders execute at the best available price—not necessarily the displayed price. Slippage is common with market orders during volatility.
Stop Loss Orders
Stop losses become market orders when triggered. During gaps or fast moves, your stop might fill much worse than intended:
- Stop loss set at 1.1000
- Price gaps from 1.1010 to 1.0980
- Your stop fills at 1.0980, not 1.1000
- 20 pips more loss than planned
Stop Entry Orders
Orders set to enter on breakouts face similar issues during fast moves.
How to Minimize Slippage
Stay Out Around Major News: no new position from 30 minutes before to 30 minutes after NFP, FOMC or other high-impact releases.
Trade Liquid Pairs: Major pairs like EUR/USD have tighter markets with less slippage.
Trade During Active Sessions: London and New York sessions have the best liquidity.
Use Limit Orders: Limit orders only fill at your price or better, eliminating negative slippage (though they might not fill at all).
Choose Quality Brokers: ECN brokers with strong liquidity providers offer better execution.
Check Execution Statistics: Some brokers publish their average execution speed and slippage statistics.
Slippage and Stop Losses
A critical consideration for risk management:
Your Plan:
- Entry: 1.1000
- Stop Loss: 1.0950 (50 pips risk)
- Risk: $500 on a standard lot
What Might Happen:
- Market gaps during news
- Stop fills at 1.0920 (80 pips)
- Actual loss: $800
This is why you should never risk money you can't afford to lose and remember that a wider stop in volatile periods means a smaller position at the same 1% risk.
Guaranteed Stop Losses
Some brokers offer guaranteed stop losses (GSLO):
How They Work:
- Pay a premium for the guarantee
- Stop fills at exactly your price, regardless of gaps
- Extra cost but eliminates slippage risk
When to Consider:
- Trading through high-risk events
- Small accounts where extra slippage is devastating
- Peace of mind in volatile markets
Realistic Expectations
Some slippage is normal and unavoidable:
| Conditions | Expected Slippage |
|---|---|
| Normal market, major pair | 0-1 pip |
| Active session | 0-1 pip |
| Minor news | 1-3 pips |
| Major news | 3-10+ pips |
| Gap situations | Unlimited |
Factor expected slippage into your trade planning.
Key Takeaways
- Slippage is the difference between expected and actual execution price
- It occurs due to volatility, low liquidity, and execution delays
- Stop losses can slip significantly during gaps
- Trade liquid pairs during active hours to minimize slippage
- Use limit orders when precise entry is critical
- Consider guaranteed stops for high-risk situations
What's Next?
Learn about forex order types and how different orders can help you manage slippage and execution.
This article is for educational purposes only and does not constitute financial advice.