What Is Slippage In Trading?
What Is Slippage In Trading?
Slippage is the difference between the price a trader expects and the price the order actually receives. It can be positive or negative, but for active traders it is one of the most important signs of real execution quality.
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Quick Verdict
Slippage is what happens when the price you expect is not the price you actually receive. It is one of the most important hidden trading costs because it can turn a good setup into a worse trade before the position has even started.
Slippage is not automatically evidence of broker wrongdoing. It can happen naturally when markets move quickly, liquidity disappears, spreads widen or an order has to be filled at the next available price.
The GradTraders view is that slippage should be treated as part of execution quality. A trader should ask: how often does it happen, when does it happen, is it mostly negative, and does it make sense for the market conditions at the time?
Slippage Meaning In Trading
Slippage is the difference between the price you intended to trade and the price you actually got. If you click buy at 100.00 and your trade fills at 100.05, you have experienced negative slippage of 0.05. If you click buy at 100.00 and your trade fills at 99.98, you have experienced positive slippage.
Slippage matters most when a trader uses market orders, stop orders or trades during fast conditions. In those situations, the order is trying to get filled, but the available price may change before the broker or execution venue completes the trade.
For short-term traders, slippage can be more damaging than the visible spread because it affects both entry and exit. A strategy that looks profitable on a chart can become much weaker if the live fills are consistently worse than expected.
Positive Slippage vs Negative Slippage
Positive Slippage
Positive slippage happens when your order is filled at a better price than expected. For example, you try to buy at 100.00 but get filled at 99.95. It is less discussed because traders rarely complain when a fill improves.
Negative Slippage
Negative slippage happens when your order is filled at a worse price than expected. For example, you try to buy at 100.00 but get filled at 100.05. This is the kind of slippage traders usually notice.
A fair execution environment can include both positive and negative slippage. What traders should be careful about is a pattern where slippage appears heavily one-sided against the trader without a clear market explanation.
Why Slippage Happens
| Cause | What Happens | Trader Impact |
|---|---|---|
| Fast markets | The price changes between the moment the order is sent and the moment it is filled. | Entries and exits can be worse than expected, especially around momentum moves. |
| News events | Liquidity can thin out and prices can jump sharply after major economic releases or market shocks. | Stops may fill beyond the planned level and market orders may receive poor fills. |
| Low liquidity | There may not be enough volume available at the visible price. | Larger orders may be filled across multiple prices or at the next available quote. |
| Market gaps | The market reopens away from the previous price, often after weekends, holidays or overnight events. | Stops can trigger far away from the level shown before the gap. |
| Execution route | Platform, bridge, broker server and liquidity route all affect how quickly and reliably orders are handled. | A weaker route can increase the chance of stale prices, rejected orders or worse fills. |
Slippage And Broker Execution Quality
Slippage sits inside the wider topic of broker execution quality. A good broker is not only about having a low spread. The broker also needs to handle orders fairly, quickly and consistently under real market conditions.
UK best-execution rules recognise that execution is not judged on price alone. FCA rules refer to execution factors such as price, costs, speed, likelihood of execution and settlement, size, nature and other relevant considerations. For retail clients, the “best possible result” is usually assessed in terms of total consideration, including price and execution-related costs.
This matters because a broker with slightly wider spreads but more reliable execution can sometimes be better than a broker with headline-tight spreads but poor fills. For active traders, the combination of spread, commission and slippage matters more than any single marketing number.
Where Slippage Fits In The GradTraders Broker Bank
GradTraders treats slippage as part of the real trading-cost picture. It belongs next to spreads, commissions, swaps, overnight funding, order execution, platform route, regulation and broker entity.
This is why a broker review should not stop at the advertised spread. Traders need to know how the broker behaves when the market is moving, when the order size is larger, when spreads widen, when news hits and when stop orders are triggered.
Slippage is especially relevant when comparing active-trader brokers, raw spread accounts, cTrader routes, TradingView-connected accounts and high-leverage CFD brokers.
How Different Order Types Affect Slippage
Market Orders
Market orders prioritise getting filled. They are the most exposed to slippage because the trader accepts the next available price rather than a fixed price.
Limit Orders
Limit orders prioritise price. They can reduce negative slippage because the order should not fill beyond the limit price, but the trade may not execute at all.
Stop Orders
Stop orders can become market-style orders when triggered. In fast or gapping markets, this can create slippage beyond the stop level.
Slippage Is Normal, But Patterns Matter
A single bad fill during a volatile market does not prove anything by itself. Markets can move quickly, and prices shown on a screen are not always guaranteed execution prices.
What matters is the pattern. If slippage is repeatedly negative, appears during quiet conditions, affects exits more than entries, or is much worse than comparable trading environments, the trader should investigate the broker, account type, entity and execution policy.
How Traders Can Reduce Slippage
- Avoid placing market orders during major scheduled news if the strategy does not require it.
- Use limit orders when price control matters more than guaranteed execution.
- Be careful with stop orders around market opens, weekend closes and illiquid sessions.
- Trade liquid instruments where there is usually more depth at the quoted price.
- Keep position size realistic so the order is not too large for the available liquidity.
- Compare live execution quality, not just advertised spreads.
- Keep records of fills, timestamps, spread at entry, platform, account type and market conditions.
Final Verdict
Slippage is one of the key differences between chart trading and real trading. A backtest or screenshot may show an entry price, but the live account has to deal with speed, liquidity, spread movement and execution route.
The GradTraders verdict is this: do not panic about every instance of slippage, but do measure it. If slippage is frequent, asymmetric or out of line with market conditions, it becomes a serious broker-quality issue.
Source note: this article is based on GradTraders broker research, the public 24-broker comparison table, FCA best-execution rules and GradTraders editorial judgement. It does not rely on competitor broker review websites.
Useful checks: GradTraders 24-Broker Table · FCA COBS 11 best execution rules · How We Review.
What Is Slippage In Trading? FAQ
What is slippage in trading?
Slippage is the difference between the price a trader expects and the price at which the order is actually filled.
Is slippage always bad?
No. Slippage can be negative or positive. Negative slippage gives a worse fill than expected, while positive slippage gives a better fill.
Why does slippage happen?
Slippage usually happens because prices move between order submission and execution, especially during news, high volatility, low liquidity, market opens, gaps or fast-moving markets.
Can slippage be avoided completely?
No. It can be reduced by using suitable order types, avoiding major news, trading liquid markets and using a broker with reliable execution, but it cannot be eliminated completely.
Does slippage mean a broker is cheating?
Not automatically. Slippage is normal in fast markets. The concern is repeated, unexplained or one-sided slippage that appears inconsistent with market conditions.