28 July 2026

Trading Slippage Explained: Why Your Order Fills at a Different Price

What Is Trading Slippage?

Slippage in trading refers to the difference between the price a trader expects when placing an order and the actual price at which the order is executed, occurring when market conditions prevent an order from being filled at the exact requested level. Slippage occurs when there is a difference between the expected price and the actual execution price of a trade, often due to market volatility or liquidity issues.

For example, you might see a bid-ask price of 100.00 / 100.10 on your screen and place a buy order at 100.10. But by the time your order reaches the exchange—even milliseconds later—the price has moved. You end up filling at 100.25 instead. That 0.15-point difference is slippage, and it eats directly into your trading costs before you've even realized the trade closed.

When Does Slippage Occur?

Slippage usually occurs during periods of high volatility or low liquidity, particularly when using market orders, and is more likely if the trade size exceeds the available volume at the requested price. The phenomenon is most common during periods of high volatility—such as major economic announcements, earnings releases, or unexpected geopolitical events—when prices can move rapidly in a short span of time, and can also occur in thinly traded markets where liquidity is limited.

Slippage is an uncontrollable price change during execution, while the spread is just the cost of entering/exiting a trade. Understanding this distinction helps you see slippage as a separate cost from the bid-ask spread itself. Both can hurt your bottom line, but they work differently. The spread is fixed and visible; slippage is dynamic and only reveals itself after execution.

How to Reduce Slippage Risk

While slippage is a normal part of trading and is not completely avoidable, there are a few ways you can minimize your risk of slippage in trading.

Use limit orders. Limit orders are instructions to execute a position at a price that is more favorable than the current market price, so your order will be filled at the specified price or better, meaning slippage doesn't apply. The tradeoff is that your order may not fill at all if the market moves away from your price.

Set slippage tolerance. Slippage tolerance is a setting in trading platforms that allows you to determine how much price slippage you're willing to accept so that your order can be executed; if the market does slip and you haven't set a price tolerance, your broker will just accept the next available market price, but setting a price tolerance means that you can limit this difference, giving you more control over your risk.

Avoid high-impact events. You could avoid large market-moving events, opt to trade on lower volatility markets or those with higher liquidity. Economic calendars can help you see when major data releases are scheduled.

Choose an execution-focused broker. A broker's execution speed significantly impacts slippage, with faster execution helping to minimize its effects. Brokers vary widely in how quickly orders reach the market and how efficiently they route them to liquidity.

The Real Cost of Slippage

Slippage compounds over time. A single trade losing a few pips might seem harmless, but across hundreds of trades, that "implementation shortfall" becomes a meaningful performance drag. Some traders also compare their expected fill levels with their actual ones on a regular basis; if the difference starts creeping wider, you know something's off. Tracking your average slippage helps you spot whether your broker's execution is deteriorating or whether market conditions have simply become more volatile.

Understanding slippage is part of evaluating a broker's true cost to you. Commission and spreads are explicit; slippage is implicit but just as real.

Sources

Analysis, not investment advice.

General education, not investment advice. Not a recommendation to buy, sell, or hold any security or use any specific broker.