Slippage In Trading, Why It Happens and What to Do About It

In financial markets, whether equities, foreign exchange, or commodities, traders often notice a gap between an order’s expected price and its final execution price. This difference is called slippage.

Slippage is a natural part of electronic trading. But if execution costs aren’t managed, they can cut into profits and complicate risk management.

What Is Slippage in Trading?

Slippage occurs in the brief moments after you place an order, but before a counterparty or liquidity provider can execute it. Market prices fluctuate, so if bid or ask quotes change during this brief period, the trade will be filled at the next available price.

Slippage can be negative, meaning you pay more when buying, or get less when selling. It can also be positive, giving you a better execution price than you expected. Negative slippage is much more common, which is why it gets most of the focus.

What Causes Slippage?

Slippage mainly happens because of high market volatility, limited liquidity, and how big your order is compared to the market’s depth.

During big events, such as news releases or market openings, prices can move rapidly before an order is processed. In less liquid markets, or with larger orders, the available volume at the best price might get depleted. This means the rest of the order has to fill at less favorable prices.

Market orders aim for immediate execution, so they’re more prone to slippage. Limit orders, however, let you set a maximum or minimum acceptable price. While these prevent negative slippage, there’s a chance your order might not get filled at all.

Why Slippage Matters

Small amounts of slippage really add up. Picture a forex strategy aiming for a 10-pip profit; if average slippage hits two pips per round trip, that cuts the expected edge by 20%.

This effect becomes much more pronounced across many trades. It also messes with risk management. A stop-loss order, for instance, might fill at a far worse price than planned during high volatility, increasing potential losses.

In automated and high-frequency trading, failing to account for slippage often means real-world results won’t match back-tested profitability.

Dealing With Slippage

You can’t get rid of slippage completely, but you can manage it. Traders often use limit orders to set a firm price, knowing the order might not fill.

Some platforms let users define a maximum acceptable slippage. If the price goes past that point, the order cancels automatically.

To help reduce slippage, trade liquid instruments with tight spreads, avoid major news events, and manage position sizes relative to market depth.

Choosing top brokers who offer transparent execution data and deep liquidity also matters. Reviewing their slippage reports helps set realistic trading expectations.