Slippage is the difference between the price you expected when you placed an order and the price at which the order actually filled. It can work in your favour or against you, although traders usually notice it most when it increases a loss or reduces a profit. Slippage is a normal part of trading in fast-moving markets, because prices change between the moment you click and the moment your broker executes the order. It is not always a sign of a bad broker, but repeated large slippage is worth investigating. Understanding when slippage happens helps you choose better order types, better timing, and more realistic expectations for every trade.

The main cause of slippage is volatility combined with limited liquidity at a specific price. When major news is released, such as interest rate decisions or employment data, prices can jump several pips in a second and there may be few orders available at your requested price. Your market order then fills at the next available price, which can be several pips away. Slippage also occurs at market opens, especially on Monday after weekend news, when gaps appear between Friday's close and Monday's open. Low-liquidity pairs and exotic currencies are more vulnerable, because fewer buyers and sellers are present to absorb large orders at stable prices.

Stop-loss orders deserve special attention, because slippage can make a loss larger than planned. A stop loss becomes a market order once its price is reached, so in a fast gap it may fill well beyond the stop level. This is different from a guaranteed stop, which some brokers offer for an extra fee and which promises execution at the requested level under stated conditions. Beginners should read their broker's terms carefully to understand whether stops are guaranteed, how slippage is handled, and what happens during gaps. Knowing this in advance prevents shock when a weekend gap moves through a stop and the fill is worse than the chart suggested.

You can reduce slippage by choosing order types deliberately. Limit orders, which only fill at your price or better, protect you from bad fills on entries, although they may not fill at all if price moves away. For exits, a limit order at your take-profit level works similarly. Market orders are useful when speed matters more than exact price, but they carry the highest slippage risk during news. Avoid placing market orders seconds before a major release unless your strategy specifically requires it. If you trade news, consider smaller position sizes, wider awareness of spreads, and a clear rule for when you will simply stay out.

Timing and pair selection also matter. Trading major pairs during the London and New York overlap usually offers deeper liquidity and tighter spreads than trading thin pairs late at night. Check the spread before entering, because a widened spread during news or low liquidity is an early warning that slippage risk is high. Some platforms show depth or recent fill quality, and keeping a record of your own fills can reveal patterns. If slippage is consistently large on one pair or at one time of day, adjust your schedule or your pair list rather than accepting the cost silently. Small improvements here compound over many trades.

Broker choice and connection quality play a supporting role. A broker with access to multiple liquidity providers may fill orders more smoothly than one with a single source, although no broker can eliminate slippage in extreme moves. Use a stable internet connection and a platform that confirms fills quickly, and avoid trading from an unreliable mobile connection during volatile events. If you suspect abnormal slippage, compare your fills with the chart, save order history screenshots, and ask the broker for an explanation with trade IDs. A transparent broker should be able to explain fills clearly, while vague answers are a reason to reconsider the relationship.

Finally, build slippage into your planning instead of treating it as a surprise. When backtesting, add a small allowance for slippage and spread so your results are not unrealistically optimistic. When setting stops, remember that a gap can exceed the stop, so avoid risking an amount that would be unacceptable if the fill were worse. Keep position sizes modest around news, and review slippage monthly alongside spreads and commissions as part of your total trading cost. You cannot remove slippage completely, but you can choose when to accept it, limit how often you face it, and keep it from turning a reasonable plan into an unexpected loss.