The price on your screen said 1.2450. You clicked buy. The confirmation came back at 1.2463. You did not misread it – the trade executed, but at a price you never agreed to. That difference has a name: slippage.

It is not a glitch and it is not your broker taking your money. It is a structural feature of how financial markets execute orders, and once you understand why it happens, you have a much clearer picture of how to minimise it.

What Is Slippage in Trading?

Slippage in trading is the difference between the price you expected when you placed an order and the actual price at which the trade is executed. It occurs because financial markets move continuously, and in the time between you clicking “buy” or “sell” and the order being processed, the price can shift.

Slippage is calculated simply: Slippage = Execution price minus Expected price. If you expected to buy at 1.2450 and were filled at 1.2463, your slippage is 13 pips. If you expected to sell at 1.2450 and were filled at 1.2438, your slippage is 12 pips in the wrong direction.

Slippage can happen across all timeframes, but it is most acutely felt by traders using market orders on fast-moving or thinly-traded instruments. Understanding it is part of building a complete picture of trading costs – and like any cost, it can be managed once you know where it comes from. The strategies in this article are educational tools to help you think about order placement, not personalised financial advice.

What Causes Slippage to Occur?

The most important thing to understand about slippage is that some order types invite it by design. When you place a market order – an instruction to buy or sell immediately at the best available price – you are not specifying a price. You are telling the market: execute this now, whatever the cost. The broker finds the next available market price and fills you there. In calm, liquid conditions, that price is usually close to what you saw on screen. In volatile or thinly-traded conditions, it may not be.

The order type you use determines how much exposure to slippage you accept before you even place the trade. A market order hands the price decision to the market. A limit order, which we will come to shortly, takes it back.

High volatility is the second major cause. When price is moving quickly, the gap between the expected price and the execution price widens because the market is repricing faster than orders can be matched. Low market liquidity has the same effect from a different direction: if there are few buyers or sellers at your price level, the broker fills your order against the next available counterparty, which may be at a worse price.

Major announcements are where slippage can be most severe. Central bank decisions, employment reports, and earnings releases can cause sudden price gaps – moments where the market jumps from one price level to another with no trading in between. A market order placed just before a major central bank announcement can be filled far from the expected price, because the market gaps through the level you were targeting.

Consider what happened to a trader named Sophie in early 2024. She had been watching GBP/USD ahead of a Bank of England interest rate decision and had set a market order to buy at 1.2680, expecting a bullish reaction to the announcement. The decision was more hawkish than forecast, and the market spiked sharply. Her order was executed at 1.2714 – 34 pips above where she intended to enter. The position did eventually move in her favour, but she started 34 pips in the hole before the trade had a chance to work. She had not made an error of analysis. She had made an error of order type.

Negative Slippage and Positive Slippage

Not all slippage works against you. Negative slippage means your order was filled at a worse price than expected – you paid more to buy, or received less when selling. This is the version most traders notice because it costs them money.

Positive slippage means your order was filled at a better price than expected. If you placed a market order to buy and price briefly dipped lower before execution, you may have been filled at 1.2440 when you expected 1.2450. That ten-pip improvement is positive slippage, and it works directly in your favour.

Both are equally real. Most retail traders experience negative slippage more often because they tend to trade around events and use market orders in volatile conditions – precisely when prices are more likely to move against them between order and execution. Positive slippage tends to occur more frequently in calm, liquid markets where prices are stable during the execution window.

The key point is that slippage is not a tax. It is a price outcome, and it can go either way depending on market conditions.

How to Avoid Slippage in Trading

There are practical ways to reduce slippage and, in some cases, to avoid it almost entirely on specific order types.

The most effective tool is the limit order. A limit order instructs your broker to execute only at a specified price or better. If you place a limit order to buy at 1.2450, the order will only fill at 1.2450 or lower – never higher. This structurally prevents negative slippage on your entries, because the order simply does not execute if the market has moved away from your price. The trade-off is that your order may not fill at all if price does not reach your level, but for traders who prioritise price over immediacy, this is a favourable trade.

Avoiding major announcements is the second most impactful step you can take. The causes of slippage section above showed how quickly the market can gap during a central bank decision or economic release. If you do not have an open position, the simplest approach is to stay out of the market for the period immediately surrounding high-impact events. Economic calendars listing upcoming announcements are freely available online, and checking them before placing orders is a habit worth building.

Trading liquid assets during peak trading hours significantly reduces the risk of slippage. The forex major pairs (EUR/USD, GBP/USD, USD/JPY) during the London and New York sessions carry far more volume than exotic currency pairs or small-cap stocks traded outside core hours. More volume means more orders at more price levels, which means your order is more likely to fill at or near the expected price. Thin markets, by contrast, have gaps in the order book where your execution can jump to a significantly different price.

Guaranteed stops are worth understanding for high-volatility situations. Unlike a standard stop-loss order, which is executed at the next available market price after your stop level is triggered, a guaranteed stop ensures execution at exactly the level you set – your broker absorbs any gap. Most brokers charge a small premium for this protection, and it is worth considering when you are holding a position through a major announcement or over a weekend when markets are closed.

Practising order placement in a no-risk environment helps build the instinct to choose the right order type for the conditions. Olix Academy’s Trading Simulator lets you work through entries and exits on real historical data without exposing real capital, which is exactly the kind of repetition that turns “I know what a limit order is” into confident execution under pressure.

Which Assets Are Most Susceptible to Slippage?

Slippage does not affect all assets equally. Understanding where it tends to be worst helps you make better decisions about when and how to trade.

Forex major currency pairs are generally the least susceptible to slippage during active trading hours, because they carry the highest daily volume of any financial market. EUR/USD and GBP/USD in particular have extremely deep liquidity during the London and New York overlap. Exotic pairs such as USD/ZAR or USD/TRY are far more susceptible – lower volume and wider bid-ask spreads mean there is simply less market depth at any given price level.

Stocks present a wide spectrum. Large-cap shares in highly liquid indices (the FTSE 100, S&P 500) are generally well-buffered against slippage during exchange hours. Small-cap stocks, particularly those with low average daily volume, can experience significant slippage on even modest order sizes because there are not enough counterparties at each price level to absorb the trade cleanly.

Futures contracts are affected by slippage most acutely at the open of trading sessions and around major data releases, when order flow spikes and the market gaps to reprice. CFDs mirror the underlying market’s slippage conditions – a CFD on EUR/USD in peak hours will behave similarly to the spot forex market, while a CFD on a thinly-traded commodity will carry the same slippage risk as the underlying.

The Honest Truth About Slippage Risk

A trader decides to stop using market orders after reading about slippage. They switch to limit orders on every trade. Then one morning their limit order sits unfilled while the market moves 80 pips in exactly the direction they called. The limit order protected them from slippage and cost them the entire trade.

This is the real tension in managing slippage risk. Every tool in this article involves a genuine trade-off. Limit orders eliminate negative slippage but introduce the risk of missing the trade entirely. Avoiding announcements keeps you away from gap risk but means sitting out some of the best moves. Trading only major pairs reduces slippage risk but narrows your market opportunities. None of these are wrong choices – they are context-dependent choices that become clearer with practice.

Slippage is part of the total cost of trading, alongside spreads, commissions, and overnight financing. The traders who manage it best are not the ones who have eliminated it – that is not achievable in live markets. They are the ones who understand when each order type is appropriate, who know which market conditions amplify slippage risk, and who factor execution cost into their decision before they place the trade, not after they see the confirmation.

Building that judgment takes time. If you are at the stage where order types, execution mechanics, and risk management feel like they need to come together into a coherent approach, Olix Academy’s Beginner Trading Course covers these foundations in a structured environment with live sessions alongside professional traders. Whether a structured programme suits how you learn is worth considering before you commit to it.

The course includes hands-on practice tools and professional guidance throughout. 92% of students become profitable within their first six months of completing the programme – built on understanding the mechanics of how trades execute, not just which direction to point them.

Frequently Asked Questions

Can I completely avoid slippage?

No – slippage cannot be entirely eliminated in live markets. You can reduce it significantly by using limit orders instead of market orders, trading during peak liquidity hours, and avoiding entries immediately around major announcements. But in fast-moving markets, even limit orders carry the risk of not filling at all, and market gaps can occur without warning. Managing slippage is about minimising exposure and understanding the conditions that amplify it.

Is positive slippage good?

Yes. Positive slippage means your order was filled at a better price than you expected – lower when buying, higher when selling. It is a genuine improvement on your entry or exit and works directly in your favour. It is less common than negative slippage for most retail traders because people tend to trade around volatility, but it is real and occurs more frequently in calm, liquid conditions.

How do stop-loss orders respond to slippage?

A standard stop-loss order becomes a market order once your stop level is triggered. If the market gaps through your stop price – jumping from above it to below it without trading at that level – the order executes at the next available price, which may be significantly worse than your intended level. A guaranteed stop avoids this by ensuring execution at exactly your specified price, but brokers typically charge a premium for that protection.

What is slippage tolerance?

Slippage tolerance is most commonly used in crypto and decentralised finance (DeFi) trading. It refers to the maximum percentage difference between the expected price and the execution price that a trader is willing to accept before the transaction is cancelled. A slippage tolerance of 1% means the trade will only proceed if the execution price is within 1% of the expected price. In traditional financial markets, the equivalent concept is managed through limit orders rather than a specific tolerance setting.

How can I tell if I was affected by slippage?

Check your trade confirmation or order history on your trading platform. Every executed order will show the price at which it was filled. Compare this to the price you intended to trade at, or the price visible on screen when you placed the order. The difference is your slippage. Most brokers display execution prices clearly in their order management sections, and keeping a record of your fills alongside your intended prices is a useful habit for tracking execution quality over time.

Does slippage occur in all financial markets?

Yes. Slippage can occur in any market where orders are matched between buyers and sellers – stocks, forex, futures, CFDs, crypto, options. The degree varies significantly. Highly liquid markets with deep order books experience less slippage because there are more counterparties available at each price level. Thinly traded markets, illiquid assets, or any market during a period of very high volatility are more susceptible to slippage regardless of asset class.

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Closing

Understanding slippage changes the way you read a trade confirmation. The difference between your expected price and your execution price is not noise – it is information about the conditions your order entered, the type of order you used, and the cost structure of the market you are trading.

That information compounds over time. A trader who tracks their execution prices and recognises patterns in when slippage appears has a clearer view of their real trading costs than one who treats each fill as an isolated number. Markets do not always give you the price you see. Knowing why – and what you can do about it before the next order goes in – is what separates understanding slippage from just knowing the word.