Slippage is one of those realities that catches a lot of traders off guard, yet very few know how brokers influence or manage their clients’ order fills. Whether you’re looking for a new broker or reviewing existing venues, knowing how they handle orders tells you about their quality.
In this article, we’ll go through:
- What slippage is and the main reasons it happens
- How execution models shape slippage
- How brokers react during volatile markets
- Practical steps to take to reduce slippage in your trading
What slippage is and why it happens
Slippage occurs when a trade is filled at a different price from the one you requested. It’s not always a sign that something has gone wrong, but usually because of how fast markets move.
The most common causes include:
- Latency: The time it takes for your order to travel from your platform to the broker’s server and on to the market.
- Low liquidity: When there aren’t enough buyers or sellers at a given price, orders slip to the next available level.
- Market gaps: Prices can jump overnight or around major news events, leaving no fill available at the original quote.
- High volatility: During data releases or geopolitical shocks, prices can shift faster than orders can be matched.
Brokers build their entire execution infrastructure around minimising these gaps, though how well they do it is another story.
How brokers control slippage
The execution model a broker uses has a huge impact on how slippage is handled. There are two main camps: dealing desk (DD) and no dealing desk (NDD) which includes ECN and STP brokers.
DD brokers act as the counterparty to your trades. They internalise orders, which means they can offer price guarantees, but it also creates a conflict of interest, since your loss is their profit.
NDD brokers pass your orders through to liquidity providers. Slippage here reflects real market conditions, which is generally more transparent, though it also means you may be exposed to erratic price movement.
Your broker’s platform settings matter too. If you trade on MetaTrader 4 or MetaTrader 5, they can actually influence how slippage is handled at the order level:
- For a market order, both platforms allow a deviation value which sets the maximum price difference from the requested price.
- “Fill or Kill” or “Immediate or Cancel” execution policies enables granular control over partial fills and rejections.
- Deviation parameters can also be defined on the back end. The tighter they are, the more requotes or rejections traders receive, a trade-off between execution certainty and fill rate.
What role liquidity providers play in slippage
Behind most retail FX brokers sits a network of liquidity providers (LPs) like banks, but mostly market makers or prime brokers. They fill orders at a wholesale level, and the quality of a broker’s LP relationships goes a long way to influence how much slippage you experience.
Brokers with access to a deep and diversified pool of LPs can aggregate prices and route orders to whoever is offering the best fill at that moment. This is known as smart order routing (SOR) and is one of the more effective tools brokers have for keeping slippage in check.
The fewer LPs a broker works with, the thinner their liquidity pool, and the more likely you are to see orders slipping during busy periods. It’s worth asking any prospective broker how many LPs they work with and whether they use SOR or a fixed routing model.
How brokers manage slippage during volatility
This is where things get really interesting, and where you’ll quickly find out what your broker is made of. During high-impact events like US Non-Farm Payrolls or central bank decisions, slippage can be monumental.
Brokers often use a few approaches to manage this:
- Widening spreads pre-event: Rather than letting slippage hit on execution, brokers widen their spreads 5 minutes beforehand. You pay the cost upfront, but the fill is cleaner.
- Holding orders: Some dealing desks will pause order execution for a fraction of a second to allow prices to stabilise, a controversial practice that isn’t always disclosed.
- Rejecting orders: Other brokers may reject market orders and issue a requote, asking whether you want to proceed at the new price.
- Negative slippage protection: A growing number of brokers now offer this as a feature, slippage only works in your favour, never against you. If the market moves adversely between your request and fill, the broker absorbs the difference.
If you’re trading around news, make sure you understand your broker’s stated policy for these situations.
What slippage policies reveal about integrity
A broker’s approach to slippage is one of the clearest windows into how they actually treat clients. Highly-regulated brokers are required to provide best execution, meaning they must take reasonable steps to get you the best available result on each trade.
Look out for the following when evaluating a broker:
- Slippage statistics: Reputable brokers publish execution quality data including the percentage of orders filled at the requested price and the average deviation.
- Symmetrical slippage: Slippage should work both ways. If you’re only ever slipped against your position, that’s a red flag.
- Clear documentation: The broker’s terms and conditions should spell out their execution policy.
- Third-party audits: Some brokers submit their execution data to independent auditors as a strong sign of transparency.
Traders should pay attention to slippage data because it tells a lot about how a broker prioritises client outcomes over their own margins.
How you can minimise slippage
While you can’t eliminate slippage entirely, you can still reduce how often and how badly it affects your trading.
- Use limit orders instead of market orders. Limit orders only fill at your specified price or better. You might miss some trades, but you won’t be caught out by adverse fills.
- Avoid trading around major news events unless your strategy specifically calls for it and you’ve sized your risk accordingly.
- Choose a broker with deep liquidity and transparent execution statistics, especially if you trade in larger sizes.
Conclusion
Slippage is a feature of fast-moving FX markets, but how brokers manage it is anything but random. From the execution model and the LPs to the settings baked into servers, a broker’s infrastructure and policies dictate your execution quality. As a result, traders should measure slippage transparency as part of their selection process.
FAQ
What is slippage in FX trading?
Slippage is the difference between the price at which you placed an order and the price at which it was actually filled. It can be in your favour as positive slippage or against you as negative slippage.
Is slippage always the broker’s fault?
Not necessarily. Slippage often reflects genuine market conditions such as low liquidity or latency. However, brokers with poor infrastructure or dodgy practices can make it much worse.
What’s the difference between slippage and a requote?
A requote happens when the broker rejects your order at the original price and offers you a new one. Slippage is when the order goes through, but at a different price.
Do ECN brokers have less slippage than market makers?
ECN brokers pass orders to real liquidity, so slippage reflects market conditions. Market makers internalise orders and may offer price guarantees.
Can I avoid slippage?
No, but you can significantly reduce it by using limit orders, avoiding major news or choosing a broker with strong liquidity.
What should I look for in a broker’s slippage policy?
Look for symmetrical slippage (both positive and negative), published execution statistics, clear terms around high-volatility periods, and ideally third-party execution audits.
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