Price improvement on retail FX orders: does it actually happen?

[Fairman]

Price improvement on retail FX orders: does it actually happen?

Price improvement means getting filled at a better price than you asked for. A buy order at 1.1000 filled at 1.0999, for example. In some markets it's common. In retail FX it depends a lot on the broker.

With market orders, if the price moves in your favour between the moment you click and the moment the order is filled, a broker with symmetric execution should give you the better price. A broker with asymmetric execution keeps the improvement and only passes on slippage against you.

With limit orders, a limit should fill at your price or better. If price gaps through your limit, you should get the better price. In practice, many retail platforms simply fill limits at the limit price.

How to check: look at your fill prices compared with the requested price over a reasonable number of trades. If you only ever see slippage against you and never any in your favour, that suggests asymmetric handling. A broker with fair execution should show some trades with positive slippage, especially in fast markets.

Most execution policies mention this somewhere. If it isn't clear, ask support directly whether positive slippage is passed on.

It's a small amount per trade, but for scalpers trading often, it adds up over a month.

[Fairman]

Some brokers publish execution statistics, showing the percentage of orders filled at the requested price, with positive slippage and with negative slippage. These are useful when available, though they're averaged across all clients and might not reflect your specific pairs or times. Still, a broker that publishes them is being more open than one that doesn't. If the statistics show a meaningful share of positive slippage, that's a reasonable sign that improvements are being passed on to clients at least some of the time. No statistics at all is a reason to ask more questions, though not proof of anything on its own.

[Fairman]

In MT4 and MT5, the deviation or slippage setting on market orders affects this. A deviation of zero on an instant execution account can lead to more requotes, because any price change rejects the order, including changes in your favour on some setups. A small allowed deviation lets the order fill if price moves a little, ideally in both directions. On market execution accounts the setting usually doesn't apply. Checking which execution mode you're on helps explain what you see in your fills. It's one of those settings people never look at until the fills start looking odd.

[FXS Prop Desk]

In retail FX, symmetric slippage is the honest version: positive slippage passed on as well as negative. Some brokers state this in their execution policy, and checking the trade history for fills better than the requested price shows whether it actually happens.

Limit orders are the clearest case. A limit that fills at a better price than requested is price improvement, and on some brokers it happens regularly during fast moves. If it never happens over hundreds of trades, that tells you something too.

[Fairman]

Limit orders are where price improvement shows up most clearly, if it happens at all. A buy limit placed below the current price fills at your limit or better, and some brokers do pass on a better fill when price gaps through. With market orders, any improvement is usually small and less consistent. If you're curious whether your broker passes on improvement, comparing your limit order fills with the order price over a few months gives a clear answer. Most of the time they'll match exactly, but the occasional better fill shows the broker isn't keeping all of it.

[Fairman]

I'd also compare positive and negative slippage over a decent number of trades. A fair broker should show both, in roughly similar amounts during normal conditions. If you only ever see negative slippage, look into it. The broker might be applying asymmetric slippage, where it passes on bad fills but keeps good ones. Many regulators have rules against this, and if your data shows a clear pattern, it's reasonable to raise it with the broker or regulator. A simple spreadsheet of requested versus filled prices is enough evidence to start.