Two traders see the same EURUSD setup at 1.0850. One buys at market and pays 1.0853. The other sets a limit at 1.0848 and waits. Twenty minutes later price dips to 1.0847, fills the limit trader at 1.0848, and both traders are in the same trade with a five pip difference in entry. Over a year of daily trades, five pips a trade on a full-size position is real money, and it came from nothing but the choice of order type.
What crossing the spread actually costs
A market order crosses the spread immediately: you buy at the ask, sell at the bid, and the difference between them is the toll for instant execution. On EURUSD that toll is often under a pip during London and New York hours. On a less liquid cross, or on gold during a thin overnight period, it can run several times wider. A limit order placed inside that spread, or below the market on a buy, avoids the toll entirely if it fills, because you are offering to trade at a price rather than accepting whatever is available right now.
The real price of waiting
The cost of a limit order is not measured in pips, it is measured in missed trades. Set a buy limit five pips below a breakout level and there is a real chance price never comes back down to fill it, especially in a strong trend where pullbacks are shallow. A trader who always waits for the perfect price on every setup will save a few pips on the fills that land and lose entire winning trades on the ones that run away without them. The spread saved on a filled limit order is worthless against a signal that never got taken.
When crossing the spread is worth it
Paying the market order toll makes sense when the setup is time-sensitive: a confirmed breakout already moving, a news reaction already underway, a level that just broke with follow-through. In these cases, the few pips lost to the spread are cheap insurance against missing the entire move while a limit order sits unfilled a few pips below. It also makes sense when position size is small enough that the spread cost is trivial relative to the stop distance, which is common on tighter intraday setups.
When the limit order is clearly better
A limit entry earns its place when the setup is a level, not a breakout: buying a pullback to support, selling a retest of resistance, entering at a specific price a strategy defines in advance. Here there is no urgency, the price is known before the trade, and there is no reason to pay the spread for a fill you can get for free by waiting a few minutes. This is also where limit orders protect a trader from their own impatience, since the order will not fill at a worse price no matter how tempting the chase looks in the moment.
A simple rule to decide
Ask whether the trade is reacting to a level or reacting to momentum already in motion. Levels favor limit orders, because the price is known and patience costs nothing. Momentum favors market orders, because the setup exists only while it is moving and hesitation is the actual risk. Traders who apply this one question before every entry stop treating order type as an afterthought and start treating it as part of the strategy itself.