The spread on the screen isn't the cost that hurts
Posted: Fri Oct 30, 2026 6:14 am
Quoted spread is a brochure number. It gets measured on calm afternoons with nothing going on. The cost that actually leaves the account is the realised one: spread at the exact moment of entry, slippage on the way in, spread again on the way out, plus commission if the account charges it.
Say a scalper targets 4 pips and the real round-trip friction is 0.9. That's more than a fifth of every winner gone before the trade does anything. Spread that over a few hundred trades a month and it dwarfs most strategy tweaks.
And friction isn't flat. It balloons around data, around rollover, and in the thin Asian hours on crosses. A backtest with a fixed 0.5 pip spread can look beautiful and then lose money live for exactly this reason.
Quick audit: export the last 100 trades, compare intended entry with filled price, add up the gap. The total tends to be a rude surprise.
Some traders keep a tiny note next to the chart with the average realised cost per round trip for each pair. Looking at it before every session keeps expectations grounded, and a 3 pip target on a pair that costs 1.2 pips to trade gets quietly dropped from the watchlist.
The pairs with the lowest realised cost are rarely the ones with the lowest advertised spread. Worth ranking them by real numbers, not by marketing.
What's the true round-trip cost on the pair that gets traded most? Has it ever actually been measured?
Say a scalper targets 4 pips and the real round-trip friction is 0.9. That's more than a fifth of every winner gone before the trade does anything. Spread that over a few hundred trades a month and it dwarfs most strategy tweaks.
And friction isn't flat. It balloons around data, around rollover, and in the thin Asian hours on crosses. A backtest with a fixed 0.5 pip spread can look beautiful and then lose money live for exactly this reason.
Quick audit: export the last 100 trades, compare intended entry with filled price, add up the gap. The total tends to be a rude surprise.
Some traders keep a tiny note next to the chart with the average realised cost per round trip for each pair. Looking at it before every session keeps expectations grounded, and a 3 pip target on a pair that costs 1.2 pips to trade gets quietly dropped from the watchlist.
The pairs with the lowest realised cost are rarely the ones with the lowest advertised spread. Worth ranking them by real numbers, not by marketing.
What's the true round-trip cost on the pair that gets traded most? Has it ever actually been measured?