Spread and Commission Eat Scalpers Alive
Posted: Thu Aug 20, 2026 9:00 pm
Here's a number every scalper needs to sit with for a moment: on a 5-10 pip profit target, a 1.5 pip spread already represents 15-30% of your entire target — gone before the trade has even had a chance to move in your favor.
This is the quiet math that separates scalping strategies that look good on paper from strategies that are actually profitable in live conditions. A backtest that ignores realistic spread and commission isn't testing your strategy. It's testing a fantasy version of your strategy that doesn't pay trading costs.
Before you commit real capital to any scalping approach, calculate your true breakeven win rate including costs — not the theoretical breakeven assuming a frictionless market. Include your actual broker's typical spread during your trading hours (spreads widen during low liquidity and news events, so use realistic, not best-case, numbers), plus any commission per lot.
Many traders discover, once they do this math honestly, that a strategy they assumed was solidly profitable is actually hovering right around breakeven once costs are properly subtracted. That's not a reason to give up on scalping — it's a reason to be selective about broker choice, trading sessions, and setup quality, because on tight timeframes, costs aren't a rounding error. They're a meaningful percentage of your edge.
This is the quiet math that separates scalping strategies that look good on paper from strategies that are actually profitable in live conditions. A backtest that ignores realistic spread and commission isn't testing your strategy. It's testing a fantasy version of your strategy that doesn't pay trading costs.
Before you commit real capital to any scalping approach, calculate your true breakeven win rate including costs — not the theoretical breakeven assuming a frictionless market. Include your actual broker's typical spread during your trading hours (spreads widen during low liquidity and news events, so use realistic, not best-case, numbers), plus any commission per lot.
Many traders discover, once they do this math honestly, that a strategy they assumed was solidly profitable is actually hovering right around breakeven once costs are properly subtracted. That's not a reason to give up on scalping — it's a reason to be selective about broker choice, trading sessions, and setup quality, because on tight timeframes, costs aren't a rounding error. They're a meaningful percentage of your edge.