- Spread at entry: 0.2 pips ($2).
- Commission round turn: $7.
- Average slippage on entry and exit together: 0.1 pips ($1).
- Total: $10, or 1.0 pip.
- VPS and data subscriptions spread across all trades in the month.
- Spreads during your own trading hours, which can be above the advertised average.
- Orders bounced or requoted, then filled at a worse level.
To do it with your own numbers, take one month of real fills and compute the average total cost per trade in pips. Then compare it with your average winner.
What surprised you most when you added up your costs?