Full round-trip cost analysis for stocks, futures, and forex.
On a $15,000 position with $0 commissions and a 1-pip spread, the round-trip forex cost is still $10. For a trader making 20 trades/day, that is $200/day or $50,000/year in spread costs alone.
Always calculate your fees as a percentage of expected profit per trade. If fees represent more than 10–15% of your average win, your strategy may not be viable at scale.