How to track options P&L correctly: round-trips, fees, and win rate
Why most options P&L tracking is wrong, and how to do it right — grouping fills into round-trips, applying per-contract fees, and reading win rate alongside expectancy.
Tracking options P&L sounds trivial — subtract what you paid from what you sold. In practice, three things quietly corrupt the number for almost everyone who does it by hand: fills, fees, and the wrong headline metric. Fix those three and your P&L finally tells you the truth.
1. Group fills into round-trips
A position is rarely one fill. You leg in, add on a dip, roll the strike, scale out in two closes. If you track each fill as its own line, you will overcount trades, mangle your average hold time, and compute a win rate that means nothing. P&L has to be measured per round-trip — the full life of the position from open to flat — not per order.
2. Apply per-contract fees
Options carry per-contract commissions and regulatory fees that equity-style P&L math ignores. On small, frequent trades those fees are not a rounding error — they are the difference between a strategy that prints and one that bleeds. A correct tracker applies the actual per-contract cost to every leg so your net P&L is what hit your account, not a gross figure that flatters you.
3. Read win rate next to expectancy
Win rate is the metric everyone fixates on and the one that lies most often. A 70% win rate with tiny winners and rare-but-huge losers is a losing strategy. What you actually want to know is expectancy — the average P&L per trade, which folds together how often you win and how much you win versus lose.
- Win rate alone — how often you are right. Necessary, never sufficient.
- Average win vs. average loss — the payoff ratio that win rate hides.
- Expectancy — win rate and payoff combined into dollars per trade. This is the number to grow.
You can be right most of the time and still lose money. Expectancy is the only headline metric that cannot be gamed by cherry-picking the win rate.
Then slice it to find your edge
Once the headline number is honest, the useful work is slicing it. P&L by symbol shows which tickers you actually trade well. P&L by day of week and hour of day shows when your edge is real and when you are just filling time. P&L by setup shows which patterns deserve more size. None of this is visible in a broker’s fills list — it only appears once the data is grouped, fee-adjusted, and charted.
MyTradeLens does all three corrections automatically and ships the breakdowns out of the box, so "track my options P&L" stops meaning "rebuild a spreadsheet every Sunday" and starts meaning "open the dashboard and read."