What breaking your own rules costs — in dollars

MAC — FOUNDER, TRAPPER'S EDGE · FORMER FIDELITY TRADE SPECIALIST (SERIES 7 · 63 · SIE)

There's one number every trader avoids calculating: what did ignoring your own rules cost you — in dollars?

Not bad luck. Not bad analysis. Just the trades where you knew better and clicked anyway.

I avoided it for years, which is how $75,000 of my own money left quietly — a few hundred at a time, on trades I can barely remember. So when I built the accounting for it, I made one decision that matters more than the arithmetic:

Only realized losses on rule-breaking trades count. A rule-breaking trade that got lucky and won costs $0 in this math.

That makes the number deliberately conservative — which means it's never inflated, so it's never arguable. When it's ugly, it's ugly on the merits.

The rules it catches

• No stop or target recorded.
• Oversized against your own risk budget.
• Widened the stop mid-trade.
• Bailed early on a gut call.
• Traded through your own cooldown.
• Longs while your own regime read said defensive.

Notice whose rules those are. Not mine — yours. The app doesn't decide what a good trade is. It just counts what happened to the trades that broke the plan you wrote when you were calm.

The reframe that matters

That dollar figure is the only loss in trading that's 100% yours to control. The market decides your winners. You decide your leaks.

Most traders spend their study hours on entries — new setups, new indicators, new scanners. But if rule breaks are costing you four figures a quarter, the highest-paying work in your trading isn't a better entry. It's a smaller leak. Most traders work on their entries; the money is in the leaks.