Decide when to stop before you start

The worst moment to decide whether to keep trading is right after a loss. Your attention is narrow, the last trade is loud, and almost any next step can be made to sound reasonable. A stopping rule written before the session takes that decision away from the version of you who is least equipped to make it.

This is not about choosing the right limit. Your numbers depend on your account, your firm’s rules, and your plan. It is about writing the limit down early enough that you are only following it later, not still arguing about it.

Write the rule while you are calm

A stopping rule has to be specific enough that you cannot reinterpret it in the moment. “Stop if things go badly” is a mood. “End the session after two losing trades” is a rule you can check.

For each rule, record:

• Trigger: the observable event that activates it, such as a number of losses, a dollar amount, or a time of day.
• Action: exactly what happens next, such as closing the platform, switching to review only, or waiting for a set break.
• Scope: whether it ends the session, the day, or only a particular setup.
• Source: whether it is your firm’s limit or your own, stricter rule.

Keep firm limits and personal rules separate. A firm’s daily loss limit tells you where the account is at risk. Your own rule can sit well inside that line, and it should describe the point where you stop trusting your decisions, not only the point where the account is in danger.

Name the trade after the trade

Many sessions do not go wrong on the first loss. They go wrong on the entry that follows it: taken sooner than planned, sized larger than usual, or justified as “getting it back.”

Give that moment its own rule. You might require a short pause before any re-entry, or a sentence in your journal confirming the setup before you act. You might hold re-entry size at your normal amount. The specific choice matters less than deciding it in advance and recording whether you followed it.

A rule you wrote before the session is a promise. A rule you invent after a loss is a negotiation.

Make the limit visible

A rule you have to recalculate in your head is easy to drift past. If your daily limit is a dollar amount, keep a running view of how much of it you have used. If it is a count of losses, mark each one as it happens.

Visibility turns a vague sense of “I should probably stop” into a plain fact: the condition you wrote down this morning has been met. That leaves less room for a new story about why today is different.

Review the rule, not just the result

When you break a stopping rule, log it as an execution note rather than burying it in the outcome. A session that recovered after you ignored your limit still contains a departure from the plan, and a profitable exception can teach the wrong lesson.

During your weekly review, ask whether each rule was clear, whether you followed it, and what happened in the moments you did not. If a rule keeps getting broken, decide whether the trigger is unrealistic, the action is too vague, or the rule is doing exactly its job and the difficulty is in honouring it.

Change a rule between sessions, never during one. Keep the old version and the date the new one took effect, the same way you would version a setup definition. Then you can see which version of the rule you were actually working under.