What Is Invalidation in Trading?

Invalidation is the price or condition showing that the original trade idea is wrong. It matters because it defines where the plan stops being valid rather than where the trade merely feels uncomfortable.

Invalidation is the point at which the original reason for a trade no longer holds. The article stresses that this should be tied directly to the thesis, not to emotion or a trader's pain threshold. For example, if a trade depends on support holding, then a break through that support or a close below a chosen level may invalidate the idea, depending on the rule used. This matters because invalidation is what anchors the stop, position size and maximum risk before entry. If invalidation is vague, the rest of the plan becomes vague as well.

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