Partial take-profits: smoother equity, or just a smaller edge?

[Amanhasnoname]

Closing half the position at the first target and letting the rest run is popular. It locks in profit and keeps exposure to bigger moves.

Mathematically, partials don't create edge. They reshape the distribution of outcomes. The expected value of the combined trade is the weighted average of the two exits. If both exits have positive expectancy, the total is positive, but it's not better than the best exit alone.

What changes is the variance. Smaller swings in equity are easier to live with, and may help a trader stick to the plan.

For scalpers there's an extra cost. Two exits mean two spreads on the closing side if done on the same position size, or an additional commission. Where costs are a large share of the target, the extra friction hurts.

A fair test compares three versions: full exit at the first target, full exit at the second, and the partial approach. Differences are often smaller than expected.

Partial exits also interact with minimum lot sizes. On a small account, closing half of 0.02 lots leaves 0.01, which limits how flexible the scale-out can be, so the idea may need adapting rather than copying from someone trading a much larger size.

Which exit method works best for your style, and what does the data say?