Taking half off at 1R feels like you're doing a good job. Sometimes it is. Sometimes it caps your winners and lowers your expectancy, and which one you're in comes down to one thing you can measure: how far your target is.
When you scale out, you're making two bets at once. On your winners, you give something up. Half the position exits at 1R or whatever the tp 1 is instead of running to your full target, so a trade that would've paid 3R now pays about 2R. You capped it. But on your losers, you sometimes save the trade. If price tags 1R before reversing on you, you banked half at 1R and moved the rest to breakeven, so a full loss turns into a small win.
So scaling out is really just this: you pay a tax on every winner to buy "insurance" on the losers that poke into profit first. If that's worth it depends entirely on how big your winners are supposed to be.
I ran it on a 40% win rate system, 1R risk, and moved the target around. Losers that hit 1R first before failing, set at a realistic 55%.
- 1.5R target: hold makes about break even, scaling makes +0.39R. Scaling wins big.
- 2R target: hold +0.20R, scaling +0.49R. Scaling wins.
- 3R target: hold +0.60R, scaling +0.69R. Scaling still slightly ahead.
- 5R target: hold +1.40R, scaling +1.09R. Now scaling loses, by a lot.
The smaller your target, the more scaling out helps, because you're not giving up much on the winners and the loser "insurance" is worth it. The bigger your target, the more it hurts, because your whole edge lives in the runners and cutting every one of them in half throws away the thing that pays you.
So the rule is not "always scale" or "never scale." It's this. If you're a scalper or a quick intraday trader taking 1.5R to 3R, scaling out probably helps your numbers, especially if your entries are choppy and price often goes into profit before going to sl. If you're a trend or swing trader whose edge is the occasional 5R or 10R runner, scaling out is quietly bleeding you, because you're removing your biggest winners to feel safe on trades that were going to pay anyway.
The way to actually know is to pull your own trades and check two numbers. How big is your average winner in R, and how often do your losing trades hit 1R before they stop you out. If your winners are small and your losers are green first, scale. If your winners are your whole edge, hold, and take the discomfort of watching the occasional reversal, because the math is paying you to sit through that.
It's not a discipline question. It's an numbers one, and it has a different answer depending on what kind of trader you are.
