How to track a position you scale into, one entry at a time

Last checked: 8 October 2026. Education only, not personal investment advice.

Scaling in means building a position in pieces rather than all at once. Investors do it because they rarely know the exact low, and because buying in thirds makes it easier to act at all. The risk is that each add feels like a fresh decision with fresh money, so the total size creeps far beyond what you would have taken in one go. The fix is to treat the entries as parts of one plan with one budget.

Step one: one budget, split evenly

Notice what equal risk does. The entry closest to the stop gets the most shares, because each share there can only lose $3. Your average entry lands near the lower prices, which is where you wanted to be buying. And no matter how many entries fill, the most you can lose is the budget.

Step two: measure the whole position, not each leg

If the stock reaches your target of $120 and you sell all 149 shares, the proceeds are $17,880 and the profit is $17,880 − $14,155 = $3,725. On $745 of risk that is 5.0R.

If the stock instead closes below $90 after all three filled, you lose $745, which is −1.0R. That is the same loss you accepted before the first share was bought.

And if only the first entry filled before the stock ran to $120? Profit is 25 × $20 = $500 on $250 of risk taken: 2.0R. Measure R on the risk you actually took, not the risk you planned. Otherwise a position that never got built looks like a failure when it was a perfectly good small win.

Scaling into a winner instead

The other way to scale in is to add as the trade proves itself: buy a starter, then add after a higher low forms, raising the stop each time. It costs a worse average price but you only add size to positions that are already working. The journal treatment is the same. Each add has its own entry and stop, the group shares one budget, and the finished position is judged in R on the total risk taken.

The one rule that keeps this honest

An add that was not in the plan is a new decision, and it needs a new line in the journal saying why. "It is cheaper now" is not a reason. It is a description. If the stop moves lower to make room for another add, write that down, because that is the single most expensive habit in investing.

How the RB Trading journal handles scaled entries

This is what the DCA / Split Entries tab on Add Trade was built for.

1. Choose two or three entries and set the total risk percentage. The journal splits it evenly and shows each entry’s share of the risk.
2. Type each entry’s price and stop. The journal sizes each entry from your account balance and shows the stop, size and risk under it.
3. Add a shared take profit, or a separate one per entry. The reward to risk updates per entry as you type.
4. Save. The entries are stored as one DCA group, so your stats count one position, and its R is the size-weighted R across every entry and exit.

Already holding a position and want to add? Open the trade, switch to the split-entry tab, and the journal offers to carry your open position in as Entry 1. It keeps the size you already hold, and the risk percentage sizes only the new entries. A closed trade cannot be added to, because that would invent history that never happened.