Quick answer: increase size only when three conditions hold at once: at least 50 trades on the current system, positive expectancy measured in R, and 90% or better discipline in following your plan. And when you do increase, add 25% at most. The number-one cause of blown accounts is not a bad system — it is a good system suddenly traded at double the size.
Key takeaways
- Scaling is a data decision, not a mood.
- Small frequent increments beat big jumps.
- Every size increase amplifies both profit and drawdown.
- You need a written rule for going back to the previous size.
- If the size changes your behaviour, it is too much size.
How do I know I'm ready to size up?
| Condition | Minimum | How you measure it |
|---|---|---|
| Trade sample | 50 | Same system, same rules |
| Expectancy | Positive in R | Average R per trade |
| Discipline | 90% | In-plan trades / total trades |
| Max drawdown | Known and acceptable | Largest fall from a peak |
| Emotional stability | No behaviour change | Notes in your journal |
If even one is missing, don't size up. Three good weeks is not a sample.
How much to add each step
A 25% increment works because it barely changes how the trade feels and changes the compounded result a great deal. Starting from 0.50 lots:
| Level | Size | Requirement to move up |
|---|---|---|
| 1 | 0.50 | 50 trades with positive expectancy |
| 2 | 0.62 | 30 more trades with no deterioration |
| 3 | 0.78 | 30 more trades with no deterioration |
| 4 | 0.97 | 30 more trades with no deterioration |
| 5 | 1.21 | Full plan review |
From level 1 to level 5 the size multiplies by 2.4, yet each individual step is almost invisible to your nervous system. That is the whole idea.
The step-down rule
Scaling up without a rule for coming down is gambling. Write it before you need it:
- Lose 5% from your equity peak: back to the previous level.
- Lose 8%: down two levels.
- Break the plan twice in one week: down one level regardless of P&L.
- To move back up, meet the same requirements as the first time.
Stepping down is not a punishment: it is what keeps the account alive for the next cycle.
Mistakes that undo all of the above
- Doubling the lot after three wins in a row.
- Sizing up to “make back” what a drawdown took.
- Scaling and changing the strategy in the same week.
- Holding the higher level when the dollar drawdown is costing you sleep.
- Scaling a system whose expectancy was never measured.
What makes scaling easier
Two things: clean data and consistent execution. The journal is the data half — the ebook The Trading Journal Blueprint has the structure for calculating expectancy and discipline. Execution is the other half: in Cortex Automation risk per trade is a parameter, so changing level is a number instead of a decision made in the heat of the moment; the Cortex Signal Kit keeps your entry criteria identical as size grows. If you would rather test first, the Automation Test runs five days.
Frequently asked questions
How often should I increase size?
By trades, not by calendar. Every 30 new trades with no deterioration is a reasonable pace.
Is 50 trades a big enough sample?
It is the practical minimum to see anything. At 100 trades the conclusion is far more reliable.
Can I move risk from 1% to 2%?
You can, but you also double the expected drawdown. Most consistent traders stay between 0.5% and 1%.
What if the new size makes me nervous?
Go back to the previous level immediately. Nerves change execution, and execution is what produced the results.
Does this apply to funded accounts?
Yes, with one extra layer: there the program's loss limit overrides any scaling plan of your own.
Make size a parameter, not an impulse. See Cortex Automation or try it with the Automation Test.
Disclaimer: educational content. The thresholds are references and should be adapted to your own system. Cortex Next is not a financial service and guarantees no results. Trading involves risk of loss.
