Implementation guide · Prop Evaluation Rules
Consistency Rules: Largest-Day Share of Profit
Calculate a largest-day profit ratio under a declared rule, showing how losing days, denominator choice and reporting windows change the result.
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Published by FxTrusts, a supplier of brokerage and prop firm technology. Prepared with AI-assisted research and drafting; reviewed against the cited public sources. Examples are illustrative. Product links describe our services.
Quick answer
A consistency rule can compare the largest qualifying day with a defined total profit measure. The denominator, day boundary, window and treatment of losses must be stated. Two programs can use the same label and reach different results from the same trading history.
Read numerator and denominator separately
The numerator might be the largest daily net profit, while the denominator might be total net profit or only the sum of profitable days. Those formulas are not equivalent. Topstep and FTMO publish program-specific objectives that illustrate why the exact terms matter. This page does not reproduce current thresholds or recommend how to pass a program. It shows how to specify and test a selected calculation.
Include losing days according to the declared model
If the denominator is net profit, a losing day reduces it while leaving an earlier best day unchanged. The resulting ratio can rise even though no larger winning day occurred. If the denominator instead sums positive days only, that same loss does not reduce the denominator. A dashboard should name the measure rather than displaying an unexplained consistency percentage that hides this distinction.
Define windows, rounding and incomplete days
A lifetime window, an evaluation phase and a period since the last payout can all produce different totals. An intraday best day may also change before the business day is finalized. Specify whether the comparison uses full precision and how equality is treated. When the denominator is zero or negative, do not divide blindly or manufacture a favorable percentage. The policy must define how that state is displayed and reviewed.
Reconcile the metric without encouraging rule circumvention
A useful operator worksheet lists each day’s qualifying result, the selected largest day, the denominator and the current policy outcome. It should explain adjustments and disputed transactions. It is not a trading plan or a suggestion to place unnecessary trades to change a ratio. Qualification can involve other objectives and a separate review, so satisfying this one calculation does not establish promotion or payout entitlement.
One history, two different denominators
Assume daily results of +400, +300, −200 and +100 units. The largest positive day is 400. Total net profit is 600, producing 66.666…%. The sum of positive days is 800, producing 50%. Both arithmetic results are correct for their declared formulas. They must not be compared with the same threshold unless the actual policy defines that threshold for that denominator.
| Input or model | Calculation | Result |
|---|---|---|
| Daily net results | 400 + 300 − 200 + 100 | 600 net units |
| Positive-day sum | 400 + 300 + 100 | 800 units |
| Largest day ÷ net profit | 400 ÷ 600 × 100 | 66.666…% |
| Largest day ÷ positive-day sum | 400 ÷ 800 × 100 | 50% |
Implementation checklist
- Write the exact numerator, denominator and reporting window.
- Test losing days and zero or negative denominator states.
- Specify business-day finalization, rounding and equality behavior.
- Keep other eligibility rules and human review separate from the ratio.
Sources
These documents support the reference. Check the original publication for current requirements and the limits of its scope.
- Topstep program-specific consistency ruleshelp.topstep.com
- FTMO program-specific trading objectivesftmo.com
- Python decimal arithmetic and roundingdocs.python.org
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