Consistency rule
A consistency rule is a prop firm limit on how much of your total profit may come from a single day. It stops one lucky day from passing an evaluation.
In depth
A typical version caps the best day at 30 or 40 percent of total profit. Say the target is 3,000 dollars and the cap is 30 percent. No single day may contribute more than 900 dollars, so you need four or five decent days rather than one huge one.
The arithmetic bites when the big day comes early. Make 2,000 on day one against a 3,000 target and the cap is measured against your final total, so you have to keep trading until 2,000 is only 30 percent of it. That total is 6,667 dollars. Read your firm's exact wording, since the number and the base differ.
Why it matters
Traders hit the profit target and fail anyway, which is a painful way to learn. It also changes how you trade. After a big day, sizing up makes the problem worse and trading smaller for a few sessions is the way out. A rule you did not read is still a rule you broke.
TraderLog does not track prop firm rules, but the calendar shows each day's profit and loss, so your best day against the total is easy to check. The stats page reports your best and worst day, and the free calculators cover position size and expectancy.
Frequently asked questions
A cap of 30 to 40 percent of total profit from any single day. The exact number varies by firm.
Usually the evaluation is not passed until the totals even out. Rules differ, so read your firm's wording.
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