Education
The Consistency Rule, Decoded
The most misunderstood rule in prop trading — and the simple math that keeps you compliant.
Almost every modern prop firm uses some version of a consistency rule. The phrasing varies but the intent is the same: prevent a single lucky day from carrying an evaluation or a payout cycle.
A typical formulation: no single trading day may account for more than thirty percent of total net profit at the time of payout request. Some firms use twenty percent, some use fifty. Some apply the rule only at payout. Others apply it inside the evaluation as well. Read the exact percentage and exact trigger in your firm's documentation.
The math. If you have ten thousand dollars of net profit at payout request and the cap is thirty percent, no single day in the account history can exceed three thousand dollars net. If your best day was four thousand dollars, you have two options. Trade more days to dilute the percentage (you would need total profit above approximately thirteen thousand three hundred dollars for the four thousand dollar day to fall within the cap). Or wait and let new trading days lift the total profit before requesting.
What violates it. The trader takes a high-conviction trade that runs for an outsized gain — say, a single day of four thousand dollars in a five thousand dollar target evaluation. The trader hits the profit target and requests payout. The single day exceeds eighty percent of total profit. The firm denies payout pending additional trading days to dilute.
How to stay compliant in practice. Decide before each session what your "rule-compliant cap" is for the day. If your existing profit total is five thousand dollars and the cap is thirty percent, your day cap is two thousand one hundred forty-three dollars (the breakeven where today's number equals thirty percent of the new total). When you approach the cap, take partials and reduce size. This is unsexy and it is exactly what the consistency rule rewards.
The firms that publish their consistency math openly are the ones to prefer. Vague consistency language combined with discretionary enforcement is one of the cleanest predictors of payout disputes.