Trader guide · figures drawn from the 90 firms we track

The consistency rule at prop firms, with a best-day calculator

By Prop Firms Top Research DeskEditorial teamUpdated October 5, 2026List prices, no promo codes

Short answer: the consistency rule limits how much of your overall profit your single strongest day may supply, and 20% is the cap we see at the most firms (31). At most firms going over it is not a fail: you keep trading until total profit grows enough. Some firms instead hold back the payout or remove the excess profit, so check your account's terms.

Accounts with the rule

77%

of 1,500 that state it

Cap used by most firms

20%

31 firms

Tightest cap

15%

strongest day ÷ total

Firms with an exempt account

Why firms use a consistency rule

A firm would rather fund someone who earns steadily than someone who passed on one giant trade. The consistency rule enforces that by capping the share of profit one day can contribute. Firms typically check it when you finish a test or when you ask for a payout.

It is stated as a percent, for example "your best day must stay under 40% of total profit". Some firms compare the best day with the profit goal rather than total profit, and some check it only on funded accounts. When and how it is measured matters more than the number itself, so read the precise wording for your account.

Not every firm uses one. Hash Hedge, for instance, runs every one of its accounts without a consistency rule.

The formula

Best-day share = best day's profit ÷ total profit. When that share is over the cap, the cure is more profit, not less: total profit needed = best day ÷ cap.

Worked example: a $100,000 account has an 8% goal ($8,000) and a 40% rule. Your strongest day made $5,000. 5,000 ÷ 8,000 gives 62.5%, which is over the cap. Total profit has to reach 5,000 ÷ 0.40 = $12,500, so you need $4,500 beyond the goal, all without touching a loss cap.

Best-day calculator

Profit or loss for each trading day, one figure per day (put - before a loss)

Cap %

This calculator divides by total profit. If your firm compares the best day with the profit goal instead, put the goal in as the total when you check by hand.

Which caps are most common

We have 1,500 accounts where the firm states its position on this rule. Of those, 77% apply a consistency rule and 23% say plainly that they do not. For accounts that give a percentage, the caps break down as follows:

Accounts at each consistency cap

A lower cap is harder: at 15%, your strongest day has to stay below about one-seventh of total profit.

Trading comfortably under a consistency cap

Set a daily profit stop as well as a loss stop. Under a 40% rule, stop trading for the session when your gains reach 40% of the goal.
Hold position size steady. Most consistency trouble begins with a single day traded at double size.
Find out whether the rule covers the test, the funded account or both, because that decides how you approach phase one.
If your edge depends on occasional large days such as breakouts or news, pick from the firms that skip the consistency rule.

Where to read next

Questions traders ask

What does a consistency rule mean at a prop firm?

It limits the part of your overall profit that one trading day may supply. Under a 40% rule, your strongest day can make up no more than 40% of total profit at the moment you pass or ask for a payout.

How do you work out the consistency percentage?

Take your best day's profit and divide it by total profit. When the answer is over the firm's cap, you trade on until total profit catches up: total needed = best day ÷ cap.

Which firms drop the consistency rule?

In our data, 21 firms have one or more accounts without a consistency rule. Our no-consistency-rule page compares the firms that skip it.

Is the rule checked during the challenge or only when funded?

That varies by firm and program. A lot of firms check it only on funded-account payouts, while others check it during the test as well. Check the terms of the exact account you plan to buy.