A consistency rule limits how much of your profit can come from a single day. Many prop firms have one, and they word it in different ways, so it is worth knowing exactly how a firm measures it before you trade. This article explains the Drift Fund rule, shows the formula, and works through examples on a $50,000 account.
The rule in one sentence
Your best trading day may be at most 40% of the combined total of your winning days.
It is not a breach rule. If your best day is above 40%, nothing closes and nothing is taken from the account. It only delays the next step: passing a challenge phase, or requesting a payout on a funded account. You keep trading normally until the balance of your days brings the figure back under 40%.
Why a consistency rule exists
An evaluation is meant to show a repeatable process. One outsized day, often a single large position caught by a fast move, says little about how you trade on an ordinary day. A cap on the best day's share asks for the profit to be spread over several days, which is what a steady process looks like.
How we calculate it
Three details decide how a consistency rule treats you in practice.
- Days are UTC calendar days, and a trade belongs to the day it closes. On a challenge, profit on a position still open counts toward today, because passing closes it today.
- The comparison is with your winning days, not with your net profit. We add up only the days that ended positive (your gross winning days) and compare your best day with that total. Losing days do not shrink the total. Some consistency rules compare the best day with net profit instead, which is harder on a trader whose normal losing days reduce the net figure.
- The measurement follows your current profit run. If your account falls back below breakeven, the count restarts from the next day. An early big day whose profit you have since given back no longer counts against you.
The check itself:
best day ÷ total of winning days ≤ 40%
A quick way to read it: your winning days must add up to at least 2.5 times your best day.
Example 1: a challenge that passes
A $50,000 challenge with a 10% profit target ($5,000) and at least 5 trading days.
| Day | Result |
|---|---|
| 1 | +$1,100 |
| 2 | −$400 |
| 3 | +$1,600 |
| 4 | +$900 |
| 5 | −$300 |
| 6 | +$1,400 |
| 7 | +$700 |
- Net result: +$5,000, so the target is reached.
- Winning days total: 1,100 + 1,600 + 900 + 1,400 + 700 = $5,700.
- Best day: $1,600, which is 28% of $5,700. Under 40%, so consistency is met and the phase passes.
Example 2: a challenge that has to wait
The same $50,000 challenge, but most of the profit came from one day.
| Day | Result |
|---|---|
| 1 | +$3,200 |
| 2 | +$600 |
| 3 | −$200 |
| 4 | +$700 |
| 5 | +$700 |
- Net result: +$5,000, so the target is reached after 5 trading days.
- Winning days total: $5,200. Best day: $3,200, which is 62%.
- The account does not pass yet, and it does not fail either.
How far is it from passing? The winning days must reach 2.5 × $3,200 = $8,000, so about $2,800 more of winning days are needed, without a new day larger than $3,200 (that would become the new best day and raise the bar). The daily and maximum drawdown limits still apply while you trade, so the sensible plan is your normal size on normal days, not a rush to add profit.
Example 3: when the count restarts
- Day 1: +$2,000
- Day 2: −$1,500
- Day 3: −$1,000 (the account is now $500 below its starting balance)
Because the account went below breakeven on day 3, the measurement starts again on day 4. The +$2,000 from day 1 is no longer in the calculation: that profit is gone from the account, so it no longer counts toward your best day.
On a funded account
The same 40% rule applies before every payout request on a funded account, Instant Funded included. On a funded account it is measured from your last paid payout, or from the start of the account if you have not been paid yet, so each payout cycle is judged on its own days. If the figure is above 40% when you request, the request is refused with your current percentage, and you can request again once it is back under the limit.
Consistency is one of several payout conditions. The others include a minimum profit of 3% of the initial funded balance, a minimum account age of 14 days (counted again from each paid payout) and at least 5 trading days. The full list is in the rules.
How to plan around it
- Keep your risk per trade similar from day to day. A fixed fraction of the account on every trade (well inside the 2% per-trade limit, never exactly at it) produces days of similar size. The method is in Position sizing: the one formula that keeps your account alive.
- Do not double your size after a big day. A second outsized day raises the bar instead of lowering it.
- Do not force trades to fix the ratio. Extra trades taken only to add winning days raise your drawdown risk. There is no time limit on a Drift Fund challenge, so there is no reason to hurry. See No Time Limit Prop Firm Challenge.
- Watch the Consistency bar on your dashboard. It shows your best day as a share of your winning days, live, once the account is in profit.
Quick answers
Can the consistency rule fail my account? No. Only the breach rules close an account (the daily and maximum drawdown limits, for example). Consistency only delays a pass or a payout. How the drawdown limits work is explained in Trailing vs Static Drawdown.
Do losing days count? Not in the total of winning days. They reduce your net result, which matters for the profit target and the payout minimum.
Does it apply to every account type? Yes: 1-Step, 2-Step (each phase) and every funded account, Futures and Spot alike.
Which time zone defines a day? UTC, by the time each trade closes.
The bottom line
The Drift Fund consistency rule asks one thing: that no single day carries more than 40% of your winning days' total. It never closes an account, it compares your best day with your winning days rather than your net profit, and it forgets a big day whose profit you have already given back. Size your trades the same way every day and it rarely becomes a factor.
Drift Fund challenge and funded accounts trade in a simulated environment at live market prices. Payouts are performance rewards paid by Drift Fund. Trading involves risk, and past results do not guarantee future results. The full rules are published at driftfund.io/rules.