A prop firm challenge is rarely lost on the profit target. It is lost on two loss rules: the maximum daily loss and the maximum drawdown, often trailing. With a 6% trailing drawdown on $100,000, a trader can be failed at $97,900, just −2.1% from the start, without ever losing 5% in a single day.
You read "maximum drawdown: 6%" and think: I can lose $6,000. You start well, +$4,000 on day one. On day three, after an average session, your account is closed. You reread the rules: it was all there, in one line. The calculation was not.
This article names no prop firm and recommends none. It explains how the most common rules are calculated, so you can read yours before paying.
What is the maximum daily loss?
It is the loss you cannot exceed in a single trading day, often set at 4 or 5% (common values, check your own rules). Three details change everything:
- The base. The percentage sometimes applies to the initial balance, sometimes to the start-of-day balance or equity.
- Floating P&L. Many rules count equity, meaning open positions. A trade open at −$4,800 against a $5,000 limit puts you at the edge, even if it ends up a winner.
- The day's cut-off. The day starts and ends at a precise time, in a precise time zone (often the server's).
Static or trailing drawdown: what is the difference?
The maximum drawdown sets a floor your account must never go below. Everything depends on how that floor moves.
| Type | The floor | Example on $100,000, 6% |
|---|---|---|
| Static | Never moves | $94,000, for the whole challenge |
| Trailing on close | Rises with the highest closing balance | High − $6,000 |
| Trailing on equity | Rises with the highest point reached, floating included | Intraday high − $6,000 |
| Capped trailing | Rises up to the starting balance, then becomes static | Locked at $100,000 once reached |
Static is the simplest: your margin only grows when you win. Trailing is the trap: every gain brings the floor closer, and it never comes back down.
How does a trader get failed at −2.1%?
Three days, 6% trailing drawdown on closing balance (example figures, no specific prop firm):
| Day | Closing balance | High | Floor | Margin left |
|---|---|---|---|---|
| Start | $100,000 | $100,000 | $94,000 | $6,000 |
| D1 | $104,000 | $104,000 | $98,000 | $6,000 |
| D2 | $101,000 | $104,000 | $98,000 | $3,000 |
| D3 | $97,900 | $104,000 | $98,000 | Failed |
On D3, the loss is $3,100, or −3.07% for the day: below the 5% daily limit. Since the start, the account is only down 2.1%. But the floor rose to $98,000 on the very first winning day. The challenge is over.
The variant that shrinks your margin further
If the high is measured on equity, floating profit counts. On D1, your trade runs to +$5,500 before you exit at +$4,000. The recorded high is $105,500, the floor moves to $99,500. On D2, at $101,000, your real margin is $1,500 on a $100,000 account.
How do you size your risk with a trailing drawdown?
From your real margin, not the advertised percentage. Recalculate every morning:
Today's margin = current balance − current floor
Then ask how many consecutive losses that margin must absorb. Losing streaks give an order of magnitude: at a 40% win rate, a streak of 11 losses or more happens about one time in ten over 100 trades.
Example at the start of the challenge: $6,000 margin, aiming to survive 11 losses in a row.
- Maximum risk per trade: 6,000 ÷ 11 ≈ $545, about 0.5% of the account.
- At $1,000 per trade (1% of the start), 6 losses in a row take you to the floor. At a 40% win rate, a streak of 7 or more happens about two times in three over 100 trades: a streak of 6 is even more common.
On D2 of the example, with $3,000 of margin, consistent risk drops to about $270 per trade. As long as the floor trails you, each gain shrinks your margin relative to your balance: that is usually the time to reduce size, not increase it.
Write your challenge rules before you start →
The 6 questions to ask before paying
- Daily loss: on balance or equity? Based on start-of-day balance or initial balance?
- Does floating P&L count? Can an open losing position trigger a fail?
- Is the max drawdown static or trailing? The word "trailing" should get your attention.
- If trailing: on closes or on equity? Your real margin depends on it.
- Does the floor stop? Many trailing rules lock once the starting balance is reached.
- When does the day end? Exact time and server time zone.
If an answer is unclear, that is already information. The article on the prop firm challenge covers what comes after passing.
The limits of this article
- Rules change. Only the rulebook in force when you buy counts.
- Figures are examples. 5%, 6% and $100,000 are common values, not references.
- Other rules exist. Minimum trading days, news restrictions, consistency rules: they can also fail an account.
This content is educational and is not investment advice. No prop firm is recommended. Trading involves a risk of capital loss.
Tracking your challenge rules on Trade Stack
On Trade Stack, you write your own Rules (for example "never more than −2% a day" or "max risk recalculated every morning"). In each Deep Review (Funded plan), you mark whether they were respected, and the respect rate is calculated rule by rule. You see which rule costs you most before it costs you the challenge.
Key takeaways
- Challenges are mostly lost on daily loss and max drawdown, not on the target.
- A trailing drawdown rises with your high and never comes down: you can fail at −2.1% from the start.
- Measured on equity, unrealised profit you never banked is enough to lift the floor.
- Size your risk from today's margin (balance − floor), divided by the losing streak you must survive.
- Six questions before paying: daily loss base, floating P&L, static or trailing, close or equity, cap, end of day.
Method: example built for illustration with generic rules (5% daily loss, 6% trailing drawdown on $100,000), no specific prop firm. Calculations: 104,000 − 6,000 = 98,000; 3,100 ÷ 101,000 = 3.07%; 105,500 − 6,000 = 99,500; 6,000 ÷ 11 ≈ 545. Streak of 11 losses: simulation from the losing streaks article (40% win rate, 100 trades).
