Prop Drawdown Rules: Daily, Max, and Trailing Explained

Why drawdown is the gate

Most challenge failures happen not because someone “couldn’t make money” but because they exceeded a loss limit. A profit target is reachable with time, but drawdown can disqualify you instantly on one big loss or a day of overtrading. So prop is a game of always knowing “where does it end if I lose” more than “how much can I make.”

Let’s work through each limit. (Assume a $100,000 account.)

① Daily drawdown

The most you can lose in one day relative to the day’s starting point. If the daily limit is 5%:

Daily limit  = 100,000 × 5% = $5,000
Today's floor = today's start balance − 5,000
→ if intraday equity drops below this line, you breach

Two things to confirm:

• Is the basis balance or equity? — most firms use equity, which includes unrealised P&L. So while you hold a position, a growing floating loss can breach you without closing the trade.
• Reset time — the daily limit resets at a set time each day (often server midnight). Be careful right before/after the reset, when the floor changes.

② Max drawdown

The most loss allowed across the whole account. This is where the method splits — static vs trailing is the single biggest driver of a challenge’s difficulty.

Static — the line is fixed

Max limit   = 100,000 × 10% = $10,000
Fail line   = 100,000 − 10,000 = 90,000 (fixed)
→ breach if equity drops below 90,000. Profit doesn't move this line

The most intuitive. The fail line stays at 90,000 start to finish, so your real cushion grows as profit accumulates.

Trailing — the line follows your highs

Trailing means the fail line rises every time the account makes a new high. Two sub-methods:

Method	When the line updates	Character
Intraday	Every moment equity makes a new high	Tightest. Counts even floating intraday profit as a high
EOD (end of day)	Only on the day’s closing balance	Forgiving of intraday swings; based on the closing balance

An example makes the difference obvious. Say the account rises 100k → 105k, then falls back (max limit 10%):

[Static]           Fail line = 90,000 (unchanged)
[Trailing EOD]     If closing balance is 105,000 → fail line = 105,000 − 10,000 = 95,000
[Trailing intraday] The moment of the 105,000 high → fail line = 95,000 immediately

So under trailing, if you make $5,000 and give it back, your principal is unchanged but the fail line has risen to 95,000 — and you can be disqualified. That’s why “keeping what you made” matters so much.

Both limits apply at once

In practice the daily and max limits work simultaneously. So before each order, what you really need to see is: “if this position hits its stop, does it cross the nearer of the two limits?”

Today's cushion = daily limit − amount already lost today
Total cushion   = current equity − max fail line
Safe cushion    = the smaller of the two
→ if (expected loss if this order's stop hits) > safe cushion, it's risky

Doing this before placing the order is the core of prop survival. Realising it afterward — “oh, I crossed it” — is already a fail.

Automating the math

Doing this drawdown math by hand on every order is tedious. Merini offers it in two forms — a free prop drawdown calculator (enter your account and rules to scenario-check the limits, fail lines and headroom before you attempt) and a prop cockpit that attaches to the live terminal and warns you before you place an order (“this lot size would breach the daily limit”). For now, you can build the instinct in the demo by setting an account size and loss limits yourself → Open the free web demo

Frequently asked questions

Which is harder, trailing or static?

Generally intraday trailing is hardest. Floating intraday profit counts as a high and lifts the fail line, so giving profit back can breach you. Static keeps the fail line fixed and is more intuitive. Either way, the firm’s actual figures drive the real difficulty.

Can I avoid drawdown by not setting a stop?

No — the opposite. Because most rules are equity-based (including unrealised P&L), skipping the stop means you hit the limit the moment the floating loss grows. A stop is a tool to prevent a drawdown breach.

When does the daily limit reset?

Usually at server midnight, but the time varies by firm. Check the reset time and the calculation basis (balance/equity) in that firm’s docs.

If the account is in profit, does the max limit grow?

Under static, the fail line is fixed, so your real cushion grows. Under trailing, the fail line follows your highs, so profit may not translate straight into cushion.

Related → What is prop trading · Prop challenge types · Preparing for a challenge · Margin explained