Almost every prop firm evaluation is governed by two separate loss limits that operate differently and fail independently of each other: the daily loss limit and the maximum drawdown. Confusing the two, or assuming they work the same way, is one of the most common causes of an avoidable account breach.
Daily loss limit: a rule that resets
The daily loss limit caps how much your account can lose within a single trading day, usually measured from either the previous day's closing balance or the start-of-day equity, depending on the firm. Once the trading day rolls over (at a fixed time set by the firm), the limit resets and you have a fresh daily allowance again. This rule exists to stop a single bad session from ending an otherwise solid evaluation.
Maximum drawdown: a rule that accumulates
Maximum drawdown caps the total loss allowed across the entire evaluation, and it does not reset daily. Depending on the firm, it is calculated in one of two ways:
- Static drawdown — measured from your starting balance and fixed for the whole evaluation.
- Trailing drawdown — the loss limit "trails" your highest equity point, meaning the allowed floor rises as your account grows and can feel tighter after a strong run of profit.
Side-by-side comparison
| Feature | Daily loss limit | Maximum drawdown |
|---|---|---|
| Resets? | Yes, every trading day | No, applies to the whole evaluation |
| Typical range | 3% – 5% of account size | 6% – 12% of account size |
| Main risk it protects against | One catastrophic session | Slow, cumulative erosion over weeks |
| Most common trader mistake | Ignoring open floating losses when calculating remaining room | Not realizing a trailing floor has moved up after a good week |
Why trailing drawdown catches experienced traders off guard
Traders used to a static drawdown sometimes assume that banking early profit gives them a permanent cushion. Under a trailing model, that cushion can shrink as the floor rises with the account's new equity peak, meaning a string of profitable days can paradoxically leave less room for a single bad one than it did at the very start of the evaluation.
A practical way to track both rules at once
Keep a simple running note of three numbers before every trade: today's remaining daily allowance, distance to the maximum drawdown floor, and the smaller of the two. Sizing every position against whichever number is smaller avoids the common trap of respecting one rule while accidentally breaching the other.
- Which rule causes more failed evaluations?
- Anecdotally, the daily loss limit causes more single-session breaches, while trailing maximum drawdown causes more late-stage failures after an otherwise strong run.
- Do drawdown rules apply the same way on funded (live) accounts?
- Usually yes, and sometimes more strictly, since a breach on a funded account also affects real payouts, not just the evaluation outcome.
