The maximum drawdown gets the attention because it is the number that ends the account outright. The daily loss limit is smaller, it resets, and it is the one people actually breach — because a rule you meet every single day has many more chances to catch you than a rule you meet once.
What it is measuring
A daily loss limit caps how far your account can fall within one trading day. The critical question is what it measures that fall against, and there are two answers.
- Against closed balance: only booked trades count. An open position 3% underwater is invisible to the rule until you close it.
- Against floating equity: open positions count continuously. That same 3% counts the moment it exists, and a position that dips and recovers can breach on the dip.
The second is far stricter and is the more common of the two. Under it, a trade that would have been a winner can still end your evaluation, because the rule measured the worst point rather than the outcome. Check which one your plan uses before you size a position; it is in the trading rules.
Under an equity-based limit, a trade that would have been a winner can still end the account. The rule measures the worst moment, not the outcome.
When the day rolls
The reset happens at a fixed time in the firm's stated timezone, not in yours and not at your local midnight. This sounds like trivia and is not.
Two consequences. A position held across the rollover has its loss counted against the old day up to the boundary and against the new one after it — so the same open trade can consume part of two allowances. And if you trade a session that straddles the rollover, half your session is running on an allowance that is already partly spent.
How to use it deliberately
Treat the daily limit as a budget rather than a boundary. A boundary is something you approach; a budget is something you allocate before the day starts.
A workable rule is to spend no more than half of the daily allowance on any single day's trading, which means the limit itself is only reachable after a sequence of things going wrong rather than one. Setting a personal stop at half the published number costs nothing on good days and is the difference between a bad day and a finished account on the worst ones.
The pattern to watch for
Almost every daily breach has the same shape. An early loss, then a larger position taken to recover it inside the same session, then the limit. The first loss is normal and survivable. The response to it is what breaches.
The countermeasure is decided in advance or not at all: a fixed number of losing trades after which the day is over regardless of what the chart is doing. Two is a common choice. The specific number matters much less than having chosen one before the day started.