A daily loss limit is a circuit breaker. Prop firms set it as a percentage of the starting or daily balance, often 4–5%, measured on balance or on equity, and breaching it ends the account. Independent traders set their own, often in R: for example, stop after −3R in a day. The time the day resets matters too, usually midnight in a given time zone.
Example
A trader risks 0.5% per trade and sets a personal daily limit of −2%, which is four full losses. On a bad morning they lose three trades (−1.5%) and are close to the limit, so the next trade is cut to 0.25% risk or skipped. A prop firm with a 5% limit on a $100,000 account would end the challenge if equity fell $5,000 below the day's starting balance, open losses included.
Why it matters
Most blown accounts come from a few very bad days rather than a slow decline. A hard daily limit caps the damage from tilt and revenge trading and keeps a single session from undoing weeks of work.
Common mistake
Setting the limit but treating it as a suggestion. A limit you override just this once teaches you to override it. It works best when it is enforced automatically, by the exchange, by a platform or by a rule you cannot change mid-session.
Put it into practice
FAQ
- How do prop firms calculate the daily loss limit?
- It varies. Common versions are a percentage of the initial balance or of the balance at the start of the day, measured on equity including open trades. Read your firm's exact definition.
- What daily loss limit should I set?
- Many traders use two to three times their risk per trade, so that a few losses in a row end the day before emotions take over.
- Do open trades count toward the daily loss?
- At most prop firms, yes: unrealised losses count. A trade that briefly dips past the limit can end the account even if it later recovers.