An educational guide from Traderseg. General education, not investment advice. Every firm writes its own rules, so always check yours.
The short version: a prop firm challenge has two kinds of loss limit. A daily loss limit caps what you can lose in one session. A maximum drawdown caps how far the account can fall overall, and it is either static (fixed) or trailing (it rises as your account rises). The trailing kind ends more accounts than any other rule, because profits move your floor up.
Daily loss limit
A cap on losses within a single trading day, usually reset at the start of each session. On a $100,000 account with a 3% daily limit, losing $3,000 in one day breaks the rule, even if the account is still up overall.
Static drawdown
The floor is set from your starting balance and never moves. With a 10% static drawdown on $100,000, the floor is $90,000. If you grow the account to $115,000, the floor is still $90,000, so you now have $25,000 of room.
Trailing drawdown
The floor follows your highest balance. With a 5% trailing drawdown on $100,000, the floor starts at $95,000. If the account reaches $108,000, the floor rises to $102,600. A $5,400 pullback from that peak now ends the challenge, even though the account is still above where it started.
There are two versions, and the difference matters:
- Intraday trailing: the floor follows your highest open balance, tick by tick. A winning trade that runs up and then gives back its gain can still drag your floor higher.
- End-of-day trailing: the floor moves only with your closing balance each day. If the account touches $107,000 during the day but closes at $103,000, the floor is calculated from $103,000.
Some firms stop trailing once the floor reaches a set level, often near the starting balance. Rules vary and change, so read your firm's current terms.
How to size trades around these rules
- Size from the room left, not the account size. If you are $2,000 above a trailing floor, your real account is $2,000, whatever the balance says.
- Keep each trade's risk well inside the daily limit. Several losses in a row are normal; a size that makes three losses break the daily limit is too big.
- Be careful with open profits on intraday trailing accounts. Taking partial profits or tightening stops stops a spike-and-reverse from raising your floor for nothing.
- Know your numbers before the session. Write down today's floor and today's maximum loss before the first trade.
Practise it before it costs a fee
Try the free prop challenge sample: trade real replayed prices under prop-firm drawdown rules, no sign-up and no card. The risk tools work out position size, drawdown and prop-firm rule limits, and the free Kelly Quick Check shows how much an edge can justify risking. See also The Kelly Criterion Explained.
Educational content only. Not financial advice. Trading involves substantial risk of loss, and prop firm challenge fees are usually non-refundable.