Trailing vs end-of-day drawdown, explained

Every prop-firm account has a line below which it is closed. The line is called the drawdown, and the number next to it — $2,000, $3,000 — is the part everyone reads. The part that decides whether you keep the account is how the line moves.

Three ways the line can move

Firms publish drawdown rules in their own words, but every rule reduces to one of three update behaviors:

Update timing and enforcement timing are different questions

This is the distinction most explanations skip. A rule can recalculate the line at end of day and still enforce it live: the threshold moves once a day, but if your unrealized loss touches it at 2 pm, the account is closed at 2 pm. Firms describe exactly this combination in their own documentation. So for any account you hold, you need two answers, not one:

1. When does the line move? Intraday with the peak, at end of day, or never.
2. When is it enforced? Against unrealized P&L during the session, or against the closing balance only.

If a firm's page does not state the second answer, treat it as unknown. Sizing a position off a guessed enforcement rule is how accounts end on a day the trader thought was safe.

Where the trail stops

Many trailing rules stop rising once the line reaches the starting balance, or the starting balance plus a small buffer. Once locked, the account behaves like a static-drawdown account from that point on. The lock level, and whether it exists at all, is a published rule for the funded stage that is often different from the evaluation stage of the same product. Read both.

The number to know before every trade: your room

Room is the distance between where the account is now and the line, in dollars, as of this moment. It is not the headline drawdown figure. A worked example with made-up numbers:

• Starting balance $50,000, trailing drawdown $2,000, line starts at $48,000.
• Peak balance reaches $51,200 on an open position. The line is now $49,200.
• The position is closed at $50,400. Balance is up $400 from the start. Room is $1,200, not $2,000, and not $2,400.

Under an end-of-day rule the same sequence leaves the line at $48,000 until the close, so room during the session is $2,400. Same trades, same balance, half the room under one rule and double under the other. That is why the type matters more than the amount.

The trader-favorable side

Drawdown rules are not only restrictions. An end-of-day rule lets you hold through an intraday pullback that a trailing rule would have turned into a closed account. A static floor never punishes an open winner. A published lock level tells you exactly when the account stops trailing. Knowing which rule you bought lets you pick the product that fits how you actually trade, instead of trading against a rule you did not know you had.

What to write down for each account

1. Drawdown amount.
2. Update type: intraday, end of day, or static.
3. Enforcement: live against unrealized P&L, or at close. Unknown if the page does not say.
4. Lock level for the funded stage, if any.
5. The date you read the page. Rules change mid-year and older accounts sometimes keep older rules.

Firmtrack's rule book records exactly these fields for supported firms, sourced from the firm's own page and dated, with "not verified" shown where a page is silent instead of a guess. The reward:risk calculator is the companion for the sizing side of the same decision.