THE LEXICON · TRAILING DRAWDOWN
Trailing Drawdown
Trailing drawdown is the prop-firm rule that moves your account's floor up as equity makes new highs and never moves it back down. An account can sit above its starting balance and still be one ordinary loss from termination.
How the floor moves
A trailing drawdown is a floor that ratchets. The firm sets a fixed distance, called the drawdown amount, and holds the account's permitted loss threshold that far behind the highest equity the account has reached. A new peak lifts the floor by the same amount. A losing stretch leaves it where the last peak put it. While the floor is still trailing, the offset behind the peak holds at the drawdown amount and does not widen.
The details are the firm's, and they differ enough to matter. Some measure the peak on end-of-day balance, so the floor moves only once the session is settled. Others measure it on intraday equity with open positions marked in, so a trade running in the account's favor lifts the floor before anything has been booked. Some stop the floor once it reaches the starting balance, or the starting balance plus a set buffer, and hold it there for the life of the account. Others trail to the end. No version is standard. The binding one is written into the rulebook attached to the specific account.
Why the rule exists
The firm is underwriting the account. A static floor leaves an exposure in one direction: an account can run its balance far above the starting figure, then give all of it back to a threshold that never moved. A trailing floor closes that gap. For as long as it trails, the firm's exposure stays a fixed distance behind the account's peak, however high that peak climbs. It also removes the pattern of building an early cushion and then trading loosely against it. The rule sits on the firm's side of the ledger as an exposure control, and carries no judgment about the account holder.
What it does not tell you
The trailing floor is an accounting rule. It says nothing about volatility, nothing about the instrument, nothing about whether a position is well constructed. It does not settle what an account can afford to risk on a given trade either. That is arithmetic — headroom against stop distance and contract size — and the answer changes every time the floor moves. A balance above the starting figure carries no information about headroom on its own. It records that the account once printed a peak, and the distance from that peak is what the rule enforces.
It is the single most misunderstood number in funded trading. The account's balance is displayed constantly while the floor beneath it is not, so an account can be well above where it started and still sit one ordinary loss from termination, the same loss it took last week without consequence.
How a desk reads it
A desk works from headroom: the distance between current equity and the current floor, restated every time either one moves. Two accounts carrying the same balance at the same firm can hold very different headroom, because they reached different peaks getting there. Headroom moves during a session. The drawdown amount printed in the rulebook does not. On YOUR DESK the headroom line sits on every prop account that logs its trailing figure, held in front of the trader while the position is open.
How it gets misread
The common error is checking the trailing figure against the starting balance. The rule does not measure from there. While the floor is still trailing, it measures from the account's peak, and the peak only moves one way, so an account above its starting balance can carry less headroom than it did on day one. At firms that trail on intraday equity, an open trade that runs and then gives it back lifts the floor without a dollar being booked, and the account can breach on a trade that closed flat.
Where it lives
The rule sits beside the other rails a funded account answers to, and these terms cover the rest of that rulebook.
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