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Trailing drawdown, explained
A trailing drawdown floor rises with your account's best-ever point — its high-water mark — rather than staying fixed at your starting balance. That single difference is why an account can be breached while it is still sitting above where it started, and the arithmetic below shows exactly how.
Static vs trailing, in one table
Same account, same trades, two different rule types, two different verdicts. A $50,000 account with a $2,000 allowance, walked through an identical sequence of days:
| Floor type | How the floor is set | Verdict on this account's actual path |
|---|---|---|
| Static | Fixed once, from the starting balance: $50,000 − $2,000 = $48,000, forever | No breach — equity never fell below $48,000 on this account's path |
| Trailing | Reset upward every time equity sets a new high: peak − $2,000 | Breach — the floor climbed to $50,400 after a $52,400 peak, and equity later fell to $50,100 |
Identical trading. Identical account. One rule type ends the account; the other does not. The difference is entirely in how the floor itself is defined, not in anything the trader did differently.
The formula
floor = high-water mark − allowance. The allowance is usually a fixed percentage of the starting capital, set once. The variable that actually moves is the high-water mark, and it comes in two versions worth telling apart: a closed-balance high-water mark only updates when a profit is realised and a position closes, while a peak-equity high-water mark updates the instant unrealised profit on an open position reaches a new high, whether or not that position has closed yet.
The three ways firms trail it
Intraday, equity-based. The floor follows unrealised profit tick by tick. A price spike you never banked still raises the floor permanently, even if the position gives it all back a minute later.
End-of-day. The floor only updates from the balance recorded at each day's close. An intraday spike that fades before the close never touches it — only a gain that survives to the end of a trading day raises the floor.
Trail-then-lock. The floor trails upward exactly like one of the two variants above, but only until it reaches the starting balance plus the profit target, after which it stops rising and behaves like a static floor from that point on.
Which of these three a specific rule set actually uses is entirely firm-specific, and it is exactly the kind of detail worth reading directly on that firm's own current rules page, stamped with the date you checked it, before assuming any of the three.
Worked example
A clearly hypothetical account, invented to show the arithmetic: $50,000 starting capital, a 4% ($2,000) intraday equity-based trailing allowance.
| Day | Peak equity so far | Floor | Current equity | Headroom | Verdict |
|---|---|---|---|---|---|
| 0 | $50,000 | $48,000 | $50,000 | $2,000 | OK |
| 1 | $51,000 | $49,000 | $51,000 | $2,000 | OK |
| 2 | $52,400 | $50,400 | $52,400 | $2,000 | OK |
| 3 | $52,400 | $50,400 | $51,800 | $1,400 | OK |
| 4 | $52,400 | $50,400 | $50,600 | $200 | OK |
| 5 | $52,400 | $50,400 | $50,100 | −$300 | BREACH |
Read Day 5 twice. Equity is $50,100 — still $100 above the $50,000 the account started with. By any everyday reading of "am I up or down," this account is up. It still breaches, because the floor was set from the $52,400 peak reached back on Day 2, not from the $50,000 starting point, and $50,100 sits $300 below that $50,400 floor. Headroom, the gap between current equity and the floor, is the only number that actually matters under a trailing rule — not the gap to your starting balance, which this example shows can be positive and irrelevant at the same time.
Why the intraday version is the harshest
An intraday, equity-based trail locks in a floor from a high you never actually banked. Day 2's $52,400 peak in the worked example above might have existed for a single tick before pulling back, never once showing up as a closed, realised gain — and the floor still moved up $2,400 anyway. An end-of-day variant would not have raised the floor at all unless that $52,400 was still the balance when the trading day actually closed, which is exactly why the same account, same trades, can pass under one trailing variant and breach under another.
How to trade under a trailing floor
Watch headroom, not account balance — the distance from current equity to the floor is the number that ends the account, and it can shrink even while the balance itself is rising, the moment a new high-water mark resets the floor upward. Reducing position size immediately after setting a new high, rather than after a loss, protects headroom precisely when the floor has just moved closer. Banking partial profit converts an intraday high into a closed gain, which matters specifically under an end-of-day trailing variant, since only closed, end-of-day balance moves that kind of floor.
A practical habit that costs nothing to adopt: check headroom immediately after any new equity high, not just after a loss. A losing trade is an obvious moment to reassess risk; a winning trade that just reset the floor is the less obvious one, and it is exactly the moment the account's tolerance for the next mistake just got smaller.
Why this shows up most in prop-firm evaluations
Trailing drawdown is common on funded-account rule sets specifically because a firm paying real profit splits from a funded or simulated account has a direct interest in a floor that rises alongside the account, rather than one that stays fixed once the account is well ahead of its starting point. A static floor left far below a well-performing account effectively stops constraining risk at all once the account has built up enough of a cushion; a trailing floor keeps the constraint live no matter how far ahead the account gets. Neither design is inherently unfair — they measure risk differently, and which one a specific evaluation uses changes what "safe" actually means for that account at any given point.
How to find out which type you have
Three sentences to look for on any rule set's own page: whether the maximum-loss limit is described as static or as increasing/trailing; whether it references equity (unrealised profit included) or balance (closed trades only); and whether there is any mention of the floor stopping once a specific level is reached. If none of the three is clear from the wording, the specific question to put to support in writing is: "does my maximum-loss floor trail intraday equity, only my end-of-day balance, or does it lock at some point — and if so, where?" Keep the written reply.
Price the floor before you commit
Toggle static against trailing on the same hypothetical numbers before deciding which kind of rule set you're comfortable trading under — the prop firm challenge calculator models both, and a drawdown recovery calculator shows how much ground a given pullback actually costs you to make back, which is worth knowing before a trailing floor turns a manageable pullback into an account-ending one. If you already have closed trading history, replaying it shows how close your own actual equity curve would have come to a trailing floor, not just a static one.
See what the floor actually costs you
Toggle static vs trailing on your own numbers, free.
Prop firm challenge calculatorOr replay your own history against a rule set: the (in-progress) prop firm challenge tracker.
Questions
What is trailing drawdown in simple terms?
A loss floor that rises along with the best point your account has ever reached, rather than staying fixed at your starting balance. The amount you are allowed to lose is measured from your high-water mark, so the floor keeps climbing every time you set a new high, and it never moves back down.
Does trailing drawdown follow unrealised profit?
Depends on the variant, and this is the detail worth confirming on any specific rule set before you rely on it. An intraday or equity-based trail follows unrealised profit tick by tick, so a peak you never banked still raises the floor. An end-of-day trail only follows the balance at each day's close, ignoring anything that happened only intraday and was given back before the day ended.
Does the trail ever stop?
On some rule sets, yes — a trail-then-lock design stops the floor rising once it reaches the starting balance plus the profit target, after which it behaves like a static floor from that point on. Whether a given rule set locks, and at what level, is set by whoever wrote it; read the current rules rather than assuming.
Why did my account breach while I was up?
Because the floor was measured from your account's own best-ever point, not from where it started. Being up relative to your starting balance says nothing about your distance from a trailing floor, which only cares about the gap to your own high-water mark — the worked example on this page shows an account $100 above its starting balance still breaching, because it had fallen $300 short of the floor set by an earlier, higher peak.
Which is harder, intraday or end-of-day trailing?
Intraday, generally, because it can lock in a floor from a price spike that never survived to a close and that you never actually realised as profit. An end-of-day trail only ratchets up when a gain has actually been banked at the close of a trading day, which gives a trader at least one full session to react to a new high before the floor catches up to it.
Prop firm challenge calculator ·Drawdown recovery calculator ·Maximum drawdown ·Absolute drawdown ·Balance vs equity ·MT5 report analyzer
No specific firm's rule type is asserted anywhere on this page without a linked, dated source — this page describes the mechanics generically. No tool on this site prevents a breach; the calculators and analyzer above only show you the numbers you're already trading under. This is educational information about measuring your own trading, not financial advice. Trading carries risk of loss. Full risk disclaimer.