A common misconception is that drawdown is measured from the account’s starting balance, or that a deposit or withdrawal “resets” it. Neither is true: drawdown is derived from the account return, which deliberately excludes all cash movements. This article explains what that means in practice — especially for master accounts protected by a Maximum Drawdown risk limit (see Risk limits for master traders).
The peak is a return, not a dollar figure
Return is calculated per period between balance operations (each deposit, withdrawal, or transfer ends one period and starts the next), and the cumulative return is the product of the period returns — so the cash movement itself never enters the math (see Return calculation). Drawdown compares the current cumulative return against the highest cumulative return the account has ever recorded:
Return (per period) = Equity_end / Equity_start
Cumulative Return = Return P1 × Return P2 × … × Return Pn
DD = (1 − (1 + Current Return) / (1 + Maximum Return)) × 100Three properties follow directly
1. Deposits and withdrawals do not affect return, so they do not affect drawdown — in either direction. 2. The Maximum Return “peak” is remembered for the lifetime of the account and never decreases. 3. Drawdown reads 0% only while the current return equals the Maximum Return — i.e. while the account sits at a fresh high in return terms.
Because return is computed on equity, floating P/L of open positions counts too: a Max DD risk limit can fire on unrealized losses before anything is closed.
Worked example — withdrawal timing changes the headroom
A master account starts at $1,000 and has a 20% Maximum Drawdown risk limit. The trader plans to bank profits by withdrawing them and continuing to trade the remaining $1,000.
Step 1 — the run-up
Equity rises to $1,071. Cumulative return factor = 1,071 / 1,000 = 1.071 (+7.1%). This becomes the Maximum Return.
Step 2 — the pullback
Equity falls back to $1,020 and all positions are closed. Current return factor = 1.02 (+2.0%). The account is already carrying a drawdown — even though it is still $20 above its starting balance:
DD = (1 − 1.02 / 1.071) × 100 = 4.76%Step 3 — the withdrawal
The trader withdraws $20; the balance shows a clean $1,000 again. A new return period begins with Equity_start = $1,000 — but nothing about the drawdown state changes: cumulative return is still +2.0%, Maximum Return is still +7.1%, and the current DD is still 4.76%. The withdrawal neither resets the peak nor restores headroom.
Step 4 — where the 20% stop now fires
The risk limit triggers when DD reaches 20%, i.e. when the cumulative return factor falls to 1.071 × (1 − 0.20) = 0.8568. In the new period the cumulative return is 1.02 × (Equity / 1,000), so:
Equity at trigger = 1,000 × 0.8568 / 1.02 = $840On the fresh-looking $1,000 balance the stop fires at $840 — only $160 (16%) of room, not $200 (20%). The missing 4 percentage points are exactly the unrecovered drawdown carried in from the pullback.
Equity over time — the drawdown gap travels with the account
Three scenarios compared
The same account and the same 20% limit, differing only in when (and whether) the trader withdraws:
| Scenario | Maximum Return peak | DD carried into new period | Stop fires at equity | Room left |
|---|---|---|---|---|
| Withdraws exactly at the peak ($1,020, before any higher peak) | +2.0% | 0% | $800 | $200 = full 20% |
| Peaks at $1,071, pulls back, withdraws at $1,020 | +7.1% | 4.76% | $840 | $160 = 16% |
| No withdrawal — holds after the $1,071 peak | +7.1% | 4.76% | ≈ $857 | — |
The first row is the clean case: withdrawing while current return equals the Maximum Return starts the next period with zero drawdown, so the full 20% buffer applies to the remaining balance. Any withdrawal made *below* the return peak carries the gap forward and shrinks the effective buffer by exactly that gap.
Topping up does not re-arm a breached limit
Max DD is a lifetime value that never decreases, and deposits do not affect it. Once an account has recorded a Max DD at or above its limit, the same limit cannot be set again — a new limit must be strictly above the current Max DD. For a fresh limit at the old level, use a new master account (its return and drawdown history starts from scratch).
Not the same as the High Water Mark
The High Water Mark (HWM) is a performance-fee concept: it records the equity peak on which a fee has already been charged so investors never pay twice for recovering the same drawdown. The drawdown “peak” is the Maximum Return point, tracked independently — the two can sit at different levels on the same account.
Takeaways
- Drawdown is measured against the account’s return peak, not the starting balance and not a dollar equity figure.
- Deposits and withdrawals are neutral: they neither reset the peak nor restore headroom — the gap to the peak travels with the account.
- Floating P/L counts: equity-based drawdown can trigger a risk limit on open positions.
- To keep a full drawdown buffer after banking profits, close and withdraw at equity highs, not after a pullback.
- The gap only closes by trading back above the old return peak, which sets a new Maximum Return and re-zeroes the drawdown.
