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Trading to a Drawdown Budgetthe maximum loss is the only number that matters

Evidence: ModerateBeginnerProp firm · Risk framing

A challenge gives you a profit target and a maximum loss. Almost everybody optimises for the target. The arithmetic says to optimise for the loss, because the target can be reached late and the loss can only be breached once.

The method is to convert the maximum loss into a number of consecutive losing trades you can survive, and then set the per-trade risk from that — not from a habit, and not from what makes the target look reachable.

Nothing here states any firm's rules. Firms differ and they change their terms — read your own rulebook and write the numbers into the bot. Every page assumes you have done that.

Applies to
Any evaluation or funded account with a maximum loss rule
Timeframe
Any — the arithmetic is the same on every horizon
The calculation
per-trade risk = maximum loss ÷ (the losing streak you must survive × a safety factor)
Reality check
A strategy with a 50% hit rate produces a run of seven losses far more often than traders expect
Tools
Your firm's maximum-loss rule, in writing · your strategy's own worst historical losing streak

Valid setup

PF-01 · TRADING TO A DRAWDOWN BUDGET — ACCOUNT EQUITY the per-trade risk is set by the distance to the floor, not by the distance to the target EVALUATION 92.3 95.2 98.2 101.1 104.0 106.9 109.9 THE LOSING RUN THE SIZE WAS CHOSEN FOR THE ENTIRE BUDGET — divided by the streak you must survive PROFIT TARGET — a consequence, not an aim start worst point of a six-loss run at the computed size MAXIMUM LOSS — breached once and the account is gone 1 2 3 4 108.0 100.0 97.0 94.0 ① Size computed from the floor before any trade is taken ② Six losses in a row — survivable by construction ③ Not survivable at the size most people choose ④ The target arrives late, and that is fine ⑤ Watch the distance to the floor daily ⑥ Check whether your firm's drawdown trails

Exact rules

Entry

  • Find your strategy's worst losing streak in its own record. Not the average — the worst.
  • Assume the live streak will be longer than that, because one sample understates the tail. Adding half again is a reasonable working assumption and it should be stated as an assumption.
  • Divide the maximum loss by that number. That is the per-trade risk, and it is usually far smaller than the trader expected.
  • Check whether the profit target is reachable at that size within the time allowed. If it is not, the honest conclusion is that this account size does not suit this strategy — not that the risk should go up.

Stop loss

  • Two limits run at once: the firm's maximum loss, and the firm's maximum daily loss. The daily one is usually the one that ends accounts, because it can be hit on a single bad morning.
  • Set your own daily limit below the firm's, with room for slippage and for a position that gaps. Hitting the firm's limit exactly is a breach, not a near miss.
  • Know whether your firm's drawdown is measured on balance or on equity, and whether it trails. Those are different rules that produce completely different sizing, and the answer is in your rulebook rather than in this page.

Take profit / exit

  • The profit target is a consequence of surviving, not a thing to aim at directly. Traders who aim at it size up, and sizing up is what breaches the loss rule.
  • Track the distance to the maximum loss daily, in the same place you track profit. Most dashboards show one and not the other.
  • If the target requires a risk per trade you would not run on your own account, the challenge is not a version of your strategy — it is a different, worse one.

Build Trading to a Drawdown Budget

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More from Prop firm

The Low-Variance Profilemany small trades rather than a few large onesRule-Compliant Executionthe breaches that have nothing to do with lossesAfter Fundingthe account you keep is not the one you passed

Trading carries risk and most retail accounts lose money. Nothing on this page is financial advice or a recommendation to trade. The chart is an illustration of the rules on constructed candles — it is not a record of a trade and not a backtest.