How Maximum Drawdown Is Actually Calculated (Trailing vs Static, Balance vs Equity)

Published 2026-08-25

The max drawdown rule ends more prop challenges than bad trading does. Yet most traders can't say exactly how their own limit is measured — which means they don't know how close they are until it's too late. There are only four moving parts. Once you understand them, the rule stops being a mystery and becomes a number you can watch.

Part 1: What the drawdown is measured against — balance or equity

Your account has two numbers at any moment:

Balance — the result of your closed trades only.
Equity — balance plus the floating profit or loss of every trade currently open.

This distinction is the single biggest source of surprise breaches. Most prop firms measure drawdown against equity, not balance. That means an open trade sitting at a large unrealized loss can breach your limit before you ever click close — even if you fully intend to hold it and it later recovers. The firm doesn't wait to see if you're right.

Part 2: Where the line starts from — static vs trailing

The drawdown limit is a floor sitting some distance below a reference point. The question is whether that reference point moves.

Type	How the floor behaves
Static (absolute)	The floor is fixed at a set amount below your starting balance and never moves. Simple to track.
Trailing	The floor rises as your account makes new highs — it "trails" your peak. It stops rising once locked (often at your starting balance) in some programs, and never in others.

Trailing drawdown is the one that catches people. Because the floor follows your highs, a winning session raises the bar you can later fall through.

Worked example: a static vs trailing 10% limit

Say you start a $100,000 account with a 10% maximum drawdown ($10,000). You trade well and equity peaks at $106,000, then give some back.

	Static rule	Trailing rule (trails equity peak)
Breach floor	$90,000 (fixed)	$96,000 ($106,000 peak − $10,000)
Room from the $106k peak	$16,000	$10,000
Effect of your winning session	None — floor stayed at $90k	Floor climbed $6,000 with you

Same 10% number on paper, very different reality. Under the trailing rule, the profit you just made tightened the leash. Traders who don't recompute the floor after a good run are the ones who breach on a routine pullback.

Part 3: Daily vs overall — two separate clocks

Most challenges run two drawdown rules at once, and either one ends the account:

The maximum (overall) drawdown — the total floor described above, for the life of the account.
The daily loss limit — a smaller floor that resets each day from that day's starting balance or equity. Miss it and you're out, even if your overall drawdown is healthy.

The daily limit has its own trap: when it resets. If it resets at the firm's server midnight (often a different time zone than yours), a position held across that rollover is measured against a brand-new starting point. Know your reset time in your own clock.

Why this is a monitoring problem, not a skill problem

Notice that none of the above is about picking better trades. It's about knowing, in real time, four things: whether you're measured on equity, where the floor currently sits, how much it trailed after your last high, and how far today's separate daily line is. As the pass-rate data shows, the large majority of failures are exactly these rule breaches — not losing strategies.

The fix is boring and reliable: compute your distance to both floors, including floating P/L, and check it before sizing a trade rather than after. That's a measurement you can automate and never have to hold in your head mid-session.

PropGuard tracks your live distance to max drawdown and the daily loss limit — floating P/L included, on MT5. Free to start →

This article is educational content, not financial advice. Exact drawdown rules — static vs trailing, balance vs equity, reset times, and locking behavior — vary by firm and by program. Always confirm the specific terms of your own challenge with your provider before trading.