Most prop firm traders know trailing max drawdown exists. Very few understand exactly how it works — and that misunderstanding is one of the most common reasons traders fail evaluations they should have passed.
This guide explains exactly what trailing max drawdown is, how prop firms like Apex Trader Funding and TopstepX calculate it, and how to track it correctly so you never get caught off guard.
What Is Trailing Max Drawdown?
Trailing max drawdown is a dynamic loss limit used by most prop firms during evaluations. Unlike a static drawdown limit — which stays fixed from your starting balance — a trailing max drawdown moves up as your account balance grows.
Here's the key distinction:
- Static drawdown: Your loss limit is fixed. If you start with $50,000 and have a $2,500 drawdown limit, your floor is always $47,500 regardless of how much profit you make.
- Trailing max drawdown: Your loss limit follows your peak balance. If you grow your account to $53,000, your floor moves up to $50,500. The limit trails your highest point.
This sounds straightforward but the details of exactly how it trails — and when it stops trailing — vary by firm and create a lot of confusion.
How Apex Trader Funding Calculates Trailing Max Drawdown
Apex uses end-of-day trailing max drawdown on most of their evaluation accounts. Here's exactly how it works:
The drawdown floor is calculated based on your highest end-of-day balance, not your intraday high. This is a critical distinction — if your account peaks at $52,800 intraday but closes the day at $51,500, Apex trails from $51,500, not $52,800.
The floor moves up as your end-of-day balance hits new highs. Once your balance reaches a certain threshold — typically your starting balance plus the maximum trailing drawdown amount — the floor locks in permanently and stops trailing. At that point it effectively becomes a static drawdown for the rest of the evaluation.
For example on a $50,000 Apex evaluation with a $2,500 trailing drawdown:
- Starting floor: $47,500
- If end-of-day balance reaches $52,500, the floor locks at $50,000 permanently
- From that point forward your drawdown limit is fixed at $50,000 regardless of further gains
How TopstepX Calculates Trailing Max Drawdown
TopstepX uses intraday trailing max drawdown, which is more aggressive than Apex's end-of-day calculation. The floor moves in real time based on your highest intraday balance — not just end-of-day.
This means if your account peaks at $52,800 at 10:15am and then pulls back, your floor has already moved up based on that intraday high. You can't give back as much as you might think even if you're still in a profitable session.
Understanding whether your prop firm uses intraday or end-of-day trailing is one of the most important things to know before you start trading an evaluation.
Why Most Traders Track This Incorrectly
The most common mistake is treating trailing max drawdown like a static limit. Traders calculate their floor once at the start of the evaluation and never update it — then get surprised when they breach a limit they thought was lower.
The second most common mistake is not accounting for open positions. Most prop firms calculate drawdown including unrealized losses on open trades. If you're up $1,500 on the day but have an open position down $2,000, your effective drawdown includes that unrealized loss.
A third mistake is confusing end-of-day vs intraday trailing. A trader used to Apex's end-of-day calculation who switches to a TopstepX evaluation can get caught by intraday trailing they weren't accounting for.
How to Track Trailing Max Drawdown Correctly
Manual tracking in a spreadsheet works but it's error-prone and easy to forget to update. The correct approach is to use a tool that updates your drawdown floor automatically as your balance changes.
MyTradersEdge includes a dedicated prop firm eval tracker that calculates trailing max drawdown correctly — with a moving floor that updates based on your peak balance and locks in permanently once you hit the threshold. It supports multiple accounts simultaneously so you can track several Apex or TopstepX evaluations side by side in real time.
The eval tracker also monitors your profit target, daily loss limit, and required trading days — everything you need to know exactly where you stand in your evaluation at any point during the trading day.
The Bottom Line
Trailing max drawdown is one of the most misunderstood concepts in prop firm trading. The difference between end-of-day and intraday trailing, the lock-in threshold, and the treatment of unrealized losses are details that can end an evaluation if you don't understand them going in.
Know your firm's specific rules. Track your floor every single day. And use a tool that calculates it correctly so you're never caught off guard.
Start your free 7-day trial at mytradersedge.com — no credit card required.