Drawdown Rules Decoded: Maximum Loss Limit, Daily Loss, and the Buffer That Most Rules Don't Tell You About
Drawdown rules kill more prop firm accounts than any other single factor. Not because they’re complicated — but because most traders hold a conceptually incorrect model of how they work until their first breach.
This article installs the correct mental model. Starting from first principles, building to firm-specific implementations.
Two Separate Drawdown Systems
Prop firms typically implement two independent drawdown controls that operate simultaneously:
System 1: Maximum Loss Limit (MLL) / Total Drawdown
- The absolute floor for your account equity
- If equity falls below this, the account terminates
- May be static (fixed dollar amount) or trailing (moves up with equity)
System 2: Daily Loss Limit
- A separate, smaller limit that resets every trading day
- If equity falls below this within a single session, trading is paused or the account terminates for that session
- Calculated independently from the MLL
These two systems interact, but they operate independently. You can breach the daily loss limit while having substantial MLL buffer remaining. You can also breach the MLL (in a catastrophic session) without having previously triggered the daily loss limit.
The common mistake: traders focus entirely on the daily loss limit as their risk management signal and don’t model the MLL correctly. On days without a daily loss limit (Topstep evaluation, for example), the only active constraint is the MLL — and the absence of a daily signal means some traders have no early warning before reaching the terminal floor.
EOD Trailing vs. Intraday Trailing: The Most Important Distinction in Prop Trading
End-of-Day (EOD) Trailing
Mechanism: The MLL floor is calculated at the close of each trading session. It moves upward only when your account closes at a new equity high. Intraday equity movements — up or down — do not affect the floor during the session.
| Session Start | Intraday High (Unrealized) | Session Close | Floor Movement |
|---|---|---|---|
| $50,000 | $53,000 | $51,000 | ✅ Moves up based on $51K close |
| $51,000 | $54,000 | $50,800 | ❌ No movement (didn’t close higher) |
| $50,800 | $52,000 | $52,500 | ✅ Moves up based on $52.5K close |
The floor in this scenario moves based on $51K then $52.5K closes — not based on the intraday highs of $53K and $54K.
The advantage: Managing unrealized positions is less penalized. You can hold a trade through a temporary peak without locking in a drawdown constraint based on that peak.
Intraday Trailing
Mechanism: The MLL floor tracks the highest equity point in real-time. Every new equity peak — including unrealized — immediately ratchets the floor upward. This movement is permanent: the floor never moves down, even if the session closes lower.
| Session Start | Intraday Peak Equity | Session Close | Floor Movement |
|---|---|---|---|
| $50,000 | $53,000 (unrealized) | $50,500 | ✅ Floor moved to account for $53K peak |
The floor adjusted based on the $53,000 unrealized peak — even though you closed at only $50,500. The gap between your close price and your floor is now much smaller than if you had EOD trailing.
The risk: A strategy that regularly produces large unrealized gains before taking profit will continuously ratchet the floor with each intraday peak. Over time, the operational buffer between your typical close price and the floor compresses to the point where a single recovering day cannot prevent termination.
Static vs. Trailing: The Third Variation
Some firms offer static drawdown: the MLL floor is set at the start of the evaluation and never moves, regardless of equity growth.
| Account Type | Floor Movement |
|---|---|
| Static | Fixed forever at starting balance minus MLL |
| Trailing (EOD or Intraday) | Moves up with equity, never down |
Static drawdown is the most favorable from a pure loss-protection standpoint: no matter how much you profit, your downside protection floor never narrows. However, for firms that use trailing drawdown that could shrink over time toward a static floor through account equity growth, the floor may effectively “lock” at a higher level after enough accumulated profit.
The Buffer Balance Concept
Some firms add a third constraint separate from MLL and daily limits: a minimum balance requirement for payout eligibility.
At Topstep’s Express Funded account, for example:
After each payout, your account balance must remain at or above the “eligible payout balance” — meaning the balance immediately after your last payout.
If you extract too aggressively and your account balance drops below the post-payout threshold, you can’t request another payout until you’ve rebuilt the balance above that level. The account isn’t terminated — but it’s locked from further extraction.
This buffer concept is operationally significant for farmers and burst traders alike. Calculate the minimum post-payout balance threshold before requesting each extraction to ensure the account remains payout-eligible.
FTMO’s Real-Time Float Calculation
FTMO’s drawdown is calculated against account equity (not just closed P&L), meaning floating unrealized losses count toward both the daily loss limit and the MLL simultaneously.
A long position with $5,000 in unrealized loss on a $100K account immediately reduces your effective equity to $95,000 — and if that hits the 5% daily limit ($95,000 from a $100K start), the session terminates, even if you believe the trade will recover.
This makes FTMO’s drawdown system materially more restrictive than EOD trailing firms during high-drawdown periods. A trade that would survive under an EOD system (because you close green) might breach FTMO’s daily limit mid-session during the drawdown period before recovery.
Per-Firm Drawdown Summary
| Firm | MLL Type | Daily Loss Limit | Float Included |
|---|---|---|---|
| Topstep (Eval) | EOD Trailing | ❌ None | Not specified per tick |
| Topstep (Funded) | EOD Trailing | ✅ Yes | At session level |
| Apex (Intraday track) | Intraday Trailing | ❌ None | Peak-based |
| Apex (EOD track) | EOD | ✅ Yes (session pause) | EOD |
| FTMO | Real-time | ✅ 5% daily | ✅ Open positions counted |
| Tradeify Select | EOD Trailing | ❌ Eval: None / Funded Flex: None | EOD |
| Alpha Futures | Daily balance-based trailing | ❌ Eval: None | EOD |
Spend time understanding which column applies to your specific account before your first session. These distinctions determine the difference between a recoverable bad day and a terminated account.
