Trailing drawdown is a moving loss limit that rises when your prop firm account reaches a new high. The account must stay above the trailing threshold. If your balance or equity touches that threshold, the firm may liquidate your positions and fail or close the account.
The threshold usually follows the account's highest recorded balance or equity. This value is called the high-water mark.
Trailing Drawdown at a Glance
| Term | Meaning |
|---|---|
| Starting balance | The account value at the beginning of the challenge or funded account |
| Trailing drawdown amount | The maximum permitted loss, such as $2,500 |
| High-water mark | The highest eligible balance or equity reached |
| Trailing threshold | The minimum value the account may reach |
| Breach | Touching or falling below the threshold |
| Intraday trailing drawdown | The threshold moves during the trading session |
| End-of-day trailing drawdown | The threshold updates after the trading day closes |
Prop firms use different names for similar rules. Topstep calls its rule the Maximum Loss Limit, while Apex Trader Funding uses terms such as Intraday Trailing Threshold. FTMO uses an end-of-day version of its Maximum Loss rule for certain account types.
How Does Trailing Drawdown Work?
A typical calculation is:
Trailing threshold = highest eligible account value - allowed drawdown
For example:
- Starting balance: $50,000
- Allowed trailing drawdown: $2,500
- Initial trailing threshold: $47,500
If the account rises to $51,000, the threshold may rise to:
$51,000 - $2,500 = $48,500
If the account later falls to $50,200, the threshold normally remains at $48,500. It does not move lower just because the account has lost money.
If the account reaches $52,000, the threshold may rise again to $49,500.
Profits can therefore make the loss limit harder to manage. A trader may still be profitable overall but breach the account after the balance or equity falls too far from its highest recorded value.
What is the Difference Between Balance and Equity?
The key difference is whether the prop firm calculates trailing drawdown using closed-trade balance or live equity.
- Balance usually reflects closed trades.
- Equity includes the account balance plus unrealized profit or loss from open positions.
- An equity-based rule can move while a trade is still open.
- An end-of-day balance rule may update only after the trading session finishes.
Apex Trader Funding states that its intraday trailing threshold uses the account's peak balance, including realized and unrealized gains. Topstep states that its Maximum Loss Limit is monitored in real time using realized and unrealized profit and loss.
Example Using Unrealized Profit
Suppose:
- Starting balance: $50,000
- Trailing drawdown: $2,500
- Initial threshold: $47,500
- An open trade creates $1,000 of unrealized profit
If the firm counts unrealized equity, the high-water mark may become $51,000. The threshold may then rise to $48,500, even if the trade later closes for a smaller profit.
This can lead to a breach after a profitable trade. The open position may have pushed the threshold higher before the trader closed it.
Intraday Trailing Drawdown Versus End-of-Day Trailing Drawdown
Intraday Trailing Drawdown
An intraday trailing drawdown updates during the trading session whenever the account reaches a new high.
The threshold may respond to:
- Realized profit
- Unrealized profit
- Open-position equity
- Market price movements
- Commissions and other trading costs, depending on the firm
A breach can occur while a position is open. Apex Trader Funding states that touching or falling below its intraday threshold can trigger automatic liquidation. The final account value may differ slightly because of execution and slippage.
End-of-Day Trailing Drawdown
An end-of-day trailing drawdown updates at a specified daily time instead of moving continuously during the session.
FTMO's published Maximum Loss rule for its 1-Step products recalculates the limit daily using the highest qualifying end-of-day balance. The limit can increase, but it does not decrease when a later end-of-day balance is lower.
This structure can be easier to manage than a real-time trailing rule because temporary intraday profits do not necessarily raise the threshold immediately. The calculation still depends on the firm's rules.
What Happens When You Breach Trailing Drawdown?
A breach normally has one of these consequences:
- Open positions are automatically liquidated.
- The evaluation account is marked as failed.
- The funded or performance account is closed.
- The account becomes ineligible for payouts or continuation.
The result depends on the provider and account type. Topstep states that a real-time breach can trigger liquidation even if the final executed balance later finishes above the limit. Apex Trader Funding similarly explains that a threshold breach can cause immediate liquidation and account closure or evaluation failure.
Treat the threshold as a hard boundary, not as a suggested stop level.
Why is Trailing Drawdown Difficult for Traders?
Trailing drawdown creates three practical problems.
1. Your Available Risk Can Shrink After Profitable Trades
A $50,000 account with a $2,500 trailing drawdown does not necessarily provide $2,500 of usable risk after the threshold moves higher.
If current equity is $51,000 and the threshold is $49,500, the remaining room is:
$51,000 - $49,500 = $1,500
The account may still be described as a $50,000 account, but the usable cushion is $1,500.
2. Unrealized Profits Can Raise the Threshold
Under an intraday equity-based rule, a temporary floating profit may increase the high-water mark. If the trade reverses, the threshold can stay higher while the account gives back the profit.
3. The Breach Can Happen Before a Trade Closes
A trader can violate the rule during an open trade even if the position later recovers. Real-time risk systems may trigger liquidation as soon as equity touches the threshold.
Trailing Drawdown Versus Static Drawdown
| Feature | Trailing drawdown | Static drawdown |
|---|---|---|
| Loss limit | Moves higher as the account reaches new highs | Remains at a fixed level |
| Effect of profit | May reduce the distance to the breach point | Usually does not move the loss floor |
| Unrealized profit | May raise the threshold under equity-based rules | Usually does not change the threshold |
| Main risk | Giving back profits can cause a breach | A fixed loss limit is easier to calculate |
| Risk management | Requires monitoring the current threshold | Requires monitoring a stable breach level |
A static drawdown is not automatically safer because its starting loss limit may be smaller. The important figure is the distance between the current account value and the active threshold.
How Should Traders Manage a Trailing Drawdown?
Use the current threshold, not the original account size, to calculate risk.
Practical rules include:
- Find the live threshold in the trading platform.
- Keep a buffer above the official breach level.
- Risk only a small portion of the remaining drawdown room.
- Include commissions, spread, and possible slippage in the calculation.
- Reduce position size after the threshold moves higher.
- Do not rely only on closed-trade balance.
- Treat temporary unrealized profit as a possible risk under an intraday rule.
- Stop trading before reaching the firm's liquidation level.
A useful calculation is:
Remaining drawdown room = current equity - current trailing threshold
For example:
- Current equity: $51,200
- Current threshold: $49,700
- Remaining room: $1,500
That $1,500 figure matters more for position sizing than the advertised $50,000 account size.
What Should You Check Before Joining a Prop Firm?
Do not compare prop firms using only the account size or profit target. Check the drawdown rules before opening an account:
- Is the drawdown static, intraday trailing, or end-of-day trailing?
- Does unrealized profit move the threshold?
- Does the threshold move after every new high or only once per day?
- Does the threshold stop trailing at a safety level?
- Are commissions and swaps included?
- Does touching the threshold cause an immediate breach?
- Are positions automatically liquidated?
- Does the threshold reset after a payout?
- Is the rule different during the evaluation and funded stages?
- Is the account simulated or live?
Prop firm rules can differ between account types, platforms, and product versions. Apex Trader Funding's published rules, for example, describe different stopping points for trailing thresholds depending on the account stage and platform.
Bottom Line
The advertised account size is a poor guide to your remaining risk. The live distance between your equity and the current trailing threshold is the figure that matters.
Before trading, confirm whether the firm trails balance or equity, when the threshold updates, and what happens when the account touches it.