Daily loss and maximum drawdown are the two figures a prop firm trader must know before placing any order. A profitable trade can wait; a breached loss limit normally closes the account immediately or makes it ineligible to pass.
This guide focuses on the calculations. For the wider meaning of profit targets, consistency rules and other conditions, read our complete prop firm rules explainer.
Daily loss and maximum drawdown are not the same
Daily loss limit controls how much the account can lose during one defined trading day. It usually resets at a specific server time.
Maximum drawdown controls how far the account may fall overall. Depending on the programme, its threshold may remain fixed or move upward when the balance or equity reaches a new high. A trader must remain inside both limits at the same time.
Find the firm’s exact calculation method first
Do not assume that a “5% daily loss” rule is calculated in the same way everywhere. Check the current programme terms for:
- Whether the rule is based on balance, equity or both
- Whether floating profit and loss is included
- Whether commissions, swaps and other fees count
- The time zone and hour at which the daily figure resets
- Whether previous-day profit increases the next day’s allowance
- Whether maximum drawdown is static, trailing or end-of-day trailing
The programme selected during purchase matters. A firm can offer multiple challenges with different calculations, even when the advertised account size is the same.
How to calculate a percentage-based daily loss limit
If a $100,000 account has a daily loss limit of 5%, the headline daily allowance is:
$100,000 × 5% = $5,000
That does not automatically mean the trader can lose another $5,000 from the current equity. The starting reference and the treatment of the day’s closed profit or loss determine the remaining room.
Example with closed and floating losses
Assume the rule measures total daily loss using closed results, floating results and fees:
- Starting reference balance: $100,000
- Maximum permitted daily loss: $5,000
- Closed loss today: $1,200
- Current floating loss: $1,500
- Commissions and fees: $100
Total daily loss is:
$1,200 + $1,500 + $100 = $2,800
The remaining room before the official limit is:
$5,000 − $2,800 = $2,200
Using all of that remaining room would be extremely risky because slippage, spread changes or another open position can move equity past the threshold.
Why today’s profit may not create permanent room
Suppose a trader makes $2,000 early in the day and then loses $5,500. The account may still display a net daily loss of $3,500 compared with the day’s starting point, but the firm’s formula may treat the maximum daily loss differently. The result can also change when the daily reset occurs while positions remain open.
Never use intraday profit as permission to increase size until you know exactly how the firm treats the day’s starting balance, realised result and open equity.
Understand the daily reset time
The “trading day” may follow the firm’s server time rather than the trader’s local midnight. For an Indian trader, a reset based on New York, Central European or another server time can occur at an unexpected local hour and may shift with daylight-saving changes.
Record the reset in your own time zone and confirm whether positions held across it carry their floating profit or loss into the new day’s calculation. A trade that looked comfortably within limits before the reset can use a large portion of the new daily allowance afterward.
How static maximum drawdown works
A static drawdown threshold does not move upward when the account makes profit.
For a $100,000 account with a 10% static maximum loss:
Maximum loss amount = $100,000 × 10% = $10,000
Failure threshold = $100,000 − $10,000 = $90,000
If the balance rises to $106,000, the threshold remains $90,000. The trader now has a larger cushion, but the original floor has not changed.
How trailing drawdown works
A trailing threshold rises with the account’s performance. The exact method varies:
- Intraday trailing: the threshold may follow the highest equity reached, including unrealised profit.
- End-of-day trailing: the threshold may update from the balance or equity recorded at the end of a session.
- Balance-based trailing: only closed profits may move the threshold.
- Locked trailing: the threshold may stop moving after it reaches the starting balance or another specified level.
End-of-day trailing example
Consider a $50,000 evaluation with a $2,000 trailing drawdown:
| Stage | Account balance | Drawdown floor | Available room |
|---|---|---|---|
| Starting point | $50,000 | $48,000 | $2,000 |
| After a $700 profitable day | $50,700 | $48,700 | $2,000 |
| After a later $400 loss | $50,300 | $48,700 | $1,600 |
The floor does not normally move back down after a losing day. That is why withdrawing profit or giving back a winning streak can leave less usable room than the account’s headline size suggests.
Balance versus equity
Balance reflects completed transactions. Equity includes the current value of open positions. If the rule is equity-based, an open trade can breach the account without being closed. For example, a balance of $98,500 may appear safe above a $95,000 floor. But if open positions are losing $3,700, equity is only $94,800 and the rule may already be breached.
Include every cost in the calculation
Depending on the terms and platform, the loss calculation can include:
- Trading commissions
- Spread paid on entry and exit
- Overnight financing or swaps
- Exchange and data fees
- Currency conversion effects
- Open losses across all positions
This is why the dashboard’s remaining-loss figure should be monitored alongside the trading platform. If the two appear inconsistent, stop opening new trades and ask the firm’s support team how the rule is being calculated.
Create your own safety buffer
The official limit is an account termination level, not a sensible daily target. A trader can set a personal stop well inside it. On an account with a $5,000 official daily limit, a personal cap of $750 or $1,000 provides room for platform costs and unexpected price movement. The guide on passing a prop firm challenge without overtrading explains how to combine this buffer with a maximum number of trades and a stop after consecutive losses.
A daily drawdown worksheet
- Write the day’s official reference balance or equity.
- Record the daily-loss threshold in currency, not only as a percentage.
- Add today’s closed losses, floating losses and applicable costs.
- Subtract the total from the official allowance.
- Subtract an additional personal safety buffer.
- Compare the result with the cash risk of every open stop.
- Stop trading when the personal limit is reached.
Final takeaway
The displayed account size is not the amount a trader can actually risk. Usable risk is the distance between current equity and the applicable loss threshold, reduced further by open exposure and a safety buffer. Recalculate that distance every day and whenever a trailing threshold moves.
