Propfirmfunπ Drawdown Rules
Drawdown Rules in Prop Trading
Drawdown rules often determine whether a trading strategy can survive within a prop firmβs risk framework. Two firms may advertise similar drawdown percentages while applying them in very different ways.
This guide explains daily vs. maximum drawdown, fixed vs. trailing drawdown, and balance vs. equity calculations, with practical examples and the edge cases that can materially affect a traderβs account.
The Two Limits: Daily and Maximum
Almost every prop firm applies two drawdown limits at the same time. Understanding both is essential because breaching either one can result in an account failure or termination.
Daily Drawdown
Daily drawdown is the maximum loss permitted during a single trading day. It is calculated from a reference point that typically resets at the beginning of each trading day. Reaching the daily limit can trigger an account breach even when the account remains safely above its overall maximum-drawdown level.
Maximum (Overall) Drawdown
Maximum drawdown is the largest loss permitted over the life of the account. The calculation begins from a reference point established when the account opens and may change depending on whether the firm's rule is fixed or trailing.
Reaching the maximum drawdown limit can terminate the account regardless of the day's individual profit or loss.
Both limits can apply simultaneously, and either one can cause a breach independently. At any given point, the binding constraint is the drawdown limit that leaves the smallest amount of remaining room before a violation.
The First Axis: Fixed vs. Trailing
The reference point used to calculate maximum drawdown is generally either fixed or trailing. This distinction explains many of the differences traders encounter between prop firm programmes.
Fixed Drawdown
With fixed drawdown, the account's drawdown floor is established when the account begins and remains unchanged. Profits do not move the floor upward, and subsequent losses do not move it downward.
This structure is relatively straightforward to calculate and is particularly common in futures prop trading programmes.
Trailing Drawdown
With trailing drawdown, the account's drawdown floor moves upward as the account reaches new profit levels but does not move back down when the account declines.
There are two common variations:
Intraday trailing: The drawdown level can update during the trading session based on the account's highest equity, including unrealised profits. This can make the rule more restrictive because temporary profit spikes may raise the floor immediately.
End-of-Day (EOD) trailing: The drawdown level is recalculated only at the end of the trading day, typically using the firm's specified balance or equity calculation. This can provide more room for intraday fluctuations because temporary gains do not immediately move the floor.
Intraday Trailing β The Harder Version
Some firms calculate the trailing drawdown floor using the highest unrealised equity reached during the trading session, rather than the account's closing balance.
For example, if an account reaches a temporary unrealised equity peak of $60,000 on Day 2 and the trailing drawdown is $5,000, the floor could move to $55,000. If the account later falls to $48,200, the trader would already have breached the drawdown limit, even if the $60,000 level was never locked in as realised profit.
If a firm's rulebook does not clearly state whether its trailing drawdown is calculated intraday or at end of day, contact the firm's support team and obtain clarification before purchasing an evaluation.
The Second Axis: Balance-Based vs. Equity-Based
Drawdown calculations generally use either account balance or account equity as the reference:
Balance-based: The calculation uses the account balance after closed trades. Unrealised profit and loss from open positions is generally excluded until the position is closed.
Equity-based: The calculation includes both the account balance and unrealised P&L from open positions. An open position moving against you can therefore reduce your available drawdown immediately.
The same advertised "10% drawdown" can therefore create very different risk limits depending on the calculation method. Under an equity-based rule, an open position that temporarily moves significantly against you may consume part of your drawdown allowance even if the trade later recovers and closes profitably.
Daily Drawdown β The Same Axes, Applied Per Day
Daily drawdown uses the same basic distinctions as maximum drawdown β fixed vs. trailing and balance-based vs. equity-based β but its reference point resets at the beginning of each trading day rather than remaining tied to the account's opening level.
For example, a 5% daily drawdown on a $50,000 account equals $2,500. However, the firm's rules determine exactly how that $2,500 limit is calculated. The reference point could be yesterday's closing balance, today's starting balance, today's highest equity, or another value defined by the firm.
For traders who scalp or take many smaller positions, daily drawdown is often the binding constraint because frequent trading can consume the daily loss allowance quickly. For swing traders who maintain relatively small positions over several days, maximum overall drawdown may be more important, although the specific rules still need to be checked.
Edge Cases That Catch Traders Out
Commissions counted in drawdown. Some firms include commissions and swap charges when calculating equity and drawdown, while others use different methods. High-frequency traders should determine whether accumulated trading costs can materially reduce their daily buffer.
Inactivity adjustments. A small number of firms may modify or reset certain trailing references after extended periods of inactivity. Do not assume the drawdown level remains unchanged without checking the firm's current rules.
Weekend gap risk under equity-based rules. If you hold a position through the weekend and the market opens significantly against you, an equity-based drawdown calculation may register a breach immediately, potentially before you can close the position.
Profit payout and trailing-floor resets. Some firms may adjust the drawdown reference after a payout, while others continue calculating the trailing floor from the account's existing high-water mark. This can materially affect traders who regularly withdraw profits.
News-trading buffer rules. Some programmes impose additional restrictions or modify risk parameters around major economic announcements. Always verify the exact restricted instruments, time windows, and drawdown treatment rather than relying on a general statement about news trading.
Sizing Positions to the Drawdown Rule, Not the Account
One of the most common mistakes when trading funded accounts is sizing positions based on the headline account balance rather than the firm's actual drawdown allowance. In practice, the drawdown floor is often the more important risk constraint.
A useful rule of thumb is to limit the risk of a single losing trade to roughly 10β20% of the daily drawdown buffer. For example, on a $50,000 account with a $2,500 daily drawdown, risking approximately $250β$500 per trade keeps one loss from consuming too much of the available daily buffer.
This can be more conservative than simply applying a 1% account-risk rule. A 1% calculation would produce $500 per trade, but if the firm's daily drawdown is the binding constraint, several consecutive losses could quickly bring the account close to a breach.
The same principle applies to maximum drawdown. Position sizing should leave enough room for a realistic series of losing trades to occur over multiple sessions without approaching the overall drawdown floor too quickly.
How to Read a Firm's Drawdown Disclosure
For each limit, record the following:
1. Dollar amount calculate the actual dollar limit yourself rather than relying only on the advertised percentage.
2. Fixed or trailing determine whether the threshold remains constant or moves with account performance.
3. Balance-based or equity-based establish whether unrealised P&L is included.
4. Reference point identify whether the calculation starts from account opening, the beginning of the trading day, a running high-water mark, or another reference.
5. Update timing determine whether the calculation changes intraday, at end of day, or at another specified interval.
If any of these details remain unclear after carefully reviewing the rulebook, treat that uncertainty as meaningful information. Ask the firm's support team for a written explanation and retain the response, or consider another programme with clearer documentation.