A balance-based daily loss limit usually measures closed losses against a stated balance reference. An equity-based rule can also count floating P&L, so an open trade may move you closer to the limit before it is closed.
A "5% daily loss limit" sounds simple until two firms calculate it from different starting points. One may anchor the day to the previous balance. Another may compare current equity with the day's opening balance. A third may include commissions and swaps.
The safe approach is not to infer the rule from the percentage. Write the firm's definition as a formula, then test your planned risk against that formula.
What a daily loss limit actually measures
A daily loss limit is a boundary on losses within a defined trading day. It is separate from a maximum overall loss rule. Four details determine how the boundary behaves:
- Reference value: initial balance, start-of-day balance, highest balance or another defined level.
- Account value: balance only, or equity including open positions.
- Included costs: commissions, swaps and fees may count.
- Reset clock: the firm's server time can differ from your local time.
If any one of these details is missing, a percentage alone is not enough to calculate the boundary.
Balance-based vs equity-based rules
Balance changes when a trade is closed. Equity moves while a trade is open because it includes floating profit and loss. That makes equity-based monitoring more sensitive to intraday swings.
| Rule input | Balance-based | Equity-based |
|---|---|---|
| Closed losses | Usually counted | Usually counted |
| Floating loss | Often not until close | Can count immediately |
| Floating profit | Usually does not change balance | May lift equity temporarily |
| Costs | Depends on the firm's explicit rule wording | Depends on the firm's explicit rule wording |
Illustrative comparison only. A firm's current rulebook overrides this general pattern.
daily floor = reference value - allowed daily loss
remaining room = current monitored value - daily floorThe phrase current monitored value is deliberate. Under one rule it may be balance; under another it may be equity. Do not substitute one for the other.
A worked example
Assume a $100,000 account, a 5% daily limit and a $100,000 start-of-day reference. The daily floor is $95,000.
After $1,200 in closed losses, balance is $98,800. If an open position is also down $900, equity is $97,900. A balance-only view shows $3,800 of room; an equity view shows $2,900.
The difference is not a small technicality. It changes how much room remains before another position, spread expansion or commission could touch the rule.
How to size around the rule
The firm boundary should not become your trade risk target. Leave room for normal execution effects and for the possibility that several positions move together.
- Start with the firm's exact daily floor.
- Subtract closed losses, floating losses and applicable costs using the firm's definition.
- Reserve a buffer rather than allocating all remaining room.
- Size the next trade from its stop distance and risk amount.
- Recalculate when an open position or the reset clock changes the monitored value.
PipGauge can perform the arithmetic, but it cannot know whether a firm has changed its rule wording. Confirm the current rule in your dashboard or agreement before trading.
The rulebook checklist
Before treating a number as final, answer these questions from the current terms:
- Is the daily reference based on initial balance, start-of-day balance or another value?
- Does floating P&L count?
- Do commissions, swaps and fees count?
- What time and timezone resets the day?
- Can profits increase the next day's loss allowance?
- Is the limit breached intraday or checked only after a trade closes?