Most blown accounts are not one bad idea. They are a bad morning followed by a worse afternoon, taken by someone who had already decided they would stop at -2%. A daily loss limit that depends on you noticing is a wish. This is how to make it a mechanism, and where the mechanism stops.
Why a manual limit fails at exactly the wrong moment
A loss limit has to work when you are least able to enforce it: after a run of losers, mid-session, with an open position that "just needs a little longer". That is when judgement is worst and the urge to win it back is strongest. The only reliable version is one that does not ask you.
The same applies if you run rules rather than click trades. An automated rule has no morale, which is its virtue, but also means a rule that is wrong in current conditions will keep being wrong, consistently, all day.
Measure equity, not balance
Balance only moves when a trade closes. Equity includes floating profit and loss, so it falls while a losing position is still open. A limit on balance reacts after the damage; a limit on equity reacts while it is happening. If your limit is meant to protect you from a drawdown, it has to read the number that contains the drawdown.
How the brake works in chartTrigger
Each account has an optional daily loss threshold, set as a percentage of the day's starting equity, as a fixed amount, or both. Zero means off.
- The engine records the account's equity as the day's reference point.
- On each equity reading it compares the current equity to that reference.
- If the loss reaches your percentage or your amount, whichever comes first, the brake engages on that account.
- A braked account is skipped by every rule. Each skipped order is recorded with the reason, so the record shows why nothing was sent.
- You are notified, and the event is written to the audit trail.
The brake stays engaged until you release it. It does not quietly reset itself at midnight, which is deliberate: if the point was to make you stop, being re-enabled by the clock defeats it. You can also pull the brake by hand for one account, for a whole cohort, or across everything.
What it does not do
- The verified behaviour is that rules stop sending new orders to a braked account. Do not assume it closes positions already open, and it cannot stop orders you place by hand in the broker's own app.
- The day is measured in UTC. Your prop firm's day may reset at a different hour in a different time zone.
- It is checked on equity readings, not on every tick. A violent move between readings can overshoot the line.
Prop-firm accounts: set it tighter than their limit
Funded-account rules vary in ways that matter: some measure the daily loss from the day's starting balance, some from starting equity; some reset at a fixed server-time hour; some use a trailing maximum drawdown rather than a static one; some count floating loss and some count it differently. Read your firm's definition word for word and compare it to the above.
The sensible way to use an automatic brake is as an early warning inside your firm's limit, not as a replica of it. If the firm's limit is 5%, a 3% brake leaves room for the overshoot, the time-zone mismatch and the position that was still open. The brake is there to protect the account from you, not to argue with the rulebook.
Setting it up
- Open the account's settings and enter a daily loss percentage, an absolute amount, or both.
- Choose it deliberately below any external limit you are bound by.
- Make sure a notification destination is verified, so a trip reaches your phone.
- Test it on a demo account. Set an absurdly small threshold, let a rule fire, and confirm the brake engages, the next order is skipped with a reason, and you are told. A safety mechanism you have not watched trip is an assumption.
The same brakes work across a multi-account setup, where per-account limits matter most: one account can be stopped while the others carry on.
Common questions
Should a daily loss limit use balance or equity?
Equity. Balance only changes when a trade closes, so a limit on balance reacts after the loss. Equity includes floating profit and loss and falls while the losing position is still open.
Does an automatic brake close my open positions?
Do not assume it does. The verified behaviour in chartTrigger is that rules stop sending new orders to a braked account. Handle open positions deliberately, and test the behaviour on a demo account before relying on it.
Why is my prop firm's daily drawdown different from my own limit?
Firms define the day, the reference figure and the treatment of floating loss differently, and often reset at a fixed server-time hour. Set an automatic brake tighter than the firm's limit rather than trying to copy it exactly.
Does the brake reset itself the next day?
No. It stays engaged until you release it, so you consciously decide to resume rather than being re-enabled by the clock.
Put a ceiling on a bad day
Daily loss percentage or amount per account, a brake you can pull by hand, and an audit line for every trip.
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Risk note. This article is educational material about how chartTrigger works. It is not investment advice, not a recommendation to trade any instrument, and nothing here forecasts results. Trading leveraged products carries a high risk of loss. Any historical simulation referred to is exactly that — a run over past bars under stated spread and slippage assumptions, not an indication of future performance.