A daily loss limit is the most you are allowed to lose in one trading day before the account is finished. Breach it and the evaluation ends, or the funded account is revoked. There is no appeal, because it is not a judgement, it is arithmetic.
Every prop firm has one. Most people who fail a challenge fail on this rule rather than on the overall profit target, and most of those failures happen in the first week.
The two limits are not the same rule
Firms enforce two drawdown rules simultaneously, and they interact in ways that surprise people.
Daily drawdown resets. Typically five per cent of your starting balance for the day, measured from whichever baseline your firm uses. Breach it and you are out. Survive the day and it resets overnight, and you start again with the same allowance.
Maximum drawdown does not reset. Typically ten per cent, measured from your starting balance or from your highest achieved balance, depending on the firm. This is the floor under the whole account for its entire life.
You can be comfortably inside your maximum drawdown and still fail on daily. You can also have several individually acceptable days that walk you into a maximum drawdown breach. They are separate tests and you have to pass both, every day.
The details that decide whether you breach
Does it measure balance or equity? This is the one that catches people. Most firms measure equity, which includes your open floating losses. So a position running twenty pips against you counts toward the limit right now, before it is closed and before you have decided anything. A trader watching their closed profit and loss, thinking they have room, can already be in breach.
When does the day roll over? Usually a fixed server time, often 5pm New York, which for a European trader is the middle of their evening. A trade held across that boundary is measured against the old limit before it and the new one after, and people misjudge this constantly.
What is the baseline? Some firms measure daily drawdown from the balance at the start of the day. Others measure from the higher of balance or equity at the start. Others use a trailing figure. The difference is substantial on a day where you were up early and then gave it back. Read the specific rulebook; the general answer is not reliable.
Does it trail? A trailing maximum drawdown follows your peak equity upward. Get an account to plus eight per cent and your floor may have moved up with it, which means the loss that ends the account is now much smaller than the one you started with. This is the rule people understand last and pay for most.
Firms differ on all four points. The5ers, FTMO and the futures-focused firms each set these differently, and a strategy that is comfortable under one rulebook can be unworkable under another.
The failure pattern
The trade that kills the account is almost never the first loss of the day. It is the one after.
The shape is consistent. A morning trade goes wrong. It is annoying, and it uses up a chunk of the daily allowance but leaves room. Then comes the decision to make it back, which means a bigger position, taken faster, on a setup that would not have been taken an hour earlier. That trade is where the breach happens.
Nothing about this is an information problem. The trader knows the limit. They can see the number. What fails is the capacity to sit still after a loss, which is a different faculty entirely and one that degrades precisely when it is needed.
The second common route is slower and involves no emotion. Several small losing days in a row, each comfortably inside the daily limit, walking the account down into the maximum drawdown. Nothing dramatic happens on any single day. The account just runs out of floor.
What an automated daily loss cap has to do
A tool that enforces a daily loss limit is only useful if it does three things. Anything less and it is theatre.
Flatten open exposure, not just block new trades. A halt that stops new entries and leaves existing positions running has not stopped the bleeding. Those positions carry on losing and the account breaches anyway, twenty minutes after the tool told you it had halted. Closing open positions and cancelling pending orders is the part that does the work.
Set the threshold per account. If you run a prop account alongside a live account, a halt on one must not touch the other. They have different rules and different limits, and one global switch is the wrong shape.
Resume without erasing the day. This is subtle and it matters. If pressing Resume resets the baseline to your current equity, the day's loss that triggered the halt quietly disappears, and your allowance starts fresh. You can then breach again, and again, each resume moving the goalposts. Resume should lift the halt and nothing else. Moving the baseline after a genuine deposit or withdrawal is a separate decision you make deliberately.
A fourth thing, less essential but worth having: an audit trail. Every halt written down, with what tripped it and when. After a bad session the useful question is which trade took you from comfortable to halted, and memory is not a reliable way to answer it.
Set it tighter than the firm does
The firm's limit is the point at which you fail. It is not a target.
If the rule is five per cent, set your own halt at three or three and a half. The gap absorbs spread, slippage, a position that gaps on you, and the difference between what you think your equity is and what the firm's server thinks at the moment it checks.
Traders who set their halt at the firm's exact number fail on the arithmetic of the last trade, not on strategy.
The honest limits of all this
A daily loss cap does not make you profitable. It stops one specific failure mode, which is the loss spiral inside a single session. If your edge is negative, an automated halt means you lose slowly and within the rules rather than quickly. It buys time. It does not create an edge.
It also cannot help with the second pattern, the slow walk down over many compliant days. Only position sizing and honest assessment of the strategy address that.
What it removes is the version of failure where the trader knew the right answer and did the other thing anyway, at the worst moment, on the second loss of a bad morning. That version is common enough to be worth engineering out of your own process.
TTMT enforces a per-account daily loss limit that flattens exposure when it fires, keeps session counters across a resume, and writes an audit record for every halt.
Related: what a signal copier is, and what lot size actually means.
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