Start with the firm's rules, not the copier
A prop-firm account fails on rules, not on bad luck. Before copying anything into a challenge or funded account, write down your firm's answers to five questions. They are in the firm's FAQ or terms; if they are not clear, ask support and keep the answer.
- Is copy trading allowed, and from which sources: your own accounts, third-party signals, both or neither?
- How is the daily loss measured, and when does the firm's day start?
- Is the maximum drawdown static or trailing?
- Are there news, weekend-holding or minimum-holding-time rules?
- Is trading identical positions on several accounts (yours or other people's) allowed?
How daily loss limits are actually measured
"5% daily loss" can mean several different things:
| Variant | Line for the day | What it means for you |
|---|---|---|
| Balance-based | Day-start balance − 5% | Open losses from yesterday are not counted in the base. |
| Equity-based | Day-start equity − 5% | A trade carried overnight in profit raises the base; giving it back counts as loss. |
| Higher of the two | max(balance, equity) − 5% | The strictest version; common at many firms. |
In every variant the limit is usually checked on equity, including open losses. A position that is −4.8% at its worst point fails a 5% account even if it recovers by the close. Also note the reset time: many firms reset at midnight of their server time or at 17:00 New York, not at 00:00 UTC.
Static and trailing maximum drawdown
A static maximum drawdown is a fixed line, for example $90,000 on a $100,000 account. A trailing drawdown follows your highest balance or equity up: reach $104,000 and the line moves to $94,000. Trailing drawdowns punish strategies that give back open profit, which copied trades often do because they follow someone else's exit timing.
Our drawdown recovery calculator shows how many losing trades in a row you can afford at a given risk per trade before you reach either line.
Sizing that fits the limits
Work backwards from the daily limit. Decide how many full stop-outs in one day you must be able to survive, and size so that number of losses stays inside the line with a buffer.
A $100,000 challenge with a 5% daily limit
- Daily limit: $5,000. Keep a buffer: plan for $3,500.
- Survive four full losses in a day → $875 per trade, about 0.9% risk.
- With risk percent at 0.85% and a max lot cap that matches your usual stop, no single source trade can take more than that.
If you mirror a master account rather than signals, use risk by equity and a max lot cap. Equity-based sizing shrinks new trades while the account is in drawdown, which is what you want near a limit.
Guard rails before the firm's
An equity rule on the account that acts before the firm's line is the most valuable setting you can add. In CopyTraderTool this is EquityShield:
- A daily loss percent rule with day-start equity as baseline, set 1–1.5% inside the firm's daily limit, action "alert, pause copiers and close all".
- A protect value rule at the static drawdown line plus a buffer.
- Optionally a target rule that pauses copiers once the challenge target is reached, so a late loss can't undo a pass.
Remember that our daily rules re-arm at 00:00 UTC; if your firm's day starts at another time, the buffer has to cover the difference. And because equity can move past any line between checks, especially on news, a rule is a safety net, not a guarantee. See drawdown protection.
News, weekends and consistency rules
- News: a news filter pauses new entries around high-impact events, but doesn't close trades already open. If the firm forbids holding through news, you have to close manually or pick a source that is flat on news.
- Weekends: block new entries late on Friday with a time filter; existing trades stay open unless closed.
- Consistency: rules that cap the share of profit from one day are easier to meet with a fixed risk per trade than with mirrored lots that vary wildly.