Guide
How prop-firm rules on daily loss, trailing drawdown, news trading, consistency and EA usage interact with automated tools, and how to check a tool against a specific firm before you pay for a challenge.
7 min readPublished
Proprietary trading firms sell evaluation challenges: pay a fee, trade a demo account within a set of rules, and receive a funded account if you pass. Expert Advisors are attractive here because they trade consistently and without emotion — and dangerous because a rule breach is instant and final. A tool with a fine long-term record can fail a challenge in an afternoon by exceeding a daily loss limit it was never told about. This guide explains the rules that matter, how each one interacts with automated tools, and how to check a specific tool against a specific firm before spending money on either.
Every firm publishes its own rule set, and firms change them, sometimes with little notice. What follows describes the common patterns, not any particular firm. Read the current rules on the firm's own site before relying on anything here, and keep a copy of the version you agreed to. Nothing on this page is a recommendation of any firm.
Most firms permit Expert Advisors, but with conditions. Common ones: no high-frequency or latency-arbitrage strategies, no “tick scalping”, no copying trades between accounts at different firms, and no use of an EA that many other clients are also running (some firms cancel accounts whose trades match other accounts too closely). A few firms require you to disclose the EA. Check the “prohibited strategies” section; if a tool's strategy type is named there, stop.
Because widely sold EAs can produce identical trades across many accounts, tools sold here for prop-firm use typically include randomisation inputs — small variations in entry timing or size — precisely to avoid the “copy trading” flag. The product page states whether these exist. Their purpose is to keep your account distinguishable, not to hide anything, and firms are aware of them.
The most breached rule. Firms define a maximum loss per day — typically 4–5% of the starting balance — measured on equity, so open losses count. The day usually resets at a fixed server time. An EA that holds several positions overnight can breach the limit while you sleep as floating losses grow, even if the trades would eventually have recovered.
What to check in a tool: whether it has a daily loss input measured on equity, whether it closes positions or merely stops opening new ones when the limit is reached, and whether its daily reset time can be aligned to the firm's server time. Risk management controls explains the difference between a daily limit that stops new trades and one that flattens the account; for prop firms you need the latter, set with a buffer below the firm's threshold.
Two designs exist. A static drawdown is measured from the initial balance — lose 10% from the start and you are out, regardless of profits in between. A trailing drawdown follows your high-water mark — after you are up 6%, the limit moves up too. Trailing drawdown punishes strategies that give back open profit, including anything with wide targets or trailing stops that let positions breathe. Compare the firm's overall drawdown with the tool's worst historical equity drawdown (see Understanding drawdown) and plan for the live figure to be larger.
Many firms forbid opening or closing positions within a window around high-impact scheduled news — commonly two minutes either side, sometimes longer — on affected symbols. Some also forbid holding positions through news. An EA that does not know the calendar will breach this rule on the first non-farm-payrolls release. Look for a built-in news filter with configurable windows and the ability to close before events, or pair the EA with a separate news-protection utility such as those in the utilities category. Verify how the filter obtains its calendar; a filter that depends on an external website can fail silently when that site changes.
Some challenges forbid holding positions over the weekend; some funded accounts forbid it while the challenge allowed it. A swing EA that holds for days is incompatible with such rules unless it has a “close all before Friday close” input. Check the tool's session settings and confirm the close time is in the firm's server timezone, not yours.
Consistency rules limit how much of your total profit can come from a single day (for example, no single day may exceed 30–40% of total profit). Minimum trading day rules require trades on a set number of distinct days. A tool that trades rarely but wins big can breach the first; a tool that trades only in specific conditions can fail the second within the challenge period. Compare the tool's typical trade frequency and profit distribution with the rules.
Firms cap leverage (often lower than retail brokers) and some cap lot size per position or in total. Tools with risk-based sizing usually handle this, but check that the maximum-lot input exists. Hedging — holding buy and sell on the same symbol — is prohibited by some firms and impossible on netting accounts; grid and basket tools often depend on it. See MT4 vs MT5 for account modes.
Product pages here state which of these controls a tool provides and the account types it supports. The prop-firm category lists tools whose authors designed them with these rule sets in mind, and tools such as Titan Prop exist primarily to enforce firm-style limits around other strategies. What we cannot do is verify compliance with a specific firm's current rules, because those rules change and are applied at the firm's discretion. Compatibility is something you confirm against the rule document you signed, on a demo account, before a challenge fee is paid.
The inputs that keep an automated strategy inside your limits: position sizing, hard stops, daily and equity loss limits, exposure caps, spread and news filters, and how to test that each one actually fires.
How to evaluate an Expert Advisor backtest report: modelling quality, spread and commission assumptions, sample size, optimisation bias and the signs a curve was fitted rather than earned.
Maximal, relative, absolute and floating drawdown explained, why the figure in a backtest report is a floor rather than a ceiling, and how to size an account around it.
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