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Prop Firm Rules, Explained

Funded accounts don't fail because traders can't trade — they fail because traders don't understand the rules. Here's every common one, and the single rule that ends the most attempts.

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Track where your real stop-out level sits as your balance moves — the rule that fails most accounts.

Open the Trailing Drawdown Calculator →

Prop firms — the funded-account kind — let you trade the firm's capital after you pass an evaluation, keeping a share of the profits. The appeal is trading real size without risking a big account of your own. The catch is a set of rules that fails far more people than bad trading does. Here's what each one means.

The profit target

To pass an evaluation you usually have to reach a profit target — a set percentage gain — while staying inside every other rule. It's the "prove you can trade" bar. The trap is chasing it too aggressively and breaking a risk rule in the process.

The maximum drawdown — usually the account-killer

The maximum drawdown is the most you can lose before the account is done, and it's most often trailing: it rises as your balance hits new highs but doesn't drop back when you give profits back. That means it can creep up to sit just beneath your account and stop you out on an ordinary pullback — even while you're still up on the challenge overall. This one rule ends more attempts than anything else, which is why it's worth understanding cold. Read the deep dive in trailing drawdown, explained, and track your real stop-out level in the trailing drawdown calculator.

The daily loss limit

Separate from the overall drawdown, a daily loss limit caps how much you can lose in one day. Hit it and you're done for the session, even if your total drawdown is fine. Its job is to stop tilt — the revenge-trading spiral after a bad morning that turns a small loss into a blown account.

The consistency rule

Many firms add a consistency rule: no single day (or trade) can be more than a set share of your total profit — commonly 20–50%. It stops people from passing on one lucky gamble and forces steadier results. Percentages vary by firm, so check the exact number.

Minimum trading days and prohibited strategies

How to actually pass

The winning approach is boring on purpose: risk a small, fixed amount per trade with the position size calculator, respect the daily limit so one bad day can't end you, and keep your biggest day well under the consistency cap. The rules reward survival, not heroics — trade like the drawdown is right beneath you, because it usually is.

This is educational information, not financial advice. Every firm's rules differ — always read the specific program terms.

Frequently asked questions

How do prop firm trading rules work?

A funded-account prop firm gives you a simulated or funded account with rules you must follow: a profit target to pass the evaluation, a maximum drawdown (often trailing), a daily loss limit, and usually minimum trading days and a consistency rule. Break a hard rule — like the drawdown — and the account is failed or closed.

What is the hardest prop firm rule to pass?

The trailing maximum drawdown ends more attempts than anything else. It rises as your balance rises but doesn’t fall when you give profits back, so it can sit just beneath your account and stop you out on a normal pullback. Tracking your real stop-out level is essential.

What is a daily loss limit?

A cap on how much you can lose in a single trading day, separate from the overall drawdown. Hit it and your day (or account) is done, even if you’re still within the total drawdown. It’s designed to stop tilt and revenge trading.

What is a consistency rule?

A rule that no single day (or trade) can make up too large a share of your total profit — often 20–50%. It stops traders from passing on one lucky gamble and forces steadier results. Check each firm’s exact percentage, as they differ.

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TradeCaliper is a planning and education tool, not financial advice. Published 2026-07-24.