Rule Breach

A rule breach is any action that violates the prop firm’s agreed rules, and it is the single biggest risk to a prop account. Breaches fall into roughly two groups: hard limits that are enforced automatically and instantly — crossing the daily loss limit or the maximum/trailing drawdown, often on floating equity — and soft or discretionary violations the firm reviews after the fact, such as news-window trades, prohibited EAs, copy-trading across accounts, or terms-of-service issues. Consequences scale with severity and firm policy: a warning, forfeiture of the specific profit, or termination of the account with no payout. Because hard drawdown breaches are mechanical and final, they cause most blow-ups, which is why disciplined position sizing matters far more than any single trade idea.

In plain English — A rule breach is any violation of the firm’s terms — touching the daily loss limit, blowing the max drawdown, trading during a restricted news window, or using prohibited automation. Depending on severity, the consequence ranges from a warning to voided profits to immediate loss of the account. Hard limits like drawdown are usually breached automatically the instant they are crossed.

On a $100,000 account with a $5,000 daily loss limit, an open position briefly drags your equity to −$5,100 on the day. That floating loss can trigger a breach and end the account — even if price snaps back seconds later.