Many prop firms enforce what is called a one minute rule. This rule means you cannot open and close a trade within the same one minute candle. If a position is closed before one full minute passes, it can be considered a rule violation.
For scalpers, this rule is a big problem.
Scalping relies on quick entries and exits, often holding trades for seconds or a few ticks. When a one minute rule is in place, that trading style simply does not fit. Even if the trade is profitable, it can be flagged or voided because the holding time is too short.
Another issue is spreads. When spreads widen, scalpers usually exit quickly to control risk. With a one minute rule, you are forced to hold the trade longer than planned, which can turn a small loss into a bigger one.
The one minute rule is not meant to punish traders. It exists to stop latency trading, tick scalping, and platform abuse. But the reality is simple. If you are a scalper, most prop firms with a one minute rule are not built for you.
Scalpers should always check holding time rules before joining a prop firm. If your strategy depends on fast exits, avoiding firms with a one minute rule will save you time, money, and frustration.