The One-Percent rule defines the maximum amount of risk that is allowed on a per trade basis. This is also known as risk-per-trade and it is one risk management technique used to protect an account from an excessive loss. As you can probably guess already the One-Percent rule stipulates that no more than 1% of total capital can be risked on any single trade. So, a trader with a $10,000 account balance would not risk more than $100 on a single trade.