A Cash account must have enough cash to cover the cost of a position plus commissions and can never hold a negative cash balance. Please note, market orders add an extra 5% to the order amount as a buffer to account for market movements. As a result, market orders may be rejected due to insufficient cash. No such buffer is included when using Limit orders.
Please note, you can test a new order type or trading strategy in your Paper Trading Account first. When logging into your Trading platform, choose Paper Trading as the Mode to access it.