A client account that uses credit from the investment dealer to buy a security. A client needs to deposit a margin amount with the balance advanced by the investment dealer against collateral such as investments. The investment dealer can make a margin call, which means the client must deposit more money or securities if the value of the account falls below a certain level. If the client does not meet the margin call, the dealer can sell the securities in the margin account at a possible loss to cover the balance owed. The investment dealer also charges the client interest on the money borrowed to buy the securities.