Abstract: This invention relates to an anti-theft cash register of the type for use at the point of sale for calculating and collecting the total charges for the sale. The cash register includes a vault for storing money therein and a deposit system for receiving and inserting the money into the vault. The deposit system also generates a money deposit signal responsive to the money being deposited in the vault. An electronic computer is provided for processing data input signals to calculate a sales total, for comparing the money deposit signal with the total, and for generating change signals responsive thereto. A withdrawal system is also included for removing and disbursing the money from within the vault responsive to receiving the change signals from the computer. An alarm system is provided for generating warning signals in response to an unauthorized entry into the vault.