How Does a Cash Register Work?

A cash register is a device that enables a sales clerk to calculate a sale and give people proper change and a receipt for their purchase. Attached to a cash register is a cash drawer, which opens during a transaction and will allow a cashier to make any change that may be necessary.

Electronic Cash Registers

An electronic cash register operates in a simple and straightforward manner. An employee will scan an item with a bar code scanner, which will enable the register to display the current price of the item. The cashier will then input the payment method and payment amount that the customer has provided, and do the appropriate calculation to determine how much, if any, change is necessary. A receipt is then printed for the customer, and when the transaction is officially complete, the item or items purchased are keyed out of the store's inventory records simultaneously, enabling the store to keep its inventory counts accurate.

A record of every transaction on any particular register is kept by the machine and printed out at the end of every business day, so cash drawers can be counted to ensure the appropriate amount of money is included.

Mechanical Cash Registers

A mechanical cash register operates in much the same way as an electronic cash register, with a few differences. A sales clerk rings up the item as normal, only now he must physically key in the price by hand, as well as the amount of money the customer is paying with. The register then does the calculation and the cash drawer is opened for the giving of change. The register is not, however, connected to a store's inventory. This means that when a sale takes place, at some point a store worker is going to have to physically key the item out of inventory or else the store counts will be incorrect. Mechanical cash registers also do not allow you to do things like check current prices or sales.