Credit sales means allowances of goods to customers in order to pay in advance. Abby. The name speaks for itself. It is goods given to a customer on credit, meaning that you sell the goods and collect cash at a later date per agreement with customer. Under a credit sale agreement you buy the goods at the cash price. You usually have to pay interest but some suppliers offer interest free credit. Repayment is made by instalments until you have paid the whole amount.