A measure of the average number of days that a company takes to collect revenue after a sale has been made. A low DSO number means that it takes a company fewer days to collect its accounts receivable. A high DSO number shows that a company is selling its product to customers on credit and taking longer to collect money.

Days sales outstanding is calculated as:



|||Due to the high importance of cash in running a business, it is in a company's best interest to collect outstanding receivables as quickly as possible. By quickly turning sales into cash, a company has the chance to put the cash to use again - ideally, to reinvest and make more sales. The DSO can be used to determine whether a company is trying to disguise weak sales, or is generally being ineffective at bringing money in. For most businesses, DSO is looked at either quarterly or annually.