Glossary
Days Sales Outstanding (DSO)
Days sales outstanding, or DSO, is a measure of the average number of days a company takes to collect payment after making a sale on credit terms.
Days sales outstanding is one of the most widely used measures of how quickly a business turns its invoices into cash. The basic formula divides accounts receivable at the end of a period by total credit sales for that period, then multiplies by the number of days in the period. A lower DSO generally means customers are paying faster, while a rising DSO suggests that collections are slowing or that credit terms have loosened.
In B2B collections, DSO is a summary number that sits on top of the accounts receivable aging report. It does not tell you which customer is late, but it shows whether the overall trend is moving in the right direction. Credit teams often compare DSO against their standard terms. If most customers are on net 30 terms and DSO is well above 30, a meaningful share of the receivable book is being paid late or not at all.
Here is a simple example. A fictional packaging manufacturer, Crestline Boxworks, ends the quarter with $450,000 in receivables. Its credit sales for the 90-day quarter were $1,350,000. Dividing $450,000 by $1,350,000 gives 0.333, and multiplying by 90 days gives a DSO of about 30 days. If the next quarter shows the same sales but $600,000 in receivables, DSO climbs to 40 days, a signal to look closer at the aging detail.
DSO matters to a creditor because cash tied up in receivables is cash the business cannot use for payroll, inventory, or growth. The number can be skewed by seasonal sales swings or a few large invoices, so it works best as a trend measured the same way each period. When DSO rises, the next step is to find the specific accounts behind the change and decide whether they need closer follow-up or outside collection help.
Example
Crestline Boxworks has $450,000 in receivables and $1,350,000 in quarterly credit sales. ($450,000 / $1,350,000) x 90 days gives a DSO of about 30 days.