What days sales outstanding tells you
Accounts receivable are the amounts customers still owe for sales already made. Net credit sales are the sales for which the business let customers pay later. DSO turns the relationship between the two into a number of days, which you can set directly against the payment terms you offer. It expresses receivables turnover in days rather than as a number of times.
A result of 45 days means customers paid, on average, about 45 days after the sale. If your standard terms are 30 days, that gap suggests a share of customers are paying late. If your terms are 60 days, the same result suggests most customers pay before the due date.
Reading a high or low result
- A higher DSO means cash stays tied up in receivables for longer. It can point to slow collection, disputed invoices or customers in financial difficulty. It can also reflect longer terms offered on purpose to win sales.
- A lower DSO means customers pay sooner, which frees cash. It may reflect short terms, discounts for early payment, or receivables sold to a finance company.
Normal levels depend on the payment terms customary in each market. Track DSO against your own terms and against earlier periods.
Credit sales, total revenue and days in the period
Use credit sales where you can. Cash sales never create a receivable, so including them in the sales figure makes DSO look shorter than the time credit customers actually take. Companies rarely report credit sales separately, so outside analysts often use total revenue instead. That is a reasonable substitute when nearly all sales are on credit, but not when a large share is paid in cash.
The calculator uses a 365-day year by default. Some textbooks use 360 days, which gives a slightly lower result. Use whichever matches the figures you are comparing with, and match the days to the period your sales figure covers.
What DSO does not show
- It is an average. A few very late accounts can hide behind many prompt payers. A list of unpaid invoices grouped by age shows where the problem sits.
- It is sensitive to timing. A burst of sales just before the period end raises receivables and DSO even if every customer pays on time.
- Receivables written off as uncollectible leave the balance, which lowers DSO even though the cash never arrived.
Average vs ending balances
Sales build up across the period, while receivables are measured on a single date. Averaging the opening and closing balances gives a figure closer to what customers typically owed during the period. To use the average, open “Add opening balances to use averages” and enter receivables at the start of the period. If you leave it blank, the calculator uses ending receivables, which can give a quite different answer when the balance grew or shrank. Use the same approach each period.
Common mistakes
- Using total revenue in a business where many sales are paid in cash, which makes collection look faster than it is.
- Pairing a quarter’s sales with 365 days. The days should match the period the sales figure covers.
- Including other receivables that did not arise from sales, such as tax refunds due or loans to employees.
- Comparing DSO with a business that offers very different payment terms.
Related measures
Days payable outstanding measures the other side of trade credit: how long the business takes to pay its own suppliers. The cash conversion cycle adds DSO to the days inventory is held and subtracts the days taken to pay suppliers. The current ratio counts receivables as current assets, so slow collection can make it look stronger than the cash position behind it.