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Days sales outstanding DSO
Also called average collection period, receivable days.
The average number of days a business waits to get paid after invoicing, calculated from the receivables balance against credit sales for the period.
Drafted with AI assistance. Not yet independently checked. Nobody has verified the claims on this page against a source, so treat the figures and legal points as a starting point rather than as settled, and confirm anything you are about to act on. How we check things.
What it means
Divide accounts receivable by credit sales for a period, then multiply by the number of days in that period. The result estimates how long a dollar of billing sits before it converts to cash.
It is the central number in receivables finance. A factor prices per period, so DSO determines how many periods each invoice will be charged for. An asset-based lender uses it to set eligibility cutoffs and to judge whether the borrowing base is aging out. A working capital lender reads it as the size of the hole it is being asked to fill.
How to compute it honestly
- Use credit sales, not total sales. Including cash and card revenue understates the number and hides the problem.
- Match the period to the sales figure. A quarterly receivables balance against annual sales produces nonsense.
- Look at the aging alongside it. DSO is an average, and averages conceal the tail.
Where this one catches people
Two ledgers with identical DSO can behave completely differently. An average of 45 days made up of customers who all pay at 45 is a financeable ledger; an average of 45 built from most customers at 20 and one large account at 120 is a concentration problem wearing a respectable number. Factors and ABL lenders read the aging, not the average, and they price the tail.
Worked through
Receivables of $200,000 against credit sales of $600,000 over a 91-day quarter: 200,000 / 600,000 x 91 = 30.3 days. If the factoring fee is quoted per 30 days, most of that ledger costs one period, and anything slipping past day 30 costs two.
Figures in the example are illustrative. They show the arithmetic, not a quote — what any one lender would charge is on that lender's page, where it is published at all.
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Days sales outstanding — common questions
What does days sales outstanding mean?
The average number of days a business waits to get paid after invoicing, calculated from the receivables balance against credit sales for the period.
Where does days sales outstanding catch people out?
Two ledgers with identical DSO can behave completely differently. An average of 45 days made up of customers who all pay at 45 is a financeable ledger; an average of 45 built from most customers at 20 and one large account at 120 is a concentration problem wearing a respectable number. Factors and ABL lenders read the aging, not the average, and they price the tail.
Is days sales outstanding the same as an interest rate?
Days sales outstanding is defined above; if you are comparing it against a rate, check whether the two measures share a time dimension before you put them side by side.
Which products does days sales outstanding apply to?
Working Capital, Invoice Financing, Asset-Based Lending.
Is there a worked example of days sales outstanding?
Yes, on this page, and it is labelled illustrative. It shows the arithmetic, not a quote from any lender.
What else should I read alongside days sales outstanding?
Aging report, Borrowing base, Concentration, Dilution, Eligible receivable.
Has this definition been checked?
Not yet. This entry is drafted and live, and the notice at the top says so. Confirm anything you are about to act on.
Is this legal advice?
No. It is a definition. What a clause does in your contract, in your state, is a question for a lawyer licensed where you are.
Can I suggest a term?
Yes — [email protected]. The glossary grows from what people are actually shown in contracts.