Days Sales Outstanding (DSO)

What is Days Sales Outstanding (DSO)?

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Days Sales Outstanding (DSO) is a measure of how long, on average, it takes a company to collect payment after a sale has been made. It is calculated as the number of days between issuing an invoice and receiving cash against it.

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DSO is one of the most widely tracked metrics in Order-to-Cash finance. A high DSO means cash is sitting in unpaid invoices for longer — which strains working capital. A low DSO means the business collects quickly and cash is available sooner.

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The DSO formula

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DSO = (Accounts Receivable / Total Credit Sales) × Number of Days

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For example: if a business has $5 million in outstanding receivables at month-end and generated $20 million in credit sales over the past 90 days, DSO = (5,000,000 / 20,000,000) × 90 = 22.5 days.

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What a good DSO looks like

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DSO benchmarks vary significantly by industry, payment terms, and customer mix. A business offering net-30 terms should aim for a DSO below 35 days — anything significantly above payment terms suggests collection problems. Professional services, construction, and government-facing businesses typically run higher DSOs than retail or subscription businesses.

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The most useful benchmark is not an industry average but your own payment terms. If you offer 30-day terms and your DSO is 55, you have a collections problem worth addressing.

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What drives high DSO

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Invoicing delays. Invoices sent late give customers permission to pay late.

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Dispute management. Invoices under dispute sit unpaid until resolved. The longer disputes take to resolve, the higher DSO climbs.

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Collections workflow. Without a systematic follow-up process, overdue invoices wait until someone notices.

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Cash application delays. If payments cannot be matched to invoices quickly, AR balances stay open even after cash has been received.

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Customer concentration. A few large customers paying on their own schedule can dominate DSO figures.

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How to reduce DSO

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The most impactful levers are: invoice on time (ideally automatically, at the moment of delivery or service completion), automate payment reminders, resolve disputes faster with a structured workflow, and apply cash to invoices immediately using automated cash application. Each of these reduces the time between invoice and cleared payment.