What is Days Sales Outstanding (DSO)?

‍

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.

‍

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.

‍

The DSO formula

‍

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

‍

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.

‍

What a good DSO looks like

‍

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.

‍

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.

‍

What drives high DSO

‍

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

‍

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

‍

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

‍

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

‍

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

‍

How to reduce DSO

‍

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.