What is days sales outstanding?

Days sales outstanding (DSO) is the average number of days it takes a company to collect payment after a sale, calculated as accounts receivable divided by credit sales, multiplied by the number of days in the period. A lower DSO means faster cash conversion; a rising DSO signals collections are slowing relative to sales.

By Zuny Fester, Head of Operations and Marketing

Reviewed by Zuny Fester

Published September 10, 2026Last reviewed September 10, 2026Editorial policy

Part of the accounts receivable and collections guide.

Formula	(Accounts receivable / Credit sales) × Number of days
What a lower DSO means	Faster conversion of credit sales into cash
What drives comparison	A company's own trend over time, more than industry averages
Typical range	Varies widely by business model — see the by-model benchmark on the hub page

What DSO actually measures

DSO answers a specific question: on average, how many days pass between a credit sale and the cash from it actually arriving? It's a proxy for how efficiently a company converts sales into usable cash, and by extension, for how well its credit policy and collections process are working together.

Why the trend matters more than the absolute number

Comparing DSO to a generic industry benchmark is less useful than tracking it against a company's own history, since payment terms, customer mix, and business model all shift what a "normal" DSO looks like. A DSO that's climbing steadily, at otherwise stable payment terms and customer mix, is the signal worth acting on — regardless of whether the absolute number looks high or low compared to another company.

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Worked example

Calculating DSO for a quarter

A company has $600,000 in accounts receivable at quarter end and recorded $3,600,000 in credit sales over the 90-day quarter. DSO = ($600,000 / $3,600,000) × 90 = 15 days. If the prior quarter's DSO was 12 days on similar sales and payment terms, that three-day increase is worth investigating even though 15 days is, in isolation, a low number for most business models.

Frequently Asked Questions

No — the formula specifically uses credit sales, since cash sales don't generate a receivable to begin with.

It depends heavily on payment terms and business model — a DSO meaningfully higher than a company's stated payment terms (net 30 producing a DSO of 60, for example) is a clearer red flag than any fixed universal number.

They're generally the same concept described with different names — both measure the average time to collect on credit sales using a similar formula.

Sources

Topic

AR & Collections

Accounts receivable is the money customers owe a business for goods or services already delivered on credit — a current asset on the balance sheet until it's collected. AR and collections, as a practi…

How-to

How do I calculate days sales outstanding?

Divide ending accounts receivable by total credit sales for the period, then multiply by the number of days in that period. Use credit sales only, not total revenue, and be consistent about the period length (30, 90, or 365 days) so DSO trends over time are actually comparable to each other.

How-to

How do I reduce days sales outstanding?

Send accurate invoices promptly, offer multiple payment methods, automate payment reminders, follow up systematically on overdue accounts, and review outstanding receivables regularly. Most DSO reduction comes from removing friction and delay in the invoice-to-cash cycle, not from pressuring customers harder.