Waiting on unpaid invoices while bills land? Days sales outstanding (DSO) shows how long, on average, you wait to collect cash after a credit sale. Divide receivables by credit sales, then multiply by the days in the period.
This explainer sits within the wider topic of business cash flow.
| Item | Value |
|---|---|
| AFP formula | (Average accounts receivable ÷ net revenue) × 365 days |
| Common target | Under 45 days |
| AFP worked example (net 30 terms) | 60.8 days, about 61 days |
| Finance & Real Estate average, 2024 survey | 11 days |
| Distribution & Transportation average, 2024 survey | 41 days |
The figures come from the Association for Financial Professionals glossary entry on DSO. Figures can change, so check the source before you rely on them.
What days sales outstanding measures
According to the Association for Financial Professionals (AFP), days sales outstanding is the time between a credit sale and the moment the cash from that sale is collected. It is one part of the cash conversion cycle, and the longer the DSO, the longer cash is tied up in receivables. AFP’s glossary gives the definition.
A separate explainer on what is accounts receivable covers the balance that this metric is built on.
The cash conversion cycle also includes days payable outstanding (DPO). Commerce Bank’s June 2026 article calls DSO and DPO two sides of the same cash flow coin: DSO tracks how fast customers pay you, and DPO tracks how long you take to pay your own invoices.
TechTarget says the metric is also known as days receivables, average collection period or days’ sales in receivables. Wikipedia adds a caution: the ratio is better read as the days worth of average sales you currently have outstanding than as an exact collection time.
How to calculate days sales outstanding
AFP gives the formula as Days Sales Outstanding = (Average Accounts Receivable ÷ Net Revenue) × 365 days. The steps are:
- Add the beginning and ending receivables balances and divide by two to get the average.
- Take net revenue for the same period: total sales minus any returns or discounts.
- Divide average receivables by net revenue.
- Multiply the result by 365 to convert the ratio into days.
Other sources use a simpler version. Commerce Bank writes it as accounts receivable ÷ net credit sales × number of days, with 365 for a year, 90 for a quarter or 30 for a month.
Worked example from AFP
AFP uses BrightTech Solutions, a software seller whose clients pay on credit with terms of net 30. In the first quarter it had these figures:
- Beginning accounts receivable: $950,000
- Ending accounts receivable: $1,050,000
- Net revenue for the quarter: $6,000,000
The average receivable is $1,000,000, so DSO = ($1,000,000 ÷ $6,000,000) × 365, which is 60.8 days, or about 61 days. AFP notes that is twice as long as the company’s 30-day terms, which may indicate collection problems or late-paying customers.
Corpay’s October 2026 update says mixing period lengths across the numerator and denominator is where most spreadsheet errors originate. Whichever version you use, keep the period consistent.
What is a good days sales outstanding?
AFP says most companies aim for a DSO under 45 days. TechTarget describes the same benchmark as favorable for most industries. Norms vary by industry, provider and country, and AFP says a DSO of 85 days might be normal for a high-end industrial manufacturer but a red flag for a clothing retailer.
In 2024, a survey by Zone & Co., as reported by AFP, found these average DSOs by industry:
- Distribution & Transportation: 41 days
- Energy & Utilities: 19 days
- Finance & Real Estate: 11 days
- Healthcare, Nonprofit & Government: 22 days
- Manufacturing & Construction: 21 days
- Retail, Food & Entertainment: 26 days
- Technology & Professional Services: 34 days
Commerce Bank offers a rule of thumb tied to your own terms: DSO should sit within five to 10 days of your standard payment terms. On net 30 terms, it says a DSO under 40 days is good and under 35 days is excellent (Commerce Bank, June 2026).
Corpay, citing APQC benchmarking data, says top-quartile organizations collect in 30 days or less while bottom-quartile performers take 46 days or longer (Corpay).
What a rising DSO can signal, and where the metric falls short
AFP says a rising DSO may be a warning sign. Possible causes it lists are:
- customers may be unhappy;
- sales teams may be offering extended payment terms to close deals;
- the company may be taking on customers with poor credit ratings.
Commerce Bank adds that a consistently bad DSO may cause businesses to seek outside financing, take on extra debt and struggle to pay operational costs. Terms and costs of any such financing vary by provider and country.
The metric has limits, which the sources describe as follows:
- Credit sales only. AFP says cash sales are not included, so a business with many cash sales will show a lower DSO.
- Seasonality. AFP says seasonal or cyclical businesses often see DSO swings tied to the timing of sales.
- Averages hide the tail. Corpay says a DSO of 40 built from customers who all pay at 40 describes a different business from a DSO of 40 built from most customers paying at 25 and one large account paying at 120.
- Sales changes move it too. Wikipedia says that if sales decrease in isolation, DSO will increase.
How businesses lower DSO
AFP lists several practices that can help lower DSO:
- setting and monitoring credit limits for customers;
- automating invoicing to cut mistakes;
- sending invoices consistently, at the same time and in the same format.
Commerce Bank says streamlining receivables through digitization, automation and better data visibility can accelerate payments and improve forecasting. A DSO you track each period can feed a cash flow forecast, because slower collections change when cash is expected to arrive.
Whichever route a business takes, TechTarget suggests tracking DSO month by month on a trend line. Seasonal businesses can compare the same month year over year.
Frequently asked questions
Is a lower DSO always better?
Show answer
In general, yes: AFP says the lower the DSO, the better. It notes exceptions for seasonal or cyclical businesses, and Wikipedia says a very low ratio may indicate a credit policy that is too rigorous and hampers sales.
Is DSO the same as the average days to collect a sale?
Show answer
Not exactly. AFP reads the result as how long it takes, on average, to get paid, while Wikipedia says that reading is common but the ratio is better understood as the days worth of average sales currently outstanding.
How many days should I use in the formula?
Show answer
Commerce Bank lists 365 for an annual calculation, 90 for quarterly and 30 for monthly. Use the day count that matches the period of your receivables and sales figures.
Do cash sales count toward DSO?
Show answer
No. AFP and TechTarget both say DSO only measures credit sales, so cash transactions are excluded from the calculation.
This page is for general information and education only and is not financial, investment, tax or legal advice.
