Days sales outstanding, or DSO, estimates the average number of days a business takes to collect customer invoices. A rising DSO can warn that cash is becoming trapped in accounts receivable, even when reported sales and profit look healthy.
How to Calculate DSO
Divide accounts receivable by credit sales for the period, then multiply by the number of days in that period. If receivables are $120,000 and quarterly credit sales are $360,000, DSO is about 30 days: $120,000 divided by $360,000, multiplied by 90.
Use Credit Sales, Not All Sales
Cash sales do not create accounts receivable. Including them can make collection performance appear better than it is. If your system cannot separate cash and credit sales, document the limitation and use the same method consistently.
What Is a Good DSO?
There is no universal target. Compare DSO with your payment terms, industry, customer mix, and historical trend. A business offering net-30 terms should investigate why DSO remains near 55 days. A company using milestone billing may naturally show a different pattern.
Why DSO Can Increase
Common causes include slow invoicing, incorrect bills, weak follow-up, customer disputes, longer payment terms, concentration in a slow-paying client, or sales growth that outpaces collection capacity. Seasonality and one large invoice can also move the number temporarily.
Invoice Quickly and Accurately
Send invoices as soon as the delivery or milestone is complete. Confirm the customer's billing contact, purchase-order requirements, portal process, and supporting documents before work begins. An invoice sitting in a rejected portal queue is not truly in the payment process.
Make Payment Easy
Offer practical electronic payment methods and put instructions directly on the invoice. For larger jobs, use deposits, progress billing, or automatic recurring payments when appropriate. Convenience can shorten collection time without changing formal terms.
Follow Up Before an Invoice Is Seriously Late
Send a reminder shortly before the due date and contact the customer promptly after it passes. Use an accounts-receivable aging report to prioritize large and old balances. Record promises to pay, disputes, and follow-up dates so invoices do not disappear between employees.
Tighten Credit Decisions
Set credit limits and payment terms based on customer risk instead of giving every buyer the same arrangement. Review references or credit information for large exposures. Pause new credit when a customer repeatedly breaks payment commitments.
Do Not Improve DSO at Any Cost
A strict policy can damage valuable relationships or reduce sales. The objective is to collect according to agreed terms while resolving legitimate disputes quickly. Track bad debt, discounts, and customer retention alongside DSO.
What Owners Should Take Away
DSO converts receivables into a simple time-based signal. Review it monthly with the aging report and cash forecast. When it rises, identify the customers and process problems behind the change. Faster, more predictable collections reduce borrowing needs and give the business more cash to operate.
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