DSO & Cashflow Score Calculator

What Is DSO (Days Sales Outstanding)?

Days Sales Outstanding (DSO) measures the average number of days it takes your business to collect payment after making a sale. It's one of the most important metrics in accounts receivable management because it directly reflects how efficiently your business converts credit sales into cash.

A high DSO means you're waiting longer to get paid. This ties up working capital, increases your exposure to bad debt, and limits your ability to reinvest in growth. A low DSO means your collections process is efficient and debtors are paying promptly.

The formula is simple: DSO = (Accounts Receivable ÷ Credit Sales) × Number of Days. For example, if you have £100,000 in receivables and £300,000 in quarterly sales, your DSO is 30 days.

What Is a Good DSO in the UK?

There's no single "good" DSO — it depends on your industry, payment terms, and customer base. However, most UK businesses should aim for a DSO that closely matches their standard payment terms.

If your terms are 30 days and your DSO is 50, you're effectively waiting 20 days longer than agreed. Across industries, typical UK benchmarks range from 28 days (retail) to over 50 days (construction). Professional services firms typically see DSO around 30–38 days.

Why High DSO Damages Cashflow

When DSO is high, cash that should be in your bank account is sitting in your debtors' accounts instead. This creates a working capital gap that forces businesses to rely on overdrafts, credit facilities, or delayed supplier payments — all of which carry costs and risks.

High DSO also signals that your collections process may be inconsistent, that debtors are taking advantage of weak follow-up, or that your payment terms are not being enforced. Over time, this compounds into significant financial pressure.

How to Reduce DSO

The most effective way to reduce DSO is to make your collection process faster, more consistent, and more structured. This means sending reminders immediately when invoices become overdue, following up at regular intervals, and escalating firmly when debtors don't respond.

Offering payment plans and settlement options can also reduce DSO by converting slow-paying debtors into partial recoveries rather than leaving invoices aging indefinitely. Automation tools like AutoSettle handle this entire process using AI credit controllers, so your team doesn't need to spend hours chasing manually.