DSO Calculator

What is Days Sales Outstanding and Why Does It Matter?

Days Sales Outstanding (DSO) measures the average number of days it takes your business to collect payment after a credit sale. The formula is: DSO = (Accounts Receivable ÷ Total Credit Revenue) × Number of Days in the period. A lower DSO means cash is coming in faster relative to your sales volume. A high or rising DSO means money is tied up in unpaid invoices — reducing your ability to pay suppliers, meet payroll, or invest in growth without relying on credit.

In Australia, standard commercial payment terms are typically 30 days, though 60-day terms are common in construction, government, and large enterprise supply chains. As a rough benchmark, a DSO close to your standard payment terms (e.g. 30–35 days on Net 30 terms) is healthy. A DSO significantly higher than your stated terms — say 55 days on Net 30 — suggests customers are routinely paying late and your collections process needs attention. Industry matters too: professional services and software businesses tend to have DSOs of 30–45 days, while construction and manufacturing often run 50–70+ days due to longer contract cycles and retentions.

A single DSO figure is less useful than tracking the trend. Calculate it monthly and look for movements. A DSO that increases steadily over a quarter is an early warning sign — it could mean a large customer is in difficulty, your invoicing has slipped, or your team is not following up overdue accounts consistently. Address it early; the longer an invoice ages, the less likely it is to be collected in full.

How to use this calculator

1. Enter your closing accounts receivable balance for the period.
2. Enter your total credit revenue for the same period (exclude cash sales).
3. Enter the number of days in the period (30 for monthly, 90 for quarterly, 365 for annual).
4. Review your DSO and compare it against your standard payment terms to assess collection performance.

What is a healthy DSO for Australian businesses?

Benchmark your DSO against your own terms first — if you offer Net 30 and your DSO is 45+, something is wrong. Across Australian SMBs broadly, a DSO under 45 days is generally considered healthy. Wholesale and distribution businesses often accept 45–60 days as normal. If your DSO exceeds 75 days and your terms are Net 30, you likely have a significant collection problem that is affecting cash flow.

How can I reduce my DSO?

The most effective levers are: invoice promptly (delays in sending invoices directly extend DSO), follow up at or before the due date (not weeks after), offer early payment discounts to incentivise faster payment, and make it easy to pay (direct debit, BPAY, or card). Review your top 10 debtors — a small number of slow payers often drives most of your DSO. Tightening credit terms for habitually late customers is often more effective than chasing individual invoices.

Should I include GST in my accounts receivable when calculating DSO?

Yes — your AR balance on the balance sheet includes the GST component of outstanding invoices (since you have not collected it yet). To keep the calculation consistent, also include GST in your revenue figure, or exclude GST from both. Mixing GST-inclusive AR with ex-GST revenue will produce a DSO figure that is roughly 10% overstated.