Understanding Debtor Days: A Guide for Australian Small Business
2026-01-28 · 6 min read · PaidMate Team
If you're running a business in Australia, "debtor days" is one of the most important numbers you're probably not tracking. This metric tells you, on average, how long it takes for your customers to pay their invoices — and it has a direct impact on your cash flow.
What Are Debtor Days?
Debtor days (also called Days Sales Outstanding or DSO) measures the average number of days between issuing an invoice and receiving payment. It's a snapshot of how efficiently you're converting sales into cash.
How to Calculate Debtor Days
The formula is straightforward:
Debtor Days = (Accounts Receivable / Total Credit Sales) × Number of Days
For example, if you have $50,000 in receivables and did $200,000 in credit sales over 90 days:
($50,000 / $200,000) × 90 = 22.5 debtor days
This means, on average, it takes 22.5 days from invoicing to payment.
What's a Good Debtor Days Number?
It depends on your industry and payment terms, but generally:
- Under 30 days: Excellent — your collections process is working well
- 30-45 days: Acceptable for most industries with 30-day terms
- 45-60 days: Needs attention — you're essentially financing your clients
- 60+ days: Serious problem — immediate action required
The Australian average for SMEs is around 35-40 days, but best-in-class businesses often achieve under 25 days.
Why Debtor Days Matter
Cash Flow Impact
Every day your money sits in receivables is a day you can't use it for operations, investments, or emergencies. High debtor days often lead to overdraft reliance.
Cost of Capital
If you're borrowing to cover cash flow gaps caused by slow-paying clients, you're paying interest for the privilege of waiting for money you've already earned.
Business Valuation
If you ever sell your business, buyers and valuers look at debtor days as an indicator of business health. Lower is better.
How to Reduce Debtor Days
- Invoice immediately: Don't wait — send invoices when work is complete
- Shorten payment terms: Consider 7 or 14 days instead of 30
- Follow up promptly: Remind clients on Day 1 past due, not Day 30
- Make payment easy: Online payments, multiple methods, clear instructions
- Automate reminders: Consistent follow-up catches issues early
- Offer early payment discounts: 2% off for payment within 7 days
Track and Reduce Debtor Days Automatically
PaidMate integrates with Xero to give you real-time visibility into your debtor days. Our AI-powered reminders help you collect faster and improve cash flow.