Every day of debtor days costs a $5M-revenue business roughly $13,700 of cash locked in receivables ($5,000,000 ÷ 365). Stretch from 30 to 55 days, which is unremarkable in Australian B2B, and about $342,000 of your own money is permanently parked in other people's bank accounts, funded by your overdraft at business lending rates. This guide sets out where debtor days typically sit by industry, how to calculate yours, and what actually moves the number.
Published: July 2026
Debtor days = (Trade receivables ÷ Revenue) × 365.
Use gross receivables including GST against GST-inclusive revenue, or exclude GST from both; mixing bases is the most common calculation error. A $4M-revenue business carrying $520,000 of receivables sits at 47 debtor days. Do the same for creditors and stock and you have the full cash conversion cycle, which our cash conversion cycle guide and working capital deep-dive walk through.
Payment behaviour in Australia varies more by industry and customer type than by business quality. Indicative ranges observed across Australian SMEs, from standard terms and typical payment lag:
Two cautions. First, these are indicative operating ranges, not statutory data; your accountant can benchmark you precisely against ATO small business benchmarks for your industry code. Second, the trend matters more than the level: a business drifting from 38 to 47 days over two quarters is telling you something its P&L is not (our piece on why cash feels tight when profits look fine explains that disconnect).
Cash locked per debtor day = annual revenue ÷ 365. The funding cost compounds it: if the locked cash sits on an overdraft at, say, 10 per cent, a business at $5M revenue carrying 20 excess debtor days ($274,000) pays roughly $27,400 a year in interest purely to finance customers' lateness. Late payments remain one of the largest identified drags on Australian SME cashflow; our analysis of what late payments cost Australian SMEs and the real cost of 30-day payment terms put numbers on the aggregate.
Ranked by observed impact for SMEs:
A weekly-run receivables process is a bookkeeping function; if yours runs monthly because capacity is short, that cadence gap is usually worth more than any tactic on this list (context: what a bookkeeper actually does each month).
What is a good debtor days number in Australia?
Under 40 for most B2B service businesses on 14-30 day terms, under 7 for consumer-paid businesses, and under 60 for construction and wholesale. Better than "good" is "stable and trending down".
How do I calculate debtor days?
Trade receivables divided by revenue, multiplied by 365, keeping GST treatment consistent between the two figures. Calculate it monthly and chart the trend.
Why are my debtor days high when customers say they pay on time?
Usually invoice timing: invoicing at month end adds a hidden 15 days on average before payment terms begin. Measure from work-completed date to cash, not invoice date to cash, and the gap shows itself.
What are typical payment terms in Australia?
14 to 30 days for most B2B work, with construction commonly on end-of-month-plus-30. Actual payment behaviour typically runs 10-25 days beyond stated terms, which is why benchmarks exceed terms across every industry.
Is it worth charging late payment interest?
As a deterrent stated on terms, sometimes; as a collection mechanism, rarely for SMEs. Deposits, direct debit, and systematic reminders reliably outperform interest clauses.
When should debtor days trigger a bigger review?
When the number rises for two consecutive quarters, when any single customer exceeds roughly 20 per cent of receivables (run the client concentration risk tool), or when the overdraft is funding the gap.
Scale Suite is a Sydney-based provider of outsourced finance teams and fractional CFO services for Australian SMEs. We deliver weekly bookkeeping, payroll, BAS/IAS lodgement, cashflow reporting, management accounts, and strategic fractional CFO oversight, all as a fully embedded team that works inside your business.
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We review and check this guide periodically. At the time of writing (July 2026), all information was current. Scale Suite is a registered BAS Agent, not a licensed tax advisor or financial advisor. This content is general information only and does not constitute professional tax, financial, or legal advice. Some details may change over time. Industry ranges are indicative observations, not statutory statistics; benchmark your own business against ATO small business benchmarks for your industry code.
Sources:
Scale Suite is a Sydney-based provider of outsourced finance and HR services for Australian SMEs. We deliver bookkeeping, financial reporting, payroll processing, fractional CFO support, recruitment, employee onboarding, people and culture support, and fractional HR oversight, all as a fully embedded team that works inside your business.
Employment Hero Gold Partner, CA-qualified, and Xero Certified, we replace fragmented finance and HR processes with one responsive, senior-level function at a fraction of the cost of full-time hires. We serve growing businesses across Sydney, Melbourne, Brisbane, and Perth, with packages starting from $1,500 per month and no lock-in contracts.
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