Average debtor days across Australian SMEs sit between 45 and 65 days. More than half of all invoices issued by Australian SMEs are paid late, and the average business loses around $2,400 per month, or roughly $28,000 per year, to late-paying customers. The gap between the businesses that get paid on time and the ones that do not is rarely the customer mix. It is the system.
Published: April 2026
Most owners underestimate the working capital cost of late payments because they think of it as an admin annoyance rather than a financing decision. It is a financing decision.
A business doing $3M in revenue with average debtor days of 50 has roughly $411,000 permanently tied up in customer receivables. At the RBA cash rate of 4.10% and a typical small business overdraft rate of 9-12%, that is between $37,000 and $49,000 a year in interest cost the business is absorbing on behalf of its customers. If debtor days drop to 35, working capital tied up falls to $288,000, releasing $123,000 in cash and saving roughly $11,000 to $15,000 a year in financing cost.
Reducing debtor days by 15 days is rarely a marginal improvement. For most SMEs it is the single largest source of cash improvement available to them, and it is fully within their control.
For a sense of how working capital tied up in receivables compares to other levers, our client concentration risk calculator and cash flow forecast calculator put the numbers in context.
Most debtor management is reactive, inconsistent, and emotional. The owner notices a customer is overdue, gets frustrated, sends an aggressive email, gets paid that one invoice, and forgets the system again until the next time it bothers them.
Customers learn quickly which suppliers chase consistently and which do not. The ones that do not chase consistently get paid last. Always. Even by customers who have plenty of cash.
Effective debtor management is a system, not a temperament. It runs whether or not the owner is paying attention. It treats every customer the same way, removing emotion and personal relationships from the chasing process. And it starts much earlier in the cycle than most businesses think.
The terms you accept when you onboard a customer determine 80% of how long that customer takes to pay you for the next several years. Tightening terms upfront is significantly easier than tightening them once the relationship is established.
The conversation: "Our standard terms are 14 days for new customers and we move to 30 days after the first three invoices are paid on time. We use Stripe direct debit by default for invoices under $5,000. Does that work?"
Most B2B customers accept this without resistance. The ones who push hardest on terms upfront are usually the ones who will pay slowest. That is signal, not noise.
Include a clear payment terms clause in every engagement letter or contract. Specify the term, the late payment interest rate (most businesses use the RBA cash rate plus 5-7% as a defensible rate), and the right to suspend service for non-payment.
Most business reminder cadences are wrong. They start when the invoice is overdue. By that point the customer has already mentally categorised the invoice as not urgent.
The cadence that works:
7 days before due date: a friendly reminder with the invoice attached and a payment link. Framed as a heads-up, not a chase.
On the due date: a confirmation that payment is due today, with a copy of the invoice and instructions.
3 days after due date: a polite follow-up confirming the invoice was not received and offering to resolve any issues.
7 days after due date: a more direct reminder, copied to the customer's accounts payable team if known.
Xero handles this natively through invoice reminders, but most businesses have not configured them properly. Setting them up correctly takes 30 minutes and reduces debtor days for most SMEs by 5-10 days.
The single biggest behavioural shift you can make is removing the customer's decision to pay each month. Direct debit, recurring card payments, or invoicing platforms with stored payment details collect on the due date automatically.
Stripe, GoCardless, and Pinch all integrate with Xero and handle direct debit collection in Australia. For most B2B services, setting this up as the default for new customers (with the option to opt out, not opt in) typically gets 70-80% of customers onto auto-pay within six months. Customers who refuse auto-pay are often the customers who pay late.
For invoices above a threshold (most businesses use $2,000-$5,000), the personal call on the first day overdue is the single highest-yield tactic in debtor management. It works for two reasons. First, it interrupts the customer's mental sorting of "urgent" versus "not urgent". Second, it surfaces disputes, missing paperwork, or PO issues immediately, before they fester.
The script is short and warm. "Hi, I just noticed the invoice from last month is showing as overdue on our side, want to make sure you received it and it is in your system correctly. Anything we can do to help get it processed?"
Most calls take less than three minutes. The vast majority of overdue invoices over $2,000 get paid within 7 days of this call.
A stop-work clause that exists in the contract but is never enforced is worse than no clause at all. Customers learn quickly which clauses are real.
The clause itself is straightforward: "We reserve the right to suspend services or withhold deliverables where invoices are more than X days overdue." The number you choose (typically 14 or 30 days) signals how serious you are about getting paid.
Enforcing it once, on the right customer, changes the behaviour of every other customer who hears about it. It does not need to be aggressive. A simple email saying "We have paused work pending settlement of invoice #1234, happy to resume as soon as it is processed" is enough.
For your top 10-15 debtors, send a weekly statement of account showing all outstanding invoices, due dates, and total balance. Not a chase, not a demand. Just a statement.
This works because most accounts payable teams in larger customers process payments based on what is on their desk that week. A statement that lands every Monday morning keeps your invoices top of pile. It is also a soft form of escalation, signalling that you are tracking the relationship closely without ever needing to make a difficult phone call.
When an invoice is 30 days overdue, the next escalation is owner-to-owner, not finance-to-finance. The conversation is direct: "I want to flag this with you personally because it is unusual for our payments to run this far behind with you. Is there a relationship issue I should know about, or is it a process problem on the AP side?"
This call gets paid faster than any letter. The reason is simple: most CEOs and founders do not want their company's reputation associated with paying suppliers late. Bringing the issue to their level usually triggers an immediate intervention with their AP team.
Lawyer-style demand letters sent at day 30 or 45 do more damage than good. They escalate the relationship far beyond the underlying issue, signal that you have run out of patience long before most customers expect, and rarely accelerate payment by more than a few days. They also damage future revenue from the same customer in a way that is hard to recover.
Save demand letters for genuinely contested debts, not late ones.
Debt collection agencies typically charge 20-30% of recovered amounts and almost always end the customer relationship. The maths is straightforward: if a $10,000 invoice goes to collections, you receive $7,000-$8,000 and lose any future revenue from that customer.
For a customer who has paid you $50,000 in the past two years and is genuinely struggling cash-wise, sending a $10,000 invoice to collections destroys far more value than it recovers. Reserve collections for customers who have stopped engaging entirely or who have shown bad faith.
Empty threats teach customers exactly how seriously to take you. If you mention legal action and do not follow through, every future customer learns from that experience. The signal is far worse than never mentioning it.
If you would not actually go to court over a debt at the size in question, do not mention legal action at all.
Xero invoice reminders. Built in, free, and most businesses have them set up wrong. The default settings often fire too late and are too generic. Reconfigure them to match the cadence above.
Chaser, Ignition, and Stripe. Each integrates with Xero and handles automated reminders, payment collection, and direct debit. Pricing ranges from $40-$200/month depending on volume. Most SMEs recover the cost within the first month through reduced debtor days.
Internal AR tracker. A simple weekly report showing aged debtors, debtor days, and changes from the previous week. Builds the discipline of treating AR as a number to manage, not a problem to firefight.
For a deeper look at the systems, our outsourced finance team pricing guide covers what AR management looks like inside an embedded finance function.
The maths on firing a chronically late customer is almost always favourable to the business, and almost always done too late.
Calculate the cost of carrying the customer: average days overdue, multiplied by their average monthly revenue, multiplied by your cost of capital. For a $20k/month customer who pays 60 days overdue at a 10% cost of capital, the carry cost is around $4,000 a year. If the customer is also low margin, demanding, or causes admin overhead, the all-in cost is often 10-15% of the revenue they generate.
The conversation when firing them: "We have made a decision to focus on customers where we can deliver consistently. The current payment patterns make that hard to do. We would like to wind down the relationship over the next 60 days, with all outstanding invoices settled."
Most businesses are surprised that the customer often pays the outstanding invoice immediately when faced with the loss of the relationship.
Government contracts. Federal and state government contracts have specific payment terms (often legislated at 20 days for contracts under $1M). If a government department is paying late, the right escalation is the agency CFO and, if that fails, the relevant minister's office. This is not a debt collection issue.
Large corporate buyers. Large corporates often dictate terms (60-90 days is common). If you cannot push back on terms, factor the cost into your pricing or use invoice finance to bridge the gap. Invoice finance typically costs 1-3% per month of the invoice value, which is often cheaper than the alternative of declining the customer.
Mates rates customers. The hardest debtors are personal connections. The system has to apply equally regardless of relationship. The owners who survive long term are the ones who treat AR consistently, even with friends.
What is a reasonable late payment interest rate to charge in Australia?
There is no statutory rate. Most businesses use a defensible rate of the RBA cash rate plus 5-7% (currently around 9.10-11.10%), which is comparable to a typical small business overdraft rate. The rate must be specified in the contract or invoice for it to be enforceable, and the customer must have agreed to it. The Australian Small Business and Family Enterprise Ombudsman provides general guidance on payment terms at asbfeo.gov.au.
Can I claim a tax deduction for bad debts in Australia?
Yes, where you have used the accruals method (so the income was originally recognised), the debt is genuinely irrecoverable, and you have written it off in your accounts before the end of the income year. You may also be able to claim back the GST you paid on the original invoice. This is general information only. Speak to your tax agent for specific advice.
When is the right time to send an invoice to a debt collector?
Generally only after a 60-90 day genuine attempt to resolve, where the customer has stopped engaging or has shown bad faith. Before that point the relationship cost outweighs the recovery cost. Mercantile agents typically charge 20-30% of recovered amounts and rarely produce more than 50-70% recovery on debts already 90+ days old.
Should I offer early payment discounts?
Sometimes. The maths is: discount offered must be less than your cost of capital plus the late payment risk. A 2% discount for payment within 7 days is roughly equivalent to a 36% annualised return on cash, which is high but can be justified in a tight cash position. A 5% discount usually is not, even in a cash crisis.
How do I know if my debtor days are too high?
Below 45 days is healthy for most B2B businesses on 30-day terms. 45-50 days is acceptable. 50-65 days indicates a system issue. Above 65 days requires immediate action. Compare against your own contractual terms: debtor days should not exceed your contracted terms by more than 10-15 days.
Can I refuse to do further work for a customer who has not paid?
Generally yes, where your contract or terms of trade allow it. The clause should be specific (e.g. "services may be suspended where invoices are more than 14 days overdue"). Without a clause, refusing to do work for an overdue customer can expose you to a breach of contract claim if the underlying engagement has not been properly terminated.
Is invoice finance worth it for late-paying customers?
For specific situations, yes. Invoice finance typically advances 80-90% of an invoice value within 24-48 hours, at a cost of 1-3% per month. For B2B businesses with creditworthy customers on 60-90 day terms, this is often cheaper than carrying the receivable through an overdraft. For B2C or small ticket items, it usually is not.
What is the difference between a registered BAS agent and a debt collection licence?
Registered BAS agents (like Scale Suite) handle BAS lodgement, GST advice, payroll compliance, and AR/AP management as part of bookkeeping services. Debt collection (the formal pursuit of debts on behalf of another business) requires a separate state-based licence. Most embedded finance providers handle the operational AR management (invoicing, reminders, statements, calls) but refer formal collection to specialist mercantile agents where required.
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 (April 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.
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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