Customer refusing to pay an invoice: a practical guide for Australian businesses

If a customer is refusing to pay an invoice, don’t react with threat or silence. The fastest path to recovery is methodical: check what you agreed, gather the records that prove the work or supply occurred, try courteous reminders, then move to a formal letter of demand before deciding whether to use a collector or file a tribunal claim. This article explains each step, why it matters, and the practical trade‑offs for businesses in Australia.

What to check first — the contract and the invoice

Start by looking at the contract, purchase order or written terms that cover the supply. Key things to confirm: the due date, any agreed dispute resolution steps, whether the contract requires payment of undisputed parts, and whether late fees or interest were agreed. Your invoice should match the contract description (dates, itemisation, amounts).

Why this matters: a clear contractual basis makes a demand credible and speeds any tribunal or court process. If terms are unclear, collect contemporaneous evidence — emails, delivery dockets, photographs, acceptance certificates, or text messages — that show the goods or services were provided and accepted.

For guidance on reviewing payment terms and the early steps to take, see the federal government’s practical checklist at What to do when you haven't been paid | business.gov.au.

Attempt polite reminders, then prepare a letter of demand

Many unpaid invoices are simple oversights. Call the accounts payable contact, send a short email reminder with the invoice attached, and record those attempts. If polite reminders fail, the usual next step is a formal letter of demand setting out:

• the amount due and invoice number;
• the legal or contractual basis for the claim;
• what supporting documents you hold (contract, delivery evidence);
• a clear short deadline for payment or response; and
• the consequences of continued non‑payment (debt collection, tribunal claim).

A well‑written demand letter does two things: it gives the debtor a last chance to pay without escalation, and it creates a dated record you can rely on if you later file a claim. Official guidance recommends a letter of demand before more aggressive steps; see What to do when you haven't been paid | business.gov.au.

When you send the demand, keep proof of delivery (email read receipts, recorded post, or a courier receipt) so you can show the debtor received the notice.

If the debtor disputes the invoice: collect evidence and focus the disagreement

A refusal to pay can be a substantive dispute rather than bad faith. If the customer says the work is defective, incomplete, or overcharged, treat it as a dispute: gather contracts, scope documents, photos, time sheets, inspection reports and any acceptance emails.

Where only part of an invoice is disputed, many commercial contracts require paying the undisputed portion while referring the disputed part to a dispute resolution clause. For an example of this approach in procurement, see the NSW procurement deed clause that requires payment of undisputed amounts and notification of disputed sums: NSW LSP Deed (procurement example).

If the dispute is consumer-facing (a private consumer refusing payment for a good or domestic service), your local fair trading agency may assist with mediation — for NSW, see Lodge a general consumer complaint | Service NSW. Note that state fair trading bodies often have limited jurisdiction for business‑to‑business disputes.

Escalation options: debt collectors, tribunals and courts — pros and cons

If a letter of demand doesn’t work, you can consider a commercial debt collector, a tribunal claim (small claims track), or court proceedings. Each option has trade‑offs:

• Debt collection services can recover straightforward debts without court, but they cost money and may damage the commercial relationship. See the federal overview at Debt collection services | business.gov.au.
• Small claims or tribunals are usually cheaper and quicker for modest sums; however, monetary limits and procedures vary by state or territory and you should check the local tribunal’s thresholds before filing. The federal guidance suggests attempting resolution first and points to state resources for filing claims: What to do when you haven't been paid | business.gov.au.
• Court proceedings can recover larger debts but are slower and carry higher upfront costs.

Before escalating, check for signs the debtor may be insolvent. If the debtor is a company in financial distress, remedies against it may be limited; ASIC’s guidance for creditors explains insolvency risks and why you should seek specialist advice if insolvency is suspected: Insolvency for creditors | ASIC.

Practical risks and cost considerations

Chasing small debts can cost more than you recover. Balance the likely recovery against collection costs, legal fees and the time involved. Keep a tight record of costs and communications — these help if you later seek to recover collection costs in a tribunal or court.

Also be careful about conduct when chasing payment: debt collection is regulated and you must avoid behaviour that could breach consumer protection or harassment rules. The federal business guidance warns creditors to follow the proper channels and conduct.

If you receive any court documents or a creditor claim, don’t ignore them. Making a complaint to a regulator or tribunal does not prevent the other party from suing you; Legal Aid’s guidance notes that you should still respond to legal proceedings promptly: Making a claim for an unpaid debt | Legal Aid NSW.

A realistic example

Imagine you supplied $6,500 of bespoke signage. The contract set 30‑day terms and the client accepted delivery in writing. Thirty days pass with no payment. You call twice and email once — no response. You send a letter of demand giving seven days to pay and attach delivery acceptance. The client replies disputing a $500 line item as damaged. You offer to deduct the $500 pending inspection and request payment of $6,000. If the client still refuses, you weigh the cost of a $6,000 small‑claims filing in your state versus using a collector. If the client is a company showing insolvency signs, you contact ASIC guidance and consider legal advice before spending on litigation.

When to get professional help

Seek legal advice when the amount is significant, the other party raises complex legal defences, or you suspect insolvency. For standard demand letters prepared from your supplied facts, a professional service can save time; see for a commercial option that prepares documents from customer-provided information. Remember, using such services does not replace legal advice for complex or high‑value disputes.

Final decision checklist

• Have you checked the contract and invoice details?
• Do you hold evidence of delivery/acceptance?
• Have you attempted polite reminders and documented them?
• Did you send a clear letter of demand with proof of delivery?
• Have you considered whether the debtor is insolvent or whether only part of the invoice is disputed?
• Have you weighed collection costs against likely recovery and checked tribunal limits for your state?

If you can answer these and still have unpaid amounts, a targeted escalation — collector, tribunal claim or legal action — is a reasonable next step.

For help preparing a professional demand letter, BeforeSuit can help you prepare your next steps.