What to do when a customer won't pay an invoice

Updated 5 August 2026 · By the Badger team

An unpaid invoice is a problem with a playbook. Most "won't pay" situations are actually "haven't paid yet" — disorganisation, a cash-flow squeeze, or a query nobody voiced. The job is to find out which one you have, escalate on a schedule instead of on frustration, and know exactly where the road ends. Here's the whole sequence.

General information only, not legal advice — for large or disputed debts, get advice for your situation.

Step 1: diagnose before you escalate

There are only four reasons an invoice sits unpaid, and each has a different fix:

• Forgot or lost it. The most common by far. Fix: a friendly reminder with the invoice re-attached. Done.
• Can't pay right now. A cash-flow problem, not a character problem. Fix: a payment plan with dates in writing — half now and half in a fortnight beats 100% of nothing.
• Won't pay because something's wrong. A dispute about the work, the amount, or a promise they think you broke. Fix: get the objection stated plainly, resolve what's fair, and re-invoice. Chasing harder while a genuine dispute stands just hardens it.
• Won't pay, full stop. The rare true deadbeat. Fix: the formal track below, run without emotion.

You can't diagnose without contact — which is why silence is the one response you never accept. Every message should make replying easy and every reply should get an answer.

Step 2: run the ladder on a calendar, not a mood

Escalate every one to two weeks: friendly nudge in the first week overdue, firm follow-up around two weeks, a phone call (voice moves invoices email can't), then a formal final notice around 30–45 days. The full wording for each stage is in our reminder templates and escalation guide. Two rules hold throughout: check the invoice is still unpaid before every send, and put every promise — "I'll pay Friday" — in writing with a follow-up booked for Saturday.

Step 3: the letter of demand

When the final notice changes nothing, send a letter of demand: the exact amount, a 14-day deadline, and a stated intention to pursue recovery. It's the cheapest legal-adjacent step there is, and it resolves a large share of stubborn debts on its own — partly because it's the first signal that you keep records and follow through.

Step 4: small claims, agency, or walk away

• Small claims. Each state's small-claims court or tribunal handles typical invoice amounts with modest fees and no lawyer needed. Bring the invoice, your terms, and the chase history. A judgment also unlocks enforcement options a mere invoice never had.
• Collection agency. Worth it for debts big enough to justify the commission, after your own process is spent. Any collector — including you — must follow the ACCC/ASIC debt-collection guideline: reasonable hours, no harassment, no threats you don't mean.
• Write it off. Below a few hundred dollars, your time usually costs more than the debt. Write it off deliberately, claim the deduction where it's available, and change that customer's terms to deposit-first — or decline the next job.

What not to do

Don't threaten action you won't take — it breaches the debt-collection guideline and teaches the debtor your deadlines are theatre. Don't vent in writing; every message may be read aloud in a tribunal. Don't keep supplying someone who owes you for the last three jobs. And don't chase an invoice that's been paid — verify before every single send.

The pattern behind every stuck invoice

Debts that reach the ugly stages almost always aged quietly first — chased "when things were quiet," which was never. The fix isn't firmer letters at day 90; it's relentless courtesy from day 3, every time, with every promise tracked. That's a discipline accounts receivable software runs without you thinking about it — Badger chases every overdue invoice on schedule, reads the replies, verifies payment claims, and never lets one slip to day 90 unnoticed.