Can you charge interest on late payments?

Late payment costs real money

Late payers cost you twice. You wait longer for cash, then spend time chasing what should have arrived on time. If your paperwork is strong, interest can help recover some of that pain. If your terms are vague, the real fix is not a louder demand. It is cleaner terms before the next job starts. ([business.gov.au](https://business.gov.au/finance/payments-and-invoicing/payment-terms?utm_source=openai))

Clear payment terms reduce late payment, disputes and refusal, and overdue-debt guidance points you back to the contract before you escalate. That matters because interest is only worth chasing if your documents support it. A good clause makes the conversation simpler, and a weak one makes every follow-up harder. ([business.gov.au](https://business.gov.au/finance/payments-and-invoicing/payment-terms?utm_source=openai))

Check the clause you already have

Start with the contract you already signed. Look for wording about interest, late fees, debt recovery costs, due dates and whether any grace period applies. If the clause is there, use the exact process it sets out. If the clause is missing, do not rely on memory or a verbal understanding from the sales call. ([business.gov.au](https://business.gov.au/finance/financial-trouble/what-to-do-when-you-havent-been-paid?utm_source=openai))

That review should cover more than the headline price. Check quotes, purchase orders, acceptance emails and any trading terms attached to the invoice. When the paperwork conflicts, use the signed document hierarchy in your own file, not wishful thinking. If the debt is already overdue, keep the evidence together so your demand is easy to prove later. ([business.gov.au](https://business.gov.au/finance/financial-trouble/what-to-do-when-you-havent-been-paid?utm_source=openai))

Source: Official guidance

Put the interest on the statement

If your terms allow interest, calculate it from the date your contract says it starts. Add it to the running balance on your statements, so the debtor can see the debt growing in real time. Keep the maths simple and consistent. The point is not punishment; it is to make the cost of delay visible. ([business.gov.au](https://business.gov.au/finance/payments-and-invoicing/payment-terms?utm_source=openai))

The letter-of-demand guide specifically asks whether your notice includes a late payment interest rate, and it recommends attaching the contract, invoice and reminder history. That is useful because it keeps the demand grounded in records, not frustration. If the debtor challenges the figure, you want a paper trail that shows how you arrived there. ([business.gov.au](https://business.gov.au/people/disputes/write-a-letter-of-demand?utm_source=openai))

Carry it into the formal demand

If payment still does not come, include the interest in your formal demand and in any court claim, if you decide to go that far. If your claim ends up in Federal Court, the rules say judgment debts carry interest, and they also contemplate pre-judgment interest in some cases. That does not guarantee recovery, but it prevents the interest question being forgotten. ([legislation.gov.au](https://www.legislation.gov.au/F2011L01551/2026-06-11/2026-06-11/text/original/epub/OEBPS/document_1/document_1.html?utm_source=openai))

That same discipline helps if the debtor starts negotiating after a solicitor's letter lands. Keep the unpaid principal separate from accrued interest, then show both figures clearly. You are more likely to get agreement when the debtor can see the debt in layers instead of as one muddy total. Clear lines also reduce arguments later. ([business.gov.au](https://business.gov.au/people/disputes/write-a-letter-of-demand?utm_source=openai))

Fix the paperwork for the next job

If your terms do not mention interest, fix them now for every new job. Update your quote template, trade account form and contract pack so the clause is impossible to miss. Spell out when interest starts, the rate, whether it compounds and how it appears on statements. Clarity now saves chasing later. ([business.gov.au](https://business.gov.au/finance/payments-and-invoicing/payment-terms?utm_source=openai))

Today, pull out one overdue account and check the terms, the statement and the last demand letter. If the clause is there, use it. If it is missing, fix the paperwork before the next quote goes out. If you want help tightening the recovery path, call CRP about debt recovery. CRP coordinates independent qualified professionals, and this is general information only. ([business.gov.au](https://business.gov.au/finance/financial-trouble/what-to-do-when-you-havent-been-paid?utm_source=openai))