Getting Paid on Time

Why late payment starts at the invoice

Most business owners blame their customers for late payment. The uncomfortable truth is that the majority of late payments begin with a problem in the invoice itself — or with how and when it was issued. A vague invoice gives a reluctant payer an excuse. A late invoice resets the clock. An invoice that doesn't clearly state terms leaves the debtor to set their own.

Before you can chase a payment, you need an invoice that is beyond dispute. This lesson covers the fundamentals of invoicing discipline — the habits that make the entire collection process smoother downstream.

The anatomy of an invoice that gets paid

Every invoice you issue should contain the following, without exception:

Your full legal entity name and ABN

Not just a trading name. Your legal name is what appears in contracts and what a court will recognise. If you operate as a company, use the company name and ACN. If you are a sole trader, use your full name and ABN.

A unique invoice number

This is how you track the debt, how the customer references payment, and how you prove the invoice exists in a dispute. Sequential numbering is fine; gaps are not a problem as long as every invoice has one.

Issue date and due date

Both, stated explicitly. "Due 14 days from issue" is not enough — customers interpret it differently. State the actual due date: "Payment due: 15 July 2026." There is no ambiguity.

A description of goods or services rendered

Specific enough that neither party can dispute what was delivered. Vague descriptions — "consulting services" — are a common grounds for dispute. "Strategy consultation, 3 hours, 1 June 2026 per signed engagement letter dated 20 May 2026" is not. Reference any supporting documents (purchase orders, signed quotes, or agreements) by document number and date.

Your payment terms

State them on the invoice itself, every time. "Net 14 days" or "Payment due within 14 days of invoice date." If you charge interest on overdue amounts under your terms of trade, say so. The ACCC/ASIC guidelines require that you only charge interest if it was agreed in advance — which means it must be in your terms and referenced on the invoice.

Your bank account details

BSB and account number, clearly labelled. If you accept card payments, include the link. Remove every obstacle to payment. A customer who wants to pay but can't find your account details is a missed collection.

GST treatment

If you are GST-registered, the invoice must show the GST-exclusive amount, the GST amount, and the GST-inclusive total. A tax invoice is a legal document — errors create disputes and delay payment.

Payment terms: what the numbers actually mean

The most common payment terms in Australian commercial trade are Net 14, Net 21, and Net 30. "Net" means the full invoice amount is due — no discount applies — within that number of days from the invoice date.

Net 14 is the Australian commercial norm for trade services and professional services. Net 30 is common in larger corporate supply chains, but it is a concession to the customer, not a legal requirement. Many small businesses drift to 30-day terms because they copied a template or mirrored what a large customer told them — often without realising they could negotiate.

A practical rule: issue invoices on Net 14 terms unless your customer specifically requires otherwise and the relationship justifies the concession. If a large client insists on Net 45 or Net 60, factor that cash flow cost into your pricing. Longer payment terms have a real cost — the late payment calculator at tools.merion.com.au can show you exactly what extended terms cost your business in working capital each year.

You can also include early payment discount terms — for example, "2% discount if paid within 7 days" — though these are more common in product supply than in services. If you offer them, calculate whether the discount cost is worth the cash flow benefit.

Deposits and progress payments

For project-based work — construction, custom manufacturing, event planning, consulting engagements over several weeks — deposits and progress payments are essential tools. They serve two purposes: they reduce your exposure if the customer doesn't pay, and they test the customer's willingness to pay before you are fully committed.

A customer who delays or disputes a deposit payment before the work begins is a warning sign (see Lesson 3 for more on spotting trouble early). A customer who pays promptly is demonstrating that they can and will pay.

Standard deposit structures vary by industry, but common arrangements include:

• 30–50% upfront deposit on acceptance of quote, with the balance on completion
• Progress payments tied to project milestones (e.g., 30% on commencement, 40% at practical completion, 30% on handover)
• Monthly invoicing in arrears for ongoing retainer or consulting engagements

Whatever structure you use, document it in the signed agreement or quote before work starts. A deposit clause that only appears on the invoice — not in a signed agreement — can be harder to enforce.

Issue invoices promptly

Issuing invoices promptly is one of the highest-return disciplines a small business can adopt. Delaying the invoice delays the payment clock. A job completed on Friday that isn't invoiced until the following Wednesday has already lost five days of the payment term.

Best practice: invoice on the day of completion, or on the next business day at the latest. For recurring work, invoice on the same day each billing period so the customer can anticipate it.

If your invoicing is delayed because it requires information from others (timesheets, materials lists, subcontractor invoices), build a process to collect that information in real time rather than at month end. The cost of the workflow change is almost always less than the cost of the delayed cash flow.

Related tools and resources

• Invoice reminder templates — pre-written reminder sequences from the first friendly nudge to formal demand
• Late payment cost calculator — see what slow payers are really costing your business
• Credit Control Playbook — Merion's full guide to proactive receivables management