Invoicing Best Practice

Why it matters

A vague or late invoice hands a reluctant payer an excuse, and an excuse is all many slow payers need. If the amount is unclear, the due date is missing, or the document arrives weeks after the work, you have effectively invited a delay. By the time you chase, the conversation is already on the back foot.

Good invoicing is not paperwork for its own sake. It is the first and cheapest control in your whole credit process. Every later step — the reminder, the statement, the call, the letter of demand — is easier and more credible when the original invoice is clean, prompt and unarguable. Treat the invoice as the opening move in getting paid, not an afterthought once the job is done.

What every invoice must include

An invoice is only as strong as it is complete. Every document you send should carry the same core fields, in the same place, so a customer can approve it at a glance and your own records stay tidy. At a minimum, include:

• your full legal name and ABN;
• a unique, sequential invoice number;
• the issue date and an explicit due date;
• a clear description of the goods or services supplied;
• the amount payable, with GST shown if you are registered;
• your payment terms and remittance details.

Missing any of these gives the customer room to query rather than pay, and each query buys them time. A unique number also lets both sides refer to the same document without confusion when a dispute, credit note or part-payment later arises.

Stating terms that stick

Terms only work if the customer agreed to them before the work started. Burying them on the back of an invoice they receive after delivery is too late to be enforceable in any practical sense. State your terms in the quote, the order confirmation and the invoice, and keep the wording identical across all three.

Be concrete. An explicit calendar due date — 'Due 14 March 2026' — is far harder to argue with than a casual 'net 14'. If your terms allow interest or recovery costs on overdue amounts, say so plainly and consistently, because you can only later rely on a term the customer can reasonably be taken to have accepted.

Deposits and progress claims

For larger or longer jobs, do not carry all the risk to the end. A deposit before you start confirms commitment and funds your early costs. Progress claims at agreed milestones keep your exposure low and surface payment problems while you still have leverage and unfinished work in hand.

Spell out the schedule in writing: how much is due, when, and against what trigger. That removes the 'I'll pay when it's all finished' conversation before it can start. If interest or charges may apply to overdue stages, model the cost first with the free late-payment calculator so your terms are realistic rather than aspirational.