Australia tax invoice requirements

For a taxable sale over A$82.50 including GST, the buyer needs a valid tax invoice to claim a GST credit. It must show that it is intended as a tax invoice, your business name and ABN, the invoice date, a description of the items, and the GST amount — or a statement that the total price includes GST. For sales of A$1,000 or more, the buyer's identity or ABN is also required.

Displaying your ABN matters beyond GST: if you do not quote an ABN on an invoice, a business customer may be required to withhold tax from your payment, so it is in your interest to show it.

Because GST is a flat 10%, you add it by multiplying the net price by 1.1. To find the GST already inside a GST-inclusive total, divide the total by 11 — the tax is exactly one-eleventh of the gross price. Show the subtotal, the GST, and the final total so the invoice explains itself.

Run the numbers in the GST calculator first, then carry them into the quote or invoice generator so the document matches what you will report.

Below A$1,000 a tax invoice needs your identity and ABN but not the buyer's. At A$1,000 or more it must also identify the buyer — their name or their ABN. Templates built for small sales frequently omit the buyer's details entirely, which means a business quietly issuing non-compliant invoices as soon as its job sizes grow past that point.

The practical fix is to include the buyer's name and ABN on every invoice regardless of value. There is no downside to showing more than required, and it removes a threshold you would otherwise have to watch on each document.

If you do not quote an ABN, a business customer is generally required to withhold a substantial share of the payment and remit it to the ATO under the no-ABN withholding rules. You eventually recover it through your return, but in the meantime a large part of the invoice simply does not arrive.

This applies whether or not you are registered for GST. A sole trader below the A$75,000 threshold charges no GST but still needs an ABN on the invoice — the two are separate registrations answering separate questions, and conflating them is the most common cause of a withheld payment.

If you are not GST-registered, do not label the document a tax invoice and do not show a GST line. Calling an invoice a tax invoice when no GST applies misrepresents it and invites the customer to claim a credit that does not exist.

An invoice containing both taxable and GST-free items must make clear which is which — showing the GST for each taxable line, or identifying the GST-free items explicitly. A single total with one GST figure does not let the customer work out what they can claim, and it is the point where invoices for mixed grocery, health or education supplies most often go wrong.

For rounding, calculate GST on the total rather than line by line where you can. Summing individually rounded lines can shift the total by a cent or two against what the customer's system computes, and those differences accumulate into reconciliation work neither side wants.