How to Create a Valid Tax Invoice in Australia (2026 Guide)

Getting your invoicing right in Australia starts with one decision most guides skip: is the document you are issuing a tax invoice, or just an invoice? The two are not interchangeable, and which one you are allowed to issue depends entirely on whether you are registered for GST. This guide covers that distinction, the ATO's tax invoice checklist, a worked GST example, common mistakes, and record-keeping basics.

Tax Invoice or Just an Invoice? It Depends on GST Registration

In Australia, "tax invoice" is not a generic label you can put on any bill - it is a specific document with a legal meaning, and it is only for GST-registered businesses.

• Registered for GST? You issue a tax invoice. The words "Tax Invoice" must appear on it, it must show GST, and it must carry the ATO's required details (covered below).
• Not registered for GST? You issue a normal invoice - not a tax invoice. You must not use the words "Tax Invoice" and you must not show a GST amount or charge GST on the sale.

This is the single most useful thing to get right as an Australian sole trader who has not yet crossed the GST threshold: calling an ordinary invoice a "tax invoice" and adding a GST line when you are not registered is not just a labelling slip, it misstates what the document is.

When Do You Need to Register for GST?

You must register for GST once your business turnover is, or is expected to be, A$75,000 or more in a 12-month period. You have 21 days from the date you reach or expect to reach that threshold to register. Note that an ABN is not the same thing as GST registration - you need an ABN first, then you register that ABN for GST once you are required to (or choose to).

You can also voluntarily register below the threshold if you want to claim back the GST on your business expenses. Once registered, your GST activity is reported on your BAS (Business Activity Statement), not a separate "GST return".

If you are not yet GST-registered, do not add GST to your invoices or use the words "Tax Invoice". For a wider look at what registration changes for a sole trader, see the AU sole trader expenses guide.

Australian Tax Invoice Requirements: A Compliance Checklist

The ATO scales what is required to the value of the sale. For most trade invoices - between A$82.50 and A$1,000 - a compliant tax invoice needs seven details:

• The words "Tax Invoice" stated prominently
• Your identity (business or trading name)
• Your ABN
• The date the invoice was issued
• A brief description of the goods or services supplied, with quantity where applicable, and the price
• The GST amount, shown separately, or a clear statement that the price includes GST
• The extent to which each sale on the invoice is a taxable sale, if any line items are GST-free

The obligation to provide a tax invoice at every value tier is request-triggered: if a customer asks for one, you must give it to them within 28 days. For sales of A$82.50 or less, you don't have to provide one even on request. Above that, once a customer asks, the same seven details apply, plus the buyer's identity or ABN once the sale reaches A$1,000. Most businesses (Invio included) issue a tax invoice automatically on every sale as good practice - that's a choice, not a separate legal requirement on top of the request-trigger above.

Notice what is not on that list: there is no requirement for a sequential invoice number. It is genuinely good practice - it makes your own records and any ATO review far easier to follow - but it is not one of the ATO's required fields, and you should not treat it as one. For the full breakdown by invoice value, see the AU tax invoice requirements guide.

Worked GST Calculation Example

Here is how the numbers look on a real invoice. An electrician completing a switchboard safety upgrade itemises the job as follows (or use the GST calculator to check the maths instantly):

Subtotal (excl. GST): $380.00

GST at 10%: $380.00 × 0.10 = $38.00

Total payable (incl. GST): $380.00 + $38.00 = $418.00

The invoice shows each line excluding GST, the subtotal excluding GST, the GST amount separately ($38.00), and the total the client actually pays ($418.00). Because the total sits between A$82.50 and A$1,000, this invoice needs the seven required details above - it does not need the buyer's identity or ABN, which only kicks in at A$1,000 and over.

Quick GST formulas to remember:

• To add 10% GST to an exclusive price: multiply by 1.1 (e.g. $380.00 × 1.1 = $418.00)
• To find the GST in a GST-inclusive total: divide the total by 11 (e.g. $418.00 ÷ 11 = $38.00 GST)
• To find the GST-exclusive amount from an inclusive total: divide by 1.1 (e.g. $418.00 ÷ 1.1 = $380.00)

Common Tax Invoice Mistakes to Avoid

• Using "Tax Invoice" without being GST-registered: Only GST-registered businesses may use this wording or show a GST amount. If you are not registered, issue a plain "Invoice".
• Missing ABN: Your ABN is a mandatory field on a tax invoice, not optional. It also matters even before you are GST-registered - a business client who pays you without an ABN on the invoice may be required to withhold tax from the payment (see below).
• Wrong date: Use the invoice issue date. It is one of the required fields.
• Unclear GST treatment: Show the GST amount separately, or clearly state that the price includes GST. Do not leave the reader to guess.
• GST calculation errors: The most common mistake is applying an NZ-style 15% or dividing by the wrong number. Australian GST is 10%, and the inclusive-to-GST shortcut is dividing by 11, not 15 or 23.
• Missing buyer details on invoices of A$1,000 or more: Add the buyer's identity or ABN once the sale reaches that threshold.
• Charging GST when not registered: You cannot charge or collect GST if you are not registered for it.

One more cash-flow mistake worth knowing about even though it is not strictly an invoicing error: if you invoice a business client and do not quote an ABN, the payer is generally required to withhold tax - at close to half the payment - and send it to the ATO instead of you. Putting your ABN on every invoice avoids this. See the ABN invoicing guide for the full rule.

Record-Keeping for Tax Invoices

Good record-keeping protects you if the ATO ever reviews your GST reporting and makes completing your BAS faster. The rules:

• Keep tax invoices and GST records for at least 5 years - both the ones you issue (your sales) and the ones you receive (your purchases and expenses)
• Electronic copies are accepted - a digital folder system or cloud storage is fine, as long as it is a true and clear copy of the original
• If you claim GST credits on a business expense, you need the supplier's tax invoice showing their ABN and the GST amount

Invoicing software keeps your issued tax invoices organised and accessible automatically. Invio calculates 10% GST on every line and keeps every tax invoice you send in one place, ready to hand to your bookkeeper or accountant at BAS time. See how Invio handles GST.

Free Tax Invoice Template Download

We have created a free, ATO-aligned tax invoice template that you can download and use today:

Download Free AU Tax Invoice Template (HTML)

The file opens in your browser so you can edit the yellow fields, then click Download or Print/PDF to keep your customised copy. For the full list of required fields by invoice value, see the AU tax invoice requirements guide. If you prefer a ready-to-use layout with your branding, open the AU invoice template instead. For a step-by-step walkthrough of the whole invoicing workflow, the how to invoice as a sole trader guide covers everything from setup to sending.

Automate Your Invoicing with Invio

Tired of manually calculating GST, checking which tier applies, and chasing payments? Invio automates the parts that are easy to get wrong:

• Automatic GST calculations at 10%
• Invoices that show the right wording and fields for your GST-registration status
• Recurring invoices for repeat clients
• Automated payment reminders
• AUD by default, built for Australian tradies and sole traders

Start using Invio today - or compare plans.

Frequently Asked Questions

Can I use a quote as a tax invoice?

No. A quote is not a tax invoice. Issue a tax invoice once the goods or services have actually been supplied and you hold the required details.

How long must I keep tax invoices?

At least 5 years, for both invoices you issue and those you receive.

What if a customer asks for an invoice but I am not GST-registered?

Issue a regular invoice. It must not say "Tax Invoice", and it must not show a GST amount, because you are not charging GST.

Do I need an ABN on every invoice?

If you are GST-registered, your ABN is a mandatory field on every tax invoice. Even before you are GST-registered, putting your ABN on your invoices is worth doing - without it, a business client may be required to withhold tax from what they pay you.

What is the GST rate in Australia?

Australian GST is 10%. To find the GST component of a GST-inclusive total, divide by 11.