The specific details that let your customer claim GST back
Every invoice looks roughly the same at a glance — a logo, an amount, a due date.
But if you're registered for GST, a handful of specific details are what turn an ordinary invoice into a valid tax invoice — and without them, your customer may not be able to claim the GST back.
The short answer
A tax invoice is a specific document, meeting ATO requirements, that lets a GST-registered buyer claim a GST credit on their purchase. If you're registered for GST, you must provide one within 28 days if a customer asks for a taxable sale of $82.50 or more (including GST). If you're not registered for GST, you shouldn't use the words “tax invoice” at all — issue a plain invoice instead.
What every tax invoice needs
The words “Tax invoice” stated prominently.
Your identity and Australian Business Number (ABN).
The date the invoice was issued.
A brief description of what was sold, including quantity where relevant.
The GST amount payable — shown either as a separate figure, or as a statement that the total price includes GST, if the GST is exactly one-eleventh of the total.
The extent to which each item on the invoice is a taxable sale — important if you sell a mix of taxable, GST-free and input-taxed items.
The extra requirement once the sale reaches $1,000
For taxable sales of $1,000 or more (including GST), you also need to show the buyer's identity or ABN on the invoice. A tax invoice built to meet this higher standard can always be used for smaller sales too — so many businesses simply use one consistent format for every invoice, rather than switching styles based on the amount.
The two dollar thresholds worth knowing
| Sale value (including GST) | What applies |
|---|---|
| $82.50 or less | A customer can generally claim GST credits without a tax invoice, using other evidence of the purchase |
| $82.50 to under $1,000 | A tax invoice is required for the buyer to claim GST credits, but no buyer identity is needed on it |
| $1,000 or more | A tax invoice is required, and it must also include the buyer's identity or ABN |
Common mistakes worth avoiding
Using “tax invoice” when you're not GST-registered. If you're not registered for GST, you must not use this term or charge GST — issue a standard invoice instead.
Leaving the GST amount unclear. Disputed invoices very often trace back to GST not being clearly shown — either as a separate figure or an explicit statement that the price includes GST.
Forgetting the buyer's identity or ABN on larger invoices. Missing this on a sale of $1,000 or more can prevent your customer from claiming their GST credit, which tends to generate a frustrated phone call.
Not issuing a tax invoice within 28 days of a request. This is the ATO's expected timeframe once a GST-registered customer asks for one.
A tax invoice doesn't need to be paper
A tax invoice can be issued electronically — a PDF, an emailed invoice, or one generated directly through accounting software — provided it contains all the required information. Most modern invoicing software builds these requirements in automatically once your GST registration is set up correctly, which is one of the more practical reasons to move off manual, ad hoc invoicing early.
A quick self-check
Does my invoice template include every required element for a tax invoice, if I'm GST-registered?
For sales of $1,000 or more, am I including the buyer's identity or ABN?
Is my GST amount always clearly shown, either separately or as an explicit inclusive statement?
If I'm not GST-registered, have I made sure “tax invoice” never appears on my invoices?
Free official resource
The ATO sets out the full tax invoice requirements, including detailed rules for mixed taxable and non-taxable sales.
ato.gov.au — Tax invoices https://www.ato.gov.au/businesses-and-organisations/gst-excise-and-indirect-taxes/gst/tax-invoices
When should you get professional help?
you're setting up your invoicing template or software and want it GST-compliant from the start;
you sell a mix of taxable, GST-free or input-taxed items and want the invoice format handled correctly;
a customer has queried GST on an invoice and you want to confirm it was issued correctly; or
you're not sure whether a specific sale should include GST at all.
Continue learning
→ Do I Need to Register for GST?
→ Understanding BAS — What Am I Actually Reporting and Paying?
→ GST-Free, Input-Taxed and Taxable Sales — What's the Difference?
SKC Accounting | Knowledge Centre | Knowledge Guide 052
Last reviewed: August 2026
General information only. This guide does not take into account your individual circumstances and is not a substitute for professional accounting, taxation, legal or financial advice.