Does it have to say "Tax invoice" rather than "Invoice"?

In practice, yes. The rule is that the document must show it is intended to be a tax invoice, and those words are the standard way to do it. This page sets the heading for you, and you can change it if you are issuing something else.

What if I do not have an ABN?

You can still invoice, but without an ABN your customer may be required to withhold tax from the payment. Leave the field blank if it does not apply to you.

Should GST be added on top or included?

Either is valid as long as it is clear. Australian pricing is usually quoted GST-inclusive for consumers — choose "Already included" and the GST is shown as part of the total rather than added to it.

Tax invoice template (Australia)

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Set up for Australia: dollars, GST, an ABN field, and the heading the ATO expects. No sign up, no account, nothing uploaded.

Heading Region Currency Paper

Your details

No logo

Upload logo Brand colour

PNG or JPG. Stays in this browser.

Your name or business name

Phone

Address

Tax ID

Bill to

Client name

Client email

Client phone

Client address

Tax ID

Invoice details

Number

Issued

Terms

Due

PO number

Line items

How to pay you

Payment details

Notes

Payment link

Late payment terms

Stored in this browser

Total —

About this document

Australia is specific about this one. For a taxable sale, the document has to show it is intended to be a tax invoice — in practice, by heading it "Tax invoice" rather than "Invoice" — and it has to show your ABN and the GST amount. This page opens with that heading already set, the tax labelled GST at 10%, and the business-ID field asking for an ABN.

Two thresholds are worth knowing. Above $82.50 including GST, a customer who asks for a tax invoice must get one within 28 days, and they need it to claim the GST credit. At $1,000 or more, the invoice must also identify the buyer. At $82.50 or less you are not obliged to issue one, but doing it anyway costs nothing.

What an Australian tax invoice needs

That it is meant to be a tax invoice — normally the words "Tax invoice" at the top
Your identity and your ABN
The date it was issued
A description of the items sold, with the quantity (if applicable) and the price
The GST amount, or a statement that the total includes GST
The extent to which each sale is taxable
The buyer's identity or ABN, for sales of $1,000 or more

This is general information, not tax or legal advice. Requirements differ by jurisdiction and by the kind of work you do — check with your own accountant or tax authority if anything is unclear.

Questions

Does it have to say "Tax invoice" rather than "Invoice"?: In practice, yes. The rule is that the document must show it is intended to be a tax invoice, and those words are the standard way to do it. This page sets the heading for you, and you can change it if you are issuing something else.
What if I do not have an ABN?: You can still invoice, but without an ABN your customer may be required to withhold tax from the payment. Leave the field blank if it does not apply to you.
Should GST be added on top or included?: Either is valid as long as it is clear. Australian pricing is usually quoted GST-inclusive for consumers — choose "Already included" and the GST is shown as part of the total rather than added to it.