What Must Be on an Australian Tax Invoice — ATO Requirements Explained

If you have ever wondered whether your invoices are actually correct according to the Australian Taxation Office, you are not alone. Many small business owners and freelancers send invoices every week without realising they are missing required information. This guide covers everything the ATO requires so you can invoice with confidence.

The Difference Between an Invoice and a Tax Invoice

A regular invoice is simply a request for payment. A tax invoice is a specific legal document that meets ATO requirements and allows your client to claim GST credits.

If your business is registered for GST, you must issue tax invoices — not regular invoices. The difference matters because your clients need a valid tax invoice to claim back the GST they paid. If your invoice is missing required information, your client cannot claim their GST credit and they may come back to you asking for a corrected version.

When Must You Issue a Tax Invoice?

You must provide a tax invoice when all three of these apply: your business is registered for GST, the sale is $82.50 or more including GST, and your customer requests a tax invoice within 28 days of the sale.

In practice, most businesses provide a tax invoice automatically for every sale regardless of the amount. This is the safest approach and avoids any awkward conversations with clients.

ATO Requirements for Sales Under $1,000

For most everyday transactions, the ATO requires these seven things on your tax invoice:

1. The words "Tax Invoice". This exact phrase must appear clearly on the document. Writing just "Invoice" is not sufficient. The ATO is specific about this — your document must say "Tax Invoice."

2. Your business name. Use your full registered business name. If you are a sole trader operating under your own name, use your full legal name. If you trade under a registered business name, use that.

3. Your ABN. Your Australian Business Number must appear on every tax invoice. Without it, the invoice is not valid. You can find your ABN at abn.business.gov.au if you have forgotten it.

4. The date. Include the date the invoice was issued. This is important for both your records and your client's records.

5. A description of what was sold. Be clear and specific. "Consulting services" is acceptable but "Website design consultation — 3 hours at $150/hour" is better. The description should leave no doubt about what the client is paying for.

6. The GST amount. You must show either the GST amount separately or include a statement that the total price includes GST. The clearest approach — and the one clients prefer — is to show three lines: Subtotal, GST (10%), and Total.

7. The total price including GST. Show the final amount the client owes including GST.

ATO Requirements for Sales of $1,000 or More

For larger invoices, two additional pieces of information are required:

8. The buyer's identity. Include the client's name or business name. For business clients, their ABN is also acceptable.

9. The buyer's address or ABN. Include either the client's physical address or their ABN. For most B2B transactions, using their ABN is cleaner.

What About GST-Free Sales?

Some goods and services in Australia are GST-free, meaning you do not add GST to the price. Common examples include most fresh food, some medical services, and certain educational courses.

If you make a GST-free sale, you can still issue a tax invoice but the GST amount will be zero. You should note on the invoice that the supply is GST-free.

If you sell a mix of taxable and GST-free items on the same invoice, show each separately so the client can see which items attracted GST.

The Correct Way to Show GST on Your Invoice

Many business owners get this wrong. Here is the correct format: Subtotal (excluding GST) $1,000.00, GST (10%) $100.00, Total (including GST) $1,100.00.

Never just write the total and add a note saying "includes GST" without showing the actual GST amount. While this technically meets the minimum ATO requirement for invoices under $1,000, it makes life difficult for your clients and looks unprofessional.

Common Mistakes That Make Your Invoice Invalid

Missing ABN: the single most common mistake. No ABN means no valid tax invoice.

Wrong business name: using a nickname or shortened version of your business name instead of the registered name.

No date: forgetting to include the invoice date, which matters for tax records.

Just writing "Invoice" instead of "Tax Invoice": these two words are required by the ATO.

Not showing GST separately: writing "Total $1,100 inc. GST" without showing the $100 GST component.

Incorrect GST calculation: GST is 10% of the pre-GST price. On a $1,000 service, GST is $100 — not $109.09. A common error is calculating 10% of the GST-inclusive price.

How Long Must You Keep Tax Invoices?

The ATO requires you to keep records of all tax invoices — both the ones you issue and the ones you receive — for five years. Store them digitally as PDF files to make this easy.

Checking Your Invoice Against the ATO Requirements

Before sending any invoice, run through this quick checklist: Does it say "Tax Invoice" at the top? Is your business name correct? Is your ABN included? Does it show the date? Is there a clear description of goods or services? Does it show the GST amount separately? Does it show the total including GST? For invoices over $1,000, does it include the client's name and address or ABN?

If you answered yes to all of these, your invoice meets ATO requirements.

This article is for general information purposes only. For advice specific to your tax situation, consult a registered tax agent or accountant.