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The Australian Business Number

The Australian Business Number (ABN) is a single identifier for use in business dealings with the Australian Taxation Office (ATO) and with other government agencies.

ABN lookup

Who is entitled to an ABN?

Companies registered under the Corporations Act 2001 and business entities carrying on an enterprise in Australia are entitled to an ABN if they apply.

What happens to your ACN?

Your ABN is based on your ACN but it has 2 additional leading digits and becomes an 11 digit number.

Can I use my ABN instead of my ACN?

Yes, you can use your ABN with your company's name, on company documents, provided that:

What is the Australian Business Register?

When an organisation applies for and receives their ABN, the business details from their application become part of the Australian Business Register (ABR).

The ABR is the central collection, storage and verification system for basic business identity information for all entities with an ABN.

How do I apply for an ABN?

You can apply for an ABN:

Need more information?

If you would like to find out more about the tax system:

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