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Country guide

Australia

Australia uses the Tax File Number (TFN) for individuals and non-individual taxpayers, and the Australian Business Number (ABN) as the main business identifier that is also used for tax-identification purposes.

AU AUS 2 TIN types Last reviewed 2026-04-19

TIN types

2 published formats. Open a type to see examples, structure details, and official sources.

Validate Australia TIN
Australian Tax File Number (TFN)
Current Individuals Entities

Australian Taxation Office (ATO)

Primary Australian tax identifier used by individuals and by non-individual taxpayers that interact with the ATO.

Details
Examples
123 456 789
Where to find it

On ATO online services and ATO correspondence; for individuals also on notices of assessment, payment summaries or income statements, share statements, health insurance documents, and superannuation statements.

Common names
TFN Tax file number
Official source
oecd.org ato.gov.au abr.gov.au
Australian Business Number (ABN)
Current Individuals Entities

Australian Business Register (ABR)

11-digit business identifier used by businesses and organisations in their dealings with government and also used for tax-identification purposes.

Details
Examples
51 824 753 556
Where to find it

On the ABN registration confirmation, in ABN Lookup, and commonly on invoices and other business documents.

Common names
ABN Australian business number
Structure
1-2 Check digits Two leading check digits derived from the following nine digits.
3-11 Identifier Core nine-digit identifier for the business or organisation.
Official source
oecd.org abr.gov.au abr.business.gov.au ato.gov.au