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Validate Australia TIN (TFN / ABN)

Free online Tax File Number / Australian Business Number validator. Instant validation using OECD-compliant rules for Australia tax identification numbers.

Validation Workspace

Validate TFN / ABN

Enterprise checks for Australia tax identification numbers.

Instant one-by-one format validation

Country

Australia

Document

TFN / ABN format check

Enter a TFN / ABN to validate for Australia

Awaiting input

Paste values with or without separators. Validation also checks a normalized value.

Use a real TFN / ABN sample to verify format compliance before filing.

About Australia TIN (TFN / ABN)

The Tax File Number / Australian Business Number is the official tax identification number used in Australia. Format: TFN: 8-9 digits, ABN: 11 digits with mod-89 checksum

Valid Examples

  • 123 456 782
  • 51 824 753 556

Invalid Examples

  • 123 456 789 (Invalid checksum)
  • 5 182 475 355 (Too short)

Common Use Cases

  • Tax lodgment
  • Employment
  • Banking
  • Superannuation

Official source: Australian Taxation Office

Frequently Asked Questions

What is a TFN?
The Tax File Number (TFN) is a unique identifier issued by the Australian Taxation Office. Individuals, businesses, and super funds can apply for a TFN.
How is an ABN validated?
The Australian Business Number (ABN) uses a mod-89 checksum. The first two digits form a check number derived from the remaining 9 digits.

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