Format guidance · Verified checks when available
Australia TIN validator
Review the expected Australia TFN / ABNstructure before you save it, send it to an API, or include it in a tax workflow. Interactive validation appears only after this country's rules pass authoritative-source verification.
Private by design
Transient validation, no public history
TINs are sent securely to the canonical validation API, processed in real time, and not persistently stored by the public checker.
How Australia tax IDs are formatted
In Australia, the tax identifier is commonly known as Tax File Number / Australian Business Number (TFN / ABN). The expected format is TFN: 8-9 digits, ABN: 11 digits with mod-89 checksum. Teams usually need a Australia TFN / ABN check around tax lodgment, employment, banking, or before a record moves into billing, onboarding, or compliance review.
Valid examples
123 456 78251 824 753 556
Invalid examples
- 123 456 789 (Invalid checksum)
- 5 182 475 355 (Too short)
What this page covers
Format details below are guidance from public sources. Automated pass/fail results are offered only when the backend catalog marks this country as verified syntax.
Format and length
Confirms the number follows the expected Australia pattern: TFN: 8-9 digits, ABN: 11 digits with mod-89 checksum.
Useful examples
Shows valid and invalid-looking samples so you can compare spacing, separators, letters, and digit counts before submitting real data.
When people usually check this number
- Tax lodgment
- Employment
- Banking
- Superannuation
A format match does not prove that a Australia tax ID belongs to a specific person or business. Use the result as a first-pass data quality check, then confirm sensitive cases with official records.
Official source: Australian Taxation Office
Last reviewed: May 23, 2026. We update country guidance when public format rules change.
How to check a Australia TFN / ABN
Use this check before a record reaches billing, tax reporting, or manual review.
Enter the TFN / ABN
Paste or type the Australia tax identifier exactly as it appears in your source record. Spaces and separators are fine when they are part of the expected format.
Review the format result
Check whether the number matches the Australia syntax currently implemented here. The result does not query a tax-authority registry or confirm ownership.
Confirm important records
For onboarding, tax reporting, or compliance work, treat the result as a data-quality signal and confirm high-risk records with Australian Taxation Office or your internal process.
Frequently asked questions
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