Australia TFN Validator
Validate Australia TFN
Enter an Australian Tax File Number to verify its validity.
Other Australian Identifiers
About this Validator
This tool validates Australian Tax File Numbers (TFN) according to the official format and validation rules established by the Australian Taxation Office (ATO).
The validator checks if a given TFN follows the correct structure and verifies the check digit using the modulo 11 algorithm.
This validation only confirms if a TFN follows the correct format. It does not verify if the number is actually registered with ATO.
What is an Australian TFN?
The Tax File Number is a unique identifier issued by the Australian Taxation Office (ATO) to taxpaying entities. It's used for data matching and tax-related purposes, with strict laws governing its use.
TFN is used to match income data from: • Wages and salaries (PAYG) • Bank interest • Dividends from companies • Superannuation payments • Government benefits
TFN Protection: • Use strictly limited by law • Optional to quote in many cases • Protected against functionality creep • Subject to privacy regulations
If you need to generate a TFN for testing purposes, here is an Australian TFN Generator