Australian TFN Generator
AustraliaGenerate valid-format Australian Tax File Numbers (TFN) with correct check digit for testing. TFN is a 9-digit number used for tax and superannuation purposes in Australia.
Generator
Validate TFN
TFN Check Algorithm
Length: 9 digits
Weights: 1, 4, 3, 7, 5, 8, 6, 9, 10
Validation: Sum of (digit × weight) divisible by 11
TFN Usage
- • Tax returns and assessments
- • Employment declarations
- • Superannuation contributions
- • Government benefits
- • Investment income reporting
⚠️ Testing Only
These are randomly generated numbers for testing purposes only. Misuse of TFN is a criminal offence in Australia.
What is This Tool?
An Australian TFN generator creates fictional 9-digit Tax File Numbers with valid check digits. TFNs are issued by the Australian Taxation Office (ATO) and are required for employment, tax returns, and financial transactions in Australia.
TFNs use a weighted checksum algorithm: each digit is multiplied by weights 1, 4, 3, 7, 5, 8, 6, 9, 10, and the sum must be divisible by 11. Numbers cannot start with 0. This generator produces numbers that pass the ATO's validation algorithm.
Common Use Cases
Australian Payroll Testing
Test Single Touch Payroll (STP), PAYG withholding, and TFN declaration form processing.
Tax Software Development
Validate myTax, e-Tax, and commercial tax preparation software with format-correct TFNs.
Superannuation Systems
Test super fund member registration, rollover processing, and ATO SuperStream integrations.
Banking & Investment
Validate TFN input in Australian bank account opening, share trading platforms, and managed fund applications.
Frequently Asked Questions
Are generated TFNs real?
No. TFNs pass the check digit algorithm but are not issued by the ATO and not linked to any taxpayer.
What is the TFN check algorithm?
Multiply each digit by weights (1,4,3,7,5,8,6,9,10), sum products, and verify divisibility by 11.
How many digits is a TFN?
Australian TFNs are 9 digits. Older 8-digit TFNs are prefixed with 0 for compatibility.