Are the generated TFNs valid or registered?

No. They conform to TFN format requirements and checksum patterns but are arbitrary and never registered with the ATO.

Yes. You may copy a single TFN or export multiple in CSV for easy use in testing environments.

How do I validate a valid TFN?

Valid TFNs can be validated by the ATO or authorized service providers. Our generator does not use authentic ATO records.

Yes. A genuine TFN is private personal information and should be revealed only to trusted parties such as the ATO, employer, bank, or super fund

What do I do if I lose my TFN?

You can search for it in official records (e.g., tax assessment, employer summary) or recover it via your ATO account. If lost, report to the ATO immediately

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Validate TFN

The Tax File Number (TFN) is a unique identifier issued by the Australian Taxation Office to individuals and organizations. It's used for tax purposes and accessing government services.

About TFN

Tax File Number for individual taxation and government services

Features

Generate valid TFN numbers that pass official validation
Bulk generation for testing multiple scenarios
CSV export for easy integration with test suites
Real-time validation with detailed error messages
Support for multiple formats and variations

Note: JavaScript is required to use the validation tool. The interactive form will load once JavaScript is enabled.

How to Use

Enter the number of TFNs you need
Configure any additional options (state, country, etc.)
Click the generate button
Copy results or download as CSV

Example Format

777274955

All generated TFNs follow official formatting standards.

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Frequently Asked Questions

Common questions about TFN validation.

What is a TFN?

A Tax File Number (TFN) is an 8–9 digit number, specific to you or your business, from the Australian Taxation Office (ATO) for tax and identity purposes. A 9‑digit TFN is usually provided to individuals

Why do I need a TFN?

You require a TFN to: - Lodge tax returns online - Start work - Obtain government benefits or super contributions Without this, you may be charged at the maximum rate or not receive service

What is the correct structure of a TFN?

A genuine TFN always contains exactly 9 numeric digits (i.e., 123 456 789) Sprintlaw

Is the TFN generator free and legal?

Yes. It's totally free and generates valid-format TFNs solely for testing and development environments. They are fictitious and must not ever be utilized for genuine tax or legal purposes.

Can I generate multiple TFNs at one time?

Yes. You can generate between 1 to 100 TFNs in a single operation—ideal for populating demo databases or system testing.