TFN Format Checker
Check whether a nine-digit Tax File Number has a valid check digit.
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How to do it
- 1Add the text
Paste or type the text or amount here.
- 2See the result
The result appears right away as you type.
- 3Copy it
Copy the result and use it anywhere. Your text goes nowhere.
About this tool
Type a nine-digit TFN. The tool tests the check digit with the standard weighting rule, so it catches typing mistakes. Nothing is sent anywhere. Never share a TFN with people you do not trust.
Frequently asked questions
Is my TFN stored?
No. It is checked in your browser and not sent or saved.
Does it confirm my TFN is issued?
No. It only tests that the digits are consistent. Only the ATO can confirm a TFN.