TFN Format Checker
Check whether a nine-digit Tax File Number has a valid check digit.
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How to do it
- 1Fill in the boxes
Type your numbers or pick the options you need.
- 2See the result
The answer updates right away as you change a value.
- 3Use it
Copy the result or note it down. Nothing is sent anywhere.
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.