Tax file number

Find out why you need a TFN, where to find it and how to keep your TFN and personal details safe.

How to apply for a TFN online or by paper depending on your circumstances and residency status. It is free to apply.

Find your tax file number online with ATO online services. Tell us as soon as possible if your TFN is stolen or misused.

Check how you can update your TFN registration details, including your name, date of birth, bank details and gender.

The identity documents you need to apply for a TFN, ABN or register for GST and who can certify your original documents.