About your TFN
A tax file number (TFN) is your personal reference number in the tax and superannuation systems. You can apply for a TFN at any age.
It is free to apply for a TFN.
Your TFN is:
- a unique number (usually 9 digits)
- an important part of your identity
- yours for life – you keep your TFN even if you change jobs or name, move interstate or go overseas.
Where to find your TFN
If you already have a TFN, you can find it:
- in the ATO app or your ATO online account if you have a myGov account linked to the ATO
- on your income tax notice of assessment
- on some of the letters we send you
- on an income statement or payment summary from your employer
- on your superannuation account statement.
If you use a registered tax agent, you can also ask them for your TFN.
Contact us as soon as possible if you think your TFN is lost, stolen or being misused.