Tax file number
Your tax file number (TFN) is your personal reference number in the tax and super systems.
Your TFN is an important part of your tax and super records as well as your identity, so keep it secure.
Your TFN is yours for life. You keep the same TFN even if you change your name, change jobs, move interstate or go overseas.
You don't have to have a TFN, but without one you pay more tax. You also won't be able to apply for government benefits, lodge your tax return electronically or get an Australian business number (ABN).
Apply for a TFN
How you apply for a TFN will depend on your circumstances:
Can't find your TFN?
- Look on your income tax notice of assessment or other letters from us.
- Look on a payment summary (provided by your employer) or your super statement.
- If you have a myGov account linked to the ATO, you can access your TFN online.
- Ask your tax agent (if you use one).
If you still can't find it, phone us on 13 28 61, 8.00am to 6.00pm, Monday to Friday.
Your TFN identifies you for tax and super purposes. It is an important part of your identity so keep it secure. There are various ways to apply for a TFN depending on your circumstances.