If you don't know your Tax File Number:
- Look on your income tax notice of assessment or other letters from the ATO
- 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 the ATO on 13 28 61, 8.00am to 6.00pm, Monday to Friday.