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.