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Lost or stolen TFN

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

Last updated 18 June 2024

Find your TFN online

You will need your tax file number (TFN) when:

  • starting a new job
  • applying for government benefits
  • lodging a tax return
  • applying for higher education loans.

If you already have a TFN and don't remember the number, you can find it online in ATO online services.

You will need to sign in to your myGov account or login to the ATO app.

Sign in to myGov Login to the ATO app

If you don't have a myGov account, see Create a myGov account and link it to the ATO.

Other ways to find your TFN

If you don’t have a myGov account, you can usually find your TFN on:

  • your income tax notice of assessment (NOA), if you have lodged a tax return
  • letters you have received from us, such as a statement of account
  • a payment summary or income statement (provided by your employer)
  • your superannuation account statement.

If you use a registered tax agent, you can ask them for your TFN.

If you still can't find your TFN after checking these options, phone us.

If your TFN is lost or stolen

If your TFN has been lost, stolen or an unauthorised third party has access to it, tell us as soon as possible.

If you suspect misuse of your TFN, phone our Client identity support centre on 1800 467 033 between 8:00 am and 6:00 pm, Monday to Friday. The support centre helps people who have had their identities stolen or misused.

They will give you information, advice and assistance to re-establish your identity. They may also apply security measures that will monitor any unusual or suspicious activity on your account.

For more information about protecting your personal information, see Protect your information.