How to find my tax file number

If You’ve misplaced your Tax File Number and wondring How to find my tax file number (TFN) or suspect it might have been stolen, it’s important to take action promptly. Your TFN is crucial for various official purposes like starting a new job, applying for government benefits, lodging tax returns, or even applying for educational loans.

How to find my TFN

Online Services to find TFN:

If you already have a TFN but can’t recall it, you can easily retrieve it through the ATO online services. Simply log in to your myGov account or use the ATO app.

Other Sources to find my tax file number:

  • If you don’t have a myGov account, you can typically find your TFN on:
  • Your income tax Notice of Assessment (NOA) after lodging a tax return
  • Correspondence from the ATO, such as a statement of account
  • Payment summaries or income statements from your employer
  • Your superannuation account statement
  • Alternatively, if you use a registered tax agent, they can also provide you with your TFN upon request.

How to find Lost or Stolen TFN


If your TFN is lost, stolen, or if you suspect it has been compromised by an unauthorized party, it’s crucial to notify the ATO immediately.

Contacting ATO:

You can contact the ATO Client Identity Support Centre at 1800 467 033, Monday to Friday between 8:00 am and 6:00 pm. They specialize in assisting individuals who have experienced identity theft or misuse of their TFN. They can provide guidance on re-establishing your identity and may implement security measures to monitor any unusual activities related to your TFN.

Protecting Your Information

For further tips on safeguarding your personal information, visit the ATO’s guidelines on protecting your data.

Taking these steps promptly can help mitigate any potential risks associated with a lost or stolen TFN and ensure you can continue to manage your tax affairs securely.

Nabeel Arshad
Nabeel Arshad

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