You can find your Tax File Number (TFN) in several ways:

1. Online via myGov: If you have a myGov account linked to the Australian Taxation Office (ATO), you can sign in and select "Find my TFN" to view your number.
2. Documents: Your TFN may appear on your income tax notice of assessment, payslips, payment summaries, ATO letters, or superannuation statements.
3. Employer or Tax Agent: You can ask your employer or registered tax agent if they have your TFN on file.
4. Contact the ATO: You can call the ATO directly for assistance in finding your TFN. They will verify your identity before providing the number.

If you don't have a myGov account, creating one and linking it to the ATO is a helpful way to access your TFN online safely. If your TFN has been lost or stolen or if you suspect misuse, contact the ATO's Client identity support centre immediately for advice and security measures. These methods offer secure and straightforward ways to find or recover your TFN.