Your TFN is a 9-digit number, issued by the Australian Taxation Office (ATO), that’s unique to you. It’s an important part of your tax and super records so keep your TFN secure.
You keep the same TFN for life - even if you change your name, address or job.
If you don’t have a TFN, you can apply for one online.
Can’t find your TFN? It will be on your income tax notice (notice of assessment), group certificate or super statement, or in your myGov account.
Any interest earned on your bank accounts is part of your assessable income, and needs to be reported to the Australian Tax Office (ATO).
If you don’t provide your TFN or exemption, we’re required to deduct Withholding Tax at the highest tax rate plus Medicare Levy on all accounts that don’t have a TFN or TFN exemption .
Some people (or organisations) can claim TFN exemptions e.g. certain pensioners, most under 16s and certain non-profit organisations. Check with the ATO to see if you’re eligible.
If you have any joint accounts, each account holder must provide their TFN option individually.
The CommBank app is free to download however your mobile network provider charges you for accessing data on your phone. The CommBank app is available on Android operating systems 4.1+ and iOS operating system 8.0+. Terms and conditions are available on the app. NetBank access with NetCode SMS is required. Full terms and conditions available on the CommBank app.