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  • Tax file number

    A tax file number (TFN) is your personal reference number in the tax and superannuation systems.

    It is free to apply for a TFN.

    Your TFN is:

    • an important part of your tax and super records
    • an important part of your identity – make sure you keep it secure
    • yours for life, even if you change your name, change jobs, move interstate or go overseas.

    You don't have to have a TFN, but without one you pay more tax. You also won't be able to apply for government benefits, lodge your tax return electronically or get an Australian business number (ABN).

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    Last modified: 12 Aug 2020QC 22600