A TFN is a unique number we issue to individuals and organisations to help us administer tax and other Australian Government systems.
We only issue one TFN to you during your lifetime, even if you change your circumstances such as your name or residency. You should keep your TFN secure at all times and advise us if you change your name or address so we can update your details.
If you have lost your TFN or are not sure you have one, check all your correspondence from us or contact your tax agent.
If you still cannot find your TFN or would like to update your details, phone +61 2 6216 1111 between 8.00am and 5.00pm, Monday to Friday and ask to be transferred to Personal tax enquiries. If you phone us, we need to know we are talking to the correct person before discussing your tax affairs. We will ask you for details that only you, or your authorised representative, would know.
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