Tax File Numbers

View printable version of this page

Tax file numbers (TFNs) are unique numbers issued by the Australian Taxation Office to identify individuals, companies and others who lodge income tax returns with the office. Individuals who do not quote their TFN to employers and financial institutions have tax deducted from their income or interest payments at the highest marginal rate. Quotation of TFNs is also a condition of receipt of most Commonwealth government assistance payments.

For information regarding tax file numbers please go to the tax file number page of this web site. That page contains the following information: TFN guidelines, details of the TFN audit process, TFN audit manual, and TFN compliance notes.

Unauthorised use or disclosure of tax file numbers is also an offence under the Taxation Administration Act 1953. The tax file number rules are also partly contained in the Income Tax Assessment Act 1936.

Back to Top