Tax File Number

Tax File Number (TFN) is an 8 or 9 digit number issued by the Australian Taxation Office (ATO) to each taxpayer (individual, company, superannuation fund, partnership or trust) to identify that taxpayer's Australian tax dealings. When it was introduced in 1988, individuals received a 9 digit TFN and non-individuals were issued an 8 digit TFN. Now both are issued 9 digit TFNs. 10 digit TFNs are expected in the future, but none have yet been issued.

Strict laws ensure that tax file numbers may be recorded or used only for specifically authorised tax-related purposes. Not all individuals have a TFN. A business has both an Australian Business Number (ABN) and a tax file number; and if income is earned as part of carrying on its business, it may quote its ABN instead of its TFN.

The TFN serves a purpose similar to the American Social Security number, but its use is strictly limited by law to avoid the functionality creep which has affected the US counterpart.

Read more about Tax File Number:  Operation, Issuing, Exemptions, Check Digit

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