Australia doesn't have a national ID number, and neither does New Zealand. You have a TFN [1] (tax file number) in Australia, which are similar to an SSN, exce

Australia doesn't have a national ID number, and neither does New Zealand. You have a TFN [1] (tax file number) in Australia, which are similar to an SSN, except somewhat more limited. My TFN is only used for income tax, not for identification, and I'm not actually legally required to supply it to anybody, even my employer (although it does make paying taxes a real pain as they withhold the maximum amount). You aren't even legally required to have a TFN, although once you get one you have it for life, and without one you pay the maximum income tax. TFNs are specifically forbidden to be used for anything other than income or benefit purposes too. Businesses aren't allowed to ask for it as a form of ID. [1] https://en.wikipedia.org/wiki/Tax_file_number https://en.wikipedia.org/wiki/Tax_file_number