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A comment on Finding former Australian Prime Minister Tony Abbott's passport number (2020). Parent comment

Re:Finding former Australian Prime Minister Tony Abbott's pa... by bigDinosaur on Sunday June 29, 2025 @11:40PM (#44419115)
The Australian Tax File Number is presumably more similar to the Social Security ID? Millions of Australians don't have a passport. You don't need one for much - it's perhaps the easiest way of verifying citizenship if you already have one but not the only way.
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Re:Finding former Australian Prime Minister Tony Abbott's pa... by throwaway422432 on Monday June 30, 2025 @12:42AM (#44419464)
You would only have a TFN if you are working and potentially paying tax. So generally anyone under 16 would not have one.

Closest might be a Medicare Card which gives you access to free/discounted public health that can be used as part of identification. Usually children are on their parents card.

Drivers licence is also a primary identifier, and students can use their school student id.

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