Tax file number - application or enquiry for individuals

Who should sign your application?

If you are:

• 12 years or younger - your parent or guardian must sign on your behalf
• 13 to 15 years old - you or your parent or guardian can sign
• 16 years or older - you must sign your application.

If are unable to sign your own application because of a disability and you are:

• 15 years or younger - your parent or guardian can sign on your behalf
• 16 or 17 years old - your parent or guardian can sign, but they must provide a signed statement from a doctor explaining your circumstances
• 18 years or older - a court appointed guardian must sign and provide proof of identity and legal proof of guardianship, such as a power of attorney or a court order.

If you complete a TFN application on behalf of another person, this does not give you the authority to ask about their tax matters.