To apply for a tax file number, visit the Australian Tax Office website. You can still continue with enrolling if you do not have a Tax file number, selecting to Pay Fees Upfront. You then have up until the census date of your first semester of study, to add your tax file number to your 'Student Finances' information in mySC.
If you do not provide the tax file number at census date then your enrolment will be cancelled.
If you have any questions, contact Student Fees.