My worker has queried what they should select on the Basis of Employment question on the TFN. Full Time, Part Time or Casual

The basis of employment doesn't impact your tax selections.

Given that we do not know a contractor's personal tax or engagement situation; Oncore aren't able to provide specific advice on what to select. However, the selection that is made to employment type does not impact the manner in which they are taxed. A contractor would make the selection that best represents the hours of work that will be undertaken (for example are they full time hours, part time or ad-hoc on a casual basis). You may find this ATO article helpful