What do I choose on the "Basis of Employment" on the TFN?

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