The ATO have been looking closely at this area for many years now and I’m asked quite often “how the ATO will view as a genuine contractor?”
Only contractors and sub contractors that fall into the ATO’s definition are eligible for the full range of deductions applicable to the assessable income derived. The ATO have a handy guide on their website which every person considering a contractor arrangement should consult. See link at Employee or Contractor?
If you feel your case is not clear cut, feel free to call to discuss the particular situation.