Didn't think I would be using PC to ask an IT work question on trusts but here goes! We have developed a system for contractors to register to work for our company but to do so they need to have an ACN and be registered for GST. We use the business.gov site to perform the lookup which then pre-populates additional information available from that tool. Just recently we came across a contractor unable to continue because the business.gov website could not identify they had an ACN. I then looked this up on the ASIC website which found this ACN and noted it was a trust. That trust however was not linked to that same persons ABN. So to get around this we have updated our system so that the contractor can now enter an ACN and if the lookup finds nothing it will then allow them to enter an ABN. A search is then performed on this to check the entity type and if not under a trust they are unable to continue. If it notes the entity is a trust and registered for GST they can continue. This is working but I think this is a problem because from what I have researched, a trust doesn't need to have an ACN? If anything they probably wouldn't usually? We have two contractors who were unable to register due to this problem and both of them do have an ACN with their trust but maybe that was just a coincidence?