My accountant is consistently reminding me that it’s better for me to use an agency like Contractright or CXC for any sub contractors I use, just to make the transaction more contractor-like. Perhaps you have other agencies you’d recommend.
I was very happy to find this tax office tool employee-contractor decision tool. It helps you determine whether subbies are really contractors or just employees. You can answer the questions online then print it off to show you’ve made the decision properly. And if you have employees, try these useful ATO information pages for employers