I am a contractor to a private practice (psychology). I get 70% of what the client pays to the practice and the practice takes 30% for admin fees. The practice also takes 10% of that 30% for GST which means my total is reduced to 67%. I do not charge GST and majority of clients don't pay it for the private services as it is a health service. I have been advised that I would get the GST back at the end of the tax year.
I have no understanding of why or how this works. can anyone explain to me why the practice can take 3% out of my 70% for GST.