GP price increase imminent 28/09/2023 FacebookTwitterEmail AMA (SA) President and Port Lincoln general practitioner Dr John Williams is hoping for an extension on the deadline to register for amnesty on the new tax. PHOTO: THE INVESTIGATOR CLINIC. Charlotte Martin South Australian medical practices are liable to pay payroll tax on payments made to contracted GPs which could equate to […] Subscribe or Login to see the rest of the content. Username Password Remember Me Forgot Password