The acronym ‘GST’ gets thrown around a lot, and is generally tied up with another acronym – the ‘BAS’. From a tax and compliance angle, GST is one of the big things you’ve got to get right – if you stuff it up, the ATO can turn around and ask you to pay more tax – in the form of additional GST payments. So what exactly is GST? and when do you need to start charging customers GST?