You quote a price, complete the work and receive payment. Everything looks settled until you realise GST was not accounted for correctly. Now the amount you expected to keep may be smaller, and the records you thought were complete need another look. GST confusion can start with an everyday transaction and carry through to your BAS. When you are busy serving customers, it is easy to... https://cleanslate.net.au/insights/blogs/how-much-is-gst-in-australia/