The ATO has just issued a ruling on the GST treatment of Bitcoin. Here: http://law.ato.gov.au/atolaw/view.htm?docid=%22GST%2FGSTR20143%2FNAT%2FATO%2F00001%22 In brief: 1. A transfer of bitcoin is a "supply" for GST purposes. 2. Bitcoin is not "money" under the GST...