The Australian Treasury has recently introduced the Treasury Laws Amendment (2017 Measures No. 6) Bill 2017, which alters the GST treatment of digital currency. In an effort to promote more international commerce business in Australia, the proposed bill removes the GST obligations from digital currency effectively putting such currency on even footing with any other physical currency in circulation.
More information about the proposed Amendment can be found here, including a link to the bill as well as, an explanatory memorandum. The bill is currently before the House of Representative, and if passed will take retro-active effect from July 1, 2017 on all sales and purchases of digital currency.