The tax fight has strengthened. http://fortune.com/2017/09/07/cryptocurrency-bitcoin-tax/

It is clear that some method has to be found to tax earnings, but expecting people to keep track of all their purchases and sales of cryptocurrency is very problematic.

Remember, all cryptocurrency is purchased from post-tax dollars in the first place. And it is very risky.

Only when very significant returns are involved should taxes kick in. Alternatively, the standard GST will capture all purchases and sales of real commodities.