In my country  no tax on Bitcoin pay because it is a legal tender currency of two countries, if you pay in euro or usd or chf you also do not pay tax

btcs

Lack of knowledge when I started stacking.    That's true for me and 99 % of others that buy btc. 

nemo

I'd love to spend bitcoin and use it as my only currency, but using it creates a taxable event.   this is a huge hurdle and I think this is the main reason why more isn't using it en everyday life