Apparently if i sell bitcoin then I pay some capital gains. If I bought $1000 of bitcoin once a month day for two years and then I sold $10,000 of bitcoin. Then I am not sure how do you figure out capital gains tax because I bought bitcoin at different times when the price was always fluctuating. If bitcoin went up a lot then maybe I owe based on some average or maybe you could owe a lot because it went up a lot ?