Bitcoins itself could not be taxed because it is not regulated by central banks,it is a virtual currency working on its own. Unlike fiat money which is governed by the rules in the central banks and government, but even though its is not taxable, the way we spend our earnings is already being taxed. Like buying goods and services, taxes are already imposed in everything we pay.
That is incorrect. Bitcoin in the U.S. is and has always been taxable. ALL GAINS IN VALUE ARE TAXABLE. It has absolutely nothing to do with central banks. Please look to a real source of information and stop reading the stupidity of Internet posts by 15 year olds who have never had to deal with capitol gains before.
Here is a definitive source:
www.irs.gov/newsroom/irs-virtual-currency-guidance