A question if you will. How does it work in the US? One must declare the bitcoins that he holds, or just declare the income when converting them to dollars?
Here in 'merica you would only have to claim your income you made from selling Bitcoins, the Bitcoins you're holding are completely worthless in the eyes of the IRS, they can't tax it. Which is why it is a good thing to pay for things using bitcoins.