I don't have to do that. All I do, is pay 2.1744% tax (per year) on all Bitcoin I own. You have no idea how lucky you are, I'd gladly exchange for a capital gains tax with additional paperwork.
The worst thing about Bitcoin that can happen with authorities, is not having a clear - transparent system to know what happens with your holdings. For instance, if you own X amount of satoshis and the capital gains you have is an amount of Y euros, you don't know what happens with the taxes. Must you pay taxes on the X satoshis that you own? And if so, how much? Or must you pay taxes on the capital gains? And if so, again, how much? This is a pain in the ... especially if the authorities suddenly decide in the future to apply taxes and they catch you unprepared. They will treat you like a criminal for not paying taxes in the past, even though legislation doesn't currently exist.