I'd be curious to know how they would enforce something like that. There are over 2000 crypto currencies at the moment and if you did a service for someone and they paid you in one of the 2000 cyptos how would we say that this is "income" rather than a trade or barter? I'm wondering which cryptos they would recognize or do they recognize all of them when you mention the word "income" then I would think you should also be able to pay their taxes in the said crypto currency. I guess the world is going to be watching to see what plan they come up with to pull these taxes off, nothing seems cut and dry.