Yeah I agree it would be a lot of work. I was thinking that it could start with support for a few major countries and branch out from there. I bet there would be ways to monetise with premium features like Rotki. It is not exactly an idea I would excited to work on, but feels like something that is super important to get the circular economy happening. I want to get merchants accepting Bitcoin, but I also feel like I need to inform them of the tax burden involved. It would be great if it was recognised as legal tender everywhere instead, maybe the effort is best spent there?