Taxes contradict the reason why btc was invented. A quickbooks to do taxing would not go well. But perhaps a daily, weekly, monthly, yearly budget planner any currency & then sats. People could add their expenses vs income, tax with option to lookup a state & city taxes to auto apply them in the planning. A lot of people don't know all their city & state taxes. I think that would be cool to lay out the expenses show how much you got left then layout the leftover for buying sats & spending habits.