Brad Plumer's got a very strong post poking holes n the supposed magic of "The Flat Tax". Read it. And remember this -- there's nothing complicated about taxation. You make X dollars a year, you multiply that by the percentage you should pay, and you mail off a check. See? Easy as pie. It's not paying taxes -- getting exemptions and credits and deductions and so forth -- that's complicated. So when Republicans begin advocating for flat taxation, call it what it is: an assault on the progressivity of the system. They don't want taxes to be easier, they want them lower on the rich and higher on the poor. This debate isn't about simple taxation, it's about simple fairness.