Romney has said he was unemployed. He’s right. He actually does nothing to earn most of his income. He’s just in possession of a giant pile of cash. He pays some people to do stuff with that giant pile of cash so it earns a rate of return. And because we are ruled by horrible people who think the lives of the 1% are more important than everyone else, the tax rate on any money that pile of cash earns is much lower than it is on the money earned by people who actually work.
And while this is both inequitable and makes no sense in terms of “free market” economics, he would pay even less under his own plan.