Overall, this package seems to tell us what we already know: Mitt Romney makes a huge amount of money, most of it in capital income. My salary, and probably yours, is a rounding error on his tax return. Some accountant is making a lot of money of of him. And as Ezra Klein points out, he didn’t even have a job in 2011.
I was expecting to end this by saying that he doesn’t go out of his way to pay extra taxes, but it turns out, he actually did. (Though not, I think, because the US government is actually his favorite charity.) So I’ll instead end by saying that in an ideal world, neither the tax code nor Mitt Romney’s tax return would look exactly like this one does now. But as far as I can tell after wading through it, in the world we actually live in, his tax planning seems to be entirely unremarkable and completely within the law.