Huffington Post:  Tax Expert Calvin Johnson 'Skeptical' Of Mitt Romney's Taxes:

A respected tax attorney and deficit hawk wrote a letter to the editor of Tax Notes on Monday saying that, "There is good reason to be skeptical" of Mitt Romney's claim to have paid all the taxes he legally owes.

The letter, by University of Texas Law School Professor Calvin Johnson, focuses on two trusts Romney has set up: one for his children, which is worth over $100 million, and an $87 million retirement trust. These trusts have grown at an enormous rate — Johnson notes that they have been more than 10 times as profitable as Warren Buffett's investments over the same time frame. Johnson writes that Romney may have played fast and loose with the law by undervaluing Bain Capital assets that were contributed to the trusts. By undervaluing the assets, Romney could avoid paying gift taxes.

(Hat Tip: Marty McMahon.)