Here is what happened Mitt took adavantage of the IRS offshore amnesty deal. He can't let that shit get out, since it would mean he fessed up to committing fraud.
that's a possibility..a good one..
but I can't imaging him voluntarily paying all the back taxes and penalties.. he's be better off to just leave the money overseas..
I'll say this tho.. whatever it is he's done, it's a hell of alot worse than the heat he's taking for not releasing them.