Depends on what the meaning of "hide" is
It looks like Paul Ryan let the cat out of the bag:
As we all know, Romney has parked a boatload of money in the Cayman's although they claim it's not personal, it's strictly business. Not that it matters. Either way, it saves the Romney fortune a fortune.
But yeah, one way or the other, he's hiding money from the IRS. And there was a time when Paul Ryan pretended to be against it.
But I'd be willing to bet one of Mitt's millions that he doesn't actually give a damn.