Former U.S. Secretary of Defense, Donald Rumsfeld once said, “There are knowns; there are things we know that we know. There are known unknowns; that is to say there are things that, we now know we don’t know. But there are also unknown unknowns – there are things we do not know, we don’t know.” No better words could describe the current state of affairs with regard to our tax laws. So here are key knowns and unknowns…