Every year at this time, Donald Rumsfeld writes a letter to the IRS with the same complaint: how can he know what he doesn't know?
"The tax code is so complex and the forms are so complicated, that I know I cannot have any confidence that I know what is being requested and therefore I cannot and do not know, and I suspect a great many Americans cannot know, whether or not their tax returns are accurate," Rumsfeld wrote. ...BusinessInsider
I suspect he gets that one right. He doesn't know. None of us knows. When we get that audit notice, it's probably the only clear communication we'll ever get from the IRS, thanks to the muddy tax code created by our beloved Congress.