They probably just sent you a letter asking you to pay it with a smidgen of interest and that was that, right? Probably hardly worth doing extra work to be super thorough unless it was a large amount.
ya, it was stupid, the interest was about $300 or something. I would have paid the original amount but I just screwed up and mis-placed the 1099. It was a gotchya game. I think this could be why people hate taxes so much, of course we all hate taxes but the way you do it matters IMO.