Definite Scam .. I.R.S. does not call  or email people. (check out the officiaal IRS website) If they need to get in touch with you, You will recieve a letter in the mail with document # on it so you can go to the IRS web site and look up what the letter is about and verify if is an official government document..  These bozo's have been calling me for the past 2 years and actually at one point a live person left a message that they were Sargent Bob and a Marshal would be coming to my home to arrest me if I did not return their call.. Wish I had picked up, I would have told them to send them a.s.a.p!! I need a vacation from my family!!