The gentleman on the phone informed me that I owed $4k in back taxes, but was unable to give me any detailed information. He asked what the balance of my checking and savings accounts were. When I informed him I would not be giving him any personal information, he threatened me with force, and told me "There is a warrant out for your arrest, and within 30 minutes of ending the call, the police will show up at your residence to arrest you". I reminded me that he had none of my personal information, he got angry and eventually hung up.
I called my bank immediately, and they informed me that the IRS deals primarily with written mail, and to never give out information to a scam like this.