>> irs takes identity theft very seriously and we're working to stop it. >> reporter: the agency has now installed computer filters to flag suspicious returns. still -- >> are you getting a lot of calls like this today? >> yes, we are. it's been really bad this year. >> reporter: there's no easy fix. i and other potential victims of this fraud first have to file a form, an affidavit with the irs to prove who we are. then it's likely to take months to resolve. lisa stark, abc news, washington. >> taking advantage of the dead. that's so twisted. and high-profile people who file for an extension include mitt romney and new jersey governor chris christie. so just fun facts. we'll be back in a moment. stay with us. >> announcer: abc's "world news now" will continue after this from our abc stations. welcome back, everybody. there's some delicate surgery