. in 2013 , the internal revenue service ( 201cirs 201d ) finalized its examination of schering-plough 2019s 2007-2009 tax years . the company 2019s unrecognized tax benefits for the years under examination exceeded the adjustments related to this examination period and therefore the company recorded a net $ 165 million tax provision benefit in 2013 . in 2010 , the irs finalized its examination of schering-plough 2019s 2003-2006 tax years