2015 vs . 2014 on a gaap basis , the effective tax rate was 24.0% ( 24.0 % ) and 27.1% ( 27.1 % ) in 2015 and 2014 , respectively . the effective tax rate was higher in fiscal year 2014 primarily due to the goodwill impairment charge of $ 305.2 , which was not deductible for tax purposes , and the chilean tax reform enacted in september 2014 which increased income tax expense by $ 20.6 . these impacts were partially offset by an income tax benefit of $ 51