washington small number u.s. tax finance business professionals expect president donald trump 15-percent corporate tax rate become reality part tax reform accord deloitte tax llp survey release tuesday poll 3,100 people offer glimpse private-sector expectations tax reform less optimistic public statements trump administration officials lawmakers trump fellow republicans push get corporate income tax rate 35 percent 15-20 percent say would drive u.s. economic growth competitiveness come years half poll participants view low corporate rate main economic driver tax reform nearly 40 percent predict rate would end 25 percent due political budgetary challenge face tax reform thirty-one percent survey professional service firm july 18 deloitte webcast expect corporate tax rate 20 percent 5.3 percent believe trump 15 percent rate would become law republicans pledge enact sweep tax overhaul since reagan era year-end ambitious white house timeline call legislation unveil september vote house representatives senate end november still 74 percent survey doubtful confident comprehensive tax reform bill would enact 2017. less 19 percent confident somewhat confident would happen year 63 percent believe compromise necessary ingredient congress succeed tax reform quality prove elusive republican lawmakers far year trump leadership public support sense economic crisis see essential less 10 percent participants respectively term growth 16 percent identify tax code simplification feature likely boost economy international tax reform accelerate expense manufacture equipment draw support single digits expect trump 's 15-percent corporate tax rate deloitte survey