washington u.s. president donald trump tax-cut plan generate growth nearly enough replace trillions dollars lose revenues rise deficits could even take back economic gain fiscal experts say wednesday core principles plan unveil wednesday rely heavily so-called dynamic score budget analysis method assume tax cut boost economic activity thus generate revenues assumptions heart republican tax orthodoxy since ronald reagan use justify massive tax cut 1981 deride time critics voodoo economics wednesday treasury secretary steven mnuchin say trump plan would pay growth close deductions credit detail release far maya macguineas head committee responsible federal budget crfb say plan could add trillion trillion federal deficit five years credible dynamic score go show bill pay macguineas say growth effect real important add decimals percentage point growth full percentage point budget watchdog group estimate pay plan u.s. growth would need sustain 4.5 percent annually level see sustain basis since late 1960s early 1970s mnuchin say expect plan boost sustain u.s. growth percent crfb estimate even level would require massive increase productivity rapidly retire baby-boom generation work high growth rat doug elmendorf former director congressional budget office one agencies provide cost estimate legislation say see little chance congress find politically acceptable offset pay plan rise borrow could work trump goals result increase deficit dampen effect economic activity offset least part stimulative effect low tax rat say elemendorf dean harvard university john f. kennedy school government high federal debt load crowd capital private use dampen economic activity long run elmendorf say republicans congress hop use budget procedural rule allow 51-vote threshold senate pass tax reform would limit cut 10 years plan create deficits years beyond first decade could also run afoul another procedural rule could require 60 vote senate tax cut expire decade could cause another u.s. fiscal crisis like one 2012 tax cut pass george w. bush expire trump administration propose permanent tax reform ten-year tax cut creation phenomenal fiscal cliff ever 2028 chris krueger political analyst cowen co washington say note clients trump u.s. tax plan manage pay growth experts