mcare_pta_premium_share = if(agi <= mcare_pta_thresh1(year), mcare_pta_base(year), if(agi <= mcare_pta_thresh2(year), mcare_pta_bracket2(year), if(agi <= mcare_pta_thresh3(year), mcare_pta_bracket3(year), if(agi <= mcare_pta_thresh4(year), mcare_pta_bracket4(year), mcare_pta_bracket5(year)) ) ) )
mcare_pta_drop_percent = 0.10