Referrals Program

Actually i not understand about referrals program, let say that my referrals get my earning that i supposed to get from my referrals is $1. $1 will be added to my next payment right. But for next month, the clicks and earning from referrals are continuosly counted and not reset. So, how to know earning that i supposed to get from my referrals on the next month. Let say, it shown up $1.80, Do i get a) $0.80 for next payment or b)$1.80. If a) i think you should show that amount instead of $1.80 because i'm confuse.