The tax recovery profile over time is complicated by the fact that the profiles given focus might differ in terms of how hard it’s to make a case for applying the higher tax figure.
Mae'r proffil adennill treth dros amser yn cael ei gymhlethu gan y ffaith y gallai ffocws y proffiliau unigol amrywio o ran pa mor anodd yw hi i wneud achos am gymhwyso'r ffigur treth uwch.