Where people tried to evade or avoid paying the full amount, we identified these cases and took steps to ensure that the right tax was paid to protect revenue.
Lle ceisiodd pobl efadu neu osgoi talu'r swm llawn, rydym wedi nodi'r achosion hyn ac wedi cymryd camau i sicrhau bod y dreth gywir yn cael ei thalu er mwyn diogelu refeniw.