Behind each concluded case is considerable work where the WRA have developed new policies and investigated and tested powers for this new area of the tax.
Y tu ôl i bob achos sydd wedi’i gwblhau mae gwaith sylweddol lle mae Awdurdod Cyllid Cymru wedi datblygu polisïau newydd ac wedi ymchwilio a phrofi pwerau ar gyfer y maes newydd hwn o'r dreth.