One of the founding principles for the devolution of tax powers is to enable the Welsh Government to set taxes which better meet the needs and priorities of its citizens and taxpayers.
Un o egwyddorion sefydlol datganoli pwerau trethi yw galluogi Llywodraeth Cymru i osod trethi sy'n diwallu anghenion a blaenoriaethau ei dinasyddion a’i threthdalwyr yn well.