HMRC will recharge the Welsh Government for any net additional costs wholly and necessarily incurred as a result of the administration of the Welsh Income Tax powers.
Bydd CThEF yn ailgodi tâl ar Lywodraeth Cymru am unrhyw gostau ychwanegol net yr eir iddynt yn gyfan gwbl ac o anghenraid o ganlyniad i weinyddu pwerau treth incwm Cymru.