On 3 April 2023, our postal address changed to: Welsh Revenue Authority, PO Box 108, Merthyr Tydfil, CF47 7DL.
Ar 3 Ebrill 2023, newidiodd ein cyfeiriad post i: Awdurdod Cyllid Cymru, Blwch Postio 108, Merthyr Tudful, CF47 7DL.