Fis Mawrth 2020, ysgrifennais at Ysgrifennydd Ariannol y Trysorlys, y Gwir Anrhydeddus Jesse Norman Aelod o Senedd y DU, i wneud cais ffurfiol i ddatganoli cymhwysedd trethu pellach i Senedd Cymru mewn perthynas â ‘threth ar dir gwag’. Roedd y cais ffurfiol hwn yn cyd-fynd â’r broses y cytunwyd arni rhwng Gweinidogion y DU a Gweinidogion Cymru ar gyfer datganoli pwerau trethu newydd i Gymru fel y darperir gan Ddeddf Cymru 2014. Hefyd, gwnaed y cais ar ôl cyfarfod adeiladol rhyngof i ac Ysgrifennydd Ariannol y Trysorlys ddiwedd mis Chwefror.
In March 2020, I wrote to the Financial Secretary to the Treasury, the Rt Hon Jesse Norman MP, to formally request devolution to Senedd Cymru of further tax competence relating to a ‘vacant land tax’. This formal request was in keeping with the process agreed between UK and Welsh Ministers for the devolution of new tax powers to Wales as provided by the Wales Act 2014, and followed a constructive meeting between myself and the Financial Secretary to the Treasury at the end of February.