Following the Welsh Government and UK Government agreement of the Anglesey Freeport Outline Business Case, both governments laid legislation to designate their proposed tax sites.
Yn dilyn cytundeb Llywodraeth Cymru a Llywodraeth y DU ar Achos Busnes Amlinellol Porthladd Rhydd Ynys Môn, gosododd y ddwy lywodraeth ddeddfwriaeth i ddynodi eu safleoedd treth arfaethedig.