The Land Transaction Tax and Anti-avoidance of Devolved Taxes (Wales) Act 2017 (LTTA) and LTT are kept under review by the Welsh Government.
Caiff Deddf Treth Trafodiadau Tir a Gwrthweithio Osgoi Trethi Datganoledig (Cymru) 2017 (DTTT) a TTT eu hadolygu'n barhaus gan Lywodraeth Cymru.