O 1 Ebrill 2018, bydd y Dreth Trafodiadau Tir a'r Dreth Gwarediadau Tirlenwi yn disodli Treth Dir y Dreth Stamp a'r Dreth Dirlenwi.
From 1 April 2018 Stamp Duty Land Tax and Landfill Tax will be replaced by Land Transaction Tax and Landfill Disposals Tax in Wales.