Established by the Welsh Government, the WRA started collecting and managing revenue from two devolved Welsh taxes, Land Transaction Tax and Landfill Tax, in April 2018.
Dechreuodd ACC, a sefydlwyd gan Lywodraeth Cymru, gasglu a rheoli refeniw o ddwy dreth ddatganoledig yng Nghymru, y Dreth Trafodiadau Tir a'r Dreth Tirlenwi, ym mis Ebrill 2018.