Established by the Welsh Government, the WRA started collecting and managing revenue from 2 devolved Welsh taxes, Land Transaction Tax and Landfill Disposals Tax, in April 2018.
Dechreuodd ACC, a sefydlwyd gan Lywodraeth Cymru, gasglu a rheoli refeniw o 2 dreth ddatganoledig yng Nghymru, Treth Trafodiadau Tir a Threth Gwarediadau Tirlenwi , ym mis Ebrill 2018.