Caiff y ddadl hon ei chynnal ar ôl i ddau Fil trethi gael eu pasio gan y Cynulliad Cenedlaethol - biliau sy’n paratoi’r ffordd at gyflwyno dwy dreth ddatganoledig ym mis Ebrill 2018 - sef y dreth trafodiadau tir sy’n disodli’r dreth stamp, a’r dreth gwarediadau tirlenwi sy’n disodli’r dreth dirlenwi.
The debate follows the passage of two tax Bills by the National Assembly for Wales, which pave the way for the introduction of two devolved taxes in April 2018 – land transaction tax, which replaces stamp duty land tax and landfill disposals tax, which replaces landfill tax.