Mae trethi Cymru yn cynnwys y dreth gyngor ac ardrethi annomestig, yn ogystal â chyfraddau treth incwm Cymru o fis Ebrill 2019. Defnyddir y cyllid a godir drwy’r trethi i ariannu gwasanaethau cyhoeddus yng Nghymru - o ysbytai ac ysgolion, i wella  ffyrdd a phontydd.
The money raised from the Welsh taxes – which includes council tax and non-domestic rates and, from April 2019, Welsh rates of income tax – funds Welsh public services, from our hospitals and schools to improvements to roads and bridges.