It also provides the framework for inter-Government work at Ministerial and official level to oversee the establishment and operation of the Welsh Income Tax powers.
Mae hefyd yn rhoi’r fframwaith ar gyfer gwaith rhynglywodraethol ar lefel weinidogol a swyddogol er mwyn goruchwylio’r broses o sefydlu a gweithredu pwerau treth incwm Cymru.