Mae Cynllun Corfforaethol ACC yn disgrifio’r egwyddorion sy'n sail i’w berthynas â threthdalwyr a rhanddeiliaid pwysig eraill er mwyn datblygu ffordd o weinyddu treth yng Nghymru.
The WRA’s Corporate Plan describes the principles which underpin its relationship with taxpayers and other important stakeholders to develop a Welsh way of administering tax.