Dros y pedair blynedd gyntaf, disgwylir i'r Awdurdod gasglu dros £1bn o refeniw trethi i gefnogi'r GIG, ysgolion a gwasanaethau cymdeithasol.
Over its first 4 years of operations, the WRA is forecast to collect more than £1 billion of tax revenue, supporting the NHS, schools and social services.