The taxpayer may reject corrections made by the WRA by notifying the WRA within 3 months of the correction being issued, or by amending the tax return within 12 months of the filing date.
Gall y trethdalwr wrthod cywiriadau sydd wedi’u gwneud gan ACC drwy roi gwybod i ACC o fewn tri mis i ddyroddi’r cywiriad, neu drwy ddiwygio’r ffurflen dreth o fewn 12 mis i’r dyddiad ffeilio.