The first of these self-assessments must take place by 1 April 2026, and biennially thereafter, with a review each intermediate year (that is beginning on 1 April 2027 and biennially thereafter).
Rhaid cwblhau'r hunanasesiad cyntaf erbyn 1 Ebrill 2026, a phob dwy flynedd wedyn, a chyflwyno adolygiad rhwng y blynyddoedd hyn (hynny yw'n dechrau ar 1 Ebrill 2027 a phob dwy flynedd wedyn).