A billing authority can make, vary, or revoke a determination made under sections 12A and 12B of the 1992 Act, but only before the beginning of the financial year to which the determination applies.
Gall awdurdod bilio wneud, amrywio, neu ddirymu penderfyniad a wnaed o dan adrannau 12A a 12B o Ddeddf 1992, ond dim ond cyn dechrau'r flwyddyn ariannol y mae'r penderfyniad yn berthnasol iddi.