Where such tax (or any part of it) has not been paid within a period of six months of the date on which it became payable, recovery of the unpaid amount is possible from other persons.
Os nad yw treth o’r fath (neu unrhyw ran ohoni) wedi’i thalu o fewn cyfnod o chwe mis i’r dyddiad y daeth yn daladwy, mae posib adennill y swm heb ei dalu gan bersonau eraill.