Where such tax (or any part of it) has not been paid within a period of 6 months of the date on which it became payable, recovery of the unpaid amount is possible from other persons.
Pan na thelir treth o'r fath (neu unrhyw ran ohoni) o fewn cyfnod o 6 mis i'r dyddiad y daeth y dreth yn daladwy, mae modd adennill y swm na thalwyd gan bobl eraill.