If you have been diagnosed as SMI by a doctor and you live with 2 or more adults who are eligible to pay council tax there will be no reduction.​
Os ydych wedi cael diagnosis o NMD gan feddyg a'ch bod yn byw gyda 2 neu fwy o oedolion sy'n gymwys i dalu’r Dreth Gyngor, ni fydd unrhyw ostyngiad.