Am y tro cyntaf, caiff pobl sydd wedi cael diagnosis o nam meddyliol difrifol ac sy’n bodloni’r meini prawf cymhwysedd eu trin yn gyson ledled Cymru er mwyn sicrhau eu bod yn cael yr un cymorth a gostyngiadau lle bynnag y maent yn byw. Byddant hefyd yn gallu hawlio'n ôl unrhyw ostyngiadau treth gyngor hyd at yr adeg pan gawsant y diagnosis.
For the first time, people who have received a severely mentally impaired (SMI) diagnosis and meet the eligibility criteria will be treated consistently throughout Wales to ensure they receive the same support and discounts no matter where they live. They will also be able to claim back any council tax discounts, to the point when they were diagnosed.