https://www.citizensadvice.org.uk/cymraeg/Tai/council-tax/applying-for-council-tax-reduction/
Gwneud Cais am Ostyngiad yn y Dreth Gyngor (CTR) - Cyngor ar Bopeth
Check how to apply to the council for Council Tax Reduction. Check if you can backdate the reduction, and how to challenge a decision.
y dreth gyngorgwneud cais