At the start of 2020-21, the additional percentage was an additional 3% on the main residential rates, although this was increased to 4% on 22 December 2020.
Ar ddechrau 2020-21, roedd y ganran ychwanegol yn 3% ychwanegol ar y prif gyfraddau preswyl, er y cynyddwyd hyn i 4% ar 22 Rhagfyr 2020.