Drwy edrych ar yr achosion o 2018-19 sydd wedi'u had-dalu ers hynny, rydym wedi gallu modelu effaith pontio o fewn y data a gyhoeddwyd gennym ar gyfer 2019-20. Gall person adhawlio’r dreth cyfradd uwch os yw'n cael gwared ar ei brif breswylfa flaenorol o fewn 3 blynedd i'r dyddiad y mae'n caffael ei brif breswylfa newydd, ond bydd y rhan fwyaf yn digwydd o fewn ond bydd y rhan fwyaf yn digwydd o fewn y flwyddyn gyntaf neu’r ail flwyddyn.2. Gwahanu data cwmnïau
By looking at the cases from 2018-19 that have been refunded since, we have been able to model the effect of bridging within the data we published for 2019-20. A person can reclaim the higher rates tax if they dispose of their former main residence within 3 years of the date they acquire their new main residence, but most will occur within the first or second years.2. Breaking out company data