This caused figures for Scottish, Welsh and rest of UK non-savings non-dividend (NSND) income tax data to be overstated by roughly 1% in each historic year.
Achosodd hyn i ffigurau ar gyfer data treth incwm yr Alban, Cymru a gweddill y DU nad yw'n deillio o gynilion na difidendau (NSND) gael eu gorbwysleisio gan oddeutu 1% ym mhob blwyddyn hanesyddol.