https://www.gov.uk/government/publications/self-assessment-self-employment-full-sa103f.cy
Hunanasesiad: Hunangyflogaeth (llawn) (SA103F) - GOV.UK
Defnyddiwch dudalennau atodol SA103F i gofrestru incwm hunangyflogedig ar eich Datganiad Treth SA100 os oedd eich trosiant blynyddol uwch na thraddodiad TAW ar...
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