Credyd Treth Plant a Chredyd Treth Gwaith: Pam fod gordaliadau’n codi
Defnyddiwch arweiniad WTC8 i gael cyngor ac enghreifftiau o sut y gall gordaliadau o gredydau treth godi.
Dogfennau
Manylion
Os ydych yn gordalu credydau treth, efallai y byddwch yn gofyn pam mae hyn wedi digwydd.
Mae’r arweiniad hwn yn dangos rhai o’r rhesymau mwyaf cyffredin sy’n esbonio pam y mae pobl yn cael eu gordalu.
Updates to this page
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The guidance has been updated for the 2025 to 2026 tax year.
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Annual tax year changes to English and Welsh WTC8.
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Annual tax year changes to English and Welsh WTC8.
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Annual tax year changes to English and Welsh WTC8.
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Annual tax year changes to English and Welsh WTC8.
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Annual Tax year changes update
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Annual tax year changes to the WTC8 and Welsh version available
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The 2015 to 2016 form has been added to this page.
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First published.