Treth Gorfforaeth ar gyfer Ffurflen Dreth y Cwmni (CT600 (2025) Fersiwn 3)
Defnyddiwch y ffurflen hon ar gyfer cyfnodau cyfrifyddu sy鈥檔 dechrau ar neu ar 么l 1 Ebrill 2015.
Dogfennau
Manylion
Defnyddiwch ffurflen CT600 (2025) Fersiwn 3 ar gyfer cyfnodau cyfrifyddu sy鈥檔 dechrau ar neu ar 么l 1 Ebrill 2015.
Mae鈥檙 ffurflen hon wedi鈥檌 diweddaru鈥檔 barod ar gyfer pryd y bydd Gweithrediaeth Gogledd Iwerddon, ynghyd 芒 llywodraeth y DU, yn penderfynu cyflwyno cyfradd ddatganoledig. Ewch i Gyfundrefn Treth Gorfforaeth Gogledd Iwerddon: arweiniad drafft (yn agor tudalen Saesneg) i gael rhagor o wybodaeth. Ni ddylid gwneud ceisiadau yn unrhyw un o flychau Gogledd Iwerddon nes bod cyfradd Gogledd Iwerddon wedi鈥檌 chyflwyno.
Mae rhagor o wybodaeth am Sut i lenwi Ffurflen Dreth y Cwmni (yn agor tudalen Saesneg) ar gael, sy鈥檔 cynnwys rhestr lawn o gwmn茂au a ddylai ddefnyddio鈥檙 ffurflen hon.
Gwiriwch p鈥檜n a oes angen i chi gyflwyno鈥檙 ffurflen hon cyn ei lawrlwytho a鈥檌 hanfon drwy鈥檙 post.
Tudalennau atodol
CT600C (2018) Fersiwn 3: rhyddhad gr诺p a chonsortiwm.
CT600D (2015) Fersiwn 3: yswiriant
CT600E (2015) Fersiwn 3: Clybiau Chwaraeon Amatur Cymunedol (CChAC) (CASCs)
CT600F (2025) Fersiwn 3: Treth Dunelledd
CT600H (2015) Fersiwn 3: breindaliadau trawsffiniol
CT600I (2019) Fersiwn 3: t芒l atodol mewn perthynas 芒 masnachau wedi鈥檜 diogelu.
CT600J (2015) Fersiwn 3: datgelu cynlluniau arbed treth
CT600K (2017) Fersiwn 3: Treth Iawndal
CT600L (2025) Fersiwn 3: Treth Gorfforaeth: ymchwil a datblygu
CT600M (2024) Fersiwn 3: Porthladdoedd Rhydd a Pharthau Buddsoddi
CT600N (2023) fersiwn 3: Treth Datblygwyr Eiddo Preswyl
Ffurflenni ac arweiniad cysylltiedig
Defnyddiwch canllaw Ffurflen Dreth y Cwmni (Canllaw CT600 (2025) Fersiwn 3) i鈥檆h helpu chi i lenwi ffurflen CT600 (2025) Ffurflen Dreth y Cwmni.
Defnyddiwch y Gyllideb yr Hydref 2024 鈥� trosolwg o ddeddfwriaeth dreth a chyfraddau (OOTLAR) (yn agor tudalen Saesneg) i gael trosolwg o鈥檙 newidiadau pennaf yn y Gyllideb sy鈥檔 effeithio ar Dreth Gorfforaeth.
Defnyddiwch ffurflen 64-8: awdurdodi鈥檆h asiant i awdurdodi CThEF i gyfathrebu 芒 chyfrifydd, asiant treth neu gynghorydd sy鈥檔 gweithredu ar eich rhan.
Updates to this page
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English and Welsh versions of Corporation Tax for Company Tax Return (CT600 (2025) Version 3) have been added.
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English and Welsh versions of Corporation Tax for Company Tax Return (CT600 (2024) Version 3) have been added.
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English and Welsh versions of Corporation Tax: Company Tax Return (CT600 (2023) Version 3) have been added.
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Added translation
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Corporation Tax: research and development (CT600L (2022) version 3) has been added.
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Corporation Tax: research and development (CT600L (2021) version 3) has been added.
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The Corporation Tax for Company Tax Return (CT600 (2021) Version 3) has been added.
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English and Welsh versions of the Corporation Tax for Company Tax Return (CT600 (2020) Version 3) have been updated.
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Welsh version of Corporation Tax for Company Tax Return (CT600 (2019) Version 3) has been updated.
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English and Welsh versions of Corporation Tax: Company Tax Return (CT600 (2019) Version 3) have been added.
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Corporation Tax: Company Tax Return (CT600 (2018) Version 3) has been added.
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English version of the October 2017 Company Tax Return (CT600 version 3) has been added.
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The Company Tax Return (CT600 version 3) has been updated to incorporate the reform of Corporation Tax loss relief.
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New version Corporation Tax: Company Tax Return (CT600 (2017) Version 3) has been added.
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First published.