Published 7 April 2015
Last updated 3 September 2021 + show all updates
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The guide to help you complete form CT600 (2021) version 3 has been updated.
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New CT600 guide (2021) version 3 has been added.
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Updated for 2021.
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The guidance has been updated with information about Capital Allowances and the Non-Resident Landlords scheme to make things clearer for software developers and their customers.
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New CT600 guide (2020) version 3 has been added.
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Guide changed to link to the new Finance Act where needed.
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New CT600 guide (2019) version 3 added.
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The guidance has been updated with information about restitution tax for boxes 170 and K20.
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The guidance for Loss Reform and Corporate Interest Restriction (CIR) to help companies file their Company Tax Return has been updated.
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The guidance has been updated with information relating to the number of 51% companies and clarification of the supplementary charge rate.
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The PDF has been updated to correct parts of the CT600 guide (2018).
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The guide has been updated to clarify parts of the CT600 form.
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New CT600 guide (2018) version 3 added.
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CT600 guide (2017) has been updated to include the new loss reform rules that apply for periods ending on or after 1 April 2017.
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New CT600 guide (2017) version 3 added.
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CT600_Guide_V3. replaced by CT600_Guide _V0.1
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First published.
