Use form CT600 (2017) Version 3 to file a Company Tax Return for accounting periods starting on or after 1 April 2015.
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Use form CT600 (2017) Version 3 for any accounting periods starting on or after 1 April 2015. Companies with less straightforward tax affairs should use this form. Refer to the CT600 guide (2017) Version 3 for help and a full list of companies that should use this form.
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Related forms and guidance
Corporation Tax: Company Tax Return guide (CT600 Guide (2017) Version 3)
Use the CT600 Guide (2017) Version 3 to help you complete form CT600 (2017) Company Tax Return.
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Use CT600 Budget Insert for an overview of the main Budget changes affecting Corporation Tax.
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Use form 64-8 to authorise HM Revenue and Customs to communicate with an accountant, tax agent or adviser acting on your behalf.