Updated: New version Corporation Tax: Company Tax Return (CT600 (2017) Version 3) has been added.
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. Please refer to the CT600 guide (2015) Version 3 for help and a full list of companies that should use this form.
Please check if you are required to submit this form before downloading and sending it in the post.
Related forms and guidance
Corporation Tax: Company Tax Return guide (CT600 Guide (2015) Version 3)
Use the CT600 Guide (2015) Version 3 to help you complete form CT600 (2015) Company Tax Return.
Corporation Tax: Budget changes (CT600 Budget Insert)
Use CT600 Budget Insert for an overview of the main Budget changes affecting Corporation Tax.
64-8: authorise your agent
Use form 64-8 to authorise HM Revenue and Customs to communicate with an accountant, tax agent or adviser acting on your behalf.