Updated: Welsh translation added
Use these supplementary pages if your company has been involved in Overseas Life Assurance Business.
Please check if you’re required to submit this form online before downloading it and sending it in the post.
Find out more about who must submit an online Company Tax Return.
Related forms and guidance
Corporation Tax: Company Tax Return (CT600 (2018) version 3)
Use form CT600 (2018) version 3 to file a Company Tax Return for accounting periods starting on or after 1 April 2015.
Corporation Tax: Company Tax Return guide
Use the CT600 Guide (2018) version 3 to help you complete form CT600 (2018) 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.