Use these pages if both:
- your company held an interest of 25% in a foreign company controlled from the UK at any time in this accounting period
- the accounting period of the controlled foreign company ended within, or ended at the same time as, your company’s accounting period
Please check if you’re required to submit this form online before downloading and sending it in the post.
Find out more about who must submit an online Company Tax Return.
Corporation Tax: Company Tax Return (CT600 (2017) version 3)
Use form CT600 (2017) 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 (2017) version 3 to help you complete form CT600 (2017) 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.