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Corporation Tax: supplementary charge in respect of ring fence trades (CT600I (2015) version 3)

Use supplementary pages CT600I (2015) version 3 if your company carried on a ring fence trade for any period beginning on (or deemed to have begun on) 17 April 2002.

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Use these supplementary pages if your company carried on a ring fence trade (generally, oil extraction or exploitation of rights in the UK or UK Continental Shelf), for any period beginning on (or deemed to have begun) 17 April 2002.

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 (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.

How to complete a Company Tax Return
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.

Published 7 April 2015
Last updated 25 April 2018 + show all updates
  1. Welsh version of form CT600I (2015) version 3 has been added.
  2. First published.