Guidance

How to complete a Company Tax Return

Use this guide to help you complete form CT600 (2018) version 3.

Documents

How to complete a Company Tax Return

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Details

This guide will help you complete the Company Tax Return CT600 (2018) version 3. You should read all the general notes and use the box-by-box advice when you’re completing the form.

Published 7 April 2015
Last updated 15 May 2018 + show all updates
  1. The guide has been updated to clarify parts of the CT600 form.
  2. New CT600 guide (2018) version 3 added.
  3. CT600 guide (2017) has been updated to include the new loss reform rules that apply for periods ending on or after 1 April 2017.
  4. New CT600 guide (2017) version 3 added.
  5. CT600_Guide_V3. replaced by CT600_Guide _V0.1
  6. First published.