Corporation Tax: Company Tax Return guide

Use this guide to help you complete form CT600 (2017) version 3.


CT600 version 3 guide


This guide will help you complete the Company Tax Return CT600 (2017) 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 11 December 2017 + show all updates
  1. CT600 guide (2017) has been updated to include the new loss reform rules that apply for periods ending on or after 1 April 2017.
  2. New CT600 guide (2017) version 3 added.
  3. CT600_Guide_V3. replaced by CT600_Guide _V0.1
  4. First published.