If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email firstname.lastname@example.org.
Please tell us what format you need. It will help us if you say what assistive technology you use.
Use form CT600 (2018) Version 3 for accounting periods starting on or after 1 April 2015.
This form has been updated in readiness for when a Northern Ireland (NI) Executive together with the UK Government decide to introduce a devolved rate. See Northern Ireland Corporation Tax regime: draft guidance for more information. Entries must not be made in any of the NI boxes until a NI rate has been introduced.