Form

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.

Documents

Corporation Tax: Company Tax Return (CT600 (2018) Version 3)

This file may not be suitable for users of assistive technology. Request an accessible format.

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email different.format@hmrc.gsi.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Details

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 See Northern Ireland Corporation Tax regime: draft guidance for more information.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.

More information about How to complete a Company Tax Return is available, which includes a full list of companies that should use this form.

Check if you need to submit this form before downloading and sending it in the post.

Find out more about who must submit an online Company Tax Return.

Supplementary pages

CT600A (2015) Version 3: close company loans and arrangements to confer benefits on participators

CT600B (2015) Version 3: controlled foreign companies and foreign permanent establishment exemptions

CT600C (2018) Version 3: group and consortium relief

CT600D (2015) Version 3: insurance

CT600E (2015) Version 3: Charities and Community Amateur Sport Clubs (CASCs)

CT600F (2015) Version 3: Tonnage Tax

CT600H (2015) Version 3: cross-border Royalties

CT600I (2015) Version 3: supplementary charge in respect of ring fence trades

CT600J (2015) Version 3: disclosure of tax avoidance schemes

CT600K (2017) Version 3: Restitution Tax

Use the Company Tax Return guide (CT600 Guide (2018) Version 3) to help you complete form CT600 (2018) Company Tax Return.

Use the Budget changes (CT600 Budget Insert) for an overview of the main Budget changes affecting Corporation Tax.

Use form 64-8: authorise your agent to authorise HMRC to communicate with an accountant, tax agent or adviser acting on your behalf.

Published 7 April 2015
Last updated 6 April 2018 + show all updates
  1. Corporation Tax: Company Tax Return (CT600 (2018) Version 3) has been added.
  2. English version of the October 2017 Company Tax Return (CT600 version 3) has been added.
  3. The Company Tax Return (CT600 version 3) has been updated to incorporate the reform of Corporation Tax loss relief.
  4. New version Corporation Tax: Company Tax Return (CT600 (2017) Version 3) has been added.
  5. First published.