Guidance

Corporation Tax technical specifications: CT600 appendices

Appendices for Corporation Tax Online software developers.

• From: HM Revenue & Customs
• Published: 1 January 2014
• Last updated: 17 May 2023
  Show all updates

  1. 17 May 2023

     Appendix C of the Annual Investment Allowance has been updated to version 4.2a.

  2. 17 March 2023

     Appendix C of the Annual Investment Allowance has been updated to version 4.1a.

  3. 28 February 2023

     'Appendix B: Marginal Rate Relief validation version 8’ has been replaced with ‘Appendix B: Marginal Rate Relief validation version 9.0a’.

  4. 7 September 2022

     Appendix C of the Annual Investment Allowance has been updated to version 3.9.

  5. 4 March 2021

     Appendix C of the Annual Investment Allowance has been updated with version 3.8.

  6. 19 March 2019

     Appendix C of the Annual Investment Allowance has been updated with version 3.7.

  7. 4 February 2019

     Appendix C of the Annual Investment Allowance has been updated with version 3.6.

  8. 3 January 2019

     Appendix A removed and replaced with a link to Corporation Tax rates.

  9. 12 October 2015

     Appendix C of the Annual Investment Allowance has been updated with version 3.3.

  10. 3 June 2015

      Appendix A: rates of tax version 2.5 has been published.

  11. 27 April 2015

      Appendix A and Appendix B have been updated to include Corporation Tax rates/fractions from April 2015.

  12. 13 April 2015

      Appendix C Annual Investment Allowance version 3.2 has been published.

  13. 1 January 2014

      First published.

Documents

Appendix B: Marginal Rate Relief validation version 9.0a

ODT, 100 KB

This file is in an OpenDocument format

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.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Appendix C: Annual Investment Allowance version 4.2a

ODT, 51.6 KB

This file is in an OpenDocument format

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.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Details

Appendices for Marginal Rate Relief validation and Annual Investment Allowance.

Related guidance

Rates, allowances and limits for Corporation Tax
Find rates, allowances and limits for Corporation Tax.