Guidance

Corporation Tax technical specifications: CT600 appendices

Appendices for Corporation Tax Online software developers.

Documents

Appendix B: Marginal Rate Relief validation version 9.0a

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Appendix C: Annual Investment Allowance version 4.2a

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Details

Appendices for Marginal Rate Relief validation and Annual Investment Allowance.

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

Updates to this page

Published 1 January 2014
Last updated 17 May 2023 + show all updates
  1. Appendix C of the Annual Investment Allowance has been updated to version 4.2a.

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

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

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

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

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

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

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

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

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

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

  12. Appendix C Annual Investment Allowance version 3.2 has been published.

  13. First published.

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