Corporation Tax technical specifications: CT600 appendices
Appendices for Corporation Tax Online software developers.
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Appendices for Marginal Rate Relief validation and Annual Investment Allowance.
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Rates, allowances and limits for Corporation Tax
Find rates, allowances and limits for Corporation Tax.
Updates to this page
Last updated 17 May 2023 + show all updates
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Appendix C of the Annual Investment Allowance has been updated to version 4.2a.
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Appendix C of the Annual Investment Allowance has been updated to version 4.1a.
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'Appendix B: Marginal Rate Relief validation version 8’ has been replaced with ‘Appendix B: Marginal Rate Relief validation version 9.0a’.
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Appendix C of the Annual Investment Allowance has been updated to version 3.9.
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Appendix C of the Annual Investment Allowance has been updated with version 3.8.
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Appendix C of the Annual Investment Allowance has been updated with version 3.7.
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Appendix C of the Annual Investment Allowance has been updated with version 3.6.
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Appendix A removed and replaced with a link to Corporation Tax rates.
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Appendix C of the Annual Investment Allowance has been updated with version 3.3.
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Appendix A: rates of tax version 2.5 has been published.
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Appendix A and Appendix B have been updated to include Corporation Tax rates/fractions from April 2015.
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Appendix C Annual Investment Allowance version 3.2 has been published.
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First published.