Corporation Tax generic technical specifications
Find guidance for software developers working with the Corporation Tax online service.
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Technical specifications for Corporation Tax online services for software developers.
Last updated 23 November 2022 + show all updates
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The 'How to use the test service: 1.4' guidance has been replaced with a more accessible 'How to use the test service: 1.4a' version.
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Corporation Tax online service validation rules' version 1.13 has been replaced with version 1.14 to reflect changes to error messages.
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How to test services: 1.4 has been updated.
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The 'Corporation Tax online service validation rules' version 1.12 has been replaced with version 1.13.
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How to test services: 1.3 is updated to version 1.4.
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Corporation Tax online service validation rules 1.12 updated to include error code 3321.
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Corporation Tax online service validation rules updated to version 1.12 - March 2015
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First published.