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Guidance

Corporation Tax generic technical specifications

Find guidance for software developers working with the Corporation Tax online service.

Updates to this page

From:
HM Revenue & Customs
Published:
29 May 2012
Last updated:
13 June 2025
Show all updates

  1. Removed attachment 'Corporation Tax recognition instructions 2023' and replaced with 'Corporation Tax recognition instructions: 1.0'.

  2. Corporation Tax online service validation rules 1.16a guidance has been replaced with version 1.17a because the error message for errors 1611 and 3317 has been updated.

  3. Corporation Tax recognition instructions 2023 has been added.

  4. The ‘Corporation Tax online service validation rules 1.15a’ guidance has been replaced with version 1.16a because the condition row for error 9043 has been updated. For V2 submissions — check that box 64 agrees with the result of the computation of marginal starting rate or small companies’ relief. For V3 submissions — check that box 435 agrees with the result of the computation of marginal relief.

  5. The ‘Corporation Tax online service validation rules 1.14’ guidance has been replaced with a more accessible 'Corporation Tax online service validation rules: 1.15a' version.

  6. 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.

  7. Corporation Tax online service validation rules' version 1.13 has been replaced with version 1.14 to reflect changes to error messages.

  8. How to test services: 1.4 has been updated.

  9. The 'Corporation Tax online service validation rules' version 1.12 has been replaced with version 1.13.

  10. How to test services: 1.3 is updated to version 1.4.

  11. Corporation Tax online service validation rules 1.12 updated to include error code 3321.

  12. Corporation Tax online service validation rules updated to version 1.12 - March 2015

  13. First published.

Documents

Transaction Engine: Support for software developers

https://www.gov.uk/government/collections/government-gateway-support-for-software-developers

How to use the test service: 1.4a

ODT, 38 KB

This file is in an OpenDocument format

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HMRC (IR) mark: support for software developers

https://www.gov.uk/government/collections/hmrcirmark-support-for-software-developers

Corporation Tax online service guidance: 1.6

PDF, 81.7 KB, 16 pages

This file may not be suitable for users of assistive technology.

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Corporation Tax online service validation rules: 1.17a

ODT, 46.5 KB

This file is in an OpenDocument format

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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.

Corporation Tax recognition instructions: 1.0

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Technical specifications for Corporation Tax online services for software developers.

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