Published 29 May 2012
Last updated 23 November 2022
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23 November 2022
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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20 April 2020
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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8 July 2019
How to test services: 1.4 has been updated.
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28 August 2018
The ‘Corporation Tax online service validation rules’ version 1.12 has been replaced with version 1.13.
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16 January 2018
How to test services: 1.3 is updated to version 1.4.
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4 January 2018
Corporation Tax online service validation rules 1.12 updated to include error code 3321.
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24 March 2015
Corporation Tax online service validation rules updated to version 1.12 – March 2015
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29 May 2012
First published.
