Published 31 August 2012
Last updated 25 February 2022
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25 February 2022
The CC/FS1a privacy notice information has been updated.
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5 October 2020
The ‘Compliance checks this factsheet relates to’ section has been updated.
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8 November 2019
The‘Compliance checks that this factsheet relates to’ section has been updated.
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18 March 2019
This factsheet has been updated throughout and highlights HMRC support available for customers needing help.
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4 September 2018
The factsheet has been updated to explain HMRC’s use of open source research.
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23 January 2018
The factsheet has an updated ‘More information’ section that explains what information HMRC may use when dealing with compliance checks.
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15 December 2017
This factsheet has been updated to include new legislation about when a penalty is restricted because of the timing of the disclosure.
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3 November 2015
New helpsheet published.
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12 November 2014
Updated version of Compliance Factsheet 1a
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31 August 2012
First published.
