Guidance

Compliance checks: penalties for not telling HMRC about an under-assessment — CC/FS7b

This factsheet tells you about the penalties HMRC may charge if there has been an under-assessment and you have not told us about it within 30 days.

• From: HM Revenue & Customs
• Published: 31 August 2012
• Last updated: 25 February 2022
  Show all updates

  1. 25 February 2022

     Information about asking someone else to deal with HMRC on your behalf, your rights when we're considering penalties and if you're not happy with our services has been updated.

  2. 17 December 2017

     This factsheet has been updated to include new legislation about when a penalty is restricted because of the timing of the disclosure.

  3. 3 November 2015

     New factsheet has been published.

  4. 31 August 2012

     First published.

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Penalties for not telling us about an under-assessment — CC/FS7b

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Factsheets are for guidance only and reflect HMRC’s position at the time of writing.