HMRC update: tax, interest and penalty calculators

23 December 2022

HM Revenue and Customs (HMRC) has now updated the GOV.UK guidance to work out the tax, interests and penalties.

HMRC Calculators for Tax Interest & Penalties

Below are the calculators updated:

  • form to work out interest and penalties for tax years ended 5 April 2003 to 5 April 2021

  • form to work out income tax, interest, penalties and Class 4 National Insurance contributions for tax years ended 5 April 2011 to 5 April 2021.

HMRC Online Support Also Available 

The forms are interactive and you must have access to Adobe Reader to complete them. However if the forms do not open, then you can contact the HMRC online services helpdesks for support.


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