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Calculate tax, interest, penalties and Class 4 National Insurance contributions for the tax years ended 5 April 2011 to 5 April 2021

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

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Tax, interest and penalty calculator for the tax years ending 5 April 2011 to 5 April 2021

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

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Published 9 April 2019
Last updated 6 April 2022 + show all updates
  1. Guidance and form updated for 2021 to 2022 tax year.

  2. Guidance updated for 2020 to 2021 tax year.

  3. The calculator has been added for working out Income Tax, Class 4 National Insurance contributions, interest and penalties for tax years ended 5 April 2009 to 5 April 2019.

  4. Due to changes in the Bank of England base interest rate, we are currently updating our interest calculators to reflect the changes. Until this is completed you can either calculate interest manually or wait until new calculators are updated.

  5. First published.