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Calculate tax, interest, penalties and Class 4 National Insurance contributions for the tax years ended 5 April 2010 to 5 April 2020

Use this form to work out income tax, Class 4 National Insurance contributions, interest and penalties for tax years ended 5 April 2010 to 5 April 2020

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Tax, interest and penalty calculator for the tax years ending 5 April 2010 to 5 April 2020

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Details

Use this form if your tax affairs are straightforward and you are only entitled to basic personal allowances. You’ll be able to complete and save this form. Refer to the section ‘Before you start’ for further information.

Before you start

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Published 9 April 2019
Last updated 6 April 2021 + show all updates
  1. Guidance updated for 2020 to 2021 tax year.

  2. 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.

  3. 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.

  4. First published.