HMRC Tax, interest and penalty calculator

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If you are only entitled to basic personal allowances and your tax affairs are relatively straightforward, use this income tax, interest and penalty calculator on the HMRC website to work out your Income tax, Class 4 National Insurance contributions, and any interest and penalties due for tax years ended 5 April 2009 to 5 April 2018 inclusive.

HMRC Income Tax, interest and penalty calculator >>

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