Get an estimate of how much you’ll need to pay in penalties and interest if you’ve missed the deadline for:

  • sending your Self Assessment tax return
  • paying your Self Assessment tax bill

You can only calculate penalties for the current tax year.

This calculator doesn’t take account of any:

  • partial payments or penalty payments you’ve made towards your tax bill
  • outstanding interest or penalties for previous tax years
  • credit you have from previous tax years

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