Estimate your penalty for late Self Assessment tax returns and payments

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

This calculator can only give an estimate of what you owe and does not take account of:

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

Do not use the calculator if you:

  • got your request to fill in a Self Assessment less than 3 months before the deadline, so had more time to file it
  • sent a paper return after 31 October, but HMRC agreed you had a reasonable excuse to not file online

If your 2018 to 2019 tax return is more than 3 months late, your calculation may be wrong. This is because daily penalties are not being charged for the 2018 to 2019 tax year, because of coronavirus (COVID-19).

You’ll still be charged £100 for missing the deadline, as well as further penalties if your tax return is more than 6 months late.

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