Estimate your penalty for late self assessment tax returns and payments 

Get an estimate of how much you will need to pay in penalties and interest if you have 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 have 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 three months before the deadline, so had more time to file it 
• sent a paper return after October 31, but HMRC agreed you had a reasonable excuse to not file online