01/09/2026
Failing to notify HMRC is not the same as submitting a tax return late.
A “failure to notify” happens when you do not tell HMRC that a new tax liability has arisen. For example, when:
• Your business exceeds the VAT registration threshold
• Your company becomes liable for Corporation Tax
• You start receiving taxable income from self-employment or investments
The penalty is calculated as a percentage of the unpaid tax. The maximum can be:
• 30% for a non-deliberate failure
• 70% for a deliberate failure
• 100% if the failure was deliberate and concealed
The final penalty also depends on whether you contacted HMRC voluntarily, how quickly you acted and how much you cooperated. An unprompted disclosure can result in a significantly lower penalty.
If you had a reasonable excuse, HMRC may not charge a penalty, provided you notify them promptly once the circumstances preventing you from doing so have ended.
Ion Partners Accountant can review your situation, calculate the outstanding tax and help you make a complete disclosure to HMRC.
📞 01227 636720
📧 [email protected]
📍 128 High Street, Herne Bay, CT6 5JY