Permanent increase to penalty interest rates
The new tax year saw a change to the way interest on late paid taxes is calculated. What’s changed and what are the new charges?

Prior to 2025/26, interest was charged at the Bank of England base rate plus 2.5% on most underpaid taxes. In a push for unpaid tax bills to be settled, it was announced at the 2024 Autumn Budget that this would change to the base rate plus 4% from 6 April 2025. The government says the rate of late payment interest encourages prompt payment and ensures fairness for those who pay their tax on time.
From 6 April 2025 the following rates apply:
- Late corporation tax paid quarterly - 7%
- Late payment interest on other taxes - 8.5%
There is no corresponding change to the way repayment interest rates are calculated, i.e. the base rate minus 1%, with a lower limit of 0.5%.
Related Topics
-
Change to IHT on pensions proposals
HMRC has published a policy statement announcing an important change to its plans to include pension savings in an individual's estate for inheritance tax (IHT) purposes. What’s the full story?
-
Increase the IHT-free part of your estate by 50%
Your father died leaving his entire estate to your mother who later remarried. You’ll inherit some or all of her estate depending on whether she dies before her husband. What steps can be taken to reduce the inheritance tax (IHT) on the estate?
-
Class 2 NI problems to continue beyond summer
The problems with incorrectly charged Class 2 NI have been widely reported. HMRC has just released an update, and it’s bad news for affected individuals. What’s the full story?