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
-
Flat rate scheme: join now or never?
HMRC recently published a report about the advantages and disadvantages of the flat rate scheme for a small business. Could the report lead to the abolition of the scheme or a ban on new users?
-
Accelerate tax relief for the cost of equipment
You’re upgrading your company’s IT equipment as it’s now several years old. Naturally your company will get tax relief for the purchases but what’s the tax position if you sell or scrap the old equipment, and how might you improve it?
-
Opt out of winter fuel payments by 15 September
HMRC has issued new guidance on the winter fuel payments. What do you need to know?