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
-
HMRC has withdrawn Form 652. How should you notify VAT errors going forward?
-
Can paying interest to your company save tax?
You recently borrowed a substantial sum of money from your company rather than take extra salary or dividends. Your bookkeeper says it might be more tax efficient if your company charged you interest. This sounds counter-intuitive but is it correct?
-
Reverse charge and end user rules: opportunity?
If you sell construction services to other builders, you need to consider the domestic reverse charge rules. You must apply these where your customer is an end user. How might this create a cash-flow advantage?