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
-
VAT-saving opportunity with changes to the CGS?
The government has announced that it will increase the capital goods scheme (CGS) threshold for capital expenditure on land and buildings from its current level of £250,000. What will the new threshold be, and how can you take advantage?
-
Delay salary to save tax
As a company owner manager, you decide when to take income from your business. If that’s your only source of income, tax planning is relatively simple but it’s trickier if you have other sources. What’s the best strategy to improve tax efficiency?
-
Loan written off: are you in HMRC’s crosshairs?
HMRC is writing to directors that took a loan from their company that was later written off or released. What should you do if you receive a letter?