HMRC has announced that interest rates for late payments will increase by 1.5% for all taxes starting 6 April 2025. This change, which was first announced at Autumn Budget 2024, will raise the late payment interest from the current base rate plus 2.5% to base rate plus 4.00%. This adjustment applies to most taxes. Late payment interest is automatically applied by HMRC and accrues on any unpaid tax liability from the due date until the amount is fully paid.

HMRC interest rates are determined by legislation and are tied to the Bank of England’s base rate. While the rate for late payments is set to increase, the rate for repayment interest will remain unchanged. Currently, repayment interest is set at base rate minus 1%, with a minimum floor of 0.5%.

The purpose of the late payment interest rate increase is to encourage timely tax payments, ensuring fairness for those who pay on time. HMRC also says that this increase aligns its practices with those of other tax authorities globally, as well as with commercial norms for loan and overdraft interest rates. The repayment interest rate compensates taxpayers fairly for any overpayments.