Interest rate for Time to Pay arrangement

Hi Admin, When I sign up for a Time to Pay to pay my self assessment bill by installments, what is the interest rate charge on the oustanding balance? Does HMRC use the official interest (2.5%) or the late payment interest rate for income tax (7.75%)? Thanks. https://www.gov.uk/government/publications/rates-and-allowances-beneficial-loan-arrangements-hmrc-official-rates/beneficial-loan-arrangements-hmrc-official-rates https://www.gov.uk/government/publications/rates-and-allowances-hmrc-interest-rates-for-late-and-early-payments/rates-and-allowances-hmrc-interest-rates

Hi KY Wong,
It would be the late payment interest rate:
HMRC interest rates for late and early payments
Thank you.