Interest on Pension Tax Refund

Hi Background: I am non-UK tax resident. I will be doing a full pension drawdown in one transaction. There is no tax due on the pension drawdown in the UK under the double tax treaty. I know that an emergency tax code will be applied, therefore I will need to do a tax reclaim. The tax reclaim will be large. I understand that for claims above GBP100K that the reclaim can not be done via the DT Individual form alone, instead I will be asked to complete a Self Assessment tax return. I will do the draw down early in 24/25. I will submit the tax return promptly after April 2025. Lets assume, best case, it will take one year before the tax refund will be made, even though the DT Individual will have established that no tax was due. Does HMRC pay interest under this scenario? What date would the interest run from and what is the current interest rate under the above scenario? Many thanks

Hi Pines12345,
No interest will not be applied until after the 24/25 due date which is 31 January 2026.
Interest will only be payable from 1 February 2026.
Thank you,