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HMRC internal manual

Inheritance Tax Manual

IHTM30554 - Erroneous or excessive repayments of tax: interest supplement

Any repayment of tax or interest carries interest known as the ‘interest supplement’ (IHTM31665). When an interest supplement is erroneous or excessive if the error is made because of inaccurate information given by us on form Sect 6 (IHTM31641), these instructions apply.