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HMRC internal manual

Inheritance Tax Manual

From
HM Revenue & Customs
Updated
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Assessing: calculating interest: sales on IOP (WIR) cases

Once an asset is sold, the instalment option (IHTM30191) is lost on that asset. All the tax becomes due on the sold asset from the date of the sale. You should charge interest on the total balance from the day after the sale to the date of payment (or calculation).