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HMRC internal manual

Inheritance Tax Manual

HM Revenue & Customs
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Assessing: calculation principles: the tax calculation (settlement cases)

You can prepare some settlement calculations on COMPASS (IHTM31241), but the remainder must be calculated manually (IHTM31301).

The later instructions provide advice on calculations relating to

  • immediately chargeable transfers (IHTM31450)
  • principal, proportionate and flat rate charges (IHTM31460) in existing settlement cases, and
  • recapture charges (IHTM31491) when heritage property or timber is disposed of.