IHTM09701 | Valuation: introduction
From HM Revenue & Customs · Inheritance Tax Manual
Inheritance tax is charged by reference to the value transferred by a chargeable transfer (IHTM04021). The way that we go about valuing assets is therefore fundamental to the charge. The general rule is that the value of any asset is its ‘open market value’ (IHTM09703). However, some specific assets (IHTM09702) need special attention and the IHT legislation, as interpreted by case law, contains other rules that tell you
how to value assets when there are restrictions on the freedom to dispose (IHTM09771) of property.