This Practice Note explains the circumstances in which a reduced rate of inheritance tax (IHT) is available for estates where 10% or more of the estate is left to a charity or registered club, such that the remainder of the estate or relevant component is liable to IHT at the rate of 36% rather than 40%. It covers the calculations required to ascertain the value of the net estate for the purposes of qualifying for the reduced rate and includes an outline draft calculation. It also deals with the election to merge components and wider issues such as the interaction between the reduced rate and IHT reliefs including quick succession relief, agricultural property relief and business property relief.