This Q&A has assumed that: • the vulnerable person's trust to which the question refers meets the qualifying conditions for a disabled person's trust within sections 89, 89A, 89B and 89C of the Inheritance Tax Act 1984 (IHTA 1984) • the trustees of the discretionary Will trust exercise their power of appointment to create the disabled person's trust in a manner which meets the conditions in IHTA 1984, s 144 The legislation which determines whether, and to what extent, the residence nil rate band (RNRB) is available is set out in IHTA 1984, s 8D to 8M (inclusive). One of the conditions for an estate to be eligible for the RNRB is that a qualifying residential interest must be closely inherited—see IHTA 1984, s