This Q&A assumes that the intention is that the proposed disclaimer should fall within section 142 of the Inheritance Tax Act 1984 (IHTA 1984). On a variation or a disclaimer by a beneficiary of the beneficiary's entitlement under a Will or the intestacy rules, the beneficiary will be treated as never having been entitled for inheritance tax purposes, provided that the conditions in IHTA 1984, s 142 are met. IHTA 1984, s 142(1) provides: ‘142 Alteration of dispositions taking effect on death (1) Where within the period of two years after a person's death: (a) any of the dispositions (whether effected by will, under the law relating to intestacy or otherwise) of the property comprised in his estate immediately before his death are varied, or (b) the benefit conferred by any of those dispositions is disclaimed, by an instrument in writing made by the persons or any of the persons who benefit or would benefit under the dispositions,