Will substitutes are arrangements that pass property on death outside the terms of a will and outside the formal requirements for making a will. The expression is descriptive rather than a defined statutory term in the UK or Ireland, but is widely used in private client practice and academic commentary.Typical will substitutes include nominations (for example, in pension schemes or certain credit union accounts), joint tenancies/right of survivorship, life assurance written in trust, payable‑on‑death clauses in some investment products, and lifetime trusts where the settlor retains benefits until death. These mechanisms take effect by survivorship, contract or trust law rather than succession law, and generally do not form part of the deceased’s probate estate (or, in Scotland, estate for confirmation), though they may still be relevant for inheritance tax or legal rights/forced heirship claims.Usage is broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland, but practitioners must consider jurisdiction‑specific rules on matrimonial property, clawback, legal rights in Scotland and section 117 Succession Act 1965 in Ireland, as well as financial provision on divorce or death. Will substitutes are central to estate planning, probate risk management and contentious succession work.