Inheritance law assumes one foundational event: the death of the testator. Without it, probate cannot open, assets cannot be distributed, and the entire mechanism of estate administration sits in a waiting room of indefinite duration.
For immortal beings, this creates an estate planning challenge that conventional advisors are not trained for. The client is motivated, financially sophisticated, and categorically unwilling to provide a death date, which eliminates the primary trigger in the standard planning framework.
A living trust offers the best structural workaround. Unlike a will, a living trust does not require probate and can be administered by a trustee during the settlor's lifetime, however long that turns out to be. The immortal settlor retains control, beneficiaries receive distributions according to trust terms, and the absence of a death certificate never becomes operationally relevant.
Beneficiary management across infinite timescales creates secondary problems. Beneficiaries die, families evolve, and the specific humans named in a trust instrument drafted in 1340 are unlikely to be the appropriate recipients of distributions in 2026. The trust therefore needs a dynamic beneficiary framework that updates across generations without requiring a new document every century.
Asset valuation is complicated by the fact that an immortal being's portfolio has had an indefinite accumulation period. Some assets will have appreciated beyond current market reference points, some will have depreciated into historical curiosity, and some will be legally unclear because the jurisdictions that originally granted title no longer exist.
Tax exposure across multiple centuries produces a compliance burden that no single accounting firm has a standardized model for. Capital gains, estate taxes, and wealth levies all assume a conventional human lifecycle, and each assumption breaks in a slightly different way when applied to an immortal client.
Succession planning for family businesses is particularly complex when the founder never leaves. Children, grandchildren, and subsequent generations may inherit management roles while the immortal original retains ultimate ownership, which creates governance tensions that corporate law is not designed to resolve permanently.
The will as a document still has value even for immortal clients, primarily as a record of current intentions and a planning anchor that can be updated as circumstances change across eras. An immortal should draft and revise their will approximately every fifty years or following any major geopolitical reorganization that affects asset jurisdiction.
Forced heirship rules in civil law jurisdictions present a unique pressure point. If national law requires a minimum share of an estate to pass to direct descendants, and the estate never opens because the testator continues to exist, the forced heirship mechanism has no trigger event to activate.
The most practical estate plan for an immortal being therefore combines a living trust with regularly updated beneficiary schedules, a clear asset custodian for each jurisdictional cluster, a long-term tax advisory relationship with a firm that accepts multi-century engagement letters, and an honest conversation about what the endgame looks like when there may not be one.