๐ Beneficiary and heir are not synonyms, and the difference decides who gets what. Under the Uniform Probate Code, "heirs" are "those persons, including the surviving spouse, who are entitled under the statutes of intestate succession to the property of a decedent" โ that is, the people state law picks when there is no instrument. A devisee is "any person designated in a will to receive a devise". A beneficiary of a beneficiary designation takes under a form on file with a custodian. So an heir is determined by statute and a beneficiary by a document, and the categories overlap only by coincidence. A child disinherited by a will is still an heir and takes nothing; a friend named on a life insurance policy is a beneficiary and is no relation at all. In everyday speech people call all of them beneficiaries, which is fine until a lawyer asks which one you mean.
A trust beneficiary's position is the most varied of the lot. The Uniform Trust Code defines a beneficiary as a person with "a present or future beneficial interest in a trust, vested or contingent", or who holds a power of appointment over trust property in a capacity other than trustee. Several things follow. An interest can be future, so a grandchild who will take in twenty years is a beneficiary today. It can be contingent on an event that may never happen. And it can be discretionary, meaning the trustee decides whether to distribute anything at all, in which case the beneficiary has an enforceable interest in the trustee's proper exercise of that discretion and no entitlement to any particular dollar. A trust holding $300,000 for a discretionary beneficiary does not owe them $300,000, or any part of it, on a date certain. Trust codes distinguish a current beneficiary, meaning a present distributee or permissible distributee, from the wider class, because reporting duties often run to the current group.
The rights are informational before they are financial. Under the Uniform Trust Code a trustee "shall keep the qualified beneficiaries of the trust reasonably informed about the administration of the trust and of the material facts necessary for them to protect their interests", must promptly furnish a copy of the trust instrument on request, must notify qualified beneficiaries within 60 days of accepting the trusteeship, and ๐ must notify them within 60 days of learning that a formerly revocable trust has become irrevocable, including by the settlor's death. That last duty is how many people first learn they are a beneficiary of anything.
๐ด Several of the most common uses of the word are about living people, not inheritance. A Medicare beneficiary is someone currently enrolled in Medicare; nobody has died. A 529 plan's designated beneficiary is, by Internal Revenue Code section 529(e)(1), the individual designated as the beneficiary of the amounts paid to the program, meaning the student the account is for. An ABLE account's designated beneficiary is the eligible individual with a disability for whose qualified disability expenses the account exists, and who generally owns it. In employee benefits law, "participants and beneficiaries" is standard vocabulary for everyone with a claim under a plan. And in the retirement account rules, designated beneficiary is a technical status with its own eligibility test, which is a fifth thing again. None of these are loose usages; each is a term of art in its own statute, which is precisely why reading across from one to another produces confident errors.
Naming somebody is the easy part. Whether a designation actually works depends on things the form does not ask about: whether a contingent beneficiary was named, whether a minor can receive directly, whether a spouse's consent was required, what the document means by the distribution language on it, and whether the form was ever updated after a divorce, a birth or a death. Each of those has its own page, and each is a more common cause of failure than choosing the wrong person.