Definition
Jus accrescendi (also rendered jus accrescendi) is the right of survivorship — the legal principle by which, upon the death of one co-owner, that owner's share automatically passes to the surviving co-owner or co-owners by operation of law, rather than descending to the deceased's heirs or passing under a will.
The right operates as an incident of joint tenancy: each joint tenant holds an undivided interest in the whole, and when one joint tenant dies, the surviving joint tenants absorb the deceased's share. No probate, conveyance, or affirmative act is required. The share does not enter the decedent's estate at all — it simply accrues to the survivors.
The doctrine finds its classical expression in two maxims preserved in Black's:
Jus accrescendi inter mercatores, pro beneficio commercii, locum non habet — "The right of survivorship has no place between merchants, for the benefit of commerce." This reflects the longstanding rule that partnership property does not carry the right of survivorship. A deceased partner's interest passes to that partner's estate, not to the surviving partners.
Jus accrescendi præfertur oneribus — "The right of survivorship is preferred to encumbrances." The accruing share passes to survivors free of the decedent's personal encumbrances, reflecting the priority of the survivorship mechanism over claims that attach only to the decedent's interest.
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Common Language
This is pure legal Latin with no counterpart in ordinary English. The COMMON LANGUAGE section does not apply.
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Common Confusion
Jus accrescendi is frequently conflated with inheritance or intestate succession. The critical distinction: survivorship operates outside the estate entirely, while inheritance describes the transmission of property through the estate. A joint tenant cannot devise their interest by will precisely because jus accrescendi defeats testamentary disposition — the share accrues to survivors before the will can operate. Researchers encountering disputes over whether a decedent's share passed by survivorship or by will should treat these as mutually exclusive mechanisms, not competing claims of the same type.
The doctrine is also sometimes confused with the right of accrual in legacy law, where a lapsed bequest accrues to remaining beneficiaries. The mechanics are analogous but the legal context is distinct.
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Core Elements
For jus accrescendi to operate in a joint tenancy, the classical common law required the presence of four unities:
1. Unity of time — all joint tenants acquired their interest at the same moment
2. Unity of title — all acquired through the same instrument
3. Unity of possession — all hold an undivided right to the whole
4. Unity of interest — all hold interests of the same type and duration
Severance of any of these unities converts the joint tenancy into a tenancy in common, destroying jus accrescendi as to the severing tenant's share.
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Why It Matters in Research
The merchant exception (inter mercatores) is essential for any researcher working with partnership law, commercial co-ownership, or business succession in historical sources. The maxim encodes a fundamental divergence: joint tenancy law and partnership law follow opposite rules on survivorship, and conflating them produces serious analytical errors. In early American sources, the boundary between commercial co-ownership and genuine joint tenancy was not always cleanly drawn. Check how a given source characterizes the relationship before assuming which survivorship rule applies.
The præfertur oneribus maxim matters in property research involving creditors of a deceased joint tenant. Because the accruing share passes outside the estate, creditors who attached only the decedent's interest — rather than the joint tenancy itself — may find themselves without recourse against the surviving tenants. Historical equity courts navigated this tension differently across periods, and the result in a given case often turned on whether the attachment or encumbrance was made before or after the survivorship event.
Modern statutes in many American jurisdictions have modified or abolished jus accrescendi for certain co-ownership forms, particularly in the context of marital property and tenancy by the entirety. Researchers working across time periods should not assume the common law rule persisted unchanged into twentieth-century sources.
The Latin form of the term is universal in historical sources through the nineteenth century; modern legal writing often substitutes "right of survivorship" entirely. When searching historical indexes, use the Latin.
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Historical Dictionary Support
Black's Law Dictionary preserves the two primary maxims in their classical form and provides sound cross-references to Story's Equity Jurisprudence, Story's Law of Partnership, Co. Litt. 182a, and Broom's Legal Maxims — the core treatise sources for understanding how these rules were applied in equity and at common law. The merchant exception entry in Black's cites Story, Partn. § 90 directly for the proposition that there is no survivorship in partnership, which is the authoritative American treatise statement of the rule.
What historical dictionaries including Black's do not fully address: the modern statutory displacement of jus accrescendi, the treatment of joint bank accounts (a significant twentieth-century battleground for survivorship law), and the interplay between jus accrescendi and modern non-probate transfer mechanisms such as payable-on-death designations. These gaps mean researchers should treat dictionary sources as establishing the common law baseline and look to statutory and case law for departures.
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Jurisdictional Note
Most American states have retained joint tenancy with right of survivorship as an available form of co-ownership, but many require an express declaration in the conveyancing instrument — contra the older common law presumption in favor of joint tenancy. Some states have abolished joint tenancy altogether, replacing it with tenancy in common as the default. The merchant exception survives as a background principle of partnership law in virtually all U.S. jurisdictions, now codified in uniform partnership act provisions governing a deceased partner's interest.
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Encyclopedia Cross-Reference
Law Mind Encyclopedia — Joint Tenancy
Law Mind Encyclopedia — Survivorship
Law Mind Encyclopedia — Partnership Property
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