Definition
The portion disponible is the share of a person's estate that French law permits to be freely disposed of — by gift, bequest, or other transfer — to persons other than forced heirs. It is defined by subtraction: the total estate minus the réserve héréditaire (the protected share legally owed to forced heirs) equals the portion disponible. The size of the freely disposable share shrinks as the number of legitimate children increases:
- One legitimate child: the transferor may freely dispose of one-half of the estate.
- Two legitimate children: one-third may be freely disposed of.
- Three or more legitimate children: one-fourth may be freely disposed of.
The restriction applies regardless of how the transfer is structured — whether by will (testament) or by inter vivos gift made during the transferor's lifetime.
Common Confusion
The portion disponible is easily confused with its complement, the réserve héréditaire (or legitime). The réserve is the protected share that forced heirs receive as a matter of law and that cannot be defeated by testamentary or inter vivos disposition. The portion disponible is what remains after that protected share is carved out. Researchers working in Louisiana civil law sources or French legal materials sometimes encounter both terms in close proximity; confusing them inverts the meaning. A transferor controls the portion disponible; the forced heirs control the réserve.
Why It Matters in Research
This term appears primarily in materials touching French civil law and its American offshoot, Louisiana succession law. Researchers consulting 19th-century American legal dictionaries on this term should understand that the definitions provided reflect the French Civil Code framework as received and reported by American legal authors — not necessarily the precise statutory text of Louisiana law, which developed its own forced heirship rules and has amended them significantly over time.
Several research traps exist. First, the fractional formulas stated in the historical dictionaries (one-half, one-third, one-fourth) track the French Civil Code as it stood in the 19th century. French law on reserved shares has been modified since, and Louisiana's forced heirship regime underwent major legislative revision in 1989 and 1995, narrowing the class of forced heirs considerably. A researcher relying on Black's or Bouvier's for the controlling fractions in a Louisiana succession dispute must verify the applicable law for the relevant time period.
Second, the term crosses between private international law and domestic succession law. Estate planning and conflict-of-laws materials addressing French or Francophone estates will use portion disponible as a technical term of art; the same concept may appear in English-language materials as "disposable portion," "freely disposable share," or "disponible portion" — all referring to the same idea but not always used with precision.
Third, the interaction between inter vivos gifts and testamentary dispositions is critical. Because both count against the portion disponible, researchers analyzing historical estate disputes must aggregate lifetime transfers and bequests to determine whether the disposable share was exceeded — a process called rapport in French succession law.
Historical Dictionary Support
The four historical sources are in close agreement. Black's (both editions), Rapalje & Lawrence, and Bouvier's reproduce substantially identical definitions, all stating the same fractional rules for one, two, and three or more legitimate children, and all confirming that the restriction applies equally to inter vivos dispositions and testamentary transfers. The uniformity suggests the American legal dictionaries were drawing from a common secondary source — likely a 19th-century American treatise on French or civil law — rather than consulting the French Civil Code directly. Rapalje & Lawrence attributes the formulation to "Brown," an apparent reference to a treatise, though the citation is unspecific.
Notably, none of the historical sources define the complementary term réserve héréditaire in the same entry, though Bouvier's cross-references "LEGITIME," which is the closest common-law analogue and the term most frequently used in Louisiana succession law for the protected share. This cross-reference is the most useful navigational signal in the historical sources. Researchers should follow it: the legitime entry will often provide the forced heirship framework that gives portion disponible its operative meaning.
The historical sources also do not address collation, rapport, or the mechanics of clawback when a disposition exceeds the portion disponible — doctrines essential to understanding how the rule functions in practice. For those, researchers must go beyond the dictionary shelf to civil law treatises or Louisiana statutory commentary.
Jurisdictional Note
In the United States, this term has direct legal relevance only in Louisiana, which inherited the French civil law tradition of forced heirship. Louisiana's forced heirship rules have been substantially modified by legislation, most significantly in the 1990s, and the modern Louisiana Civil Code provisions on forced heirship and the disposable portion do not map precisely onto the 19th-century French formulas described in the historical dictionaries. Outside Louisiana, the term appears in American legal materials primarily in conflict-of-laws contexts involving estates with French or civil law connections.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Forced Heirship; Louisiana Succession Law; Civil Law Tradition in American Jurisdictions.