Definition
Community property is a marital property regime under which most assets and debts acquired by either spouse during marriage are owned jointly and equally by both spouses as a unified marital estate. Upon divorce, each spouse is generally entitled to an equal share of community property. Upon death, a spouse may dispose of only their half by will; the other half passes according to applicable law or survivorship rights.
Community property is distinguished from the separate property of each spouse, which consists of assets owned before marriage and assets acquired during marriage by gift, inheritance, or devise. The separate character of property can be lost through commingling or transmutation.
The system derives from Spanish and French civil law traditions and operates today in nine U.S. states: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. Alaska offers an elective community property regime.
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Common Language
Modern common usage (Wiktionary): Property acquired during a marriage, excluding gifts and inheritances, owned jointly by both spouses and divided upon divorce, annulment, or death. Specifically, marital property divided equally in California and some other states, as opposed to equitable distribution in most states.
Historical common usage (Webster's 1913): Not defined as a distinct entry; "community" in Webster's 1913 carried its general sense of common ownership or shared interest among a group or locality.
The gap between common and legal usage is subtle but consequential. Common usage accurately captures the basic idea but tends to compress two analytically distinct questions: characterization (is this property community or separate?) and division (how is it apportioned at divorce or death?). Legally, the equal-division rule is a default, not an absolute — spouses may contract around it, and courts in some community property states have limited discretion to depart from strict equality. Researchers who take the Wiktionary gloss as definitive may miss the significant doctrinal complexity in characterization disputes, especially around commingling, transmutation, and the treatment of income from separate property.
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Recognized Forms
/SUBTYPES
Statutory community property: The default regime imposed by state law upon marriage, absent a contrary agreement.
Conventional (contractual) community property: Community property established or modified by prenuptial or postnuptial agreement. Bouvier's notes this distinction directly, identifying "conventional community" as that formed by express agreement in the marriage contract, contrasting it with the legal community that would otherwise arise by operation of law.
Quasi-community property: A doctrine in some states (notably California) treating property acquired in a non-community-property state as community property upon divorce or death, if it would have been community property had it been acquired in the forum state.
Community property with right of survivorship: A form available in several states that blends community property ownership with a survivorship mechanism, allowing the whole to pass automatically to the surviving spouse without probate.
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Why It Matters in Research
Jurisdictional scope is the first trap. Community property applies in nine states plus elective Alaska — the majority of U.S. jurisdictions are common-law equitable distribution states. Historical sources, particularly pre-twentieth-century treatises and dictionaries, often treat community property as an exotic civil law curiosity rather than a major property regime. Researchers working with nineteenth-century federal materials must remember that community property states were still developing their doctrine, and the federal government's treatment of community property income (deeply contested into the 1940s and resolved by statute in 1948) was a major policy battleground. The Law Mind Tax Encyclopedia entry at tax_17 is essential for any research touching federal income tax and community property.
Characterization is where most litigation happens. The definition of what counts as community versus separate property sounds clean in principle but generates substantial case law around: (1) income from separate property (some states treat it as community, some as separate); (2) property purchased with mixed funds; (3) transmutation by agreement or conduct; and (4) the effect of titling. Researchers using Black's or Bouvier's for a historical characterization question should verify against the specific state's statutes and cases, as the rules vary considerably.
The civil law genealogy matters for historical research. Community property in U.S. law descends through Spanish and French civil law, not English common law. Pre-statehood Spanish and Mexican law governs some early California and Texas property questions. Bouvier's entry reflects this lineage by framing community property as a species of civil law partnership. Researchers encountering disputes over land grants or pre-statehood marriages in the Southwest must engage sources outside the common law tradition entirely.
Federal tax treatment has its own complexity. Because federal law does not have a community property regime, spouses in community property states report income and hold property differently from spouses in common-law states. The split-income rules, basis rules, and step-up rules at death all operate distinctively. See tax_17 for navigation of that literature.
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Historical Dictionary Support
Black's Law Dictionary defines community property as property acquired by husband or wife, or either, during marriage, when not acquired as the separate property of either, quoting the California Civil Code. Black's extends the definition to encompass the civil law partnership concept: the community consists of profits of all effects of which the husband has administration and enjoyment, plus the produce of the reciprocal industry and labor of both spouses. This formulation reflects the classic civil law characterization of the marital community as a profit-sharing partnership, not merely a co-ownership arrangement — a framing that has doctrinal consequences for how income from separate property is treated.
Bouvier's approaches community property from the civil law side more explicitly, defining it under "community" as a species of partnership contracted at lawful marriage, and distinguishing conventional community (formed by express contract) from legal community (arising by operation of law). Bouvier's framing emphasizes the contractual and modifiable nature of the regime in a way that Black's abbreviated definition obscures.
Both dictionaries reflect their era's assumption that the husband holds administration of the marital estate — a feature of the historical regime that has been wholly abolished by modern statute and constitutional equal protection principles. Researchers using these historical definitions should treat the gendered administrative structure as a relic, not operative law.
Neither historical source addresses quasi-community property, community property with right of survivorship, or the federal tax dimensions — all of which are products of twentieth-century statutory development.
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Jurisdictional Note
Community property applies in Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin, plus elective Alaska. The substantive rules — particularly the treatment of income from separate property and the standard for transmutation — vary enough across these states that cross-state generalizations are unreliable. Louisiana's regime retains the strongest civil law character and uses distinct terminology. Wisconsin adopted a community property-based system under the Uniform Marital Property Act in 1986 and uses "marital property" rather than "community property" as the operative term.
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Encyclopedia Cross-Reference
family_24: Marital Property — Community Property States (Principles and Presumptions) — The Law Mind Family Law Encyclopedia
property_13: Concurrent Ownership — Community Property (State Variations) — The Law Mind Property Law Encyclopedia
tax_17: Community Property Federal Tax — The Law Mind Tax Encyclopedia
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