Module 1: Domicile & Foundations

Domicile requires two things: physical presence in a location, and genuine intent to remain there indefinitely. Neither element alone is sufficient — presence without intent, or intent without presence, doesn’t establish domicile.

Domicile as a distinct legal concept traces back to Roman civil law’s domicilium, which English ecclesiastical courts later adopted and developed independently for their own succession and probate jurisdiction, long before it migrated into the secular common law courts that use it today. That civil-law ancestry is part of why domicile has always required something more than mere physical location — Roman law distinguished a person’s origo (a fixed, inherited status) from where they actually lived, and English courts inherited that same instinct that a person’s “true legal home” had to reflect a genuine, settled connection rather than simply wherever their body happened to be standing. That inherited two-part structure — objective presence plus subjective, genuinely settled intent — is exactly the test still applied today, essentially unchanged in its basic shape for well over a century of American case law.

Example. Someone who moves to a new state, rents an apartment, and genuinely plans to stay indefinitely has established both elements. Someone visiting family for a month has physical presence but no intent to remain — no domicile change results.

Changing domicile requires establishing both elements in the new location and abandoning the prior domicile — not simply adding a second home. Once genuinely established, a new domicile can take effect essentially immediately, without any fixed minimum duration.

Just how instantaneous a domicile change can be was illustrated, memorably, in White v. Tennant, 31 W. Va. 790 (1888). Michael White, domiciled with his family in Pennsylvania, sold his Pennsylvania farm and moved his household to a new house in West Virginia, arriving and briefly staying overnight in the West Virginia house’s kitchen before he planned to formally move his belongings into the main house the next day — but he fell fatally ill that same night and died before ever occupying the main house itself. His heirs disputed whether his estate should be distributed under Pennsylvania or West Virginia inheritance law. The West Virginia Supreme Court of Appeals held that his domicile had already changed to West Virginia the moment he arrived there with his family and genuine intent to remain, even though he died within hours and had occupied only the kitchen rather than the whole house. The case remains the classic illustration that domicile changes the instant both elements are genuinely satisfied — there is no waiting period, no minimum duration, and no requirement of full, formal settling-in before the legal change takes effect.

Example. A person who moves permanently, with genuine indefinite intent, has changed domicile right away — they don’t need to wait out some minimum period before the change legally counts.

A person may have multiple residences — vacation homes, a work apartment — but only one domicile at any given time: the place of genuinely settled, indefinite connection.

The real stakes of this rule played out dramatically in Texas v. Florida, 306 U.S. 398 (1939), an original-jurisdiction case brought directly in the Supreme Court itself. Four states — Texas, Florida, Massachusetts, and New York — each separately claimed that a wealthy decedent, Edward Green, had been domiciled within their own borders at his death, and each wanted to collect its own state inheritance tax on his substantial estate. Because the one-domicile rule means Green could legally have had only one true domicile, at most one of the four states could actually be right, yet each state had won a favorable domicile finding in its own separate courts before the case ever reached the Supreme Court. The Court exercised its rare original jurisdiction specifically to resolve this genuine four-way conflict, ultimately determining Green had been domiciled in Massachusetts alone. The case is a vivid demonstration of why the one-domicile rule matters in the real world: without it, the same person’s estate could face duplicate, overlapping tax claims from every state with even a plausible connection to where they lived.

Example. Someone who owns homes in three states, but only genuinely intends to remain indefinitely in one of them, is domiciled only in that one state — the others are residences, not domiciles.

A minor (or a legally incompetent adult unable to form independent domicile intent) generally has their domicile determined by operation of law, tracking a custodial parent’s or guardian’s domicile, rather than forming their own independent intent.

Dependent domicile today applies only to minors and legally incompetent adults, but that wasn’t always the boundary. Historically, coverture-era common law treated a married woman’s domicile as automatically merging into her husband’s the moment she married, regardless of her own independent intent — a legal fiction that persisted well into the twentieth century in many states. Mas v. Perry, 489 F.2d 1396 (5th Cir. 1974), shows the modern rejection of that rule in practice. Jean Paul and Judy Mas, a married couple, sued their Louisiana landlord in federal court after discovering he had secretly installed two-way mirrors in their bedroom, and diversity jurisdiction turned on whether Judy Mas — an American citizen married to a French citizen, both graduate students temporarily living in Louisiana — was domiciled in Louisiana or retained her prior Mississippi domicile. The Fifth Circuit held that marriage does not automatically change a spouse’s domicile; Judy Mas had never independently formed the genuine intent to remain in Louisiana indefinitely (the couple was there only for graduate school), so her Mississippi domicile persisted regardless of her husband’s own domicile status. The case confirms that today, unlike under the old coverture rule, only minors and legally incompetent adults genuinely lack the capacity to form independent domicile intent — a competent adult spouse always retains their own.

Example. When a custodial parent genuinely changes domicile to a new state, their young child’s domicile generally changes right along with it, without any independent analysis of the child’s own intent.

Domicile is foundational to many doctrines: personal jurisdiction, divorce jurisdiction, choice-of-law analysis, diversity jurisdiction (an individual’s state citizenship for diversity purposes is determined by domicile), taxation, and probate.

Domicile, rather than residence or even citizenship, became the operative concept across all these doctrines for a genuine, consistent reason: it captures a meaningfully different idea than either alternative. Residence is purely factual and can multiply endlessly — a person can genuinely reside in several places at once, which makes it useless as a tiebreaker for questions that need exactly one answer, like which single state can grant a divorce or tax an estate. Citizenship, meanwhile, is a matter of political membership, generally national rather than state-level, and doesn’t track where someone’s actual, present life is centered — a U.S. citizen who has spent decades permanently settled abroad still holds U.S. citizenship, but that fact says nothing useful about which jurisdiction’s courts should actually be handling their divorce or probate. Domicile sits precisely between these two: unlike residence, it resolves to exactly one place at a time (recalling the one-domicile rule), and unlike citizenship, it actually tracks a person’s real, current center of life. That combination of properties — singular, and genuinely reflective of where a person’s life is actually centered — is exactly why it recurs across so many unrelated doctrines throughout the rest of this course.

Example. The same domicile determination that decides which state can grant someone’s divorce might also determine which state’s courts have diversity jurisdiction over an unrelated lawsuit that same person later files.