Domicile

Unlike residency, which can be established mechanically by spending enough days in a place, domicile requires a two-part showing: a person must actually be present in a jurisdiction and must intend for it to be their permanent home with no present plan to leave. Courts and tax authorities examine evidence such as where a person votes, keeps their most valued possessions, attends religious services, and maintains their primary bank relationships.

For wealthy families, domicile carries enormous stakes. Most U.S. states impose income tax on domiciliaries worldwide — meaning a family domiciled in a high-tax state may owe that state's tax on income earned anywhere on Earth, even if the family spends much of the year elsewhere. Estate and inheritance taxes can also follow domicile, sometimes reaching assets held in other states or countries.

A common confusion: many people assume moving physically to a new state automatically changes their domicile. In practice, a person who relocates to a lower-tax state but keeps their primary social ties, family home, and organizational memberships in the old state may find that the original state successfully argues domicile was never abandoned. A qualified tax attorney must evaluate any specific situation. Families navigating a move often find it relevant to review resources like managing substantial wealth for broader context.