Definition
A marital property system, used by a minority of states, in which most assets and debts acquired during a marriage belong equally to both spouses regardless of whose name is on the account or who earned the money. Property owned before the marriage, plus gifts and inheritances, usually stays separate.
Why it matters
Which system your state uses shapes how assets split in a divorce, who is liable for a spouse's debts, and how taxes work for married couples filing separately. It also affects inherited property: in community property states the surviving spouse can get a full step-up in cost basis on jointly held assets.