Intestacy reaches only the probate residue, which is why some people with no will still pass most of their wealth exactly as they intended. Beneficiary designations on retirement accounts and life insurance, jointly held property with a right of survivorship, payable-on-death and transfer-on-death registrations, and assets already titled in a funded trust all transfer under their own instruments and never enter the estate the intestacy statute governs. So a person whose wealth sits almost entirely in a 401(k) with a current beneficiary form and a house held jointly with their spouse may leave very little for intestacy to decide. The inverse is equally true: someone whose assets are a solely titled brokerage account, a car and a house in their name alone leaves nearly everything to the statute. The practical question is therefore not "do I have a will" but "what would be left for a will to govern," and the answer varies enormously between two households with the same net worth.
The belief that a surviving spouse takes everything is the single most common and most expensive misunderstanding, and it is false in many states. The share frequently turns on two facts: whether the decedent left descendants or parents, and whether the children are shared with the surviving spouse. Michigan, one of the states that has adopted the Uniform Probate Code, is a useful illustration of the shape. Under its statute the spouse takes the entire intestate estate only where no descendant and no parent of the decedent survives. Where all the decedent's surviving descendants are also descendants of the surviving spouse and the spouse has no other descendants, the spouse takes a fixed dollar amount set by the statute plus half the balance. Where no descendant survives but a parent of the decedent does, the spouse takes the fixed amount plus three quarters of the balance, so a surviving parent takes a quarter ahead of the spouse's full share. And where none of the decedent's surviving children are the surviving spouse's, the fraction stays at half but the fixed amount itself is lower, so a blended family changes the spouse's share through the part of the formula nobody reads.
That is one state's schedule, offered to show the structure rather than the rule. The fixed dollar amount, the fractions, whether parents rank at all, and how a blended family is handled all differ from state to state, and a state that has not adopted the uniform act may organize the whole question differently. What generalizes is only the lesson: the spouse's share is a function of who else survived, and it is very often not the whole estate.
The order below the spouse, in the shape most states use. Descendants come first, taking by representation so that a grandchild generally steps into the place of a parent who died before the decedent. If no descendants survive, parents. Then the parents' descendants, meaning the decedent's siblings and their children. Then grandparents and their descendants, which reaches aunts, uncles and cousins. Some states stop at a defined degree of kinship and some keep going. Only when the statute is exhausted does property escheat to the state, which is why the folk belief that "the state takes it" is usually wrong: statutes reach a long way out before that point, and an unwilling heir the decedent had never met is a far more likely outcome than escheat.
The people an intestacy statute cannot see. An unmarried partner, however long the relationship, is generally not on the list at all, and this is the single biggest exposure for couples who never married. A stepchild who was never legally adopted is generally not a descendant. A close friend, a caregiver, a godchild and a charity are all outside it. Nothing about the length or quality of the relationship changes that, because the statute operates on legal status.
Where the details diverge sharply and no national statement is safe. Whether half-siblings share equally with whole siblings. Whether a non-marital child inherits from a father, and what proof is required. How an adopted child relates to both the adoptive and the biological family. Whether a person who survives the decedent by only a few hours is treated as having survived at all, which many states resolve with a fixed survival period. And in community property states, how the marital half of the property interacts with the intestacy rules for the rest. On each of these the sensible posture is to look up the governing state rather than to carry a general answer.
Two consequences beyond who gets the money. An intestate estate still goes through probate, and the court appoints an administrator to run it because there is no nominated executor, which frequently means a family member applying for authority the decedent never granted. And where minor children survive, the court selects their guardian without a nomination from the parent to guide it, which is the consequence parents most often say they would have written a will to avoid.