🔑 Probate governs the residue, and that is the framing that makes the whole subject tractable. Most household wealth leaves an estate without touching a court. A retirement account or life insurance policy pays whoever is named on its beneficiary form. Property held jointly with a right of survivorship passes to the surviving owner by operation of the title. Assets retitled into a funded trust pass under the trust's terms. What is left over is what probate administers, which in many estates means a solely titled bank or brokerage account, a car, and personal belongings. Probate is not a penalty and not evidence that anything was done wrong; it is simply the default path for whatever had no other one. Its significance in a particular estate is therefore a question about the other three channels rather than about the court.
One qualification on that, because it is a common trap. A beneficiary form left blank, or naming someone who died first with no contingent beneficiary, usually sends the asset to the estate, which lands it in probate after all. That is reliably true of an individual retirement account. It is generally not true of a workplace plan such as a 401(k) for a married participant, because federal law lets the plan default to the surviving spouse, and most plans do. Collapsing those two cases is one of the more consequential errors in this area.
The vocabulary, and whose vocabulary it is. The Uniform Probate Code's umbrella term for the person who administers the estate is personal representative, defined to include "an executor, administrator, successor personal representative, special administrator and a person who performs substantially the same function under the appropriate governing law." Within that, an executor is the person the will nominated, and an administrator is appointed by the court where there is no will or where the nominated person cannot or will not serve. Nomination is not appointment: under the Code a person must be "appointed by order of the court or registers, qualify and be issued letters", and "administration of an estate is commenced by the issuance of letters." Those letters, often called letters testamentary or letters of administration, are the document a bank will actually ask to see, and until they exist nobody has authority to act.
⚠️ It does not follow that the court appoints everyone a will names. Guardianship of a minor child runs on a different track: in Uniform Probate Code states the appointment is the parent's rather than the court's, made "by will or other signed writing", and it becomes effective on whichever comes first of the appointing parent's death, an adjudication that the parent is incapacitated, or a physician's written determination that the parent can no longer care for the child, subject to a process by which others may object. So "the will nominates and the court appoints" describes the personal representative accurately and the guardian inaccurately.
What the process actually does. Broadly, a petition is filed with the will; the court determines whether the will is valid and appoints the personal representative; that person inventories the estate, notifies known creditors and usually publishes notice to unknown ones, pays valid debts, expenses and taxes, files any final income tax return and a fiduciary return if the estate had income, accounts to the court, and distributes what remains. The Uniform Probate Code offers an informal or unsupervised route, conducted without notice to interested persons by a court officer, alongside formal and supervised proceedings for contested or complicated estates. Whether an unsupervised route is the default, or exists at all, is one of the things that differs by state rather than being a general feature of probate.
Where numbers are demanded and cannot honestly be given. Five things about probate vary too much for a national answer, and each is routinely stated as though it did not.
Cost. A small number of states set statutory fee schedules for the personal representative or the attorney; most do not, and instead allow reasonable compensation. The widely repeated claim that probate consumes a particular percentage of an estate has no national basis and should not be relied on for any particular state.
Duration. It is measured in months rather than weeks nearly everywhere, and beyond that the range is wide. A contested will, an illiquid asset, or a required creditor period can extend it considerably.
The creditor window. Claims arising before death are barred unless presented within a defined period, but both the length and the way it interacts with notice are set by state law. Maine's version, to take one enacted example, bars claims not presented within the earlier of nine months after death or the period fixed by the notice given. Do not assume that figure travels.
Small-estate routes. Most states offer a simplified procedure, sometimes by affidavit and without a full administration, for estates below a threshold. The thresholds differ enormously between states, and so does what counts toward them.
Privacy. Probate is generally a public proceeding, and a will admitted to probate generally becomes a public record. How much detail is practically accessible, and whether inventories are filed publicly, differs.
One structural point that does travel. Real property is administered where it sits. Owning a house or land in a second state can require its own separate proceeding there, in addition to the main administration in the state of domicile. That is a large part of why probate avoidance is worth more to someone who owns property in two states than to someone who owns one home.