What you need to know
Every state splits probate into at least two tracks: a quick, paperwork-driven one for estates nobody's fighting over, and a courtroom one for estates where somebody is. Which track an estate lands on has nothing to do with its size — a $50,000 estate can end up in formal probate, and a $5,000,000 one can sail through informally.
What informal probate actually looks like
Informal probate is closer to a records filing than a courtroom proceeding. The personal representative files the original will and a petition with the probate registrar — not a judge — who checks that the paperwork is complete, the will looks valid on its face, and nobody's filed an objection. Within days to a few weeks, that office issues Letters Testamentary, the single document that proves this person can act for the estate: open accounts, sign for property, deal with creditors. No hearing gets scheduled, and no one has to explain themselves in front of a judge unless a problem surfaces later. This is the default track in most states for the estate that looks like most estates — a will everyone agrees is genuine, and heirs who aren't fighting about who's in charge.
What pulls a case into formal probate
Formal probate exists for exactly the situations informal probate isn't built to handle: a will contest, where someone claims the document is forged, the product of undue influence, or signed while the deceased lacked capacity; a dispute over who should serve as personal representative, which happens more often than people expect when a blended family or estranged sibling is involved; a will that's missing, ambiguous, or contradicts an earlier one; or a creditor or beneficiary formally objecting to how the estate is being handled. Once any of these appears, a judge gets involved at every major step — approving the representative's appointment, signing off on the accounting, authorizing a sale of estate property, and finally closing the file. Some states go a step further and split formal probate itself into supervised administration, where the court approves nearly every action from start to finish, and unsupervised (or "independent") administration, where the representative acts freely after the initial appointment and files one final accounting at the end.
A track can change mid-case
One detail that surprises families: probate isn't locked onto one track for good. An estate can open informally, move along smoothly for months, and then get pulled into formal proceedings the moment a beneficiary files an objection — over the will's validity, over an asset sale, over anything. Nothing already filed has to be redone, but everything from that point forward slows down and usually needs an attorney. This is why "informal" isn't the same as "uncontested forever" — it's a starting assumption that can be revisited if a dispute shows up later.
Worth knowing
The details about formal vs. informal probate that catch people off guard.
Worth knowing
The track can change mid-case, and once it does, timelines and legal costs both jump.
Worth knowing
Informal still ends with a real accounting and a formal closing document — it's lighter-touch, not unsupervised indefinitely.
Worth knowing
Some estate types default into formal automatically in certain states — unknown heirs, or a trust named as a beneficiary — regardless of whether anyone actually disagrees about anything.
Worth knowing
Choosing formal probate voluntarily is allowed in most states, even without a dispute, if a personal representative wants the extra protection of a judge's sign-off before a decision a beneficiary might later challenge.
Common questions
No — states that haven't adopted the Uniform Probate Code's language often call the same split by other names, like "summary" or "unsupervised" administration. The underlying distinction between an administrative filing and a judicial hearing shows up in some form almost everywhere.
Not usually required by law, and many families handle straightforward informal probate on their own using their state's standard forms. Formal probate, especially anything contested, is a different story — it's difficult to navigate without one.
It depends on whether the will and the heirs agree with each other, not on the estate's size. A modest estate with a disputed will goes formal; a large estate with a clear will and cooperative heirs stays informal.
Related guides
Other distinctions worth understanding before an estate moves through probate.
General information as of 2026-09-17, not legal advice for a specific estate. Rules and dollar thresholds vary by state and change over time — confirm current figures before relying on any of them.