Informal vs. Formal Probate in Arizona: Which One Applies to You

Arizona probate comes in three forms — informal, formal, and supervised — and which one your situation requires depends on a few specific facts: whether there is a valid will, whether anyone disputes it, whether the heirs are clear, and whether the court needs to keep an eye on how the estate is handled. The good news is that the large majority of Arizona estates qualify for informal probate, the simplest and least expensive path, handled largely through a registrar with little or no courtroom time. This guide explains the differences and what pushes an estate from one category to another. Available 24/7 • Free confidential consultations • (480) 725-2257

The three types at a glance

The vast majority of Arizona estates that go through probate at all go through the informal route. Informal probate is designed to be administrative rather than adversarial — the probate registrar reviews the paperwork and issues the appointment without the estate having to appear before a judge.

Informal probate: the default path

Informal probate is governed by A.R.S. § 14-3301 and following. It is available when there is a valid will (or, with no will, clear heirs under Arizona’s intestacy rules) and no significant dispute about the will or the appointment of the personal representative.

How informal probate works

• The person seeking to be personal representative files an application with the probate registrar in the county where the decedent lived
• The application includes the original will (if any), the death certificate, and information about heirs and devisees
• The registrar reviews the application for compliance with the statutory requirements — that the will appears valid, that the applicant has priority for appointment, and that the required notices will be given
• If everything is in order, the registrar issues Letters of Appointment, typically without any court hearing
• The personal representative then administers the estate: notice, inventory, paying debts, distribution, and closing

When informal probate is a good fit

• There is a clear, validly executed will, or the heirs are clear under intestacy
• No one is contesting the will or the choice of personal representative
• The heirs and devisees are identified and locatable
• There are no vulnerable beneficiaries requiring special protection
• The personal representative is trusted by the family to act without court oversight

Formal probate: when there’s a dispute or a question

Formal probate involves a judge and court hearings. It is used when something about the estate needs judicial resolution rather than administrative processing.

What triggers formal probate

• A will contest. Someone challenges the validity of the will — alleging the decedent lacked capacity, was unduly influenced, was defrauded, or that the will was improperly executed.
• An ambiguous, damaged, or questionable will. The will is unclear, appears altered, is a copy rather than an original, or raises questions the registrar cannot resolve administratively.
• Competing applicants. More than one person seeks appointment as personal representative and they have equal or disputed priority.
• Unclear or disputed heirs. There is genuine uncertainty about who the legal heirs are — disputed parentage, questions about the validity of a marriage, unknown potential heirs.
• A request by an interested party. Sometimes an heir or beneficiary asks for formal proceedings specifically to get the certainty of a judicial determination.

How formal probate works

Formal probate begins with a petition rather than an application, and the matter is set for a hearing before a judge. Interested parties receive notice and an opportunity to participate. The judge resolves the contested issues — admitting or rejecting the will, determining heirs, appointing the personal representative — through one or more hearings. Once the contested threshold questions are resolved, administration proceeds, though the court may stay involved depending on the circumstances.

Formal probate takes longer and costs more than informal probate because of the hearings, the notice requirements, and frequently the involvement of attorneys for multiple parties. A contested will can turn formal probate into full-scale litigation lasting a year or more.

Supervised probate: ongoing court oversight

Supervised administration is the most court-involved form of Arizona probate. In supervised probate, the personal representative operates under the court’s continuing oversight and generally cannot make distributions without court approval.

When supervised probate is used

• Beneficiaries are vulnerable — minors, incapacitated adults, or others who need the court’s protection
• There is concern about whether the personal representative will act properly, and an interested party (or the court) wants ongoing monitoring
• The will itself directs supervised administration
• A history of conflict among the parties makes ongoing judicial supervision advisable

Supervised administration provides the most protection but at the cost of speed and expense. Every significant action may require court approval, which adds time and legal cost to the administration.

How an estate moves between categories

The three types are not entirely fixed at the start. An estate can shift:

• Informal to formal: If a dispute erupts during an informal probate — an heir contests the will, a conflict arises over the personal representative’s actions — an interested party can petition to move the matter into formal proceedings.
• Informal or formal to supervised: If circumstances reveal a need for ongoing oversight (a vulnerable beneficiary, a personal representative whose conduct raises concerns), the court can order supervised administration.
• The reverse is harder. Once a matter is in formal or supervised proceedings, it generally stays there until the issues that required court involvement are resolved.

The option to skip probate entirely

Before assuming any form of probate is necessary, it is worth confirming whether the estate can avoid probate altogether. Two situations make probate unnecessary:

• Non-probate assets. Property in a revocable living trust, accounts with named beneficiaries, jointly owned property with right of survivorship, and real estate transferred by a recorded beneficiary deed all pass outside probate. An estate consisting entirely of such assets needs no probate at all.
• The small estate affidavit. Under A.R.S. § 14-3971, as amended effective September 26, 2025, successors can use a small estate affidavit instead of probate when the values fall under the new limits — up to $200,000 in personal property and $300,000 in real property (net of liens). Because these limits rose so sharply, many estates that would have required probate a year ago now qualify for the affidavit. See our guide on the Arizona small estate affidavit.

Frequently asked questions

Which type of probate is most common in Arizona?

Informal probate. The large majority of Arizona probate cases proceed informally because most estates have a valid will or clear heirs and no significant dispute. Informal probate is the default unless something specific pushes the estate into formal or supervised proceedings.

Can I start with informal probate and switch if there’s a problem?

Yes. Many estates begin in informal probate and only move to formal proceedings if a dispute arises. Starting informal and converting if necessary is common. You do not have to predict every possible conflict at the outset.

Is informal probate really handled without a judge?

Largely, yes. The probate registrar — not a judge — reviews and approves informal applications, and Letters of Appointment are typically issued without a courtroom hearing. A judge gets involved only if the matter becomes contested or someone petitions for court review.

Does a will guarantee informal probate?

No. A valid, uncontested will is the usual ingredient for informal probate, but a will that is challenged, ambiguous, damaged, or only available as a copy can require formal proceedings. The existence of a will helps, but it is the absence of dispute that keeps a probate informal.

What if there is no will at all?

Informal probate is still available when there is no will, as long as the heirs are clear under Arizona’s intestate succession statutes and no one disputes the appointment of the personal representative. The estate is distributed according to the intestacy rules rather than a will, but the process can still be informal.

How much more does formal probate cost than informal?

It varies widely with the nature of the dispute. An uncontested formal probate (one that is formal for a technical reason rather than a fight) costs somewhat more than informal due to the hearing requirements. A genuinely contested formal probate — a will contest or heirship dispute — can cost many times more because of attorney time, discovery, and litigation.

Related Probate and Estate Resources

• Arizona Probate: The Complete Overview
• How Long Does Probate Take in Arizona
• Arizona Personal Representative Duties: Step-by-Step Guide
• Arizona Small Estate Affidavit: New 2025 Limits
• Arizona Revocable Living Trust: How to Avoid Probate