Informal vs. Formal Probate in Idaho

Part of my Idaho Wills & Probate Overview.

By Ronald W. Brilliant, Attorney at Law · Licensed in Idaho, Nevada & California · Last reviewed: September 2026 against the Idaho Code as posted by the Idaho Legislature (July 1, 2026)

In This TopicIdaho Wills & ProbateTopic 8 of 15: Informal vs. Formal

Idaho uses the Uniform Probate Code, which offers two main paths for probating a will and appointing a personal representative, a term that includes an executor or administrator: informal proceedings and formal proceedings (Idaho Code §§ 15-1-101, 15-1-201(35), 15-3-105). Informal proceedings are handled without notice to interested persons by an officer of the court acting as a registrar, while formal proceedings are conducted before a judge with notice to interested persons (Idaho Code § 15-1-201(20), (24)).

This page compares the two paths and a third option, supervised administration, and covers where and when to file.

Why Probate May Be Needed

With limited exceptions, a will is not effective to prove the transfer of property or to nominate an executor unless it is declared valid by an order of informal probate by the registrar or an adjudication of probate by the court (Idaho Code § 15-3-102). To have the powers of a personal representative, a person must be appointed by the court or registrar, qualify, and be issued letters, and administration of an estate begins when letters are issued (Idaho Code § 15-3-103).

Some small estates can avoid probate entirely. See The Idaho Small Estate Affidavit.

Which Court and Where to File

In Idaho, the probate court is the district court (Idaho Code § 15-1-201(8)). The registrar’s functions are performed by a magistrate or district judge (Idaho Code §§ 15-1-201(42), 15-1-307). The court has exclusive jurisdiction of formal proceedings to determine how estates subject to Idaho law are to be administered, expended, and distributed (Idaho Code § 15-3-105).

Venue for the first informal or formal proceeding is the county where the decedent was domiciled at death, or, if the decedent was not domiciled in Idaho, any county where the decedent’s property was located at death (Idaho Code § 15-3-201(a)). Later proceedings generally stay in the county where the first one occurred, unless transferred (§ 15-3-201(b)). If proceedings could be brought in more than one place, the court where the proceeding is first commenced has the exclusive right to proceed (Idaho Code § 15-1-303(a)). For estates of people who lived in another state, see Out-of-State Estates and Idaho Probate.

The Three-Year Time Limit

As a general rule, no informal probate or appointment proceeding and no formal testacy or appointment proceeding may be started more than 3 years after the decedent’s death (Idaho Code § 15-3-108). The statute lists exceptions, including a proceeding to probate a will previously probated at the testator’s domicile, appointment proceedings for an estate that already had an appointment, and proceedings under §§ 15-3-1201 and 15-3-1205 (§ 15-3-108). The limit also does not apply to proceedings to construe probated wills or to determine heirs of a person who died without a will (§ 15-3-108).

Informal Probate and Appointment

Informal probate starts with a written application to the registrar (Idaho Code § 15-1-201(1)). The applicant must verify that it is accurate and complete to the best of his or her knowledge and belief (Idaho Code § 15-3-301). Among other things, it must include the applicant’s interest, the decedent’s name, age, date of death, and domicile, the names and addresses of the spouse, children, heirs, and devisees, and a statement that the time limit has not expired (§ 15-3-301(a)).

An application to informally probate a will must also state that the original will is with the court or accompanies the application (or that a certified copy of a will probated elsewhere accompanies it), that the applicant believes it was validly executed, and that after reasonable diligence the applicant is unaware of any instrument revoking it and believes it is the decedent’s last will (Idaho Code § 15-3-301(b)).

What the Registrar Does

The registrar reviews the application and must determine, among other things, that it is complete, venue is proper, the applicant appears to be an interested person, an original, duly executed, and apparently unrevoked will is in the registrar’s possession, and the time limit has not expired (Idaho Code § 15-3-303(a)). A will that appears to have the required signatures and contains an attestation clause showing the execution requirements were met is probated without further proof (§ 15-3-303(c)).

If those findings are made, the registrar issues a written statement of informal probate if at least 5 days have passed since the death (Idaho Code § 15-3-302). For an informal appointment, the registrar appoints the applicant if at least 120 hours have passed since the death, but for a nonresident decedent the registrar must delay the appointment until 30 days have passed unless the applicant is the personal representative appointed at the decedent’s domicile or the will directs that the estate be subject to Idaho law (Idaho Code § 15-3-307(a)).

The registrar may decline if not satisfied the will should be informally probated, but a declination is not an adjudication and does not prevent formal probate (Idaho Code § 15-3-305). Informal probate must be declined in some cases, such as a known series of testamentary instruments (other than a will and its codicils) where the latest does not expressly revoke the earlier (Idaho Code § 15-3-304).

Notice in Informal Proceedings

Notice of an application for informal probate must be given to anyone who has filed a demand for notice and to any personal representative whose appointment has not ended, and no other notice of informal probate is required (Idaho Code § 15-3-306). Notice of an informal appointment request goes to anyone who demanded notice and to anyone with a prior or equal right to appointment who has not waived it in writing and filed the waiver with the court (Idaho Code § 15-3-310).

After a statement of informal probate is issued, if no letters are issued to a personal representative, the applicant must notify all heirs and devisees of the admission of the will to probate by ordinary mail, to those whose addresses are reasonably available (Idaho Code § 15-3-303A). The applicant is responsible to any heir or devisee harmed by a failure to give proper notice under that section (§ 15-3-303A).

Surviving Spouse and an All-Community Estate

Idaho also allows an informal statement of intestacy where there is no will, the estate is entirely community property, and there is a surviving spouse (Idaho Code § 15-3-301(a)(6)). The application includes an affidavit of the surviving spouse, or someone acting on the spouse’s behalf, that there is no will, the estate consists solely of community property of the decedent and surviving spouse, and he or she is the surviving spouse, with a request for a statement that there is no will, that all assets are community, and that the surviving spouse is the sole heir (§ 15-3-301(a)(6)). The resulting statement has the same effect as a statement of informal probate of a will and is subject to the § 15-3-108 time limits, even though that section otherwise exempts determinations of heirs (§ 15-3-301(h)).

Effect of Informal Probate

Informal probate is conclusive as to all persons until it is superseded by an order in a formal testacy proceeding (Idaho Code § 15-3-302). The status, powers, and duties of a personal representative are fully established by informal appointment (Idaho Code § 15-3-307(b)). Generally, no bond is required of a personal representative appointed in informal proceedings, with listed exceptions such as a will that expressly requires bond (Idaho Code § 15-3-603).

Formal Probate

A formal testacy proceeding is litigation to determine whether a decedent left a valid will (Idaho Code § 15-3-401). An interested person starts it by filing a petition, a written request to the court for an order after notice (Idaho Code §§ 15-1-201(36), 15-3-401). A petition for formal probate asks for an order on the decedent’s testacy in relation to a particular will and determining the heirs (Idaho Code § 15-3-402(a)(1)).

The court sets a hearing, and the petitioner must give notice to the surviving spouse, children, other heirs, devisees and executors named in wills offered or probated, any personal representative still serving, and anyone who filed a demand for notice (Idaho Code § 15-3-403(1)). Notice is generally mailed or delivered at least 14 days before the hearing (Idaho Code § 15-1-401(a)).

If the petition is unopposed, the court may order probate or intestacy based on the pleadings if satisfied that the § 15-3-409 conditions are met, or hold a hearing and require proof (Idaho Code § 15-3-405). Subject to appeal and to vacation, the formal testacy order is final as to all persons on the issues the court considered or might have considered about whether there is a valid will and on the determination of heirs (Idaho Code § 15-3-412).

Formal proceedings are also the only way to object to an appointment, and the only way to appoint someone who lacks priority (Idaho Code § 15-3-203(b), (e)). Disputes over a will’s validity are covered in Will Contests in Idaho.

Who Has Priority to Serve as Personal Representative

Whether proceedings are formal or informal, persons who are not disqualified have priority for appointment in this order (Idaho Code § 15-3-203(a)):

Priority	Person
1	The person with priority under a probated will, including a person nominated by a power in the will (§ 15-3-203(a)(1))
2	The surviving spouse who is a devisee (§ 15-3-203(a)(2))
3	Other devisees (§ 15-3-203(a)(3))
4	The surviving spouse (§ 15-3-203(a)(4))
5	Other heirs (§ 15-3-203(a)(5))
6	Any creditor, 45 days after the death (§ 15-3-203(a)(6))
7	The public administrator, if a petition for appointment has been filed and 60 days pass with no consent to act filed by any proper person (§ 15-3-203(a)(7))

A person under 18, or a person the court finds unsuitable in formal proceedings, is not qualified to serve (Idaho Code § 15-3-203(f)). The personal representative’s duties are covered in Personal Representative Duties in Idaho.

Supervised Administration

Supervised administration is a single proceeding to secure complete administration and settlement of an estate under the continuing authority of the court (Idaho Code § 15-3-501). Any interested person or a personal representative may petition for it at any time (Idaho Code § 15-3-502). After notice, the court orders it if the will directs it (unless circumstances have changed and it is not necessary), only on a finding it is necessary to protect interested persons if the will directs unsupervised administration, and in other cases if the court finds it necessary (§ 15-3-502).

Unless restricted by the court, a supervised personal representative has all the powers of a personal representative, but may not make any distribution of the estate without prior court order (Idaho Code § 15-3-504). Unless the court orders otherwise, supervised administration ends by an order following the time limits, notices, and contents required for proceedings under § 15-3-1001 (Idaho Code § 15-3-505).

Informal vs. Formal at a Glance

Feature	Informal	Formal
Who decides	An officer of the court acting as registrar (Idaho Code § 15-1-201(24))	A judge (§ 15-1-201(20))
Notice to interested persons before the decision	Limited to those who demanded notice and certain others (§§ 15-3-306, 15-3-310)	Required, with a hearing (§ 15-3-403)
Earliest action after death	Informal probate: 5 days (§ 15-3-302); informal appointment: 120 hours (§ 15-3-307(a))	After the notice period and any needed hearing (§ 15-3-409)
Effect	Conclusive until superseded by a formal testacy order (§ 15-3-302)	Final, subject to appeal and vacation (§ 15-3-412)
Objecting to an appointment	Not available (§ 15-3-203(b))	Available (§ 15-3-203(b))
Closing the estate	Verified closing statement filed no earlier than 6 months after the original appointment of a general personal representative (§ 15-3-1003(a))	Petition for an order of complete settlement, decided after notice and hearing (§ 15-3-1001(a))

The closing statement is available unless a court order prohibits it, but not for an estate in supervised administration (Idaho Code § 15-3-1003(a)). For details on finishing an estate, see Closing an Estate in Idaho. Definitions of terms used here are in the Idaho Probate Glossary.

How I Can Help

I can help you decide whether informal probate, formal probate, or supervised administration fits your situation, prepare the application or petition, give the required notices, and guide the personal representative through administration and closing. Request a consultation to discuss your situation.

This page provides general information about Idaho wills and probate, based on the Idaho Code, and is not legal advice. Court rules and case law also affect these matters. Every situation is different; consult an attorney about yours. Reading this page does not create an attorney-client relationship.