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Idaho Will Contests
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Idaho Will Contests

Will contests in Idaho require standing and grounds like undue influence or lack of capacity. Objections must be timely.

By Settled Editorial

An Idaho will contest is a formal testacy proceeding, which Idaho Code 15-3-401 defines as litigation to determine whether a decedent left a valid will. An interested person starts it by petition in the district court, the county's magistrate division usually hears it, and Idaho Code 15-3-108 sets the outer deadline.

Two Idaho facts shape everything below. The grounds sit in the statute itself, because Idaho Code 15-3-407 names them while it assigns the burden of proof. And an informal probate in Idaho can open with almost no notice to the family, so the 12-month contest window can start running before an heir knows a will was filed.

This page describes the mechanism. It is general information about Idaho law and says nothing about whether a challenge fits any family's facts. The bar is high: the contestant carries the burden of proof on every ground except due execution, and the deadlines below are strict. Whether a particular will can be challenged is a question for a licensed Idaho attorney, and an early conversation leaves more room. If the estate has not opened yet, the Idaho probate process covers the steps a contest interrupts.

What an Idaho Will Contest Is

Idaho Code 15-3-401 lets an interested person file a petition asking the court, after notice and hearing, to do one of five things:

  • enter an order probating a will
  • set aside an informal probate of a will
  • prevent informal probate of a will that is the subject of a pending application
  • set aside a determination that the entire estate is community and there is a surviving spouse
  • declare, under Idaho Code 15-3-402(c), that the decedent died intestate

The fourth item reflects Idaho's community property system. A family that disputes a finding that everything was community property uses the same formal testacy route. The Idaho community property guide explains how that classification decides who takes what.

A petition may seek formal probate of a will whether or not the same or a conflicting will has already been informally probated, and it need not ask for a personal representative at all. That matters when the fight is about the document rather than about who runs the estate.

Filing changes the estate right away. Idaho Code 15-3-401 does the work in two sentences:

  • The registrar stops. While a formal testacy proceeding is pending, the registrar shall not act on any application for informal probate of any will of the decedent or for informal appointment of a personal representative.
  • Distribution stops. A personal representative appointed earlier must refrain from making any further distribution of the estate once notice of the formal proceeding arrives, unless the petition also asks the court to confirm that earlier appointment. A petitioner who wants a different representative may also ask the court to restrain the sitting one and appoint a special administrator under Idaho Code 15-3-614. Without that request, or if the court denies it, the sitting representative keeps every other power and duty described in Idaho executor duties.

A contest is the wrong tool for a complaint about how the estate is being run. Idaho Code 15-3-502 lets any interested person ask for supervised administration at any time, and it can ride along with a testacy petition. That is a separate request with its own test.

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Who Can File

Only an "interested person" can start a formal testacy proceeding. Idaho Code 15-1-201(25) says the term includes heirs, devisees, children, spouses, creditors, beneficiaries and any others having a property right in or claim against the estate which may be affected by the proceeding, plus persons with priority for appointment as personal representative. The same subsection adds that the meaning "may vary from time to time and must be determined according to the particular purposes of, and matter involved in, any proceeding."

So standing depends on the relief sought. An heir who would inherit more if the will fell has an interest in a petition to set it aside. A creditor usually does not care which will controls, because the debt is owed either way. Section 15-1-201 was amended in 2026 by chapter 79, with a second version taking effect January 1, 2027; the definitions of "court" and "interested person" read the same in both versions.

The Deadline to Contest an Idaho Will

Idaho runs two clocks, and the second one is why a family that just learned about an informal probate is often still in time.

SituationDeadlineStatute
Opening any informal probate or formal testacy proceedingNot more than 3 years after the death15-3-108
Contesting a will that was informally probatedThe later of 12 months from the informal probate or 3 years from the death15-3-108(3)
Earlier proceeding dismissed over doubt about the fact of deathAny time after, on a finding that the death came first and the petitioner did not delay unduly15-3-108(1)
Estate of an absent, disappeared or missing person with a conservatorWithin 3 years after the conservator can establish the death15-3-108(2)
Construing a probated will, or determining the heirs of an intestateThe three-year limit does not apply15-3-108

Read the second row twice. Because the period runs to whichever date falls later, an informal probate opened near the three-year mark still carries a full 12 months of contest exposure. A representative who assumes the file went quiet at the three-year anniversary has read only half the subsection. The Idaho probate timeline places these dates next to the ordinary schedule.

Why the 12-month clock can start without you

Idaho Code 15-3-306 says the person applying for informal probate must give notice of the application to two groups only: anyone who filed a demand for notice under Idaho Code 15-3-204, and any personal representative whose appointment has not been terminated. The statute closes with "No other notice of informal probate is required."

The family usually hears afterward. Idaho Code 15-3-705 requires a newly appointed personal representative to send information about the appointment to the heirs and devisees within 30 days. That notice arrives after the informal probate, so part of the 12-month window may already be gone.

Idaho law provides a mechanism aimed at that gap, the demand for notice. Idaho Code 15-3-204 lets any person with a financial or property interest file one with the court at any time after the death, stating the decedent's name, the nature of the interest and a mailing address. After it is on file, no order or filing it covers may be made or accepted without notice to the person who filed it. The court fee schedule lists a demand for notice in a probate at $9.00.

A separate clock for fraud in the proceeding

Idaho Code 15-1-106 gives anyone injured by fraud in a probate proceeding, or in a statement filed under the probate code, a claim against the person who committed it. That claim must be brought within two years after the fraud is discovered, and never more than five years after the fraud against someone who did not commit it. The section says it has no bearing on fraud practiced on the decedent during life that affects the estate. That kind of fraud is a ground for contesting the will itself under 15-3-407, inside the 15-3-108 window.

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The Grounds Idaho Recognizes

Idaho Code 15-3-407 lists the grounds in one sentence: "Contestants of a will have the burden of establishing lack of testamentary intent or capacity, undue influence, fraud, duress, mistake or revocation." Each one maps to a fact the challenger has to prove.

  • Lack of testamentary capacity. Idaho Code 15-2-501 says any emancipated minor or any person 18 or more years of age "who is of sound mind" may make a will. The statute does not define sound mind, so the argument turns on evidence about the testator's condition when the will was signed.
  • Lack of testamentary intent. The document was never meant to work as a will, even if it looks like one.
  • Undue influence. Someone overpowered the testator's own wishes so the will reflects that person's choices. Idaho's probate code names the ground and leaves its elements to the courts.
  • Fraud and duress. The testator was deceived about the document or its contents, or signed under threat.
  • Mistake. A mistake that goes to what the testator was signing.
  • Revocation. Idaho Code 15-2-507 says a will is revoked by a later will that revokes it expressly or by inconsistency, or by being burned, torn, canceled, obliterated or destroyed with the intent to revoke, by the testator or by another person in the testator's presence and at the testator's direction. Under Idaho Code 15-2-508, a divorce or annulment revokes gifts to the former spouse and that spouse's nomination as executor, unless the will says otherwise.

Attacking the signing

Improper execution is the other avenue, and there the burden sits on the other side. Idaho Code 15-3-407 says proponents of a will "have the burden of establishing prima facie proof of due execution in all cases." The execution rules live in Idaho Code 15-2-502 (a writing, the testator's signature and two witnesses) and 15-2-503 (a holographic will whose signature and material provisions are in the testator's handwriting). The Idaho will requirements guide walks through what makes an Idaho will valid.

Idaho Code 15-3-406 decides how execution gets proved in a contested case:

  • A will that is not self-proved. If evidence about execution is needed, the testimony of at least one attesting witness is required, if that witness is within the state and competent and able to testify. Due execution may also be proved by other evidence.
  • A self-proved will. Compliance with the signature requirements is conclusively presumed, and the other execution requirements are presumed subject to rebuttal, without any witness testifying, unless there is proof of fraud or forgery.

A self-proving affidavit closes the signature question and leaves capacity, undue influence, fraud, duress, mistake and revocation open.

Two rules about order and burden

Idaho Code 15-3-407 adds two procedural rules for contested cases. Each party carries the ultimate burden of persuasion on the matters where it had the initial burden of proof. And when two wills compete, the court decides first whether the later will is entitled to probate. When a will is opposed by a petition declaring intestacy, the court decides first whether the will is entitled to probate.

How the Case Moves

The statutes describe the path an Idaho contest follows once it starts.

  1. Venue. Idaho Code 15-3-201 puts venue for the first proceeding in the county where the decedent was domiciled at death, or, for a nonresident, any county where the decedent's property was located. Later proceedings stay in that county unless transferred. The case is filed with the clerk of the district court, and Idaho Code 1-2208(2) lets the administrative judge assign probate of wills to the magistrate division. Idaho probate courts by county lists each courthouse.
  2. The petition or the objection. A petition to set a will aside is brought under 15-3-401. A person who is already a party to a formal proceeding and opposes the will must put the objection in writing, because Idaho Code 15-3-404 says any party who opposes the probate of a will "for any reason shall state in his pleadings his objections to probate of the will."
  3. Notice. Under Idaho Code 15-3-403, the court fixes a hearing date, and the petitioner gives notice to the surviving spouse, children and other heirs, the devisees and executors named in any will offered for probate, and any personal representative still serving.
  4. Hearing and order. Idaho Code 15-3-409 has the court find that the testator is dead, that venue is proper and that the proceeding began within the 15-3-108 limit. It then determines domicile, the heirs and the state of testacy, and any will found valid and unrevoked is formally probated.

What it costs to file

The Idaho Supreme Court's civil filing fee schedule (Appendix A to the Idaho Rules of Civil Procedure, effective July 12, 2024) sets the court charges:

FilingFee
Petition for formal probate, as a new magistrate division case$166.00
Initial appearance by a person other than the plaintiff or petitioner$136.00
Demand for notice in a probate$9.00

The schedule defines an appearance as the first document a party other than the petitioner files in an existing civil action, whatever its title. So a family member who first appears in a pending probate by filing an objection pays the $136.00 appearance fee.

Attorney fees and the jury question

Idaho Code 15-3-720 says a personal representative, or a person nominated as one, who defends or prosecutes a proceeding in good faith, "whether successful or not," is entitled to necessary expenses and reasonable attorney's fees from the estate. That rule covers the fiduciary. The probate code has no matching rule that pays a challenger's fees from the estate.

On juries, Idaho Code 15-1-306 is short. A party who duly demands one is entitled to a jury trial on a controverted question of fact where a party has a constitutional right to a jury. Section 15-1-306 says nothing about an advisory jury. Whether a particular claim carries that constitutional right is a question for an Idaho attorney.

No-Contest Clauses

Many wills include a clause that cuts out anyone who challenges the will. Idaho Code 15-3-905 limits its reach: a provision "purporting to penalize any interested person for contesting the will or instituting other proceedings relating to the estate is unenforceable if probable cause exists for instituting proceedings."

Two points follow from the text. The protection covers other estate proceedings as well as a direct attack on the will. And the statute does not define probable cause, so whether a given challenge clears that bar is a question for the court and for the attorney evaluating the facts before filing.

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What Happens After the Order

Idaho Code 15-3-412 makes a formal testacy order final as to all persons on every issue the court considered or might have considered about whether the decedent left a valid will, subject to appeal and two narrow reopening routes:

  • A later-discovered will. The court shall entertain a petition to vacate its order and probate another will if the proponents of the later will did not know it existed at the time, or did not know of the earlier proceeding and got no notice except by publication.
  • An omitted heir. Where intestacy was ordered, the heirs may be redetermined if a person was left out and did not know of the relationship, the death, or the proceeding, and got no notice except by publication.

Either petition must be filed before the earliest of three dates in 15-3-412(3): the order approving final distribution (or six months after a closing statement), the 15-3-108 deadline, or twelve months after the order being challenged. Separately, Idaho Code 15-3-413 lets the court modify or vacate a formal testacy order for good cause within the time allowed for appeal.

If the challenged will falls, the estate passes under an earlier valid will if one exists, and otherwise under Idaho intestate succession. A successful contest also reshuffles who serves, because 15-3-108(3) frames the proceeding as one to secure appointment of the person with legal priority.

Before any of that, four narrow questions decide whether an Idaho contest is even available: whether the person filing is an interested person under 15-1-201(25), whether the 15-3-108 window is still open, whether the facts fit one of the grounds 15-3-407 names, and whether the will carries a 15-3-905 penalty clause. A licensed Idaho attorney answers all four against the actual documents.

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Sources:

This page describes Idaho's will contest procedure as the statutes and the court's fee schedule state it. It is not legal advice.

Information current as of September 24, 2026

Settled Estate is not a law firm, and this content is for informational purposes only and does not constitute legal advice. Probate laws and procedures in Idaho can change. Consult with a qualified attorney for advice specific to your situation. Full disclaimer.

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