Will Anti-Lapse and Substitute Gifts in Idaho

Short answer Idaho substitutes issue for a deceased devisee who was a grandparent or a lineal descendant of a grandparent of the testator. The issue must survive the testator by 120 hours; the rule also covers a qualifying class member who died before the will was signed. The will's expressed contrary intention controls. (Idaho Code §§ 15-2-603, 15-2-605.)
State
Idaho
Statute checked
October 5, 2026
Sources
9 statutes

At a glance

Instruments and gifts coveredWill devise, including a qualifying class gift (§ 15-2-605).
Which devisees qualifyGrandparent or lineal descendant of testator's grandparent (§ 15-2-605).
Death or failure triggerDead at execution, fails to survive testator, or treated as predeceased (§ 15-2-605).
Descendant survival periodIssue must survive testator by 120 hours (§ 15-2-605).
Who takes and howSame-degree issue take equally; remoter issue take by representation (§ 15-2-605).
Class giftsWould-be class devisee counts whether death preceded or followed will execution (§ 15-2-605).
Failed gift and residueOther failed nonresiduary gift enters residue; failed multiperson residuary share shifts proportionately; undisposed estate passes to heirs (§§ 15-2-606, 15-2-101).
Contrary intent and survival wordsExpressed will intention controls; special survival or common-disaster language affects deemed predecease (§§ 15-2-603, 15-2-601).
Alternative gifts and appointmentsExpressed will intention controls alternatives; general residue alone does not exercise a power of appointment (§§ 15-2-603, 15-2-610).
Trust and nonprobate reachPour-over gift to a qualifying trust follows its governing instrument; prior revocation or termination generally lapses the devise (§ 15-2-511).

Requirements one by one

Qualifying devisees and issue

Under § 15-2-605, the devisee must be a grandparent or lineal descendant of a grandparent of the testator. The rule reaches a devisee already dead when the will was executed, one who later fails to survive the testator, and one treated as predeceased. Substitute issue must survive the testator by 120 hours. Issue of the same degree take equally; more remote issue take by representation.

The same section includes someone who would have been a class devisee if alive, whether that person died before or after will execution. § 15-2-601 begins, “A devisee who does not survive the testator by one hundred twenty (120) hours is treated as if he predeceased the testator”; its stated will-language exceptions follow.

Failed gifts and will language

Subject to § 15-2-605, § 15-2-606(a) sends a failed nonresiduary devise into the residue. Under § 15-2-606(b), a failed share of a multiperson residue passes to the other residuary devisees proportionately. Any estate part not effectively disposed of by will passes to heirs under § 15-2-101.

§ 15-2-603 gives effect to the testator's intention expressed in the will and applies these construction rules unless the will indicates a contrary intention. § 15-2-601 specifically recognizes will language addressing simultaneous death, a common disaster, or a stated survival requirement.

Appointments and trust gifts

§ 15-2-610 says, “A general residuary clause in a will, or a will making general disposition of all of the testator’s property, does not exercise a power of appointment held by the testator” unless the will specifically refers to the power or otherwise indicates an intent to include its property. § 15-2-603 governs the effect of an expressed alternative disposition.

For a qualifying pour-over devise, § 15-2-511(2) sends property into the recipient trust for administration under its governing instrument unless the will says otherwise. Under § 15-2-511(3), revocation or termination of that trust before death generally causes the devise to lapse. These provisions describe a will-to-trust gift, rather than a substitute gift to a trust beneficiary.

What trips people up

A would-be class devisee's death before will execution does not itself remove that person from § 15-2-605. The statute still requires the specified relationship and issue who survive the testator by 120 hours.

Common questions

Does the failed gift always become part of the residue? No. Section 15-2-606 makes its fallback subject to the substitute-gift rule in § 15-2-605.

Does a broad residue clause exercise a power of appointment? Section 15-2-610 requires a specific reference to the power or another indication of intent to include its property.

Statutes and sources

  • Idaho Code §§ 15-2-101, 15-2-511, 15-2-601, 15-2-603, 15-2-605, 15-2-606 and 15-2-610. Verbatim official excerpts, section URLs, and access dates appear in the source fields above.

Source links

Every statute quoted above, linked, with the date we checked it.

Idaho Code § 15-2-101 · accessed 2026-10-05
Idaho Code § 15-2-511(2) · accessed 2026-10-05
Idaho Code § 15-2-511(3) · accessed 2026-10-05
Idaho Code § 15-2-601 · accessed 2026-10-05
Idaho Code § 15-2-603 · accessed 2026-10-05
Idaho Code § 15-2-605 · accessed 2026-10-05
Idaho Code § 15-2-606(a) · accessed 2026-10-05
Idaho Code § 15-2-606(b) · accessed 2026-10-05
Idaho Code § 15-2-610 · accessed 2026-10-05
This page gives general information about statutory substitute-gift rules, not advice about a particular will or beneficiary. The instrument's words, other law, and the facts can affect the result. Check current official law and consult a licensed adviser before acting.

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