How Wills Are Interpreted 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 3 of 15: Interpreting Wills

After someone dies, the words of their will do not always fit what actually happened. A beneficiary may have died first, or property named in the will may have been sold. Idaho’s probate code has a set of “rules of construction” that govern how a will is read in situations like these (Idaho Code §§ 15-2-601 to 15-2-616).

These rules matter to anyone who is named in a will, anyone settling an estate, and anyone writing a will who wants it to work as planned. The Idaho Code calls the person who made the will the “testator.” A gift made by will is a “devise,” and a person named in a will to receive one is a “devisee” (Idaho Code § 15-1-201(11), (12)).

The Testator’s Intention Comes First

The starting point is simple: the intention of the testator, as expressed in the will, controls the legal effect of the will’s gifts (Idaho Code § 15-2-603). The rules of construction in this part of the code apply unless the will shows a contrary intention (§ 15-2-603).

That means many of the rules below are default rules that a will can override by showing a different intention (§ 15-2-603). For how a will is signed and witnessed in the first place, see Making a Valid Will in Idaho.

Which State’s Law Applies

A testator may choose the law of a particular state in the will. The meaning and legal effect of a gift is then decided under that state’s local law (Idaho Code § 15-2-602). The chosen law does not apply if it is contrary to Idaho’s elective share rules, Idaho’s rules on exempt property and allowances, or any other public policy of Idaho that would otherwise apply (§ 15-2-602).

A Will Covers Everything, Including Later Property

A will is read to pass all property the testator owns at death, including property acquired after the will was signed (Idaho Code § 15-2-604). So a will written years ago can still reach a house, account, or vehicle bought later.

Each gift in a will also passes the testator’s entire interest in the property that the testator could lawfully give. The exception is when the will clearly shows the testator meant to give something less (Idaho Code § 15-2-614).

The 120-Hour Survival Rule

A devisee must outlive the testator by 120 hours to take a gift. A devisee who does not survive the testator by 120 hours is treated as if he or she died before the testator (Idaho Code § 15-2-601).

This rule does not apply if the will has language dealing explicitly with simultaneous deaths or deaths in a common disaster. It also does not apply if the will requires the devisee to survive the testator, or to survive for a stated period, in order to take (§ 15-2-601). A similar 120-hour rule applies to heirs when there is no will; see Dying Without a Will in Idaho.

Simultaneous Deaths

Idaho has adopted the “uniform simultaneous death act” (Idaho Code § 15-2-613(f)). It applies when who gets property depends on who died first and there is no sufficient evidence that the people died other than at the same time. It is subject to extension by the 120-hour rules (§ 15-2-613).

Situation (no sufficient evidence of who died first)	How the property is handled
General rule	Each person’s property is distributed as if that person had survived (§ 15-2-613)
Two or more beneficiaries set to take one after another by survivorship	Property is split into equal portions, one for each such beneficiary, and each portion goes to those who would have taken if that beneficiary had survived (§ 15-2-613(a))
Two joint tenants	One-half is distributed as if one survived, and one-half as if the other survived (§ 15-2-613(b))
More than two joint tenants who all died this way	Distributed in the proportion that one bears to the whole number of joint tenants (§ 15-2-613(b))
Insured person and life or accident insurance beneficiary	Proceeds are distributed as if the insured survived the beneficiary (§ 15-2-613(c))

This section does not apply to wills, living trusts, deeds, or insurance contracts that provide for a different distribution (Idaho Code § 15-2-613(d)).

When a Beneficiary Dies Before the Testator

Idaho’s “anti-lapse” rule can save a gift for the family of a beneficiary who has died. It applies when the devisee is a grandparent of the testator or a lineal descendant of a grandparent (Idaho Code § 15-2-605).

If that devisee was already dead when the will was signed, fails to survive the testator, or is treated as having died first, the devisee’s issue (descendants) who survive the testator by 120 hours take in the devisee’s place (§ 15-2-605). If they are all in the same degree of kinship to the devisee, they take equally; if not, those of more remote degree take by representation (§ 15-2-605).

The rule also covers class gifts, such as a gift to “my nieces and nephews.” A person who would have been in the class if he or she had survived is treated as a devisee, whether that person died before or after the will was signed (Idaho Code § 15-2-605).

When a Gift Fails

If the anti-lapse rule does not apply, a failed gift is redirected as follows (Idaho Code § 15-2-606):

• A gift that is not a residuary devise, and that fails for any reason, becomes part of the residue (§ 15-2-606(a)).
• If the residue is left to two or more people and one person’s share fails for any reason, that share passes to the other residuary devisee, or to the other residuary devisees in proportion to their interests in the residue (§ 15-2-606(b)).

When Gifted Property Changes Before Death

A “specific devise” is a gift of a particular item or asset. The code has several rules for when that asset changes between the signing of the will and the testator’s death.

Stocks and Other Securities

If the testator meant to give certain securities, rather than their equivalent value, the specific devisee is entitled only to (Idaho Code § 15-2-607(a)):

• as much of the devised securities as is part of the estate at death;
• additional or other securities of the same entity owned because of action initiated by the entity, not counting any acquired by exercising purchase options;
• securities of another entity owned because of a merger, consolidation, reorganization, or similar action initiated by the entity; and
• additional securities of the entity owned through a reinvestment plan, if it is a regulated investment company.

Distributions before death on a specifically devised security that are not listed above are not part of the gift (§ 15-2-607(b)).

Property Sold, Condemned, Insured, or Foreclosed

A specific devisee has the right to whatever remains of the specifically devised property, plus (Idaho Code § 15-2-608(a)):

• any balance of the purchase price (with any security interest) still owed to the testator at death from a sale of the property;
• any condemnation award for the taking of the property that is unpaid at death;
• any fire or casualty insurance proceeds on the property that are unpaid at death; and
• property the testator owned at death as a result of foreclosure, or received in lieu of foreclosure, on the security for a specifically devised obligation.

If a conservator sold the property, or received a condemnation award or insurance proceeds for it, the specific devisee has the right to a general money gift equal to the net sale price, the award, or the proceeds (Idaho Code § 15-2-608(b)). This does not apply if it is later adjudicated that the testator’s disability has ended and the testator survives that adjudication by one year (§ 15-2-608(b)). The specific devisee’s right under this rule is reduced by any right he or she has under the list above (§ 15-2-608(b)).

Mortgages and Liens Stay With the Property

A specific devise passes subject to any security interest that exists at the date of death, such as a mortgage. The devisee has no right to have it paid off by the estate, even if the will has a general direction to pay debts (Idaho Code § 15-2-609).

Lifetime Gifts That Count Against a Will Gift

A gift the testator made during life counts against a gift in the will, in whole or in part, only in these cases (Idaho Code § 15-2-612):

• the will provides for deducting the lifetime gift;
• the testator declared in a contemporaneous writing that the gift is to be deducted from, or is in satisfaction of, the will gift; or
• the devisee acknowledged in writing that the gift is in satisfaction.

For partial satisfaction, the lifetime gift is valued when the devisee came into possession or enjoyment of it, or at the testator’s death, whichever came first (§ 15-2-612).

Family Words and Powers of Appointment

Words like “children” or “grandchildren” in a will are read using the same relationship rules that apply when there is no will. Half bloods, adopted persons, and persons born out of wedlock are included in class gifts and relationship terms under those rules (Idaho Code § 15-2-611). However, a person born out of wedlock is not treated as the child of the father unless the father openly and notoriously treated the person as his child (§ 15-2-611).

A “power of appointment” is a power the testator holds to decide who receives certain property. A general residuary clause, or a will giving away all of the testator’s property in general terms, does not exercise that power unless the will specifically refers to the power or otherwise indicates an intention to include the property subject to it (Idaho Code § 15-2-610).

Gifts to Care Facility Owners, Operators, and Employees

Idaho presumes undue influence in certain gifts to people connected with the place where the testator lived. The presumption applies to a gift of real or personal property, directly or indirectly, to anyone who owns, operates, or is employed at a nursing home, residential or assisted living facility, or any home (including the testator’s home, licensed or not) where the testator was a resident within one year of death (Idaho Code § 15-2-616). The presumption can be rebutted by clear and convincing evidence (§ 15-2-616).

The section does not limit or affect the rights of a beneficiary who is related to the testator, or who is a charitable or benevolent society or corporation (§ 15-2-616). It also does not apply to the will of a person whose death was caused by accidental means, if the will was signed before the accident (§ 15-2-616). Challenges to a will are covered in Will Contests in Idaho.

Contracts About Wills

A contract to make a will or gift, not to revoke a will or gift, or to die without a will can be established only by (Idaho Code § 15-2-701):

1. provisions of a will stating the material provisions of the contract;
2. an express reference in a will to a contract, plus outside evidence proving the contract’s terms; or
3. a writing signed by the decedent evidencing the contract.

Signing a joint will or mutual wills does not create a presumption of a contract not to revoke the will or wills (§ 15-2-701).

When There Is Not Enough to Go Around

If the estate cannot pay every gift in full, gifts are reduced (“abate”) in a set order. Unless the will says otherwise, or the stated order would defeat the testator’s plan or the purpose of a gift, and except in connection with a surviving spouse who elects to take an elective share, shares abate in this order, without preference between real and personal property (Idaho Code § 15-3-902(a), (b)):

1. property not disposed of by the will;
2. residuary devises;
3. general devises;
4. specific devises.

Within each group, gifts abate in proportion to what each beneficiary would have received under full distribution (§ 15-3-902(a)). When an estate has both separate and community property, community debts are charged to community property and separate debts to separate property (§ 15-3-902(c)). More on distribution is in Closing an Estate in Idaho.

How I Can Help

When a will’s words do not match what happened, I review the will against Idaho’s rules of construction, explain how those rules may apply to your estate or your gift, and help personal representatives and beneficiaries work through the next steps. I also help people draft wills that say clearly what they intend. 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.