Idaho Pour-Over Wills and Testamentary Trusts

Part of my Idaho Trusts Overview.

By Ronald W. Brilliant, Attorney at Law · Licensed in Idaho, Nevada & California · Last reviewed: September 2026 against the Idaho Code (Titles 15 and 68) as posted by the Idaho Legislature (July 1, 2026)

In This TopicIdaho TrustsTopic 14 of 14: Pour-Over & Testamentary

A will can leave property to the trustee of a trust, a gift the Idaho Code calls a testamentary addition to a trust (Idaho Code § 15-2-511). This page uses the common name “pour-over” for that kind of gift. The page also covers testamentary trusts, meaning trusts created by will rather than during life (see Idaho Code § 15-7-501(1)(d)), and the will-interpretation rules that affect both.

These rules matter to anyone whose estate plan pairs a will with a trust, and to personal representatives and trustees who must move property from an estate into a trust. A personal representative is the person who administers a deceased person’s estate.

Leaving Property to a Trust by Will

Under Idaho law, a will may validly devise (leave) property to the trustee of a trust that is established or will be established in either of two ways (Idaho Code § 15-2-511(1)(a)):

1. During the testator’s lifetime, by the testator, by the testator and another person, or by another person (§ 15-2-511(1)(a)(i)). This includes a funded or unfunded life insurance trust, even if the trustor has kept any or all ownership rights in the insurance contracts (§ 15-2-511(1)(a)(i)).
2. At the testator’s death, by the testator’s devise to the trustee, if the trust is identified in the will and its terms are in a written instrument other than a will, signed before, at the same time as, or after the will (§ 15-2-511(1)(a)(ii)). The terms may also be in another individual’s will if that individual died before the testator (§ 15-2-511(1)(a)(ii)).

For the second kind of trust, the statute says this works regardless of the existence, size, or character of the trust’s corpus (the property held in the trust) (§ 15-2-511(1)(a)(ii)). Separately, Idaho provides that a trust is valid and enforceable even if it holds no property at a given time (Idaho Code § 15-7-701); see trust protectors, purpose trusts, and dry trusts.

Revocable and Amended Trusts

The gift to the trust is not invalid because the trust can be amended or revoked, or because the trust was amended after the will was signed or after the testator’s death (§ 15-2-511(1)(b)).

What Happens to the Property

Unless the will says otherwise, property left to such a trust is not held under a testamentary trust of the testator (Idaho Code § 15-2-511(2)). Instead, it becomes part of the trust it was left to (§ 15-2-511(2)).

The property must be administered and distributed under the trust’s governing instrument, including any amendments made before or after the testator’s death (§ 15-2-511(2)).

If the Trust Ends Before the Testator Dies

Unless the will says otherwise, if the trust is revoked or terminated before the testator’s death, the gift to the trust lapses (fails) (Idaho Code § 15-2-511(3)). Idaho’s will-construction rules then address failed gifts; for example, a failed gift other than a residuary gift becomes part of the residue of the estate, except as provided in the anti-lapse statute (Idaho Code §§ 15-2-606(a), 15-2-605). These construction rules apply unless the will shows a contrary intention (Idaho Code § 15-2-603).

Summary Table

Situation	Rule (unless the will provides otherwise where noted)
Trust created during the testator’s life	A will may leave property to its trustee (§ 15-2-511(1)(a)(i)).
Trust identified in the will, with terms in a separate written instrument	A will may leave property to its trustee, whether the instrument is signed before, with, or after the will (§ 15-2-511(1)(a)(ii)).
Trust is revocable or amendable, or was amended later	The gift is not invalid for that reason (§ 15-2-511(1)(b)).
Property passes to the trust	It becomes part of that trust, not a testamentary trust, unless the will says otherwise (§ 15-2-511(2)).
Trust revoked or terminated before death	The gift lapses, unless the will says otherwise (§ 15-2-511(3)).

The Trustee Is the Devisee

When a will leaves property to an existing trust or trustee, or to a trust or trustee described by the will, the trust or trustee is the devisee (the recipient under the will), and the trust beneficiaries are not devisees (Idaho Code § 15-1-201(12)).

A testamentary trustee is a distributee (someone who received estate property from the personal representative) only to the extent of distributed assets, or increases on them, still in the trustee’s hands (§ 15-1-201(14)). For this purpose, “testamentary trustee” includes a trustee to whom assets are transferred by will, to the extent of the devised assets (§ 15-1-201(14)). A testamentary trust beneficiary who receives from the trustee property the trustee got from the personal representative is a distributee of the personal representative (§ 15-1-201(14)).

Moving Property From the Estate to the Trustee

Before distributing to a trustee, the personal representative may require that the trust be registered, if the state where it will be administered provides for registration (Idaho Code § 15-3-913(a)). The personal representative may also require that the trustee inform the beneficiaries as provided in Idaho Code § 15-7-303 (§ 15-3-913(a)).

If the trust instrument does not excuse the trustee from giving bond, the personal representative may ask the court to require the trustee to post bond if the personal representative fears distribution might jeopardize the interests of persons who cannot protect themselves (§ 15-3-913(b)). The personal representative may hold back distribution until the court acts (§ 15-3-913(b)). No inference of negligence may be drawn from a personal representative’s decision not to use these powers (§ 15-3-913(c)).

Registering a Testamentary Trust

The trustee of a trust whose principal place of administration is in Idaho must register the trust in the court at that place (Idaho Code § 15-7-101). A testamentary trust is identified in the registration statement by the testator’s name and the date and place of domiciliary probate (Idaho Code § 15-7-102). See trust registration and court jurisdiction for the full rules.

Agreements Among Successors

Subject to the rights of creditors and taxing authorities, competent successors may agree in a written contract, signed by all affected, to change what they receive under the will or intestacy laws (Idaho Code § 15-3-912). Trustees of a testamentary trust are successors for this purpose, but nothing in that section relieves trustees of duties owed to trust beneficiaries (§ 15-3-912). Personal representatives are not required to see to the performance of trusts if the trustee is another person willing to accept the trust (§ 15-3-912).

A compromise of a controversy about a will or a decedent’s estate, if approved by the court in a formal proceeding, is binding even though it may affect a trust (Idaho Code § 15-3-1101). The agreement may be submitted to the court for approval and for execution by, among others, the trustee of every affected testamentary trust (Idaho Code § 15-3-1102(b)). Disputes involving trusts and estates can also be handled under Idaho’s Trust and Estate Dispute Resolution Act (TEDRA) (Idaho Code § 15-8-101).

Will Rules That Affect Trust Planning

Several of Idaho’s will provisions bear on wills that work together with trusts. The testator’s intention, as expressed in the will, controls the legal effect of the will’s gifts (Idaho Code § 15-2-603).

• Incorporation by reference: A writing that exists when a will is signed may be incorporated into the will if the will’s language shows this intent and describes the writing well enough to identify it (Idaho Code § 15-2-510).
• Events of independent significance: A will may dispose of property by reference to acts and events that have significance apart from their effect on the will, whether they happen before or after the will is signed or the testator dies (Idaho Code § 15-2-512).
• All property passes: A will is construed to pass all property the testator owns at death, including property acquired after the will was signed (Idaho Code § 15-2-604).
• Powers of appointment: A general residuary clause, or a will disposing of all the testator’s property, does not exercise a power of appointment the testator holds unless it specifically refers to the power or otherwise shows an intention to include the property subject to it (Idaho Code § 15-2-610).
• Divorce: Unless the will expressly says otherwise, a divorce or annulment after the will is signed revokes the will’s nomination of the former spouse as trustee, along with gifts to the former spouse and other listed provisions (Idaho Code § 15-2-508).
• Simultaneous death: Idaho’s simultaneous death rules do not apply to wills, living trusts, deeds, or insurance contracts that provide for a different distribution (Idaho Code § 15-2-613(d)).

Other Trust Provisions That Can Be in a Will

• A will may incorporate, by appropriate reference and clearly expressed intention, any of the trust protector powers listed in Idaho Code § 15-7-501(6), as they exist when the will is signed (Idaho Code § 15-7-501(8)).
• For the trust protector and advisor rules, “instrument” includes any revocable or irrevocable trust document, whether created during life or by will (§ 15-7-501(1)(d)).
• A trust for a charitable or noncharitable purpose may be created under a will (Idaho Code § 15-7-601(1)).

Court Permission to Deviate

The court may direct or permit a trustee under a testamentary or nontestamentary instrument to renounce or deviate from a power of administration, management, or allocation of benefit (Idaho Code § 15-2-801(1)(c)). The court must first find that using the power may defeat or impair the trust’s purposes, whether through taxes or an allocation of benefits inconsistent with those purposes (§ 15-2-801(1)(c)). This happens after a hearing, with notice to all known persons beneficially interested in the trust or estate (§ 15-2-801(1)(c)).

For the formal requirements for signing a valid will, see making a valid will in Idaho. For more rules on reading a will, see how Idaho wills are interpreted.

How I Can Help

I can review how your will and trust fit together under Idaho law, explain what happens to property left to a trust, and help personal representatives and trustees understand the steps for moving estate property into a trust. Request a consultation to discuss your situation.

This page provides general information about Idaho trust law, 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.