Grantor, Settlor, Trustor: What the Terms Mean and Why They Are Not Interchangeable Across Contexts

Jurisdiction: Federal; California Primary Statutes: Cal. Prob. Code §§ 15000–15004 (creation), 15400–15404 (revocation and amendment), 15800; I.R.C. §§ 671–679 (grantor trust rules); Treas. Reg. § 1.671-1 et seq. Last Reviewed: 2026 Category: Trust Law | Income Tax | Estate Planning Fundamentals

Executive Summary

Grantor, settlor, and trustor all mean the person who creates a trust — the one who decides what the trust says, contributes property to fund it, and designates who benefits from it. In everyday usage, the three terms are interchangeable. In legal usage, which term applies depends on which body of law you are reading.

California’s Probate Code, which governs how trusts are created, amended, revoked, and administered, uses “settlor” throughout its trust provisions (Division 9, §§ 15000 et seq.), though “trustor” also appears and is treated as synonymous. Federal income tax law — specifically the grantor trust rules of I.R.C. §§ 671–679 — uses “grantor” exclusively, and that term has a precise technical meaning that extends beyond trust creation to define income tax responsibility. Trust instruments in California practice commonly use “settlor” or “trustor,” and some use all three terms in the same document.

The practical significance of these distinctions becomes apparent in four areas: (1) which term determines who holds statutory rights under California law; (2) what “grantor trust” status actually means for income tax purposes, and why it is not synonymous with “revocable trust”; (3) what the grantor/settlor can and cannot do during their lifetime, and what statutory authority governs those powers; and (4) what happens when the settlor loses capacity — a more common triggering event in practice than death, and one the original article ignored entirely.

Governing Law

California Probate Code: “Settlor”

Division 9 of the California Probate Code, which governs the creation, validity, modification, and termination of trusts, uses “settlor” as its primary term for the trust creator throughout. Key provisions include:

• § 15000: The settlor’s intent to create a trust governs construction of the trust instrument.
• § 15400: A trust is presumed revocable unless the instrument expressly makes it irrevocable. The settlor holds the revocation power.
• § 15401: The settlor may revoke the trust by a writing signed by the settlor (or by the settlor’s agent under a durable power of attorney, if the power expressly authorizes revocation of trusts). Revocation takes effect when received by the trustee.
• § 15402: Unless the instrument provides otherwise, the settlor may modify a revocable trust by the same procedure used to revoke it.
• § 15800: While a trust is revocable, the rights of a beneficiary are subject to the control of the settlor — meaning a competent settlor’s instructions to the trustee supersede the trustee’s ordinary duties to beneficiaries. The trustee’s obligation runs to the settlor, not to the remainder beneficiaries, during the settlor’s lifetime.

“Trustor” also appears in certain Division 9 provisions — notably § 17204(b)(3), which uses “trustor” in defining standing for creditors of a trust that has become irrevocable upon the death of a trustor, and § 16061.7, which references the trustor’s death as the trigger for the successor trustee’s notification obligations. In both sections the term is used interchangeably with “settlor” as applied elsewhere in the same statute. The key provisions governing creation, revocation, amendment, and administration — §§ 15400–15402 and 15800 — use “settlor” exclusively. You will see both terms in California instruments and case citations; neither is wrong, but if you are looking for the term the statute actually uses in the provisions that govern day-to-day trust administration, it is “settlor.”

Federal Tax Law: “Grantor”

The Internal Revenue Code uses “grantor” throughout its trust income tax provisions, I.R.C. §§ 671–679. Under this framework, a “grantor trust” is not simply a trust the grantor created — it is a trust in which the grantor (or another specified person) is treated as the owner of trust assets for income tax purposes, and therefore taxed on the trust’s income as if the assets were never transferred.

Grantor trust status arises when the grantor (or another person) retains certain powers or interests over the trust, including:

• § 673: A reversionary interest whose present value exceeds 5% of the trust’s value
• § 674: A power to control beneficial enjoyment of trust income or principal
• § 675: Certain administrative powers (e.g., the ability to purchase trust assets for less than full consideration)
• § 676: A power to revoke
• § 677: A power to benefit the grantor or the grantor’s spouse from trust income
• § 678: A power held by a person other than the grantor to withdraw trust corpus (making that person — not the grantor — the “owner” for income tax purposes)

The IRS also uses “grantor” in EIN-related contexts: a revocable grantor trust uses the settlor’s Social Security number during the settlor’s lifetime; it does not obtain a separate EIN until it becomes irrevocable (typically at death), at which point the trustee files Form SS-4.

Trust Instruments in Practice

California trust instruments — including virtually every revocable living trust produced by estate planning attorneys — commonly use “settlor” or “trustor,” and many define the term at the outset: “The person creating this trust is referred to as the ‘Settlor.’” Some instruments use “Grantor” for clients who have encountered that term in prior tax planning contexts. The choice is a drafting convention, not a legal requirement. What matters is that the instrument defines the term used and uses it consistently.

📌 PLANNING NOTE: When a client brings in an existing trust from another state, confirm which term the instrument uses and how it is defined. This matters most when the trust instrument grants or restricts specific powers by reference to “the settlor” or “the grantor” — a power granted to “the settlor” does not automatically extend to a person the instrument calls “the trustor” in a different provision, though in practice courts will look to intent.

Grantor Trust ≠ Revocable Trust

Grantor trust status is a federal income tax concept that does not map directly onto revocability under state law.

A revocable living trust is a grantor trust — the settlor retains the power to revoke under § 676, which alone causes grantor trust treatment. But the converse is not true: an irrevocable trust can also be a grantor trust, and frequently is by design.

The Intentionally Defective Grantor Trust (IDGT) is the clearest example. An IDGT is structured to be irrevocable and outside the settlor’s taxable estate for estate tax purposes — the transfer is a completed gift — but simultaneously treated as the grantor’s property for income tax purposes, because the grantor retained one or more of the powers enumerated in §§ 673–677. The grantor pays income tax on trust earnings as if they still owned the assets, effectively making an additional untaxed wealth transfer to the trust beneficiaries over time (because the grantor’s payment of trust income tax is not itself a taxable gift).

The practical significance: when a client or colleague says “it’s a grantor trust,” that does not tell you whether the trust is revocable or irrevocable. It tells you who pays the income tax. The two questions — revocability under state law, and income tax treatment under federal law — must be analyzed separately.

What changes grantor trust status:

For a revocable living trust, grantor trust status ends when grantor trust status-causing powers are eliminated. The most common scenario is the settlor’s death: at death, the power to revoke is extinguished, the trust becomes irrevocable, and grantor trust status under § 676 ends. The trust then becomes a separate taxpayer, obtains an EIN, and files Form 1041 going forward.

For an IDGT, grantor trust status can be terminated during the settlor’s lifetime by releasing or modifying the retained power — but doing so may have gift tax consequences if the release constitutes a completed gift to the trust beneficiaries.

What the Settlor Can and Cannot Do: The Retained Powers Framework

The original article stated that the settlor “retains full control” of a revocable living trust. This is substantially accurate but imprecise in ways that matter.

What the settlor can do:

Under Cal. Prob. Code § 15400, a revocable trust is — by default — fully revocable. The settlor can:

• Revoke the trust entirely (§ 15401)
• Amend or restate the trust (§ 15402)
• Withdraw assets from the trust
• Replace the trustee
• Change beneficiaries
• Change distribution terms

These powers can be restricted by the trust instrument. Most instruments do restrict them procedurally — requiring a written amendment signed by the settlor, for example — but the substantive powers remain.

What the settlor cannot do:

The settlor cannot unilaterally terminate the trust if it has become irrevocable — for example, after the settlor has executed an irrevocable trust, or after the first spouse’s death in a joint trust that bifurcates into revocable and irrevocable shares. Modification of an irrevocable trust requires either consent of all beneficiaries (§ 15403), petition to the court (§ 15404), or one of the statutory modification procedures introduced by California’s adoption of the Uniform Trust Code provisions.

The settlor also cannot change beneficiary designations on accounts held outside the trust — retirement accounts, life insurance, POD/TOD accounts — through the trust instrument. Those designations are governed by the account agreement and must be changed directly with the financial institution.

⚠️ CRITICAL ISSUE: The § 15800 rule — that the trustee’s duties run to the settlor during the settlor’s lifetime, not to the remainder beneficiaries — has a significant implication at incapacity. When the settlor loses capacity and can no longer exercise the revocation power, § 15800 no longer shields the trustee from duties to beneficiaries in the same way. The trust does not automatically convert to irrevocable at incapacity, but the settlor’s ability to direct the trustee is suspended, and beneficiaries may acquire rights to information they did not previously have. See below.

What Happens When the Settlor Loses Capacity

The original article moves directly from the settlor’s lifetime to the settlor’s death. In practice, incapacity is an equally — and often more — significant event. It is more common, more gradual, more contested, and requires a different legal analysis than death.

The successor trustee steps in. Most revocable living trusts provide that the successor trustee assumes administration when the settlor becomes incapacitated, as determined by one or more physicians’ certifications. Until incapacity is established under the procedure specified in the trust instrument, the original trustee (typically the settlor) remains in office.

Grantor trust status continues. The settlor is still alive. The powers that cause grantor trust treatment under §§ 671–679 — including the power to revoke under § 676 — have not been extinguished; the settlor simply cannot exercise them. The trust therefore remains a grantor trust, continues to use the settlor’s Social Security number, and the settlor (or their estate, if income is earned and the settlor dies before filing) remains responsible for income tax on trust earnings.

The revocation and amendment powers are suspended, not eliminated. The settlor’s incapacity prevents exercise of the revocation and amendment powers, but does not terminate them. An agent under a durable power of attorney may be authorized to revoke or amend the trust on the settlor’s behalf — but only if (a) the durable power expressly grants that authority, and (b) the trust instrument expressly permits amendment by an attorney-in-fact. Under Cal. Prob. Code § 15401(b), a trust may be revoked by the settlor’s agent under a power of attorney “if the power of attorney expressly provides for this authority.” Both documents must be aligned; the power alone is not sufficient if the trust is silent.

⚠️ COMMON ERROR: A client brings in a durable power of attorney that grants broad financial powers to an agent, and a revocable living trust that is silent on whether the attorney-in-fact may amend or revoke it. The client assumes — and the agent assumes — that the broad POA covers the trust. It does not. Under § 15401(b), the trust cannot be revoked by the agent unless the POA expressly provides for it. Amendment is governed by § 15402, which incorporates the § 15401 procedure. If either document is silent, the agent’s hands are tied. This coordination failure is one of the most frequently encountered problems in existing estate plans and should be checked at every trust review.

Beneficiary rights at incapacity: Cal. Prob. Code § 15800.

§ 15800 provides that while a trust is revocable, the rights of beneficiaries are subject to the settlor’s control. As long as a competent settlor exists, the trustee’s duties run primarily to the settlor rather than to remainder beneficiaries — meaning the trustee is not obligated to provide trust accountings or information to remainder beneficiaries during the settlor’s competency.

When neither settlor is competent (or when one is deceased and the survivor is incapacitated, in the case of a joint trust), § 15800’s protection falls away. Effective January 1, 2022, amended § 15800 requires the trustee to provide a copy of the trust to all beneficiaries who would be entitled to receive distributions if the trust became irrevocable at that moment. The trustee must also provide accountings on request. This is a significant shift for families with joint trusts in which one or both spouses are incapacitated and a successor trustee — often a child — is managing trust assets for parents who can no longer exercise oversight.

One Person in Multiple Roles

The settlor of a revocable living trust typically serves simultaneously as:

• Settlor — creates the trust and defines its terms
• Trustee — manages trust assets during their lifetime
• Beneficiary — receives income and has the right to use trust assets

This three-way identity is unremarkable for a revocable living trust and creates no legal conflict, because the settlor’s power to revoke encompasses all three roles. The settlor can change anything, at any time, for any reason.

The analysis changes when the roles diverge — which happens in three common scenarios:

1. Third-party trusts. A parent who creates and funds a trust for a child is the settlor and the trustee (initially), but not the beneficiary. The parent’s retained powers, if any, are analyzed under the grantor trust rules to determine income tax treatment. If the parent retains no enumerated power, the trust is a non-grantor trust — a separate taxpayer — even if the parent remains trustee. The parent’s role as trustee does not by itself create grantor trust status.

2. Joint trusts. A married couple who creates a single joint trust are both settlors. Both contribute property — community property, separate property, or both — and both hold revocation rights over their respective contributions. At the first death, the surviving spouse’s power to revoke the survivor’s share continues; the deceased spouse’s share typically becomes irrevocable (or partially so). Grantor trust status for the deceased spouse’s share ends at death; for the surviving spouse’s share, it continues. This bifurcation has income tax, estate tax, and administration consequences that require attention at the first death.

3. Irrevocable trusts with retained powers. A settlor who creates an irrevocable trust — a GRAT, a QPRT, an IDGT — retains specific enumerated powers by design. The settlor is not the trustee and not the beneficiary in the conventional sense, but remains the “grantor” for income tax purposes because of the retained power. The label in the trust instrument (“grantor,” “settlor,” or “trustor”) is irrelevant to this determination; the IRC §§ 671–679 analysis looks at the substance of what was retained, not what the document calls the person.

Summary Table

NOT LEGAL ADVICE. This article is prepared for professional reference and educational purposes only. It does not constitute legal advice and does not create an attorney-client relationship. Legal and tax professionals must conduct their own independent research and due diligence before relying on any analysis contained in this article. Laws, regulations, and administrative interpretations are subject to change. Application of these principles to specific facts requires professional judgment that this article cannot substitute for.