A trust is a grantor trust when its creator keeps one of the powers listed in Internal Revenue Code Sections 671 through 679, which cause the trust’s income to be taxed to that person rather than to the trust itself. What makes a trust a grantor trust is not the label on the document but the presence of any single triggering power, from the ability to revoke the trust outright to subtler controls like swapping assets, directing who receives income, or (for foreign trusts) simply transferring property when a U.S. beneficiary exists. Only one of these powers is needed. The rest of the document can look entirely irrevocable and the trust will still be a grantor trust for income tax purposes.
The Look-Through Rule
Section 671 sets the mechanism. When any provision in Sections 671 through 679 treats the grantor as the owner of a trust or any portion of it, the trust’s income, deductions, and credits flow directly to the grantor’s personal return.1Office of the Law Revision Counsel. 26 USC 671 – Trust Income, Deductions, and Credits Attributable to Grantors and Others as Substantial Owners The trust still exists as a legal entity. For federal income tax purposes, the IRS looks through it and taxes the grantor as if they still owned the assets outright.2Internal Revenue Service. Abusive Trust Tax Evasion Schemes – Questions and Answers
Grantor trust status can apply to the whole trust or only to the portion connected to the retained power. Several powers can apply at once, but only one is needed to trigger the classification.
The Powers That Trigger Grantor Trust Status
Each triggering power sits in its own section of the code. Some are used deliberately by estate planners; others catch people off guard.
The Power to Revoke
The simplest trigger. If the grantor (or any person who wouldn’t be harmed by the revocation) can cancel the trust and reclaim the property, the grantor is the tax owner.3Office of the Law Revision Counsel. 26 USC 676 – Power to Revoke Every revocable living trust falls here automatically. The grantor can undo the trust at any time, so the IRS sees no meaningful transfer of ownership.
A Reversionary Interest Worth More Than 5%
A reversionary interest exists when the trust property might eventually come back to the grantor. If the value of that potential return exceeds 5% of the trust’s value at the time the trust is created, the grantor is treated as the owner of that portion. The IRS values the interest by assuming any discretionary decisions will be made in the way most favorable to the grantor. One narrow exception: if the trust benefits a lineal descendant of the grantor who holds all present interests, a reversion that takes effect only if that beneficiary dies before age 21 does not trigger grantor trust status.4Office of the Law Revision Counsel. 26 USC 673 – Reversionary Interests
Control Over Who Benefits
Section 674 sweeps broadly. If anyone other than an adverse party can decide who receives trust income or principal, and when, the grantor is the tax owner.5Office of the Law Revision Counsel. 26 USC 674 – Power to Control Beneficial Enjoyment This is the section estate planners sometimes rely on when they want an irrevocable trust that still qualifies as a grantor trust.
Section 674 also carries the most exceptions. A power to distribute principal under a reasonably definite standard set out in the trust document does not trigger grantor status. Neither does a power exercisable only through the grantor’s will, or a power to allocate assets among charitable beneficiaries. These carve-outs let drafters build flexibility into a trust without accidentally creating grantor status.5Office of the Law Revision Counsel. 26 USC 674 – Power to Control Beneficial Enjoyment
Certain Administrative Powers
Some administrative controls trigger grantor status even when they don’t affect who ultimately receives the money. Section 675 identifies four:6Office of the Law Revision Counsel. 26 USC 675 – Administrative Powers
- Dealing for less than fair value. The grantor or a friendly party can buy, exchange, or otherwise deal with trust assets without paying full market price.
- Borrowing without adequate terms. The grantor can borrow from the trust without paying fair interest or providing proper security. A general lending power held by an independent trustee does not count.
- Outstanding loans from the trust. The grantor has already borrowed trust assets and hasn’t fully repaid by the start of the tax year. This rule doesn’t apply if an independent trustee made the loan on standard commercial terms.
- The substitution power. Anyone, acting in a non-fiduciary capacity and without needing approval from a fiduciary, can swap trust assets for other property of equal value, control the voting of significant stock holdings, or direct investment decisions.
The substitution power is the one estate planners rely on most often. Including it in an irrevocable trust is a well-established way to maintain grantor trust status for income tax purposes without giving the grantor enough control to pull the assets back into the taxable estate.
Income That Can Flow to the Grantor or Spouse
If trust income can be distributed to the grantor or the grantor’s spouse, accumulated for future distribution to either of them, or used to pay premiums on life insurance policies covering either of them, the grantor is the tax owner of that portion.7Office of the Law Revision Counsel. 26 USC 677 – Income for Benefit of Grantor Actual payment is not required. The mere possibility is enough.
There is a narrow exception for support. Income that can be used to support someone the grantor is legally obligated to support, such as a minor child, does not by itself make the trust a grantor trust. But if the income is actually spent on that support, the grantor is taxed on the amounts used.7Office of the Law Revision Counsel. 26 USC 677 – Income for Benefit of Grantor
Transfers to Foreign Trusts
Section 679 works differently from the rest. It doesn’t ask what powers the grantor kept. If a U.S. person transfers property to a foreign trust that has any U.S. beneficiary, the transferor is automatically treated as the owner of the portion of the trust tied to that transfer.8Office of the Law Revision Counsel. 26 USC 679 – Foreign Trusts Having One or More United States Beneficiaries The rule applies even if the grantor gave up every shred of control. Two exceptions: transfers at death and sales at fair market value. Any offshore trust structure with a U.S. beneficiary is caught by this section whether the grantor wants grantor trust treatment or not.
When a Beneficiary Becomes the Owner Instead
Grantor trust status doesn’t always fall on the person who created the trust. Under Section 678, a beneficiary who holds the sole power to withdraw trust assets or income for their own benefit can be treated as the tax owner of that portion, even though they aren’t the grantor.9Office of the Law Revision Counsel. 26 USC 678 – Person Other Than Grantor Treated as Substantial Owner This comes up most often with Crummey withdrawal powers, where beneficiaries get temporary rights to pull out contributions made to the trust.
Section 678 has an ordering rule. If the actual grantor is already treated as the owner under any of the other provisions, the grantor’s status takes priority and the beneficiary’s withdrawal power doesn’t override it.9Office of the Law Revision Counsel. 26 USC 678 – Person Other Than Grantor Treated as Substantial Owner A beneficiary can also avoid owner status by renouncing or disclaiming the power within a reasonable time after learning it exists.
Why the Classification Matters
The practical effect is direct. The grantor pays income tax on everything the trust earns, whether or not any of that income reaches the grantor’s bank account. All income, deductions, and credits flow through to the grantor’s Form 1040.2Internal Revenue Service. Abusive Trust Tax Evasion Schemes – Questions and Answers
For a revocable living trust, this is a neutral continuation of the status quo. For an irrevocable trust, it can be a deliberate advantage, and the reason is bracket compression. Trusts and estates that pay their own income tax reach the top federal rate of 37% once taxable income exceeds just $16,000 in 2026.10Internal Revenue Service. 2026 Form 1041-ES An individual filing single doesn’t reach that same 37% rate until income exceeds $640,600.11Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 By keeping grantor trust status, a trust’s income gets taxed at the grantor’s individual rates. The grantor effectively subsidizes the trust’s tax bill, letting the assets inside grow faster for the beneficiaries.
Grantor trust status also makes transactions between the grantor and the trust tax non-events. If a grantor sells appreciated stock to their own grantor trust, there is no capital gain to report. The IRS treats it as a sale from the grantor to themselves. Interest on a note between the two is likewise ignored for income tax purposes. This is what allows grantor trusts to move appreciating assets out of the taxable estate without triggering a current tax bill.
This is also why estate planners sometimes design an irrevocable trust to be “intentionally defective.” The trust is irrevocable, so the assets are out of the grantor’s taxable estate. But a triggering power (often the substitution power under Section 675, or a provision under Section 677) is deliberately built in so the grantor keeps paying the trust’s income taxes.
One Trap to Know Before You Assume Full Tax Benefit
Grantor trust status does not guarantee a stepped-up basis at death. Under Section 1014, property acquired from a decedent generally receives a new cost basis equal to fair market value at the date of death, eliminating built-up capital gains.12Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent In Revenue Ruling 2023-2, the IRS confirmed that assets held in an irrevocable grantor trust that are not included in the grantor’s gross estate do not qualify for this basis adjustment.13Internal Revenue Service. Internal Revenue Bulletin 2023-16 The assets keep their old basis, and beneficiaries who later sell them can owe capital gains tax they would have avoided if the property had stayed in the estate.
Revocable trusts don’t have this problem because their assets are included in the gross estate. The ruling targets irrevocable grantor trusts designed to remove assets from the estate while keeping the income tax benefits of grantor trust status.