What Are the Grantor Trust Rules Under IRC 671–679?

The grantor trust rules, set out in Internal Revenue Code sections 671 through 679, decide when the person who created a trust is taxed on the trust’s income as if the trust assets were still personally owned. When any of these sections applies, every dollar of the trust’s income, deductions, and credits lands on the grantor’s individual return, and the trust itself owes no federal income tax.¹ Whether a trust falls into this treatment turns on specific powers or interests the grantor kept when the trust was set up. The list of triggers is finite, but it is broad, and one is often enough.

What Grantor Trust Status Actually Does

The core mechanic is transparency. The trust exists as a legal entity, but for federal income tax purposes it is treated as owned by the grantor, in whole or in part. The grantor picks up the income, claims the deductions, and takes the credits. The trust files no separate income tax return on that portion, or files a stripped-down informational return.

When an entire trust is treated as owned by one grantor, the trustee has two simplified alternatives to filing a full Form 1041.² Under direct reporting, sometimes called the 1040 method, the trustee gives all payors the grantor’s name and Social Security number, income documents come in under the grantor’s name, and the grantor reports everything on the personal return. Under the alternate 1099 method, the trustee uses the trust’s own EIN, then issues Forms 1099 showing the trust as payor and the grantor as payee. Many revocable living trusts use direct reporting throughout the grantor’s life. From the IRS’s perspective, the trust is essentially invisible.

Who Counts: Adverse, Nonadverse, and Related or Subordinate Parties

Almost every trigger in sections 673 through 677 turns on who holds the power in question. Section 672 defines the categories.

An adverse party is someone with a real financial stake in the trust that would be hurt if a particular power were exercised, typically a beneficiary who would lose an interest if the grantor reclaimed assets. A power held exclusively by an adverse party almost never triggers grantor trust status.³

A nonadverse party is everyone else: any person who does not hold a substantial beneficial interest that would be harmed by the power. A power held by a nonadverse party is treated almost the same as if the grantor held it, because nothing stops that person from doing what the grantor wants.

Inside the nonadverse category sits a narrower group, related or subordinate parties. That group includes the grantor’s spouse (if living with the grantor), parents, children and other descendants, siblings including half-siblings, the grantor’s employees, and employees of a corporation where the grantor and trust together hold significant voting control.³ These people are presumed to be subservient to the grantor’s wishes unless proven otherwise by a preponderance of the evidence. Nieces, nephews, cousins, grandparents, and in-laws are not on the list. They can still be nonadverse, but they do not carry the automatic presumption.

Spousal Attribution

One provision in section 672 shuts down a whole category of workaround. Under section 672(e), any power or interest held by the grantor’s spouse is treated as held by the grantor.³ This covers a spouse at the time the power was created and a person who married the grantor later, for periods after the marriage. Giving a problematic power to a spouse instead of the grantor accomplishes nothing. A spouse legally separated under a divorce or separate maintenance decree is no longer treated as married for this purpose.

Reversionary Interests (Section 673)

A reversionary interest means the trust property could eventually come back to the grantor or the grantor’s spouse. If the actuarial value of that potential return exceeds 5% of the value of the relevant trust portion when the trust was created, the grantor is treated as the owner of that portion.⁴ Discretion, when it exists, must be assumed to be exercised in the way most favorable to the grantor for purposes of the calculation.

A narrow exception protects trusts for young family members. If the reversion would only kick in on the death of a beneficiary who is a lineal descendant of the grantor and who holds all the present interests in that portion, the 5% test does not apply while the beneficiary is under 21.⁴ Without that carve-out, standard trusts for minor children would routinely trip the rule simply because young beneficiaries have a real actuarial chance of dying before adulthood.

Power to Control Beneficial Enjoyment (Section 674)

Section 674 is the broadest trigger. If the grantor or a nonadverse party holds any power to control who benefits from the trust, how much they receive, or when they receive it, the grantor is treated as the owner. If you can redirect the money, you haven’t really given it away.⁵

Because the general rule would swallow every discretionary trust, the statute carves out exceptions:

A power exercisable only through the grantor’s will does not trigger the rule, because it cannot redirect benefits during life.
A power to distribute principal is safe if constrained by an ascertainable standard such as health, education, support, or maintenance. Practitioners call this a HEMS standard, and it is one of the most common drafting tools in trust practice.⁵
A power to accumulate income is permitted as long as the accumulated income must ultimately be paid to the current income beneficiary, that beneficiary’s estate, or that beneficiary’s appointees.
A trustee who is neither the grantor nor part of a group where more than half are related or subordinate parties subservient to the grantor may hold broad discretionary powers, including allocating income and principal among a class of beneficiaries, without causing grantor trust status.⁵

The independent trustee exception gives real flexibility. A grantor willing to hand actual authority to an unrelated third party can build a trust with discretionary provisions that would otherwise be fatal. The independence has to be genuine, not just on paper.

Administrative Powers (Section 675)

Section 675 targets powers that look administrative on their surface but let the grantor treat trust property as personal property. The statute lists four specific triggers, and each one benefits the grantor rather than the beneficiaries.⁶

Dealing for less than full value. If the grantor or a nonadverse party can buy, exchange, or otherwise deal with trust assets for less than fair market value, the grantor is treated as the owner.
Borrowing without adequate terms. A power letting the grantor borrow trust assets or income without paying adequate interest or providing adequate security triggers the rule. An exception applies if a non-grantor, non-subordinate trustee holds a general lending authority allowing loans to anyone on the same terms.
Outstanding loans. If the grantor has actually borrowed from the trust and has not fully repaid (including interest) before the start of the taxable year, grantor trust status is triggered for that year. This does not apply if the loan carries adequate interest and security and was made by an independent trustee.⁶
Non-fiduciary administrative control. If anyone holds an administrative power in a non-fiduciary capacity without needing approval from someone acting as a fiduciary, the rule is triggered. This category covers three specific powers: voting or directing the vote of stock in a corporation where the grantor and trust together hold significant voting control, controlling trust investments in that same corporate stock, and the power to reacquire trust assets by substituting other property of equivalent value.⁶

The substitution power is used deliberately in modern estate planning. Swapping assets of equal value in and out of the trust lets the grantor manage the income tax basis of trust assets without changing total value, which is the engine behind the intentionally defective grantor trust discussed below. For the power to work without raising IRS scrutiny, the trustee must have a fiduciary duty to verify that substituted property truly has equivalent value.

Power to Revoke (Section 676)

Section 676 is the simplest trigger. If the grantor or a nonadverse party can take back the trust property, the grantor is the owner for tax purposes. This is precisely what makes a revocable living trust a grantor trust. As long as the transfer can be undone, the trust provides no income tax separation.⁷

The power need not be absolute. It can be held jointly with a nonadverse party and still count. If the revocation power is contingent on an event that hasn’t happened yet, and the delay is long enough that a reversionary interest in the same position would fall under the 5% threshold in section 673, the grantor isn’t treated as the owner until that event occurs.⁷ Once the triggering event happens, grantor trust status kicks in unless the power has been relinquished.

Income for the Benefit of the Grantor (Section 677)

Section 677 catches situations where trust income can flow back to the grantor or the grantor’s spouse, even indirectly. The grantor is treated as the owner of any trust portion whose income, without requiring an adverse party’s consent, can be distributed to the grantor or spouse, accumulated for future distribution to either of them, or used to pay premiums on life insurance covering either of them.⁸ The mere possibility is enough. Actual distribution is not required.

The insurance premium trigger catches a scenario that trips up many planners. If trust income can be used to pay premiums on the grantor’s life insurance, the grantor is taxed on that income regardless of who owns the policy. The only exception is for policies irrevocably designated for charitable purposes under section 170(c).⁸

A separate rule applies when trust income is used to discharge someone the grantor is legally obligated to support. Unlike the general rule, this provision taxes the grantor only on amounts actually applied toward the support obligation, not on amounts that merely could be used that way.⁸ What counts as a legal support obligation is determined by state law, which varies considerably on questions like a parent’s duty to support adult children.

When Someone Other Than the Grantor Is Treated as Owner (Section 678)

Section 678 extends the grantor trust concept to a non-grantor. If any person holds a power, exercisable solely by that person, to take the trust’s income or principal for themselves, that person is treated as the owner of the portion subject to the power.⁹ The non-grantor then reports the trust’s income on the personal return, just as a grantor would.

This most commonly arises with Crummey withdrawal powers. A Crummey power gives a beneficiary a temporary right, typically 30 to 60 days, to withdraw a contribution made to the trust. While the withdrawal window is open, the beneficiary is treated as the owner of the contributed amount. For 2026, the annual gift tax exclusion is $19,000 per recipient, and Crummey powers are typically set at that amount to qualify each contribution as a present-interest gift.¹⁰

When a beneficiary lets a Crummey power expire without withdrawing, the lapse can be treated as a release, meaning the beneficiary may continue to be treated as owner. The tax code limits this through the 5-and-5 rule: a lapse is treated as a release only to the extent it exceeds the greater of $5,000 or 5% of the trust’s assets.¹¹ Any lapse inside that safe harbor is ignored. If a lapse exceeds the limit, the beneficiary is treated as having made a deemed transfer to the trust, and section 678(a)(2) treats them as continuing to own the portion attributable to the excess.

A priority rule prevents double taxation. If the original grantor is already treated as the trust’s owner under sections 671 through 677, the grantor takes precedence and the non-grantor beneficiary is not treated as owner.⁹

Foreign Trusts With U.S. Beneficiaries (Section 679)

Section 679 is a blunt anti-abuse rule aimed at offshore planning. A U.S. person who transfers property to a foreign trust is treated as the owner of the transferred portion if the trust has even one U.S. beneficiary, regardless of whether the transferor retained any of the powers described in sections 673 through 677.¹² The retained-power analysis that drives the rest of the grantor trust rules is bypassed entirely.

A trust is treated as having a U.S. beneficiary unless its terms specifically prohibit any distribution of income or principal to a U.S. person and no such distribution is ever actually made. If a foreign trust that previously had no U.S. beneficiaries later acquires one, the U.S. transferor is treated as receiving a distribution equal to the trust’s accumulated undistributed income at that point.

Section 679 also carries substantial reporting obligations. U.S. persons who create or transfer property to a foreign trust must file Form 3520, and a foreign trust with a U.S. owner must file Form 3520-A.¹³ Penalties for missing these filings begin at the greater of $10,000 or a percentage of the unreported amount (35% for unreported contributions and distributions, 5% for unreported ownership or trust assets), and continue to accrue at $10,000 per 30-day period once the IRS has issued a notice.¹⁴ The penalties can stack quickly and in some cases approach the full value of the trust.

Why Planners Trigger These Rules on Purpose

The grantor trust rules are usually presented as traps, but estate planners often trigger them deliberately using an intentionally defective grantor trust, or IDGT. The strategy exploits the fact that the income tax rules and the estate tax rules operate independently. A trust can be structured so the grantor is treated as owner for income tax purposes under sections 671 through 679 while the transfer is a completed gift excluded from the grantor’s taxable estate by avoiding sections 2036 and 2038.

The most common trigger is the power to substitute assets of equivalent value under section 675(4)(C).⁶ The grantor keeps the ability to swap assets in and out of the trust, which triggers grantor trust status. Because the substitution must be for equivalent value, the beneficiaries’ economic interests are not diminished, so the grantor has not retained the kind of enjoyment or control that would pull the assets back into the estate under section 2038.¹⁵ Other common triggers include the power to borrow from the trust without adequate security under section 675(2).

The tax advantages are real. Because the grantor pays the trust’s income tax, the trust’s assets grow without being diminished by tax payments, effectively giving the beneficiaries an additional tax-free gift each year. Transactions between the grantor and the trust are disregarded for income tax purposes, so the grantor can sell appreciated assets to the trust without recognizing capital gain. The trust pays the grantor with a promissory note, and the appreciation eventually passes to the beneficiaries free of income tax.

There is a trade-off on basis. In Revenue Ruling 2023-2, the IRS concluded that assets in an irrevocable grantor trust that are not included in the grantor’s gross estate do not qualify for a section 1014 basis step-up at the grantor’s death, because those assets were not acquired or passed from the decedent. Planners sometimes address this by using the substitution power late in life to swap low-basis assets out of the trust and replace them with high-basis assets, so the low-basis assets end up in the estate and eligible for a step-up.

What Happens When the Grantor Dies

The grantor’s death is the most disruptive event in a grantor trust’s tax life. Grantor trust status ends because the person whose powers or interests caused it no longer exists. The trust can no longer report under the grantor’s Social Security number and must obtain its own EIN. Going forward, it files Form 1041 as a separate taxpayer under the compressed trust income tax brackets.

For revocable trusts, the executor and trustee can jointly elect under section 645 to treat the trust as part of the decedent’s estate for income tax purposes.¹⁶ The election is irrevocable and must be made by the due date, including extensions, of the estate’s first income tax return. Combined treatment lasts until two years after the date of death if no estate tax return is required, or six months after the final determination of estate tax liability if one is. During that period, the trust and estate file a single return, which can simplify administration and open up elections available only to estates.

Whether trust assets get a stepped-up basis at death depends on whether they are included in the grantor’s gross estate. For revocable trusts, assets are typically included under section 2038 because the grantor retained the power to alter, amend, or revoke.¹⁵ Those assets receive a new basis equal to fair market value at death under section 1014. Assets in an irrevocable grantor trust that are outside the gross estate do not, as noted above.

1
Office of the Law Revision Counsel. 26 USC 671 – Trust Income, Deductions, and Credits Attributable to Grantors and Others as Substantial Owners
2
eCFR. 26 CFR 1.671-4 – Method of Reporting
3
Office of the Law Revision Counsel. 26 USC 672 – Definitions and Rules
4
Office of the Law Revision Counsel. 26 USC 673 – Reversionary Interests
5
Office of the Law Revision Counsel. 26 USC 674 – Power to Control Beneficial Enjoyment
6
Office of the Law Revision Counsel. 26 USC 675 – Administrative Powers
7
Office of the Law Revision Counsel. 26 USC 676 – Power to Revoke
8
Office of the Law Revision Counsel. 26 USC 677 – Income for Benefit of Grantor
9
Office of the Law Revision Counsel. 26 USC 678 – Person Other Than Grantor Treated as Substantial Owner
10
Internal Revenue Service. Whats New – Estate and Gift Tax
11
Office of the Law Revision Counsel. 26 USC 2514 – Powers of Appointment
12
Office of the Law Revision Counsel. 26 USC 679 – Foreign Trusts Having One or More United States Beneficiaries
13
Office of the Law Revision Counsel. 26 USC 6048 – Information With Respect to Certain Foreign Trusts
14
Internal Revenue Service. International Information Reporting Penalties
15
Office of the Law Revision Counsel. 26 USC 2038 – Revocable Transfers
16
United States Code. 26 USC 645 – Certain Revocable Trusts Treated as Part of Estate