Guides
Grantor Trust Rules, Explained
The grantor trust rules are a set of Internal Revenue Code provisions, IRC sections 671 through 679, that treat the person who created a trust as the owner of its assets for income tax purposes when that person keeps certain powers or benefits. When the rules apply, the trust’s income, deductions, and credits are taxed to the grantor personally rather than to the trust or its beneficiaries. A trust becomes a grantor trust the moment a retained power listed in sections 673 to 679 is present, regardless of whether the trust is labeled revocable or irrevocable.
The label “grantor trust” describes a tax status, not a specific document. Two trusts with nearly identical estate-planning goals can have opposite income tax treatment depending on a single retained power. This guide covers which powers trigger the status, how the income is taxed, why planners sometimes create the status on purpose (the intentionally defective grantor trust), the automatic rule for revocable living trusts, and the separate regime for foreign trusts.
What makes a trust a grantor trust
A trust is a grantor trust when the grantor, or in some cases another person, holds a power or interest described in IRC sections 673 through 678, or when a foreign trust meets the test in section 679. Section 671 sets the consequence: the holder is treated as owner of all or part of the trust and reports that portion’s tax items directly. Section 672 supplies the definitions, including the “adverse party” and “nonadverse party” concepts that determine whether a power counts.
The policy is dominion and control. Congress designed these rules in the 1950s and 1960s to stop taxpayers from shifting income to a separate trust taxpayer while keeping practical command over the assets. If the grantor retains enough control or benefit, the tax law disregards the trust as a separate taxpayer for the powers that apply.
Grantor trust status can be full or partial. A retained power may cause ownership of the entire trust or only of a specific portion, such as the income attributable to one funded asset. In practice most planned grantor trusts are drafted so the grantor owns 100 percent of both income and principal.
The powers that trigger grantor trust status
The table below lists the retained powers or interests that cause grantor trust treatment, with the controlling Code section. Any one of them can be enough on its own. The exact reach of each power depends on the trust document and can be limited by exceptions written into the same section, so the presence of a power does not always mean the whole trust is a grantor trust.
| IRC section | Retained power or interest | What generally triggers status |
|---|---|---|
| 673 | Reversionary interest | Grantor keeps a reversion worth more than 5 percent of the trust value at inception |
| 674 | Power to control beneficial enjoyment | Grantor (or a nonadverse party) can decide who receives income or principal, subject to several exceptions |
| 675 | Administrative powers | Power to deal with trust assets for less than full value, borrow without adequate interest or security, or substitute assets of equal value in a nonfiduciary capacity |
| 675(4)(C) | Power of substitution (swap power) | Grantor can swap assets of equivalent value in a nonfiduciary capacity, a common intentional trigger |
| 676 | Power to revoke | Grantor (or a nonadverse party) can revoke and return assets to the grantor; the default rule for revocable trusts |
| 677 | Income for the benefit of the grantor | Trust income may be distributed to, or accumulated for, the grantor or the grantor’s spouse, or used to pay premiums on their life insurance |
| 678 | Power held by a person other than the grantor | A third party can vest trust income or principal in themselves, making that person the deemed owner |
| 679 | Foreign trust with a U.S. beneficiary | A U.S. person transfers assets to a foreign trust that has a U.S. beneficiary |
Several of these powers include carve-outs. Section 674, for example, lists exceptions for powers held by an independent trustee or limited by an ascertainable standard, so not every power over enjoyment creates grantor status. A drafting attorney reviews each section against the trust terms before relying on a given result.
How grantor trust income is taxed
When the rules apply, the grantor reports the trust’s income, deductions, and credits on their own Form 1040 as if they earned the items directly. The trust generally pays no separate income tax, and its activity is measured at the grantor’s individual rates rather than the compressed trust tax brackets, which reach the top 37 percent rate at a much lower income level in 2026.
Reporting can follow more than one method under Treasury Regulation 1.671-4. A grantor trust may file a Form 1041 that carries only its name and taxpayer identification number, with a separate grantor tax information letter listing the items the grantor must report. Alternatively, for many trusts where the grantor is the trustee and uses their own Social Security number, no Form 1041 is required at all, and the income flows onto the Form 1040 directly. The correct method depends on who serves as trustee and how the trust is titled.
Because the grantor pays the tax, transactions between the grantor and the trust are generally ignored for income tax. A sale of appreciated property from the grantor to their own grantor trust usually triggers no capital gain, and interest paid on a note between them is typically disregarded. This transparency is the mechanism behind several estate-planning techniques.
The intentionally defective grantor trust (IDGT)
An intentionally defective grantor trust is an irrevocable trust drafted to be outside the grantor’s taxable estate for estate tax purposes while remaining a grantor trust for income tax purposes. The word “defective” refers only to the income tax status: the trust is deliberately given a retained power, often a section 675(4)(C) swap power or a section 677 insurance provision, so income is taxed to the grantor even though the assets have left the estate.
Two features make the IDGT useful. First, the grantor pays the trust’s income tax from separate funds, which lets the trust assets compound without the drag of annual tax and effectively transfers additional wealth to the beneficiaries without using gift tax exemption. Second, the grantor can sell appreciating assets to the trust for a promissory note without recognizing gain, freezing the asset’s value in the estate while future appreciation accrues inside the trust. Both results depend on the grantor trust status holding for the life of the plan.
The trade-off is that the grantor bears a tax bill on income they may never receive. Many IDGTs include a mechanism, such as a trustee’s discretion to reimburse the grantor for the tax, though reimbursement provisions carry their own estate-inclusion risk and vary by state. Anyone funding an IDGT reports the initial gift on a gift tax return, and the estate-tax context is covered in our estate and gift tax report.
Revocable living trusts are grantor trusts by default
Every revocable living trust is a grantor trust while the grantor is alive. The power to revoke and reclaim the assets is precisely the power described in section 676, so the status attaches automatically without any special drafting. Income from the assets is reported on the grantor’s Form 1040 using their Social Security number, and no separate trust return is generally required during the grantor’s lifetime.
This default ends at the grantor’s death. The trust usually becomes irrevocable, obtains its own employer identification number, and begins filing Form 1041 as a separate taxpayer or non-grantor trust. The assets typically receive a basis adjustment to fair market value at death under section 1014, which is explained in our guide to the step-up in basis. A revocable trust does not save income tax during life and does not remove assets from the taxable estate; its value lies in probate avoidance and management continuity.
Foreign grantor trusts
Section 679 applies a separate test to foreign trusts. When a U.S. person transfers property to a foreign trust that has at least one U.S. beneficiary, the trust is generally treated as a grantor trust as to that U.S. person, and its income is taxed to them currently. Section 679 takes precedence over the section 673 to 678 rules for foreign trusts, so it can apply even where none of the domestic retained-power tests would.
Foreign grantor trusts carry heavy reporting duties. A U.S. owner or transferor may need to file Form 3520 and Form 3520-A, with penalties for late or missing filings that can reach a significant percentage of the trust’s assets or the transfer amount. The reporting side is detailed in our explainer on Form 3520. A non-U.S. person who sets up a foreign trust can also create a grantor trust under different provisions, which changes who is taxed on the income, so cross-border structures need entity-specific analysis.
FAQ
What is the difference between a grantor trust and a non-grantor trust?
A grantor trust is taxed to the person who created it, who reports the income on their personal return, and the trust often files no separate return. A non-grantor trust is its own taxpayer: it files Form 1041, pays tax at compressed trust brackets on retained income, and passes distributed income to beneficiaries on Schedule K-1. The difference turns on whether a retained power under sections 673 to 679 is present.
Is a revocable living trust a grantor trust?
Yes. A revocable living trust is a grantor trust for as long as the grantor can revoke it, under IRC section 676. Its income is reported on the grantor’s Form 1040 using their Social Security number, and no separate trust return is generally required during the grantor’s lifetime. The status typically ends at death, when the trust becomes irrevocable and begins filing its own return.
Why would anyone create a grantor trust on purpose?
Planners intentionally create grantor trust status, often through a swap power under section 675(4)(C), to build an intentionally defective grantor trust. Keeping income tax status with the grantor while the assets sit outside the taxable estate lets the trust grow without tax drag and lets the grantor sell assets to the trust without recognizing gain. The grantor’s payment of the tax can act as an additional tax-free transfer.
Does a grantor trust have to file a tax return?
It depends on the reporting method. Under Treasury Regulation 1.671-4, many grantor trusts where the grantor is trustee report income directly on the grantor’s Form 1040 and file no Form 1041. Others file an informational Form 1041 with a grantor tax information letter, or have the trustee issue Forms 1099. The right method depends on who serves as trustee and how the trust is titled.
How is income in an IDGT taxed?
All income, deductions, and credits of an intentionally defective grantor trust flow to the grantor’s personal Form 1040 and are taxed at individual rates. The trust itself generally pays no income tax. Because the grantor pays the tax from separate funds, the trust assets compound without the annual tax drag, which is one of the main planning benefits of the structure.
What happens to grantor trust status when the grantor dies?
Grantor trust status generally ends at the grantor’s death. The trust usually becomes irrevocable, obtains its own employer identification number, and begins filing Form 1041 as a non-grantor trust. Assets included in the estate typically receive a basis adjustment to fair market value under section 1014. For an IDGT designed to be outside the estate, the income tax status ends but the estate-tax exclusion planning continues.
Reviewed by The Ledgerism Editorial Team. Last reviewed: July 2026.