A grantor trust is a trust whose income is taxed to the person who created and funded it rather than to the trust or its beneficiaries, because that person retained one of the powers listed in sections 671 through 679 of the Internal Revenue Code.
In plain terms
For income tax purposes the trust does not exist. Its dividends, interest, and capital gains land on the grantor’s personal return as though no trust had been created. For estate and gift tax purposes, the same trust can be entirely separate, with its assets fully outside the grantor’s estate. That split — invisible for one tax, real for another — is not an accident of drafting. It is the foundation of most sophisticated wealth transfer in the United States.
How it works
The grantor trust rules were written in the 1950s as an anti-abuse measure. Wealthy taxpayers had been shifting income into trusts taxed at lower rates while keeping practical control, so Congress said: retain any of these powers and you keep the tax bill. The listed powers include a reversionary interest, power over beneficial enjoyment, certain administrative powers, the power to revoke, and the use of trust income to pay premiums on insurance on the grantor’s life.
Then rates changed. Once trust brackets became more compressed than individual ones, the punishment stopped being a punishment. Planners began deliberately tripping one of the triggers — typically the power to substitute assets of equivalent value under § 675(4)(C) — to create a trust that is a completed gift for estate purposes but disregarded for income tax. The resulting structure is called an intentionally defective grantor trust.
Two rulings do most of the heavy lifting. Rev. Rul. 85-13 holds that the grantor is treated as owning the trust’s assets, so a sale between grantor and trust is a sale to oneself — no gain recognized, no taxable interest on a note. Rev. Rul. 2004-64 confirms that when the grantor pays the trust’s income tax, that payment is not an additional gift to the beneficiaries, because the grantor is discharging a liability that is legally the grantor’s own.
The numbers
- Statutory basis: IRC §§ 671–679; the swap power at § 675(4)(C) is the most common trigger.
- Top individual rate the grantor pays instead, 2026: 37% on ordinary income above $640,600 single, plus 3.8% net investment income tax.
- Top trust rate avoided, 2026: 37% at only $16,000 of retained income, per Rev. Proc. 2025-32.
- Tax-free transfer created: every dollar of income tax the grantor pays on the trust’s earnings, compounding outside the estate, uses none of the $15,000,000 exemption.
- Filing: a fully grantor trust generally reports under the grantor’s Social Security number; it need not file its own Form 1041 return under the optional simplified methods.
What people get wrong
That the grantor is being penalized. The tax bill looks like a cost and functions as a gift: the grantor pays tax on money that belongs to the children, so the trust compounds untouched while the grantor’s own estate shrinks by the amount of the payment — a transfer that consumes no exemption and is reported nowhere. The real risks sit elsewhere. Grantor status can be turned off, sometimes accidentally, and when it switches off, previously invisible transactions between grantor and trust can become taxable. And the tax obligation does not pause in a bad year; a grantor holding an illiquid position can owe tax on income they never see, which is why well-drafted documents include a discretionary reimbursement clause — one that must stay discretionary, since a mandatory right to reimbursement can drag the trust back into the estate.
Related
Read more: Trusts: How Wealth Is Held, Protected, and Passed On · Taxes: How Wealth Is Structured and Preserved · Generational Wealth: How Long Fortunes Actually Last
See also: Irrevocable trust · IDGT · GRAT · ILIT · Estate tax exemption