The Intentionally Defective Grantor Trust (IDGT)

How it works

An intentionally defective grantor trust works because two parts of the tax code define trust ownership two different ways, and I keep both readings open on purpose. For income tax, Subpart E of the Code, Sections 671 through 679, treats me as the owner of everything inside the trust: I report all of its income, deductions, and credits on my own return under Section 671, and the trust itself pays no income tax on what belongs to me. For estate and gift tax purposes, the same trust is an irrevocable, completed gift. Once the transfer is finished, the property inside it sits outside my gross estate, and everything it grows into afterward leaves with it.

That gap, defective for income tax, complete for transfer tax, produces two distinct benefits. The first is a transfer that costs nothing in gift tax. Because I owe the income tax on everything the trust earns, I pay it every year from funds outside the trust, which keeps the full amount rather than paying tax out of its own assets. Revenue Ruling 2004-64 confirms that paying the trust's income tax is not an additional gift to the beneficiaries; it satisfies my own liability under Section 671, nothing more, so every dollar of tax I pay leaves my estate for good at no gift-tax cost, and the trust compounds without that drag.

The second is the freeze itself. Once the trust is a grantor trust for income tax, I can sell it appreciating property, a family business interest, real estate, or an LLC or FLP stake, for a promissory note, and the sale is not a recognized event. Revenue Ruling 85-13 holds that because I am treated as owning the entire trust, a transaction between the trust and me is a transaction with myself: no sale, no gain, no new basis. What I hold afterward is a note fixed at the rate required under Sections 1274 and 7872, the applicable federal rate the IRS publishes monthly. Everything the property earns above that fixed rate belongs to the trust, permanently outside my estate.

What this is worth in Florida

Florida changes less about this than people expect, because the mechanism is entirely federal. Florida has no individual income tax, so my paying tax on the trust's income instead of a beneficiary changes nothing at the state level; that income was never going to be taxed by Florida either way. Florida residency does make the burn lighter than it would be in a high-tax state, since the federal liability is not stacked on top of a state one. Whatever this strategy is worth to a family, the value sits entirely on the federal side.

Who this applies to

This is not a strategy with an income cutoff or a required business structure. What gates it is exposure to estate tax and the willingness and ability to carry an ongoing tax bill personally.

• The grantor profile. Aimed at people who expect their estate to exceed the federal exemption, or who hold assets growing faster than the exemption is likely to grow: a closely held business, real estate, or an interest in a family LLC or FLP that can carry a supportable discount. The federal estate, gift, and generation-skipping exemption was $13,990,000 per person for 2025; for 2026 it is $15,000,000 per person, and $30,000,000 for a married couple only where both spouses use their own exemption or the survivor elects portability of the deceased spousal unused exclusion, which Section 2010(c)(5)(A) allows only on a timely estate tax return computing it. It is made permanent and inflation-indexed by recent federal legislation rather than reverting to a scheduled cut to roughly $7,000,000. The top transfer-tax rate both years is 40 percent.
• The willingness to bear the income tax. I need enough outside liquidity to pay tax on the trust's income indefinitely. An illiquid holding that still produces taxable income, a pass-through interest reporting K-1 income without distributing enough cash to cover it, can turn that liquidity demand into a real burden.
• What the trust can hold. Any income-producing asset works, including S corporation stock: a grantor trust is an eligible S corporation shareholder under Section 1361(c)(2)(A)(i) while grantor-trust status continues, with generally only a two-year window after my death to requalify before the S election is put at risk.
• The irrevocable, completed-gift requirement. The trust has to be a completed gift for transfer-tax purposes and a grantor trust for income-tax purposes at the same time, using a power that triggers one status without triggering the other, which is entirely a drafting question and the subject of the next section.

Two related vehicles are worth knowing about even though neither is covered here. A grantor retained annuity trust is the other common estate-freeze technique, built on Section 2702 rather than this set of rulings, and a zeroed-out structure needs no seed gift.

What it requires

Four things have to be in place at once, each doing real work. Missing any one either breaks the freeze or leaves the trust in my estate regardless of what the document says.

• A grantor-trust trigger that does not cause estate inclusion. A power from Sections 673 through 677 that is not also the kind of retained string Sections 2036 and 2038 use to pull a trust back into an estate.
• Real seed equity behind the note. The trust needs its own funded equity before any sale, so the note I take back is supported by more than the property I sold it.
• A note that behaves like genuine debt. Stated principal, a fixed term, and interest at or above the rate required under Sections 1274 and 7872, with real payments made on schedule.
• Personal payment of the trust's income tax, reimbursement kept discretionary. The tax-free burn depends on my paying the bill myself, never on the trustee owing it back to me.

Choosing the trigger

The power used most often is the swap, or substitution, power under Section 675(4)(C): held in a nonfiduciary capacity, the right to reacquire trust property by substituting property of equivalent value. Revenue Ruling 2008-22 confirms a properly limited swap power of this kind does not, by itself, cause estate inclusion under Sections 2036 or 2038. Revenue Ruling 2011-28 is the life-insurance analogue, holding the same about incidents of ownership under Section 2042 rather than about those two sections. A second option is a nonadverse power to borrow trust property without adequate interest or security under Section 675(2), avoiding the reversionary or income-to-grantor strings under Section 677 that Section 2036 is written to catch.

Funding and the sale

Practitioners commonly aim for seed equity equal to about ten percent of whatever will later be sold to the trust, a convention defending a genuine sale against the argument that it was really a disguised retained interest, not a number fixed by statute. The gift is reported on Form 709, with generation-skipping exemption allocated if grandchildren are beneficiaries; because it draws on the same unified exemption used for other lifetime giving, it leaves less available for gifting elsewhere. Afterward, I report the trust's income on my own Form 1040, or the trust files a Form 1041 information return under Treasury Regulation 1.671-4. A mandatory reimbursement clause pulls the entire trust back into my estate under Section 2036(a)(1); a discretionary one, whether or not used, does not.

What you need to document

None of this holds up on the strength of the trust document alone. What protects the position on examination is the paper trail behind it.

The trigger power's exact limits

The trust instrument's own language creating the swap or borrowing power, held in a nonfiduciary capacity, drafted to the same limits Revenue Rulings 2008-22 and 2011-28 describe. A broader power invites an estate-inclusion argument.

A qualified appraisal

An independent valuation of whatever is sold to the trust, including support for any minority-interest or marketability discount claimed on an FLP or LLC interest, plus a record of the entity's non-tax business purpose.

The note itself, and proof it is honored as debt

The signed promissory note showing principal, term, and rate, along with a record that payments are actually being made and that the trust had a genuine ability to repay when the note was issued.

The seed gift and any GST allocation

Form 709 reporting the funding gift, and, when grandchildren are beneficiaries, the return showing generation-skipping exemption allocated to the trust.

How the income tax is actually paid

Records showing I paid the tax personally from outside funds, and, if a reimbursement clause exists, trustee records showing any reimbursement was a discretionary decision rather than an automatic payment.

Where it goes wrong

This is not a listed or reportable transaction, but it is aggressive, fact-intensive and a perennial examination target, mostly around two questions: whether the sale was really a sale, and whether the valuation behind it holds up.

Recharacterization as a retained interest

The settled Woelbing and Karmazin matters both tested how much retained control or economic reality a sale like this can carry before the IRS successfully argues it was never a sale at all. Estate of Powell v. Commissioner, 148 T.C. 392, is often named alongside them and should not be: it involved no sale and no promissory note. There the decedent's assets went into a partnership for a 99 percent limited partner interest that was assigned away under a power of attorney days before death, and the court decided it under Section 2036(a)(2). It bears on retained control generally, not on whether an installment sale to a grantor trust is respected.

This is not a technicality. If the sale is recast as a retained interest, the full value of the trust, including everything it grew into, comes back into my estate under Section 2036. Every other requirement on this page exists to keep that from happening.

Weak valuation, an unreliable note, or a mandatory reimbursement clause

• An unsupported discount. An aggressive minority or marketability discount on FLP or LLC interests, without a qualified appraisal and a documented business reason, invites a challenge under Sections 2703 and 2704.
• A note that is not real debt. A below-market rate, no actual payments, or an unpayable balloon turns the note into evidence the whole arrangement was a gift or retained interest from the start.
• A mandatory reimbursement clause. If the trust document requires the trustee to reimburse me for the income tax I pay, Revenue Ruling 2004-64 treats that as pulling the full trust into my estate under Section 2036(a)(1); a discretionary clause does not.
• Turning off grantor status too early. Releasing the trigger power while a note is outstanding can end the protection Revenue Ruling 85-13 provides, under Revenue Ruling 77-402, turning the position into a deemed sale of the remaining balance with gain recognized. Better to pay off the note first.
• Losing the S election. Because grantor-trust status makes the trust an eligible S corporation shareholder, my death starts a limited window, generally two years, to requalify before the election is jeopardized.

The trade-off that rarely makes it into the pitch

Property inside this trust also permanently gives up a step-up in basis at my death under Section 1014. Because the trust is out of my estate, whatever I sold to it keeps my old basis forever, a real cost measured against whatever estate tax the freeze avoided, not a footnote. It is worth weighing against simply holding a low-basis, appreciated asset until death for the step-up instead, covered separately under how the basis step-up works. The swap power is a partial answer: late in life, I can use it to swap low-basis assets back into my name and higher-basis assets into the trust, recovering the step-up on what I take back.

A situation where this comes up

The clearest fit is a business owner or investor whose estate is already near the exemption and still growing faster than the exemption is likely to grow with it, holding exactly the kind of asset that benefits from an early freeze: a family business, commercial real estate, or an entity interest that can carry a supportable discount. What usually starts the conversation is the owner realizing that whatever the business is worth now, it will be worth considerably more by the time an exemption at death gets calculated against it.

The version that takes real preparation is the liquidity question, not the drafting. A properly limited swap power is not hard to get right with the right counsel. What is harder is confirming, before the sale happens, that there is genuinely enough income and cash reserve to carry the tax bill for years, sometimes decades, without needing to unwind anything early. I have seen the drafting done correctly and the liquidity question skipped, and it is the liquidity gap, not a defective trigger, that eventually forces an early exit and the recognition event that comes with it.

The situation that worries me is the sale happening before anyone has priced out what the trustee will owe every April, or before an appraisal exists to support what the entity interests were worth on the sale date. Both are fixable in advance and very hard to fix once an examination has started. I would rather build the appraisal and the liquidity plan into the front of this than leave either as paperwork to catch up on later. For a family that also wants to protect what is transferred from creditors and disputes, not just from estate tax, that is a related conversation I have separately under asset protection planning.