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Intentionally Defective Grantor Trust (IDGT)

A trust that is treated as separate from the grantor for estate tax purposes but as owned by the grantor for income tax purposes. This split treatment allows the grantor to pay income taxes on the trust's earnings, effectively making additional tax-free gifts to beneficiaries.

Vehicle Source: Billionaire Wealth Strategies Verified: 2026-04-07

What Is an Intentionally Defective Grantor Trust?

An Intentionally Defective Grantor Trust is an irrevocable trust with a deliberate "defect" under the Internal Revenue Code's grantor trust rules (IRC Sections 671 through 679). The defect causes the IRS to treat the trust as owned by the grantor for income tax purposes, while estate and gift tax law treats the trust as a separate entity.

The split treatment means assets in the IDGT are removed from the grantor's taxable estate for federal estate tax purposes under IRC Subtitle B. Simultaneously, the grantor pays income taxes on all trust earnings from personal funds. Under Revenue Ruling 85-13, the grantor's tax payments are not considered additional gifts to the trust, allowing trust assets to compound without income tax drag.

As described in "Billionaire Wealth Strategies" (Jim Dew, 2024, Chapter 4), the IDGT is one of the more tax-efficient vehicles for transferring appreciating business interests and investment assets to the next generation.

How Does an Intentionally Defective Grantor Trust Work?

The estate attorney drafts an irrevocable trust with a specific provision that triggers grantor trust status under IRC Sections 671 through 679. Common grantor trust triggers include:

Retaining the power to substitute assets of equivalent value under IRC Section 675(4)(C)
Allowing the grantor to borrow from the trust without adequate security under IRC Section 675(3)
Granting a nonadverse party the power to add beneficiaries under IRC Section 674

The grantor then "seeds" the IDGT with an initial gift, typically equal to approximately 10% of the total intended transfer value. The seed gift uses the grantor's lifetime exemption under IRC Section 2010(c) and gives the trust economic substance for the subsequent transaction.

The grantor then sells appreciating assets, such as closely held business interests, to the IDGT in exchange for a promissory note. Under Revenue Ruling 85-13, the IRS views the grantor and the grantor trust as the same taxpayer for income tax purposes. The sale does not trigger capital gains tax because a person cannot have a taxable sale with themselves.

The promissory note carries interest at the Applicable Federal Rate (AFR) published monthly by the IRS under IRC Section 7872. The AFR is typically lower than market rates, creating a lower hurdle for the IDGT to exceed. As trust assets appreciate beyond the AFR interest rate, all excess growth belongs to the trust beneficiaries free of estate and gift tax.

Meanwhile, the grantor's payment of income taxes on all trust earnings from personal funds further reduces the grantor's taxable estate without triggering additional gift tax. Over decades, the compounding effect of tax-free trust growth combined with estate-reducing tax payments creates significant wealth transfer advantages.

When Do Entrepreneurs Use an Intentionally Defective Grantor Trust?

Entrepreneurs use IDGTs when they hold appreciating assets and have sufficient liquidity outside the trust to pay the trust's income taxes.

Business interest transfers are the primary use case. Selling ownership stakes in a growing business to an IDGT before a major liquidity event, such as a sale, recapitalization, or IPO, is designed to capture post-sale appreciation inside the trust. The pre-event valuation determines the note amount, and all subsequent appreciation transfers to beneficiaries.

Real estate transfers move investment real estate with strong appreciation potential out of the taxable estate. The IDGT holds the property, and rental income pays down the promissory note to the grantor while property appreciation accrues to trust beneficiaries.

Combining with valuation discounts amplifies the IDGT's effectiveness. Transferring minority interests in family limited partnerships at discounted values under IRC Section 2704 reduces the principal amount of the promissory note. The discount means the IDGT acquires more economic value than the face value of the note.

High-income grantors benefit most from the income tax payment feature. The income tax payment benefit is most valuable when the grantor has substantial personal income in higher tax brackets and the trust holds high-earning assets. Every dollar of trust income tax paid by the grantor is a dollar that leaves the taxable estate without gift tax consequences.

Pre-exit planning for entrepreneurs expecting a business sale in three to five years allows time for the IDGT structure to achieve its wealth transfer objectives before the liquidity event changes the asset's value and character.

How Does Dew Wealth Approach Intentionally Defective Grantor Trusts?

The IDGT is one of the more tax-efficient wealth transfer vehicles available, but the structure requires precise coordination between the estate attorney, tax advisor, and business valuation specialist, as outlined in "Billionaire Wealth Strategies" (Jim Dew, 2024, Chapter 4).

The promissory note must carry the correct AFR rate under IRC Section 7872 for the month of the sale. The initial seed gift must be sufficient (typically 10% of the sale price) to give the trust economic substance for the installment sale transaction. The valuation of transferred interests must withstand IRS scrutiny under IRC Section 2703 and general valuation principles.

The Linchpin Partner ensures these components align properly. IDGTs often work in tandem with GRATs: the GRAT handles assets with near-term appreciation potential under IRC Section 2702, while the IDGT handles longer-term growth assets where the installment sale structure provides greater flexibility and no mortality risk.

The primary risks of IDGTs include the grantor's ongoing obligation to pay income taxes on trust earnings (which can be substantial for high-earning trust assets), the requirement to maintain the note payments on schedule, and the potential for IRS challenge of the initial asset valuation. If the IRS successfully increases the valuation, the gift element of the transaction (the seed gift) may exceed the amount reported on Form 709, consuming additional lifetime exemption.

Frequently Asked Questions

Why is paying the trust's income tax a benefit?

Under Revenue Ruling 85-13, when the grantor pays income tax on trust earnings, those tax payments reduce the grantor's taxable estate without being classified as gifts under IRC Subtitle B. The trust retains 100% of its earnings for growth and distribution. Over decades, the compounding effect may transfer significantly more wealth to beneficiaries compared to a non-grantor trust that pays its own taxes at compressed trust tax brackets (the highest rate of 37% applies at just $15,200 of trust income in 2025).

What happens if the business does not appreciate as expected?

The grantor still holds the promissory note and receives AFR interest payments from the trust. The IDGT structure does not create a loss for the grantor. The trust simply transfers less benefit than projected. The grantor's estate includes the note receivable, which replaces the value of the sold assets. The risk is that administrative costs were incurred without meaningful wealth transfer benefit.

Can I be the trustee of my own IDGT?

Generally, no. Having the grantor serve as trustee can collapse the estate tax benefits and cause the trust assets to be included in the grantor's estate under IRC Section 2036. An independent trustee or a trusted family member typically serves as trustee, with the grantor retaining only the specific powers that create grantor trust status (such as the IRC Section 675(4)(C) substitution power). The trust protector role can provide additional oversight without jeopardizing the trust's tax treatment.

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