Reducing Estate Tax with an Intentionally Defective Grantor Trust

In our little enclave by the ocean, we meet several high-net-worth individuals and families looking for ways to reduce their taxable estates. One of the more sophisticated tools available is an Intentionally Defective Grantor Trust (IDGT). Despite its confusing name, the IDGT is a legal and effective strategy that separates estate tax from income tax obligations to maximize the transfer of wealth to heirs. Before considering this type of estate planning technique, it is good to review a comprehensive explanation of how IDGTs work, their benefits, risks, and specific considerations under California law.

An Intentionally Defective Grantor Trust is a type of irrevocable trust designed to be “defective” for income tax purposes, but valid for estate tax purposes. This strategic “defect” allows the grantor (the person creating the trust) to continue paying income taxes on trust earnings, even though the assets in the trust are no longer part of the grantor’s estate for estate tax purposes. This distinction is created by drafting the trust to include certain powers under the Internal Revenue Code (IRC §§ 671-679) that make the grantor the owner for income tax purposes, even though the trust is irrevocable and outside the grantor’s taxable estate for federal estate tax purposes. Together, the removal of the asset from the estate, and the erosion of the estate through tax payments, combine to avoid high federal estate taxes of 40% above $1 million. 

The key characteristics of an IDGT are: (1) It is Irrevocable: once established, the grantor cannot modify or revoke the trust. The assets transferred to the trust are no longer under the grantor’s ownership or control; (2) Grantor Trust Status: The trust includes specific provisions (e.g. the power to substitute assets of equivalent value under IRC § 675(4)(C)) that trigger grantor trust status for income tax purposes; (3) Estate Tax Exclusion: because the trust is irrevocable and the grantor retains no incidents of ownership, the assets are excluded from the grantor’s gross estate, helping minimize estate taxes; and (4) Income Tax Obligation: the grantor remains liable for income taxes on trust income, effectively allowing the trust to grow tax-free for the beneficiaries.

The main benefits of creating an Intentionally Defective Grantor Trust are that it reduces the size of the owner’s estate which will reduce estate taxes (which is important for estates above the federal estate tax limit that is currently $13,990,000 per person, but subject to decrease in 2026 if Congress does not act). California does not impose a separate estate tax, but high-net-worth individuals are still subject to federal estate tax. By transferring appreciating assets into an IDGT, the grantor removes those assets and their future appreciation from their estate, thereby reducing potential estate tax liability. This creates tax-free wealth accumulation for beneficiaries because the grantor continues to pay the income tax which means the irrevocable trust accumulates income and appreciates without tax erosion, allowing greater intergenerational wealth transfers. Also, because IDGTs are often funded through a sale of assets to the trust, normally using a promissory note, if the assets include a closely held business interest or a limited partnership interest then valuation discounts (due to lack of marketability and control) may also apply, further reducing the taxable value of the gift or sale. Finally, assets placed into an IDGT are generally protected from the grantor’s creditors (assuming proper structuring and no fraudulent intent), as well as from the beneficiary’s creditors, thus creating strong asset protection.

Now, before you say it is too good to be true, there are some risks and drawbacks. Firstly, the beneficiaries are forfeiting the “step up in basis” that would come with a direct transfer at death, meaning that capital gains taxes will be based upon a lower capital basis, and thus the gain and the tax will likely be higher, if the asset is sold in the future at an appreciated price. That said, capital gains taxes are lower than estate taxes, so there is an offset to that risk. Another consideration is that the grantor must have sufficient liquidity to pay the taxes on the trust income, even though the grantor does not receive the income from the trust. This, however, will further reduce the estate’s value if you are above the limit. Naturally, the irrevocability of the trust makes it an unalterable transfer so if circumstances change in the future there may not be an ability to change the trust. Finally, the IRS will be more interested in auditing these transactions if there is an aggressive use of valuation discounts and promissory notes and so proper documentation and qualified appraisals are critical.

The way to properly structure an IDGT is typically as follows:

– Seed Gift: The grantor funds the trust with a small “seed” gift (usually 10% of the value of the assets to be sold to the trust).

– Installment Sale: The grantor sells appreciating assets to the trust in exchange for a promissory note with an interest rate at the IRS’s Applicable Federal Rate (AFR).

– No Capital Gains on Sale: Because the sale is to a grantor trust, it is disregarded for income tax purposes, and no capital gain is recognized.

– Ongoing Tax Payments: The grantor continues to pay the income tax on the trust’s earnings, allowing the trust assets to grow without reduction.

Special Considerations in California

– Community Property: California is a community property state. Care must be taken when transferring community property into an IDGT to avoid inadvertently triggering gift tax consequences. Spousal consent and clear documentation of the character of the assets are essential.

– California Property Tax (Proposition 13): Transfers of real property into an IDGT may trigger property tax reassessment unless a parent-child exclusion or other exemption applies. Planners must coordinate closely with California’s property tax rules to avoid unintended reassessment.

– Income Tax Planning: Since California conforms closely to federal grantor trust rules, the grantor will also be responsible for paying California state income tax on trust income, which can be substantial. However, this can still be a strategic tax payment that effectively reduces the grantor’s overall estate.

If you have an estate that is likely to exceed federal estate tax exemptions, an Intentionally Defective Grantor Trust is a powerful estate planning tool to minimize federal estate taxes and transfer wealth efficiently. By carefully separating estate tax treatment from income tax treatment, the IDGT allows significant long-term tax savings while maximizing the growth of trust assets for beneficiaries. However, because of its complexity and potential pitfalls, an IDGT should only be implemented under the guidance of experienced estate planning counsel familiar with both federal and California-specific rules.