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✓ Practitioner Verified Updated for 2026 | Intentionally Defective Grantor Trust (IDGT) — §675
Tax Intelligence Engine › Strategies › Intentionally Defective Grantor Trust (IDGT) — §675

Intentionally Defective Grantor Trust (IDGT) — §675

The complete practitioner guide to the Intentionally Defective Grantor Trust (IDGT) — covering installment sales to IDGTs, §675 grantor trust powers, estate freeze planning, and the income tax benefits of grantor trust status.

§675Grantor Trust Powers
Installment SaleEstate Freeze Technique
No Capital GainsOn Sale to IDGT
Income TaxGrantor Pays — Tax-Free Gift
IRC §675, §453, §2036, §2038 Grantor trust: §675 power causes grantor trust status Installment sale: No capital gains on sale to IDGT Income tax: Grantor pays trust income tax — additional tax-free gift

What is an IDGT?

An Intentionally Defective Grantor Trust (IDGT) is an irrevocable trust that is designed to be a grantor trust for income tax purposes (under §675 or other grantor trust provisions) but a completed gift for estate tax purposes. The trust is 'defective' in the sense that the grantor retains certain powers that cause the trust to be treated as a grantor trust for income tax purposes, but those powers do not cause the trust to be included in the grantor's taxable estate.

The key advantage of the IDGT is that the grantor can sell assets to the trust in an installment sale without recognizing capital gains (because a sale between a grantor and a grantor trust is disregarded for income tax purposes). The installment note received by the grantor in exchange for the assets freezes the value of the transferred assets in the grantor's estate, while any future appreciation on the assets passes to the trust beneficiaries estate-tax free.

Installment Sale to an IDGT

The most common use of the IDGT is an installment sale of a closely held business interest or other appreciating asset to the trust. The grantor sells the asset to the IDGT in exchange for an installment note bearing interest at the applicable federal rate (AFR). The sale is not subject to capital gains tax (because the sale is between the grantor and a grantor trust). The installment note freezes the value of the transferred asset in the grantor's estate, while any future appreciation on the asset passes to the trust beneficiaries estate-tax free.

The installment note must bear interest at the applicable federal rate (AFR) to avoid gift tax. The AFR for long-term obligations (over 9 years) is published monthly by the IRS. For April 2026, the long-term AFR is approximately 4.5%. The grantor reports the interest income on the installment note on their personal income tax return (as a grantor trust, the interest income is disregarded for income tax purposes).

Seeding the IDGT

Before making an installment sale to the IDGT, the grantor must 'seed' the trust with an initial gift of at least 10% of the value of the assets to be sold to the trust. The seed gift ensures that the trust has sufficient assets to make the installment note payments and demonstrates that the trust is not a sham. The seed gift uses the grantor's lifetime gift and estate tax exemption.

For example, if the grantor plans to sell a $10 million business interest to the IDGT, the grantor should first make a seed gift of at least $1 million to the trust. The $1 million seed gift uses $1 million of the grantor's lifetime exemption. The grantor then sells the $10 million business interest to the trust in exchange for a $10 million installment note bearing interest at the AFR.

§675 Grantor Trust Powers

The IDGT is made a grantor trust for income tax purposes by including one or more grantor trust powers in the trust document. The most common grantor trust power used in IDGTs is the power to substitute assets of equivalent value (§675(4)(C)). This power allows the grantor to swap assets in and out of the trust without triggering capital gains, which provides significant flexibility for tax planning.

Other common grantor trust powers include: the power to borrow from the trust without adequate security (§675(2)), the power to add beneficiaries (§674), and the power to reacquire trust assets by substituting other property of equivalent value (§675(4)(C)). Practitioners should carefully select the grantor trust powers to include in the IDGT to avoid inadvertently causing estate inclusion under §2036 or §2038.

IDGT vs. GRAT vs. SLAT

The IDGT, GRAT, and SLAT are all estate freeze techniques, but they have different characteristics and are appropriate for different situations. The IDGT is best for clients who want to freeze the value of a closely held business interest and transfer future appreciation to the next generation through an installment sale without recognizing capital gains. The GRAT is best for clients who want to transfer appreciation without using their lifetime exemption. The SLAT is best for married couples who want to transfer assets to an irrevocable trust while retaining indirect access through the beneficiary spouse.

Frequently Asked Questions

An IDGT is an irrevocable trust that is a grantor trust for income tax purposes (under §675) but a completed gift for estate tax purposes. The grantor can sell assets to the trust without recognizing capital gains, and any future appreciation on the assets passes to the trust beneficiaries estate-tax free.

The grantor sells a closely held business interest or other appreciating asset to the IDGT in exchange for an installment note bearing interest at the AFR. The sale is not subject to capital gains tax. The installment note freezes the value of the transferred asset in the grantor's estate, while future appreciation passes to the trust beneficiaries estate-tax free.

Before making an installment sale to the IDGT, the grantor must seed the trust with an initial gift of at least 10% of the value of the assets to be sold to the trust. The seed gift uses the grantor's lifetime gift and estate tax exemption.

The §675(4)(C) substitution power allows the grantor to swap assets in and out of the trust without triggering capital gains. This power causes the trust to be a grantor trust for income tax purposes and provides significant flexibility for tax planning.

The installment note must bear interest at the applicable federal rate (AFR) to avoid gift tax. The AFR for long-term obligations (over 9 years) is published monthly by the IRS. For April 2026, the long-term AFR is approximately 4.5%.

More Tax Planning FAQs

What is the IRS audit risk for this strategy?
The IRS audit rate for individual returns is approximately 0.4% overall, but increases significantly for returns with Schedule C income, large deductions, or specific strategies. Proper documentation is the best defense against an audit. Keep contemporaneous records, maintain written agreements, and ensure all deductions are supported by receipts and business purpose documentation.
How does this strategy interact with the alternative minimum tax (AMT)?
Many tax strategies that reduce regular income tax can trigger or increase AMT liability. Common AMT triggers include: ISO exercises, large state tax deductions, accelerated depreciation, and passive activity losses. Taxpayers should model both regular tax and AMT before implementing aggressive tax strategies to ensure the net benefit is positive.
What is the statute of limitations for IRS assessment of this strategy?
The IRS generally has three years from the later of the return due date or filing date to assess additional tax. If the taxpayer omits more than 25% of gross income, the statute is extended to six years. There is no statute of limitations for fraudulent returns or failure to file. Taxpayers should retain tax records for at least seven years to cover the extended statute of limitations.
How should this strategy be documented to withstand IRS scrutiny?
Documentation is the cornerstone of any tax strategy. Maintain contemporaneous records (created at the time of the transaction), written agreements, business purpose statements, and receipts. For strategies involving related parties, ensure all transactions are at arm’s length and documented with fair market value support. The burden of proof is on the taxpayer to substantiate deductions.
What is the economic substance doctrine and how does it apply?
The economic substance doctrine (§7701(o)) requires that transactions have both objective economic substance (a reasonable possibility of profit) and subjective business purpose (a non-tax reason for the transaction). Transactions that lack economic substance are disregarded for tax purposes, and the 40% strict liability penalty applies. Legitimate tax planning strategies must have genuine business purposes beyond tax reduction.
How does this strategy affect state income taxes?
Federal tax strategies do not always produce the same results at the state level. Some states do not conform to federal tax law changes (e.g., bonus depreciation, QSBS exclusion). Taxpayers should model the state tax impact of any federal tax strategy, especially in high-tax states like California, New York, and New Jersey. Some strategies may save federal taxes while increasing state taxes.
What is the step-transaction doctrine and how does it apply?
The step-transaction doctrine allows the IRS to collapse a series of related transactions into a single transaction if the intermediate steps have no independent significance. This doctrine is used to prevent taxpayers from using artificial multi-step transactions to achieve tax results that would not be available in a single transaction. Legitimate tax planning strategies should have independent business purposes for each step.
How does this strategy interact with the passive activity loss rules?
Passive activity losses (§469) can only offset passive income. Active business income, wages, and portfolio income are not passive. Real estate rental income is generally passive unless the taxpayer qualifies as a Real Estate Professional. Passive losses that cannot be used currently are suspended and carried forward to offset future passive income or recognized when the passive activity is disposed of in a fully taxable transaction.
What are the initial steps to properly set up an Intentionally Defective Grantor Trust (IDGT) under §675?
To establish an IDGT under §675, the grantor must create an irrevocable trust that intentionally includes provisions causing grantor trust status for income tax purposes but not for estate tax purposes. The trust agreement should explicitly reference §675 to ensure grantor trust treatment. Additionally, the grantor typically sells assets to the IDGT in exchange for a promissory note at the applicable federal rate (AFR), effectively freezing estate value. Proper drafting and execution with clear terms on trust powers and income taxation are essential to maintain the intended tax treatment.
When must the grantor file tax returns or disclosures related to an IDGT to comply with IRS requirements?
Although the IDGT is a separate legal entity, it is generally treated as a grantor trust under §675, meaning all income, deductions, and credits flow through to the grantor's individual income tax return. Therefore, no separate income tax return is filed for the trust. However, the trustee must maintain accurate records and provide necessary information to the grantor. Any sales of assets to the IDGT should be documented contemporaneously, and any promissory notes issued should comply with AFR requirements to avoid IRS challenges.
What documentation is critical to support an IDGT transaction during an IRS audit?
Key documentation includes the irrevocable trust agreement explicitly referencing grantor trust provisions under §675, the promissory note evidencing the sale to the trust at the applicable AFR, and contemporaneous valuations of transferred assets. Trustees should also maintain records of all trust income, expenses, and distributions. Failure to properly document these elements can trigger IRS scrutiny related to transfer pricing, substance over form, or estate inclusion issues.
What are the valuation challenges and limits when transferring assets to an IDGT?
Valuation of assets transferred to an IDGT is crucial as it determines the promissory note amount and potential gift tax exposure. The IRS may challenge low valuations, especially for illiquid or closely held assets. Valuations must comply with §2512 standards and should be supported by qualified appraisals contemporaneous with the transfer. The 2026 annual gift tax exclusion remains $17,000 per recipient, but transfers to an IDGT often exceed this, requiring gift tax returns and appropriate valuation to avoid audit risk.
How does the treatment of income differ if a client has both an IDGT and a Grantor Retained Annuity Trust (GRAT)?
An IDGT maintains grantor trust status under §675, causing income to be taxed directly to the grantor, whereas a GRAT typically is structured to avoid grantor trust status to facilitate estate freeze. Income generated within an IDGT is reported on the grantor's individual return, while income inside a GRAT may be taxed to the trust or beneficiaries depending on its terms. Coordination of these vehicles requires careful planning to avoid unintended income tax consequences and to optimize estate and gift tax benefits.
Can the sale of assets to an IDGT be combined with other estate planning strategies like valuation discounts or grantor retained unitrusts (GRUTs)?
Yes, combining an IDGT sale with valuation discounts is common to minimize gift tax exposure by reducing the appraised value of transferred interests. However, the IRS closely examines these discounts for lack of marketability or control under §2704. Similarly, integrating a GRUT may provide income streams to the grantor while shifting remainder interests outside the estate. Such combinations require careful drafting and substantiation to withstand IRS challenges regarding economic substance and valuation.
What client questions should I prioritize to assess suitability of an IDGT strategy?
Begin by evaluating the client's estate size relative to the 2026 exemption amount of $13,160,000, liquidity needs, and willingness to relinquish control over assets. Inquire about the types of assets intended for transfer, as illiquid or hard-to-value property may complicate valuations and note terms. Also, assess the client's income tax bracket since the IDGT income is taxed to the grantor; the client must be comfortable paying income taxes without depleting trust principal. Finally, review the client's long-term estate planning goals and capacity to manage trust administration complexities.

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Professional Disclaimer

The information on this page is intended for licensed tax professionals (CPAs, EAs, and tax attorneys) and is provided for educational and research purposes only. Tax law is complex and fact-specific — all strategies discussed are subject to limitations, phase-outs, and conditions that may not apply to every client situation. Practitioners should independently verify all information against current IRS guidance, Treasury Regulations, and applicable state law before advising clients. This content does not constitute legal or tax advice.

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