Intentionally Defective Grantor Trusts: The Odd-Named Tool Wealthy Families Use to Freeze Estate Taxes
A trust built with a flaw on purpose sounds like a financial disaster, but wealthy families use exactly that to keep decades of business growth out of reach of the estate tax.
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Imagine a sample family: a 70-year-old widower owns most of a distribution company that his two daughters run. The business is already valuable, and over the next decade or two it could be worth far more. That future growth is his estate tax problem. The federal estate tax applies to what he owns at death, so every dollar of growth he still holds then is a dollar the IRS can tax.
Wealthy families have a fix with an oddly unflattering name: the intentionally defective grantor trust, or IDGT. It locks in (“freezes”) the taxable value of a fast-growing asset and moves the future growth to heirs, outside the estate.
The people who need this are few, and they’re rich. Of the 7,195 estate tax returns filed in 2024, only 2,663 owed tax. Together they paid $23,313,220,000, according to IRS Statistics of Income data.
Why Wealthy Families Build a Trust With a Defect on Purpose
A grantor is the person who creates and funds a trust, and a grantor trust is one the tax code still treats as the grantor’s property for income tax purposes. Sections 671 through 679 of the Internal Revenue Code list what triggers that treatment. A popular trigger appears in 26 U.S.C. § 675(4)(C): the power to take back trust assets by substituting other property of equivalent value.
Lawyers write in a trigger like that and still make sure the gift counts as complete for estate tax purposes. That gives the trust two tax identities. For estate tax, the assets have left the grantor’s hands, but for income tax, he still owns them and reports the trust’s income on his own return.
That mismatch is the whole point. When the grantor pays the trust’s income tax out of his own pocket, the trust grows without that drag and his estate shrinks with every payment. In effect, the payments are an extra tax-free transfer to heirs.
Gift, Sale or Both: How Families Fund an IDGT
- A gift. The grantor transfers assets completely, using part of his lifetime gift and estate tax exemption.
- A sale. The grantor sells assets to the trust for a promissory note, a written IOU in which the trust agrees to pay him back with interest over time. Planners often make a gift first so the trust has its own assets backing the note.
The defect pays off a second time here. Because the grantor is treated as owning the trust’s assets, a sale to the trust is generally treated as a sale to himself. No capital gain is recognized. That ownership principle goes back to Rev. Rul. 85-13, which the IRS cited again in Rev. Proc. 2026-20, published October 6, 2026.
The note has to charge at least the applicable federal rate (AFR), the minimum rates the IRS publishes every month based on Treasury yields. Under 26 U.S.C. § 1274(b)(2)(B), the AFR is the benchmark used to value a note issued in exchange for property. A note that pays less invites the IRS to treat part of the deal as a gift.
How the Freeze Moves Growth Past the Estate Tax
Once the sale closes, the grantor’s estate holds a note instead of the business. The note’s value is capped at its principal plus interest at the rate set on day one. Any growth above that rate stays in the trust, outside his taxable estate, for his daughters.
If the business grows slower than the note rate, the trust’s assets mostly flow back to him as note payments. He loses little beyond setup costs.
That’s why IDGTs show up around assets with long growth horizons. In the second quarter of 2026, the top 1% of households held 53% of private unincorporated business assets and 50.9% of corporate equities and mutual fund shares, according to Federal Reserve data.
Trade-Offs That Can Sink an Estate Freeze
- No step-up in basis. Basis is the cost figure used to calculate capital gains. Under 26 U.S.C. § 1014(a), property inherited from someone who dies generally gets a new basis equal to its fair market value at death. That erases the built-in gain. Assets in an IDGT were removed from the estate, so heirs generally keep the grantor’s original low basis and owe capital gains tax when they sell. Some grantors use the swap power to move high-basis assets into the trust before death.
- Tax bills with no matching cash. The grantor owes tax on income he never gets. He needs to be able to cover those bills comfortably for years.
- Valuation risk. If the sale price is too low, the IRS may challenge it. A qualified independent appraisal is essential, especially for private companies and partnership interests.
- Legal costs. Drafting the trust, appraisals, tracking the note and filing trust tax returns all cost money.
Who Should Talk to an Estate Tax Attorney About an IDGT
An IDGT suits certain families well. Their estates are near or above the federal exemption and they own something likely to grow faster than the IRS minimum interest rate: a family business, concentrated stock or appreciating real estate. Adult children who will inherit should understand it as well, because they’ll live with the basis trade-off. State estate taxes add another layer. This is a plan to build with an experienced estate tax attorney and a CPA.
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Vilma Rios is a tax professional and tax content contributor with more than 15 years of experience in tax and accounting. She specializes in federal tax research, tax education, and translating complex tax rules into clear, practical information for individuals, families, and small-business owners.
Vilma is a Content Tax Contributor II with the National Association of Tax Professionals (NATP), where she contributes to tax education and professional content. She has also presented tax information through webinars, including Spanish-language tax education, and has appeared on Telemundo 47 discussing tax topics and helping viewers understand important tax-filing requirements.
Her experience also includes tax and accounting work, tax research, IRS-related matters, and public tax education. While in college, Vilma volunteered in an IRS-sponsored tax assistance program and was recognized for her community service by local and state officials.
Known as “Your Tax Geek,” Vilma is passionate about making taxes easier to understand and helping people navigate an increasingly complex tax system.
