Grantor Trusts and Intra-Family Loans: A Primer

← All posts

Pairing a loan with an intentionally defective grantor trust is a classic wealth-transfer technique. Here's the shape of it.

Pairing an intra-family loan with an intentionally defective grantor trust is one of the most established wealth-transfer techniques in estate planning. The name is unhelpful; the underlying idea is simple.

What “intentionally defective” means

An intentionally defective grantor trust (IDGT) is deliberately drafted so that it is treated as two different things by two different parts of the tax code:

• For estate and gift tax, assets in the trust are outside the grantor's estate. That is the point: future appreciation happens outside the taxable estate.
• For income tax, the trust is still the grantor. Its income is taxed to the grantor personally.

The “defect” is that second treatment, and it is intentional because it turns out to be an advantage rather than a flaw.

Why the income-tax treatment helps

Two consequences follow, and both work in the family's favour.

First, because the grantor and the trust are the same taxpayer for income purposes, transactions between them are generally not taxable events. A sale of an appreciated asset to the trust does not trigger capital gains, and interest the trust pays the grantor is not taxable income to the grantor.

Second, the grantor paying the trust's income tax from personal funds is not treated as an additional gift. The grantor is simply paying their own tax bill. In practice this transfers value to the beneficiaries every year, entirely outside the gift tax system, while shrinking the grantor's own estate.

The sale-to-IDGT structure

The classic sequence:

• The grantor establishes the trust and typically funds it with a meaningful seed gift, so it has genuine substance of its own.
• The grantor sells an appreciating asset (business interests, real estate, a concentrated position) to the trust.
• The trust pays with a promissory note at the Applicable Federal Rate.
• The asset's future growth accrues inside the trust, outside the estate.

The economics turn on a spread. The grantor's estate holds a note growing at the AFR. The trust holds an asset that, if the plan works, grows faster than that. Everything above the AFR passes to the beneficiaries without using additional exemption.

The AFR being a Treasury-derived rate is what makes this attractive: it is a comparatively low hurdle for an appreciating asset to clear.

Where it gets delicate

• Seed capital. A trust that buys an asset with nothing but a note may be treated as lacking economic substance. Advisers commonly want the trust meaningfully capitalised relative to the purchase.
• Valuation. The asset must be sold at genuine fair market value. Aggressive valuations are the most frequently challenged element of the whole structure.
• The note must be real. Correct AFR tier, documented terms, and actual payments that actually happen. This is the same discipline any family loan needs, and the same place these arrangements most often weaken.
• Grantor mortality. If the grantor dies while the note is outstanding, the treatment is more complex and worth planning for explicitly.

Who this is actually for

Be clear-eyed: this is a technique for families with estates large enough that the 2026 exemption ($15 million per individual, $30 million per couple) is a real constraint, and typically with an asset expected to appreciate substantially.

For most families, a straightforward documented loan, possibly with annual forgiveness inside the exclusion, accomplishes what they actually want with a fraction of the complexity and cost.

What both structures share is the unglamorous part: a note at the right rate, serviced on schedule, with a record. Sophisticated planning fails for the same reason simple family loans do: nobody maintained it.

---

General information, not tax or legal advice. IDGTs are complex instruments requiring qualified estate counsel. Nothing here should be acted on without advisers who know your circumstances.