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Trust Law/Level V · Tax and legacy/5.2 Annuity and unitrust structures/Lesson 5

Beneficiary defective inheritor trusts (BDIT)

How a beneficiary defective inheritor’s trust is meant to work under IRC §678, and why planners treat it as an aggressive technique with real uncertainty.

Education, not legal advice. Trust law changes from country to country and state to state, and the right structure depends on your situation. Anything you sign should be drafted or reviewed by a qualified lawyer where you live.

The lean path

The cheapest, lowest-tax, simplest and most private route the law allows, best first. Each step names the rule it rests on and the condition that keeps it lawful.

  1. For estates under the 2026 basic exclusion of $15,000,000, no BDIT is needed: a parent can leave an inheritance in an ordinary discretionary third-party trust that shields it from the beneficiary’s creditors and estate, with no sale and no ruling risk.
  2. That third-party trust can make the beneficiary a co-trustee limited to health, education, maintenance and support, with a limited power of appointment, without estate inclusion (IRC §2041); the catch is that the parent, not the beneficiary, must fund it.
  3. If a BDIT is still pursued, keep the seed withdrawal right within the greater of $5,000 or 5% so its lapse is not a gift by the beneficiary (IRC §2514(e)); the IRS will not ordinarily rule on §678 lapse treatment (Rev. Proc. 2026-3).
  4. Any sale into the trust must be at appraised fair value with interest at least the AFR, 4.61% mid-term for October 2026; a failed structure brings §2036 or §2038 inclusion plus interest and penalties, so professional fees make sense only for large, fast-growing assets.

MaterialsThe text of IRC §678, free on law.cornell.eduLesson 5.1.5, on grantor trusts, and lesson 5.1.6, on installment sales to grantor trustsThe IRS’s current list of areas in which it will not ordinarily issue letter rulings, published each year as Revenue Procedure 20XX-3

Wonder

  1. How can a beneficiary be treated as the owner of a trust someone else created?
  2. What does the beneficiary hope to gain by selling assets to the trust?
  3. What happens if the IRS or a court does not accept the structure?

Explore

  1. A beneficiary defective inheritor’s trust (BDIT) is a US planning technique that some practitioners use and others regard as aggressive. A third party, often a parent, creates an irrevocable trust for the beneficiary with a small gift, and gives the beneficiary a right to withdraw that gift, which lapses if unused. The aim is for the beneficiary to be treated as owner of the trust for income tax, while the trust stays outside the beneficiary’s estate and away from the beneficiary’s creditors. No statute or published IRS ruling approves the structure as a whole.
  2. The income tax side rests on IRC §678. Under §678(a)(1), a person other than the grantor is treated as owner of trust property over which they hold a power, exercisable solely by themselves, to vest it in themselves. Under §678(a)(2), that treatment can continue after the person partially releases or modifies the power, if they keep control that would make a grantor the owner under §§671–677. Whether a lapse counts as a ‘release’ is debated. The IRS has accepted lapse-based treatment in some private letter rulings, which bind only the taxpayers who requested them.
  3. Once the trust is treated as the beneficiary’s for income tax, the beneficiary may sell assets to it, often for a promissory note, much as in lesson 5.1.6. Because the beneficiary is the deemed owner, the sale is generally ignored for income tax, and the beneficiary pays tax on the trust’s income, which can shrink the beneficiary’s own estate. The beneficiary often serves as a trustee with distributions limited to health, education, maintenance and support, and may hold a limited power of appointment. Assets kept outside the beneficiary’s estate do not get a stepped-up basis at the beneficiary’s death.
  4. The estate and gift tax side carries the main risks. Because the beneficiary sells assets to a trust of which they are a beneficiary, the IRS may argue that the beneficiary is in substance a transferor who kept an interest, bringing the assets into the estate under IRC §2036 or §2038 (lesson 5.1.3). The sale must be for full value, so valuations can be challenged. The lapse itself is a gift by the beneficiary to the extent it exceeds the greater of $5,000 or 5% under IRC §2514(e) (lesson 5.1.2), one reason the seed gift is kept small. State law on self-settled trusts can affect creditor protection (lesson 6.1.2).
  5. The IRS lists whether a person is treated under §678 as owner of trust property they have, or had before a release, a power to withdraw among the areas where it will not ordinarily issue letter rulings, a list it updates each year (for example, Rev. Proc. 2026-3). No published court decision has approved the full structure. Drafting, valuation and administration costs vary widely by place and adviser, and an unsuccessful result can bring tax, interest and penalties.
  6. For these reasons, BDITs are discussed among planners as an advanced technique for people with large, fast-growing assets, and they are presented here cautiously as such. They do not escape tax: the beneficiary pays income tax on the trust’s income, and federal transfer taxes still apply if the structure fails. With the 2026 federal basic exclusion at $15,000,000 per person (One Big Beautiful Bill Act, July 2025), many families face no federal estate tax at all. This lesson describes how the technique is meant to work and where it is uncertain; it does not suggest using one.

Key facts

  • In a BDIT, a third party creates the trust with a small gift and gives the beneficiary a withdrawal right that lapses.
  • IRC §678(a) can treat a person other than the grantor as income tax owner of trust property they can vest in themselves.
  • Whether a lapse counts as a ‘release’ under §678(a)(2) is debated; private letter rulings bind only the taxpayers who requested them.
  • The beneficiary typically sells assets to the trust for full value, a sale generally ignored for income tax while the beneficiary is the deemed owner.
  • The main risk is that the IRS treats the beneficiary as a transferor who kept an interest, bringing assets into the estate under §2036 or §2038.
  • No statute or published IRS ruling approves the BDIT structure as a whole.

Exercise nine, six, three, one

9CollectList up to 9 features of a BDIT described in an article or proposal you are reading (some descriptions have fewer), such as who funds the trust, the seed gift, the withdrawal right, who is trustee, what is sold to it and how it is paid for.
6ClusterSort them into 6 categories: funding, withdrawal rights, trustees and powers, the sale, distributions, and claimed tax results.
3DistillReduce the 6 categories to 3 groups: features with clear statutory support, features that depend on uncertain interpretation, and features you would ask a tax adviser about.
1CrystallizeWrite 1 sentence explaining, in your own words, why a BDIT is meant to be the beneficiary’s trust for income tax but not part of the beneficiary’s estate.

Fact check

Dates, figures and claims checked against the published sources listed below.

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