Naming a trust as an IRA beneficiary lets you control how retirement assets reach your heirs, but the IRS will only respect the arrangement if the trust qualifies as a “see-through” trust under Treasury regulations. When it does, the IRS looks past the trust and treats the human beneficiaries behind it as the IRA’s designated beneficiaries for distribution and tax purposes. When it doesn’t, the account gets forced out on a compressed schedule and the tax bill lands all at once.
The Four Requirements for See-Through Status
Treasury Regulation Section 1.401(a)(9)-4 sets out four things a trust must satisfy before the IRS will look through it to the individuals inside.1eCFR. 26 CFR 1.401(a)(9)-4 – Determination of the Designated Beneficiary All four have to hold for the entire period distributions are being calculated based on those beneficiaries.
First, the trust must be valid under the law of the state where it was created, or would be valid if it held assets. In practice this means proper execution and, in most states, a signed trust instrument. Second, the trust must be irrevocable, or must automatically become irrevocable at the IRA owner’s death. That lock is what prevents the distribution terms from being rewritten after the inheritance starts. Third, every person who could receive IRA assets through the trust must be identifiable from the document. Individual names are not required; an identifiable class like “my living children” is enough. Fourth, the trust must satisfy the regulatory documentation standard.
The 2024 final regulations changed how that last piece works. Under earlier proposed rules, the trustee had to hand the IRA custodian a copy of the trust agreement or a certified beneficiary list by a specific deadline. The final regulations dropped that requirement for IRAs entirely.2Internal Revenue Service. Internal Revenue Bulletin 2024-33 The trust still has to meet all four requirements, and the trustee should keep documentation ready if the IRS asks, but the paperwork no longer has to be filed with the financial institution.
Every Potential Beneficiary Has to Be a Person
The see-through rule assumes measurable life expectancies, so every beneficiary who could take under the trust must be a natural person. Naming a charity, a corporation, or the IRA owner’s estate anywhere in the chain kills see-through status. This is the most common drafting mistake and it can hide deep in the trust language. A clause sending leftover assets to a charitable organization after the primary beneficiaries die is enough to disqualify the whole arrangement.1eCFR. 26 CFR 1.401(a)(9)-4 – Determination of the Designated Beneficiary
When a see-through trust has multiple human beneficiaries, the IRS uses the oldest one’s life expectancy to run the distribution clock for everyone. A trust for three children aged 25, 30, and 40 would use the 40-year-old’s life expectancy, shortening the window for the younger two.3Internal Revenue Service. Required Minimum Distributions for IRA Beneficiaries With a direct beneficiary designation, each person named on the IRA can open a separate inherited IRA and use their own life expectancy. Beneficiaries inside a single trust cannot. The trust is the named beneficiary, and the oldest person behind it sets the pace.
The pool of beneficiaries also has to be fixed as of the IRA owner’s date of death. The trust can adjust shares among identified people, but it cannot leave the door open to adding new beneficiaries later.
Conduit or Accumulation: The Core Drafting Choice
Every see-through trust is either a conduit or an accumulation trust, and the label describes what the trustee is allowed to do with IRA distributions once they land in the trust account. That single design decision drives taxes, asset protection, and how much authority the trustee actually has.
Conduit Trusts
A conduit trust requires the trustee to pass every dollar of IRA distributions directly through to the beneficiary. The trustee is a temporary holder with no authority to keep, invest, or accumulate the funds. When a distribution hits the trust, it goes right back out. Because the money flows straight through, the income is taxed at the beneficiary’s individual rate rather than the compressed trust brackets, which is almost always cheaper.
That simplicity made conduit trusts the default recommendation for decades. Tax reporting was clean, beneficiaries received predictable income, and the see-through requirements were easy to meet. The SECURE Act changed the calculus, which the next section gets into.
Accumulation Trusts
An accumulation trust lets the trustee hold IRA distributions inside the trust rather than paying them out. The trustee can invest the money, hold it for future needs, or release it on a schedule the trust dictates. This structure shows up when a beneficiary has creditor exposure, is a minor, has trouble managing money, or has special needs.
The cost is tax. Every dollar the trustee keeps inside the trust gets taxed at trust rates, and those rates compress fast. There is also a subtler issue: because retained funds may eventually pass to remainder beneficiaries, the IRS counts those remainder beneficiaries when identifying the oldest person in the trust. If any of them is a non-individual entity, see-through status fails altogether.
The 10-Year Rule Broke a Lot of Older Trusts
The SECURE Act of 2019, reinforced by SECURE 2.0, replaced the old stretch strategy with a 10-year distribution rule for most non-spouse beneficiaries. The entire inherited IRA has to be emptied by December 31 of the tenth year following the owner’s death.4Internal Revenue Service. Retirement Topics – Beneficiary The rule applies whether the beneficiary is an individual or a see-through trust with non-eligible beneficiaries.
Within that 10-year window, whether the owner had started taking required minimum distributions matters. The RMD starting age is currently 73.5Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs If the owner died at or after that age, the trust must continue taking at least annual minimum distributions across the decade, calculated using the beneficiary’s life expectancy, with the balance still zeroed out by year 10. If the owner died before reaching the RMD age, no annual distributions are required during the window; the trust can wait until year 10, though bunching income that way tends to be painful.
This is where many older conduit trusts fail. A conduit drafted before 2020 often limits the trustee to distributing “only the required minimum distribution” from the IRA. When the 10-year rule applies and the owner died before RMD age, there is no annual RMD. The trust language ties the trustee’s hands: distribute the RMD, except no RMD exists until year 10. The result is nothing for nine years and the entire account balance dumping out in a single tax year, potentially pushing the beneficiary into the top bracket and undoing everything the trust was meant to accomplish. Any conduit trust drafted before the SECURE Act should be reviewed by an estate planning attorney.
Eligible Designated Beneficiaries and the AMBT Carve-Out
Some beneficiaries escape the 10-year rule and can still stretch distributions across their own life expectancy. The IRS calls them eligible designated beneficiaries, and the list is short:4Internal Revenue Service. Retirement Topics – Beneficiary
- A surviving spouse, who can also roll the IRA into their own account.
- A minor child of the account owner, but only until the age of majority, which the regulations set at 21. Once the child turns 21, the 10-year clock starts, so the balance must be out by age 31. This applies to the owner’s own children, not grandchildren, nieces, or nephews.6Office of the Law Revision Counsel. 26 US Code 401 – Qualified Pension, Profit-Sharing, and Stock Bonus Plans
- Disabled or chronically ill individuals.
- Beneficiaries not more than 10 years younger than the deceased owner, such as a close-in-age sibling.
If a see-through trust’s sole beneficiary falls into one of these categories, the trust gets the longer distribution period. If the trust has multiple beneficiaries and even one is not eligible, the 10-year rule governs the whole trust. The one workaround is an applicable multi-beneficiary trust.
The SECURE Act created the AMBT for families that include a disabled or chronically ill beneficiary alongside other heirs. Three conditions apply: more than one beneficiary, see-through status with all individual beneficiaries, and at least one beneficiary who is disabled or chronically ill. The trust terms must also block any other beneficiary from having any right to the IRA assets until the disabled or chronically ill beneficiary dies.1eCFR. 26 CFR 1.401(a)(9)-4 – Determination of the Designated Beneficiary When those conditions are met, the disabled or chronically ill beneficiary is treated as an eligible designated beneficiary and can use the life expectancy method, even though other beneficiaries in the trust would otherwise be stuck with the 10-year rule. This matters especially where a special-needs beneficiary relies on SSI or Medicaid and an outright distribution would jeopardize benefits.
Trust Income Tax Rates Punish Retained Distributions
Trusts and estates use their own compressed rate schedule. The 2026 numbers:7Internal Revenue Service. 2026 Form 1041-ES
- 10% from $0 to $3,300
- 24% from $3,301 to $11,700
- 35% from $11,701 to $16,000
- 37% over $16,000
A single individual filer does not hit the 37% rate until taxable income exceeds $640,600. A trust reaches it at $16,000. On a $200,000 distribution held inside an accumulation trust, the federal income tax runs about $72,000. The same distribution taxed at an individual beneficiary’s rate could be tens of thousands less depending on their other income.
This is the built-in tension in trust-based IRA planning. Conduit trusts push income to the beneficiary’s lower rates but lose the protection once the money is out. Accumulation trusts keep the protection and pay for it at trust rates. Which side wins depends on the beneficiary’s creditor exposure against the tax cost.
The Asset Protection Payoff
A big reason to name a trust rather than an heir directly is creditor protection. In Clark v. Rameker, the Supreme Court held that inherited IRAs are not “retirement funds” protected from creditors in bankruptcy.8Justia Law. Clark v. Rameker, 573 US 122 (2014) A beneficiary who inherits an IRA outright has no federal bankruptcy protection for those assets, which is exactly why trust planning matters.
How much protection you actually get depends on the structure. A conduit trust protects the IRA balance sitting inside the retirement account, but the moment a distribution flows through to the beneficiary it becomes their personal property, reachable by creditors, divorce, and lawsuits. Under the 10-year rule the annual distributions can be large, which magnifies the exposure. An accumulation trust is stronger because the trustee can hold distributions inside the trust indefinitely. Assets kept in the trust generally aren’t treated as the beneficiary’s property, which shields them from creditor claims, bankruptcy, divorce, and malpractice suits. Add a spendthrift clause restricting the beneficiary from selling or transferring their interest and the protection tightens further. For beneficiaries in high-liability professions or unsteady financial situations, that protection often outweighs the tax cost of retaining income.
What Happens If the Trust Fails
If a trust misses any of the four see-through requirements, the IRS treats it as a non-designated beneficiary, and the outcome depends on when the owner died.3Internal Revenue Service. Required Minimum Distributions for IRA Beneficiaries If the owner died before RMD age, the entire IRA must be out within five years, with no life-expectancy stretching. If the owner died at or after RMD age, distributions run on the deceased owner’s remaining life expectancy as of the year of death, reduced by one for each following year. That “ghost life expectancy” method usually produces a 10- to 15-year distribution period depending on the owner’s age at death, based on the owner’s age rather than any beneficiary’s.
Either result is worse than a qualifying see-through trust, and the five-year rule in particular can trigger a large tax event on a big IRA. The mistakes that cause failure are almost always technical: a stray charitable remainder clause, a beneficiary class described too vaguely to be identifiable, or a trust that stays revocable at death because of a drafting oversight. They are fixable while the owner is alive and nearly impossible to fix afterward, which is the practical case for having the trust language reviewed now rather than later.