Naming a trust as the beneficiary of an IRA or 401(k) comes up constantly on Bogleheads, usually from someone who assumes it works the way naming a trust as beneficiary of a house or a taxable account works: the trust takes over, the trustee manages things, and the rules that applied to the account in life keep applying after death. Retirement accounts don't work that way. A trust named as beneficiary changes the tax treatment of the inherited account, and depending on how the trust is written, it can either preserve a reasonable payout structure or trigger one of the highest effective tax rates in the code.
Here's what actually happens, why the SECURE Act reshaped this decision, and when a trust genuinely earns its complexity.
Why anyone does this in the first place
The usual reasons to name a trust rather than a person directly are the same reasons people use trusts elsewhere in an estate plan: control and protection. A trust can restrict how and when a beneficiary receives money, useful if the beneficiary is a minor, has creditor or divorce exposure, struggles with money management, or has special needs that would disqualify them from public benefits if they inherited a lump sum outright. Naming a trust means the trustee, not the beneficiary, controls distributions according to whatever terms you wrote into the trust document.
That control is real. What most people underestimate is what it costs in tax flexibility, especially since 2020.
The SECURE Act changed the entire calculation
Before the SECURE Act (effective for deaths after 2019), a non-spouse beneficiary of an inherited IRA or 401(k) could typically stretch required minimum distributions over their own life expectancy, sometimes decades. A trust drafted to pass through that stretch to its beneficiaries could preserve a similarly long, tax-deferred payout window.
The SECURE Act eliminated that stretch for most non-spouse beneficiaries. Most inherited retirement accounts must now be fully distributed within 10 years of the original owner's death, with no required distributions in the interim years for most beneficiary types, as long as the full balance comes out by the end of year 10. A small category called eligible designated beneficiaries, including a surviving spouse, a minor child of the original owner (until they reach majority, at which point the 10-year clock starts), a beneficiary who is disabled or chronically ill, or a beneficiary less than 10 years younger than the original owner, can still stretch distributions over their own life expectancy. Everyone else is on the 10-year clock.
This matters directly for trusts, because a trust is generally taxed based on the beneficiary category of the underlying individuals it's written for, not automatically granted a favorable category just because it's a trust.
Conduit trusts vs. accumulation trusts
If a trust is going to be named as a retirement account beneficiary, it needs to be what's called a "see-through" trust to get any individual-based tax treatment at all, meaning it meets specific IRS requirements (valid under state law, irrevocable or becomes irrevocable at death, identifiable beneficiaries, and required documentation provided to the plan custodian). Within that category, there are two structures with very different outcomes:
A conduit trust requires the trustee to pass any distribution taken from the retirement account straight through to the trust's beneficiary in the same year it's received. The trust itself never retains or accumulates the money, so the trust's own tax bracket never comes into play. The tradeoff is that this weakens the asset protection purpose: once money passes through to the beneficiary, it's exposed to the beneficiary's creditors, divorce, or spending decisions, the same exposure a trust was often created to avoid in the first place.
An accumulation trust allows the trustee to hold distributions inside the trust rather than paying them straight out, preserving the asset protection and control that's usually the whole point of using a trust. The cost is that any income the trust retains, rather than distributes, is taxed at trust income tax rates, which are dramatically compressed compared to individual brackets.
Why trust tax rates make accumulation expensive
Trust and estate income tax brackets compress the same rates individuals face into a fraction of the income range. For 2026, trusts hit the top 37% federal bracket at just $16,000 of retained taxable income, compared to $640,600 for a single individual filer (2026 trust and estate tax brackets; Tax Foundation, 2026 federal tax bracket tables). Retained investment income above that same $16,000 threshold can also trigger the 3.8% net investment income tax, pushing the combined marginal rate to 40.8% on ordinary income retained inside the trust.
A worked example
Consider a $500,000 IRA left to a trust for the benefit of an adult child, with the trustee required to distribute the full balance within the 10-year window under the post-SECURE Act rules.
If structured as a conduit trust, and the trustee takes out roughly $50,000 a year and passes it straight to the beneficiary, that $50,000 is taxed at the beneficiary's individual rate each year, the same as if they'd inherited the IRA directly. If the beneficiary is in the 22% bracket, that's roughly $11,000 a year in tax, ignoring other income and deductions.
If structured as an accumulation trust, and the trustee takes the same $50,000 distribution but retains it inside the trust rather than paying it out that year, the trust itself owes tax on that income. At $50,000 of retained taxable income, a meaningful portion sits in the 37% bracket (everything above $16,000), producing a tax bill in the neighborhood of $16,000 to $17,000 for that year alone, several thousand dollars more than the beneficiary would have paid individually on the same income.
That gap is why an accumulation trust only makes sense when the protection it provides, shielding the money from a beneficiary's creditors, a pending divorce, a substance abuse or spending problem, or preserving eligibility for means-tested benefits, is worth more than the extra tax. For a beneficiary who's financially stable and simply wants to inherit money efficiently, the extra tax cost of an accumulation structure usually isn't justified.
When a trust genuinely makes sense here
A beneficiary with special needs who would lose eligibility for means-tested government benefits if they inherited a lump sum directly. A properly drafted special needs trust, sometimes with accumulation provisions, can preserve both the inheritance and the benefits.
A minor child where you want a trustee managing the money and controlling distributions until the child reaches a specified age well beyond legal adulthood, rather than the money passing to a court-appointed guardian at 18.
A beneficiary with significant creditor, lawsuit, or divorce exposure, where the protection an accumulation trust provides is worth the trust-rate tax cost on retained income.
Blended family situations where you want to ensure a surviving spouse can use retirement account income during their lifetime, while ultimately directing what remains to children from a prior relationship, a use case that requires careful, specific drafting.
When it doesn't
A financially stable adult beneficiary with no creditor, divorce, or benefits-eligibility concerns. Naming them directly as beneficiary avoids trust drafting costs, ongoing trustee administration, and the accumulation-trust tax penalty entirely, while still respecting the 10-year distribution window under current law.
As a way to avoid the 10-year rule. A trust doesn't restore the pre-SECURE Act stretch for a non-eligible-designated beneficiary. If the goal is simply to extend the payout period beyond 10 years for an otherwise ordinary adult beneficiary, a trust won't accomplish that; the same 10-year clock applies whether the beneficiary inherits directly or through a trust drafted for them.
Get this drafted by someone who does it specifically
This is one of the few areas in personal finance where generic advice, including this post, isn't a substitute for a qualified estate planning attorney reviewing your specific state's law, your specific account custodian's requirements, and your family's actual situation. A trust that fails to meet the see-through requirements, or that's ambiguous about conduit versus accumulation treatment, can default to the least favorable tax treatment available, sometimes requiring the entire account to be distributed and taxed within five years rather than the standard rules that would otherwise apply. Naming a trust as beneficiary is a decision with real consequences if it's drafted wrong, and no downside if you get it reviewed by someone who works in this specifically before you finalize the beneficiary designation.
If you're mapping out where retirement accounts fit into your overall estate plan, the beneficiary designation on each account, not just your will, is what actually controls where the money goes. A will doesn't override a beneficiary designation on an IRA or 401(k); the designation itself is a separate, binding instruction to the custodian.
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Create your free dashboardFrequently asked questions
Does naming a trust avoid probate for my retirement accounts?
Retirement accounts with a valid beneficiary designation, whether that's a person or a trust, already bypass probate regardless of the trust decision; the beneficiary designation itself controls the transfer outside of probate. Naming a trust doesn't add a probate-avoidance benefit that a direct individual beneficiary designation doesn't already provide; the reason to use a trust is control and protection, not probate avoidance.
Can a surviving spouse be named through a trust and still get spousal treatment?
It depends entirely on how the trust is drafted. A properly structured trust for the sole benefit of a surviving spouse, meeting specific IRS requirements, can in some cases preserve spousal rollover treatment, but this requires careful, specific drafting and isn't automatic just because the spouse is the intended beneficiary. Get this reviewed by an estate planning attorney if spousal treatment is the goal.
What happens if my trust doesn't qualify as a "see-through" trust?
If the trust fails to meet the IRS's see-through requirements, the retirement account generally must be distributed on a much faster schedule than the standard rules would otherwise require, often within five years if the original owner died before their required beginning date, rather than the 10-year window available to a qualifying trust. This is one of the most common and costly drafting mistakes with retirement account trusts.
Is naming my revocable living trust automatically a bad idea?
Not automatically, but it requires the same see-through analysis as any other trust. A revocable trust becomes irrevocable at your death, which is when the see-through requirements are evaluated, so a revocable trust can qualify if it's drafted correctly. The rollover-to-inherited-IRA mechanics and beneficiary categorization still apply the same way; the trust being revocable during your lifetime doesn't exempt it from the post-death rules.