See Through Trust Inherited IRA

Why Trusts and IRAs Create a Tax Minefield

Naming a trust as IRA beneficiary is a common estate planning move — it gives the grantor control over how the money is distributed after death, protects the inheritance from a spendthrift beneficiary, and shields assets from creditors or divorce. The problem is that trusts and the IRS's inherited IRA rules interact in ways that can multiply the tax bill if the trust isn't structured correctly.

The distinction that matters most: whether the IRS treats the trust as a "see-through" entity that looks past the trust to the individual beneficiaries underneath, or as an opaque non-person that gets the least favorable distribution rules.

What Makes a Trust "See Through"

A see-through trust (also called a look-through trust) meets four requirements under IRS regulations:

1. The trust is valid under state law.
2. The trust is irrevocable, or becomes irrevocable upon the death of the IRA owner.
3. The trust beneficiaries are identifiable individuals.
4. A copy of the trust document (or a certified list of beneficiaries) is provided to the IRA custodian by October 31 of the year after the owner's death.

When all four conditions are met, the IRS "looks through" the trust to the underlying beneficiaries for distribution purposes. The beneficiary with the shortest life expectancy — or the least favorable distribution status — determines the distribution schedule for the entire inherited IRA.

If any condition isn't met, the trust is treated as a non-designated beneficiary. That means the five-year rule (if the owner died before their RBD) or the deceased's remaining life expectancy (if they died after their RBD) — both of which force faster distributions than the 10-year rule.

Conduit Trust vs. Accumulation Trust

Within the see-through category, trusts split into two types with drastically different tax consequences:

Conduit trusts require that all IRA distributions received by the trust are immediately passed through to the trust beneficiary. The trust is merely a pipeline — money flows in from the IRA and out to the beneficiary in the same tax year. The distribution is taxed on the beneficiary's individual tax return at their personal rate.

Under the SECURE Act's 10-year rule, conduit trusts work like this: the trust takes distributions from the inherited IRA (either annual RMDs if required, or voluntary withdrawals), and each distribution passes through to the beneficiary. The beneficiary pays tax at their individual rate. In year 10, the remaining balance must be fully distributed.

Accumulation trusts allow the trustee to retain distributions inside the trust rather than passing them to the beneficiary. This is where the tax trap lives.

The Compressed Tax Bracket Problem

Trusts that retain income are taxed at their own rates, and those rates compress brutally. In 2026, trusts and estates hit the top 37% federal rate at taxable income over $16,000. A single individual doesn't hit that rate until taxable income exceeds $640,600.

That means $100,000 retained inside an accumulation trust is taxed at an effective rate far higher than the same amount distributed to an individual beneficiary earning a normal salary. The trust pays roughly $34,000 in federal tax on that $100,000. An individual in the 24% bracket pays $24,000.

Over a 10-year depletion window on a $500,000 inherited IRA, the difference between accumulation trust taxation and individual taxation can exceed $50,000 in unnecessary taxes.

How the SECURE Act Changed Trust Planning

Before the SECURE Act, conduit trusts were the standard recommendation. The trust passed through life-expectancy RMDs to the beneficiary over decades — small annual distributions that were tax-efficient and protected the principal inside the trust.

The 10-year rule broke that strategy. A conduit trust must now pass through the entire IRA balance within 10 years. In year 10, whatever remains in the IRA flows through the trust to the beneficiary in a single distribution. The trust provides no protection for that final lump sum — the beneficiary receives the full amount, exposed to creditors and their own spending decisions.

This created an awkward choice. Keep the conduit trust and lose asset protection in year 10. Switch to an accumulation trust and pay punishing trust tax rates on retained distributions. Or restructure the trust entirely.

Some estate planners now recommend accumulation trusts that strategically distribute income to beneficiaries each year — using the trustee's discretion to distribute enough to fill lower brackets while retaining minimal income inside the trust. This hybrid approach requires an engaged trustee and active tax planning.

When Naming a Trust as IRA Beneficiary Makes Sense

Despite the tax complications, trusts remain appropriate in specific situations:

• Minor beneficiaries who can't legally own an IRA outright.
• Beneficiaries with disabilities where direct ownership would disqualify government benefits (special needs trusts).
• Spendthrift beneficiaries who would liquidate the IRA immediately.
• Blended families where the surviving spouse and the deceased's children from a prior marriage have competing interests.
• Creditor protection in states where inherited IRAs aren't protected from creditors (the Supreme Court's Clark v. Rameker decision ruled inherited IRAs aren't "retirement funds" under federal bankruptcy law).

In each case, the asset protection or control benefits need to outweigh the tax cost. A CPA and estate attorney should model the numbers before making the designation.

What to Do If You've Inherited an IRA Through a Trust

If you're the beneficiary of a trust that holds an inherited IRA, your first step is finding out whether it's a conduit or accumulation trust. This is spelled out in the trust document — look for language about whether the trustee "shall distribute" (conduit) or "may distribute" (accumulation) IRA proceeds.

Then determine whether the trust qualifies as a see-through. The trustee should have provided a copy of the trust document or beneficiary certification to the IRA custodian by October 31 of the year after the owner's death. If this step was missed, the trust may be treated as a non-designated beneficiary — a worse outcome than either trust type.

The Retirement Account Claims toolkit covers trust beneficiary scenarios alongside direct beneficiary claims, with decision trees for conduit vs. accumulation trusts and worksheets for the compressed bracket calculation.