Retirement Accounts in Estate Planning: Legal Rules and SECURE Act

Retirement accounts occupy a distinct legal position in estate planning because they pass outside of probate through beneficiary designations, yet remain subject to complex federal tax and distribution rules. The SECURE Act of 2019 and its successor SECURE 2.0 Act of 2022 substantially restructured how inherited retirement accounts must be distributed, eliminating the "stretch IRA" strategy for most non-spouse beneficiaries. Understanding these rules is essential context for any estate plan that includes IRAs, 401(k)s, or similar tax-advantaged accounts, since errors in beneficiary designation or distribution planning can trigger significant and irreversible tax consequences. This page covers the legal framework, account classifications, distribution mechanics, and key decision points governing retirement accounts in a US estate planning context.

Definition and Scope

Retirement accounts in estate planning refers to the body of federal law, Internal Revenue Code provisions, and plan-level rules that govern how tax-advantaged retirement savings are transferred at death. The primary governing statute is the Internal Revenue Code (26 U.S.C. §§ 401–409A), which establishes the tax treatment of qualified plans, IRAs, and Roth accounts. The Employee Retirement Income Security Act of 1974 (ERISA, 29 U.S.C. § 1001 et seq.) governs employer-sponsored plans such as 401(k), 403(b), and pension plans, while IRAs are governed primarily by the IRC without ERISA coverage.

The major account types subject to estate planning rules include:

1. Traditional IRAs — Pre-tax contributions; distributions taxed as ordinary income; subject to Required Minimum Distributions (RMDs) beginning at age 73 under SECURE 2.0.
2. Roth IRAs — After-tax contributions; qualified distributions are tax-free; original owner has no RMD requirement during lifetime.
3. 401(k) and 403(b) plans — Employer-sponsored qualified plans; subject to both IRC and ERISA rules; plan documents may impose additional constraints on beneficiary options.
4. SEP and SIMPLE IRAs — Simplified employer plans; follow IRA distribution rules at death.
5. Defined Benefit Pension Plans — Governed by ERISA; spousal rights under the Qualified Joint and Survivor Annuity (QJSA) rules require spousal consent for non-spousal beneficiary designations.

Because retirement accounts pass by beneficiary designation rather than through a will or trust, they are classified as non-probate assets. A will does not control who inherits a retirement account; the account's beneficiary designation form does.

How It Works

Beneficiary Designation Mechanics

The account owner designates primary and contingent beneficiaries on forms maintained by the plan administrator or IRA custodian. If no valid beneficiary is named — or if all named beneficiaries predecease the owner — the account passes to the owner's estate, losing access to individual life-expectancy-based distribution options.

Under 26 U.S.C. § 401(a)(9) and the Treasury Regulations thereunder, designated beneficiaries must generally be identifiable individuals (or qualifying trusts or entities) determined as of September 30 of the year following the account owner's death.

SECURE Act and SECURE 2.0 Distribution Rules

The Setting Every Community Up for Retirement Enhancement Act of 2019 (SECURE Act, Pub. L. 116-94) eliminated the "stretch IRA" for most beneficiaries, replacing it with a 10-year rule. SECURE 2.0 (Pub. L. 117-328), enacted in December 2022, further adjusted RMD ages and added clarifications.

The post-SECURE Act framework divides beneficiaries into three categories:

1. Eligible Designated Beneficiaries (EDBs) — Permitted to use life-expectancy distributions (the former "stretch"). EDBs include:
2. Surviving spouses
3. Minor children of the account owner (until majority)
4. Disabled individuals (as defined under 26 U.S.C. § 72(m)(7))
5. Chronically ill individuals

6. Individuals not more than 10 years younger than the decedent

7. Designated Beneficiaries (DBs) — Subject to the 10-year rule: the inherited account must be fully distributed by December 31 of the 10th year following the account owner's death. If the decedent had already begun RMDs, annual distributions are also required during the 10-year period (per IRS proposed regulations under REG-105954-20).

8. Non-Designated Beneficiaries — Estates, most charities, and certain trusts. These must distribute within 5 years of death (if the owner died before RMD age) or over the owner's remaining life expectancy (if after RMD age).

Spousal Rollover Rights

A surviving spouse has options unavailable to other beneficiaries. Under 26 U.S.C. § 402(c)(9), a surviving spouse may roll an inherited retirement account into their own IRA, deferring distributions under their own RMD timeline. This is the most tax-efficient option available to a surviving spouse and is unavailable to any other beneficiary class.

Trusts as Beneficiaries

Naming a trust as beneficiary is permissible but requires structural precision. To qualify for look-through treatment — allowing the trust's individual beneficiaries to be treated as designated beneficiaries — the trust must satisfy four requirements under Treasury Regulation § 1.401(a)(9)-4: the trust must be valid under state law, be irrevocable or become irrevocable at death, have identifiable beneficiaries, and documentation must be provided to the plan administrator by October 31 of the year following death. For estate planning using trust law foundations, the conduit trust and accumulation trust are the two primary structures, each carrying different income tax exposure under the post-SECURE Act rules.

Common Scenarios

Scenario 1: Spouse as Primary Beneficiary, Adult Children as Contingent

The most common arrangement. The surviving spouse rolls the account into their own IRA, restarting the RMD clock. Adult children inherit under the 10-year rule after the surviving spouse's death. This structure preserves maximum tax deferral for the first-generation transfer but compresses income recognition for children, particularly if they are in peak earning years.

Scenario 2: Minor Child Named as Primary Beneficiary

A minor child qualifies as an EDB but only until reaching the age of majority under state law (generally 18 or 21). At majority, the 10-year rule begins. A 15-year-old child, for example, would have a 3-to-7-year life-expectancy period plus 10 years — not an indefinite stretch. This scenario intersects with minor beneficiary legal protections and may require a custodial arrangement or trust to manage distributions.

Scenario 3: Conduit Trust Named as Beneficiary

A conduit trust passes all RMDs through to the current beneficiary annually. Post-SECURE Act, under the 10-year rule for non-EDB beneficiaries, the conduit trust must distribute the entire account balance by year 10. This prevents accumulation inside the trust. By contrast, an accumulation trust retains distributions but exposes them to compressed trust income tax rates — reaching the 37% bracket at $15,200 of taxable income for 2024 (IRS Rev. Proc. 2023-34).

Scenario 4: Roth IRA Inherited by Non-Spouse

Roth IRAs inherited by a non-spouse designated beneficiary are subject to the 10-year rule, but distributions are generally income-tax-free. No annual RMDs are required during the 10-year window, giving the beneficiary flexibility to time distributions strategically. The estate planning utility of Roth accounts is covered within the broader estate planning legal framework.

Scenario 5: Employer Plan with ERISA Spousal Rights

In an employer-sponsored 401(k), ERISA mandates that the spouse is the automatic beneficiary. Designating a non-spouse beneficiary requires notarized spousal consent under 29 U.S.C. § 1055. This requirement does not apply to IRAs, which are not ERISA-governed. The distinction between ERISA plans and IRAs is a critical classification boundary in estate administration.

Decision Boundaries

The legal rules governing retirement accounts create discrete decision points that produce materially different outcomes:

Spouse vs. Non-Spouse Beneficiary
The spousal rollover right creates a bifurcation that no other beneficiary can access. This single distinction determines whether distributions can be deferred for decades or must be completed within 10 years.

Designated Beneficiary vs. Non-Designated Beneficiary
Naming an estate or a non-qualifying trust