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- The plan’s records usually control payment
- Marriage creates special spousal protections
- Divorce involves both federal and state law
- The beneficiary form and the distribution rules answer different questions
- Receiving the account can create taxable distributions
- Several documents can answer different parts of the question
- Sources
Key Facts
- Federal level: A 401(k) beneficiary is the person or entity entitled under the plan’s terms and procedures to receive the participant’s remaining account after death.
- Federal level: ERISA-covered plans generally administer benefits according to governing plan documents and the beneficiary designation on file.
- Federal level: A surviving spouse has special federal protections, and many 401(k) plans require witnessed written spousal consent before naming someone else.
- Federal level: The beneficiary’s identity and status affect the timing, rollover possibilities, and federal income-tax treatment of inherited 401(k) distributions.
- Federal and state: Divorce and inheritance involve state law, but state documents do not automatically displace ERISA plan terms or federal QDRO rules.
A 401(k) beneficiary is not simply the person a participant expects will inherit the account. It is the person or entity recognized under the retirement plan’s governing documents and designation procedures. That distinction matters because a 401(k) is an employer plan governed by federal benefit and tax rules, not an ordinary bank account passing only under a will.
A participant may name a primary beneficiary and, if the plan permits, a contingent beneficiary who takes if the primary beneficiary cannot. The plan document controls available choices and the method for making or changing a designation.
The plan’s records usually control payment
ERISA requires plan fiduciaries to act in accordance with the documents and instruments governing the plan, so long as those documents are consistent with federal law. This plan-documents rule gives administrators a uniform record for deciding whom to pay.
The Supreme Court applied that principle in Kennedy v. Plan Administrator for DuPont Savings and Investment Plan. The administrator properly paid the former spouse named on the plan’s designation form even though a divorce decree contained a waiver, because the participant had not changed the beneficiary under the plan’s procedures.
The decision does not mean every divorce produces the same result. It shows why a will, informal promise, or separate agreement cannot be assumed to replace the designation maintained by an ERISA plan.
Marriage creates special spousal protections
Federal law gives surviving spouses special rights in covered retirement plans. For many individual account plans, the statutory structure makes the participant’s vested benefit payable to the surviving spouse unless there is no surviving spouse or the spouse consents to another beneficiary in the required manner.
When spousal consent is required, it generally must be in writing, acknowledge the effect of the election, and be witnessed by a plan representative or notary. The exact requirement depends on the plan’s form of benefit and the federal survivor-annuity rules that apply to that plan.
Marriage can therefore change the legal effect of an older beneficiary designation. Naming a child, trust, or other person while unmarried does not establish that the same designation will remain effective after marriage without any additional step under the plan.
Divorce involves both federal and state law
State family law ordinarily governs divorce and the division of marital property. ERISA and the Internal Revenue Code add federal requirements when a domestic-relations order assigns an interest in an employer retirement plan.
A qualified domestic relations order, commonly called a QDRO, is a state domestic-relations order that satisfies detailed federal requirements. A QDRO can recognize an alternate payee’s right to receive all or part of plan benefits, but an ordinary divorce decree is not automatically a QDRO.
This is a genuine federal-state boundary: state law creates the domestic-relations order, while federal law determines whether the order qualifies for the ERISA exception and can be administered by the plan. General beneficiary terminology outside retirement plans does not resolve that specialized question.
The beneficiary form and the distribution rules answer different questions
The designation process identifies who may receive the account. Required minimum distribution rules determine how quickly an inherited account must be distributed after the participant’s death.
For deaths after 2019, a designated beneficiary who is not an eligible designated beneficiary generally falls under a 10-year rule. Federal law recognizes exceptions for an eligible designated beneficiary, a category that includes a surviving spouse, the participant’s minor child, a disabled or chronically ill individual, and a person not more than ten years younger than the participant.
The plan document may limit which distribution options it offers while still satisfying federal minimum-distribution law. A spouse can have options unavailable to a nonspouse beneficiary, and a trust or estate can be treated differently from an individual.
The timing rules are detailed enough that 401(k) beneficiary rules after death require attention to the participant’s death date, required beginning date, beneficiary category, and plan terms.
Receiving the account can create taxable distributions
Traditional 401(k) money generally has not yet been included in the participant’s taxable income. A beneficiary therefore generally includes taxable distributions in gross income in the same basic manner the participant would have, subject to special rules and any after-tax basis in the account.
Inherited Roth 401(k) amounts follow different income-tax rules, although post-death minimum-distribution requirements still apply. A beneficiary designation alone does not establish whether a particular payment is taxable.
Rollovers also differ by beneficiary status and distribution type. The broader federal tax treatment of 401(k) withdrawals is separate from the threshold question of who the plan recognizes as beneficiary.
Several documents can answer different parts of the question
The beneficiary designation shows the name currently recorded by the plan. The summary plan description explains general eligibility, benefit, claim, and distribution provisions, while the formal plan document supplies the controlling plan terms.
A marriage certificate, divorce decree, QDRO, trust, or will may also matter, but each has a different legal role. None should be treated as an automatic substitute for the plan’s own records and federal requirements.
If no valid beneficiary survives, the plan’s default-beneficiary provision determines the next recipient. That provision may identify a spouse, descendants, an estate, or another order of payment, so there is no universal federal default sequence for every 401(k).
Sources
- 29 U.S.C. § 1055, federal survivor-benefit requirements
- 29 U.S.C. § 1104, ERISA fiduciary duties
- Supreme Court opinion in Kennedy v. Plan Administrator for DuPont
- IRS retirement plan beneficiary guidance
- IRS required minimum distribution FAQs
- IRS guidance on retirement plans after a spouse’s death
- Department of Labor guide to QDROs
- Treasury Decision 10001, final required minimum distribution regulations
