A contingent beneficiary on a 401(k) is the backup person or entity you name to inherit the account if your primary beneficiary can’t. The contingent only steps in when every primary beneficiary has died before you or formally refused the money. Naming one keeps the account out of probate and controls who actually receives your retirement savings.
When the Contingent Beneficiary Actually Inherits
Your 401(k) beneficiary form creates a strict chain. The primary beneficiary has first claim. If that person is alive and willing to take the money, the contingent receives nothing. You can name several primaries and split the account by percentage, and the contingent layer activates only when every primary is unavailable.
There are two ways a primary becomes unavailable. The first is death before the account owner. The second is a qualified disclaimer, which is a formal written refusal signed by the person turning down the inheritance and delivered to the plan administrator within nine months of the account owner’s death.1eCFR. 26 CFR 25.2518-2 – Requirements for a Qualified Disclaimer People sometimes disclaim for tax reasons, pushing assets down to a contingent in a lower bracket.
One thing to keep in mind: the beneficiary designation on the 401(k) legally overrides your will. Whatever the form says is what the plan administrator follows.
Spouses Come First Under Federal Law
If you’re married, federal law limits who you can name. Under ERISA, your spouse automatically has rights to your 401(k) balance when you die.2U.S. Department of Labor. FAQs about Retirement Plans and ERISA To name anyone other than your spouse as primary or contingent, your spouse must sign a written consent acknowledging what they’re giving up, witnessed by a plan representative or notary.3GovInfo. 29 USC 1055 – Requirement of Joint and Survivor Annuity and Preretirement Survivor Annuity
Without that signed waiver, the spouse takes the full balance no matter who’s listed. This applies to employer plans like 401(k)s. IRAs are not covered by the same federal rule, though some community property states impose their own.
How to Name and Update a Contingent Beneficiary
The plan administrator provides a beneficiary designation form, on paper or through the plan’s portal. It asks for each beneficiary’s full legal name, date of birth, Social Security number, and the percentage share. You can split the contingent share among several people the same way you can with primaries.
The harder part is keeping the form current. The plan administrator is legally bound to pay whoever appears on the most recent valid form, even if it no longer reflects what you’d want. Marriage, divorce, a birth, or the death of a named beneficiary should all trigger an update. A named beneficiary who died years ago receives nothing, and if you never named a replacement, the account can end up defaulting to your estate.
Divorce Is the Biggest Trap
Many states have laws that automatically strip an ex-spouse of beneficiary status after divorce. Those state laws do not apply to 401(k)s. ERISA preempts them, and the plan administrator must pay whoever is on the form — even if that person is your ex.
A divorce decree by itself does not change your beneficiary designation. Dividing or redirecting 401(k) benefits usually requires a Qualified Domestic Relations Order, a court order that meets specific federal requirements and tells the plan administrator to recognize someone other than the participant.4U.S. Department of Labor. QDROs – An Overview FAQs Even with a QDRO, file a fresh beneficiary form with your updated choices.
Per Stirpes or Per Capita
Most forms offer a choice that controls what happens to a deceased beneficiary’s share. It only matters when you’ve named more than one beneficiary and one dies before you.
Per stirpes sends a deceased beneficiary’s share down to their children. Name your two adult children as equal contingent beneficiaries, one dies before you, and that child’s half goes to their kids. Your surviving child still gets 50 percent.
Per capita divides the account evenly among all surviving beneficiaries and the descendants of any deceased beneficiary, regardless of generation. Same setup, different result: everyone in the pool takes an equal slice.
If you pick neither, most plans default to splitting the account among surviving beneficiaries only. Under that default, a deceased beneficiary’s children may get nothing.
Naming a Minor Child
You can name a child as contingent beneficiary, but a minor can’t legally control retirement funds. If a child under 18 (or 21 in some states) inherits a 401(k) directly, a court typically appoints a guardian to manage the money until the child reaches adulthood. That adds cost and delay, and once the child reaches the age of majority, they get unrestricted access to the full balance.
Naming a trust for the child’s benefit gives you more control — a trustee, distribution conditions, and no forced lump sum at 18. The tradeoff is the cost of drafting the trust and the complexity of the tax rules that follow.
A minor child of the deceased account owner does get a distribution break. Under the SECURE Act, a minor child of the owner is an Eligible Designated Beneficiary and can stretch distributions over their life expectancy until the age of majority, at which point the 10-year clock starts.5Internal Revenue Service. Retirement Topics – Beneficiary
Trusts as Contingent Beneficiary
A trust can be named as your contingent beneficiary, but only a trust that meets IRS “see-through” requirements gets the same distribution treatment as an individual. To qualify, the trust must be valid under state law, become irrevocable at death, have identifiable beneficiaries in the document, and have documentation provided to the plan administrator by October 31 of the year following the account owner’s death.6Internal Revenue Service. Internal Revenue Bulletin 2024-33
A trust that fails any of these is treated like an estate for payout purposes, which forces a faster distribution and loses the stretch options available to individuals.
Distribution Rules Once a Contingent Inherits
When a contingent beneficiary actually inherits, how long they have to empty the account depends on who they are and whether the original owner had already started required minimum distributions. The SECURE Act rewrote most of this for deaths after 2019.
The 10-Year Rule
Most non-spouse contingent beneficiaries must empty the inherited 401(k) by December 31 of the tenth year after the account owner’s death.5Internal Revenue Service. Retirement Topics – Beneficiary How you space the withdrawals depends on whether the owner had reached their required beginning date for RMDs. If they died before that date, you can pull money out on any schedule as long as the account is empty by year 10. If they had already started RMDs, you must continue annual distributions during the 10 years and empty the account by the deadline.
Missing a required annual distribution triggers an excise tax on the shortfall.7Office of the Law Revision Counsel. 26 USC 4974 – Excise Tax on Certain Accumulations in Qualified Retirement Plans
Eligible Designated Beneficiaries
Some beneficiaries are exempt from the 10-year rule and can stretch distributions over their own life expectancy:
- A surviving spouse, who can also roll the funds into their own IRA or 401(k) and delay distributions until their own RMD age
- A minor child of the deceased, until the age of majority
- A disabled or chronically ill individual, as defined under the Internal Revenue Code
- Anyone no more than 10 years younger than the deceased owner5Internal Revenue Service. Retirement Topics – Beneficiary
The Five-Year Rule
When the contingent beneficiary is not a person — an estate, a charity, or a trust that doesn’t qualify as see-through — the account generally must be fully distributed by the end of the fifth year after the owner’s death.5Internal Revenue Service. Retirement Topics – Beneficiary No withdrawals are required before that deadline, but the compressed timeline makes tax planning harder.
Tax Treatment When the Contingent Beneficiary Withdraws
Everything distributed from an inherited traditional 401(k) is taxed as ordinary income in the year the beneficiary takes it. The contributions went in pre-tax, so the full withdrawal hits the beneficiary’s return. A lump sum can push someone into a much higher bracket for that year, which is why spreading distributions across the 10-year window usually makes sense when the rules allow it.
A surviving spouse has the most room. Rolling the inherited 401(k) into their own IRA resets the clock, and nothing is owed until they hit their own RMD age. No other beneficiary gets this.
If the inherited account is a Roth 401(k), distributions of both contributions and earnings are generally tax-free as long as the original owner held the Roth for at least five years before death.5Internal Revenue Service. Retirement Topics – Beneficiary The 10-year deadline still applies, but the withdrawals don’t create a tax bill.
When a Trust or Estate Is the Beneficiary
Trusts and estates use a heavily compressed bracket structure. For 2026, the highest federal income tax rate hits trust income above roughly $16,000, a threshold an individual would not reach until their income was in the hundreds of thousands. A $200,000 inherited 401(k) taxed inside a trust can face a far bigger bill than the same amount distributed to an individual.
A trust can avoid the squeeze by passing distributions through to its individual beneficiaries in the same tax year so the income is taxed at each person’s rate. The trust has to be structured to allow this, and the trustee has to actually make the distributions.
Charity as Contingent
Naming a qualified charity as contingent beneficiary avoids income tax on the distribution entirely. The charity owes no income tax, and the estate can claim a charitable deduction. Some account owners route the 401(k) to charity and leave taxable assets to family for exactly this reason. It only works when the charity is named on the beneficiary form; a charitable bequest through a will does not produce the same result for retirement accounts.
What Happens With No Contingent Beneficiary
If every named beneficiary has died and no contingent is on file, the 401(k) typically defaults to the account owner’s estate. A surviving spouse still inherits automatically under ERISA. For everyone else, the account enters probate. Probate is public, often slow, and the executor distributes the funds under the will or state intestacy law.
The distribution rules also get worse. An estate is not an individual, so the five-year rule applies instead of the 10-year rule.5Internal Revenue Service. Retirement Topics – Beneficiary Probate costs, a compressed payout, and potentially higher taxes are the price of a blank contingent line on a form that takes minutes to fill out.