A son in Brooklyn receives a letter from his late father’s employer. He’s the named beneficiary of a 401(k) holding a significant balance—the result of decades of disciplined saving. His first thought is to cash it out, pay off his mortgage, and handle other immediate expenses. While understandable, this is often the most costly mistake a beneficiary can make, potentially sacrificing a large portion of the inheritance to unnecessary, immediate taxation.
Inheriting a retirement account is not like inheriting a bank account or a piece of real estate. It comes with a specific set of federal rules and deadlines that, if ignored, can undermine the very legacy your loved one intended to leave. The stewardship of these assets begins the moment you are notified.
The 10-Year Rule: A New Reality for Beneficiaries
For years, a non-spouse beneficiary could “stretch” distributions from an inherited IRA or 401(k) over their own lifetime, allowing the account to grow tax-deferred for decades. The SECURE Act of 2019 changed that landscape completely. For most non-spouse beneficiaries who inherit an account from someone who passed away after December 31, 2019, the entire balance of the 401(k) must be withdrawn within 10 years of the original owner’s death.
There is no annual distribution requirement during this 10-year window, but by the end of the tenth year, the account must be empty. This rule forces a compressed timeline for tax planning. That lump-sum withdrawal that seemed so appealing can push you into a much higher income tax bracket for the year, a painful and often avoidable outcome.
Certain beneficiaries are exempt from this 10-year rule:
- The surviving spouse
- Minor children of the account owner (the 10-year clock begins when they reach the age of majority)
- Disabled or chronically ill individuals
- Beneficiaries who are not more than 10 years younger than the decedent
For everyone else—typically adult children, grandchildren, or siblings—this 10-year clock is the governing principle. Your strategy must be built around it.
Your Relationship to the Deceased Dictates Your Options
The path forward depends entirely on your relationship with the original account holder. The law creates two distinct classes of beneficiaries with very different rights.
If You Are the Surviving Spouse
A surviving spouse has the most flexibility. In my practice, we generally review three primary paths for a surviving spouse:
- Treat the 401(k) as your own. This is often accomplished by rolling the funds into your own new or existing IRA. This is the most common choice, as it allows you to consolidate accounts and lets the funds continue to grow tax-deferred under your own name. Your required minimum distributions (RMDs) will be based on your own age, not your late spouse’s.
- Roll it into an Inherited IRA. You can move the funds into a specially titled inherited IRA. This can be a prudent choice if you are under age 59½ and may need access to the funds. Withdrawals from an inherited IRA are not subject to the 10% early withdrawal penalty.
- Remain a beneficiary of the 401(k). Some 401(k) plans allow a surviving spouse to simply remain a beneficiary of the existing account, but this is often restrictive and not the preferred option.
If You Are a Non-Spouse Beneficiary
For a child, sibling, or other non-spouse beneficiary, the primary tool for managing the inheritance is the inherited IRA. You cannot roll the 401(k) into your own existing IRA. Instead, you must direct the 401(k) plan administrator to make a direct trustee-to-trustee transfer into a newly created inherited IRA, titled in a specific way (e.g., “[Decedent’s Name], deceased, for the benefit of [Your Name], Beneficiary”).
This step is critical. It keeps the assets in a tax-advantaged account, allowing them to potentially grow while you plan distributions over the 10-year period. Taking a check made out to you personally, even with the intent to deposit it into an IRA, is considered a full distribution and immediately triggers income tax on the entire amount.
Beneficiary Designations Trump Your Will
The beneficiary designation form on file with the 401(k) plan administrator is a powerful legal document. It operates as a direct contract, and it almost always overrides what is written in a will.
In New York, this is a well-established principle of law. Assets with a named beneficiary—like life insurance policies and retirement accounts—are considered non-probate assets. They pass outside the will and are not subject to the delays and oversight of the Surrogate’s Court. This is affirmed in statutes like New York’s Estates, Powers and Trusts Law (EPTL) § 13-3.2, which validates these “will substitutes.” If your father’s will says his estate is to be split equally between you and your sister, but you are the only one named on his 401(k) beneficiary form, the entire account belongs to you. Period.
This is a frequent source of conflict in families, and it underscores the importance of not just creating a will, but coordinating beneficiary designations across all accounts to reflect your true intentions.
The decisions you make in the first few months after inheriting a 401(k) will have tax and financial consequences for the next decade. This is not a simple administrative task; it is the first act of financial stewardship for a legacy that was entrusted to you. Rushing the process is a mistake.
Before you complete any paperwork from a plan administrator, a prudent first step is to schedule a consultation to map out a distribution strategy that aligns with your financial situation and honors the intent behind the inheritance.
