Your 401(k) goes to your named beneficiary — not through your will or probate. Spouses get the most flexibility (they can roll it into their own IRA). Non-spouse beneficiaries must empty the account within 10 years under the SECURE Act.
Who Inherits Your 401(k)
| Beneficiary Status | What Happens |
|---|---|
| Named beneficiary (spouse) | Spouse inherits; can roll to own IRA |
| Named beneficiary (non-spouse) | Inherits; must follow 10-year rule |
| No beneficiary named (married) | Spouse inherits by default (ERISA) |
| No beneficiary named (single) | Goes to estate — subject to probate |
| Ex-spouse still listed | Ex-spouse inherits (update your beneficiary!) |
Spousal vs. Non-Spouse Beneficiary Options
| Option | Spouse | Non-Spouse |
|---|---|---|
| Roll into own IRA | ✅ Yes | ❌ No |
| Stretch over life expectancy | ✅ Yes | ❌ No (10-year rule) |
| Delay withdrawals until own RMD age | ✅ Yes | ❌ No |
| Take lump sum | ✅ Yes | ✅ Yes |
| 10-year distribution | ✅ Optional | ✅ Required |
| Remain as beneficiary of the plan | ✅ Yes | ✅ Yes (some plans) |
The 10-Year Rule (SECURE Act)
| Category | 10-Year Rule Applies? | Alternative |
|---|---|---|
| Spouse | ❌ No (can use own life expectancy) | Roll to own IRA |
| Minor child | ❌ No (until age of majority, then 10-year clock starts) | Life expectancy until 21 |
| Disabled beneficiary | ❌ No | Life expectancy |
| Chronically ill beneficiary | ❌ No | Life expectancy |
| Beneficiary < 10 years younger than deceased | ❌ No | Life expectancy |
| All other non-spouse beneficiaries | ✅ Yes | Must empty within 10 years |
Tax Impact for Beneficiaries
$500,000 traditional 401(k) inherited by non-spouse beneficiary (22% bracket):
| Strategy | Annual Withdrawal | Tax per Year | Total Taxes |
|---|---|---|---|
| Withdraw evenly over 10 years | $50,000/year | $11,000 | $110,000 |
| Wait and withdraw in year 10 | $500,000 in year 10 | $150,000+ | $150,000+ |
| Strategic withdrawals in low-income years | Varies | Varies | Can minimize significantly |
Spreading withdrawals over 10 years keeps you in a lower tax bracket. Waiting until year 10 creates a massive tax bill.
Roth 401(k) Inheritance
| Detail | Traditional 401(k) | Roth 401(k) |
|---|---|---|
| Beneficiary pays income tax | ✅ Yes | ❌ No (tax-free) |
| 10-year rule applies (non-spouse) | ✅ Yes | ✅ Yes |
| Spouse can roll to own Roth IRA | ✅ Yes (to traditional IRA) | ✅ Yes |
| RMDs for beneficiary | ✅ Yes | ✅ Yes (but tax-free) |
What You Need to Do Now
| Action | Why |
|---|---|
| Name a beneficiary | Without one, funds go to estate (probate, delays, possible wrong recipient) |
| Name contingent beneficiaries | Backup if primary beneficiary dies first |
| Update after life events | Marriage, divorce, birth, death |
| Review every 1-2 years | Beneficiary forms override your will |
| Inform beneficiaries | They need to know the account exists and where it’s held |
The Bottom Line
Your 401(k) beneficiary designation is the most important estate planning document most people overlook. It overrides your will. Name a beneficiary, name a contingent, and update after every major life event. For beneficiaries: spouses should roll to their own IRA, and non-spouse beneficiaries should spread withdrawals over 10 years to minimize the tax hit.
Related: What Happens to Your IRA When You Die? | What Happens to Your 401(k) When You Quit?