Overview
One advantage of a 401(k) plan is that taxes on compensation are deferred until the time amounts are actually received — presumably upon retirement. In general, 401(k) plans are taxed the same way as other qualified plans:
- Earnings escape current taxation while contributions remain in the account
- 10% penalty tax on premature withdrawals
- Required minimum distributions beginning at age 73 (SECURE Act 2.0)
Unlike other qualified plans, 401(k)s may allow premature withdrawals to participants experiencing financial hardship, and many 401(k) plans offer participant loans.
The Retirement Equity Act of 1984 requires plans to pay retirement benefits to married participants in the form of qualified joint and last survivor annuities, protecting a spouse from being left with nothing if the retired employee dies. Any distributions from the account require the written consent of the spouse.
Distribution Options
When a participant elects to begin receiving distributions, he or she generally may choose one of three methods:
- Lump sum — withdraw the entire account balance in a single year; may be eligible for special tax treatment
- Installment distributions — receive periodic payments based on life expectancy or joint life expectancy, with the option to accelerate payments later
- Annuity — purchase an annuity from an insurance company providing a life annuity or joint life annuity; distributions are made according to the annuity contract terms
Income Taxation of Distributions
Contributions are not taxed when made to the plan. Taxation is deferred until amounts are distributed to the participant. Voluntary after-tax contributions are received tax-free; all other amounts (elective deferrals, employer contributions, and all earnings) are taxable as ordinary income.
A lump-sum distribution is a payout of an employee’s entire account balance within a single tax year. Two tax options are generally available:
- Ordinary income — include the entire taxable distribution in gross income for the year
- Ten-year forward averaging — divides the distribution by 10, applies the 1986 tax rates to that amount, then multiplies by 10 for the total tax liability (owed in the year of distribution). Available only to those born before January 1, 1936, with at least five years of plan participation. May be used only once in a lifetime. Not available if the payout is due to plan termination.
Employees who receive distributions over a number of years — via annuity or installments — have each payment taxed under the annuity rules. A portion corresponding to after-tax contributions is received tax-free (the exclusion ratio); the remainder is ordinary income. If the annuitant outlives the life expectancy, the entire annuity payment becomes taxable thereafter. If the annuitant dies before recovering all after-tax contributions, the estate may claim a deduction on the final return.
Della retires and her 401(k) balance is $174,000, of which $45,000 is voluntary after-tax contributions. She purchases a 10-year annuity paying $25,000/year.
| Item | Amount |
|---|---|
| Investment in contract (after-tax contributions) | $45,000 |
| Expected return ($25,000 × 10 years) | $250,000 |
| Exclusion ratio ($45,000 ÷ $250,000) | 18% |
| Annual exclusion (18% × $25,000) | $4,500 |
| Taxable portion of each annual payment | $20,500 |
An employee who withdraws funds before final distribution must calculate the tax-free portion attributable to after-tax contributions. The exclusion ratio is based on the cost basis in the employee’s separate account divided by the total value of that account.
Della (age 58) withdraws $12,000 before retiring. Her after-tax contributions of $45,000 have earned $15,000, creating a $60,000 separate account.
Exclusion ratio: $45,000 ÷ $60,000 = 75%. Tax-free portion: 75% × $12,000 = $9,000. Taxable portion: $3,000.
Since Della is under age 59½, the $3,000 taxable portion is also subject to the 10% premature withdrawal penalty.
Premature Withdrawals
The tax code imposes a 10% penalty on withdrawals before “retirement,” in addition to any ordinary income tax owed. Funds may be withdrawn penalty-free:
- When the employee reaches age 59½
- Upon the employee’s retirement or separation from service
- If the employee dies or is permanently disabled
- As a result of a divorce decree (QDRO)
- Retiring between age 55 and 59½ under the plan’s early retirement provisions
- As a series of substantially equal periodic payments over the participant’s lifetime or life expectancy
- To cover significant medical expenses exceeding 7.5% of adjusted gross income
- Upon sale of the business to an unrelated party where the employee continues with the purchaser
- Upon termination of the plan without a successor plan
- As a plan loan (if permitted by the plan documents)
- As a rollover contribution to another qualified plan or IRA
A unique advantage of 401(k) plans is the ability to permit early withdrawals for financial hardship. To qualify, the participant must have an immediate and heavy financial need and lack other readily available resources to meet it. Withdrawals are limited to the amount needed to satisfy the hardship. Financial hardships need not be emergencies — they may be foreseeable or voluntarily incurred (e.g., purchase of a residence, college tuition).
The IRS recognizes the following as qualifying hardship events:
- Medical expenses for the employee, spouse, dependents, or named beneficiaries
- Costs related to the purchase of a principal residence (not regular mortgage payments)
- Tuition and related educational fees for the next 12 months of post-secondary education for the employee, spouse, dependents, or named beneficiaries
- Payments to prevent eviction from, or foreclosure on, the employee’s principal residence
- Expenses for funeral or burial costs for a family member
- Expenses to repair damage to the employee’s principal residence that would qualify for a casualty deduction
The Pension Protection Act of 2006 expanded the list to include named beneficiaries — allowing hardship distributions for financial emergencies affecting parents, siblings, domestic partners, and other non-dependents named as plan beneficiaries.
The maximum hardship distribution is the lesser of the actual financial need (less other available resources) or the total of the employee’s elective contributions less prior hardship distributions. As a condition, the plan may not accept elective or voluntary contributions from the employee for at least 6 months after the hardship distribution.
If the participant dies, savings pass to the beneficiary or estate. Distributions to beneficiaries under age 59½ are not subject to the 10% premature penalty. The beneficiary must report the distribution as income.
The participant may name primary and contingent beneficiaries — human beings or entities (such as charities). If no beneficiary is named or all named beneficiaries predecease the participant, benefits pass to the participant’s estate.
General rule: beneficiaries must withdraw the entire plan balance within 10 years after the participant’s death (updated under the SECURE Act from the prior 5-year rule for most non-spouse beneficiaries). Charities and estates must follow the 10-year rule; they have no life expectancy.
A surviving spouse who is the sole beneficiary may:
- Withdraw the entire amount within 10 years
- Take distributions over the surviving spouse’s own life expectancy, beginning by the date the deceased participant would have reached age 73
- Roll the balance over to an IRA in his or her own name and delay RMDs until age 73
Nonspousal beneficiaries generally must withdraw the entire balance within 10 years after the participant’s death. Eligible designated beneficiaries (minor children of the participant, disabled or chronically ill individuals, and individuals not more than 10 years younger than the participant) may take distributions over their own life expectancy.
A “disabled person” is one who is unable to engage in any substantial gainful activity due to a medically determinable physical or mental impairment expected to result in death or be of long or indefinite duration. Once disability is established by a physician’s certified medical report, the 10% premature penalty is waived. Distributions are still reportable as ordinary income.
Distributions received pursuant to a Qualified Domestic Relations Order (QDRO) are penalty-free before age 59½. The former spouse receiving the distribution may either report it as income or roll it over to an IRA.
A distribution is not treated as premature if the participant separated from service, the distribution is made under the plan’s early retirement provisions, and the participant is age 55 or older at separation.
Distributions may be received penalty-free before age 59½ if made in a series of substantially equal installments over the participant’s life expectancy (or joint life expectancy), paid at least annually. The participant faces severe penalties if the payment schedule is modified before reaching age 59½.
A 401(k) plan must be permanent as a matter of law, but may be terminated for legitimate business reasons: going out of business, business reorganization, or excessive cost. When a plan terminates, all accrued benefits immediately become fully vested. The employer must file documentation with the IRS. A distribution due to plan termination is not subject to the 10% premature penalty but is taxed as ordinary income unless rolled over. A successor plan may not be established within 12 months, otherwise the assets must roll into the new plan.
Required Minimum Distributions (RMDs)
The law requires distributions to begin once the participant reaches a certain age — savings cannot remain in a tax shelter indefinitely. Under SECURE Act 2.0, mandatory annual distributions must begin no later than April 1 following the year the participant turns age 73 (age 75 for those born after December 31, 1959, beginning in 2033). Participants who continue working may delay RMDs until retirement, except for 5%+ owners who must begin at age 73 regardless.
The April 1 deadline applies only to the initial RMD. Subsequent annual distributions must be taken by December 31 of each year. Delaying the first distribution until April 1 means taking two distributions in the same tax year, potentially increasing the tax bracket.
Thomas O’Neil turns age 73 in September 2026. His required distributions must be made by:
| Distribution | Deadline |
|---|---|
| 2026 initial distribution | April 1, 2027 |
| 2027 required distribution | December 31, 2027 |
| 2028 required distribution | December 31, 2028 |
Note: If Thomas delays the initial distribution to April 1, 2027, he will take two distributions in 2027 — potentially pushing him into a higher tax bracket. It may be advantageous to take the first distribution by December 31, 2026.
Under SECURE Act 2.0, the penalty for failing to take the required minimum distribution is 25% of the shortfall (reduced from the prior 50% rate). If the error is corrected within a two-year correction window, the penalty is further reduced to 10%.
To calculate the minimum distribution allowance, divide the account balance as of December 31 of the prior year by the participant’s life expectancy from the applicable IRS table. The IRS provides three tables: the Uniform Lifetime Table (most participants), the Single Life Expectancy Table (certain beneficiaries), and the Joint and Last Survivor Table (participants whose sole beneficiary is a spouse more than 10 years younger).
| Age | IRS Uniform Lifetime Table Distribution Period |
|---|---|
| 73 | 26.5 years |
| 74 | 25.5 years |
| 75 | 24.6 years |
| 76 | 23.7 years |
| 77 | 22.9 years |
| 78 | 22.0 years |
A participant who is age 73 has a 401(k) balance of $131,000 on December 31 of the prior year. Using the Uniform Lifetime Table, the distribution period at age 73 is 26.5 years.
Minimum distribution allowance = $131,000 ÷ 26.5 = $4,943 for the current year.
Each year the participant recalculates using the updated account balance and the distribution period corresponding to the current age. The Joint Life table (available only when the sole beneficiary is a spouse at least 10 years younger) produces longer distribution periods and therefore smaller, more tax-efficient annual distributions.
The IRS may waive the RMD penalty if the participant establishes that the shortfall was due to reasonable error and that appropriate corrective steps are being taken. Qualifying errors include incorrect advice from a plan sponsor or consultant, a calculation error, or a misunderstanding of the rules. The participant must still pay the penalty, attach a waiver request and explanation to the tax return, and await the refund if the waiver is granted.
Employment Taxes & Withholding on Distributions
Elective contributions are excluded from federal income tax, but are included in the FICA (Social Security and Medicare) and FUTA (federal unemployment) wage bases. Employer matching and nonelective contributions are not subject to FICA, FUTA, or federal income taxes.
Plan administrators must withhold income tax on the taxable portion of distributions. The amount varies by distribution type:
- Periodic payments (annuities): withheld as if the payments were wages; recipients are treated as married filing jointly with three exemptions by default, but may elect out using Form W-4P
- Nonperiodic distributions eligible for rollover but not directly transferred: mandatory 20% withholding; recipients cannot elect out of this withholding
The mandatory 20% withholding on lump-sum and other nonperiodic distributions means the participant receives only 80% of the account. The 20% is refunded when the participant files a tax return, but only if the distribution is properly rolled over. To achieve a complete tax-free rollover, the participant must make up the withheld 20% from personal funds; otherwise the 20% is a taxable distribution subject to the 10% premature penalty if the participant is under 59½.
Rollovers & Transfers
Distributions from qualified retirement plans may generally be moved tax-free to another plan or IRA by two methods:
- Direct transfer (trustee-to-trustee): The plan sends assets directly to the IRA or new plan. No withholding. The participant never takes possession of the funds. This is the preferred and most tax-efficient method.
- Rollover: The plan distributes assets to the participant, who deposits them in another plan or IRA within 60 days. Subject to mandatory 20% withholding. Individuals may rollover (as opposed to a direct transfer) assets only once per 12-month period across all IRAs.
For rollover purposes, “qualified plan” includes corporate retirement plans (defined benefit, profit sharing, 401(k), ESOPs), Keogh plans, IRAs, Section 457 governmental deferred compensation plans, and tax-sheltered annuities (403(b) plans).
After-tax voluntary contributions may now be rolled over into another qualified plan (via direct transfer only, not rollover) provided the receiving plan accepts them and maintains separate accounting. They may always be rolled over to a Roth IRA.
Maria has $100,000 in her 401(k) and wants to roll it to an IRA. If she takes a distribution (not a direct transfer), the plan withholds $20,000 (20%). She receives $80,000.
To complete a full $100,000 rollover within 60 days, Maria must deposit $100,000 — meaning she must contribute $20,000 of her own funds to make up the withheld amount. The $20,000 will be refunded when she files her tax return.
If she deposits only the $80,000 she received, the $20,000 withheld is treated as a taxable distribution — plus a 10% premature penalty if she is under 59½.
Loans to Plan Participants
Many 401(k) plans permit employees to borrow against their account balances. Loans are not treated as distributions if they meet the tax code requirements, making them a useful source of emergency funds without triggering immediate taxation. Loans must be available to all participants on a nondiscriminatory basis.
The maximum loan is the lesser of:
- $50,000, or
- 50% of the participant’s vested account balance (minimum $10,000 even if 50% of the vested balance is less)
For participants with multiple plans from the same or commonly-controlled employers, the $50,000 maximum applies across all plans as a group.
Loans must be secured by collateral (typically the vested account balance). Married participants must obtain written spousal consent before pledging the account. Loans must be:
- Repaid within 5 years (no limit for primary residence acquisition loans)
- Amortized at least quarterly (no balloon payments permitted)
- Made at a reasonable rate of interest
If a loan fails to meet these requirements, the entire outstanding amount is treated as a taxable distribution — subject to the 10% premature penalty if the participant is under 59½.
Plans typically require repayment of any outstanding loan upon termination of employment. A participant who cannot repay will have the unpaid balance treated as a taxable distribution. The participant may not use the remaining vested account balance to repay the loan — the two are separate.
Ed (age 33) borrowed $10,000 from his 401(k) to buy a car when his vested balance was $24,000. At age 35 he terminates employment with a $30,000 vested balance, which he rolls over to his new employer’s plan. His outstanding loan balance is $5,000.
Ed must repay the $5,000 loan separately. He may not apply $5,000 from his $30,000 vested balance to repay it. If he fails to repay, the $5,000 is a taxable distribution subject to ordinary income tax and the 10% premature penalty.
Joint and Survivor Annuities
Most qualified plans, including 401(k)s, must provide a Qualified Joint and Survivor Annuity (QJSA) as the automatic form of payout for married participants. The QJSA pays periodic amounts for the joint lives of the participant and spouse; upon the participant’s death, the spouse continues to receive at least 50% of the original payment for life.
A participant may waive the QJSA and elect another distribution form, but the spouse must consent in writing. Written spousal consent is required unless the participant’s vested interest is less than $5,000.
Walter and Barbara Leigh are married. Walter’s vested 401(k) balance at retirement is $225,000. He wishes to take a lump-sum distribution. Because the automatic form of payout is the QJSA, the plan administrator must have Walter sign a written waiver and obtain written consent from Barbara before making the lump-sum distribution.