Yes, you can keep contributing to a 401(k) after retirement, but only if you have earned income from a job or self-employment. The IRS sets no maximum age for participation, so eligibility turns on whether you are working and being paid for that work, not on whether you already retired from an earlier career. For 2026, working retirees age 50 and older can defer up to $32,500 into a 401(k), and those aged 60 through 63 can defer up to $35,750.
Earned Income Is the Gate
A 401(k) contribution has to come out of compensation you receive for work you personally perform. Wages, salaries, tips, and self-employment income qualify. The income sources most retirees live on do not: Social Security benefits, pension payments, annuity distributions, dividends, interest, and capital gains cannot support a 401(k) contribution because none of them is pay for current-year labor.1Office of the Law Revision Counsel. 26 USC 401 – Qualified Pension, Profit-Sharing, and Stock Bonus Plans
Your earned income also caps how much you can defer. You cannot contribute more than 100% of your taxable compensation for the year, even if the federal dollar limits are higher.2Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits A part-time worker earning $10,000 in 2026 is limited to $10,000 in deferrals, regardless of the $24,500 federal base limit. Income you earn as a consultant or freelancer needs to be reported as W-2 wages or self-employment income to count.
Getting Into a New Employer’s Plan
Coming back to work means meeting the new employer’s plan eligibility rules. Federal law lets an employer require up to one year of service before you can start making elective deferrals.3Internal Revenue Service. 401(k) Plan Qualification Requirements Many plans use shorter waits, often 90 days. The Summary Plan Description from human resources will tell you when you become eligible.
Part-time work is more accessible than it used to be. Under SECURE 2.0, for plan years beginning after December 31, 2024, employers must allow participation for workers who complete at least 500 hours of service in each of two consecutive 12-month periods.4Internal Revenue Service. Notice 2024-73 – Additional Guidance for Long-Term Part-Time Employees Roughly 10 hours a week year-round clears the threshold. Once you qualify, the plan has to let you enroll and defer on the same basis as full-time staff.
Watch the Vesting Schedule on the Match
Your own deferrals belong to you from day one. Employer matching contributions do not always. Plans can use a three-year cliff schedule, where you get nothing until three years of service and then become 100% vested, or a graded schedule that phases in ownership over two to six years.4Internal Revenue Service. Notice 2024-73 – Additional Guidance for Long-Term Part-Time Employees If you only plan to work a couple of years in an encore role, you may leave before the match fully vests.
How Much You Can Contribute in 2026
The base employee deferral limit for 2026 is $24,500. That applies to pre-tax or Roth contributions taken from your paycheck. Workers age 50 and older can add an $8,000 catch-up, for a total employee deferral of $32,500.5Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
SECURE 2.0 added a higher catch-up tier for participants aged 60 through 63. Instead of $8,000, this group can contribute up to $11,250 in additional deferrals for 2026, bringing the total employee limit to $35,750.5Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 At 64 you revert to the standard $8,000 catch-up, so the enhanced window is narrow and worth planning around.
Employer contributions ride on top of that. The overall annual additions limit for 2026 is $72,000, rising to $80,000 with the standard catch-up and $83,250 for those aged 60 through 63.2Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits
Mandatory Roth Catch-Up for Higher Earners
Starting January 1, 2026, employees who earned more than $145,000 in FICA wages from their employer in the prior year must make all catch-up contributions on a Roth basis. If you earned $145,000 or less, you can still choose pre-tax or Roth for catch-ups, assuming your plan offers both. This rule was originally set for 2024 and was delayed by two years. If your plan does not offer a Roth option, ask the plan administrator whether catch-up contributions are available to you at all.
Coordinating Deferrals Across Two Plans
The employee deferral limit belongs to you as an individual, not to each plan. If you contribute to two employers’ 401(k) plans in the same year, your combined deferrals cannot exceed $24,500 plus any applicable catch-up.6Internal Revenue Service. Consequences to a Participant Who Makes Excess Annual Salary Deferrals This trips up retirees who start a new job partway through the year after already contributing at the old one.
An excess deferral is included in your taxable income for the year it was contributed. You have until April 15 of the following year to request a corrective distribution. Miss that deadline and the excess is taxed again when you eventually withdraw it, because the IRS does not credit basis for uncorrected excess deferrals.7Internal Revenue Service. Consequences to a Participant Who Makes Excess Deferrals to a 401(k) Plan
Solo 401(k) if You’re Self-Employed
If your post-retirement work is a business or freelance practice, a solo 401(k), also called a one-participant 401(k), may fit. It covers a business owner with no employees other than a spouse.8Internal Revenue Service. One-Participant 401(k) Plans You contribute in two roles. As the employee, you can defer up to $24,500 in 2026, plus catch-up if you are 50 or older. As the employer, you can add a profit-sharing contribution of up to 25% of your net self-employment income.
Combined employee and employer contributions cannot exceed $72,000 for 2026 if you are under 50, with higher ceilings once catch-ups apply.2Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits The dual contribution structure lets a part-time consultant shelter more income than a standard employer plan allows. The employee deferral portion still shares the same annual limit across all your 401(k) plans, so if you also contribute at another employer, the combined employee deferrals cannot exceed $24,500 plus any catch-up.
RMDs Can Wait if You’re Still Working
Under SECURE 2.0, required minimum distributions start at age 73 for people born between 1951 and 1959, and at age 75 for those born in 1960 or later. If you are still working past your RMD age, you can delay distributions from your current employer’s plan until April 1 of the year after you actually retire. This is the still-working exception.9Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs
One boundary matters. The exception does not apply if you own more than 5% of the company sponsoring the plan. Significant owners have to begin RMDs at the applicable age whether they keep working or not.9Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs Everyone else can keep deferring while the account continues to grow untouched.
The exception only shields the plan at your current employer. Old 401(k) accounts from previous jobs must begin distributions by your applicable age. Rolling those old balances into the current plan may bring them under the still-working umbrella, but not every plan accepts incoming rollovers, so check first. Missing an RMD triggers a 25% excise tax on the shortfall, dropping to 10% if you correct it within two years.9Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs
Two Interactions Worth Knowing
If you claim Social Security before your full retirement age and keep working, the earnings test can temporarily reduce your monthly benefit. For 2026, Social Security withholds $1 for every $2 you earn above $24,480 if you will not reach full retirement age during the year. In the year you reach full retirement age, the threshold rises to $65,160 and only $1 is withheld for every $3 earned above it, counting only the months before you reach full retirement age.10Social Security Administration. Exempt Amounts Under the Earnings Test
Social Security counts your gross wages before any pre-tax 401(k) deferrals, so contributing does not lower the income used for the earnings test. Distributions from a 401(k) or other retirement accounts are not earnings for this purpose. Once you reach full retirement age, the earnings test goes away.
Medicare Part B premiums use your modified adjusted gross income from two years prior. Income above certain thresholds triggers the Income-Related Monthly Adjustment Amount, or IRMAA, a surcharge on top of the base premium.11CMS. 2026 Medicare Parts A and B Premiums and Deductibles Because pre-tax 401(k) deferrals reduce your adjusted gross income, they can keep you in a lower IRMAA bracket two years down the line. Roth contributions do not offer that benefit, since they don’t reduce current AGI.