Can You Have a 403(b) and a 401(k)? Combined Limits and Catch-Ups

Yes, you can have both a 403(b) and a 401(k) in the same year, as long as each account comes from a separate qualifying employer. What you cannot do is treat them as two independent buckets: for 2026, the salary you defer into both plans combined is capped at $24,500 if you’re under 50, and that ceiling belongs to you as a person, not to each plan.¹

When You Qualify for Both Plans

The plan your employer offers is set by the organization’s tax status, not by your preference. Private for-profit companies sponsor 401(k) plans. Nonprofits, public schools, hospitals, and religious organizations sponsor 403(b) plans. You don’t get to pick between them at a single employer. If you work for two legally unrelated employers with different tax statuses, though, you end up eligible for both.

The common setups look like this: a full-time job at a university or hospital with a 403(b) plus part-time work at a private company with a 401(k); a primary nonprofit job alongside self-employment income routed into a solo 401(k); or two W-2 jobs at unrelated organizations of different tax status. The requirement in every case is that the employers are separate entities paying you separately.

If your only employer offers a 403(b), you can’t open a 401(k) on your own to sit alongside it. Eligibility follows the paycheck.

The Combined 2026 Salary Deferral Limit

Federal law pools your elective deferrals across all employer retirement plans and caps the total.² For 2026, the limit is $24,500 if you’re under age 50.¹

Putting $24,500 into your 403(b) and another $24,500 into your 401(k) puts you $24,500 over. To max out legally, split the $24,500 between the plans intentionally: $15,000 into one and $9,500 into the other, or any other split that totals $24,500 or less.

Your employers don’t share payroll data, so neither plan administrator can see what the other is receiving. Staying under the combined limit is entirely your responsibility. This is where most problems start. People set up deferrals at two jobs independently and don’t realize the totals are linked until tax time.

Catch-Up Contributions if You’re Older

Three different catch-ups can raise your combined limit, each with its own eligibility.

Age 50 and Up

If you turn 50 or older during the calendar year, you can add $8,000 on top of the $24,500 base for 2026.¹ The catch-up applies across both plans, but it’s still one allowance per person. Having two plans doesn’t double it.

Ages 60 Through 63

Under SECURE 2.0, participants who are 60, 61, 62, or 63 during the tax year get a higher catch-up. For 2026, that amount is $11,250, replacing the standard $8,000 for this age group.¹ A 61-year-old participating in both plans could defer up to $35,750 total. Once you turn 64, you drop back to the $8,000 standard catch-up.

The 403(b) 15-Year Service Catch-Up

This one only exists in 403(b) plans. If you’ve worked at least 15 years for the same qualifying employer (a public school, hospital, church, or similar organization), you may be able to contribute up to an extra $3,000 per year, capped at $15,000 over your lifetime.³ The exact amount comes out of a formula that looks at your service years and prior deferrals.

Two catches. First, the 15-year catch-up only works if your plan document explicitly includes it; not all 403(b) plans do. Second, when you’re eligible for both the 15-year and age-based catch-ups, the 15-year portion is applied first, and any remaining room counts toward the age catch-up.⁴

A 52-year-old teacher with 20 years at the same school district could potentially defer $24,500 (base) plus $3,000 (15-year) plus $8,000 (age 50), reaching $35,500. The 15-year piece only goes into the 403(b). If that same teacher also contributes to a 401(k) through a side job, the $24,500 base is still shared across both plans.

The Total Annual Additions Cap

The salary deferral limit covers only what comes out of your paycheck. A separate, larger cap limits everything going into each plan combined: your deferrals plus employer matching and any other employer contributions. For 2026, that cap is $72,000 per plan, or 100% of your compensation, whichever is less.⁵

When your two plans are through unrelated employers, the $72,000 cap applies separately to each plan. In theory, you could receive up to $72,000 in total additions to your 403(b) and another $72,000 to your 401(k), as long as your salary deferrals across both stay within the combined $24,500.⁶

The Control Rule for Business Owners

The math changes if you own the business sponsoring your 401(k). When you have more than 50% control of a business and also participate in a 403(b) from another employer, the IRS treats your 403(b) annuity contract as something you personally control. That triggers aggregation: your 403(b) and your solo 401(k) share a single $72,000 annual additions cap, as if they were one plan.⁷ Both plans must satisfy the $72,000 limit individually and on an aggregate basis.⁶

If you own a consulting LLC and also work for a nonprofit hospital, coordinate the total employer and employee contributions across both plans carefully.

Fixing Excess Deferrals

If you contribute more than $24,500 in salary deferrals across both plans, you need to pull the excess out on a schedule.

By March 1 of the year after the excess, notify one or both plan administrators about how much to allocate for correction to each plan. By April 15, the plan distributes the excess amount plus any earnings on it.² When you get the money back on time, the excess deferral is taxable in the year you originally contributed it, and earnings on that excess are taxable in the year distributed. No early withdrawal penalty applies to a timely corrective distribution.⁸

Miss April 15 and the consequences escalate. The excess is taxed in the contribution year and taxed again when eventually withdrawn.⁹ Late distributions can also trigger the 10% early withdrawal penalty, mandatory 20% withholding, and spousal consent requirements that timely corrections avoid.⁸ The affected plans also risk disqualification, which forces the employer through a formal IRS correction program.

Keep your salary deferral agreements from every employer. The IRS generally requires you to retain tax-supporting documents for at least three years from the filing date.¹⁰

Habits That Keep Dual Participants Out of Trouble

People who hold both plans tend to run into problems not because the rules are impossibly complex, but because the information lives in two systems that never talk to each other. A few practices help.

Decide how to split the $24,500 limit between your two plans before payroll begins each year. Mid-year changes are possible but create confusion.
Add up year-to-date deferrals across both plans monthly using your pay stubs or plan portals. If you’re approaching $24,500 by October, reduce or stop deferrals at one employer.
Confirm 15-year 403(b) catch-up eligibility with your plan document, not just with HR. The provision only exists if the plan includes it.
Check your employer’s match formula. Some employers match only up to a percentage of salary per pay period, and front-loading contributions early in the year can cause you to miss later matches. This is a plan design issue worth confirming with HR.

1
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
2
Office of the Law Revision Counsel. 26 USC 402 – Taxability of Beneficiary of Employees Trust
3
Internal Revenue Service. 403(b) Plans – Catch-Up Contributions
4
Internal Revenue Service. 403(b) Plan Fix-It Guide – An Employee Making a 15-Years of Service Catch-Up Contribution Doesnt Have the Required 15 Years of Full-Time Service With the Same Employer
5
Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Cost-of-Living
6
Internal Revenue Service. Application of IRC Section 415(c) When a 403(b) Plan Is Aggregated With a Section 401(a) Defined Contribution Plan
7
Internal Revenue Service. Publication 571 (01/2026), Tax-Sheltered Annuity Plans (403(b) Plans)
8
Internal Revenue Service. 401(k) Plan Fix-It Guide – Elective Deferrals Werent Limited to the Amounts Under IRC Section 402(g) for the Calendar Year and Excesses Werent Distributed
9
Internal Revenue Service. What Happens When an Employee Has Elective Deferrals in Excess of the Limits
10
Internal Revenue Service. Topic No. 305, Recordkeeping