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

Yes, you can have both a 401(k) and a 403(b) in the same year, and there is no IRS rule against contributing to each. The catch is that your personal elective deferrals share a single cap across both plans: $24,500 for 2026. Employer contributions, catch-ups, and a 403(b)-only provision for long-tenured employees can push your total savings well past that number if the rules line up in your favor.

When Dual Participation Actually Happens

Two situations put most people in this spot. You work two jobs at once, one at a private-sector employer with a 401(k) and another at a public school, nonprofit, hospital, or church that offers a 403(b). Or you switch employers partway through the year and move from one plan type to the other. Either way, the IRS lets you participate in both. The complications aren’t about eligibility. They’re about limits, and the limits don’t behave the way people expect.

The Shared Elective Deferral Limit

The rule that matters most: your elective deferrals are capped per person, not per plan. Section 402(g) of the Internal Revenue Code sets that ceiling at $24,500 for 2026.¹ Every dollar you defer into your 401(k) reduces what you can defer into your 403(b), and vice versa.²

Employer matching contributions do not count against the $24,500. Only the money you choose to defer from your paycheck, whether pre-tax or Roth, is subject to the 402(g) limit.³ Generous matches at both jobs won’t shrink your personal deferral room.

Tracking the combined total is entirely on you. Each employer’s payroll system only sees its own plan. If you defer $15,000 into your 401(k) and $12,000 into your 403(b), you’ve gone over by $2,500, and neither HR department will flag it.⁴

Catch-Ups That Raise Your Combined Ceiling

If you turn 50 or older by year-end, you can defer beyond $24,500. The standard 2026 catch-up is $8,000, bringing the combined ceiling to $32,500.⁵ The catch-up applies across both plans combined, and even if one plan doesn’t explicitly allow catch-up contributions, your personal limit still rises by the full $8,000.

The Higher Catch-Up for Ages 60 Through 63

The SECURE 2.0 Act created a larger catch-up tier for participants who are 60, 61, 62, or 63 during the year. For 2026, that enhanced amount is $11,250, pushing the maximum deferral to $35,750.⁵ It applies to both 401(k) and 403(b) plans.⁶ Once you turn 64, you drop back to the $8,000 catch-up. It’s a narrow four-year window that’s easy to miss.

A Roth Catch-Up Rule Coming in 2027

Starting in 2027, catch-up contributions for participants who earned more than $145,000 in FICA-taxable wages from a single employer in the prior year will have to be made on a Roth basis. The requirement does not apply for 2026, but if you’re a high earner, it’s worth understanding before it lands.⁶

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

This one is unique to 403(b) plans. If you’ve worked at least 15 years for the same qualifying employer, which includes public schools, hospitals, home health service agencies, and churches, you can contribute an extra $3,000 per year above the standard deferral limit, up to a $15,000 lifetime cap.⁷⁸

The $3,000 figure is fixed in the statute and doesn’t adjust for inflation. The lifetime cap also runs through a secondary calculation tied to $5,000 times your years of service, minus all prior elective deferrals to that employer’s plans, so the actual amount available in a given year can come in below $3,000 depending on your contribution history.

When you qualify for both the 15-year catch-up and the age-50 catch-up, the 15-year amount applies first, and any remaining catch-up contributions count toward the age-50 limit.⁷ If you’re 55 with 20 years of service and make $10,000 in catch-up contributions, the first $3,000 uses your 15-year allowance and the remaining $7,000 counts against the age-50 limit. Ordering matters because the 15-year catch-up has a lifetime ceiling while the age-50 catch-up resets each year.

The Bigger Ceiling: Total Annual Additions

Each plan also has a separate cap on contributions from all sources. Section 415(c) limits the combined total of your elective deferrals, employer matching, and any other employer contributions to $72,000 per plan for 2026, or 100% of your compensation if that’s lower.¹

If your two employers are unrelated and you have no ownership stake in either, the $72,000 ceiling applies separately to each plan. That leaves room for up to $144,000 in total annual additions across the two, even though your own elective deferrals still can’t exceed $24,500 combined plus any catch-up. The extra room comes entirely from employer contributions.⁹

When You Have to Combine the 415(c) Limits

That separate-limit advantage disappears if the employers form a controlled group. For Section 415 purposes, the ownership threshold is more than 50%, not the 80% figure used elsewhere in the tax code. If you own a majority stake in a business with a 401(k) and also participate in a 403(b) at a nonprofit where you’re employed, the IRS treats both plans as maintained by a single employer, and your combined total additions can’t exceed $72,000.⁹

This trips up business owners more than anyone else. A physician who runs a private practice with a solo 401(k) and also works part-time at a nonprofit hospital with a 403(b) needs to check the controlled group rules before assuming there are two separate $72,000 buckets.

The 457(b) Side Door for Governmental Employees

If your 403(b) employer is a government entity like a public school district or state university, there’s a good chance you also have access to a 457(b) deferred compensation plan. The 457(b) carries its own deferral limit that does not aggregate with your 401(k)/403(b) contributions. For 2026, the 457(b) cap is also $24,500, but it stands separately.¹⁰

Fixing an Excess Deferral

If you contribute more than $24,500 in combined elective deferrals, you need to pull the excess out before April 15 of the following year. For a 2026 excess, the deadline is April 15, 2027. You tell one or both plan administrators about the overage and they distribute the excess plus any attributable earnings.¹¹

Meet the deadline and the excess comes out without penalty. The earnings portion is taxable in the year distributed, but the excess itself avoids double taxation. Miss the deadline and things get worse:

The excess is taxed in the year you contributed it and again when you eventually withdraw it from the plan.
A late corrective distribution can trigger the Section 72(t) 10% additional tax unless you meet an exception like being over 59½.
The employer’s plan itself can face disqualification risk, requiring correction through the IRS’s Employee Plans Compliance Resolution System.

¹²

Practical Steps to Stay Inside the Limits

The biggest risk with dual-plan participation isn’t picking the wrong fund. It’s blowing past a limit you didn’t know applied to you. A few habits prevent that:

Set both plans’ deferral elections with the combined limit in mind at the start of the year. If you contribute $18,000 to your 401(k), cap your 403(b) elective deferrals at $6,500.
Watch mid-year job changes carefully. A new employer’s payroll system starts from zero, so tell them how much you already deferred at the old job.
Keep your final pay stubs and W-2s from every employer. Box 12 shows retirement plan deferrals (Code D for 401(k), Code E for 403(b)). Comparing these across employers is the fastest way to spot an excess before you file.
Act quickly if you find an overage. The April 15 correction deadline doesn’t move, so contact the plan administrator as soon as you notice the problem.

Between the 15-year catch-up, the age-based catch-up tiers, and the standard deferral limit across two employers, a single spreadsheet error can create a tax problem that takes months to unwind. Getting the contribution elections right at the beginning of the year is always cheaper than correcting an excess after the fact.

1
Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Changes in Cost-of-Living
2
Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits
3
Office of the Law Revision Counsel. 26 USC 402 – Taxability of Beneficiary of Employees Trust
4
Internal Revenue Service. How Much Salary Can You Defer if Youre Eligible for More Than One Retirement Plan
5
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
6
Internal Revenue Service. Treasury, IRS Issue Final Regulations on New Roth Catch-Up Rule, Other SECURE 2.0 Act Provisions
7
Internal Revenue Service. 403(b) Plans – Catch-Up Contributions
8
Office of the Law Revision Counsel. 26 USC 403 – Taxation of Employee Annuities
9
Office of the Law Revision Counsel. 26 USC 415 – Limitations on Benefits and Contribution Under Qualified Plans
10
Internal Revenue Service. Consequences to a Participant Who Makes Excess Deferrals to a 401(k) Plan
12
Internal Revenue Service. 401(k) Plan Fix-It Guide – Elective Deferrals Werent Limited to the Amounts Under IRC Section 402(g)