403b vs 401k plans are nearly identical salary-deferral accounts that share the same 2026 employee deferral limit of $24,500 but differ mainly by employer type.
Key Takeaways
- For 2026, both plans share the same $24,500 employee elective deferral limit, up from $23,500 in 2025, plus an $8,000 age-50 catch-up.
- Employees ages 60 through 63 can contribute an enhanced catch-up of $11,250 under SECURE 2.0.
- A 403(b) may only be offered by public schools, 501(c)(3) nonprofits, and churches; a 401(k) serves private for-profit employers.
- A 403(b) can hold only annuity contracts and mutual fund custodial accounts, while a 401(k) commonly adds ETFs and a brokerage window.
- Only a 403(b) offers the 15-year service catch-up, up to $3,000 per year and $15,000 lifetime, requiring 15 years with the same qualifying employer.
- The 2026 overall annual additions limit under section 415(c) is $72,000, up from $70,000 in 2025.
- A single shared $24,500 deferral limit applies across a 403(b) and a 401(k) held in the same year, and withdrawals before age 59.5 generally face a 10% penalty.
2026 403(b) and 401(k) Limits
Figures reflect 2026 IRS limits cited in this article.
The core of 403b vs 401k is this: they are nearly identical salary-deferral retirement plans that differ mainly by who your employer is, what you can invest in, and a few catch-up rules. A 401(k) is offered by private for-profit employers; a 403(b) only by public schools, churches, and 501(c)(3) nonprofits. For 2026, both share the same $24,500 employee limit. Savers who change employers often ask whether they can roll a 403b into a 401k.
A 401(k) and a 403(b) work almost the same way. Both let you defer up to $24,500 of salary in 2026 (Source: IRS Notice 2025-67), with the same $8,000 age-50 catch-up. The differences are the eligible employer, the investment menu (403(b) is limited to annuities and mutual fund custodial accounts), and a 403(b)-only 15-year catch-up. Most people do not choose; your employer type decides.
403b vs 401k: the short version
A 401(k) and a 403(b) are both employer-sponsored plans that let employees defer salary into a tax-advantaged account. For 2026 they share the same $24,500 elective deferral limit and $8,000 age-50 catch-up (Source: IRS Notice 2025-67). The practical differences are employer eligibility, allowed investments, and a handful of 403(b)-specific rules. Each is named for the Internal Revenue Code section that authorizes it.
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Who can offer each plan?
Employer type is the primary difference between a 403(b) and a 401(k). A 403(b) may only be established by public schools and colleges, 501(c)(3) tax-exempt organizations, and churches (Source: IRS, IRC 403(b) plans). A 401(k) serves private for-profit employers. State and local governments generally cannot adopt a new 401(k) after May 6, 1986 (Source: IRC 401(k)(4)(B)), which is why public school staff usually see a 403(b).
| Feature | 401(k) | 403(b) |
|---|---|---|
| Typical employer | Private for-profit employers (not state/local governments) | Public schools, 501(c)(3) nonprofits, churches, cooperative hospitals |
| 2026 elective deferral limit | $24,500 | $24,500 |
| Age-50 catch-up (2026) | $8,000 | $8,000 |
| Ages 60 to 63 catch-up (2026) | $11,250 | $11,250 |
| Special 15-year catch-up | None | Up to $3,000/yr, $15,000 lifetime |
| Investments allowed | Broad: mutual funds, ETFs, brokerage window | Limited: annuities and mutual fund custodial accounts |
| ERISA coverage | Always (private employers) | Varies; many government and church plans exempt |
What are the 2025 and 2026 contribution limits?
For 2026, the employee elective deferral limit for both 401(k) and 403(b) plans is $24,500, up from $23,500 in 2025 (Source: IRS Notice 2025-67). The age-50 catch-up is $8,000. Under SECURE 2.0, employees ages 60 through 63 may contribute $11,250 instead. The overall annual additions limit under section 415(c), counting employee plus employer contributions, is $72,000 for 2026 (Source: IRS Pub 571, Rev. Jan 2026).
| Limit (applies to both plans) | 2025 | 2026 |
|---|---|---|
| Employee elective deferral (402(g)) | $23,500 | $24,500 |
| Age-50 catch-up (414(v)) | $7,500 | $8,000 |
| Ages 60 to 63 enhanced catch-up | $11,250 | $11,250 |
| Overall annual additions (415(c)) | $70,000 | $72,000 |
How are they taxed: traditional vs Roth?
Both plans offer the same two tax structures. Traditional contributions go in pre-tax and are taxed as ordinary income at withdrawal; Roth contributions go in after-tax, and qualified withdrawals are tax-free (Source: IRS Pub 571). Whether your plan offers a Roth option is set by the plan document. Because large pre-tax balances raise future required distributions, some households model a Roth conversion in lower-income years and study how much to convert to Roth each year.
What are the investment options, and the annuity-fee problem?
Investment choice is where a 403(b) and a 401(k) genuinely diverge. A 403(b) may be funded through only two vehicles: annuity contracts issued by an insurance company and custodial accounts holding mutual funds (Source: IRS, IRC 403(b) plans). A 401(k) has no such restriction and commonly offers mutual funds, ETFs, and sometimes a brokerage window. Annuities, common in K-12 plans, can carry surrender charges and mortality-and-expense fees, so compare options with a checklist:
- Ask each vendor for the total expense ratio of every fund or subaccount, in writing.
- Confirm whether the product is an annuity or a mutual fund custodial account (a 403(b)(7) account).
- Ask the surrender charge amount and how many years until it disappears.
- Ask about mortality and expense (M&E) or administrative fees added on top of fund costs.
- Compare the lowest-cost mutual fund vendor against the annuity options.
Employer match, vesting, and fees
Employer matching is common in 401(k) plans and less common in 403(b) plans, though many nonprofits and hospitals do match. Contributing enough to capture the full match is a widely discussed baseline, because an unmatched dollar is money left behind. Vesting also differs: some 403(b) plans use shorter or immediate vesting, while 401(k) vesting varies by employer. Your plan document sets the match formula and vesting schedule.
ERISA, testing, and reporting
A 401(k) maintained by a private employer is always subject to ERISA Title I, which brings fiduciary duties, nondiscrimination testing, and Form 5500 reporting (Source: DOL/EBSA; IRC 410(d)). A 403(b) may or may not be covered. Governmental 403(b) plans, such as public schools, are exempt, and a private nonprofit 403(b) can avoid ERISA under the Department of Labor safe harbor at 29 CFR 2510.3-2(f). Lighter ERISA status can lower cost but reduces fiduciary protection. For larger plans, those ERISA reporting duties can also bring 401(k) audit requirements.
How does the 403(b) 15-year catch-up actually work?
The 403(b) has one catch-up the 401(k) does not: a special 15-year service catch-up. It permits an extra elective deferral equal to the least of $3,000; $15,000 minus special catch-ups already used; or $5,000 times years of service minus all prior deferrals to the employer’s plans (Source: IRS, 403(b) catch-up contributions; Pub 571). The lifetime cap is $15,000, and you need 15 years with the same qualifying organization.
A worked example shows how the least-of-three test bites. A teacher with 16 years of service who has made $210,000 of career deferrals runs the three amounts: $3,000; $15,000; and $5,000 times 16 ($80,000) minus $210,000, which is negative. The least figure controls, so she gets $0 this year because her cumulative deferrals already exceed the $5,000-per-year threshold. The rule most helps long-tenured employees who contributed modestly in earlier years.
Withdrawals, penalties, RMDs, and loans
Withdrawal rules are largely the same for both plans. Distributions before age 59.5 are generally subject to a 10% early withdrawal penalty plus ordinary income tax, with exceptions such as the rule of 55 (Source: IRS). Required minimum distributions generally begin at age 73, rising to age 75 for those born in 1960 or later. Both plans may permit loans if the document allows. See the Q3 guide to required minimum distributions for 2026.
How to decide when you actually have a choice
Most employees do not pick between a 401(k) and a 403(b); the employer sets the plan type. But several real situations do call for a decision, and each has a straightforward way to think it through. The three cases below cover having access to both plans in the same year, facing a 403(b) that offers only expensive annuities, and changing jobs between the nonprofit and for-profit sectors.
You have access to both plans in the same year
You can contribute to both a 401(k) and a 403(b) in the same year, but a single shared elective deferral limit of $24,500 for 2026 applies across them combined, not per plan (Source: IRS, deferring in more than one plan; Notice 2025-67). One approach is to direct deferrals to whichever plan has the lower fees and any available match.
Your 403(b) only offers expensive annuities
If your only 403(b) options are high-cost annuities, the rules let you contribute up to any match, then consider an IRA for additional savings, since an IRA can hold low-cost funds. The 2026 IRA limit is separate at $7,500, or $8,600 if you are 50 or older (Source: IRS Newsroom, 2026 limits). Whether this fits depends on your income and IRA deduction or Roth eligibility.
You are switching between a nonprofit and a for-profit job
When you change employers, a 403(b) balance can generally be rolled into a new employer’s 401(k) if it accepts rollovers, or into an IRA, preserving tax deferral. These moves often intersect with broader tax planning, including the net investment income tax. A financial professional can model the specific numbers for your situation.
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Frequently asked questions
Is a 403(b) better than a 401(k)?
Neither is universally better; a 403(b) and a 401(k) share the same 2026 contribution limits and tax treatment (Source: IRS Notice 2025-67). A 401(k) usually offers a broader investment menu, while a 403(b) is limited to annuities and mutual fund custodial accounts and may have shorter vesting. Which serves you better depends on your specific plan’s fees, match, and investment quality, not the plan type alone.
What are the disadvantages of a 403(b)?
The main drawbacks of a 403(b) are a narrower investment menu, limited by law to annuity contracts and mutual fund custodial accounts (Source: IRS, IRC 403(b) plans), and the potential for high costs in some annuity products, including surrender charges. Employer matching is less common than in 401(k) plans. Fee levels vary widely by vendor, so reading each option’s disclosure is the reliable check.
Can I have a 403(b) and a 401(k) at the same time?
Yes, if you have access to both. However, a single shared employee deferral limit of $24,500 for 2026 applies across a 403(b) and a 401(k) combined, not separately (Source: IRS, deferring in more than one plan; Notice 2025-67). Employer contributions are counted separately under the $72,000 annual additions limit, which applies per employer.
What happens to a 403(b) when you quit?
When you leave, your vested 403(b) balance remains yours. You can generally leave it in the plan, roll it into a new employer’s 401(k) or 403(b) if that plan accepts rollovers, or roll it into an IRA, all preserving tax deferral (Source: IRS rollover rules). Cashing out before age 59.5 can trigger a 10% early withdrawal penalty plus income tax, with exceptions. A rollover can also go straight to a Roth, explained in how a 403(b) to Roth IRA conversion works. Access before leaving follows different rules, covered in 403(b) withdrawals while still employed.
At what age is a 403(b) withdrawal tax-free?
Traditional 403(b) withdrawals are never fully tax-free; they are taxed as ordinary income, though the 10% early withdrawal penalty generally ends at age 59.5 (Source: IRS). Roth 403(b) withdrawals can be tax-free if the account has been held at least five years and you are at least 59.5, disabled, or deceased. Pre-tax and Roth balances follow different rules.
