403(b) vs 401(k): What's the Real Difference?
A 403(b) and a 401(k) share the same 2026 contribution limit of $24,500 ($32,500 if you're 50+, $35,750 if you're 60–63) and nearly identical tax rules, but a 403(b) is only offered by public schools, hospitals, and 501(c)(3) nonprofits, while a 401(k) comes from for-profit (and some nonprofit) employers — and the two differ in ways that matter, from fund menus to an extra catch-up rule only the 403(b) has.
403(b) vs 401(k): Side-by-Side
| 403(b) | 401(k) | |
|---|---|---|
| Who can offer it | Public schools, hospitals, churches, 501(c)(3) nonprofits | For-profit employers (and some nonprofits) |
| 2026 contribution limit | $24,500 ($32,500 if 50+; $35,750 if 60–63) | $24,500 ($32,500 if 50+; $35,750 if 60–63) |
| Extra catch-up option | 15-year rule: up to $3,000/year extra, $15,000 lifetime cap, for 15+ years at a qualifying employer | None beyond the standard age-based catch-ups |
| ERISA protection | Often exempt (church plans, some governmental/nonprofit plans) | Almost always ERISA-covered, with fiduciary oversight |
| Investment menu | Historically annuities and mutual funds only; newer plans can add collective investment trusts | Broad mutual fund and index fund menu, sometimes a brokerage window |
| Typical fees | Can run higher, especially older annuity-based products | Generally lower, especially with index fund options |
| Employer match | Less common, but growing — especially at hospital systems | Very common, typically 3–6% of pay |
Which should you choose?
Contribute enough to capture any employer match either account offers — that's free money regardless of the label. If your 403(b) menu is dominated by high-fee annuity products, look for a 403(b)(7) mutual-fund-only option or ask your employer if one's available; if not, prioritize an outside IRA for extra savings before overfunding a high-fee 403(b).
Teachers, nurses, and other long-tenured nonprofit staff should also check whether they qualify for the 403(b)'s 15-year catch-up — it's a real bonus a 401(k) simply doesn't offer.
The 403(b)'s 15-year catch-up is a unique perk
Employees with at least 15 years of service at a qualifying employer — public schools, hospitals, home health agencies, and certain other nonprofits — can contribute an extra $3,000 per year to a 403(b), up to a $15,000 lifetime cap, under a special rule the IRS calls the 15-year rule.
A 401(k) has no equivalent. If you're 50 or older, you generally use whichever catch-up gives you the bigger number in a given year — the standard age-50 catch-up or the 15-year rule — rather than stacking both to their full amounts. Check with your plan administrator, since eligibility for the 15-year rule depends on your specific years of service and employer type.
Why 403(b) fees have a worse reputation
Many older 403(b) plans, especially at K-12 schools, were built around variable annuity contracts sold by insurance reps, layered with mortality and expense charges, surrender fees, and other costs that a typical 401(k) doesn't carry. That history is the main reason 403(b)s carry a reputation for higher fees.
The fix isn't to avoid the 403(b) — it's to check what's actually inside yours. Many modern 403(b) plans, particularly at hospitals and universities, now offer low-cost mutual fund lineups (sometimes called 403(b)(7) custodial accounts) that look and cost about the same as a good 401(k). Ask your HR department for the plan's fee disclosure and compare the expense ratios directly against a comparable 401(k) fund.
ERISA coverage isn't automatic for a 403(b)
A 401(k) at a for-profit company is almost always covered by ERISA, the federal law that requires fiduciary oversight, nondiscrimination testing, and specific disclosure rules. Church-sponsored 403(b) plans, and many governmental 403(b) plans (public schools), are exempt from ERISA by statute.
That doesn't automatically make a 403(b) unsafe, but it does mean less regulatory oversight of the plan's investment menu and fees. If your 403(b) is ERISA-exempt, take extra care reviewing the specific products offered rather than assuming the same protections apply that would apply to a typical 401(k).
Can you have both, and does it change your limit?
If you work two jobs in the same year — say, a school district 403(b) and a side gig with a 401(k) — the two plans share one combined IRS elective-deferral limit, not two separate ones. Your total contributions across both accounts in 2026 cannot exceed $24,500 ($32,500 if you're 50+), the same rule that applies to switching between a 401(k) and a 403(b) mid-career.
This differs from a 457(b), which has its own separate limit that can be maxed independently in the same year (see 403(b) vs 457(b) for how that account fits into the picture).
Frequently asked questions
Is a 403(b) the same as a 401(k)?
They're structurally similar — both are employer-sponsored, tax-advantaged retirement accounts with the same 2026 contribution limit — but a 403(b) is only offered by public schools, hospitals, churches, and other 501(c)(3) nonprofits, while a 401(k) comes from for-profit employers.
Can I have both a 403(b) and a 401(k)?
Yes, if you have income from two different qualifying employers in the same year, but the two accounts share one combined IRS contribution limit ($24,500 in 2026), not two separate limits.
Does a 403(b) have the same contribution limit as a 401(k)?
Yes. Both share the same 2026 elective deferral limit of $24,500, with an additional $8,000 catch-up at age 50+ ($32,500 total) or $11,250 for ages 60–63 ($35,750 total).
What is the 403(b) 15-year catch-up rule?
Employees with at least 15 years of service at a qualifying employer can contribute an extra $3,000 per year beyond the standard limit, up to a $15,000 lifetime cap. A 401(k) has no equivalent provision.
Are 403(b) plans riskier than 401(k) plans?
Not inherently, but many older 403(b) plans are built around higher-fee annuity products and some are exempt from ERISA's fiduciary oversight. Check your plan's specific fund lineup and fee disclosure rather than assuming it matches a typical 401(k).
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