The Core Difference in One Sentence
A 401(k) is available at for-profit companies; a 403(b) is available at nonprofits, public schools, and certain tax-exempt organizations. Both accounts let you save for retirement with pre-tax or Roth contributions, but they differ in investment options, employer match rules, and a few other details that matter depending on your situation.
Who Has Access to Each Plan?
401(k) plans are offered by private, for-profit employers. Any business — from a Fortune 500 company to a small startup — can offer a 401(k) to its employees.
403(b) plans, also called Tax-Sheltered Annuity (TSA) plans, are available to employees of:
- Public schools and universities (K–12 and higher education)
- Hospitals and healthcare organizations
- Nonprofit organizations with 501(c)(3) status
- Church organizations
- Certain government employers
If you work for a school district, university, hospital system, or nonprofit, you likely have a 403(b). Teachers and healthcare workers are among the most common 403(b) participants.
2026 Contribution Limits: Nearly Identical
The contribution limits for 401(k) and 403(b) plans are the same:
- Employee contribution limit: $23,500 per year
- Catch-up contribution (age 50+): Additional $7,500, bringing the total to $31,000
- Super catch-up (ages 60–63): Starting in 2025 under SECURE 2.0 rules, eligible participants in this age range can contribute an additional $11,250 beyond the standard limit
If you have both a 401(k) and a 403(b) — for example, because you changed jobs mid-year or hold two jobs — the combined employee contribution limit still applies across both accounts.
Investment Options: The Key Practical Difference
This is where the two plans diverge most in day-to-day experience.
401(k) plans typically offer a menu of mutual funds, index funds, and target-date funds. The quality varies considerably by employer — some 401(k)s offer excellent low-cost index funds, while others are dominated by high-expense-ratio actively managed funds. The trend in recent years has been toward better, lower-cost options.
403(b) plans have historically been dominated by annuity products from insurance companies. This has been a notable disadvantage — annuities often carry higher fees, surrender charges, and less flexibility than mutual funds. In recent years, more 403(b) plans have expanded to include mutual fund options, but many plans — particularly older school district plans — still lead with annuity-based products.
If you have a 403(b), check whether your plan includes mutual fund options (often called custodial accounts within the plan) and compare their expense ratios. If your only options are annuity products with high fees, it may be worth contributing up to the employer match and directing additional retirement savings to a Roth IRA instead.
The 15-Year Catch-Up Provision
403(b) plans offer an additional catch-up contribution option not available in 401(k) plans: the 15-year catch-up. Employees of eligible organizations who have worked for the same employer for at least 15 years and have contributed less than a specified average in prior years may be able to contribute an additional $3,000 per year, up to a lifetime limit of $15,000.
This provision is rarely advertised and the calculation is complex. If you have spent a long career at a nonprofit or school and are approaching retirement, it is worth checking with your plan administrator to see if you qualify.
Employer Match
Both 401(k) and 403(b) plans allow employer matching contributions. However, 403(b) plans — particularly in public education and certain nonprofits — are less likely to offer a match than 401(k) plans at private-sector employers. Many school districts and hospitals do not match 403(b) contributions at all, instead offering a defined-benefit pension as the primary retirement benefit.
If your employer does offer a 403(b) match, contribute at least enough to capture it fully. That is an immediate 50% to 100% return on that portion of your contribution.
Vesting Schedules
Employer contributions (matching funds) in 401(k) plans are often subject to a vesting schedule, meaning you must work at the company for a certain number of years before you fully own those employer dollars. 403(b) plans can also have vesting schedules, though governmental 403(b) plans are sometimes immediately vested.
Know your vesting schedule before you leave an employer — particularly if you are close to a cliff or graded vesting milestone.
Loans and Hardship Withdrawals
Both plan types allow loans and hardship withdrawals under IRS rules, though the specific terms depend on how the plan is structured by your employer. Early withdrawals (before age 59.5) are subject to a 10% penalty plus ordinary income tax in both account types, with limited exceptions.
Which Is Better?
Neither is inherently better. The quality of either plan depends almost entirely on the investment options offered by your specific employer’s plan. A well-structured 403(b) with low-cost index fund options is an excellent retirement vehicle. A 401(k) with high-fee funds and no match is not necessarily better than a 403(b) in the same situation.
The framework for both accounts is the same:
- Contribute at least enough to capture the full employer match (if one exists)
- If the plan has high fees and limited options, consider maxing out a Roth IRA first, then returning to the employer plan
- If the plan has good low-cost options, maximize your contributions up to the annual limit
Bottom Line
If you work for a private employer, you likely have a 401(k). If you work for a school, hospital, or nonprofit, you likely have a 403(b). The contribution limits, tax treatment, and core mechanics are nearly identical. The biggest real-world difference is that 403(b) plans have historically had worse investment options — more annuity products and higher fees — though this is improving. Regardless of which plan type you have, the most important step is to actually use it, capture any available employer match, and choose the lowest-cost investment options available.