403(b) vs. 401(k): What's the Difference?

Not everyone with an employer-sponsored retirement plan has a 401(k). Employees of public schools, universities, hospitals, and many nonprofit organizations are more commonly offered a 403(b) instead — a close cousin with a few meaningful differences.

The core similarities

A 403(b) works a lot like a 401(k) in the ways that matter most day to day:

• Contributions are typically made through payroll deduction, often before tax (Traditional) or after tax with tax-free qualified withdrawals (Roth), mirroring the Traditional vs. Roth 401(k) choice.
• Annual contribution limits are generally aligned with 401(k) limits, adjusted periodically.
• Many employers offer a matching contribution, functioning the same way a 401(k) match does.
• The same catch-up contribution provisions generally apply for those 50 and older.

Where they differ

Who offers them. 401(k)s are offered by private-sector, for-profit employers. 403(b)s are offered by public schools, certain nonprofits, and some government-adjacent organizations.

Investment options. Historically, 403(b) plans were often limited primarily to annuity contracts, though many modern plans now also offer mutual fund options similar to a typical 401(k) menu. Investment choices can still be more limited or come with different fee structures than a comparable 401(k), so it’s worth reviewing what’s actually available in your specific plan.

An additional catch-up provision. Some 403(b) plans offer a special additional catch-up contribution for employees with 15+ years of service at a qualifying organization, on top of the standard age-50 catch-up — a provision that doesn’t have a direct equivalent in most 401(k) plans.

Fee structures. Because many 403(b) plans have historically included annuity-based options, fee structures can sometimes be more complex or higher than a typical low-cost 401(k) index fund lineup — worth checking carefully, using the same due diligence covered in our guide on choosing 401(k) investments.

What about a 457(b)?

A 457(b) is another employer-sponsored plan, common among state and local government employees, with its own separate contribution limit — notably, some employees have access to both a 403(b)/401(k) and a 457(b), potentially allowing contributions to both plans in the same year, which can meaningfully increase total tax-advantaged savings capacity for those who can afford it.

What to do if you have a 403(b)

The same core principles that apply to a 401(k) generally apply here:

1. Contribute enough to get any available employer match.
2. Review the actual investment options and their fees — don’t assume they’re automatically comparable to a typical low-cost 401(k) lineup.
3. Consider whether Traditional or Roth contributions (or a mix) make sense for your tax situation.
4. If you’re 50+ or have long service at a qualifying employer, check whether additional catch-up provisions apply to you specifically.

The bottom line

A 403(b) and a 401(k) serve the same basic purpose — tax-advantaged retirement savings through your employer — and share most of the same core mechanics. The differences that matter most are who’s eligible, what investment options are actually available, and a couple of catch-up provisions unique to 403(b) plans.

This article is for educational purposes only and isn’t personalized financial or tax advice — plan features vary, so check your specific plan documents. See our full disclaimer.