401(k) vs 403(b): Key Differences for Retirement Savers
A 401(k) is offered by for-profit employers. A 403(b) is offered by nonprofits, schools, and government organizations. Both allow pre-tax or Roth contributions with the same annual limits, but they differ in investment options, vesting schedules, and administrative rules. Your employer type determines which plan you get — but either one is a strong retirement savings vehicle.
401(k) vs 403(b) Comparison
| Factor | 401(k) | 403(b) |
|---|---|---|
| Employer Type | For-profit companies | Nonprofits, schools, churches, government |
| 2025 Contribution Limit | $23,500 ($31,000 if 50+) | $23,500 ($31,000 if 50+) |
| Investment Options | Mutual funds, ETFs, company stock, target-date funds | Often limited to annuities and a smaller mutual fund menu |
| Employer Match | Common; varies by company | Less common but available in some plans |
| Roth Option | Available in most plans | Available in most plans |
| Vesting | Graded or cliff vesting for employer match | Often immediate vesting for employer contributions |
| Loan Provisions | Allowed in most plans | Allowed in most plans |
| 15-Year Catch-Up Rule | Not available | Extra $3,000/year for 15+ years of service |
| ERISA Protection | Yes — full ERISA coverage | Not always; church and some government plans may be exempt |
| RMDs | Required at age 73 | Required at age 73 |
How the 401(k) Works
The 401(k) is the most common employer-sponsored retirement plan in the private sector. Employees choose a contribution percentage from each paycheck, and many employers match a portion of that — often 50% of contributions up to 6% of salary. Investments typically include a wide menu of mutual funds, ETFs, target-date funds, and sometimes company stock.
The 401(k) falls under ERISA regulations, meaning plan fiduciaries must act in participants’ best interest. This provides legal protections around fees, disclosures, and investment quality. Vesting for employer match varies — some companies use cliff vesting (fully vested after 3 years) or graded vesting (over 6 years).
How the 403(b) Works
The 403(b) serves employees of tax-exempt organizations: public schools, universities, hospitals, churches, and certain government entities. Contribution limits mirror the 401(k), but 403(b) plans historically leaned toward annuity contracts from insurance companies, which can carry higher fees than mutual fund options.
Modern 403(b) plans increasingly offer mutual fund options alongside annuities, narrowing the gap with 401(k) plans. One unique perk: employees with 15+ years at the same employer may qualify for an additional $3,000/year catch-up contribution on top of the standard age-50 catch-up. Not all plans offer this, but it’s a meaningful benefit for long-tenure nonprofit workers.
Which Plan Is Better?
Neither plan is inherently better — your employer type dictates which one you get. The key differences that affect your outcome are investment quality and fees. Many older 403(b) plans locked participants into expensive annuity contracts with surrender charges. If your 403(b) offers low-cost index funds, it functions nearly identically to a good 401(k).
If you’re choosing between employers, compare the plan’s investment menu, expense ratios, and match formula rather than focusing on the plan type itself. A 403(b) with a 6% match and Vanguard funds beats a 401(k) with no match and expensive actively managed funds every time. See our 401(k) vs IRA comparison for strategies to supplement either plan.
If your 403(b) only offers annuity products with high fees, contribute just enough to capture the full employer match, then direct additional savings to a Roth IRA or Traditional IRA. Also check the Roth 401(k) vs Roth IRA comparison to decide where your Roth contributions go.
Key Takeaways
- 401(k) and 403(b) share the same contribution limits — $23,500 in 2025 ($31,000 if age 50+).
- 401(k) is for private-sector employees; 403(b) is for nonprofits, schools, and government workers.
- 403(b) plans may offer a special 15-year catch-up contribution of $3,000/year for long-tenure employees.
- Investment quality varies more within plan types than between them — always check the fund menu and fees.
- Both offer Roth options and required minimum distributions starting at age 73.
Frequently Asked Questions
Can I contribute to both a 401(k) and a 403(b)?
Yes, if you work for two employers — one offering each plan. However, the total employee contribution limit across both plans is $23,500 combined in 2025. Employer matches don’t count toward this limit.
Do 403(b) plans have employer matching?
Some do, but matching is less common in 403(b) plans than in 401(k) plans. When available, the match structure varies — some nonprofits offer dollar-for-dollar matches, while others provide fixed contributions regardless of employee deferrals.
What is the 403(b) 15-year catch-up rule?
Employees with 15+ years of service at the same nonprofit employer may contribute an extra $3,000 per year, up to a lifetime maximum of $15,000, on top of the regular and age-50 catch-up limits. Not all plans adopt this provision.
Are 403(b) fees typically higher than 401(k) fees?
Historically, yes. Many 403(b) plans used annuity-based products with surrender charges and higher expense ratios. Modern 403(b) plans increasingly offer low-cost mutual fund options, but it’s still important to review your plan’s fee structure carefully.
What happens to my 403(b) if I switch to a private-sector job?
You can roll your 403(b) into a 401(k) at your new employer, a Traditional IRA, or a Roth IRA (with taxes on the conversion). Rolling into an IRA often provides more investment flexibility and potentially lower fees.