401(k) vs 403(b)

What Is the Difference Between a 401(k) and a 403(b)?

A 401(k) and a 403(b) are both employer-sponsored, tax-advantaged retirement accounts, but they're built for different types of employers. The core mechanics, payroll deferrals, tax-deferred growth, and annual IRS limits, are nearly identical.

The real difference is eligibility. Similar to how a 401(a) retirement plan is common among government and nonprofit employers, a 403(b) is restricted by the type of organization offering it.

Who Can Offer a 401(k) vs. a 403(b)?

A 401(k) is available to any employer, though it's most commonly associated with for-profit companies. A 403(b) can only be sponsored by public schools, 501(c)(3) tax-exempt organizations, and certain religious institutions.

A 403(b) plan is often the default retirement vehicle for teachers, hospital staff, and nonprofit employees who wouldn't otherwise have access to a 401(k) through their employer.

How Do Contribution Limits and Tax Treatment Compare?

Both plans share the same annual IRS employee contribution limit and the same age-50 catch-up allowance. Contributions to either plan reduce taxable income the same way, and both offer Roth options in many cases.

One notable difference: a 403(b) allows an additional 15-years-of-service catch-up contribution that a 401(k) does not, layered on top of the standard limits detailed for comparable plans like the 401(a) contribution limits.

How Do Investment Options and Compliance Differ?

Investment menus and regulatory oversight are where the two plans diverge most in practice.

Because 403(b) plans can fall outside standard ERISA protections, HR teams managing them need to stay especially close to HR compliance requirements around fiduciary duties and plan documentation.

How Does Employer Matching Compare?

Employer matching is far more common in 401(k) plans than in 403(b) plans, largely a function of the nonprofit budgets behind most 403(b) sponsors. Forbes notes that when a 403(b) does offer a match, contributing enough to capture it is still worth doing even if the rest of the plan's investment lineup is mediocre.

Retirement benefits also show up as a recruiting differentiator. Indeed lists 403(b) access as a defining benefit nonprofit job seekers specifically look for when comparing offers.

Which Plan Is Better for a Nonprofit Employer?

Neither plan is universally better. A SHRM compliance guide notes that roughly 80% of the more than 650,000 U.S. defined contribution plans are 401(k)s, reflecting how dominant that structure has become even in some nonprofit and hybrid settings.

The right choice often comes down to administrative capacity and whether the organization wants to offer a match. Communicating either plan's value clearly through benefits management software helps employees actually understand and use the retirement benefit they're offered.

Whichever plan an organization chooses, the stakes extend beyond any single employer. The World Economic Forum has tracked a widening global gap between retirement savings and retirement income needs, underscoring why access to either plan type matters at all.

For organizations weighing both options, comparing structures side by side against a 401(a) defined benefit plan can also clarify whether a defined contribution model fits better than a promised-benefit approach.

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Frequently Asked Questions

Q: Can a nonprofit offer both a 401(k) and a 403(b)?

A: Yes. Tax-exempt organizations are legally allowed to sponsor both plan types simultaneously, though most choose one to simplify administration.

Q: Do 401(k) and 403(b) plans have the same contribution limits?

A: Yes, both share the same annual IRS employee deferral limit and age-50 catch-up contribution, with 403(b) plans offering an additional 15-years-of-service catch-up in some cases.

Q: Is a 403(b) always exempt from ERISA?

A: No. A 403(b) is only ERISA-exempt under specific conditions, such as when the employer makes no contributions and involvement is limited to administrative tasks.

Q: Which plan typically offers more investment choices?

A: 401(k) plans generally offer a broader menu, including mutual funds, ETFs, and individual stocks, while 403(b) plans have historically been limited to annuities and mutual funds.

Q: Is employer matching common in a 403(b) plan?

A: It's less common than in 401(k) plans, largely because nonprofit budgets constrain discretionary employer contributions, though many organizations still offer a partial match.