What Is a 403(b)? Contribution Limits & How It Works

Last updated 04/29/2026 by

Ante Mazalin

Edited by

Andrew Latham

Fact checked by

Andy Lee

Summary:

A 403(b) is a tax-advantaged retirement plan offered by public schools, non-profits, and religious organizations that allows employees to contribute pre-tax or after-tax earnings for retirement.

It functions similarly to a 401(k) but with unique features, including a special 15-year catch-up provision.

Eligible employers: Public schools, 501(c)(3) nonprofits, and certain religious organizations.
Contribution limits: $23,000 annually ($30,500 if age 50+) in 2024, with potential additional catch-up contributions.
Tax treatment: Traditional 403(b) contributions reduce current taxable income; Roth options available in some plans.
Unique feature: The 15-year catch-up rule allows eligible employees to contribute an extra $3,000 per year (up to $15,000 lifetime).

A 403(b) plan—formally known as a tax-sheltered annuity (TSA)—provides a pathway for employees in the nonprofit and education sectors to save for retirement while reducing their current tax burden. Unlike more widely known plans like 401(k)s, the 403(b) exists in a narrower institutional space but offers comparable benefits and one distinctive advantage: the 15-year catch-up provision that lets long-tenured employees accelerate their savings.

Who is eligible for a 403(b)?

Not all employers offer 403(b) plans. The plan is exclusively available to employees of public schools (K–12 and higher education), tax-exempt organizations classified as 501(c)(3) nonprofits, and certain religious institutions. Examples include teachers, counselors, administrators, nurses at nonprofit hospitals, social workers at nonprofits, and clergy members.

Some employers allow part-time and temporary employees to participate, though eligibility requirements vary by plan. Self-employed individuals and employees of for-profit companies cannot access a 403(b); they may use alternative plans like SEP IRAs or Solo 401(k)s instead.

403(b) contribution limits

The IRS sets annual contribution limits that align closely with 401(k) thresholds. Here’s the 2024 landscape:

Category	2024 Limit
Employee deferral (under 50)	$23,000
Employee deferral (age 50+)	$30,500
Age 50+ catch-up	$7,500
15-year catch-up (eligible employees)	$3,000/year (up to $15,000 lifetime)
Total with employer match	$69,000 (2024, including all contributions)

The 15-year catch-up is a unique 403(b) feature that applies to employees with 15 or more years of service at the same employer. This provision allows an additional $3,000 annual contribution (with a $15,000 lifetime cap), providing significant flexibility for employees nearing retirement who started late with savings.

403(b) vs. 401(k): key differences

The 403(b) and 401(k) operate on similar principles, but important distinctions exist. Here’s how they compare:

Feature	403(b)	401(k)
Eligible employers	Schools, nonprofits, religious orgs	For-profit companies
Employee contribution limit (2024)	$23,000 ($30,500 at 50+)	$23,000 ($30,500 at 50+)
Employer match	Common but not required	Common but not required
Catch-up provisions	Standard (age 50+) + 15-year rule	Standard (age 50+) only
Investment options	Annuities, mutual funds, sometimes ETFs	Mutual funds, stocks, bonds, brokerage windows
Required Minimum Distributions (RMDs)	Age 73	Age 73

Both plans feature the same tax advantages and early withdrawal penalties (10% fee before age 59½), but the 403(b) vs. 401(k) distinction matters most when considering employer type and long-term catch-up strategy.

Pro Tip

If you’ve been at your nonprofit or school for 15+ years, don’t overlook the 15-year catch-up provision. This unique 403(b) feature allows you to contribute an extra $3,000 per year (up to $15,000 lifetime) on top of standard limits. It’s one of the most overlooked retirement acceleration tools for long-tenured educators and nonprofit workers.

Investment options in a 403(b)

403(b) investment menus historically centered on annuities and mutual funds, reflecting the plan’s origins in the insurance industry. However, plan diversity has expanded significantly, especially at larger employers.

Your plan may offer fixed annuities (guaranteed returns), variable annuities (market-linked returns), mutual funds, or even a brokerage window for broader stock and bond access. Annuities carry embedded fees—typically 0.5% to 1.5% annually—which can compound into meaningful drag over decades. Before selecting investments, review your plan’s fee schedules and compare mutual fund expense ratios.

Some employees access a Roth IRA as a complement to their 403(b) to diversify tax treatment. This dual-account strategy provides flexibility in retirement: withdraw from the traditional 403(b) for current tax deductions, use the Roth IRA for tax-free growth and qualified withdrawals.

How to maximize your 403(b)

Enroll early: Start contributions as soon as eligible to capture years of compound growth; even modest amounts compound significantly over decades.
Capture employer match: Contribute at least enough to receive your full employer match (typically 3–5%); this is immediate, guaranteed return on investment.
Increase over time: Raise your deferral percentage by 1% annually when you receive a raise to reach maximum contribution limits without painful budget cuts.
Review investment fees: Compare mutual fund expense ratios and annuity fees; even 0.5% in excess fees costs thousands over 30 years.
Track the 15-year rule: At 15 years with your employer, activate the additional $3,000 annual catch-up to accelerate final-stretch savings.
Plan for RMDs: Begin withdrawals at age 73 (per SECURE 2.0); calculate expected RMDs to manage tax brackets and avoid penalties.

Good to know: Government employees often have access to both a 403(b) and a 457(b) plan. The 457(b) is a separate deferred compensation plan with its own annual contribution limits ($23,000 in 2024). You can max out both plans independently, potentially doubling your annual tax-advantaged retirement savings—a powerful strategy often underutilized by government workers.

Frequently asked questions

Can I have both a 403(b) and an IRA?

Yes. You can simultaneously contribute to a 403(b) and a traditional or 403(b) vs. Roth IRA comparison to evaluate tax strategies. However, traditional IRA contributions may be non-deductible if your 403(b) employer plan makes you ineligible for a full deduction, depending on your income. A tax advisor can clarify your specific situation.

What happens to my 403(b) if I leave my job?

Your vested balance remains yours. You can roll it into an IRA or your new employer’s plan (if eligible) to consolidate accounts and potentially access lower-cost investments. Non-vested employer contributions may be forfeited, so review your vesting schedule before departing.

Can I withdraw from my 403(b) before age 59½?

Early withdrawals incur a 10% penalty plus ordinary income tax. However, exceptions exist: substantially equal periodic payments (SEPP), hardship withdrawals (medical, education, home purchase in some cases), or loans from your plan (if offered). Each path has specific IRS requirements; consult a tax professional before proceeding.

Is a 403(b) the same as a pension?

No. A 403(b) is a defined contribution plan—you control contributions and investment choices, bearing investment risk. A pension is a defined benefit plan where your employer guarantees a specific retirement payment. Some educators receive both: a small pension plus a 403(b) option.

What’s the difference between traditional and Roth 403(b)?

Traditional 403(b) contributions reduce your current taxable income; you pay taxes on withdrawals in retirement. Roth contributions come from after-tax income but grow tax-free and allow tax-free qualified withdrawals. Roth is advantageous if you expect higher taxes in retirement or want tax-free growth.

Starting a 403(b) early—even with modest contributions—leverages compound growth to build substantial retirement assets. If your employer offers this plan, prioritize enrollment and gradually increase contributions as your salary grows. For specific guidance on contribution timing or investment allocation, consult a financial advisor familiar with 403(b) plans.

Key takeaways

A 403(b) is a retirement plan exclusively for school employees, nonprofit workers, and clergy, offering tax-deferred or Roth growth options.
2024 contribution limits are $23,000 ($30,500 at age 50+), matching 401(k) thresholds, with a unique 15-year catch-up provision worth up to $3,000 annually.
Investment options typically include annuities and mutual funds; review fee structures carefully, as high fees can substantially reduce long-term returns.
The 403(b) and 401(k) function similarly but differ in eligible employers and catch-up rules; compare both if you have options.
Required Minimum Distributions begin at age 73; plan ahead to minimize tax impact in retirement.