What Is a 403(b) Plan? 2026 Guide

A 403(b) plan is a tax-advantaged retirement savings account available to employees of public schools, universities, hospitals, nonprofits, and certain other tax-exempt organizations. It works similarly to a 401(k) — you contribute pre-tax money, it grows tax-deferred, and you pay income tax only when you withdraw funds in retirement. If you work in education, healthcare, or the nonprofit sector and your employer offers a 403(b), it is one of the most powerful retirement tools available to you.

How a 403(b) Works

Contributions come from your paycheck before income taxes are calculated. This lowers your current taxable income — if you contribute $5,000 in a year, you pay income tax on $5,000 less of your earnings. Inside the account, investments grow without being taxed annually. When you retire and take withdrawals (after age 59½), you pay ordinary income tax on the amount withdrawn.

Many employers also offer a Roth 403(b) option. Roth contributions are made with after-tax dollars, grow tax-free, and qualified withdrawals are completely tax-free in retirement. This mirrors the 401(k) vs. Roth 401(k) choice.

2026 Contribution Limits

For 2026, the 403(b) contribution limits are the same as the 401(k):

Employee contribution limit: $23,500 per year
Catch-up contribution (age 50+): Additional $7,500 per year, for a total of $31,000
Special catch-up (age 60–63): Under SECURE 2.0, employees age 60–63 can contribute an enhanced catch-up of $11,250 starting in 2025, for a total of $34,750
Total combined limit (employee + employer contributions): $70,000

The 15-Year Rule: Extra Catch-Up for Long-Tenured Employees

One feature unique to 403(b) plans is the 15-year catch-up provision. If you have worked for the same qualifying employer for at least 15 years and have averaged less than $5,000 in annual contributions over your career, you may be able to contribute an extra $3,000 per year (up to a lifetime total of $15,000). This provision is not available in 401(k) plans.

Employer Matching and Vesting

Many 403(b) plan sponsors offer employer matching contributions — free money added to your account based on how much you contribute. Common match structures include 50% of your contribution up to 6% of salary, or dollar-for-dollar up to 3%. Always contribute enough to capture the full employer match before doing anything else.

Employer contributions may be subject to a vesting schedule — you earn full ownership of matching funds over time (e.g., 20% per year over 5 years, or 100% immediately with cliff vesting at 3 years). Check your plan documents.

Investment Options in a 403(b)

403(b) plans traditionally offered only annuity products from insurance companies, which often carry high fees. Today, many plans also offer mutual funds and index funds. Unfortunately, 403(b) plans — especially in K-12 education — have historically included high-cost investment options. If your plan offers low-cost index funds, prioritize those. If options are limited and fees are high, contribute enough to get the match, then consider maxing out an IRA (Roth or traditional) in a lower-cost account like Fidelity or Vanguard.

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

Both have the same contribution limits and tax treatment.
403(b) is available to nonprofit, education, and healthcare employees. 401(k) is for most private-sector employers.
403(b) plans have the 15-year catch-up provision; 401(k) plans do not.
403(b) plans have historically had fewer investment options and more annuity products.
Both can offer traditional and Roth contribution options.

Withdrawals and RMDs

Withdrawals before age 59½ are subject to ordinary income tax plus a 10% early withdrawal penalty (with exceptions for disability, death, certain medical expenses, and others). Required Minimum Distributions (RMDs) must begin at age 73. Roth 403(b) contributions are no longer subject to RMDs starting in 2024, thanks to SECURE 2.0.

Bottom Line

A 403(b) is among the most valuable retirement tools available to public-sector and nonprofit workers. Contribute at least enough to capture the full employer match, choose low-cost index funds whenever available, and consider using a Roth 403(b) if you expect your tax rate to be higher in retirement. If your plan’s investment options are poor, supplement with a Roth IRA for better fund selection.