403(b) vs. 401(k): What’s Actually Different?
A 403(b) is the 401(k)’s counterpart for public schools, 501(c)(3) nonprofits, and churches. The 2026 limits are identical ($24,500 in deferrals plus the same catch-ups), and if you have both plans in one year, the deferral limit is shared, not doubled. The real differences are the investment menu, ERISA coverage, and a special 15-year catch-up.
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$24,500
Same elective deferral limit as a 401(k), shared across both plan types · + $8,000 catch-up at 50+, or $11,250 at ages 60–63 · + up to $3,000/year 15-year service catch-up at qualifying employers ($15,000 lifetime)
Source: IRC §§402(g), 414(v), 402(g)(7); IRS Notice 2025-67
Who gets a 403(b) instead of a 401(k)?
This is not a choice you get to make. Eligibility follows the employer, so you end up with whichever plan your workplace is legally allowed to sponsor.
403(b) plans may be sponsored only by public schools and universities, by 501(c)(3) tax-exempt organizations such as most hospitals, charities, and private colleges, and by churches (IRC §403(b)). If you teach in a public district or work for a nonprofit hospital, a 403(b) is almost certainly your workplace plan. Corporate employers offer 401(k)s instead.
Some nonprofit employees see both plan types, which causes a lot of confusion. A nonprofit can legally sponsor a 401(k) instead of a 403(b), or alongside one, and many governmental employers pair a 403(b) with a 457(b). That last pairing is the one worth paying attention to, because it is the only combination that genuinely doubles your deferral room.
Key differences in 30 seconds
- Contribution limits are identical. Both plans use the same $24,500 deferral limit and the same catch-ups for 2026.
- One shared limit, not two. If you have a 403(b) and a 401(k) in the same year, your deferrals to both count against a single $24,500 cap.
- The 403(b) has an extra catch-up. After 15 years with a qualifying employer, you may be able to defer up to $3,000 more per year, capped at $15,000 over your lifetime.
- Investment menus differ by law. A 403(b) can hold only annuity contracts and mutual-fund custodial accounts, and older school-district plans are often annuity-heavy and expensive.
- ERISA coverage is not automatic. Public school and church 403(b)s are exempt from ERISA, so nobody has a legal duty to police fees for you. Every private-employer 401(k) is an ERISA plan.
- Everyone can defer from day one. A 403(b) follows the universal availability rule instead of ADP testing, so there is usually no eligibility waiting period and no risk of refunded deferrals.
Are 403(b) contribution limits the same as 401(k) limits?
Yes, exactly the same. Both plans run on the same 402(g) elective deferral limit of $24,500 for 2026, and both use the same catch-ups, which are $8,000 at age 50 and over, or $11,250 at ages 60 through 63 (IRS Notice 2025-67).
The 2026 Roth catch-up mandate applies equally to both plan types. If your FICA wages from the employer exceeded $150,000 in 2025, your catch-up contributions have to go in as Roth money rather than pre-tax (SECURE 2.0 §603). This caught a lot of payroll departments off guard, so if you are near that wage level it is worth confirming your election before January.
Two more rules carry over without change. Pre-tax and Roth deferrals share the one limit in both plan types, and the $72,000 total-additions cap (IRC §415(c)) applies to a 403(b) exactly the way it applies to a 401(k).
Contributing to both plans in the same year
You get one $24,500 limit, not two. This is the mistake that costs people real money, usually when they change jobs mid-year and nobody tells them the limits combine.
The 402(g) limit is a per-person limit, and 401(k) and 403(b) deferrals are added together against it. Defer $15,000 into a hospital 403(b) and you have only $9,500 of room left in any 401(k) that same year. Go over and you have created an excess deferral, which has to be distributed by April 15 of the following year or you end up taxed on the same dollars twice.
Your employers will not catch this for you, because neither one can see the other’s payroll. Tracking the combined total is your job, and the easiest way to do it is to add up your year-to-date deferrals from both pay stubs before you set the second job’s election. The one major plan type with a genuinely separate limit is the governmental 457(b).
The 403(b) 15-year catch-up
This is one catch-up that 401(k) participants simply do not get. If you have 15 or more years of service with a qualifying employer, meaning an educational organization, hospital, church, or certain health and welfare service agencies, you may be able to defer up to an extra $3,000 per year, capped at $15,000 over your lifetime (IRC §402(g)(7)).
Two honest caveats come with it, and both matter before you count on the money. First, the real amount you qualify for is the least of three separate tests based on your years of service and everything you have deferred in the past. Long-time maximum savers often qualify for little or nothing, because the provision was designed to help people who under-saved in earlier years catch back up.
Second, the calculation is notoriously error-prone, and not every 403(b) plan offers the feature at all. If you think you qualify, ask your plan administrator to run the computation rather than estimating it yourself. Your plan document controls whether the option exists, and your service history controls how much of it you can actually use.
Investment options: annuities vs. mutual funds
This is where the comparison has historically favored the 401(k), and it is the part of the 403(b) world worth being genuinely careful about. By statute, a 403(b) can hold only two kinds of investments. Those are annuity contracts under 403(b)(1) and custodial accounts holding mutual funds under 403(b)(7).
The plan type grew up in the insurance industry, and that history still shows. Many 403(b)s are built on annuity products carrying high fees and surrender charges that can run for years after you stop contributing. K-12 school plans are the worst offenders, because dozens of vendors may be approved to sell to teachers individually, often in the faculty lounge.
That is a warning, not a verdict. Plenty of modern 403(b)s, particularly at universities and large nonprofits, offer low-cost mutual-fund menus every bit as good as a strong 401(k). Read your fee disclosure and find out which kind you have. If your options are annuity-wrapped and expensive, look for a low-cost custodial mutual-fund vendor on your employer’s approved list and direct new money there instead.
ERISA coverage in 403(b) plans
Whether ERISA covers your plan depends on who sponsors it, and the answer matters more than most participants realize. ERISA brings fiduciary duties, fee-disclosure requirements, and strong creditor protection, which is to say it puts someone legally on the hook for watching out for you.
Governmental plans, including public schools, and church plans are exempt from ERISA by definition. Nonprofit 403(b)s that receive employer contributions are generally ERISA-covered. A deferral-only 403(b), where the employer keeps its involvement minimal, can remain outside ERISA entirely.
In a non-ERISA plan, nobody is legally obligated to monitor fees on your behalf. That is one more reason the fee homework in the section above falls to you personally. Every 401(k) at a private employer, by contrast, is an ERISA plan with a fiduciary attached to it.
The universal availability rule
Here is a quiet advantage that runs the other direction. Instead of the 401(k)’s nondiscrimination testing for deferrals, 403(b)s follow a rule called “universal availability.”
The idea is simple. If the employer lets any employee defer, it generally has to let all employees defer, starting from day one, with only narrow exclusions such as employees who normally work under 20 hours a week and certain students. There is no waiting a year to become eligible.
The practical payoff shows up for higher earners. Because there is no ADP testing in a 403(b), your deferrals can never be refunded to you in March because too few of your coworkers participated. In a 401(k), that happens to highly compensated employees every year.
Withdrawals, loans, and RMDs
On the withdrawal side, the two plan types run almost perfectly parallel. The 10% early-withdrawal penalty before 59½ and all of its exceptions, including the rule of 55, apply to 403(b)s just as they do to 401(k)s.
Plan loans follow the same §72(p) limits where the plan offers them, which is the lesser of $50,000 or 50% of your vested balance. RMDs begin at age 73, or 75 if you were born in 1960 or later, and Roth 403(b) accounts have no lifetime RMDs. Hardship rules mirror the 401(k)’s as well.
The same caveat applies to every line above. Your plan document decides which of these features your employer actually offers, and federal law permits far more than any single plan tends to include.
| Feature | 403(b) | 401(k) |
|---|---|---|
| Who can sponsor it | Public schools and universities, 501(c)(3) nonprofits, churches | Private employers of any size, and some nonprofits by choice |
| 2026 deferral limit | $24,500 | $24,500 |
| Age-50 and 60–63 catch-ups | $8,000 and $11,250 | $8,000 and $11,250 |
| Limit if you have both in one year | One shared $24,500 limit across both plans | |
| 15-year service catch-up | Up to $3,000/year, $15,000 lifetime, at qualifying employers | Not available |
| Total additions cap | $72,000 | $72,000 |
| Investments allowed | Annuity contracts and mutual-fund custodial accounts only | Whatever the plan’s fiduciary selects, typically mutual funds and collective trusts |
| ERISA coverage | Depends. Public school and church plans are exempt. | Always, at private employers |
| Eligibility to defer | Universal availability, generally from day one | Plan sets eligibility, and ADP testing can refund deferrals to high earners |
| Loans | Allowed if the plan offers them, same §72(p) limits | Allowed if the plan offers them |
| Early-withdrawal penalty and rule of 55 | Same rules as a 401(k) | 10% before 59½ unless an exception applies |
| RMDs | Age 73, or 75 if born in 1960 or later | Age 73, or 75 if born in 1960 or later |
Frequently asked questions
Can I max out both a 403(b) and a 401(k)?
Not separately, no. Your deferrals across both plans share one $24,500 limit for 2026 (IRC §402(g)), though you can split that amount between them in any proportion you like. The combination that truly doubles your deferral room is a 403(b) plus a governmental 457(b), which carries its own separate $24,500 limit.
Can I use both the 15-year catch-up and the age-50 catch-up?
Yes, in the same year, if you qualify for both. The rules apply amounts above the regular limit to the 15-year catch-up first and then to the age-50 catch-up. That ordering matters, because it eats into your $15,000 lifetime cap before it touches the age-based catch-up. Ask your administrator to compute it rather than assuming the order runs the other way.
Is a 403(b) better or worse than a 401(k)?
The tax mechanics are identical, so neither plan type is inherently better. A 403(b) with a low-cost mutual-fund menu matches any good 401(k), and universal availability means you can usually start deferring immediately instead of waiting out an eligibility period. A high-fee annuity-based 403(b) is meaningfully worse. The vendor menu, not the plan type, decides which one you have.
Can I roll a 403(b) into a 401(k) or an IRA?
Yes. Once you have a distributable event, such as leaving your employer, 403(b) balances are eligible for rollover to a 401(k), another 403(b), a governmental 457(b), or an IRA. Use a direct rollover, where the money goes straight from one institution to the other, because that avoids the mandatory 20% federal withholding that applies when a check is made out to you.
Do 403(b) plans have employer matching?
They can, though matching is less common than it is in 401(k)s. Many school districts contribute nothing at all, while universities often contribute generously, so the answer really depends on your employer. Employer contributions can also push a nonprofit plan into ERISA coverage, and that money may sit in a separate account with a vesting schedule attached. Your plan document controls both points.
Related reading
- 457(b) vs. 401(k): the separate limit and the no-penalty rule
- All 2026 contribution limits in one table
- Catch-up contributions: age 50+, ages 60–63, and the Roth mandate
Sources: IRS: 403(b) tax-sheltered annuity plans · IRC §403(b) · IRS Notice 2025-67 (2026 limits) · DOL EBSA (ERISA coverage)