403(b) vs. 401(k): What Hospital-Employed Physicians Should Know About Their Retirement Plan

You started at the hospital, sat through forty minutes of benefits onboarding, checked a box next to a contribution percentage, and moved on to credentialing. Months later a colleague in the lounge mentions their 401(k), you glance at your own statement, and it says 403(b) instead. Same thing? Different rules? Nobody in orientation explained it, and the plan document runs ninety pages.

Here is the short version. Your 403(b) and your colleague's 401(k) do most of the same work, under the same annual dollar limits, with the same tax treatment. The differences that matter are narrower than you might expect, and they sit in places the benefits summary rarely highlights: the investment menu, whether federal retirement-plan protections apply, one catch-up provision that exists in 403(b) plans and nowhere else, and a limit-stacking rule that surprises physicians with moonlighting income. Those four things matter, because the rest of your retirement planning as a physician is built on top of whichever plan your employer happens to sponsor.

Neither plan type is better in the abstract. A well-run 403(b) at a nonprofit health system can be a better place to save than a mediocre 401(k) at a for-profit one, and the reverse is just as common. What determines the answer is the specific plan document, the investment menu, the employer contribution formula, and what else your household has going on. If you are still in your first year out of training, the attending transition checklist covers where the retirement plan decision sits among everything else landing at once.

Why Your Hospital Sponsors a 403(b) at All

The plan type is determined by your employer's tax status, not by anything about you or your specialty. Section 403(b) plans are available to public schools, certain tax-exempt organizations under Section 501(c)(3), and cooperative hospital service organizations. The Internal Revenue Service description of 403(b) tax-sheltered annuity plans lays out that eligibility list. A nonprofit health system, a university medical center, a county hospital district, and a faith-affiliated system can all sponsor one. A physician-owned group, a private-equity-backed platform, and a for-profit hospital chain cannot, so those employers sponsor 401(k) plans instead.

Which means the plan on your statement is mostly a result of where you signed. According to a 2024 analysis published by the American Medical Association, 34.5 percent of physicians worked in hospital-owned practices in 2024, up from 23.4 percent in 2012, and 12 percent were employed directly by or contracted directly with a hospital. If your practice arrangement has changed in the last decade, there is a reasonable chance your plan type changed with it, and that you now have a former-employer account sitting somewhere under a different set of rules.

The 403(b) also carries some history. These plans predate 401(k) plans by roughly two decades and started life as tax-sheltered annuity arrangements sold by insurance companies to teachers and hospital staff. Most large hospital systems have modernized well past that, but the legacy shows up in a few plans as annuity contracts still sitting on the investment menu. More on that below.

403(b) vs. 401(k), Side by Side

Here is how the two plan types line up on the features physicians ask about most. Every figure below reflects 2026 limits, and every row marked "check your plan document" varies by employer rather than by law.

Where the Two Plans Behave Identically

The dollar limits are the same, and this is the part you might assume is different. The Internal Revenue Service announcement of 2026 retirement plan limits sets the employee deferral limit at $24,500 for 401(k), 403(b), and governmental 457(b) plans together, with an $8,000 catch-up at age 50 and $11,250 for the years you turn 60 through 63. The combined employee-plus-employer ceiling under Section 415(c) is $72,000 for 2026 per the Internal Revenue Service cost-of-living adjustment schedule.

The tax treatment is also the same. Pre-tax deferrals reduce current taxable income and are taxed at ordinary rates on withdrawal. Roth deferrals go in after tax and come out tax-free if the rules are followed. Employer contributions land pre-tax unless the plan offers a Roth match election. Distributions before age 59 and a half generally carry a 10 percent penalty with the usual exceptions, and required minimum distributions (the withdrawals the Internal Revenue Service mandates starting at age 73) apply the same way.

Portability works the same too. Both plan types can generally be rolled to an individual retirement account or into a new employer's plan when you leave. That rollover decision carries its own trade-offs, particularly if you use a backdoor Roth strategy, since a pre-tax IRA balance changes the tax math on conversions.

And the availability of Roth deferrals, after-tax contributions, and in-plan Roth conversions is a plan-design choice in both. Neither plan type is inherently more or less generous here. If your hospital plan happens to allow after-tax contributions with in-plan conversion, the mechanics described in our piece on the mega backdoor Roth inside hospital plans apply whether the plan is labeled 403(b) or 401(k).

Where the Differences Actually Show Up

The Investment Menu and Its Annuity History

The most practical difference for a lot of physicians has nothing to do with tax code sections. It is what you can actually buy inside the plan. Because 403(b) plans grew out of tax-sheltered annuity arrangements, some still carry annuity contracts on the menu, and a few older plans let multiple vendors compete for participants with individually sold products. Large health systems have mostly consolidated to a single recordkeeper with a conventional mutual fund lineup, but not all of them, and academic medical centers in particular sometimes maintain older vendor arrangements alongside newer ones.

Where this matters is cost, and cost compounds. The U.S. Securities and Exchange Commission investor bulletin on how fees and expenses affect your portfolio walks through how a difference of well under one percent per year in annual cost accumulates into a meaningful dollar figure across a long holding period. Annuity contracts inside retirement plans can layer insurance charges, administrative charges, and the operating costs of the underlying funds on top of one another, and some carry surrender charges that apply if you move the money within a set number of years. None of that makes an annuity contract inappropriate for every situation. It does make the line item worth a careful read, and it is the sort of thing to review with a CFP® professional or the plan's participant services line before deciding where new contributions go. The same principles that show up in investing for doctors apply inside an employer plan just as they do outside it.

Federal Retirement-Plan Protections Are Not Automatic in a 403(b)

A 401(k) sponsored by a for-profit employer is nearly always governed by Title I of the Employee Retirement Income Security Act, known as ERISA. That brings a fiduciary standard for the people selecting and monitoring the investment menu, an annual Form 5500 filing, and a specific set of participant disclosure rules. A 403(b) may or may not be covered. The U.S. Department of Labor guidance on reporting and coverage for 403(b) plans describes the exclusions: governmental plans sit outside Title I, church plans sit outside unless the sponsor elects in, and a long-standing safe harbor exempts plans funded solely by voluntary employee salary deferrals where employer involvement stays limited.

The practical read: if your hospital contributes to the plan, matches your deferrals, or restricts the vendor list, the plan is very likely covered. If you work for a county hospital district or a state university system, it probably is not, because governmental plans are excluded. That does not mean an uncovered plan is poorly run. State law, plan documents, and internal governance can all do similar work. It does mean the specific federal fiduciary standard you might assume applies to your account may not, and knowing which situation you are in changes how closely you read the menu yourself.

The 15-Year Catch-Up That Exists Nowhere Else

This provision is unique to 403(b) plans, and it is easy to leave on the table after a long career at one system. The Internal Revenue Service description of 403(b) catch-up contributions explains that an employee with at least 15 years of service with the same qualifying organization (hospitals are on the qualifying list) may defer an additional amount above the standard limit. It is the least of three figures: $3,000 for the year, $15,000 lifetime reduced by any special catch-up already used, or $5,000 times years of service minus all elective deferrals previously made to that employer's plans.

Two caveats come with it. First, the plan has to permit it, and not every plan does. Second, that third calculation disqualifies a lot of consistent high savers, because a physician who has maxed deferrals every year for fifteen years will usually have already exceeded $5,000 times years of service. The physicians who tend to qualify are the ones who contributed lightly during earlier years, which describes a fair number of people who came out of training with heavy debt and dialed up savings later. If that describes your history, run the calculation with your plan administrator, and the Internal Revenue Service also directs that the special catch-up be applied before the age-50 catch-up when both are available.

How the Total Contribution Ceiling Stacks When You Have 1099 Income

This difference has real teeth if you have 1099 income. Under a 401(k), the Section 415(c) ceiling is generally applied separately to each unrelated employer. A hospitalist with a W-2 401(k) at the hospital and a solo 401(k) for locums income gets a separate total ceiling on each, subject to the shared employee deferral limit across both.

A 403(b) works differently. The Internal Revenue Service issue snapshot on Section 415(c) aggregation explains that the participant, not the employer, is treated as maintaining the 403(b) annuity contract. So if you also control a business (more than 50 percent ownership) that sponsors its own defined contribution plan, that plan and your 403(b) are combined under a single $72,000 ceiling rather than getting separate ones.

If you are hospital-employed with a moonlighting PLLC and a solo 401(k), that is a real constraint. The hospital's contributions to your 403(b) count against the same ceiling as the profit-sharing contribution you were planning to make from self-employment income. You would typically discover it after the fact, when a tax preparer flags an excess contribution that has to be corrected. If you have side income and a 403(b), map the interaction between your plans before you fund the second one, and the trade-offs between plan types for that income are covered in our comparison of the solo 401(k) and the SEP-IRA for 1099 physician income.

The 457(b) That Often Sits Next to Your 403(b)

Many hospital-employed physicians with a 403(b) also see a 457(b) on the benefits menu, and the deferral limits are separate, so it looks like a straightforward way to shelter another $24,500. Whether it is depends entirely on one distinction that the enrollment materials sometimes bury.

A governmental 457(b), sponsored by a state or local government employer such as a public university health system or a county hospital, holds assets in trust for participants. Your money is yours. A non-governmental 457(b), sponsored by a nonprofit hospital, does not. Those assets legally remain property of the employer and are subject to the claims of the employer's general creditors until distributed. The distribution rules are also more restrictive, with limited rollover options and a payout schedule often locked in at election.

Our position on this is cautious. The forfeiture and creditor exposure in a non-governmental 457(b) is a real risk that many physicians accept without registering it, and we generally advise caution about routing money into non-governmental 457(b) plans when other tax-advantaged capacity remains unused. The full breakdown, including how the two versions differ on rollovers and distribution timing, is in our article on governmental versus non-governmental 457(b) plans for hospital-employed physicians.

What Physicians Typically Look For in the Plan Document

The summary plan description is the document that answers most of these questions, and it is usually available on the benefits portal in under a minute. Here is what tends to come up when physicians and their planners review one together.

• The employer contribution formula and whether it is a match, a non-elective contribution, or both. Some hospital systems put the match in a separate 401(a) account with its own vesting schedule, which is why your statement may show two balances.
• The vesting schedule on employer money. If you change systems every few years, you can leave unvested employer contributions behind without knowing the cliff date you were approaching.
• Whether Roth deferrals are offered. Availability varies more than you might expect, and it changes how the pre-tax versus Roth question gets weighed in high-earning years.
• Whether after-tax (non-Roth) contributions and in-plan Roth conversions are permitted. This is the gateway to the mega backdoor Roth mechanics, and some 403(b) plans do not offer it.
• Whether the 15-year catch-up is available, and what the plan's records show for your cumulative prior deferrals.
• Whether the plan offers a true-up if you front-load contributions early in the year. Without one, hitting the deferral limit by August can cost you match dollars for the remaining pay periods.
• The full expense list on each investment option, including any annuity charges, and whether a lower-cost tier of the same fund is available at your balance level.

None of that requires a finance background to read. It does require an hour you probably do not have lying around.

How the Conversation Changes by Career Stage

In your first few years as an attending, the questions are usually about capacity and order. How much can go in, what the match requires, whether pre-tax or Roth fits your household's current bracket, and how retirement contributions sit alongside student loan payments and a first home. The plan type barely enters into it at that stage. What matters is getting the match, understanding the vesting schedule, and setting up an allocation you can leave alone.

Mid-career is when the 403(b)-specific items start to matter. Fifteen years of service brings the special catch-up into play. Your accumulated balances make the expense line meaningful in dollars rather than percentages. Side income, medical directorships, expert witness work, and locums shifts create the 415(c) aggregation question. And by then many physicians have two or three old plan accounts from prior employers that have never been consolidated or reviewed.

Later on, the questions shift again toward distribution order, Roth conversion capacity in the gap years between retirement and required minimum distributions, and how the plan's payout options interact with the rest of your household's income. Those questions run through the same tax picture covered in tax strategies for doctors, and they are usually reviewed year by year rather than settled once.

Where This Fits in a Household Plan

The 403(b) versus 401(k) question turns out to be less about the plan label and more about what your specific plan document permits, what the menu costs, whether federal fiduciary standards apply, and how the plan interacts with everything else your household has going. A physician with one W-2 job and a well-run plan has a fairly simple picture. A physician with a 403(b), a non-governmental 457(b), a spouse's 401(k), 1099 moonlighting income, and two old accounts from residency and a first attending job has a coordination problem, and coordination problems do not resolve themselves.

For twenty-five years our work has been with physician families, and hospital plan questions are a regular part of it. What we bring to a plan review is a reading of the document and the trade-offs it creates for your household, not a recommendation to move anything anywhere.

If nobody has ever walked through your summary plan description with you, or side income has you wondering whether the aggregation rules apply to your accounts, an outside look can settle both questions. You can reach the team through physicianfamily.com/start or at contact@physicianfamily.com, and a stack of unread plan documents is a perfectly good reason to write.

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