The Physician's Retirement Stack: Building Tax-Advantaged Space at Attending Income

Natalie C. Papagni, CPA

Sep 28

5 min read

Updated: 3 hours ago

At a 32% to 35% marginal rate, every pre-tax dollar you shelter is worth more than it ever was in residency. The accounts stack, but only if you use them in the right order and start before the deadlines close.

Most physicians arrive at attending income with a single retirement account, the hospital 401(k) or 403(b), and treat it as the whole plan. It isn't. At attending compensation, several tax-advantaged accounts can be layered on top of one another, each with its own limit, its own deadline and its own interaction with the others. Used together, they shelter far more than the headline 401(k) number. Used in isolation, most of that space goes unclaimed, and unlike a deduction you can catch next year, contribution room doesn't carry forward.

2026 limits at a glance

401(k) / 403(b) deferral: $24,500, plus $8,000 at 50 or older, or $11,250 at ages 60 through 63
457(b) deferral: a separate $24,500
Total from all sources in one plan: $72,000
HSA: $4,400 self-only, $8,750 family, plus $1,000 at 55 or older
IRA for the backdoor Roth: $7,500 each, or $8,600 at 50 or older

Layer one: the workplace 401(k) or 403(b)

This is the foundation, and for most employed physicians the largest single layer. For 2026, you can defer $24,500 of your own salary, plus an $8,000 catch-up at 50 or older, or an $11,250 catch-up if you're 60 through 63. Employer contributions and any after-tax additions count toward a combined ceiling of $72,000.

Beginning in 2026, if your prior-year FICA wages from the employer sponsoring your plan exceeded $150,000, every catch-up dollar must go in as Roth. For nearly every attending 50 or older, this isn't optional. It's a wage test, not an income test, and it looks only at last year's wages from that employer.

Layer two: the 457(b), the physician's second deferral

This is the layer many physicians don't know they have. If your employer, often a hospital, university or non-profit health system, offers a 457(b) alongside the 401(k) or 403(b), it carries its own separate $24,500 limit. A physician with access to both can defer $49,000 of salary in a single year before any employer contribution.

The distinction worth understanding: a governmental 457(b), at a public hospital or state university, holds your money in trust, much like a 401(k). A non-governmental 457(b), at many private non-profit systems, remains an asset of the employer until paid out, which brings creditor risk and less flexible distribution rules. The tax advantage is real either way, but the plan document is worth reading before you rely on it.

Layer three: the HSA

If you're enrolled in a qualifying high-deductible health plan, the health savings account is triple tax-advantaged federally: contributions go in pre-tax, growth is untaxed, and withdrawals for qualified medical expenses are never taxed. Contributing through payroll also avoids payroll tax.

Many physicians spend their HSA down each year. Used instead as a long-term account, paying medical costs out of pocket now and leaving the balance invested, it becomes one of the most efficient dollars in the stack. One California caveat: the state doesn't recognize HSAs, so contributions and earnings are taxable on your California return. It's usually still worth funding, just less of a bargain here than in most states.

Layer four: the backdoor Roth, for you and a spouse

Attending income almost always exceeds the Roth IRA limits, which close at $168,000 (single) or $252,000 (joint) for 2026. The backdoor remains open: a non-deductible contribution to a traditional IRA, converted to Roth. Done for both you and a spouse, it adds $7,500 each of Roth space a year, or $8,600 at 50 or older.

The trap is the pro-rata rule. If you hold any pre-tax IRA balances, such as a rollover from a prior employer, a SEP or a SIMPLE, the conversion is taxed proportionally across all your IRA money, not just the new contribution. Clearing those balances first, often by rolling them into a current 401(k) or 403(b), is what makes the backdoor clean.

Layer five: the solo 401(k), if you have 1099 income

If you earn independent income from moonlighting, locums, expert-witness work, telehealth or a side practice, you can open a solo 401(k) for that business. Your $24,500 employee deferral is shared across all your 401(k) and 403(b) plans, so if you've maxed it at the hospital, the solo 401(k)'s value comes from the employer side: up to 20% of net self-employment earnings.

How much total room that adds depends on your hospital plan. If the hospital plan is a 401(k), the solo 401(k) generally has its own separate $72,000 ceiling. If it's a 403(b), the two plans share a single $72,000 ceiling, because a 403(b) is treated as your own plan for this purpose. That distinction changes how much the solo 401(k) can hold, and it's often missed.

For a physician with substantial, stable 1099 income, a cash balance plan can sit on top of the solo 401(k) and shelter considerably more. It's the top of the stack, and worth its own analysis.

The order the layers go on

Capture the full employer match. It's an immediate return no other layer offers.
Fund the HSA, if you're eligible.
Finish the 401(k) or 403(b) deferral.
Add the 457(b), if your employer offers one.
Run the backdoor Roth for both spouses, after clearing pre-tax IRA balances.
Layer the solo 401(k), and any cash balance plan, once the 1099 income is quantified.

Getting the order right matters more than getting any single layer to its maximum, because the early layers carry the highest return per dollar and the tightest deadlines.

The engineer and the chess player

Each layer has exact rules: limits, catch-up tests, the pro-rata calculation and the shared-ceiling rule for 403(b) plans. That's the engineer's work. The chess player's question is how the layers interact with the rest of your tax picture over time: a pre-tax deferral that keeps income under the SALT phase-down line, a rollover one year that makes the backdoor Roth clean the next, a solo 401(k) funded in a year when locums income spikes. The stack is a sequence of moves, not a list of accounts.

The bottom line

At attending income, tax-advantaged accounts stack far higher than the single workplace plan most physicians rely on. A 457(b) can double the workplace deferral, an HSA is one of the most efficient dollars available, a backdoor Roth adds space for both spouses, and 1099 income can open a solo 401(k) or a cash balance plan on top. But contribution room doesn't carry forward, several layers have year-end deadlines, and the order determines how much of each dollar you keep.

Discuss your situation with Natalie C. Papagni, CPA

If you'd like your full retirement stack inventoried and sequenced, including the 457(b) and solo 401(k) that often go unnoticed and a backdoor Roth cleared of pro-rata traps, a complimentary 30-minute consultation is the natural first step.

Natalie C. Papagni, CPA — Tax, Planning & Advisory Services 4275 Executive Square, Suite 200, La Jolla, CA 92037 (858) 754-8277 | service@lajollataxcpa.com | lajollataxcpa.com

Disclaimer: This material is provided for general educational purposes only. It is not tax, legal or accounting advice, and it does not create a CPA–client relationship. Tax outcomes depend on individual facts and circumstances, and figures and rules change from year to year. Consult a qualified professional about your specific situation before acting. Figures reflect 2026 federal limits under IRS Notice 2025-67 and Rev. Proc. 2025-19.