Roth Conversion for Physicians

A Roth conversion for doctors runs on different math than for almost any other profession: physicians compress a career of earnings into roughly 25 peak years, stack pre-tax money into a 403(b), 457(b), and 401(a) at the same hospital, and then hit required minimum distributions large enough to push retirement income back into the brackets they spent their careers trying to escape.

Why the Roth conversion math is different for doctors

Physicians face a conversion problem few other savers have: almost no naturally low-income years between training and retirement. Income jumps from resident pay to attending pay in a single July and stays in the upper brackets for decades, while dual hospital plans build pre-tax balances fast. The result: a large future RMD liability and few cheap windows to defuse it.

Three features of the physician career arc drive the analysis:

• A compressed, high plateau. A $300,000 to $600,000 household rarely sees a 22% or 24% year between age 35 and retirement, so “convert in a low-income year” needs a plan for manufacturing that year.
• Dual-plan accumulation. An employed physician can defer up to $49,000 across a 403(b) and a 457(b) in 2026 at $24,500 each, because the two limits are not combined (Source: IRS multiple-plan deferral FAQ; IRS Notice 2025-67). Multi-million pre-tax balances by the early 60s are routine in this profession.
• A late RMD cliff. RMDs begin at 73, or 75 for those born in 1960 or later (Source: IRS RMD FAQs; SECURE 2.0 sec. 107). A physician retiring at 60 may have up to 15 low-bracket years, then RMDs that stack on Social Security and portfolio income for life.

The parent guide on how Roth conversions work covers universal mechanics; this page covers the physician math.

Should high income earners do Roth conversions while still practicing?

Sometimes. Converting in a 35% or 37% year is usually unattractive, since the same dollars could often be converted later at lower rates. But a long compounding horizon, projected RMD stacking, or heirs who will inherit under the SECURE Act 10-year rule can make a peak-year conversion defensible in specific fact patterns.

The question turns on marginal rates: the rate paid today versus the rate the same dollars would face when withdrawn, forced out as RMDs, or inherited. Converting at a high current rate can still pencil for a physician when:

• RMDs will stack. A balance large enough that projected RMDs, layered on Social Security and portfolio income, would land future withdrawals near today’s rate. The top rate is permanent at 37% for 2026 (Source: IRS Rev. Proc. 2025-32), so the “rates will snap back” argument is gone, but balance growth itself pushes future income up the schedule.
• Heirs sit in high brackets. Most non-spouse beneficiaries must empty an inherited traditional IRA within 10 years, and a physician’s children are often in peak earning years during that decade. Converting shifts the tax to the original owner’s rate.
• State arbitrage runs in reverse. A Texas, Florida, or Tennessee physician planning to retire in a high-tax state has the zero-state-tax years now, not later.

Waiting usually dominates when retirement lands before RMD age with gap years ahead, or when a move from a high-tax state is planned. The deciding tool is a multi-year projection; a Roth conversion break-even analysis makes the crossover explicit.

403(b) to Roth IRA conversion: how the hospital account stack behaves

A 403(b) can generally be converted to a Roth IRA after separation from service, or earlier through in-plan Roth conversion or an in-service rollover if the plan allows, with pre-tax amounts taxed as ordinary income (Source: IRS Pub. 590-A). The 457(b) is different: many hospital physicians hold the non-governmental kind, which follows its own rules.

The employed-physician stack usually has three or four layers:

• 403(b). Deferrals up to $24,500 in 2026, plus an $8,000 age-50 catch-up or $11,250 at ages 60 to 63 (Source: IRS Notice 2025-67). After separation, balances can roll to an IRA or convert to a Roth IRA in whole or in part.
• Non-governmental 457(b). Common at nonprofit hospitals. A separate $24,500 limit in 2026, but no age-50 catch-up, and the assets legally remain employer property exposed to the employer’s general creditors until paid out (Source: IRS, “Non-governmental 457(b) deferred compensation plans”). Payouts follow the plan document, often landing in the same low-income years a conversion ladder wants to use.
• Governmental 457(b). Found at university and state health systems; the $8,000 and $11,250 catch-ups apply, and balances are more portable at separation.
• 401(a). Employer-funded; usually rollable to an IRA at separation, where it becomes conversion inventory.

One 2026 wrinkle hits nearly every employed physician: catch-up contributions must be Roth if prior-year FICA wages from that employer exceeded $150,000 (Source: SECURE 2.0 sec. 603; IRS Notice 2025-67). Partners paid on a K-1, with no W-2 FICA wages, sit outside the mandate.

The fill the bracket Roth conversion strategy, in physician dollars

Filling the bracket means converting only the amount that uses up the remaining room in a target tax bracket each year, rather than a lump sum that spills into higher rates. A physician household usually has two guardrails: the top of the chosen federal bracket, and after age 63, the Medicare IRMAA tiers, which act like extra brackets with cliff edges.

A simplified 2026 illustration for a retired physician couple filing jointly: with $70,000 of interest, dividends, and consulting income and the $32,200 standard deduction (Source: IRS Rev. Proc. 2025-32), taxable income starts at $37,800, and a conversion sized to a chosen bracket top consumes only the space up to that line. Cross an IRMAA threshold by $1 after age 63 and the entire year’s Medicare surcharge tier applies, because IRMAA is a cliff, not a phase-in.

Sizing rules that matter more for physicians than for most households:

• Locums income, call stipends, and directorship fees arrive unevenly. Sizing the conversion in December, when the year’s income is nearly known, reduces overshoot risk; the deadline is December 31 (Source: IRS IRA FAQs).
• Conversions cannot be recharacterized (Source: IRS IRA FAQs); an overshoot cannot be undone in April.
• Targets shift with annual COLA adjustments and are recalculated every year. Our guide to how much to convert to Roth walks through the worksheet.

Roth conversion during residency, fellowship, and the other physician windows

Residency and fellowship are the cheapest conversion years a physician will ever see, and most trainees have little to convert. The realistic windows come later: the July-to-December half-year when training ends, sabbaticals and locums transitions, the late-career part-time glide, and the gap years between retirement and RMDs. A conversion plan maps all of them in advance.

One window is easy to miss: a non-governmental 457(b) paying out after separation occupies exactly the low-bracket years a conversion ladder needs. A longer payout election, where the plan allows it, spreads that income thin enough to leave conversion room beside it.

Backdoor Roth IRA for physicians vs. a full Roth conversion

The two get conflated constantly. A backdoor Roth IRA is a small annual maneuver: a nondeductible traditional IRA contribution followed by an immediate conversion, moving up to $7,500 in 2026, or $8,600 at 50 and older (Source: IRS Notice 2025-67). A Roth conversion moves existing pre-tax balances of any size and is taxed in proportion.

The backdoor exists because attending income exceeds the direct Roth IRA limits: the 2026 MAGI phase-out runs from $242,000 to $252,000 for joint filers and $153,000 to $168,000 for singles (Source: IRS 2026 COLA announcement). Conversions carry no income limit at all (Source: IRS Pub. 590-A). Both transactions are reported on Form 8606 and are irreversible once executed (Source: IRS IRA FAQs).

They play different roles: the backdoor is a recurring contribution channel during the earning years; the conversion repositions the balance sheet during the windows above. The annual backdoor does not address a $2 million 403(b), and a ladder does not replace the contribution habit; most physician plans use both.

The pro rata rule: the backdoor Roth trap for physicians with old IRAs

The pro rata rule aggregates all of a physician’s traditional, SEP, and SIMPLE IRAs when computing the taxable share of any conversion, calculated on Form 8606 (Source: IRS Pub. 590-A). A rollover IRA from a prior hospital job sitting next to a $7,500 nondeductible contribution makes the “tax-free” backdoor mostly taxable, since the conversion draws proportionally from the combined balance.

This bites physicians because career moves are structural: residency, fellowship, first attending job, partnership. Each move tends to leave a 403(b) that later becomes a rollover IRA, and each such IRA contaminates every future backdoor. Two clean fixes exist:

• Roll the pre-tax IRA into a current employer plan. Employer plans sit outside the pro rata aggregation, so moving pre-tax IRA money into the hospital 403(b), where roll-ins are accepted, restores a clean backdoor.
• Roll it into a solo 401(k). Moonlighting, call coverage, or expert-witness 1099 income supports a solo 401(k), which can absorb the pre-tax IRA.

The alternative is to stop fighting the rule and convert the contaminated balance during a planned low-income window, paying the tax once at a chosen rate. Which route wins depends on balance size and distance to the next window; the worksheet is in our pro-rata rule guide.

Mega backdoor Roth for doctors: the after-tax 403(b) channel

Where the plan allows it, a physician can contribute after-tax dollars above the $24,500 deferral limit, up to the overall 415(c) ceiling of $72,000 in 2026, and roll them into a designated Roth account through an in-plan Roth rollover, with only the earnings taxable at conversion (Source: IRS Notice 2025-67; IRS designated Roth FAQs).

The 2026 arithmetic: $72,000 minus $24,500 of deferrals minus employer contributions equals the after-tax headroom. A physician whose hospital contributes $20,000 in match and 401(a) money would have roughly $27,500 of space. Two plan features must both exist: after-tax employee contributions and in-plan Roth conversion or in-service rollover. Many hospital 403(b)s offer neither; the plan document, not the IRS, is the gatekeeper.

For peak-bracket years when large conversions do not pencil, this channel builds Roth balances with little added tax, since the contributions were already taxed and prompt rollovers leave minimal earnings. A plan checklist is in our mega backdoor Roth guide.

Roth conversion and IRMAA Medicare premiums: the age-63 lookback

Medicare premiums are set from MAGI two years earlier, so a conversion at 63 shows up in Part B and Part D surcharges at 65. The 2026 standard Part B premium is $202.90 per month; surcharges begin above $109,000 single or $218,000 joint of 2024 MAGI (Source: SSA POMS HI 01101.020). Conversions completed before the year a physician turns 63 never enter the lookback.

The 2026 Part B tiers, per person per month:

Part D adds its own income-based surcharge of $14.50 to $91.00 per month (Source: SSA POMS HI 01101.020). Two physician notes: Form SSA-44 lets a retiree appeal IRMAA after a life-changing event such as stopping work, but a Roth conversion is not an appealable event. And both spouses on Medicare pay the surcharge, doubling the cost of crossing a tier. Details are in our 2026 IRMAA guide.

A Roth conversion ladder for the early-retirement physician

A conversion ladder is a planned sequence of annual conversions across the gap years between a physician’s last paycheck and RMD age, each sized to that year’s bracket and IRMAA guardrails. For an early retiree it also solves access: converted principal can generally be withdrawn without the 10% penalty once its own 5-year clock runs, opening spendable money before 59 1/2.

Two separate 5-year rules apply. Each conversion carries its own clock for penalty-free withdrawal of converted principal before 59 1/2; a different 5-year rule governs tax-free earnings. A physician retiring at 54 who wants spendable Roth money at 59 needs the ladder started at 54, not 58.

An illustrative ladder for a physician couple, both born 1966, retiring at 60 with $2.6 million pre-tax, $70,000 of annual portfolio and consulting income, and RMDs due at 75:

The table is illustrative only, holds 2026 figures constant, and is not a projection, recommendation, or tax advice. Note the shape: the three pre-63 years carry the heavy conversions, then the ladder throttles down under the IRMAA line. Two execution rules hold regardless: pay the tax from taxable-account cash, never from the IRA, and treat each rung as irreversible (Source: IRS IRA FAQs). Converted dollars escape lifetime RMDs entirely, including designated Roth 403(b) accounts since 2024 (Source: IRS RMD FAQs; SECURE 2.0 sec. 325).

Physician tax planning strategies for high income: five cases where converting loses

A credible conversion plan names its own failure modes. These five fact patterns recur in physician households, and in each one a conversion, or at least a large one, is usually the wrong move for that year. Each is a modeling question, not a verdict: “convert more” is not a universal answer for high earners.

1. A peak 37% year with a no-tax state move ahead. A California or New York attending planning to retire to Florida, Texas, or Tennessee would pay top federal plus state rates now, versus federal-only rates after the move. The state layer alone can reverse the break-even.
2. No outside cash to pay the tax. IRA-paid tax reduces the amount converted, and for an owner under 59 1/2 the withheld portion can itself incur the 10% penalty. Without taxable savings for the bill, the transaction usually waits.
3. Age 63 or older with a one-time income spike. A conversion stacked on a practice-sale year can land the household in the top IRMAA tier, $689.90 per person per month for Part B in 2026 at $750,000+ joint MAGI (Source: SSA POMS HI 01101.020), with no SSA-44 appeal for conversion income.
4. Charitable intent covers the balance. A physician planning substantial giving at 70 1/2 and beyond can route up to $111,000 per year of IRA money directly to charity as QCDs in 2026 (Source: IRS Notice 2025-67); pre-paying conversion tax on dollars destined for charity is pure loss.
5. Low-bracket beneficiaries. If likely heirs are a lower-bracket surviving spouse, children, or a charity, inherited pre-tax dollars may be taxed below the physician’s conversion rate, weakening the estate argument.

How Rothology plans a Roth conversion for physicians

Rothology Premier Roth Conversion is Q3 Advisors’ flat-fee planning engagement for this decision. It is a fiduciary service with no products sold: the deliverable is a multi-year conversion plan with tax projections, plus annual reviews to resize each year’s conversion as income, law, and thresholds change. Typical clients hold $750,000 or more in pre-tax retirement assets.

For a physician household the engagement covers this page’s items in sequence: an inventory of 403(b), 457(b), 401(a), IRA, and solo 401(k) balances, with the 457(b)’s type and payout elections; a pro rata cleanup plan where old rollover IRAs block the backdoor; a career-arc map of conversion windows through RMD age; year-by-year sizing against bracket and IRMAA guardrails; and coordination with state residency timing, charitable intent, and beneficiary brackets. Every projection is a set of inspectable assumptions, not a promised outcome.

Frequently asked questions

How much should I convert each year without jumping into the next tax bracket?

The annual amount is the gap between projected taxable income and the top of the target bracket, recalculated yearly. Physicians with uneven locums or call income often finalize in December, since a conversion must be completed by December 31 and cannot be recharacterized (Source: IRS IRA FAQs). After age 63, IRMAA tiers add a second, cliff-edged guardrail.

What’s the difference between a backdoor Roth IRA and a Roth conversion?

A backdoor Roth IRA is a nondeductible IRA contribution of up to $7,500 in 2026 (Source: IRS Notice 2025-67) converted immediately, used because attending income exceeds the direct Roth limits. A Roth conversion moves existing pre-tax balances of any size, with no income limit, taxed as ordinary income (Source: IRS Pub. 590-A). Both are reported on Form 8606.

Should I pay the conversion tax from the IRA itself or from my taxable account?

Paying from taxable-account cash generally preserves the full converted amount inside the Roth. Paying from the IRA shrinks the conversion, and for a physician under 59 1/2 the withheld amount can be treated as an early distribution subject to the 10% penalty. Households without outside cash for the tax bill often defer or downsize the conversion year.

Does the 5-year rule apply separately to each Roth conversion if I retire before 59 1/2?

Yes. Each conversion starts its own 5-year clock before that converted principal can be withdrawn penalty-free by an owner under 59 1/2, which is why early-retiring physicians ladder conversions annually rather than converting once. A separate 5-year rule governs tax-free treatment of earnings. The clocks run concurrently, not consecutively.

Can I convert my 403(b) or 457(b) to a Roth IRA?

A 403(b) generally can be converted after separation from service, or earlier if the plan permits in-plan Roth conversion or in-service rollovers, with pre-tax amounts taxed as ordinary income (Source: IRS Pub. 590-A). Governmental 457(b) balances are broadly portable at separation. Non-governmental hospital 457(b) money follows its plan’s distribution schedule and is usually sequenced around the conversion ladder rather than into it.

Are Roth conversions still worth it now that tax rates are permanent?

Permanence removed the rate-sunset urgency, with the top rate staying at 37% (Source: IRS Rev. Proc. 2025-32), but the physician-specific drivers remain: RMD stacking from multi-million pre-tax balances, the 10-year rule for high-bracket heirs, IRMAA management, and state-residency arbitrage. Conversions are now personal rate arbitrage across a career arc, not a race against a statutory deadline.

Sources

• IRS Notice 2025-67 (2026 contribution limits, catch-ups, Roth IRA phase-outs, QCD limit)
• IRS Rev. Proc. 2025-32 (2026 rates and standard deduction)
• IRS Publication 590-A and IRS “Retirement plans FAQs regarding IRAs” (conversion taxation, Form 8606, recharacterization ban, deadline)
• IRS “Retirement plans FAQs on designated Roth accounts” (in-plan Roth rollovers)
• IRS multiple-plan deferral FAQ and IRS “Non-governmental 457(b) deferred compensation plans”
• IRS RMD FAQs; SECURE 2.0 Act secs. 107, 325, 603; Treasury/IRS final Roth catch-up regulations, September 2025
• SSA POMS HI 01101.020 and medicare.gov (2026 Part B premiums, IRMAA tiers, Part D amounts)