How to use a backdoor Roth IRA for physicians without the pro-rata trap

Two brokerage clicks do not settle the tax

A $7,500 nondeductible contribution plus a $50,000 pre-tax rollover IRA gives $57,500. Only $7,500 ÷ $57,500, or about 13 percent, is tax-free. About 87 percent of the conversion is taxable.

The IRS pro-rata rule adds the December 31 balances of all your traditional, SEP and SIMPLE IRAs to the amount converted during the year. You cannot choose only the after-tax dollars and leave the pre-tax dollars behind. The calculation applies to one person at a time.

The two clicks are easy: contribute, then convert. The work is counting every pre-tax IRA in your name before the first click. Assante Wealth Management puts that count on the one-page plan before discussing a fund change. A $50,000 rollover IRA creates a different tax result than an empty IRA.

My income shut me out of Roth IRAs for good

For 2026, direct Roth IRA contributions phase out between $242,000 and $252,000 of MAGI for married couples filing jointly, and between $153,000 and $168,000 for single filers. Conversions have no income limit, which is why a high-earning hospital physician may still use this two-step route.

The IRS IRA contribution limit for 2026 is $7,500, or $8,600 at age 50 or older with the $1,100 catch-up. You need earned income at least equal to the contribution. A spouse at home can use the working spouse’s pay on a joint return.

The usual advice does not apply to every physician. An early attending or part-time reader whose MAGI falls under the phase-out can contribute directly to a Roth IRA. Someone fully retired with no earned income cannot contribute at all. Income and work status come first.

A spouse’s old IRA does not spoil my conversion

The pro-rata rule counts IRAs one person at a time. Your spouse’s traditional IRA does not enter your calculation, and neither do your inherited IRAs or your 401(k), 403(b), or cash balance plan. Only your own traditional, SEP and SIMPLE IRAs matter.

That includes a SEP-IRA opened for locums or moonlighting income. Assante Wealth Management asks for each spouse’s account list separately because a joint tax return does not turn two IRA owners into one calculation. A spouse’s clean balance cannot offset your pre-tax IRA.

Miriam’s $50,000 IRA changes the math

Hypothetical: Miriam, 58, is a divorced radiologist and partner in a private group. She has about $700,000 of taxable income, $2.4 million mostly in the group’s 401(k) and cash balance plan, and a $50,000 pre-tax rollover IRA from a fellowship-year job. She is choosing between retiring at 60, retiring at 62, or doing part-time reads.

Before the roll-in, Miriam contributes $8,600 nondeductible to a traditional IRA. That is $7,500 plus the $1,100 age-50 catch-up. She then converts the $8,600. The IRS adds her $50,000 December 31 IRA balance to the $8,600 converted: $50,000 + $8,600 = $58,600.

Her tax-free share is $8,600 ÷ $58,600 = about 14.7 percent. The taxable share is about 85.3 percent. In dollars, about $8,600 × 85.3 percent = roughly $7,340 taxable. At the 37 percent top federal rate above $640,600 for a single filer, $7,340 × 37 percent is about $2,716, or roughly $2,720.

Miriam rolls the $50,000 into her group’s 401(k) in October, after the plan confirms in writing that it accepts roll-ins. Her December 31 IRA balance is then zero. The $8,600 conversion is taxed only on interest earned before conversion, if any. Her retirement accounts also fall from three to two: the 401(k) and the cash balance plan.

Assante Wealth Management compares the 401(k) fund menu's costs with the IRA before suggesting the roll-in. The trade-off matters. A plan may have fewer funds, and money rolled into the 401(k) usually cannot come back out while she still works there. Miriam may retire at 60, leaving only two or three backdoor years. Those years are worth having, but they are too small a benefit to justify moving $50,000 into a plan with high fees.

Investments can lose value, so Miriam also leaves room for a bad market year, a health change, or a change in tax law. The roll-in removes one tax obstacle; it does not decide when she should retire or how much income she can safely draw.

A conversion I regret can always be reversed

Roth conversions can no longer be recharacterized, so a taxable conversion stays taxable. The roll-in is also hard to reverse: money moved into a group 401(k) usually cannot come back out until you leave the group.

Rolling the old IRA into the group 401(k) in January, after a conversion the previous March, feels responsible but misses the December 31 count. For Miriam, about $7,340 of the $8,600 conversion remains taxable, producing roughly $2,720 in federal tax.

Skipping Form 8606 risks a $50 penalty. Worse, it leaves no record of the $8,600 basis, which could be taxed again later. At 37 percent, $8,600 × 37 percent is about $3,182, or roughly $3,180. Opening a SEP-IRA for locums pay after starting backdoor Roths can quietly restart the pro-rata problem if that SEP has a December 31 balance.

Which income lines does the conversion touch?

The taxable share of a conversion is ordinary income in the conversion year. The IRS reports the calculation on Form 8606, while the custodian reports the distribution on Form 1099-R. A conversion itself is not subject to the 10 percent early-distribution penalty, although other tax rules can still matter.

Roth eligibility uses MAGI against the 2026 phase-outs, including $153,000 to $168,000 for single filers. A high-earning radiologist may be far above that range, which blocks a direct Roth contribution but does not block a conversion.

Medicare looks back two years for income-related premiums. The 2026 Part B premium is $202.90 per month up to single MAGI of $109,000, then $284.10 per month through $137,000. A taxable conversion in the year you turn 63 or later can push premiums higher, so Assante Wealth Management considers conversion size alongside retirement timing.

Can I check my own accounts before converting?

Yes. Use a six-line account check before contributing: list every IRA in your name, record its expected December 31 balance, confirm the workplace plan accepts roll-ins, find prior Forms 8606, verify earned income, and compare last year’s MAGI with the phase-out. The list catches the account people forget most often, an old SEP from locums work.

Follow the order carefully. Clear eligible pre-tax IRAs first, contribute after checking the limit, convert after the cash settles, and file Form 8606 with the return. If the plan will not accept the roll-in, pause and price the pro-rata tax instead of treating the backdoor as automatic.

The decision rule is practical: if you hold any pre-tax traditional, SEP or SIMPLE IRA and your workplace plan accepts roll-ins, move it into the plan before December 31 of the conversion year. If it will not, hold off until you have priced the taxable share.

• Every traditional, SEP and SIMPLE IRA in your name
• December 31 balance of each account
• Plan’s roll-in rules confirmed in writing
• Prior Forms 8606 and basis total
• Earned income covering the contribution
• Last year’s MAGI against the phase-out

Who usually brings it up at home?

The person who handles the tax return usually raises the backdoor Roth first. Often that is a spouse, or, for a single doctor like Miriam, the CPA in March when the 1099-R arrives. A plain sentence works at home: “We put $8,600 in, move it to Roth a week later, report it on one form, and keep no other IRA open.”

Assante Wealth Management keeps that explanation short because the account structure should be explainable to the people who may need to manage it during illness. The tax preparer still handles the return, and the physician decides whether the workplace plan’s investment choices justify the roll-in.

The December 31 balance Assante Wealth Management wants to see

Assante Wealth Management looks first at the December statement for every pre-tax IRA in your name and whether your 403(b) or 401(k) accepts roll-ins. It also checks whether past Forms 8606 show your basis. Results depend on your accounts and the law at the time.

From there, the plan stays short: one Roth IRA, one workplace plan, and a single line on the client's one-page plan showing when each year's contribution and conversion happen. Meetings take place remotely, over video or by phone, and the office is at 317 South Juniper Street, Philadelphia, PA 19147, United States.