A Roth conversion in a low-income year, like a gap between jobs or after a practice sale, can tax those dollars at a lower rate, and Annex Wealth Management counts every cost it triggers.
Converted dollars count as ordinary income only in the calendar year of the transfer. Medicare looks back two years, so a 2026 conversion can raise Part B premiums in 2028. In 2026, a single filer whose 2024 MAGI exceeded $109,000 pays $284.10 a month for Part B, compared with the standard $202.90.
Clients usually put it more plainly: “I finally have a low-pay year, so should I convert the whole old IRA before my next job starts?” Maybe, but a lower tax rate can be outweighed by a higher income-driven student loan payment, lost marketplace premium help, or Medicare IRMAA two years later.
Annex Wealth Management reviews the cash needed for the tax bill before recommending a fund sale or IRA move. The conversion is a tax decision first; the portfolio comes after the monthly spending plan.
By Marcus Thompson, CFA — Wealth Manager | Reviewed by Robert Kim, AIFMarcus builds diversified portfolios for high-net-worth clients, with deep expertise in asset allocation and risk management.
Step 1: Put the conversion on the right calendar
A Roth conversion is taxable as ordinary income in the calendar year the money moves. The deadline is December 31, with no April extension, and the IRS has not allowed conversion recharacterizations since 2018. Once the custodian processes it, the decision sticks.
The IRS adds every traditional, SEP, and SIMPLE IRA balance you hold on December 31 to calculate the taxable share of a conversion. That pro-rata calculation appears on IRS Form 8606. Money in a 403(b) or 457(b) does not enter that IRA total, which is why an old residency rollover IRA deserves attention.
Gather the final pay stub from the old employer, the new offer letter and start date, and the prior tax return. After a practice sale, add the closing statement. Installment payments, an earnout, or late collections can make a supposedly lean year much fatter than it first appears.
December 31 controls the tax year, but an IRA custodian may set an earlier processing cutoff. Ask for its date before assuming a late-December request will count.
- Final employer pay stub
- New-job offer letter
- IRA year-end statement
Step 2: Does an income-driven loan plan or Medicare change the math?
Yes. Under an income-driven plan, the payment typically climbs by about 10% of any added discretionary income, so a conversion may raise the next year's loan cost while you pursue PSLF. Medicare sets premiums from MAGI two years back.
A conversion in 2026 therefore shows up in 2028 premiums, which matters if you will be on Medicare by then, roughly age 63 or older at conversion. For scale, 2026 Part B goes from $202.90 to $284.10 a month once 2024 MAGI passed $109,000 single or $218,000 joint. Marketplace coverage can also lose premium tax credit dollars, and some states tax conversions.
Step 3: Put the rollover IRA choices beside each other
Three choices can look alike on a tax return but behave very differently in your cash flow. A full conversion clears the IRA for a later backdoor Roth contribution, but it creates the largest income spike. A partial conversion limits the size of the bill, not the tax rate on each converted dollar.
Leaving the IRA alone until PSLF forgiveness or retirement avoids a conversion-driven payment bump. If the new employer’s 403(b) accepts pre-tax IRA roll-ins, moving the rollover IRA there can remove the future pro-rata obstacle with no current taxable income. That is usually a cleaner move than forcing a conversion merely because a calendar year looks quiet.
Check the backdoor Roth effect
Use one rate for each dollar
Use this rule: if the income-driven payment percentage plus this year’s tax rate is at or above the tax rate you expect later, do not convert solely for the lower bracket.
| Choice | Tax rate now | Loan-payment effect | Cash needed |
|---|---|---|---|
| Convert all | Applied to all dollars | Largest increase | Tax due at filing |
| Convert a slice | Applied to converted dollars | Smaller increase | Partial tax bill |
| Roll into 403(b) | No current conversion tax | No conversion increase | No conversion tax |
- Convert the whole IRA
- Convert only a slice
- Roll into the new 403(b)
Step 4: Price Reena’s $60,000 conversion month by month
Reena (hypothetical) is 38, a hospital-employed anesthesiologist with a three-month gap between nonprofit jobs. Her spouse teaches public school, their two children are under age six, and Reena has about $310,000 in federal loans with four years left toward PSLF. She holds $520,000 across a 403(b) and 457(b), plus $60,000 of pre-tax money in a residency-era rollover IRA.
For illustration, assume converted dollars face a 24% federal rate this year and a 32% rate after PSLF forgiveness. Converting now costs $60,000 × 24% = $14,400. Waiting costs $60,000 × 32% = $19,200. The job-gap conversion appears to save $4,800.
But Reena’s income-driven payment is 10% of discretionary income. Adding $60,000 to AGI adds $60,000 × 10% = $6,000 to the next payment cycle, or $500 each month for 12 months after recertification. The $4,800 tax saving lasts 9.6 months: $4,800 ÷ $500 = 9.6. In month 10, the loan-payment cost passes the tax saving.
Converting the whole rollover IRA because the bracket looked low, without adding the income-driven payment bump, turns Reena's $4,800 tax saving into a $1,200 loss. Growth is ignored on both sides. Run your own bracket and loan payment percentage through our calculator before you call the custodian.
The table tracks the cost against the tax Reena would have paid later. If the assumed later tax rate changes, or her loan payment is lower than 10%, the crossover month changes too.
Put the tax bill in the spending plan
Why the roll-in wins for Reena
For Reena, rolling the IRA into her new 403(b), then reviewing a conversion after PSLF forgiveness, beats a gap-year conversion. Without the income-driven plan, she would keep the full $4,800 tax difference.
| Point in time | Running cost | Running benefit | Net |
|---|---|---|---|
| Return filed, tax paid | $14,400 | $19,200 | +$4,800 |
| Month 3 of higher payment | $15,900 | $19,200 | +$3,300 |
| Month 6 | $17,400 | $19,200 | +$1,800 |
| Month 10 | $19,400 | $19,200 | -$200 |
| Month 12 | $20,400 | $19,200 | -$1,200 |
Step 5: Get three answers before instructing a transfer
Ask the IRA custodian for its year-end processing cutoff, whether it can convert investments in kind, and whether it applies default tax withholding. A default 10% withholding is a warning light, and the safer route is to cover the bill from your checking or savings account. Withholding part of an IRA conversion before age 59½ can create a 10% penalty on the amount withheld.
Ask hospital HR whether the 403(b) accepts pre-tax IRA roll-ins. “Not accepted” removes the cleanest version of the roll-in choice. Then ask the loan servicer for the recertification date and the tax year it uses. Annex Wealth Management also asks for the plan’s answer in writing, because verbal benefits guidance has a short shelf life.
- Custodian processing cutoff
- 403(b) roll-in acceptance
- Loan recertification date
Step 6: Leave room for a late pay stub or market drop
You owe tax on the conversion-date value even if the Roth account drops the next week. A conversion cannot be undone, so splitting a planned amount into two or three tranches between October and December limits the amount tied to one day’s market price. Investments can fall after the tax is paid, and you may receive back less than you invested.
A delayed start date or December signing bonus can change the estimate fast. Rerun it in November using the newest pay stub, and leave enough room below the next expected rate for a $10,000 surprise. Annex Wealth Management treats that room as useful restraint, not unused tax capacity.
The IRS safe-harbor rule may matter when a conversion creates a large bill. For an AGI above $150,000, paying 110% of the prior year’s tax can avoid an underpayment penalty. Ask a tax professional how estimated payments fit your facts; this article is general education, not tax advice.
This page does not decide whether to remain on PSLF or refinance loans. It also assumes tax rates and ignores growth. A person who may need converted money before age 59½ should remember that each conversion has its own five-year clock for the 10% penalty.
Split a late-year conversion
Check the tax-payment rule
- Rerun numbers in November
- Keep cash for estimated tax
- Check each five-year clock
Where Annex Wealth Management starts: the spending plan and Form 8606
Our first question at Annex Wealth Management comes from the monthly spending plan: can the tax bill and any higher loan payment come from cash without drawing down the emergency reserve? Then we review the year-end IRA statement, the last IRS Form 8606 for after-tax basis, and the loan servicer's recertification date. A related Financial planning for doctors service can put this conversion beside practice cash flow and student debt, but it should not be used to manufacture a conversion.
A low tax bracket is not a bargain if the loan payment turns it into a loss.
Questions about a Roth conversion low income year
What happens if I convert in my gap year and tax rates fall later, did I just prepay the IRS for nothing?
My new hospital’s 403(b) accepts roll-ins from IRAs, should I move my old rollover IRA there instead of converting it?
Primary sources
This material is general information only and does not constitute investment, tax or legal advice tailored to your circumstances. Investing involves risk, including possible loss of principal. Before acting on any information here, speak with a financial advisor, tax professional or attorney about your specific situation.