A Roth conversion medical expense deduction strategy pairs a large itemized medical or long-term-care deduction with a Roth conversion in the same calendar year, so the deduction absorbs the taxable income the conversion creates. When care costs run well above 7.5% of your adjusted gross income (IRC Section 213), the deduction can shelter conversion dollars that would otherwise be taxed at ordinary rates.
A high-medical-expense year can be among the more tax-efficient years to run a Roth conversion. The conversion adds ordinary income to your AGI, and a large Schedule A medical deduction (costs above 7.5% of AGI) offsets much of it. Because each converted dollar also raises the 7.5% floor, the optimal conversion size is a solvable equation, not simply “convert up to the deduction.”
Why a big medical-expense year is a strong year to convert
A year with unusually high medical or long-term-care costs creates a large itemized deduction that sits mostly unused when ordinary income is low. Adding a Roth conversion in that same year manufactures the income the deduction can offset. Many retirees have this mismatch: a spouse enters memory care or a continuing care retirement community (CCRC), producing a six-figure deductible cost, while taxable income that year is modest.
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How a Roth conversion and a medical deduction cancel each other out
A Roth conversion is taxable ordinary income reported on Form 1040 and flows into AGI. A deductible medical expense is a subtraction on Schedule A. When both land in the same tax year, the deduction cuts taxable income by the same measure the conversion raised it, so you can move traditional IRA money to a Roth at little or no federal tax and owe nothing on future qualified Roth withdrawals.
The one rule that makes it work: costs over 7.5% of your AGI (IRC Section 213)
Under IRC Section 213, you may deduct unreimbursed medical expenses only to the extent they exceed 7.5% of your adjusted gross income, a floor that is permanent under current law. If your AGI is $130,000, the first $9,750 of medical cost is not deductible and only the excess counts. That floor is why the strategy needs sizing rather than guesswork: the conversion itself changes your AGI.
Does a Roth conversion count as income for the medical deduction? (the catch nobody solves)
Yes. A Roth conversion counts as income and raises your AGI, which raises the 7.5% medical floor. Each converted dollar lifts the floor by 7.5 cents, so it shaves 7.5 cents off your deductible medical expense. Converting more shelters more income but slightly shrinks the deduction, so there is a specific conversion amount that nets to zero federal tax.
Why each dollar you convert raises the 7.5% floor
Because the conversion is part of AGI and the medical floor is 7.5% of AGI, the two move together. Convert $100,000 more and AGI rises $100,000, lifting the nondeductible floor by $7,500 and cutting your medical deduction by that same $7,500. Most articles flag this as a warning and stop; it is actually a fixed relationship you can solve.
How big should the conversion actually be? (the math when the floor keeps moving)
To find the conversion that leaves taxable income at zero, let B be your other AGI before converting, M your total medical cost, and O your other itemized deductions (state and local taxes, mortgage interest, charitable gifts). The conversion C that zeroes out taxable income is:
C = (O + M) / 1.075 minus B
The 1.075 divisor accounts for the moving floor. The table below iterates for a single filer with $130,000 of deductible care cost, $10,000 of other itemized deductions, and $20,000 of other income.
| Step | Convert | AGI (B + C) | 7.5% floor | Medical deduction | Total itemized | Taxable income |
|---|---|---|---|---|---|---|
| Guess “up to the deduction” | $130,000 | $150,000 | $11,250 | $118,750 | $128,750 | $21,250 |
| Solved amount | $110,000 | $130,000 | $9,750 | $120,250 | $130,250 | near $0 |
Converting the full $130,000 leaves $21,250 exposed to tax; the solved figure, about $110,000, nets to roughly zero. Our how much to convert to Roth analysis walks through sizing in more depth.
Do you actually beat the standard deduction? (the hurdle first)
The medical deduction only shelters conversion income to the extent your total itemized deductions exceed the standard deduction. In 2026 that is $16,100 single and $32,200 married filing jointly, and you get it for free. Any itemized amount below that hurdle shelters nothing extra, so part of your medical expense is spent clearing the standard deduction before a single conversion dollar is sheltered.
How much medical expense you need before the strategy pays off in 2026
Deducting medical costs requires itemizing on Schedule A, which means giving up the standard deduction. So the income actually sheltered equals total itemized deductions minus the standard deduction, not the full medical deduction. Here are the 2026 hurdles to clear:
| Filing status (2026) | Base standard deduction | Extra if age 65+ |
|---|---|---|
| Single | $16,100 | +$2,050 |
| Head of household | $24,150 | +$2,050 |
| Married filing jointly | $32,200 | +$1,650 per spouse |
Example: a single 65-year-old with $10,000 of other itemized deductions has an $18,150 standard deduction (with the age add-on), so her first $8,150 of medical deduction merely matches what she would get for free. Only deduction above that point shelters conversion income net. Rule of thumb: the play tends to pay off when medical cost comfortably exceeds your 7.5% floor plus the gap between the standard deduction and your other itemized deductions.
Worked example: $130,000 in care costs against a $180,000 conversion
Sarah, age 68, single, lives in a CCRC. Her deductible 2026 care cost is $130,000, with $10,000 of other itemized deductions and $20,000 of other taxable income. She holds $600,000 in a traditional IRA and wants to move as much as possible to a Roth while the deduction is available.
| Line item | Convert $110,000 (solved) | Convert full $180,000 |
|---|---|---|
| Other income (B) | $20,000 | $20,000 |
| Roth conversion (C) | $110,000 | $180,000 |
| AGI | $130,000 | $200,000 |
| 7.5% medical floor | $9,750 | $15,000 |
| Medical deduction | $120,250 | $115,000 |
| Other itemized | $10,000 | $10,000 |
| Total itemized | $130,250 | $125,000 |
| Taxable income | near $0 | $75,000 |
| Approx. federal tax | about $0 | about $11,212 |
At the solved $110,000, Sarah converts roughly tax-free. Pushing to $180,000, the extra $70,000 falls into the 10%, 12%, and 22% brackets (2026 single: 10% to $12,400, 12% to $50,400, 22% above), producing about $11,212 of tax, an effective rate near 6% on the whole conversion. Whether to stop at zero or pay a modest rate to move more depends on her future brackets and RMDs, which our Roth conversion break-even framework helps weigh.
The married version: a couple, both 68, one spouse in memory care, with $130,000 of deductible cost, $18,000 of other itemized deductions, and $40,000 of other income. A $180,000 conversion produces AGI of $220,000, a $16,500 floor, a $113,500 medical deduction, and $88,500 taxable income, which sits inside the 12% MFJ bracket (10% to $24,800, 12% to $100,800) for about $10,124 of tax, near 5.6% on the conversion.
Who can use this, and who can’t
You can deduct medical costs only for yourself, your spouse, or a qualifying dependent, and only when the care is primarily medical rather than custodial (IRS Publication 502). An adult child generally cannot deduct a parent’s care costs unless the parent meets the dependent test. The person running the Roth conversion must be the same taxpayer whose return carries the medical deduction.
Can I deduct my parent’s nursing home costs? (the dependent test)
Generally no, unless your parent qualifies as your dependent. The IRS “qualifying relative” test requires that you provide more than half of the parent’s support and that the parent’s gross income (excluding most Social Security) falls under the annual limit. If your parent’s own income and IRA fund their care, they, not you, take the deduction and would run the conversion on their return. Many families structure the conversion on the parent’s return for this reason.
Medical vs. custodial care: what actually counts (IRS Publication 502)
Only care that is primarily medical is deductible. Under IRS Publication 502, nursing-home meals and lodging are deductible only if the person is there chiefly for medical care. Purely custodial help (daily-living assistance where medical care is not the principal reason for the stay) is generally not deductible. Skilled nursing, memory care tied to a diagnosis, and physician-directed services usually qualify; a residence chosen mainly for convenience usually does not.
Long-term care, assisted living, and CCRC entrance fees
Long-term-care costs are a common source of the large deduction. Assisted-living fees are deductible when the resident is chronically ill and following a plan of care prescribed by a licensed practitioner. A portion of a CCRC or life-care entrance fee attributable to future medical care can also be deductible in the year paid, and the community typically supplies that percentage. These lump-sum entry fees create the single high-deduction year worth targeting.
How to run the play before December 31
Complete the Roth conversion and incur the medical cost in the same calendar year, then itemize on Schedule A and report the conversion on Form 8606. A Roth conversion cannot be reversed or recharacterized, and the December 31 deadline is firm, so size it before you execute. You cannot convert a required minimum distribution, so satisfy any RMD first.
Sizing the conversion and completing it at the custodian (no recharacterization)
Sizing comes first, then execution at your custodian. Confirm the deductible medical total, solve for the conversion with the formula, and only then move the money, because a conversion can no longer be reversed or recharacterized after 2017. If you are subject to RMDs, take the distribution before converting, since an RMD is not eligible for conversion. The steps below put that order in place.
- Confirm your deductible medical total and your other itemized deductions for the year.
- If you are age 73 or older, take your required minimum distribution first, since an RMD cannot be converted (see our 2026 RMD guide).
- Solve for the conversion size with C = (O + M) / 1.075 minus B, then decide whether to stop at zero tax or fill low brackets.
- Instruct your custodian to move that amount from the traditional IRA to the Roth IRA; the conversion is irreversible, so verify the figure first.
- Complete the transfer by December 31, 2026. Missing the year-end deadline pushes the income into a year without the offsetting deduction.
Reporting it: Schedule A + Form 8606
Two forms carry the strategy. The medical deduction goes on Schedule A, which requires itemizing rather than taking the standard deduction. The conversion goes on Form 8606, which tracks the taxable amount moved to the Roth. Because the pre-2018 recharacterization option no longer exists, the Form 8606 figure is locked once the year closes; there is no do-over if you overshoot.
The traps to price in
The main traps are IRMAA Medicare surcharges, state income tax, Medicaid eligibility, and the taxation of Social Security. A large conversion raises your AGI even when federal tax nets to zero, and several of these effects key off AGI or MAGI, not off your final tax bill. Model them before you convert, because the deduction does not undo them.
Will this raise my Medicare premiums? (IRMAA’s two-year lookback into 2028)
It can. Medicare uses a two-year lookback, so your 2026 MAGI sets your 2028 Part B and Part D premiums. The income-related monthly adjustment amount (IRMAA) begins above $109,000 MAGI single and $218,000 joint in 2026. A large conversion can push filers past those thresholds, adding surcharges on top of the 2026 base Part B premium of $202.90 per month. IRMAA keys off MAGI, which does not subtract the medical deduction.
| 2026 MAGI (single) | 2026 MAGI (joint) | Effect on 2028 Medicare |
|---|---|---|
| $109,000 or less | $218,000 or less | Base Part B premium, no surcharge |
| Above $109,000 | Above $218,000 | IRMAA surcharge applies (tiered by income) |
Medicaid, state taxes, and other second-order effects
A conversion can work against long-term-care Medicaid eligibility, since it raises countable income and, once inside the Roth, remains a countable asset. Most states tax conversion income and many do not mirror the medical deduction, so a federally zero-tax conversion can still trigger a state bill. The higher AGI can also pull other investment income above the 3.8% NIIT threshold and raise the taxable share of Social Security.
A planned version: forecasting your high-deduction year in advance
A proactive approach often gives more control than a reactive one. If you can foresee a high-deduction year, such as a scheduled CCRC entrance fee or a spouse’s planned move to memory care, you can pre-position the conversion for that same tax year rather than reacting after the bills arrive. Forecasting the deduction lets you time the conversion deliberately instead of discovering it at tax time.
Many care transitions are foreseeable months or years ahead. A CCRC contract with a known entrance fee, a progressive diagnosis pointing toward memory care, or a planned surgery with large out-of-pocket costs all give a target year. Mapping the expected deductible amount ahead of time lets you decide whether to accelerate or delay other income, hold the conversion for that window, and coordinate it with your RMD timing. What qualifies is detailed in our 2026 medical expense deduction guide.
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Q3 Advisors is a registered investment adviser focused on retirement tax planning. This page is educational and is not advice; consult a qualified professional.
Frequently asked questions
Can medical expenses offset a Roth conversion?
Yes. Medical expenses above 7.5% of your adjusted gross income are an itemized Schedule A deduction, and that deduction reduces the taxable income a Roth conversion creates when both fall in the same calendar year. A large enough medical deduction can offset most or all of a conversion, moving traditional IRA dollars to a Roth at little or no federal tax.
Are IRA conversions treated as part of the income used to calculate medical deductions on Schedule A?
Yes. A Roth conversion is included in adjusted gross income, and the Schedule A medical deduction is measured against 7.5% of AGI. Converting therefore raises the AGI that sets the floor, lifting the nondeductible amount by 7.5 cents per converted dollar. That is why the optimal conversion size is a calculation, not simply matching the deduction.
Does a Roth conversion count as income for the medical expense deduction?
Yes. A Roth conversion is taxable ordinary income and part of your AGI, the figure the 7.5% medical floor is measured against. Converting more raises AGI and slightly raises the floor, reducing your medical deduction by 7.5 cents per converted dollar. The conversion income and the deduction interact, so plan them together in one year.
Are nursing home costs tax deductible?
Nursing-home costs are deductible when the person is there primarily for medical care, under IRS Publication 502, in which case meals and lodging count along with nursing services. If the stay is primarily custodial, only the specifically medical portion is deductible. Deductible amounts must still exceed 7.5% of AGI and require itemizing on Schedule A.
Can I deduct my parent’s nursing home costs on my taxes?
Generally only if your parent qualifies as your dependent: you provide more than half of their support and their gross income (usually excluding Social Security) is under the annual limit. If your parent’s own income funds their care, the deduction and any paired Roth conversion belong on the parent’s return, not yours. Many families run the conversion on the parent’s return for that reason.
How much of long-term care or assisted living is deductible?
Assisted-living and long-term-care costs are deductible when the resident is chronically ill and following a plan of care prescribed by a licensed practitioner. Qualified long-term-care services and the medical portion of fees count; the custodial share generally does not. For a CCRC, part of the entrance fee attributable to future medical care can be deductible in the year paid.
Do you have to itemize to deduct medical expenses?
Yes. Medical expenses are deductible only if you itemize on Schedule A, giving up the 2026 standard deduction of $16,100 single or $32,200 married filing jointly. Because the standard deduction is free, the medical deduction shelters conversion income only to the extent total itemized deductions exceed it. If your itemized total is below the standard deduction, itemizing does not help.
Will a Roth conversion raise my Medicare premiums?
It can. Medicare uses a two-year lookback, so 2026 MAGI sets 2028 Part B and Part D premiums. IRMAA surcharges begin above $109,000 MAGI single and $218,000 joint in 2026. Because IRMAA looks at MAGI and does not subtract the medical deduction, a surcharge can apply even in a year the conversion nets to zero federal income tax.
