The Year Her Mother Went Into Care, She Converted $180,000 of the IRA to a Roth, and the Nursing Home Bills Erased the Entire Tax

If you have a traditional IRA and someone in your household faces catastrophic nursing home bills, a tax interaction exists that most financial plans never account for. A Roth conversion executed in the same calendar year as enormous deductible medical costs can move IRA dollars into a Roth at a fraction of their normal tax cost. The mechanism is straightforward: the medical expense itemized deduction absorbs the taxable income the conversion generates. The strategy pairs two ordinary tools most people use separately, and it closes at year-end.

How the Mechanism Works

A Roth conversion moves money from a pre-tax traditional IRA into a Roth IRA, adding the converted dollars to your taxable income for that year. Qualified medical expenses, including long-term care and nursing home costs when the care is primarily medical, are deductible on Schedule A to the extent they exceed 7.5% of your adjusted gross income. In a year when someone spends twelve months in a skilled nursing facility, the eligible costs can be staggering. According to the CareScout 2025 Cost of Care Survey, the national median for a private nursing home room now runs $129,575 per year, and a semi-private room runs $114,975. Layer a large conversion into that same calendar year, and the deduction can absorb a substantial portion of the tax bill on that conversion.

Where the Rule Lives

The medical expense deduction and its AGI floor sit in Internal Revenue Code Section 213. What counts as a deductible medical expense, including nursing home care, is spelled out in IRS Publication 502. Publication 502 draws a hard line: if the resident is in the facility mainly to receive medical care, the full cost, including lodging and meals, counts as a medical expense. If the resident is there chiefly for personal or custodial reasons, such as help with bathing, dressing, and daily living rather than medical treatment, only the portion attributable to medical care qualifies. Custodial care alone generally does not clear the bar.

Who Can Actually Use This

Itemizing is required to benefit. The 2026 standard deduction is $32,200 for married couples filing jointly, $16,100 for single filers and married individuals filing separately, and $24,150 for heads of household under the One Big Beautiful Bill adjustments. If total itemized deductions do not exceed those thresholds, the medical deduction adds nothing. Retirees who default to the standard deduction routinely miss this entirely. One additional note for older readers: the One Big Beautiful Bill also created a temporary $6,000 senior bonus deduction for taxpayers 65 and older (or $12,000 for qualifying couples) for tax years 2025 through 2028, though it phases out above $75,000 of modified AGI for single filers and $150,000 for joint filers. Qualifying for that bonus raises the bar for itemizing to beat, so the math deserves a fresh look each year.

Whose bills and whose IRA are involved matters just as much. To deduct another person’s medical expenses, that person must be your spouse or a dependent, which can include a qualifying relative such as a parent under the multiple support rules. An adult child generally cannot deduct a parent’s nursing home costs unless that parent meets the dependent test. When the same person owns the IRA and incurs the medical bills, the strategy works directly. When the IRA belongs to the child and the bills belong to the parent, the strategy usually does not work at all.

How the $180,000 Offset Works in Practice

Here is how the numbers played out for “Sarah.” She covered $130,000 in qualifying medical costs for her mother, who spent the year in a skilled nursing facility. That cost is consistent with current national data: a private room at the CareScout 2025 median runs about $129,575 annually. By claiming her mother as an eligible dependent under the IRS multiple support rules, Sarah unlocked a deduction most people never know exists. On top of her baseline $70,000 salary, she executed a $180,000 traditional-to-Roth conversion, pushing her AGI to $250,000. The 7.5% AGI floor came to $18,750, leaving $111,250 in deductible medical expenses ($130,000 minus $18,750). Combined with SALT and other itemized deductions, she effectively neutralized the taxable surge from the conversion, and her IRA balance moved permanently into tax-free territory.

Running the Play in 2026

The 2026 brackets, per Revenue Procedure 2025-32, run 10%, 12%, 22%, 24%, 32%, 35%, and 37%, with the top rate applying to single incomes above $640,600 and joint incomes above $768,700. The execution sequence generally looks like this:

1. Estimate qualified medical costs for the year, including nursing home charges that meet the Publication 502 standard.
2. Project AGI without a conversion, then add the planned conversion amount. Apply the 7.5% floor to the new, higher AGI figure.
3. Size the conversion so that the deductible medical amount, plus other itemized items such as state and local taxes and charitable gifts, absorbs most of the taxable conversion income. Under the One Big Beautiful Bill, charitable deductions for itemizers now carry a 0.5% AGI floor, and those in the 37% bracket are limited to a 35% deduction rate, so high-income converters should factor this into the step-three sizing.
4. Complete the conversion at the custodian before December 31. Roth conversions cannot be recharacterized, and the year-end deadline is firm.
5. File Schedule A alongside Form 8606 for the conversion.

Traps to Price In

The AGI floor moves as you convert. Each dollar converted raises your AGI, which in turn raises the threshold your medical costs must clear before anything becomes deductible. The offset is not as clean as it looks on a spreadsheet.

The conversion also raises modified adjusted gross income (MAGI), and Medicare uses a two-year lookback for the income-related monthly adjustment amount (IRMAA). A 2026 conversion feeds 2028 Medicare premiums. For 2026, IRMAA begins at MAGI above $109,000 for individual filers and $218,000 for joint filers. The standard Part B premium is $202.90 per month in 2026, and the top IRMAA tier pushes the total Part B premium to $689.90 per month for individuals with MAGI at $500,000 or more and for joint filers at $750,000 or more.

Medicaid planning is a separate issue. A conversion turns a pre-tax asset into a Roth asset, but the balance remains countable in most states, and state transfer lookback rules still apply. A high-medical-cost year is one version of a low-tax conversion window. The more common version, the quiet years between the last paycheck and the first required minimum distribution, is covered in a free Roth conversion guide. Given the timing sensitivity and the interaction with IRMAA, dependency status, and Medicaid, a review with a CPA and an elder law attorney, wherever nursing home eligibility is in play, is typically warranted before execution.

Editor’s note: This revision adds current nursing home cost data from the CareScout 2025 Cost of Care Survey (national median of $114,975 to $129,575 per year, published March 2026), incorporates the 2026 standard Medicare Part B premium of $202.90 per month, and notes the One Big Beautiful Bill’s new 0.5% AGI floor on charitable deductions for itemizers and the temporary senior bonus deduction for taxpayers 65 and older.

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