A single hospital stay can leave a family staring at five figures in bills. Whether any of that money helps at tax time comes down to one number: 7.5 percent of your adjusted gross income. Spend less than that on medical care in a year and the deduction is worth nothing to you. Spend more, and every dollar above the line can shrink your taxable income.
That threshold, often called the AGI floor, is the least understood part of the medical expense deduction. This piece walks through how the floor works, why most filers never clear it, which expenses count under the IRS rules, and how to claim the deduction if you qualify.
How the 7.5 percent floor works
The rule itself is short. If you itemize deductions, you can deduct the portion of your unreimbursed medical and dental expenses that exceeds 7.5 percent of your adjusted gross income, as the IRS explains in Tax Topic 502. Adjusted gross income is the figure at the bottom of the first page of your Form 1040, after certain adjustments but before deductions.
Run the math with a concrete case. A household with $60,000 of adjusted gross income has a floor of $4,500. If that household paid $10,000 in qualifying medical costs during the year, only the amount above the floor, $5,500, is deductible. The first $4,500 does nothing. A household with the same bills but $140,000 of income would clear a $10,500 floor by exactly nothing and get no deduction at all.
The bigger hurdle: you have to itemize
Clearing the floor is only half the test. The medical deduction lives on Schedule A, which means you claim it only if your total itemized deductions beat the standard deduction. For tax year 2026, the IRS set the standard deduction at $16,100 for single filers and $32,200 for married couples filing jointly, with heads of household at $24,150.
Those are high bars. Unless your medical costs above the floor, plus your state and local taxes, mortgage interest, and charitable gifts, add up to more than your standard deduction, itemizing loses. In practice, the medical deduction tends to matter most in years when something big happens: a surgery, a long hospitalization, the start of long-term care, or a year of reduced income that lowers the floor.
What counts as a medical expense
The IRS definition is broader than many people assume. Publication 502 lists the qualifying categories, which include payments to doctors, dentists, surgeons, chiropractors, psychiatrists, and psychologists; hospital and nursing home care that is primarily medical; prescription drugs and insulin; and equipment such as eyeglasses, contact lenses, hearing aids, dentures, crutches, and wheelchairs.
Some entries surprise people. Premiums you pay out of pocket for medical insurance, including certain long-term care policies within age-based limits, can count. So can transportation that is primarily for and essential to medical care, whether that is bus fare, parking at the hospital, or mileage in your own car. Home modifications made for medical reasons, such as a wheelchair ramp or widened doorways, may qualify to the extent they do not increase the value of the home.
What never counts
The exclusions matter just as much. You cannot deduct cosmetic surgery that is not medically necessary, over-the-counter medicines other than insulin, general health items such as vitamins or gym memberships, or anything an insurer, employer, or government program reimbursed. Funeral costs and most nonprescription supplements are also out.
Reimbursement is the trap that catches careful record keepers. If you paid a bill with money from a health savings account or a flexible spending arrangement, that expense is already tax-favored and cannot be deducted a second time. Only genuinely out-of-pocket, after-tax spending goes into the calculation.
Timing: the year you pay is the year that counts
The deduction follows your payments, not your treatment dates. An operation in December that you pay off in January belongs to the January tax year. That creates a modest planning opening. If you are close to the floor late in the year, paying an outstanding bill, filling prescriptions, or scheduling dental work before December 31 can push you over. If you have already cleared the floor this year, accelerating next year’s known expenses into this year concentrates the deduction where it will actually count.
Keep the paper. You will want receipts, statements from providers, insurance explanations of benefits showing what was not covered, and a mileage log if you claim medical travel. The IRS does not require you to file the records with your return, but you need them if questions come later.
How to claim it
The mechanics are straightforward. Total your qualifying expenses, subtract reimbursements, and enter the figures on Schedule A of Form 1040, which walks you through the 7.5 percent subtraction. Tax software does the arithmetic automatically once you enter your expenses and income.
One last point for households helping older relatives. If you pay medical bills for a parent who qualifies as your dependent, or who would qualify except for the income test, those payments can generally be added to your own expense total. For families covering assisted living or heavy prescription costs for a parent, that rule is sometimes the difference between a deduction that exists on paper and one that shows up in a refund. Publication 502 covers the dependent rules in detail, and it is worth reading before you assume a bill does not count.
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