Deducting Medical Expenses: The AGI Threshold and What Actually Counts

Every year someone sits down across from us in Weatherford after a rough medical year, adds up their doctor bills, and expects the whole pile to come off their taxes. It is one of the most understandable assumptions in the tax code, and one of the most disappointing to correct. Medical expenses can be deductible — but the way the deduction is built, most people never clear the bar, and the ones who do often miss expenses that would have counted. Here is how it actually works.

The threshold that trips everyone up

You cannot deduct your medical expenses starting from the first dollar. The deduction only applies to the portion of your qualified medical costs that exceeds a set percentage of your adjusted gross income, or AGI. Everything below that line is not deductible; only the amount above it counts.

That percentage is set by law, and it has moved over the years, so the exact figure for the current tax year is something to confirm before you file rather than assume. But the mechanic is what matters: the higher your income, the higher your dollar threshold, and the more you have to spend before any of it becomes deductible. A family with a modest income and a serious medical year is far more likely to clear the threshold than a high earner with the same bills.

A simple way to picture it

Say your AGI is a given number and the threshold is a percentage of it. Multiply the two and you get your floor. If your total qualified medical expenses for the year come to more than that floor, only the excess above it is deductible. If your expenses come in under the floor, you get no medical deduction at all that year. This is why a single expensive medical event — a surgery, a long hospital stay, a year of ongoing treatment — is usually what pushes someone over the line, not routine care.

You have to itemize

Here is the second gate. The medical expense deduction is an itemized deduction, which means you only benefit from it if you itemize instead of taking the standard deduction. For most people the standard deduction is larger than their total itemized deductions, so they take it and never touch the medical deduction at all.

That is not a failure — it usually means the standard deduction gave you a better result. But it does mean the medical deduction only comes into play in a year where your itemized deductions, medical and otherwise, add up to more than the standard deduction. If you have never worked through whether itemizing beats the standard deduction, our guide on the standard deduction versus itemizing walks through the decision.

What actually counts as a medical expense

The list of qualifying expenses is broader than most people expect. It generally covers costs you pay for the diagnosis, cure, treatment, or prevention of disease, and for treatments affecting the body. Commonly overlooked items include:

• Payments to doctors, dentists, surgeons, and other providers for care not covered by insurance.
• Prescription medications and insulin.
• Health insurance premiums you pay with after-tax dollars — though premiums already paid pre-tax through an employer generally do not count again.
• Long-term care and certain long-term care insurance, subject to limits.
• Mileage to and from medical appointments, at a rate the IRS sets for medical travel, plus parking and tolls.
• Eyeglasses, contact lenses, hearing aids, and certain medical equipment.
• Capital improvements to a home for medical reasons — a wheelchair ramp, for example — to the extent the cost exceeds any increase in the home's value.

Just as important is what does not count. Cosmetic procedures, general health items like vitamins or gym memberships taken for overall wellness, and most over-the-counter products bought without a prescription generally do not qualify. And you cannot double-dip: an expense you paid with pre-tax dollars from an HSA or a flexible spending account cannot also be deducted here, because you already got the tax benefit once.

Timing can make or break the deduction

Because the deduction hinges on clearing a percentage of your income in a single year, bunching matters. If you know a large medical expense is coming — an elective procedure, a course of treatment — concentrating deductible costs into one tax year rather than splitting them across two can be the difference between clearing the threshold and falling short. Paying an outstanding bill in December versus January can genuinely change the outcome. This is the kind of timing move we cover alongside others in our year-end tax moves checklist.

Keep the records

If there is any chance you will clear the threshold, keep everything: itemized bills, insurance statements showing what was and was not reimbursed, pharmacy printouts, and a mileage log for medical trips. Reimbursed amounts do not count, so you need records that show what you actually paid out of pocket. Reconstructing a year of medical expenses from memory in April rarely goes well.

What this means for your return

The medical expense deduction is real and occasionally very valuable, but it is gated twice — once by the AGI threshold and again by the requirement to itemize. In a normal year most people benefit from neither gate; in a heavy medical year, both can swing open at once, and that is exactly when you want a preparer looking at the numbers. The threshold percentage changes over time, so confirm the current-year figure rather than relying on what applied in a past year.

This article is general information, not tax advice. Whether the deduction helps you depends on your income, your total itemized deductions, and your specific expenses.

Had a heavy medical year and not sure if it changes your taxes? Call RD Precision Tax Service in Weatherford at (817) 480-6649, or request a free estimate. Robert has helped clients across Weatherford and Parker County since 2017.