You can deduct medical mileage for a parent if you provide more than half of that parent’s support for the year, the driving is for essential medical care, and your family’s total qualifying medical expenses clear 7.5% of your adjusted gross income on an itemized return. For 2026 the rate is 20.5 cents per mile.1Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile The part most people get wrong is thinking their parent has to qualify as a dependent in the usual sense. They don’t.
Your Parent Doesn’t Have to Be Your Dependent
Federal tax law lets you deduct medical expenses you paid for a person who would be your dependent except that the person’s gross income is too high or the person filed a joint return.2Office of the Law Revision Counsel. 26 USC 213 – Medical, Dental, Etc., Expenses The statute waives the gross income test specifically for medical expenses.
That matters because the 2026 gross income threshold for a qualifying relative is $5,300.3Internal Revenue Service. Revenue Procedure 2025-32 A parent with a small pension, investment income, or taxable Social Security usually blows past that number. They can’t be claimed as your dependent for most purposes, but their medical bills, and the miles you drive for their care, are still on the table for you.
The relationship test is automatic for a parent. What you actually have to prove is support.
Passing the Support Test
You need to provide more than half of your parent’s total support during the calendar year.4Office of the Law Revision Counsel. 26 USC 152 – Dependent Defined Total support means the full cost of housing, food, utilities, clothing, transportation, and medical care, no matter who pays it. If your parent lives with you, the fair rental value of the space they occupy counts toward total support, which often makes the math easier because it enlarges the total your own contributions are measured against.
The Social Security trap is where families miscalculate. Benefits your parent spends on their own living expenses count as support your parent provided for themselves. If your mother receives $24,000 a year in Social Security and spends it on groceries, clothes, and utilities, that $24,000 sits on her side of the ledger. You have to spend more than she does, plus more than anyone else contributes, to clear the 50% mark.
Keep receipts, canceled checks, and bank statements throughout the year. If the IRS challenges the deduction, you carry the burden of proving the ratio.
When Siblings Split the Cost
If no single sibling covers more than half of a parent’s support, nobody passes the test alone. A multiple support agreement fixes that. When two or more people together provide over half of the parent’s support, one of them can claim the parent for medical expense purposes, provided that person individually contributed at least 10%.5Internal Revenue Service. Publication 502 – Medical and Dental Expenses Every other contributor who paid at least 10% has to sign a statement waiving their claim, and the sibling who claims the parent attaches Form 2120 to the return. Only one sibling claims per year, but the family can rotate.
One catch trips people up: you can only deduct medical costs you personally paid. If three siblings split a parent’s medical bills equally, the claiming sibling deducts only their own third. A workaround some families use is to have one sibling pay all the medical bills while the others cover rent, groceries, and utilities.
Which Drives Actually Count
The trip has to be primarily for and essential to medical care. Driving your parent to a doctor’s appointment, a hospital, the pharmacy, lab work, or physical therapy all qualify. So does transportation for regular visits to see a mentally ill parent when a doctor recommends those visits as part of treatment.5Internal Revenue Service. Publication 502 – Medical and Dental Expenses
What doesn’t count: general health outings, and detours for personal errands. If you drive your parent to the cardiologist and then stop at the grocery store, the miles to the cardiologist still qualify, but you can’t add on the grocery leg. When your parent can’t travel alone and you drive them, your transportation is a medical expense too.
Calculating the Mileage Deduction
You have two ways to figure the number:
- Standard mileage rate. Multiply qualifying miles by $0.205 for 2026. This is the simpler method and the one the IRS is least likely to second-guess if your log holds up.
- Actual expenses. Track the real cost of gas and oil for each medical trip. You cannot include depreciation, insurance, or general maintenance under this method.
Pick one method for the year. The medical rate is far below the business rate because it covers operating costs only, not depreciation or insurance.
Parking fees and tolls are deductible on top of either method.5Internal Revenue Service. Publication 502 – Medical and Dental Expenses Hospital parking runs up quickly for a parent with frequent appointments, so save those receipts.
The Mileage Log
Without a log, the deduction dies. For every trip, record the date, the starting and ending locations, the purpose, and the miles driven. “Medical” scribbled next to a date won’t survive review. An entry that works looks more like: “March 14, 2026 — Home to Dr. Chen’s office for mother’s cardiology follow-up — 22 miles round trip.”
A GPS-based mileage app is the strongest evidence because it records routes and timestamps automatically. Paper logs work, but fill them in as trips happen. A notebook reconstructed the week before you file is exactly the kind of record that collapses under audit. The IRS expects contemporaneous entries.
The 7.5% AGI Floor
Medical expenses are only deductible to the extent they exceed 7.5% of your AGI.6Internal Revenue Service. Topic No. 502, Medical and Dental Expenses With an AGI of $100,000, the first $7,500 of medical costs gets you nothing. Only the excess counts.
The threshold applies to all qualifying medical expenses combined, not mileage alone. Your parent’s bills, your own prescriptions, dental and vision care, and health insurance premiums paid with after-tax dollars all pool together. Mileage on its own rarely clears the floor, but added to a parent’s real medical costs, it often pushes the total over.
Clearing the floor only helps if you itemize. For 2026 the standard deduction climbed again,7Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 so your itemized total, including medical, state and local taxes, mortgage interest, and charitable gifts, has to beat that number or itemizing costs you money. This is where most people’s medical mileage plans quietly fall apart. If you’re already close to the itemizing line for other reasons, a parent’s medical mileage can be the piece that tips it.
Insurance Reimbursements Shrink the Pool
Only unreimbursed expenses count. If your parent’s insurance or Medicare pays back part of a bill during the tax year, subtract that from your total before you calculate the deduction.5Internal Revenue Service. Publication 502 – Medical and Dental Expenses Mileage itself is almost never reimbursed, but the reimbursement rule still matters because it shrinks the surrounding pool of expenses you rely on to clear the 7.5% floor.
Lodging for Out-of-Town Treatment
If your parent needs care far from home, lodging is deductible up to $50 per night, and if you have to travel with a parent who can’t travel alone, your own lodging qualifies at the same $50 rate.5Internal Revenue Service. Publication 502 – Medical and Dental Expenses The stay has to be primarily for medical care, near a licensed hospital or medical facility, and not lavish. Meals are never deductible. It’s a common companion to the mileage deduction when a parent needs specialized treatment away from home.
How to Claim It
The deduction goes on Schedule A of Form 1040.8Internal Revenue Service. Schedule A (Form 1040) – Itemized Deductions Enter your total qualifying medical expenses, apply the 7.5% floor, and the remainder is the deductible amount. Your parent’s medical mileage combines with every other qualifying medical expense on the same line; there’s no separate slot for miles. Hold onto your mileage log, support calculations, and receipts with your return for at least three years, which is the ordinary audit window.