Tax Deductions for Medical Home Modifications (IRS Pub 502)

The rule in one sentence

Under IRS Publication 502, you can deduct as a medical expense the cost of home modifications that are primarily for medical care — but only the portion that does not increase the value of the home. If a modification does increase the home's value, you deduct the cost minus that value increase. If the cost is less than the value increase, nothing is deductible.

What 'primarily for medical care' means

The IRS looks at whether the main purpose of the expense is medical care — diagnosis, cure, mitigation, treatment, or prevention of disease — or whether it is a general improvement that happens to help. The test is primary purpose, not whether the item also has a non-medical use. A grab bar installed because a doctor recommended it for fall prevention is primarily medical. A kitchen remodel that makes a kitchen nicer and also happens to lower a counter is harder to defend.

The value-increase subtraction

This is the part that trips people up. The IRS does not let you deduct the full cost of a modification that increases the home's market value. You subtract the value increase from the cost, and deduct only the difference.

The 7.5% floor and itemizing

Medical expenses are deductible only to the extent they exceed 7.5% of your adjusted gross income (AGI), and only if you itemize deductions on Schedule A rather than taking the standard deduction. After the 2017 tax law, the standard deduction is large, so many households do not itemize — which means the home modification deduction produces no tax benefit for them.

Bunch the modification expense with other medical costs — the year of a major surgery, dental work, or a lot of prescriptions — to get over the 7.5% floor in one year. If the modification alone does not clear the floor, it may be worth timing it with other medical spending.

Capital improvement vs medical expense

Some modifications are capital improvements — permanent additions like a residential elevator or a constructed ramp — rather than removable items like grab bars. For capital improvements, the value-increase subtraction applies, and the deductible portion is the cost minus the home value increase. For items that do not add value and are removable (grab bars, a threshold ramp, a raised toilet seat), the full cost is generally deductible as a medical expense.

What is not deductible

• General home improvements that are not primarily for medical care — a remodel you wanted anyway that happens to be more accessible.
• Any portion of a cost that increases the home's value, once the value increase equals or exceeds the cost.
• Modifications for a family member who is not your dependent (unless they qualify as your dependent for the tax year).
• The amount below the 7.5%-of-AGI floor.
• Anything if you take the standard deduction and do not itemize.

Records to keep

1. The doctor's written recommendation, dated, stating the medical need.
2. Receipts and invoices for the modification, including labor and materials.
3. If the item adds home value, an appraisal or comparable-sale evidence of the value increase.
4. Proof you paid — canceled check, credit-card statement, or contractor receipt marked paid.
5. Keep these for at least three years after you file the return that claims the deduction.

State credits and programs

A few states offer tax credits or exemptions for accessibility modifications that the federal deduction does not cover — for example, property-tax exemptions for disabled veterans or accessibility-improvement credits in certain states. These change yearly, so check your state department of revenue or ask a local CPA what applies to your address. State programs sometimes have income limits or require pre-approval that the federal deduction does not.

This is general information, not tax advice. The rules are fact-specific and the IRS scrutinizes medical-expense claims that border on general home improvement. Talk to a CPA or enrolled agent about your situation before claiming a deduction.