What this line means
The deductible portion of your medical and dental expenses — line 1 minus line 3. If line 3 is greater than line 1, enter zero. This amount flows into your total itemized deductions on line 17. Only the expenses above the 7.5% AGI floor produce a tax benefit.
Does this apply to you?
Easy to overlook
A large medical deduction can make itemizing worthwhile even without mortgage interest The standard deduction for 2025 is $15,750 (single) or $31,500 (married filing jointly). If your medical deduction alone pushes your total itemized deductions above the standard deduction, you benefit from itemizing. A single year with major surgery, cancer treatment, or dental implants can make itemizing the clear choice. 1 General filing pattern — medical deduction interaction with standard deduction
Self-employed health insurance premiums go elsewhere If you are self-employed, your health insurance premiums are deducted on Schedule 1 line 17 as an adjustment to income, not on Schedule A. The Schedule 1 deduction is better because it reduces AGI directly and does not require exceeding the 7.5% floor. Only include premiums here if you are not eligible for the self-employed health insurance deduction. 2 IRS Schedule A instructions — Line 4
Watch out for this
Double-deducting self-employed health insurance premiums on both Schedule 1 and Schedule A. You can only deduct these premiums in one place. If you took the self-employed health insurance deduction on Schedule 1, do not also include those same premiums in your Schedule A medical expenses.
Footnotes
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IRS Schedule A (Form 1040) Instructions. See also IRS Publication 17, Your Federal Income Tax. https://www.irs.gov/pub/irs-pdf/p17.pdf ↩
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IRS Schedule A (Form 1040) Instructions, Line 4. https://www.irs.gov/instructions/i1040sca ↩