4 — Medical Deduction Amount Updated for tax year 2025

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?

• You had total medical expenses (line 1) that exceeded 7.5% of your AGI (line 3)
• This is a calculation: subtract line 3 from line 1, with a floor of zero

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 [SOURCE: 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 [SOURCE: 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.

Related lines on your return

• Line 1 — Schedule A — Total medical and dental expenses
• Line 3 — Schedule A — The 7.5% AGI threshold you must exceed
• Line 17 — Schedule A — Total itemized deductions (where this amount flows)