Health insurance premiums can reduce your adjusted gross income, but only through specific routes in the tax code. Employer premiums paid through a pre-tax payroll arrangement are excluded from your wages before AGI is ever calculated. Self-employed people can claim an above-the-line deduction that lowers AGI dollar for dollar. Premiums paid with after-tax dollars and claimed as itemized medical expenses, on the other hand, do not reduce AGI at all — they only chip away at taxable income further down the return.
Employer Coverage Paid Through Payroll
Most workers with job-based health coverage pay their share of premiums through a salary reduction arrangement under a Section 125 cafeteria plan.1Office of the Law Revision Counsel. 26 USC 125 – Cafeteria Plans Your employer subtracts the premium from your paycheck before calculating federal income tax, Social Security tax, and Medicare tax. Box 1 of your W-2 already reflects the reduced amount, so your AGI is lower automatically. You don’t file anything extra to make that happen.
To confirm your premiums are handled this way, check your pay stub for a line labeled as a pre-tax health insurance deduction. If your employer doesn’t offer a Section 125 plan and instead takes the premium after tax, the full wage is taxed first and your AGI is unaffected. In that case, the only remaining route is the itemized medical expense deduction described below, which does not reduce AGI either.
The Self-Employed Health Insurance Deduction
If you run your own business, you can deduct health insurance premiums directly from your total income. This is an above-the-line deduction that lowers AGI dollar for dollar. It covers medical, dental, and vision insurance, plus qualified long-term care insurance, for you, your spouse, your dependents, and any child of yours under age 27.2Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses You calculate it on Form 7206 and report the result on Schedule 1 (Form 1040), line 17.3Internal Revenue Service. Instructions for Form 7206
You qualify if you fall into one of these categories:
- A sole proprietor or single-member LLC with net profit on Schedule C or Schedule F.
- A partner with net earnings from self-employment reported on Schedule K-1 (Form 1065), box 14, code A.
- An S corporation shareholder who owned more than 2 percent of the stock and received W-2 wages from the company.
Two limits shape the deduction. It cannot exceed the net earned income of the business that established the plan, so it can’t create or enlarge a business loss.2Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses And you cannot take it for any month you were eligible to participate in a subsidized health plan through any employer — yours, your spouse’s, or a dependent’s — even if you declined to enroll. The deduction also lowers only your income tax, not your self-employment tax; you cannot subtract it when calculating net earnings for SE tax.3Internal Revenue Service. Instructions for Form 7206
S Corporation Shareholders
A more-than-2-percent S corporation shareholder has an extra step. The corporation must either pay your premiums directly or reimburse you during the same tax year, and it must report those premium amounts as wages in Box 1 of your W-2. They stay out of Boxes 3 and 5 because they are exempt from Social Security and Medicare taxes when paid under a plan covering a class of employees.4Internal Revenue Service. S Corporation Compensation and Medical Insurance Issues If the corporation doesn’t handle the premiums and W-2 reporting this way, the insurance is not considered established by the business, and the above-the-line deduction is disallowed.5Internal Revenue Service. Notice 2008-1 – Special Rules for Health Insurance Costs of 2-Percent Shareholder-Employees When it is handled correctly, the added W-2 wages and the deduction on Schedule 1 offset each other, and your AGI lands where it should.
Medicare Premiums Count Too
Self-employed individuals age 65 and older can include Medicare Part B, Part D, and Medigap premiums in this same deduction. The IRS treats voluntarily paid Medicare premiums the same as private health insurance premiums for this purpose.3Internal Revenue Service. Instructions for Form 7206 The usual conditions apply: you need net earned income from self-employment, and the deduction can’t exceed that income. Self-employed retirees who keep working often miss this.
HSA Contributions as a Related AGI Reduction
Health Savings Account contributions are a separate above-the-line deduction that lowers AGI, though HSA funds generally cannot be used to pay insurance premiums.6Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts You must be enrolled in a qualifying High Deductible Health Plan to contribute. Contributions go on Form 8889, and the deduction flows to Schedule 1.
For 2026, the contribution limit is $4,400 for self-only coverage and $8,750 for family coverage, with an additional $1,000 catch-up if you are 55 or older by year end.7Internal Revenue Service. Revenue Procedure 2025-19 Starting in 2026, the One, Big, Beautiful Bill Act expanded HSA eligibility: bronze and catastrophic health plans now count as HSA-compatible, and people in direct primary care arrangements can contribute to an HSA and use the funds tax-free to pay periodic care fees.8Internal Revenue Service. One, Big, Beautiful Bill Provisions
A few premium types are exceptions to the general rule against paying insurance with HSA funds. You can use the account to pay premiums during periods when you receive unemployment compensation, for COBRA continuation coverage, and, once you reach Medicare eligibility age, for most health insurance other than Medigap.6Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts
After-Tax Premiums and the Itemized Deduction
If you pay premiums with after-tax dollars and you’re not self-employed, your only option is to lump them in with your other medical expenses on Schedule A. Only the portion of total medical and dental expenses that exceeds 7.5% of your AGI qualifies.9Internal Revenue Service. 2025 Instructions for Schedule A (Form 1040)10Internal Revenue Service. Publication 502, Medical and Dental Expenses
This deduction does not reduce AGI. It applies below the line, after AGI has already been calculated, so it has no effect on income-based tests that use AGI or modified AGI as their threshold, including the Premium Tax Credit. It only reduces taxable income, which is a later step.
The practical value is limited further by the standard deduction. Itemizing only helps when medical expenses above the 7.5% floor, plus state and local taxes, mortgage interest, and charitable contributions, together exceed the standard deduction. For many taxpayers, the 7.5% floor absorbs most or all of the premium amount, and the standard deduction wins. Self-employed filers who cannot deduct all their premiums above the line because business income was too low can add the leftover amount to Schedule A, subject to the same 7.5% floor.10Internal Revenue Service. Publication 502, Medical and Dental Expenses
If You’re Trying to Qualify for Marketplace Subsidies
The Premium Tax Credit uses modified adjusted gross income, not AGI alone. MAGI starts with AGI and adds back foreign earned income excluded on Form 2555, tax-exempt interest, and nontaxable Social Security benefits.11Internal Revenue Service. Modified Adjusted Gross Income For most filers without those items, AGI and MAGI are the same, and every dollar of AGI reduction feeds directly into a larger credit. If you draw substantial Social Security or hold tax-exempt bonds, MAGI can sit well above AGI, and premium-related deductions won’t close that gap.12HealthCare.gov. What’s Included as Income
Self-employed marketplace enrollees who receive advance Premium Tax Credit payments face a circular calculation: the deduction lowers AGI, which raises the credit, which reduces the net premium and shrinks the deduction. The IRS provides two approved worksheets in Publication 974, a Simplified Calculation Method and an Iterative Calculation Method that repeats until both figures change by less than $1 between rounds.13Internal Revenue Service. Publication 974, Premium Tax Credit (PTC) Working through the correct worksheet at filing time is what keeps an over-claimed advance credit from turning into a repayment on your return.