The Self-Employed Health Insurance Deduction (Schedule 1, Line 17)

One of the largest deductions a freelancer can take does not live on Schedule C at all. It lives on Schedule 1, line 17, as an above-the-line adjustment to income. The Self-Employed Health Insurance deduction (often abbreviated SEHI) lets you deduct 100% of the premiums you pay for health, dental and qualified long-term-care insurance for yourself, your spouse, and your dependents. At $700/month for a family of three, that is $8,400 a year of pre-tax money — worth roughly $1,800–2,500 in real federal income tax saved.

The mechanics

The deduction is taken on Schedule 1 line 17 (which feeds into your 1040 line 10 as an "adjustment to income"). It reduces your AGI. A lower AGI means:

Lower federal income tax (the most direct effect).
Lower state income tax in most states (state AGI usually starts from federal).
Possibly larger ACA premium tax credit (more on that below).
Possibly more eligibility for other AGI-tested benefits.

It does NOT reduce your self-employment tax. SE tax is computed on net business profit before any of the Schedule 1 adjustments. The 7.65% you wish you could save on the SE side stays where it is.

Who qualifies

You qualify for SEHI if all of the following are true:

You are self-employed (Schedule C, partnership K-1, or 2%+ S-corporation owner with W-2 wages).
You had a net profit reported on Schedule C (or guaranteed payments from a partnership). The deduction is capped at this net profit; if you had a loss, no deduction is allowed.
The insurance is established under your business name (a personal individual policy purchased after you went self-employed counts).
You and your spouse were NOT eligible to participate in a subsidized employer health plan during the months you claim the deduction. Even one month of W-2 employer coverage means you cannot deduct premiums for that month.

What premiums count

The deduction covers:

Medical insurance premiums (any plan — ACA marketplace, COBRA, off-exchange, fully private).
Dental insurance premiums.
Vision insurance premiums (debated treatment; many CPAs include them).
Long-term-care insurance premiums (capped by age — $480 / $890 / $1,790 / $4,770 / $5,960 for ages under 40, 41-50, 51-60, 61-70, 71+ in recent years; verify current limits).
Premiums for your spouse and dependents on the same coverage.

It does NOT cover:

Out-of-pocket medical expenses (those go on Schedule A as itemized medical, subject to the 7.5% AGI floor — almost no freelancer benefits from itemizing for medical).
HSA contributions (those have their own line, Schedule 1 line 13).
The medical portion of car insurance.
Insurance for non-dependent family members.

The "no subsidized employer coverage" rule

The single most-tripped-on requirement: if you OR your spouse have access to a subsidized employer-sponsored health plan, you cannot use SEHI for any month in which that eligibility existed. The IRS does not care whether you actually used the employer plan — only whether it was available.

Two common scenarios:

One spouse has a W-2 job with employer coverage available. Even if the freelancing spouse is on a different individual policy, no SEHI is allowed for the months the employer plan was available.
You had a W-2 job January-March, then went freelance April-December. SEHI is allowed for April-December (9/12 of the year of premiums), not for January-March.

The interaction is computed month by month, not annually.

The income cap

SEHI cannot exceed your net self-employment income for the year. If you had $4,000 of profit and paid $9,000 in premiums, you can only deduct $4,000. The remaining $5,000 does not carry forward — it is simply lost.

Net self-employment income for this purpose is computed AFTER the half-SE deduction and any retirement contributions, which can reduce the SEHI ceiling.

The ACA premium tax credit interaction (the headache)

If you buy your insurance on the ACA marketplace and qualify for the Premium Tax Credit (PTC), the SEHI math gets circular: SEHI lowers AGI, which can INCREASE the PTC, which lowers your effective premium, which would in turn lower SEHI. The IRS resolves this with a special iterative calculation in Pub 974.

Practical advice: every major tax software (TurboTax, TaxAct, FreeTaxUSA, H&R Block) handles the iteration automatically when you enter both your 1095-A (PTC information) and your SEHI. If you self-prepare on paper, the math is annoying enough that this is the case where paying for software earns its price.

S-Corp owners: a separate path

If you operate as an S-Corp and own 2% or more of the stock, the rules differ:

The corporation pays the premiums on your behalf.
The premium amount is added to your W-2 box 1 wages (and box 14 for transparency).
The premiums are NOT subject to FICA (so no SE / payroll tax penalty).
You then deduct the same premium amount as SEHI on your personal Schedule 1 line 17.

Net effect: same federal income tax outcome as a sole proprietor, but the paperwork is different and the requirements are strict. Your CPA or payroll provider needs to set this up correctly during the year — it is not an April-15 fix.

A worked example

Lina is a freelance copywriter. She had $52,000 of net SE income in 2025 (after the half-SE deduction). She is single, no W-2 spouse, no employer coverage available. She paid $580/month for a Silver-tier ACA plan from January through December — $6,960 total. She did not receive any premium tax credit (her income was just above the cliff).

SEHI deduction: $6,960. Falls comfortably under the $52,000 SE income cap.

Tax savings: at her 22% federal marginal rate, $6,960 × 22% = $1,531. Add ~5% state, $348. Total real tax saved by claiming this deduction:~$1,879.

See the immediate-dollar impact in your own situation by running your numbers through the Take-Home Pay calculator with and without the SEHI amount in your "business expenses" field. It is not a Schedule C deduction, but the math is the same — pre-tax money is pre-tax money.

Common mistakes

Putting SEHI on Schedule C line 15 (insurance). That line is for liability and other business insurance — health goes on Schedule 1.
Claiming the deduction in a month when a spouse's employer plan was available, even if not used.
Forgetting that the deduction is capped by net SE income.
Filing on paper while also receiving an ACA premium tax credit — the iterative calculation almost requires software.
Including non-dependent family members' premiums.
Confusing this with the Self-Employed Retirement deduction (line 16) which is a separate large deduction.

Sources and methodology

Rules referenced come from IRC § 162(l), IRS Pub 974 (Premium Tax Credit), Schedule 1 instructions, and current Form 1040 instructions. Federal works are public domain (17 U.S.C. § 105).

Disclaimer: The PTC iteration and S-Corp shareholder rules have edge cases worth a CPA review. This guide is a planning aid, not personalized advice.