If you operate your business as an S corporation, you continue to enjoy good news in 2026 when it comes to your health insurance. The rules that have governed the deduction for years remain in place, and the One Big Beautiful Bill Act of 2025 did not disturb them. 

This update walks you through everything you need to do with your S corporation to lock in your health insurance deductions and steer clear of the $100-a-day penalties under the Affordable Care Act (ACA). It also covers the following two traps that quietly cost owners their deductions every year: 

1. The box 5 “earned income” rule 

2. The family member attribution rule 

The Good News: The Old Rules Still Apply 

Nothing in the 2026 tax code changes the basic deal. 

Your S corporation can cover you, your spouse, your dependents, and your children under age 27, and you can deduct the cost—provided you run the premiums through the three-step process described below. 

Step 1. Get the Insurance on the S Corporation’s Books 

You can do this in one of two ways:

1.  Direct payment. The S corporation pays the premiums directly to the insurance company for the accident and health policy that covers   the owner-  employee who owns more than 2 percent of the stock (and his or her spouse and dependents, if applicable). 

2.Reimbursement. The owner-employee pays the premiums and submits proof to the S corporation, which then reimburses the owner-              employee. 

Step 2. Put the Premiums on Your W-2 

The S corporation includes the health insurance premiums on the owner-employee’s W-2. The income is not subject to payroll taxes (Social Security and Medicare). In other words, the corporation adds the premiums to box 1 of the W-2 but not to box 3 or box 5.

Step 3. Deduct the Premiums on Your Form 1040 

You (owner-employee who owns more than 2 percent of the stock) claim the cost as the self-employed health insurance deduction on Schedule 1 of your Form 1040, line 17—provided you clear the two hurdles below. 

Beware: Two Hurdles to the 1040 Deduction 

To claim the deduction on Schedule 1, line 17, you have to satisfy two rules: 

1. 1. 1. No access to employer-subsidized coverage. You cannot take the deduction if you or your spouse is eligible for employer-subsidized health insurance. If your spouse can get family coverage as a tax-advantaged fringe benefit at his or her job, you lose the deduction—even if your spouse never actually enrolls.

1. 1. 2. Adequate salary. Your deduction cannot exceed your earned income from the S corporation. As you will see in the next section, “earned income” here has a very specific—and easy to overlook— meaning.

Example 1. You are the sole owner of your S corporation. You buy an accident and health policy in your own name and pay the premiums yourself. The S corporation makes no payments and no reimbursements. Because the corporation never established a medical-care plan for you, you get no self-employed health insurance deduction. 

Example 2. Same facts, except you submit proof of the premiums to your S corporation, the corporation reimburses you with a corporate check, and it reports the reimbursement as wages on your W-2. Now the corporation has established the plan. 

You qualify to deduct the premiums as self-employed health insurance on Schedule 1 (assuming no other employer coverage is available to you or your spouse). 

The Earned-Income Trap: Watch Your Box 5 Medicare Wages 

Here is the rule that can destroy deductions. For a shareholder who owns more than 2 percent shareholder, the tax code defines “earned income” for the health insurance deduction as your box 5 Medicare wages—not your box 1 wages.

Recall from Step 2 that the premiums land in box 1 but not box 5. 

If box 5 is small (or zero), your deduction is limited to that figure, even though the full premium sits in box 1 as taxable wages. The Form 1040 instructions are misleading on this point: they emphasize box 1, but a footnote buried in the self-employed health insurance deduction worksheet confirms that box 5 is the controlling figure. 

Key point. To get your full deduction, your S corporation Medicare wages in box 5 must be equal to or greater than what the corporation paid or reimbursed for your health insurance. 

Example 3. Ted is the sole owner of his S corporation. The corporation reimburses him $18,000 for his family health plan, putting $18,000 in box 1 and $0 in box 5. The $18,000 is Ted’s only compensation for the year. Ted’s self-employed health insurance deduction is zero, because his earned income (box 5 Medicare wages) is zero. 

Beware. This commonly happens when someone launches a new S corporation. They take no salary in Year One but have the corporation pick up the health insurance tab. 

Example 4. Janet is the sole owner of her S corporation. It pays her a $107,000 salary and reimburses $22,000 of individually purchased family coverage. The corporation reports $129,000 in box 1 and $107,000 in box 5. Janet deducts the full $22,000, because her $107,000 of box 5 earned income easily exceeds the insurance cost. 

Reasonable compensation. Janet’s reasonable compensation is the full $129,000 (wages plus the health insurance). 

Example 5. Ken’s S corporation had a rough year and posted a $180,000 loss. Ken took no salary, but the corporation still reimbursed him for health insurance. Result: a zero self-employed health insurance deduction— and (depending on his situation) he may even owe tax on the premium amount that landed in box 1. 

Example 6. Ava’s S corporation earned $790,000, paid her $80,000 in salary, and paid $20,000 for her family coverage. Her W-2 shows $100,000 in box 1 and $80,000 in box 5. Because box 5 ($80,000) exceeds the $20,000 of insurance, Ava deducts the full $20,000 on Schedule 1, line 17, of her Form 1040. 

Reasonable compensation. Ava’s reasonable compensation is $100,000. 

The Family Member Surprise: Section 318 Attribution 

If your relatives work in your S corporation, stop and check this. 

The three-step rule above does not apply only to you—it can apply to family members who work for the business and own no stock at all. 

Under the family attribution rules of tax code Section 318, the law treats certain relatives as owning the same stock you own. So a family member on your payroll is deemed a shareholder with more than 2 percent of stock and gets swept into the same W-2 regime.

The attribution reaches the following relatives: 

• Spouse 

• Children 

• Grandchildren 

• Great-grandchildren Parents 

• Grandparents 

• Great-grandparents 

Example 7. You own 100 percent of your S corporation and employ your 30-year-old daughter, who owns no stock. The corporation covers her under its group health plan. Because Section 318 attributes your ownership to her, she is considered a shareholder with more than 2 percent of stock. 

The corporation must add the cost of her coverage to box 1 of her W-2 and deduct it as wages—not as health insurance. If you did that, good: the corporation keeps its deduction, and your daughter can claim the self employed health insurance deduction on her own Form 1040 (if she can clear the two hurdles described above). 

Get this wrong, and the money is simply lost: the corporation gets no health insurance deduction, and the family member gets no 1040 self-employed health insurance deduction. 

A few years ago, the IRS confirmed that a person who owns the stock solely by attribution can still claim the self employed health insurance deduction, provided the other requirements are met.

How to Fix a Mistake 

If there was no attribution treatment at all, do three things: 

1. Amend the S corporation return to claim the insurance as a wage expense. 

2. Amend the family member’s W-2 to add the insurance to box 1 wages. 

3. Amend the family member’s Form 1040 to correct the wages and (if eligible) claim the self employed health insurance deduction. 

If the W-2 was right but the 1040 deduction was missed, the fix is simpler: amend the family member’s Form 1040 to claim the deduction (if eligible). 

Refund deadline. If an amended return produces a refund, you must file it within the later of three years from the original filing date or two years from the date you paid the tax. As a practical matter for filing an amended return in 2026, that generally means the open years are 2024, 2023, and 2022. 

Rank-and-File Employees 

As a small employer, your S corporation is not required to provide any health benefits to its employees. “Small employer” here means fewer than 50 full-time employees or full-time equivalents.

But when you do offer medical benefits to employees who are not owners, you walk into the $100-a-day penalty zone if you do it wrong. The big no-no is reimbursing employees for individually purchased health insurance outside of an approved arrangement. 

You can, however, reimburse employees for at least some or perhaps all of their individually purchased coverage using either the qualified small employer health reimbursement arrangement (QSEHRA) or the individual coverage HRA (ICHRA). 

2026 QSEHRA limits. For tax years beginning in 2026, the maximum reimbursement is $6,450 for self-only coverage ($537.50 per month) and $13,100 for family coverage ($1,091.67 per month).

ICHRA. The ICHRA has no dollar cap and no employer-size limit. It continues to operate under the 2019 final regulations; the 2025 tax law did not change it (see “What’s New—and What Isn’t—for 2026,” below).

Remember, as an S corporation owner, you don’t need to cover employees. Your S corporation can reimburse you and its other owners with more than 2 percent of stock for individually purchased insurance, with no penalty. 

But if your S corporation reimburses rank-and-file employees for individual insurance without a QSEHRA or ICHRA, it faces a $100-a-day excise tax per employee—$36,500 per year, per employee—under Section 4980D.

Group Insurance and You 

Suppose your S corporation provides group health insurance to everyone, including you. The corporation must treat you differently from the non-owner (rank-and-file) employees:  

• Non-owner employees. The S corporation deducts its contributions to the group health plan, and the employees receive the benefits tax-free.

• Owners of more than 2 percent. You and the corporation run the three-step process. The corporation buys the group coverage (Step 1) and reports your share as W-2 compensation (Step 2), and you deduct it on your Form 1040 (Step 3).

Discrimination 

As of 2026, the IRS still does not enforce the non-discrimination provisions of the ACA for these arrangements.That means you and your S corporation can legally discriminate without ACA penalties. For example, you can 

• • • • have the corporation buy health insurance for you and nothing for the rank-and-file employees, or · 

      • have the corporation reimburse your individual insurance while running a separate group plan for everyone else. 

Premium Tax Credit and Your Deduction—Changed for 2026 

If you buy individual coverage through the government marketplace (the federal exchange or a state exchange), you can still combine the premium tax credit with your self-employed health insurance deduction. But because the credit reduces your net premium cost, you have to coordinate the two using a circular calculation—the deduction reduces income, which can change the credit, which changes the deduction. 

The mechanics of that coordination are unchanged.

What did change. The temporarily enhanced premium tax credit lapsed for coverage years beginning after December 31, 2025. The credit reverted to its pre-2021 form for 2026, which means a smaller subsidy for many households and the return of the eligibility cliff at 400 percent of the federal poverty line—above that line, there is no credit at all.

Marketplace premiums also rose sharply for 2026. 

For S corporation owners, the practical effect is a larger out-of-pocket premium for marketplace coverage and, for some, no credit to coordinate at all. Managing your adjusted gross income (through retirement plan and HSA contributions and the timing of business income) can matter more in 2026 if you want to stay under the income ceiling. 

Note that this is a fluid area: a multi-year extension of the enhanced credit passed the House in early 2026 and was, at last report, awaiting Senate action—so confirm the current state of the law before you plan around it. 

What’s New—and What Isn’t—for 2026 

Core S corporation rules: unchanged. The three-step W-2 method, the two 1040 hurdles, the box 5 earned income rule, and the Section 318 family attribution rule all survived intact into 2026. 

QSEHRA limits: up modestly. The 2026 limits are $6,450 self-only and $13,100 family. 

The $36,500 penalty: unchanged. The $100-a-day Section 4980D excise tax is set by statute and is not indexed for inflation, so it remains $36,500 per year per employee. 

ICHRA CHOICE codification: did not happen. The 2025 tax law dropped the provisions that would have written ICHRAs into the statute and renamed them CHOICE arrangements. ICHRAs continue under the 2019 regulations. (Separate legislation to codify them is still pending in 2026.)   Enhanced premium tax credit: expired. The enhanced premium tax credit subsidies lapsed January 1, 2026, reverting the credit to pre-2021 rules. 

Takeaways 

Your 2026 S corporation health insurance treatment continues as before. Your plan can cover you, your spouse, your dependents, and your children under age 27. To qualify for the self-employed health insurance deduction, run the three steps: 

1. Make the S corporation pay your premiums—directly or by reimbursement. 

2. Have the corporation include the premiums as wages in box 1 of your W-2. 

3. Deduct the premiums on Schedule 1 (Form 1040), line 17. 

Then clear the two hurdles: neither you nor your spouse may be eligible for another employer’s subsidized coverage, and—critically—your box 5 Medicare wages must be at least as large as the insurance cost, or your deduction shrinks to that smaller figure. 

Apply the same three steps to any spouse, child, grandchild, parent, or grandparent who works for your S corporation and receives coverage, even if they own no stock directly. Your spouse and your under-age-27 children can ride on a family plan, with the premium added to your W-2.

For rank-and-file employees, never reimburse individually purchased insurance outside a QSEHRA or ICHRA, or you risk the $36,500-per-employee penalty. And if your S corporation handled any of this incorrectly in a still-open year, get busy amending those returns.