Who counts as a 2% shareholder
The special health insurance treatment applies to a shareholder who owns more than 2% of the corporation's outstanding stock, or stock with more than 2% of the combined voting power. In a one- or two-owner business, that is every owner.
If family members also own shares or work in the business, confirm how the rule applies to each of them before the premiums are set up. The treatment below is written for the owner-employee.
How the premiums are treated
The IRS S corporation compensation page sets out the treatment. Premiums the corporation pays for a more-than-2% shareholder-employee are deductible by the corporation and included in the shareholder's wages. Where the premiums are paid under a plan for all or a class of employees, those added wages are not subject to Social Security, Medicare or federal unemployment tax. The result on the W-2 is premiums in Box 1, but not in Boxes 3 and 5.
The shareholder may then take an above-the-line deduction for the premiums in arriving at adjusted gross income, provided the coverage was established by the S corporation and the other self-employed health insurance deduction requirements are met. The deduction is not available if the shareholder or the shareholder's spouse was eligible to participate in any subsidized health plan, for example through a spouse's employer.
| W-2 box | Premiums included? | Effect |
|---|---|---|
| Box 1, wages | Yes | Included in taxable wages |
| Box 3, Social Security wages | No | No Social Security tax on the premiums |
| Box 5, Medicare wages | No | No Medicare tax on the premiums |
| Personal return | Above-the-line deduction | Available if the requirements are met and no subsidized plan was available |
The mechanics decide the deduction
The IRS page explains that some states' insurance laws do not allow a corporation to buy group coverage for a single employee, so a sole owner often buys a policy in their own name. Notice 2008-1 covers that case. If the shareholder buys the policy personally and pays for it with personal funds, with no payment or reimbursement by the corporation, there is no above-the-line deduction under this route. If the corporation pays the premiums directly, or reimburses the shareholder, and includes them on the W-2, the deduction is allowed.
The IRS summary is blunt: the premiums must ultimately be paid by the S corporation and reported as taxable compensation on the shareholder's W-2.
- 1.Decide whether the corporation pays the insurer directly or reimburses you
- 2.Pay or reimburse from the corporation's account, with the premium statements kept
- 3.Tell your payroll provider the annual premium total before the year-end W-2 run
- 4.Confirm the premiums appear in Box 1 and not in Boxes 3 and 5
- 5.Check whether you or your spouse were eligible for a subsidized plan during the year
Reimbursement arrangements and other employees
A corporation that reimburses individual health premiums can run into the Affordable Care Act market reform rules. The IRS page notes that the potential excise tax is $100 per day, per employee, per violation. It also explains the exception for plans covering fewer than two current employees, and that under Notice 2015-17 a corporation whose only other employees are the shareholder's spouse or child, covered under the same family arrangement, is treated as covering one employee.
Once non-family employees are involved, the picture changes, and a 2% shareholder-employee cannot participate in a qualified small employer health reimbursement arrangement at all. If the business has, or is about to have, other employees, settle the health arrangement before reimbursing anything.
Retirement contributions follow the salary
Retirement plan contributions for you as an owner-employee are based on compensation as the plan defines it. For an owner on an S corporation payroll, that is W-2 wages. Distributions are not wages, and the profit on your K-1 does not count.
The IRS one-participant 401(k) page illustrates the structure. An owner can make elective deferrals up to 100% of compensation, up to the annual deferral limit, and the business can make employer nonelective contributions of up to 25% of compensation as defined by the plan. For a self-employed individual, by contrast, compensation is earned income: net earnings from self-employment after deducting half of the self-employment tax and the contributions themselves.
This page deliberately gives no dollar contribution limits. They change each year and depend on the plan type; check the current figures on the IRS retirement plan pages for the year in question.
Why this changes the salary conversation
The salary you pay yourself has to be reasonable compensation for your services, and the IRS lists the factors: duties, time and effort, training, what comparable businesses pay and so on. Retirement is not one of those factors, and a salary chosen only to fund a plan is not a reasonable compensation argument.
But within a defensible range, the salary level has knock-on effects. A lower salary means less payroll tax and a larger qualified business income figure, but also a smaller base for employer retirement contributions. A higher salary does the reverse. Health premiums added to Box 1 do not change the Social Security and Medicare wages. These effects pull in different directions, which is why a comparison has to show them together.
- Payroll tax: rises with salary, up to the Social Security wage base ($184,500 for 2026) and without limit for Medicare
- Massachusetts PFML: 0.88% of eligible wages for 2026, or 0.46% for employers with fewer than 25 covered individuals; the 2027 rate has not been set yet
- Qualified business income: salary is not QBI, so a higher salary lowers the QBI base
- Retirement plan room: rises with salary
- Health premiums: in Box 1 but not Boxes 3 and 5, whatever the salary
Where we come in
We prepare the corporation's 1120-S and 355S and your personal returns, so the W-2, the health insurance deduction and the K-1 are read together rather than separately. We can run the comparison with your actual numbers, including premiums and a planned retirement contribution, and we offer payroll support alongside your provider with tasks agreed in writing. We give you a scope and a price in writing before anything starts.
Figures on this page were checked against the IRS and Massachusetts sources listed alongside on 28 Sep 2026. They change — confirm the current amount before relying on one.
General information for owner-led businesses, not advice for your specific situation. Tax and accounting rules change, and how they apply depends on facts particular to your business. Talk to us — or to another qualified professional — before acting on anything here.
