If you own more than 2% of an S-Corp and pay for health insurance, the premiums must be included in your W-2 Box 1 wages but excluded from Boxes 3 and 5 (FICA wages). Getting this wrong can trigger IRS notices and may disqualify your self-employed health insurance deduction on Schedule 1, Line 17. Greg Monaco, CPA reviews this reporting for every S-Corp client during year-end and W-2 preparation.
Health insurance premiums for S-Corp shareholders who own more than 2% of the company require special treatment. The premiums must be included on your W-2, but they’re also deductible on your personal return.
How Does the S-Corp Health Insurance Deduction Rule Work?
The S-Corp includes the premium amount in the shareholder’s W-2 Box 1 as additional compensation. However, they are not subject to FICA taxes and should not be included in Boxes 3, 5, or 6. The shareholder then claims the self-employed health insurance deduction on Line 17 of Schedule 1.
What Are the Most Common S-Corp Health Insurance Mistakes?
The biggest mistake is not reporting the premiums on the W-2 at all. Another common error is including the premiums in FICA wages, which results in unnecessary payroll taxes. Some NJ S-Corp owners pay premiums personally and never run them through the business.
How Does New Jersey Treat S-Corp Health Insurance?
New Jersey follows the federal treatment for health insurance premiums. The self-employed health insurance deduction flows through to your NJ-1040 the same way it does federally.
Bottom Line
If you have an S-Corp and you’re paying for your own health insurance, make sure the premiums are flowing through the company’s books and appearing on your W-2 correctly.
Key Takeaway
S-Corp health insurance reporting requires coordination between the company's books, payroll, and your personal return. The premiums flow through the business as a deductible expense, appear on your W-2 in Box 1 only, and then get deducted on your personal return as the self-employed health insurance deduction. All three steps must align for the deduction to hold up under review.
Related reading: S-Corp Salary vs. Distributions | Health Insurance Deductions for NJ Self-Employed | LLC vs. S-Corp in NJ | Small business tax services
Frequently Asked Questions
Where does S-Corp health insurance go on the W-2?
S-Corp health insurance premiums for 2%+ shareholders must be included in W-2 Box 1 (wages, tips, other compensation) but excluded from Boxes 3 and 5 (Social Security and Medicare wages). This means the premiums increase gross income but do not generate additional FICA taxes. The shareholder then deducts the premiums on Schedule 1, Line 17 of their personal return.
Does NJ follow federal rules for S-Corp health insurance?
Yes. New Jersey follows the federal treatment for S-Corp shareholder health insurance premiums. The self-employed health insurance deduction flows through to your NJ-1040 the same way it does federally, so you get the deduction at both the federal and state level.
What if I paid premiums personally instead of through the S-Corp?
If you paid premiums personally, the S-Corp should reimburse you and include the reimbursement in your W-2 Box 1. Without running the premiums through the company's books, you cannot claim the self-employed health insurance deduction on Line 17. Instead, you would only be able to deduct premiums as an itemized medical expense subject to the 7.5% AGI floor, which provides significantly less tax benefit.
