Executive Summary
- Health Insurance Add-Back: S-Corp owners with 2%+ ownership must report company-paid health insurance premiums as W-2 wages—contact your payroll provider now with 2025 premium totals
- Reasonable Salary Requirement: Pay yourself adequate W-2 wages before taking distributions to avoid IRS audits; use resources like RCReports.com to determine appropriate compensation levels
- Hiring Your Kids: Unlike LLCs, S-Corps must withhold Social Security and Medicare taxes from children’s wages—the family business FICA exemption doesn’t apply to corporations
Introduction
If you operate as an S-Corporation, you’re already benefiting from one of the most tax-efficient business structures available. However, S-Corps come with specific IRS requirements that don’t apply to LLCs or sole proprietorships. Missing these rules can trigger audits, penalties, or unexpected tax bills.
Before you close out the year, let’s review three critical S-Corp tax rules that every owner needs to understand and act on.
1. The Health Insurance “Add-Back” Rule for S-Corp Owners
What You Need to Know
If your S-Corporation pays for health insurance premiums for any shareholder who owns 2% or more of the company’s stock, the IRS has a special reporting requirement that many business owners overlook.
The Rule Explained:
When your company pays health insurance premiums on your behalf, those premium amounts must be added to Box 1 of your W-2 as taxable wages. This means the premiums are treated as income subject to federal and state income tax. The good news? These amounts are typically exempt from Social Security and Medicare taxes (FICA).
Why This Rule Exists
The IRS treats 2%+ shareholders differently from regular employees. While rank-and-file employees can receive health insurance as a tax-free fringe benefit, owners with significant stakes cannot. The rationale is that these owners have substantial control over the company and its compensation decisions.
The Silver Lining
While these premiums get added to your taxable wages, you don’t lose the tax benefit entirely. You can claim a self-employed health insurance deduction on your personal tax return (Form 1040), which reduces your adjusted gross income. This deduction is taken “above the line,” meaning you don’t need to itemize to claim it.
Action Step for Year-End
Do this now: Calculate the total health insurance premiums your S-Corp paid for you in 2025 and email this information to your payroll provider. They need this data to properly code your final W-2 before year-end. If you’re unsure of the total amount, check your business bank statements or insurance provider records.
2. The “Reasonable Salary” Requirement: Protecting Yourself from IRS Scrutiny
Understanding the IRS’s Position
One of the most common—and costly—mistakes S-Corp owners make is paying themselves too little in W-2 wages while taking large distributions to minimize payroll taxes.
Why It Matters:
S-Corp distributions aren’t subject to Social Security and Medicare taxes (15.3% self-employment tax), which makes them attractive. However, the IRS requires that you pay yourself a “reasonable salary” through W-2 wages before taking any profit distributions. If your wage-to-distribution ratio looks suspicious, you’re at high risk for an audit.
What “Reasonable” Really Means
The IRS doesn’t provide a specific formula, but “reasonable compensation” generally means what you would pay an unrelated third party to perform the same duties. Factors the IRS considers include:
- The nature and scope of your work
- Your qualifications and experience
- Time and effort spent in the business
- Compensation paid by comparable businesses for similar services
- Your company’s profitability and revenue
Tools to Determine Reasonable Compensation
One valuable resource for determining appropriate salary levels is RCReports.com (Reasonable Compensation Reports). This service provides industry-specific compensation data based on your business type, location, revenue, and job responsibilities. Having a formal reasonable compensation report can provide documentation to support your salary decisions if the IRS ever questions your compensation structure.
Other resources include:
- Bureau of Labor Statistics salary data
- Industry trade association surveys
- Local job postings for comparable positions
- Guidance from your CPA or tax advisor
The Audit Risk
The IRS has been increasingly aggressive in pursuing S-Corp owners who underreport wages. In audit situations, the IRS can reclassify distributions as wages, which means you’ll owe back payroll taxes, plus penalties and interest.
The Year-End Check
Review your total W-2 wages for 2025 against your distributions. Ask yourself honestly: “Would I pay someone else this wage to run my business?” If the answer is no, consider adjusting your compensation structure for the coming year. Many tax professionals recommend a 60/40 split (60% wages, 40% distributions) as a reasonable starting point, though this varies by industry and individual circumstances.
3. Hiring Your Kids: S-Corp Rules Are Different (and Stricter)
The Popular Tax Strategy
Hiring your children is a legitimate and powerful tax strategy that many business owners use. It allows you to shift income to lower tax brackets, teach your kids about business, and potentially fund their retirement accounts or education savings.
The Critical Difference for S-Corps
However, the tax benefits work differently—and less favorably—in an S-Corporation compared to a sole proprietorship or single-member LLC.
In a Standard LLC (Sole Proprietorship):
- Children under 18 are exempt from Social Security and Medicare taxes (FICA)
- This exemption applies when the child works for their parent’s unincorporated business
- No federal unemployment taxes (FUTA) are required for children under 21
In an S-Corporation:
- This FICA exemption does not exist
- You must withhold and pay Social Security and Medicare taxes from your children’s wages, just like any other employee
- They’re treated as regular W-2 employees with all the associated payroll tax obligations
Why the Difference Exists
The exemption for sole proprietorships exists because the business and owner are legally the same entity. An S-Corporation, however, is a separate legal entity—even if you’re the only shareholder. Therefore, your children are considered employees of the corporation, not employees of you personally, which eliminates the FICA exemption.
Making It Legitimate
If you do hire your children in your S-Corp, remember these compliance requirements:
- Document legitimate work: Keep detailed records of duties performed, hours worked, and how the work benefits the business
- Pay reasonable wages: Compensation should align with what you’d pay an unrelated person for the same work
- Run formal payroll: Issue W-2s, withhold appropriate taxes, and maintain proper payroll records
- Keep timesheets: Document actual hours worked, especially for younger children
The IRS scrutinizes family employment arrangements, so maintaining thorough documentation is essential.
Final Thoughts: Year-End Action Items
Before you wrap up the year, take these three steps:
- Calculate and report health insurance premiums paid by your S-Corp for 2%+ shareholders to your payroll provider
- Review your salary-to-distribution ratio to ensure your W-2 wages reflect reasonable compensation (consider using RCReports.com for documentation)
- If you employ your children through your S-Corp, verify that payroll taxes are being properly withheld and reported
S-Corporation ownership offers tremendous tax benefits, but those benefits come with compliance responsibilities. Understanding these three rules helps you maximize tax savings while staying on the right side of IRS regulations.
If you would like to schedule a free 20-minute consultation, please use the following link: Contact Us – Pasquesi Partners LLC