MERP for S-Corp Owners: Turning Personal Medical Bills Into Business Deductions

Medical expenses represent one of the largest personal costs that S-Corp owners face each year, yet most business owners continue paying these bills entirely with after-tax dollars. For an S-Corp owner in a combined federal and state tax bracket of 35% to 40%, every dollar spent on medical, dental, and vision care effectively costs $1.50 or more once taxes are factored in. A Medical Expense Reimbursement Plan, commonly known as a MERP, offers a straightforward and fully legal mechanism to convert those personal medical costs into above-the-line business deductions. When structured correctly under IRC Section 105, a MERP allows the S-Corp to reimburse its owner (and the owner's family) for qualifying medical expenses, turning what would otherwise be a nondeductible personal expenditure into a deductible business expense.

What Is a MERP and How Does IRC Section 105 Apply?

A Medical Expense Reimbursement Plan is an employer-funded arrangement under which the business agrees to reimburse eligible employees for medical expenses not covered by insurance. The legal foundation for MERPs is found in IRC Section 105(b), which excludes from an employee's gross income any amounts received as reimbursement for medical care as defined under IRC Section 213(d). In practical terms, this means that when the S-Corp reimburses its owner-employee for out-of-pocket medical costs, those reimbursements are deductible by the corporation as ordinary and necessary business expenses under IRC Section 162, while simultaneously being excludable from the employee's taxable income under the general rules of Section 105.

For S-Corp shareholders who own more than 2% of the company's stock, the tax treatment follows a specific pathway established by IRC Section 1372. This provision states that for purposes of fringe benefits, a more-than-2% shareholder of an S-Corp is treated similarly to a partner in a partnership rather than as a traditional employee. The practical consequence is that medical reimbursements paid through a MERP must be included in the shareholder-employee's W-2 wages. However, the shareholder then claims a corresponding deduction for self-employed health insurance on Line 17 of Schedule 1 (Form 1040), resulting in an above-the-line deduction. The net effect is that the S-Corp gets a wage deduction, and the owner gets an income tax deduction, while avoiding the 7.5% AGI floor that would otherwise limit medical expense deductions under IRC Section 213(a).

The More-Than-2% Shareholder Rules

Understanding the more-than-2% shareholder rules is essential for S-Corp owners who want to implement a MERP correctly. Under IRC Section 1372(a), any person who owns more than 2% of the outstanding stock of an S-Corp, or more than 2% of the total combined voting power of all stock, on any day during the S-Corp's taxable year is treated as a partner for fringe benefit purposes. This attribution extends to family members as well. Under IRC Section 318(a)(1), stock owned by a spouse, children, grandchildren, or parents is attributed to the individual, which means that even if the owner technically holds only 1% of the stock but their spouse holds another 2%, they are treated as a more-than-2% shareholder.

Because of this partner-like treatment, the MERP reimbursements cannot simply be paid tax-free the way they would be for a rank-and-file employee. Instead, the S-Corp must include the reimbursement amounts in the shareholder-employee's Box 1 wages on their W-2, though these amounts are not subject to FICA taxes if the plan is established under IRC Section 105. The shareholder-employee then takes the self-employed health insurance deduction on their personal return. This two-step process achieves the same economic result as a direct exclusion: the medical expenses are fully deductible, just through a different mechanical pathway than what applies to non-shareholder employees.

Eligible Expenses Under a MERP

The scope of expenses that qualify for MERP reimbursement is defined by IRC Section 213(d), which provides a broad definition of "medical care." Eligible expenses include health insurance premiums, copays, deductibles, prescription medications, dental work including orthodontics and implants, vision care including corrective surgery, mental health services, chiropractic care, and physical therapy. The plan can also cover expenses for the shareholder-employee's spouse and dependents, making it particularly valuable for business owners with families who have significant annual medical costs.

One of the most powerful aspects of a MERP is that it captures expenses that would otherwise fall below the 7.5% AGI threshold required for itemized medical deductions under Section 213(a). For an S-Corp owner with an adjusted gross income of $400,000, only medical expenses exceeding $30,000 would be deductible as an itemized deduction. Through a properly structured MERP, every dollar of qualifying medical expense becomes deductible from the very first dollar spent, with no floor and no ceiling (unless the plan document specifies one). This distinction alone can generate thousands of dollars in annual tax savings for business owners who carry high-deductible health plans or who have recurring medical costs that never quite reach the AGI threshold.

Setting Up a Compliant MERP for Your S-Corp

Establishing a MERP requires a formal written plan document adopted by the S-Corp's board of directors. The plan document must specify the classes of employees eligible for reimbursement, the types of medical expenses covered, the maximum reimbursement amounts (if any), and the procedures for submitting and processing claims. While the IRS does not require that a MERP be filed with any government agency, the plan must exist as a written document before any reimbursements are made. Retroactive adoption of a MERP to cover expenses already incurred is not permitted and could jeopardize the deductibility of reimbursements.

The plan must also satisfy nondiscrimination requirements under IRC Section 105(h) if it covers non-shareholder employees in addition to the owner. Section 105(h) requires that the plan not discriminate in favor of highly compensated individuals with respect to eligibility or benefits. However, for S-Corps where the only employee is the owner (or the owner and their spouse), the nondiscrimination rules are effectively moot because there is no class of excluded lower-paid employees. For S-Corps with additional staff, careful plan design is necessary to ensure compliance. One common approach is to provide a baseline level of MERP coverage to all full-time employees while offering enhanced benefits that are proportional to compensation, which can satisfy the nondiscrimination tests when properly structured.

Payroll and Reporting Requirements

Proper payroll treatment is critical for MERP compliance. For more-than-2% shareholders, the S-Corp must include MERP reimbursements in the shareholder-employee's gross wages reported in Box 1 of Form W-2. Per IRS Notice 2008-1, these amounts should also be reported in Box 14 or on a separate statement provided to the employee. The reimbursements are subject to federal income tax withholding but are generally exempt from FICA (Social Security and Medicare) taxes when paid under a qualifying Section 105 plan. This FICA exemption provides an additional layer of savings, as both the employer and employee portions of FICA (totaling 15.3% on the first $168,600 of wages in 2026, and 2.9% on wages above that threshold) are avoided on the reimbursed amounts.

Record-keeping is straightforward but must be maintained diligently. The S-Corp should retain copies of all medical receipts, explanation of benefits statements, and reimbursement requests. Each reimbursement should be documented with the date of the medical service, the provider, the nature of the expense, the amount, and confirmation that the expense qualifies under IRC Section 213(d). These records should be kept for at least seven years to withstand potential IRS examination.

Common Mistakes to Avoid

The most frequent error S-Corp owners make with MERPs is failing to adopt a written plan document before making reimbursements. Without a formal plan in place, the IRS can reclassify reimbursements as nondeductible distributions or additional compensation subject to full employment taxes. Another common mistake is neglecting to include the reimbursements on the shareholder-employee's W-2, which can trigger penalties and disallow the corresponding self-employed health insurance deduction on the owner's personal return.

S-Corp owners should also be cautious about the interaction between a MERP and a Health Savings Account (HSA). If the MERP provides first-dollar coverage for medical expenses, it is considered a general-purpose health plan that disqualifies the individual from making HSA contributions under IRC Section 223(c)(1). To preserve HSA eligibility, the MERP can be designed as a "limited-purpose" plan that covers only dental, vision, and preventive care, or as a "post-deductible" plan that only reimburses expenses after the high-deductible health plan's minimum deductible has been met. This coordination requires careful drafting of the plan document but allows the owner to benefit from both tax-advantaged vehicles simultaneously.

Quantifying the Tax Savings

Consider an S-Corp owner in a 37% federal bracket with $15,000 in annual out-of-pocket medical expenses for their family. Without a MERP, those expenses are paid with after-tax dollars, and assuming the owner's AGI is high enough that the 7.5% floor eliminates any itemized deduction, the full $15,000 carries no tax benefit whatsoever. With a properly structured MERP, the entire $15,000 becomes deductible. At a 37% federal rate plus a 6.9% state rate, the annual tax savings exceed $6,500. Over a five-year period, that totals more than $32,000 in tax savings from a single, relatively simple planning strategy. When FICA savings on both the employer and employee side are added to the calculation, the total benefit grows even larger.

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This article is for informational purposes only and does not constitute legal or tax advice. Consult a qualified tax professional regarding your specific circumstances. AE Tax Advisors, 935 Lake Elmo Dr, Suite B, Billings, MT 59105. Phone: (631) 614-5762.