How a Self-Insured Medical Reimbursement Plan Works

Small and mid-sized employers face a familiar squeeze: insurance premiums climb year after year, yet the coverage employees actually receive often stays the same or shrinks. If you've watched your renewal quotes tick up by double digits, you already know the frustration. One structure worth serious consideration is the self-insured medical reimbursement plan, sometimes called a SIMRP or SIMERP. It puts you, the employer, in the driver's seat for funding employee healthcare costs, and it comes with tax advantages that a standard group policy simply can't match. But the mechanics matter. Get the plan documents wrong or skip nondiscrimination testing, and you'll hand those tax benefits right back to the IRS. This guide walks through how the plan works, who it's built for, and where the real pitfalls hide.

Defining the Self-Insured Medical Reimbursement Plan (SIMRP)

A SIMRP is an employer-funded arrangement where the company directly reimburses employees for qualifying medical expenses rather than purchasing a traditional insurance policy. The employer assumes the financial risk for covered claims. There's no insurance carrier sitting between you and your employees, which means no carrier profit margin baked into your costs.

This structure represents a forward approach for employers looking to control healthcare expenses while tailoring benefits to their workforce. You decide the reimbursement limits, the eligible expenses, and the plan year. That flexibility is the primary draw.

Core Components and IRS Section 105 Compliance

The legal foundation sits in IRS Section 105, which governs employer-provided accident and health plans. For reimbursements to be tax-free to employees and deductible to you, the plan must meet specific criteria. It must be funded solely by the employer, not through salary reduction. It needs a formal written plan document. And it must satisfy nondiscrimination rules so it doesn't disproportionately benefit owners or highly compensated employees.

Section 105(h) is the provision you'll hear referenced most. It lays out the eligibility and benefits tests that determine whether your plan passes muster. Fail those tests, and highly compensated employees lose their tax-free treatment on reimbursements.

How SIMRPs Differ from Traditional Group Insurance

With a fully insured group plan, you pay a fixed premium to a carrier. That carrier pools risk across many employers and pays claims from the pool. Your costs are predictable but inflexible, and you're paying for the carrier's administrative overhead, profit margin, and state premium taxes.

A self-insured medical reimbursement plan flips that model. You pay claims as they come in, which means low-claim years save you real money. Self-insured plans are also exempt from state premium taxes that typically run 2-3% of premium costs in fully insured arrangements. The trade-off is volatility: a string of expensive claims can blow up your budget if you haven't planned for it.

The Operational Mechanics of Reimbursement

Running a SIMRP requires more than good intentions. You need proper documentation, a clear claims process, and a realistic funding strategy. Skip any of these and you're asking for trouble at audit time.

Establishing Plan Documents and Eligibility Rules

Every SIMRP needs a formal plan document. This isn't optional, and a handshake agreement won't cut it. The document should spell out eligibility requirements, the plan year, maximum reimbursement amounts, and the types of expenses covered. Most employers hire a benefits attorney or a third-party administrator to draft these documents because the IRS expects specific language.

Eligibility rules must be consistent. You can restrict participation by employment classification, such as full-time versus part-time, but you can't cherry-pick individuals. The rules you set must apply uniformly within each classification.

The Claims Submission and Verification Process

Employees submit claims with documentation: receipts, explanation of benefits statements, or invoices from providers. A plan administrator, whether that's someone in-house or a TPA, reviews each claim against the plan's terms and IRS guidelines before approving reimbursement.

This verification step is critical. You can't just hand out checks without confirming the expense qualifies under IRS Publication 502. Sloppy administration is one of the most common mistakes we see. It exposes the employer to penalties and can disqualify the entire plan's tax treatment.

Funding the Plan: Employer Obligations vs. Employee Costs

The employer funds the plan entirely. Employees don't contribute premiums or make salary deferrals. That's a hard rule: if employees pay into the plan, it stops being a Section 105 arrangement and the tax benefits evaporate.

From a cash flow perspective, you're paying claims as they're submitted rather than fronting a lump sum. Some employers set aside a reserve fund to smooth out months with heavier claims. Others use stop-loss insurance to cap their exposure on catastrophic claims, which is a smart move for smaller companies that can't absorb a $200,000 hospital bill.

Tax Advantages for Employers and Employees

The tax benefits are the headline reason most employers explore self-insured reimbursement plans. They're substantial and they compound over time.

Deductibility of Reimbursements as Business Expenses

Every dollar you reimburse under the plan is deductible as an ordinary business expense under IRC Section 162. That's the same treatment as salary, but here's the kicker: reimbursements are exempt from FICA, FUTA, and state unemployment taxes. Employers may save an average of $639 per employee per year on FICA taxes alone through this structure. For a company with 50 employees, that's roughly $32,000 in annual payroll tax savings.

Tax-Free Benefits for Participating Employees

Employees receive reimbursements free of federal income tax and payroll taxes, provided the plan passes nondiscrimination testing. This puts more money in their pockets compared to receiving the same dollar amount as taxable wages. A $3,000 reimbursement is worth $3,000, not $3,000 minus 25% or more in combined taxes.

Eligible Expenses and Coverage Scope

What you can reimburse is defined by the IRS, not by your imagination. Sticking to the rules protects both you and your employees.

IRS Publication 502 Standards

Publication 502 is the master list. It defines medical and dental expenses that qualify for tax-favored treatment. The general test: the expense must be primarily for the prevention or alleviation of a physical or mental defect or illness. Cosmetic procedures that aren't medically necessary don't qualify. Gym memberships generally don't either, unless prescribed by a physician for a specific condition.

Commonly Covered Costs: Premiums, Copays, and Deductibles

Most SIMRPs reimburse employees for out-of-pocket costs tied to their individual health insurance: deductibles, copays, coinsurance, and prescription costs. Some plans also reimburse the premiums employees pay for individual market coverage. Vision and dental expenses typically qualify too.

Here's a practical example. An employee has a high-deductible individual plan with a $3,000 deductible. Your SIMRP reimburses that full deductible amount tax-free. The employee gets first-dollar coverage in practice, and you avoid the overhead of a traditional group plan.

Regulatory Requirements and Compliance Standards

The flexibility of self-insuring comes with compliance obligations that you can't ignore. Federal regulators expect proper testing, reporting, and privacy protections.

Nondiscrimination Testing for Highly Compensated Employees

Section 105(h) requires two tests. The eligibility test checks whether the plan covers a broad enough cross-section of employees, not just owners and top earners. The benefits test ensures that highly compensated employees don't receive a disproportionate share of reimbursements.

If your plan fails either test, the consequences fall on the highly compensated participants. Their reimbursements become taxable income. The plan itself isn't disqualified, but the tax-free treatment disappears for the people who usually designed the plan in the first place. We've seen this trip up closely held businesses where the owner is the primary beneficiary.

HIPAA Privacy and ERISA Reporting Obligations

Self-insured health plans are covered entities under HIPAA. You'll need privacy policies, a designated privacy officer, and safeguards for protected health information. If a TPA handles claims, you need a proper business associate agreement in place.

ERISA requires a Summary Plan Description for participants and, depending on plan size, annual Form 5500 filings. Plans with fewer than 100 participants are often exempt from Form 5500, but the SPD requirement applies regardless of size.

Evaluating the Risks and Benefits of Self-Insuring

The numbers favor self-insuring for many employers, but not all. Roughly 63% of employees with employer-sponsored coverage are now enrolled in self-insured plans, and that percentage keeps growing. Employers who've migrated to level-funded or self-insured structures have paid an average of 22% less than comparable fully insured premiums.

That said, the risk is real. A small employer with 15 employees and no stop-loss coverage could face a devastating claims year. The right approach involves honest assessment of your workforce demographics, your cash reserves, and your appetite for volatility. Stop-loss insurance mitigates the worst-case scenarios and is well worth the cost for most small plans.

With state insurance markets seeing continued rate hikes, including an average 11.1% rate increase approved for Michigan's small group market in 2026, the financial case for self-insuring only strengthens. But financial savings mean nothing if compliance failures wipe out your tax benefits.

If you're seriously considering this structure, start with a benefits attorney and a qualified TPA. Get the plan documents right from day one. Run nondiscrimination testing annually, not just when you remember. And build a reserve fund that can handle a bad quarter without putting your business at risk.

FAQ

Can a sole proprietor set up a SIMRP for themselves? No. Sole proprietors, partners, and S-corp shareholders who own more than 2% aren't eligible for tax-free reimbursements under Section 105. They can still establish a plan for their W-2 employees.

Is stop-loss insurance required for a self-insured plan? It's not legally required, but it's strongly recommended, especially for employers with fewer than 200 employees. Stop-loss policies cap your exposure on individual high-cost claims or aggregate annual claims.

Can we limit the plan to certain employee groups? Yes, but the classifications must be legitimate and nondiscriminatory. Full-time versus part-time is acceptable. Excluding employees based on health status or claims history is not.

How is a SIMRP different from an HRA? A Health Reimbursement Arrangement is actually a type of self-insured medical reimbursement plan. The HRA is the most common structure used to implement this concept. The terms overlap significantly.

What happens if our plan fails nondiscrimination testing? Highly compensated employees must include their reimbursements as taxable income. Rank-and-file employees keep their tax-free treatment. The plan itself continues to operate.