Section 125 Key Employee Concentration Test — How It Works

The 25% key-employee concentration test under IRC § 125(b) confirms key employees aren't receiving more than 25% of the plan's nontaxable benefits. The Preventive Care structure passes cleanly because participation is uniform across W-2 employees.

This post unpacks the underlying authority, the practical implications for employers, and how the program structure stays inside the lines.

The Section 125 Preventive Care variant we work with carries a complete compliance documentation set: the May 2025 HitesmanLaw P.A. opinion letter (8 pages), the August 2025 CBIZ Advisors LLC independent review, the underlying IRS authority (IRC §§ 125, 105, 106, plus Rev. Rul. 69-154, Situation 3), and $500,000 of insurance-backed legal protection per enrolled employer. The documentation is share-able with your CPA, your benefits broker, your attorney — and routinely is, before any client signs.

How the math works (in 90 seconds)

For every enrolled W-2 employee earning $25,000+/year and covered under an ACA-compliant group health plan:

• Pre-tax salary reduction: $1,200/month · $14,400/year
• Employer FICA savings (7.65%): $1,101.60/year
• Net employer savings: $681.60/employee/year
• Employee net take-home raise: +$71.96/paycheck (~$863/year)
• Workers' Comp reduction: 30–60% real-world at next audit cycle (because WC base = taxable payroll, which Section 125 reduces by definition)

A 50-employee company nets $34,080/year in net FICA + industry-specific WC reduction. Run the calculator → for your specific number.

Verified compliant — May 2025 + August 2025

The Section 125 Preventive Care program described above was independently reviewed in 2025 by:

• HitesmanLaw P.A. (May 5, 2025) — 8-page formal legal opinion from Darcy L. Hitesman, J.D., a Super Lawyer-rated ERISA attorney with 35+ years in IRC § 125 practice, AV-rated since 1998, co-author of the national ERISA compliance manual. Concludes the program "satisfies applicable IRS requirements."
• CBIZ Advisors LLC (August 22, 2025) — top-7 U.S. accounting firm, 135,000+ clients. Independent review confirms compliance with IRC §§ 125, 105, 106, ERISA, ACA, and COBRA when operated per its provisions.
• $500,000 insurance-backed legal protection per enrolled employer + $10,000 per employee participant.

Read the full compliance authority page → · IRS.gov — Cafeteria Plans (Section 125) · 26 U.S. Code § 125

A real result from a real company

Affinity Hospice — multi-state hospice care · CFO Ariel Joudai (CPA) commissioned the CBIZ review before enrolling — saves $140,000+/year through this exact program structure. Read the full case study →

This isn't a projection — it's reported, on the public record, from operators whose own CPAs and attorneys reviewed the documentation before signing. Browse the full case study set →

The three IRC § 125 nondiscrimination tests in plain language

A Section 125 cafeteria plan must pass three separate nondiscrimination tests each plan year to maintain its tax-favored status. The plan administrator runs all three automatically; the operator's role is providing accurate census data once per year. Failing any one of the three triggers a re-classification of highly compensated or key employees' benefits as taxable income — but the plan administrator's pre-screen typically catches potential failures before the plan year starts.

The eligibility test (§ 125(g)(3)) requires that the plan not discriminate in favor of highly compensated employees (HCEs) regarding eligibility to participate. HCEs are defined as employees earning more than $135,000 (the 2024 threshold; indexed annually) or who own more than 5% of the company. The plan passes if the percentage of non-HCEs eligible to participate is at least 70% of the percentage of HCEs eligible.

The contributions and benefits test (§ 125(b)(1)(B)) requires that contributions and benefits available under the plan not discriminate in favor of HCEs. This is satisfied by offering the same salary-reduction limits, the same benefit menu, and the same employer-funded contribution rates to non-HCEs as to HCEs. The plan administrator structures the plan to satisfy this automatically.

The 25% concentration test for key employees (§ 125(b)(2)) requires that the qualified benefits provided to key employees (defined as 5%+ owners, officers earning more than $220,000, or employees owning more than 1%) not exceed 25% of the qualified benefits provided to all employees under the plan. Failing this test makes key employees' elections taxable; non-key employees are unaffected.

For the typical small-to-mid-cap operator with 10–500 employees and a wage distribution that doesn't concentrate heavily at the top, all three tests pass cleanly on the first run. The plan administrator runs them in January using the prior year's W-2 data and produces test results in the plan file before the plan year begins.

How to verify it yourself

Three primary sources, all public:

1. IRS.gov — Cafeteria Plans — the law in the IRS's own words.
2. 26 U.S. Code § 125 — the federal statute itself.
3. The Hitesman opinion + CBIZ review — both share-able PDFs, available on your free 15-minute analysis call.

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