Section 125 W-2 Reporting Requirements — What Goes Where

Section 125 deductions reduce Box 1 (federal taxable wages), Box 3 (Social Security wages), and Box 5 (Medicare wages) on the W-2. The annual total is also disclosed in Box 14 as informational. Here's the complete reporting layout.

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 →

How Section 125 elections appear on the W-2

Section 125 salary reductions affect three boxes on the year-end W-2 and one informational entry:

• Box 1 (Federal taxable wages): reduced by the year's pre-tax salary reduction amount. The employee's federal income tax calculation runs on this lower amount.
• Box 3 (Social Security wages): reduced by the year's pre-tax salary reduction amount, capped at the annual SSA wage base limit ($168,600 in 2024). Both employee and employer Social Security tax calculate on this lower amount.
• Box 5 (Medicare wages): reduced by the year's pre-tax salary reduction amount, no cap. Both employee and employer Medicare tax calculate on this lower amount.
• Box 14 (Other): typically labeled "S125" or "CAF125" or "Section 125 Wellness" with the cumulative annual pre-tax amount. This is informational only — it doesn't affect taxes paid or withheld, but it's how an employee's W-2 documents that the wage reduction occurred under a § 125 plan.

The employee's W-2 looks otherwise identical to what they received in years before enrollment. Federal tax filing is unchanged — they file Form 1040 using the W-2 wages as provided. The lower wage amounts in Boxes 1, 3, and 5 are the mechanism that delivers the FICA savings; no special W-2 instruction or coding from the operator is required.

For Form W-3 (the employer's annual W-2 transmittal): cumulative reduced wages flow through automatically from the individual W-2s. Form 941 (employer quarterly return) reflects the reduced FICA liability quarterly throughout the year — no year-end adjustment needed.

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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