Cafeteria Plan (Section 125): How It Works, Benefits, and Compliance Requirements

6/6/2026

Nearly every employer that deducts health premiums pre-tax is operating a Section 125 cafeteria plan — and a meaningful number of them do not have a written plan document, have never run nondiscrimination testing, and allow mid-year election changes that the rules do not permit.

Quick answer: A cafeteria plan is the mechanism that allows employees to pay for qualified benefits with pre-tax dollars. It requires a written plan document, must satisfy nondiscrimination tests, and imposes a strict irrevocability rule — elections generally cannot be changed mid-year except on account of a permitted change in status.

What a Cafeteria Plan Is

A cafeteria plan under Internal Revenue Code Section 125 is a written plan allowing employees to choose between cash compensation and qualified benefits, with amounts directed to qualified benefits excluded from gross income.

Without a cafeteria plan, an employee choosing benefits over cash would be taxed on the cash they could have received — the constructive receipt doctrine. Section 125 is the statutory exception that makes pre-tax benefit elections possible.

The Three Plan Types

Type	What It Covers	Typical Use
Premium Only Plan (POP)	Employee share of health, dental, and vision premiums only	The most common and simplest arrangement
Flexible Spending Arrangement (FSA)	Health FSA and dependent care FSA	Adds reimbursement accounts to the POP
Full flex plan	Employer credits allocated across a menu of benefits	Larger employers with broad benefit menus

Qualified and Non-Qualified Benefits

Permitted: accident and health coverage, health FSAs, dependent care assistance, group term life insurance (with amounts over the exclusion threshold producing imputed income), disability coverage, adoption assistance, HSA contributions, and certain other benefits.

Not permitted: long-term care insurance (with limited exceptions), scholarships, educational assistance, employer-provided meals and lodging, transportation fringe benefits, and — importantly — deferred compensation, with narrow exceptions.

Offering a non-qualified benefit through a cafeteria plan can disqualify the entire plan, making all elections taxable for all participants. This is the disproportionate consequence that makes plan design worth getting right.

The Irrevocability Rule

This is the compliance issue HR encounters most. Elections made before the start of the plan year are generally irrevocable for the plan year. An employee who elects $2,000 into a health FSA in December cannot change their mind in March because circumstances changed — unless a permitted change-in-status event applies and the plan document allows it.

Permitted change-in-status events

• Legal marital status: marriage, divorce, legal separation, annulment, death of spouse
• Number of dependents: birth, adoption, placement for adoption, death of a dependent
• Employment status: termination or commencement of employment for the employee, spouse, or dependent; a change in worksite; a change in employment status affecting eligibility
• Dependent eligibility: a dependent satisfying or ceasing to satisfy eligibility requirements, such as an age limit
• Residence: a change affecting plan eligibility

Other permitted change events

• Significant cost or coverage changes (not available for health FSAs)
• HIPAA special enrollment rights
• Entitlement to or loss of Medicare or Medicaid
• A judgment, decree, or order such as a QMCSO
• FMLA leave
• Marketplace enrollment changes in defined circumstances

The consistency rule

A permitted event does not authorize any change — only a change that is consistent with the event. An employee whose child ages off coverage may drop dependent coverage; they may not increase their dependent care FSA election because they now have more expenses elsewhere.

Two additional constraints HR frequently misses: the change must generally be requested within the period specified in the plan document (commonly 30 days), and the plan document must actually permit the change — the regulations permit an employer to be more restrictive than the maximum the rules allow.

Nondiscrimination Testing

Cafeteria plans must not discriminate in favor of highly compensated or key employees. Three tests apply to the plan itself:

Test	What It Examines
Eligibility	Whether the plan is available to a non-discriminatory group of employees
Contributions and benefits	Whether contributions and benefits are available on a non-discriminatory basis and utilization is comparable
Key employee concentration	Whether key employees receive more than 25% of the aggregate nontaxable benefits under the plan

Component benefits — health FSAs, dependent care FSAs, and group term life — carry their own separate tests. Dependent care FSAs in particular fail regularly at employers with a high-earning population, because utilization skews toward higher earners.

Consequences of failure fall on highly compensated or key employees, who lose the exclusion and are taxed on the benefits received. Test early in the plan year, not at year end, so there is time to adjust.

Required Plan Documentation

A cafeteria plan must be in writing and adopted before the first day of the plan year to which it applies. The document must specify:

• Eligibility rules
• Available benefits
• Election procedures and timing
• The manner in which employer contributions may be made
• The plan year
• Maximum employer contributions and, for FSAs, maximum salary reduction amounts
• The permitted change-in-status events the plan will recognize

Operating without a written document is a live risk with disproportionate consequences: if there is no valid plan, the salary reductions are not excludable and all participant elections become taxable. Many small employers deducting premiums pre-tax have never adopted a document at all.

Health FSA Specifics

• Annual limit is indexed by the IRS — insert the current-year figure.
• Uniform coverage rule: the full annual election must be available from day one, even though contributions accrue over the year. If an employee spends the full amount in January and terminates in February, the employer generally absorbs the loss.
• Use-or-lose, modified by an optional grace period or an optional carryover — a plan may offer one, not both.
• Run-out period for submitting claims incurred during the plan year, if the plan provides one.
• HSA interaction: a general-purpose health FSA destroys HSA eligibility. A limited-purpose FSA does not.
• COBRA: health FSAs are generally subject to COBRA continuation, with a limited exception where the remaining benefit is less than the remaining premiums.

The Eight Most Common Employer Errors

1. Operating without a written plan document, or with one that was never updated.
2. Allowing mid-year election changes without a permitted event or without consistency.
3. Not running nondiscrimination testing at all.
4. Failing to apply the uniform coverage rule to health FSAs.
5. Offering both a grace period and a carryover.
6. Offering a general-purpose FSA alongside an HSA without explaining the eligibility conflict.
7. Missing the FMLA coordination rules for continuation and reinstatement of elections.
8. Failing to adopt the plan document before the plan year begins — retroactive adoption is not permitted.

Frequently Asked Questions

Do we need a written plan document to deduct premiums pre-tax?

Yes. Pre-tax premium deduction is a Section 125 arrangement and requires a written cafeteria plan document adopted before the plan year.

Can an employee change their FSA election mid-year?

Only on account of a permitted change-in-status event, where the change is consistent with the event and the plan document allows it. Note that cost and coverage change rules do not apply to health FSAs.

What happens if the plan fails nondiscrimination testing?

Highly compensated or key employees lose the exclusion and are taxed on the benefits received. Other participants are unaffected.

Can we offer both a grace period and a carryover?

No. A health FSA may offer one or the other, not both.

Are cafeteria plan contributions exempt from payroll taxes?

Generally yes — salary reductions for qualified benefits are excluded from federal income tax, Social Security, and Medicare tax, producing employer FICA savings as well.

Get Section 125 Right at the Design Stage

Cafeteria plan errors are structural. They are set at plan design and document adoption, and they replicate silently across every participant until someone tests them.

The Cafeteria Plan Administration Training Program covers plan design, documentation, election rules, testing, and FSA administration. Benefits professionals should pair it with the COBRA Training & Certification Program for the continuation coordination points.

👉 See the Cafeteria Plan Training Program →

Additional resources: Cafeteria Plan FAQs | Cafeteria Plan Compliance Requirements | Glossary of Cafeteria Plan Terms