What Is a POP Plan? The Simplest Section 125 Option Most Employers Skip the Paperwork For

Plain English Benefits · Updated November 6, 2026 · Education, not tax advice

A POP plan is a Premium-Only Plan, the simplest version of a Section 125 cafeteria plan. It allows employees to pay their share of health insurance premiums with pre-tax dollars, and that is the only benefit it covers. No flexible spending account, no dependent care assistance, no HSA election through the plan. Just premiums. It is the most common Section 125 arrangement at small employers because it requires the least administrative work, but it still requires a written plan document, and that is the step most small employers skip because their payroll vendor set up the pre-tax deduction and never mentioned the paperwork.

The IRS does not care that your payroll system has a checkbox for pre-tax health premiums. Without a written Section 125 plan document, those deductions are not legally pre-tax, and if the IRS audits your payroll, the deductions can be disallowed. The POP plan is the document that makes the tax treatment valid. We will walk through what a POP plan actually covers, what it leaves out, why the plan document matters even when everything runs smoothly, and when simple is enough versus when you need a fuller cafeteria plan.

What a POP Plan Covers

A Premium-Only Plan covers one thing: the employee's share of health insurance premiums. That includes medical, dental, and vision insurance premiums, as long as the coverage is offered through the employer and qualifies under the tax code. The employee elects to redirect part of their salary to pay those premiums before federal income tax and Social Security tax are calculated. The employer withholds the premium amount from pre-tax wages, pays the insurer, and the employee's taxable income on their W-2 is reduced by the amount redirected.

The pre-tax treatment applies to the employee's portion of the premium only. If the employer pays part of the premium, that employer contribution is already excluded from the employee's taxable wages and does not need to go through the cafeteria plan. The POP plan handles the employee's payroll deduction.

What a POP Plan Does Not Cover

A POP plan covers premiums only. It does not cover:

• Health FSA contributions
• Dependent care FSA contributions
• HSA contributions elected through the cafeteria plan
• Group term life insurance premiums above the $50,000 exclusion
• Accident or disability insurance premiums
• Any out-of-pocket medical expenses, copays, or deductibles

If you want employees to have access to any of those benefits on a pre-tax basis, you need a full cafeteria plan, not a POP. The distinction matters because many employers assume that once they have "a Section 125 plan," all benefits are automatically pre-tax. They are not. The plan document defines what is included, and a POP plan is defined narrowly by design.

For more on what the premium-only designation actually means and what it excludes, see Premium Only Means Premium Only: What Your Section 125 Plan Won't Cover. For a direct comparison of when a POP is enough and when you need the fuller plan, see POP Plan vs Full Cafeteria Plan: When Simple Is Actually Enough.

The Plan Document Requirement Employers Skip

Here is the part that catches small employers off guard. A POP plan still requires a written plan document. Section 125 of the Internal Revenue Code requires that every cafeteria plan be in writing, describe the benefits offered, specify who is eligible, and explain how elections work. That requirement applies to Premium-Only Plans just as it applies to plans with FSAs and HSAs. The fact that the POP is simpler does not eliminate the writing requirement.

Most small employers do not have this document because their payroll vendor set up the pre-tax health premium deduction as a standard feature, treated it as automatic, and never mentioned that the IRS requires a plan document to make it legal. The payroll system processes the deduction correctly, the tax savings show up on every paycheck, and the employer assumes everything is compliant because nothing has gone wrong. The document gap only surfaces during an IRS audit, a DOL investigation, or when the employer tries to add an FSA and discovers they never had a valid Section 125 plan to begin with.

The risk is not theoretical. If the IRS disallows the pre-tax treatment during an audit, the employer may owe back payroll taxes, the employee may owe back income taxes, and both may owe penalties and interest. The fix is straightforward—adopt a written plan document retroactive to the date you started offering pre-tax premiums—but the simpler fix is to adopt the document before you need it.

For what the IRS actually requires in that document and what is just template bloat, see Premium Only Plan Document: What the IRS Requires (Even When Employers Skip It).

Why Payroll Vendors Do Not Mention It

Payroll vendors configure the pre-tax health premium deduction as a default feature because almost every employer with a group health plan wants it. From the vendor's perspective, the deduction is a standard payroll setup task, not a benefits compliance project. The vendor is processing payroll, not administering a cafeteria plan, and they typically do not provide the plan document unless the employer specifically asks for it or pays for a benefits administration add-on service.

Some payroll platforms include a basic POP plan document as a downloadable template in their resource library. Many employers never see it because they do not know to look for it, and the onboarding process does not flag it as a required step. The pre-tax deduction starts running, the employer sees the tax savings, and the missing document is never discussed.

The responsibility for the plan document sits with the employer, not the payroll vendor. The employer is the plan sponsor under ERISA and the tax code, and the employer is the party the IRS will hold accountable if the document does not exist. The payroll vendor is a service provider. They may offer the document as a convenience, but they are not required to force the issue if the employer does not ask.

When a POP Plan Is Enough

A POP plan is enough when the only pre-tax benefit your employees need is health insurance premium deductions. If you offer medical, dental, and vision coverage, and employees pay part of the premium through payroll, a POP handles that cleanly. It is simple to adopt, requires minimal annual administration, and the nondiscrimination testing is straightforward because there are no contribution limits or coverage tiers to analyze beyond eligibility for the underlying health plan.

A POP works well for employers with fewer than 50 employees, stable group health coverage, and no interest in adding FSAs or HSAs in the near term. It keeps the cafeteria plan compliant without adding administrative complexity the business does not need.

When You Need More Than a POP

You need a full cafeteria plan instead of a POP if you want to offer:

• A health FSA for out-of-pocket medical expenses
• A dependent care FSA for childcare or elder care expenses
• An HSA with payroll contributions elected through the cafeteria plan
• Supplemental benefits like group term life or disability insurance on a pre-tax basis

Each of those benefits requires the cafeteria plan to include additional sections in the plan document, updated nondiscrimination testing, and more detailed election processes. A POP plan does not support any of them. If your employees are asking for an FSA or you are considering adding one, you will need to amend the plan or adopt a new full cafeteria plan document to replace the POP.

The amendment process is straightforward, but it is not automatic. You cannot simply start offering an FSA and assume the POP plan covers it. The plan document must be updated to describe the new benefit, and the updated document must be adopted before the new benefit goes live.

What Happens If You Never Adopted the Document

If you have been running pre-tax health premium deductions for years without a written POP plan document, you are operating a cafeteria plan without the required writing. The deductions are not valid under Section 125 until the plan document exists. The fix is to adopt a written plan document now, with an effective date that matches when you first started offering the pre-tax premiums. The IRS allows retroactive adoption to correct this kind of gap, as long as the plan operation has been consistent with what the document says.

You do not need to stop the payroll deductions while you get the document in place. You need to get the document signed and keep it on file. If you are working with a payroll vendor, ask them if they provide a POP plan document template. If they do not, a benefits attorney or third-party administrator can draft one, or you can use a standard template as long as it matches how your plan actually operates.

The cost of fixing the document gap is low. The cost of ignoring it is not.

FAQ

Can I add an FSA to a POP plan later?

You can add an FSA, but you cannot do it by simply starting to offer one. You need to amend the POP plan document to include the FSA as an additional qualified benefit, or adopt a new full cafeteria plan document that replaces the POP. The plan document must describe the FSA's contribution limits, eligible expenses, claims process, and use-it-or-lose-it rules before the FSA goes live. Adding the benefit without updating the document leaves the FSA outside the Section 125 framework, which means the contributions are not valid as pre-tax.

Does a POP plan require annual nondiscrimination testing?

Yes. Every Section 125 plan, including a POP, is subject to nondiscrimination testing under IRS regulations. The testing for a POP is simpler than the testing for a plan with FSAs because you are only testing eligibility and participation in the health plan, not contribution levels or coverage elections across different benefit tiers. Most small employers pass the testing automatically if the health plan is offered to all full-time employees on the same terms, but the testing still needs to be documented annually.

Is the POP plan the same thing as the group health plan?

No. The POP plan is the Section 125 cafeteria plan that makes the premium deductions pre-tax. The group health plan is the medical, dental, or vision insurance policy that provides the coverage. They are two separate programs. The health plan determines who is eligible for coverage and what the plan pays. The POP plan determines whether the employee's share of the premium can be deducted pre-tax. You need both, and each has its own plan document and compliance requirements.

Do I need a POP plan if the employer pays 100% of the health premium?

No. If the employer pays the entire premium and employees contribute nothing through payroll, there is no employee premium deduction to run through a cafeteria plan. The POP plan is only necessary when employees pay part of the premium and you want that employee contribution to be pre-tax. If the employer pays everything, the premium is already excluded from the employee's taxable wages, and no Section 125 plan is needed for that exclusion.

Running the Plan, Not Just Using It?

The POP plan is the simplest Section 125 option, but it still requires a written plan document, annual testing, and the procedural setup that makes pre-tax deductions legal. If you are the person responsible for payroll and benefits compliance, the Section 125 setup guide walks through the plan document, the nondiscrimination testing, and the two mistakes that catch almost every first-time plan sponsor—in plain English, with no vendor pitch.