Employee POP: How It Changes Your W-2, Paycheck, and What Happens Mid-Year

Plain English Benefits · Updated September 28, 2026 · Education, not tax advice

Short Answer

An employee premium only plan (POP) lets you pay for health insurance premiums with pre-tax dollars, which lowers your taxable income and typically reduces what you owe in federal and state income tax and FICA. On your W-2, Box 1 will be lower than your actual gross pay by the amount you put toward premiums. If you drop coverage mid-year, you lose the pre-tax benefit going forward—your taxable income goes up for the rest of the year, but you don't owe back-taxes on the months you already had coverage. January paychecks often look backwards because payroll systems reset the year-to-date counters but the deduction hits before you've built up enough taxable income to see the benefit clearly.

What Employee POP Actually Means

A premium only plan is the simplest form of a Section 125 cafeteria plan. It does one thing: it lets you pay for employer-sponsored health, dental, or vision insurance premiums before taxes are calculated instead of after.

That pre-tax treatment is what the "POP" line on your paystub represents. You elected coverage during open enrollment, your employer set up the plan under Section 125, and now your premium comes out before the IRS counts your income for the year.

Most employees never notice the plan exists. You see "POP EE" or "Cafe 125" on your paystub, your take-home is slightly higher than it would be without the plan, and that's the extent of the interaction. The complexity shows up in three specific scenarios: reading your W-2 at tax time, dropping coverage partway through the year, or trying to make sense of your first paycheck in January.

How Employee POP Changes Your W-2

Your W-2 reports your taxable income to the IRS. When you participate in a POP, the premiums you paid pre-tax are excluded from several boxes on that form.

Box 1 (Wages, tips, other compensation) will be lower than your actual gross pay by the total amount you contributed toward premiums through the POP during the year. If you earned $50,000 in gross wages and paid $4,000 in premiums pre-tax, Box 1 shows $46,000. That $4,000 never gets taxed as income.

Box 3 (Social Security wages) also excludes your pre-tax premium contributions. The same $4,000 reduction applies. You pay Social Security taxes on the smaller amount. Box 5 on your W-2 works the same way—the pre-tax premium amount reduces what shows up there.

Box 16 (State wages) typically mirrors Box 1 in most states—your state taxable income is also reduced by the pre-tax premium amount. A few states don't allow the exclusion, but that's rare.

What this means practically: if you're used to looking at your final December paystub to estimate your W-2, the numbers won't match. Your year-to-date gross on the paystub is the actual money your employer paid you. Your W-2 Box 1 is the taxable subset after the POP deduction is removed. Both numbers are correct—they're just measuring different things.

For more on how this pre-tax treatment shows up on your paystub throughout the year, see what POP EE means on your paystub.

What Happens If You Drop Coverage Mid-Year

Dropping employer-sponsored health coverage partway through the plan year ends your participation in the POP going forward. You don't owe back-taxes on the months you were already covered, but you lose the pre-tax benefit for any remaining paychecks in the year.

Here's the mechanic: Section 125 plans lock in your election at the start of the plan year, and you generally can't change it unless you have a qualifying life event—marriage, birth of a child, loss of other coverage, or a change in employment status that affects eligibility. Losing eligibility for your employer's plan (because you went part-time, for example) or experiencing another qualifying event lets you drop coverage mid-year.

Once you drop, your paycheck changes immediately. The premium deduction stops, which sounds like good news—more take-home, right? But your taxable income goes up by the same amount. If your premium was $300 per paycheck, that $300 now gets taxed. Depending on your bracket and how your employer withholds, you may see a smaller increase in take-home than you expected, or in some cases your take-home might actually drop if withholding adjusts aggressively.

The months you were covered stay pre-tax. If you paid $2,400 in premiums from January through June and then dropped coverage in July, your W-2 at year-end will exclude that $2,400 from Box 1. July onward, the premium deduction is gone and your taxable wages reflect your full gross pay.

One trap: if you drop employer coverage and pick up a spouse's plan or go to the marketplace, you can't retroactively make those new premiums pre-tax through your old employer's POP. The plan only covers premiums paid to your employer for employer-sponsored coverage. Once you're off the employer plan, the POP stops helping.

Why Your January Paycheck Math Looks Backwards

January paychecks confuse people because the year-to-date numbers reset to zero, but the deductions hit in full from day one. If you're paid biweekly and your first check of the year includes a $300 pre-tax premium deduction, your taxable income for that single check might be close to zero or even negative in the payroll system's calculation, which makes the withholding look wrong.

Here's what's happening: your gross pay for the first check might be $1,800. The $300 POP deduction brings your taxable wages down to $1,500 for that pay period. But if your employer's payroll system calculates withholding based on annualizing that one check, it assumes you'll earn $1,500 every two weeks for the whole year, projects your annual income, and withholds accordingly. That projected amount is much lower than your actual expected annual income, so withholding is light.

By February or March, the year-to-date numbers grow and the withholding stabilizes. The first few checks just look strange because the ratio of deduction to gross pay is temporarily high.

The opposite problem can also happen: some payroll systems front-load withholding in January to avoid under-withholding for the year. You might see a larger chunk of tax taken out of your first check than you expect, even though your taxable income is lower. That evens out over subsequent paychecks, but it's jarring if you're not expecting it.

If your January take-home is noticeably different from December and nothing else changed, check your paystub's year-to-date withholding column. If it reset to zero, you're seeing the annual restart effect. It's not a mistake—it's how the calendar and the deduction interact.

Other Situations Employees Ask About

What if I get a raise mid-year? Your premium amount is locked in at open enrollment, so the dollar amount of the POP deduction stays the same even if your pay goes up. The pre-tax benefit doesn't scale with your raise—it's a fixed deduction per pay period based on the coverage you elected.

Can I stop the POP deduction without dropping coverage? No. If you want to keep the insurance, the premium has to come out somewhere, and if your employer offers a POP, that deduction is pre-tax by default. You can't opt out of the tax benefit and pay premiums after-tax unless you're ineligible for the Section 125 plan for some reason (2% S-corp shareholders, for example, can't participate).

Does the POP deduction affect my unemployment benefits or Social Security later? Maybe, slightly. Unemployment benefits in most states are based on your gross wages before the POP deduction, so the plan typically doesn't reduce your benefit. Social Security retirement benefits are based on your taxable Social Security wages (W-2 Box 3), which are reduced by the POP. The impact is small—most people don't notice a difference in their eventual benefit—but it exists.

What if my employer stops offering the plan? If your employer drops the Section 125 POP, your premiums go back to being deducted after-tax. Your take-home goes down because you're now paying the same premium amount but also paying taxes on that money first. The employer has to give you notice before making that change, but there's no requirement to keep offering the plan indefinitely.

FAQ

What does "employee POP" mean on my paystub?

It's the line item showing your pre-tax premium deduction under your employer's premium only plan. The amount listed is what you're paying toward health, dental, or vision insurance before taxes are calculated. Some employers label it "POP EE," others use "Cafe 125" or "Sec 125"—they all mean the same thing.

Do I get the POP money back at tax time?

No. The money went to pay your insurance premium. The benefit isn't a refund—it's that you never paid income tax or FICA on that money in the first place. Your W-2 will show a lower taxable income, which typically means you owe less in taxes overall, but the premium dollars themselves are gone.

Can I change my POP deduction amount mid-year?

Only if you have a qualifying life event—marriage, divorce, birth or adoption of a child, loss of other coverage, or a change in employment status. Outside of those events, your election is locked in until the next open enrollment. You can't just decide in March that you want to adjust your coverage.

What happens to my POP deduction if I leave my job?

The deduction stops when your employment ends. If you elect COBRA continuation coverage, those premiums are paid after-tax—you can't run them through your old employer's Section 125 plan because you're no longer an employee. Your W-2 for the year will reflect the pre-tax premiums you paid up until your termination date.

Running the Plan, Not Just Using It?

If you're the person on the employer side trying to set up or administer a premium only plan, the Section 125 setup guide walks through the plan document, payroll integration, and the two traps that catch almost everyone—in plain English.