If you see “SEC 125,” “Section 125,” or “Cafe 125” on your W-2, it means your employer runs a cafeteria plan and you paid for certain benefits with pre-tax dollars during the year. Those pre-tax deductions lowered the wages your employer reported in Box 1, which reduced the federal income tax, Social Security tax, and Medicare tax you owed. The notation itself isn’t taxable income and doesn’t require any action on your tax return; it’s a label explaining why your reported wages are lower than your gross pay.
How Section 125 Changes the Numbers on Your W-2
Section 125 of the Internal Revenue Code lets employers set up a written plan where employees choose between taking full salary in cash or redirecting part of it toward qualified benefits before taxes are calculated.1Office of the Law Revision Counsel. 26 USC 125 – Cafeteria Plans The money you route into those benefits never counts as taxable income.
The clearest place you see this is Box 1 (“Wages, Tips, Other Compensation”). Box 1 is lower than your actual gross pay by the amount you contributed pre-tax to qualified benefits. That is the figure you carry over to your federal return, so the reduction directly lowers your tax bill.
Section 125 deductions also reduce Box 3 (“Social Security Wages”) and Box 5 (“Medicare Wages and Tips”). Box 3 is capped at the Social Security wage base, which is $184,500 for 2026.2Social Security Administration. Contribution and Benefit Base Box 5 has no cap. Because both boxes reflect the lower wages, you paid less in payroll taxes throughout the year.
Many employers put the total Section 125 amount in Box 14 (“Other”), often with a shorthand tag like “Cafe 125” or “S125.” Box 14 is informational only; it doesn’t feed into any tax calculation, but it helps you reconcile why Box 1 is smaller than your gross pay.
A few Section 125 benefits also trigger specific codes elsewhere on the form. The total cost of employer-sponsored group health coverage, meaning both the employer’s share and yours, shows up under Code DD in Box 12 and is not taxable. Health Savings Account contributions run through payroll appear under Code W. Pre-tax amounts you routed to a Dependent Care FSA show up in Box 10.
What Benefits Your Section 125 Dollars Paid For
The most common item inside a Section 125 amount is your share of employer-sponsored health, dental, or vision insurance premiums. If your employer deducts insurance premiums pre-tax, you have what’s called a Premium Only Plan, even if nobody in your HR office uses that name.
A Health Flexible Spending Account also flows through Section 125. It lets you set aside pre-tax money for out-of-pocket medical costs your insurance doesn’t cover, such as deductibles, copays, and prescriptions. For 2026 the contribution limit is $3,400.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
A Dependent Care FSA covers child care for children under 13 and care for other qualifying dependents, including daycare, preschool, and after-school programs.4Internal Revenue Service. Publication 503 – Child and Dependent Care Expenses For 2026 the household maximum is $7,500, or $3,750 if married filing separately, up from the prior $5,000 cap.5FSAFEDS. New 2026 Maximum Limit Updates
Health Savings Account contributions made through payroll get the same pre-tax treatment. For 2026 the HSA limits are $4,400 for self-only coverage and $8,750 for family coverage, with an additional $1,000 catch-up contribution allowed if you’re 55 or older.6Internal Revenue Service. IRS Notice 26-05 – Expanded Availability of Health Savings Accounts
So when you look at your Section 125 total on the W-2, it’s usually some combination of these four things: insurance premiums, a Health FSA, a Dependent Care FSA, and HSA contributions. Your pay stubs and benefits summary should break down which is which.
What You Actually Saved
The savings from Section 125 are immediate and automatic. Say you earn $60,000 and contribute $3,400 to a Health FSA through the plan. Your taxable wages drop to $56,600. You save federal income tax at your marginal rate on that $3,400, plus 6.2% in Social Security tax and 1.45% in Medicare tax. For someone in the 22% bracket, that single election saves roughly $1,007 across the year. Your employer also skips its matching payroll tax on the same amount.
The same math applies to every dollar in your Section 125 total, which is why the Box 1 number on your W-2 is worth understanding rather than just accepting.
The Social Security Trade-Off
Because Section 125 deductions reduce your Social Security wages, they also reduce the earnings the Social Security Administration records for you that year. Your future retirement benefit is calculated on your highest 35 years of earnings, so participating in a cafeteria plan slightly lowers the earnings history feeding that formula.
For most workers the impact is small, and the immediate tax savings outweigh the marginal reduction in future benefits. If you’re early in your career with relatively low earnings, the trade-off is worth being aware of, but it isn’t a reason to opt out for most people.
How States Treat the Same Deductions
Most states follow the federal rules and exclude Section 125 amounts from state income tax. Some don’t fully conform. New Jersey taxes health insurance premiums that are pre-tax at the federal level, and several states, including California and New Jersey, do not recognize HSA contributions as tax-free. If you live in a state that doesn’t conform, your state wages on the W-2 may be higher than your federal Box 1 figure. That mismatch is expected, not an error.
Why You Can’t Just Change Your Election
Once you make Section 125 elections during open enrollment, they’re locked for the plan year. You can’t raise, lower, or drop the deductions because you changed your mind.7eCFR. 26 CFR 1.125-4 – Permitted Election Changes
Mid-year changes are allowed only after a qualifying life event, and the change has to be consistent with that event. Qualifying events fall into a few categories:7eCFR. 26 CFR 1.125-4 – Permitted Election Changes
- Change in marital status, including marriage, divorce, legal separation, annulment, or death of a spouse
- Change in the number of dependents, including birth, adoption, placement for adoption, or death of a dependent
- Change in employment status for you or your spouse, including starting or ending a job, moving between full-time and part-time, unpaid leave, or a strike
- Change in dependent eligibility, such as a child aging out of coverage or gaining coverage under another plan
Consistency matters. If you have a baby, you can add the child to your health plan and raise your Dependent Care FSA, but you can’t use the birth as a reason to drop dental coverage. Plan administrators check each request against the regulations, and inconsistent changes get denied.