What Is S125 in Box 14 or 14a on a W-2? Section 125 Pre-Tax Benefits Explained
S125 in Box 14 or 14a on a W-2 usually means Section 125 cafeteria plan deductions. These are commonly pre-tax benefit amounts for health insurance, dental, vision, FSA, HSA, or dependent care benefits. In many cases, the amount is informational and has already been handled in your taxable wage calculation.
That is why S125 can confuse employees. It may look like income, a deduction, or a tax code, but it usually explains why your W-2 taxable wages are lower than your gross pay or final pay stub total.
S125 usually means Section 125 cafeteria plan benefits. On older W-2 forms, employers often reported this in Box 14. On 2026 W-2 forms, the same “Other” information may appear in Box 14a. S125 is usually not extra income, and you usually should not subtract it again from your taxes unless your tax software or tax professional tells you to.
- Do not treat S125 as extra wages.
- Check whether Box 1 is lower than gross pay.
- Compare S125 with pre-tax deductions on your final pay stub.
- Do not manually deduct it again without guidance.
- Ask payroll which benefit created the amount if it looks wrong.
What Does S125 Mean on a W-2?
S125 stands for Section 125, also called a cafeteria plan. A cafeteria plan lets employees choose certain benefits, often with pre-tax payroll deductions. These benefits may include medical insurance premiums, dental coverage, vision coverage, flexible spending account contributions, health savings account contributions, and dependent care benefits.
When your employer lists S125 in Box 14 or Box 14a, the entry usually helps explain benefit deductions that were processed through payroll before taxable wages were finalized.
| W-2 Label | Common Meaning | What It Usually Refers To |
|---|---|---|
| S125 | Section 125 | Cafeteria plan pre-tax benefit deductions |
| SEC 125 | Section 125 | Same basic meaning as S125 |
| CAF / CAFE | Cafeteria plan | Pre-tax benefit plan under Section 125 |
| POP | Premium-only plan | Pre-tax insurance premium deductions |
Why S125 Appears in Box 14 or Box 14a
Box 14 has traditionally been used for “Other” information that does not fit cleanly into the main W-2 boxes. Employers may use it for payroll notes, local items, state programs, union dues, or pre-tax benefit information.
For 2026 W-2 forms, the IRS revised Box 14. Information previously reported in Box 14 “Other” is now reported in Box 14a, while Box 14b is used for Treasury Tipped Occupation Codes. So an older W-2 may show S125 in Box 14, while a newer W-2 may show S125 in Box 14a.
If you see S125 in Box 14 or 14a, your employer is likely showing Section 125 benefit information. The entry often helps explain wage differences rather than creating a new tax by itself.
Is S125 Taxable or Already Subtracted?
In many common cases, S125 amounts are already reflected in your taxable wage boxes. This means the amount may have reduced federal taxable wages before the W-2 was created.
For example, if you paid health insurance premiums through a Section 125 plan, those pre-tax deductions may reduce Box 1 federal taxable wages. Depending on the benefit, they may also affect Box 3 Social Security wages and Box 5 Medicare wages.
| Question | Short Answer | What to Check |
|---|---|---|
| Is S125 extra income? | Usually no | Compare Box 1 with gross wages |
| Is S125 already deducted? | Often yes | Check final pay stub YTD deductions |
| Do I deduct it again? | Usually no | Follow tax software or professional advice |
| Can it affect taxable wages? | Yes | Review Box 1, Box 3, and Box 5 |
Example: How S125 Can Lower Box 1 Wages
This simple example shows why S125 may appear on a W-2 even though it is not extra income.
In this example, the $3,000 may explain why Box 1 wages are lower than gross wages. The employee did not receive an extra $3,000. The amount represents pre-tax benefit deductions that affected taxable wages.
For a deeper wage breakdown, read our guide on how to calculate W-2 wages from a pay stub.
How S125 Affects Box 1, Box 3, and Box 5
S125 can affect different W-2 boxes depending on the benefit type. Many Section 125 deductions reduce federal taxable wages, and some may also reduce Social Security and Medicare wages. That is why your W-2 boxes may not match your full annual gross pay.
| W-2 Box | What It Shows | Possible S125 Impact |
|---|---|---|
| Box 1 | Federal taxable wages | May be lower because of pre-tax benefits |
| Box 3 | Social Security wages | May be reduced by some Section 125 benefits |
| Box 5 | Medicare wages | May be reduced by some Section 125 benefits |
| Box 14 / 14a | Other information | May show S125 amount for explanation |
For more payroll context, see pre-tax vs post-tax deductions, FICA on a pay stub, and Medicare tax on a pay stub.
S125 on a Pay Stub vs S125 on a W-2
A pay stub and W-2 do not show information in the same way. A pay stub shows pay period amounts and year-to-date totals. A W-2 summarizes the full year for tax reporting.
If you are checking year-to-date totals, read our guide on what YTD means on a pay stub.
Why S125 May Not Match Your Final Pay Stub Exactly
Sometimes the S125 amount in Box 14 or 14a does not match one single deduction line on your final pay stub. That does not always mean the W-2 is wrong.
- Your employer may group health, dental, vision, FSA, or dependent care deductions into one S125 total.
- Some deductions may have used different payroll codes during the year.
- Refunds, corrections, or mid-year benefit changes can affect totals.
- Box 14 and 14a entries are often informational, so formatting can vary by employer.
- One benefit may affect Box 1 while another may also affect Box 3 or Box 5.
Compare S125 with your final pay stub’s YTD pre-tax benefit totals, not only one paycheck. If the numbers still do not make sense, ask payroll for a benefit-by-benefit breakdown.
S125 vs Code DD, Code W, and Box 10
Many employees confuse S125 with other W-2 health and benefit codes. These items may all relate to benefits, but they are not the same.
| Code or Box | Where It Appears | Meaning |
|---|---|---|
| S125 / SEC 125 / CAF | Box 14 or 14a | Section 125 cafeteria plan or pre-tax benefit information |
| Code DD | Box 12 | Cost of employer-sponsored health coverage |
| Code W | Box 12 | Employer and employee HSA contributions through payroll |
| Box 10 | W-2 Box 10 | Dependent care benefits |
Do not assume S125, Code DD, Code W, and Box 10 are the same. They may all relate to benefits, but they are reported for different reasons.
What Category Should You Choose for S125 in Tax Software?
Tax software may ask you to enter Box 14 or Box 14a information exactly as shown on your W-2. If the software gives a specific option for S125, Section 125, Cafe 125, cafeteria plan, or pre-tax benefits, choose the closest matching option.
If no exact option exists, many employees may need to choose a general category such as “Other” or follow the software’s instructions. The important part is this: do not manually reduce Box 1 wages again unless the software or a qualified tax professional tells you to.
Enter the W-2 as received. If Box 14 or 14a asks for a label, enter the label shown by your employer, such as S125, SEC 125, CAF, or CAFE. Do not guess a different tax treatment just because the code looks unfamiliar.
Does S125 Affect State Taxes?
Federal treatment and state treatment may not always be identical. Some states, local tax systems, or employer payroll systems use Box 14 or Box 14a for special reporting. You may also see state-specific labels related to Section 125 deductions.
If your W-2 shows a state-specific version of S125, or if your tax software asks for a state category, check your state tax instructions, tax software help text, or payroll department before changing the amount.
Do You Need to Enter S125 on Your Tax Return?
In many cases, S125 in Box 14 or 14a is informational. If the amount was already handled in taxable wage calculations, you usually do not deduct it again separately.
The safest approach is to enter the W-2 exactly as received. If your software asks for Box 14 or 14a details, enter the label and amount shown. If the software does not require the amount for your situation, follow its instructions.
I Never Signed Up for a Cafeteria Plan. Why Is S125 There?
This is common. Employees may not remember enrolling in something called a “cafeteria plan” because employers often use everyday names such as health insurance, dental insurance, vision insurance, FSA, HSA, or dependent care benefits.
The payroll system may still report those benefits under Section 125 because that is the tax structure behind many pre-tax benefit deductions.
When S125 Might Need Payroll Review
Most S125 entries are normal, but there are times when you should ask payroll to review the amount.
Contact payroll if:
- The S125 amount is much higher than your final pay stub YTD deduction total.
- You never had health, dental, vision, FSA, HSA, or dependent care benefits.
- Box 1 wages do not make sense after comparing gross pay and pre-tax deductions.
- Your W-2 shows both S125 and another confusing benefit code.
- You think the amount was entered twice or assigned to the wrong box.
- Your tax software asks for a state-specific category you do not understand.
Payroll Message You Can Send
Copy this message:
Hi, I noticed an S125 amount in Box 14/14a on my W-2. Can you confirm which benefits created this amount, whether it was already subtracted from Box 1 wages, whether it affected Box 3 or Box 5, whether it has any state-specific treatment, and whether it matches my final pay stub YTD deduction totals? Thank you.
How to Check S125 Against Your Pay Stub
- Open your final pay stub for the year.
- Find pre-tax deductions such as medical, dental, vision, FSA, HSA, or dependent care.
- Check the YTD total for those deductions.
- Compare the total with S125 in Box 14 or Box 14a.
- Review Box 1 wages against gross pay and pre-tax deductions.
- Check Box 3 and Box 5 if Social Security or Medicare wages look different.
- Ask payroll if the numbers do not line up.
If you are still learning the layout, start with our guide on how to read a pay stub and our breakdown of what is on a pay stub.
Quick Recap
S125 in Box 14 or Box 14a usually means Section 125 cafeteria plan information. It often relates to pre-tax benefits such as health, dental, vision, FSA, HSA, or dependent care deductions. The amount is usually not extra income. It may already be reflected in taxable wage boxes such as Box 1, and in some cases Box 3 and Box 5. If it looks wrong, compare it with your final pay stub and ask payroll which benefit created the amount.
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Create a W-2 FormFrequently Asked Questions
S125 usually means Section 125 cafeteria plan deductions, often connected to pre-tax employee benefits.
Usually, S125 is not extra taxable income. It often shows pre-tax benefit amounts that were already handled in the W-2 wage calculation.
In many cases, yes. Section 125 pre-tax benefits may already reduce Box 1 federal taxable wages.
Employers use Box 14, or Box 14a on newer W-2 forms, to report other helpful payroll information. S125 may be shown there to explain pre-tax benefit deductions.
Yes, in most payroll contexts. S125, SEC 125, CAF, and Cafe 125 usually point to Section 125 cafeteria plan benefits.
If your software has S125, Section 125, cafeteria plan, or pre-tax benefit options, choose the closest match. If not, follow the software instructions or choose a general “Other” category when appropriate.
It can depend on the state and the benefit. If your W-2 has state-specific wording, check your state tax instructions, software help, payroll department, or tax advisor.
No. S125 usually reports Section 125 pre-tax benefit information. Code DD reports the cost of employer-sponsored health coverage in Box 12.
Your employer may group several pre-tax benefits into one S125 amount, or payroll corrections and benefit changes may affect the year-end total.
Ask which benefits created the amount, whether it was already subtracted from Box 1, whether it affected Box 3 or Box 5, and whether it matches your final pay stub YTD totals.
Related Reading
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