What Are Taxable Wages on a Pay Stub? Formula, Examples and W-2 Box Differences
By ePaystubs Editorial Team | Updated June 22, 2026 | Verified against IRS W-2 Instructions
Taxable wages are the portion of your earnings actually subject to a given tax. They start with your gross pay, subtract pre-tax deductions like health insurance and 401(k), and add back any taxable items like group-term life insurance. Because different taxes follow different rules, you do not have one taxable-wage figure, you have several. That is why your W-2 shows different amounts in Boxes 1, 3, 5, and 16, and why none of them match your gross salary.
Few payroll questions cause more confusion than this one, especially at tax time when a W-2 arrives showing numbers that do not match the final pay stub or the salary on the offer letter. The short version: that mismatch is almost always correct. This guide explains what taxable wages really are, why your W-2 carries four different wage figures, and how to reconcile every one of them back to your pay stub.
- Why W-2 doesn't match
- What taxable wages means
- The wage base
- The four W-2 figures
- Box 16 higher than Box 1
- State treatment table
- What raises taxable wages
- Full worked example
- Verify your own
Why Your W-2 Doesn't Match Your Pay Stub (and Why That's Correct)
Every tax season, payroll departments field the same worried question: why is the wage figure on my W-2 different from my final pay stub, and different again from my salary? The reassuring answer is that, except in the rare case where you had zero pre-tax deductions all year, your final pay stub and your W-2 are not supposed to match.
The reason is what each document measures. Your pay stub shows gross pay, which is everything you earned. Your W-2 shows taxable wages, which is only the portion each tax actually applies to after pre-tax deductions are removed. A gap between the two is not an error. It is the expected result of your pre-tax benefits working exactly as designed.
What "Taxable Wages" Actually Means
Most explanations stop at "gross pay minus deductions." That is only half the picture. Taxable wages move in two directions:
A few other items reduce taxable wages because they were never taxable to begin with. Reimbursed business mileage, workers' compensation, and certain other non-cash items lower the wages that appear on your W-2 below your gross earnings. One recent change worth noting: moving expense reimbursements are now subject to FICA tax. For how reimbursements and fringe benefits are coded and treated, see pay stub deduction codes. For the difference between deductions taken before and after tax, see pre-tax versus post-tax deductions.
The Taxable Wage Base: Why One Tax Stops and Another Doesn't
Here is a piece most guides skip. Different taxes have different wage bases, which is a cap on how much of your income that particular tax applies to. Once your year-to-date earnings cross a tax's wage base, that tax stops for the rest of the year, even though others keep going. This is a major reason your taxable-wage figures differ from each other.
| Tax | 2026 Wage Base | What Happens Above It |
|---|---|---|
| Social Security (OASDI) | $184,500 2026 | Tax stops for the rest of the year once YTD wages cross it |
| Medicare | No cap | Never stops; applies to every dollar of covered wages |
| FUTA (employer-paid) | $7,000 | Employer stops paying after the first $7,000 per employee |
| State unemployment (SUTA) | Varies by state | Ranges from $7,000 to over $65,000 depending on the state |
The Four Taxable-Wage Figures on Your W-2
This is the heart of the confusion. One gross salary produces four different taxable-wage numbers on your W-2, because each box follows different rules about what to subtract.
| W-2 Box | What It Shows | What Reduces It | Typical Size |
|---|---|---|---|
| Box 1 Federal |
Federal taxable wages | All pre-tax deductions including traditional 401(k), plus nontaxable items | Usually the lowest |
| Box 3 Social Security |
Social Security wages | Section 125 only (health, FSA, HSA). 401(k) does NOT reduce it. Capped at $184,500. | Higher than Box 1 |
| Box 5 Medicare |
Medicare wages | Same as Box 3, but no wage cap | Often the highest |
| Box 16 State |
State taxable wages | Varies by state; usually tracks Box 1 but not always | Equal to or higher than Box 1 |
For a typical mid-income worker who contributes to a traditional 401(k), the relationship is: Box 1 is lower than Boxes 3 and 5, which are equal to each other. Box 16 usually matches Box 1, but as the next section shows, not in every state. The most important thing to understand: these boxes do not need to match each other or add up to anything. Each one answers a different tax's question.
Why Box 16 (State) Can Be Higher Than Box 1 (Federal)
This is one of the most common and least-explained sources of W-2 confusion. People expect their state wages to match their federal wages, and when Box 16 comes in higher than Box 1, they assume a mistake. It usually is not.
The cause is that states define taxable wages differently than the federal government. The clearest example is retirement contributions:
| State Approach | How 401(k) Is Treated | Result on W-2 |
|---|---|---|
| Pennsylvania | Taxes 401(k) contributions at the state level, even though they are excluded federally | Box 16 is HIGHER than Box 1 |
| Ohio | Follows federal rules and exempts 401(k) contributions | Box 16 matches Box 1 |
So a Pennsylvania worker who contributes to a 401(k) will see state wages in Box 16 that exceed federal wages in Box 1, because Pennsylvania taxed the contribution that the federal government did not. A worker in Ohio doing the same thing will see the two boxes match. Moving between states mid-year produces the same kind of gap, since each state applies its own rules to the portion of the year you worked there.
How Different States Treat Your Pre-Tax Contributions
Whether your Box 16 matches or exceeds your Box 1 comes down to how your specific state treats two things: retirement contributions and HSA contributions. Here is the practical reference.
Retirement Contributions (401k and similar)
| State Treatment | Examples | Effect on Box 16 |
|---|---|---|
| Taxes 401(k) contributions at the state level | Pennsylvania | Box 16 is higher than Box 1 by your 401(k) amount |
| Taxes some plans but not 401(k) | New Jersey (taxes 403(b), 457, and others, but exempts 401(k)) | Depends on your specific plan type |
| Follows federal rules, exempts 401(k) | Ohio and most states | Box 16 matches Box 1 |
| No state income tax at all | Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming | Box 16 is blank or absent |
New Jersey is a useful example of the nuance. The state taxes contributions to most deferred-compensation plans, including 403(b) and 457 plans, but it does specifically exempt 401(k) contributions. So a New Jersey worker with a 403(b) sees a higher Box 16, while a New Jersey worker with a 401(k) does not. The plan type matters, not just the state.
HSA Contributions
The Items That RAISE Your Taxable Wages
Almost every explanation of taxable wages focuses on what lowers them. But some items push your taxable wages above your gross pay, and they surprise people who never received the money in cash.
The most common is group-term life insurance, or GTL. When your employer provides life insurance coverage above $50,000, the IRS treats the value of the excess coverage as imputed income. That value is added to your taxable wages in Boxes 1, 3, and 5, and it also appears separately in Box 12 under Code C. The $50,000 threshold is unchanged for 2026. You never see this amount as cash, but it raises the wages you are taxed on. Other taxable fringe benefits, like personal use of a company car or certain non-cash awards, work the same way.
For the full group-term life calculation, including the IRS premium table that sets the imputed-income amount by age, see pay stub deduction codes.
A Complete Worked Example: One Salary, Four Different Wage Figures
Here is how all four boxes diverge from a single gross figure. This example uses one employee who works in Pennsylvania, contributes to a traditional 401(k), and has employer life insurance over $50,000.
The setup:
- Gross pay for the year: $72,000
- Group-term life imputed income: $200 (employer coverage over $50,000)
- Traditional 401(k): $4,000
- Health insurance, Section 125: $3,000
- HSA contribution: $1,200
- Work state: Pennsylvania (taxes 401(k) contributions)
| Calculation | Box 1 Federal |
Box 3 Soc. Sec. |
Box 5 Medicare |
Box 16 PA State |
|---|---|---|---|---|
| Gross pay | $72,000 | $72,000 | $72,000 | $72,000 |
| Add GTL imputed income | +$200 | +$200 | +$200 | +$200 |
| Subtract health (Section 125) | -$3,000 | -$3,000 | -$3,000 | -$3,000 |
| Subtract HSA | -$1,200 | -$1,200 | -$1,200 | -$1,200 |
| Subtract traditional 401(k) | -$4,000 | $0 | $0 | $0 |
| Taxable wages | $64,000 | $68,000 | $68,000 | $68,000 |
Same employee, same year, four different wage figures, every one of them correct. Box 1 is lowest because the 401(k) reduces federal taxable wages. Boxes 3 and 5 are higher because the 401(k) does not reduce Social Security or Medicare wages. And Box 16 matches Boxes 3 and 5 rather than Box 1, because Pennsylvania taxes the 401(k) contribution that the federal government exempted. The same worker in Ohio would have a Box 16 of $64,000, matching Box 1 instead.
How to Verify Your Own Taxable Wages
You can reconcile your W-2 to your pay stub yourself using the year-to-date totals on your final stub of the year. Work through it box by box:
Start with your Gross Pay YTD from your final pay stub. To find Box 1, subtract all your pre-tax deductions for the year, including your traditional 401(k), health, dental, vision, FSA, and HSA, then add any GTL imputed income. To find Boxes 3 and 5, start from gross again and subtract only the Section 125 items, leaving the 401(k) in, then add the GTL. The results should equal the matching boxes on your W-2.
Your YTD figures are the starting point for all of this, so it helps to know how to read them. For that, see what YTD means on a pay stub. To confirm which of your deductions are pre-tax versus post-tax before you subtract them, see pre-tax versus post-tax deductions. If your numbers do not reconcile after working through the steps, contact your payroll department. If you need a clear record that itemizes taxable and nontaxable lines, you can generate a pay stub that lays them out plainly.
Frequently Asked Questions
Taxable wages are the portion of your earnings subject to a specific tax. They equal your gross pay minus pre-tax deductions like health insurance and 401(k), plus any taxable items not paid in cash, such as group-term life insurance. Because each tax has its own rules, you have several taxable-wage figures, not one.
Your pay stub shows gross earnings; your W-2 shows taxable wages after pre-tax deductions. In almost every case they should not match, and that is correct. Pre-tax health insurance, FSA, HSA, and 401(k) contributions lower the wages reported on your W-2 below your gross pay.
Because a traditional 401(k) reduces your federal taxable wages (Box 1) but not your Social Security and Medicare wages (Boxes 3 and 5). Section 125 benefits like health insurance reduce all three. So if you contribute to a 401(k), Box 1 will be lower than Boxes 3 and 5.
Some states tax things the federal government does not. Pennsylvania, for example, taxes 401(k) contributions even though they are excluded from federal taxable wages, so a Pennsylvania worker's state wages in Box 16 are higher than their federal wages in Box 1. States like Ohio follow federal rules, so the two match.
Yes. If your employer provides group-term life insurance over $50,000, the taxable value of the excess is added to your wages as imputed income. This can push your taxable wages above your actual gross pay even though you never received the extra amount in cash.
No. A Roth 401(k) is funded with after-tax dollars, so it does not reduce any of your taxable-wage figures. Only a traditional 401(k) reduces your federal taxable wages. This is a common point of confusion.
Use Box 1 for your federal return and Box 16 for your state return. They do not need to match or add up. Your tax software will prompt you for each one separately.
California and New Jersey are the only two states that tax HSA contributions as state income, so HSA amounts appear in your Box 16 state wages in those states even though they are excluded from your federal Box 1. All other states with an income tax follow the federal rule and exempt HSA contributions.
If you work in a state with no income tax (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, or Wyoming), Box 16 and Box 17 may be blank because there is no state income tax to withhold. This is correct and not an error.