Why Is My W-2 Less Than My Salary? (2026)
Your W-2 Box 1 (taxable wages) is lower than your annual salary because pre-tax deductions reduce it. Every dollar you contribute to a traditional 401(k), pay for employer-sponsored health insurance, or put into an FSA comes out of your paycheck before taxes are calculated, so it never appears in Box 1.
Key Findings
- $90K salary with $12,350 of pre-tax deductions yields Box 1 of $77,650.
- Federal tax on Box 1 is typically lower than tax on gross salary.
- Roth contributions do not reduce Box 1 because they are taxed after payroll.
Example math
| Item | Amount |
|---|---|
| Gross salary | $90,000 |
| 401(k) contribution | $6,000 |
| Health insurance | $3,600 |
| FSA contribution | $2,750 |
| W-2 Box 1 wages | $77,650 |
| Federal tax at gross salary | $10,970 |
| Federal tax at Box 1 wages | $8,253 |
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See also: how to read your W-2 →
W-2 vs salary questions
Why is my W-2 Box 1 less than my salary?
Box 1 shows taxable wages, which are reduced by pre-tax deductions. Common deductions that lower Box 1 include traditional 401(k) contributions, health insurance premiums paid pre-tax through your employer, and FSA contributions.
What does not reduce Box 1?
Roth 401(k) contributions, after-tax benefits, and your filing-time standard deduction do not reduce Box 1. Box 1 is calculated from payroll deductions before tax withholding.
How do I estimate the W-2 vs salary gap?
Add up your pre-tax deductions and subtract them from gross salary. Then compare tax on gross pay versus taxable wages using the calculator above.
Does Box 3 also drop by the same amount?
No. Social Security wages in Box 3 usually remain closer to gross salary because 401(k) contributions do not reduce Social Security tax wages.
Should I care if Box 1 is lower than salary?
Usually yes, because it shows pre-tax benefits are reducing federal taxable income. It is a normal payroll result, not an error, unless the numbers do not match your pay stubs.
How does this affect my refund?
Lower Box 1 usually means lower federal withholding and potentially a smaller year-end tax bill. Compare Box 2 on your W-2 with your estimated annual tax to see whether you are likely over- or under-withheld.